CN107796730A - A kind of extra electric field strengthens coal sample desorption of mash gas test method - Google Patents
A kind of extra electric field strengthens coal sample desorption of mash gas test method Download PDFInfo
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- CN107796730A CN107796730A CN201711042015.4A CN201711042015A CN107796730A CN 107796730 A CN107796730 A CN 107796730A CN 201711042015 A CN201711042015 A CN 201711042015A CN 107796730 A CN107796730 A CN 107796730A
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- coal sample
- electric field
- desorption
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- 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
Abstract
The invention belongs to the category that non-mechanics method improves gas pumping rate and coal electricity modification technology, disclose a kind of extra electric field and strengthen coal sample desorption of mash gas test method, during coal sample gas diffusion initial speed determination test and the experiment of coal sample desorption of mash gas is carried out, extra electric field is applied to coal sample.The present invention is by changing coal body physical property, and coal body porous dehiscence gap, reduction absorption potential, reinforcing coal gas permeates and flowing, improves gas pumping rate, test result indicates that：Desorption of mash gas amount is set to reach maximum in the presence of a feature field strength 1200v/cm, it is possible to increase gas desorption quantity at initial stage 20%~40%.
Description
Technical field
The present invention relates to gas pumping technical field, strengthens the experiment of coal sample desorption of mash gas more particularly to a kind of extra electric field
Method.
Background technology
Gas diffusion initial speed is one of the index for predicting Gas Outburst, and Gas Outburst is to complete moment, and coal diffuses watt
This capacity of water has direct relation with prominent, and research 0~1min Methane Diffusions speed is to studying coal and gas prominent
It is significant.
Coal-bed gas average extraction rate in China's is relatively low, and Desorption And Seepage is poor, and not yet finds and can significantly improve coal seam watt
This pumping method, improving the method for coal-bed gas Desorption And Seepage at present has three classes, and the first kind belongs to waterpower and blast cracking, brill
The mechanics method such as hole and slot release, Mining Protective Seam, the methods of the second class is by gas injection displacement and displacement in flooding, the 3rd class
The methods of being by additional temperature field, microwave field and sound field, from the point of view of the practical application effect of these methods, due to each mine
Condition of coal seam occurrence have differences, some methods fail to be widely applied in many mining areas, it would be highly desirable to seek other new skills
Art method and theory.
Extra electric field causes gas diffusion initial speed curve is presented to fluctuate up and down, and field strength size changes coal body porous dehiscence gap,
Coal and the potential energy of gas molecular action are reduced, strengthens gravitation between the two, final result is to speed up Methane Diffusion and increasing
Add desorption of mash gas amount.
The content of the invention
Part in view of the shortcomings of the prior art, it is an object of the invention to provide a kind of extra electric field to strengthen coal sample watt
This desorption experiment method, Methane Diffusion experiment is strengthened by extra electric field and desorption of mash gas is tested, to desorption of mash gas initial velocity（0
~1min）Carry out testing overall process power-up, and extra electric field strengthens desorption of mash gas experiment（0~5min）, by changing coal body
Physical property, coal body porous dehiscence gap, absorption potential is reduced, strengthen coal gas infiltration and flowing, the purpose is to Study on Coal and gas to dash forward
Go out index, improve gas pumping rate.
The purpose of the present invention is achieved through the following technical solutions：
A kind of extra electric field strengthens coal sample desorption of mash gas test method, is carrying out coal sample gas diffusion initial speed determination test and coal
During sample desorption of mash gas is tested, extra electric field is applied to coal sample.
Specifically, the coal sample gas diffusion initial speed determination test method comprises the following steps that：
Step1, assembling bleeding device, coal sample is put into the sample bottle of gas diffusion initial speed analyzer（10）In, in sample bottle
Lower end sets insulating base（11）And in insulating base（11）Corresponding sample bottle（10）Battery lead plate is placed in the slot of both sides（9）And
It is fixed, by battery lead plate（9）Wiring point pass through wire（18）Connect high voltage power supply（12）, then in insulating base（11）Surrounding is consolidated
Surely Shell Plate is protected（8）；
Step2, airtight test, check sample bottle（10）With the pipeline communication air-tightness of gas diffusion initial speed analyzer, close
Lattice are then carried out in next step；
Step3, gas diffusion initial speed measure：Open high voltage power supply（12）, apply extra electric field, to sample bottle（10）In coal
Vavuum pump is closed after sample degassing 1.5h（7）, under 0.1MPa the blowing pressures, to sample bottle（10）Middle coal sample carries out gas adsorption
1.5h, inflation is closed, to diffusing space（5）It is de-gassed 1 minute.
