Coal mine ventilation air methane synergistic enrichment and fluidized heat storage combustion system and method

Abstract

The invention provides a coal mine ventilation air methane synergistic enrichment and fluidized heat storage combustion system and method. The system comprises an air shaft diffusion tower and a ventilation air methane collecting device, the method comprises the following steps: collection and compression of ventilation air methane, cooling and boosting adsorption of an adsorption tower, pressure drop equalization of the adsorption tower, temperature rise, pressure reduction and desorption of the adsorption tower, pressure rise equalization of the adsorption tower, periodic cycle work of the adsorption tower, preheating of a packed bed of a heat storage furnace, fluidized heat storage oxidation of coal gangue and gas, and waste heat recovery and utilization. According to the invention, safe and efficient enrichment of ventilation air methane can be realized, and fluidized heat storage oxidation coupling utilization of concentrated gas and coal gangue particles can be realized; the oxidation waste heat is used as a generator heat source; the carbon reduction scheme of large-scale separation and concentration-synergistic oxidation-efficient utilization of the oversize coal mine ventilation air methane is formed, the coal industry is assisted to achieve the goal of'two wastes' and sustainable development, and large-flow, low-cost, safe and efficient treatment and utilization of the ventilation air methane discharged by an oversize low-gas mine can be achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of synergistically increasing the efficiency of coal mine ventilation gas enrichment and fluidized heat storage combustion, and in particular to a system and method for synergistically increasing the efficiency of coal mine ventilation gas enrichment and fluidized heat storage combustion. Background Art

[0002] my country's coal mine ventilation gas (methane concentration less than 0.75%) emits more than 25 billion cubic meters per year. 3 Methane is the second largest greenhouse gas after carbon dioxide, and its carbon emissions are huge. However, in the large-scale low-gas mines in Northwest my country, the concentration of ventilation gas in the total return air lane is less than 0.1%. There is no effective low-cost disposal and utilization technology, and the only way is to discharge it into the air. In particular, the total methane emissions caused by ventilation gas discharge from a coal mine with an annual output of 10 million tons exceeded 17 million cubic meters. 3 In particular, ventilation gas in underground coal mines also contains relatively high concentrations of water vapor and powder / coal dust, which makes gas utilization difficult under high humidity and high dust conditions.

[0003] In my country's ultra-large, low-gas mines, the lack of high-concentration extracted gas sources makes cascaded thermal storage and oxidation of high and low concentrations unfeasible. The exhaust gas must be concentrated before it can be utilized. The challenges in this field are how to develop a highly selective and stable methane absorption / adsorption material, clarify the adsorption and separation mechanism of exhaust gas under high humidity and high dust conditions, and achieve temperature-pressure coordinated adsorption separation, then couple the concentrated gas (1%-2%) with the fluidized thermal storage and oxidation of coal gangue particles to achieve "waste-to-waste" treatment. Summary of the Invention

[0004] The purpose of the present invention is to solve the shortcomings of the existing technology and propose a coal mine ventilation gas synergistic efficiency enrichment and fluidized heat storage combustion system and method.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] Coal mine exhaust gas synergistic efficiency enrichment and fluidized heat storage combustion system, including air shaft diffusion tower, exhaust gas collection device, gas efficiency enrichment mechanism, temperature control mechanism, heat storage combustion mechanism, tail gas treatment mechanism and waste heat recovery and utilization mechanism;

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

[0008] The temperature control mechanism includes a refrigeration system, a heating system, a cold / hot liquid jacket and a spiral tube heat exchanger. The outside of the cold / hot liquid jacket is connected to the refrigeration system and the heating system through an electromagnetic 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, a wind chamber is formed between the distribution plate, the regenerative furnace body and the bottom plate, a concentrated gas inlet communicating with the wind chamber is provided on the bottom plate, an ash bin, a starting igniter and a screw feeder are provided on the side wall of the regenerative furnace body, the ash bin, the starting igniter and the screw feeder are arranged above the distribution plate, the coal gangue feeding bin is communicated with the interior of the regenerative furnace body through the screw feeder, and an overheating chamber is provided at the top of the inner cavity of the regenerative furnace body;

