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FI128325B - An air re-circulation system and a method for a dryer section of a board or paper machine - Google Patents

An air re-circulation system and a method for a dryer section of a board or paper machine Download PDF

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Publication number
FI128325B
FI128325B FI20185875A FI20185875A FI128325B FI 128325 B FI128325 B FI 128325B FI 20185875 A FI20185875 A FI 20185875A FI 20185875 A FI20185875 A FI 20185875A FI 128325 B FI128325 B FI 128325B
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FI
Finland
Prior art keywords
air
liquid
heat exchanger
moist exhaust
section
Prior art date
Application number
FI20185875A
Other languages
Finnish (fi)
Swedish (sv)
Other versions
FI20185875A1 (en
Inventor
Markus Hallapuro
Pasi Rajala
Original Assignee
Tm System Finland Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tm System Finland Oy filed Critical Tm System Finland Oy
Priority to FI20185875A priority Critical patent/FI128325B/en
Priority to CN201811239440.7A priority patent/CN111058329B/en
Priority to PCT/FI2019/050737 priority patent/WO2020079326A1/en
Application granted granted Critical
Publication of FI128325B publication Critical patent/FI128325B/en
Publication of FI20185875A1 publication Critical patent/FI20185875A1/en

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/20—Waste heat recovery
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

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Abstract

The invention relates to an air re-circulation system (1) and an air recirculation method for a dryer section of a board or paper machine (2). In the dryer section water from a moving web-like material (3) is evaporating to air creating moist exhaust air (4a-c) during a run of the board or paper machine. The system (1) comprises at least three air re-circulation parts (5a-c) connected to a dryer section hood (6) one after the other in a run direction (r) of a web-like material (3). Each air re-circulation part (5a-c) comprises one or more heat recovery units (7a-c). Each heat recovery unit (7a-c) comprises a circulation air fan (8a-c) for drawing moist exhaust air (4a-c) from the dryer section hood (6) through the heat recovery unit (7a-c) and for supplying at least part of the conditioned moist exhaust air (9ac) to the dryer section hood (6), and an air-to-fluid heat exchanger (11a-c) for conditioning the moist exhaust air (4a-c) by cooling and reducing a moisture content of the moist exhaust air (4a-c). The air-to-fluid heat exchanger (11a-c) comprises a fluid circuit (13a-c) connected to a fluid cooling unit (14), and a spraying unit (21a-c) in connection with the air-to-fluid heat exchanger (11a-c) for cleaning the moist exhaust air (4a-c). A first air re-circulation part (5a) is connected to a beginning of the dryer section hood (6), a second air re-circulation part (5b) is connected to a middle of the dryer section hood (6) and a third air re-circulation part (5c) is connected to an end of the dryer section hood (6).

Description

AN AIR RE-CIRCULATION SYSTEM AND A METHOD FOR A DRYER SECTION OF A BOARD OR PAPER MACHINE
FIELD OF THE INVENTION
The present invention relates to an air re-circulation system and a method for a dryer section of a board or paper machine, and more particularly to a dryer section where water from a moving web-like material is evaporating to air creating moist exhaust air during a run of the board or paper machine.
BACKGROUND OF THE INVENTION
Drying of a web-like material in a dryer section or sections of a board or paper machine is an energy intensive operation due to the high latent heat of vaporization. The water from a moving web-like material is evaporating to a surrounding hot air creating a moisture laden exhaust air.
It is known to recover heat from the moisture laden exhaust air. For instance, a fresh supply air can be pre-heated or heated with the moisture laden exhaust air. The cooled moisture laden exhaust air is then exhausted to atmosphere. As the cooled moisture laden exhaust air flow is exhausted to the atmosphere it causes emissions. In some areas even, exhausted plumes of a clean water vapour are unacceptable. The visible water vapour plumes can be of concern to the population living close to industrial plants. Further, plume induced fogging and icing rise accident risks and may be dangerous for crops and equipment.
Publications WO 0163044 Al, DE 4304244 Al and CN 101929095 A disclose relevant prior art relating to the present invention.
Thus, there is a need for an efficient and energy saving system and a 25 method for re-circulating air in a dryer section of a board or paper machine which also reduces the amount of the exhaust air flow exhausted to the atmosphere.
BRIEF DESCRIPTION OF THE INVENTION
An object of the present invention is to provide an air re-circulation system and a method for a dryer section of a board or paper machine so as to solve or at least alleviate the prior art disadvantages. The objects of the invention are achieved by an air re-circulation system which is characterized by what is stated in claim 1. The objects of the present invention are also achieved by an air recirculation method which is characterized by what is stated in claim 11.
20185875 prh 10 -09- 2019
The preferred embodiments of the invention are disclosed in the dependent claims.
The invention is based on the idea of an air re-circulation system for a dryer section of a board or paper machine. In the dryer section water from a 5 moving web-like material is evaporating to air creating moist exhaust air during a run of the board or paper machine. The system comprises at least three air recirculation parts connected to a dryer section hood one after the other in a run direction of a web-like material. Each air re-circulation part comprises one or more heat recovery units. Each heat recovery unit comprises a circulation air fan for 10 drawing moist exhaust air from the dryer section hood through the heat recovery unit and for supplying at least part of the conditioned moist exhaust air to the dryer section hood, and an air-to-fluid heat exchanger for conditioning the moist exhaust air by cooling and reducing a moisture content of the moist exhaust air. The air-tofluid heat exchanger comprises a fluid circuit connected to a fluid cooling unit, and 15 a spraying unit in connection with the air-to-fluid heat exchanger for cleaning the moist exhaust air. A first air re-circulation part is connected to a beginning of the dryer section hood, a second air re-circulation part is connected to a middle of the dryer section hood and a third air re-circulation part is connected to an end of the dryer section hood.
During a run of the board or paper machine, the dryer section hood comprises several zones in a run direction of the web-like material where the moisture contents of the exhaust air are at different levels. In the system and method, the dryer section hood comprises at least three zones. In the beginning of the dryer section hood is a zone where the moisture content of the exhaust air is 25 low as the web-like material in warming up. In the beginning of the dryer section hood the evaporating rate is typically 0-20 kg/m2h. In a middle of the dryer section hood is a zone where the moisture content of the exhaust air is high as the web-like material has a high evaporating rate. In the middle of the dryer section hood the evaporating rate is typically 20-40 kg/m2h. In the end of the dryer section hood is 30 a zone where the moisture content of the exhaust air is low again due to a decreased drying rate of the web-like material. In the end of the dryer section hood the evaporating rate is typically 20-0 kg/m2h. Thus, the beginning and the end of the dryer section hood comprise zones where the moisture content of the exhaust air is lower than in the zone in the middle of the dryer section hood. The zones are 35 preferably defined by an evaporating rate and may be separated by light weight walls, e.g. flaps. However, the zones need not to be separated from each other with
20185875 prh 10 -09- 2019 separation walls constructed to limit the movement of the moist exhaust air from one zone to another.
In the system and the method, the moist exhaust air which removes the water vapor evaporated from the web-like material out of the hood of the dryer 5 section in the dryer section is conditioned by cooling and drying and cleaning, and at least part of the conditioned moist exhaust air is re-circulated to the dryer section hood as a supply air.
With the system and the method, the zones having different moisture content levels inside the dryer section hood creating moist exhaust air at different 10 moisture content levels can be handled separately. Each zone may be provided with a supply air, conditioned moist exhaust air, having a temperature and moisture content independent of another zone. In the middle of the dryer section hood the temperature and humidity of the supplied air, the conditioned moist exhaust air, is preferably higher than in other zones.
As the air re-circulation in the heat recovery unit enables also a fully closed or largely closed air re-circulation system, only one circulation air fan needs to be provided for each heat recovery unit.
A dryer section hood is an enclosure surrounding the dryers in the drying section. The locations in the dryer section hood, e.g. in the beginning, in the 20 middle and in the end of the dryer section hood, are defined in the length direction of the dryer section hood in the run direction of the web-like material. The weblike material comprises a paper web, a board web or a fibre web, for instance. In the fluid circuits of the air-to-fluid heat exchangers and the second air-to-fluid heat exchangers flowing cooling fluid comprises a water-glycol mixture, for instance, or 25 a liquid having a low freezing point, e.g. below -15°C.
The fluid cooling unit may comprise a cooling tower and/or a thermally driven heat pump. The thermally driven heat pump utilizes the moist exhaust air having a higher temperature as a heat source and further, it may provide chilling to the moist exhaust air to have a lower temperature.
The fluid cooling unit may comprise an absorption chiller. The fluid circuit of the air-to-fluid heat exchanger of the second air re-circulation part which is connected to a middle of the dryer section hood is connected to one or more generators of the absorption chiller for driving the absorption chiller. The fluid circuit of the air-to-fluid heat exchanger of the first air re-circulation part and/or 35 the third air re-circulation part is connected to one or more evaporators of the absorption chiller.
