CN105842275A - Steam driven coal gas desorption heat conduction test method - Google Patents
Steam driven coal gas desorption heat conduction test method Download PDFInfo
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- 238000003795 desorption Methods 0.000 title claims abstract description 30
- 239000003034 coal gas Substances 0.000 title claims abstract description 17
- 238000010998 test method Methods 0.000 title claims abstract description 10
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 94
- 239000003245 coal Substances 0.000 claims abstract description 83
- 238000012360 testing method Methods 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 14
- 238000002347 injection Methods 0.000 claims abstract description 11
- 239000007924 injection Substances 0.000 claims abstract description 11
- 210000003437 trachea Anatomy 0.000 claims description 102
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 33
- 239000007788 liquid Substances 0.000 claims description 22
- 238000010795 Steam Flooding Methods 0.000 claims description 16
- 238000002474 experimental method Methods 0.000 claims description 11
- 230000035699 permeability Effects 0.000 claims description 11
- 230000008676 import Effects 0.000 claims description 9
- 238000010521 absorption reaction Methods 0.000 claims description 6
- 230000006835 compression Effects 0.000 claims description 6
- 238000007906 compression Methods 0.000 claims description 6
- 230000007246 mechanism Effects 0.000 claims description 6
- 230000037452 priming Effects 0.000 claims description 6
- 238000013461 design Methods 0.000 claims description 4
- 230000008602 contraction Effects 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 238000004088 simulation Methods 0.000 claims description 3
- 238000012546 transfer Methods 0.000 abstract description 4
- 238000001179 sorption measurement Methods 0.000 abstract description 2
- 238000005259 measurement Methods 0.000 abstract 2
- 238000000605 extraction Methods 0.000 description 5
- 238000005553 drilling Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010793 Steam injection (oil industry) Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000003204 osmotic effect Effects 0.000 description 1
- 238000005325 percolation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000004781 supercooling Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
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- 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
- G01N15/082—Investigating permeability by forcing a fluid through a sample
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Abstract
A steam driven coal gas desorption heat conduction test method. The test method uses a test device for steam driven coal gas desorption heat conduction. The device comprises a vacuumizing system, a gas injection system, a desorption heat transfer system and a gas metering system. A coal sample is arranged in a holder for the adsorption of methane; and a gas injection system injects high-pressure steam for seepage and heat transfer into the coal sample. Through the test of coal sample outlet flow, gas concentration and temperature changes at both ends of the coal sample, the gas desorption and heat transfer of coal sample data can be obtained. The invention has the advantages of convenient operation, small workload, fast and accurate measurement and high experimental performance, and provides a novel method for the measurement of the desorption rate and the thermal conductivity of the coal bed gas.
Description
Technical field
The invention belongs to coal mine gas drainage technical field, be specifically related to the method for testing of a kind of steam drive coal gas heat of desorption conduction.
Background technology
Coal mine gas is a kind of imflammable gas, it is the resource of a kind of preciousness, also it is the maximum hidden danger threatening Safety of Coal Mine Production, in mining process, gas is gushed out to the tunnel of mine from coal seam internal diffusion, when the gas density in tunnel reaches explosion limit, when running into naked light, will result in Gas Explosion Accidents in Coal Mines.Carry out the gas pre-drainage of this coal seam, down-hole or adjacent coal seam adopting is to reduce mine gas emission rate, the effective ways of preventing and treating coal mine gas disaster.Currently known coal bed gas extraction method mainly has the extraction of this coal bed drilling, adjacent coal seam layer-through drilling extraction, the adjacent coal seam tunnel boring method such as associating extraction and surface vertical borehole extraction, the common principle of these methods is construct in the coal seam boring with ft connection or tunnel, boring or the high gas of tunnel ambient pressure can low-pressure area flowings to boring or tunnel, but owing to most coalfields of China broadly fall into low permeability coal seam, the speed of Gas Flow is slow, and conventional gas drainage method is poor for low permeability coal seam effect.
