LU500690B1 - Experimental method for continuous separation of mixture of gas-containing coal and water - Google Patents

Abstract

An experimental method for continuous separation of a mixture of gas-containing coal and water, including a feeding crusher. The separation device includes a storehouse; a sealed storehouse door and a feeding pipe are mounted on the top of the storehouse. A level-1 sieve plate is mounted on the top inside of the storehouse; Mesh diameters of the level-1 sieve plates, the level-2 sieve plates and the level-3 sieve plates are sequentially decreased; An insulation pump is mounted inside the insulation cover. An insulation cover is mounted at the bottom of the level-2 sieve plate; The insulation cover includes a vertical plate, a stripper plate and a water baffle. A second heating panel is embedded into the surface of the stripper plate. A first heating panel is embedded into the surface of the water baffle. The actual separation process can be accurately simulated.

Description

DESCRIPTION

EXPERIMENTAL METHOD FOR CONTINUOUS SEPARATION OF MIXTURE OF GAS-CONTAINING COAL AND WATER Technical Field The present invention belongs to the technical field of coalbed methane exploitation, and particularly relates to an experimental method for continuous separation of a mixture of gas-containing coal and water.

Background Traditional energy resources have been gradually unable to meet the current excessive consumption of the energy resources, but the current global energy shortage situation can be alleviated by development and utilization of coalbed methane. The development and utilization of the coalbed methane may greatly lower a gas accident rate of a coal mine and decrease mine discharge greenhouse gases. The coalbed methane may further serve as clean energy to produce huge economic benefits, and has great significances for ensuring energy security and lowering external dependence of natural gas.

Extensive development of tectonic coal and resource abundance of coalbed methane of the tectonic coal are prominent features of Chinese coal and coalbed methane resources. With the adoption of a horizontal well hole pressure-relief exploitation system of an in-situ coalbed methane for the tectonic coal, the coalbed methane can be efficiently and continuously developed. However, a great deal of mixtures of gas-containing coal, water and gas are produced in the development process. How to efficiently, continuously and rapidly separate the gas, the water and the coal is an important theoretical and technical problem of horizontal well hole pressure relief exploitation of in-situ coalbed methane for the tectonic coal. However, since a development zone of the tectonic coal is a forbidden zone of in-situ coalbed methane development, there are no in-depth reports on in-situ coalbed methane development technologies and methods; and there are also few research reports on efficient, continuous and rapid separation of the gas, the water and the coal. Due to inaccurate specific objects in a common two-phase or three-phase mixture separation method, an efficient, continuous and rapid separation problem of the gas, the water and the coal produced during the horizontal well hole pressure relief exploitation of the in-situ coalbed methane for the tectonic coal is difficult to be solved.

Efficient, continuous and rapid separation of lots of mixed fluid of gas-containing coal having viscosity, gas and water produced in the development zone of the tectonic coal through the horizontal well hole pressure relief exploitation of the in-situ coalbed methane is the key to efficient coal mining, gas production and water resource recycling. However, many obstacles exist in a diversion solution of determining the mixed fluid of the gas and the water through field operations; cost is high; a risk coefficient is large; and a specific separation solution cannot be rapidly determined. In view of this, effective separation and collection of the mixed fluid of the gas-containing coal having viscosity, the gas and the water produced by simulating the horizontal well hole pressure relief exploitation of the in-situ coalbed methane in the development zone of the tectonic coal in a lab are crucial to researching the development zone of the tectonic coal so as to realize successful exploitation of the in-situ coalbed methane, may provide important theoretical guidance for the horizontal well hole pressure relief exploitation of the in-situ coalbed methane in the development zone of the tectonic coal, and have important theoretical significances and actual production guidance significances on coalbed methane development in the development zone of the tectonic coal.

Summary

With respect to the defects existing in the prior art, the present invention provides an experimental method for continuous separation of a mixture of gas-containing coal and water.

Specific technical solutions are as follows:

The experimental method for continuous separation of the mixture of gas-containing coal and water includes the following steps:

S1, pre-adjustment before the experiment:

judging granularity of solid-phase coal particles in the mixture; determining a mesh number and an inclination angle of a sieve plate of each level; and replacing and adjusting the sieve plate of each level,

extracting gases in a storehouse by a vacuum pump, so that the interior of the storehouse 1s in a vacuum state;

S2, separation and desorption experiments of the mixture:

discharging the mixture of the gas-containing coal and the water into the storehouse by a feeding pipe;

screening the mixture by a level-1 sieve plate and a level-2 sieve plate; screening out larger coal particles and enabling the larger coal particles to flow to a stripper plate so as to be finally discharged out of the storehouse; downwards discharging fine coal particles and water into a V-shaped collecting cavity encircled by a water baffle and a level-3 sieve plate; heating the coal particles that flow through the stripper plate by a first heating mechanism outside the stripper plate during discharging so as to desorb coalbed methane;

enabling the water to pass through the level-3 sieve plate; discharging the water out of the storehouse by a slime water discharging pipe; continuously gathering the fine coal particles in the collecting cavity; heating the coal particles in the collecting cavity by a second heating mechanism on the water baffle during gathering so as to desorb the coalbed methane;

downwards rotating the level-3 sieve plate when the fine coal particles are stacked to a certain height; and discharging the fine coal particles out of the storehouse by a fine coal particle discharging pipe: S3, experimental post-treatment: discharging the coalbed methane that rises to the top of the storehouse to a coalbed methane treatment tank by an exhaust pipe; cleaning the sieve plates by cleaning mechanisms on the tops of the sieve plates of all levels.