20185875 prh 10 -09- 2019
The absorption chiller utilizes the moist exhaust air having a higher temperature as a heat source and provides chilling to the moist exhaust air to have a lower temperature. In the beginning and in the end of the dryer section hood the moisture content of the exhaust air is lower than in the zone in the middle of the 5 dryer section hood and by providing chilling to condition the moist exhaust air the moisture content of the conditioned moist air is further reduced. As the dryer section hood requires an amount of 55%...80% of the moist exhaust air flow supplied as a dry heated supply air part of the conditioned moist exhaust air is exhausted to atmosphere. The main part of the exhausted conditioned moist 10 exhaust air is preferably exhausted from the beginning and from the end of the dryer section hood. Therefore, the reduced moisture content of the conditioned moist air decreases the risk of visible water vapour plumes.
The fluid cooling unit may comprise a thermally driven heat pump, and the fluid circuit of the air-to-fluid heat exchanger of the second air re-circulation 15 part is connected to one or more generators of thermally driven heat pump for driving the thermally driven heat pump. The one or more evaporators of the thermally driven heat pump produces cooling power during the operation of the thermally driven heat pump. Further, the fluid circuit of the air-to-fluid heat exchanger of the first air re-circulation part and/or the third air re-circulation part 20 may be connected to one or more evaporators of the thermally driven heat pump. In this case the thermally drive heat pump produces cooling power to the air recirculation system. Furthermore, the one or more evaporators of the thermally driven heat pump may comprise an inlet connection and an outlet connection to a chilled water network of the paper or pulp production mill for providing chilled 25 water for process and building cooling purposes. In this case the thermally driven heat pump produces cooling power to the paper or pulp production mill comprising the air re-circulation system.
The fluid cooling unit may comprise a thermally driven heat pump and a cooling tower. The fluid circuit of the air-to-fluid heat exchanger of the heat 30 recovery unit of the second air re-circulation part is connected to the thermally driven heat pump for driving the thermally driven heat pump. The thermally driven heat pump is connected to a cooling fluid circuit of the cooling tower for releasing heat from the thermally driven heat pump to the cooling fluid. The heat gained from a hot and moist exhaust air drawn from the middle of the dryer section 35 hood where the web-like material has a high evaporating rate is utilized to drive a thermally driven heat pump.
20185875 prh 10 -09- 2019
The heat recovery unit may further comprise an air-to-air heat exchanger for heating from the air-to-fluid heat exchanger flowing conditioned moist exhaust air with the moist exhaust air and a spraying unit in connection with the air-to-air heat exchanger for cleaning the moist exhaust air, a heater for heating 5 the conditioned moist exhaust air flowing from the air-to-air heat exchanger prior to supplying at least part of the conditioned moist exhaust air to the dryer section hood.
The heat recovery unit may further comprise a heater for heating the conditioned moist exhaust air prior to supplying at least part of the conditioned 10 moist exhaust air to the dryer section hood and a second air-to-fluid heat exchanger comprising a second fluid circuit connected to a cooling fluid circuit of the thermally driven heat pump where the cooling fluid enters the thermally driven heat pump at a lower temperature than entering to the second air-to-fluid heat exchanger.
The second air re-circulation part connected to the middle of the dryer section hood may comprise two heat recovery units. The heat recovery unit further comprises an air-to-air heat exchanger for heating from the air-to-fluid heat exchanger flowing conditioned moist exhaust air with the moist exhaust air and a spraying unit in connection with the air-to-air heat exchanger for cleaning the 20 moist exhaust air, and a heater for heating the conditioned moist exhaust air flowing from the air-to-air heat exchanger prior to supplying at least part of the conditioned moist exhaust air to the dryer section hood. The fluid cooling unit may comprise a thermally driven heat pump, and the fluid circuits of the air-to-fluid heat exchangers of the two heat recovery units are connected to one or more 25 generators of the thermally driven heat pump for driving the thermally driven heat pump. Further, the fluid circuits of the air-to-fluid heat exchangers of the two heat recovery units may be connected in parallel to the fluid cooling unit.
During the run of the board or paper machine the dryer section hood may comprise at least three zones comprising exhaust air at different moisture 30 content levels inside the dryer section hood one after the other in a run direction of a web-like material.
The at least three zones are located to the beginning, to the middle and to the end of the dryer section hood. In the system the first air re-circulation part is arranged to re-circulate moist exhaust air from the zone located to the beginning, 35 the second air re-circulation part is arranged to re-circulate moist exhaust air from the zone located to the middle, and the third air re-circulation part is arranged to
20185875 prh 10 -09- 2019 re-circulate moist exhaust air from the zone located to the end.
The invention is based on the idea of an air re-circulation method for a dryer section of a board or paper machine and in the dryer section water from a moving web-like material is evaporating to air creating moist exhaust air during a 5 run of the board or paper machine. The method comprises at least three air recirculation parts connected to a dryer section hood one after the other in a run direction of a web-like material. Each air re-circulation part comprises one or more heat recovery units. Each heat recovery unit comprises a circulation air fan and an air-to-fluid heat exchanger. The circulation air fan is drawing moist exhaust air 10 from the dryer section hood through the heat recovery unit and is supplying at least part of the conditioned moist exhaust air to the dryer section hood. The air-to-fluid heat exchanger is conditioning the moist exhaust air by cooling and reducing a moisture content of the moist exhaust air. A fluid circuit of the air-to-fluid heat exchanger is connected to a fluid cooling unit, and the fluid in the fluid circuit of the 15 air-to-fluid heat exchanger is cooled in the fluid cooling unit. A spraying unit in connection with the air-to-fluid heat exchanger is cleaning the moist exhaust air. A first air re-circulation part is connected to a beginning of the dryer section hood and a first circulation air fan is drawing the moist exhaust air and is supplying at least part of the conditioned moist exhaust air to the beginning of the dryer section 20 hood. A second air re-circulation part is connected to a middle of the dryer section hood and a second circulation air fan is drawing the moist exhaust air and is supplying at least part of the conditioned moist exhaust air to the middle of the dryer section hood. A third air re-circulation part is connected to an end of the dryer section hood and a third circulation air fan is drawing the moist exhaust air 25 and is supplying at least part of the conditioned moist exhaust air to the end of the dryer section hood.
During the run of the board or paper machine the amount of water from a web-like material evaporating to air may be varied in a run direction of a weblike material in the dryer section hood. At least three zones creating exhaust air at 30 different moisture content levels is provided inside the dryer section hood one after the other in a run direction of a web-like material. The at least three zones are located to a beginning of the dryer section hood, to a middle of the dryer section hood and to an end of the dryer section hood. In the method the first air recirculation part is re-circulating moist exhaust air from the zone located to the 35 beginning, the second air re-circulation part is re-circulating moist exhaust air from the zone located to the middle and the third air re-circulation part is re
20185875 prh 10 -09- 2019 circulating moist exhaust air from the zone located to the end of the dryer section hood.
The fluid cooling unit may comprise a cooling tower. The fluid circuit of the air-to-fluid heat exchanger is connected to the cooling tower, and the fluid in 5 the fluid circuit is cooled in the cooling tower.
The fluid cooling unit may comprise a thermally driven heat pump. The fluid circuit of the air-to-fluid heat exchanger of the second air re-circulation part is connected to one or more generators of thermally driven heat pump, and the fluid in the fluid circuit of the air-to-fluid heat exchanger of the second air re10 circulation part is cooled in the thermally driven heat pump by driving the thermally driven heat pump.
The fluid cooling unit may comprise a thermally driven heat pump and a cooling tower. The fluid in the fluid circuit of the air-to-fluid heat exchanger of the heat recovery unit of the second air re-circulation part is flowing to the 15 thermally driven heat pump for driving the thermally driven heat pump. The cooling fluid in the cooling fluid circuit of the cooling tower is flowing to the thermally driven heat pump and the thermally driven heat pump is releasing heat to the cooling fluid.
Further, the heat recovery unit may further comprise a heater and a 20 second air-to-fluid heat exchanger comprising a second fluid circuit connected to a cooling fluid circuit of the thermally driven heat pump. The heater is heating the conditioned moist exhaust air prior at least part of it is supplied to the dryer section hood. The fluid in the second fluid circuit of a second air-to-fluid heat exchanger is cooling the conditioned moist exhaust air flowing from the air-to-fluid heat 25 exchanger in the second air-to-fluid heat exchanger, and the fluid in the second fluid circuit of a second air-to-fluid heat exchanger is entering the thermally driven heat pump at a lower temperature than entering to the second air-to-fluid heat exchanger.
The fluid cooling unit may comprise an absorption chiller. The fluid 30 circuit of the air-to-fluid heat exchanger of the second air re-circulation part is connected to one or more generators of the absorption chiller. The fluid in the fluid circuit of the air-to-fluid heat exchanger of the second air re-circulation part is cooled in one or more generators of the absorption chiller by driving the absorption chiller. The fluid circuit of the air-to-fluid heat exchanger of the first air 35 re-circulation part and/or the third air re-circulation part is connected to one or more evaporators of the absorption chiller. The fluid in the fluid circuit of the air8
20185875 prh 10 -09- 2019 to-fluid heat exchanger of the first air re-circulation part and/or the third air recirculation part is chilled in one or more evaporators of the absorption chiller.
The heat recovery unit may further comprise an air-to-air heat exchanger, a spraying unit in connection with the air-to-air heat exchanger and a 5 heater. The moist exhaust air drawn from the dryer section hood is heating the conditioned moist exhaust air flowing from the air-to-fluid heat exchanger in the air-to-air heat exchanger, and the spraying unit is cleaning the moist exhaust air by spraying washing liquid, and the heater is heating the conditioned moist exhaust air flowing from the air-to-air heat exchanger prior at least part of it is supplied to 10 the dryer section hood.
