WO2013045534A1 - Method and devices-system for decreasing the temperature of blast furnace gas temperature peaks - Google Patents
Method and devices-system for decreasing the temperature of blast furnace gas temperature peaks Download PDFInfo
- Publication number
- WO2013045534A1 WO2013045534A1 PCT/EP2012/069051 EP2012069051W WO2013045534A1 WO 2013045534 A1 WO2013045534 A1 WO 2013045534A1 EP 2012069051 W EP2012069051 W EP 2012069051W WO 2013045534 A1 WO2013045534 A1 WO 2013045534A1
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- WO
- WIPO (PCT)
- Prior art keywords
- dedusting device
- blast
- blast furnace
- furnace gas
- pressure
- 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.)
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B1/00—Shaft or like vertical or substantially vertical furnaces
- F27B1/10—Details, accessories or equipment specially adapted for furnaces of these types
- F27B1/18—Arrangements of dust collectors
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/002—Evacuating and treating of exhaust gases
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/007—Controlling or regulating of the top pressure
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/24—Test rods or other checking devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B1/00—Shaft or like vertical or substantially vertical furnaces
- F27B1/10—Details, accessories or equipment specially adapted for furnaces of these types
- F27B1/28—Arrangements of monitoring devices, of indicators, of alarm devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/20—Arrangements for treatment or cleaning of waste gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/30—Arrangements for extraction or collection of waste gases; Hoods therefor
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
- C21B2100/60—Process control or energy utilisation in the manufacture of iron or steel
- C21B2100/64—Controlling the physical properties of the gas, e.g. pressure or temperature
Definitions
- the present invention relates to a method and a device for decreasing the temperature of blast-furnace gas temperature peaks.
- peaks of temperature of the blast furnace gas can occur. Such peaks of temperature, which can reach up to 1300°C, can be caused by several kinds of events in the blast furnace. For example, occurrence of peaks of temperature of the blast furnace gas is facilitated when grain sizes of the blast furnace burden segregate during charging of the blast furnace. At the angle of repose of the burden coarse grain of the burden rolls towards the centre of the blast furnace, while fine grain stays near the wall of the blast furnace shaft. The more coarse grain is present in a region of the blast furnace, the more flow-channels are available for gas streaming upwards through this region - accordingly, in those regions upstreaming gas meets less resistance and streams faster.
- blast-furnace gas may exit the burden with a temperature of more than 600°C, usually 1000°C or more than 1000°C, this blast-furnace gas being under a pressure much increased compared to normal operation of the blast furnace, which leads to opening of the bleeder valves at the top of the furnace.
- Another situation which leads to peaks of temperature of the blast furnace gas is collapsing of bridges of melting ore burden which have been formed during descending of the blast furnace's burden.
- While the devices for diverting and for treating of the blast-furnace gas which accompany a blast furnace are mainly designed to cope with temperature and pressure occurring during normal operation of the blast furnace, in case of a peak of temperature and pressure of the blast-furnace gas these parameters are above the levels of normal operation.
- the high temperature of the blast-furnace gas in case of a peak may lead to overheating of the blast furnace's upper parts and of the devices for diverting and for treating - e.g. purifying - of the blast-furnace gas.
- the permitted maximum pressure in the blast furnace system may be exceeded by the pressure peak, necessitating to relieve pressure by a means for relieving pressure - which is called bleeder -, into the atmosphere. This results in pollution of the atmosphere, especially by carbon monoxide and dust.
- the pressure of the blast-furnace gas is being measured continuously, and injection of water into the blast-furnace gas is triggered off when a threshold value for the pressure is exceeded,
- Measuring of the pressure of the blast-furnace gas according to the invention permits diagnosing development of a slip at an early stage before a distinctive rise of temperature occurs.
- a threshold value for the pressure is exceeded injection of water into the blast-furnace gas is triggered off.
- actions for decreasing temperature and smoothing temperature peaKs are taKen earner when compared to off-take temperature-monitoring based slip detection.
