An integrated system and method for efficient utilization of underground gas and gas extraction

Abstract

The application discloses an underground gas efficient utilization and gas extraction integrated system and method, and relates to the technical field of energy system optimization. The system comprises the following steps: introducing a certain amount of air and gas mixture to start a burner; conveying part of high-temperature flue gas to a steam turbine to generate power; converting part of the flue gas into carbon dioxide, and simultaneously injecting the carbon dioxide and an inorganic salt solution into a coal seam; displacing gas and promoting gas extraction, and the extracted gas is used for combustion to form a closed-loop emission reduction mode. The system further comprises an underground gas power generation system, a heat injection system, a liquid injection system, a gas extraction system, an underground power supply system and an independent ventilation system. The application effectively solves the problems of low extraction efficiency, leakage and explosion risks in the gas extraction process.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy system optimization, and in particular to an underground gas efficient utilization and gas extraction integrated system and method. BACKGROUND

[0002] Coal is an important part of China's energy structure. According to statistics, by the end of 2021, China's coal resources reserves were 207.885 billion tons. Coal and gas are interdependent and inseparable. Gas is inevitably produced during coal mining. Coal mine gas, also known as coal bed methane, is mainly composed of methane. Gas is one of the main sources of coal mine gas explosion, coal and gas outburst and other coal mine accidents. At the same time, gas is a clean energy. By the end of 2020, the cumulative proven geological reserves of coal gas were 938 billion cubic meters. Developing and utilizing gas can not only achieve the goal of "waste into treasure" and obtain direct economic benefits, but also achieve the goal of energy saving and emission reduction.

[0003] Gas extraction is the main way to reduce coal mine gas disasters, realize gas utilization and optimize energy structure. For gas extraction work, China has proposed the policy of "first extraction, then mining, as much as possible, and promoting extraction with use" to guide its development. Most of China's coal mines are underground mines, and the main extraction technology used is underground drilling extraction technology. However, conventional extraction technology is difficult to effectively reduce the gas content in the coal seam, mainly because about 20% of the gas is stored in the coal seam in the form of free state, and about 80% of the gas is stored in the coal seam in the form of adsorption state. Free state refers to the state in which gas exists as a free gas in the cracks and pores of coal or surrounding rock. Adsorption state refers to the state in which free gas molecules are tightly adsorbed on the pore wall of coal due to the attraction of solid molecules on the surface of the pore, thereby forming a very thin adsorption layer. Conventional extraction can only extract free state gas in cracks and pores, and most of the adsorbed state gas existing in the coal body cannot be discharged. In the process of gas extraction, gas will bring out impurities such as coal slag, coal powder and water vapor in the coal seam, causing blockage and corrosion of the pipeline or gas extraction pump. Therefore, in the process of underground gas extraction in coal mines, the risk of gas disaster is high. At the same time, most of China's mining areas have the characteristics of compressibility and easy rheology, high stress, high gas, strong adsorption, low permeability and low permeability, combined with complex geological conditions, which seriously restricts the safe and efficient production and use of coal and gas. With the increase of mining depth, the ground stress in the coal seam also increases, the permeability further decreases, and the gas emission amount also increases, thereby increasing the risk of mine exploitation and the difficulty of gas extraction. SUMMARY

[0004] The purpose of this section is to summarize some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract and title of this application to avoid obscuring the purpose of this section, the abstract and the title of the invention, and such simplifications or omissions should not be used to limit the scope of the present invention.

[0005] In view of the problems that the above-mentioned existing gas mining process has low mining efficiency and is prone to risks such as leakage and explosion, the present invention is proposed.

[0006] To solve the above technical problems, the present invention provides the following technical solution: a method for integrating underground gas efficient utilization and gas extraction, comprising the following steps:

[0007] S1: Start the burner by introducing a certain amount of air and gas mixture;

[0008] S2: transports part of the high-temperature flue gas to the steam turbine for power generation;

[0009] S3: convert part of the flue gas into carbon dioxide, and inject the carbon dioxide and inorganic salt solution into the coal seam simultaneously;

[0010] S4: Displace gas and promote gas extraction. The extracted gas is used for combustion, forming a closed-loop emission reduction model.

[0011] In order to solve the above technical problems, the present invention provides the following technical solutions: an integrated system for efficient utilization and gas extraction of underground gas, which is applied to the above-mentioned integrated method for efficient utilization and gas extraction of underground gas. The integrated system for efficient utilization and gas extraction of underground gas includes: an underground gas power generation system, a heat injection system, a liquid injection system, a gas extraction system, an underground power supply system and an independent ventilation system.

[0012] As a preferred solution of the integrated system for efficient utilization and gas extraction of underground gas in the present invention, the air supply system and the coal mine gas supply system in the gas power generation system are connected to the gas mixing chamber through the air inlet pipe and the extraction pipe respectively; the ports of the burner are connected to the waste heat boiler, the water storage tank and the circulating water treatment system through pipelines respectively; the circulating water treatment system includes a waste heat boiler, a steam turbine connected to the waste heat boiler, a condenser and a water storage tank; the heat injection system includes a plurality of gas injection holes drilled into the coal seam from the well, and all the gas injection holes are connected to the discharge end of the gas treatment chamber through gas injection pipes and a No. 1 booster pump; the gas extraction system includes a plurality of extraction holes drilled into the coal seam from the well, and all the extraction holes are connected to the front end of the gas mixing chamber through extraction pipes and a gas extraction pump; the liquid injection system includes a plurality of liquid injection holes drilled into the coal seam from the well, and all the liquid injection holes are connected to the inorganic salt solution storage tank through injection pipes and a No. 1 booster pump.