Further, the step that the coal particles flowing through the stripper plate are heated and desorbed by the first heating mechanism 1s specifically as follows: the first heating mechanism includes a second heating panel located inside the stripper plate and hot air generation mechanisms located on the top of the stripper plate at intervals; when flowing through the stripper plate, the coal particles are heated by the second heating panel from the bottom; and the hot air generation mechanisms blow out hot air from the tops, so that the coal particles are rapidly heated and the coalbed methane inside the coal particles is fully desorbed.

Further, each of the hot air generation mechanisms includes an insulated hot-air blower; the heated gases are discharged downwards by the insulated hot-air blower; two air inlets are communicated at an inlet of the insulated hot-air blower; one air inlet is formed in the storehouse; the other air inlet extends out of the storehouse and is communicated with a methane tank; a major gas source of the insulated hot-air blower is the coalbed methane inside the storehouse, so that the storehouse is in a vacuum state; and when the coalbed methane in the storehouse is insufficient, external gases are provided.

Further, the step that the coal particles in the collecting cavity are heated by the second heating mechanism is specifically as follows: the second heating mechanism includes a first heating panel located inside the water baffle; and in a process of continuously gathering the fine coal particles in the collecting cavity, the fine coal particles may be continuously heated by the first heating panel, so that the coalbed methane in the coal particles is desorbed.

Further, when the fine coal particles are stacked to the certain height, specifically, a transparent observation window is formed at a position of the outer part of the storehouse opposite to the collecting cavity and the stripper plate; and a gathering state of the coal particles in the collecting cavity can be observed by a worker via the transparent observation window.

Further, a high-pressure nitrogen bottle 1s mounted outside the storehouse and is in signal control connection with a methane concentration alarm device and a centralized control device; in the S2, once the methane concentration inside the storehouse exceeds a set concentration range, the methane concentration alarm device gives an alarm; and the high-pressure nitrogen bottle is automatically opened by the centralized control device to rapidly fill nitrogen into the storehouse.

Further, an outlet of the exhaust pipe is connected in parallel with a sampling pump; and a bottom outlet of the collecting cavity is connected in parallel with a liquid sampling pipe.

The present invention has beneficial effects as follows: lots of the mixed fluid of the gas-containing coal having certain viscosity, gas and water produced through the horizontal well hole pressure relief exploitation of the in-situ coalbed methane may be added into the present experimental apparatus; an effect of fully separating the coal particles in coal briquettes, the water and the coalbed methane is achieved by changing and regulating action parameters of each device in the present experimental apparatus; the actual separation process can be accurately simulated; the separation process and each of the action parameters have extremely important guidance significances on the actual production; and risk of site operation experiments 1s avoided, thereby achieving simple, convenient and efficient coalbed methane exploitation.

Description of Drawings 1200600 Fig. 1 shows a structural schematic diagram of an experimental method for continuous separation of a mixture of gas-containing coal and water in the present invention; Fig. 2 shows a structural schematic diagram of a level-2 sieve plate flushing mechanism in the present invention; Fig. 3 shows a structural schematic diagram of a matched structure of a level-1 sieve plate, a level-2 sieve plate and a level-3 sieve plate in the present invention: Fig. 4 shows a structural schematic diagram of a hot air generation mechanism in the present invention; and Fig. 5 shows a structural schematic diagram of storehouse distribution in the present invention.

In the drawings, 1: storehouse; 101: sealed storehouse door; 102: feeding pipe; 2: level-1 sieve plate flushing mechanism; 3: level-1 sieve plate; 301: sliding rail; 4: level-2 sieve plate flushing mechanism; 401: slide bar; 402: nozzle; 403: hairbrush; 5: level-2 sieve plate; 6: level-3 sieve plate flushing mechanism; 7: level-3 sieve plate; 8: rotary supporting mechanism; 801: electric hydraulic rod; 802: guide rail; 803: telescopic support rod; 9: insulation cover; 901: water baffle; 9011: first heating panel; 902: stripper plate; 9021: second heating panel; 903: vertical plate; 10: first discharging hopper; 1001: liquid sampling pipe; 11: discharging three-way valve; 1101: fine coal particle discharging pipe; 1102: slime water discharging pipe; 12: monitoring host box; 13: insulation pump; 14: insulation wool plate; 15: hot air generation mechanism; 1501: insulated hot-air blower; 1502: air outlet housing; 1503: inner air inlet pipe; 1504: outer air inlet pipe; 16: exhaust pipe; 17: coalbed methane treatment tank; 18: level-1 sieve plate buffer mechanism; 1801: upper fixing rack; 1802: installation block; 1803: spring; 1804: lower fixing rack; 19: level-2 sieve plate buffer mechanism; 20: mixture inlet pipe; 21: feeding crusher; 22:

feeding three-way valve; 23: second discharging hopper; 24: nitrogen gas bottle; 25: sampling pump. Detailed Description To clearly understand purposes, technical solutions and advantages of the present invention, the present invention will be further described in detail below in combination with embodiments. It should be understood that, specific embodiments described herein are merely used for explaining the present invention, rather than limiting the present invention, As shown in Fig. 1, an experimental method for continuous separation of the mixture of gas-containing coal and water includes the following steps: S1, Pre-adjustment before the experiment: Granularity of solid-phase coal particles in the mixture was judged; a mesh number and an inclination angle of a sieve plate of each level were determined; the sieve plate of each level was replaced and adjusted; and the sieve plate of each level can be adjusted to a needed angle and replaced to a needed mesh number according to a diameter of coal particles needing to be processed, so that an experimental separation apparatus has a wider application range.

