Closed water circulation gas extraction system with gas purification function

Abstract

The invention belongs to the technical field of gas extraction, particularly relates to a closed water circulation gas extraction system with a gas purification function, and provides the following scheme aiming at the technical problems of water resource waste, large equipment occupied area and high maintenance cost caused by a traditional gas extraction system. The system comprises a gas-water separation device, a three-stage separation device and a gas extraction closed water circulation device, the gas-water separation device, the three-stage separation device and the gas extraction closed water circulation device are fixed to the top of the same common base, the three-stage separation device comprises a separation machine box, and a cyclone separation cylinder is arranged at the top of the separation machine box. According to the closed water circulation gas extraction system with the gas purification function, a three-stage separation device is arranged at the front end of the water ring type vacuum pump to purify gas, 99% or above of impurities are filtered and adsorbed, the purified gas is free of solid impurities, the problems that in a traditional system, a pump body is abraded due to impurity deposition, and parts are scaled are thoroughly solved, and the service life of the system is prolonged. The service life of the water-ring vacuum pump is greatly prolonged, and the maintenance and replacement cost of equipment is reduced.

Description

Technical Field

[0001] This invention relates to the field of gas extraction technology, and in particular to a closed-loop water-circulating gas extraction system with gas purification function. Background Technology

[0002] Coal mine surface gas extraction pumping stations are the core equipment for coal mine gas extraction and resource utilization. The core operating component of traditional surface gas extraction pumping stations is the water ring vacuum pump. Its conventional operating mode is as follows: the water ring vacuum pump extracts gas from underground coal mine to the surface through the negative pressure gas pipeline. The extracted gas is first separated into gas and liquid by a gas-liquid separator. The separated gas is either directly discharged into the air or transported to gas power generation equipment for resource utilization. The separated water containing impurities such as coal slime and dust is discharged to a hot water tank. After sedimentation in the hot water tank, the upper layer of water is pumped to a cooling tower for cooling by a hot water pump. The cooled water flows into a cold water tank, and then the cold water is pumped into the water ring vacuum pump by a cold water pump to achieve water recycling. The coal slime settled in the hot water tank needs to be manually cleaned at regular intervals.

[0003] Traditional gas extraction systems suffer from numerous technical defects during actual operation. Specifically, the gas extracted from underground mines contains a large amount of coal dust, particulate matter, water vapor, and slag, among other impurities. When this unfiltered gas enters the water ring vacuum pump directly, the impurities accumulate inside the pump, causing scaling and wear on internal components, significantly reducing the pump's lifespan. Furthermore, traditional open-loop water circulation systems require multiple supporting facilities such as hot water tanks, cold water tanks, and cooling towers. The entire gas extraction pumping station is geographically dispersed, has a large system footprint, occupies significant amounts of land, and has high construction costs. Existing technologies struggle to address these issues. Therefore, a closed-loop water circulation gas extraction system with gas purification capabilities is urgently needed to solve these problems. Summary of the Invention

[0004] To address the technical problems of water waste, large equipment footprint, and high maintenance costs associated with traditional gas extraction systems, this invention proposes a closed-loop water-circulating gas extraction system with gas purification function.

[0005] The present invention proposes a closed-loop water-circulating gas extraction system with gas purification function. The system includes a gas-liquid separator, a three-stage separator, and a closed-loop water-circulating gas extraction device. The gas-liquid separator, the three-stage separator, and the closed-loop water-circulating gas extraction device are installed in the same gas extraction system. The three-stage separation device includes a separator housing, a cyclone separator cylinder at the top of the separator housing, an air inlet at the top of the cyclone separator cylinder, a centrifugal separation device in the middle of the separator housing, a filter cartridge separator cylinder at one end of the separator housing, and an exhaust port at the bottom of one end of the separator housing. The gas extraction closed-loop water circulation device includes a horizontally installed water ring vacuum pump, the top input position of which is connected to the exhaust port of the three-stage separation device. The gas-water separation device includes a vertically installed gas-water separation tank. The bottom of the gas-water separation tank is connected to the same liquid supply pipeline as the water ring vacuum pump. The top of the gas-water separation tank is connected to the top output position of the water ring vacuum pump.

