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EP0258337A1 - A fire tube boiler for gas firing - Google Patents

A fire tube boiler for gas firing

Info

Publication number
EP0258337A1
EP0258337A1 EP87901410A EP87901410A EP0258337A1 EP 0258337 A1 EP0258337 A1 EP 0258337A1 EP 87901410 A EP87901410 A EP 87901410A EP 87901410 A EP87901410 A EP 87901410A EP 0258337 A1 EP0258337 A1 EP 0258337A1
Authority
EP
European Patent Office
Prior art keywords
boiler
water
temperature
chamber
smoke
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP87901410A
Other languages
German (de)
French (fr)
Inventor
Poul Lunde Hededam
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ecoboilers Af 1986 AS
Original Assignee
Ecoboilers Af 1986 AS
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 Ecoboilers Af 1986 AS filed Critical Ecoboilers Af 1986 AS
Publication of EP0258337A1 publication Critical patent/EP0258337A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/22—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating
    • F24H1/24—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water mantle surrounding the combustion chamber or chambers
    • F24H1/26—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water mantle surrounding the combustion chamber or chambers the water mantle forming an integral body
    • F24H1/28—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water mantle surrounding the combustion chamber or chambers the water mantle forming an integral body including one or more furnace or fire tubes
    • F24H1/285—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water mantle surrounding the combustion chamber or chambers the water mantle forming an integral body including one or more furnace or fire tubes with the fire tubes arranged alongside the combustion chamber
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/10—Control of fluid heaters characterised by the purpose of the control
    • F24H15/156—Reducing the quantity of energy consumed; Increasing efficiency
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/20—Control of fluid heaters characterised by control inputs
    • F24H15/212—Temperature of the water
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
    • F24H15/305—Control of valves
    • F24H15/32—Control of valves of switching valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
    • F24H15/355—Control of heat-generating means in heaters
    • F24H15/36—Control of heat-generating means in heaters of burners
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/0005—Details for water heaters
    • F24H9/0036—Dispositions against condensation of combustion products
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/20—Arrangement or mounting of control or safety devices
    • F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
    • F24H9/2035—Arrangement or mounting of control or safety devices for water heaters using fluid fuel

Definitions

  • the invention relates to a fire tube boiler employing hot water as heat medium and for gas firing.
  • Hot water boilers are known whereby the flue and the smoke tubes are situated in a common water chamber. At the temp ⁇ erature of the return water below the dew point temperature of the smoke tubes it must be ensured by adding supply water that the water entering the water chamber of the boiler is of a temperature being higher than the dew point temperature of the smoke in order to avoid formation of aggressive condensate on the heating surfaces of the boil ⁇ er, said condensate reducing the life of the boiler.
  • the addition of supply water to the return water is carried out by means of a shunt circuit.
  • the known hot water boilers are encumbered with the draw ⁇ back that the boiler must be kept hot during idle periods such as at night and during week-ends, i.e. the shunt-pump must be running all the time and the burner must be activ ⁇ ated according to requirements in order to ensure the required minimum boiler water temperature.
  • the shunt-pump must be running all the time and the burner must be activ ⁇ ated according to requirements in order to ensure the required minimum boiler water temperature.
  • the object of the invention is to provide a boiler of the above type which involves a minimum consumption and loss of energy during idle periods, and which stands up to a start-up involving all possible water temperatures after the idle periods.
  • the boiler according to the invention is characterised in that it is divided into two water chambers, whereby the flue is situated in the first water chamber and the smoke tubes are situated in the second, water chamber, and that the water chambers are interconnected by means of a con ⁇ necting channel provided with a temperature sensor con ⁇ trolling a valve situated in the connecting channel or preferably on the return stub of the boiler in such a manner that the water leaving the connecting channel and. entering the second water chamber is of a temperature higher than or equal to the dew point temperature of the smoke.
  • the boiler can operate without the addition of supply water to the return water irrespective of the temperature of said return water, i.e. without a shunt-pump.
  • the correct temperatures of the heating sur ⁇ faces are obtained solely by a control of the water flow through the boiler and by the boiler being closed automat ⁇ ically from the plant during the idle periods. In this manner the burner of the boiler need not be activated during the idle periods for keeping the boiler hot.
  • the division of the boiler into two water chambers may be provided by means of a preferably plane partition extending within the boiler and substantially parallel to the smoke tubes and the flue, respectively.
  • a preferably plane partition extending within the boiler and substantially parallel to the smoke tubes and the flue, respectively.
  • the connecting channel may be situated on the outside of the boiler and preferably be a pipe.
  • Such an embodiment is also particularly simple and suitable for modification of existing boilers.
  • the fire tube boiler 1 of the Figure is divided into two 10 water chambers 2, 3, whereby the flue 4 is situated in the first water chamber 2, and the smoke tubes 5 are si ⁇ tuated in the second water chamber 3.
  • the water chambers 2, 3 are separated by means of a partition 6 extending transverse to the interior of the boiler and ⁇ _5 substantially parallel to the smoke tubes 5 and the flue 4.
  • the water chambers 2 , 3 are furthermore interconnected by means of a channel in the form of an outer tube 7 si ⁇ tuated on the outside of the boiler.
  • the tube 7 includes a temperature sensor 8 which through 20 a control circuit not shown controls a regulating valve 10 situated on the return stub 9 of the boiler in such a manner that the water leaving the connecting channel in order to run from the first water chamber 2 and into the second water chamber 3 is of a temperature higher than or 25 equal to the dew point temperature of the smoke.
  • the boiler 1 is furthermore provided with a supply stub 11.
  • the re ⁇ gulating valve 10 of the boiler is connected to the return pipe RL of the plant as well as to a distribution pipe VL 30 communicating with the supply pipe FL of the plant, said supply pipe in turn being connected to the supply stub 11 of the boiler 1.
  • a plant pump AP circulates both the water in the plant and the water in the boiler.
  • the boiler operates usually as follows:
  • the return water flows from the plant A through the return 5 pipe RL to the regulating valve 10.
  • the regulating valve allows supply of such an amount of return water into the first chamber 2 that the " lO temperature of the water entering the second water chamber 3 is higher than or equal to the dew point temperature of the smoke tubes.
  • the return water entering the first water chamber is of a temperature below the dew point temperature of
  • the burner of the boiler 1 is closed which 30 implies that the distribution valve 10 is forcedly closed in such a manner that return water is not circulated to the boiler 1..
  • the boiler 1 is closed with respect to circulation from the outer pipe system of the plant, and consequently no loss of heat occurs from the boiler 1 through said plant.
  • the boiler can remain hot for long periods .
  • the boiler can be restarted irrespective of the temperature of the return water of the plant, and in short time the plant can be provided with the desired running temperature.
  • the regulation of the water flow between the two water chambers 2 and 3 ensures too that no condensate arises on the boiler heating sur ⁇ faces .
  • connection channel 7 may be situated inside the boiler, cf. the dotted indication at 7a.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Steam Boilers And Waste-Gas Boilers (AREA)