Gases in a storehouse were extracted by a vacuum pump, so that the interior of the storehouse was in a vacuum state; and due to the vacuum state, separation and storage purity of the coalbed methane can be ensured.

S2, Separation and desorption experiments of the mixture: The mixture of the gas-containing coal and the water was discharged into the storehouse by a feeding pipe; the overall apparatus, wall thickness and material of the storehouse can bear a high temperature of about 1200°C or higher and can bear a pressure not less than 8 MPa.

The mixture was screened by a level-1 sieve plate and a level-2 sieve plate; larger coal particles were screened out and flowed to a stripper plate so as to be finally discharged out of the storehouse; fine coal particles and water were downwards discharged into a V-shaped collecting cavity encircled by a water baffle and a level-3 sieve plate; the coal particles that flowed through the stripper plate were heated by a first heating mechanism outside the stripper plate during discharging so as to desorb coalbed methane; the step that the coal particles flowing through the stripper plate were heated and desorbed by the first heating mechanism was specifically as follows: the first heating mechanism included a second heating panel located inside the stripper plate and hot air generation mechanisms located on the top of the stripper plate at intervals; when flowing through the stripper plate, the coal particles were heated by the second heating panel from the bottom; and the hot air generation mechanisms blew out hot air from the tops, so that the coal particles were rapidly heated and the coalbed methane inside the coal particles was fully desorbed.

The water passed through the level-3 sieve plate and then was discharged out of the storehouse by a slime water discharging pipe; the fine coal particles were continuously gathered in the collecting cavity; the coal particles in the collecting cavity were heated by a second heating mechanism on the water baffle during gathering so as to desorb the coalbed methane; the step that the coal particles in the collecting cavity were heated by the second heating mechanism was specifically as follows: the second heating mechanism included a first heating panel located inside the water baffle; and in a process of continuously gathering the fine coal particles in the collecting cavity, the fine coal particles may be continuously heated by the first heating panel to desorb the coalbed methane in the coal particles.

A maximum variation range of temperatures produced by the first heating mechanism and the second heating mechanism may be up to 110°C; and separation effects at different temperatures are achieved. When the experimental temperature maintains at 100°C or higher, the internal water is gaseous, and water vapor is formed, so that the coal particles can be dehydrated as much as possible. Due to existence of the water vapor, on one hand, functions of the water vapor are the same as those of the above nitrogen, and an explosive limit range of methane can be narrowed, thereby lowering methane explosion risk; on the other hand, water on the surface of the coal particles is rapidly decreased, and by matching the heating and adsorbing operations, the coalbed methane can be rapidly released as much as possible.

The level-3 sieve plate was downwards rotated when the fine coal particles are stacked to a certain height, so that the fine coal particles were discharged out of the storehouse by a fine coal particle discharging pipe.

S3, Experimental post-treatment: The coalbed methane that rose to the top of the storehouse was discharged to a coalbed methane treatment tank by an exhaust pipe; the sieve plates were cleaned by cleaning mechanisms on the tops of the sieve plates of all levels.

As an improvement of the above technical solutions, each of the hot air generation mechanisms includes an insulated hot-air blower; the heated gases are discharged downwards by the insulated hot-air blower; two air inlets are communicated at an inlet of the insulated hot-air blower; one air inlet 1s formed in the storehouse; the other air inlet extends out of the storehouse and is communicated with a methane tank; a major gas source of the insulated hot-air blower is the coalbed methane inside the storehouse, so that the storehouse is in a vacuum state; and when the coalbed methane in the storehouse is insufficient, external gases are provided. When the system is closed, the coalbed methane desorbed from the coal particles inside the system provides hot gas so as to form heat purging, thereby forming inner circulation of the hot gas. When the inner desorbed coalbed methane 1s insufficient to form the inner circulation, an outer air inlet may be opened by a switch; external methane gas is added (for avoiding decrease of a methane concentration) and then enters the closed storehouse to form hot air, thereby forming outer-inner hot gas circulation.

As an improvement of the above technical solutions, when the fine coal particles are stacked to the certain height, specifically, a transparent observation window is formed at a position of the outer part of the storehouse opposite to the collecting cavity and the stripper plate; and a gathering state of the coal particles in the collecting cavity can be observed by a worker via the transparent observation window.

As an improvement of the above technical solutions, a high-pressure nitrogen bottle is mounted outside the storehouse and is in signal control connection with a methane concentration alarm device and a centralized control device; in the S2, once the methane concentration inside the storehouse exceeds a set concentration range, the methane concentration alarm device gives an alarm; and the high-pressure nitrogen bottle 1s automatically opened by the centralized control device to rapidly fill nitrogen into the storehouse.

As an improvement of the above technical solutions, an outlet of the exhaust pipe is connected in parallel with a sampling pump; and a bottom outlet of the collecting cavity is connected in parallel with a liquid sampling pipe. The coalbed methane can be extracted by the sampling pump and monitored in real time; and cleanliness of the water can be sampled and observed by the liquid sampling pipe so as to know a screening effect of the level-3 sieve plate.

As shown in Figs. 1-5, an experimental separation apparatus includes a feeding crusher 21. A plurality of groups of separation devices are connected in parallel with an outlet of the feeding crusher 21. The plurality of groups of separation devices are arranged. When more materials are stacked in one separation device, another group of separation devices is operated, thereby ensuring continuous separation. The feeding crusher 21 1s used for crushing transported coal briquettes.

