CN110938723A - Pressure-equalizing gas self-cleaning purification and full-recovery process for blast furnace top charging bucket - Google Patents
Pressure-equalizing gas self-cleaning purification and full-recovery process for blast furnace top charging bucket Download PDFInfo
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- CN110938723A CN110938723A CN201911145015.6A CN201911145015A CN110938723A CN 110938723 A CN110938723 A CN 110938723A CN 201911145015 A CN201911145015 A CN 201911145015A CN 110938723 A CN110938723 A CN 110938723A
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- 238000011084 recovery Methods 0.000 title claims abstract description 82
- 238000004140 cleaning Methods 0.000 title claims abstract description 19
- 238000000746 purification Methods 0.000 title claims abstract description 10
- 239000000428 dust Substances 0.000 claims abstract description 40
- 239000002131 composite material Substances 0.000 claims abstract description 15
- 239000004744 fabric Substances 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 claims description 29
- 239000003034 coal gas Substances 0.000 claims description 24
- 238000004891 communication Methods 0.000 claims description 10
- 238000007789 sealing Methods 0.000 claims description 10
- 239000003566 sealing material Substances 0.000 claims description 10
- 238000001514 detection method Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 7
- 238000007599 discharging Methods 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 2
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 238000002347 injection Methods 0.000 abstract description 2
- 239000007924 injection Substances 0.000 abstract description 2
- 230000007613 environmental effect Effects 0.000 description 3
- 238000003915 air pollution Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000630 rising effect Effects 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
- C21B7/007—Controlling or regulating of the top pressure
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- 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
- C21B7/22—Dust arresters
-
- 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
- C21B2100/40—Gas purification of exhaust gases to be recirculated or used in other metallurgical processes
- C21B2100/44—Removing particles, e.g. by scrubbing, dedusting
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Blast Furnaces (AREA)
Abstract
The invention discloses a self-cleaning purification and full recovery process of blast furnace top charging bucket pressure-sharing gas, which utilizes the pressure difference between high-pressure gas and low-pressure gas pipe network in the charging bucket to carry out natural recovery, the high-pressure gas and the low-pressure gas pipe network are filtered by a top gas recovery cyclone cloth bag composite dust collector and then are merged into the low-pressure clean gas pipe network, 80 percent of pressure-sharing gas in the recovery charging bucket is recovered, a forced injection recoverer is opened to carry out forced recovery on the residual gas in a charging bucket at the end of natural recovery of the gas, the residual gas in the recovery charging bucket is transferred to the low-pressure gas pipe network, and the 100 percent recovery of pressure-sharing gas in the charging bucket is achieved, so; the top of the blast furnace is provided with the cyclone cloth bag composite dust collector, the dust collection efficiency is high, the self-cleaning type dust cleaning function is realized through the pressure-equalizing clean gas, the energy consumption is reduced, the automation degree of the recovery process is high, the full-automatic unmanned control can be realized through the PLC, and the occupied area and the project investment can be reduced.
Description
Technical Field
The invention relates to the field of environmental protection, in particular to a self-cleaning purification and full recovery process for pressure-equalizing coal gas of a charging bucket at the top of a blast furnace.
Background
In recent years, with the rising concern of people on environmental protection and climate, low-carbon, clean and efficient enterprises are bound to be built, in the process of blast furnace smelting production, high-pressure gas in a charging bucket needs to be decompressed and diffused before charging of a blast furnace charging bucket, a diffusing valve is opened in the traditional diffusing mode, dust-containing high-pressure gas in the charging bucket is directly discharged to the air through a diffusing pipe, noise is generated in the diffusing process, a large amount of blast furnace gas and dust are discharged, multiple pollution is caused to the environment, and a large amount of gas energy is wasted in vain.
According to the latest standard and the environmental protection requirement, the top of the blast furnace is provided with a top pressure discharge coal gas recovery device. Therefore, in order to recover energy and improve the environment, simultaneously eliminate the noise of the furnace top and improve the maintenance condition of the furnace top equipment, the furnace top pressure equalizing and bleeding system is required to be provided with a pressure equalizing gas recovery system.
Disclosure of Invention
The invention aims to provide a self-cleaning purification and full recovery process for pressure-equalizing coal gas of a charging bucket at the top of a blast furnace.