- the pressure of blast-furnace gas during normal operation depends on the type of construction and on the blast furnace's mode of operation. Consequently, in each case a different threshold value is characteristic for the development of a slip.
- the threshold value for the pressure of the blast-furnace gas is set by the blast furnace's operator according to the conditions in the respective blast furnace.
- the injection of water is carried out in at least one member of the group consisting of the three members
- the furnace throat is the upper part of the blast furnace where material is charged into the furnace. It ends where the off-takes begin and it starts at the upper level of the burden material inside the furnace.
- the first dedusting device may be followed by a second, e.g. less heat resistant, dedusting device, to which the blast furnace gas is led via pipes.
- a second dedusting device e.g. less heat resistant, dedusting device
- injection of water in such pipes keeps exposition of the second dedusting device to the hot blast furnace gas small.
- the second dedusting device may be followed by a further, e.g. less heat resistant, dedusting device, to which the blast furnace gas is led via pipes.
- a further dedusting device e.g. less heat resistant, dedusting device
- An embodiment of the present invention is injection or water Deing carried out in pipes through which the blast furnace gas is diverted from the first dedusting device where a first step of dedusting, e.g. coarse dedusting, takes place, to any further dedusting device where subsequent steps of dedusting take place prior to the blast furnace gas joining a common system.
- the expression common system refers to the blast furnace gas distribution network, into which the gas joins after it has been cleaned by the various dedusting stages.
- the gas from the furnace can be combined in this system with cleaned gas from other blast furnaces on the site, hence the system is common to all the furnaces - leading to the expression common system.
- the pressure of the blast-furnace gas is being measured in the off-takes through which blast-furnace gas is diverted from the blast furnace. According to another embodiment of the invention the pressure of the
- blast-furnace gas is being measured upstream of the off-takes in the direction of flow of the blast furnace gas. Thereby, earlier detection of a peak of temperature is possible.
- the direction of flow of the blast furnace gas is from the burden to the offtakes.
- the pressure of the blast-furnace gas may be measured in the area of the blast furnace's furnace throat.
- the first dedusting device is a
- dry dedusting device preferably cyclone or dust catcher
- a dustcatcher is a coarse dust separation device using gravity forces and low velocities for dust separation. In comparison the cyclone uses centrifugal forces for dust separation.
- it is a dry dedusting device.
- the further dedusting device is a member of the group containing - dry dedusting device, preferably Dag-niter,
- a further object of the invention is a
- the means for measuring the pressure comprises probes in the off-takes through which blast-furnace gas is diverted from the blast furnace.
- tne means Tor measuring tne pressure comprises probes in the area of the blast furnace's furnace throat.
- the means for injection of water comprises injection nozzles in the area of the blast furnace's throat.
- the nozzles belong to one or several of the nozzle-types in the group - spillback nozzle,
- Spillback nozzles and twin fluid nozzles are especially preferred due to the fine water droplets which can be produced.
- Twin fluid nozzles are especially favourable since due to the water's atomisation with gas like compressed air or nitrogen the amount of water injected per time unit can be changed very quickly, which allows to react quickly when conditions in the blast furnace gas change. Hence, too little or too much cooling of the blast furnace gas can be avoided.
- the nozzles belonging to one or several of the nozzle-types in the group are nozzles belonging to one or several of the nozzle-types in the group.
- a typical spiral nozzle has a d90 of about 1000 ⁇ ; a typical spillback nozzle has a d90 of about 600 ⁇ ; a typical twin fluid nozzle has a d90 of about 150- 200 m. According to one embodiment of the invention
- the first dedusting device is a
- - dry dedusting device preferably cyclone or dust catcher.
- the second dedusting device is a member of the group containing
- the further dedusting device is a member of the group containing
- Figure 1 shows a schematic view of a device according to an embodiment of the invention.
- Figure 2 shows the development of temperature and pressure of blast furnace gas when peaks of temperature of the blast furnace gas occur.
- Blast furnace 1 is filled with burden 2.