Each of the separation devices includes a storehouse 1; a sealed storehouse door 101 and a feeding pipe 102 are mounted on the top of the storehouse 1; the feeding pipe is communicated with the crusher; and the hinged sealed storehouse door is used for conveniently opening the storehouse by a person.

A level-1 sieve plate 3 is mounted on the top inside each of the storehouses 1; the feeding pipe 102 downwards extends to an inlet end of the level-1 sieve plate 3; a screen surface of the level-1 sieve plate is composed of uniformly distributed mesh holes; according to needs of incoming particles, various screen surfaces such as a string screen surface, a stainless steel filament woven composite screen mesh, a polyurethane screen surface or a slit screen surface can be selected; the level-1 sieve plate is detachable and replaceable; the screen surfaces of different meshes may be selected according to granularity and concentration differences of the incoming mixture; a slope angle of the screen surface can be adjusted, is generally not greater than 15 degrees, and may be a negative degree number when necessary; the level-1 sieve plate has functions of coarsely screening the incoming mixture and separating coarse particles of the coal and the water; the water and the passing coal particles drop into a lower apparatus, and large particles that cannot pass through the sieve flow out of the left side of the screen surface; amplitudes and frequencies are controlled by connected vibration motors outside the storehouse; and the level-1 sieve plate may synchronously vibrate with the level-2 sieve plate under the same frequency and the same amplitude, or may vibrate with the level-2 sieve plate under different frequencies and different amplitudes.

Level-2 sieve plates 5 are arranged at the bottom of the level-1 sieve plates 3 at intervals; according to needs of incoming particles, various screen surfaces of the level-2 sieve plates 5 such as a string screen surface, a stainless steel filament woven composite screen mesh, a polyurethane screen surface or a slit screen surface can be selected; and the apparatus is detachable and replaceable. The screen surfaces of different meshes may be selected according to granularity and concentration differences of the incoming mixture; and amplitudes and frequencies are controlled by connected vibration motors outside the storehouses. The level-2 sieve plate may synchronously vibrate with the level-1 sieve plate under the same frequency and the same amplitude, or may vibrate with the level-1 sieve plate under different frequencies and different amplitudes. The level-2 sieve plate has functions of further finely screening the incoming mixture and separating fine particles of the coal and the water; the water and the passing coal particles drop into a lower apparatus; and large particles that cannot pass through the sieve flow out of the left side.

Level-3 sieve plates 7 are arranged at the bottom of the level-2 sieve plates 5 at intervals, and are detachable and replaceable. The screen surfaces of different meshes may be selected according to granularity and concentration differences of the incoming mixture; the level-3 sieve plate has functions of further finely screening the incoming mixture and separating most of the coal particles; only the water and extremely fine particles pass through the sieve; and the intercepted coal particles will be stored on the tops of the level-3 sieve plates.

Mesh diameters of the level-1 sieve plates 3, the level-2 sieve plates 5 and the level-3 sieve plates 7 are sequentially decreased; and the sequential decrease of the diameter is used for realizing multi-level screening, thereby increasing the separation effect. Moreover, the maximum sieve mesh number may be up to about 120 (i.e., the minimum mesh diameter is about 0.125 mm).

The level-3 sieve plates 7 are rotationally connected with the inner walls of the storehouses 1; the bottoms of the level-3 sieve plates 7 are connected with rotary supporting mechanisms 8; and the rotary supporting mechanisms 8 are used for driving the level-3 sieve plates 7 to rotate. After the coal particles on the tops of the level-3 sieve plates are stacked to a certain amount and completely desorbed, the rotary supporting mechanisms may drive the level-3 sieve plates to downwards rotate, thereby downwards discharging the stacked coal particles. After the coal particles are completely discharged, the rotary supporting mechanisms may drive the level-3 sieve plates to upwards rotate to reset for continuous processing. Therefore, the level-3 sieve plates can stably rotate by virtue of the rotary supporting mechanisms.

An insulation cover 9 is mounted at the bottom of each level-2 sieve plate 5. The insulation cover 9 is used for forming a sustained high temperature chamber, so that the coal particles can be continuously heated and desorbed without interruption. Desorption is a process of releasing an absorbed or adsorbed substance from an absorbent or adsorbent.

Each insulation cover 9 includes a vertical plate 903, a stripper plate 902 and a water baffle 901. The vertical plate 903 is vertically fixed on a bottom surface inside the storehouse 1; the top of the vertical plate 903 is connected with the obliquely upward stripper plate 902; the stripper plate 902 is located at the bottom of an outlet of each level-2 sieve plate 5; an area between the vertical plate 903 and inner walls of the storehouse 1 is communicated to a second discharging hopper; the coal particles discharged by the level-1 sieve plates and the level-2 sieve plates will be gathered to the stripper plate and then flow to the second discharging hopper, thereby realizing discharging diversion of the larger coal particles. Moreover, in the above discharging process, the flowing coal particles will be heated by the high-temperature stripper plate, so as to desorb gases in the larger coal particles.