[0006] Preferably, the system further includes a drive unit for driving the operation of the closed-loop water circulation device for gas extraction. The drive unit includes a motor, a coupling, and a reducer mounted on the top of a common base. The output shaft of the motor is connected to the coupling and the reducer via a rotating shaft. The output shaft of the reducer is connected to the rotating shaft of the water ring vacuum pump.

[0007] Preferably, there are three filter cartridge separators arranged in a linear array, with the top of the filter cartridge separator being the air inlet and the bottom of the filter cartridge separator being the air outlet.

[0008] Preferably, a level gauge is installed on the side wall of the gas-water separator, a pressure gauge is installed on the top of the gas-water separator, and an air outlet pipe is provided on the top of the gas-water separator.

[0009] Preferably, a horizontal circulating cooler is installed in the middle of the liquid supply pipeline at the bottom of the gas-liquid separator and the water ring vacuum pump.

[0010] Preferably, the system also includes a sewage discharge device, which includes a sewage pump fixed to the top of a common base and a water seal tank fixed to the top of the common base. The water seal tank is located at the bottom of the three-stage separation device. A sewage discharge pipe is installed at the bottom of the separator box of the three-stage separation device, and the bottom of the sewage discharge pipe is connected to the water seal tank.

[0011] Preferably, the centrifugal separation device includes two separation chambers, each with a drain chamber inside. Two symmetrically distributed centrifugal separation rollers are mounted on the top of the drain chamber via bearings. Gear rings are fixed to the outer circumference of the centrifugal separation rollers. A drain trough is provided on the bottom side wall of the separation chamber.

[0012] Preferably, a drive motor is installed inside the separation box, the toothed rings on the outer walls of the two centrifugal separation rollers mesh with each other, and a drive gear is fixed on the output shaft of the drive motor, the drive gear meshing with one of the toothed rings.

[0013] Preferably, centrifugal blades are installed on the inner circumference of the centrifugal separating roller, and centrifugal blade shafts are installed on the centrifugal blades. The centrifugal blade shafts are controlled to rotate by a servo motor, which is installed inside the centrifugal separating roller.

[0014] Preferably, the inner circumferential wall of the centrifugal separating roller is configured as a through groove structure, and a sheet filter element is placed in the through groove at the circumferential position of the centrifugal separating roller.

[0015] The beneficial effects of this invention are as follows: This closed-loop water-circulating gas extraction system with gas purification function has a three-stage separation device at the front end of the water ring vacuum pump to purify the gas, achieving more than 99% impurity filtration and adsorption. The purified gas is free of solid impurities, which completely solves the problem of impurity accumulation and pump wear in traditional systems, leading to scaling of parts. It greatly improves the service life of the water ring vacuum pump and reduces the maintenance and replacement costs of the equipment. This closed-loop water circulation gas extraction system with gas purification function eliminates the traditional open-loop water circulation system with hot water tank, cold water tank and cooling tower. It is designed with a gas-water separation unit and a water ring vacuum pump in a closed-loop water circulation loop. The circulating water has no natural loss and does not need to be replenished regularly. It has a high water resource utilization rate and reduces the water resource consumption of coal mine gas extraction. This closed-loop water circulation gas extraction system with gas purification function eliminates the need for multiple supporting sedimentation tanks and cooling towers. The three-stage separation device, sewage discharge device and closed-loop water circulation system are integrated into one layout. The equipment structure of the entire extraction system is compact, which greatly reduces the footprint of the ground pump station and lowers the construction cost of the ground pump station. This closed-loop water-circulating gas extraction system with gas purification function is equipped with a sewage discharge device, realizing the automated collection, drying, transportation and slag discharge of coal slime impurities. There is no need for manual regular sludge removal, and there is no accumulation of impurities in the closed water circulation loop. There is no need for regular maintenance of the water circulation equipment, which greatly reduces the amount of manual maintenance work for the entire system and significantly reduces operating costs. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of a closed-loop water-circulating gas extraction system with gas purification function proposed in this invention. Figure 2 This is a side view of the overall structure of a closed-loop water-circulating gas extraction system with gas purification function proposed in this invention. Figure 3 This is a top view schematic diagram of the overall structure of a closed-loop water-circulating gas extraction system with gas purification function proposed in this invention. Figure 4 This is a partial structural diagram of a three-stage separation device in a closed-loop water-circulating gas extraction system with gas purification function proposed in this invention. Figure 5 This is a cross-sectional schematic diagram of the three-stage separation device of a closed-loop water-circulating gas extraction system with gas purification function proposed in this invention. Figure 6This is a schematic diagram of the centrifugal separation roller structure of a closed-loop water-circulating gas extraction system with gas purification function proposed in this invention. Figure 7 This is a partial structural diagram of the centrifugal separation roller of a closed-loop water-circulating gas extraction system with gas purification function proposed in this invention.

