CN114177733A - System for coal-bed gas drainage and gas production water-coal separation and water purification and control method - Google Patents
System for coal-bed gas drainage and gas production water-coal separation and water purification and control method Download PDFInfo
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- CN114177733A CN114177733A CN202111453121.8A CN202111453121A CN114177733A CN 114177733 A CN114177733 A CN 114177733A CN 202111453121 A CN202111453121 A CN 202111453121A CN 114177733 A CN114177733 A CN 114177733A
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- 238000000926 separation method Methods 0.000 title claims abstract description 153
- 239000003245 coal Substances 0.000 title claims abstract description 142
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 117
- 238000000746 purification Methods 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000004519 manufacturing process Methods 0.000 title claims description 22
- 239000007789 gas Substances 0.000 claims abstract description 147
- 238000001035 drying Methods 0.000 claims abstract description 56
- 239000007787 solid Substances 0.000 claims abstract description 21
- 239000007788 liquid Substances 0.000 claims abstract description 20
- 239000008235 industrial water Substances 0.000 claims abstract description 11
- 239000000203 mixture Substances 0.000 claims abstract description 10
- 239000000725 suspension Substances 0.000 claims abstract description 4
- 239000013067 intermediate product Substances 0.000 claims abstract 11
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 48
- 238000005406 washing Methods 0.000 claims description 20
- 238000004140 cleaning Methods 0.000 claims description 18
- 239000003250 coal slurry Substances 0.000 claims description 15
- 238000004064 recycling Methods 0.000 claims description 15
- 238000005303 weighing Methods 0.000 claims description 6
- 125000004122 cyclic group Chemical group 0.000 claims description 4
- 230000008859 change Effects 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 230000008676 import Effects 0.000 claims description 3
- 239000000543 intermediate Substances 0.000 claims 16
- 238000001556 precipitation Methods 0.000 claims 1
- 208000028659 discharge Diseases 0.000 description 13
- 238000011065 in-situ storage Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/50—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition
- B01D29/56—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in series connection
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
- C10L3/06—Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K3/02 or C10K3/04
- C10L3/10—Working-up natural gas or synthetic natural gas
- C10L3/101—Removal of contaminants
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/34—Arrangements for separating materials produced by the well
- E21B43/38—Arrangements for separating materials produced by the well in the well
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- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
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Abstract
The invention discloses a system and a control method for coal-bed gas drainage gas-water separation and water purification, wherein a gas, water and coal mixture generates a first-stage intermediate product through a gas separation and collection device, the gas is collected, the first-stage intermediate product is further separated by a multistage solid separation system, a suspension is sent into the multistage water purification system to form a second-stage intermediate product, the second-stage intermediate product is sent into a coal slime drying system to be dried and then is discharged and collected, the suspension formed by the separation of the first-stage intermediate product is sent into the multistage water purification system to be purified, liquid can be discharged into an industrial water system for reuse, meanwhile, a third-stage intermediate product is formed, the third-stage intermediate product returns to the gas separation and collection system again to repeat the separation steps, and the actions of the gas separation and collection system, the multistage solid separation system, the coal slime drying system and the multistage water purification and reuse system are controlled through the control system, the technical problem that the mixture of gas, water and coal cannot be fully automatically and finely separated in multiple stages in the prior art is solved.
Description
Technical Field
The invention belongs to the field of chemical separation equipment, and particularly relates to a system for water-coal separation and water purification of coal bed methane gas production gas and a control method.
Background
Along with the rapid growth of the economy of China, the demand for energy is larger and larger, the contradiction between supply and demand of petroleum and natural gas in China exists for a long time, and if the supply of conventional oil gas is only relied on, the demand for rapid development of the economy of China is difficult to meet, so that the development of the unconventional oil gas industry becomes an effective method for solving the problem of energy safety in China.
The extensive development of tectonic coal and the abundance of coal bed gas resources of the tectonic coal in China are remarkable characteristics of Chinese coal and coal bed gas resources, and the Chinese coal bed gas resources have large quantity and are the most realistic and reliable unconventional oil and gas resources at present. The development of the coal bed gas has important significance for relieving the current situation of oil and gas resource shortage in China, reducing the disaster degree of mines, reducing the emission of greenhouse gases and the like. The coal bed gas mainly refers to methane gas existing in a coal bed in an adsorption state, belongs to unconventional natural gas, and is also called as gas in a coal mine area. At present, the tectonic coal development area is a forbidden area for in-situ coal bed gas development, and the in-situ coal bed gas development adopted in the tectonic coal development area is not deeply reported. And the development of coal bed gas generates a large amount of gas-water-coal mixture, so that the realization of the high-efficiency and full-automatic separation and collection of gas-water-coal is a difficult problem in the development process of adopting an in-situ coal bed gas horizontal well in a constructed coal development area.
