Coal mine ventilation air recirculation into mine concentration system and ventilation air treatment process using the same

Abstract

The application relates to a coal mine ventilation air methane (VAM) recycling into mine concentration system and a VAM treatment process using the same. The coal mine VAM recycling into mine concentration system comprises an air inlet pipeline, an air outlet pipeline, a desorption pipeline, two or more adsorption devices and a regeneration fan. The air inlet pipeline is connected with a first air port of each adsorption device and is suitable for introducing the VAM to be treated into the adsorption device. An adsorption purifying agent is arranged in the adsorption device. A second air port of each adsorption device is connected with the air outlet pipeline, and the other end of the air outlet pipeline is suitable for being connected with an air inlet port of an air inlet shaft. The desorption pipeline is connected with the second air port of each adsorption device. The first air port of each adsorption device is connected with a waste gas treatment device. A first valve is arranged at the first air port of each adsorption device and located on the air inlet pipeline. A second valve is arranged at the second air port of each adsorption device and located on the air outlet pipeline. A third valve is further arranged at the second air port and located on the desorption pipeline.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of coal mine ventilation air methane purification, and particularly relates to a coal mine ventilation air methane recycling into mine concentration system and a ventilation air methane treatment process using the same. BACKGROUND

[0002] Ventilation air methane refers to exhaust gas containing a small amount of methane discharged by a mine ventilation system, and most of its components are air. The coal mine safety regulations stipulate that the methane content of ventilation air methane should not exceed 0.75%. In the process of coal mine production, a large amount of ventilation is needed to remove gas, harmful gas and dust, and to provide a fresh air environment for miners. In this process, the equipment inside the mine and the self-heating of the ore will cause the temperature of the air to rise, and these exhaust gases containing heat are discharged through the air shaft to form ventilation air methane. The safety management of coal mines in China is relatively strict, and the ventilation air methane content of almost all coal mines is extremely low, usually to ensure "absolute safety", so the ventilation air methane content is usually controlled at about 0.1%, and some are even much lower than 0.1%. This is because the increase in the volume flow of ventilation air methane due to factors such as the requirement of air flow velocity in the roadway and the increase in ventilation volume ultimately leads to a large total amount of methane and a very low concentration.

[0003] On the other hand, methane is the second largest greenhouse gas in the world, and although its total amount is small, its greenhouse gas effect is 28 times that of carbon dioxide. It is the second largest greenhouse gas that causes global climate change. Usually, due to the extremely thin methane contained therein, its oxidation cannot maintain the self-heating balance, and the existing technology has greatly utilized the method of heat storage for destruction, but due to the above reasons, a large amount of extracted gas must be mixed to increase the methane concentration to be partially destroyed, and without a large amount of extracted gas, it is impossible to completely destroy, thus resulting in large energy consumption and investment. SUMMARY

[0004] Therefore, the present application provides a coal mine ventilation air methane recycling into mine concentration system, which is suitable for increasing the concentration of methane in ventilation air methane.

[0005] According to an aspect of the present application, a coal mine ventilation air methane recycling into mine concentration system is provided, characterized in that it comprises: an air inlet pipeline, an air outlet pipeline, a desorption pipeline, two or more adsorption devices and a regeneration fan.

[0006] One end of the air inlet pipeline is suitable for connecting to the air outlet of the air return shaft; the air inlet pipeline is connected to the first air port of each adsorption device, and is suitable for introducing the ventilation air methane to be treated into the adsorption device; the adsorption device is provided with an adsorption purifying agent, and is suitable for purifying and adsorbing the ventilation air methane to be treated released by the air return shaft; the second air port of each adsorption device is connected to the air outlet pipeline, and the other end of the air outlet pipeline is suitable for being connected to the air inlet of the air inlet shaft.

[0007] The desorption pipeline is connected with the second air outlet of each adsorption device, and is suitable for introducing hot air into the adsorption device to desorb the adsorption purifying agent in the adsorption device. The first air outlet of each adsorption device is also connected with the waste gas treatment equipment, and is suitable for introducing the desorbed gas into the waste gas treatment equipment.

