CN109187267B - Experimental device and experimental method for water immersion pulverized coal adsorption and desorption - Google Patents
Experimental device and experimental method for water immersion pulverized coal adsorption and desorption Download PDFInfo
- Publication number
- CN109187267B CN109187267B CN201811149419.8A CN201811149419A CN109187267B CN 109187267 B CN109187267 B CN 109187267B CN 201811149419 A CN201811149419 A CN 201811149419A CN 109187267 B CN109187267 B CN 109187267B
- Authority
- CN
- China
- Prior art keywords
- desorption
- tank
- water
- measuring cylinder
- pipe
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000003795 desorption Methods 0.000 title claims abstract description 237
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 128
- 239000003245 coal Substances 0.000 title claims abstract description 58
- 238000001179 sorption measurement Methods 0.000 title claims abstract description 33
- 238000007654 immersion Methods 0.000 title claims abstract description 22
- 238000002474 experimental method Methods 0.000 title claims description 25
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 48
- 238000002347 injection Methods 0.000 claims abstract description 36
- 239000007924 injection Substances 0.000 claims abstract description 36
- 238000000034 method Methods 0.000 claims abstract description 22
- 239000001307 helium Substances 0.000 claims abstract description 16
- 229910052734 helium Inorganic materials 0.000 claims abstract description 16
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000007789 sealing Methods 0.000 claims description 52
- 238000003756 stirring Methods 0.000 claims description 40
- 239000007789 gas Substances 0.000 claims description 32
- 239000007788 liquid Substances 0.000 claims description 21
- 238000000605 extraction Methods 0.000 claims description 18
- 238000005485 electric heating Methods 0.000 claims description 12
- 238000007599 discharging Methods 0.000 claims description 9
- 238000011049 filling Methods 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 8
- 230000000149 penetrating effect Effects 0.000 claims description 6
- 238000009413 insulation Methods 0.000 claims description 5
- 239000000843 powder Substances 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 230000009467 reduction Effects 0.000 claims description 3
- 238000004088 simulation Methods 0.000 claims description 3
- 239000000344 soap Substances 0.000 claims description 3
- 230000008569 process Effects 0.000 abstract description 13
- 230000002706 hydrostatic effect Effects 0.000 abstract description 5
- 239000002245 particle Substances 0.000 abstract description 5
- 238000010998 test method Methods 0.000 abstract 1
- 238000005553 drilling Methods 0.000 description 6
- 239000002817 coal dust Substances 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 101100298222 Caenorhabditis elegans pot-1 gene Proteins 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N7/00—Analysing materials by measuring the pressure or volume of a gas or vapour
- G01N7/02—Analysing materials by measuring the pressure or volume of a gas or vapour by absorption, adsorption, or combustion of components and measurement of the change in pressure or volume of the remainder
- G01N7/04—Analysing materials by measuring the pressure or volume of a gas or vapour by absorption, adsorption, or combustion of components and measurement of the change in pressure or volume of the remainder by absorption or adsorption alone
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N7/00—Analysing materials by measuring the pressure or volume of a gas or vapour
- G01N7/14—Analysing materials by measuring the pressure or volume of a gas or vapour by allowing the material to emit a gas or vapour, e.g. water vapour, and measuring a pressure or volume difference
Landscapes
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Combustion & Propulsion (AREA)
- Engineering & Computer Science (AREA)
- Dispersion Chemistry (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses a water immersion pulverized coal adsorption and desorption experimental device and a test method, wherein the experimental device comprises a desorption tank, a measuring cylinder, a helium bottle, a methane bottle, a water injection pump and a vacuum pump; the measuring cylinder is vertically arranged, a high-pressure hose is arranged on the measuring cylinder, a top cover is arranged at the top end of the measuring cylinder, an air suction pipe is connected to the top cover in a pluggable mode, a spiral clamp is arranged on the air suction pipe, and an air suction ball is arranged at one end, far away from the top cover, of the air suction pipe. The water immersion pulverized coal adsorption and desorption experimental device provided by the invention can simulate the desorption conditions of pulverized coal particles under different hydrostatic pressures, the experimental data are accurate, and in the experimental process, each experimental instrument and each pipeline can be rapidly switched, so that the operation is greatly simplified, and the experimental accuracy is ensured.
Description
Technical Field
The invention relates to the technical field of coal bed gas and coal development, in particular to a water immersion pulverized coal adsorption and desorption experimental device and an experimental method.
Background
The interaction mechanism of coal and gas is a basic scientific problem of research in the field of gas disaster prevention and control, and the research on the interaction mechanism of coal and gas not only has a guiding effect on the research on the dynamic disaster mechanism of mine coal and rock gas, but also provides important theoretical support for coal bed gas extraction.
At present, various drilling holes (ground drilling holes, coal seam drilling holes, top and bottom plate penetrating drilling holes, adjacent layer penetrating drilling holes, goaf drilling holes and the like) are utilized to extract the coal seam gas before or during the coal seam exploitation, and measures such as hydraulic power or blasting are used for increasing the air permeability of the coal seam if necessary, so that the coal seam gas extraction amount is improved. It is therefore necessary to study the desorption of coal fines under different hydraulic conditions. How to design an experimental device and an experimental method for water immersion pulverized coal adsorption and desorption is the technical problem to be solved by the invention.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an experimental device and an experimental method aiming at water immersion pulverized coal adsorption and desorption.
