CN112831621B - Blast furnace gas cooling system and cooling control method - Google Patents
Blast furnace gas cooling system and cooling control method Download PDFInfo
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- CN112831621B CN112831621B CN202110013559.8A CN202110013559A CN112831621B CN 112831621 B CN112831621 B CN 112831621B CN 202110013559 A CN202110013559 A CN 202110013559A CN 112831621 B CN112831621 B CN 112831621B
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- 238000001816 cooling Methods 0.000 title claims abstract description 122
- 238000000034 method Methods 0.000 title claims abstract description 48
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 133
- 239000000428 dust Substances 0.000 claims abstract description 54
- 238000010248 power generation Methods 0.000 claims abstract description 54
- 238000005507 spraying Methods 0.000 claims abstract description 49
- 238000007791 dehumidification Methods 0.000 claims abstract description 15
- 239000007789 gas Substances 0.000 claims description 196
- 239000007921 spray Substances 0.000 claims description 42
- 239000000498 cooling water Substances 0.000 claims description 15
- 230000009467 reduction Effects 0.000 claims description 9
- 230000000694 effects Effects 0.000 claims description 5
- 239000000945 filler Substances 0.000 claims description 5
- 238000003723 Smelting Methods 0.000 claims description 4
- 238000001179 sorption measurement Methods 0.000 claims description 3
- 239000002918 waste heat Substances 0.000 claims description 3
- 239000013589 supplement Substances 0.000 claims description 2
- 238000007599 discharging Methods 0.000 claims 1
- 238000010992 reflux Methods 0.000 claims 1
- 239000003034 coal gas Substances 0.000 abstract description 28
- 230000008569 process Effects 0.000 abstract description 17
- 229910000831 Steel Inorganic materials 0.000 abstract description 10
- 239000010959 steel Substances 0.000 abstract description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 239000004744 fabric Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/10—Cooling; Devices therefor
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/22—Dust arresters
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- 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
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- Y02P10/25—Process efficiency
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Abstract
The invention relates to the technical field of high-efficiency application of metallurgical gas in the steel industry, in particular to a blast furnace gas cooling system and a cooling control method. The method comprises the following steps that coal gas of a blast furnace is connected with a furnace top spraying device, the furnace top spraying device is connected with a dry dust removal device, the dry dust removal device is connected with a TRT power generation device and a bypass pressure reducing valve bank, the bypass pressure reducing valve bank is connected with a bypass spraying device, the bypass spraying device is connected with a dehumidification device, the TRT power generation device is connected with the dehumidification device and a coal gas cooling tower, and the coal gas cooling tower is connected with an inlet of a CCPP power generation device; the coal gas cooling tower is connected with the circulating water cooling tower, the circulating water cooling tower is connected with the circulating water pool, and the circulating water pool is connected with the coal gas cooling tower. The method realizes effective cooling of the blast furnace gas, meets the requirement of the CCPP generator set on the blast furnace gas temperature under the matching of the early wet dust removal process, and solves the restriction bottleneck of changing the wet dust removal method into the dry dust removal method for the blast furnace gas in the steel industry.
Description
Technical Field
The invention relates to the technical field of high-efficiency application of metallurgical gas in the steel industry, in particular to a blast furnace gas cooling system and a cooling control method.