- Blast-furnace gas depicted by arrows, is diverted from the blast furnace 1 by several lines of off-take 3.
- Means for injection of water 4 are provided in the area of the blast furnace's furnace throat 5, in this case a twin fluid nozzle which produces droplets with a d90 of 200 ⁇ .
- Means for measuring the pressure 6 of the blast-furnace gas are provided at four different positions in the several lines of off-take 3 and in the blast furnace throat 5.
- a means for triggering off 7 the means for injection of water 4 based on a signal of the means for measuring the pressure 6 is connected to both the means for injection of water 4 and the means for measuring the pressure 6.
- the connection may be physical, e.g. by wire, or non- physical, e.g. by wireless signals.
- a first dedusting device 8 for treating of the blastfurnace gas for coarse dedusting is also shown, in this case a dust catcher.
- blast furnace gas is diverted to the first dedusting device 8 via pipe 9. Via pipe 10 blast furnace gas is diverted from the first dedusting device 8, e.g. to a second dedusting device.
- Figure 2 shows typical pressure ana temperature readings Tor Diast furnace gas, a peak of temperature of more than 300°C is preceeded by a peak in pressure of more than 250kPa(g) by about 60 seconds.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
- Blast Furnaces (AREA)
Abstract
The present invention provides a method for decreasing the temperature of blast-furnace gas temperature peaks which is characterized in that the pressure of the blast-furnace gas is being measured continuously, and injection of water into the blast-furnace gas is triggered off when a threshold value for the pressure is exceeded. The injection of water is carried out in at least one member of the group consisting of the three members blast furnace's furnace throat, off-takes through which blast furnace gas is diverted from the blast furnace to a -first dedusting device, pipes through which the blast furnace gas is diverted from the first dedusting device to a second dedusting device or from the second dedusting device to a further dedusting device. It also provides a devices-system for performing the method comprising means for triggering off (7) the means for injection of water (4) based on a signal of the means for measuring the pressure (6).
Description
Description
Title of the invention Method and devices-system for decreasing the temperature of blast furnace gas temperature peaks
Technical Field The present invention relates to a method and a device for decreasing the temperature of blast-furnace gas temperature peaks.
Background
During production of pig iron in a blast furnace peaks of temperature of the blast furnace gas can occur. Such peaks of temperature, which can reach up to 1300°C, can be caused by several kinds of events in the blast furnace. For example, occurrence of peaks of temperature of the blast furnace gas is facilitated when grain sizes of the blast furnace burden segregate during charging of the blast furnace. At the angle of repose of the burden coarse grain of the burden rolls towards the centre of the blast furnace, while fine grain stays near the wall of the blast furnace shaft. The more coarse grain is present in a region of the blast furnace, the more flow-channels are available for gas streaming upwards through this region - accordingly, in those regions upstreaming gas meets less resistance and streams faster. With diminishing resistance exerted by the burden in regions in the blast furnace - for example the central region of the blast furnace - the velocity of flow of the gas may increase so much that the burden is hardly able to assimilate heat from the gas. Depending on its type of construction, hot blast is blown into a blast furnace under a pressure of up to 5*105 Pa(g). In case a plurality of flow-cannels in the burden are available to the gas, only a small amount of heat is withdrawn from the gas during its journey through the burden, and hardly any pressure drop occurs - in such a case blast-furnace gas may exit the burden with a temperature of more than 600°C, usually 1000°C or more than 1000°C, this blast-furnace gas being under a pressure much increased compared to normal operation of the blast furnace, which leads to opening of the bleeder valves at the top of the furnace.
Another situation which leads to peaks of temperature of the blast furnace gas is collapsing of bridges of melting ore burden which have been formed during descending of the blast furnace's burden.