Disclosure of Invention
The invention aims to provide a system and a control method for water-coal separation and water purification of gas produced by coal bed methane discharge, and solves the technical problem that a gas-water-coal mixture cannot be separated in the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the invention relates to a system for water-coal separation and water purification of coal bed methane gas production, which comprises: gas separation collecting system, multistage solid separation system, coal slime drying system and multistage aqueous cleaning system of recycling, gas separation collecting system separates gas, water and coal three-phase mixture and collects gas and form one-level intermediate, one-level intermediate gets into multistage solid separation system, multistage solid separation system further separates one-level intermediate, collects gas, sends liquid into multistage aqueous cleaning system of recycling to form second grade intermediate, second grade intermediate gets into forms dry coal slime discharge system after the coal slime drying system is dried and is separated, the liquid that one-level intermediate separation formed gets into multistage aqueous cleaning system of recycling after-purifying can discharge industrial water system for reuse, forms tertiary intermediate simultaneously, tertiary intermediate gets back to gas separation collecting system again and repeats above-mentioned separation step, and the actions of the gas separation and collection system, the multistage solid separation system, the coal slime drying system and the multistage water purification and reuse system are controlled by the control system.
The invention relates to a system for coal-bed gas drainage gas production water-coal separation and water purification, which comprises a gas separation box, wherein the gas separation box is provided with a feed pipeline, the feed pipeline is provided with a feed valve, the gas separation box is connected with a washing box through a pipeline, the top of the washing box is connected with a plurality of gas collection devices, valves are arranged at the inlets of the gas collection devices, a feed rapping device is arranged in the gas separation box, and the bottom of the gas separation box is connected with a multistage solid separation system through an electric valve.
The invention relates to a system for water-coal separation and water purification of coal bed methane gas production, wherein a high material level sensor is arranged in a gas separation tank.
The invention relates to a system for water-coal separation and water purification of coal bed methane gas production gas, wherein the multistage solid separation system comprises a separation tower, the top of the separation tower is connected with an electric valve, the separation tower is connected with a multistage water purification and recycling system through a tower bottom water-coal lift pump, the middle part of the separation tower is provided with a plurality of filters, the separation tower is divided into a plurality of separation spaces from top to bottom by the filters, each separation space is internally provided with a rapping device, and the side surface of each separation space is communicated with a coal slime drying system through an electric valve.
The invention is used for a system for water-coal separation and water purification of coal bed methane gas production gas, and a tower bottom pressure gauge is arranged at the bottom of the separation tower.
The coal slurry drying system comprises a coal slurry drying tower, the coal slurry drying tower is communicated with a plurality of electric doors, heating and drying equipment is arranged in the coal slurry drying tower, a coal cleaning door is arranged at the bottom of the coal slurry drying tower, weighing equipment is arranged above the coal cleaning door, and the coal slurry drying tower is connected with a water washing tank through a pipeline.
The invention relates to a system for water-coal separation and water purification of coal bed methane gas production gas, wherein a temperature measuring instrument is arranged in a coal slime drying tower.
The invention relates to a system for water-coal separation and water purification of coal bed methane gas production gas, which comprises: many headers, it is connected with the water coal elevator pump at the bottom of the tower to ally oneself with case one end more, the export department of water coal elevator pump at the bottom of the tower is provided with the purifying valve, the exit end and the water collecting pit of many headers are connected, be equipped with the industry water discharge pump in the water collecting pit, be equipped with a plurality of grades of filter screens between the import of many headers and the export, it is a plurality of the filter screen will ally oneself with the case more and fall into a plurality of water purification spaces, each in the water purification space all have bottom of the case pressure gauge, each water purification space bottom is through purification water electrically operated gate and wet return intercommunication, the coal slime delivery pump has on the wet return, the coal slime delivery pump passes through pipeline and gas separation case intercommunication.
