CN110317911B - Method for quickly introducing coal gas after blast furnace overhaul and mid-term delivery - Google Patents
Method for quickly introducing coal gas after blast furnace overhaul and mid-term delivery Download PDFInfo
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- CN110317911B CN110317911B CN201910543564.2A CN201910543564A CN110317911B CN 110317911 B CN110317911 B CN 110317911B CN 201910543564 A CN201910543564 A CN 201910543564A CN 110317911 B CN110317911 B CN 110317911B
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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
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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
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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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- C21B2100/02—
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- Organic Chemistry (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention relates to a method for quickly introducing coal gas after the major and middle maintenance of a blast furnace, which belongs to the technical field of blast furnace ironmaking production and comprises the following steps: a gas diffusing device is additionally arranged on the clean gas branch pipe in front of the clean gas butterfly valves of all the box bodies for dry dust removal; leading blast furnace gas from a blast furnace gas pipe network to a clean gas branch pipe of a dry dust removal box body before the blast furnace is put into production; after the blast furnace is ignited and opened, gradually increasing the air quantity, and starting to introduce coal gas when the air quantity and the temperature of the furnace top reach target values; the blast furnace gas passes through the gravity dust collector and the gas dust collection box body in sequence and is diffused through the gas diffusion valve at the top of the dust collection box body. The method for rapidly introducing the coal gas after the blast furnace overhaul and the middle-aged overhaul provided by the invention greatly shortens the time for introducing the blast furnace gas into a coal gas pipe network and improves the production safety.
Description
Technical Field
The invention relates to a method for quickly introducing coal gas after the large and medium maintenance of a blast furnace, belonging to the technical field of blast furnace iron-making production.
Background
After the blast furnace is put into operation for large and medium maintenance, the generated coal gas needs to be safely and smoothly introduced into a company coal gas pipe network in time, so that the coal gas diffusion time is reduced, the rapid recovery of the condition of the blast furnace is facilitated, and the utilization of the coal gas is improved. Because coal gas has the special properties of toxicity, flammability and explosiveness, a great potential safety hazard exists in the process of introducing the coal gas, and meanwhile, when blast furnace gas is introduced into a coal gas pipe network is a key factor of the recovery speed of a blast furnace. At present, a method of introducing gas in a positive direction is mostly adopted, long time is needed, a large amount of gas is released in the process, the environment is polluted while energy is wasted, and meanwhile, the recovery time of the blast furnace is prolonged.
Disclosure of Invention
The invention aims to provide a method for quickly introducing coal gas after the blast furnace is subjected to large and medium maintenance, so that the time for introducing the blast furnace gas into a coal gas pipe network is greatly shortened, and the production safety is improved.
In order to achieve the purpose, the invention adopts the technical scheme that:
the method for quickly introducing the coal gas after the major and middle maintenance of the blast furnace comprises the following steps,
1) a gas diffusing device is additionally arranged on the clean gas branch pipe in front of the clean gas butterfly valves of all the box bodies for dry dust removal;
2) leading blast furnace gas from a blast furnace gas pipe network to a clean gas branch pipe of a dry dust removal box body before the blast furnace is put into production;
3) after the blast furnace is ignited and opened, gradually increasing the air quantity, and starting to introduce coal gas when the air quantity and the temperature of the furnace top reach target values;
4) and the blast furnace gas sequentially passes through the gravity dust collector and the gas dust collection box body and is diffused through a gas diffusion valve at the top of the dust collection box body.
The technical scheme of the invention is further improved as follows: in the step 1), the gas diffusion device comprises a gas diffusion valve and a sampling tube.
The technical scheme of the invention is further improved as follows: in the step 1), carrying out an explosion test on sampling holes of all the box clean gas branch pipe diffusing devices for at least three times until the sampling holes are qualified.
The technical scheme of the invention is further improved as follows: in the step 2), the blast furnace gas is guided to the clean gas branch pipe of the dry dust removal box body 24 hours before the blast furnace is put into operation.
The technical scheme of the invention is further improved as follows: the target values of the air volume and the furnace top temperature in the step 3) are that the air volume reaches more than 50 percent of the normal air volume and the furnace top temperature reaches more than 150 ℃.