The invention solves the technical problems by the following technical means:
an experimental device for water immersion pulverized coal adsorption and desorption comprises a desorption tank, a measuring cylinder, a helium bottle, a methane bottle, a water injection pump and a vacuum pump; the measuring cylinder is vertically arranged, a high-pressure hose is arranged on the measuring cylinder, a top cover is arranged at the top end of the measuring cylinder, an air suction pipe is connected to the top cover in a pluggable mode, a spiral clamp is arranged on the air suction pipe, and an air suction ball is arranged at one end, far away from the top cover, of the air suction pipe; the desorption tank is connected with a water inlet pipe, a desorption pipe and an exhaust pipe in a pluggable manner, and the desorption pipe is provided with a flowmeter; the exhaust pipe is connected with the vacuum pump in a pluggable manner; the desorption pipe is provided with a first quick adapter at one end far away from the desorption tank, and the desorption pipe can be connected with a methane bottle and a high-pressure hose in a convertible way through the first quick adapter; the end, far away from the desorption tank, of the water inlet pipe is provided with a second quick switching joint, and the water inlet pipe can be connected with a helium bottle, a water injection pump and a high-pressure hose in a switching way through the second quick switching joint; the high pressure hose and the water injection pump may be connected by a second quick disconnect coupling.
Preferably, the water immersion pulverized coal adsorption and desorption experimental device comprises a desorption outer tank, a desorption inner tank, a disk with holes, a stirring device, a water level monitor and a desorption tank sealing cover; the desorption inner tank is arranged in the desorption outer tank, the desorption outer tank and the desorption inner tank are of cylindrical structures with the upper ends open and the lower ends closed, the desorption tank sealing cover is hinged to the upper end of the desorption outer tank, the perforated circular disc is arranged between the desorption inner tank and the desorption tank sealing cover, and the stirring device and the water level monitor are arranged in the desorption inner tank; an oil bath cavity is reserved between the desorption inner tank and the desorption outer tank, oil bath liquid is filled in the oil bath cavity, an electric heating device is arranged in the oil bath cavity, the electric heating device is an electric heating wire, a socket is arranged on the desorption outer tank, the socket is connected with the electric heating device, and a heat insulation layer is arranged on the inner wall of the desorption outer tank.
Preferably, in the water immersion pulverized coal adsorption and desorption experimental device, a hinge is arranged on a desorption tank sealing cover, and the desorption tank sealing cover is hinged with the desorption outer tank through the hinge; the desorption tank sealing cover is provided with an elastic switch, the elastic switch is positioned at the other side of the desorption tank sealing cover relative to the hinge, and the desorption tank sealing cover is connected with the desorption outer tank in an openable manner through the elastic switch; the upper surface of the desorption tank sealing cover is provided with a thermometer and a pressure gauge; the desorption tank sealing cover is provided with a water injection hole, a desorption hole and an air extraction hole which penetrate through the desorption tank sealing cover, and the water injection hole, the desorption hole and the air extraction hole are respectively and correspondingly connected with the water inlet pipe, the desorption pipe and the air extraction pipe.
Preferably, in the water immersion pulverized coal adsorption and desorption experimental device, three through holes penetrating through the perforated disc are formed in the perforated disc, the three through holes are respectively communicated with a water injection hole, a desorption hole and an air suction hole, and filter screens are arranged in the air suction holes and the corresponding through holes; the stirring device comprises a stirring rod, the stirring rod is vertically arranged, a stirring motor is arranged on the perforated disc, the top end of the stirring rod is connected with the stirring motor, and stirring blades are arranged at the bottom end of the stirring rod; the top end of the water level monitor is fixed on the perforated disc, and the lower end of the water level monitor stretches into the desorption inner tank.
Preferably, the water logging pulverized coal adsorption and desorption experimental device is characterized in that a measuring cylinder seat is arranged at the bottom end of the measuring cylinder, a containing groove is formed in the measuring cylinder seat, the bottom end of the measuring cylinder is fixed in the containing groove, and a water outlet is formed in the position, close to the bottom end, of the measuring cylinder.
Preferably, the experimental device for water immersion pulverized coal adsorption and desorption further comprises a rapid plug-in device, wherein the desorption pot is connected with the water inlet pipe, the desorption pipe and the exhaust pipe in a plug-in manner through the rapid plug-in device; the quick plug device comprises a fixed end and a quick plug end, wherein the fixed end is fixed on the desorption pot, the fixed end is communicated with the corresponding water injection hole, the desorption hole and the air exhaust hole, and the quick plug end is fixed on the corresponding water inlet pipe, the corresponding desorption pipe or the corresponding air exhaust pipe; the fixed end include sealed pad, sealed pad in install female joint and jump ring, the jump ring be located female joint directly over portion, sealed upper end of filling up install O type sealed cushion, quick plug end include hollow bolt, hollow bolt in install the male joint, male joint and hollow bolt between install O type sealed cushion, the lower extreme of male joint be provided with jump ring complex draw-in groove.
Preferably, the air suction pipe, the top cover, the air suction pipe and the vacuum pump are connected in a pluggable manner through the rapid plug-in device.
