Coal mine ventilation air methane synergistic enrichment and fluidization heat accumulation combustion system and method

Abstract

The present application provides a coal mine ventilation air methane (VAM) synergistic enrichment and fluidized heat accumulation combustion system and method; the system comprises a ventilation shaft diffusion tower and a ventilation air collection device; the method comprises the following steps: VAM collection and compression, adsorption tower temperature reduction and pressure increase, adsorption tower pressure reduction, adsorption tower temperature increase and pressure reduction, adsorption tower pressure increase, adsorption tower periodic cycle operation, regenerative furnace packed bed preheating, coal gangue and VAM fluidized heat accumulation oxidation, and waste heat recovery and utilization. The present application can realize safe and efficient enrichment of VAM, coupled utilization of concentrated VAM and coal gangue particle fluidized heat accumulation oxidation, and use of oxidation waste heat as a heat source for a generator; a large coal mine VAM "scale separation and concentration - synergistic oxidation - efficient utilization" carbon reduction scheme is formed, which helps the coal industry to achieve the "two waste" target and sustainable development, and can safely and efficiently dispose and utilize the large flow of VAM discharged by large low-gas mines at low cost.

Description

Technical Field

[0001] This invention relates to the field of synergistic enrichment and fluidized bed thermal combustion technology for coal mine exhaust gas, and particularly to a system and method for synergistic enrichment and fluidized bed thermal combustion of coal mine exhaust gas. Background Technology

[0002] The exhaust gas in underground coal mines also contains a high concentration of water vapor and coal dust, making gas utilization difficult under high humidity and dust conditions.

[0003] For my country's extra-large low-gas mines, due to the lack of high-concentration extracted gas sources, the cascade regenerative thermal oxidation utilization of high and low concentration gas is not feasible. It is necessary to concentrate the exhaust gas before it can be utilized. The key challenges in this field are how to develop a novel methane absorption / adsorption material with high selectivity and stability, and how to clarify the adsorption and separation mechanism of exhaust gas under high humidity and dust conditions. This would allow for temperature and pressure coordinated adsorption and separation, enabling the coupled utilization of concentrated gas (1%-2%) with fluidized coal gangue particles through regenerative thermal oxidation, achieving "waste-to-waste treatment." Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a coal mine exhaust gas synergistic enrichment and fluidized regenerative combustion system and method.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A coal mine exhaust gas synergistic enrichment and fluidized thermal regenerative combustion system includes an air shaft diffusion tower, exhaust gas collection device, gas enrichment mechanism, temperature control mechanism, thermal regenerative combustion mechanism, exhaust gas treatment mechanism, and waste heat recovery and utilization mechanism.

[0007] The gas enrichment and enhancement mechanism includes a compressor, a solenoid valve assembly, an adsorption tower assembly, a vacuum pump, a buffer tank, a flow meter, a waste gas 47, and a methane concentration sensor. The outlet of the waste gas is connected to the waste gas collection device. One end of the compressor is connected to the waste gas collection device, and the other end of the compressor is connected to the adsorption tower assembly via the solenoid valve assembly. One end of the buffer tank is connected to the adsorption tower assembly via the solenoid valve assembly, and the other end of the buffer tank is connected to the methane concentration sensor via the flow meter.

[0008] The temperature control mechanism includes a refrigeration system, a heating system, a cold / hot liquid jacket, a methane adsorption module 11, and a spiral tube heat exchanger. The cold / hot liquid jacket is connected to the refrigeration system and the heating system via a solenoid valve assembly. The cold / hot liquid jacket is wrapped around the outside of the adsorption tower assembly body, and the inside of the cold / hot liquid jacket is connected to the spiral tube heat exchanger on the inner wall of the adsorption tower assembly.

[0009] Preferably, the regenerative combustion mechanism includes a regenerative furnace body, a distribution plate is fixedly provided at the bottom of the inner cavity of the regenerative furnace body, an air chamber is formed between the distribution plate, the regenerative furnace body and the bottom plate, the bottom plate is provided with a gas enrichment inlet communicating with the air chamber, an ash hopper, a starter igniter and a screw feeder are provided on the side wall of the regenerative furnace body, the ash hopper, the starter igniter, the coal gangue feed hopper 27 and the screw feeder are arranged above the distribution plate, the coal gangue feed hopper is connected to the interior of the regenerative furnace body through the screw feeder, and a superheated chamber is provided at the top of the inner cavity of the regenerative furnace body;

[0010] The gas enrichment inlet is connected to the waste heat recovery and utilization mechanism.

[0011] Preferably, the exhaust gas treatment mechanism includes a cyclone separator, a flue, an electrostatic precipitator, and an induced draft fan. The solid-gas input end at the top of the cyclone separator is connected to the flue gas outlet located below the superheated chamber of the regenerator furnace body. The solid discharge end at the bottom of the cyclone separator is connected to the regenerator return port located above the distribution plate of the regenerator furnace body. One end of the flue is connected to the flue gas discharge port at the top of the cyclone separator, and the other end of the flue is connected to the induced draft fan after passing through the electrostatic precipitator.

[0012] The waste heat recovery and utilization mechanism includes a boiler drum, an economizer, and a steam superheater. The economizer, including a heat exchange structure, is located inside the flue. The steam superheater, including a heat exchange structure, is located inside the superheater chamber. The boiler drum's working fluid inlet is connected to the boiler drum's working fluid outlet. The boiler drum's working fluid outlet is connected to the second economizer inlet of the economizer. One side of the economizer is connected to the first economizer inlet. The economizer's economizer outlet is connected to the boiler drum's saturated steam inlet. The boiler drum's saturated steam outlet is connected to the steam superheater inlet of the steam superheater. The steam superheater outlet of the steam superheater is connected to the steam generator via an electric transmission pipeline.

[0013] The lower end of the economizer outlet is provided with a preheater inlet and a preheater outlet. A preheater is installed through both the preheater inlet and the preheater outlet. The preheater is connected to a methane concentration sensor and a regenerative combustion mechanism.

[0014] Preferably, the distribution plate is densely and evenly distributed with perforated holes, and a conical wind cap is installed on the perforated holes. The side of the conical wind cap is provided with either a small hole or a side slit.

[0015] The working fluid used in the refrigeration system, heating system, and boiler drum is deionized water.

[0016] Preferably, the methane adsorption module is prepared by assembling a methane adsorption material with a honeycomb active carrier that has ultra-low gas resistance and high separation performance.

[0017] Preferably, the spiral tube heat exchanger is composed of any one of stainless steel and alloy materials that are resistant to high temperature, high pressure and corrosion.