While the devices for diverting and for treating of the blast-furnace gas which accompany a blast furnace are mainly designed to cope with temperature and pressure occurring during normal operation of the blast furnace, in case of a peak of temperature and pressure of the blast-furnace gas these parameters are above the levels of normal operation. The high temperature of the blast-furnace gas in case of a peak may lead to overheating of the blast furnace's upper parts and of the devices for diverting and for treating - e.g. purifying - of the blast-furnace gas. In addition, the permitted maximum pressure in the blast furnace system may be exceeded by the pressure peak, necessitating to relieve pressure by a means for relieving pressure - which is called bleeder -, into the atmosphere. This results in pollution of the atmosphere, especially by carbon monoxide and dust.
In order to diminish effects of peaks of temperature of the blast furnace gas, it is well known to monitor the temperature in the so called off-takes, through which blast- furnace gas is diverted from the blast furnace. The so called burden-spray, which is allocated in the area of the blast furnace's throat, is activated as soon as a preset value for the temperature of the blast-furnace gas is exceeded. The burden-spray injects water into the space in the area of the blast furnace's throat. The temperature of the blast furnace gas is decreased due to evaporation of the injected water, thereby diminishing the danger of overheating of the upper areas of the blast furnace and of the accompanying devices for diverting and for treating the blast furnace gas. Unfavourably, a portion of the injected amount of water wets the burden and is not available for efficient and rapid cooling of the blast furnace gas. In addition, monitoring of the temperature in the off-takes in conjunction with inherent retardation of temperature measurements leads to a somewhat delayed activation of the burden- spray. Therefore, the high temperature of the peak perpetuates for some time, the devices for diverting and for treating of the blast-furnace gas having to master such temperatures. Hence, in systems with temperature-monitoring based detection of peaks of temperature of the blast furnace gas a certain temperature tolerance has to be provided for the blast-furnaces upper parts and the devices for diverting and for treating of the blast-furnace gas.
Summary of the invention
Technical problem It is the object of the present invention to provide a method and device for decreasing the temperature of blast furnace gas temperature peaks, which avoid the
disadvantages of off-take temperature-monitoring based temperature peak detection.
Solution to problem
This is achieved by
a method for decreasing the temperature of blast-furnace gas temperature peaks, characterized in that
the pressure of the blast-furnace gas is being measured continuously, and injection of water into the blast-furnace gas is triggered off when a threshold value for the pressure is exceeded,
the injection of water being carried out in at least one member of the group consisting of the three members
- blast furnace's furnace throat,
- off-takes through which blast furnace gas is diverted from the blast furnace to a first dedusting device,
- pipes through which the blast furnace gas is diverted
+ from the first dedusting device to a second dedusting device
or
+ from the second dedusting device to a further dedusting device.
Advantageous effects of invention
It has been found by the inventors that a distinctive rise of temperature caused by events leading to temperature peaks occurs after a distinctive rise in pressure of the blast furnace gas.
Measuring of the pressure of the blast-furnace gas according to the invention permits diagnosing development of a slip at an early stage before a distinctive rise of temperature occurs. When a threshold value for the pressure is exceeded injection of water into the blast-furnace gas is triggered off. Hence, actions for decreasing
temperature and smoothing temperature peaKs are taKen earner when compared to off-take temperature-monitoring based slip detection.
The pressure of blast-furnace gas during normal operation depends on the type of construction and on the blast furnace's mode of operation. Consequently, in each case a different threshold value is characteristic for the development of a slip.
Therefore, the threshold value for the pressure of the blast-furnace gas is set by the blast furnace's operator according to the conditions in the respective blast furnace.
The injection of water is carried out in at least one member of the group consisting of the three members
- blast furnace's furnace throat,
- off-takes through which blast furnace gas is diverted from the blast furnace to a first dedusting device,
- pipes through which the blast furnace gas is diverted
+ from the first dedusting device to a second dedusting device
or
+ from the second dedusting device to a further dedusting device.
The furnace throat is the upper part of the blast furnace where material is charged into the furnace. It ends where the off-takes begin and it starts at the upper level of the burden material inside the furnace.
When injection of water I carried out in the area of the blast furnace's throat, exposition of blast furnace parts in the blast furnace's throat to the hot blast furnace gas at the temperature of the peak is kept small.