[0013] As a preferred scheme of the underground gas efficient utilization and gas extraction integrated system, the underground power supply system comprises steam turbine generated electric energy transmitted to the temporary refuge chamber, lighting lamps, other electric equipment and power grid through power transmission lines; the independent ventilation system comprises an air inlet fan and an air outlet fan; the air inlet and the air outlet of the ventilation system are located at two sides of the coal mine respectively, the surface air is delivered to the air inlet through the air inlet fan in positive pressure to perform ventilation work on the mine with appropriate air volume, the air after ventilation flows into the air outlet, and the air after ventilation is extracted by the air outlet fan in negative pressure; the liquid injection pipe is made of high-temperature resistant and corrosion resistant material; the power generation chamber and the temporary refuge chamber are both provided with thickened steel explosion-proof doors with super strong anti-overpressure and pressure-resistant, high-temperature resistant and explosion-proof protective sealed walls.

[0014] Another problem to be solved by the present application is that the gas extraction pump lacks the function of filtering coal cinder and water vapor in the gas extraction process, which easily causes the problem of equipment blockage.

[0015] To solve the above technical problems, the present application provides the following technical scheme: a coal cinder and water vapor filtering device in a gas, characterized in that: applied to the underground gas efficient utilization and gas extraction integrated system, the filtering device comprises a conveying unit, a filtering unit and a collecting unit, the conveying unit comprises a gas conveying pipeline and an auxiliary pipeline connected to one side of the gas conveying pipeline; the filtering unit comprises a filter cover and an absorption cover arranged in the gas conveying pipeline in sequence; and the collecting unit comprises a sealing plate and a collecting box, the sealing plate is inserted into the side wall of the auxiliary pipeline in the vertical direction in a matched mode, the collecting box is arranged at the bottom end of the sealing plate and can close the opening of the auxiliary pipeline in a matched mode; a driving assembly comprises a driving motor, a driven part, a belt and a turning part, the driven part is provided with multiple groups, the output shaft of the driving motor is connected with the driven part, the output shaft of the driven part is engagedly connected with the filtering unit, the belt is sleeved on the driven part, and the turning part is connected with the driven part through the belt at one end and movably connected with the absorption cover at the other end.

[0016] As a preferred scheme of the coal cinder and water vapor filtering device in a gas, the gas conveying pipeline is provided with openings at two ends, which are an input port and an output port respectively, and the side wall of the gas conveying pipeline is provided with a lower leakage hole; the input port is provided with a conical aggregation part towards the inside of the pipeline; the auxiliary pipeline comprises an inclined section pipeline and a vertical section pipeline, one end of the inclined section pipeline with a larger size is connected with the lower leakage hole, and the other end is connected with the vertical section pipeline.

[0017] As a preferred scheme of the coal cinder and water vapor filtering device in gas, wherein: the filtering cover comprises a fixed shell, a filtering shell, a rotating shell and a leakage-proof baffle; the fixed shell is connected with the inner wall of the gas pipeline, and the outer wall of the fixed shell is open; the filtering shell is a semispherical structure, and the circular edge of the filtering shell is connected with the fixed shell; the filtering shell is uniformly provided with filtering holes; the rotating shell comprises a shell body, and the shell body is also a semispherical structure; the size of the spherical outer wall of the shell body is the same as the size of the inner wall of the filtering shell, and the shaft centers are located on the same straight line; the shell body is also uniformly provided with adjusting holes; the diameter of the adjusting holes is larger than the diameter of the filtering holes; the shell body is further provided with a rotating shaft on the shaft line; the rotating shaft is provided with a first conical gear groove at the end away from the shell body; the first conical gear groove is connected with the top end of the output shaft of the driven part; the leakage-proof baffle is connected with the opening of the fixed shell; and the end away from the fixed shell is provided with an inclined surface, and the inclined surface is parallel to the inclined surface of the inclined section pipeline.

[0018] As a preferred scheme of the coal cinder and water vapor filtering device in gas, wherein: the absorbing cover is arranged on the inner wall of the gas pipeline close to the output port, and comprises a connecting shell, water absorbing cotton and an extrusion piece; the inner wall of the connecting shell is provided with an extrusion boss, the middle part of the extrusion boss is open, and the extrusion boss forms a water extrusion area with the connecting shell; the water absorbing cotton is placed in the water extrusion area; the extrusion piece is arranged at the opening of the end of the connecting shell with the water extrusion area; the outer diameter of the extrusion piece is equal to the inner diameter of the connecting shell; the middle part of the extrusion piece is open; the end away from the connecting shell is further connected with a push rod; and the other end of the push rod is connected with a back-shaped sliding block.

[0019] As a preferred scheme of the coal cinder and water vapor filtering device in gas, wherein: the outer wall of one side of the vertical section pipeline is provided with a placing boss, and the outer wall of the other side is provided with a limiting boss; the top end of the placing boss is connected with the slope side wall of the inclined section pipeline; the inside of the placing boss is provided with a placing layer; the placing layer is in turn transversely connected with the placing boss, the vertical section pipeline and the limiting boss; the sealing plate is slidingly arranged in the placing layer; the two ends of the sealing plate, which are parallel to the shaft center of the gas pipeline, are provided with moving plates; the moving plates are uniformly provided with clamping holes; the end of the placing boss away from the inclined section pipeline is symmetrically provided with gear grooves corresponding to the moving plates; a plurality of groups of gears are symmetrically arranged in the gear grooves; the gears are in meshing connection with the clamping holes; the collecting box comprises a box body and contact blocks; the contact blocks are symmetrically arranged at the top end of the box body; and the contact blocks are in meshing connection with the gears.