[0018] Preferably, the solenoid valve assembly includes a first solenoid valve, a second solenoid valve, a third solenoid valve, a fourth solenoid valve, a fifth solenoid valve, a sixth solenoid valve, a seventh solenoid valve, an eighth solenoid valve, a ninth solenoid valve, a tenth solenoid valve, an eleventh solenoid valve, a twelfth solenoid valve, a thirteenth solenoid valve, a fourteenth solenoid valve, and a fifteenth solenoid valve.

[0019] The compressor is connected to the first solenoid valve and the second solenoid valve. Both the first solenoid valve and the second solenoid valve are connected to the adsorption tower assembly. The third solenoid valve and the fourth solenoid valve are respectively located at the upper ends of the first solenoid valve and the second solenoid valve, and are connected to each other. The vacuum pump is connected to the third solenoid valve and the fourth solenoid valve. The third solenoid valve is connected to the first solenoid valve, and the fourth solenoid valve is connected to the second solenoid valve.

[0020] The refrigeration system has an eleventh solenoid valve, a ninth solenoid valve, a seventh solenoid valve and a fifth solenoid valve connected in parallel from top to bottom at both ends. The eleventh solenoid valve, the ninth solenoid valve, the seventh solenoid valve and the fifth solenoid valve are all connected to the adsorption tower assembly.

[0021] The heating system has a twelfth solenoid valve, a tenth solenoid valve, an eighth solenoid valve and a sixth solenoid valve connected in parallel from top to bottom at both ends. The twelfth solenoid valve, the tenth solenoid valve, the eighth solenoid valve and the sixth solenoid valve are all connected to the adsorption tower assembly.

[0022] The upper end of the adsorption tower assembly is connected in series with a thirteenth solenoid valve and a fourteenth solenoid valve, and a fifteenth solenoid valve is connected between the thirteenth solenoid valve and the fourteenth solenoid valve.

[0023] Preferably, the adsorption tower assembly includes an adsorption tower during adsorption preparation and an adsorption tower in a regeneration state;

[0024] The eleventh solenoid valve and the fifth solenoid valve are respectively connected to the upper and lower ends of the adsorption tower in the regeneration state, and the ninth solenoid valve and the seventh solenoid valve are respectively connected to the upper and lower ends of the adsorption tower during the adsorption preparation period.

[0025] The twelfth and sixth solenoid valves are respectively connected to the upper and lower ends of the adsorption tower during the adsorption preparation period, and the tenth and eighth solenoid valves are respectively connected to the upper and lower ends of the adsorption tower during the regeneration period.

[0026] Preferably, the flue outlet is connected to an electrostatic precipitator.

[0027] This invention also proposes a method for synergistic enrichment and fluidized bed combustion of coal mine exhaust gas, applicable to the aforementioned coal mine exhaust gas synergistic enrichment and fluidized bed combustion system, comprising the following steps:

[0028] S1. Exhaust gas collection and compression: Exhaust gas is discharged from the mine through the ventilation shaft diffusion tower, collected by the zero-resistance rotary exhaust gas collection device, and then pressurized by the compressor before entering the adsorption tower assembly.

[0029] S2. Adsorption Tower Cooling and Pressurization Adsorption: Open the seventh and ninth solenoid valves to start the refrigeration system. The cold liquid flows from the refrigeration system into the cold / hot liquid jacket and spiral tube heat exchanger through the seventh solenoid valve, and flows out through the ninth solenoid valve. When the methane adsorption module in the adsorption tower during the adsorption preparation period cools down to the optimal adsorption temperature, open the first and thirteenth solenoid valves to inject the pressurized exhaust gas into the adsorption tower during the adsorption preparation period at a gas pressure slightly higher than the optimal adsorption pressure in the adsorption tower components, until the pressure in the adsorption tower during the adsorption preparation period reaches the optimal adsorption pressure. At the same time, the impurity gas is discharged through the thirteenth solenoid valve. During the adsorption process, it is necessary to maintain the dynamic stability of the temperature and pressure in the tower.

[0030] S3, Pressure Drop of Adsorption Tower: When the methane adsorption module in the adsorption tower is about to reach saturation adsorption during the adsorption preparation period, close all solenoid valves and open the fifteenth solenoid valve connecting the adsorption tower in the adsorption preparation period and the adsorption tower in the regeneration state. At this time, pressure balance is achieved between the adsorption tower in the adsorption preparation period and the adsorption tower in the regeneration state. As the gas flows, the pressure in the high-pressure adsorption tower gradually decreases, while the pressure in the low-pressure regeneration tower gradually increases. When the pressure reaches or approaches the equilibrium state, close the fifteenth solenoid valve.

[0031] S4. Desorption by heating and depressurizing in the adsorption tower: Open the sixth and twelfth solenoid valves to start the heating system. The hot liquid flows from the heating system into the cold / hot liquid jacket and spiral tube heat exchanger through the sixth solenoid valve and flows out through the twelfth solenoid valve. When the temperature reaches the optimal desorption temperature, open the third solenoid valve and the vacuum pump. The methane adsorption module in the adsorption tower during the adsorption preparation period begins desorption. During the desorption process, when the methane concentration sensor detects that the methane concentration of the concentrated gas is too high, the second and fourth solenoid valves can be opened to mix with the exhaust gas to achieve the target methane concentration. The mixed concentrated gas enters the buffer tank for buffering. After passing through the flow meter and the methane concentration sensor, it is fed into the regenerator for further processing. At the same time, the methane concentration sensor monitors the concentration of the concentrated gas in real time and feeds back to the third and fourth solenoid valves to control the gas flow rate, so as to adjust the concentration of the concentrated gas until the desorption is completed.

[0032] S5. Pressure Equalization Rise in Adsorption Tower: After desorption is completed in the adsorption tower during the adsorption preparation period, close all solenoid valves and open the fifteenth solenoid valve connecting the adsorption tower during the adsorption preparation period and the adsorption tower in the regeneration state. At this time, pressure balance is achieved between the adsorption tower during the adsorption preparation period and the adsorption tower in the regeneration state. As the gas flows, the pressure in the high-pressure adsorption tower gradually decreases, while the pressure in the low-pressure regeneration tower gradually increases. When the pressure reaches equilibrium or is close to equilibrium, close the fifteenth solenoid valve, thus completing one cycle.