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

[0011] Preferably, the tail gas treatment mechanism includes a cyclone separation device, a flue, an electrostatic precipitator and an induced draft fan, the solid gas input end at the top of the cyclone separation device is connected to the flue gas outlet located below the superheating chamber of the regenerative furnace body, the solid discharge end at the bottom of the cyclone separation device is connected to the regenerative body return port located above the distribution plate of the regenerative furnace body, one end of the flue is connected to the flue gas discharge port at the top of the cyclone separation device, 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 mechanism includes a boiler drum, an economizer and a steam superheater. The economizer including a heat exchange structure is arranged inside the flue, and the steam superheater including a heat exchange structure is arranged inside the superheating chamber. The boiler working medium inlet of the boiler drum is connected to the boiler working medium outlet, and the boiler working medium outlet of the boiler drum is connected to the economizer inlet of the economizer. The economizer outlet of the economizer is connected to the saturated steam inlet of the boiler drum, and the saturated steam outlet of the boiler drum is connected to the steam superheater inlet of the steam superheater. The steam superheater outlet of the steam superheater and the steam generator are connected to a power transmission pipeline.

[0013] A preheater inlet and a preheater outlet are provided at the lower end of the economizer outlet. A preheater is provided through both the preheater inlet and the preheater outlet. The preheater is connected to a methane concentration sensor, and the preheater is connected to a heat storage combustion mechanism.

[0014] Preferably, the distribution plate is densely and evenly provided with hollow holes, a conical hood is installed on the hollow holes, and the side of the conical hood is provided with any one of small holes and side seams;

[0015] The working fluids used in the refrigeration system, heating system and boiler drum are all deionized water.

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

[0017] Preferably, the spiral tube heat exchanger is made 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 second 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, the first solenoid valve and the second solenoid valve are both connected to the adsorption tower assembly, the third solenoid valve and the fourth solenoid valve are respectively arranged at the upper ends of the first solenoid valve and the second solenoid valve, and the third solenoid valve is connected to the fourth solenoid valve, 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 two ends of the refrigeration system are connected in parallel with an eleventh solenoid valve, a ninth solenoid valve, a seventh solenoid valve and a fifth solenoid valve from top to bottom, and 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 two ends of the heating system are connected in parallel with a twelfth solenoid valve, a tenth solenoid valve, an eighth solenoid valve and a sixth solenoid valve from top to bottom, and 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] A thirteenth solenoid valve and a fourteenth solenoid valve are connected in series at the upper end of the adsorption tower assembly, and a fifteenth solenoid valve is commonly connected between the thirteenth solenoid valve and the fourteenth solenoid valve.

[0023] Preferably, the adsorption tower assembly includes an adsorption tower in an adsorption preparation period 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 in the adsorption preparation period;

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

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

[0027] The present invention also proposes a method for synergistically increasing the efficiency of coal mine exhaust gas enrichment and fluidized heat storage combustion, which is applicable to the above-mentioned coal mine exhaust gas synergistically increasing the efficiency of enrichment and fluidized heat storage combustion system, and includes the following steps:

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

[0029] S2, adsorption tower cooling and pressure increase adsorption: open the seventh solenoid valve and the ninth solenoid valve, turn on the refrigeration system, the cold liquid flows from the refrigeration system into the cold / hot liquid jacket and the spiral tube heat exchanger through the seventh solenoid valve, and flows out from the ninth solenoid valve. When the methane adsorption module in the adsorption tower during the adsorption preparation period is cooled to the optimal adsorption temperature, open the first solenoid valve and the thirteenth, and 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 assembly, 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. The temperature and pressure in the tower need to be maintained dynamically stable during the adsorption process;

[0030] S3, average pressure drop of adsorption towers: When the methane adsorption module in the adsorption tower during the adsorption preparation period is about to reach a saturated adsorption state, all solenoid valves are closed, and the fifteenth solenoid valve connecting the adsorption tower during the adsorption preparation period and the adsorption tower in the regeneration state in the adsorption tower assembly is opened. At this time, the pressure between the adsorption tower during the adsorption preparation period in the regeneration state and the adsorption tower 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 equilibrium or is close to equilibrium, the fifteenth solenoid valve is closed;