[0020] As a preferred scheme of the coal residue and water vapor filtering device in the gas, the follower is arranged corresponding to the filtering cover, including a rotating disc, a support table and a support sleeve, the support table is fixedly connected to the outer wall of the gas pipeline, the rotating disc is rotatably arranged in the support table, the outer wall of the rotating disc is rotatably connected with the belt, and the output shaft of the rotating disc is inserted into the support sleeve; the support sleeve is connected with the inner wall of the gas pipeline and points to the axis of the gas pipeline, and the outer wall of the support sleeve is further connected with a support frame, the other end of the support frame is provided with an axis sleeve, and the axis sleeve is sleeved on the rotating shaft; the steering part includes a steering shaft and a connecting disc, one end of the connecting disc is connected with the steering shaft, the other end of the connecting disc is provided with a protrusion, and the protrusion slides in the back-shaped sliding block; the gas pipeline is further provided with a sliding sleeve on the inner wall between the steering part and the inner wall absorbing cover, and the push rod slides in the sliding sleeve.

[0021] The beneficial effects of the present application are as follows:

[0022] The filter unit arranged in the conveying unit filters out the impurities such as coal residue and water vapor in the gas, realizes the purpose of collecting relatively clean gas, avoids the impurities entering the gas pump, affects the equipment operation, and also reduces the operation steps of secondary purification to a certain extent. The collecting unit can be opened when the gas pump is working normally, and the conveying unit is sealed synchronously to avoid gas leakage. The burner can adopt corresponding types of burners according to different concentrations of extracted gas, such as porous medium burners, internal combustion engines and MLID burners, and has a wide range of applications. The condenser can use different types (water-cooled, air-cooled or evaporative), which can be selected according to different positions; the steam after work adopts a recycling mode, which effectively saves water resources. The inorganic salt solution can adopt various types, such as sodium carbonate and potassium carbonate solution, which can be selected according to actual conditions; injecting it into the coal seam effectively improves the permeability of the coal seam. The exhaust gas of the burner is treated and changed into carbon dioxide and injected into the coal seam, the carbon dioxide replaces the gas and is stored in the coal seam, drives the coal seam gas and promotes the gas extraction, the released gas is used for power generation, reduces the gas emission to the atmosphere and the loss in the transportation process, reduces the risk of gas disaster, and forms a good closed-loop emission reduction work. The present application realizes multi-stage utilization of the waste heat of the burner for power generation, preheating of gas, heating and water supply for personnel. It has high energy utilization efficiency. The present application realizes multi-stage utilization of electric energy, and the generated electric energy is mainly used for temporary refuge chamber, lighting lamp and other electric equipment in the well, and is transmitted to the power grid through the auxiliary shaft. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments description will be briefly introduced as follows. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can be obtained from these drawings without paying creative labor, and the present application is not limited to the specific embodiments disclosed below.

[0024] Figure 1 The basic flowchart of the underground gas efficient utilization and gas extraction integrated system and method of the present application.

[0025] Figure 2 The system schematic diagram of the underground gas efficient utilization and gas extraction integrated system and method of the present application.

[0026] Figure 3 The overall structure schematic diagram of the coal cinder and water vapor filtering device in the gas.

[0027] Figure 4 The gas pipeline cross-sectional view of the coal cinder and water vapor filtering device in the gas.

[0028] Figure 5 The sealing plate structure schematic diagram of the coal cinder and water vapor filtering device in the gas.

[0029] Figure 6 The collection box structure schematic diagram of the coal cinder and water vapor filtering device in the gas.

[0030] Figure 7 The local structure schematic diagram of the coal cinder and water vapor filtering device in the gas.

[0031] Figure 8 The connection shell structure schematic diagram of the coal cinder and water vapor filtering device in the gas. DETAILED DESCRIPTION

[0032] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the drawings.

[0033] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application, but the present application can also be implemented in other ways different from those described herein, and those skilled in the art can make similar generalizations without departing from the connotation of the present application, therefore the present application is not limited to the specific embodiments disclosed below.

[0034] Secondly, the "one embodiment" or "an embodiment" referred to herein means a specific feature, structure, characteristic, or combination of features and / or characteristics described herein that can be included in at least one implementation of the present application. The various appearances of "in one embodiment" or "an embodiment" in the specification do not all refer to the same embodiment, although they can.

[0035] Thirdly, the present application is described in detail in combination with the schematic diagram. In the detailed description of the embodiments of the present application, the sectional view of the device structure is locally enlarged without the general proportion for the convenience of description, and the schematic diagram is only an example, which should not limit the scope of protection of the present application. In addition, the three-dimensional spatial dimensions of length, width and depth should be included in actual production.

