CN107419049B - Method for diffusing harmful gas in direct reduced iron shaft furnace raw material tower - Google Patents
Method for diffusing harmful gas in direct reduced iron shaft furnace raw material tower Download PDFInfo
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- CN107419049B CN107419049B CN201710645137.6A CN201710645137A CN107419049B CN 107419049 B CN107419049 B CN 107419049B CN 201710645137 A CN201710645137 A CN 201710645137A CN 107419049 B CN107419049 B CN 107419049B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/02—Making spongy iron or liquid steel, by direct processes in shaft furnaces
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Abstract
The invention relates to a method for diffusing harmful gas in a direct reduced iron shaft furnace raw material tower, which comprises the steps of starting a sound alarm device when a CO gas detector detects that the concentration of CO gas in the raw material tower is higher than a warning concentration, and simultaneously sending an alarm signal to a control system; the control system controls the variable-speed axial flow fan to change from low-speed operation to high-speed operation, the electric valve in the harmful gas emission pipeline connected with the raw material tower is changed from a closed state in normal operation to a full-open state, and the electric valve in the harmful gas emission pipeline connected with the material distribution device at the top of the tower is changed from a full-open state in normal operation to a closed state; introducing the harmful gas in the raw material tower to a harmful gas diffusion pipeline for diffusion; on the premise of not influencing the normal work of the coal-based vertical furnace and the raw material tower, the invention can timely diffuse harmful gas which enters the raw material tower through the high-altitude diffusion pipeline, thereby ensuring the personal safety of field operators at the top of the raw material tower and avoiding accidents such as explosion, fire and the like.
Description
Technical Field
The invention relates to the technical field of coal-based direct reduced iron production, in particular to a method for diffusing harmful gas in a raw material tower of a direct reduced iron shaft furnace.
Background
In the process of producing direct reduced iron by a coal-based vertical furnace, after reduction reaction in the furnace, tail gas discharged by a gas collecting system at the top of the vertical furnace contains a large amount of CO. Considering that CO is extremely strong toxic gas, if the toxic gas gathered at the top of the furnace flows into the top raw material tower through the charging chute and escapes from the top feeding hole, personal injury can be caused to field operators at the top of the raw material tower, and even accidents such as explosion, fire and the like can be caused.
Disclosure of Invention
The invention provides a method for diffusing harmful gas in a raw material tower of a direct reduced iron shaft furnace, which can timely diffuse the harmful gas which flows into the raw material tower through a high-altitude harmful gas diffusion pipeline on the premise of not influencing the normal work of a coal-based vertical furnace and the raw material tower, ensure the personal safety of field operators at the top of the raw material tower and avoid accidents such as explosion, fire and the like.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for diffusing harmful gas in a direct reduced iron shaft furnace raw material tower comprises the following steps:
1) When the direct reduced iron shaft furnace is normally produced, a CO gas detector is adopted to detect the concentration of CO gas in the raw material tower, the gas in the raw material tower and in the material distribution device at the top of the raw material tower is diffused through a harmful gas diffusion pipeline, a variable-speed axial flow fan is arranged at a gas outlet at the upper part of the harmful gas diffusion pipeline, and the lower part of the variable-speed axial flow fan is respectively connected with a ventilation hood in the raw material tower and on the material distribution device at the top of the tower;
2) When the monitored concentration of the CO gas is lower than the warning concentration, the CO gas detector does not send out any signal; the variable-speed axial flow fan is in a low-speed running state, the harmful gas diffusion pipeline connected with the raw material tower is kept in a closed state through the corresponding electric valve, and the harmful gas diffusion pipeline connected with the material distribution device at the top of the tower is kept in a full-open state through the corresponding electric valve; the outside air entering the material distribution device at the top of the tower along with the materials is diffused through a corresponding harmful gas diffusion pipeline, namely, the material inlet of the raw material tower is sealed;
3) When the CO gas detector detects that the concentration of the CO gas in the raw material tower is higher than the warning concentration, an alarm signal is sent to the control system, the control system starts the sound alarm device to inform field operators to evacuate as soon as possible, and meanwhile, the alarm signal is sent to the control system; the control system sends a high-speed running instruction to the variable-speed axial flow fan and also sends an instruction to the electric valves in the 2 harmful gas emission pipelines; the variable-speed axial flow fan is switched to a high-speed running state, an electric valve in a harmful gas emission pipeline connected with the raw material tower is switched to a full-open state, and an electric valve in a harmful gas emission pipeline connected with a material distributing device at the top of the tower is switched to a closed state;
4) When the variable-speed axial flow fan is in a high-speed operation state, harmful gas in the raw material tower is led to a harmful gas diffusion pipeline to be diffused, and simultaneously a large amount of external air enters the raw material tower along with the material from a feed inlet of the raw material tower; when the CO gas detector detects that the concentration of the CO gas in the raw material tower is lower than the warning concentration, the CO gas detector stops sending an alarm signal to the control system, and the control system sends a low-speed running instruction to the variable-speed axial flow fan and simultaneously sends an instruction to the electric valves in the 2 harmful gas diffusion pipelines; the variable speed axial flow fan is changed into a low speed running state, an electric valve in a harmful gas emission pipeline connected with the raw material tower is changed into a closed state, and the harmful gas in the tower cannot escape; the electric valve in the harmful gas diffusion pipeline connected with the tower top distributing device is turned into a full open state; at the moment, the outside air in the material distribution device at the top of the tower is diffused again through the harmful gas diffusing pipeline, and the feeding hole of the raw material tower is sealed again.
