A coal mine low-concentration gas and air exhaust gas flameless oxidation comprehensive utilization system

Abstract

The present application belongs to the technical field of comprehensive utilization of coal mine gas, especially to a kind of coal mine low concentration gas and wind exhaust gas flameless oxidation comprehensive utilization system, in view of the problem that the existing coal mine gas comprehensive utilization device cannot fully utilize coal mine gas, the following scheme is proposed, including pump gas pipe, the pump gas pipe is connected with water seal fire blocking and explosion relief device, water seal fire blocking and explosion relief device is connected with gas pipe, and gas pipe is connected with first stage mixing device, first stage mixing device is connected with first stage mixed gas pipe;Air conveying pipe one, the air conveying pipe one is connected with first stage mixing fan.The coal mine low concentration gas and wind exhaust gas flameless oxidation comprehensive utilization system disclosed by the present application can significantly reduce greenhouse gas emissions, improve mine safety, and also realize power generation, heat supply or cogeneration comprehensive utilization.

Description

Technical Field

[0001] This invention relates to the field of comprehensive utilization technology of coal mine gas, and in particular to a comprehensive utilization system for low-concentration coal mine gas and exhaust gas using flameless oxidation. Background Technology

[0002] Methane gas is a mixture of methane, carbon dioxide, and nitrogen that escapes from coal and surrounding rocks. It is a harmful factor in coal mine production. When the concentration of methane in the air is 5% to 16%, it can explode when it comes into contact with fire, causing accidents. Methane gas utilization in coal mines is the main way to reduce methane emissions from coal mines.

[0003] Low-concentration methane and ventilation methane in coal mines with a methane volume concentration of less than 8% fall within the scope of the aforementioned methodology. This portion is essentially not utilized and is directly emitted into the atmosphere. Existing coal mine methane comprehensive utilization devices lack effective measures for utilizing low-concentration methane and ventilation methane, resulting in excessive greenhouse gas emissions, affecting mine safety, and reducing energy efficiency. Summary of the Invention

[0004] This invention discloses a flameless oxidation integrated utilization system for low-concentration coal mine gas and ventilation gas, aiming to solve the technical problem in the background art that existing coal mine gas integrated utilization devices cannot fully utilize coal mine gas.

[0005] This invention proposes a flameless oxidation integrated utilization system for low-concentration coal mine gas and ventilation gas, comprising:

[0006] A gas pumping pipe is connected to a water-sealed flame arrestor and explosion venting device. The water-sealed flame arrestor and explosion venting device is connected to a gas supply pipe, and the gas supply pipe is connected to a primary mixer. The primary mixer is connected to a primary mixing gas pipe.

[0007] Air delivery pipe one, the air delivery pipe one is connected to a primary mixing fan, the primary mixing fan is connected to a primary mixer;

[0008] The gas exhaust pipe is connected to a bag filter, the bag filter is connected to a gas exhaust fan, the gas exhaust fan is connected to a primary mixer, the primary gas mixing pipe is connected to a secondary mixer, the secondary mixer is connected to a secondary gas mixing pipe, and the secondary gas mixing pipe is connected to an RTO fan.

[0009] A bed-type regenerative thermal oxidation device is provided, wherein the bed-type regenerative thermal oxidation device is connected to an RTO blower, the bed-type regenerative thermal oxidation device is connected to a high-temperature flue gas pipe, the high-temperature flue gas pipe is connected to a waste heat boiler, the waste heat boiler is equipped with a boiler drum, the boiler drum is connected to a high-pressure superheated steam pipe, and the high-pressure superheated steam pipe is connected to a desuperheating and pressure reducing device and a main steam valve, the desuperheating and pressure reducing device is connected to a steam-water heat exchanger, and the main steam valve is connected to a steam turbine generator.

[0010] The desalination filter tank is connected to a high-pressure pump, which is connected to a reverse osmosis membrane module and a pure water delivery pipe. The pure water delivery pipe is connected to a deaerator, which is connected to an economizer body. The economizer body is equipped with a maintenance device and is connected to a boiler drum. The economizer body is connected to a flue pipe, which is connected to a chimney.