[0036] Embodiment 1

[0037] Reference Figure 1 For one embodiment of the present application, the embodiment provides an efficient utilization of underground gas and gas extraction integrated method, as shown in Figure 1 , comprising the following steps:

[0038] S1: introduce a certain amount of air and gas mixture to start the burner;

[0039] S2: part of the high-temperature flue gas is transported to the steam turbine for power generation;

[0040] S3: part of the flue gas is converted into carbon dioxide, and the carbon dioxide and inorganic salt solution are injected into the coal seam at the same time;

[0041] S4: displace the gas and promote the gas extraction, and the extracted gas is used for combustion to form a closed-loop emission reduction mode.

[0042] The above is a schematic scheme of the efficient utilization of underground gas and gas extraction integrated method of the embodiment. It should be noted that the technical scheme of the efficient utilization of underground gas and gas extraction integrated system belongs to the same concept as the technical scheme of the efficient utilization of underground gas and gas extraction integrated method described above. The technical scheme of the efficient utilization of underground gas and gas extraction integrated system in the embodiment is not described in detail, and the description of the technical scheme of the efficient utilization of underground gas and gas extraction integrated method can be referred to.

[0043] Figure 2 is a structural schematic diagram of an efficient utilization of underground gas and gas extraction integrated system provided by the present application. The embodiment can be applied to the case of the efficient utilization of underground gas and gas extraction integrated method.

[0044] Referring to Figure 2 , the efficient utilization of underground gas and gas extraction integrated system in the embodiment comprises:

[0045] The underground gas power generation system, the heat injection system, the liquid injection system, the gas extraction system, the underground power supply system and the independent ventilation system.

[0046] The air supply system in the gas power generation system and the coal mine gas supply system are connected with the gas mixing chamber 3 through the air inlet pipe 2 and the extraction pipe 22 respectively; the ports of the burner are connected with the waste heat boiler 10, the water storage tank 12 and the circulating water treatment system through pipelines respectively; the circulating water treatment system comprises the waste heat boiler 10, the steam turbine 9 connected with the waste heat boiler 10, the condenser 11 and the water storage tank 12.

[0047] Specifically, the heat injection system comprises a plurality of gas injection holes 27 punched into the coal seam 26 from the well 23, and all the gas injection holes 27 are connected with the discharge end of the gas treatment chamber 13 through the gas injection pipe 21 and the No. 1 booster pump 20.

[0048] The gas extraction system comprises a plurality of extraction holes 28 punched into the coal seam 26 from the well 23, and all the extraction holes 28 are connected with the front end of the gas mixing chamber 3 through the extraction pipe 22 and the gas extraction pump 19.

[0049] Specifically, the liquid injection system comprises a plurality of liquid injection holes 41 punched into the coal seam 26 from the well, and all the liquid injection holes 41 are connected with the inorganic salt solution storage tank 38 through the liquid injection pipe 40 and the No. 2 booster pump 39.

[0050] The underground power supply system comprises the electric energy generated by the steam turbine 9 and transmitted to the temporary refuge chamber 17, the lighting lamp 34, the other electric equipment 14 and the power grid 30 through the power transmission line.

[0051] The independent ventilation system comprises the air inlet fan 33 and the air return fan 35.

[0052] The air inlet 32 and the air return 37 of the ventilation system are located on the two sides of the coal mine respectively, the surface air is delivered into the air inlet 32 by the air inlet fan 33, the mine 18 is ventilated with appropriate air volume, and the ventilated air flows into the air return 37, and the ventilated air is extracted by the air return fan 35.

[0053] The liquid injection pipe 40 is made of a material that can resist high temperature and corrosion.

[0054] The power generation chamber 1 and the temporary refuge chamber 17 are both provided with a super strong anti-overpressure thickened steel explosion-proof door and a pressure-resistant, high-temperature-resistant and explosion-proof protective sealed wall.

[0055] It should be noted that, because calcite can fill in the cracks of the coal seam and reduce the permeability of the coal seam, the main component of calcite is calcium carbonate, and the addition of the inorganic salt solution can dissolve the calcium carbonate and improve the permeability of the coal seam, so the index is a decisive index.

[0056] Example 2

[0057] Reference Figure 1 and 2 For an embodiment of the present application, an efficient utilization of underground gas and gas extraction integrated method and system are provided. In order to verify its beneficial effects, the scientific demonstration is carried out through specific implementation and implementation effect.

[0058] The embodiment is as follows:

[0059] Step 1, before starting work, open the ventilation system, and through the air inlet fan 33, the surface air is delivered to the air inlet 32 in positive pressure, and the mine 18 is ventilated with appropriate air volume. The air after ventilation flows into the air return 37, and the air return fan 35 is used to extract the air after ventilation in negative pressure.

[0060] Step 2, during work, a certain amount of air / gas mixture is introduced into the combustor to carry out oxidation combustion reaction, and the high-temperature flue gas generated by the combustor is delivered to the waste heat boiler 10 and the water storage tank 12.

[0061] Step 3, the waste heat boiler 10 extracts the waste heat after combustion to generate steam, part of which is delivered to the heating pipe sleeve 4 to preheat the air / gas mixture before entering the combustor. Part of the steam is delivered to the steam turbine 9 for power generation. The power generation chamber 1 is provided with an ultra-strong anti-overpressure thickened steel explosion-proof door and a pressure-resistant, high-temperature-resistant and explosion-proof protective sealed wall. The steam after work returns to the waste heat boiler 10 and the water storage tank 12 through the condenser 11 for recycling; the condenser 11 uses corresponding types according to different actual conditions, such as water-cooled, air-cooled or evaporative condenser, etc. The generated electric energy is mainly used for the temporary refuge chamber 17, the lighting lamp 34 and other electrical equipment 14 through the power transmission line, and is transmitted to the power grid 30 through the auxiliary shaft 31. The temporary refuge chamber is used for personnel in danger to quickly hide in it when an emergency occurs and wait for external rescue. The chamber is provided with an ultra-strong anti-overpressure thickened steel explosion-proof door and a pressure-resistant, high-temperature-resistant and explosion-proof protective sealed wall, and also provides oxygen, food, water, first aid kit and other facilities necessary for survival; the lighting lamp is used for underground lighting; the other electrical equipment includes coal mining machine, excavator, rail car and various transporters, etc.