Abstract

Une chaudière à tube-foyer (1) utilisant de l'eau chaude comme agent thermique et destinée au chauffage à gaz, est divisée en deux chambres d'eau (2 et 3). Le tube-foyer (4) est situé dans la première chambre d'eau (2) et les conduits de fumée (5) sont situés dans la seconde chambre d'eau (3). Les chambres d'eau (2 et 3) sont reliées l'une à l'autre au moyen d'un canal de connexion (7) muni d'un capteur de température (8). Le capteur de température commande une soupape (10) située dans le canal de connexion (7) ou de préférence sur le bec de retour (9) de la chaudière (1), de telle sorte que la température de l'eau quittant le canal de connexion (7) pour entrer dans la seconde chambre (2 ou 3) est supérieure ou égale au point de rosée de la fumée. La chaudière peut ainsi fonctionner sans qu'il faille ajouter de l'eau d'alimentation à l'eau de retour quelle que soit sa température, c'est-à-dire sans qu'il faille recourir à un circuit à dérivation. En outre, les températures de surface chauffantes appropriées sont maintenues uniquement par régulation de l'écoulement d'eau à travers la chaudière, celle-ci étant automatiquement fermée à partir de l'installation durant les périodes de repos. En conséquence, le brûleur de la chaudière n'a pas besoin d'être utilisé pour maintenir la chaudière chaude durant les périodes de repos, ce qui permet une consommation réduite de combustible.A hearth tube boiler (1) using hot water as a thermal agent and intended for gas heating, is divided into two water chambers (2 and 3). The hearth tube (4) is located in the first water chamber (2) and the smoke ducts (5) are located in the second water chamber (3). The water chambers (2 and 3) are connected to each other by means of a connection channel (7) provided with a temperature sensor (8). The temperature sensor controls a valve (10) located in the connection channel (7) or preferably on the return spout (9) of the boiler (1), such that the temperature of the water leaving the channel connection (7) to enter the second chamber (2 or 3) is greater than or equal to the dew point of the smoke. The boiler can thus operate without the need to add feed water to the return water whatever its temperature, that is to say without the need for a bypass circuit. Additionally, appropriate heating surface temperatures are maintained solely by regulating the flow of water through the boiler, with the boiler automatically shut off from the plant during rest periods. As a result, the boiler burner does not need to be used to keep the boiler hot during rest periods, allowing for reduced fuel consumption.