[0011] The gas pumping pipe is equipped with an automatic explosion-proof device, an automatic powder fire extinguishing device, a water-sealed fire-resistant and explosion-proof device, a concentration detector, a safety relief valve, and a gas valve. An air regulating valve is installed on the air supply pipe. A concentration detector, a temperature detector, a safety relief valve, and a valve after secondary blending are installed on the primary blending gas pipe. A control valve is installed on the exhaust gas pipe. An air valve is installed on the air supply pipe. A concentration detector, a regenerative thermal oxidizer valve, a safety relief valve, a secondary blending valve, and a fire damper are installed before the RTO on the secondary blending gas pipe. A hot water circulating pump is installed on the steam-water heat exchanger. The turbine generator is connected to a gearbox and a generator. The turbine generator is connected to a condenser. The condenser is connected to a cooling tower and a water pump. A main steam valve is installed on the high-pressure superheated steam pipe.

[0012] The condenser is connected to a second water pump, which is connected to a third water pump. The third water pump is connected to a condensate pipe, which is connected to a pure water delivery pipe.

[0013] In a preferred embodiment, the maintenance device includes two diversion pipes, both of which are mounted on valve two of the regenerative oxidation device. Each diversion pipe has a diversion box, and two symmetrical control valves are mounted outside each diversion pipe. Two symmetrical support frames are fixedly connected to the bottom of each diversion box. A heat-conducting tube bundle is installed inside each diversion box, and two connecting joints are fixedly connected to each heat-conducting tube bundle. A non-stop maintenance module is mounted outside each diversion box. Both non-stop maintenance modules include a closing plate. A fixing plate is fixedly connected to the side of the closing plate closest to the diversion box. Two symmetrical constraint plates are fixedly connected to the outside of each fixing plate. The opposite sides of the two constraint plates are fixedly connected to the outside of the heat-conducting tube bundle on the same side, and a sealing ring is provided on the outside of each fixing plate. The sealing rings are fixedly connected to the side opposite to the closing plates. The flow divider box has slits, and the inner walls of the slits are slidably connected to the outside of the constraint plate. The sealing rings are in contact with the side opposite to the flow divider box. A base is fixedly connected to the outside of each of the two closing plates. Bolts are installed on the bases, and fixing seats are installed on the outside of the bolts. The fixing seats are fixedly connected to the side opposite to the flow divider box. A rotating handle is fixedly connected to the end of each bolt away from the flow divider box. A slide rail is fixedly connected to the bottom of each flow divider box. A sliding plate is slidably connected inside the slide rail. A connecting plate is fixedly connected to the outside of each sliding plate. The connecting plate is fixedly connected to the side opposite to the closing plate. A groove is opened on the upper side of each sliding plate. A spring is fixedly connected to the inner wall of each groove. The end of the spring away from the groove is connected to the flow divider on the same side. The bottom of the flow box is fixedly connected; two symmetrical slots are opened on the outside of both slide rails, and a follower plate is slidably connected in each slot. The side of the follower plate opposite to the slide plate is fixedly connected. An airbag is fixedly connected to the outside of each follower plate. A conveying pipe is fixedly connected to the outside of each airbag. A positioning plate is fixedly connected to the outside of each conveying pipe. The side of the positioning plate opposite to the slide rail is fixedly connected. A mounting plate is provided on the outside of each conveying pipe. The outside of the mounting plate is fixedly connected to the bottom of the flow box. A throat joint is provided on the outside of each conveying pipe. A knob is provided on the outside of each throat joint. The side of the throat joint opposite to the mounting plate on the same side is fixedly connected. An airbag is fixedly connected to the end of each of the two conveying pipes away from the airbag. One end of the airbag is fixedly connected to the outside of the mounting plate. The diverter box has two symmetrical rectangular slots at its bottom. The outer side of each stable seat is slidably connected to the inner wall of the rectangular slot on the same side. An extension plate is fixedly connected to the outer side of each diverter box. A narrow opening is provided on each of the two extension plates, and a limit plate is slidably connected inside each narrow opening. A slot is provided on each connecting plate, and the inner wall of each slot is engaged with the outer side of the limit plate. A fixing frame is fixedly connected to the bottom of each diverter box. Two symmetrical springs are fixedly connected to the bottom of each of the two limit plates. The bottom end of each spring is fixedly connected to the outer side of the fixing frame. A step plate is fixedly connected to the outer side of each limit plate. A pedal is movably connected to each fixing frame. A torsion spring is provided between the pedal and the fixing frame. The outer side of the pedal is in contact with the outer side of the step plate.