[0017] In the picture: 100. Gas-liquid separator; 101. Gas-liquid separator tank; 102. Level gauge; 103. Pressure gauge; 104. Gas outlet pipe; 105. Horizontal circulating cooler; 200. Drive unit; 201. Motor; 202. Coupling; 203. Reducer; 300. Three-stage separation device; 301. Cyclone separator; 302. Cyclone separator air inlet; 303. Blade separator; 304. Cartridge separator; 305. Exhaust port; 306. Sewage discharge pipe; 400. Sewage discharge device; 401. Sewage pump; 402. Water seal tank; 500. Closed-loop water circulation device for gas extraction; 501. Water ring vacuum pump; 502. Vacuum pump inlet pipe; 503. Liquid supply pipeline; 504. Vacuum pump gas guide pipe; 505; 506; 507; 508; 509; 600. Centrifugal separation device; 601. Sewage discharge chamber; 602. Centrifugal separation roller; 603. Centrifugal blade; 604. Plate filter element; 605. Toothed ring; 606. Sewage discharge trough; 607. Centrifugal blade shaft. Detailed Implementation

[0018] Reference Figures 1-3 A closed-loop water-circulating gas extraction system with gas purification function includes a gas-liquid separator 100, a three-stage separator 300, and a closed-loop water-circulating gas extraction device 500, all of which are installed within the same gas extraction system.

[0019] Reference Figures 1-4 The three-stage separation device 300 is configured in sequence to include a first-stage hydrocyclone separator 302 for solid-liquid separation, a second-stage blade-type separator 303 for gas-water separation, and a third-stage filter cartridge separator 304 for adsorption filtration.

[0020] Reference Figure 4 The three-stage separation device 300 includes a separator box, a cyclone separator 301 on the top of the separator box, an air inlet 302 on the top of the cyclone separator 301, and a stainless steel cyclone separator plate inside the cyclone separator 301. The initial separation of coarse slag and coal dust is achieved through the centrifugal action of the cyclone.

[0021] Reference Figures 4-7 A centrifugal separation device 600 is located in the middle of the separator housing. The centrifugal separation device 600 includes two separation chambers. A drain chamber 601 is provided inside each separation chamber. Two symmetrically distributed centrifugal separation rollers 602 are mounted on the top of the drain chamber 601 via bearings. Gear rings 605 are fixed to the outer circumference of each centrifugal separation roller 602. A drain trough 606 is provided on the bottom side wall of each separation chamber. A drive motor is installed inside each separation chamber. The gear rings 605 on the outer walls of the two centrifugal separation rollers 602 mesh with each other. The output shaft of the drive motor... A drive gear is fixed and meshes with one of the toothed rings 605. Centrifugal blades 603 are installed on the inner circumference of the centrifugal separation roller 602. The inner circumference of the centrifugal separation roller 602 is set as a through groove structure, and a plate filter element 604 is placed in the through groove at the circumference of the centrifugal separation roller 602. The centrifugal blades 603 are high-strength steel centrifugal blades. The secondary separation of fine dust particles is achieved through centrifugal rotation. During the process of conveying gas to one end of the filter cartridge separator 304, the fine dust particles are also centrifugally separated.