The top of the stripper plate 902 is connected with the obliquely downward water baffle 901; the water baffle 901 downwards extends to one side on which the level-3 sieve plate 7 is located; the bottom end of the level-3 sieve plate 7 is attached to the surface of the level-3 sieve plate 7; an area encircled between the level-3 sieve plate 7 and the water baffle 901 is the collecting cavity; the bottom of the collecting cavity 1s communicated with a first discharging hopper 10 so as to avoid the water from spilling out, and thus the water and the coal particles can be stably stored in the collecting cavity; the water baffle is a plate that bears the weight and has a certain strength; the lower part of the water baffle is fixed with the storehouse together; the water baffle has functions of enabling a mixture of the coal particles and the water discharged from the level-2 sieve plates to drop along the panel; the coal particles are stacked in the collecting cavity, but finer coal particles and water may smoothly pass through the level-3 sieve plates; and since the stacked coal particles need to be stacked in a certain time, the coal particles can be conveniently heated by the high-temperature water baffle, so that the coalbed methane in the coal particles may be desorbed in sufficient time.

A discharging three-way valve 11 is mounted at an outlet of the first discharging hopper 10; an outlet of the discharging three-way valve 11 is connected in parallel to a fine coal particle discharging pipe 1101 and a slime water discharging pipe 1102; on-off of the fine coal particle discharging pipe 1101 and the slime water discharging pipe 1102 can be controlled by the discharging three-way valve 11; only the slime water discharging pipe 1102 is opened when the water and a small amount of fine coal particles are discharged only; and when the stacked coal particles need to be discharged, the level-3 sieve plates downwards rotate, and only the fine coal particle discharging pipe 1101 is opened.

An insulation pump 13 is mounted inside each insulation cover 9. A second heating panel 9021 is embedded into the surface of the stripper plate 902. A first heating panel 9011 is embedded into the surface of the water baffle 901. Both the first heating panel 9011 and the second heating panel 9021 are communicated to the insulation pump 13, and are used for increasing the temperatures so as to desorb the coalbed methane in the coal particles. The insulation pump can continuously heat an insulation medium, so that the first heating panel and the second heating panel are maintained in a constant high-temperature state; and the coal particles can be heated by the first heating panel and the second heating panel, so that the coalbed methane in the coal particles is desorbed, thereby separating the gas, liquid and the coal particles.

Insulation wool plates 14 are oppositely arranged on the top of the stripper plate 902 in parallel; a high-temperature zone is formed between the insulation wool plates 14 and the stripper plate 902; discharging paths of the level-1 sieve plates 3 and the level-2 sieve plates 5 are located in the high-temperature zone; and the insulation wool plates can avoid heat produced by a second heating wool plate from dissipating upwards, so that the heat is gathered between the insulation wool plates and the stripper plate, thereby increasing a heating effect of the flowing coal particles and desorbing more coalbed methane.

A plurality of groups of hot air generation mechanisms 15 are mounted on the surfaces of the insulation wool plates 14 and used for discharging hot air to the high-temperature zone. The hot air generation mechanisms 15 are used for producing the hot air, so that the heat in the high-temperature zone is higher, and the desorption effect 1s more excellent.

As shown in Fig. 4, each of the hot air generation mechanisms 15 includes an insulated hot-air blower 1501, an air outlet housing 1502, an inner air inlet pipe 1503 and an outer air inlet pipe 1504; the insulated hot-air blower 1501 is mounted on the top of the insulation wool plates 14; and the hot air is produced by the insulated hot-air blower, so that dissipation of the hot air is facilitated, thereby avoiding electric spark and gas explosion.

An outlet of the insulated hot-air blower 1501 is communicated with the air outlet housing 1502; the air outlet housing 1502 is arranged on the bottom surface of the insulation wool plates 14 and is in the shape of a trapezoidal horn; and the air outlet housing of the shape facilitates dissipation and downward blowing of the hot air.

An air inlet of the air outlet housing 1502 is connected in parallel with an inner air inlet pipe 1503 and an outer air inlet pipe 1504; the inner air inlet pipe 1503 is arranged in the storehouse 1; the outer air inlet pipe 1504 outwards extends into the storehouse 1; the coalbed methane desorbed in the storehouse gathers in an upper cavity inside the storehouse; and the coalbed methane can provide the needed gas for the insulated hot-air blower via the inner air inlet pipe. Since the coalbed methane has a certain temperature, the insulated hot-air blower does not need to perform great heating; the energy consumption is lowered; and the desorbed gases can circulate in the storehouse, thereby forming cyclic gas heating. A valve body is located on the inner air inlet pipe and arranged outside the storehouse; and when the gas in the storehouse 1s insufficient, external gas or methane gas may be provided for the insulated hot-air blower, so as to ensure sufficient hot air circulation.

Level-1 sieve plate flushing mechanisms 2 are mounted on the tops of the level-1 sieve plates 3; two side walls of the level-1 sieve plates 3 are in sliding connection with level-2 sieve plate flushing mechanisms 4; the level-2 sieve plate flushing mechanisms 4 are arranged on the tops of the level-2 sieve plates 5; level-3 sieve plate flushing mechanisms 6 are arranged at the bottoms of the level-2 sieve plates 5; and the level-3 sieve plate flushing mechanisms 6 are rotationally mounted on the inner walls of the storehouse 1.

The level-1 sieve plate flushing mechanisms include hydraulic jet rings and hydraulic nozzles. The plurality of hydraulic nozzles are fixed on the hydraulic jet rings according to an equal distance; the nozzles are downwards scattered; the hydraulic nozzles have functions of providing dynamic spray and cleaning the level-1 sieve plates; the hydraulic jet rings are fixed below the sealed storehouse door in a suspended manner; totally 3 groups of the hydraulic jet rings are arranged according to the length of the storehouse, and the number of the groups can be adjusted. The hydraulic jet rings may be rectangular according to a plane structure of the storehouse, and may also be of other shapes, such as a combination of circle or semicircle and rectangle. The plurality of hydraulic nozzles are fixed on each of the rings according to an equal distance; and the rings are connected with external control so as to provide a water source for each hydraulic nozzle; and water power is controlled by an external controller.