[0062] Step 4, the high-temperature flue gas after the waste heat boiler 10 loses part of the heat to become medium-temperature flue gas, which enters the water storage tank 12 to generate hot water. The hot water is delivered to the water distributor 16 to supply water and heat for the temporary refuge chamber 17.

[0063] Step 5, the medium-temperature flue gas in the water storage tank 12 loses part of the heat to become low-temperature flue gas, which enters the gas treatment chamber 13. The carbon dioxide generated in the gas treatment chamber 13 is pressurized by the No. 1 booster pump 20 and injected into the coal seam 26 through the injection hole 27 of the coal seam 26 from the well 23 through the injection pipe 21. The carbon dioxide replaces the gas and is sealed in the coal seam 26.

[0064] Step 6, the inorganic salt solution in the inorganic salt solution storage tank 38 is pressurized by the No. 2 booster pump 39, and is injected into the coal seam 26 through the injection pipe 40 from the injection hole 41 in the coal seam 26. Under the action of the common ion reaction, the calcium carbonate will dissolve in the inorganic salt solution. The water and gas generated in the dissolution process and the released heat promote the desorption of the coal seam and convert the adsorbed gas into free state. The inorganic salt solution uses sodium carbonate, potassium carbonate and ammonium hydroxide solution; the injection pipe 40 is made of materials that can withstand high temperature and corrosion.

[0065] Step 7, the flue gas and the inorganic salt solution jointly displace the gas and promote its extraction. The coal mine gas extracted by the gas extraction pump 19 is sent into the gas mixing chamber 3 through the extraction pipe 22 and is mixed with the air transmitted through the air inlet pipe 2. According to the extraction concentration of different gases measured by the gas concentration detector 29, the appropriate type of burner is selected for combustion, such as the porous medium burner 5, the internal combustion engine 6 and the MLID burner 7, so as to form a closed-loop emission reduction mode.

[0066] Embodiment 3

[0067] Reference Figure 3 For the third embodiment of the present application, which is different from the second embodiment, a gas coal slag and water vapor filtering device is provided: the device comprises a conveying unit 100, including a gas conveying pipe 101 and an auxiliary pipe 102 connected to one side of the gas conveying pipe 101; the outlet of the gas conveying pipe 101 is connected with the gas extraction pump, and the inlet is connected with the gas extraction pipe, so as to fix the device at the inlet of the gas extraction pump; a filtering unit 200, including a filter cover 201 and an absorption cover 202 arranged in the gas conveying pipe 101 in sequence, and the preferred filter cover 201 of the present embodiment is provided with two groups, and the absorption cover 202 is provided with one group, and the two groups of filter covers 201 can effectively reduce the escape rate of coal slag; and a collecting unit 300, including a sealing plate 301 and a collecting box 302, the sealing plate 301 is inserted into the vertical side wall of the auxiliary pipe 102 in a matched manner, and the collecting box 302 is arranged at the bottom end of the sealing plate 301 and can close the opening of the auxiliary pipe 102.

[0068] In the use process, the collecting box 302 is inserted below the auxiliary pipe 102, and the internal impurities are poured out according to the set time of extraction. In the extraction process, the sealing plate 301 will block the opening of the auxiliary pipe 102 to avoid the leakage of gas in the gas conveying pipe 101. When the collecting box 302 is reinserted into the auxiliary pipe 102, the sealing plate 301 will reset to expose the opening, so that the coal slag falls into the collecting box 302.

[0069] The driving assembly 400 comprises a driving motor 401, a driven part 402, a belt 403 and a turning part 404. The driven part 402 is provided with a plurality of groups, the output shaft of the driving motor 401 is connected with the driven part 402, the output shaft of the driven part 402 is engagedly connected with the filtering unit 200, the belt 403 is sleeved on the driven part 402, one end of the turning part 404 is connected with the driven part 402 through the belt 403, and the other end is movably connected with the absorption cover 202.

[0070] The rest of the structure is the same as that of the structure of the embodiment 2.

[0071] In use, the driving motor 401 is started in time to drive the driven part 402 to rotate, thereby driving the internal structure of the filtering cover 201 to move, so as to scrape off the residual coal dregs. Under the driving of the belt 403, the turning part 404 will also rotate, thereby extruding the water-absorbing material in the absorption cover 202 to discharge water and reduce the saturation of the water-absorbing material.

[0072] Embodiment 4

[0073] Reference Figures 3-8 For the fourth embodiment of the present application, the difference from the third embodiment is that it further comprises: the gas conveying pipeline 101 is provided with an input port 101a and an output port 101b at two ends, and the side wall of the gas conveying pipeline 101 is provided with a lower leakage hole 101c for discharging coal dregs or water vapor downward; the input port 101a is provided with a conical converging part 101a-1 facing the inside of the pipeline for concentrating and spraying the entering gas into the filtering cover 201; the auxiliary pipeline 102 comprises a slope section pipeline 102a and a vertical section pipeline 102b, one end of the slope section pipeline 102a with a larger size is connected with the lower leakage hole 101c, and the other end is connected with the vertical section pipeline 102b.