When injection of water is carried out in the off-takes through which blast furnace gas is diverted from the blast furnace to a first dedusting device exposition of this first dedusting device to the hot blast furnace gas at the temperature of the peak is kept small.
The first dedusting device may be followed by a second, e.g. less heat resistant, dedusting device, to which the blast furnace gas is led via pipes. Hence, injection of water in such pipes keeps exposition of the second dedusting device to the hot blast furnace gas small.
The second dedusting device may be followed by a further, e.g. less heat resistant, dedusting device, to which the blast furnace gas is led via pipes. Hence, injection of water in such pipes keeps exposition of the further dedusting device to the hot blast furnace gas small.
An embodiment of the present invention is injection or water Deing carried out in pipes through which the blast furnace gas is diverted from the first dedusting device where a first step of dedusting, e.g. coarse dedusting, takes place, to any further dedusting device where subsequent steps of dedusting take place prior to the blast furnace gas joining a common system. The expression common system refers to the blast furnace gas distribution network, into which the gas joins after it has been cleaned by the various dedusting stages. The gas from the furnace can be combined in this system with cleaned gas from other blast furnaces on the site, hence the system is common to all the furnaces - leading to the expression common system.
According to one embodiment of the invention, the pressure of the blast-furnace gas is being measured in the off-takes through which blast-furnace gas is diverted from the blast furnace. According to another embodiment of the invention the pressure of the
blast-furnace gas is being measured upstream of the off-takes in the direction of flow of the blast furnace gas. Thereby, earlier detection of a peak of temperature is possible. The direction of flow of the blast furnace gas is from the burden to the offtakes. For example, the pressure of the blast-furnace gas may be measured in the area of the blast furnace's furnace throat.
According to one embodiment of the invention
the first dedusting device is a
dry dedusting device, preferably cyclone or dust catcher,
A dustcatcher is a coarse dust separation device using gravity forces and low velocities for dust separation. In comparison the cyclone uses centrifugal forces for dust separation.
Preferably it is a dry dedusting device.
According to a further embodiment of the invention the second dedusting device is a member of the group containing
- dry dedusting device, preferably bag-filter,
- wet dedusting device, preferably scrubber
According to a further embodiment of the invention the further dedusting device is a member of the group containing
- dry dedusting device, preferably Dag-niter,
- wet dedusting device, preferably scrubber.
A further object of the invention is a
devices-system for performing an inventive method,
with
- a blast furnace with a furnace throat,
- means for measuring the pressure of the blast-furnace gas generated during operation of the blast furnace,
- means for injection of water,
characterized in that the means for injection of water
being suitable to inject water into at least one member of the group consisting of the three members
- blast furnace's furnace throat,
- off-takes for diverting the blast furnace gas from the blast furnace to a first dedusting device,
- pipes through which the blast furnace gas is diverted
+ from the first dedusting device to a second dedusting device
or
+ from the second dedusting device to a further dedusting device, and in that it comprises
means for triggering off
the means for injection of water
based on a signal
of the means for measuring the pressure. Thereby injection of water can be triggered off when a threshold value for pressure is exceeded.
According to a preferred embodiment
the means for measuring the pressure comprises probes in the off-takes through which blast-furnace gas is diverted from the blast furnace.
According to a preferred embodiment, tne means Tor measuring tne pressure comprises probes in the area of the blast furnace's furnace throat.
Advantageously,
the means for injection of water comprises injection nozzles in the area of the blast furnace's throat. Thereby the exposition of blast furnace parts to the hot blast furnace gas at the temperature of the temperature peak exiting the burden is kept small.
Preferably, the nozzles belong to one or several of the nozzle-types in the group - spillback nozzle,
- twin fluid nozzle,
- spiral nozzle.