As shown in Fig. 2, totally 2 groups of level-2 sieve plate flushing mechanisms are arranged. Each of the level-2 sieve plate flushing mechanisms includes a nozzle 402, a slide bar 401 and a hairbrush 403. One group of the level-2 sieve plate flushing mechanisms is provide with backward hydraulic nozzles and hairbrushes; and the other group of the level-2 sieve plate flushing mechanisms is provided with downward hydraulic nozzles and hairbrushes. The two groups of level-2 sieve plate flushing mechanisms are suspended at outer slots of the level-1 sieve plates and axially penetrate through two sides of the level-1 sieve plates. The nozzles are arranged in parallel in an equal distance according to a certain distance along an axial direction, can rotate by a certain angle around a shaft, and may move back and forth along the outer slots of the level-1 sieve plates; motions of the nozzles are completed by matching with sliding rails 301 and the slide bars 401; and motion speeds are determined by the external controller. The level-2 sieve plate flushing mechanisms have functions of cleaning the level-2 sieve plates and rotating by a certain angle for continuous dynamic cleaning so as to avoid incomplete cleaning. The water jet amount and the jet rate are controlled by the external controller. The hairbrushes 403 are rotary roller-type hairbrushes.

The level-3 sieve plate flushing mechanisms include rotating shafts fixed on inner walls of the storehouse (or may be rigid water pipes, hollowed with water), and hydraulic nozzles. The hydraulic nozzles are communicated with the rigid water pipes and provide water by an external apparatus; and the hydraulic nozzles are arranged in equal distance and can rotate by an angle of about 160°. The water jet amount, the jet rate and the rotation speed are all controlled by the external controller. The level-3 sieve plate flushing mechanisms have functions of rotating downwards to clean the level-3 sieve plates and rotating upwards to clean the bottoms of the level-2 sieve plates.

As shown in Fig. 3, widths of the level-1 sieve plates 3, the level-2 sieve plates and the level-3 sieve plates 7 are increased in sequence; the widths of the level-3 sieve plates 7 are the same as those of the insulation covers 9; and the widths of the insulation covers 9 are smaller than those of the insulation wool plates 14. The widths of the three sieve plates are increased in sequence, so that the screened coal particles can be prevented from being scattered, and thus the dropping coal particles can be completely collected by the lower sieve plate. The area of the insulation cover 1s larger than that of the level-3 sieve plate, so that all the discharged coal particles can be collected. The water baffle and the stripper plate can fully block and guide the media; and the insulation wool plate having a maximum area can achieve an excellent thermal insulation and heat preservation effect.

One end of each of the level-1 sieve plates 3 is rotationally connected to the inner wall of the storehouse 1, and the other end of each of the level-1 sieve plates 3 1s mounted on a level-1 sieve plate buffer mechanism 18; one end of each of the level-2 sieve plates 5 is rotationally connected to the inner wall of the storehouse 1, and the other end of each of the level-2 sieve plates is mounted on a level-2 sieve plate buffer mechanism 19; the level-1 sieve plate buffer mechanism 18 is mounted on the outer side of the level-2 sieve plate buffer mechanism 19; the level-1 sieve plate buffer mechanism 18 includes an upper fixing rack 1801, a spring 1803, a lower fixing rack 1804 and installation blocks 1802; the top end of the lower fixing rack 1s connected with the spring; the top end is connected with the upper fixing rack; the plurality of installation blocks are arranged on inner walls of the upper fixing rack; the outer walls of the level-1 sieve plates are connected with the installation blocks by screws; the structures of the level-2 sieve plate buffer mechanism and the level-1 sieve plate buffer mechanism are the same; and a size of the level-2 sieve plate buffer mechanism is smaller than that of the level-1 sieve plate buffer mechanism. By utilizing the sieve plate buffer mechanisms, the level-1 sieve plates and the level-2 sieve plates may more stably sway, and thus service life is prolonged. Moreover, according to design of the plurality of installation blocks, inclination angles of the sieve plates can be conveniently adjusted by experimenters, so as to determine an optimal separation angle of the coal briquettes.

The rotary supporting mechanism 8 includes an electric hydraulic rod 801, guide rails 802 and a telescopic support rod 803. One end of the electric hydraulic rod 801 1s connected with the inner wall of the storehouse 1, and the other end of the electric hydraulic rod 801 is rotationally connected with the level-3 sieve plate 7; the guide rails 802 are arranged on two side walls of the level-3 sieve plate 7; the bottom end of the telescopic support rod 803 is rotationally connected to a side wall at the bottom end of the water baffle 901; the top end of the telescopic support rod 803 is rotationally connected with a slide block; and the slide block is embedded into the guide rails 802. The electric hydraulic rod can drive the level-3 sieve plate to rotate up and down; and during rotation, the level-3 sieve plate will drive the slide block to move along the guide rails, while the telescopic rod makes a telescopic motion and rotates and can support the level-3 sieve plate from the bottom, thereby ensuring stable rotation of the level-3 sieve plate and avoiding the coal particles stacked by the level-3 sieve plate from being crushed.