[0008] The coal mine main fan is arranged on the air inlet pipeline, and the blowing side of the coal mine main fan faces the adsorption device. The exhaust air circulation fan is arranged on the air outlet pipeline, and the suction side of the exhaust air circulation fan faces the adsorption device. The regeneration fan is arranged on the desorption pipeline, and the blowing side of the regeneration fan faces the adsorption device.

[0009] The first valve is arranged at the first air outlet of each adsorption device and located on the air inlet pipeline. The second valve is arranged at the second air outlet of each adsorption device and located on the air outlet pipeline. The third valve is arranged at the second air outlet of each adsorption device and located on the desorption pipeline.

[0010] In a possible implementation, the gas heating equipment is further included. The air outlet end of the gas heating equipment is connected with the desorption pipeline, and is suitable for injecting hot air into the desorption pipeline, so as to heat the adsorption purifying agent and resolve the adsorbed harmful gas.

[0011] In a possible implementation, the first air outlet of each adsorption device is connected with the waste gas treatment equipment through the waste gas pipeline.

[0012] In a possible implementation, the waste gas treatment equipment is an RTO furnace.

[0013] In a possible implementation, the first concentration detector is arranged on the air inlet pipeline and located on the suction side of the coal mine main fan, and is suitable for detecting the methane gas concentration at the air outlet of the return air shaft.

[0014] In a possible implementation, the second concentration detector is arranged at the second air outlet of each adsorption device and located on the air outlet pipeline.

[0015] In a possible implementation, the adsorption device is provided with two adsorption devices.

[0016] According to an aspect of the present application, a kind of exhaust air treatment process is provided, using coal mine exhaust air circulation into mine concentration system and processing, comprising:

[0017] opening the first valve and the second valve of at least one adsorption device,

[0018] opening the coal mine main fan and the exhaust air circulation fan, so that the exhaust air to be processed enters the air inlet pipeline from the air outlet of the return air shaft under the suction of the coal mine main fan and is transported to the adsorption device;

[0019] The adsorption purifying agent in the adsorption device adsorbs the air to be treated to obtain treated air meeting the recycling into mine standard;

[0020] The treated air is sucked into the air outlet pipeline from the adsorption device under the suction of the air recycling fan and is transported to the air inlet shaft.

[0021] In a possible implementation, when the adsorption purifying agent in the adsorption device is saturated, the first valve and the second valve of the adsorption device are closed, and the third valve of the adsorption device is opened, so that the hot air is introduced into the adsorption device to desorb and analyze the saturated adsorption purifying agent.

[0022] Advantages: The air inlet pipeline is suitable for introducing the air to be treated released from the air outlet shaft into two or more adsorption devices, and the adsorption purifying agent in the two or more adsorption devices can adsorb carbon monoxide and other toxic and harmful gases in the air to be treated to increase the methane concentration in the air to meet the recycling into mine requirement; the air outlet pipeline is suitable for collecting and transporting the treated air after the adsorption of each adsorption device to the air inlet shaft to complete the recycling into mine; the desorption pipeline connected with the second air port of each adsorption device is suitable for introducing hot air from the second air port into the adsorption device to desorb and analyze the saturated adsorption purifying agent, and the desorbed harmful gas flows out of the first air port of the adsorption device and is transported to the waste gas treatment equipment for purification and destruction; the coal mine air is recycled into the mine again after the adsorption and purification, and the recycled air into the mine is non-toxic and harmless; at the same time, the recycling of the air can increase the methane concentration in the air to improve the utilization rate of the air, reduce the emission, reduce the energy loss, and avoid serious environmental pollution.

[0023] Other features and aspects of the present application will become apparent from the following detailed description of exemplary embodiments with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0024] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments, features, and aspects of the present application and serve to explain the principles of the present application.

[0025] Figure 1 A structure connection diagram of the coal mine air recycling into mine concentration system is shown.

[0026] The air inlet pipeline 100, the air outlet pipeline 200, the desorption pipeline 300, the adsorption purifying agent 430, the coal mine main fan 400, the air recycling fan 500, the regeneration fan 600, the gas heating equipment 800, the waste gas treatment equipment 700, the waste gas pipeline 710, the first concentration detector 120, the second concentration detector 414, and the third concentration detector 720. DETAILED DESCRIPTION

[0027] Various exemplary embodiments, features, and aspects of the present application will be described in detail below with reference to the accompanying drawings. The same reference numerals in the accompanying drawings represent elements with the same or similar functions. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless otherwise indicated.