Using such nozzles for burden spray injection of water in combination with the inventive continuous measuring of the pressure of the blast-furnace gas to avoid blast-furnace gas temperature peaks increases the efficiency of the water injection. Those nozzles produce smaller water droplets which evaporate before reaching the blast furnace burden, hence wetting of the burden will be minimized or avoided. Compared to burden spray injection of water droplets with larger droplet diameter which wets the burden - i.e. burden spray injection of water in which not all of the injected water is evaporated and thereby not available for cooling the temperature peak - the same cooling effect can be achieved with less injected water.
Furthermore, the unfavourable effects of wetting the burden are minimized or avoided.
Spillback nozzles and twin fluid nozzles are especially preferred due to the fine water droplets which can be produced. Twin fluid nozzles are especially favourable since due to the water's atomisation with gas like compressed air or nitrogen the amount of water injected per time unit can be changed very quickly, which allows to react quickly when conditions in the blast furnace gas change. Hence, too little or too much cooling of the blast furnace gas can be avoided.
The nozzles belonging to one or several of the nozzle-types in the group
- spillback nozzle,
- twin fluid nozzle,
- spiral nozzle
preferably are nozzles producing droplets wit a diameter d90 equal to or smaller than 1000 μηη. A typical spiral nozzle has a d90 of about 1000μηι; a typical spillback nozzle has a d90 of about 600 μηη; a typical twin fluid nozzle has a d90 of about 150- 200 m.
According to one embodiment of the invention
the first dedusting device is a
- dry dedusting device, preferably cyclone or dust catcher.
According to another embodiment of the invention
the second dedusting device is a member of the group containing
- dry dedusting device, preferably bag-filter,
- wet dedusting device, preferably scrubber.
According to another embodiment of the invention
the further dedusting device is a member of the group containing
- dry dedusting device, preferably bag-filter,
- wet dedusting device, preferably scrubber.
The invention is explained based on the following schematic exemplary drawings.
Figure 1 shows a schematic view of a device according to an embodiment of the invention.
Figure 2 shows the development of temperature and pressure of blast furnace gas when peaks of temperature of the blast furnace gas occur.
Blast furnace 1 is filled with burden 2. Blast-furnace gas, depicted by arrows, is diverted from the blast furnace 1 by several lines of off-take 3. Means for injection of water 4 are provided in the area of the blast furnace's furnace throat 5, in this case a twin fluid nozzle which produces droplets with a d90 of 200 μηη. Means for measuring the pressure 6 of the blast-furnace gas are provided at four different positions in the several lines of off-take 3 and in the blast furnace throat 5. A means for triggering off 7 the means for injection of water 4 based on a signal of the means for measuring the pressure 6 is connected to both the means for injection of water 4 and the means for measuring the pressure 6. The connection may be physical, e.g. by wire, or non- physical, e.g. by wireless signals. A first dedusting device 8 for treating of the blastfurnace gas for coarse dedusting is also shown, in this case a dust catcher.
From off-take 3 blast furnace gas is diverted to the first dedusting device 8 via pipe 9. Via pipe 10 blast furnace gas is diverted from the first dedusting device 8, e.g. to a second dedusting device.
Figure 2 shows typical pressure ana temperature readings Tor Diast furnace gas, a peak of temperature of more than 300°C is preceeded by a peak in pressure of more than 250kPa(g) by about 60 seconds.
Reference sign list
1 Blast furnace
2 Burden
3 Line of off- take
4 Means for injection of water
5 blast furnace's furnace throat
6 Means for measuring the pressure of the blast-furnace gas
7 means for triggering off (the means for injection of water 4)
8 first dedusting device
9 pipe
Claims
1. Method for decreasing the temperature of blast-furnace gas temperature peaks, characterized in that
the pressure of the blast-furnace gas is being measured continuously, and injection of water into the blast-furnace gas is triggered off when a threshold value for the pressure is exceeded,
the injection of water being carried out in at least one member of the group consisting of the three members
- blast furnace's (1 ) furnace throat (5),
- off-takes (3) through which blast furnace gas is diverted from the blast furnace (1 ) to a - first dedusting device (8),
- pipes (9,10) through which the blast furnace gas is diverted
+ from the first dedusting device (8) to a second dedusting device
or
+ from the second dedusting device to a further dedusting device.