[0014] As can be seen from the above, the integrated utilization system for low-concentration coal mine gas and exhaust gas flameless oxidation provided by the present invention can significantly reduce greenhouse gas emissions and improve mine safety by developing flameless heat storage oxidation utilization of low-concentration coal mine gas and exhaust gas, and can also realize integrated utilization for power generation, heating or cogeneration. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the low-concentration gas mixing and flameless oxidation system proposed in this invention;

[0016] Figure 2 This is a schematic diagram of the waste heat boiler and power generation and heating system proposed in this invention;

[0017] Figure 3 This is a schematic diagram of the diversion box structure of a flameless oxidation integrated utilization system for low-concentration coal mine gas and ventilation gas proposed in this invention.

[0018] Figure 4 This is a schematic diagram of the heat-conducting tube bundle structure of a flameless oxidation integrated utilization system for low-concentration coal mine gas and exhaust gas proposed in this invention.

[0019] Figure 5 This is a schematic diagram of the non-stop maintenance module structure of a comprehensive utilization system for low-concentration coal mine gas and exhaust gas flameless oxidation proposed in this invention.

[0020] Figure 6 This is a schematic diagram of the fixed plate structure of a flameless oxidation and comprehensive utilization system for low-concentration coal mine gas and ventilation gas proposed in this invention.

[0021] Figure 7 This is a schematic diagram of structure A of a comprehensive utilization system for low-concentration coal mine gas and exhaust gas flameless oxidation proposed in this invention.

[0022] Figure 8 This is a schematic diagram of the slide rail structure of a flameless oxidation comprehensive utilization system for low-concentration coal mine gas and ventilation gas proposed in this invention.

[0023] Figure 9 This is a schematic diagram of the fixed frame structure of a comprehensive utilization system for low-concentration coal mine gas and exhaust gas flameless oxidation proposed in this invention.

[0024] In the diagram: 1. Gas pump pipe; 2. Automatic explosion-proof device; 3. Automatic powder spraying fire extinguishing device; 4. Water seal fire-resistant and explosion-proof device; 5. Concentration detector 1; 6. Safety relief valve 1; 7. Gas valve 1; 8. Gas supply pipe; 9. Air supply pipe 1; 10. Primary mixing fan; 11. Air regulating valve; 12. Gas exhaust pipe; 13. Bag filter; 14. Gas exhaust fan; 15. Control valve; 16. Primary mixer; 17. Primary mixing gas pipe; 18. Concentration detector 2; 19. Temperature detector; 20. Safety relief valve 2; 21. Secondary mixing valve; 22. Air valve; 23. 24. Air delivery pipe II; 25. Secondary mixer; 26. Secondary mixing gas pipe; 27. Concentration detector III; 28. Regenerative thermal oxidation device valve II; 29. ​​Safety relief valve III; 30. Secondary mixing valve; 31. RTO fan; 32. Fire damper installed before RTO; 33. Bed-type regenerative thermal oxidation device; 34. High-temperature flue gas pipe; 35. Waste heat boiler; 36. Boiler drum; 37. High-pressure superheated steam pipe; 38. Main steam valve; 39. Desuperheater and pressure reducer; 40. Steam-water heat exchanger; 41. Hot water circulating pump; 42. Main steam valve; 43. Steam turbine generator; 44. Gearbox; 45. Generator; 46. Condensate... 46. ​​Steam turbine; 47. Cooling tower; 48. Water pump 1; 49. Water pump 2; 40. Water pump 3; 51. Condensate pipe; 52. Deaerator; 53. Economizer body; 54. Exhaust pipe; 55. Desalination filter tank; 56. High-pressure pump; 57. Reverse osmosis membrane module; 68. Pure water delivery pipe; 69. Chimney; 60. Diverter pipe; 61. Control valve; 62. Support frame; 63. Heat transfer tube bundle; 64. Connecting joint; 65. Non-stop maintenance module; 6601. Closure plate; 6602. Constraint plate; 6603. Connecting plate; 6604. Slide rail; 6605. Fixing plate; 6606. Sealing ring; 6607. Base 6608. Bolt; 6609. Fixing base; 6610. Rotating handle; 6611. Sliding plate; 6612. Groove; 6613. Spring 1; 6614. Cut groove; 6615. Follower plate; 6616. Airbag 1; 6617. Delivery pipe; 6618. Positioning plate; 6619. Mounting plate; 6620. Throat coupling; 6621. Knob; 6622. Airbag 2; 6623. Rectangular groove; 6624. Stabilizing base; 6625. Extension plate; 6626. Limiting plate; 6627. Fixing bracket; 6628. Spring 2; 6629. Pedal; 6630. Torsion spring; 67. Diverter box. Detailed Implementation

[0025] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0026] The invention discloses a flameless oxidation integrated utilization system for low-concentration coal mine gas and ventilation gas, which is mainly applied to scenarios where existing coal mine gas integrated utilization devices cannot fully utilize coal mine gas.