The technical scheme of the invention is further improved as follows: in the step 4), opening a gravity dust collector blocking valve at the side of the blast furnace and closing a furnace top bleeding valve at the same time in the process of introducing the coal gas into the blast furnace; and opening all the clean gas butterfly valves of the dust removal box body in the region of the gas dust removal box body.
The technical scheme of the invention is further improved as follows: and 4) diffusing the blast furnace gas through a gas diffusing valve, performing an explosion test on the dust measuring holes of each gas dust removal box body for at least three times, and merging the blast furnace gas into a blast furnace gas main pipe network until each dust measuring hole is qualified.
Due to the adoption of the technical scheme, the invention has the following technical effects:
the invention provides a method for quickly introducing coal gas after the overhaul and the mid-overhaul of a blast furnace, which is a brand new method for introducing coal gas for the overhaul and the mid-overhaul of the blast furnace, saves time, reduces the diffusion time of the blast furnace coal gas and is beneficial to quickly recovering the condition of the blast furnace compared with the traditional 'forward' method for introducing coal gas.
The method for rapidly introducing the coal gas after the blast furnace is subjected to large and medium maintenance greatly shortens the diffusion time of the blast furnace coal gas, recovers the coal gas with high calorific value as much as possible, reduces atmospheric pollution, reduces heat loss and shortens the time for recovering the normal smelting of the blast furnace.
The method for quickly introducing the coal gas after the blast furnace overhaul and middle-aged overhaul is simple and easy to operate; the added gas diffusion device is easy to manufacture, the gas-leading workload is greatly reduced compared with the prior positive gas-leading method, and the labor intensity is greatly reduced.
Drawings
FIG. 1 is a flow chart of the method for rapidly introducing the coal gas after the large and medium-sized overhaul of the blast furnace.
Detailed Description
The present invention will be described in further detail with reference to fig. 1 and the following embodiments.
The invention discloses a flow chart of a method for quickly introducing coal gas after large and medium maintenance of a blast furnace, which is used for blast furnace iron making, as shown in a appended figure 1. The following are specific examples:
the invention discloses a method for quickly introducing coal gas after blast furnace overhaul and mid-overhaul, which specifically comprises the following steps:
1) and a gas diffusing device is additionally arranged on the clean gas branch pipe in front of the clean gas butterfly valves of all the box bodies for dry dust removal.
The gas diffusion device comprises a gas diffusion valve and a sampling tube. Specifically, the gas diffusion device comprises a gas diffusion valve arranged on the clean gas branch pipe and a sampling pipe hermetically connected with the outlet of the gas diffusion valve; the top of sampling tube is provided with the thief hole.
Furthermore, the sampling holes of the purified gas branch pipe diffusing devices of all the boxes are subjected to an explosion test for at least three times until the purified gas branch pipe diffusing devices are qualified.
2) And leading the blast furnace gas from a blast furnace gas pipe network to a clean gas branch pipe of a dry dust removal box body before the blast furnace is put into production.
Specifically, the blast furnace gas is guided to the clean gas branch pipe of the dry dust removal box body 24 hours before the blast furnace is put into production. In the embodiment provided by the invention, the time interval for introducing the blast furnace gas to the clean gas branch pipe of the dry dust removal box body before the blast furnace is put into production can be about 24 hours, and the sampling holes of all the box body clean gas branch pipe diffusing devices can be used for carrying out explosion tests in sequence near time nodes until the sampling holes are qualified.
3) And after the blast furnace is ignited and opened, gradually increasing the air quantity, and starting to introduce gas when the air quantity and the temperature of the furnace top reach target values.
In the embodiment provided by the invention, the target values of the air volume and the furnace top temperature are that the air volume reaches more than 50% of the normal air volume and the furnace top temperature reaches more than 150 ℃.
4) And the blast furnace gas sequentially passes through the gravity dust collector and the gas dust collection box body and is diffused through a gas diffusion valve at the top of the dust collection box body.
In the process of introducing the coal gas into the blast furnace, opening a blocking valve of a gravity dust collector on the side of the blast furnace and closing a bleeding valve at the top of the blast furnace; and opening all the clean gas butterfly valves of the dust removal box body in the region of the gas dust removal box body.