The technical scheme adopted by the invention is as follows:
the self-cleaning purification and full recovery process of pressure-equalizing coal gas of a blast furnace top charging bucket is characterized in that: the method comprises the following steps:
step 1: opening a sealing material-intercepting valve on the blast furnace burden tank, and allowing the blast furnace burden to fall into the blast furnace burden tank, wherein the pressure in the blast furnace burden tank is equal to the atmospheric pressure;
step 2: after the charging of the blast furnace charging bucket is finished, closing the upper sealing material intercepting valve, and opening the pressure equalizing valve to pressurize the charging bucket by clean gas;
and step 3: when the pressure in the material tank is equal to the pressure in the blast furnace, pressure equalization is completed, the lower sealing material-intercepting valve of the material tank is opened, and after the furnace burden falls into the blast furnace, the lower sealing material-intercepting valve is closed;
and 4, step 4: starting a recovery system, opening a natural recovery valve, and allowing high-pressure coal gas in the material tank to enter a low-pressure coal gas pipe network through a coal gas recovery pipeline, the natural recovery valve, a check valve, a manual butterfly valve and a manual blind plate valve after being filtered by a furnace top cyclone cloth bag composite dust collector;
and 5: after the gas is naturally recovered, when the pressure detection shows that the pressure of the gas recovery pipeline is equal to the pressure of a low-pressure gas pipe network, closing a natural recovery valve, simultaneously opening a forced recovery valve behind a forced recovery ejector and a communication valve in front of the forced recovery ejector, forming high-speed airflow in the forced recovery ejector through the pressure-equalizing gas with higher pressure to generate negative pressure, and forcibly recovering the residual gas in the material tank to the low-pressure gas pipe network through the communication valve to realize 100% recovery of the pressure-equalizing gas;
step 6: when the pressure detection detects that the pressure in the material tank is reduced to be consistent with the atmospheric pressure, the forced recovery valve and the communication valve are closed to complete the recovery of the gas in the material tank for the first time, and a check valve is added on the gas recovery pipeline in order to prevent the gas in the low-pressure pipe network from flowing backwards;
and 7: opening a material tank upper sealing material intercepting valve, enabling the material tank to enter the next charging procedure, closing the material tank upper sealing material intercepting valve after charging is finished, and opening a gas pressure equalizing valve, wherein high-pressure clean gas is used for taking dust deposited on the surface of a filter bag in the cyclone cloth bag composite dust collector into the material tank through a dust discharging valve sent by a dust hopper, so that self-cleaning type dust cleaning of the cyclone cloth bag composite dust collector is realized;
and 8: the recovery process is carried out repeatedly, and the blast furnace charge gas filling recovery is completed each time.
And the dust concentration detection is arranged on the recovery pipeline and is used for detecting whether the dust concentration of the recovered coal gas entering the low-pressure coal gas pipe network is qualified or not.
The manual butterfly valve and the manual blind plate valve are opened when the system operates normally, and are closed when other valves and equipment are overhauled, and coal gas is cut off.
The invention has the advantages that: the pressure-equalizing coal gas of the blast furnace top charging bucket is purified and is fully recovered by 100 percent, the energy waste is saved, the air pollution is reduced, the original diffused noise is eliminated, the cyclone cloth bag composite dust collector is arranged on the blast furnace top, the dust collection efficiency is high, the self-cleaning type dust cleaning function can be realized through the pressure-equalizing clean coal gas, the energy consumption is reduced, the automation degree of the recovery process is high, the full-automatic unmanned control can be realized through PLC, and compared with other blast furnace top charging bucket coal gas recovery processes, the occupied area and the project investment can be reduced.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic structural diagram of the present invention.
Wherein: 1. a natural recovery valve; 2. a forced recovery valve; 3. a communication valve; 4. forcibly recovering the ejector; 5. a bleed valve; 6. a pressure equalizing valve; 7. a check valve; 8. a manual butterfly valve; 9. a manual blind plate valve; 10. a cyclone cloth bag composite dust collector; 11. an ash discharge valve; 12. an upper sealing material stopping valve; 13. a lower sealing material-stopping valve; 14. detecting pressure; 15. detecting the dust concentration; 16. a gas recovery pipeline; 17. low pressure gas pipe network.