nullChina has abundant coal bed gas resource，Wherein most coal seams are low permeability coal seam，Coal-bed gas exploitation amount is little，Cost of winning is high、Time is long，Therefore，Many scholars have carried out substantial amounts of experimental and theoretical study to the permeability and infiltration capacity that how to improve coal bed gas for many years，Focus primarily upon crustal stress to coal and rock Permeability and the method for Enhanced Coalbed Methane Recovery by Injecting Gas，Theory also discloses，Temperature is to improve a key factor of coal bed gas breathability，Steam injects and improves coal seam temperature in coal seam，Promote coal bed gas desorbing，Steam is the flowing of osmotic drive coal bed gas in coal seam，Coal-bed gas exploitation efficiency can be improved，But for coal bed gas condition、Coal bed methane condition，Need to use different steam injection parameter such as vapor (steam) temperatures、Steam quality、Steam flow、Gas injection boring layout etc.，For case above，Need badly and steam drive coal gas Desorption And Seepage is tested.
Summary of the invention
The present invention is to solve weak point of the prior art, there is provided a kind of convenient to operate, workload is little, measure quick and precisely, experimental performance is high, it is possible to measure under the conditions of varying environment the method for testing of a kind of steam drive coal gas heat of desorption conduction of the adsorption and permeation of gas in coal body rapidly and accurately.
For solving above-mentioned technical problem, the present invention adopts the following technical scheme that the method for testing that a kind of steam drive coal gas heat of desorption conducts, this method of testing uses the test device of steam drive coal gas heat of desorption conduction to carry out, and the test device of steam drive coal gas heat of desorption conduction includes pumped vacuum systems, gas injection system, heat of desorption conducting system and gas metering system；
Pumped vacuum systems includes vacuum pump and Dewar vessel, and the air inlet of vacuum pump is connected with the gas outlet of Dewar vessel by the first trachea, and the first trachea is sequentially provided with vacuum meter and the first stop valve along gas flow direction；
Gas injection system includes methane gas tank, methane gas tank is connected with heat of desorption conducting system by the second trachea, and the second trachea is sequentially provided with high pressure gauge, the first air relief valve, low-pressure meter, the first blower pump for pipeline, the second stop valve, check valve, steam generation mechanism, pressure regulator valve, the 3rd stop valve and the first Pressure gauge along gas flow direction；The air inlet of Dewar vessel is connected by the 3rd trachea and the second trachea, and the junction of the 3rd trachea and the second trachea is between pressure regulator valve and the 3rd stop valve, and the 3rd trachea is provided with the 4th stop valve；
Steam generation mechanism includes water tank and steam generator, and water tank is connected with steam generator by the first water pipe, and steam generator is connected by the 4th trachea and the second trachea；It is sequentially provided with self priming pump, the 5th stop valve, high pressure water tank and the 6th stop valve along water flow direction on first water pipe, it is sequentially provided with the second Pressure gauge, the 7th stop valve, second pipe booster pump and the 8th stop valve along steam flow direction on 4th trachea, at the gas outlet of steam generator, is provided with thermometer；
Heat of desorption conducting system includes seal box, three axle clamp holder and compensators；Compensator and three axle clamp holder are positioned at seal box, and methane gas tank is connected by the second trachea and three axle clamp holder；Compensator is provided with the 4th Pressure gauge, the air inlet of compensator is connected by the 5th trachea and the second trachea, the junction of the 5th trachea and the second trachea is between pressure regulator valve and the 3rd stop valve, the gas outlet of compensator is connected by the 6th trachea and the second trachea, the junction of the 6th trachea and the second trachea is between the first Pressure gauge and three axle clamp holder, 5th trachea is provided with the 9th stop valve, and the 6th trachea is provided with the tenth stop valve；The import of seal box is provided with the first temperature sensor, and the outlet of seal box is provided with the second temperature sensor；Three axle clamp holder are connected by the 7th trachea axial compression pump, and three axle clamp holder are connected by the 8th trachea confined pressure pump, and the 7th trachea is provided with the 11st stop valve, and the 8th trachea is provided with the 12nd stop valve；