[0074] The filter cover 201 comprises a fixed shell 201a, a filter shell 201b, a rotating shell 201c and a leak-proof baffle 201d; the fixed shell 201a is connected with the inner wall of the gas conveying pipeline 101, and the outer wall is open; the filter shell 201b is a semispherical structure, and the circular edge is connected with the fixed shell 201a; the filter shell 201b is uniformly provided with filter holes 201b-1, and the hole diameter of the filter holes 201b-1 meets the dust filtering requirement; the rotating shell 201c comprises a shell body 201c-1, and the shell body 201c-1 is also a semispherical structure; the spherical structure mainly has a converging effect and can also buffer the impact force of gas; the spherical outer wall size of the shell body 201c-1 is the same as the inner wall size of the filter shell 201b, and the shaft centers are located on the same straight line; the shell body 201c-1 is also uniformly provided with adjusting holes 201c-1a, and the hole diameter of the adjusting holes 201c-1a is greater than that of the filter holes 201b-1; the shell body 201c-1 is also provided with a rotating shaft 201c-2 on the shaft line, and the first conical gear groove 201c-2a is formed in the end of the rotating shaft 201c-2 away from the shell body 201c-1; the leak-proof baffle 201d is connected with the opening of the fixed shell 201a, and the end away from the fixed shell 201a is provided with a slope, which is parallel to the slope of the slope section pipeline 102a.

[0075] The absorbing cover 202 is arranged on the inner wall of the gas conveying pipeline 101 close to the output port 101b, and comprises a connecting shell 202a, a water absorbing cotton 202b and a pressing piece 202c; the inner wall of the connecting shell 202a is provided with a pressing boss 202a-1, the middle part of the pressing boss 202a-1 is open, and the water absorbing zone A1 is formed in the connecting shell 202a, and the water absorbing cotton 202b is placed in the water absorbing zone A1; the pressing piece 202c is arranged at the opening of the end of the connecting shell 202a with the water absorbing zone A1, the outer diameter of the pressing piece 202c is equal to the inner diameter of the connecting shell 202a, the middle part of the pressing piece 202c is open, and the end away from the connecting shell 202a is also connected with a push rod 202c-1, and the other end of the push rod 202c-1 is connected with a back-shaped sliding block 202c-2.

[0076] The outer wall of one side of the vertical section pipeline 102b is provided with a placing protrusion 102b-1, and the outer wall of the other side is provided with a limiting protrusion 102b-2. The top end of the placing protrusion 102b-1 is connected with the slope side wall of the slope section pipeline 102a. The placing protrusion 102b-1 is internally provided with a placing layer B1. The placing layer B1 is in turn transversely connected with the placing protrusion 102b-1, the vertical section pipeline 102b and the limiting protrusion 102b-2. The sealing plate 301 is slidingly arranged in the placing layer B1. When the sealing plate 301 normally plugs and seals the opening of the vertical section pipeline 102b, one end of the sealing plate 301 is clamped in the limiting protrusion 102b-2, and the other end still stays in the placing protrusion 102b-1, and both sides are clamped in the side wall of the vertical section pipeline 102b, thereby ensuring the sealing property. The two ends of the sealing plate 301, which are parallel to the axis of the gas conveying pipeline 101, are provided with moving plates 301a. The moving plates 301a are uniformly provided with clamping holes 301a-1. The end of the placing protrusion 102b-1, which is away from the slope section pipeline 102a, is symmetrically provided with gear grooves 102b-1a. The gear grooves 102b-1a correspond to the moving plates 301a. A plurality of groups of gears C1 are symmetrically and rotatably arranged in the gear grooves 102b-1a. The gears C1 are in meshing connection with the clamping holes 301a-1. The collecting box 302 includes a box body 302a and a contact block 302b. The contact block 302b is symmetrically arranged at the top end of the box body 302a. The contact block 302b is in meshing connection with the gears C1. The contact block 302b is in meshing connection with the gears C1 from below, so that the gears C1 rotate, thereby driving the moving plates 301a to move, and realizing the horizontal movement of the sealing plate 301.

[0077] The driven part 402 is correspondingly arranged with the filter cover 201, and includes a rotating disc 402a, a support table 402b and a support sleeve 402c. The support table 402b is fixedly connected to the outer wall of the gas conveying pipeline 101. The rotating disc 402a is rotatably arranged in the support table 402b. The outer wall of the rotating disc 402a is in rotational connection with the belt 403. The output shaft of the rotating disc 402a is plugged into the support sleeve 402c. The support sleeve 402c is connected to the inner wall of the gas conveying pipeline 101. The support sleeve 402c is directed to the axis of the gas conveying pipeline 101. The outer wall of the support sleeve 402c is further connected with a support frame 402c-1. The other end of the support frame 402c-1 is provided with an axis sleeve 402c-1a, which is sleeved on the rotating shaft 201c-2.