Detailed Description
As shown in figure 1, the blast furnace top charging bucket pressure-equalizing gas self-cleaning purification and full recovery process comprises the following steps:
step 1: opening the sealing material-intercepting valve 12 on the blast furnace burden tank, and allowing the blast furnace burden to fall into the blast furnace burden tank, wherein the pressure in the blast furnace burden tank is equal to the atmospheric pressure;
step 2: after the charging of the blast furnace charging bucket is finished, closing the upper sealing material intercepting valve 12, and opening the pressure equalizing valve 6 to pressurize the charging bucket by using clean coal gas;
and step 3: when the pressure in the material tank is equal to the pressure in the blast furnace, the pressure equalization is completed, the lower sealing material-intercepting valve 13 of the material tank is opened, and after the furnace burden falls into the blast furnace, the lower sealing material-intercepting valve 13 is closed;
and 4, step 4: starting a recovery system, opening a natural recovery valve 1, filtering high-pressure gas in a material tank through a furnace top cyclone cloth bag composite dust collector 10, and then entering a low-pressure gas pipe network 17 through a gas recovery pipeline 16, the natural recovery valve 1, a check valve 7, a manual butterfly valve 8 and a manual blind plate valve 9;
and 5: after the gas is naturally recovered, when the pressure detection 14 shows that the pressure of the gas recovery pipeline 16 is equal to the pressure of a low-pressure gas pipe network, closing the natural recovery valve 1, simultaneously opening the forced recovery valve 2 behind the forced recovery ejector 4 and the communication valve 3 in front of the forced recovery ejector 4, forming high-speed airflow in the forced recovery ejector 4 through the pressure-equalizing gas with higher pressure to generate negative pressure, and forcibly recovering the residual gas in the material tank to the low-pressure gas pipe network through the communication valve 3 to realize 100% recovery of the pressure-equalizing gas;
step 6: when the pressure detection 14 detects that the pressure in the material tank is reduced to be consistent with the atmospheric pressure, the forced recovery valve 2 and the communication valve 3 are closed to complete the recovery of the gas in the material tank for one time, and a check valve 7 is additionally arranged on a gas recovery pipeline in order to prevent the gas in a low-pressure pipe network from flowing backwards;
and 7: opening the material tank upper sealing material intercepting valve 12, enabling the charging bucket to enter the next charging procedure, closing the material tank upper sealing material intercepting valve 12 after charging is finished, and opening the gas pressure equalizing valve 6, wherein high-pressure clean gas brings dust deposited on the surface of a filter bag in the cyclone cloth bag composite dust collector 10 into the charging bucket through the dust discharging valve 11 issued by the dust hopper, so that self-cleaning type dust removal of the cyclone cloth bag composite dust collector is realized;
and 8: the recovery process is carried out repeatedly, and the blast furnace charge gas filling recovery is completed each time.
The dust concentration detection 15 is arranged on the recovery pipeline and is used for detecting whether the dust concentration of the recovered coal gas entering the low-pressure coal gas pipe network is qualified or not.
The manual butterfly valve 8 and the manual blind plate valve 9 are opened when the system normally operates, and are closed when other valves and equipment are overhauled, and coal gas is cut off.
The invention utilizes the pressure difference between high-pressure gas (pressure 180-220 KPa) and low-pressure gas pipe network (pressure 10-25 KPa) in the charging bucket to carry out natural recovery, the high-pressure gas and the low-pressure gas pipe network are filtered by a cyclone cloth bag composite dust collector for recovering the top gas and then are merged into a low-pressure clean gas pipe network, 80 percent of pressure-equalizing gas in the charging bucket can be recovered at the stage, a forced injection recoverer is opened to carry out forced recovery on the residual gas in a charging bucket at the end of natural recovery of the gas, the residual gas in the charging bucket is recycled to the low-pressure gas pipe network to achieve 100 percent recovery of the pressure-equalizing gas in the charging bucket, the pressure-equalizing gas in the top of the blast furnace is purified and fully recovered by 100 percent, the energy waste is saved, the air pollution is reduced, the original diffused noise is eliminated, the cyclone cloth bag composite dust collector is arranged on the top of the blast furnace, the energy consumption is reduced, the automation degree of the recovery process is high, full-automatic unmanned control can be realized through the PLC, and the occupied area and the project investment can be reduced compared with other blast furnace top material gas filling recovery processes.