Further, the blast furnace gas is diffused through the gas diffusing valve, an explosion test is carried out on the dust measuring holes of each gas dust removal box body for at least three times, and the blast furnace gas is merged into the blast furnace gas main pipe network until each dust measuring hole is qualified.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (4)
1. The method for quickly introducing the coal gas after the major and medium maintenance of the blast furnace is characterized by comprising the following steps of: comprises the following steps of (a) carrying out,
1) a gas diffusing device is additionally arranged on the clean gas branch pipe in front of the clean gas butterfly valves of all the box bodies for dry dust removal;
2) leading blast furnace gas from a blast furnace gas pipe network to a clean gas branch pipe of a dry dust removal box body before the blast furnace is put into production;
3) after the blast furnace is ignited and opened, gradually increasing the air quantity, and starting to introduce coal gas when the air quantity and the temperature of the furnace top reach target values;
4) the blast furnace gas sequentially passes through the gravity dust collector and the gas dust collection box body, and is diffused through a gas diffusion valve at the top of the dust collection box body;
in the step 1), the gas diffusion device comprises a gas diffusion valve and a sampling tube;
in the step 1), carrying out an explosion test for not less than three times from sampling holes of all box clean gas branch pipe diffusing devices until the sampling holes are qualified
In the step 2), the blast furnace gas is guided to the clean gas branch pipe of the dry dust removal box body 24 hours before the blast furnace is put into operation.
2. The method for quickly introducing the coal gas after the overhaul and the mid-term delivery of the blast furnace as claimed in claim 1, wherein: the target values of the air volume and the furnace top temperature in the step 3) are that the air volume reaches more than 50 percent of the normal air volume and the furnace top temperature reaches more than 150 ℃.
3. The method for quickly introducing the coal gas after the overhaul and the mid-term delivery of the blast furnace as claimed in claim 1, wherein: in the step 4), opening a gravity dust collector blocking valve at the side of the blast furnace and closing a furnace top bleeding valve at the same time in the process of introducing the coal gas into the blast furnace; and opening all the clean gas butterfly valves of the dust removal box body in the region of the gas dust removal box body.
4. The method for quickly introducing the coal gas after the overhaul and the mid-term delivery of the blast furnace as claimed in claim 1, wherein: and 4) diffusing the blast furnace gas through a gas diffusing valve, performing an explosion test on the dust measuring holes of each gas dust removal box body for at least three times, and merging the blast furnace gas into a blast furnace gas main pipe network until each dust measuring hole is qualified.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910543564.2A CN110317911B (en) | 2019-06-21 | 2019-06-21 | Method for quickly introducing coal gas after blast furnace overhaul and mid-term delivery |
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| CN201910543564.2A CN110317911B (en) | 2019-06-21 | 2019-06-21 | Method for quickly introducing coal gas after blast furnace overhaul and mid-term delivery |
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| CN110317911B true CN110317911B (en) | 2021-03-26 |
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| CN111020086A (en) * | 2019-12-30 | 2020-04-17 | 山东钢铁集团日照有限公司 | Method for quickly introducing coal gas during blow-in of blast furnace |
| CN114921599A (en) * | 2022-05-23 | 2022-08-19 | 广东韶钢松山股份有限公司 | Method for introducing coal gas by blowing in blast furnace |
| CN115820955A (en) * | 2022-11-11 | 2023-03-21 | 日照钢铁控股集团有限公司 | Process method for quickly introducing coal gas during blow-in of blast furnace |
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| JP2001276536A (en) * | 2000-03-29 | 2001-10-09 | Hitachi Zosen Corp | Dry dust collecting apparatus for blast furnace |
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| CN103276124A (en) * | 2013-05-29 | 2013-09-04 | 新兴铸管股份有限公司 | Environment-friendly blowing-down/restoring method of blast furnace |
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- 2019-06-21 CN CN201910543564.2A patent/CN110317911B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2001276536A (en) * | 2000-03-29 | 2001-10-09 | Hitachi Zosen Corp | Dry dust collecting apparatus for blast furnace |
| CN101260322A (en) * | 2006-08-29 | 2008-09-10 | 包头钢铁（集团）有限责任公司 | Blast furnace gas dust removing device and technique by dry method |
| 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 |
| CN103276124A (en) * | 2013-05-29 | 2013-09-04 | 新兴铸管股份有限公司 | Environment-friendly blowing-down/restoring method of blast furnace |
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| 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 |
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