[0028] It should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention or simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0030] The word “exemplary” is used exclusively herein to mean “serving as an example, example, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0031] In addition, numerous specific details are provided in the detailed description below to better illustrate the present application. Those skilled in the art will appreciate that the present application can be practiced without certain specific details. In some instances, methods, means, components, and circuits well known to those skilled in the art are not described in detail in order to highlight the main purpose of the present application.

[0032] Figure 1 The structural connection diagram of the coal mine ventilation air circulation and concentration system according to the embodiment of the present application is shown. Figure 1As shown, the coal mine ventilation air methane recycling into mine concentration system comprises: an air inlet pipeline 100, an air outlet pipeline 200, a desorption pipeline 300, two or more adsorption devices and a regeneration fan 600; one end of the air inlet pipeline 100 is adapted to be connected to an air outlet of an air return shaft; the air inlet pipeline 100 and a first air port of each adsorption device are connected and adapted to introduce ventilation air to be treated into the adsorption device; an adsorption purifying agent 430 is arranged in the adsorption device and adapted to purify and adsorb the ventilation air to be treated released from the air return shaft; a second air port of each adsorption device is connected to the air outlet pipeline 200, and the other end of the air outlet pipeline 200 is adapted to be connected to an air inlet of an air inlet shaft; the desorption pipeline 300 is connected to the second air port of each adsorption device and adapted to introduce hot air into the adsorption device to desorb the adsorption purifying agent 430 in the adsorption device; the first air port of each adsorption device is also connected to a waste gas treatment device and adapted to introduce the desorbed gas into the waste gas treatment device; a coal mine main fan 400 is arranged on the air inlet pipeline 100, and a blowing side of the coal mine main fan 400 faces the adsorption device; a ventilation air methane recycling fan 500 is arranged on the air outlet pipeline 200, and a suction side of the ventilation air methane recycling fan 500 faces the adsorption device; a regeneration fan 600 is arranged on the desorption pipeline 300, and a blowing side of the regeneration fan 600 faces the adsorption device; a first valve is arranged at the first air port of each adsorption device and located on the air inlet pipeline 100; a second valve is arranged at the second air port of each adsorption device and located on the air outlet pipeline 200; and a third valve is also arranged at the second air port of each adsorption device and located on the desorption pipeline 300.

[0033] Here, it needs to be explained that the return air shaft refers to the air shaft that discharges the spent air in the mine ventilation system, and the air inlet shaft is the air inlet shaft of the mine; the air inlet pipe 100 is suitable for introducing the treated spent air discharged from the return air shaft into two or more adsorption devices, when the treated spent air passes through the two or more adsorption devices, the internal adsorption purifying agent 430 can adsorb and purify the carbon monoxide gas and other toxic and harmful gases in the treated spent air, and after reaching the standard requirements of the spent air circulating into the mine, the treated spent air is sent back into the mine through the air outlet pipe 200, and after the treated spent air flows through the inside of the mine again to carry gas again, it is discharged from the return air shaft, and then it is sent into the adsorption device again for adsorption and purification, and finally it is sent into the mine again through the air inlet shaft to form the spent air circulating into the mine; therefore, in the process of continuous circulation into the mine, the methane in the spent air will increase continuously until the methane concentration reaches the critical value and the spent air is discharged from the system; wherein the coal mine main fan 400 on the air inlet pipe 100 is suitable for increasing the flow speed of the treated spent air in the air inlet pipe 100, so that the treated spent air can quickly enter the adsorption device; the air outlet pipe 200 is suitable for collecting and transporting the treated spent air after the adsorption of each adsorption device to the air inlet shaft to complete the spent air circulating into the mine. At the same time, due to the multiple circulation of the spent air, the methane concentration in the spent air will be increased, and the utilization rate will be improved without the need to inject and mix the extracted gas throughout the process, which is convenient for the subsequent destruction of the spent air, reduces the emission amount, reduces energy loss, and avoids serious environmental pollution.

[0034] In order to realize zero emission of coal mine gas and destroy the spent air with minimum energy consumption, the present application circulates the partially purified spent air into the mine, reduces the total emission volume, and concentrates and increases the methane volume concentration in the spent air, so that the methane volume concentration is finally concentrated to close to 0.3% and not more than 0.3%, which provides convenient conditions for subsequent complete destruction and efficient utilization of gas.

