CN111020086A - Method for quickly introducing coal gas during blow-in of blast furnace - Google Patents
Method for quickly introducing coal gas during blow-in of blast furnace Download PDFInfo
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- CN111020086A CN111020086A CN201911390716.6A CN201911390716A CN111020086A CN 111020086 A CN111020086 A CN 111020086A CN 201911390716 A CN201911390716 A CN 201911390716A CN 111020086 A CN111020086 A CN 111020086A
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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
- C21B5/06—Making pig-iron in the blast furnace using top gas in the blast furnace process
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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
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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Abstract
The invention discloses a method for quickly introducing coal gas during blow-in of a blast furnace, which comprises the following steps: 1) drying the blast furnace before the blast furnace is opened; 2) during the baking period of the blast furnace, the baking furnace waste gas at the top of the blast furnace is used for drying the refractory material in the gas passage after the furnace is opened in advance; 3) controlling the water content of the raw materials entering the blast furnace before blowing in the blast furnace, using dry quenching coke to blow in the blast furnace, directly sintering the sintering ore, and selecting raw materials with the water content less than or equal to 2% as auxiliary materials for blowing in the blast furnace; 4) preparing the blow-in time, providing blast air by using a blast furnace fan, and judging whether the cold air drying can be finished and the ignition blow-in time is available or not by detecting the temperature of the blast furnace top waste gas; 5) closing the manhole at the top of the furnace and along the line during the cold air material drying period; 6) when the planned ignition and furnace opening time of the blast furnace is reached, the air is directly supplied to the hot blast stove from a cold air furnace drying state; the invention realizes that the coal gas can be recovered 2 hours after the ignition and the air supply are started, reduces the dispersion of the coal gas to the air for 8 to 14 hours, recovers millions of squares of the coal gas in advance and reduces the pollution of the emission of the coal gas to the atmosphere.
Description
Technical Field
The invention relates to the technical field of blast furnace blow-in, in particular to a method for quickly introducing coal gas during blast furnace blow-in.
Background
The blow-in process of the blast furnace in China is basically that normal temperature furnace burden consisting of coke and ore is filled in advance in the furnace, hot air (650 plus 750 ℃ hot air) is blown into the furnace from a tuyere during blow-in to ignite the coke or firewood and then generate high temperature coal gas, the furnace burden in the blast furnace and the furnace burden on the upper part are gradually heated, the coal gas generated in the process contains 23-35% of CO, the temperature of the coal gas reaching the top of the blast furnace is low at the initial stage of blow-in ignition and air supply, generally about 30 ℃, the coal gas can not be received by a dry dust removal cloth bag, the coal gas in the process needs to be directly diffused in the atmosphere, the duration time needs about 10-16 hours, the coal gas can not be completely recycled through the dust removal cloth bag until the temperature of the coal gas at the top of the blast furnace gradually rises to be higher than 100 ℃, a large amount of blast furnace coal gas needs to be diffused to the air in the process, and about 200-400 ten thousand m3 coal gas is diffused in the process of the blast furnace above 2000m3 level. The coal gas recovery speed is low, the air diffusion time is long, the coal gas is wasted, and the air is polluted.
Patent numbers: 201110408100.4 the method for drying and blowing in the furnace of raw gas pipeline to make the temperature of the gas drop to 100-65 deg.C is mentioned in the "all-dry dedusting blowing in gas-guiding method for drying raw gas pipeline in the furnace of blast furnace". According to the technical scheme, the raw coke oven gas pipeline is baked by using the cold air baking method, the temperature of cold air entering the furnace is controlled by the cold air baking method to be generally within 170 ℃, and the temperature of the gas is lower than 70 ℃ when the gas reaches the top of the blast furnace, so that the water in the refractory material of the raw coke oven gas pipeline cannot be discharged cleanly.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a method for quickly introducing coal gas during the blow-in of a blast furnace.
