CN112251552B - Coal gas treatment method for eliminating black smoke emitted from top of blast furnace - Google Patents
Coal gas treatment method for eliminating black smoke emitted from top of blast furnace Download PDFInfo
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- CN112251552B CN112251552B CN202011045321.5A CN202011045321A CN112251552B CN 112251552 B CN112251552 B CN 112251552B CN 202011045321 A CN202011045321 A CN 202011045321A CN 112251552 B CN112251552 B CN 112251552B
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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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- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Blast Furnaces (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention discloses a coal gas treatment method for eliminating black smoke emitted from the top of a blast furnace, which solves the problem of black smoke emitted from the top of the blast furnace in damping down and reblowing processes of the blast furnace by changing a coal gas treatment operation program and utilizing the conventional dry dedusting coal gas purification system under the condition of not adding any equipment. Specifically, in the process of blowing down and re-blowing of the blast furnace, under the condition that the pressure in the furnace is still positive, the method does not open the bleeding valve at the top of the furnace, but introduces the coal gas into the bag-type dust removal box body, removes the dust of the coal gas by utilizing the dust removal function of a bag and then discharges the clean coal gas by utilizing the bleeding pipe of the bag-type dust remover, thereby completely eliminating the phenomenon that black smoke is emitted from the top of the furnace in the process of blowing down and re-blowing.
Description
Technical Field
The invention relates to a method for damping down and reblowing a blast furnace, in particular to a coal gas treatment method for eliminating black smoke from the top of the blast furnace in the damping down and reblowing process of the blast furnace.
Background
Blast furnace damping-down and reblowing are methods of operating a blast furnace in which the blast furnace temporarily stops production and then resumes production. The basic operations of stopping and resuming production of the blast furnace are to stop and resume supply of air into the furnace. The furnace top can discharge a large amount of black smoke to cause serious pollution to the environment in the process of blowing down and reblowing the blast furnace according to the conventional operation. The main reasons for black smoke emission are as follows: when the blast furnace is normally produced, the pressure in the furnace is about 420KPa, and the pressure at the top of the furnace is about 220 KPa. When the air quantity is reduced to 500m3/min during blowing down, the pressure is about 50KPa, the top pressure is about 25KPa, the operation steps are that steam is introduced into the furnace top, one is opened for diffusing, and the blowing down is carried out after the coal gas passage is cut off. In the process of opening and scattering the furnace top, because of the positive pressure, the coal gas and a large amount of smoke dust in the furnace are emitted into the atmosphere through scattering, and the environment is seriously polluted. When the secondary air starts, the furnace top is opened, and the furnace top is closed to diffuse only when the top pressure rises to above 5KPa, so that a large amount of yellow smoke and black smoke can be discharged.
In order to solve the problem that black smoke is emitted from the furnace top in the damping down and reblowing processes of the blast furnace, the device is changed at present. For example, the utility model 'a blast furnace top gas purification and discharge device with blowing down and reblowing' application No. 2017201780512 can solve the problem of black smoke from the furnace top, but needs to add a gas purification and discharge device (second dust remover), and if the second dust remover is installed on the ground, it is difficult to guide the gas because the pipeline is too long, and the expected effect cannot be achieved. If the second dust remover is arranged on the top of the furnace, the space is small due to the high position of the top of the furnace, so that a proper position is difficult to find, and accumulated dust of the second dust remover can become another pollution source if the second dust remover is not properly treated.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects of the prior art, the invention provides a coal gas treatment method for eliminating black smoke emitted from the top of a blast furnace, which can solve the problem of black smoke emitted from the top of the blast furnace under the condition of not adding any equipment.
The technical scheme is as follows: the invention relates to a coal gas treatment method for eliminating black smoke emitted from the top of a blast furnace, which comprises the following steps of:
(1) reducing the blast furnace air pressure to below 30Kpa, opening the steam at the top of the furnace, and then performing gas cutting operation;
(2) sequentially closing outlet butterfly valves of the cloth bag box bodies and synchronously opening the bleeding valves of the cloth bag box bodies;
(3) opening a nitrogen valve of a crude gas main pipe for purging after outlet butterfly valves of all cloth bag box bodies are closed, and filling nitrogen and maintaining pressure;
(4) after the coal gas cutting operation is finished, damping down operation is carried out;
(5) after the damping down, closing the blocking valve of the gravity dust collector, opening the bleeding valve at the top of the furnace, closing the bleeding valves of the cloth bag box bodies in sequence, and closing the inlet butterfly valve of the cloth bag box body synchronously.
For the re-wind process, the steps include:
(a) closing outlet butterfly valves of all the cloth bag box bodies, and opening the bleeding valves and the inlet butterfly valves of all the cloth bag box bodies;
(b) opening a blocking valve of the gravity dust collector, and closing a furnace top bleeding valve;
(c) starting re-air, opening butterfly valves at outlet of the cloth bag box body one by one when the pressure of hot air reaches 20-30 kpa, and synchronously closing the bleeding valves of the cloth bag box body until all the cloth bag box bodies are put into use;
(d) gradually recovering blast furnace air quantity after the coal gas introduction is normal; closing furnace top steam and gas system nitrogen.