[0033] S6. Cyclic operation of adsorption towers: When one adsorption tower component is in the adsorption state, the other adsorption tower component must be in the desorption state. During the operation of the two adsorption towers, the cyclic operation state of S2-S5 is repeated alternately to ensure a continuous and stable supply of concentrated gas to the regenerator.

[0034] S7. Preheating of the regenerator bed: When the adsorption tower assembly desorbs for the first time, the flow rate of the enriched gas inlet is adjusted by the flow meter to make the regenerator bed reach the optimal bubbling fluidization state. The concentration of the enriched gas inlet is adjusted to above 70% by the methane concentration sensor and solenoid valve assembly. The enriched gas is controlled to enter the furnace after being introduced into the air chamber through the enriched gas inlet and evenly distributed by the distribution plate. The starter igniter is turned on to ignite the regenerator bed and preheat it to 700-800℃. The generated high-temperature flue gas flows upward along the regenerator body and is then discharged through the cyclone separator, flue, electrostatic precipitator and induced draft fan.

[0035] S8. Coal gangue and gas fluidized bed regenerative oxidation: After preheating, adjust the concentration of enriched gas to 1-2%, start the screw feeder to continuously feed, and the coal gangue particles enter the furnace of the regenerative furnace from the coal gangue feeding bin to co-combust with the enriched gas. The regenerative particles and the unburned coal gangue particles rise under the action of air lift and enter the cyclone separator through the flue gas outlet. After being separated from the high temperature flue gas in the cyclone separator, they return to the bottom of the regenerative filling bed through the regenerative return port. The ash produced after combustion is discharged through the ash bin. The particulate pollutants in the high temperature flue gas are removed by the electrostatic precipitator through the flue and then discharged by the induced draft fan.

[0036] S9. Waste Heat Recovery and Utilization: After combustion stabilizes, the working fluid is controlled to enter the boiler drum through the economizer inlet and the boiler drum working fluid inlet, and then enters the economizer arranged in the flue through the boiler drum working fluid outlet. The steam generated after being heated by the economizer first enters the boiler drum through the saturated steam inlet, and then enters the steam superheater located in the superheater chamber for secondary heating through the saturated steam outlet and the steam superheater inlet. The superheated steam generated after secondary heating enters the steam generator through the steam superheater outlet. The electrical energy generated by the steam generator is connected to the waste air collection device, compressor, vacuum pump, refrigeration system and heating system through the electric transmission pipeline to realize waste heat recovery and utilization.

[0037] The beneficial effects of this invention are:

[0038] 1. In response to the current situation of extra-large low-gas mines, this application proposes a new scheme for the low-carbon utilization of exhaust gas in underground coal mines. This scheme involves enriching and reusing exhaust gas to form a safe and low-energy-consumption enrichment method, and coupling it with fluidized coal gangue particles for regenerative thermal oxidation. This achieves fluidized coal gangue and waste gas with ultra-high efficiency utilization, solving the problem of low utilization rate of exhaust gas. Through variable temperature and pressure synergistic enrichment technology, safe and efficient enrichment of exhaust gas is achieved. The enriched gas (1%-2%) is coupled with the fluidized coal gangue particles for regenerative thermal oxidation, and the waste heat from oxidation is used as a heat source for generators, realizing "waste treatment with waste".

[0039] 2. The zero-resistance rotary exhaust gas collection device achieves zero resistance to mine ventilation, effectively improves the collection efficiency of low-concentration methane (exhaust gas) in the coal mine outlet diffusion tower, reduces the direct emission of this greenhouse gas, and achieves effective resource recovery.

[0040] 3. By using the temperature and pressure swing synergistic enrichment technology, the adsorption capacity of methane adsorbent is improved, solving the problems of high energy consumption and low yield in the traditional single pressure swing adsorption separation and enrichment of low-concentration methane. It effectively improves the enrichment efficiency of exhaust gas in extra-large underground coal mines, making it easier to reach the concentration range of efficient combustion. It has the characteristics of high yield, high purity, low energy consumption, safety and stability.

[0041] 4. The waste heat from the subsequent fluidized bed thermal storage oxidation is used as a heat source for the generator, which effectively recovers the heat energy generated during the fluidized bed thermal storage combustion reaction, and can provide power to the electrical equipment in the entire system, greatly improving the overall thermal efficiency of the system.

[0042] 5. The gas, after being efficiently enriched, reduces the amount of greenhouse gases emitted directly into the atmosphere, especially methane emissions. It is particularly suitable for the large-volume, low-cost, safe and efficient treatment and utilization of exhaust gas from extra-large low-gas mines. Attached Figure Description

[0043] Figure 1 This is a connection structure diagram of the coal mine exhaust gas synergistic enrichment and fluidized thermal regenerative combustion system proposed in this invention;

[0044] In the diagram: 1. Ventilation shaft diffusion tower; 2. Exhaust air collection device; 3. Compressor; 4. Solenoid valve assembly; 4-1 First solenoid valve; 4-2 Second solenoid valve; 4-3 Third solenoid valve; 4-4 Fourth solenoid valve; 4-5 Fifth solenoid valve; 4-6 Sixth solenoid valve; 4-7 Seventh solenoid valve; 4-8 Eighth solenoid valve; 4-9 Ninth solenoid valve; 4-10 Tenth solenoid valve; 4-11 Eleventh solenoid valve; 4-12 Twelfth solenoid valve; 4-13 Thirteenth solenoid valve; 4-14 Fourteenth solenoid valve; 4-15 Fifteenth solenoid valve; 5. Adsorption tower assembly; 5-1 Adsorption tower during adsorption preparation; 5-2 Adsorption tower in regeneration state; 6. Vacuum pump; 7. Refrigeration system; 8. Heating system; 9. Cold / hot liquid jacket; 10. Spiral tube heat exchanger; 11. Methane adsorption module; 12. Buffer tank; 13. Flow meter; 14. Methane concentration sensor. 15. Sensor, 16. Regenerator body, 17. Cyclone separator, 18. Flue, 19. Electrostatic precipitator, 20. Exhaust fan, 21. Distribution plate, 22. Bottom plate, 23. Air chamber, 24. Enriched gas inlet, 25. Ash silo, 26. Starter igniter, 27. Screw feeder, 28. Coal gangue feed silo, 29. Superheater, 30. Flue gas outlet, 31. Flue gas discharge port, 32. Regenerator return port, 33. Steam superheater, 34. Economizer, 35. Preheater, 36. First economizer inlet, 37. Boiler drum, 38. Boiler drum working fluid inlet, 39. Second economizer inlet, 40. Economizer outlet, 41. Saturated steam inlet, 42. Saturated steam outlet, 43. Steam superheater inlet, 44. Steam superheater outlet, 45. Steam generator, 46. Electricity transmission pipeline, 47. Exhaust gas, 48. Preheater inlet, 49. Preheater outlet. Detailed Implementation

[0045] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0046] Reference Figure 1 A coal mine exhaust gas synergistic enrichment and fluidized thermal regenerative combustion system includes an exhaust gas diffuser tower 1, an exhaust gas collection device 2, a gas enrichment mechanism, a temperature control mechanism, a thermal regenerative combustion mechanism, a tail gas treatment mechanism, and a waste heat recovery and utilization mechanism.