[0078] The turning part 404 includes a turning shaft 404a and a connecting disc 404b. One end of the connecting disc 404b is connected with the turning shaft 404a. The other end edge of the connecting disc 404b is provided with a protrusion 404b-1, which slides in the back-shaped sliding block 202c-2. The gas conveying pipeline 101 is further provided with a sliding sleeve 101d on the inner wall between the turning part 404 and the inner wall absorbing cover 202. The push rod 202c-1 slides in the sliding sleeve 101d.

[0079] The remaining structure is the same as that of example 3.

[0080] With reference to Figure 1 and 2 In use, the driving assembly 400 drives the driven member 402 to rotate. When the first bevel gear groove 201c-2a is engaged with the output shaft bevel gear of the driven member 402, the rotating shell 201c rotates to scrape off the coal residue remaining on the fixed shell 201a through the aperture, effectively ensuring the cleanliness of the fixed shell 201a. A brush structure can be arranged on the outer wall of the rotating shell 201c in contact with the fixed shell 201a for cleaning the filter hole 201b-1.

[0081] Further, the turning member 404 also rotates due to the driving of the belt 403. The turning shaft 404a drives the connecting disc 404b to rotate, and the protrusion 404b-1 on the connecting disc 404b is in the back-shaped sliding block 202c-2. The push rod 202c-1 slides in the sliding sleeve 101d and is limited by the sliding sleeve 101d. Therefore, the entire extruding member 202c reciprocates along the axis direction of the gas conveying pipeline 101 to extrude the water-absorbing cotton 202b to discharge the internal moisture.

[0082] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application but not limit the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced equivalently without departing from the spirit and scope of the present application, and all of them should be covered in the scope of the claims of the present application.

Claims

1. An integrated system for efficient underground gas utilization and gas extraction, characterized in that: include: Underground gas power generation system, heat injection system, liquid injection system, gas extraction system, underground power supply system and independent ventilation system; Also included is a filtering device, the filtering device comprising, A delivery unit (100) is provided at the inlet of a gas extraction pipeline of a gas extraction system, and comprises a gas delivery pipeline (101) and an auxiliary pipeline (102) connected to one side of the gas delivery pipeline (101); A filter unit (200) comprises a filter cover (201) and an absorption cover (202) which are sequentially arranged in cooperation with each other in the gas transmission pipeline (101), and; The collecting unit (300) comprises a sealing plate (301) and a collecting box (302), wherein the sealing plate (301) is inserted into a vertical side wall of the auxiliary pipe (102), and the collecting box (302) is arranged at the bottom end of the sealing plate (301) and can cooperate to close the opening of the auxiliary pipe (102); A driving assembly (400) comprises a driving motor (401), a driven member (402), a belt (403) and a steering member (404), wherein the driven member (402) is provided in multiple groups, an output shaft of the driving motor (401) is connected to the driven member (402), an output shaft of the driven member (402) is meshedly connected to the filter unit (200), the belt (403) is sleeved on the driven member (402), one end of the steering member (404) is connected to the driven member (402) via the belt (403), and the other end is movably connected to the absorption cover (202).

2. The integrated system for efficient underground gas utilization and gas extraction according to claim 1, characterized in that: The air supply system and the coal mine gas supply system in the gas power generation system are connected to the gas mixing chamber (3) through an air inlet pipe (2) and an extraction pipe (22), respectively; the burner port is connected to the waste heat boiler (10), a water storage tank (12), and a circulating water treatment system through pipelines; the circulating water treatment system includes a waste heat boiler (10), a steam turbine (9) connected to the waste heat boiler (10), a condenser (11), and a water storage tank (12); The heat injection system includes a plurality of gas injection holes (27) drilled into the coal seam (26) from a well (23), and all the gas injection holes (27) are connected to the discharge end of the gas treatment chamber (13) through a gas injection pipe (21) and a No. 1 booster pump (20); The gas extraction system includes a plurality of extraction holes (28) drilled from a well (23) into a coal seam (26), and all the extraction holes (28) are connected to the front end of the gas mixing chamber (3) through an extraction pipe (22) and a gas extraction pump (19); The injection system includes a plurality of injection holes (41) drilled into the coal seam (26) from a well, and all the injection holes (41) are connected to the inorganic salt solution storage tank (38) through an injection pipe (40) and a No. 2 booster pump (39).

3. The integrated system for efficient underground gas utilization and gas extraction according to claim 2, characterized in that: The underground power supply system includes a steam turbine (9) that generates electric energy and transmits it to a temporary refuge chamber (17), a lighting lamp (34), other electrical equipment (14), and a power grid (30) through a transmission line; The independent ventilation system includes an air inlet fan (33) and a return air fan (35); The air inlet (32) and the return air outlet (37) of the ventilation system are respectively located on both sides of the coal mine. The positive pressure of the surface air is transported to the air inlet (32) through the air inlet fan (33), and the mine (18) is ventilated with a suitable air volume. The ventilated air flows into the return air outlet (37) and is extracted under negative pressure through the return air fan (35); The injection pipe (40) is made of a material that is resistant to high temperatures and corrosion; The power generation room (1) and the temporary refuge chamber (17) are both equipped with thickened steel explosion-proof doors with super strong overpressure resistance and protective closed walls that are pressure-resistant, high-temperature-resistant and explosion-proof.