The technical scheme adopted by the invention for solving the technical problems is as follows: a method for rapidly introducing coal gas during blow-in of a blast furnace comprises the following steps:
1) the blast furnace is dried before the blast furnace is opened, and the indication of the end of the furnace drying is that the water content in the blast furnace top waste gas is the same as the water content in blast air and the water content in the furnace lining in the blast furnace is dried;
2) during the baking period of the blast furnace, the baking furnace waste gas at the top of the blast furnace is used for drying the refractory material in the gas passage after the furnace is opened in advance;
3) controlling the water content of the raw materials entering the blast furnace before blowing in the blast furnace, using dry quenching coke to blow in the blast furnace, directly sintering the sintering ore, and selecting raw materials with the water content less than or equal to 2% as auxiliary materials for blowing in the blast furnace;
4) preparing the blow-in time, providing blast air by using a blast furnace blower, carrying out cold air drying on furnace burden in the blast furnace through a blast furnace cold air regulating valve pipeline, and judging whether the cold air drying can be finished and the ignition blow-in time is available or not by detecting the temperature of blast furnace top waste gas;
5) closing the manhole at the top of the furnace and along the furnace during the cold air material drying period, and heating the clean recovered gas section to above 50 ℃;
6) when the planned ignition and furnace opening time of the blast furnace is reached, the air is directly transferred to the hot blast furnace for air supply from a cold air furnace drying state.
Specifically, the oven drying time in the step 1 is controlled to be 10-15 days.
Specifically, the temperature of the furnace top drying waste gas in the step 2 is controlled to be 100-300 ℃, the furnace top drying waste gas is used for drying the refractory material in the furnace opened gas passage in advance, the refractory material is discharged from a furnace top ascending tank, a five-way ball furnace top descending pipe, a raw pipe between a dust collector and a dry dust collection cloth bag to a three-hole diffusing tower, the refractory material in the furnace opened gas passage can be dried in advance in a high-temperature waste gas section, and the drying time is 5 days.
Specifically, the water content of the dry quenched coke in the step 3 is lower than 1%, and the blowing auxiliary materials are limestone, silica, manganese ore, dolomite or fluorite.
Specifically, the air blowing temperature in the step 4 is controlled at 130-170 ℃, the cold air drying time is controlled at 24-48 hours, and the sign of the end of the cold air drying is that the temperature of the furnace top waste gas is 50-70 ℃ and the ignition blow-in time is provided.
Specifically, the furnace top diffusion and manhole along the line are closed during the cold air material drying in the step 5, and the cold air fed from the air port reaches the furnace top, the ascending pipe, the five-way ball, the descending pipe, the cyclone dust collector, the raw gas pipeline to the three-hole diffusion tower through the furnace burden, and is heated to more than 50 ℃ again in the clean gas recovery section.
Specifically, in the step 6, the air supply of the hot blast stove is directly changed from the cold air drying state to the open furnace top for diffusing, the cold air passes through the hot blast stove to enable the cold air temperature to reach 500-plus-700 ℃, the furnace is started, and after the furnace is started, as long as the temperature of the coal gas at the furnace top reaches more than 45 ℃, the coal gas component detection experiment is performed, the coal gas is recovered through a dry dust removal cloth bag after the detection is qualified, and the time for recovering the coal gas is controlled within 2 hours.
The invention has the following beneficial effects:
the method for rapidly introducing the coal gas during the blow-in of the blast furnace realizes that the moisture in the blast furnace and the raw gas pipeline is dried in advance in the furnace drying process when the blast furnace is dried; controlling the moisture in the furnace charge in the charging process, and using auxiliary materials of dry quenching and low moisture; after the charging is finished, the charging is heated in advance by using a cold air drying method, and partial moisture in the charging is removed in advance along with the cold air; during the cold air drying period, the raw gas pipeline is heated to more than 50 ℃ again, the constraint of the traditional thought is overcome, the worry about the sticking and hardening of the dry cloth bag in the low temperature state is realized, the temperature of the furnace top gas is 50 ℃, and the gas is quickly introduced after the furnace is opened for 2 hours; the coal gas can be recovered 2 hours after the ignition and air supply are started, the air diffusion of the coal gas is reduced by 8-14 hours, million squares of the coal gas are recovered in advance, and the pollution of the coal gas emission to the atmosphere is reduced.
Drawings
FIG. 1 is a block diagram showing the structure of the blow-in of a blast furnace.