Gas metering system includes data acquisition control computer, electronic balance, gas-liquid separator and gas flowmeter, gas-liquid separator is connected by the outlet of the 9th trachea and three axle clamp holder, and the 9th trachea is sequentially provided with the 3rd Pressure gauge, the second air relief valve, the 13rd stop valve and refrigerator along gas flow direction；Gas-liquid separator is connected with gas flowmeter by the tenth trachea, and the tenth trachea is provided with exsiccator；Data acquisition control computer is connected by data wire and the first Pressure gauge, the first temperature sensor, the second temperature sensor, the 4th Pressure gauge, the 3rd Pressure gauge, gas flowmeter and electronic balance respectively；
The method of testing of steam drive coal gas heat of desorption conduction, comprises the following steps:
(1) coal sample is prepared: gathering the coal seam of different permeability, be processed into the coal sample of Ф 50 × 200mm specification as requested, 50mm is coal sample diameter, and 200mm is coal sample length；
(2) checking experiment condition: check each experimental facilities, test whether it stands intact, and check that all pipelines are the most unimpeded, whether the gas content of methane gas tank can reach the experimental pressure of design anticipation, the sealing effectiveness of three axle clamp holder is the most intact, the registration of each experiment instrument is the most normal, the circuit of electrical equipment whether path；
(3) assemble coal sample and prepare vacuum experiment condition: coal sample being put thermal contraction rubber sleeve, is subsequently secured in three axle clamp holder；Opening the 3rd stop valve, the 4th stop valve and the first stop valve, other valves are closed, and open vacuum pump, when the registration of vacuum meter is 0.1Mpa, close the 3rd stop valve, the 4th stop valve and the first stop valve；
(4) filling methane gas in compensator: open the first air relief valve, the second stop valve, check valve, pressure regulator valve and the 9th stop valve, open methane gas tank simultaneously, methane gas enters compensator under the driving of the first blower pump for pipeline and along the second trachea, when the force value on the 4th Pressure gauge on compensator reaches setting value, close methane gas tank, simultaneously close off the first air relief valve, the second stop valve, check valve, pressure regulator valve and the 9th stop valve；
(5) filling methane gas in three axle clamp holder: open the tenth stop valve, methane gas in compensator is along the 6th trachea and in the second trachea enters three axle clamp holder, 24h is filled with methane gas continuously, make coal sample that the absorption of methane gas to reach balance, when the 4th manometric registration no longer changes, close the tenth stop valve；
(6) coal sample force simulation: open the 11st stop valve and the 12nd stop valve, then start axial compression pump and confined pressure pump, coal sample is applied axial compressive force and circumferential pressure；
(7) data acquisition control computer is opened；
(8) in three axle clamp holder, high temperature and high pressure steam it is passed through: open the 5th stop valve, it is then turned on self priming pump toward water filling in high pressure water tank, after filling water in high pressure water tank, close the 5th stop valve and high pressure water tank, then open the 6th stop valve and start steam generator, after thermometer registration at the gas outlet of steam generator reaches setting value, open the 7th stop valve successively, 8th stop valve and the 3rd stop valve, open second pipe booster pump simultaneously, under the driving of second pipe booster pump, high temperature and high pressure steam is injected in three axle clamp holder, regulation pressure regulator valve regulates the first manometric registration, the first manometric registration is made to reach setting value；
(9) refrigerator is opened, then the second air relief valve is opened, 13rd stop valve, gas liquid mixture in three axle clamp holder sequentially passes through the 3rd Pressure gauge, second air relief valve, 13rd stop valve and refrigerator enter in gas-liquid separator, cooled liquid flows out to electronic balance from the outlet of gas-liquid separator, the methane gas being desorbed is discharged through exsiccator and gas flowmeter, registration b of the second temperature sensor of the first temperature sensor registration a of data acquisition control computer record seal box import department and seal box import department simultaneously, pyroconductivity formula according to coal sample, calculate coal sample pyroconductivity k=(b-a)/L, L is length 200mm of coal sample.