2. Method according to claim 1 , characterized in that the pressure of the blast-furnace gas is being measured in the off-takes (3).
3. Method according to claim 1 or 2, characterized in that the pressure of the
blast-furnace gas is being measured upstream of the off-takes (3) in the direction of flow of the blast furnace gas.
4. Method according to any one of claims 1 to 3, characterized in that the first dedusting device (8) is a member of the group containing
- dry dedusting device, preferably cyclone or dust catcher.
5. Method according to any one of claims 1 to 4, characterized in that the second dedusting device is a member of the group containing
- dry dedusting device, preferably bag-filter,
- wet dedusting device, preferably scrubber.
6. Method according to any one of claims 1 to 5, characterized in that the further dedusting device is a member of the group containing - dry dedusting device, preferably bag-filter,
- wet dedusting device, preferably scrubber.
7. Devices-system for performing a method according to claim 1 ,
with
- a blast furnace (1 ) with a furnace throat (5),
- means for measuring the pressure (6) of the blast-furnace gas generated during operation of the blast furnace (1 ),
- means for injection of water (4),
characterized in that the means for injection of water (4)
being suitable to inject water into at least one member of the group consisting of the three members
- blast furnace's furnace throat,
- off-takes (3) for diverting the blast furnace gas from the blast furnace to a first dedusting device (8),
- pipes through which the blast furnace gas is diverted
+ from the first dedusting device (8) to a second dedusting device
or
+ from the second dedusting device to a further dedusting device, and in that it comprises
means for triggering off (7)
the means for injection of water (4)
based on a signal
of the means for measuring the pressure (6).
8. Devices-system according to claim 7, characterized in that the means for measuring the pressure (6) comprises probes in the off-takes (3).
9. Devices-system according to claim 8 or 9, characterized in that the means for measuring the pressure (6) comprises probes in the blast furnace's (1 ) furnace throat (5).
10. Devices-system according to any one of claims 7 to 9, characterized in that the means for injection of water (4) comprises injection nozzles.
1 1. Devices-system according to claim 10, characterized in that the nozzles belong to one or several of the nozzle-types in the group
- spillback nozzle,
- twin fluid nozzle,
- spiral nozzle.
12. Devices-system according to any one of claims 7 to 1 1 , characterized in that the first dedusting device (8) is a member of the group containing
- dry dedusting device, preferably cyclone,
- wet dedusting device, preferably scrubber.
13. Devices-system according to any one of claims 7 to 12, characterized in that the second dedusting device is a member of the group containing
- dry dedusting device, preferably bag-filter,
- wet dedusting device, preferably scrubber.
14. Devices-system according to any one of claims 7 to 13, characterized in that the further dedusting device is a member of the group containing
- dry dedusting device, preferably bag-filter,
- wet dedusting device, preferably scrubber.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP11183103A EP2574873A1 (en) | 2011-09-28 | 2011-09-28 | Method and device for decreasing the temperature of blast furnace gas temperature peaks |
| EP11183103.8 | 2011-09-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2013045534A1 true WO2013045534A1 (en) | 2013-04-04 |
Family
ID=46980941
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2012/069051 Ceased WO2013045534A1 (en) | 2011-09-28 | 2012-09-27 | Method and devices-system for decreasing the temperature of blast furnace gas temperature peaks |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP2574873A1 (en) |