The fluid cooling unit may comprise a thermally driven heat pump, and the fluid circuit of the air-to-fluid heat exchanger of the second air re-circulation part is connected to one or more generators of the thermally driven heat pump. The fluid in the fluid circuit of the air-to-fluid heat exchanger of the second air re15 circulation part is cooled in one or more generators of the thermally driven heat pump by driving the thermally driven heat pump. The fluid circuit of the air-tofluid heat exchanger of the first air re-circulation part and/or the third air recirculation part is connected to one or more evaporators of the thermally driven heat pump. The fluid in the fluid circuit of the air-to-fluid heat exchanger of the first 20 air re-circulation part and/or the third air re-circulation part is chilled in one or more evaporators of the thermally driven heat pump.
The second air re-circulation part connected to the middle of the dryer section hood may comprise two heat recovery units. The heat recovery unit further comprises an air-to-air heat exchanger, a spraying unit in connection with the air25 to-air heat exchanger and a heater, and the moist exhaust air drawn from the dryer section hood is heating the conditioned moist exhaust air flowing from the air-tofluid heat exchanger in the air-to-air heat exchanger, and the spraying unit is cleaning the moist exhaust air by spraying washing liquid, and the heater is heating the conditioned moist exhaust air flowing from the air-to-air heat exchanger prior 30 at least part of it is supplied to the dryer section hood.
Further, the fluid cooling unit may comprise a thermally driven heat pump and the fluids in the fluid circuits of the air-to-fluid heat exchangers of the two heat recovery units are flowing to one or more generators of the thermally driven heat pump for driving the thermally driven heat pump.
The air re-circulation system and a method for a dryer section of a board or paper machine of the present invention provide an efficient and energy saving system and method and it reduces the amount of the exhaust air flow exhausted to the atmosphere.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is described in detail by means of specific embodiments with reference to the enclosed drawings, in which re-circulation
Figure 1 shows board or paper machine;
Figure 2 shows board or paper machine;
Figure 3 shows board or paper machine.
an an an air air air re-circulation re-circulation
DETAILED DESCRIPTION OF THE INVENTION system system system for for for dryer dryer dryer section section section of of of
20185875 prh 10 -09- 2019
Figures 1-3 show an air re-circulation system 1 for a dryer section of a board or paper machine 2. During a run of the board or paper machine water from a moving web-like material 3 is evaporating to air creating moist exhaust air 4a-c in the dryer section. The shown system comprises three air re-circulation parts 5ac connected to a dryer section hood 6 one after the other in a run direction r of a web-like material 3. The system may comprise four or more air re-circulation parts 5a-c. The shown air re-circulation part 5a-c comprise a heat recovery unit 7a-c. The air re-circulation part 5a-c may also comprise two or more heat recovery units 7ac arranged one after the other in a run direction r of a web-like material 3.
The heat recovery unit 7a-c comprises a circulation air fan 8a-c for drawing moist exhaust air 4a-c from the dryer section hood 6 into the heat recovery unit 7a-c. The circulation air fan 8a-c circulates the moist exhaust air 4ac through the heat recovery unit 7a-c and supplies at least part of the conditioned moist exhaust air 9a-c to the dryer section hood 6 as a supply air.
The heat recovery unit 7a-c further comprises an air-to-air heat exchanger lOa-c and an air-to-fluid heat exchanger lla-c. The circulation air fan 8a-c moves the moist exhaust air 4a-c through the air-to-air heat exchanger lOa-c where it is cooled as it transfers heat to the conditioned moist exhaust air flowing from the air-to-fluid heat exchanger lla-c. The heat recovery unit 7a-c comprises also a heater 12a-c for heating the conditioned moist exhaust air flowing from the air-to-air heat exchanger lOa-c prior to supplying at least part of the conditioned
20185875 prh 10 -09- 2019 moist exhaust air 9a-c to the dryer section hood 6 as a supply air.
In Figures 1-3 the circulation air fan 8a-c is located to precede the airto-air heat exchanger lOa-c in the flow direction of the moist exhaust air 4a-c in the heat recovery unit 7a-c. The circulation air fan 8a-c may also be located after the 5 air-to-air heat exchanger lOa-c in the flow direction of the moist exhaust air 4a-c in the heat recovery unit 7a-c. Further, the circulation air fan 8a-c may also be located after the heater lOa-c in the flow direction of the moist exhaust air 4a-c in the heat recovery unit 7a-c.
The moist exhaust air 4a-c is conditioned in the air-to-fluid heat 10 exchanger 1 la-c by cooling and reducing the moisture content of the moist exhaust air 4a-c. The air-to-fluid heat exchanger lla-c comprises a fluid circuit 13a-c connected to a fluid cooling unit 14. The fluid in the fluid circuit 13a-c of the airto-fluid heat exchanger is cooled in the fluid cooling unit 14.
In the embodiment of Figure 1 the fluid cooling unit 14 comprises a 15 cooling tower or an air cooled air-to-fluid heat exchanger, e.g. a lamella heat exchanger. The cooling tower may be a closed circuit evaporative cooling tower, for instance. A closed circuit, where the fluid in the fluid circuit 13a-c circulates within the flow channels inside the cooling tower, allows the fluid to maintain its chemical and physical characteristics and prevents the pollution of the fluid by 20 external particles. The flow channel is continuously wetted with a spray system wherein part of the spray water evaporates.
During a run of the board or paper machine, the dryer section hood 6 comprises several zones 15a-c one after the other in a run direction r of the weblike material 3 where the moisture contents of the exhaust air 4a-c are at different 25 levels. In Figures 1-3 the dryer section hood comprises three zones 15a-c. In the beginning of the dryer section hood 6 is a zone 15a where the moisture content of the exhaust air is low as the web-like material in warming up. In a middle of the dryer section hood 6 is a zone 15b where the moisture content of the exhaust air is high as the web-like material has a high evaporating rate. In the end of the dryer 30 section hood 6 is a zone 15c where the moisture content of the exhaust air is low again due to a decreased evaporating rate of the web-like material. Thus, the beginning and the end of the dryer section hood comprise zones 15a,c where the moisture content of the exhaust air is lower than in the zone 15b in the middle of the dryer section hood.
The moisture content of the moist exhaust air 4a-c is not constant within a zone 15a-c inside the dryer section hood 6. In the beginning of the dryer
20185875 prh 10 -09- 2019 section hood 6 the moisture content increases in the run direction of the web-like material r and in the end of the dryer section hood 6 the moisture content decreases in the run direction of the web-like material r. In the Figures the zones 15a-c are represented with dashed lines.
Each air re-circulation part 5a-c is located to be in connection with one zone 15a-c. A first air re-circulation part 5a is connected to a beginning of the dryer section hood 6, a second air re-circulation part 5b is connected to a middle of the dryer section hood 6 and a third air re-circulation part 5c is connected to an end of the dryer section hood 6.
The first air re-circulation part 5a is re-circulating moist exhaust air 4a from the zone 15a located to the beginning, the second air re-circulation part 5b is re-circulating moist exhaust air 4b from the zone 15b located to the middle and the third air re-circulation part 5c is re-circulating moist exhaust air 4c from the zone 15c located to the end of the dryer section hood 6.
In the embodiments shown in Figures 2 and 3 the fluid cooling unit 14 comprises a cooling tower and a thermally driven heat pump 16. Thermally driven heat pumps 16 work at several temperature levels. Driving heat is supplied at a high temperature level to one or more generators of the thermal heat pump 16. Useful cold in a cooling operation is supplied at a low temperature level from one 20 or more evaporators of the thermally driven heat pump 16. The supplied heat is released at a medium temperature level to a cooling fluid 17 flow of the thermally driven heat pump 16. Thermally driven heat pumps 16 enable utilization of lowgrade heat. Examples of thermally driven heat pumps 16 are absorption chillers and adsorption chillers. In the embodiments shown in Figures 2 and 3, the heat 25 gained from a hot and moist exhaust air 4b drawn from the middle of the dryer section hood 6 where the web-like material 3 has a high evaporating rate is utilized to drive a thermally driven heat pump 16.
In the embodiments shown in Figures 2 and 3 comprising the thermally driven heat pump 16 the air-to-air heat exchanger 10b in the heat recovery unit 7b 30 of the second air re-circulation part 5b may be omitted. In this case the moist exhaust air 4b can release more heat in the air-to-fluid heat exchanger lib for driving the heat pump 16.
In the embodiments shown in Figures 2 and 3 the thermally driven heat pump 16 comprises an absorption chiller, for instance. Then the fluid circuit 13b of 35 the air-to-fluid heat exchanger lib of the second air re-circulation part 5b is connected to one or more generators of the absorption chiller. The fluid in the fluid
20185875 prh 10 -09- 2019 circuit 13b of the air-to-fluid heat exchanger lib of the second air re-circulation part 5b is cooled in one or more generators of the absorption chiller by heating the work medium of the absorption chiller. As an example, the temperature of the fluid in the fluid circuit 13b of the air-to-fluid heat exchanger lib of the second air re5 circulation part 5b entering the thermally driven heat pump comprises 55-75°C.