[0031] S4, adsorption tower temperature increase and pressure reduction for desorption: open the sixth solenoid valve and the twelfth, start the heating system, the hot liquid flows from the heating system through the sixth solenoid valve into the cold / hot liquid jacket and the spiral tube heat exchanger, and flows out from the twelfth solenoid valve. When the temperature is raised to the optimal desorption temperature, open the third solenoid valve and the vacuum pump, and the methane adsorption module in the adsorption tower during the adsorption preparation period begins to desorb. During the desorption process, when the methane concentration sensor senses that the methane concentration of the concentrated gas is too high, the second solenoid valve and the fourth can be opened to mix with the exhaust gas to reach the target methane concentration. The mixed concentrated gas enters the buffer tank for buffering, and after passing through the flow meter and the methane concentration sensor, it is introduced into the heat storage furnace for the next step of processing. At the same time, the methane concentration sensor monitors the concentrated gas concentration in real time and feeds back to the third solenoid valve and the fourth to control the gas flow to achieve the purpose of adjusting the concentrated gas concentration until desorption is completed;

[0032] S5, adsorption tower pressure rise: after the desorption of the adsorption tower during the adsorption preparation period is completed, all solenoid valves are closed, and the fifteenth solenoid valve connecting the adsorption tower during the adsorption preparation period and the adsorption tower in the regeneration state is opened. At this time, the pressure between the adsorption tower during the adsorption preparation period and the adsorption tower 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 equilibrium or close to equilibrium, the fifteenth solenoid valve is closed, and one cycle is completed.

[0033] S6. Cyclic operation of the adsorption tower: When one adsorption tower component is in the adsorption state, the other adsorption tower component must be in the desorption state. The two adsorption towers alternately repeat the cyclic working states of S2-S5 during operation to ensure a continuous and stable supply of concentrated gas to the regenerative furnace;

[0034] S7. Preheating the regenerator bed: When the adsorption tower assembly is first desorbed, the flow rate at the concentrated gas inlet is adjusted using a flow meter to achieve an optimal bubbling and fluidizing state for the regenerator bed. The methane concentration sensor and solenoid valve assembly are used to adjust the concentration of the concentrated gas inlet to above 70%. The concentrated gas is controlled to be introduced into the wind chamber through the concentrated gas inlet and then enter the furnace after being evenly distributed through the distribution plate. The starting igniter is turned on for ignition, preheating the regenerator bed to 700-800°C. 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. Fluidized heat storage oxidation of gangue and gas: After preheating is completed, the concentration of concentrated gas is adjusted to 1-2%, and the screw feeder is started for continuous feeding. The gangue particles enter the furnace of the regenerative furnace from the gangue feeding bin and burn together with the concentrated gas. The regenerative body particles and the unburned gangue particles go up through the flue gas outlet and enter the cyclone separation device under the action of gas lift. After being separated from the high-temperature flue gas in the cyclone separation device, they return to the bottom of the regenerative body packed bed through the regenerative body return port. The ash produced after combustion is discharged through the ash bin. The particulate pollutants in the high-temperature flue gas are removed through the flue and the electrostatic precipitator, and then discharged through the induced draft fan.

[0036] S9. Waste heat recovery and utilization: After the combustion is stable, the working medium is controlled to enter the boiler drum through the economizer inlet and the boiler drum working medium inlet, and then enter the economizer arranged in the flue through the boiler drum working medium outlet. The steam formed after heating by the economizer first enters the boiler drum through the saturated steam inlet, and then enters the steam superheater located inside the superheating chamber through the saturated steam outlet and the steam superheater inlet for secondary heating. The superheated steam formed after the secondary heating enters the steam generator through the steam superheater outlet. The electricity generated by the steam generator is connected to the exhaust air collection device, compressor, vacuum pump, refrigeration system, and heating system through the power transmission pipeline to realize waste heat recovery and utilization.

[0037] The beneficial effects of the present invention are:

[0038] 1. In response to the current ultra-large low-gas mines, this application proposes a new solution for the low-carbon utilization of ventilation gas in underground coal mines, namely, enriching and reusing ventilation gas to form a safe and low-energy enrichment method, and coupling it with the fluidized thermal storage oxidation of coal gangue particles to achieve fluidized thermal storage oxidation and ultra-high efficiency utilization of "two wastes", thus solving the problem of low ventilation gas utilization rate; through the temperature and pressure variable synergistic efficiency enrichment technology, ventilation gas is safely and efficiently enriched, and concentrated gas (1%-2%) is coupled with the fluidized thermal storage oxidation of coal gangue particles, and the waste heat of oxidation is used as the heat source of the generator, realizing "waste treatment with waste";