The invention relates to a control method of a system for water-coal separation and water purification of gas produced by coal bed methane discharge, wherein a gas, water and coal mixture enters a gas separation tank through a feed pipeline under the control of a feed valve, the gas enters a water washing phase and is washed, and a gas collection device collects the gas after washing, when one gas collecting device is full of gas, the other gas collecting device is automatically switched to collect the gas under the control of a valve, and a primary intermediate is formed at the moment, the primary intermediate is stored in a gas separation box for primary sedimentation, a high material level sensor is arranged on the wall of the gas separation box, when the first-level intermediate reaches the high level, the control system sends out an instruction to open the electric valve at the bottom of the gas separation tank after receiving a signal of the high level of the first-level intermediate in the gas separation tank, the feeding rapping device is opened, the first-stage intermediate enters a separation tower, and after the feeding is finished, the control system sends out an instruction to close an electric valve and a feeding rapping device at the bottom of the box;
at the moment, the primary intermediate is positioned in the separation tower, the control system sends out an instruction to start a rapping device positioned on the tower wall in the separation tower to reach a set time to form a secondary intermediate, an electric door (24) connected with a coal slime drying tower is opened at the moment, the secondary intermediate enters the coal slime drying tower, meanwhile, liquid in the separation tower is filtered into the tower bottom, the pressure measured by a tower bottom pressure gauge is transmitted into the control system to be compared with a target value, the actual pressure is not less than the target pressure and lasts for a certain time, the control system sends out an instruction to start a tower bottom water-coal lifting pump, and the liquid filtered in the separation tower is pumped into a multi-header;
the coal slime drying tower dries a secondary intermediate, wherein the temperature of the coal slime measured by the temperature measuring instrument reaches a set target value, and the change rate of data read by the weighing equipment is smaller than a set value, the control system sends an opening instruction for opening a coal cleaning door to collect coal formed by drying the secondary intermediate, and gas separated out during the drying of the secondary intermediate is collected by a gas collecting device after being washed by a washing tank;
the coal water turbid liquid that many headers were gone into to tower bottom coal water elevator pump is handled, control system receives the bottom of the box pressure gauge of every independent water purification space bottom and records data and compare, if the data that record reaches the settlement target value, the purification electrically operated gate of the liquid return pipe connection of the bottom half that every independent water purification space corresponds is opened, coal slime delivery pump opens simultaneously, squeeze into the tertiary intermediate matter that forms and circulate in the gas separation case and handle, many headers are made things convenient for the final overflow water inflow water collecting pit of case to collect, the water collecting pit liquid level reaches the settlement target value, then the industrial water discharge pump squeezes into the interior industrial water system of mining site with the water in the water collecting pit and realizes zero outer row and use in order to circulate.
The invention has the following beneficial effects: the system and the control method for gas-water-coal separation and water purification of coal bed methane drainage gas production are provided, so that the full-automatic multi-stage separation collection of gas, water and coal generated in the drainage and pressure relief development process of the horizontal well of the structural coal in-situ coal bed methane and the control method and the system for water purification zero-discharge treatment can realize full automation of the multi-stage separation collection of gas-water-coal and water purification zero-discharge treatment, greatly reduce the number of personnel and the labor intensity of the personnel, and greatly improve the production efficiency on the premise of ensuring the fine separation quality.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic diagram of an embodiment of the present invention;
FIG. 2 is an overall control flow diagram of a system of an embodiment of the present invention;
FIG. 3 is a flow chart of a gas separation collection system control according to an embodiment of the present invention;
FIG. 4 is a flow chart of the control of a multi-stage solids separation system in accordance with an embodiment of the present invention;
FIG. 5 is a flow chart of the control of the coal slurry drying system according to the embodiment of the present invention;
fig. 6 is a control flow diagram of a multi-stage water purification and reuse system according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
As shown in fig. 1 to 6, the system and the control method for water-coal separation and water purification of coalbed methane gas production comprises: gas separation collecting system 1, multistage solid separation system 2, coal slime drying system 3 and multistage aqueous cleaning system of recycling 4, gas separation collecting system 1 separates gas, water and coal three-phase mixture and collects gas and forms the one-level intermediate, the one-level intermediate gets into multistage solid separation system 2, multistage solid separation system 2 further separates the one-level intermediate, collects gas, sends liquid into multistage aqueous cleaning system of recycling 4 to form the second grade intermediate, the second grade intermediate gets into and forms dry coal slime discharge system after coal slime drying system 3 drying separation, the liquid that the separation of one-level intermediate formed gets into multistage aqueous cleaning system of recycling 4 after purifying can discharge industrial water system for recycling, forms tertiary intermediate simultaneously, tertiary intermediate gets back to gas separation collecting system 1 again and repeats above-mentioned separation step, the actions of the gas separation and collection system 1, the multistage solid separation system 2, the coal slime drying system 3 and the multistage water purification and recycling system 4 are controlled by a control system.