[0047] The gas enrichment and enhancement mechanism includes a compressor 3, a solenoid valve assembly 4, an adsorption tower assembly 5, a vacuum pump 6, a buffer tank 12, a flow meter 13, and a methane concentration sensor 14. The outlet of the exhaust gas 47 is connected to the exhaust gas collection device 2, which is a zero-resistance exhaust gas collection device that can achieve zero resistance to mine ventilation and efficiently and with low energy consumption capture low concentrations of exhaust gas from the source. One end of the compressor 3 is connected to the exhaust gas collection device 2, and the other end of the compressor 3 is connected to the adsorption tower assembly 5 via the solenoid valve assembly 4. One end of the buffer tank 12 is connected to the adsorption tower assembly 5 via the solenoid valve assembly 4, and the other end of the buffer tank 12 is connected to the methane concentration sensor 14 via the flow meter 13. Temperature / pressure sensors are installed at different axial / radial positions inside the adsorption tower assembly 5 to monitor the temperature and pressure changes inside the adsorption tower in real time.

[0048] The temperature control mechanism includes a refrigeration system 7, a heating system 8, a cold / hot liquid jacket 9, and a spiral tube heat exchanger 10. The cold / hot liquid jacket 9 is connected to the refrigeration system 7 and the heating system 8 through a solenoid valve assembly 4. The cold / hot liquid jacket 9 is wrapped around the outside of the adsorption tower assembly 5. The inside of the cold / hot liquid jacket 9 is connected to the spiral tube heat exchanger 10 on the inner wall of the adsorption tower assembly 5.

[0049] In this invention, the regenerative combustion mechanism includes a regenerative furnace body 15. A distribution plate 20 is fixedly provided at the bottom of the inner cavity of the regenerative furnace body 15. A wind chamber 22 is formed between the distribution plate 20, the regenerative furnace body 15, and the bottom plate 21. A gas enrichment inlet 23 communicating with the wind chamber 22 is provided on the bottom plate 21. An ash bin 24, a starter igniter 25, and a screw feeder 26 are provided on the side wall of the regenerative furnace body 15. The ash bin 24, the starter igniter 25, and the screw feeder 26 are arranged above the distribution plate 20. A coal gangue feeding bin 27 is connected to the interior of the regenerative furnace body 15 through the screw feeder 26. A superheated chamber 28 is provided at the top of the inner cavity of the regenerative furnace body 15.

[0050] The gas enrichment inlet 23 is connected to the waste heat recovery and utilization unit.

[0051] In this invention, the exhaust gas treatment mechanism includes a cyclone separator 16, a flue 17, an electrostatic precipitator 18, and an induced draft fan 19. The solid-gas input end at the top of the cyclone separator 16 is connected to the flue gas outlet 29 of the regenerator furnace body 15 located below the superheated chamber 28. The solid discharge end at the bottom of the cyclone separator 16 is connected to the regenerator body return port 31 of the regenerator furnace body 15 located above the distribution plate 20. One end of the flue 17 is connected to the flue gas discharge port 30 at the top of the cyclone separator 16, and the other end of the flue 17 is connected to the induced draft fan 19 after passing through the electrostatic precipitator 18.

[0052] The waste heat recovery and utilization mechanism includes a boiler drum 36, an economizer 33, and a steam superheater 32. The economizer 33, including a heat exchange structure, is located inside the flue 17, and the steam superheater 32, including a heat exchange structure, is located inside the superheat chamber 28. The boiler drum working fluid inlet 37 of the boiler drum 36 is connected to the boiler drum working fluid outlet 38. The boiler drum working fluid outlet 38 of the boiler drum 36 is connected to the second economizer inlet 39 of the economizer 33. The first economizer inlet 35 is connected to one side of the economizer 33. The economizer outlet 40 of the economizer 33 is connected to the saturated steam inlet 41 of the boiler drum 36. The saturated steam outlet 42 of the boiler drum 36 is connected to the steam superheater inlet 43 of the steam superheater 32. The steam superheater outlet 44 of the steam superheater 32 and the steam generator 45 are connected together by an electric transmission pipeline 46.

[0053] The lower end of the economizer outlet 40 is provided with a preheater inlet 48 and a preheater outlet 49. A preheater 34 is installed through both the preheater inlet 48 and the preheater outlet 49. The preheater 34 is connected to the methane concentration sensor 14 and the regenerative combustion mechanism.

[0054] In this invention, the distribution plate 20 is densely and evenly distributed with perforated holes, and a conical wind cap is installed on the perforated holes. The side of the conical wind cap is provided with either a small hole or a side slit.

[0055] The working fluid used in the refrigeration system 7, heating system 8, and boiler drum 36 is deionized water; this is to avoid the formation of scale inside the equipment and pipes, which could affect the operation of the equipment.

[0056] In this invention, the methane adsorption module 11 is prepared by assembling a methane adsorption material with an ultra-low gas resistance and high separation capacity honeycomb active carrier; that is, a low gas resistance straight-pore methane adsorption module is prepared by assembling and compounding a methane adsorption material with an ultra-low gas resistance and high separation capacity honeycomb active carrier.

[0057] The methane adsorption module 11 uses a new material, Mzn-ZIFs, for adsorbing exhaust gas.

[0058] In this invention, the spiral tube heat exchanger 10 is composed of any one of stainless steel and alloy materials that are resistant to high temperature, high pressure and corrosion.

[0059] In this invention, the solenoid valve assembly 4 includes a first solenoid valve 4-1, a second solenoid valve 4-2, a third solenoid valve 4-3, a fourth solenoid valve 4-4, a fifth solenoid valve 4-5, a sixth solenoid valve 4-6, a seventh solenoid valve 4-7, an eighth solenoid valve 4-8, a ninth solenoid valve 4-9, a tenth solenoid valve 4-10, an eleventh solenoid valve 4-11, a twelfth solenoid valve 4-12, a thirteenth solenoid valve 4-13, a fourteenth solenoid valve 4-14, and a fifteenth solenoid valve 4-15.