Background
The blast furnace gas dust removal process of the iron and steel enterprises is divided into dry dust removal and wet dust removal. The dust removal process of the large blast furnace gas put into production at early stage in China basically adopts a wet dust removal mode, part of gas excess pressure and residual heat energy can be lost in the wet dust removal process, sewage ring water for gas washing is difficult to treat, small particles can be circulated and enriched in a sewage ring water treatment system, and finally discharged outside to cause secondary environmental pollution. With the improvement of the cloth bag technology in recent years, the problem that the cloth bag is easy to damage at the furnace top temperature of 180-300 ℃ is solved, and the dry dust removal becomes the first choice of the blast furnace gas dust removal mode of various large steel plants. Compared with the wet method, the dry method dust removal method has the advantages that not only can the pressure energy of blast furnace gas be fully utilized, but also the sensible heat of the gas is fully utilized, so that the energy which can be recovered by the TRT device is greatly increased. However, the CCPP generator set matched with the original wet dust removal is designed according to the temperature of blast furnace gas after the wet dust removal at the beginning of design, and the temperature of the inlet gas is required to be about 35-40 ℃, particularly, in the early large CCPP generator set, for example, a saddle steel 300MW large CCPP generator set, the temperature of the inlet blast furnace gas is required to be not higher than 35 ℃, and the CCPP cannot run at full load to reduce the power generation. Therefore, although the wet method for blast furnace gas dust removal is changed into the dry method, the TRT power generation can be improved, if the problem that the temperature of blast furnace gas is too high cannot be solved, the CCPP power generation is influenced, which is irrevocable and also is a main reason for restricting a plurality of iron and steel enterprises from being incapable of carrying out dry method modification on blast furnace gas. Therefore, it is necessary to study the temperature reduction of blast furnace gas under dry dedusting to meet the requirements of the subsequent CCPP operation. At present, a plurality of researches and applications are carried out for cooling blast furnace gas at home and abroad.
CN107604116A discloses a blast furnace gas treatment system and a treatment method thereof, which controls the gas temperature through a TRT power generation device, and although the gas temperature can be controlled in a certain range, the gas temperature is controlled at the expense of the power generation efficiency and is irrevocably controversial. CN105950226A discloses a "vertical gas spraying, cooling and dewatering integrated system", which utilizes water atomized water to spray and cool high-temperature gas and wash acidic substances and salt, and then rotates the gas containing mechanical water in a vertical gas dewatering device to remove mechanical water drops, but the temperature of the blast furnace gas is difficult to be reduced to about 35-40 ℃ by the pipeline spraying and cooling method. CN201525851U discloses a "gas cooling device for a blast furnace gas dry dedusting process". The device sprays atomized cooling water into a pipeline through a double-medium atomizing nozzle arranged on a blast furnace gas pipeline to cool the blast furnace gas, so that the blast furnace gas enters a dry-method dust remover and does not burn filter materials in the dust remover; but the device does not consider the requirements of subsequent gas users on the gas temperature.
In summary, the blast furnace gas cooling system and the cooling control method have some problems. The blast furnace gas cooling system and the cooling control method can not effectively cool the blast furnace gas to about 35 ℃ after the original wet dust removal process is transformed into the dry dust removal process, so that the temperature requirement of a CCPP generator set matched with the early wet dust removal process can be met. Therefore, it is necessary to find a more practical and effective blast furnace gas cooling system and cooling control method.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a blast furnace gas cooling system and a cooling control method. The blast furnace gas is effectively cooled, the requirement of a CCPP power generation unit on the temperature of the blast furnace gas under the matching of an early wet dust removal process is met, and the restriction bottleneck of changing the wet dust removal method into the dry dust removal method of the blast furnace gas in the steel industry is solved.
In order to achieve the purpose, the invention adopts the following technical scheme:
a blast furnace gas cooling system comprises a furnace top spraying device, a dry dust removal device, a TRT power generation device, a bypass pressure reducing valve set, a bypass spraying device, a dehumidification device, a gas cooling tower, a circulating water cooling tower and a circulating water pool;
the devices are connected through pipelines, a gas outlet of the blast furnace is connected with a furnace top spraying device, the gas outlet of the furnace top spraying device is connected with an inlet of a dry dust removal device, the gas outlet of the dry dust removal device is connected with a TRT power generation device and an inlet of a bypass pressure reducing valve set, an outlet of the bypass pressure reducing valve set is connected with a bypass spraying device, the gas outlet of the bypass spraying device is connected with an inlet of a dehumidification device, the gas outlet of the TRT power generation device and the dehumidification device is connected with a gas inlet of a gas cooling tower, and the gas outlet of the gas cooling tower is connected with an inlet of a CCPP power generation device; the cooling water outlet of the coal gas cooling tower is connected with the inlet of the circulating water cooling tower, the outlet of the circulating water cooling tower is connected with the inlet of the circulating water pool, and the outlet of the circulating water pool is connected with the cooling water inlet of the coal gas cooling tower.