An experimental method of an experimental device for water immersion pulverized coal adsorption and desorption comprises the following steps:
(1) And (3) checking tightness: pressing an elastic switch at a sealing cover of the desorption tank, sealing the desorption tank, pressurizing the inside of the desorption tank to 2Mpa through a desorption port by utilizing an air pump, smearing soap liquid at each quick plug interface on the desorption tank, observing whether bubbles are generated, and ensuring that the pressure reduction of the pressure in 30 minutes accords with the tightness required by an experiment according to the pressure value before and after gas injection of a pressure gauge, so that the tightness of the experimental device before the experiment meets the experimental standard;
(2) Placing a sample, calibrating the volume: placing the screened pulverized coal into an desorption inner tank, closing an elastic switch, connecting a helium bottle and a water injection hole with a second quick adapter, and injecting helium into the desorption inner tank to calibrate the volume of the pulverized coal;
(3) Simulation adsorption: pumping helium to vacuum through a vacuum pump, connecting a methane bottle and a desorption pipe with a first quick adapter, injecting methane into a desorption inner tank, enabling a coal sample in the desorption inner tank to reach adsorption balance at a set temperature and pressure, keeping the adsorption balance time at least 8 hours, and recording and calculating volume data and the set temperature and pressure;
(4) And (3) filling water into a measuring cylinder: connecting a high-pressure hose, a water injection pump and a second quick adapter, filling water into a measuring cylinder, unscrewing a spiral clamp, sucking the liquid level in the measuring cylinder to the liquid level of a scale (0 scale is positioned at the uppermost end of the measuring cylinder) through operating a suction ball, screwing the spiral clamp in the opposite direction, and sealing the high-pressure hose and the measuring cylinder;
(5) And (3) coal powder desorption: connecting a water injection pump, a water inlet pipe and a second quick adapter, injecting water into a desorption inner tank, observing through a water level monitor until pulverized coal is liquid sealed, re-adsorbing and balancing the liquid sealed coal sample for not less than 8 hours, rapidly discharging methane gas above the liquid level in the desorption inner tank to the pressure in the desorption inner tank through a desorption pipe to be normal pressure, recording the volume of water and the volume of discharged methane gas, starting a stirring device at the moment, and heating the oil bath through a heater until the temperature required by desorption is reached; connecting a high-pressure hose and a desorption pipe with a first quick adapter, discharging water from a measuring cylinder through a water outlet by using gas, and collecting the gas into the measuring cylinder by using a water and gas discharging method; recording the reading and detection time of the measuring cylinder at certain intervals, and continuously observing for 120 min; the specified reading interval time is as follows: within 60min before the observation is started, the interval from the first point to the third point is 1-2min, and the reading is carried out every 2-5min later; readings are taken every interval of 10-20min for 60-120 min.
The invention has the advantages that: the water immersion pulverized coal adsorption and desorption experimental device provided by the invention can simulate the desorption conditions of pulverized coal particles under different pressure conditions, the experimental data are accurate, each experimental instrument and each pipeline can be rapidly switched in the experimental process, the operation is greatly simplified, the hydrostatic pressure can be regulated by changing the immersion height, and the desorption conditions of pulverized coal particles under different hydrostatic pressure conditions in water immersion can be observed.
Further, the desorption tank is designed into a double-layer structure, an oil bath cavity is designed between the double-layer structure, and because the inside of the desorption inner tank is heated in the experimental process, the heating temperature is high and can exceed 100 ℃, the heating is uniform, the heat insulation layer is arranged on the inner wall of the desorption outer tank, the heat dissipation of the heat of the oil bath is reduced, the heat utilization rate is improved, and the energy is saved.
Drawings
Fig. 1 is a schematic structural view of the present invention.
FIG. 2 is a schematic diagram of the structure of the desorber tank of the present invention.
FIG. 3 is a schematic structural view of a desorber seal cap according to the present invention.
Fig. 4 is a schematic structural view of the perforated disc of the present invention.
Fig. 5 is a schematic structural diagram of the quick plugging device of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
An experimental device for water immersion pulverized coal adsorption and desorption comprises a desorption tank 1, a measuring cylinder 2, a helium bottle 3, a methane bottle 4, a water injection pump 5 and a vacuum pump 6; the measuring cylinder 2 is vertically arranged, a high-pressure hose 7 is arranged on the measuring cylinder 2, a top cover 8 is arranged at the top end of the measuring cylinder 2, an air suction pipe 9 is connected onto the top cover 8 in a pluggable manner, a spiral clamp 10 is arranged on the air suction pipe 9, and an air suction ball 11 is arranged at one end, far away from the top cover 8, of the air suction pipe 9; the desorption tank 1 is connected with a water inlet pipe 12, a desorption pipe 13 and an exhaust pipe 14 in a pluggable manner, and a flowmeter 15 is arranged on the desorption pipe 13; the exhaust pipe 14 is connected with the vacuum pump 6 in a pluggable manner; a first quick switching joint 16 is arranged at one end of the desorption tube 13 far away from the desorption tank 1, and the desorption tube 13 can be connected with the methane bottle 4 and the high-pressure hose 7 in a switching way through the first quick switching joint 16; a second quick-change connector 17 is arranged at one end of the water inlet pipe 12 far away from the desorption tank 1 (the first quick-change connector and the second quick-change connector are all commonly used in the prior art), and the water inlet pipe 12 can be connected with the helium bottle 3, the water injection pump 5 and the high-pressure hose 7 in a switching way through the second quick-change connector 17; the high pressure hose 7 and the water injection pump 5 may be connected by a second quick connect 17.