[0039] 2. The zero-resistance rotating exhaust air collection device is used to achieve zero resistance to mine exhaust, effectively improving the collection efficiency of low-concentration gas (exhaust air gas) in the coal mine outlet diffusion tower, reducing the direct emission of this part of greenhouse gas, and achieving effective resource recovery;

[0040] 3. The synergistic enrichment technology of temperature and pressure swings improves the adsorption capacity of methane adsorbents, solving the problems of high energy consumption and low yield in traditional single pressure swing adsorption separation and enrichment of low-concentration gas. It effectively improves the enrichment efficiency of exhaust gas in large underground coal mines, making it easier to reach a concentration range that can be efficiently burned. It has the characteristics of high yield, high purity, low energy consumption, safety and stability.

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

[0042] 5. The efficiently enriched gas reduces the amount of greenhouse gases emitted directly into the atmosphere, especially methane emissions, which has positive significance for alleviating global warming. The effective utilization of coal gangue reduces land occupation and environmental pollution, and promotes ecological restoration and environmentally friendly development in coal mining areas. It forms a carbon reduction plan of "large-scale separation and concentration-synergistic oxidation-efficient utilization" for exhaust gas in super-large coal mines, helping the coal industry achieve the "two wastes" goals and sustainable development. It is particularly suitable for the large-scale, low-cost, safe and efficient disposal and utilization of exhaust gas emitted from super-large low-gas mines. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 This is a connection structure diagram of the coal mine ventilation gas synergistic enrichment and fluidized heat storage combustion system proposed by the present invention;

[0044] In the figure: 1 air 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 Temperature sensor, 15 regenerative furnace body, 16 cyclone separator, 17 flue, 18 electrostatic precipitator, 19 induced draft fan, 20 distribution plate, 21 bottom plate, 22 air chamber, 23 concentrated gas inlet, 24 ash bin, 25 starting igniter, 26 screw feeder, 27 coal gangue feeding bin, 28 superheater, 29 flue gas outlet, 30 flue gas discharge outlet, 31 regenerative body return port, 32 steam superheater, 33 economizer, 34 preheater, 35 economizer inlet, 36 boiler drum, 37 boiler drum working medium inlet, 38 boiler drum working medium outlet, 39 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 power transmission pipeline, 47 exhaust air gas, 48 ​​preheater inlet, 49 preheater outlet. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0046] Reference Figure 1 , a coal mine exhaust gas synergistic efficiency enrichment and fluidized heat storage combustion system, including an air shaft diffusion tower 1, an exhaust gas collection device 2, a gas efficiency enrichment mechanism, a temperature control mechanism, a heat storage combustion mechanism, an exhaust gas treatment mechanism and a waste heat recovery and utilization mechanism;

[0047] The gas efficiency enhancement and enrichment mechanism includes a compressor 3, an electromagnetic 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. The exhaust gas collection device 2 is a zero-resistance exhaust gas collection device that can achieve zero resistance impact on mine exhaust and capture low-concentration exhaust gas from the source with high efficiency and low energy consumption; 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 through the electromagnetic valve assembly 4. One end of the buffer tank 12 is connected to the adsorption tower assembly 5 through the electromagnetic valve assembly 4, and the other end of the buffer tank 12 is connected to the methane concentration sensor 14 through 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 outside of the cold / hot liquid jacket 9 is connected to the refrigeration system 7 and the heating system 8 through the solenoid valve assembly 4. The cold / hot liquid jacket 9 is wrapped around the outside of the main body of the adsorption tower assembly 5, and 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 the present 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, and a concentrated gas inlet 23 is provided on the bottom plate 21 and is connected to the wind chamber 22. An ash bin 24, a starting igniter 25 and a screw feeder 26 are provided on the side wall of the regenerative furnace body 15. The ash bin 24, the starting 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. An overheating chamber 28 is provided at the top of the inner cavity of the regenerative furnace body 15.

[0050] The concentrated gas inlet 23 is connected to the waste heat recovery mechanism.