A first temperature sensor 1s embedded into the surface of the stripper plate 902; a second temperature sensor 1s mounted on a side wall of the air outlet housing 1502; a methane concentration monitor, a gas temperature monitor, a gas humidity monitor and an air pressure monitor are mounted on the top of the side walls of the storehouse 1; the first temperature sensor, the second temperature sensor, the methane concentration monitor, the gas temperature monitor, the gas humidity monitor and the air pressure monitor are all electrically connected to a monitoring host box 12; the first temperature sensor can monitor the surface temperature of the stripper plate; the second temperature sensor can monitor a temperature of the blowing hot air; the methane concentration monitor 1s used for monitoring methane concentration variation in the storehouse and has an alarm function according to setting conditions; and the gas temperature monitor, the gas humidity monitor and the air pressure monitor are used for monitoring the air pressure and the gas temperature so as to discharge the gas in time, thereby ensuring safety of the storehouse.

During implementation in the present invention: All pipelines are completely connected, and various inlets and outlets are closed to check the sealing property of the apparatus and whether the monitoring device can normally work.

A mixture inlet pipe 20 1s opened; the mixture 1s crushed in a feeding crusher 21 and then discharged into one storehouse 1; and various devices in the storehouse start working normally.

The mixture drops onto the level-1 sieve plate 3 through a feeding pipe 102. Due to high-frequency vibration of the mesh (capable of vibrating up and down and from side to side), coarse coal particles are reserved; fine coal particles and water enter the level-2 sieve plate 5; and the coarse coal particles enter the left lower stripper plate 902 along the level-1 sieve plate 3. Then, the fine coal particles and the water enter the level-2 sieve plate 5; and most of the fine coal particles also enter the stripper plate 902 along a slope of the mesh due to high-frequency vibration of the level-2 sieve plate 5. The materials on the stripper plate 902 will downwards slide to enter a second discharging hopper 23 on the left lower side; then, the refiner coal particles and most of the water drop into a collecting cavity encircled by the water baffle 901 and the level-3 sieve plate 7 by the level-2 sieve plate 5; and the water passes through the level-3 sieve plate 7 and is finally discharged from slime water discharging pipe, while the fine coal particles are continuously stored in the collecting cavity.

In the above screening process, the insulation pump 13 and the insulated hot-air blower 1501 simultaneously work; and heat-conducting media (such as water and gases) are heated by the insulation pump 13, so that the first heating panel 9011 and the second heating panel 9021 are kept in a high-temperature state; and the fine coal particles that continuously gather in the collecting cavity are heated by the first heating panel 9011, so as to desorb the coalbed methane in the fine coal particles. A blanking area on the top is heated by the second heating panel 9021; the insulated hot-air blower 1501 discharges hot air to heat a blanking area at the bottom; and the insulation wool plate 14 can avoid upward dissipation of the heat, so that a high-temperature blanking area is formed between the insulation wool plate 14 and the stripper plate 902; and the large coal particles and the small coal particles flowing through the high-temperature blanking area will be rapidly heated, so as to rapidly desorb most of the coalbed methane inside the area. Moreover, the desorbed coalbed methane will rise to the top of the storehouse, and is finally discharged to a coalbed methane treatment tank 17 via an exhaust pipe 16, dried and then discharged and collected.

When the fine coal particles in the collecting cavity are stacked to a certain height and cannot be continuously stacked, a channel of another storehouse 1 is opened by a feeding three-way valve 22, so that the crushed coal is discharged into the another storehouse to be screened; by virtue of a discharging three-way valve 11, the fine coal particle discharging pipe 1101 is opened and the slime water discharging pipe 1102 is closed; then, the electric hydraulic rod 801 drives the level-3 sieve plate 7 to downwards rotate, the telescopic support rod 803 contracts and rotates, the level-3 sieve plate 7 rotates to depart from the water baffle 901, and the fine coal in the collecting cavity will drop and flow to the fine coal particle discharging pipe 1101; and after the coal in the collecting cavity is completely discharged, the fine coal particle discharging pipe 1101 is closed and the slime water discharging pipe 1102 is opened, and the electric hydraulic rod 801 drives the level-3 sieve plate 7 to upwards rotate to reset, so as to block the collecting cavity again.

All the hydraulic jet apparatuses can be independently adjusted by the external controller of the storehouse and can control the water volume and water power; and partial jet directions and angles are adjusted for effective cleaning, so as to achieve a research purpose. During operation, if the mesh is not blocked, separation may be effectively conducted, and then the hydraulic nozzles can be closed by the external controller.

If the level-1 sieve plate is blocked, the whole mesh surface can be sprayed by opening the hydraulic nozzles (fixing apparatuses) carried by the upper hydraulic jet rings, so as to unblock the mesh. Each of the hydraulic jet rings may be independently controlled to be opened and closed, so as to facilitate experimental test and effect contrast.

If the level-2 sieve plate 1s blocked, the level-2 sieve plate flushing mechanism 4 can be opened (power of the level-2 sieve plate flushing mechanism is controlled by an external motor). Cleaning may be conducted during separation or when separation is stopped. During cleaning, hydraulic jet can be realized by controlling each separate external controller. The hairbrush 403 rotates closer to the level-2 sieve plate during cleaning, has a similar function of sweeping the floor, and cleans the level-2 sieve plate (the rotation speed is controlled by the external controller); and the hairbrush can move back and forth along the direction of the sieve plate.

If the level-3 sieve plate 1s blocked, the level-3 sieve plate flushing mechanism 6, that is, a rotatable flushing nozzle, can be opened. The level-3 sieve plate flushing mechanism rotates downwards to flush the level-3 sieve plate and rotates upwards to flush the level-2 sieve plate.