[0060] The compressor 3 is connected to the first solenoid valve 4-1 and the second solenoid valve 4-2. The first solenoid valve 4-1 and the second solenoid valve 4-2 are both connected to the adsorption tower assembly 5. The third solenoid valve 4-3 and the fourth solenoid valve 4-4 are respectively located at the upper ends of the first solenoid valve 4-1 and the second solenoid valve 4-2, and the third solenoid valve 4-3 and the fourth solenoid valve 4-4 are connected. The vacuum pump 6 is connected to the third solenoid valve 4-3 and the fourth solenoid valve 4-4. The third solenoid valve 4-3 is connected to the first solenoid valve 4-1, and the fourth solenoid valve 4-4 is connected to the second solenoid valve 4-2.

[0061] The refrigeration system 7 has an eleventh solenoid valve 4-11, a ninth solenoid valve 4-9, a seventh solenoid valve 4-7 and a fifth solenoid valve 4-5 connected in parallel from top to bottom at both ends. The eleventh solenoid valve 4-11, the ninth solenoid valve 4-9, the seventh solenoid valve 4-7 and the fifth solenoid valve 4-5 are all connected to the adsorption tower assembly 5.

[0062] The heating system 8 has a twelfth solenoid valve 4-12, a tenth solenoid valve 4-10, an eighth solenoid valve 4-8 and a sixth solenoid valve 4-6 connected in parallel from top to bottom at both ends. The twelfth solenoid valve 4-12, the tenth solenoid valve 4-10, the eighth solenoid valve 4-8 and the sixth solenoid valve 4-6 are all connected to the adsorption tower assembly 5.

[0063] The upper end of the adsorption tower assembly 5 is connected in series with a thirteenth solenoid valve 4-13 and a fourteenth solenoid valve 4-14, and a fifteenth solenoid valve 4-15 is connected between the thirteenth solenoid valve 4-13 and the fourteenth solenoid valve 4-14.

[0064] In this invention, the adsorption tower assembly 5 includes an adsorption tower 5-1 during adsorption preparation and an adsorption tower 5-2 in the regeneration state.

[0065] The eleventh solenoid valve 4-11 and the fifth solenoid valve 4-5 are respectively connected to the upper and lower ends of the adsorption tower 5-2 in the regeneration state, and the ninth solenoid valve 4-9 and the seventh solenoid valve 4-7 are respectively connected to the upper and lower ends of the adsorption tower 5-1 during the adsorption preparation period.

[0066] The twelfth solenoid valve 4-12 and the sixth solenoid valve 4-6 are respectively connected to the upper and lower ends of the adsorption tower 5-1 during the adsorption preparation period, and the tenth solenoid valve 4-10 and the eighth solenoid valve 4-8 are respectively connected to the upper and lower ends of the adsorption tower 5-2 during the regeneration period.

[0067] In this invention, the outlet end of the flue 17 is connected to an electrostatic precipitator 18, which can remove particulate pollutants such as dust from the flue gas after combustion.

[0068] This invention also proposes a method for synergistic enrichment and fluidized bed combustion of coal mine exhaust gas, applicable to the aforementioned coal mine exhaust gas synergistic enrichment and fluidized bed combustion system, characterized by comprising the following steps:

[0069] S1. Exhaust gas collection and compression: Exhaust gas 47 is discharged from the mine through the ventilation shaft diffusion tower 1, collected by the zero-resistance rotary exhaust gas collection device 2, and pressurized by the compressor 3 before entering the adsorption tower assembly 5.

[0070] S2. Adsorption Tower Cooling and Pressurization Adsorption: Open the seventh solenoid valve 4-7 and the ninth solenoid valve 4-9, start the refrigeration system 7, and the cold liquid flows from the refrigeration system 7 into the cold / hot liquid jacket 9 and the spiral tube heat exchanger 10 through the seventh solenoid valve 4-7, and flows out through the ninth solenoid valve 4-9. When the methane adsorption module 11 in the adsorption tower 5-1 during the adsorption preparation period cools down to the optimal adsorption temperature, open the first solenoid valve 4-1 and the thirteenth solenoid valve 4-13, and inject the pressurized exhaust gas 47 into the adsorption tower 5-1 during the adsorption preparation period at a gas pressure slightly higher than the optimal adsorption pressure in the adsorption tower assembly 5, until the pressure in the adsorption tower 5-1 during the adsorption preparation period reaches the optimal adsorption pressure. At the same time, the impurity gas is discharged through the thirteenth solenoid valve 4-13. During the adsorption process, it is necessary to maintain the dynamic stability of the temperature and pressure in the tower.

[0071] S3, Pressure drop of adsorption tower: When the methane adsorption module 11 in adsorption tower 5-1 during the adsorption preparation period is about to reach the saturated adsorption state, close all solenoid valves and open the fifteenth solenoid valve 4-15 connecting adsorption tower 5-1 during the adsorption preparation period and adsorption tower 5-2 in the regeneration state within adsorption tower assembly 5. At this time, pressure balance is achieved between adsorption tower 5-1 during the adsorption preparation period and adsorption tower 5-2 in the regeneration state. As the gas flows, the pressure in the high-pressure adsorption tower gradually decreases, while the pressure in the low-pressure regeneration tower gradually increases. When the pressure reaches or approaches the equilibrium state, close the fifteenth solenoid valve 4-15.

[0072] S4. Desorption in the adsorption tower by heating and depressurizing: Open the sixth solenoid valve 4-6 and the twelfth solenoid valve 4-12, and start the heating system 8. The hot liquid flows from the heating system 8 through the sixth solenoid valve 4-6 into the cold / hot liquid jacket 9 and the spiral tube heat exchanger 10, and flows out through the twelfth solenoid valve 4-12. When the temperature reaches the optimal desorption temperature, open the third solenoid valve 4-3 and the vacuum pump 6. The methane adsorption module 11 in the adsorption tower 5-1, which was in the adsorption preparation period, begins desorption. During the desorption process, when the methane concentration sensor 14... When the concentration of methane in the enriched gas is detected to be too high, the second solenoid valve 4-2 and the fourth solenoid valve 4-4 can be opened to mix with the exhaust gas to achieve the target methane concentration. The mixed enriched gas enters the buffer tank 12 for buffering, and after passing through the flow meter 13 and the methane concentration sensor 14, it is fed into the regenerator for further processing. At the same time, the methane concentration sensor monitors the concentration of enriched gas in real time and feeds back to the third solenoid valve 4-3 and the fourth solenoid valve 4-4 to control the gas flow rate, so as to adjust the concentration of enriched gas until desorption is completed.

