CN211821743U - Coal mine drainage gas negative pressure acquisition safety conveying system - Google Patents
Coal mine drainage gas negative pressure acquisition safety conveying system Download PDFInfo
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- CN211821743U CN211821743U CN202020008285.4U CN202020008285U CN211821743U CN 211821743 U CN211821743 U CN 211821743U CN 202020008285 U CN202020008285 U CN 202020008285U CN 211821743 U CN211821743 U CN 211821743U
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Abstract
The utility model discloses a safety conveying system is gathered to colliery drainage gas negative pressure, the system includes: draw and put gas pipeline (6), gas pipeline (9), its characterized in that still includes: the gas drainage utilization shut-off valve (4) of the gas drainage pump station, an explosion-proof device (12), a first explosion suppression device (13) and a water seal fire-retarding explosion-venting device (14); the gas conveying pipeline (9) conveys non-combustible gas under negative pressure; the drainage gas conveying pipeline (6) is arranged on a gas utilization interface reserved in an emptying pipe of a gas pump station; and a gas drainage utilization shut-off valve (4), an explosion-proof device (12), a first explosion suppression device (13) and a water seal fire-retarding explosion-releasing device (14) of a gas drainage pump station are arranged on the gas drainage pipeline (6) along the gas flow direction. The utility model provides a gas mixing point distance from the pump station far away, gas pipeline's safety problem has increased gas pump station's security.
Description
Technical Field
The utility model relates to a colliery energy saving and emission reduction, coal mine safety technique and engineering field, concretely relates to safety conveying system is gathered to colliery drainage gas negative pressure.
Background
In the production process of a coal mine, a large amount of gas stored in a coal seam can flow into a mining space, in order to ensure the safety and health of air in an underground mine of the coal mine, a large amount of fresh air needs to be blown into the underground mine, and the air flow carries methane with extremely low concentration (less than 0.75 percent) and is exhausted from the underground to the atmosphere through an air return port, which is commonly called as 'air exhaust gas' or 'ventilation air'.
Particularly, in some high-gas mines, because the gas concentration of the working face of the high-gas mine far exceeds the standard specified by coal mine safety regulations, the gas concentration of the working face is difficult to control within an allowable range by simply adopting a ventilation method; in coal and gas outburst mines, the outburst danger also seriously threatens the life safety of mine workers and restricts the normal production of the mines. In this case, a gas drainage mode is required to improve the safe production condition of the mine and relieve the production pressure.
In order to reduce and remove the threat of mine gas to coal mine safety production, the method of pumping out or delivering gas existing or released in a coal (rock) layer to the ground or other safe places by using negative pressure caused by mechanical equipment and special pipelines is called gas drainage.
According to statistics, the total amount of methane discharged into the atmosphere by gas drainage in coal mines in China is over 240 billions of cubic meters every year. Methane gas has a strong greenhouse effect, corresponding to 25 times of carbon dioxide. The explosion limit of methane in air is 5% -16%. The coal mine gas is divided into high-concentration gas and low-concentration gas, wherein the high-concentration gas refers to gas with the gas concentration being more than 30%, and the low-concentration gas refers to gas with the gas concentration being less than 30%. More than 60% of gas in China is low-concentration gas containing less than 30% of methane, and according to the requirements of coal mine safety regulations, the gas with the concentration of less than 30% cannot be stored in a gas storage tank, and most of the gas is directly discharged to the air. The direct discharge of the low-concentration gas drained from the coal mine causes huge waste of non-renewable resources on one hand, and also aggravates atmospheric pollution and greenhouse effect on the other hand.
The existing coal mine gas drainage device can collect and convey low-concentration drainage gas, but has the defects that the methane originally discharged into the atmosphere is eliminated by the oxidation treatment of the gas, so that the gas is oxidized into carbon dioxide and water, and the insufficient combustion and the huge greenhouse gas effect are generated. Therefore, how to safely and effectively collect and convey the low-concentration gas drained from the coal mine is very important.
The existing coal mine gas pump station is provided with a gas utilization interface below an emptying pipe, and is generally only provided with a tee joint and a butterfly valve.