Description

Title: A fire tube boiler for gas firing
Technical Field
The invention relates to a fire tube boiler employing hot water as heat medium and for gas firing.
Background Art
Hot water boilers are known whereby the flue and the smoke tubes are situated in a common water chamber. At the temp¬ erature of the return water below the dew point temperature of the smoke tubes it must be ensured by adding supply water that the water entering the water chamber of the boiler is of a temperature being higher than the dew point temperature of the smoke in order to avoid formation of aggressive condensate on the heating surfaces of the boil¬ er, said condensate reducing the life of the boiler. The addition of supply water to the return water is carried out by means of a shunt circuit.
The known hot water boilers are encumbered with the draw¬ back that the boiler must be kept hot during idle periods such as at night and during week-ends, i.e. the shunt-pump must be running all the time and the burner must be activ¬ ated according to requirements in order to ensure the required minimum boiler water temperature. By many plants such a procedure causes an annual increase of the energy consumption by up to 10%. When the shunt-pump is not run- ning during the idle period the water temperature within the water chamber may drop below the dew point temperature of the smoke which implies that condensate appears on the heating surface's of the smoke tubes during the succeeding long start-up period.
Description of the Invention The object of the invention is to provide a boiler of the above type which involves a minimum consumption and loss of energy during idle periods, and which stands up to a start-up involving all possible water temperatures after the idle periods.
The boiler according to the invention is characterised in that it is divided into two water chambers, whereby the flue is situated in the first water chamber and the smoke tubes are situated in the second, water chamber, and that the water chambers are interconnected by means of a con¬ necting channel provided with a temperature sensor con¬ trolling a valve situated in the connecting channel or preferably on the return stub of the boiler in such a manner that the water leaving the connecting channel and. entering the second water chamber is of a temperature higher than or equal to the dew point temperature of the smoke. As a result the boiler can operate without the addition of supply water to the return water irrespective of the temperature of said return water, i.e. without a shunt-pump. The correct temperatures of the heating sur¬ faces are obtained solely by a control of the water flow through the boiler and by the boiler being closed automat¬ ically from the plant during the idle periods. In this manner the burner of the boiler need not be activated during the idle periods for keeping the boiler hot.
According to the invention the division of the boiler into two water chambers may be provided by means of a preferably plane partition extending within the boiler and substantially parallel to the smoke tubes and the flue, respectively. In practice such an embodiment turned out to be particularly advantageous because it can be utilized for a modification of existing boilers.
Finally according to the invention the connecting channel may be situated on the outside of the boiler and preferably be a pipe. Such an embodiment is also particularly simple and suitable for modification of existing boilers.
Brief Description of the Drawing
5 The invention will be described below with reference to the accompanying drawing, in which a preferred embodiment of the boiler according to the invention is illustrated.
Description of the Preferred Embodiments of the Invention
The fire tube boiler 1 of the Figure is divided into two 10 water chambers 2, 3, whereby the flue 4 is situated in the first water chamber 2, and the smoke tubes 5 are si¬ tuated in the second water chamber 3. Within the boiler the water chambers 2, 3 are separated by means of a partition 6 extending transverse to the interior of the boiler and τ_5 substantially parallel to the smoke tubes 5 and the flue 4. The water chambers 2 , 3 are furthermore interconnected by means of a channel in the form of an outer tube 7 si¬ tuated on the outside of the boiler.
The tube 7 includes a temperature sensor 8 which through 20 a control circuit not shown controls a regulating valve 10 situated on the return stub 9 of the boiler in such a manner that the water leaving the connecting channel in order to run from the first water chamber 2 and into the second water chamber 3 is of a temperature higher than or 25 equal to the dew point temperature of the smoke. The boiler 1 is furthermore provided with a supply stub 11.
When the boiler is to be connected to a plant A, the re¬ gulating valve 10 of the boiler is connected to the return pipe RL of the plant as well as to a distribution pipe VL 30 communicating with the supply pipe FL of the plant, said supply pipe in turn being connected to the supply stub 11 of the boiler 1. A plant pump AP. circulates both the water in the plant and the water in the boiler.
The boiler operates usually as follows:
The return water flows from the plant A through the return 5 pipe RL to the regulating valve 10. Controlled by the temperature sensor 8 in the outer connecting channel 7 between the first water chamber 2 and the second water chamber 3, the regulating valve allows supply of such an amount of return water into the first chamber 2 that the "lO temperature of the water entering the second water chamber 3 is higher than or equal to the dew point temperature of the smoke tubes. In this connection please note that even though the return water entering the first water chamber is of a temperature below the dew point temperature of
]_5 the smoke, no damaging condensate arises within this cham¬ ber because it turned out that down to the minimum load of the burner burners adapted to natural gas ensure heat¬ ing surface- and combustion temperatures in the flue which prevents condensate from arising on the heating
20 surfaces of the flue even though the temperature of the water chamber surrounding the fire tube is very low, i.e. down to 0°C. When the water has entered the second water chamber it is gradually heated by the smoke tubes 5. Subse¬ quently the water leaves through the supply stub 1.1 of
25 the boiler, and. immediately thereafter it is admixed with return water flowing through the distribution pipe VL in order to achieve the desired supply temperature.
During idle periods, i.e. when the plant A need not sup¬ ply heating, the burner of the boiler 1 is closed which 30 implies that the distribution valve 10 is forcedly closed in such a manner that return water is not circulated to the boiler 1.. In this manner the boiler 1 is closed with respect to circulation from the outer pipe system of the plant, and consequently no loss of heat occurs from the boiler 1 through said plant. As a result, the boiler can remain hot for long periods . After the idle periods the boiler can be restarted irrespective of the temperature of the return water of the plant, and in short time the plant can be provided with the desired running temperature. During the latter start-up period the regulation of the water flow between the two water chambers 2 and 3 ensures too that no condensate arises on the boiler heating sur¬ faces .
The ^invention may be varied in many ways without thereby deviating from the scope thereof. Thus the connecting channel 7 may be situated inside the boiler, cf. the dotted indication at 7a.