Specifically, the coal sample desorption of mash gas test method step is as follows：
Step A, coal sample is prepared, after coal sample is crushed, be sieved into the coal sample of certain particle diameter, be put into drying baker and toast 2h, so
Afterwards, drying coal sample is put into coal sample tank, is de-gassed processing, it is close after coal sample is taken out when it is 10Pa that vavuum pump, which shows pressure,
Close and seal up for safekeeping；
Step B, extra electric field processing, weigh the coal sample that appropriate degassing process is crossed and load coal sample bottle（17）In, both ends are conductive
The upper and lower battery lead plate of coal sample power-up clamper is positioned over after paper closing（9）Between, tighten bolt（13）Coal sample is clamped, with farad
Cage（19）After buckling well, high voltage power supply is opened, applies the electric field of different field strength to coal sample by adjusting voltage；
Step C, by the coal sample being disposed in Step B rapidly from coal sample bottle（17）It is transferred to coal sample tank（20）In, by coal sample
Tank（20）It is connected after tightening with experimental system, and checks air-tightness；
Step D, according to coal sample adsorption-desorption test procedure, adsorption-desorption experiment is carried out to coal sample.
In order to preferably realize the present invention, the field strength of the extra electric field is 400V/cm~2400V/cm.
Further, the field strength adjustment control of the extra electric field is 400V/cm, 1200V/cm and 2400V/cm.
Further, in the Step3, specific degasification process is：In sample bottle（10）With diffusing space（5）Connected
Start manual time-keeping simultaneously, close sample bottle during 10s（10）Corresponding valve, write down mercury column meter（1）Upper and lower liquid level readings, it can count
Calculate P1, open valve corresponding to sample bottle during 45s again, turn off valve corresponding to sample bottle during 60s, read mercury column meter again
About 1 liquid level readings P2, calculated：△P=P2-P1。
Preferably, the insulating base（11）With protection Shell Plate（8）For insulating synthetic resin plate.
Further, the insulating base（11）With protection Shell Plate（8）For polyamide board.
Preferably, the battery lead plate（9）For copper plate, the battery lead plate（9）On be provided with binding post（91）, by connecing
Terminal（91）Connecting wire（18）.
Further, the battery lead plate（9）Thickness be 4mm.
The present invention compared with the prior art, has advantages below and beneficial effect：
1st, the present invention coal body porous dehiscence gap, reduces absorption potential, strengthens coal gas infiltration and stream by changing coal body physical property
It is dynamic, improve gas pumping rate.
, the inventive method experiment verify, a feature field strength 400v/cm be present for the coal of different rank, 0~
The power-up of 1min desorption quantities improves 10%~40% compared with not powered.
, the inventive method carry out coal sample gas adsorption desorption experiment result show, for different rank coal exist
One feature field strength 1200v/cm, 0~5min desorption quantity power-up improves 20%~40% compared with not powered.
Brief description of the drawings
The extra electric field that Fig. 1 is the present invention strengthens Methane Diffusion apparatus structure schematic diagram.
Fig. 2 is the power-up device structural representation that extra electric field of the present invention strengthens Methane Diffusion device.
The adsorption-desorption coal sample that Fig. 3 is the present invention powers up clamping device structural representation.
Fig. 4 is faraday cup structural representation in the present invention.
Fig. 5 is the gas adsorption desorption apparatus connection diagram of the present invention.
Wherein：1st, mercury column meter, 2, glass tube, 3 glass two-port valves, 4, glass three-way valve, 5, diffuse space, 6, methane bag,
7th, vavuum pump, 8, protection shell, 9, pole plate, 10, sample bottle, 11, insulating base, 12, high voltage power supply, 13, bolt, 14, screw,
15th, pillar, 16, nylon sheet, 17, plastics coal sample bottle, 18, wire, 19, faraday cup, 20, coal sample tank, 21, data acquisition unit,
22nd, computer, 23, valve, 24, with reference to tank, 25, water bath with thermostatic control, 26, vavuum pump, 27, methane bottle, 28, small graduated cylinder, 29, a large amount of
Cylinder, 91, binding post.