Preferably, the desorption tank 1 comprises a desorption outer tank 18, a desorption inner tank 19, a perforated circular disk 20, a stirring device 21, a water level monitor 22 and a desorption tank sealing cover 23; the desorption inner tank 19 is arranged in the desorption outer tank 18, the desorption outer tank 18 and the desorption inner tank 19 are of cylindrical structures with open upper ends and closed lower ends, the desorption tank sealing cover 23 is hinged to the upper end of the desorption outer tank 18, the perforated circular disc 20 is arranged between the desorption inner tank 19 and the desorption tank sealing cover 23, and the stirring device 21 and the water level monitor 22 are arranged in the desorption inner tank 19; an oil bath cavity 24 is reserved between the desorption inner tank 19 and the desorption outer tank 18, oil bath liquid is filled in the oil bath cavity 24, an electric heating device 25 is arranged in the oil bath cavity 24, the electric heating device 25 is an electric heating wire, a socket 26 is arranged on the desorption outer tank 18, the socket 26 is connected with the electric heating device 25, and a heat insulation layer 27 is arranged on the inner wall of the desorption outer tank 18.
The desorption tank is designed into a double-layer structure, an oil bath cavity is designed between the double-layer structure, and because the inside of the desorption inner tank is heated in the experimental process, the oil bath is adopted for heating, the heating temperature is high and can exceed 100 ℃, the heating is uniform, the heat insulation layer is arranged on the inner wall of the desorption outer tank, the heat dissipation of the heat of the oil bath is reduced, the heat utilization rate is improved, and the energy is saved.
Preferably, a hinge 28 is installed on the desorption tank sealing cover 23, and the desorption tank sealing cover 23 is hinged with the desorption outer tank 18 through the hinge 28; an elastic switch 29 is arranged on the desorption tank sealing cover 23, the elastic switch 29 is positioned on the other side of the desorption tank sealing cover 23 relative to the hinge 28, and the desorption tank sealing cover 23 is connected with the desorption outer tank 18 in an openable manner through the elastic switch 29; the upper surface of the desorption tank sealing cover 23 is provided with a thermometer 30 and a pressure gauge 31; the desorption tank sealing cover 23 is provided with a water injection hole 32, a desorption hole 33 and an air extraction hole 34 which penetrate through the desorption tank sealing cover, and the water injection hole 32, the desorption hole 33 and the air extraction hole 34 are respectively and correspondingly connected with the water inlet pipe 12, the desorption pipe 13 and the air extraction pipe 14.
The desorption tank sealing cover consists of a flat cylinder, is positioned at the upper part of the perforated circular disk and covers and seals the perforated circular disk, so that experiments can be carried out under different pressures; the hinge is positioned between the outer wall of the desorption tank and the sealing cover of the desorption tank and is used for connecting the outer wall of the desorption tank and the sealing cover of the desorption tank; the elastic switch is positioned at the other side of the desorption tank sealing cover relative to the hinge, a spring is embedded in the elastic switch to ensure the occlusion of the upper toothed column, an ellipsoidal button is arranged at the upper part of the elastic switch, and the button is pressed to enable the inner part of the toothed column to shrink and separate from the spring, so that the desorption tank sealing cover and the outer wall of the desorption tank are separated and opened around the hinge;
preferably, three through holes 35 penetrating through the perforated disc are formed in the perforated disc 20, the three through holes 35 are respectively and correspondingly communicated with the water injection hole 32, the desorption hole 33 and the air extraction hole 34, and a filter screen 36 is arranged in each air extraction hole 34 and the corresponding through hole 35; the stirring device 21 comprises a stirring rod 37, the stirring rod 37 is vertically arranged, a stirring motor 38 is arranged on the perforated circular disc 20, the top end of the stirring rod 37 is connected with the stirring motor 38, and a stirring blade 39 is arranged at the bottom end of the stirring rod 37; the top end of the water level monitor 22 is fixed on the perforated circular disk 20, and the lower end of the water level monitor 22 extends into the desorption inner tank 19.
The perforated disc is mainly positioned between the desorption inner tank and the desorption tank sealing cover, on one hand, three through holes penetrating the perforated disc are formed in the perforated disc, the aperture of each through hole is respectively matched with the water injection hole, the desorption hole and the air extraction hole, and two stirring motors are arranged in the hollow part of the perforated disc and are connected with stirring paddles through stirring rods; the stirring device is arranged on the main body part of the circular disc with the holes, and a lifting structure can be designed for the stirring device in the experiment, so that different amounts of coal dust are always in a uniform mixing state in the stirring process, and the improvement of the experiment accuracy is facilitated; the water level monitor is used for detecting the water level in the desorption inner tank, water is required to be injected into the desorption inner tank in a desorption experiment, after a large amount of water is injected in an initial stage, coal dust and water are required to be uniformly mixed in the experiment process, the stirring device on the perforated disc starts to work, the volume obtained after the coal dust and the water are mixed is smaller than the original volume of the coal dust and the water, the water level monitor can obtain the real empty volume in the desorption inner tank after the coal dust and the water are mixed, the volume of reaction in a state equation is determined in the simulated adsorption process, and meanwhile, the reaction required volume is larger than the actual volume of the desorption inner tank due to a large amount of water injection in the experiment period, so that the damage of the device is prevented.
Preferably, a measuring cylinder seat 40 is mounted at the bottom end of the measuring cylinder 2, a containing groove 41 is formed in the measuring cylinder seat 40, the bottom end of the measuring cylinder 2 is fixed in the containing groove 41, and a water outlet 42 is formed in a position, close to the bottom end, of the measuring cylinder 2.