[0051] In the present invention, the tail gas treatment mechanism includes a cyclone separation device 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 separation device 16 is connected to the flue gas outlet 29 located below the superheating chamber 28 of the regenerative furnace body 15. The solid discharge end at the bottom of the cyclone separation device 16 is connected to the regenerative body return port 31 located above the distribution plate 20 of the regenerative furnace body 15. One end of the flue 17 is connected to the flue gas discharge port 30 at the top of the cyclone separation device 16. 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 mechanism includes a boiler drum 36, an economizer 33, and a steam superheater 32. The economizer 33 including a heat exchange structure is arranged inside the flue 17, and the steam superheater 32 including a heat exchange structure is arranged inside the superheating chamber 28. The boiler drum working medium inlet 37 of the boiler drum 36 is connected to the boiler drum working medium outlet 38, and the boiler drum working medium outlet 38 of the boiler drum 36 is connected to the economizer inlet 39 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, and 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 to an electricity transmission pipeline 46.

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

[0054] In the present invention, the distribution plate 20 is densely provided with uniformly distributed hollow holes, a conical hood is installed on the hollow holes, and the side of the conical hood is provided with any one of small holes and side seams;

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

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

[0057] The methane adsorption module 11 is a new material Mzn-ZIFs for adsorbing ventilation gas.

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

[0059] In the present 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 second 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, and 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 arranged 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 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 connected in parallel at both ends of the refrigeration system 7 from top to bottom. 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 two ends of the heating system 8 are connected in parallel from top to bottom with 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. 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 commonly connected between the thirteenth solenoid valve 4-13 and the fourteenth solenoid valve 4-14.

[0064] In the present invention, the adsorption tower assembly 5 includes an adsorption tower 5-1 in the adsorption preparation period 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 in 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 in the regeneration state.

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

[0068] The present invention also proposes a method for synergistically enhancing the enrichment of coal mine exhaust gas and fluidized heat storage combustion, which is applicable to the above-mentioned coal mine exhaust gas synergistically enhancing the enrichment of coal mine exhaust gas and fluidized heat storage combustion system, and is characterized in that it includes the following steps:

[0069] S1. Collection and compression of exhaust gas: exhaust gas 47 is discharged from the mine through the air 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. Cooling and pressurizing the adsorption tower: 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 through the seventh solenoid valve 4-7 into the cold / hot liquid jacket 9 and the spiral tube heat exchanger 10, and flows out from the ninth solenoid valve 4-9. After the methane adsorption module 11 in the adsorption tower 5-1 during the adsorption preparation period is cooled 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 dynamic stability of the temperature and pressure in the tower.

[0071] S3, average pressure drop of adsorption towers: When the methane adsorption module 11 in the adsorption tower 5-1 during the adsorption preparation period is about to reach a saturated adsorption state, 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 in the adsorption tower assembly 5 is opened. At this time, pressure balance is performed 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;

[0072] S4, adsorption tower temperature increase and pressure reduction desorption: open the sixth solenoid valve 4-6 and the twelfth 4-12, 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 from the twelfth solenoid valve 4-12. When the temperature is increased to the optimal desorption temperature, open the third solenoid valve 4-3 and the vacuum pump 6, and the methane adsorption module 11 in the adsorption tower 5-1 during the adsorption preparation period begins to desorb. During the desorption process, when the methane concentration sensor 14 senses When the methane concentration of the concentrated gas is too high, the second solenoid valve 4-2 and the fourth solenoid valve 4-4 can be opened to mix it with the exhaust gas to reach the target methane concentration. The mixed concentrated gas enters the buffer tank 12 for buffering, and after passing through the flow meter 13 and the methane concentration sensor 14, it is passed into the heat storage furnace for the next step of processing. At the same time, the methane concentration sensor monitors the concentrated 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 achieve the purpose of adjusting the concentrated gas concentration until desorption is completed;

[0073] S5, adsorption tower pressure rise: after the desorption of the adsorption tower 5-1 during the adsorption preparation period is completed, 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, 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 equilibrium or is close to equilibrium, the fifteenth solenoid valve 4-15 is closed, and one cycle is completed.

[0074] S6, adsorption tower cyclic operation: when one adsorption tower assembly 5 is in the adsorption state, the other adsorption tower assembly 5 must be in the desorption state, and the two adsorption towers alternately repeat the cyclic working states of S2-S5 during operation to ensure a continuous and stable supply of concentrated gas to the regenerative furnace;

[0075] S7. Preheating the regenerator bed: When the adsorption tower assembly 5 is first desorbed, the flow rate of the concentrated gas inlet 23 is adjusted by the flow meter 13 to achieve an optimal bubbling fluidized state in the regenerator bed. The methane concentration sensor 14 and the solenoid valve assembly 4 are used to adjust the concentration of the concentrated gas inlet 23 to above 70%. The concentrated gas is controlled to be introduced into the wind chamber 22 through the concentrated gas inlet 23 and then enter the furnace after being uniformly distributed through the distribution plate 20. The igniter 25 is turned on for ignition, preheating the regenerator bed to 700-800°C. The generated high-temperature flue gas flows upward along the regenerator body 15 and is then discharged through the cyclone separator 16, the flue 17, the electrostatic precipitator 18, and the induced draft fan 19.