[0027] Reference Figure 1 and Figure 2 A comprehensive utilization system for low-concentration coal mine gas and ventilation gas through flameless oxidation, comprising:

[0028] The gas pumping pipe 1 is connected to a water seal flame arrestor and explosion relief device 4. The water seal flame arrestor and explosion relief device 4 is connected to a gas transmission pipe 8, and the gas transmission pipe 8 is connected to a primary mixer 16. The primary mixer 16 is connected to a primary mixing gas pipe 17.

[0029] Air delivery pipe 9 is connected to a primary mixing fan 10, and the primary mixing fan 10 is connected to a primary mixer 16.

[0030] Gas exhaust pipe 12 is connected to a bag filter 13, which is connected to a gas exhaust fan 14. The gas exhaust fan 14 is connected to a primary mixer 16, and a primary mixing gas pipe 17 is connected to a secondary mixer 24. The secondary mixer 24 is connected to a secondary mixing gas pipe 25, which is connected to an RTO fan 30.

[0031] A bed-type regenerative thermal oxidizer 32 is connected to an RTO blower 30. The bed-type regenerative thermal oxidizer 32 is connected to a high-temperature flue gas pipe 33, which is connected to a waste heat boiler 34. A boiler drum 35 is installed on the waste heat boiler 34. The boiler drum 35 is connected to a high-pressure superheated steam pipe 36, which is connected to a desuperheating and pressure reducing device 38 and a main steam valve 41. The desuperheating and pressure reducing device 38 is connected to a steam-water heat exchanger 39, and the main steam valve 41 is connected to a steam turbine generator 42.

[0032] A desalination filter tank 54 is connected to a high-pressure pump 55. The high-pressure pump 55 is connected to a reverse osmosis membrane module 56 and a pure water delivery pipe 57. The pure water delivery pipe 57 is connected to a deaerator 51. The deaerator 51 is connected to an economizer body 52. ​​The economizer body 52 is equipped with a maintenance device and is connected to a boiler drum 35. The economizer body 52 is connected to a flue pipe 53, and the flue pipe 53 is connected to a chimney 60.

[0033] The gas pumping pipe 1 is equipped with an automatic explosion-proof device 2, an automatic powder spraying fire extinguishing device 3, a water-sealed fire-resistant and explosion-proof device 4, a concentration detector 5, a safety relief valve 6, and a gas valve 7. The air supply pipe 9 is equipped with an air regulating valve 11. The primary blending gas pipe 17 is equipped with a concentration detector 18, a temperature detector 19, a safety relief valve 20, and a secondary blending valve 21. The ventilation gas pipe 12 is equipped with a control valve 15. The air supply pipe 23 is equipped with an air valve 2. 2. The secondary blending gas pipe 25 is equipped with a concentration detector 3 26, a regenerative thermal oxidation device valve 27, a safety relief valve 3 28, a secondary blending valve 29, and a fire damper 31 before the RTO. The steam-water heat exchanger 39 is equipped with a hot water circulation pump 40. The steam turbine generator 42 is connected to a gearbox 43 and a generator 44. The steam turbine generator 42 is connected to a condenser 45. The condenser 45 is connected to a cooling tower 46 and a water pump 1 47. The high-pressure superheated steam pipe 36 is equipped with a main steam valve 37.

[0034] Condenser 45 is connected to water pump 2 48, water pump 2 48 is connected to water pump 3 49, and water pump 3 49 is connected to condensate pipe 50, which is connected to pure water delivery pipe 57.

[0035] The device can significantly reduce greenhouse gas emissions and improve mine safety by developing low-concentration gas and flameless regenerative thermal oxidation utilization of exhaust gas. It can also achieve integrated utilization of power generation, heating or cogeneration.