Claims

Claims :
1. A fire tube boiler (1) employing hot water as heat medium and for gas firing, c h a r a c t e r i s e d in that it is divided into two water chambers (2, 3) , whereby the flue (4) is situated in the first water chamber (2) and the smoke tubes (5) are situated in the second water chamber (3) , (a d that the water chambers (2 and 3) are interconnected by means of a connecting channel (7) provided with a temperature sensor (8) controlling a valve (10) situated in the connecting channel (7) or preferably on the return stub (9) of the boiler (1) in such a lanne-r that the water leaving the connecting channel (7) and entering the second water chamber (3) is of a temperature higher than or equal to the dew point temperature of the smoke .
2. A boiler as claimed in claim 1, c h a r a c t e r¬ i s e d in that the dividing thereof into two water cham¬ bers (2, 3) is provided by means of a preferably plane partition (6) extending within the boiler and substantially parallel to the smoke tubes (5) and the flue (4) , respec¬ tively .
3. A boiler as claimed in claim 1 or 2, c h a r a c¬ t e r i s e d in that the connecting channel (7) is si¬ tuated on the outside of the boiler and is preferably a tube.
EP87901410A 1986-02-24 1987-02-24 A fire tube boiler for gas firing Withdrawn EP0258337A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK851/86 1986-02-24
DK85186A DK85186D0 (en) 1986-02-24 1986-02-24 NATURAL GAS COATED CHANNEL SCREW

Publications (1)

Publication Number Publication Date
EP0258337A1 true EP0258337A1 (en) 1988-03-09

Family

ID=8098259

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87901410A Withdrawn EP0258337A1 (en) 1986-02-24 1987-02-24 A fire tube boiler for gas firing

Country Status (4)

Country Link
EP (1) EP0258337A1 (en)
AU (1) AU7088787A (en)
DK (1) DK85186D0 (en)
WO (1) WO1987005094A1 (en)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI40385B (en) * 1959-04-27 1968-09-30 Bahco Ab
SE371004B (en) * 1967-02-16 1974-11-04 Ctc Ab
FR2273239A1 (en) * 1974-05-31 1975-12-26 Fonderie Soc Gen De Central heating system boiler - has cast heat exchanger removably bolted on hearth
DE2837004A1 (en) * 1978-08-24 1980-03-06 Bernstein Lennart METHOD AND HEATING BOILER FOR HEATING THE HEATING WATER IN A HOT WATER CENTRAL HEATING SYSTEM, ESPECIALLY FOR DETACHED AND MULTI-FAMILY RESIDENTIAL HOUSES
DE3032089C2 (en) * 1980-08-26 1987-01-02 Hans Ing.(grad.) 5062 Forsbach Lamberti Switch-off device for the circulation pump of a regulated heating system with mixing valve
EP0203922A1 (en) * 1984-02-15 1986-12-10 EICHHORN, Karl Device for a heating installation

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8705094A1 *

Also Published As

Publication number Publication date
AU7088787A (en) 1987-09-09
DK85186D0 (en) 1986-02-24
WO1987005094A1 (en) 1987-08-27

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Inventor name: HEDEDAM, POUL, LUNDE