The fluid circuit 13a of the air-to-fluid heat exchanger 1 la of the first air re-circulation part 5a and/or the third air re-circulation part 5c is connected to one or more evaporators of the thermally driven heat pump 16. The fluid in the fluid circuit 13a,c of the air-to-fluid heat exchanger 13a,c of the first air re-circulation 10 part 5a and the third air re-circulation part 5c is chilled in one or more evaporators of the thermally driven heat pump 16. As the one or more evaporators of the absorption chiller operate at a lower temperature that the one or more generators of the absorption chiller the temperature of the fluid entering to the air-to-fluid heat exchangers lla,c in the beginning and in the end of the dryer section hood 6 15 is lower than the temperature of the fluid entering to the air-to-fluid heat exchanger 1 lb in the middle of the dryer section hood 6. This enables the reduction of the moisture content of the conditioned moist exhaust air 9a-c to a lower level in the beginning and in the end of the dryer section hood 6 than in the middle of the dryer section hood 6. As an example, the temperature of the fluid in the fluid 20 circuit 13a,c of the air-to-fluid heat exchanger lla,c of the first and third air recirculation parts 5a,c entering the air-to-fluid heat exchanger lla,c comprises 1318°C.
In the embodiment shown in Figure 2 the cooling fluid 17 of the thermally driven heat pump 16 is cooled by means of a cooling tower. The cooling 25 fluid 17 flow flowing from the cooling tower enters the thermally driven heat pump 16, e.g. the absorption chiller, and to the thermally driven heat pump 16 supplied heat is released to the cooling fluid 17 flow. In the thermally driven heat pump 16 heated cooling fluid flow returns to the cooling tower. As an example, the temperature of the cooling fluid 17 entering the thermally driven heat pump 16 30 comprises 27-33°C.
In the embodiment shown in Figure 3 the heat recovery units 7a-c in the re-circulation parts 5a-c further comprise a second air-to-fluid heat exchanger 18a-c for conditioning the moist exhaust air 4a-c. The moist exhaust air 4a-c is conditioned in the second air-to-fluid heat exchanger 18a-c comprising a second 35 fluid circuit 19a-c connected to a cooling fluid 17 circuit of the thermally driven heat pump 16. The cooling fluid 17 of the thermally driven heat pump 16 is cooled
20185875 prh 10 -09- 2019 by means of a cooling tower. The cooling fluid 17 flow flowing from the cooling tower enters the thermally driven heat pump 16, e.g. the absorption chiller, and to the thermally driven heat pump 16 supplied heat is released to the cooling fluid 17 flow.
In the thermally driven heat pump 16 heated cooling fluid 17 flow is further divided into flow parts which flow to the second air-to-fluid heat exchangers 18a,c connected to the beginning and to the end of the dryer section hood 6. The moist exhaust air 4a,c releases heat to the cooling fluid 17 flow parts in the second air-to-fluid heat exchangers 18a,c. In the second air-to-fluid heat 10 exchangers 18a,c heated cooling fluid 17 flow parts flow to the second air-to-fluid heat exchanger 18b connected to the middle of the dryer section hood 6. The cooling fluid 17 flowing from the second air-to-fluid heat exchanger 18b connected to the middle of the dryer section hood 6 enters the cooling tower.
In the embodiment shown in Figure 3, the cooling fluid 17 flowing from the cooling tower enters the thermally driven heat pump 16 at a lower temperature than it enters to the second air-to-fluid heat exchangers 18a-c. In the flow direction of the cooling fluid 17 the second air-to-fluid heat exchangers located to the beginning and to the end of the drying section hood 6 precede the second air-tofluid heat exchanger located to the middle of the drying section hood. Thus, the 20 temperature of the cooling fluid 17 when it enters the second air-to-fluid heat exchanger 18b located to the middle of the drying section hood 6 comprises a higher temperature than when it enters the second air-to-fluid heat exchangers 18a,c located to the beginning and to the end of the drying section hood 6. As an example, the temperature of the cooling fluid 17 entering the thermally driven heat 25 pump 16 comprises 27-33°C and the temperature of the cooling fluid 17 entering the second air-to-fluid heat exchangers 18b connected to the beginning and to the end of the dryer section hood 6 comprises 33-39°C.
In the re-circulation part 5b connected to the middle of the dryer section hood 6, the air-to-fluid lib and the second air-to-fluid heat exchangers 18b 30 are arranged such that the air-to-fluid heat exchanger 1 lb precedes the second airto-fluid heat exchanger 18b in the flow direction of the moist exhaust air in the heat recovery unit 7b.
In the re-circulation parts 5a,c connected to the beginning and to the end of the dryer section hood 6, the air-to-fluid lla,c and the second air-to-fluid 35 18a,c heat exchangers are arranged such that the second air-to-fluid heat exchanger 18a,c precedes the air-to-fluid heat exchanger 11a,c in the flow direction
20185875 prh 10 -09- 2019 of the moist exhaust air 4a,c in the heat recovery unit 7a,c.
In the embodiment shown in Figure 3 the fluid cooling unit 14 arranged to provide fluid cooling to the air-to-fluid lla-c and to the second air-to-fluid heat exchangers 18a-c comprises a thermally driven heat pump 16 and a cooling tower.
The thermally driven heat pump 16 provides cooling to the air-to-fluid heat exchangers lla-c and the cooling tower provides cooling to the second air-to-fluid heat exchangers 18a-c. The cooling tower provides cooling also to the thermally driven heat pump 16.
At certain times of the year the outdoor air temperature can be high 10 enough allowing the conditioned moist exhaust air 9a-c from the beginning and from the end of the dryer section hood 6 to be exhausted to the atmosphere without a risk of creating visible plumes. Then the system 1 shown in Figure 3 comprises one or more valves closing the fluid circuit 13a,c of the air-to-fluid heat exchanger 13a,c of the first air re-circulation part 5a and the third air re-circulation part 5c. 15 The system 1 also comprises by-pass channels to by-pass the air-to-fluid heat exchanger 13a,c of the first air re-circulation part 5a and the third air re-circulation part 5c. Additionally, the system 1 comprises an inlet connection to and an outlet connection from the thermally driven heat pump which can be used to provide chilled water to a chilled water network of the paper or pulp production mill for 20 cooling purposes.
In all embodiments each air recirculation part 5a-c comprises at least one washing system 20 which is a continuous washing system comprising a washing liquid tank and a washing liquid pump. The air-to-air heat exchanger 10ac, the air-to-fluid heat exchanger lla-c and the second air-to-fluid heat exchanger 25 18a-c comprise a spraying unit 21a-c for cleaning the moist exhaust air 4a-c. In the
Figures the washing liquid inlets to the spraying units 21a-c and the washing liquid outlets from the heat exchangers lOa-c, lla-c, 18a-c are shown by arrows and the connection to the washing system 20 is shown only for one heat exchanger 10b in one heat recovery unit 5b. The reference numbers for the spraying units 21a-c are 30 marked only to Figure 1 for a sake of clarity. The continuous washing of the moist exhaust air 4a-c is preferably made in one of the heat exchangers lOa-c, lla-c, 18ac in each recovery unit 7a-c and a periodical washing of the moist exhaust air 4a-c is made in the other heat exchangers lOa-c, lla-c, 18a-c. The washing of the moist exhaust air 4a-c in the re-circulation part 5a-c is necessary in order to meet the 35 quality requirements set to the supply air.
The embodiments shown in Figures 1-3 may comprise two heat
20185875 prh 10 -09- 2019 recovery units 7a-c in the second air re-circulation part 5b connected to the middle of the dryer section hood 6 and arranged one after each other in the run direction r of the web-like material 3. The fluid circuits of the air-to-fluid heat exchangers of the two heat recovery units are then connected in parallel to the fluid cooling unit.
Usually modern dryer section hoods 6 require an amount of 55%...80% of the moist exhaust air 4a-c flow supplied as a dry heated replacement air. The remainder is supplied by infiltration around the hood seals and doors to prevent hot moist air from escaping into the machine room. In an embodiment, the first circulation air fan 8a connected to a beginning of the dryer section hood 6 is 10 supplying at least 60% of the volume of the conditioned moist exhaust air 9a, and the second circulation air fan 8b connected to the middle of the dryer section hood 6 is supplying at least 90% of the volume of the conditioned moist exhaust air 9b and the third circulation air fan 8c connected to the end of the dryer section hood 6 is supplying at least 60% of the volume of the conditioned moist exhaust air 9c 15 to the dryer section hood 6 as a supply air.
The invention has been described above with reference to the examples shown in the figures. However, the invention is in no way restricted to the above examples but may vary within the scope of the claims.
Part list: 1 an air re-circulation system; 2 a dryer section of a board or 20 paper machine; 3 a web-like material; 4a-c moist exhaust air; 5a-c an air recirculation part; 6 a dryer section hood; 7a-c a heat recovery unit; 8a-c a circulation air fan; 9a-c conditioned moist exhaust air; lOa-c an air-to-air heat exchanger; 11ac an air-to-fluid heat exchanger; 12a-c a heater; 13a-c a fluid circuit; 14 a fluid cooling unit; 15a-c a zone; 16 a heat pump; 17 a cooling fluid; 18 a-c a second air25 to-fluid heat exchanger; 19a-c a second fluid circuit; 20 a washing system; 21a-c a spraying unit; r run direction.

