CN112195295A - Method for cutting coal gas of blast furnace and coal gas recovery device thereof - Google Patents
Method for cutting coal gas of blast furnace and coal gas recovery device thereof Download PDFInfo
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- CN112195295A CN112195295A CN201911237402.2A CN201911237402A CN112195295A CN 112195295 A CN112195295 A CN 112195295A CN 201911237402 A CN201911237402 A CN 201911237402A CN 112195295 A CN112195295 A CN 112195295A
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- gas
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- recovery device
- blast furnace
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- 239000003034 coal gas Substances 0.000 title claims abstract description 49
- 238000011084 recovery Methods 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000005520 cutting process Methods 0.000 title claims abstract description 30
- 230000001105 regulatory effect Effects 0.000 claims abstract description 16
- 230000000903 blocking effect Effects 0.000 claims abstract description 7
- 239000000428 dust Substances 0.000 claims description 9
- 238000000605 extraction Methods 0.000 claims description 6
- 238000000746 purification Methods 0.000 claims description 2
- 238000004064 recycling Methods 0.000 claims 2
- 238000013016 damping Methods 0.000 abstract description 11
- 239000002699 waste material Substances 0.000 abstract description 4
- 230000007547 defect Effects 0.000 abstract description 2
- 238000003915 air pollution Methods 0.000 abstract 1
- 238000007664 blowing Methods 0.000 abstract 1
- 230000008901 benefit Effects 0.000 description 5
- 239000007921 spray Substances 0.000 description 3
- 238000007599 discharging Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
-
- 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
- C21B7/002—Evacuating and treating of exhaust gases
- C21B7/005—Bleeder valves or slides
Abstract
A method for cutting coal gas of a blast furnace and a coal gas recovery device thereof are invented for solving the technical defect that the prior blast furnace discharges raw gas to the outside of the furnace to the air during the damping down process. The device comprises the existing system equipment and facilities and is characterized in that gas recovery devices are arranged at two ends of the existing clean gas grid-connected valve in parallel, and each gas recovery device comprises a recovered gas pipeline, a stop valve, a check valve and an air extractor. By adopting the following steps: (1) the air supply quantity is reduced, and the pressure of the top gas is reduced; (2) opening the gas recovery device, closing the net valve for purifying gas and recovering the gas; (3) adjusting the pressure regulating valve group until the pressure regulating valve group is fully opened; (4) stopping air supply when the pressure of the top gas is reduced to micro positive pressure; (5) stopping the gas recovery device, closing the gas blocking valve, and opening the blast furnace crude gas blow-off valve; (6) turning the hot blast stove to a damping-down state; thus, the coal gas cutting process is completed. During the period, the blowing down gas of the blast furnace is completely recovered. Thereby thoroughly solving the problems of energy waste, potential safety hazard, air pollution and the like in the existing damping down process.
Description
The technical field is as follows:
the invention belongs to the technical field of blast furnace damping down, and particularly relates to a coal gas cutting method and a coal gas recovery device in a blast furnace damping down process.
Background art:
the coal gas cutting method used in the damping down of the blast furnace at present comprises the following steps: the crude gas is discharged to the outside of the furnace to the air by opening the furnace top bleeding valve, then the gas blocking valve is closed to block the gas passage of the system, and then the air valve is opened to bleed air and stop air supply. This method is used up to now, and has obvious defects which are not solved: one is that a large amount of coal gas discharged from the top of the blast furnace during the damping down process has potential safety hazard and seriously pollutes the environment due to dust, high temperature, toxicity, flammability and explosiveness; secondly, because coal gas is also an energy source, the coal gas is lost in vain during the damping down process, and energy waste is caused. For this reason, chinese patent CN204022855U discloses "a dust-settling device for blast furnace emission", which uses a whole set of equipment to spray liquid above the furnace top through a spray head, and uses the liquid water mist sprayed from the spray head to remove dust from the emitted coal gas. However, although the device can solve the problem of dust removal of the diffused gas, the problems of gas evacuation and safety are still not solved, and the problem of waste of part of energy is also not solved.