[0035] However, the discharged treated spent air may contain trace amounts of carbon monoxide, carbon dioxide, hydrogen sulfide and other harmful gases, so the harmful gases need to be adsorbed and removed before circulating into the mine, so that the treated spent air meets the standard of circulating into the mine to ensure that the spent air circulating into the mine is non-toxic and harmless. It needs to be explained that the standard of the treated spent air circulating into the mine is that the carbon monoxide concentration meets the secondary concentration limit (applicable to Class II functional areas) in Table I of the "Environmental Air Pollutant Basic Item Concentration Limit" in the GB3095-2021 "Environmental Air Quality Standard" document (i.e. the 1-hour average concentration of carbon monoxide needs to be less than 10 mg / m 3 ); the suspended particulate matter concentration meets the secondary concentration limit in Table II of the "Environmental Air Pollutant Other Item Concentration Limit"; the hydrogen sulfide concentration and the carbon dioxide concentration need to meet the concentration limit specified in the "Atmospheric Pollutant Comprehensive Emission Standard"; to ensure the air quality in the mine and the physical health of the mine workers.

[0036] Further, desorption of the gas on the adsorption medium needs to be timely resolved after the adsorption medium approaches saturation, to avoid affecting the purification effect after adsorption saturation; the desorption pipeline 300 is connected with the second air port of each adsorption device, suitable for introducing hot air from the second air port into the adsorption device to desorb the adsorption purifying agent 430 inside, and the desorbed harmful gas flows out through the first air port of the adsorption device and is transported to the waste gas treatment equipment for purification and destruction; the first air port of each adsorption device is provided with a first valve, and the second air port of each adsorption device is provided with a second valve and a third valve, and by controlling the on-off of the first valve, the second valve and the third valve of each adsorption device, it can be controlled at any time whether the adsorption device is put into adsorption and purification of the waste air or into desorption; it should be noted that all adsorption devices in the present application can simultaneously adsorb and purify the waste air to be treated, and then all adsorption devices simultaneously desorb the adsorption purifying agent 430, and this way can process a large amount of waste air to be treated at one time; the present application can also use a part of the adsorption device to adsorb and purify the waste air to be treated, and the other part to desorb the adsorption purifying agent 430, and then cycle alternately, which can realize uninterrupted treatment of the waste air to be treated. After the waste air to be treated discharged from the return air shaft is adsorbed and purified by the present application, the waste air can be recycled into the mine to replace fresh air, and the waste air recycled into the mine is non-toxic and harmless.

[0037] In a possible implementation, the gas heating device 800 is further included; the air outlet end of the gas heating device 800 is connected with the desorption pipeline 300, suitable for injecting hot air into the desorption pipeline 300. Here, it should be noted that the gas heating device 800 is suitable for heating gas and injecting hot gas into the desorption pipeline 300.

[0038] Further, the gas heating device 800 adopts a gas heater. The gas heating device 800 can be installed before the inlet of the regenerative fan 600, or can be installed after the outlet of the regenerative fan 600, preferably, the gas heating device 800 and the regenerative fan 600 are arranged in sequence along the flow direction of the air in the desorption pipeline 300.

[0039] Preferably, the gas heating device 800 adopts a flue gas heat exchanger, which can avoid a large amount of water generated by the adsorption purifying agent 430 due to cold and hot alternation, damage to the adsorption purifying agent 430, or cause the adsorption purifying agent 430 to be blocked, the resistance to increase, or even to be invalid due to long-term water.

[0040] It should be noted that according to the characteristics of the adsorption purifying agent 430, the temperature of the hot air heated by the gas heating device 800 should be greater than 100℃ and less than 150℃, which meets the resolution effect in the heating process.

[0041] In a possible implementation, the first air outlet of each adsorption device is connected with the waste gas pipeline 710 and the waste gas treatment device 700. As shown in Figure 1 , the fourth valve is arranged at the first air outlet of each adsorption device and on the waste gas pipeline 710.

[0042] In a possible implementation, the waste gas treatment device 700 is an RTO furnace (regenerative thermal oxidizer), which can treat the desorbed waste gas, has high purification efficiency, and avoids environmental pollution caused by directly discharging the waste gas into the atmosphere.