[0073] S5, Pressure Equalization Rise in Adsorption Towers: After desorption is completed in adsorption tower 5-1 during the adsorption preparation period, all solenoid valves are closed, and the fifteenth solenoid valve 4-15, which connects adsorption tower 5-1 during the adsorption preparation period and adsorption tower 5-2 in the regeneration state, is opened. At this time, pressure balance is achieved between adsorption tower 5-1 during the adsorption preparation period and adsorption tower 5-2 in the regeneration state. As the gas flows, the pressure in the high-pressure adsorption tower gradually decreases, while the pressure in the low-pressure regeneration tower gradually increases. When the pressure reaches or is close to the equilibrium state, the fifteenth solenoid valve 4-15 is closed, thus completing one cycle.

[0074] S6. Cyclic operation of adsorption towers: When one adsorption tower component 5 is in the adsorption state, the other adsorption tower component 5 must be in the desorption state. The two adsorption towers alternately repeat the cyclic operation state of S2-S5 during operation to ensure a continuous and stable supply of concentrated gas to the regenerator.

[0075] S7. Preheating of the regenerator bed: When the adsorption tower assembly 5 first desorbs, the flow rate of the enriched gas inlet 23 is adjusted by the flow meter 13 to make the regenerator bed reach the optimal bubbling fluidization state. The concentration of the enriched gas inlet 23 is adjusted to above 70% by the methane concentration sensor 14 and the solenoid valve assembly 4. The enriched gas is controlled to be introduced into the air chamber 22 through the enriched gas inlet 23 and then enters the furnace after being evenly distributed by the distribution plate 20. The starter igniter 25 is turned on to ignite the regenerator bed and preheat it to 700-800℃. The generated high-temperature flue gas flows upward along the regenerator body 15 and is then discharged through the cyclone separator 16, flue 17, electrostatic precipitator 18 and induced draft fan 19.

[0076] S8. Coal gangue and gas fluidized bed regenerative oxidation: After preheating, adjust the concentration of enriched gas to 1-2%, start the screw feeder 26 to continuously feed, and the coal gangue particles enter the furnace body 15 of the regenerative furnace from the coal gangue feeding bin 27 to co-combust with the enriched gas. The regenerative body particles and the unburned coal gangue particles rise under the action of air lift and enter the cyclone separator 16 through the flue gas outlet 29. After being separated from the high temperature flue gas in the cyclone separator 16, they return to the bottom of the regenerative body filling bed through the regenerative body return port 31. The ash and slag produced after combustion are discharged through the ash bin 24. The particulate pollutants in the high temperature flue gas are removed through the flue gas duct by the electrostatic precipitator 18, and then discharged by the induced draft fan 19.

[0077] S9. Waste Heat Recovery and Utilization: After combustion stabilizes, the working fluid is controlled to enter the boiler drum 36 through the first economizer inlet 35 and the boiler drum working fluid inlet 37, and then enters the economizer 33 arranged in the flue 17 through the boiler drum working fluid outlet 38. The steam generated after being heated by the economizer 33 first enters the boiler drum 36 through the saturated steam inlet 41, and then enters the steam superheater 32 located inside the superheating chamber 28 through the saturated steam outlet 42 and the steam superheater inlet 43 for secondary heating. The superheated steam generated after secondary heating enters the steam generator 45 through the steam superheater outlet 44. The electrical energy generated by the steam generator 45 is connected to the waste air collection device 2, compressor 3, vacuum pump 6, refrigeration system 7, and heating system 8 through the electric transmission pipeline 46 to realize waste heat recovery and utilization.