The invention content is as follows:
the technical problem to be solved by the invention is as follows: the method can solve the problems of emptying and safety of the raw gas in the damping down process of the blast furnace, and can completely recycle the coal gas diffused at the top of the blast furnace in the damping down process; not only ensures the process of cutting the coal gas to be safe, reliable, sanitary and environment-friendly, but also can recycle the coal gas. The device adopted by the device has the advantages of simple structure, easy manufacture and installation, convenient operation and the like.
The technical scheme of the invention is as follows:
a blast furnace coal gas cutting method utilizes the existing system equipment facilities, comprises an air supply system, a coal gas dust removal system, a net gas combining valve and a coal gas pipe network, and is characterized in that: the method is characterized in that raw gas is not discharged to the outside of the blast furnace to the air in the coal gas cutting process, a gas recovery device is arranged at two ends of a net gas combining valve 14 in parallel, and the method is realized by adopting the following steps:
(1) the air supply amount is reduced through an air supply system, and the pressure of the furnace top raw gas is gradually reduced;
(2) opening a valve of the gas recovery device, closing a net combining valve of the clean gas, and enabling the gas recovery device to be put into operation, so that the clean gas flows to a gas pipe network through the device;
(3) when the air supply quantity is reduced to a set value, the pressure regulating valve bank is regulated to reduce the pressure of the furnace top raw gas until the pressure regulating valve bank is fully opened;
(4) continuing to reduce the air supply amount until the air valve is fully opened, and stopping air supply when the pressure of the furnace top is reduced to micro positive pressure;
(5) firstly, stopping a valve of the gas recovery device, then closing a gas blocking valve, and opening a blast furnace raw gas blow-off valve;
(6) and (5) converting the state of the hot blast stove group into a damping-down state, and cutting the coal gas.
A gas recovery device for blast furnace coal gas cutting for implementing the method comprises a net gas combining valve and a gas pipe network, and is characterized in that: the two ends of the net valve for net gas mixing are connected in parallel with a gas recovery device, and the gas recovery device comprises a gas recovery pipeline, a stop valve, a check valve and an air extraction device.
The air extractor is an ejector which is connected with a flow regulating valve and a high-pressure gas cut-off valve through a high-pressure gas pipeline; or the so-called air extraction device is an air extractor.
Compared with the prior art, the invention has the following advantages:
1. according to the method for cutting the coal gas, the coal gas recovery device is connected in parallel to the net valve of the clean coal gas, and reasonable operation steps are adopted, so that the method for cutting the coal gas which is used all the time is improved, the current situation that the raw gas is required to be discharged to the air in the existing coal gas cutting process is thoroughly changed, the problem that the raw gas is diffused in the blast furnace damping-down process is solved, potential safety hazards are eliminated, and environmental pollution and energy waste are avoided.
2. The gas recovery device provided by the invention can recover all the gas in the blast furnace gas system in the process of cutting the gas into the gas pipe network, so that the technical effect of not discharging the raw gas to the outside of the furnace to the air in the process of cutting the gas is achieved, the problems of environmental pollution and potential safety hazard are solved thoroughly, and the energy in the aspect is recovered and saved.
3. The ejector or the air extractor of the air extractor can adaptively recover the coal gas according to different working conditions in the production process, so the air extractor has strong practicability and wide popularity.
4. The invention utilizes the equipment facilities of the original system, and the newly added gas recovery device has the characteristics of simple structure, easy implementation, convenient operation, convenient maintenance and management and the like, thereby not only completely ensuring the recovery of the gas in the gas cutting process, but also having the advantages of small investment, quick effect, obvious economic benefit and social benefit and the like, and being beneficial to large-area popularization and application.
Description of the drawings:
FIG. 1 is a schematic structural diagram of the working system and the gas recovery device of the present invention.
The specific implementation mode is as follows:
the present invention will be described in detail with reference to the accompanying drawings.
A blast furnace coal gas cutting method, which utilizes the existing system equipment facilities, as shown in fig. 1, the equipment facilities comprise: the system comprises a cold air pipeline 1, an air release valve 2, a hot air furnace group 3, a hot air pipeline 4, a blast furnace 5, a raw gas pipeline 6, a blast furnace raw gas release valve 7, a gas blocking valve 8, a gravity dust collector 9, a semi-clean gas pipeline 10, a bag-type dust collector 11, a clean gas pipeline 12, a pressure regulating valve group 13, a gas grid valve 14 and a gas pipe network 15. The method is characterized in that: the blast furnace does not discharge raw gas to the outside of the furnace in the process of cutting the gas. In order to achieve the purpose, the invention is provided with a gas recovery device in parallel at two ends of the purified gas grid valve 14.