In the field of gas oxidation utilization, the drainage gas is usually required to be diluted, the pipe diameter of a gas conveying pipeline for dilution is large, a welding mode is usually adopted, but a coal mine drainage pump station cannot use open fire in a peripheral safety range when the gas pump station operates, and the pump station cannot be in a shutdown state for a long time. Too long a gas conveying pipeline will increase the potential safety hazard.
Disclosure of Invention
An object of the utility model is to overcome above-mentioned technical defect, provide a colliery drainage gas negative pressure gathers safe conveying system.
In order to achieve the above object, the utility model provides a safety conveying system is gathered to colliery drainage gas negative pressure, the system includes: gas pipeline is put in the drainage, gas pipeline, its characterized in that still include: the gas drainage utilization shut-off valve, the explosion-proof device, the first explosion suppression device and the water seal fire-retardant explosion-venting device are used for pumping and discharging gas from the pumping station;
the gas conveying pipeline conveys non-combustible gas under negative pressure;
the gas drainage conveying pipeline is arranged on a gas utilization interface reserved in an emptying pipe of a gas pump station;
and the pumping and discharging gas utilization shut-off valve, the explosion-stopping device, the first explosion suppression device and the water seal fire-retarding explosion-releasing device of the pumping and discharging pump station are arranged on the pumping and discharging gas conveying pipeline along the gas flow direction.
As an improvement of the above device, the system further comprises a gas drainage collecting pipeline;
the drainage gas conveying pipeline is divided into two paths, one path is communicated with the gas inlet of the drainage gas collecting pipeline, and the other path is communicated with the gas inlet of the drainage gas diffusing pipe.
As an improvement of the above device, the system further comprises a non-combustible gas collection port and a mixed gas delivery pipe;
the non-combustible gas collecting port is communicated with a gas inlet of the gas conveying pipeline;
and the gas inlet of the mixed gas conveying pipeline is communicated with the gas outlet of the gas conveying pipeline.
As an improvement of the device, the system also comprises gas utilization equipment and an induced draft fan;
the gas utilization equipment is communicated with a gas outlet of the mixed gas conveying pipeline;
the draught fan is arranged on the mixed gas conveying pipeline and is connected with the gas inlet of the gas utilization equipment, so that the gas pressure in the mixed gas conveying pipeline, the gas conveying pipeline and the gas drainage collecting pipeline in front of the draught fan is negative pressure.
As an improvement to the above apparatus, the system further comprises a baffle and a blender;
and a guide plate and a blender are sequentially arranged at the intersection of the gas conveying pipeline and the drainage gas collecting pipeline along the gas flow direction.
As a modification of the above apparatus, the system further comprises a gas bleeding valve;
the gas blow-off valve is arranged at an air inlet of the gas blow-off pipe and used for adjusting pipeline pressure, the gas blow-off valve is always in an open state when a gas pump station operates, and the gas blow-off valve top emptying pipe is communicated with the atmosphere, so that the gas conveying pipeline is communicated with the atmosphere.
As an improvement of the device, the gas drainage collecting pipeline is also sequentially provided with a gas regulating valve and a second explosion suppression device along the gas flow direction.
As a modification of the above apparatus, the first and second explosion suppression means are activated in response to flame detection signals of the first and second flame sensors;
the first flame sensor is arranged at the position, close to the guide plate, of the gas outlet of the gas drainage collection pipeline;
the second flame sensor is arranged at the position, close to the gas diffusion valve, of the gas outlet of the gas-pumping and-discharging pipe.
Compared with the prior art, the utility model has the advantages that:
1. the utility model uses the gas reserved in the emptying pipe of the gas pump station to connect and draw the gas, thus solving the problem that the pump station needs to be shut down when the gas conveying pipeline is connected with the original pipeline of the pump station; the gas conveying pipeline is provided with an explosion-proof device, an explosion-suppression device, a water-seal fire-retardant explosion-release device and the like, so that the safety problem of the gas conveying pipeline due to the fact that a gas mixing point is far away from a pump station is solved; the utility model discloses utilize the draught fan to form negative pressure initiative collection drainage gas in gaseous collection pipeline, opening of mixing system stops not have any influence to pump station normal operating.
2. Fire-retardant explosion-proof devices with three different principles of fire-retardant explosion venting, explosion suppression and explosion resistance are arranged on a gas drainage pipeline led out from an emptying pipe of a gas pump station, and the arrangement of the fire-retardant explosion venting, explosion suppression and explosion suppression of the first level, the explosion suppression of the second level and the explosion suppression of the third level is carried out according to the sequence, so that the safety of the gas pump station is improved.