[0022] Reference Figure 6 , Figure 7 Centrifugal blades 603 are equipped with centrifugal blade shafts 607, which are controlled to rotate by a servo motor. The servo motor is installed inside the centrifugal separation roller 602. After a long period of use, a large amount of fine particulate dust accumulates on the inner wall of the plate filter element 604. The servo motor controls the deflection of each centrifugal blade 603 to remove the fine particulate dust from the surface of the plate filter element 604. The dust falls into the bottom drain chamber 601 through the airflow and the gaps at both ends, and finally is discharged into the water seal tank 402 through the bottom drain trough 606 and drain pipe 306.

[0023] Reference Figure 4 , Figure 5 The separator also has a cartridge separator 304 at one end. The cartridge separator 304 is filled with a highly adsorbent filter material composed of activated carbon and ceramic filter particles to achieve deep purification of micro-particle dust. The gas impurity filtration efficiency after being treated by the cartridge separator 304 reaches 99.2%. An exhaust port 305 is provided at the bottom of one end of the separator. There are three cartridge separators 304, and the three cartridge separators 304 are arranged in a linear array. The top of the cartridge separator 304 is the air inlet and the bottom of the cartridge separator 304 is the exhaust.

[0024] Gas extraction closed-loop water circulation device 500: includes a horizontally installed water ring vacuum pump 501, the top input position of the water ring vacuum pump 501 is connected to the exhaust port 305 of the three-stage separation device 300.

[0025] Gas-liquid separation device 100: includes a vertically installed gas-liquid separation tank 101. The bottom of the gas-liquid separation tank 101 is connected to the same liquid supply pipeline 503 between it and the water ring vacuum pump 501. The top of the gas-liquid separation tank 101 is connected to the top output position of the water ring vacuum pump 501 to realize gas-liquid separation of gas-liquid mixed gas. The gas outlet pipe 104 of the gas-liquid separation device 100 is connected to the gas outlet pipeline. A concentration monitor is installed on the gas outlet pipeline. When the gas concentration is ≥8%, the gas is transported to the gas power generation equipment. When the gas concentration is <8%, the gas is directly discharged into the air.

[0026] Furthermore, the system also includes a drive unit 200 for driving the operation of the gas extraction closed-loop water circulation device 500. The drive unit 200 includes a motor 201, a coupling 202 and a reducer 203 mounted on the top of a common base. The output shaft of the motor 201 is connected to the coupling 202 and the reducer 203 via a rotating shaft. The output shaft of the reducer 203 is connected to the rotating shaft of the water ring vacuum pump 501.

[0027] Furthermore, a level gauge 102 is installed on the side wall of the gas-water separator 101, a pressure gauge 103 is installed on the top of the gas-water separator 101, and an air outlet pipe 104 is provided on the top of the gas-water separator 101.

[0028] Reference Figures 1-3 Furthermore, a horizontal circulating cooler 105 is installed between the gas-water separator 101 and the liquid supply pipeline 503 at the bottom of the water ring vacuum pump 501. The bottom water outlet of the gas-water separator 100 is sealed to the water inlet of the horizontal water ring vacuum pump 5 through the horizontal circulating cooler 105, forming a closed water circulation loop. Five sets of stainless steel curved cooling pipes are installed in the circulation pipeline to increase the heat exchange area of ​​the water and improve the cooling efficiency by 30% compared with the traditional cooling tower. This closed water circulation structure eliminates the traditional hot water sedimentation tank, cold water tank and cooling tower, and the equipment occupies 60% less space than the traditional system.

[0029] Reference Figures 1-3Furthermore, the system also includes a sewage discharge device 400, which includes a sewage pump 401 fixed to the top of a common base and a water seal tank 402 fixed to the top of the common base. The water seal tank 402 is located at the bottom of the three-stage separation device 300. A sewage discharge pipe 306 is installed at the bottom of the separator box of the three-stage separation device 300. The bottom of the sewage discharge pipe 306 is connected to the water seal tank 402. The sewage discharge device 400 includes the water seal tank 402 and the sewage pump 401. The water seal tank 402 is a sealed concrete structure and is connected to the impurity discharge outlets of the three separation units of the three-stage separation device 300 through sealed pipelines. It is used to collect a mixture of coal slag, coal slime and water, and integrates drying, conveying and slag discharge functions. After the mixture is processed by this device, the moisture content of the coal slime is reduced to below 15%. The dried coal slime is automatically discharged by the screw conveyor mechanism connected to the sewage pump 401. The whole process does not require manual operation.