The device also comprises a valve and a water pump. The water pump is arranged on a connecting pipeline between the outlet of the circulating water tank and the cooling water inlet of the coal gas cooling tower.
A blast furnace gas cooling control method specifically comprises two operation states, namely a TRT power generation device operation state and a TRT power generation device stop operation state;
under the operation state of the TRT power generation device:
the temperature of blast furnace gas generated in blast furnace smelting is generally above 220 ℃, and can change along with the fluctuation of the condition of the blast furnace, the blast furnace gas enters a furnace top spraying device, if the temperature is higher than 180-200 ℃, the blast furnace gas is sprayed and cooled, and sprayed fog drops absorb the sensible heat of the blast furnace gas and are vaporized into water vapor so as to achieve the purpose of cooling the blast furnace gas; if the temperature is not higher than 180-200 ℃, the spraying temperature reduction is not carried out.
The water content of blast furnace gas at the outlet of a common furnace top spraying device is 10g/Nm 3 ～35g/Nm 3 (ii) a The furnace top spraying device ensures that the temperature of blast furnace gas is lower than 180-200 ℃ and enters the dry dust removal device to prevent the cloth bag filter material in the dry dust removal device from being burnt out due to overhigh temperature of the gas.
The blast furnace gas enters a TRT power generation device after being dedusted by a dry dedusting device, the residual pressure waste heat is utilized for power generation, the temperature of the blast furnace gas after being discharged from the TRT power generation device is generally in the range of 60-80 ℃, the blast furnace gas flows upwards from the bottom of a gas cooling tower and carries out countercurrent heat exchange with spray water on the upper part of the gas cooling tower, the blast furnace gas is cooled by utilizing the sensible heat of the spray water, and the temperature of the blast furnace gas is reduced to below 35 ℃ by controlling the water quantity of the spray water; the temperature of spray water is raised to 30 ℃ after heat exchange, the spray water enters a circulating water cooling tower from a waterway outlet at the bottom of the gas cooling tower, is cooled to 25 ℃ by the cooling tower and flows into a circulating water tank, and then cooling water in the circulating water tank is circularly pumped into the gas cooling tower by a water pump to cool blast furnace gas.
In the stop operation state of the TRT power generation device:
the temperature of blast furnace gas generated in blast furnace smelting is generally above 220 ℃; the generated blast furnace gas enters a furnace top spraying device, and if the temperature is higher than 180-200 ℃, spraying and cooling are carried out; if the temperature is not higher than 180-200 ℃, the spraying temperature reduction is not carried out.
The water content of the blast furnace gas at the outlet of the common furnace top spraying device is 10g/Nm 3 ～35g/Nm 3 (ii) a The furnace top spraying device ensures that the temperature of blast furnace gas is lower than 180-200 ℃ and enters a dry dust removal device; the blast furnace gas after dust removal by the dry dust removal device enters a bypass pressure reducing valve set to be reduced in pressure, then enters a bypass spraying device to be cooled, the sprayed and atomized water drops absorb the heat of the blast furnace gas to be vaporized into water vapor, and the blast furnace gas is cooled to be within the range of 100-120 ℃.
The water content of the blast furnace gas after temperature reduction is 50g/Nm 3 ～80g/Nm 3 The pressure is 13 Kp-16 Kp, and the corresponding dew point temperature is 38-47 ℃; if the blast furnace gas in the state directly enters the gas cooling tower to be cooled to 35 ℃ and can be cooled to below the dew point temperature of the blast furnace gas, most of the cold energy provided by the circulating water of the gas cooling tower is used for latent heat cold absorption of water by water vapor cooling, and the amount of the circulating water is expected to be increased by 25-90%.
In order to ensure that the difference between the circulating water amount of the gas cooling tower in the running state and the fault state of the TRT power generation device is not large, the blast furnace gas enters a dehumidifying device after being subjected to spray cooling by a bypass, the dehumidifying device is filled with high-molecular polyethylene material, water vapor in the gas can be adsorbed, the adsorption efficiency reaches more than 80 percent, and the water content of the blast furnace gas passing through the dehumidifying device is reduced to 10g/Nm 3 ～16g/Nm 3 The dew point temperature is lower than 35 ℃.