Embodiment
The present invention is described in further detail with reference to embodiment, but the implementation of the present invention is not limited to this.
Embodiment
A kind of extra electric field strengthens coal sample desorption of mash gas test method, is carrying out coal sample gas diffusion initial speed determination test
During being tested with coal sample desorption of mash gas, extra electric field is applied to coal sample.
Specifically, as depicted in figs. 1 and 2, the coal sample gas diffusion initial speed determination test method comprises the following steps that：
Step1, assembling bleeding device, coal sample is put into the sample bottle of gas diffusion initial speed analyzer（10）In, in sample bottle
Lower end sets insulating base（11）And in insulating base（11）Corresponding sample bottle（10）Battery lead plate is placed in the slot of both sides（9）And
It is fixed, by battery lead plate（9）Wiring point pass through wire（18）Connect high voltage power supply（12）, then in insulating base（11）Surrounding is consolidated
Surely Shell Plate is protected（8）；
Step2, airtight test, check sample bottle（10）With the pipeline communication air-tightness of gas diffusion initial speed analyzer, close
Lattice are then carried out in next step；
Step3, gas diffusion initial speed measure：Open high voltage power supply（12）, apply extra electric field, to sample bottle（10）In coal
Vavuum pump is closed after sample degassing 1.5h（7）, under 0.1MPa the blowing pressures, to sample bottle（10）Middle coal sample carries out gas adsorption
1.5h, inflation is closed, to diffusing space（5）It is de-gassed 1 minute.
Specifically, as shown in Fig. 3, Fig. 4 and Fig. 5, the coal sample desorption of mash gas test method step is as follows：
Step A, coal sample is prepared, after coal sample is crushed, be sieved into the coal sample of certain particle diameter, be put into drying baker and toast 2h, so
Afterwards, drying coal sample is put into coal sample tank, is de-gassed processing, it is close after coal sample is taken out when it is 10Pa that vavuum pump, which shows pressure,
Close and seal up for safekeeping；
Step B, extra electric field processing, weigh the coal sample that appropriate degassing process is crossed and load coal sample bottle（17）In, both ends are conductive
The upper and lower battery lead plate of coal sample power-up clamper is positioned over after paper closing（9）Between, tighten bolt（13）Coal sample is clamped, with farad
Cage（19）After buckling well, high voltage power supply is opened, applies the electric field of different field strength to coal sample by adjusting voltage；
Step C, by the coal sample being disposed in Step B rapidly from coal sample bottle（17）It is transferred to coal sample tank（20）In, by coal sample
Tank（20）It is connected after tightening with experimental system, and checks air-tightness；
Step D, according to coal sample adsorption-desorption test procedure, adsorption-desorption experiment is carried out to coal sample.
In order to preferably realize the present invention, the field strength of the extra electric field is 400V/cm~2400V/cm.
Further, the field strength adjustment control of the extra electric field is 400V/cm, 1200V/cm and 2400V/cm.
Further, in the Step3, specific degasification process is：In sample bottle（10）With diffusing space（5）Connected
Start manual time-keeping simultaneously, close sample bottle during 10s（10）Corresponding valve, write down mercury column meter（1）Upper and lower liquid level readings, it can count
Calculate P1, open valve corresponding to sample bottle during 45s again, turn off valve corresponding to sample bottle during 60s, read mercury column meter again
About 1 liquid level readings P2, calculated：△P=P2-P1。
Preferably, the insulating base（11）With protection Shell Plate（8）For insulating synthetic resin plate.
Further, the insulating base（11）With protection Shell Plate（8）For polyamide board.
Preferably, the battery lead plate（9）For copper plate, the battery lead plate（9）On be provided with binding post（91）, by connecing
Terminal（91）Connecting wire（18）.
Further, the battery lead plate（9）Thickness be 4mm.
When being tested using the inventive method,
First, gas diffusion initial speed determination test
Air-tightness is first checked for, to sample bottle（10）Middle addition 3.5g coal samples, determine sample bottle（10）Number, to insulating base
（11）Corresponding groove carries out battery lead plate（9）It is fixed, battery lead plate（9）And high voltage power supply（12）Pass through wire（18）Connection, open
High voltage power supply（12）, it is powered up, vavuum pump is closed after the 1.5h that deaerated to coal sample（7）, inflation（The blowing pressure is 0.1MPa）Make
Coal sample adsorption gas 1.5h, inflation is closed, to diffusing space（5）It is de-gassed one minute, opens sample bottle（10）Corresponding
Valve, in sample bottle（10）With diffusing space（5）Start manual time-keeping while connected, close valve during 10s, write down mercury column meter
（1）Upper and lower liquid level readings, P can be calculated1, open valve during 45s again, turn off valve during 60s, read mercury column meter again（1）
Upper and lower liquid level readings P2, calculated：△P=P2~P1, the whole power-up of experimentation.