Claims (20)

1. Kartonki- tai paperikoneen kuivausosan ilmankierrätysjärjestelmä1. Cardboard or paper machine dryer section air recirculation system 2. Patenttivaatimuksen 1 mukainen ilmankierrätysjärjestelmä, tunnettu siitä, että nesteen jäähdytysyksikkö (14) käsittää jäähdytystornin ja/tai termisestiAir recirculation system according to claim 1, characterized in that the liquid cooling unit (14) comprises a cooling tower and / or a thermally 25 ohjatun lämpöpumpun (16).25 controlled heat pumps (16). 3. Patenttivaatimuksen 1 tai 2 mukainen ilmankierrätysjärjestelmä, tunnettu siitä, että nesteen jäähdytysyksikkö (14) käsittää termisesti ohjatun lämpöpumpun (16), joka käsittää adsorptiojäähdyttimen, ja kuivausosan kuvun (6)Air recirculation system according to claim 1 or 2, characterized in that the liquid cooling unit (14) comprises a thermally controlled heat pump (16) comprising an adsorption cooler and a dome (6) of the drying section. 30 keskelle liitetyn toisen ilman kierrätysosan (5b) ilma/neste lämmönvaihtimen (11b) nestepiiri (13b) on liitetty yhteen tai useampaan adsorptiojäähdyttimen generaattoriin adsorptiojäähdyttimen ohjaamiseksi, ja ensimmäisen ilmankierrätysosan (5a) ja/tai kolmannen ilmankierrätysosan (5c) ilma/neste lämmönvaihtimen (lla,c) nestepiiri (13a,c) on liitetty yhteen tai useampaan 35 adsorptiojäähdyttimen haihduttimeen.The fluid circuit (13b) of the air / liquid heat exchanger (11b) of the second air recirculation section (5b) connected to the center is connected to one or more adsorption cooler generators for controlling the adsorption condenser, and the first air recirculation section (5a) and / or the third air recirculation section (5c) , c) the liquid circuit (13a, c) is connected to one or more evaporators of the adsorption condenser 35. 20185875 prh 10 -09- 201920185875 prh 10 -09- 2019 4. Patenttivaatimuksen 1 mukainen ilmankierrätysjärjestelmä, tunnettu siitä, että nesteen jäähdytysyksikkö (14) käsittää termisesti ohjatun lämpöpumpun (16), ja toisen ilmankierrätysosan (5b) ilma/neste lämmönvaihtimen (11b) nestepiiri (13b) on liitetty yhteen tai useampaan termisesti ohjatun lämpöpumpun 5 (16) generaattoriin termisesti ohjatun lämpöpumpun (16) ohjaamiseksi, ja ensimmäisen ilmankierrätysosan (5a) ilma/neste lämmönvaihtimen (lla,c) nestepiiri (13a,c) on liitetty yhteen tai useampaan termisesti ohjatun lämpöpumpun (16) haihduttimeen.Air recirculation system according to claim 1, characterized in that the liquid cooling unit (14) comprises a thermally controlled heat pump (16) and the liquid circuit (13b) of the air / liquid heat exchanger (11b) of the second air recirculation part (5b) is connected to one or more thermally controlled heat pumps 5 (16) to the generator for controlling the thermally controlled heat pump (16), and the liquid circuit (13a, c) of the air / liquid heat exchanger (11a, c) of the first air recirculation section (5a) is connected to one or more evaporators of the thermally controlled heat pump (16). 5 (7a-c), lämmöntalteenottoyksikkö (7a-c) edelleen käsittää ilma/ilma lämmönvaihtimen (lOa-c) ilma/neste lämmönvaihtimelta (lla-c) virtaavan käsitellyn kostean poistoilman (9a-c) lämmittämiseksi kostealla poistoilmalla (4ac) ja ilma/ilma lämmönvaihtimeen (lOa-c) liittyvän suihkutusyksikön (21a-c) kostean poistoilman (4a-c) puhdistamiseksi, lämmittimen (12a-c) ilma/ilma 10 lämmönvaihtimelta (lOa-c) virtaavan käsitellyn kostean poistoilman (9a-c) lämmittämiseksi ennen vähintään osan käsitellyn kostean poistoilman (9a-c) johtamista kuivausosan kupuun (6).5 (7a-c), the heat recovery unit (7a-c) further comprises an air / air heat exchanger (10a-c) for heating the treated moist exhaust air (9a-c) flowing from the air / liquid exchanger (11a-c) with moist exhaust air (4ac) and air / air to clean the moist exhaust air (4a-c) of the spray unit (21a-c) connected to the heat exchanger (10a-c), air / air of the heater (12a-c) to heat the treated moist exhaust air (9a-c) flowing from the heat exchanger (10a-c) before introducing at least a portion of the treated moist exhaust air (9a-c) into the dome (6) of the drying section. 5 (1), jossa kuivausosassa (2) liikkuvassa rainamaisessa materiaalissa (3) oleva vesi haihtuu ilmaan luoden kostean poistoilman (4a-c) kartonki- tai paperikoneen käynnin aikana, tunnettu siitä, että järjestelmä käsittää vähintään kolme kuivausosan kupuun (6) liitettyä ilmankierrätysosaa (5a-c) peräkkäin rainamaisen materiaalin kulkusuunnassa (r), jokainen ilmankierrätysosa (5a-c) käsittää yhden 10 tai useamman lämmöntalteenottoyksikön (7a-c), jokainen lämmöntalteenottoyksikkö (7a-c) käsittää kiertoilmapuhaltimen (8a-c) kostean poistoilman (4a-c) imemiseksi kuivausosa kuvusta (6) lämmöntalteenottoyksikön (7a-c) läpi ja ainakin osan käsitellyn kostean poistoilman (9a-c) johtamiseksi kuivausoan kupuun (6) ja ilma/neste lämmönvaihtimen (lla-c) kostean 15 poistoilman (4a-c) käsittelemiseksi jäähdyttämällä ja kosteuspitoisuutta laskemalla, ilma/neste lämmönvaihdin (lla-c) käsittää jäähdytysyksikköön (14) liitetyn nestepiirin (13a-c), ja kostean poistoilman puhdistamista (4a-c) varten ilma/neste lämmönvaihtimeen (lla-c) liittyvän suihkutusyksikön (21a-c), ja ensimmäinen ilmankierrätysosa (5a) on liitetty kuivausosan kuvun (6) alkupäähän, 20 toinen ilmankierrätysosa (5b) on liitetty kuivausosan (6) keskelle ja kolmas ilmankierrätysosa (5c) on liitetty ilman kuivausosan kuvun (6) loppupäähän.5 (1), in which the water in the moving web-like material (3) in the drying section (2) evaporates into the air, creating moist exhaust air (4a-c) during operation of the board or paper machine, characterized in that the system comprises at least three air recirculation sections connected to the drying section hood (6) (5a-c) in succession in the direction of travel (r) of the web-like material, each air recirculation section (5a-c) comprises one or more heat recovery units (7a-c), each heat recovery unit (7a-c) comprises a moist exhaust air (4a) of a circulating air fan (8a-c) -c) to suction the drying section from the hood (6) through the heat recovery unit (7a-c) and to supply at least a part of the treated moist exhaust air (9a-c) to the drying section dome (6) and the moist exhaust air (4a-c) of the air / liquid heat exchanger (11a-c) ) by cooling and lowering the moisture content, the air / liquid heat exchanger (11a-c) comprises a liquid circuit (13a-c) connected to the cooling unit (14), and the moisture for purifying the exhaust air (4a-c), a spray unit (21a-c) connected to the air / liquid heat exchanger (11a-c), and a first air recirculation section (5a) is connected to the beginning of the dryer section dome (6), a second air recirculation section (5b) is connected to a drying section (6) in the middle and a third air recirculation section (5c) is connected to the end of the dome (6) of the air drying section. 6. Minkä tahansa patenttivaatimuksen 1-5 mukainenAccording to any one of claims 1 to 5 20 ilmankierrätysjärjestelmä, tunnettu siitä, että lämmöntalteenottoyksikkö (7a-c) edelleen käsittää ilma/ilma lämmönvaihtimen (lOa-c) ilma/neste lämmönvaihtimesta (lla-c) virtaavan käsitellyn kostean poistoilman (9a-c) lämmittämiseksi kostealla poistoilmalla (4a-c) ja ilma/ilma lämmönvaihtimeen (lOa-c) liittyvän suihkutusyksikön (21a-c) kostean poistoilman (4a-c) 25 puhdistamiseksi, lämmittimen (12a-c) ilma/ilma lämmönvaihtimesta (lOa-c) virtaavan käsitellyn kostean poistoilman (9a-c) lämmittämiseksi ennen vähintään osan käsitellyn kostean poistoilman (9a-c) johtamista kuivausosan kupuun (6).20 air recirculation system, characterized in that the heat recovery unit (7a-c) further comprises an air / air heat exchanger (10a-c) for heating the treated moist exhaust air (9a-c) flowing from the air / heat exchanger (11a-c) with moist exhaust air (4a-c) and an air / air for cleaning the moist exhaust air (4a-c) of the spray unit (21a-c) associated with the heat exchanger (10a-c), the air / air of the heated air exhaust air (9a-c) flowing from the air exchanger (10a-c) of the heater (12a-c) ) before passing at least a portion of the treated moist exhaust air (9a-c) to the dome of the drying section (6). 