[0043] In a possible implementation, the first concentration detector 120 is arranged on the air inlet pipeline 100 and located at the air suction side of the coal mine main fan 400, and is suitable for detecting the methane gas concentration at the air outlet of the air return shaft, that is, detecting the methane gas concentration in the to-be-treated ventilation air. It should be noted that, according to relevant regulations, the methane concentration must be controlled below 0.75%, and higher than 0.5% will be defined as a safety accident, and the ventilation air circulation will appropriately increase the methane concentration therein. The methane concentration of the circulating ventilation air in the present application is taken as a critical point that the total exhaust air methane content is not more than 0.3%. When the exhaust air methane concentration detected by the first concentration detector 120 reaches 0.3%, the circulation purification can be stopped or the circulation amount can be reduced, to ensure the safety of the mine ventilation.

[0044] In a possible implementation, as shown in Figure 1 , the second concentration detector 414 is arranged at the second air outlet of each adsorption device and on the air outlet pipeline 200; the second concentration detector 414 adopts a multi-channel gas analyzer; the second concentration detector 414 is suitable for detecting the carbon monoxide concentration, the carbon dioxide concentration, and the hydrogen sulfide concentration in the treated ventilation air; and whether the treated ventilation air meets the circulation into-mine standard (standard value) is determined according to the detected carbon monoxide concentration, carbon dioxide concentration, and hydrogen sulfide concentration. Meanwhile, when the carbon monoxide concentration detected by the second concentration detector 414 reaches or exceeds the index required by the second functional area, the first valve and the second valve are closed; the system circulation is stopped, and desorption regeneration is performed, so that the adsorption purification agent 430 reaches the adsorption saturation state; the adsorbed harmful gas (carbon monoxide, carbon dioxide, and hydrogen sulfide) is desorbed and analyzed by heating the adsorption purification agent 430 with hot air, and the analyzed gas is sent to the waste gas treatment device 700 through the waste gas pipeline 710 for destruction treatment.

[0045] In a possible implementation, the third concentration detector 720 is arranged on the exhaust pipe 710, and is adapted to detect the carbon monoxide concentration in the exhaust pipe 710; the desorption degree of the adsorption purifying agent 430 is confirmed by the measured carbon monoxide concentration; when the carbon monoxide concentration in the exhaust pipe 710 is reduced to a certain threshold value and the carbon monoxide concentration no longer continues to decrease after the desorption continues, it is determined that the desorption work is completed, and the desorption and resolution of the adsorption purifying agent 430 can be stopped.

[0046] As shown in Figure 1 each adsorption device includes an adsorption box and an adsorption purifying agent 430 filled in the adsorption box, and the first air port and the second air port are located on opposite sides of the adsorption box to facilitate the rapid circulation of air; the adsorption purifying agent 430 is stacked in the adsorption box.

[0047] In a possible implementation, the adsorption purifying agent 430 is an acid gas adsorbent; preferably, the adsorption purifying agent 430 is silica gel, which can adsorb carbon dioxide, carbon monoxide, and hydrogen sulfide and other harmful gases in the exhaust air to be treated.

[0048] In a possible implementation, the top surface of the adsorption purifying agent 430 is attached to an adsorption layer 440; preferably, the adsorption layer 440 is made of activated carbon, which can remove odors in the exhaust air to be treated.

[0049] The adsorption purifying agent 430 and the adsorption layer 440 can simultaneously adsorb carbon monoxide, carbon dioxide, hydrogen sulfide, and odors in the exhaust air to be treated, and impurities in the exhaust air to be treated are also blocked and filtered in the adsorption device.

[0050] Here, it should be noted that the specific loading amount of the adsorption purifying agent 430 is based on the composition analysis data of the exhaust air of different coal mines, and is mainly based on temperature swing adsorption. The specific loading amount of the adsorption purifying agent 430 is comprehensively calculated according to the designed regeneration period, the mixed flow of the exhaust air, and the concentrations of carbon monoxide, carbon dioxide, and hydrogen sulfide detected before adsorption. The loading amount can consider the surplus amount based on the design calculation amount, and the adsorption amount of the adsorption purifying agent 430 is equal to the adsorption amount of the adsorption purifying agent per unit volume multiplied by the loading amount of the adsorption purifying agent. The design is based on the total amount of the adsorbed gas contained in the exhaust air being greater than the adsorption amount in the cycle period.