[0036] Reference Figures 3-9In a preferred embodiment, the maintenance device includes two diversion pipes 61, both of which are mounted on valve 27 of the regenerative oxidation device. Each diversion pipe 61 is equipped with a diversion box 67. Two symmetrical control valves 62 are mounted on the outside of each diversion pipe 61. Two symmetrical support frames 63 are bolted to the bottom of each diversion box 67. A heat-conducting tube bundle 64 is installed inside each diversion box 67, and two connecting joints 65 are bolted to each heat-conducting tube bundle 64. A non-stop maintenance module is installed outside each diversion box 67. Block 66; Both non-stop maintenance modules 66 include a closing plate 6601. A fixing plate 6605 is bolted to the side of the closing plate 6601 near the distribution box 67. Two symmetrical constraint plates 6602 are bolted to the outside of each fixing plate 6605. The opposite side of each constraint plate 6602 is bolted to the outside of the heat-conducting tube bundle 64 on the same side. A sealing ring 6606 is provided on the outside of each fixing plate 6605. The sealing ring 6606 is bolted to the side of the closing plate 6601 opposite to it. The distribution box 6... The 7th plate has a slit, the inner wall of which is slidably connected to the outside of the constraint plate 6602. The sealing ring 6606 is in contact with the opposite side of the flow divider 67. The outside of the two closing plates 6601 are each bolted to a base 6607. Each base 6607 is provided with a bolt 6608. The outside of each bolt 6608 is provided with a fixing seat 6609. The side of the fixing seat 6609 opposite to the flow divider 67 is bolted to it. The end of each bolt 6608 away from the flow divider 67 is bolted to a rotating handle 6610. The flow divider... The bottom of 67 is bolted to a slide rail 6604. A sliding plate 6611 is slidably connected inside the slide rail 6604. A connecting plate 6603 is bolted to the outside of the sliding plate 6611. The side of the connecting plate 6603 opposite to the closing plate 6601 is bolted to the connecting plate 6603. A groove 6612 is provided on the upper side of the sliding plate 6611. A spring 6613 is bolted to the inner wall of the groove 6612. The end of the spring 6613 away from the groove 6612 is bolted to the bottom of the diversion box 67 on the same side.Two symmetrical slots 6614 are formed on the outer side of each of the two slide rails 6604. A follower plate 6615 is slidably connected within each slot 6614. The side of the follower plate 6615 opposite to the slide plate 6611 is bolted to both sides. An airbag 6616 is bolted to the outside of each follower plate 6615. A conveying pipe 6617 is bolted to the outside of each airbag 6616. A positioning plate 6618 is bolted to the outside of each conveying pipe 6617. The side of the positioning plate 6618 opposite to the slide rail 6604 is bolted to both sides. Each delivery pipe 6617 is equipped with a mounting plate 6619, which is bolted to the bottom of the distribution box 67. Each delivery pipe 6617 is also equipped with a hose reel connector 6620, and each hose reel connector 6620 has a knob 6621. The hose reel connector 6620 is bolted to the side opposite to the mounting plate 6619 on the same side. Each of the two delivery pipes 6617, at the end furthest from airbag one 6616, is bolted to airbag two 6622, and one end of airbag two 6622 is bolted to the mounting plate. The external end of 6619 is bolted together, and the other end is bolted together with a stabilizing seat 6624. The bottom of the diversion box 67 has two symmetrical rectangular slots 6623. The external end of each stabilizing seat 6624 is slidably connected to the inner wall of the rectangular slot 6623 on the same side. The external end of the diversion box 67 is bolted together with an extension plate 6625. Both extension plates 6625 have narrow openings, and each narrow opening has a slidably connected limit plate 6626. The connecting plate 6603 has a slot, and the inner wall of each slot engages with the external end of the limit plate 6626. Furthermore, the bottom of each diversion box 67 is bolted to a fixing frame 6627; the bottom of each of the two limiting plates 6626 is bolted to two symmetrical springs 6628, the bottom ends of which are bolted to the outside of the fixing frame 6627. Each limiting plate 6626 is bolted to a mounting plate, and each fixing frame 6627 is rotatably connected to a pedal 6629 via a bearing. A torsion spring 6630 is installed between the pedal 6629 and the fixing frame 6627, and the outside of the pedal 6629 contacts the outside of the mounting plate.

[0037] In specific application scenarios, the non-stop maintenance module 66 is mainly suitable for non-stop maintenance procedures. Specifically, the non-stop maintenance module 66, using the diverter pipe 61 and control valve 62, allows the device to perform maintenance operations on the heat-conducting tube bundle 64 without shutting down the entire system. By setting up a redundant system, the normal operation of the device is ensured. Furthermore, using the slide rail 6604 and sliding plate 6611, personnel can avoid working in the high-temperature environment inside the diverter box 67 during the maintenance of the heat-conducting tube bundle 64. To protect personnel safety, the cross-sectional area of ​​the delivery pipe 6617 is changed by applying pressure to the throat joint 6620, thereby controlling the gas flow speed in the delivery pipe 6617. This ensures that the sliding plate 6611 is always subject to a fixed resistance when sliding in the slide rail 6604. As a result, when the sliding plate 6611 moves the heat conduction tube bundle 64 from the distribution box 67 under the elastic force of the spring 6613, it can maintain a uniform speed, ensuring the stability of the heat conduction tube bundle 64 and preventing the heat conduction tube bundle 64 from moving too fast and hitting maintenance personnel.