The dehumidified blast furnace gas flows upwards from the bottom of the gas cooling tower and carries out countercurrent heat exchange with spray water on the upper part of the gas cooling tower, the blast furnace gas is cooled by utilizing sensible heat of the spray water, and the gas temperature is reduced to below 35 ℃ by controlling the water amount of the spray water; the temperature of spray water is 25 ℃, the temperature of the spray water is raised to 30 ℃ after heat exchange, the spray water enters a circulating water cooling tower from a waterway outlet at the bottom of the gas cooling tower, the spray water is cooled to 25 ℃ through the cooling tower and flows into a circulating water tank, and then cooling water in the circulating water tank is circularly pumped into the gas cooling tower by a water pump to cool blast furnace gas.
After the filler in the dehumidifying device absorbs the water vapor, the dehumidifying effect is gradually reduced along with the increase of the water content; when the dehumidification efficiency is lower than 80 percent and the blast furnace gas can be normally operated in the TRT power generation device without bypassing, the filler in the dehumidification device is desorbed to recover the adsorption effect, and the desorbed water is discharged through a water drainer or can be returned to a circulating water pool as the water supplement.
Compared with the prior art, the invention has the beneficial effects that:
by using the TRT bypass spraying device and the filler dehumidifying device, the temperature and the moisture content of the coal gas entering the coal gas cooling tower are controlled, the cooling effect of the coal gas cooling tower on the temperature of the blast furnace coal gas to be reduced to 35 ℃ is ensured, and the operation stability and the reliability of the whole coal gas cooling system are improved. The CCPP generator set meets the requirement on the temperature of the blast furnace gas under the matching of the early wet dust removal process, and the restriction bottleneck of changing the wet dust removal process of the blast furnace gas into the dry dust removal process in the steel industry is solved.
Drawings
FIG. 1 is a schematic diagram of the structure and process of the present invention.
In the figure:
1. the system comprises a blast furnace, 2, a furnace top spraying device, 3, a dry dust removal device, 4, a TRT power generation device, 5, a bypass pressure reducing valve bank, 6, a bypass spraying device, 7, a dehumidification device, 8, a coal gas cooling tower, 9, a circulating water cooling tower, 10, a circulating water pool, 11, a CCPP power generation device, 12, a water pump and 13, 14, 15 and 16 switch valves.
Detailed Description
The invention discloses a blast furnace gas cooling system and a cooling control method. Those skilled in the art can modify the process parameters appropriately to achieve the desired results with reference to the disclosure herein. It is expressly intended that all such similar substitutes and modifications which would be obvious to one skilled in the art are deemed to be included in the invention. While the methods and applications of this invention have been described in terms of preferred embodiments, it will be apparent to those of ordinary skill in the art that variations and modifications in the methods and applications described herein, as well as other suitable variations and combinations, may be made to implement and use the techniques of this invention without departing from the spirit and scope of the invention.
A blast furnace gas cooling system comprises a furnace top spraying device 2, a dry dust removal device 3, a bypass pressure reducing valve group 5, a bypass spraying device 6, a dehumidification device 7, a gas cooling tower 8, a circulating water cooling tower 9, a circulating water pool 10, connecting pipelines among the devices, switch valves 13, 14, 15 and 16 and a water pump 12.
The coal gas outlet of the blast furnace 1 is connected with the furnace top spraying device 2 through a pipeline, the coal gas outlet of the furnace top spraying device 2 is connected with the inlet of the dry dust removal device 3 through a pipeline, the coal gas outlet of the dry dust removal device 3 is connected with the inlets of the TRT power generation device 4 and the bypass pressure reducing valve bank 5 through pipelines, and the outlet of the bypass pressure reducing valve bank 5 is connected with the bypass spraying device 6 through a pipeline.
The coal gas outlet of the bypass spraying device 6 is connected with the inlet of the dehumidifying device 7 through a pipeline, the TRT power generating device 4 and the coal gas outlet of the dehumidifying device 7 are connected with the coal gas inlet of the coal gas cooling tower 8 through pipelines, and the coal gas outlet of the coal gas cooling tower 8 is connected with the inlet of the CCPP power generating device 11 through a pipeline.