[0051] The calculation formula of the loading amount of the adsorption purifying agent 430 is as follows:

[0052] V = Q × △t × m1 ÷ m0 × ω

[0053] V: the loading amount of the adsorption purifying agent (m 3 )

[0054] Q: the exhaust air flow (m3 / min)

[0055] Δt: cycle period (min), that is, the adsorption purification time between the completion of the last desorption and the start of the next desorption;

[0056] m 1： The total content of CO, CO2 and H2S in the exhaust air (mg / m 3 )

[0057] m 0： The adsorption capacity of the adsorption purification agent per unit volume, that is, the adsorption capacity of the adsorption purification agent per unit volume for CO, CO2 and H2S (mg / m 3 )

[0058] ω: safety factor; the value range of ω is 1.2-1.5, and a larger value is taken for the exhaust air with higher actual CO, CO2 and H2S content.

[0059] Description: The calculation amount of the patent is not the difference between the import and export harmful gas contents, but directly uses the import content as the calculation basis, and the purpose is to obtain the air quality standard due to the above.

[0060] In one possible implementation, two adsorption devices are provided; it should be noted that the number of adsorption devices can be increased or decreased according to the exhaust air flow of different coal mines.

[0061] A kind of exhaust air treatment process, using coal mine exhaust air circulation into mine concentration system for processing, comprising: opening the first valve and the second valve of at least one adsorption device, opening coal mine main fan 400 and exhaust air circulation fan 500, so that the exhaust air to be processed is under the suction of coal mine main fan 400 from the air outlet of return air shaft into the air inlet pipeline 100 and transported to the adsorption device;The adsorption purification agent 430 in the adsorption device adsorbs the exhaust air to be processed to obtain the treated exhaust air meeting the circulation into mine standard;The treated exhaust air is under the suction of exhaust air circulation fan 500 from the adsorption device into the air outlet pipeline 200 and transported to the air inlet shaft. Here, it should be noted that since the adsorption device is provided with multiple, at least one adsorption device is put into adsorption for treating exhaust air, a part of the adsorption device can also be put into adsorption for treating exhaust air, and all the adsorption devices can also be put into adsorption for treating exhaust air, it should be noted that the number of adsorption devices put into adsorption can be adjusted according to the air volume of exhaust air.

[0062] The present application uses the principle of temperature swing adsorption purification, which can adsorb at room temperature and desorb at high temperature.

[0063] Meanwhile, the methane concentration of the to-be-treated exhaust air in the air inlet pipeline 100 measured by the first concentration detector 120 is used to determine whether the system cycle needs to be stopped and the exhaust air is timely led out of the system. Further, when the methane concentration detected by the first concentration detector 120 reaches 0.3%, the first valve and the second valve of all the adsorption devices are closed, and the exhaust air circulation work is stopped.

[0064] Meanwhile, the concentrations of carbon monoxide, carbon dioxide and hydrogen sulfide in the exhaust air in the air outlet pipeline 200 after treatment measured by the second concentration detector 414 are used to determine whether the exhaust air after treatment meets the circulation into the mine standard. Further, when the carbon monoxide concentration detected by the second concentration detector 414 reaches or exceeds the index required by the second functional area, it indicates that the adsorption purifying agent 430 in the adsorption device reaches the saturated state.

[0065] In a possible implementation, when the adsorption purifying agent 430 in the adsorption device reaches the saturated state, the first valve and the second valve of the adsorption device are closed, and the third valve of the adsorption device is opened, and the hot air is introduced into the adsorption device through the desorption pipeline 710 to desorb the adsorption purifying agent 430 in the adsorption device.

[0066] Meanwhile, the carbon monoxide concentration measured by the third concentration detector 720 is used to determine whether the desorption of the adsorption purifying agent in the adsorption device is completed.

[0067] In a possible implementation, when the desorption of the adsorption purifying agent 430 in the adsorption device is completed, the third valve of the adsorption device is closed, and the first valve and the second valve of the adsorption device are opened; and the adsorption device is put into the adsorption work again.