[0038] Working principle: The gas extracted from the pump station passes through the gas extraction pipe 1, the automatic explosion-proof device 2, the automatic powder spraying fire extinguishing device 3, and the water-sealed fire-resistant and explosion-proof device 4. The gas from the gas pipeline 8 is mixed with air from the primary mixing fan 10, or with exhaust gas from the exhaust gas pipeline 12. After the dust is removed by the bag filter 13, the gas is transported to the primary mixer 16 by the exhaust gas fan 14. The gas, air, and exhaust gas are uniformly mixed in the primary mixer 16, and the methane concentration of the gas after mixing is <2.8%. When the methane concentration is 1.0% ≤ methane concentration <1.2%, the air valve 22, the secondary mixing valve 21, and the second safety relief valve 20 are adjusted. When the methane concentration is ≥1.2%, the regenerative oxidation device valve 27 is interlocked and closed, the gas pipeline 8 and the secondary mixing valve 21 are closed, and the third safety relief valve 28, the first safety relief valve 6, and the second safety relief valve 20 are opened. The methane volume concentration in the secondary blended gas in the secondary blending gas pipe 25 is <1.2%. It is transported to the bed-type regenerative thermal oxidizer 32 by the RTO blower 30 for flameless oxidation. A fire damper 31 is installed before the RTO to prevent backfire and fire accidents. After mixing, the low-concentration gas instantly undergoes flameless combustion in the high-temperature oxidation bed of the RTO (above 950℃), releasing oxygen heat within the oxidation bed. Since the generated oxidation heat far exceeds the heat requirement for the oxidation environment of the oxidation unit itself, the excess heat is utilized as heat. The heat from this unit is discharged through the top of the RTO, and the discharged 950℃ high-temperature flue gas enters the waste heat boiler 34 to generate high-temperature and high-pressure superheated steam. The raw water passes through the desalination filter tank 54, then is transported by the high-pressure pump 55, and finally filtered by the reverse osmosis membrane group 56 to produce pure water, which flows into the deaerator 51 from the pure water delivery pipe 57. The superheated steam passes through the main steam valve 37, the desuperheater 38, and is condensed by the steam-water heat exchanger 39. After being combined with the pure water by the condensate pump 49, it reaches the deaerator 51, then exchanges heat with the flue gas through the economizer, and finally reaches the boiler drum 35. The cold side of the steam-water heat exchanger 39 heats industrial water, which is then sent to the heating area or used for bathing via the hot water circulation pump 40. When one of the heat-conducting tube bundles 64 needs maintenance, turn the handle 6610 to unscrew the bolt 6608 from the fixing seat 6609, close the control valve 62 on the branch pipe 61 where the heat-conducting tube bundle 64 to be maintained is located, open the control valve 62 on the other branch pipe 61, step on the pedal 6629 to lower the limit plate 6626, and release the locking of the connecting plate 6603. Spring 6613 pushes sliding plate 6611 to slide outward from slide rail 6604, causing follower plate 6615 to compress airbag 6616. Rotating knob 6621 moves knob 6621 on throat joint 6620, causing throat joint 6620 to press delivery pipe 6617, changing the cross-sectional area of ​​delivery pipe 6617, thereby increasing the resistance of air flow from airbag 6616 to airbag 6622, causing sliding plate 6611 to drive heat conduction tube bundle 64 to slide out of distribution box 67 at a uniform speed.

[0039] As requested by the property owners, most areas in northern China currently use heating during the winter and generate electricity during the other seasons. Southern cities generate electricity at all four levels.

[0040] Project economic analysis based on (20m) 3 Taking (min pure gas for winter heating and power generation in other seasons) as an example

[0041]

[0042]

[0043]

[0044] Economic analysis of the equipment shows that the carbon emission reduction device will generate approximately 17.486 million yuan per year, with a payback period of 1.78 years. Therefore, the comprehensive utilization of low-concentration coal mine gas and ventilation gas through flameless regenerative thermal oxidation is highly meaningful.