7. Minkä tahansa patenttivaatimuksen 2-6 mukainenAccording to any one of claims 2 to 6 30 ilmankierrätysjärjestelmä, tunnettu siitä, että lämmöntalteenottoyksikkö (7a-c) edelleen käsittää lämmittimen (12a-c) käsitellyn kostean poistoilman (9a-c) lämmittämiseksi ennen vähintään osan käsitellyn kostean poistoilman (9a-c) johtamista kuivausosan kupuun (6), toisen ilma/neste lämmönvaihtimen (18a-c), joka käsittää termisesti ohjatun lämpöpumpun (16) jäähdytysneste (17) piiriin 35 liitetyn toisen nestepiirin (19a-c), jossa jäähdytysneste (17) menee termisesti ohjattuun lämpöpumppuun (16) alemmassa lämpötilassa kuin mennessään toiseen ilma/neste lämmönvaihtimeen (18a-c).30 air recirculation system, characterized in that the heat recovery unit (7a-c) further comprises a heater (12a-c) for heating the treated moist exhaust air (9a-c) before passing at least a part of the treated moist exhaust air (9a-c) to the drying section dome (6); / liquid heat exchanger (18a-c) comprising a second liquid circuit (19a-c) connected to the coolant circuit (17) of the thermally controlled heat pump (16), wherein the coolant (17) enters the thermally controlled heat pump (16) at a lower temperature than when entering the second air / liquid to the heat exchanger (18a-c). 20185875 prh 10 -09- 201920185875 prh 10 -09- 2019 8. Minkä tahansa patenttivaatimuksen 1-6 mukainen ilmankierrätysjärjestelmä, tunnettu siitä, että kuivausosan kuvun (6) keskelle liittyvä toinen ilmankierrätysosa (5b) käsittää kaksi lämmöntalteenottoyksikköäAir recirculation system according to any one of claims 1 to 6, characterized in that the second air recirculation part (5b) connected to the center of the dome (6) of the drying section comprises two heat recovery units 9. Patenttivaatimuksen 8 mukainen ilmankierrätysjärjestelmä, tunnettu 15 siitä, että nesteen jäähdytysyksikkö (14) käsittää termisesti ohjatun lämpöpumpun (16), ja kahden lämmöntalteenottoyksikön (7a-c) ilma/neste lämmönvaihtimien (lla-c) nestepiirit (13a-c) liittyvät yhteen tai useampaan termisesti ohjatun lämpöpumpun (16) generaattoriin termisesti ohjatun lämpöpumpun (16) ohjaamiseksi.Air recirculation system according to claim 8, characterized in that the liquid cooling unit (14) comprises a thermally controlled heat pump (16), and the liquid circuits (13a-c) of the air / liquid heat exchangers (11a-c) of the two heat recovery units (7a-c) are connected together or to a plurality of thermally controlled heat pump (16) generators for controlling the thermally controlled heat pump (16). 10. Minkä tahansa patenttivaatimuksen 1-9 mukainen ilman kierrätysjärjestelmä, tunnettu siitä, että kartonki- tai paperikoneen käydessä kuivausosan kupu (6) käsittää vähintään kolme aluetta (15a-c), jotka käsittävät eri poistoilmaa (4a-c) eri kosteuspitoisuus alueilla kuivausosan kuvun (6) sisälläAir recirculation system according to any one of claims 1 to 9, characterized in that when the cardboard or paper machine is running, the dome (6) of the drying section comprises at least three areas (15a-c) comprising different exhaust air (4a-c) in different humidity areas (6) inside 25 peräkkäin rainamaisen materiaalin (3) kulkusuunnassa ( r ), ja ainakin kolme aluetta (15a-c) sijaitsevat kuivausosan kuvun (6) alkupäässä, keskellä sekä loppupäässä, ja järjestelmässä (1) ensimmäinen ilmankierrätysosa (5a) on järjestetty kierrättämään alussa sijaitsevan alueen (15a) kostea poistoilma (4a), toinen ilmankierrätysosa (5b) on järjestetty kierrättämään keskellä sijaitsevan 30 alueen (15b) kostea poistoilma (4b), ja kolmas ilmankierrätysosa (5c) on järjestetty kierrättämään kuivausosan kuvun (6) loppupäässä sijaitsevan alueen (15c) kostea poistoilma (4c).25 in succession in the direction of travel (r) of the web-like material (3), and at least three regions (15a-c) are located at the beginning, middle and end of the dome (6) of the drying section, and in the system (1) the first air recirculation section (5a) is arranged to recycle 15a) moist exhaust air (4a), a second air recirculation section (5b) is arranged to recirculate the moist exhaust air (4b) of the central area (15b), and a third air recirculation section (5c) is arranged to recirculate the moist area (15c) at the end of the dome (6). exhaust air (4c). 10 5. Minkä tahansa patenttivaatimuksen 1-4 mukainen ilmankierrätysjärjestelmä, tunnettu siitä, että nesteen jäähdytysyksikkö (14) käsittää termisesti ohjatun lämpöpumpun (16) ja jäähdytystornin, ja toisen ilman kierrätysosan (5b) lämmöntalteenottoyksikön (7b) ilma/neste lämmönvaihtimen (11b) nestepiiri (13b) liittyy termisesti ohjattuun lämpöpumppuun (16) termisesti 15 ohjatun lämpöpumpun (16) ohjaamiseksi, ja termisesti ohjattu lämpöpumppu (16) liittyy jäähdytystornin jäähdytysneste (17) piiriin lämmön vapauttamiseksi termisesti ohjatusta lämpöpumpusta (16) jäähdytysnesteeseen (17).Air recirculation system according to any one of claims 1 to 4, characterized in that the liquid cooling unit (14) comprises a thermally controlled heat pump (16) and a cooling tower, and the air circuit of the air / liquid heat exchanger (11b) of the second air recirculation part (5b) (13b) is associated with a thermally controlled heat pump (16) for controlling the thermally controlled heat pump (16), and the thermally controlled heat pump (16) is connected to the cooling tower coolant (17) circuit to release heat from the thermally controlled heat pump (16) to the coolant (17). 11. Ilmankierrätysmenetelmä kartonki- tai paperikoneen kuivausosaan11. Method of air recirculation to the drying section of a board or paper machine 35 (2), kartonki- tai paperikoneen käydessä kuivausosassa (2) liikkuvassa rainamaisessa materiaalissa (3) vesi haihtuu ilmaan luoden kostean poistoilman (4a-c), tunnettu siitä, että menetelmä käsittää peräkkäin vähintään kolme35 (2), when the paperboard or paper machine is running in the drying section (2) in the moving web-like material (3), the water evaporates into the air, creating a moist exhaust air (4a-c), characterized in that the method comprises at least three 20185875 prh 10 -09- 2019 rainamaisen materiaalin (3) kulkusuunnassa ( r) kuivausosan kupuun (6) liittyvää ilmankierrätysosaa (5a-c), jokainen ilmankierrätysosa (5a-c) käsittää yhden tai useamman lämmöntalteenottoyksikön (7a-c), jokainen lämmöntalteenottoyksikkö (7a-c) käsittää kiertoilmapuhaltimen (8a-c) ja ilma/lämpö lämmönvaihtimen (11a5 c), kiertoilmapuhallin (8a-c) imee kostean poistoilman (4a-c) kuivausosan kuvusta (6) lämmöntalteenottoyksikön (7a-c) kautta ja johtaa ainakin osan käsitellystä kosteasta poistoilmasta (9a-c) kuivausosan kupuun (6) ja ilma/neste lämmönvaihdin (lla-c) käsittelee kostean poistoilman (4a-c) jäähdyttämällä ja vähentämällä kostean poistoilman (4a-c) kosteuspitoisuutta, ilma/neste 10 lämmönvaihtimen (lla-c) nestepiiri (13a-c) liittyy nesteen jäähdytysyksikköön (14), ilma/neste lämmönvaihtimen (lla-c) nestepiirin (13a-c) neste jäähdytetään nesteen jäähdytys yksikössä (14), ilma/neste lämmönvaihtimeen (lla-c) liittyvä suihkutusyksikkö (21a-c) puhdistaa kostean poistoilman (4a-c), ja ensimmäinen ilman kierrätysosa (5a) liittyy kuivausosan kuvun (6) alkupäähän ja ensimmäinen 15 kiertoilmapuhallin (8a) imee kostean poistoilman (4a) ja johtaa vähintään osan käsitellystä kosteasta poistoilmasta (9a) kuivausosan kuvun (6) alkupäähän, toinen ilmankierrätysosa (5b) liittyy kuivausosan kuvun (6) keskelle ja toinen kiertoilmapuhallin (8b) imee kostean poistoilman (4b) ja johtaa vähintään osan käsitellystä kosteasta poistoilmasta (9b) keskelle kuivausosan kupua (6) ja kolmas 20 kiertoilma osa (5c) liittyy kuivausosan kuvun (6) loppupäähän ja kolmas kiertoilmapuhallin imee kostean poistoilman (4c) ja johtaa vähintään osan käsitellystä kosteasta poistoilmasta (9c) kuivausosan kuvun (6) loppupäähän.20185875 prh 10 -09- 2019 in the direction of travel (r) of the web-like material (3), an air recirculation section (5a-c) associated with the dome (6) of the drying section, each air recirculation section (5a-c) comprising one or more heat recovery units (7a-c), each heat recovery unit 