If instruments fail and need to be repaired, or serious mesh blockage occurs, or it takes longer separation time to replace each mesh according to experimental results, a control valve 42 outside the storehouse is controlled, a channel leading to the first storehouse is closed, and a channel leading to the second storehouse is opened, thereby ensuring continuous separation of the mixture. Then, the sealed storehouse door can be opened, and components in the storehouse are repaired or replaced or cleaned.

All used motors have different vibration frequencies and amplitudes. Components of the monitoring apparatuses that control heat energy, electric energy, the rotation speed, slip velocity, hydraulic power and flow velocity as well as the humidity, concentrations and temperatures of the gases are all communicated with an external control cabinet so as to realize intelligent integrated control.

A centralized drainage apparatus shall be provided with a drainage valve, because gas entering from the pipeline may be mixed with water vapor. The water vapor 1s condensed into liquid water and then discharged into a gas collection apparatus, so that a water level rises. When the water level rises to a threshold, excessive water needs to be drained by opening the valve.

The above only describes preferred embodiments of the present invention and is not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and the principle of the present invention shall be contained within the protection scope of the present invention.

Claims (7)

1. I.

   An experimental method for continuous separation of a mixture of gas-containing coal and water, comprising the following steps:

   sl, pre-adjustment before the experiment:

   judging granularity of solid-phase coal particles in the mixture; determining a mesh number and an inclination angle of a sieve plate of each level; and replacing and adjusting the sieve plate of each level,

   extracting gases in a storehouse by a vacuum pump, so that the interior of the storehouse 1s in a vacuum state;

   s2, separation and desorption experiments of the mixture:

   discharging the mixture of the gas-containing coal and the water into the storehouse by a feeding pipe;

   screening the mixture by a level-1 sieve plate and a level-2 sieve plate; screening out larger coal particles and enabling the larger coal particles to flow to a stripper plate so as to be finally discharged out of the storehouse; downwards discharging fine coal particles and water into a V-shaped collecting cavity encircled by a water baffle and a level-3 sieve plate; heating the coal particles that flow through the stripper plate by a first heating mechanism outside the stripper plate during discharging so as to desorb coalbed methane;

   enabling the water to pass through the level-3 sieve plate; discharging the water out of the storehouse by a slime water discharging pipe; continuously gathering the fine coal particles in the collecting cavity; heating the coal particles in the collecting cavity by a second heating mechanism on the water baffle during gathering so as to desorb the coalbed methane;

   downwards rotating the level-3 sieve plate when the fine coal particles are stacked to a certain height; and discharging the fine coal particles out of the storehouse by a fine coal particle discharging pipe;

   s3, experimental post-treatment:

   discharging the coalbed methane that rises to the top of the storehouse to a coalbed methane treatment tank by an exhaust pipe; cleaning the sieve plates by cleaning mechanisms on the tops of the sieve plates of all levels.
2. 2. The experimental method for continuous separation of the mixture of gas-containing coal and water according to claim 1, wherein the step that the coal particles flowing through the stripper plate are heated and desorbed by the first heating mechanism is specifically as follows: the first heating mechanism comprises a second heating panel located inside the stripper plate and hot air generation mechanisms located on the top of the stripper plate at intervals; when flowing through the stripper plate, the coal particles are heated by the second heating panel from the bottom; and the hot air generation mechanisms blow out hot air from the tops, so that the coal particles are rapidly heated and the coalbed methane inside the coal particles is fully desorbed.
3. 3. The experimental method for continuous separation of the mixture of gas-containing coal and water according to claim 2, wherein each of the hot air generation mechanisms comprises an insulated hot-air blower; the heated gases are discharged downwards by the insulated hot-air blower; two air inlets are communicated at an inlet of the insulated hot-air blower; one air inlet 1s formed in the storehouse; the other air inlet extends out of the storehouse and is communicated with a methane tank; a major gas source of the insulated hot-air blower is the coalbed methane inside the storehouse, so that the storehouse is in a vacuum state; and when the coalbed methane in the storehouse is insufficient, external gases are provided.
4. 4. The experimental method for continuous separation of the mixture of gas-containing coal and water according to claim 1, wherein the step that the coal particles in the collecting cavity are heated by the second heating mechanism is specifically as follows: the second heating mechanism comprises a first heating panel located inside the water baffle; and in a process of continuously gathering the fine coal particles in the collecting cavity, the fine coal particles may be continuously heated by the first heating panel, so that the coalbed methane in the coal particles is desorbed.
5. 5. The experimental method for continuous separation of the mixture of gas-containing coal and water according to claim 1, wherein when the fine coal particles are stacked to the certain height, specifically, a transparent observation window is formed at a position of the outer part of the storehouse opposite to the collecting cavity and the stripper plate; and a gathering state of the coal particles in the collecting cavity can be observed by a worker via the transparent observation window.
6. 6. The experimental method for continuous separation of the mixture of gas-containing coal and water according to claim 1, wherein a high-pressure nitrogen bottle is mounted outside the storehouse and is in signal control connection with a methane concentration alarm device and a centralized control device; in the s2, once the methane concentration inside the storehouse exceeds a set concentration range, the methane concentration alarm device gives an alarm; and the high-pressure nitrogen bottle 1s automatically opened by the centralized control device to rapidly fill nitrogen into the storehouse.
7. 7. The experimental method for continuous separation of the mixture of gas-containing coal and water according to claim 1, wherein an outlet of the exhaust pipe is connected in parallel with a sampling pump; and a bottom outlet of the collecting cavity is connected in parallel with a liquid sampling pipe.