1-blast furnace; 2-cyclone dust collector; 3-a dry dedusting box body; 4-a raw gas pipeline; 5-five-way ball; 6-pressure equalizing and diffusing; 7-furnace top diffusing; 8-a delivery pipe; 9-a riser; 10-ocular valve; 11-a butterfly valve; 12-clean gas pipeline; 13-three-hole diffusing tower; 14-gas chamber; 15-gas pipe network; 16-a pressure regulating valve bank; 17-silencer.
Detailed Description
The technical solutions in the embodiments of the present invention will be described in further detail in the following clearly and completely with reference to the accompanying drawings in the embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in figure 1, the method for rapidly introducing coal gas during the blow-in of the blast furnace comprises the following steps:
1) the blast furnace is dried before the blast furnace is opened, and the indication of the end of the furnace drying is that the water content in the blast furnace top waste gas is the same as the water content in blast air and the water content in the furnace lining in the blast furnace is dried;
2) during the baking period of the blast furnace, the baking furnace waste gas at the top of the blast furnace is used for drying the refractory material in the gas passage after the furnace is opened in advance;
3) controlling the water content of the raw materials entering the blast furnace before blowing in the blast furnace, using dry quenching coke to blow in the blast furnace, directly sintering the sintering ore, and selecting raw materials with the water content less than or equal to 2% as auxiliary materials for blowing in the blast furnace;
4) preparing the blow-in time, providing blast air by using a blast furnace blower, carrying out cold air drying on furnace burden in the blast furnace through a blast furnace cold air regulating valve pipeline, and judging whether the cold air drying can be finished and the ignition blow-in time is available or not by detecting the temperature of blast furnace top waste gas;
5) closing the manhole at the top of the furnace and along the furnace during the cold air material drying period, and heating the clean recovered gas section to above 50 ℃;
6) when the planned ignition and furnace opening time of the blast furnace is reached, the air is directly transferred to the hot blast furnace for air supply from a cold air furnace drying state.
The blast furnace 1 is dried before the blast furnace is opened, the drying time is controlled within 10-15 days, the end of the drying is marked by that the water content in the blast furnace top waste gas is basically the same as that in the blast air, and the water content in the inner lining of the blast furnace is basically dried.
During the blast furnace drying period, the waste gas is discharged from a furnace top ascending tank, a five-way ball furnace top descending pipe, a raw pipe between a dust remover and a dry dust removing cloth bag to a three-hole diffusing tower 13 by using the waste gas (the temperature of the waste gas is between 100 and 300 ℃), and the refractory material in a gas passage after the furnace is opened is dried in advance in a high-temperature waste gas section for 5 days.
The water content of the raw materials is strictly controlled in the process of blowing in the furnace and charging, the dry quenching coke is used for blowing in the furnace, the water content in the coke is required to be within 1 percent, the sintering ore is directly supplied for sintering, the blowing in auxiliary materials are selected from the raw materials with good quality and the water content of less than or equal to 2 percent, such as limestone, silica, manganese ore, dolomite, fluorite and the like, and the moisture in the raw materials is reduced.
And after the charging is finished, according to the time for opening the furnace, using blast air provided by a blast furnace fan in advance (the blast air temperature is 130-170 ℃), and carrying out cold air drying on the furnace materials in the blast furnace through a blast furnace cold air regulating valve pipeline, wherein the drying time is controlled to be 24-48 hours, and the mark is that the temperature of the furnace top waste gas has the ignition time for opening the furnace at 50-70 ℃.
Closing the furnace top diffusion and all manholes along the line during the cold air material drying period, leading the cold air fed from the air port to reach the furnace top through furnace burden in the furnace, and heating the clean recovered gas section to more than 50 ℃ again from the ascending pipe, the five-way ball 5, the descending pipe, the cyclone dust collector 2, the raw gas pipeline 4 to the three-hole diffusion tower 13.
The blast furnace is started when the blast furnace is planned to be ignited, the air supply of the hot blast furnace is directly switched from a cold air furnace baking state, and the method specifically operates: opening the furnace top for diffusing, enabling the cold air to pass through a hot blast furnace to enable the temperature of the cold air to reach 500-700 ℃, carrying out firing and opening the furnace, carrying out a gas component detection experiment as long as the temperature of the gas at the furnace top reaches over 45 ℃ after opening the furnace, recovering the gas through a dry dust removal cloth bag after the gas component detection is qualified, and controlling the time for recovering the gas within 2 hours.