[0078] 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 coal mine exhaust gas synergistic enrichment and fluidized bed regenerative combustion system, comprising an exhaust gas diffuser (1), an exhaust gas collection device (2), a gas enrichment mechanism, a temperature control mechanism, a regenerative combustion mechanism, a tail gas treatment mechanism, and a waste heat recovery and utilization mechanism; characterized in that: The gas enrichment and enhancement mechanism includes a compressor (3), a solenoid valve assembly (4), an adsorption tower assembly (5), a vacuum pump (6), a buffer tank (12), a flow meter (13), exhaust gas (47), and a methane concentration sensor (14). The outlet of the exhaust gas (47) is connected to the exhaust gas collection device (2). One end of the compressor (3) is connected to the exhaust gas collection device (2), and the other end of the compressor (3) is connected to the adsorption tower assembly (5) via the solenoid valve assembly (4). One end of the buffer tank (12) is connected to the adsorption tower assembly (5) via the solenoid valve assembly (4), and the other end of the buffer tank (12) is connected to the methane concentration sensor (14) via the flow meter (13). The temperature control mechanism includes a refrigeration system (7), a heating system (8), a cold / hot liquid jacket (9), a methane adsorption module (11), and a spiral tube heat exchanger (10). The cold / hot liquid jacket (9) is connected to the refrigeration system (7) and the heating system (8) through a solenoid valve assembly (4). The cold / hot liquid jacket (9) is wrapped around the outside of the adsorption tower assembly (5). The inside of the cold / hot liquid jacket (9) is connected to the spiral tube heat exchanger (10) on the inner wall of the adsorption tower assembly (5). The regenerative combustion mechanism includes a regenerative furnace body (15). A distribution plate (20) is fixedly provided at the bottom of the inner cavity of the regenerative furnace body (15). A wind chamber (22) is formed between the distribution plate (20), the regenerative furnace body (15), and the bottom plate (21). A gas enrichment inlet (23) communicating with the wind chamber (22) is provided on the bottom plate (21). An ash bin (24), a starter igniter (25), a coal gangue feed bin (27), and a screw feeder (26) are provided on the side wall of the regenerative furnace body (15). The ash bin (24), the starter igniter (25), and the screw feeder (26) are located above the distribution plate (20). The coal gangue feed bin (27) is connected to the interior of the regenerative furnace body (15) through the screw feeder (26). A superheated chamber (28) is provided at the top of the inner cavity of the regenerative furnace body (15). The gas enrichment inlet (23) is connected to the waste heat recovery and utilization mechanism; The exhaust gas treatment mechanism includes a cyclone separator (16), a flue (17), an electrostatic precipitator (18), and an induced draft fan (19). The solid-gas input end at the top of the cyclone separator (16) is connected to the flue gas outlet (29) of the regenerator furnace body (15) located below the superheated chamber (28). The solid discharge end at the bottom of the cyclone separator (16) is connected to the regenerator body return port (31) of the regenerator furnace body (15) located above the distribution plate (20). One end of the flue (17) is connected to the flue gas discharge port (30) at the top of the cyclone separator (16). The other end of the flue (17) is connected to the induced draft fan (19) after passing through the electrostatic precipitator (18). The waste heat recovery and utilization mechanism includes a boiler drum (36), an economizer (33), and a steam superheater (32). The economizer (33), including a heat exchange structure, is located inside the flue (17), and the steam superheater (32), including a heat exchange structure, is located inside the superheater chamber (28). The boiler drum working fluid inlet (37) and the boiler drum working fluid outlet (38) of the boiler drum (36) are connected. The boiler drum working fluid outlet (38) of the boiler drum (36) is connected to the second economizer inlet (39) of the economizer (33). The economizer (33) is connected to a first economizer inlet (35) on one side. The economizer outlet (40) of the economizer (33) is connected to the saturated steam inlet (41) of the boiler drum (36). The saturated steam outlet (42) of the boiler drum (36) is connected to the steam superheater inlet (43) of the steam superheater (32). The steam superheater outlet (44) of the steam superheater (32) and the steam generator (45) are connected together by an electric transmission pipeline (46). The lower end of the economizer outlet (40) is provided with a preheater inlet (48) and a preheater outlet (49). A preheater (34) is provided through the preheater inlet (48) and the preheater outlet (49). The preheater (34) is connected to a methane concentration sensor (14) and a regenerative combustion mechanism. The solenoid valve assembly (4) includes a first solenoid valve (4-1), a second solenoid valve (4-2), a third solenoid valve (4-3), a fourth solenoid valve (4-4), a fifth solenoid valve (4-5), a sixth solenoid valve (4-6), a seventh solenoid valve (4-7), an eighth solenoid valve (4-8), a ninth solenoid valve (4-9), a tenth solenoid valve (4-10), an eleventh solenoid valve (4-11), a twelfth solenoid valve (4-12), a thirteenth solenoid valve (4-13), a fourteenth solenoid valve (4-14), and a fifteenth solenoid valve (4-15). The compressor (3) is connected to the first solenoid valve (4-1) and the second solenoid valve (4-2). The first solenoid valve (4-1) and the second solenoid valve (4-2) are both connected to the adsorption tower assembly (5). The third solenoid valve (4-3) and the fourth solenoid valve (4-4) are respectively located at the upper ends of the first solenoid valve (4-1) and the second solenoid valve (4-2), and the third solenoid valve (4-3) and the fourth solenoid valve (4-4) are connected. The vacuum pump (6) is connected to the third solenoid valve (4-3) and the fourth solenoid valve (4-4). The third solenoid valve (4-3) is connected to the first solenoid valve (4-1), and the fourth solenoid valve (4-4) is connected to the second solenoid valve (4-2). The refrigeration system (7) has an eleventh solenoid valve (4-11), a ninth solenoid valve (4-9), a seventh solenoid valve (4-7), and a fifth solenoid valve (4-5) connected in parallel from top to bottom at both ends. The eleventh solenoid valve (4-11), the ninth solenoid valve (4-9), the seventh solenoid valve (4-7), and the fifth solenoid valve (4-5) are all connected to the adsorption tower assembly (5). The heating system (8) has a twelfth solenoid valve (4-12), a tenth solenoid valve (4-10), an eighth solenoid valve (4-8), and a sixth solenoid valve (4-6) connected in parallel from top to bottom at both ends. The twelfth solenoid valve (4-12), the tenth solenoid valve (4-10), the eighth solenoid valve (4-8), and the sixth solenoid valve (4-6) are all connected to the adsorption tower assembly (5). The upper end of the adsorption tower assembly (5) is connected in series with a thirteenth solenoid valve (4-13) and a fourteenth solenoid valve (4-14), and a fifteenth solenoid valve (4-15) is connected between the thirteenth solenoid valve (4-13) and the fourteenth solenoid valve (4-14). The adsorption tower assembly (5) includes an adsorption tower (5-1) during adsorption preparation and an adsorption tower (5-2) in the regeneration state. The eleventh solenoid valve (4-11) and the fifth solenoid valve (4-5) are respectively connected to the upper and lower ends of the adsorption tower (5-2) in the regeneration state, and the ninth solenoid valve (4-9) and the seventh solenoid valve (4-7) are respectively connected to the upper and lower ends of the adsorption tower (5-1) during the adsorption preparation period. The twelfth solenoid valve (4-12) and the sixth solenoid valve (4-6) are respectively connected to the upper and lower ends of the adsorption tower (5-1) during the adsorption preparation period, and the tenth solenoid valve (4-10) and the eighth solenoid valve (4-8) are respectively connected to the upper and lower ends of the adsorption tower (5-2) in the regeneration state.

2. The coal mine exhaust gas synergistic enrichment and fluidized bed thermal regenerative combustion system according to claim 1, characterized in that: The distribution plate (20) is densely and evenly distributed with perforated holes, and a conical wind cap is installed on the perforated holes. The side of the conical wind cap is provided with either a small hole or a side slit. The working fluid used in the refrigeration system (7), heating system (8) and boiler drum (36) is deionized water.

3. The coal mine exhaust gas synergistic enrichment and fluidized bed thermal regenerative combustion system according to claim 1, characterized in that: The methane adsorption module (11) is prepared by assembling methane adsorption material with a honeycomb active carrier with ultra-low gas resistance and high separation.

4. The coal mine exhaust gas synergistic enrichment and fluidized bed thermal regenerative combustion system according to claim 1, characterized in that: The spiral tube heat exchanger (10) is composed of any one of stainless steel and alloy materials that are resistant to high temperature, high pressure and corrosion.

5. The coal mine exhaust gas synergistic enrichment and fluidized bed thermal regenerative combustion system according to claim 1, characterized in that: The outlet end of the flue (17) is connected to the electrostatic precipitator (18).