[0076] S8. Fluidized heat storage oxidation of gangue and gas: After preheating is completed, the concentration of the concentrated gas is adjusted to 1-2%, and the screw feeder 26 is started to feed continuously. The gangue particles enter the furnace body 15 of the regenerative furnace from the gangue feeding bin 27 and burn together with the concentrated gas. The regenerative body particles and the unburned gangue particles ascend through the flue gas outlet 29 and enter the cyclone separation device 16 under the action of gas lift. After being separated from the high-temperature flue gas in the cyclone separation device 16, they return to the bottom of the regenerative body packed bed through the regenerative body return port 31. The ash produced after combustion is discharged through the ash bin 24. The particulate pollutants in the high-temperature flue gas are removed through the flue and the electrostatic precipitator 18, and then discharged through the induced draft fan 19.

[0077] S9. Waste heat recovery and utilization: After the combustion is stabilized, the working medium is controlled to enter the boiler drum 36 through the economizer inlet 35 and the boiler drum working medium inlet 37, and then enters the economizer 33 arranged in the flue 17 through the boiler drum working medium 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 the secondary heating enters the steam generator 45 through the steam superheater outlet 44. The electric energy generated by the steam generator 45 is connected to the exhaust air collection device 2, the compressor 3, the vacuum pump 6, the refrigeration system 7, and the heating system 8 through the electric transmission pipeline 46 to realize waste heat recovery and utilization.

[0078] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A coal mine exhaust gas synergistic efficiency enhancement and enrichment and fluidized heat storage combustion system, comprising an air shaft diffusion tower (1), an exhaust gas collection device (2), a gas efficiency enhancement and enrichment mechanism, a temperature control mechanism, a heat storage combustion mechanism, an exhaust gas treatment mechanism, and a waste heat recovery and utilization mechanism; characterized in that: The gas efficiency-enriching mechanism comprises 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); one end of the compressor (3) is connected to the exhaust gas collection device (2); the other end of the compressor (3) is connected to the adsorption tower assembly (5) through the solenoid valve assembly (4); one end of the buffer tank (12) is connected to the adsorption tower assembly (5) through the solenoid valve assembly (4); and the other end of the buffer tank (12) is connected to the methane concentration sensor (14) through the flow meter (13); The temperature control mechanism comprises a refrigeration system (7), a heating system (8), a cold / hot liquid jacket (9) and a spiral tube heat exchanger (10); the outside of the cold / hot liquid jacket (9) is communicated with the refrigeration system (7) and the heating system (8) via a solenoid valve assembly (4); the cold / hot liquid jacket (9) is wrapped around the outside of the adsorption tower assembly (5); and the inside of the cold / hot liquid jacket (9) is communicated with the spiral tube heat exchanger (10) on the inner wall of the adsorption tower assembly (5).

2. The coal mine ventilation gas synergistic enrichment and fluidized heat storage combustion system according to claim 1 is characterized by: The heat storage combustion mechanism includes a heat storage furnace body (15), a distribution plate (20) is fixedly provided at the bottom of the inner cavity of the heat storage furnace body (15), a wind chamber (22) is formed between the distribution plate (20), the heat storage furnace body (15) and the bottom plate (21), a concentrated gas inlet (23) communicating with the wind chamber (22) is provided on the bottom plate (21), an ash bin (24), a starting igniter (25) and a screw feeder (26) are provided on the side wall of the heat storage furnace body (15), the ash bin (24), the starting igniter (25) and the screw feeder (26) are arranged above the distribution plate (20), the coal gangue feeding bin (27) is communicated with the inside of the heat storage furnace body (15) through the screw feeder (26), and an overheating chamber (28) is provided at the top of the inner cavity of the heat storage furnace body (15); The concentrated gas inlet (23) is connected to the waste heat recovery mechanism.