Use technique scheme, the method have the advantages that primary operational of the present invention is the linking between pumped vacuum systems, gas injection system, heat of desorption conducting system, gas metering system and cooperation, in the case of room temperature, pumped vacuum systems is that the air in pipeline and each equipment is discharged；Heat of desorption conducting system mainly places compensator and three axle clamp holder, and in keeping seal box, device keeps a certain steady temperature, after punching methane gas, coal sample is applied axial compressive force and circumferential pressure；The methane gas injecting certain pressure that gas injection system is artificial is stored in compensator, it is then passed through compensator in three axle clamp holder, injects the methane gas of specified pressure, after allowing coal sample fully absorb, start to inject high temperature and high pressure steam, utilize the methane gas generation desorbing of absorption in steam drive coal body and flow to the side that pressure is little；Metering system be from heat of desorption conducting system effluent air after supercooling, vapour liquid separator separates, the methane of gas outlet is through dried, it is expelled directly out through effusion meter, data line transfer additionally can be utilized to data acquisition control computer, record steam inlet and the pressure gauge reading of outlet, temperature sensor registration, the Pressure gauge registration of compensator, the registration of high Accuracy Electronic Balance, the registration of gas flowmeter, and then calculating the permeability of the permeability of desorbing gas, steam in coal body, steam is heat conductivity in coal body；High-temperature steam drives gas porous flow technology in coal body to be the methane desorbing utilizing high temperature and high pressure steam to promote in coal, a kind of new experiment method of test coal-bed gas breathability；The percolation law of coal body, the thermal conductivity law of coal body under the influence of Study on Test Method stress and temperature, it is possible to provide method for the design of gas pumping and the exploitation of optimization and coal bed gas.
In sum, the present invention is convenient to operate, workload is little, measure quick and precisely, experimental performance is high, and permeability and pyroconductivity for coal bed gas provide experimental technique and theoretical research.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention.
Detailed description of the invention
As it is shown in figure 1, the test device of a kind of steam drive coal gas absorption seepage flow of the present invention, including pumped vacuum systems I, gas injection system II, heat of desorption conducting system III and gas metering system IV；
Pumped vacuum systems I includes vacuum pump 1 and Dewar vessel 2, and the air inlet of vacuum pump 1 is connected with the gas outlet of Dewar vessel 2 by the first trachea 13, and the first trachea 13 is sequentially provided with vacuum meter 3 and the first stop valve 14 along gas flow direction；
Gas injection system II includes methane gas tank 4, methane gas tank 4 is connected with heat of desorption conducting system by the second trachea 15, and the second trachea 15 is sequentially provided with high pressure gauge the 5, first air relief valve 6, low-pressure meter the 7, first blower pump for pipeline the 8, second stop valve 58, check valve 9, steam generation mechanism, pressure regulator valve the 10, the 3rd stop valve 11 and the first Pressure gauge 12 along gas flow direction；The air inlet of Dewar vessel 2 is connected with the second trachea 15 by the 3rd trachea 16, and the junction of the 3rd trachea 16 and the second trachea 15 is between pressure regulator valve 10 and the 3rd stop valve 11, and the 3rd trachea 16 is provided with the 4th stop valve 17；
Steam generation mechanism includes that water tank 18 and steam generator 19, water tank 18 are connected with steam generator 19 by the first water pipe 20, and steam generator 19 is connected with the second trachea 15 by the 4th trachea 21；It is sequentially provided with self priming pump the 22, the 5th stop valve 23, high pressure water tank 24 and the 6th stop valve 25 along water flow direction on first water pipe 20, it is sequentially provided with the second Pressure gauge the 26, the 7th stop valve 27, second pipe booster pump 28 and the 8th stop valve 29 along steam flow direction on 4th trachea 21, at the gas outlet of steam generator 19, is provided with thermometer 30；
Heat of desorption conducting system III includes seal box 31, three axle clamp holder 32 and compensator 33；Compensator 33 and three axle clamp holder 32 are positioned at seal box 31, and methane gas tank 4 is connected with three axle clamp holder 32 by the second trachea 15；Compensator 33 is provided with the 4th Pressure gauge 34, the air inlet of compensator 33 is connected with the second trachea 15 by the 5th trachea 35, the junction of the 5th trachea 35 and the second trachea 15 is between pressure regulator valve 10 and the 3rd stop valve 11, the gas outlet of compensator 33 is connected with the second trachea 15 by the 6th trachea 36, the junction of the 6th trachea 36 and the second trachea 15 is between the first Pressure gauge 12 and three axle clamp holder 32,5th trachea 35 is provided with the 9th stop valve 37, and the 6th trachea 36 is provided with the tenth stop valve 38；The import of seal box 31 is provided with the first temperature sensor 39, and the outlet of seal box 31 is provided with the second temperature sensor 40；Three axle clamp holder 32 are connected by the 7th trachea 41 axial compression pump 42, and three axle clamp holder 32 are connected by the 8th trachea 43 confined pressure pump 44, and the 7th trachea 41 is provided with the 11st stop valve 45, and the 8th trachea 43 is provided with the 12nd stop valve 46；