3. The non-combustible gas collecting port can be arranged at a coal mine ventilation air methane diffusion tower to collect coal mine ventilation air methane, can also be connected with a hot flue gas pipeline to collect hot flue gas, and can also directly collect atmosphere.
Drawings
Fig. 1 is the utility model relates to a coal mine drainage gas negative pressure gathers safe conveying system structure sketch map.
Reference numerals
1. Coal mine ground extraction pump station 2 and gas drainage pipe
3. Gas drainage emptying valve 4 of extraction pump station and gas drainage utilization shut-off valve of extraction pump station
5. Non-combustible gas collecting port 6 and gas drainage conveying pipeline
7. Gas collecting pipeline 8 and gas utilizing equipment for drainage
9. Gas delivery pipeline 10 and mixed gas delivery pipeline
11. Purging pipeline 12 and explosion-proof device
13. First explosion suppression device 14 and water seal fire-retardant explosion venting device
15. Gas bleeding valve 16, second flame sensor
17. Gas regulating valve 18 and second explosion suppression device
19. First flame sensor 20, wind source regulating valve
21. Pressure sensor 22, guide plate
23. Blending device 24 and measuring instrument
25. Methane concentration monitor 26, defogging dewatering device
27. Purge valve 28, purge fan
29. Isolating valve 30 and draught fan
31. Purge exhaust valve 32, purge exhaust pipe
33. Gas drainage pipe
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Example 1
As shown in fig. 1, a coal mine drainage gas negative pressure acquisition safety conveying system comprises: the system comprises a drainage gas conveying pipeline 6, a drainage gas collecting pipeline 7, an explosion-proof device 12, a first explosion-proof device 13, a second explosion-proof device 18, a water-seal fire-retardant explosion-proof device 14, a gas blow-off valve 15, a non-combustible gas collecting port 5, a gas conveying pipeline 9, a blender 23, a mixed gas conveying pipeline 10, an induced draft fan 30 and gas utilization equipment 8; the exhaust port of the drainage gas collecting pipeline 7 is communicated with the gas conveying pipeline 9, so that the drainage gas is sucked into the gas conveying pipeline 9 from the drainage gas collecting pipeline 7, is uniformly mixed with the non-combustible gas in the gas conveying pipeline 9 through the mixer 23, and is conveyed to the gas utilization equipment 8 through the mixed gas conveying pipeline 10 for utilization.
The drainage gas conveying pipeline 6 is connected with the coal mine drainage gas emptying pipe 2; an explosion-proof device 12, a first explosion suppression device 13, a water-seal fire-retardant explosion-release device 14 and a gas blow-off valve 15 are arranged on the pumping and discharging gas conveying pipeline 6 along the gas flow direction; the emptying pipe at the top of the gas relief valve 15 is communicated with the atmosphere and used for adjusting the pressure of the pipeline, and the gas relief valve is always in an opening state in the operation process and keeps the gas drainage conveying pipeline 6 communicated with the atmosphere.
The drainage gas collecting pipeline 7 is connected with the drainage gas conveying pipeline 6 and the gas conveying pipeline 9 and is provided with a gas regulating valve 17 and a second explosion suppression device 18. The first and second explosion suppression means 13 and 18 are activated in accordance with flame detection signals of the first and second flame sensors 19 and 16. The first flame sensor 19 is arranged at the position, close to the guide plate 22, of the air outlet of the gas drainage collecting pipeline 7; the second flame sensor 16 is arranged at the gas outlet of the gas drainage pipe 33 near the gas drainage valve 15.
When a coal mine gas pump station operates and gas drainage is ready for use, firstly, a gas regulating valve 17 is closed, a gas relief valve 15 is opened, a gas drainage valve 3 of a gas drainage pump station on a gas drainage pipe 2 of a coal mine ground gas drainage pump station 1 is closed, a gas drainage utilization shut-off valve 4 of the gas drainage pump station is opened, and the drained gas is drained to the atmosphere through an explosion-stopping device 12, a first explosion suppression device 13, a water seal fire-retardant explosion-releasing device 14 and the gas relief valve 15 which are arranged on a gas drainage conveying pipeline 6.