In a preferred embodiment of the invention, the gas separation and collection system 1 comprises a gas separation box 19, the gas separation box 19 is provided with a feed pipeline 11, the feed pipeline 11 is provided with a feed valve 12, the gas separation box 19 is connected with a water washing box 14 through a pipeline, the top of the water washing box 14 is connected with a plurality of gas collection devices 15, a valve 18 is arranged at an inlet of each gas collection device 15, a feed rapping device 17 is arranged in the gas separation box 19, the bottom of the gas separation box 19 is connected with the multistage solid separation system 2 through an electric valve 13, and the bottom of the water washing box 14 is connected with an output water pump 16.
In the preferred embodiment of the present invention, a high level sensor is provided in the gas separation tank 19.
In a preferred embodiment of the invention, the multistage solid separation system 2 comprises a separation tower 26, the top of the separation tower 26 is connected with an electric valve 13, the separation tower 26 is connected with the multistage water purification and reuse system 4 through a tower bottom water-coal lift pump 23, the middle part of the separation tower 26 is provided with a plurality of filters 21, the separation tower 26 is divided into a plurality of separation spaces from top to bottom by the filters 21, each separation space is provided with a rapping device 25, and the side surface of each separation space is communicated with the coal slime drying system 3 through an electric valve 24.
In the preferred embodiment of the present invention, the separation column 26 has a column bottom load cell 22 at the bottom.
In a preferred embodiment of the present invention, the coal slurry drying system 3 includes a coal slurry drying tower 34, the coal slurry drying tower 34 is communicated with the plurality of electric doors 24, a heating and drying device 33 is disposed in the coal slurry drying tower 34, a coal cleaning door 32 is disposed at the bottom of the coal slurry drying tower 34, a weighing device 31 is disposed above the coal cleaning door 32, and the coal slurry drying tower 34 is connected to the water washing tank 14 through a pipeline.
In a preferred embodiment of the present invention, a temperature measuring instrument 35 is disposed in the coal slurry drying tower 34.
In a preferred embodiment of the present invention, said multi-stage water purification and reuse system 4 comprises: many headers 48, many headers 48 one end is connected with water coal elevator pump 23 at the bottom of the tower, the exit of water coal elevator pump 23 at the bottom of the tower is provided with purification valve 41, many headers 48's exit end is connected with water collecting pit 44, be equipped with industrial water discharge pump 45 in the water collecting pit 44, be equipped with a plurality of grades of filter screens 42 between many headers 48's the import and the export, a plurality of filter screens 42 fall into a plurality of water purification spaces with many headers 48, each all have bottom of the case pressure gauge 47 in the water purification space, each water purification space bottom is through purifying water electric door 46 and wet return intercommunication, coal slime delivery pump 43 has on the wet return, coal slime delivery pump 43 passes through pipeline and gas separation case 19 intercommunication.