The measuring cylinder seat is installed to the measuring cylinder bottom, is used for stabilizing the measuring cylinder on the one hand, and on the other hand when collecting the measuring cylinder with the drainage collection method in with gas, gas will water discharge the measuring cylinder through the outlet, and the holding tank on the measuring cylinder seat can collect the exhaust water.
Preferably, the experimental device further comprises a quick plug-in device, and the desorption pot 1 is connected with the water inlet pipe 12, the desorption pipe 13 and the exhaust pipe 14 in a plug-in manner through the quick plug-in device; the quick plug device comprises a fixed end 43 and a quick plug end 44, wherein the fixed end 43 is fixed on the desorption tank 1, the fixed end 43 is communicated with the corresponding water injection hole 32, the desorption hole 33 and the air extraction hole 34, and the quick plug end 44 is fixed on the corresponding water inlet pipe 12, the desorption pipe 13 or the air extraction pipe 14; the fixed end 43 comprises a sealing gasket 45, a female joint 46 and a clamping spring 47 are arranged in the sealing gasket 45, the clamping spring 47 is positioned at the right upper part of the female joint 46, an O-shaped sealing rubber pad 48 is arranged at the upper end of the sealing gasket 45, the quick plugging end 44 comprises a hollow bolt 49, a male joint 50 is arranged in the hollow bolt 49, an O-shaped sealing rubber pad 48 is arranged between the male joint 50 and the hollow bolt 49, and a clamping groove 51 matched with the clamping spring 47 is arranged at the lower end of the male joint 50; the air suction pipe 9, the top cover 8, the air suction pipe 14 and the vacuum pump 6 are connected in a pluggable way through a quick plug-in device.
The quick plugging device has a simple structure, can be used for quickly connecting various experimental instruments and pipelines, provides convenience for connection switching of the instruments and the pipelines in experiments, and ensures continuity and accuracy of the experiments.
The water immersion pulverized coal adsorption and desorption experimental device provided by the invention can simulate the desorption conditions of pulverized coal particles under different pressure conditions, the experimental data are accurate, each experimental instrument and each pipeline can be rapidly switched in the experimental process, the operation is greatly simplified, the hydrostatic pressure can be regulated by changing the immersion height, and the desorption conditions of pulverized coal particles under different hydrostatic pressure conditions in water immersion can be observed.
An experimental method of an experimental device for water immersion pulverized coal adsorption and desorption comprises the following steps:
(1) And (3) checking tightness: pressing an elastic switch at a sealing cover of the desorption tank, sealing the desorption tank, pressurizing the inside of the desorption tank to 2Mpa through a desorption port by utilizing an air pump, smearing soap liquid at each quick plug interface on the desorption tank, observing whether bubbles are generated, and ensuring that the reduction of the pressure within 30 minutes accords with the tightness required by an experiment according to the pressure value before and after gas injection of a pressure gauge, so that the tightness of the experimental device before the experiment meets the test standard;
(2) Placing a sample, calibrating the volume: placing the treated coal powder into an desorption inner tank, closing an elastic switch, connecting a helium bottle and a water injection hole with a second quick adapter, and injecting helium into the desorption inner tank to calibrate the volume of the coal powder;
(3) Simulation adsorption: pumping helium to vacuum through a vacuum pump, connecting a methane bottle and a desorption pipe with a first quick adapter, injecting methane into a desorption inner tank, enabling a coal sample in the desorption inner tank to reach adsorption balance at a set temperature and pressure, keeping the adsorption balance time at least 8 hours, and recording and calculating volume data and the set temperature and pressure;
(4) And (3) filling water into a measuring cylinder: connecting a high-pressure hose, a water injection pump and a second quick adapter, filling water into a measuring cylinder, unscrewing a spiral clamp, sucking the liquid level in the measuring cylinder to the liquid level of a scale (0 scale is positioned at the uppermost end of the measuring cylinder) through operating a suction ball, screwing the spiral clamp in the opposite direction, and sealing the high-pressure hose and the measuring cylinder;
(5) And (3) coal powder desorption: connecting a water injection pump, a water inlet pipe and a second quick adapter, injecting water into a desorption inner tank, observing through a water level monitor until pulverized coal is liquid sealed, re-adsorbing and balancing the liquid sealed coal sample for not less than 8 hours, rapidly discharging methane gas above the liquid level in the desorption inner tank to the pressure in the desorption inner tank through a desorption pipe to be normal pressure, recording the volume of water and the volume of discharged methane gas, starting a stirring device at the moment, and heating the oil bath through a heater until the temperature required by desorption is reached; connecting a high-pressure hose and a desorption pipe with a first quick adapter, discharging water from a measuring cylinder through a water outlet by using gas, and collecting the gas into the measuring cylinder by using a water and gas discharging method; recording the reading and detection time of the measuring cylinder at certain intervals, and continuously observing for 120 min; the specified reading interval time is as follows: within 60min before the observation is started, the interval from the first point to the third point is 1-2min, and the reading is carried out every 2-5min later; readings are taken every interval of 10-20min for 60-120 min.
In the simulated adsorption process, according to the state equation:
PV＝nZRT
wherein: p is the pressure in the desorber tank in Pa; v is the volume of methane injected in cm 3 The method comprises the steps of carrying out a first treatment on the surface of the n is the molar quantity of injected methane, and the unit is mol; z is a compression factor at different temperatures, dimensionless; r is an Avgalileo constant, T is the temperature in the desorption inner tank, and the unit is Kelvin, which is called K for short.