3. The coal mine ventilation gas synergistic enrichment and fluidized heat storage combustion system according to claim 1 is characterized by: The tail gas treatment mechanism includes a cyclone separation device (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 separation device (16) is communicated with the flue gas outlet (29) located below the superheating chamber (28) of the regenerative furnace body (15); the solid discharge end at the bottom of the cyclone separation device (16) is communicated with the regenerative body return port (31) located above the distribution plate (20) of the regenerative furnace body (15); one end of the flue (17) is communicated with the flue gas discharge port (30) at the top of the cyclone separation device (16); and the other end of the flue (17) is communicated with the induced draft fan (19) after passing through the electrostatic precipitator (18); The waste heat recovery mechanism includes a boiler drum (36), an economizer (33) and a steam superheater (32). The economizer (33) including a heat exchange structure is arranged inside the flue (17), and the steam superheater (32) including a heat exchange structure is arranged inside the superheating chamber (28). The boiler drum working medium inlet (37) of the boiler drum (36) is communicated with the boiler drum working medium outlet (38), and the boiler drum working medium outlet (38) of the boiler drum (36) is communicated with the economizer inlet (39) of the economizer (33). The economizer outlet (40) of the economizer (33) is communicated with the saturated steam inlet (41) of the boiler drum (36), and the saturated steam outlet (42) of the boiler drum (36) is communicated with 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 to an electric transmission pipeline (46). A preheater inlet (48) and a preheater outlet (49) are provided at the lower end of the economizer outlet (40), and a preheater (34) is provided through both the preheater inlet (48) and the preheater outlet (49). The preheater (34) is connected to a methane concentration sensor (14), and the preheater (34) is connected to a heat storage combustion mechanism.

4. The coal mine ventilation gas synergistic enrichment and fluidized heat storage combustion system according to claim 1 is characterized by: The distribution plate (20) is densely and evenly provided with hollow holes, a conical hood is installed on the hollow holes, and the side of the conical hood is provided with any one of small holes and side seams; The working fluids used in the refrigeration system (7), the heating system (8) and the boiler drum (36) are all deionized water.

5. The coal mine ventilation gas synergistic enrichment and fluidized heat storage combustion system according to claim 1 is characterized by: The methane adsorption module (11) is prepared by assembling a methane adsorption material and a honeycomb active carrier with ultra-low gas resistance and high separation properties.

6. The coal mine ventilation gas synergistic enrichment and fluidized heat storage combustion system according to claim 1 is characterized by: The spiral tube heat exchanger (10) is made of any one of stainless steel and alloy materials that are resistant to high temperature, high pressure and corrosion.

7. The coal mine ventilation gas synergistic enrichment and fluidized heat storage combustion system according to claim 1 is characterized by: The solenoid valve assembly (4) comprises 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 second 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 arranged 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 two ends of the refrigeration system (7) are connected in parallel from top to bottom with 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), and 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 two ends of the heating system (8) are connected in parallel from top to bottom with 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), and 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); A thirteenth solenoid valve (4-13) and a fourteenth solenoid valve (4-14) are connected in series at the upper end of the adsorption tower assembly (5), and a fifteenth solenoid valve (4-15) is commonly connected between the thirteenth solenoid valve (4-13) and the fourteenth solenoid valve (4-14).

8. The coal mine ventilation gas synergistic enrichment and fluidized heat storage combustion system according to claim 7 is characterized by: The adsorption tower assembly (5) includes an adsorption tower (5-1) in an adsorption preparation period and an adsorption tower (5-2) in a 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) in 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.

9. The coal mine ventilation gas synergistic enrichment and fluidized heat storage combustion system according to claim 1 is characterized by: The outlet end of the flue (17) is connected to an electrostatic precipitator (18).