[0068] It should be noted that, generally, the adsorption is 30 minutes, and then the desorption is analyzed once, and after the desorption analysis is completed, the adsorption operation is put into again.

[0069] Further, as shown in Figure 1 , the adsorption device is provided with two, and one of the adsorption devices is set as the first adsorption device 410; and the other adsorption device is the second adsorption device 420.

[0070] The two adsorption devices are set to be alternately used for adsorption purification. In the initial state, the first valve 411 of the first adsorption device 410 is opened, the second valve 412 of the first adsorption device 410 is opened, the third valve 413 of the first adsorption device 410 is closed, the fourth valve 711 of the first adsorption device 410 is closed, the first valve 421 of the second adsorption device 420 is closed, the second valve 422 of the second adsorption device 420 is closed, the third valve 423 of the second adsorption device 420 is closed, and the fourth valve 712 of the second adsorption device 420 is closed. The main fan 400 of the coal mine is opened, the first adsorption device 410 is used for adsorption purification of the treated waste air, and the second adsorption device 420 is in an idle state.

[0071] When the adsorption purification agent 430 of the first adsorption device 410 reaches the first adsorption saturation state, the first valve 411 of the first adsorption device 410 is closed, the second valve 412 of the first adsorption device 410 is closed, the third valve 413 of the first adsorption device 410 is opened, the fourth valve 711 of the first adsorption device 410 is opened, the first valve 421 of the second adsorption device 420 is opened, the second valve 422 of the second adsorption device 420 is opened, the third valve 423 of the second adsorption device 420 is closed, and the fourth valve 712 of the second adsorption device 420 is closed. The second adsorption device 420 starts to adsorb the treated waste air. The gas heating device 800 and the regenerative fan 600 are opened, hot air is sent into the first adsorption device 410 and heats and desorbs the adsorption purification agent 430 inside, the generated waste gas directly enters the waste gas treatment device 700 from the waste gas pipeline 710, and when the carbon monoxide concentration detected by the third concentration detector 720 no longer changes, the heating of the adsorption purification agent 430 is stopped. The first valve 411 of the first adsorption device 410 is opened again, the second valve 412 of the first adsorption device 410 is opened again, the third valve 413 of the first adsorption device 410 is closed again, the fourth valve 711 of the first adsorption device 410 is closed again, and the adsorption purification mode is switched to adsorb and purify the treated waste air. Similarly, when the adsorption purification agent 430 of the second adsorption device 420 reaches the adsorption saturation state, the first valve 421 of the second adsorption device 420 is closed, the second valve 422 of the second adsorption device 420 is closed, the third valve 423 of the second adsorption device 420 is opened, and the fourth valve 712 of the second adsorption device 420 is opened. The gas heating device 800 and the regenerative fan 600 are opened, hot air is sent into the second adsorption device 420 and heats and desorbs the adsorption purification agent 430 inside, and after the desorption is completed, the adsorption is used again. The two adsorption devices are alternately used for adsorption of the treated waste air, and the continuous cyclic adsorption effect is realized.

[0072] By the recycling of the ventilation air methane of the application, on the one hand, the negative energy output is changed into positive energy output, on the other hand, the investment can be reduced by several times and the return on investment can be increased, realizing the self-heating balance of the subsequent mine ventilation air methane destruction, at the same time, the heating load in winter can be reduced; taking a mine with 0.1% methane content in ventilation air and 1 million cubic meters per hour of total ventilation air flow as an example, the methane content in ventilation air is increased to 0.3% by the recycling method of the application, at this time, the ventilation air discharge volume flow will become 330,000 cubic meters per hour, that is, the air flow supplemented will become 330,000 cubic meters per hour. The number of destruction devices constructed and the processing volume flow will become 1 / 3 of the original, the investment will also become 1 / 3 or even less, on the contrary, the output heat and energy consumption will be more reasonable and efficient.

[0073] The above has described various embodiments of the application, the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those skilled in the art without departing from the scope and spirit of the described embodiments. The choice of terms used herein is intended to best explain the principles, practical application or improvement of technology in the market of the embodiments, or to enable other ordinary skilled in the art to understand the embodiments disclosed herein.