In the experimental process, the actual methane molar quantity is required to be calculated according to the volume of methane injected into a methane bottle, the temperature and the pressure in an inner desorption tank are calculated according to a temperature meter and a pressure meter for the experiment, the condition that a state equation is constant is established in the reaction process, the gas molar quantity adsorbed by a coal body is calculated under the condition that the temperature and the pressure required by the reaction are known, and then the equation is used:
V＝V m ×n
wherein: v is the volume of adsorbed gas in cm 3 The method comprises the steps of carrying out a first treatment on the surface of the Vm is the volume of 1mol of gas under standard conditions, which is 22.4L, and the unit is L/mol; n is the molar amount of adsorbed gas in mol.
It is noted that relational terms such as first and second, and the like, if any, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (4)
1. An experimental device for water immersion pulverized coal adsorption and desorption, which is characterized in that: comprises a desorption tank, a measuring cylinder, a helium bottle, a methane bottle, a water injection pump and a vacuum pump; the measuring cylinder is vertically arranged, a high-pressure hose is arranged on the measuring cylinder, a top cover is arranged at the top end of the measuring cylinder, an air suction pipe is connected to the top cover in a pluggable mode, a spiral clamp is arranged on the air suction pipe, and an air suction ball is arranged at one end, far away from the top cover, of the air suction pipe; the desorption tank is connected with a water inlet pipe, a desorption pipe and an exhaust pipe in a pluggable manner, and the desorption pipe is provided with a flowmeter; the exhaust pipe is connected with the vacuum pump in a pluggable manner; the desorption pipe is provided with a first quick adapter at one end far away from the desorption tank, and the desorption pipe can be connected with a methane bottle and a high-pressure hose in a convertible way through the first quick adapter; the end, far away from the desorption tank, of the water inlet pipe is provided with a second quick switching joint, and the water inlet pipe can be connected with a helium bottle, a water injection pump and a high-pressure hose in a switching way through the second quick switching joint; the high-pressure hose and the water injection pump can be connected through a second quick adapter;
the desorption tank comprises a desorption outer tank, a desorption inner tank, a disk with holes, a stirring device, a water level monitor and a desorption tank sealing cover; the desorption inner tank is arranged in the desorption outer tank, the desorption outer tank and the desorption inner tank are of cylindrical structures with the upper ends open and the lower ends closed, the desorption tank sealing cover is hinged to the upper end of the desorption outer tank, the perforated circular disc is arranged between the desorption inner tank and the desorption tank sealing cover, and the stirring device and the water level monitor are arranged in the desorption inner tank; an oil bath cavity is reserved between the desorption inner tank and the desorption outer tank, oil bath liquid is filled in the oil bath cavity, an electric heating device is arranged in the oil bath cavity, the electric heating device is an electric heating wire, a socket is arranged on the desorption outer tank, the socket is connected with the electric heating device, and a heat insulation layer is arranged on the inner wall of the desorption outer tank;
the desorption tank sealing cover is hinged with the desorption outer tank through a hinge; the desorption tank sealing cover is provided with an elastic switch, the elastic switch is positioned at the other side of the desorption tank sealing cover relative to the hinge, and the desorption tank sealing cover is connected with the desorption outer tank in an openable manner through the elastic switch; the upper surface of the desorption tank sealing cover is provided with a thermometer and a pressure gauge; the desorption tank sealing cover is provided with a water injection hole, a desorption hole and an air extraction hole which penetrate through the desorption tank sealing cover, and the water injection hole, the desorption hole and the air extraction hole are respectively connected with the water inlet pipe, the desorption pipe and the air extraction pipe correspondingly;
the porous disc is provided with three through holes penetrating through the porous disc, the three through holes are respectively communicated with a water injection hole, a desorption hole and an air extraction hole, and the air extraction holes and the corresponding through holes are internally provided with filter screens; the stirring device comprises a stirring rod, the stirring rod is vertically arranged, a stirring motor is arranged on the perforated disc, the top end of the stirring rod is connected with the stirring motor, and stirring blades are arranged at the bottom end of the stirring rod; the top end of the water level monitor is fixed on the perforated disc, and the lower end of the water level monitor stretches into the desorption inner tank;
the measuring cylinder is characterized in that a measuring cylinder seat is arranged at the bottom end of the measuring cylinder, a containing groove is formed in the measuring cylinder seat, the bottom end of the measuring cylinder is fixed in the containing groove, and a water outlet is formed in the position, close to the bottom end, of the measuring cylinder.
2. The water immersed pulverized coal adsorption and desorption experiment device according to claim 1, wherein: the experimental device also comprises a quick plug-in device, and the desorption pot is connected with the water inlet pipe, the desorption pipe and the exhaust pipe in a plug-in manner through the quick plug-in device; the quick plug device comprises a fixed end and a quick plug end, wherein the fixed end is fixed on the desorption pot, the fixed end is communicated with the corresponding water injection hole, the desorption hole and the air exhaust hole, and the quick plug end is fixed on the corresponding water inlet pipe, the corresponding desorption pipe or the corresponding air exhaust pipe; the fixed end include sealed pad, sealed pad in install female joint and jump ring, the jump ring be located female joint directly over portion, sealed upper end of filling up install O type sealed cushion, quick plug end include hollow bolt, hollow bolt in install the male joint, male joint and hollow bolt between install O type sealed cushion, the lower extreme of male joint be provided with jump ring complex draw-in groove.