| WO (1) | WO2013045534A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3159640A1 (en) | 2015-10-20 | 2017-04-26 | Danieli Corus BV | Cleaning furnace gas process and metal production plant |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104928421B (en) * | 2015-06-30 | 2016-10-05 | 攀钢集团西昌钢钒有限公司 | The Method of Changing the Excessive Throat Temperature Difference in Blast Furnace Smelting |
| CN115578612B (en) * | 2022-10-11 | 2023-08-04 | 浙江大学 | Blast furnace top distribution stage identification method and device based on marker target detection |
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|---|---|---|---|---|
| US3549138A (en) * | 1968-10-08 | 1970-12-22 | James L Thomas | Method of pressure equalizing for blast furnace top |
| DE2306887A1 (en) * | 1973-02-13 | 1974-08-15 | Ignis Huettenbau Ag | Shaft furnace gas cleaning - with automatic by-pass of gas cleaning appts in event of appts failure |
| US4152123A (en) * | 1977-12-16 | 1979-05-01 | Gottfried Bischoff Bau Kompl. Gasreinigungs- Und Wasserruckkuhlanlagen Gmbh & Co. Kommanditgesellschaft | Gas-cleaning apparatus and method for high-pressure blast furnace |
| JPS5941407A (en) * | 1982-08-30 | 1984-03-07 | Mitsui Eng & Shipbuild Co Ltd | Dry dust separator for exhaust gas from blast furnace |
| JPS5974207A (en) * | 1982-10-21 | 1984-04-26 | Mitsui Eng & Shipbuild Co Ltd | Safety device of top pressure energy recovering device of blast furnace |
| JPS61152908A (en) * | 1984-12-26 | 1986-07-11 | Kawasaki Steel Corp | Device of recovering power by means of pressure gas |
| JPS63109109A (en) * | 1986-10-28 | 1988-05-13 | Nippon Steel Corp | Blast furnace gas cleaning equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4000885A (en) * | 1974-11-18 | 1977-01-04 | Whiting Corporation | Cupola furnace waste gas recuperative system and method for operating same |
| JPS5258005A (en) * | 1975-11-09 | 1977-05-13 | Kiyotoshi Sakai | Method for pressure control of shaft furnace |
| US4082253A (en) * | 1976-03-17 | 1978-04-04 | Air Pollution Industries, Inc. | Blast furnace pressure equalizing apparatus |
-
2011
- 2011-09-28 EP EP11183103A patent/EP2574873A1/en not_active Withdrawn
-
2012
- 2012-09-27 WO PCT/EP2012/069051 patent/WO2013045534A1/en not_active Ceased
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3549138A (en) * | 1968-10-08 | 1970-12-22 | James L Thomas | Method of pressure equalizing for blast furnace top |
| DE2306887A1 (en) * | 1973-02-13 | 1974-08-15 | Ignis Huettenbau Ag | Shaft furnace gas cleaning - with automatic by-pass of gas cleaning appts in event of appts failure |
| US4152123A (en) * | 1977-12-16 | 1979-05-01 | Gottfried Bischoff Bau Kompl. Gasreinigungs- Und Wasserruckkuhlanlagen Gmbh & Co. Kommanditgesellschaft | Gas-cleaning apparatus and method for high-pressure blast furnace |
| JPS5941407A (en) * | 1982-08-30 | 1984-03-07 | Mitsui Eng & Shipbuild Co Ltd | Dry dust separator for exhaust gas from blast furnace |
| JPS5974207A (en) * | 1982-10-21 | 1984-04-26 | Mitsui Eng & Shipbuild Co Ltd | Safety device of top pressure energy recovering device of blast furnace |
| JPS61152908A (en) * | 1984-12-26 | 1986-07-11 | Kawasaki Steel Corp | Device of recovering power by means of pressure gas |
| JPS63109109A (en) * | 1986-10-28 | 1988-05-13 | Nippon Steel Corp | Blast furnace gas cleaning equipment |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3159640A1 (en) | 2015-10-20 | 2017-04-26 | Danieli Corus BV | Cleaning furnace gas process and metal production plant |
| WO2017067862A1 (en) | 2015-10-20 | 2017-04-27 | Danieli Corus B.V. | Dry dust removal from furnace gas |
| EP3159640B1 (en) | 2015-10-20 | 2020-04-01 | Danieli Corus BV | Cleaning furnace gas process and metal production plant |
| US11397051B2 (en) | 2015-10-20 | 2022-07-26 | Danieli Corus B.V. | Dry dust removal from furnace gas |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2574873A1 (en) | 2013-04-03 |
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