In the preferred embodiment of the invention, the gas, water and coal mixture enters the gas separation box 19 through the feeding pipeline 11 under the control of the feeding valve 12, after the gas enters the water washing phase 14 for water washing, the gas collecting device 15 collects the gas after the water washing, when one gas collecting device 15 is full of gas, the control of the valve 18 is automatically switched to the other gas collecting device 15 for collection, and a primary intermediate is formed, the primary intermediate is stored in a gas separation box 19 for primary sedimentation, a high level sensor is arranged on the wall of the gas separation box 19, when the first-level intermediate reaches the high level, the control system sends out an instruction to open the electric valve 13 at the bottom of the gas separation box 19 after receiving the signal of the high level of the first-level intermediate in the gas separation box 19, and the feeding rapping device 17 is opened, the first-stage intermediate enters a separation tower 26, and after the feeding is finished, the control system sends out an instruction to close an electric valve 13 at the bottom of the box and a feeding rapping device 17;
at the moment, the primary intermediate is positioned in the separation tower 26, the control system sends out an instruction to start a rapping device 25 positioned on the tower wall in the separation tower 26 to reach a set time to form a secondary intermediate, an electric door (24) connected with a coal slime drying tower 34 is opened at the moment, the secondary intermediate enters the coal slime drying tower 34, meanwhile, liquid in the separation tower 26 is filtered into the tower bottom, the pressure measured by the tower bottom pressure gauge 22 is transmitted into the control system to be compared with a target value, the actual pressure is not less than the target pressure and lasts for a certain time, the control system sends out an instruction to start a tower bottom water coal lifting pump 23, and the liquid filtered in the separation tower 26 is pumped into a multi-connection box 48;
the coal slime drying tower 34 dries the secondary intermediate, wherein the temperature of the coal slime measured by the temperature measuring instrument 35 reaches a set target value, and the change rate of the data read by the weighing device 31 is smaller than a set value, the control system sends an opening instruction for opening the coal cleaning door 32 to collect the coal formed by drying the secondary intermediate, and the gas separated out during the drying of the secondary intermediate is washed by the water washing tank 14 and then collected by the gas collecting device 15;
the multi-header 48 processes the water-coal suspension pumped by the water-coal lifting pump 23 at the bottom of the tower, the control system receives and compares the data measured by the bottom pressure gauge 47 at the bottom of each independent water purification space, if the measured data reaches a set target value, the purification electric door 46 connected with the liquid return pipeline at the bottom of the box corresponding to each independent water purification space is opened, meanwhile, the coal slime delivery pump 43 is opened, the formed three-stage intermediate is pumped into the gas separation box 19 for cyclic processing, the final overflow water of the multi-header 48 flows into the water collection tank 44 for collection, the liquid level of the water collection tank 44 reaches the set target value, and the industrial water discharge pump 45 pumps the water collection tank 44 into the industrial water system in the mine field to realize zero discharge for cyclic use.
In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.
Claims (9)
1. A system and a control method for coal-bed methane gas production water-coal separation and water purification are characterized by comprising the following steps: gas separation collecting system (1), multistage solid piece-rate system (2), coal slime drying system (3) and multistage aqueous cleaning system of recycling (4), gas separation collecting system (1) separates gas, water and coal three-phase mixture and collects gas and form one-level intermediate, one-level intermediate gets into multistage solid piece-rate system (2), multistage solid piece-rate system (2) further separates one-level intermediate, collects gas, sends liquid into multistage aqueous cleaning system of recycling (4) to form second grade intermediate, second grade intermediate gets into and forms dry coal slime discharge system after coal slime drying system (3) drying separation, the liquid that one-level intermediate separation formed gets into multistage aqueous cleaning system of recycling (4) after-purifying can discharge industry water system for recycling, and meanwhile, a three-level intermediate is formed, the three-level intermediate returns to the gas separation and collection system (1) again to repeat the separation steps, and the actions of the gas separation and collection system (1), the multistage solid separation system (2), the coal slime drying system (3) and the multistage water purification and recycling system (4) are controlled through the control system.
2. The system for coal bed methane gas production water coal separation and water purification according to claim 1, wherein the gas separation collection system (1) comprises a gas separation tank (19), the gas separation tank (19) is provided with a feed pipeline (11), the feed pipeline (11) is provided with a feed valve (12), the gas separation tank (19) is connected with a water washing tank (14) through a pipeline, the top of the water washing tank (14) is connected with a plurality of gas collection devices (15), a valve (18) is arranged at an inlet of each gas collection device (15), a feed rapping device (17) is arranged in the gas separation tank (19), and the bottom of the gas separation tank (19) is connected with the multistage solid separation system (2) through an electric valve (13).
3. The system for coal-bed methane gas production water-coal separation and water purification according to claim 2, wherein a high level sensor is arranged in the gas separation tank (19).
4. The system for coal-bed methane gas production water-coal separation and water purification according to claim 3, characterized in that, the multistage solid separation system (2) includes a separation tower (26), the top of the separation tower (26) is connected with an electric valve (13), the separation tower (26) is connected with the multistage water purification recycling system (4) through a tower bottom water-coal lift pump (23), a plurality of filters (21) are arranged in the middle of the separation tower (26), the filters (21) divide the separation tower (26) into a plurality of separation spaces from top to bottom, each of which is provided with a rapping device (25), and each of which is communicated with the coal slime drying system (3) through the electric valve (24) on the side surface.
5. The system for coal-water separation and water purification of coalbed methane gas production according to claim 4, characterized in that the bottom of the separation tower (26) is provided with a tower bottom pressure gauge (22).