The cooling water outlet of the gas cooling tower 8 is connected with the inlet of a circulating water cooling tower 9 through a pipeline, the outlet of the circulating water cooling tower 9 is connected with the inlet of a circulating water pool 10 through a pipeline, the outlet of the circulating water pool 10 is connected with the cooling water inlet of the gas cooling tower 8 through a pipeline, and a water pump 12 is arranged on the pipeline connecting the outlet of the circulating water pool 10 and the cooling water inlet of the gas cooling tower 8.
Example 1:
a blast furnace gas cooling control method specifically comprises two operation states, namely a TRT power generation device operation state.
Under the operation state of the TRT power generation device:
in the TRT power generation apparatus operating state, the on-off valves 15 and 16 are in the open state, and the on-off valves 13 and 14 are in the closed state. The temperature of blast furnace gas generated in a blast furnace 1 is 250 ℃, the blast furnace gas enters a furnace top spraying device 2, the furnace top spraying device 2 sprays and atomizes water with the temperature of 25 ℃, and sprayed fog drops absorb the sensible heat of the blast furnace gas and are vaporized into water vapor to reach the aim ofThe blast furnace gas is cooled to 190 ℃, and the water content of the blast furnace gas at the outlet of the furnace top spraying device 2 is 29g/Nm 3 Left and right;
after the temperature is reduced, the blast furnace gas is dedusted by a dry dedusting device 3 and then enters a TRT power generation device 4, the residual pressure and the waste heat are utilized for power generation, and the temperature of the blast furnace gas after the blast furnace gas is discharged from the TRT power generation device 4 is 70 ℃; blast furnace gas at 70 ℃ flows upwards from the bottom of the gas cooling tower 8 and carries out countercurrent heat exchange with spray water on the upper part of the gas cooling tower 8, the blast furnace gas is cooled by utilizing sensible heat of the spray water to reduce the temperature of the gas to below 35 ℃, and the cooled blast furnace gas is supplied to a CCPP power generation device 11 for power generation.
The temperature of spray water in the gas cooling tower 8 is 25 ℃, the temperature of the spray water is raised to 30 ℃ after heat exchange, the spray water enters a circulating water cooling tower 9 from a water channel at the bottom of the gas cooling tower 8, the spray water is cooled to 25 ℃ through the cooling tower and flows into a circulating water pool 10, and cooling water in the circulating water pool 10 circularly enters the gas cooling tower 8 through a water pump 12 to cool blast furnace gas.
Example 2:
a blast furnace gas cooling control method specifically comprises two operation states, namely a TRT power generation device stop operation state.
In the stop state of the TRT power generation device:
in the stop state of the TRT power generation apparatus, the on-off valves 13 and 14 are in the open state, and the on-off valves 15 and 16 are in the closed state. The temperature of blast furnace gas generated in a blast furnace 1 is 220 ℃, the blast furnace gas enters a furnace top spraying device 2, the spraying device sprays and atomizes water with the temperature of 25 ℃, sprayed fog drops absorb the sensible heat of the blast furnace gas and are vaporized into water vapor to achieve the purpose of cooling the blast furnace gas, the temperature of the blast furnace gas is reduced to 180 ℃, and the water content of the blast furnace gas at the outlet of the furnace top spraying device 2 is 20g/Nm 3 Left and right.
The cooled blast furnace gas is dedusted by a dry dedusting device 3, then enters a bypass pressure reducing valve group 5 for pressure reduction, and then enters a bypass spraying device 6 for cooling, and atomized and sprayed water drops absorb the heat of the blast furnace gas and are vaporized into steam to cool the blast furnace gas to 110 ℃; the water content of the blast furnace gas after temperature reduction is 56g/Nm 3 The pressure is 16Kp, and the corresponding dew point temperature is about 40.6 ℃.
The blast furnace gas after being sprayed and cooled enters a dehumidifying device 7 to remove water vapor in the gas, the dehumidifying efficiency reaches more than 80 percent, and the water content of the blast furnace gas after passing through the dehumidifying device 7 is reduced to 11g/Nm 3 The dew point temperature is lower than 20 ℃.