Compared with the prior art, the invention has the beneficial effects that:
1) On the premise of not influencing the normal work of the coal-based vertical furnace and the raw material tower, the harmful gas which is blown into the raw material tower can be timely diffused through the high-altitude harmful gas diffusing pipeline, the personal safety of field operators at the top of the raw material tower is ensured, and accidents such as explosion, fire and the like are avoided;
2) The automation degree is high;
3) The variable-speed axial flow fan is divided into 2 working states of high-speed operation and low-speed operation according to conditions, and the working energy consumption is effectively reduced.
Drawings
FIG. 1 is a schematic view showing the principle of a method for diffusing a harmful gas in a raw material tower of a direct reduced iron shaft furnace according to the present invention.
Fig. 2 is a control schematic block diagram of the control system of the present invention.
In the figure: 1. variable speed axial flow fan 2, harmful gas diffusion pipeline 3, electric valve 4, raw material tower 5, tower top distributing device 6, ventilation hood 7, CO gas detector 8 and control system
Detailed Description
The following further describes embodiments of the present invention with reference to the accompanying drawings:
as shown in the figures 1 and 2, the method for diffusing the harmful gas in the direct reduced iron shaft furnace material tower comprises the following steps:
1) When the direct reduced iron shaft furnace is normally produced, a CO gas detector 7 is adopted to detect the concentration of CO gas in a raw material tower 4, gas in the raw material tower 4 and in a material distribution device 5 at the top of the raw material tower is diffused through a harmful gas diffusion pipeline 2, a variable-speed axial flow fan 1 is arranged at a gas outlet at the upper part of the harmful gas diffusion pipeline 2, and the lower part of the variable-speed axial flow fan is respectively connected with a ventilation hood 6 in the raw material tower 4 and on the material distribution device 5 at the top of the tower;
2) When the monitored concentration of the CO gas is lower than the warning concentration, the CO gas detector 7 does not send any signal; the variable-speed axial flow fan 1 is in a low-speed running state, the harmful gas diffusion pipeline 2 connected with the raw material tower 4 is kept in a closed state through the corresponding electric valve 3, and the harmful gas diffusion pipeline 2 connected with the tower top distributing device 5 is kept in a fully-opened state through the corresponding electric valve 3; the external air entering the material distribution device 5 along with the material is diffused through the corresponding harmful gas diffusion pipeline 2, namely, the material inlet of the raw material tower 4 is sealed by gas;
3) When the CO gas detector 7 detects that the concentration of the CO gas in the raw material tower 4 is higher than the warning concentration, an alarm signal is sent to the control system 8, the control system 8 starts a sound alarm device to inform field operators to evacuate as soon as possible, and meanwhile, the alarm signal is sent to the control system 8; the control system 8 sends a high-speed operation instruction to the variable-speed axial flow fan 1 and also sends an instruction to the electric valves 3 in the 2 harmful gas emission pipelines 2; the variable speed axial flow fan 1 is switched to a high speed running state, the electric valve 3 in the harmful gas emission pipeline 2 connected with the raw material tower 4 is switched to a full open state, and the electric valve 3 in the harmful gas emission pipeline 2 connected with the material distributing device 5 at the top of the tower is switched to a closed state;
4) When the variable speed axial flow fan 1 is in a high-speed operation state, harmful gas in the raw material tower 4 is led to the harmful gas diffusion pipeline 2 to be diffused, and simultaneously, a large amount of external air enters the raw material tower 4 from a feed inlet of the raw material tower along with materials; when the CO gas detector 7 detects that the concentration of the CO gas in the raw material tower 4 is lower than the warning concentration, the CO gas detector 7 stops sending an alarm signal to the control system 8, the control system 8 sends a low-speed running instruction to the variable-speed axial flow fan 1, and simultaneously sends instructions to the electric valves 3 in the 2 harmful gas emission pipelines 2; the variable speed axial flow fan 1 is changed into a low speed running state, the electric valve 3 in the harmful gas diffusion pipeline 2 connected with the raw material tower 4 is changed into a closed state, and the harmful gas in the tower cannot escape; the electric valve 3 in the harmful gas diffusion pipeline 2 connected with the tower top distributing device 5 is turned into a full open state; at the moment, the outside air in the material distributing device 5 at the top of the tower is diffused again through the harmful gas diffusing pipeline 2, and the feeding hole of the raw material tower 4 is sealed again.