6. A method for synergistic enrichment and fluidized bed combustion of coal mine exhaust gas, applicable to any one of the coal mine exhaust gas synergistic enrichment and fluidized bed combustion systems according to claims 1-5, characterized in that, Includes the following steps: S1. Exhaust gas collection and compression: Exhaust gas (47) is discharged from the mine through the ventilation shaft diffusion tower (1), collected by the zero-resistance rotary exhaust gas collection device (2), and pressurized by the compressor (3) before entering the adsorption tower assembly (5). S2, Adsorption Tower Cooling and Pressurization Adsorption: Open the seventh solenoid valve (4-7) and the ninth solenoid valve (4-9), turn on the refrigeration system (7), and the cold liquid flows from the refrigeration system (7) into the cold / hot liquid jacket (9) and the spiral tube heat exchanger (10) through the seventh solenoid valve (4-7), and flows out through the ninth solenoid valve (4-9). When the methane adsorption module (11) in the adsorption tower (5-1) during the adsorption preparation period cools down to the optimal adsorption temperature, open the first solenoid valve (4-1) and the thirteenth solenoid valve (4-13), and inject the pressurized exhaust gas (47) into the adsorption tower (5-1) during the adsorption preparation period at a gas pressure slightly higher than the optimal adsorption pressure in the adsorption tower assembly (5) until the pressure in the adsorption tower (5-1) during the adsorption preparation period reaches the optimal adsorption pressure. At the same time, the impurity gas is discharged through the thirteenth solenoid valve (4-13). During the adsorption process, it is necessary to maintain the dynamic stability of the temperature and pressure in the tower. S3, Pressure drop of adsorption tower: When the methane adsorption module (11) in the adsorption tower (5-1) during the adsorption preparation period is about to reach the saturated adsorption state, close all solenoid valves and open the fifteenth solenoid valve (4-15) connecting the adsorption tower (5-1) during the adsorption preparation period and the adsorption tower (5-2) in the regeneration state in the adsorption tower assembly (5). At this time, the pressure between the adsorption tower (5-1) during the adsorption preparation period and the adsorption tower (5-2) in the regeneration state is balanced. As the gas flows, the pressure in the high-pressure adsorption tower gradually decreases, while the pressure in the low-pressure regeneration tower gradually increases. When the pressure reaches or is close to the equilibrium state, close the fifteenth solenoid valve (4-15). S4. Desorption by heating and depressurizing the adsorption tower: Open the sixth solenoid valve (4-6) and the twelfth solenoid valve (4-12), and start the heating system (8). The hot liquid flows from the heating system (8) into the cold / hot liquid jacket (9) and the spiral tube heat exchanger (10) through the sixth solenoid valve (4-6), and flows out through the twelfth solenoid valve (4-12). When the temperature reaches the optimal desorption temperature, open the third solenoid valve (4-3) and the vacuum pump (6). The methane adsorption module (11) in the adsorption tower (5-1) during the adsorption preparation period begins desorption. During the desorption process, when the methane concentration is transferred... When the sensor (14) senses that the methane concentration of the enriched gas is too high, it can open the second solenoid valve (4-2) and the fourth solenoid valve (4-4) to mix with the exhaust gas to achieve the target methane concentration. The mixed enriched gas enters the buffer tank (12) for buffering. After passing through the flow meter (13) and the methane concentration sensor (14), it is introduced into the regenerator for further processing. At the same time, the methane concentration sensor monitors the enriched gas concentration in real time and feeds back to the third solenoid valve (4-3) and the fourth solenoid valve (4-4) to control the gas flow rate, so as to adjust the enriched gas concentration until desorption is completed. S5, Pressure Equalization Rise of Adsorption Tower: After desorption is completed in the adsorption tower (5-1) during the adsorption preparation period, all solenoid valves are closed, and the fifteenth solenoid valve (4-15) connecting the adsorption tower (5-1) during the adsorption preparation period and the adsorption tower (5-2) in the regeneration state is opened. At this time, pressure balance is achieved between the adsorption tower (5-1) during the adsorption preparation period and the adsorption tower (5-2) in the regeneration state. As the gas flows, the pressure in the high-pressure adsorption tower gradually decreases, while the pressure in the low-pressure regeneration tower gradually increases. When the pressure reaches equilibrium or is close to equilibrium, the fifteenth solenoid valve (4-15) is closed, thus completing one cycle. S6. Cyclic operation of adsorption towers: When one adsorption tower component (5) is in the adsorption state, the other adsorption tower component (5) must be in the desorption state. The two adsorption towers alternately repeat the cyclic operation state of S2-S5 during operation to ensure a continuous and stable supply of concentrated gas to the regenerator. S7. Preheating of the regenerator bed: When the adsorption tower assembly (5) desorbs for the first time, the flow rate of the enriched gas inlet (23) is adjusted by the flow meter (13) to make the regenerator bed reach the best bubbling fluidization state. The concentration of the enriched gas inlet (23) is adjusted to above 70% by the methane concentration sensor (14) and the solenoid valve assembly (4). The enriched gas is controlled to be introduced into the air chamber (22) through the enriched gas inlet (23) and then enters the furnace after being evenly distributed by the distribution plate (20). The starter igniter (25) is turned on to ignite the regenerator bed and preheat it to 700-800℃. The generated high-temperature flue gas flows upward along the regenerator body (15) and then is discharged through the cyclone separator (16), flue (17), electrostatic precipitator (18) and induced draft fan (19). S8. Coal gangue and gas fluidized regenerative oxidation: After preheating, adjust the concentration of concentrated gas to 1-2%, start the screw feeder (26) to continuously feed, and the coal gangue particles enter the furnace body (15) of the regenerative furnace from the coal gangue feed hopper (27) and are co-combusted with the concentrated gas. The regenerative particles and the unburned coal gangue particles rise under the action of air lift and enter the cyclone separator (16) through the flue gas outlet (29). After being separated from the high temperature flue gas in the cyclone separator (16), they return to the bottom of the regenerative filling bed through the regenerative return port (31). The ash and slag produced after combustion are discharged through the ash hopper (24). The particulate pollutants in the high temperature flue gas are removed through the flue gas duct by the electrostatic precipitator (18) and then discharged by the induced draft fan (19). S9. Waste heat recovery and utilization: After combustion stabilizes, the working fluid is controlled to enter the boiler drum (36) through the first economizer inlet (35) and the boiler drum working fluid inlet (37), and then enter the economizer (33) arranged in the flue (17) through the boiler drum working fluid outlet (38). The steam formed after being heated by the economizer (33) first enters the boiler drum (36) through the saturated steam inlet (41), and then enters the steam superheater (32) located inside the superheating chamber (28) through the saturated steam outlet (42) and the steam superheater inlet (43) for secondary heating. The superheated steam formed after secondary heating enters the steam generator (45) through the steam superheater outlet (44). The electrical energy generated by the steam generator (45) is connected to the waste air collection device (2), compressor (3), vacuum pump (6), refrigeration system (7) and heating system (8) through the electric transmission pipeline (46) to realize waste heat recovery and utilization.

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