The dehumidified blast furnace gas flows upwards from the bottom of the gas cooling tower 8 and carries out countercurrent heat exchange with spray water on the upper part of the gas cooling tower 8, the blast furnace gas is cooled by sensible heat of the spray water to reduce the temperature of the gas to below 35 ℃, and the cooled blast furnace gas is supplied to a CCPP power generation device 11 for power generation.
The temperature of the spray water is 25 ℃, the temperature of the spray water is raised to 30 ℃ after heat exchange, the spray water enters a circulating water cooling tower 9 from a water channel outlet at the bottom of the gas cooling tower 8, the spray water is cooled to 25 ℃ through the cooling tower and flows into a circulating water pool 10, and cooling water in the circulating water pool 10 circularly enters the gas cooling tower 8 through a water pump 12 to circularly cool the blast furnace gas.
According to the invention, through the use of the TRT bypass spraying device 6 and the filler dehumidifying device 7, the temperature and the moisture content of the coal gas entering the coal gas cooling tower 8 are controlled, the cooling effect of the coal gas cooling tower 8 on the temperature of the blast furnace coal gas reduced to 35 ℃ is ensured, and the operation stability and the reliability of the whole coal gas cooling system are improved. The CCPP power generation unit meets the requirement of the blast furnace gas temperature under the matching of the early wet dust removal process, and solves the restriction bottleneck of changing the wet dust removal process of the blast furnace gas into the dry dust removal process in the steel industry.
The invention solves the problem that the blast furnace gas temperature is not matched with the requirement of the CCPP power generation device after the blast furnace gas wet dust removal is changed into the dry dust removal, realizes the cooling of the blast furnace gas to 35 ℃, and ensures the requirement of the CCPP power generation device on the blast furnace gas temperature.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered as the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.
Claims (1)
1. The blast furnace gas cooling control method is characterized in that the system comprises a furnace top spraying device, a dry dust removal device, a bypass pressure reducing valve bank, a bypass spraying device, a dehumidification device, a gas cooling tower, a circulating water cooling tower and a circulating water pool;
the devices are connected through pipelines, a gas outlet of the blast furnace is connected with a furnace top spraying device, the gas outlet of the furnace top spraying device is connected with an inlet of a dry dust removal device, the gas outlet of the dry dust removal device is connected with a TRT power generation device and an inlet of a bypass pressure reducing valve set, an outlet of the bypass pressure reducing valve set is connected with a bypass spraying device, the gas outlet of the bypass spraying device is connected with an inlet of a dehumidification device, the gas outlet of the TRT power generation device and the dehumidification device is connected with a gas inlet of a gas cooling tower, and the gas outlet of the gas cooling tower is connected with an inlet of a CCPP power generation device; a cooling water outlet of the gas cooling tower is connected with an inlet of a circulating water cooling tower, an outlet of the circulating water cooling tower is connected with an inlet of a circulating water pool, and an outlet of the circulating water pool is connected with a cooling water inlet of the gas cooling tower;
the gas cooling tower is characterized by also comprising a valve and a water pump, wherein the water pump is arranged on a connecting pipeline between an outlet of the circulating water pool and a cooling water inlet of the gas cooling tower;
the method specifically comprises two running states, namely a TRT power generation device running state and a TRT power generation device running stopping state;
1) Under the operation state of the TRT power generation device:
if the temperature of blast furnace gas generated in blast furnace smelting is 200-250 ℃, carrying out spray cooling, and if the temperature is lower than 200 ℃, not carrying out spray cooling; the water content of blast furnace gas at the outlet of the furnace top spraying device is 10g/Nm 3 ～29g/Nm 3 ；