Gas metering system IV includes data acquisition control computer 47, electronic balance 48, gas-liquid separator 49 and gas flowmeter 50, gas-liquid separator 49 is connected with the outlet of three axle clamp holder 32 by the 9th trachea 51, and the 9th trachea 51 is sequentially provided with the 3rd Pressure gauge the 52, second air relief valve the 53, the 13rd stop valve 54 and refrigerator 55 along gas flow direction；Gas-liquid separator 49 the tenth trachea 56 is connected with gas flowmeter 50, and the tenth trachea 56 is provided with exsiccator 57；Data acquisition control computer 47 is connected by data wire and first Pressure gauge the 12, first temperature sensor the 39, second temperature sensor the 40, the 4th Pressure gauge the 34, the 3rd Pressure gauge 52, gas flowmeter 50 and electronic balance 48 respectively.
The method of testing of a kind of steam drive coal gas absorption seepage flow, comprises the following steps:
(1) coal sample is prepared: gather the coal seam of different permeability, be processed into Ф 50 × 200mm specification coal sample as requested；
(2) checking experiment condition: check each experimental facilities, test whether it stands intact, and check that all pipelines are the most unimpeded, whether the gas content of methane gas tank 4 can reach the experimental pressure of design anticipation, the sealing effectiveness of three axle clamp holder 32 is the most intact, the registration of each experiment instrument is the most normal, the circuit of electrical equipment whether path；
(3) assemble coal sample and prepare vacuum experiment condition: coal sample being put thermal contraction rubber sleeve, is subsequently secured in three axle clamp holder 32；Opening the 3rd stop valve the 11, the 4th stop valve 17 and the first stop valve 14, other valves are closed, and open vacuum pump 1, when the registration of vacuum pump 1 is 0.1Mpa, close the 3rd stop valve the 11, the 4th stop valve 17 and the first stop valve 14；
(4) filling methane gas in compensator 33: open first air relief valve the 6, second stop valve 58, check valve 9, pressure regulator valve 10 and the 9th stop valve 37, open methane gas tank 4 simultaneously, methane gas enters compensator 33 under the driving of the first blower pump for pipeline 8 and along the second trachea 15, when the force value on the 4th Pressure gauge 34 on compensator 33 reaches setting value, close methane gas tank 4, simultaneously close off first air relief valve the 6, second stop valve 58, check valve 9, pressure regulator valve 10 and the 9th stop valve 37；
(5) filling methane gas in three axle clamp holder 32: open the tenth stop valve 38, methane gas in compensator 33 enters three axle clamp holder 32 along the 6th trachea 36 and through the second trachea 15,24h is filled with methane gas continuously, the now absorption of coal sample has reached balance, when the registration of the 4th Pressure gauge 34 no longer changes, close the tenth stop valve 38；
(6) coal sample force simulation: open the 11st stop valve the 45 and the 12nd stop valve 46, then start axial compression pump 42 and confined pressure pump 44, coal sample is applied axial compressive force and circumferential pressure；
(7) data acquisition control computer 47 is opened；
(8) in three axle clamp holder 32, high temperature and high pressure steam it is passed through: open the 5th stop valve 23, it is then turned on self priming pump 22 toward water filling in high pressure water tank 24, after filling water in high pressure water tank 24, close the 5th stop valve 23 and high pressure water tank 24, then open the 6th stop valve 25 and start steam generator 19, after thermometer registration at the gas outlet of steam generator 19 reaches setting value, open the 7th stop valve 27 successively, 8th stop valve 29 and the 3rd stop valve 11, open second pipe booster pump 28 simultaneously, high temperature and high pressure steam is injected in three axle clamp holder 32, regulation pressure regulator valve 10 regulates the registration of the first Pressure gauge 12, the first manometric registration is made to reach setting value；
(9) refrigerator 55 is opened, then the second air relief valve 53 is opened, 13rd stop valve 54, gas liquid mixture in three axle clamp holder 32 sequentially passes through the 3rd Pressure gauge 52, second air relief valve 53, 13rd stop valve 54 and refrigerator 55 enter in gas-liquid separator 49, cooled liquid flows out to electronic balance 48 from the outlet of gas-liquid separator 49, the methane gas being desorbed is discharged through exsiccator 57 and gas flowmeter 50, data acquisition control computer 47 records registration a of the first temperature sensor 39 of seal box 31 import department and registration b of the second temperature sensor 40 of seal box 31 import department simultaneously, pyroconductivity formula according to coal sample, calculate coal sample pyroconductivity k=(b-a)/L, L is length 200mm of coal sample.