3. The water logging pulverized coal adsorption and desorption experiment device according to claim 2, wherein: the air suction pipe, the top cover, the air suction pipe and the vacuum pump are connected in a pluggable manner through a quick plug-in device.
4. An experimental method of an experimental apparatus for water immersed pulverized coal adsorption and desorption as claimed in any one of claims 1 to 3, comprising the steps of:
(1) And (3) checking tightness: pressing an elastic switch at a sealing cover of the desorption tank, sealing the desorption tank, pressurizing the inside of the desorption tank to 2Mpa through a desorption port by utilizing an air pump, smearing soap liquid at each quick plug interface on the desorption tank, observing whether bubbles are generated, and ensuring that the pressure reduction of the pressure in 30 minutes accords with the tightness required by an experiment according to the pressure value before and after gas injection of a pressure gauge, so that the tightness of the experimental device before the experiment meets the experimental standard;
(2) Placing a sample, calibrating the volume: placing the screened pulverized coal into an desorption inner tank, closing an elastic switch, connecting a helium bottle and a water injection hole with a second quick adapter, and injecting helium into the desorption inner tank to calibrate the volume of the pulverized coal;
(3) Simulation adsorption: pumping helium to vacuum through a vacuum pump, connecting a methane bottle and a desorption pipe with a first quick adapter, injecting methane into a desorption inner tank, enabling a coal sample in the desorption inner tank to reach adsorption balance at a set temperature and pressure, keeping the adsorption balance time at least 8 hours, and recording and calculating volume data and the set temperature and pressure;
(4) And (3) filling water into a measuring cylinder: connecting a high-pressure hose, a water injection pump and a second quick adapter, filling water into a measuring cylinder, unscrewing a spiral clamp, sucking the liquid level in the measuring cylinder to the liquid level of a scale (0 scale is positioned at the uppermost end of the measuring cylinder) through operating a suction ball, screwing the spiral clamp in the opposite direction, and sealing the high-pressure hose and the measuring cylinder;
(5) And (3) coal powder desorption: connecting a water injection pump, a water inlet pipe and a second quick adapter, injecting water into a desorption inner tank, observing through a water level monitor until pulverized coal is liquid sealed, re-adsorbing and balancing the liquid sealed coal sample for not less than 8 hours, rapidly discharging methane gas above the liquid level in the desorption inner tank to the pressure in the desorption inner tank through a desorption pipe to be normal pressure, recording the volume of water and the volume of discharged methane gas, starting a stirring device at the moment, and heating the oil bath through a heater until the temperature required by desorption is reached; connecting a high-pressure hose and a desorption pipe with a first quick adapter, discharging water from a measuring cylinder through a water outlet by using gas, and collecting the gas into the measuring cylinder by using a water and gas discharging method; recording the reading and detection time of the measuring cylinder at certain intervals, and continuously observing for 120 min; the specified reading interval time is as follows: within 60min before the observation is started, the interval from the first point to the third point is 1-2min, and the reading is carried out every 2-5min later; readings are taken every interval of 10-20min for 60-120 min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811149419.8A CN109187267B (en) | 2018-09-29 | 2018-09-29 | Experimental device and experimental method for water immersion pulverized coal adsorption and desorption |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811149419.8A CN109187267B (en) | 2018-09-29 | 2018-09-29 | Experimental device and experimental method for water immersion pulverized coal adsorption and desorption |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109187267A CN109187267A (en) | 2019-01-11 |
| CN109187267B true CN109187267B (en) | 2024-02-13 |
Family
ID=64906991
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811149419.8A Active CN109187267B (en) | 2018-09-29 | 2018-09-29 | Experimental device and experimental method for water immersion pulverized coal adsorption and desorption |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109187267B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110456022A (en) * | 2019-08-13 | 2019-11-15 | 安徽理工大学 | A kind of dynamic monitoring coal seam reservoirs sensibility and mining control simulation experiment system |
| CN111911129B (en) * | 2020-07-03 | 2022-06-28 | 安徽理工大学 | Experimental method for continuous separation of mixture of coal containing gas and water |
| CN113640174A (en) * | 2021-06-30 | 2021-11-12 | 中煤科工集团沈阳研究院有限公司 | Coal gas adsorption desorption heating oxidation coupling experiment platform and experiment method thereof |
| CN114878402A (en) * | 2022-06-15 | 2022-08-09 | 华北科技学院 | Coal petrography gas adsorbs desorption analogue test device |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102053141A (en) * | 2010-12-09 | 2011-05-11 | 中国矿业大学 | Device and method for testing influence of externally added water on desorption characteristic of gas-containing coal body |
| CN203786110U (en) * | 2014-03-18 | 2014-08-20 | 中国神华能源股份有限公司 | Measurement device of coal seam methane content |
| CN204666464U (en) * | 2015-05-26 | 2015-09-23 | 河南理工大学 | The experimental provision of coal-seam gas level pressure desorb |