[0030] After the closed-loop water-circulating gas extraction system with gas purification function in this embodiment is put into use at the coal mine surface gas extraction pumping station, the wear rate of the water ring vacuum pump 501 is reduced by 95%, and the service life is extended from the original 2 years to more than 8 years. The closed-loop water circulation structure has no water resource loss, saving about 120,000 yuan in water replenishment costs every year. The entire system does not require manual dredging and regular water replenishment, reducing manual maintenance costs by 80%. The continuous operation efficiency of gas extraction is increased from the original 85% to 98%, which has significant economic and social benefits.

[0031] When using this invention, the partial steps of the closed-loop gas extraction method are as follows: S1. Gas extraction: The negative pressure generated by the water ring vacuum pump 501 is used to extract the gas from the coal mine to the surface through the negative pressure gas pipeline, and then it is separated and purified by the three-stage separation device 300. S2. Gas purification: The extracted gas enters the three-stage separation device 300, and passes through the cyclone separator 301, the blade separator 303, and the filter cartridge separator 304 in sequence to complete multi-stage impurity removal and obtain purified gas. S3. Automatic slag removal: The mixture of coal slag, coal slurry and water separated by the three-stage separation device 300 flows into the water seal tank 402, and then is automatically transported and discharged by the sewage pump 401. S4. Gas transport and gas-water separation: The purified gas enters the water ring vacuum pump 501, and after being compressed by the pump body, it enters the gas-water separation device 100 to separate the gas from the water. The separated gas is discharged through the gas outlet pipe 104 at the top of the gas-water separation device 100 or sent to the gas power generation equipment. S5. Closed-loop water circulation: The hot water separated by the gas-water separator 100 is transported to the liquid supply pipeline 503 via the horizontal circulating cooler 105. After being cooled down by the pipeline, it is directly returned to the water ring vacuum pump 501 for reuse, thus completing the closed-loop water circulation.

[0032] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A closed-loop water-circulating gas extraction system with gas purification function, the system comprising a gas-liquid separator (100), a three-stage separator (300) and a closed-loop water-circulating gas extraction device (500), wherein the gas-liquid separator (100), the three-stage separator (300) and the closed-loop water-circulating gas extraction device (500) are installed in the same gas extraction system; The three-stage separation device (300) includes a separator housing, a cyclone separator (301) on the top of the separator housing, an air inlet (302) at the top of the cyclone separator (301), a centrifugal separator (600) in the middle of the separator housing, a filter cartridge separator (304) at one end of the separator housing, and an exhaust port (305) at the bottom of one end of the separator housing. The gas extraction closed-loop water circulation device (500) includes a horizontally installed water ring vacuum pump (501), the top input position of which is connected to the exhaust port (305) of the three-stage separation device (300). The gas-water separation device (100) includes a vertically installed gas-water separation tank (101), the bottom of the gas-water separation tank (101) and the water ring vacuum pump (501) are connected by the same liquid supply pipeline (503), and the top of the gas-water separation tank (101) is connected to the top output position of the water ring vacuum pump (501).

2. The closed-loop water-circulating gas extraction system with gas purification function according to claim 1, characterized in that, The system also includes a drive unit (200) for driving the operation of the gas extraction closed-loop water circulation device (500). The drive unit (200) includes a motor (201), a coupling (202) and a reducer (203) mounted on the top of a common base. The output shaft of the motor (201) is connected to the coupling (202) and the reducer (203) via a rotating shaft. The output shaft of the reducer (203) is connected to the rotating shaft of the water ring vacuum pump (501).

3. A closed-loop water-circulating gas extraction system with gas purification function according to claim 1, characterized in that, The filter cartridge separator (304) is provided in three parts, and the three filter cartridge separators (304) are arranged in a linear array. The top of the filter cartridge separator (304) is the air inlet end, and the bottom of the filter cartridge separator (304) is the air outlet end.