When the coal mine gas pump station operates and gas is drained, the opening degree of the gas regulating valve 17 is regulated according to the requirement of the tail-end gas utilization equipment 8, and the drained gas is guided to the gas conveying pipeline 9 to be mixed with the gas by utilizing the negative pressure in the drained gas collecting pipeline 7.
When the gas utilization equipment 8 stops running, the gas regulating valve 17 is closed, the gas drainage evacuation valve 3 of the extraction pump station is opened, the gas conveying pipeline 9 and the gas drainage collection pipeline 7 are at normal pressure, the gas drainage conveying pipeline 6 is provided with a water seal, all gas drained by the gas pump station is drained to the atmosphere through the gas drainage evacuation valve 3, and the gas collection rate is 0%.
Example 2
The utility model discloses use in a colliery ventilation air methane and take out and put gas safety mixing system, as shown in fig. 1, still include:
a pump station acquisition part: a gas drainage pipe 2 and a gas drainage valve 3 of an extraction pump station; the lower port of the drainage gas evacuation pipe 2 is communicated with a coal mine ground drainage pump station 1, and a drainage gas evacuation valve 3 of the drainage pump station is arranged at the tail end of the drainage gas evacuation pipe 2;
blending part: the mixed gas conveying pipeline 10 is provided with a methane concentration monitor 25 and a demisting and dewatering device 26 in sequence along the gas flow direction. And the gas relief valve 15 arranged on the drainage gas conveying pipeline 6 is automatically adjusted in a closed loop mode through continuous online monitoring of the methane concentration. The demisting and dewatering device 26 is internally provided with a plurality of channels for conveying gas flow through corrugated plates which are arranged in parallel, and the channels are used for conveying the gas with water drops removed into the gas utilization equipment 8. The mixed gas conveying pipeline 10 is provided with a measuring instrument 24 at the downstream of the blender 23, and the measuring instrument 24 carries out closed-loop variable frequency control on the induced draft fan 30 through the displayed monitoring value so as to realize the control of the gas flow in the mixed gas conveying pipeline 10. The induced draft fan 30 is connected with the gas inlet of the gas utilization equipment 8, so that the gas pressure in the mixed gas conveying pipeline 10, the gas conveying pipeline 9 and the drainage gas collecting pipeline 7 in front of the induced draft fan 30 is negative pressure. The mixed gas conveying pipeline 10 is provided with an isolation valve 29 at one side close to the inlet of the induced draft fan 30, the isolation valve 29 controls the on-off of the mixed gas conveying pipeline according to the monitoring result of the methane concentration monitor 25, and when the volume concentration of methane monitored by the methane concentration monitor 25 exceeds a preset threshold value, the isolation valve 29 is quickly closed, so that the gas utilization equipment 8 is thoroughly isolated from the mixed gas conveying pipeline 10. The mixed gas conveying pipeline 10 is provided with a purging pipeline 11 at the upstream of an isolation valve 29, the upper port of the purging pipeline 11 is directly communicated with the atmosphere, and the purging pipeline 11 is provided with a purging valve 27 and a purging fan 28; after the gas utilization equipment 8 is stopped, the purging valve 27 is controlled to be opened and the purging fan 28 is controlled to be started through a closed loop, and the gas in the mixed gas conveying pipeline 10 and the gas in the gas conveying pipeline 9 are replaced by utilizing the positive pressure generated by the purging fan 28 and utilizing the outdoor air.
A ventilation air methane part: the air source regulating valve 20, the purging and emptying pipe 32 and the pressure sensor 21 are sequentially arranged on the air conveying pipeline 9 along the air direction, and the purging and emptying valve 31 is arranged at the junction of the air conveying pipeline 9 and the purging and emptying pipe 32.
The mixing processing system can be used for safely collecting, mixing and conveying ventilation air methane and drainage gas in a coal mine, providing a safe air source for subsequent utilization projects such as heat accumulation type high-temperature oxidation and the like, and discharging a thorough oxidation product to the atmospheric environment.
Example 3
The utility model discloses the gaseous mouth of gathering of incombustible of using can set up and gather the colliery ventilation air methane in colliery ventilation air methane diffusion tower department, also can gather hot flue gas with hot flue gas pipe connection, also can directly gather the atmosphere.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and are not limited. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art will understand that modifications and equivalent substitutions can be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and all of them shall fall within the scope of the claims of the present invention.