4. The integrated system for efficient underground gas utilization and gas extraction according to claim 1 is characterized in that: The gas transmission pipeline (101) has two openings at both ends, namely an input port (101a) and an output port (101b), and a lower leakage hole (101c) is provided on the side wall of the gas transmission pipeline (101); The input port (101a) is provided with a tapered polymer component (101a-1) facing the interior of the pipeline; The auxiliary pipeline (102) comprises a slope section pipeline (102a) and a vertical section pipeline (102b); the larger end of the slope section pipeline (102a) is connected to the lower leakage hole (101c), and the other end is connected to the vertical section pipeline (102b).

5. The underground gas efficient utilization and gas extraction integrated system according to claim 1 is characterized in that: The filter housing (201) comprises a fixed shell (201a), a filter shell (201b), a rotating shell (201c) and a leak-proof baffle (201d); The fixed shell (201a) is cooperatively connected to the inner wall of the gas transmission pipeline (101), and its outer wall is open. The filter shell (201b) is a hemispherical structure, with a rounded edge connected to the fixed shell (201a). The filter shell (201b) is evenly provided with filter holes (201b-1); The rotating shell (201c) comprises a shell (201c-1), the shell (201c-1) also having a hemispherical structure, the spherical outer wall having the same dimensions as the inner wall of the filtering shell (201b), and the axis being located on the same straight line; the shell (201c-1) is also evenly provided with adjustment holes (201c-1a), the diameter of the adjustment holes (201c-1a) being larger than the filter holes (201b-1); A rotating shaft (201c-2) is also provided on the axis of the housing (201c-1); a first bevel gear groove (201c-2a) is provided at one end of the rotating shaft (201c-2) away from the housing (201c-1); the first bevel gear groove (201c-2a) is connected to the top end of the output shaft of the driven member (402); The anti-leakage baffle (201d) is connected to the opening of the fixed shell (201a), and an end thereof away from the fixed shell (201a) is provided with an inclined surface, which is parallel to the inclined surface of the slope section pipeline (102a).

6. The underground gas efficient utilization and gas extraction integrated system according to claim 4 is characterized by: The absorption cover (202) is arranged on the inner wall of the gas transmission pipeline (101) near the output port (101b), and comprises a connecting shell (202a), absorbent cotton (202b) and an extrusion piece (202c); The inner wall of the connecting shell (202a) is provided with an extrusion boss (202a-1), the middle portion of the extrusion boss (202a-1) is open, and together with the connecting shell (202a) forms a water squeezing area (A1), and the absorbent cotton (202b) is cooperatively placed in the water squeezing area (A1); The extrusion piece (202c) is arranged in cooperation with an opening at one end of the connection shell (202a) having a water squeezing area (A1), and its outer diameter is equal to the inner diameter of the connection shell (202a). The middle of the extrusion piece (202c) is open, and the end away from the connection shell (202a) is also connected to a push rod (202c-1), and the other end of the push rod (202c-1) is connected to a circular slider (202c-2).

7. The integrated system for efficient underground gas utilization and gas extraction according to claim 6 is characterized in that: A placement protrusion (102b-1) is provided on one outer wall of the vertical section pipe (102b), and a limiting protrusion (102b-2) is provided on the other outer wall; the top end of the placement protrusion (102b-1) is connected to the slope side wall of the slope section pipe (102a); A placement layer (B1) is provided inside the placement protrusion (102b-1), the placement layer (B1) sequentially and laterally connects the placement protrusion (102b-1), the vertical section pipe (102b) and the limiting protrusion (102b-2), and the sealing plate (301) is slidably arranged in the placement layer (B1); The sealing plate (301) is provided with movable plates (301a) at both ends parallel to the axis of the gas transmission pipeline (101), and the movable plates (301a) are evenly provided with snap-fit ​​holes (301a-1); A gear groove (102b-1a) is symmetrically provided at one end of the placement protrusion (102b-1) away from the slope section pipe (102a), the gear groove (102b-1a) corresponding to the movable plate (301a), and a plurality of sets of gears (C1) are symmetrically arranged therein for rotation, the gears (C1) being meshed and connected with the engaging holes (301a-1); The collection box (302) comprises a box body (302a) and a contact block (302b), wherein the contact block (302b) is symmetrically arranged at the top end of the box body (302a), and the contact block (302b) is meshedly connected with a gear (C1).

8. The integrated system for efficient underground gas utilization and gas extraction according to claim 7 is characterized in that: The driven member (402) is arranged corresponding to the filter cover (201), and comprises a turntable (402a), a support platform (402b) and a support sleeve (402c); the support platform (402b) is fixedly connected to the outer wall of the gas transmission pipeline (101); the turntable (402a) is rotatably arranged inside the support platform (402b); the outer wall of the turntable is rotatably connected to the belt (403); and the output shaft of the turntable (402a) is inserted into the support sleeve (402c); The support sleeve (402c) is connected to the inner wall of the gas pipeline (101) and points toward the axis of the gas pipeline (101). The outer wall of the support sleeve (402c) is also connected to a support frame (402c-1). The other end of the support frame (402c-1) is provided with an axis sleeve (402c-1a), and the axis sleeve (402c-1a) is sleeved on the rotating shaft (201c-2). The steering member (404) comprises a steering shaft (404a) and a connecting disk (404b); the middle portion of one end of the connecting disk (404b) is connected to the steering shaft (404a); the edge of the other end is provided with a protrusion (404b-1); the protrusion (404b-1) slides in the circular slider (202c-2); The gas transmission pipeline (101) is further provided with a sliding sleeve (101d) on the inner wall between the steering member (404) and the absorption cover (202), and the push rod (202c-1) slides in the sliding sleeve (101d).

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