4. A closed-loop water-circulating gas extraction system with gas purification function according to claim 1, characterized in that, The gas-liquid separator (101) is equipped with a level gauge (102) on its side wall for monitoring the gas-liquid level in the gas-liquid separator (100). The gas-liquid separator (101) is equipped with a pressure gauge (103) on its top and an outlet pipe (104) on its top.

5. A closed-loop water-circulating gas extraction system with gas purification function according to claim 4, characterized in that, A horizontal circulating cooler (105) is installed between the liquid supply pipeline (503) at the bottom of the gas-liquid separator (101) and the water ring vacuum pump (501). The horizontal circulating cooler (105) is connected to the gas-liquid separator drain port and the water ring vacuum pump (501) replenishment port.

6. A closed-loop water-circulating gas extraction system with gas purification function according to claim 1, characterized in that, The system also includes a sewage discharge device (400), which includes a sewage pump (401) fixed on the top of a common base, and a water seal tank (402) fixed on the top of a common base. The water seal tank (402) is located at the bottom of the three-stage separation device (300). A sewage discharge pipe (306) is installed at the bottom of the separator box of the three-stage separation device (300), and the bottom of the sewage discharge pipe (306) is connected to the water seal tank (402).

7. A closed-loop water-circulating gas extraction system with gas purification function according to claim 1, characterized in that, The centrifugal separation device (600) includes two separation boxes. The separation boxes have a drain chamber (601) inside. The top of the drain chamber (601) is equipped with two symmetrically distributed centrifugal separation rollers (602) through bearings. The outer circumferential wall of the centrifugal separation rollers (602) is fixed with a toothed ring (605). The bottom side wall of the separation box has a drain trough (606).

8. A closed-loop water-circulating gas extraction system with gas purification function according to claim 7, characterized in that, The separation box is equipped with a drive motor. The toothed rings (605) on the outer walls of the two centrifugal separation rollers (602) mesh with each other. The output shaft of the drive motor is fixed with a drive gear, which meshes with one of the toothed rings (605). Centrifugal blades (603) are installed on the inner circumference of the centrifugal separation rollers (602). Centrifugal blade shafts (607) are installed on the centrifugal blades (603). The centrifugal blade shafts (607) are controlled to rotate by a servo motor. The servo motor is installed inside the centrifugal separation rollers (602). The inner circumference of the centrifugal separation rollers (602) is set as a through groove structure, and a sheet filter element (604) is placed in the through groove at the circumference of the centrifugal separation rollers (602).

9. A closed-loop water-circulating gas extraction system with gas purification function, characterized in that, The method steps for a closed-loop water-circulating gas extraction system with gas purification function as described in any one of claims 1-8 include: S1. Gas extraction: The negative pressure generated by the water ring vacuum pump (501) is used to extract the gas from the coal mine to the surface through the negative pressure gas pipeline, and then separate and purify it through the three-stage separation device (300). S2. Gas purification: The extracted gas enters the three-stage separation device (300), and passes through the cyclone separator (301), the blade separator (303), and the filter cartridge separator (304) in sequence to complete multi-stage impurity removal and obtain purified gas. S3. Automatic slag removal: The mixture of coal slag, coal slurry and water separated by the three-stage separation device (300) flows into the water seal tank (402), and then is automatically transported and discharged by the sewage pump (401); S4. Gas transport and gas-water separation: The purified gas enters the water ring vacuum pump (501), and after being compressed by the pump body, it enters the gas-water separation device (100) to separate the gas from the water. The separated gas is discharged through the gas outlet pipe (104) at the top of the gas-water separation device (100) or sent to the gas power generation equipment. S5. Closed-loop water circulation: The hot water separated by the gas-water separator (100) is transported to the liquid supply pipeline (503) via the horizontal circulating cooler (105). After being cooled down by the pipeline, it is directly returned to the water ring vacuum pump (501) for reuse, thus completing the closed-loop water circulation.

10. A closed-loop water-circulating gas extraction system with gas purification function according to claim 9, characterized in that, In step S2, after the gas is treated by the three-stage separation device (300), the impurity filtration and adsorption efficiency reaches more than 99%, and the purified gas is free of waste residue, coal dust and dust-like solid impurities.

Images