6. The system for coal bed methane gas production water coal separation and water purification of claim 5, characterized in that, coal slime drying system (3) includes coal slime drying tower (34), coal slime drying tower (34) and a plurality of electrically operated gate (24) intercommunication, heating drying equipment (33) have in the coal slime drying tower (34), coal slime drying tower (34) bottom has coal cleaning door (32), weighing equipment (31) have in coal cleaning door (32) top, coal slime drying tower (34) are connected with washing case (14) through the pipeline.
7. The system for coal-bed methane gas production water-coal separation and water purification according to claim 6, characterized in that a temperature measuring instrument (35) is arranged in the coal slurry drying tower (34).
8. The system for coal-coal water separation and purification of coalbed methane gas production water according to claim 7, wherein the multi-stage water purification and reuse system (4) comprises: many headers (48), many headers (48) one end is connected with water coal elevator pump (23) at the bottom of the tower, the exit of water coal elevator pump (23) at the bottom of the tower is provided with purification valve (41), the exit end and the water collecting pit (44) of many headers (48) are connected, be equipped with industrial water discharge pump (45) in water collecting pit (44), be equipped with a plurality of grades of filter screen (42) between the import and the export of many headers (48), a plurality of filter screen (42) fall into a plurality of water purification spaces with many headers (48), each all have bottom of the case pressure gauge (47) in the water purification space, each water purification space bottom is through purification water electric door (46) and wet return intercommunication, coal slime delivery pump (43) have on the wet return, coal slime delivery pump (43) communicate through pipeline and gas separation case (19).
9. The control method of the system for coal bed methane gas production water-coal separation and water purification according to claim 8, characterized in that the gas, water and coal mixture enters a gas separation tank (19) through a feed pipe (11) under the control of a feed valve (12), the gas after water washing in a water washing phase (14) is collected by a gas collecting device (15), when one gas collecting device (15) is full of gas, the control of a valve (18) is automatically switched to another gas collecting device (15) for collection, a primary intermediate product is formed, the primary intermediate product is stored in the gas separation tank (19) for primary precipitation, a high level sensor is mounted on the wall of the gas separation tank (19), when the primary intermediate product reaches a high level, the control system sends a command to open an electric valve (13) at the bottom of the tank after receiving a high signal of the primary intermediate product in the gas separation tank (19), the feeding rapping device (17) is started, the primary intermediate enters the separation tower (26), and the control system sends out an instruction to close the electric valve (13) at the bottom of the box and the feeding rapping device (17) after the feeding is finished;
at the moment, the first-stage intermediate is positioned in the separation tower (26), the control system sends out an instruction to start a rapping device (25) positioned on the tower wall in the separation tower (26) to reach a set time to form a second-stage intermediate, an electric door (24) connected with a coal slime drying tower (34) is opened at the moment, the second-stage intermediate enters the coal slime drying tower (34), meanwhile, liquid in the separation tower (26) is filtered into the tower bottom, a pressure measured by the tower bottom pressure gauge (22) is transmitted into the control system to be compared with a target value, the actual pressure is not less than the target pressure and lasts for a certain time length, the control system sends out an instruction to start a tower bottom water-coal lifting pump (23), and the filtered liquid in the separation tower (26) is pumped into a multi-connection box (48);
the coal slime drying tower (34) dries a secondary intermediate, wherein a temperature measuring instrument (35) measures that the temperature of the coal slime reaches a set target value, and the change rate of data read by the weighing device (31) is smaller than a set value, the control system sends out an opening instruction for opening a coal cleaning door (32) to collect coal formed by drying the secondary intermediate, and gas separated out during the drying process of the secondary intermediate is collected by a gas collecting device (15) after being washed by a water washing tank (14);
the multi-header (48) is used for processing water-coal suspension pumped by the tower bottom water-coal lifting pump (23), a control system receives data measured by a box bottom pressure gauge (47) at the bottom of each independent water purification space and compares the data, if the measured data reaches a set target value, a purification electric door (46) connected with a liquid return pipeline at the bottom of a box body corresponding to each independent water purification space is opened, a coal slime delivery pump (43) is simultaneously opened, formed three-stage intermediates are pumped into a gas separation box (19) for cyclic processing, finally overflow water in the multi-header (48) flows into a water collection pool (44) for collection, the liquid level of the water collection pool (44) reaches the set target value, and an industrial water discharge pump (45) pumps the water in the water collection pool (44) into an industrial water system in a mine field to realize zero discharge for cyclic use.
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