In the step (c), if the bleeding valve of one cloth bag box body cannot be closed, the inlet butterfly valve and the outlet butterfly valve of the cloth bag box body with the abnormal bleeding valve are closed after the rest cloth bag box bodies are put into use, and then the treatment is carried out on site.
In the step (2), the bag box body with the relief valve opened accounts for more than 2/3 of all the bag box bodies.
And aiming at the re-air process of long-term damping down, the method also comprises the step of introducing nitrogen into all the cloth bag box bodies and the gravity dust collector in advance for purging before the step (a).
Further, the method also comprises the steps of closing an ignition manhole and opening the furnace top steam before the step (a).
Has the advantages that: compared with the prior art, the method solves the problem that black smoke is emitted from the furnace top in the damping down and reblowing processes of the blast furnace by changing the coal gas processing operation program and utilizing the existing dry dedusting coal gas purification system under the condition of not adding any equipment. Specifically, in the process of blowing down and re-blowing of the blast furnace, under the condition that the pressure in the furnace is still positive, the method does not open the bleeding valve at the top of the furnace, but introduces the coal gas into the bag-type dust removal box body, removes the dust of the coal gas by utilizing the dust removal function of a bag and then discharges the clean coal gas by utilizing the bleeding pipe of the bag-type dust remover, thereby completely eliminating the phenomenon that black smoke is emitted from the top of the furnace in the process of blowing down and re-blowing.
Drawings
FIG. 1 is a schematic view of the structure of a blast furnace body and a gas system.
Detailed Description
The present invention will be described in further detail with reference to fig. 1. Only showing a group of cloth bag box body equipment, 1, a blast furnace body, 2, a blast furnace top bleeding valve, 3, a blast furnace gas down pipe, 4, a gravity dust collector blocking valve, 5, a gravity dust collector, 6, a nitrogen valve, 7, a nitrogen purging pipe, 8, a raw gas main pipe, 9, a cloth bag box body, 10, a cloth bag dust removal inlet butterfly valve, 11, a dust removal cloth bag, 12, a cloth bag pore plate, 13, a cloth bag box body bleeding valve, 14, a cloth bag box body bleeding pipe, 15 a cloth bag dust removal outlet butterfly valve, 16, a clean gas main pipe.
In order to avoid black smoke from the furnace top in the process of rest and return air, the method changes the operation procedure of gas treatment. Specifically, for the damping down process, the steps include:
(1) reducing the blast furnace air pressure to below 30Kpa, opening the steam at the top of the furnace, and then performing gas cutting operation;
(2) sequentially closing the outlet butterfly valves 15 of the cloth bag box bodies 9 and synchronously opening the bleeding valves 13 of the cloth bag box bodies 9; in order to ensure the effect, the cloth bag box body 9 of the relief valve 13 is opened to account for more than 2/3 of all the cloth bag box bodies 9, specifically, a certain 1800m of nine cloth bag box bodies 93For example, the blast furnace ensures that the blow-off valves 13 of at least seven cloth bag box bodies 9 are opened;
(3) after outlet butterfly valves 15 of all cloth bag box bodies 9 are closed, opening a crude gas main pipe 8 nitrogen valve 6 for purging, and filling nitrogen and maintaining pressure;
(4) after the coal gas cutting operation is finished, damping down operation is carried out;
(5) after the damping down, the blocking valve 4 of the gravity dust collector is closed, the bleeding valve 2 at the top of the furnace is opened, the bleeding valves 13 of the cloth bag box bodies 9 are closed in sequence, and the inlet butterfly valves 10 of the cloth bag box bodies 9 are closed synchronously.
For the re-wind process, the steps include:
(a) closing outlet butterfly valves 15 of all the cloth bag box bodies 9, and opening the relief valves 13 and inlet butterfly valves 10 of all the cloth bag box bodies 9;
(b) opening a blocking valve 4 of the gravity dust collector, and closing a furnace top bleeding valve 2;
(c) starting re-air, opening butterfly valves 15 at the outlet of the cloth bag box body 9 one by one when the pressure of hot air reaches 20-30 kpa, and synchronously closing a bleeding valve 13 of the cloth bag box body 9 until all the cloth bag box bodies 9 are put into use; if the bleeding valve 13 of the cloth bag box body 9 can not be closed, after the rest cloth bag box bodies 9 are put into use, the inlet butterfly valve and the outlet butterfly valve of the cloth bag box body 9 with abnormal bleeding valve 13 are closed, and then the cloth bag box body is treated by a respirator on site;
(d) gradually recovering blast furnace air quantity after the coal gas introduction is normal; closing furnace top steam and gas system nitrogen.
Further, aiming at the re-air process of long-term damping down, the method also comprises the steps of introducing nitrogen into all the cloth bag box bodies 9 and the gravity dust collector 5 in advance for purging before the step (a), then closing ignition manholes and opening the furnace top steam.