The alert concentration is set according to national relevant safety standards.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered as the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.
Claims (1)
1. A method for diffusing harmful gas in a direct reduced iron shaft furnace raw material tower is characterized by comprising the following steps:
1) When the direct reduced iron shaft furnace is normally produced, a CO gas detector is adopted to detect the concentration of CO gas in the raw material tower, the gas in the raw material tower and in the material distribution device at the top of the raw material tower is diffused through a harmful gas diffusion pipeline, a variable-speed axial flow fan is arranged at a gas outlet at the upper part of the harmful gas diffusion pipeline, and the lower part of the variable-speed axial flow fan is respectively connected with a ventilation hood in the raw material tower and on the material distribution device at the top of the tower;
2) When the monitored concentration of the CO gas is lower than the warning concentration, the CO gas detector does not send out any signal; the variable-speed axial flow fan is in a low-speed running state, the harmful gas diffusion pipeline connected with the raw material tower is kept in a closed state through a corresponding electric valve, and the harmful gas diffusion pipeline connected with the tower top distributing device is kept in a fully-opened state through a corresponding electric valve; the outside air entering the material distribution device at the top of the tower along with the materials is diffused through a corresponding harmful gas diffusion pipeline, namely, the material inlet of the raw material tower is sealed;
3) When the CO gas detector detects that the concentration of the CO gas in the raw material tower is higher than the warning concentration, an alarm signal is sent to the control system, the control system starts the sound alarm device to inform field operators to evacuate as soon as possible, and meanwhile, the alarm signal is sent to the control system; the control system sends a high-speed running instruction to the variable-speed axial flow fan and also sends an instruction to the electric valves in the 2 harmful gas emission pipelines; the variable-speed axial flow fan is switched to a high-speed running state, an electric valve in a harmful gas emission pipeline connected with the raw material tower is switched to a full-open state, and an electric valve in a harmful gas emission pipeline connected with a material distributing device at the top of the tower is switched to a closed state;
4) When the variable-speed axial flow fan is in a high-speed running state, the harmful gas in the raw material tower is led to a harmful gas diffusion pipeline to be diffused, and simultaneously, a large amount of external air enters the raw material tower along with the material from a feed inlet of the raw material tower; when the CO gas detector detects that the concentration of the CO gas in the raw material tower is lower than the warning concentration, the CO gas detector stops sending an alarm signal to the control system, and the control system sends a low-speed running instruction to the variable-speed axial flow fan and simultaneously sends an instruction to the electric valves in the 2 harmful gas diffusion pipelines; the variable speed axial flow fan is changed into a low speed running state, an electric valve in a harmful gas emission pipeline connected with the raw material tower is changed into a closed state, and the harmful gas in the tower cannot escape; the electric valve in the harmful gas diffusion pipeline connected with the tower top distributing device is turned into a full open state; at the moment, the outside air in the material distribution device at the top of the tower is diffused again through the harmful gas diffusion pipeline, and the material inlet of the raw material tower is sealed again.
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| CN201710645137.6A CN107419049B (en) | 2017-08-01 | 2017-08-01 | Method for diffusing harmful gas in direct reduced iron shaft furnace raw material tower |
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| CN107419049B true CN107419049B (en) | 2022-12-13 |
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| CN205368416U (en) * | 2016-01-14 | 2016-07-06 | 北京神雾环境能源科技集团股份有限公司 | Shaft furnace charging apparatus |
| CN205472690U (en) * | 2016-03-18 | 2016-08-17 | 阳城县绿色铸造研发中心 | Special feed bin device that adds of carbon disulfide gasification reaction stove |
| CN106319142A (en) * | 2015-06-26 | 2017-01-11 | 鞍钢股份有限公司 | Control device and method for recovery and bleeding of converter gas |
-
2017
- 2017-08-01 CN CN201710645137.6A patent/CN107419049B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007225196A (en) * | 2006-02-23 | 2007-09-06 | Nippon Steel Engineering Co Ltd | Purging method for intermediate hopper in waste material inserting apparatus of waste melting furnace |
| CN201737956U (en) * | 2010-06-25 | 2011-02-09 | 鞍山亨通高炉设备工程技术有限公司 | Recycling device for gas in blast-furnace charging and uniform-pressure diffusing process |
| CN104073581A (en) * | 2014-06-18 | 2014-10-01 | 鞍钢集团工程技术有限公司 | Process method and device for forcibly recovering diffused gas of blast furnace |
| CN204644305U (en) * | 2015-05-25 | 2015-09-16 | 云南驰宏锌锗股份有限公司 | A kind of protector preventing producer gas generator stokehold feed bin coal gas and dust leakage |
| CN106319142A (en) * | 2015-06-26 | 2017-01-11 | 鞍钢股份有限公司 | Control device and method for recovery and bleeding of converter gas |
| CN205368416U (en) * | 2016-01-14 | 2016-07-06 | 北京神雾环境能源科技集团股份有限公司 | Shaft furnace charging apparatus |
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