7a-c) comprises a recirculating air blower (8a-c) and an air / heat heat exchanger (11a5 c), the recirculating air blower (8a-c) sucks the drying part of the moist exhaust air (4a-c) from the hood (6) through the heat recovery unit (7a-c) and conducts at least part of the treated moist exhaust air (9a-c) in the dome (6) of the drying section and the air / liquid heat exchanger (11a-c) treats the moist exhaust air (4a-c) by cooling and reducing the moisture content of the moist exhaust air (4a-c), the air / liquid 10 heat exchanger ( 11a-c) the liquid circuit (13a-c) is connected to the liquid cooling unit (14), the liquid of the liquid circuit (13a-c) of the air / liquid heat exchanger (11a-c) is cooled in the liquid cooling unit (14), the air / liquid heat exchanger ( 11a-c) cleans the moist exhaust air (4a-c), and the first air recirculation section (5a) is connected to the beginning of the dryer section hood (6) and the first recirculating air fan (8a) sucks the moist exhaust air (4a) and conducts at least a portion of the treated moist exhaust air (9a) at the beginning of the dryer section dome (6), a second air recirculation section (5b) joins the center of the dryer section dome (6) and a second recirculation fan (8b) sucks the moist exhaust air (4b) and directs at least a portion of the treated moist exhaust air (9b) the hood (6) and the third recirculating air part (5c) are connected to the end of the drying section hood (6) and the third recirculating air fan sucks the moist exhaust air (4c) and conducts at least a part of the treated moist exhaust air (9c) to the drying section hood (6). 12. Patenttivaatimuksen 11 mukainen ilmankierrätysmenetelmä,An air recirculation method according to claim 11, 25 tunnettu siitä, että nesteen jäähdytysyksikkö (14) käsittää jäähdytystornin tai termisesti ohjatun lämpöpumpun (16), ja ilma/neste lämmönvaihtimen (lla-c) nestepiiri (13a-c) liittyy jäähdytystorniin tai toisen ilmankierrätysosan (5b) ilma/neste lämmönvaihtimen (11b) nestepiiri (13b) liittyy termisesti ohjatun lämpöpumpun (16) yhteen tai useampaan generaattoriin, ja nestepiirin (13a-c) 30 neste jäähdytetään jäähdytystornissa, tai ilma/neste lämmönvaihtimen (lla-c) nestepiiri (13a-c) liittyy jäähdytystorniin tai toisen ilmankierrätysosan (5b) ilma/neste lämmönvaihtimen (11b) nestepiirin (13b) neste jäähdytetään termisesti ohjatussa lämpöpumpussa (16) käyttämällä termisesti ohjattavaa lämpöpumppua (16).25 characterized in that the liquid cooling unit (14) comprises a cooling tower or a thermally controlled heat pump (16), and the liquid circuit (13a-c) of the air / liquid heat exchanger (11a-c) is connected to the cooling tower or the air / liquid heat exchanger (11b) of the second air recirculation part (5b). ) the fluid circuit (13b) is connected to one or more generators of the thermally controlled heat pump (16), and the fluid of the fluid circuit (13a-c) is cooled in a cooling tower, or the fluid circuit (13a-c) of the air / liquid heat exchanger (11a-c) is connected to a cooling tower or another air recirculation section. (5b) The liquid of the liquid circuit (13b) of the air / liquid heat exchanger (11b) is cooled in a thermally controlled heat pump (16) using a thermally controlled heat pump (16). 13. Patenttivaatimuksen 11 tai 12 mukainen ilmankierrätysmenetelmä, tunnettu siitä, että nesteen jäähdytysyksikkö (14) käsittää termisesti ohjatunAir recirculation method according to claim 11 or 12, characterized in that the liquid cooling unit (14) comprises a thermally controlled 20185875 prh 10 -09- 2019 lämpöpumpun, joka käsittää adsorptiojäähdyttimen ja toisen ilmankierrätysosan (5b) ilma/neste lämmönvaihtimen (11b) nestepiiri (13b) liittyy yhteen tai useampaan adsorptiojäähdyttimen generaattoriin, ja toisen ilmankierrätysosan (5b) ilma/neste lämmönvaihtimen (11b) nestepiirin (13b) neste jäähdytetään 5 yhdessä tai useammassa adsorptiojäähdyttimen generaattorissa ohjaamalla adsorptiojäähdytintä, ja ensimmäisen ilmankierrätysosan (5a) ja/tai kolmannen ilmankierrätysosan (5c) ilma/neste lämmönvaihtimen (lla-c) nestepiiri (13a-c) liittyy yhteen tai useampaan adsorptiojäähdyttimen haihduttimeen, ja ensimmäisen ilmankierrätysosan (5a) ja/tai kolmannen ilmankierrätysosan (5c) ilma/neste 10 lämmönvaihtimen (lla,c) nestepiirin (13a,c) neste jäähdytetään yhdessä tai useammassa adsorptiojäähdyttimen haihduttimessa.20185875 prh 10 -09- 2019 the fluid circuit (13b) of the air / liquid heat exchanger (11b) of the heat pump comprising the adsorption cooler and the second air recirculation section (5b) is connected to one or more adsorbent cooler generators and the air / n of the second air recirculation section (5b) (13b) the liquid is cooled in one or more adsorption cooler generators by controlling the adsorption cooler, and the liquid circuit (13a-c) of the air / liquid heat exchanger (11a-c) of the first air recirculation section (5a) and / or the third air recirculation section (5c) is connected to one or more adsorbers and the air / liquid of the liquid circuit (13a, c) of the heat exchanger (11a, c) of the first air recirculation section (5a) and / or the third air recirculation section (5c) is cooled in one or more evaporators of the adsorption cooler. 14. Patenttivaatimuksen 11 mukainen ilmankierrätysmenetelmä tunnettu siitä, että nesteen jäähdytysyksikkö (14) käsittää termisesti ohjatunAn air recirculation method according to claim 11, characterized in that the liquid cooling unit (14) comprises a thermally controlled 15 toisen nestepiirin (19a-c), lämmitin (12a-c) lämmittää kostean poistoilman (9a-c) ennen kun vähintään osa siitä johdetaan kuivausosan kupuun (6), ja toisen ilma/neste lämmönvaihtimen (18a-c) toisessa nestepiirissä (19a-c) oleva neste jäähdyttää käsitellyn kostean poistoilman (9a-c), joka virtaa ilma/neste lämmönvaihtimelta (lla-c), toisessa ilma/neste lämmönvaihtimessa (18a-c), ja 20 toisen ilma/neste lämmönvaihtimen (18a-c) nestepiirissä (19a-c) oleva neste menee termisesti ohjattuun lämpöpumppuun (16) alemmassa lämpötilassa kun mennessään toiseen ilma/neste lämmönvaihtimeen (18a-c).15 the second liquid circuit (19a-c), the heater (12a-c) heats the moist exhaust air (9a-c) before at least a part of it is led to the dome (6) of the drying section, and the second air / liquid heat exchanger (18a-c) in the second liquid circuit (19a) -c) cools the treated moist exhaust air (9a-c) flowing from the air / liquid heat exchanger (11a-c), in the second air / liquid heat exchanger (18a-c), and in the second air / liquid heat exchanger (18a-c) the liquid in the liquid circuit (19a-c) goes to the thermally controlled heat pump (16) at a lower temperature when going to the second air / liquid heat exchanger (18a-c). 15. Patenttivaatimuksen 11 tai 14 mukainen ilmankierrätysmenetelmä, tunnettu siitä, että nesteen jäähdytysyksikkö (14) käsittää termisesti ohjatunAn air recirculation method according to claim 11 or 14, characterized in that the liquid cooling unit (14) comprises a thermally controlled 30 lämpöpumpun (16) ja jäähdytystornin, ja toisen ilmankierrätysosan (5b) lämmöntalteenottoyksikön (7b) ilma/neste lämmönvaihtimen (11b) nestepiirin (13b) neste virtaa termisesti ohjattuun lämpöpumppuun (16) termisesti ohjatun lämpöpumpun (16) ohjaamiseksi, ja jäähdytystornin jäähdytysneste (17) piirin jäähdytysneste (17) virtaa termisesti ohjattuun lämpöpumppuun (16) ja termisesti 35 ohjattu lämpöpumppu (16) luovuttaa lämpöä jäähdytysnesteeseen (17).The fluid of the fluid circuit (13b) of the heat pump unit (7b) of the heat pump (16) and the cooling tower, and the heat recovery unit (7b) of the second air recirculation section (5b) flows to the thermally controlled heat pump (16) to control the thermally controlled heat pump (16), ) the circuit coolant (17) flows to the thermally controlled heat pump (16) and the thermally controlled heat pump (16) transfers heat to the coolant (17). 