[0045] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A flameless oxidation and comprehensive utilization system for low-concentration coal mine gas and ventilation gas, characterized in that, include: A gas pumping pipe (1) is connected to a water seal flame arrestor and explosion relief device (4), the water seal flame arrestor and explosion relief device (4) is connected to a gas transmission pipe (8), and the gas transmission pipe (8) is connected to a primary mixer (16), and the primary mixer (16) is connected to a primary mixing gas pipe (17). Air delivery pipe 1 (9), the air delivery pipe 1 (9) is connected to a primary mixing fan (10), the primary mixing fan (10) is connected to a primary mixer (16); A gas exhaust pipe (12) is connected to a bag filter (13), the bag filter (13) is connected to a gas exhaust fan (14), the gas exhaust fan (14) is connected to a primary mixer (16), and a primary mixing gas pipe (17) is connected to a secondary mixer (24), the secondary mixer (24) is connected to a secondary mixing gas pipe (25), and the secondary mixing gas pipe (25) is connected to an RTO fan (30). A bed-type regenerative thermal oxidation device (32) is connected to an RTO blower (30). The bed-type regenerative thermal oxidation device (32) is connected to a high-temperature flue gas pipe (33). The high-temperature flue gas pipe (33) is connected to a waste heat boiler (34). The waste heat boiler (34) is equipped with a boiler drum (35). The boiler drum (35) is connected to a high-pressure superheated steam pipe (36). The high-pressure superheated steam pipe (36) is connected to a desuperheater and pressure reducer (38) and a main steam valve (41). The desuperheater and pressure reducer (38) is connected to a steam-water heat exchanger (39). The main steam valve (41) is connected to a steam turbine generator (42). A desalination filter tank (54) is connected to a high-pressure pump (55), the high-pressure pump (55) is connected to a reverse osmosis membrane module (56) and a pure water delivery pipe (57), the pure water delivery pipe (57) is connected to a deaerator (51), the deaerator (51) is connected to an economizer body (52), the economizer body (52) is equipped with a maintenance device, and the economizer body (52) is connected to a boiler drum (35), the economizer body (52) is connected to a flue pipe (53), and the flue pipe (53) is connected to a chimney (60).

2. The comprehensive utilization system for low-concentration coal mine gas and exhaust gas using flameless oxidation according to claim 1, characterized in that, The gas pumping pipe (1) is equipped with an automatic explosion-proof device (2), an automatic powder fire extinguishing device (3), a water seal fire-resistant and explosion-proof device (4), a concentration detector (5), a safety relief valve (6), and a gas valve (7). The air supply pipe (9) is equipped with an air regulating valve (11). The primary mixing gas pipe (17) is equipped with a concentration detector (18), a temperature detector (19), a safety relief valve (20), and a secondary mixing valve (21). The exhaust gas pipe (12) is equipped with a control valve (15). The air supply pipe (23) is equipped with an air valve (2). 2) A concentration detector (26), a regenerative thermal oxidation device valve (27), a safety relief valve (28), a secondary mixing valve (29), and a fire damper (31) are installed on the secondary mixing gas pipe (25). A hot water circulation pump (40) is installed on the steam-water heat exchanger (39). A gearbox (43) and a generator (44) are connected to the steam turbine generator (42). A condenser (45) is connected to the steam turbine generator (42). A cooling tower (46) and a water pump (47) are connected to the condenser (45). A main steam valve (37) is installed on the high-pressure superheated steam pipe (36).

3. The comprehensive utilization system for low-concentration coal mine gas and exhaust gas using flameless oxidation according to claim 2, characterized in that, The condenser (45) is connected to a second water pump (48), the second water pump (48) is connected to a third water pump (49), and the third water pump (49) is connected to a condensate pipe (50), which is connected to a pure water delivery pipe (57).

4. The comprehensive utilization system for low-concentration coal mine gas and exhaust gas using flameless oxidation according to claim 1, characterized in that, The maintenance device includes two diversion pipes (61), both of which are installed on valve two (27) of the thermal regenerative oxidation device. Each of the two diversion pipes (61) is equipped with a diversion box (67). Two symmetrical control valves (62) are installed on the outside of each diversion pipe (61), and two symmetrical support frames (63) are fixedly connected to the bottom of each diversion box (67). Each diversion box (67) is equipped with a heat-conducting tube bundle (64), and two connecting joints (65) are fixedly connected to each heat-conducting tube bundle (64). A non-stop maintenance module (66) is installed on the outside of each diversion box (67).