Blast furnace gas with the temperature lower than 200 ℃ after being subjected to spray cooling enters a dry dust removal device, the blast furnace gas subjected to dust removal by the dry dust removal device enters a TRT power generation device, power generation is carried out by utilizing residual pressure waste heat, the temperature of the blast furnace gas after coming out of the TRT power generation device is in a range of 60-80 ℃, the blast furnace gas flows upwards from the bottom of a gas cooling tower and carries out countercurrent heat exchange with spray water on the upper part of the gas cooling tower, and the temperature of the gas is reduced to below 35 ℃ by controlling the water amount of the spray water;
2) In the stop operation state of the TRT power generation device:
if the temperature of blast furnace gas generated in blast furnace smelting is 200-220 ℃, carrying out spray cooling, and if the temperature is lower than 200 ℃, not carrying out spray cooling; the water content of blast furnace gas at the outlet of the furnace top spraying device is 10g/Nm 3 ～20g/Nm 3 ；
The blast furnace gas with the temperature lower than 200 ℃ after being cooled by spraying enters a dry dust removal device, the blast furnace gas after being removed dust by the dry dust removal device enters a bypass pressure reducing valve group for pressure reduction, then the blast furnace gas enters a bypass spraying device for temperature reduction, the sprayed and atomized water drops absorb the heat of the blast furnace gas and are vaporized into steam, and the blast furnace gas is cooled to the temperature of 100-120 ℃;
the water content of the blast furnace gas after temperature reduction is 50g/Nm 3 ～80g/Nm 3 The pressure is 13 kPa-16 kPa, and the corresponding dew point temperature is 38-47 ℃; the blast furnace gas enters a dehumidifying device after the bypass spray cooling, and the water content of the blast furnace gas after passing through the dehumidifying device is reduced to 10g/Nm 3 ～16g/Nm 3 The dew point temperature is lower than 35 ℃;
the dehumidified blast furnace gas flows upwards from the bottom of the gas cooling tower and carries out countercurrent heat exchange with spray water on the upper part of the gas cooling tower, the blast furnace gas is cooled by utilizing the sensible heat of the spray water, and the temperature of the blast furnace gas is reduced to below 35 ℃ by controlling the water amount of the spray water;
the TRT power generation device running state and the TRT power generation device stop running state are as follows: the temperature of spray water is raised to 30 ℃ after heat exchange, the spray water enters a circulating water cooling tower from a waterway outlet at the bottom of the gas cooling tower, is cooled to 25 ℃ through the cooling tower and flows into a circulating water pool, and then cooling water in the circulating water pool is circularly pumped into the gas cooling tower by a water pump to cool blast furnace gas;
and when the blast furnace gas does not bypass during the normal operation of the TRT power generation device, when the dehumidification efficiency of the dehumidification device is lower than 80%, desorbing the filler in the dehumidification device to recover the adsorption effect, and discharging the desorbed water through a drainer or refluxing the desorbed water into a circulating water pool as water supplement.
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| JP3956834B2 (en) * | 2002-10-29 | 2007-08-08 | Ｊｆｅスチール株式会社 | Blast furnace gas dust collection method |
| CN101074453A (en) * | 2006-09-13 | 2007-11-21 | 童裳慧 | Efficient economical dust collecting method and dust collector for iron-smelting blast furnace |
| CN101603107B (en) * | 2009-07-14 | 2011-04-20 | 河北省首钢迁安钢铁有限责任公司 | System for removing corrosive substances in coal gas obtained by dry dedusting of blast furnace and process thereof |
| CN202465752U (en) * | 2012-02-29 | 2012-10-03 | 中冶赛迪工程技术股份有限公司 | Dry process dust removing device of blast furnace gas |
| CN103205516B (en) * | 2013-04-03 | 2015-05-06 | 北京首钢股份有限公司 | Method and device for desalting blast furnace gas |
| CN203295518U (en) * | 2013-06-08 | 2013-11-20 | 佰利天控制设备（北京）有限公司 | Blast-furnace gas centralized processing system and iron making blast furnace with same |
| CN203668429U (en) * | 2013-09-14 | 2014-06-25 | 上海梅山钢铁股份有限公司 | Pressure, vibration and noise reduction device for high coal pipe network of large blast furnace |
| CN107385130A (en) * | 2017-07-17 | 2017-11-24 | 常州大学 | A kind of blast furnace gas purification technique |
| CN208406508U (en) * | 2018-05-14 | 2019-01-22 | 苏州百润环保设备有限公司 | A kind of efficiency of waste gas condensing unit |
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