The gas recovery device comprises a gas recovery pipe 16, a stop valve 17, a check valve 18 and an air extraction device. The air-extracting means here can be used in two ways, one being an ejector 19 as shown in fig. 1, and a high-pressure gas pipe 22 connected thereto and a high-pressure gas shut-off valve 21, a flow regulating valve 20; the other way is to adopt a common air extractor; the former is given by the figure. The front end of the gas recovery device consisting of a recovered gas pipe 16, a stop valve 17, a check valve 18 and an injector 19 is connected to a clean gas pipeline between a gas merging net valve 14 and a pressure regulating valve group 13, and the rear end of the gas recovery device is connected to a gas pipe network 15, so that a gas suction passage is formed for gas recovery.
With the coal gas recovery device, the whole coal gas cutting process can be completed through the following steps:
(1) the air supply amount is reduced through the operation of an air supply system, so that the pressure of the furnace top crude gas is gradually reduced;
(2) then, opening a valve 17 of the gas recovery device, and closing a net combining valve 14 of the clean gas to enable the gas recovery device to be operated, wherein the clean gas flows to a gas pipe network 15 under the pumping action of an ejector 19 or an air extractor;
(3) when the air supply amount is reduced to a set value, the pressure regulating valve group 13 is adjusted to further reduce the pressure of the furnace top raw gas until the pressure regulating valve group 13 is fully opened;
(4) continuing to reduce the air supply amount until the air valve 2 is fully opened, and stopping air supply when the pressure of the furnace top is reduced to micro positive pressure;
(5) firstly, stopping the valve 17 of the gas recovery device, then closing the gas blocking valve 8, and opening the blast furnace raw gas blow-off valve 7;
(6) and (5) converting the state of the hot blast stove group 3 into a damping-down state, and finishing the coal gas cutting.
And finishing the coal gas cutting implementation method.
Supplementary explanation:
1. when the blast furnace is supplied with air, the air release valve 2 is in a closed state, namely, the air is not released to the atmosphere, the hot blast furnace group 3 is in an air supply state, the blast furnace raw gas release valve 7 is in a closed state, the gas blocking valve 8 and the gas merging net valve 14 are in an open state, and the gas recovery device cut-off valve 17 is in a closed state.
2. In the process of recovering the coal gas, a coal gas recovery device cut-off valve 17 is opened, and a high-pressure gas cut-off valve 21 of an ejector 19 or an air extractor starting device is opened, so that the coal gas recovery device is put into use; closing the gas merging net valve 14, and allowing the gas to flow to a gas pipe network 15 through the recovery device; the suction of the ejector 19 is regulated by a flow regulating valve 20 on a high-pressure gas pipeline 22; or the suction force of the air extractor is adjusted by the suction force adjusting device of the air extractor. And the check valve 18 arranged on the gas recovery pipe 16 is used for preventing the gas of the gas pipe network 15 from flowing backwards.
3. The invention realizes the blast furnace damping down by a coal gas cutting method, and realizes the coal gas cutting process by a coal gas recovery device without discharging the raw gas to the outside of the furnace to the air.
In a word, the method and the device can safely realize the whole purification and recovery of the coal gas diffused at the top of the blast furnace in the damping-down process of the blast furnace by the prior cloth bag dust removal system.
The invention can be widely used in the technical fields of blast furnace damping down and coal gas dust removal and recovery.