15 lämpöpumpun (16), ja toisen ilmankierrätysosan (5b) ilma/neste lämmönvaihtimen (11b) nestepiiri (13b) liittyy yhteen tai useampaan termisesti ohjatun lämpöpumpun (16) generaattoriin, ja toisen ilmankierrätysosan (5b) ilma/neste lämmönvaihtimen (11b) nestepiirin (13b) neste jäähdytetään yhdessä tai useammassa termisesti ohjatun lämpöpumpun (16) generaattorissa ohjaamalla 20 termisesti ohjattua lämpöpumppua, ja ensimmäisen ilmankierrätysosan (5a) ja/tai kolmannen ilmankierrätysosan (5c) ilma/neste lämmönvaihtimen (lla-c) nestepiiri (13a,c) liittyy yhteen tai useampaan termisesti ohjatun lämpöpumpun (16) haihduttimeen, ja ensimmäisen ilmankierrätysosa (5a) ja/tai kolmannen ilmankierrätysosan (5c) ilma/neste lämmönvaihtimen (11a,c) nestepiirin (13a,c) 25 neste jäähdytetään yhdessä tai useammassa termisesti ohjatun lämpöpumpun (16) haihduttimessa.The heat circuit (13b) of the heat pump (16) and the air / liquid heat exchanger (11b) of the second air recirculation part (5b) is connected to one or more generators of the thermally controlled heat pump (16), and the air / liquid heat exchanger (11b) of the second air recirculation part (5b) 13b) the liquid is cooled in one or more generators of the thermally controlled heat pump (16) by controlling 20 thermally controlled heat pumps, and the liquid circuit (13a) of the air / liquid heat exchanger (11a-c) of the first air recirculation part (5a) and / or the third air recirculation part (5c) to one or more evaporators of the thermally controlled heat pump (16), and the liquid of the fluid circuit (13a, c) of the air / liquid heat exchanger (11a, c) of the first air recirculation section (5a) and / or the third air recirculation section (5c) is cooled in one or more thermally controlled heat pumps 16) in the evaporator. 16. Minkä tahansa patenttivaatimuksen 11-15 mukainen ilman Air according to any one of claims 11 to 15 20185875 prh 10 -09- 2019 kierrätysmenetelmä, tunnettu siitä, että lämmöntalteenottoyksikkö (7a-c) edelleen käsittää ilma/ilma lämmönvaihtimen (lOa-c), ilma/ilma lämmönvaihtimeen (10ac) liittyvän suihkutusyksikön (21a-c) ja lämmittimen (12a-c), ja kuivausosan kuvusta (6) imetty kostea poistoilma (4a-c) lämmittää ilma/neste 5 lämmönvaihtimelta (lla-c) virtaavan käsitellyn kostean poistoilman (9a-c) ilma/ilma lämmönvaihtimessa (lOa-c), ja suihkutusyksikkö (21a) puhdistaa kostean poistoilman (4a-c) suihkuttamalla puhdistusnestettä, ja lämmitin (12a-c) lämmittää ilma/ilma lämmönvaihtimesta virtaavan käsitellyn kostean poistoilman (9a-c) ennen kun vähintään osan siitä johdetaan kuivausosan kupuun (6).20185875 prh 10 -09- 2019 recycling method, characterized in that the heat recovery unit (7a-c) further comprises an air / air heat exchanger (10a-c), a spray unit (21a-c) connected to the air / air heat exchanger (10ac) and a heater (12a- c), and the moist exhaust air (4a-c) sucked from the hood (6) of the drying section heats the treated moist exhaust air (9a-c) flowing from the air / liquid 5 from the heat exchanger (11a-c) in the heat exchanger (10a-c), and the spray unit ( 21a) cleans the moist exhaust air (4a-c) by spraying the cleaning liquid, and the heater (12a-c) heats the treated moist exhaust air (9a-c) flowing from the air / air heat exchanger before at least a part of it is led to the drying section dome (6). 17. Minkä tahansa patenttivaatimuksen 11-16 mukainen ilmankierrätysmenetelmä, tunnettu siitä, että lämmöntalteenottoyksikkö (7a-c) edelleen käsittää lämmittimen (12a-c) ja toinen ilma/neste lämmönvaihdin (18a-c) käsittää termisesti ohjatun lämpöpumpun (16) jäähdytysneste (17) piiriin liittyvänAn air recirculation method according to any one of claims 11 to 16, characterized in that the heat recovery unit (7a-c) further comprises a heater (12a-c) and the second air / liquid heat exchanger (18a-c) comprises a thermally controlled heat pump (16) coolant (17). ) 18. Minkä tahansa patenttivaatimuksen 11-16 mukainenAccording to any one of claims 11 to 16 25 ilmankierrätysmenetelmä, tunnettu siitä, että kuivausosan kuvun (6) keskelle liittyvä ilmankierrätysosa (5b) käsittää kaksi lämmöntalteenottoyksikköä (7a-c), lämmöntalteenottoyksikkö (7a-c) edelleen käsittää ilma/ilma lämmönvaihtimen (lOa-c), ilma/ilma lämmönvaihtimeen (lOa-c) liittyvän suihkutusyksikön (12a-c) ja lämmittimen (12), ja kuivausosan kuvusta (6) imetty kostea poistoilma (4a-c) 30 lämmittää ilma/ilma lämmönvaihtimessa (lOa-c) ilma/neste lämmönvaihtimesta (lla-c) virtaavaa käsiteltyä kosteaa poistoilmaa (4a-c), ja suihkutusyksikkö (12a-c) puhdistaa kostean poistoilman (4a-c) suihkuttamalla puhdistusnestettä, ja lämmitin (12a-c) lämmittää ilma/ilma lämmönvaihtimelta virtaavaa käsiteltyä kosteaa poistoilmaa (9a-c) ennen kun vähintään osan siitä johdetaan kuivausosan kupuun 35 (6).Air recirculation method, characterized in that the air recirculation part (5b) connected to the center of the dome (6) of the drying section comprises two heat recovery units (7a-c), the heat recovery unit (7a-c) further comprising an air / air heat exchanger (10a-c), an air / air heat exchanger ( The moist exhaust air (4a-c) sucked from the spray unit (12a-c) and the heater (12) and the drying section hood (6) associated with 10a-c) heats the air / air in the heat exchanger (10a-c) from the air / liquid heat exchanger (11a-c) ) flowing treated moist exhaust air (4a-c), and the spray unit (12a-c) cleans the wet exhaust air (4a-c) by spraying the cleaning liquid, and the heater (12a-c) heats the treated wet exhaust air (9a-c) flowing from the air / air heat exchanger before at least part of it is led to the dome 35 (6) of the drying section. 19. Patenttivaatimuksen 18 mukainen ilmankierrätysmenetelmä, tunnettu siitä, että nesteen jäähdytysyksikkö käsittää termisesti ohjatun lämpöpumpun (16) ja kahden lämmöntalteenottoyksikön (7a-c) ilma/neste lämmönvaihtimien (lla-c) nestepiirien (13a-c) neste virtaa yhteen tai useampaan termisesti ohjatun lämpöpumpun (16) generaattoriin termisesti ohjatun 5 lämpöpumpun (16) ohjaamiseksi.Air recirculation method according to claim 18, characterized in that the liquid cooling unit comprises a thermally controlled heat pump (16) and two air recovery units (7a-c) air / liquid of the liquid circuits (13a-c) of the air / liquid heat exchangers (11a-c) flows into one or more thermally controlled a heat pump (16) for generating a thermally controlled heat pump (16) to the generator. 20. Minkä tahansa patenttivaatimuksen 11-19 mukainen ilmankierrätysmenetelmä, tunnettu siitä, että kartonki- tai paperikoneen käydessä rainamaisesta materiaalista (3) ilmaan haihtuvan veden määrä kuivausosan 10 kuvussa (6) rainamaisen materiaalin (3) kulkusuunnassa ( r ) muuttuu, ja kuivausosan kuvun (6) sisälle peräkkäin rainamaisen materiaalin (3) kulkusuunnassa ( r ) on tehty vähintään kolme eri kosteus pitoisuuden omaavaa poistoilmaa (4a-c) luovaa aluetta (15a-c), ja vähintään kolme aluetta (15a-c) sijaitsevat kuivausosan kuvun (6) alkupäässä, kuivausosan kuvun (6) keskellä ja 15 kuivausosan kuvun (6) loppupäässä, ja menetelmässä ensimmäinen ilmankierrätysosa (5a) kierrättää alkupäässä olevan alueen (15a) kosteaa poistoilmaa (4a), toinen ilmankierrätysosa (5b) kierrättää keskellä olevan alueen (15b) kosteaa poistoilmaa (4b) ja kolmas ilmankierrätysosa (5c) kierrättää loppupäässä olevan alueen (15c) kosteaa poistoilmaa (4c).Air recirculation method according to any one of claims 11 to 19, characterized in that the amount of water evaporating from the web-like material (3) in the drier (6) of the drying section 10 changes in the direction (r) of the web-like material (3). 6) at least three exhaust zone (4a-c) generating exhaust air (4a-c) with different moisture contents are formed in succession inside the web-like material (3), and at least three zones (15a-c) are located in the dome (6) of the drying section at the beginning, in the middle of the drying section hood (6) and at the end of the drying section hood (6), and in the method the first air recirculation section (5a) circulates the moist exhaust air (4a) of the initial section (15a), the second air recirculation section (5b) recirculates the central area (15b) the exhaust air (4b) and the third air recirculation section (5c) circulate the moist exhaust air (4c) of the downstream area (15c).
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