Claims (8)
1. The utility model provides a safety conveying system is gathered to colliery drainage gas negative pressure, the system includes: draw and put gas pipeline (6), gas pipeline (9), its characterized in that still includes: the gas drainage utilization shut-off valve (4) of the gas drainage pump station, an explosion-proof device (12), a first explosion suppression device (13) and a water seal fire-retarding explosion-venting device (14);
the gas conveying pipeline (9) conveys non-combustible gas under negative pressure;
the drainage gas conveying pipeline (6) is arranged on a gas utilization interface reserved in an emptying pipe of a gas pump station;
and a gas drainage utilization shut-off valve (4), an explosion-proof device (12), a first explosion suppression device (13) and a water seal fire-retarding explosion-releasing device (14) of a gas drainage pump station are arranged on the gas drainage pipeline (6) along the gas flow direction.
2. The coal mine drainage gas negative pressure collection safety conveying system according to claim 1, characterized in that the system further comprises a drainage gas collection pipeline (7);
the drainage gas conveying pipeline (6) is divided into two paths, one path is communicated with the gas inlet of the drainage gas collecting pipeline (7), and the other path is communicated with the gas inlet of the drainage gas diffusing pipe (33).
3. The coal mine drainage gas negative pressure collection safety conveying system according to claim 2, characterized in that the system further comprises a non-combustible gas collection port (5) and a mixed gas conveying pipeline (10);
the non-combustible gas collecting port (5) is communicated with a gas inlet of a gas conveying pipeline (9);
and the gas inlet of the mixed gas conveying pipeline (10) is communicated with the gas outlet of the gas conveying pipeline (9).
4. The coal mine drainage gas negative pressure collection safety conveying system according to claim 3, characterized in that the system further comprises a gas utilization device (8) and an induced draft fan (30);
the gas utilization equipment (8) is communicated with a gas outlet of the mixed gas conveying pipeline (10);
draught fan (30) set up on mist pipeline (10), link to each other with gas utilization equipment (8) air inlet, make mist pipeline (10), gas pipeline (9) before draught fan (30), take out the gas pressure in gas collection pipeline (7) for the negative pressure.
5. The coal mine drainage gas negative pressure collection safety conveying system according to claim 4, characterized in that the system further comprises a deflector (22) and a blender (23);
and a guide plate (22) and a blender (23) are sequentially arranged at the intersection of the gas conveying pipeline (9) and the drainage gas collecting pipeline (7) along the gas flow direction.
6. The coal mine drainage gas negative pressure collection safety conveying system according to claim 5, characterized in that the system further comprises a gas relief valve (15);
gas diffusion valve (15) set up in the air inlet department of drainage gas diffusion pipe (33) for adjust pipeline pressure, be in the open mode all the time when the gas pump station moves, gas diffusion valve (15) top evacuation pipe and atmosphere intercommunication make drainage gas pipeline (6) keep the intercommunication with the atmosphere.
7. The coal mine drainage gas negative pressure collection safety conveying system according to claim 6, wherein the drainage gas collection pipeline (7) is further provided with a gas regulating valve (17) and a second explosion suppression device (18) in sequence along a gas flow direction.
8. The negative pressure collecting and safe conveying system for the coal mine drainage gas as claimed in claim 7, wherein the first explosion suppression device (13) and the second explosion suppression device (18) are started according to flame detection signals of a first flame sensor (19) and a second flame sensor (16);
the first flame sensor (19) is arranged at the position, close to the guide plate (22), of the gas outlet of the gas drainage collecting pipeline (7);
the second flame sensor (16) is arranged at the position of an air outlet of the gas drainage and release pipe (33) close to the gas drainage and release valve (15).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020008285.4U CN211821743U (en) | 2020-01-03 | 2020-01-03 | Coal mine drainage gas negative pressure acquisition safety conveying system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020008285.4U CN211821743U (en) | 2020-01-03 | 2020-01-03 | Coal mine drainage gas negative pressure acquisition safety conveying system |
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| CN211821743U true CN211821743U (en) | 2020-10-30 |
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| CN202020008285.4U Active CN211821743U (en) | 2020-01-03 | 2020-01-03 | Coal mine drainage gas negative pressure acquisition safety conveying system |
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