2nd, coal sample gas adsorption desorption experiment
1st, coal sample to be tested is put into drying baker and dries 2h, it is closed after taking-up to seal up for safekeeping, so as to which the moisture in coal sample can be sloughed, reduce
Influence of the coal sample coal residual moisture to experimental result.
2nd, a certain amount of coal sample is weighed, coal sample tank can be filled as far as possible（20）, open system pipeline control valve, coal sample tank（20）
Connecting valve and vavuum pump（26）Connection, and it is closed to keep high-pressure aerated unit and desorption unit, carries out vacuum outgas,
Stop when vacuum meter shows that pressure system pressure value is 10Pa.
3rd, clamper is powered up to plastics coal sample bottle with coal sample（17）Middle coal sample carries out different field strength processing, by coal sample tank（20）
Wipe clean, after treating coal sample power-up, be quickly charged with coal sample tank（20）, it is connected after tightening with experimental system, and to connecting line
And coal sample tank carries out airtight test.
If the 4th, open water bath with thermostatic control after airtight test system air-tightness is intact（25）, water bath with thermostatic control（25）Temperature is set
For 30 ± 1 DEG C, it is always maintained to experiment terminating, ensures that the temperature of whole system is constant in experimentation, reduces temperature to reality
Test the influence of result；
5th, the valve of inflation unit control is opened（23）, being filled with certain pure methane gas makes methane gas in tank reach design pressure
After force value（The pressure for reaching experimental design adsorption equilibrium is calculated before experiment）, blinded off a line after pressure gauge is stable and coal sample tank
（20）Valve, by 24~more than 48h absorption, make up to design adsorption equilibrium pressure；
6th, before methane gas desorption measure is carried out to coal sample, to big graduated cylinder（29）, small graduated cylinder（28）Initial scale value is read, is remembered
Record atmospheric pressure, indoor temperature；Coal sample tank is quickly opened before experiment first（20）Desorb valve and big graduated cylinder（29）Connection valve, put
The free gas gone out in coal sample tank, treat coal sample tank（20）Gauge hand be grouped into zero after, rapidly coal sample tank to be desorbed
（20）Desorption of mash gas instrument is connected, opens coal sample tank（20）Stopwatch is pressed rapidly when desorbing valve, and the digital independent of desorption quantity is also same
Step starts, and reads a numerical value every 10s clocks in desorption early stage, when gas desorption quantity is less than a certain setting value in 10s, successively
Extend the reading duration, ensure accuracy of reading, the data of actual measurement will also be converted into the volume under standard state, and reduction formula is as follows：
In formula：
V0Desorption of mash gas total amount under-standard state, cm3；
Desorption of mash gas total amount, cm are surveyed under V-experimental situation3；
twWater temperature in-buret, DEG C
Pa- atmospheric pressure, Pa；
hw- read data when buret in water-column, mm；
Saturated vapor pressure under Ps-wt, Pa.
In summary, by the description of the present embodiment, those skilled in the art can be made preferably to implement this programme.
Claims (10)
1. a kind of extra electric field strengthens coal sample desorption of mash gas test method, it is characterised in that：Carrying out coal sample Methane Diffusion initial velocity
During spending determination test and the experiment of coal sample desorption of mash gas, extra electric field is applied to coal sample.