Claims (3)
1. The self-cleaning purification and full recovery process of pressure-equalizing coal gas of a blast furnace top charging bucket is characterized in that: the method comprises the following steps:
step 1: opening a sealing material-intercepting valve on the blast furnace burden tank, and allowing the blast furnace burden to fall into the blast furnace burden tank, wherein the pressure in the blast furnace burden tank is equal to the atmospheric pressure;
step 2: after the charging of the blast furnace charging bucket is finished, closing the upper sealing material intercepting valve, and opening the pressure equalizing valve to pressurize the charging bucket by clean gas;
and step 3: when the pressure in the material tank is equal to the pressure in the blast furnace, pressure equalization is completed, the lower sealing material-intercepting valve of the material tank is opened, and after the furnace burden falls into the blast furnace, the lower sealing material-intercepting valve is closed;
and 4, step 4: starting a recovery system, opening a natural recovery valve, filtering high-pressure coal gas in a material tank through a furnace top cyclone cloth bag composite dust collector, and then entering a low-pressure coal gas pipe network through a coal gas recovery pipeline, the natural recovery valve, a check valve, a manual butterfly valve and a manual blind plate valve;
and 5: after the gas is naturally recovered, when the pressure detection shows that the pressure of the gas recovery pipeline is equal to the pressure of a low-pressure gas pipe network, closing a natural recovery valve, simultaneously opening a forced recovery valve behind a forced recovery ejector and a communication valve in front of the forced recovery ejector, forming high-speed airflow in the forced recovery ejector through the pressure-equalizing gas with higher pressure to generate negative pressure, and forcibly recovering the residual gas in the material tank to the low-pressure gas pipe network through the communication valve to realize 100% recovery of the pressure-equalizing gas;
step 6: when the pressure detection detects that the pressure in the material tank is reduced to be consistent with the atmospheric pressure, the forced recovery valve and the communication valve are closed to complete the recovery of the gas in the material tank for the first time, and a check valve is added on the gas recovery pipeline in order to prevent the gas in the low-pressure pipe network from flowing backwards;
and 7: opening a material tank upper sealing material intercepting valve, enabling the material tank to enter the next charging procedure, closing the material tank upper sealing material intercepting valve after charging is finished, and opening a gas pressure equalizing valve, wherein high-pressure clean gas is used for taking dust deposited on the surface of a filter bag in the cyclone cloth bag composite dust collector into the material tank through a dust discharging valve sent by a dust hopper, so that self-cleaning type dust cleaning of the cyclone cloth bag composite dust collector is realized;
and 8: the recovery process is carried out repeatedly, and the blast furnace charge gas filling recovery is completed each time.
2. The blast furnace top bucket pressure-equalizing gas self-cleaning purification and total recovery process according to claim 1, characterized in that: and the dust concentration detection is arranged on the recovery pipeline and is used for detecting whether the dust concentration of the recovered coal gas entering the low-pressure coal gas pipe network is qualified or not.
3. The blast furnace top bucket pressure-equalizing gas self-cleaning purification and total recovery process according to claim 1, characterized in that: the manual butterfly valve and the manual blind plate valve are opened when the system operates normally, and are closed when other valves and equipment are overhauled, and coal gas is cut off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911145015.6A CN110938723A (en) | 2019-11-21 | 2019-11-21 | Pressure-equalizing gas self-cleaning purification and full-recovery process for blast furnace top charging bucket |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911145015.6A CN110938723A (en) | 2019-11-21 | 2019-11-21 | Pressure-equalizing gas self-cleaning purification and full-recovery process for blast furnace top charging bucket |
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| CN110938723A true CN110938723A (en) | 2020-03-31 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115386668A (en) * | 2022-09-02 | 2022-11-25 | 中冶华天工程技术有限公司 | Novel pressure-equalizing coal gas full-recovery method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN207727100U (en) * | 2017-11-29 | 2018-08-14 | 中冶南方工程技术有限公司 | A kind of full recovery system of blast furnace top pressure-equalizing bleeding coal gas |
| CN110004258A (en) * | 2019-04-02 | 2019-07-12 | 北京首钢国际工程技术有限公司 | A kind of device recycling blast furnace top pressure-equalizing bleeding coal gas |
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- 2019-11-21 CN CN201911145015.6A patent/CN110938723A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN207727100U (en) * | 2017-11-29 | 2018-08-14 | 中冶南方工程技术有限公司 | A kind of full recovery system of blast furnace top pressure-equalizing bleeding coal gas |
| CN110004258A (en) * | 2019-04-02 | 2019-07-12 | 北京首钢国际工程技术有限公司 | A kind of device recycling blast furnace top pressure-equalizing bleeding coal gas |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115386668A (en) * | 2022-09-02 | 2022-11-25 | 中冶华天工程技术有限公司 | Novel pressure-equalizing coal gas full-recovery method |
| CN115386668B (en) * | 2022-09-02 | 2023-12-05 | 中冶华天工程技术有限公司 | Pressure equalizing gas full recovery method |
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