Compared with the conventional coal gas treatment process of damping down and reblowing: when the blast furnace is stopped, the blast furnace pressure is reduced to about 30-50KPa, the furnace top is opened for diffusion, the coal gas cutting operation is carried out, and black smoke is diffused from the furnace top. When the wind is re-blown, the furnace top is opened at the initial stage of re-blowing, when the wind is blown in the furnace, the top pressure is sent to above 5-8KPa, then the furnace top is closed, the black smoke is released from the furnace top. The invention introduces the coal gas into the bag-type dust removal box body, removes the dust of the coal gas by utilizing the dust removal function of the bag, and then discharges the clean coal gas by utilizing the bag-type dust removal device diffusing pipe, thereby completely eliminating the phenomenon that black smoke is emitted from the furnace top in the damping and re-air processes.
Claims (1)
1. A coal gas treatment method for eliminating black smoke emitted from the top of a blast furnace is characterized in that the method comprises the following steps in the damping down process:
(1) reducing the blast furnace air pressure to below 30Kpa, opening the steam at the top of the furnace, and then performing gas cutting operation;
(2) sequentially closing outlet butterfly valves of the cloth bag box bodies and synchronously opening the bleeding valves of the cloth bag box bodies; the bag box body with the relief valve opened accounts for more than 2/3 of all the bag box bodies;
(3) opening a nitrogen valve of a crude gas main pipe for purging after outlet butterfly valves of all cloth bag box bodies are closed, and filling nitrogen and maintaining pressure;
(4) after the coal gas cutting operation is finished, damping down operation is carried out;
(5) closing a blocking valve of the gravity dust collector after damping down, opening a furnace top bleeding valve, closing the bleeding valves of the cloth bag box bodies in sequence, and synchronously closing inlet butterfly valves of the cloth bag box bodies;
for the re-wind process, the steps include:
(a) closing outlet butterfly valves of all the cloth bag box bodies, and opening the bleeding valves and the inlet butterfly valves of all the cloth bag box bodies;
(b) opening a blocking valve of the gravity dust collector, and closing a furnace top bleeding valve;
(c) starting re-air, opening butterfly valves at outlet of the cloth bag box body one by one when the pressure of hot air reaches 20-30 kpa, and synchronously closing the bleeding valves of the cloth bag box body until all the cloth bag box bodies are put into use; if the bleeding valve of the cloth bag box body cannot be closed, after the other cloth bag box bodies are put into use, the inlet butterfly valve and the outlet butterfly valve of the cloth bag box body with the abnormal bleeding valve are closed, and then the treatment is carried out on site;
(d) gradually recovering blast furnace air quantity after the coal gas introduction is normal; closing furnace top steam and gas system nitrogen;
aiming at the re-air process of long-term damping down, the method also comprises the step of introducing nitrogen into all the cloth bag box bodies and the gravity dust collector in advance for purging before the step (a);
further comprising the step of closing the ignition manhole and opening the furnace top steam before the step (a).
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| CN202011045321.5A CN112251552B (en) | 2020-09-28 | 2020-09-28 | Coal gas treatment method for eliminating black smoke emitted from top of blast furnace |
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| CN112251552B true CN112251552B (en) | 2022-04-19 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09165610A (en) * | 1995-12-13 | 1997-06-24 | Nisshin Steel Co Ltd | Bleeder valve of blast furnace and operation control method therefor |
| 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 |
| CN104878141A (en) * | 2015-06-07 | 2015-09-02 | 山西太钢不锈钢股份有限公司 | Blast furnace low pressure exhaust air cut coal gas blowing down method |
| CN110205423A (en) * | 2019-06-27 | 2019-09-06 | 武汉钢铁有限公司 | A kind of method that coal gas damping down is cut in the release of blast furnace low pressure |
| KR102037032B1 (en) * | 2019-06-27 | 2019-10-25 | 용운중공업 주식회사 | gas treatment for the prevention of pollution from top bleeder valves of blast furnace plant |
| CN111363870A (en) * | 2020-02-21 | 2020-07-03 | 江阴兴澄特种钢铁有限公司 | Environment-friendly damping-down method for blast furnace |
-
2020
- 2020-09-28 CN CN202011045321.5A patent/CN112251552B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09165610A (en) * | 1995-12-13 | 1997-06-24 | Nisshin Steel Co Ltd | Bleeder valve of blast furnace and operation control method therefor |
| 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 |
| CN104878141A (en) * | 2015-06-07 | 2015-09-02 | 山西太钢不锈钢股份有限公司 | Blast furnace low pressure exhaust air cut coal gas blowing down method |
| CN110205423A (en) * | 2019-06-27 | 2019-09-06 | 武汉钢铁有限公司 | A kind of method that coal gas damping down is cut in the release of blast furnace low pressure |
| KR102037032B1 (en) * | 2019-06-27 | 2019-10-25 | 용운중공업 주식회사 | gas treatment for the prevention of pollution from top bleeder valves of blast furnace plant |
| CN111363870A (en) * | 2020-02-21 | 2020-07-03 | 江阴兴澄特种钢铁有限公司 | Environment-friendly damping-down method for blast furnace |
Non-Patent Citations (1)
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| 首钢京唐1号高炉处置长时间无计划休风实践;任立军等;《炼铁》;20110412(第02期);26-29 * |
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