CN213416931U - Coal mill utilizing waste gas of hot blast stove - Google Patents
Coal mill utilizing waste gas of hot blast stove Download PDFInfo
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- CN213416931U CN213416931U CN202022182248.8U CN202022182248U CN213416931U CN 213416931 U CN213416931 U CN 213416931U CN 202022182248 U CN202022182248 U CN 202022182248U CN 213416931 U CN213416931 U CN 213416931U
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Abstract
The utility model discloses a coal mill utilizing waste gas of a hot blast stove, which comprises an air conveying inlet and a cooling air inlet, wherein the air conveying inlet is communicated with a waste gas outlet of the hot blast stove through a waste gas pipeline; a gas mixing pipe and an exhaust pipe are arranged on the exhaust gas pipeline, and a third control valve is arranged on the exhaust pipe; a first control valve and a second control valve, a first detector and a second detector are respectively arranged at the rear end of the exhaust pipe and the front end of the gas mixing pipe; the cooling air inlet is communicated with the waste gas pipeline through a cooling air branch pipe, and a fourth control valve is arranged on the cooling air branch pipe; the front end of the air mixing pipe is also communicated with a hot air outlet of the heating furnace through a pipeline, and spiral fins are arranged inside the air mixing pipe. The utility model discloses simple structure, control effect is good, safe and reliable, can detect the oxygen content in the pipeline at any time, both make full use of the waste gas of hot-blast furnace, avoided the safety problem that probably brings again.
Description
Technical Field
The utility model belongs to the technical field of the steelmaking auxiliary assembly, concretely relates to utilize coal pulverizer of hot-blast furnace waste gas utilizes the hot-blast furnace flue gas to use as drying and inert gas.
Background
The bituminous coal has high volatile content and good combustion performance, and the coal injection amount can be increased under the condition of higher replacement ratio by combining with the oxygen enrichment; the bituminous coal can increase the hydrogen content of the gas in the blast furnace, strengthen the reduction process in the furnace and facilitate the smooth operation of the furnace condition. However, the bituminous coal has high volatile components, is easy to spontaneously combust and explosive, brings great potential safety hazard to a coal pulverizing system when a high proportion of bituminous coal is produced, the volatile components of mixed coal reach 25 percent, and the mixed coal is called as strong explosive coal powder, and the explosive destructive power of dust is extremely strong, so that the waste gas of a hot blast stove is used as inert gas for pulverizing coal powder, the oxygen content and the carbon monoxide content of the waste gas of the hot blast stove are extremely high, and if the oxygen content and the carbon monoxide content of the waste gas of the hot blast stove exceed standards, the.
SUMMERY OF THE UTILITY MODEL
The utility model aims at: the coal mill utilizing the waste gas of the hot blast stove utilizes the flue gas of the hot blast stove as drying and inert gas, saves energy and has good safety.
The utility model discloses a realize through following technical scheme: the utility model provides an utilize coal pulverizer of hot-blast furnace waste gas, includes defeated air inlet and cooling air entry, its characterized in that: the air conveying and supplying inlet is communicated with a waste gas outlet of the hot blast stove through a waste gas pipeline; a gas mixing pipe is arranged on one side of the waste gas pipeline close to the coal mill, an exhaust pipe is arranged on one side close to the hot blast stove, and a third control valve is arranged on the exhaust pipe; a first control valve and a second control valve are respectively arranged at the rear end of the exhaust pipe and the front end of the gas mixing pipe, a first detector and a second detector for monitoring the oxygen content in the gas are respectively arranged at the front ends of the first control valve and the second control valve, and the first detector and the second detector are electrically connected with a display; the cooling air inlet is communicated with the waste gas pipeline through a cooling air branch pipe, and a fourth control valve is arranged on the cooling air branch pipe; the front end of the air mixing pipe is also communicated with a hot air outlet of the heating furnace through a pipeline, and spiral fins are arranged inside the air mixing pipe.
The utility model has the advantages that: the scheme has the advantages of simple structure, good control effect, safety and reliability, and can detect the oxygen content in the pipeline at any time, fully utilize the waste gas of the hot blast stove and avoid the safety problem possibly brought.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Detailed Description
Fig. 1 shows a coal mill using waste gas from a hot-blast stove of the present invention, which comprises an air supply inlet with a valve and a cooling air inlet, wherein the air supply inlet is communicated with a waste gas outlet of the hot-blast stove 1 through a waste gas pipeline 4; a gas mixing pipe 7 is arranged on one side of the waste gas pipeline 4 close to the coal mill 2, an exhaust pipe 5 is arranged on one side close to the hot blast stove, and a third control valve 13 is arranged on the exhaust pipe 5; a first control valve 11 and a second control valve 12 are respectively arranged at the rear end of the exhaust pipe and the front end of the gas mixing pipe, a first detector 15 and a second detector 16 for monitoring the oxygen content in the gas are respectively arranged at the front ends of the first control valve 11 and the second control valve 12, and the first detector 15 and the second detector 16 are electrically or signal-connected with the display 9; the cooling air inlet is communicated with the waste gas pipeline 4 through a cooling air branch pipe 6, and a fourth control valve 14 is arranged on the cooling air branch pipe 6; the front end of the gas mixing pipe is also communicated with a hot air outlet of the heating furnace 3 through a pipeline, and a spiral fin 8 is arranged in the gas mixing pipe; a control valve 10 is arranged in the exhaust gas line between the first control valve 11 and the second control valve 12. In the scheme, the hot blast stove, the coal mill, the heating furnace and the like are all structures known in the field, and the scheme is mainly improved in the aspects of pipelines, connection and matching. For convenience of description, the direction of the gas coming from the hot blast stove is taken as the front end according to the walking direction of the gas.