The shape of the present invention, material, structure etc. are not made any pro forma restriction by the present embodiment; every any simple modification, equivalent variations and modification made above example according to the technical spirit of the present invention, belongs to the protection domain of technical solution of the present invention.
Claims (1)
1. the method for testing of a steam drive coal gas heat of desorption conduction, it is characterized in that: this method of testing uses the test device of steam drive coal gas heat of desorption conduction to carry out, and the test device of steam drive coal gas heat of desorption conduction includes pumped vacuum systems, gas injection system, heat of desorption conducting system and gas metering system；
Pumped vacuum systems includes vacuum pump and Dewar vessel, and the air inlet of vacuum pump is connected with the gas outlet of Dewar vessel by the first trachea, and the first trachea is sequentially provided with vacuum meter and the first stop valve along gas flow direction；
Gas injection system includes methane gas tank, methane gas tank is connected with heat of desorption conducting system by the second trachea, and the second trachea is sequentially provided with high pressure gauge, the first air relief valve, low-pressure meter, the first blower pump for pipeline, the second stop valve, check valve, steam generation mechanism, pressure regulator valve, the 3rd stop valve and the first Pressure gauge along gas flow direction；The air inlet of Dewar vessel is connected by the 3rd trachea and the second trachea, and the junction of the 3rd trachea and the second trachea is between pressure regulator valve and the 3rd stop valve, and the 3rd trachea is provided with the 4th stop valve；
Steam generation mechanism includes water tank and steam generator, and water tank is connected with steam generator by the first water pipe, and steam generator is connected by the 4th trachea and the second trachea；It is sequentially provided with self priming pump, the 5th stop valve, high pressure water tank and the 6th stop valve along water flow direction on first water pipe, it is sequentially provided with the second Pressure gauge, the 7th stop valve, second pipe booster pump and the 8th stop valve along steam flow direction on 4th trachea, at the gas outlet of steam generator, is provided with thermometer；
Heat of desorption conducting system includes seal box, three axle clamp holder and compensators；Compensator and three axle clamp holder are positioned at seal box, and methane gas tank is connected by the second trachea and three axle clamp holder；Compensator is provided with the 4th Pressure gauge, the air inlet of compensator is connected by the 5th trachea and the second trachea, the junction of the 5th trachea and the second trachea is between pressure regulator valve and the 3rd stop valve, the gas outlet of compensator is connected by the 6th trachea and the second trachea, the junction of the 6th trachea and the second trachea is between the first Pressure gauge and three axle clamp holder, 5th trachea is provided with the 9th stop valve, and the 6th trachea is provided with the tenth stop valve；The import of seal box is provided with the first temperature sensor, and the outlet of seal box is provided with the second temperature sensor；Three axle clamp holder are connected by the 7th trachea axial compression pump, and three axle clamp holder are connected by the 8th trachea confined pressure pump, and the 7th trachea is provided with the 11st stop valve, and the 8th trachea is provided with the 12nd stop valve；
Gas metering system includes data acquisition control computer, electronic balance, gas-liquid separator and gas flowmeter, gas-liquid separator is connected by the outlet of the 9th trachea and three axle clamp holder, and the 9th trachea is sequentially provided with the 3rd Pressure gauge, the second air relief valve, the 13rd stop valve and refrigerator along gas flow direction；Gas-liquid separator is connected with gas flowmeter by the tenth trachea, and the tenth trachea is provided with exsiccator；Data acquisition control computer is connected by data wire and the first Pressure gauge, the first temperature sensor, the second temperature sensor, the 4th Pressure gauge, the 3rd Pressure gauge, gas flowmeter and electronic balance respectively；
The method of testing of steam drive coal gas heat of desorption conduction, comprises the following steps:
(1) coal sample is prepared: gathering the coal seam of different permeability, be processed into the coal sample of Ф 50 × 200mm specification as requested, 50mm is coal sample diameter, and 200mm is coal sample length；
(2) checking experiment condition: check each experimental facilities, test whether it stands intact, and check that all pipelines are the most unimpeded, whether the gas content of methane gas tank can reach the experimental pressure of design anticipation, the sealing effectiveness of three axle clamp holder is the most intact, the registration of each experiment instrument is the most normal, the circuit of electrical equipment whether path；
(3) assemble coal sample and prepare vacuum experiment condition: coal sample being put thermal contraction rubber sleeve, is subsequently secured in three axle clamp holder；Opening the 3rd stop valve, the 4th stop valve and the first stop valve, other valves are closed, and open vacuum pump, when the registration of vacuum meter is 0.1Mpa, close the 3rd stop valve, the 4th stop valve and the first stop valve；
(4) filling methane gas in compensator: open the first air relief valve, the second stop valve, check valve, pressure regulator valve and the 9th stop valve, open methane gas tank simultaneously, methane gas enters compensator under the driving of the first blower pump for pipeline and along the second trachea, when the force value on the 4th Pressure gauge on compensator reaches setting value, close methane gas tank, simultaneously close off the first air relief valve, the second stop valve, check valve, pressure regulator valve and the 9th stop valve；
(5) filling methane gas in three axle clamp holder: open the tenth stop valve, methane gas in compensator is along the 6th trachea and in the second trachea enters three axle clamp holder, 24h is filled with methane gas continuously, make coal sample that the absorption of methane gas to reach balance, when the 4th manometric registration no longer changes, close the tenth stop valve；
(6) coal sample force simulation: open the 11st stop valve and the 12nd stop valve, then start axial compression pump and confined pressure pump, coal sample is applied axial compressive force and circumferential pressure；
(7) data acquisition control computer is opened；
(8) in three axle clamp holder, high temperature and high pressure steam it is passed through: open the 5th stop valve, it is then turned on self priming pump toward water filling in high pressure water tank, after filling water in high pressure water tank, close the 5th stop valve and high pressure water tank, then open the 6th stop valve and start steam generator, after thermometer registration at the gas outlet of steam generator reaches setting value, open the 7th stop valve successively, 8th stop valve and the 3rd stop valve, open second pipe booster pump simultaneously, under the driving of second pipe booster pump, high temperature and high pressure steam is injected in three axle clamp holder, regulation pressure regulator valve regulates the first manometric registration, the first manometric registration is made to reach setting value；
(9) refrigerator is opened, then the second air relief valve is opened, 13rd stop valve, gas liquid mixture in three axle clamp holder sequentially passes through the 3rd Pressure gauge, second air relief valve, 13rd stop valve and refrigerator enter in gas-liquid separator, cooled liquid flows out to electronic balance from the outlet of gas-liquid separator, the methane gas being desorbed is discharged through exsiccator and gas flowmeter, registration b of the second temperature sensor of the first temperature sensor registration a of data acquisition control computer record seal box import department and seal box import department simultaneously, pyroconductivity formula according to coal sample, calculate coal sample pyroconductivity k=(b-a)/L, L is the length of coal sample.
Priority Applications (1)
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| CN116148154A (en) * | 2023-01-06 | 2023-05-23 | 中国科学院地质与地球物理研究所 | Experimental device and interpretation method for simulating core seepage heat and mass transfer under high temperature and high pressure |
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| CN109632557B (en) * | 2019-01-22 | 2021-11-16 | 中国矿业大学 | Gas-liquid two-phase saturated coal rock sample experimental device and saturation testing method |
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