Claims (4)
1. A blast furnace coal gas cutting method utilizes the existing system equipment facilities, comprises an air supply system, a coal gas dust removal system, a net gas combining valve and a coal gas pipe network, and is characterized in that: the method is characterized in that raw gas is not discharged to the outside of the blast furnace to the air in the coal gas cutting process, a coal gas recovery device is arranged at two ends of a net gas combining valve (14) in parallel, and the method is realized by adopting the following steps:
(1) the air supply amount is reduced through an air supply system, and the pressure of the furnace top raw gas is gradually reduced;
(2) opening a valve (17) of the gas recovery device, closing a net combining valve (14) of the clean gas, and enabling the gas recovery device to be operated to enable the clean gas to flow to a gas pipe net (15) through the device;
(3) when the air supply quantity is reduced to a set value, the pressure regulating valve bank (13) is adjusted to reduce the pressure of the furnace top raw gas until the pressure regulating valve bank (13) is fully opened;
(4) continuing to reduce the air supply amount until the air valve (2) is fully opened, and stopping air supply when the pressure of the furnace top is reduced to micro positive pressure;
(5) firstly, stopping a valve (17) of the gas recovery device, then closing a gas blocking valve (8), and opening a blast furnace raw gas blow-off valve (7);
(6) and (5) converting the state of the hot blast stove group (3) into a damping-down state, and finishing the coal gas cutting.
2. A gas recovery device for blast furnace coal gas cutting comprises a net valve (14) and a gas pipe net (15), and is characterized in that: two ends of the net valve (14) for net gas purification are connected in parallel with a gas recovery device, and the gas recovery device comprises a gas recovery pipeline (16), a stop valve (17), a check valve (18) and an air extraction device.
3. The gas recycling device for blast furnace cutting gas as claimed in claim 2, wherein: the air extraction device is an ejector (19), and the ejector (19) is connected with a flow regulating valve (20) and a high-pressure gas cut-off valve (21) through a high-pressure gas pipeline (22).
4. The gas recycling device for blast furnace cutting gas as claimed in claim 2, wherein: the so-called air extraction device is an air extractor.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910633997 | 2019-07-07 | ||
| CN2019106339977 | 2019-07-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112195295A true CN112195295A (en) | 2021-01-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911237402.2A Pending CN112195295A (en) | 2019-07-07 | 2019-11-26 | Method for cutting coal gas of blast furnace and coal gas recovery device thereof |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020034238A (en) * | 2000-10-31 | 2002-05-09 | 이구택 | Pressure control device of Blast Furnace Hot Stove |
| CN102337364A (en) * | 2011-07-20 | 2012-02-01 | 中冶南方工程技术有限公司 | Device for recovering coal gas in equalizing and relieving process of furnace top of blast furnace |
| CN205062095U (en) * | 2015-10-29 | 2016-03-02 | 中冶华天南京工程技术有限公司 | Blast furnace furnace roof material jar diffuses gas purifying, recovery system |
| CN107201417A (en) * | 2017-07-18 | 2017-09-26 | 沈阳红杉科技有限公司 | A kind of full retracting device of blast furnace roof feed pot pressure-equalizing and discharging coal gas and recovery method |
| CN206721237U (en) * | 2017-03-07 | 2017-12-08 | 北京凯德恒源科技发展有限公司 | Blast furnace roof based on gas fan presses the full recovery system of coal gas |
| CN211665118U (en) * | 2019-11-26 | 2020-10-13 | 阜新达诚科技有限公司 | Gas recycling device for blast furnace cutting gas |
-
2019
- 2019-11-26 CN CN201911237402.2A patent/CN112195295A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020034238A (en) * | 2000-10-31 | 2002-05-09 | 이구택 | Pressure control device of Blast Furnace Hot Stove |
| CN102337364A (en) * | 2011-07-20 | 2012-02-01 | 中冶南方工程技术有限公司 | Device for recovering coal gas in equalizing and relieving process of furnace top of blast furnace |
| CN205062095U (en) * | 2015-10-29 | 2016-03-02 | 中冶华天南京工程技术有限公司 | Blast furnace furnace roof material jar diffuses gas purifying, recovery system |
| CN206721237U (en) * | 2017-03-07 | 2017-12-08 | 北京凯德恒源科技发展有限公司 | Blast furnace roof based on gas fan presses the full recovery system of coal gas |
| CN107201417A (en) * | 2017-07-18 | 2017-09-26 | 沈阳红杉科技有限公司 | A kind of full retracting device of blast furnace roof feed pot pressure-equalizing and discharging coal gas and recovery method |
| CN211665118U (en) * | 2019-11-26 | 2020-10-13 | 阜新达诚科技有限公司 | Gas recycling device for blast furnace cutting gas |
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Application publication date: 20210108 |
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