10. A method for synergistically enhancing the enrichment and fluidized heat storage combustion of coal mine exhaust gas, applicable to the synergistically enhancing the enrichment and fluidized heat storage combustion system of any one of claims 1 to 9, characterized in that: The following steps are involved: S1. Collection and compression of exhaust gas: exhaust gas (47) is discharged from the mine through the air 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 pressure-raising 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) through the seventh solenoid valve (4-7) into the cold / hot liquid jacket (9) and the spiral tube heat exchanger (10), and flows out from the ninth solenoid valve (4-9). When the methane adsorption module (11) in the adsorption tower (5-1) during the adsorption preparation period is cooled to the optimum 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 optimum adsorption pressure in the adsorption tower assembly (5) until the pressure in the adsorption tower (5-1) during the adsorption preparation period reaches the optimum 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 temperature and pressure in the tower dynamically stable. S3, adsorption tower average pressure drop: when the methane adsorption module (11) in the adsorption tower (5-1) during the adsorption preparation period is about to reach a saturated adsorption state, all electromagnetic valves are closed, and the fifteenth electromagnetic 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) is opened. At this time, pressure balance is performed between the adsorption tower (5-1) during the adsorption preparation period in the regeneration state 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 a balance or is close to a balance state, the fifteenth electromagnetic valve (4-15) is closed; S4, adsorption tower temperature increase and pressure reduction desorption: open the sixth solenoid valve (4-6) and the twelfth (4-12), 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 from the twelfth solenoid valve (4-12). When the temperature is increased to the optimal desorption temperature, open the third solenoid valve (4-3) and the vacuum pump (6), and the methane adsorption module (11) in the adsorption tower (5-1) during the adsorption preparation period begins to desorb. During the desorption process, when the methane concentration sensor When the sensor (14) senses that the methane concentration of the concentrated gas is 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 concentrated gas enters the buffer tank (12) for buffering, and after passing through the flow meter (13) and the methane concentration sensor (14), it is passed into the heat storage furnace for the next step of 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 solenoid valve (4-3) and the fourth solenoid valve (4-4) to control the gas flow rate, so as to achieve the purpose of adjusting the concentration of the concentrated gas until desorption is completed; S5, adsorption tower pressure rise: after the desorption of the adsorption tower (5-1) during the adsorption preparation period is completed, all electromagnetic valves are closed, and the fifteenth electromagnetic 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 performed 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 electromagnetic valve (4-15) is closed, and one cycle is completed. S6, the adsorption tower cycle cycle work: when one adsorption tower component (5) is in the adsorption state, the other adsorption tower component (5) must be in the desorption state, and the two adsorption towers alternately repeat the cycle cycle working state of S2-S5 during operation to ensure continuous and stable supply of concentrated gas to the regenerative furnace; S7, preheating the heat storage furnace packed bed: when the adsorption tower assembly (5) is first desorbed, the flow rate of the concentrated gas inlet (23) is adjusted by the flow meter (13) so that the heat storage furnace bed layer reaches the optimal bubbling fluidization state, and the concentration of the concentrated gas inlet (23) is adjusted to more than 70% by the methane concentration sensor (14) and the solenoid valve assembly (4). The concentrated gas is controlled to be introduced into the wind chamber (22) through the concentrated gas inlet (23) and then enters the furnace after being uniformly distributed through the distribution plate (20). The starting igniter (25) is turned on for ignition, and the heat storage body packed bed is preheated to 700-800°C. The generated high-temperature flue gas flows upward along the heat storage furnace body (15) and is then discharged through the cyclone separation device (16), the flue (17), the electrostatic precipitator (18) and the induced draft fan (19); S8. Fluidized heat storage oxidation of gangue and gas: After preheating is completed, the concentration of the concentrated gas is adjusted to 1-2%, and the screw feeder (26) is started to feed continuously. The gangue particles enter the furnace of the regenerative furnace (15) from the gangue feeding bin (27) and burn together with the concentrated gas. The regenerative body particles and the unburned gangue particles ascend through the flue gas outlet (29) under the action of gas lift and enter the cyclone separation device (16). After being separated from the high-temperature flue gas in the cyclone separation device (16), they return to the bottom of the regenerative body packed bed through the regenerative body return port (31). The ash generated after combustion is discharged through the ash bin (24). The particulate pollutants in the high-temperature flue gas are removed through the flue and the electrostatic precipitator (18), and then discharged through the induced draft fan (19). S9. Waste heat recovery and utilization: After combustion becomes stable, the working medium is controlled to enter the boiler drum (36) through the economizer inlet (35) and the boiler drum working medium inlet (37), and then enter the economizer (33) arranged in the flue (17) through the boiler drum working medium 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 formed after the secondary heating enters the steam generator (45) through the steam superheater outlet (44). The electric energy generated by the steam generator (45) is connected to the exhaust air collection device (2), the compressor (3), the vacuum pump (6), the refrigeration system (7), and the heating system (8) through the electric transmission pipeline (46), thereby realizing waste heat recovery and utilization.

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