The working process of the utility model is as follows:
in the smelting industry, a coal mill is used for conveying coal powder to a blast furnace, and due to the technological characteristics of a powder making system, the relative parameters of oxygen content, temperature and the like of conveying air need to be strictly controlled in the production process, especially under the condition of high volatile content, the risks of fire and explosion accidents are multiplied, and the high explosive bituminous coal with the volatile content of more than 25 percent is obtained. In the smelting industry, the hot blast stove is one of the common devices, the waste gas of the hot blast stove has the characteristics of high temperature and low oxygen content, and can be used as inert gas for coal dust powder preparation, but the fluctuation of the oxygen content of the waste gas of the hot blast stove is large, the content of oxygen and carbon monoxide exceeds the standard seriously in partial time, and the combustion or explosion of a coal dust system is easily caused. In the scheme, the positions, close to the hot blast stove and the coal mill, of the waste gas pipeline are provided with detectors for detecting the content of combustible gas, the detection result is conveyed to the remote control room in real time, and the detection result can be monitored at any time. If the content is normal, the waste gas and the hot air with higher temperature from the heating furnace are mixed in the gas mixing pipe to reach the proper temperature and oxygen content, and then the mixed gas enters a coal mill for use. The fins in the gas mixing pipe enable the two gases to rotate, and the mixing time and the mixing effect are increased. When the coal mill is stopped and needs cooling, the fourth control valve is opened, the waste gas pipeline is communicated with the cooling air branch pipe 6, meanwhile, the regulating valve 10 can be opened to regulate the amount of the entering air, the temperature and the oxygen content of the cooling air formed by mixing the waste gas and the air meet the requirements, and the combustion of residual materials in the coal mill can be effectively prevented. The lower characteristics of usable hot-blast furnace waste gas oxygen content when the powder process system coal pulverizer shuts down are realized, and the cooperation is promptly filled the nitrogen and is used, can stop to start the superscript problem of system oxygen content during the shut down, prevents to take place the fire incident.
When the oxygen content in the waste gas of the hot blast stove exceeds the standard, the detector detects the oxygen content and transmits the oxygen content to the display, the operator immediately closes the first control valve 11 and the second control valve 12 and opens the third control valve, and the waste gas is discharged into a treatment system and finally discharged to the atmosphere. At the moment, according to the detection data of the first detector, whether the oxygen content in the waste gas reaches the standard or not can be judged, if the oxygen content reaches the standard, the first control valve is opened, whether the position of the second detector reaches the standard or not is observed, if the oxygen content reaches the standard, the second control valve is opened, the operation is carried out according to the mode, if the oxygen content does not reach the standard, residual oxygen in the pipeline is indicated, the regulating valve is opened, and the oxygen is discharged until the oxygen content in the waste gas reaches the standard.
The scheme has the advantages of simple structure, good control effect, safety and reliability, and can detect the oxygen content in the pipeline at any time, fully utilize the waste gas of the hot blast stove and avoid the safety problem possibly brought.
Claims (1)
1. The utility model provides an utilize coal pulverizer of hot-blast furnace waste gas, includes defeated air inlet and cooling air entry, its characterized in that: the air conveying inlet is communicated with a waste gas outlet of the hot blast stove (1) through a waste gas pipeline (4); a gas mixing pipe (7) is arranged on one side of the waste gas pipeline (4) close to the coal mill (2), an exhaust pipe (5) is arranged on one side close to the hot blast stove, and a third control valve (13) is arranged on the exhaust pipe (5); a first control valve (11) and a second control valve (12) are respectively arranged at the rear end of the exhaust pipe and the front end of the gas mixing pipe, a first detector (15) and a second detector (16) for monitoring the oxygen content in the gas are respectively arranged at the front ends of the first control valve (11) and the second control valve (12), and the first detector (15) and the second detector (16) are electrically connected with the display (9);
the cooling air inlet is communicated with the waste gas pipeline (4) through a cooling air branch pipe (6), and a fourth control valve (14) is arranged on the cooling air branch pipe (6);
the front end of the air mixing pipe is also communicated with a hot air outlet of the heating furnace 3 through a pipeline, and a spiral fin (8) is arranged in the air mixing pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022182248.8U CN213416931U (en) | 2020-09-29 | 2020-09-29 | Coal mill utilizing waste gas of hot blast stove |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022182248.8U CN213416931U (en) | 2020-09-29 | 2020-09-29 | Coal mill utilizing waste gas of hot blast stove |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213416931U true CN213416931U (en) | 2021-06-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022182248.8U Active CN213416931U (en) | 2020-09-29 | 2020-09-29 | Coal mill utilizing waste gas of hot blast stove |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213416931U (en) |
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2020
- 2020-09-29 CN CN202022182248.8U patent/CN213416931U/en active Active
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Address after: 115005 metallurgical street, old border district, Yingkou City, Liaoning Province Patentee after: Japan Steel Yingkou Medium Plate Co.,Ltd. Address before: 115005 metallurgical street, old border district, Yingkou City, Liaoning Province Patentee before: MINMETALS YINGKOU MEDIUM PLATE Co.,Ltd. |