Claims

1. A coal mine ventilation air circulation and concentration system, characterized in that: include: Air inlet duct, air outlet duct, desorption duct, two or more adsorption devices and regeneration fan; One end of the air inlet duct is suitable for connecting to the air outlet of the return air shaft; the air inlet duct is connected to the first air outlet of each adsorption device and is suitable for introducing the exhaust air to be treated into the adsorption device; The adsorption device is provided with an adsorption purifier, which is suitable for purifying and adsorbing the exhaust air to be treated released from the return air shaft. The second air outlet of each of the adsorption devices is connected to the air outlet duct, and the other end of the air outlet duct is suitable for connecting to the air inlet of the air inlet shaft, so that the exhaust air to be treated released from the return air shaft is sent back to the air inlet shaft after passing through the adsorption device; The desorption pipe is connected to the second air outlet of each adsorption device and is suitable for introducing hot air into the adsorption device to desorb the adsorption purifier therein. The first air outlet of each adsorption device is also connected to the exhaust gas treatment equipment and is suitable for introducing the desorbed gas into the exhaust gas treatment equipment. The air inlet duct is provided with a main coal mine fan, the blowing side of which is directed toward the adsorption device; the air outlet duct is provided with an exhaust air circulation fan, the suction side of which is directed toward the adsorption device; the desorption duct is provided with a regeneration fan, the blowing side of which is directed toward the adsorption device; A first valve is provided at the first air outlet of each adsorption device, and the first valve is located on the air inlet duct; a second valve is provided at the second air outlet of each adsorption device, and the second valve is located on the air outlet duct; a third valve is also provided at the second air outlet of each adsorption device, and the third valve is located on the desorption duct; Also includes gas heating equipment; The air outlet end of the gas heating device is connected to the desorption pipe, and is suitable for injecting hot air into the desorption pipe to heat the adsorption purifier and desorb the harmful substances adsorbed by the adsorption purifier; The first air outlet of each of the adsorption devices is connected to the exhaust gas treatment equipment through an exhaust gas pipe; The calculation formula for the loading amount of the adsorption purifier is: V=Q×△t×m1÷m0×ω V: the loading amount of the adsorption purifier m 3 ; Q: exhaust air flow to be processed m 3 / min; △t: cycle time min, that is, the adsorption purification time between the completion of the last desorption and the start of the next desorption; m1: The total content of CO, CO2 and H2S in the ventilation air to be treated (mg / m) 3 ; m0: adsorption capacity per unit volume of the adsorption purifier mg / m 3 , i.e. the total adsorption capacity of the adsorption purifier per unit volume for CO, CO2 and H2S; ω: safety factor; the value range of ω is 1.2-1.

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2. The coal mine ventilation air circulation and concentration system according to claim 1 is characterized in that: The waste gas treatment equipment is an RTO furnace.

3. The coal mine ventilation air circulation and concentration system according to claim 1 is characterized in that: A first concentration detector is provided on the air inlet duct and is located on the suction side of the main fan of the coal mine, and is suitable for detecting the methane gas concentration at the air outlet of the return air shaft.

4. The coal mine ventilation air circulation and concentration system according to claim 1 is characterized in that: A second concentration detector is provided at the second air outlet of each adsorption device, and the second concentration detector is located on the air outlet duct.

5. The coal mine ventilation air circulation and concentration system according to any one of claims 1 to 4, characterized in that: There are two adsorption devices.

6. A ventilation air treatment process, characterized in that: The method comprises the following steps: using the coal mine ventilation air circulation and concentration system according to any one of claims 1 to 5 for treatment, comprising: Opening the first valve and the second valve of at least one of the adsorption devices, Turn on the main fan of the coal mine and the exhaust air circulation fan, so that the exhaust air to be treated enters the air inlet duct from the air outlet of the return air shaft under the suction effect of the main fan of the coal mine and is transported to the adsorption device; The adsorption purifier in the adsorption device adsorbs the exhaust air to be treated to obtain treated exhaust air that meets the recycling standard for mining; The treated exhaust air enters the air outlet duct from the adsorption device under the suction action of the exhaust air circulation fan and is transported to the air inlet shaft.

7. The ventilation air treatment process according to claim 6, characterized in that: When the adsorption purifier in the adsorption device reaches saturation, the first valve and the second valve of the adsorption device are closed, and the third valve of the adsorption device is opened. The desorption pipe introduces hot air into the adsorption device to desorb the adsorption purifier inside.

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