5. A comprehensive utilization system for low-concentration coal mine gas and exhaust gas using flameless oxidation, as described in claim 4, is characterized in that... Both of the aforementioned non-stop maintenance modules (66) include a closing plate (6601). A fixing plate (6605) is fixedly connected to the side of the closing plate (6601) near the distribution box (67). Two symmetrical constraint plates (6602) are fixedly connected to the outside of the fixing plate (6605). The opposite side of the two constraint plates (6602) is fixedly connected to the outside of the heat-conducting tube bundle (64) on the same side. A sealing ring (6606) is provided on the outside of the fixing plate (6605). The sealing ring (6606) is fixedly connected to the opposite side of the closing plate (6601). A cut is provided on the distribution box (67). The inner wall of the cut is slidably connected to the outside of the constraint plate (6602). The sealing ring (6606) is attached to the opposite side of the distribution box (67).

6. The comprehensive utilization system for low-concentration coal mine gas and exhaust gas using flameless oxidation according to claim 5, characterized in that, Both closed plates (6601) are fixedly connected to a base (6607) on the outside. Bolts (6608) are provided on each base (6607). A fixing seat (6609) is provided on the outside of each bolt (6608). The fixing seat (6609) is fixedly connected to the side opposite to the diversion box (67). A rotating handle (6610) is fixedly connected to the end of each bolt (6608) away from the diversion box (67). A slide rail (6604) is fixedly connected to the bottom of each diversion box (67). 04) Sliding plates (6611) are slidably connected inside each sliding plate (6611). Connecting plates (6603) are fixedly connected to the outside of each sliding plate (6611). The connecting plates (6603) are fixedly connected to the side opposite to the closing plate (6601). A groove (6612) is opened on the upper side of each sliding plate (6611). A spring (6613) is fixedly connected to the inner wall of each groove (6612). The end of the spring (6613) away from the groove (6612) is fixedly connected to the bottom of the diversion box (67) on the same side.

7. A comprehensive utilization system for low-concentration coal mine gas and exhaust gas using flameless oxidation, as described in claim 6, is characterized in that... Both slide rails (6604) have two symmetrical grooves (6614) on their exteriors. A follower plate (6615) is slidably connected within each groove (6614). The follower plate (6615) is fixedly connected to the side opposite to the slide plate (6611). An airbag (6616) is fixedly connected to the exterior of each follower plate (6615). A delivery pipe (6617) is fixedly connected to the exterior of each airbag (6616). A positioning plate (6618) is fixedly connected to the exterior of each delivery pipe (6617). The positioning plate (6618) is fixedly connected to the side opposite to the slide rail (6604), and the outside of the conveying pipe (6617) is provided with a mounting plate (6619). The outside of the mounting plate (6619) is fixedly connected to the bottom of the diversion box (67). The outside of the conveying pipe (6617) is provided with a throat joint (6620). The outside of the throat joint (6620) is provided with a knob (6621). The throat joint (6620) is fixedly connected to the side opposite to the mounting plate (6619) on the same side.

8. The comprehensive utilization system for low-concentration coal mine gas and exhaust gas without flame oxidation according to claim 7, characterized in that, Two airbags (6622) are fixedly connected to the ends of the two delivery pipes (6617) away from the first airbag (6616). One end of the second airbag (6622) is fixedly connected to the outside of the mounting plate (6619), and the other end is fixedly connected to the stabilizing seat (6624). Two symmetrical rectangular grooves (6623) are opened at the bottom of the diversion box (67). The outside of the stabilizing seat (6624) is slidably connected to the inner wall of the rectangular groove (6623) on the same side. An extension plate (6625) is fixedly connected to the outside of the diversion box (67).

9. A comprehensive utilization system for low-concentration coal mine gas and exhaust gas using flameless oxidation, as described in claim 8, is characterized in that... Both of the extension plates (6625) have narrow openings, and limit plates (6626) are slidably connected inside the narrow openings. Both of the connecting plates (6603) have slots, and the inner walls of the slots are engaged with the outside of the limit plates (6626). The bottom of the diversion box (67) is fixedly connected with a fixing frame (6627).

10. A comprehensive utilization system for low-concentration coal mine gas and exhaust gas using flameless oxidation, as described in claim 9, is characterized in that... Two symmetrical springs (6628) are fixedly connected to the bottom of each of the two limiting plates (6626). The bottom ends of the springs (6628) are fixedly connected to the outside of the fixing frame (6627). A step plate is fixedly connected to the outside of each limiting plate (6626). A pedal (6629) is movably connected to each fixing frame (6627). A torsion spring (6630) is provided between the pedal (6629) and the fixing frame (6627). The outside of the pedal (6629) is in contact with the outside of the step plate.

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