2. a kind of extra electric field according to claim 1 strengthens coal sample desorption of mash gas test method, it is characterised in that described
Coal sample gas diffusion initial speed determination test method comprises the following steps that：
Step1, assembling bleeding device, coal sample is put into the sample bottle of gas diffusion initial speed analyzer（10）In, in sample bottle
Lower end sets insulating base（11）And in insulating base（11）Corresponding sample bottle（10）Battery lead plate is placed in the slot of both sides（9）And
It is fixed, by battery lead plate（9）Wiring point pass through wire（18）Connect high voltage power supply（12）, then in insulating base（11）Surrounding is consolidated
Surely Shell Plate is protected（8）；
Step2, airtight test, check sample bottle（10）With the pipeline communication air-tightness of gas diffusion initial speed analyzer, close
Lattice are then carried out in next step；
Step3, gas diffusion initial speed measure：Open high voltage power supply（12）, apply extra electric field, to sample bottle（10）In coal
Vavuum pump is closed after sample degassing 1.5h（7）, under 0.1MPa the blowing pressures, to sample bottle（10）Middle coal sample carries out gas adsorption
1.5h, inflation is closed, to diffusing space（5）It is de-gassed 1 minute.
3. a kind of extra electric field according to claim 1 strengthens coal sample desorption of mash gas test method, it is characterised in that described
Coal sample desorption of mash gas test method step is as follows：
Step A, coal sample is prepared, after coal sample is crushed, be sieved into the coal sample of certain particle diameter, be put into drying baker and toast 2h, so
Afterwards, drying coal sample is put into coal sample tank, is de-gassed processing, it is close after coal sample is taken out when it is 10Pa that vavuum pump, which shows pressure,
Close and seal up for safekeeping；
Step B, extra electric field processing, weigh the coal sample that appropriate degassing process is crossed and load coal sample bottle（17）In, both ends are conductive
The upper and lower battery lead plate of coal sample power-up clamper is positioned over after paper closing（9）Between, tighten bolt（13）Coal sample is clamped, with farad
Cage（19）After buckling well, high voltage power supply is opened, applies the electric field of different field strength to coal sample by adjusting voltage；
Step C, by the coal sample being disposed in Step B rapidly from coal sample bottle（17）It is transferred to coal sample tank（20）In, by coal sample
Tank（20）It is connected after tightening with experimental system, and checks air-tightness；
Step D, according to coal sample adsorption-desorption test procedure, adsorption-desorption experiment is carried out to coal sample.
4. coal sample desorption of mash gas test method, its feature are strengthened according to any described a kind of extra electric field in claims 1 to 3
It is：The field strength of the extra electric field is 400V/cm~2400V/cm.
5. a kind of extra electric field according to claim 4 strengthens coal sample desorption of mash gas test method, it is characterised in that：It is described
The field strength adjustment control of extra electric field is 400V/cm, 1200V/cm and 2400V/cm.
6. a kind of extra electric field according to claim 2 strengthens coal sample desorption of mash gas test method, it is characterised in that described
In Step3, specific degasification process is：In sample bottle（10）With diffusing space（5）Start manual time-keeping while connected, during 10s
Close sample bottle（10）Corresponding valve, write down mercury column meter（1）Upper and lower liquid level readings, P can be calculated1, sample is opened again during 45s
Valve corresponding to bottle, valve corresponding to sample bottle is turned off during 60s, read mercury column meter liquid level readings P about 1 again2, counted
Calculate：△P=P2-P1。
7. a kind of extra electric field according to claim 2 strengthens coal sample desorption of mash gas test method, it is characterised in that：It is described
Insulating base（11）With protection Shell Plate（8）For insulating synthetic resin plate.
8. a kind of extra electric field according to claim 2 or 7 strengthens coal sample desorption of mash gas test method, it is characterised in that：
The insulating base（11）With protection Shell Plate（8）For polyamide board.
9. a kind of extra electric field according to Claims 2 or 3 strengthens coal sample desorption of mash gas test method, it is characterised in that：
The battery lead plate（9）For copper plate, the battery lead plate（9）On be provided with binding post（91）, pass through binding post（91）Connecting wire
（18）.
10. a kind of extra electric field according to claim 9 strengthens coal sample desorption of mash gas test method, it is characterised in that：Institute
State battery lead plate（9）Thickness be 4mm.
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| CN108593492A (en) * | 2018-04-27 | 2018-09-28 | 河南理工大学 | It is a kind of to sentence the system and method for knowing gas adsorption desorption advantage field strength |
| CN110806343A (en) * | 2019-11-28 | 2020-02-18 | 河南理工大学 | Coal gas production experiment system under action of external electric field and use method thereof |
| CN112945803A (en) * | 2021-02-04 | 2021-06-11 | 中国矿业大学 | Device and method for measuring diffusion speed of externally-applied pulse reinforced gas under coal matrix |
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Application publication date: 20180313 |