The present invention is not limited to the above embodiments, and any structural changes made under the teaching of the present invention shall fall within the scope of the present invention, which is similar or similar to the technical solutions of the present invention.
The techniques, shapes, and configurations not described in detail in the present invention are all known techniques.
Claims (7)
1. A method for rapidly introducing coal gas during blow-in of a blast furnace is characterized by comprising the following steps:
1) the blast furnace is dried before the blast furnace is opened, and the indication of the end of the furnace drying is that the water content in the blast furnace top waste gas is the same as the water content in blast air and the water content in the furnace lining in the blast furnace is dried;
2) during the baking period of the blast furnace, the baking furnace waste gas at the top of the blast furnace is used for drying the refractory material in the gas passage after the furnace is opened in advance;
3) controlling the water content of the raw materials entering the blast furnace before blowing in the blast furnace, using dry quenching coke to blow in the blast furnace, directly sintering the sintering ore, and selecting raw materials with the water content less than or equal to 2% as auxiliary materials for blowing in the blast furnace;
4) preparing the blow-in time, providing blast air by using a blast furnace blower, carrying out cold air drying on furnace burden in the blast furnace through a blast furnace cold air regulating valve pipeline, and judging whether the cold air drying can be finished and the ignition blow-in time is available or not by detecting the temperature of blast furnace top waste gas;
5) closing the manhole at the top of the furnace and along the furnace during the cold air material drying period, and heating the clean recovered gas section to above 50 ℃;
6) when the planned ignition and furnace opening time of the blast furnace is reached, the air is directly transferred to the hot blast furnace for air supply from a cold air furnace drying state.
2. The method for rapidly introducing coal gas in the blast furnace blowing-in process of claim 1, wherein the furnace drying time in the step 1 is controlled to be 10-15 days.
3. The method for rapidly introducing gas during the blow-in of the blast furnace as claimed in claim 1, wherein the temperature of the furnace top baking waste gas in step 2 is controlled at 100-.
4. The method for rapidly introducing coal gas through blow-in of a blast furnace as claimed in claim 1, wherein the moisture content of the dry quenched coke in the step 3 is less than 1%, and the blow-in auxiliary material is limestone, silica, manganese ore, dolomite or fluorite.
5. The method as claimed in claim 1, wherein the blast temperature in step 4 is controlled at 130-170 ℃, the time for drying the material by cold blast is controlled at 24-48 hours, and the indication for ending the drying by cold blast is that the temperature of the exhaust gas at the top of the blast furnace is 50-70 ℃ and the time for opening the blast furnace is provided.
6. The method for rapidly introducing gas during the blast furnace blowing-in according to claim 1, wherein the furnace top bleeding and manhole along the line are closed during the cold blast drying in step 5, and the cold blast fed from the tuyere is heated to 50 ℃ or more through the furnace burden to the furnace top, the ascending pipe, the five-way ball, the descending pipe, the cyclone, the raw gas pipeline to the three-hole bleeding tower.
7. The method for rapidly introducing coal gas by blowing in a blast furnace as claimed in claim 1, wherein the step 6 of directly switching the blast furnace from the cold air drying state to the blast furnace for opening the furnace top to diffuse, the cold air passes through the blast furnace to make the cold air temperature reach 500-700 ℃, the furnace is fired and opened, the coal gas component detection experiment is performed as long as the temperature of the furnace top coal gas reaches above 45 ℃ after the furnace is opened, the coal gas is recovered through a dry dedusting cloth bag after the detection is qualified, and the time for recovering the coal gas is controlled within 2 hours.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN115386663A (en) * | 2022-08-30 | 2022-11-25 | 马鞍山钢铁股份有限公司 | Intelligent ignition method and system for blast furnace top |
| 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 |
| WO2023134369A1 (en) * | 2022-01-12 | 2023-07-20 | 新疆八一钢铁股份有限公司 | Oxygen enrichment blast-furnace blow in method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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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