| CN105910974A (en) * | 2016-06-12 | 2016-08-31 | 河南理工大学 | Experiment method and device for testing gas-containing coal seam isobaric imbibition effect |
| CN106092819A (en) * | 2015-06-04 | 2016-11-09 | 中国石油大学(北京) | A kind of air water is with the coal bed gas adsorption and desorption experiment method noted and equipment thereof |
| CN106908347A (en) * | 2017-03-29 | 2017-06-30 | 西安科技大学 | The experimental provision and application method of moisture are quantitatively adding in a kind of coal body to the adsorbed state for having certain pressure |
| CN207351844U (en) * | 2017-11-15 | 2018-05-11 | 重庆大学 | The controllable gas adsorption desorption experimental apparatus of coal sample moisture |
| CN108442972A (en) * | 2018-03-13 | 2018-08-24 | 西南石油大学 | Intelligent constant-temperature, ultrasonic wave promote to desorb integrated coal sample tank and its application method |
| CN209148476U (en) * | 2018-09-29 | 2019-07-23 | 安徽理工大学 | A kind of water logging coal dust adsorption and desorption experimental provision |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101608545B (en) * | 2009-07-20 | 2010-12-08 | 中国矿业大学(北京) | Method and device for testing gas migration process in coal rock mass |
-
2018
- 2018-09-29 CN CN201811149419.8A patent/CN109187267B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102053141A (en) * | 2010-12-09 | 2011-05-11 | 中国矿业大学 | Device and method for testing influence of externally added water on desorption characteristic of gas-containing coal body |
| CN203786110U (en) * | 2014-03-18 | 2014-08-20 | 中国神华能源股份有限公司 | Measurement device of coal seam methane content |
| CN204666464U (en) * | 2015-05-26 | 2015-09-23 | 河南理工大学 | The experimental provision of coal-seam gas level pressure desorb |
| CN106092819A (en) * | 2015-06-04 | 2016-11-09 | 中国石油大学(北京) | A kind of air water is with the coal bed gas adsorption and desorption experiment method noted and equipment thereof |
| CN105910974A (en) * | 2016-06-12 | 2016-08-31 | 河南理工大学 | Experiment method and device for testing gas-containing coal seam isobaric imbibition effect |
| CN106908347A (en) * | 2017-03-29 | 2017-06-30 | 西安科技大学 | The experimental provision and application method of moisture are quantitatively adding in a kind of coal body to the adsorbed state for having certain pressure |
| CN207351844U (en) * | 2017-11-15 | 2018-05-11 | 重庆大学 | The controllable gas adsorption desorption experimental apparatus of coal sample moisture |
| CN108442972A (en) * | 2018-03-13 | 2018-08-24 | 西南石油大学 | Intelligent constant-temperature, ultrasonic wave promote to desorb integrated coal sample tank and its application method |
| CN209148476U (en) * | 2018-09-29 | 2019-07-23 | 安徽理工大学 | A kind of water logging coal dust adsorption and desorption experimental provision |
Non-Patent Citations (1)
| Title |
|---|
| 中华人民共和国煤炭部.MT/T 77-94煤层气测定方法（解吸法）.中国标准出版社,1994,第1-4页. * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109187267A (en) | 2019-01-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109187267B (en) | Experimental device and experimental method for water immersion pulverized coal adsorption and desorption | |
| CN109372499B (en) | Geological reservoir radial flow simulation system | |
| CN103776979B (en) | A kind of coal seam water infusion suppresses analog detection method and the device of desorption of mash gas effect | |
| CN109236243B (en) | Three-dimensional comprehensive reservoir hydrate simulation analysis system and analysis method | |
| CN106896044B (en) | The multifunction experiment apparatus and method of supercritical carbon dioxide displacement coal bed methane | |
| CN205135580U (en) | Long rock core carbon dioxide gas drives experimental system | |
| CN104777269A (en) | Supercritical CO2 injection and coalbed methane enhanced displacement simulation test method | |
| CN109342264B (en) | Device and method for desorbing and measuring content of coal bed gas and shale gas | |
| CN104729948A (en) | Water-gas two-phase percolation experimental system and method of gas-containing coal | |
| CN103558137A (en) | Device for measuring gas-water two-phase relative permeability of porous medium | |
| CN106706500A (en) | Device for determining permeability of concrete | |
| CN107727530A (en) | Based on the whole airtight instrument for measuring gas content of integration of temperature and pressure backtracking principle and application | |
| CN113324889A (en) | Device for evaluating shale oil in-situ pyrolysis exploitation displacement efficiency and testing method | |
| CN105717027A (en) | Test device for rock permeability by simulating underground deep rock environment | |
| CN205559782U (en) | API standard water conservancy diversion room and rock plate sealing module thereof | |
| CN209148476U (en) | A kind of water logging coal dust adsorption and desorption experimental provision | |
| CN109211757B (en) | Rock penetration test device and test method thereof | |
| CN110529107A (en) | Coal seam strain, seepage flow, displacement and jet stream integrated experiment device and method | |
| CN112945827A (en) | Rock dynamic physical property measuring system | |
| CN109785724B (en) | Hot-pressing simulation system and method based on bag type reaction kettle | |
| CN113944462B (en) | Weak bond hydrate layer curing transformation simulation experiment system and method | |
| CN113936537A (en) | Hydrocarbon generation dynamics simulation experiment device and method | |
| CN208076619U (en) | Nitrogen is gas displacing coal-bed to use complex resistance measuring system | |
| CN108196002A (en) | A kind of fracture acidizing is with temporary stall to liquid device for evaluating performance and its test method | |
| CN105717255A (en) | Complex solvent soaking huff and puff circulation experimental device and simulation mining method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |