CN115980302A - Device for testing gas desorption efficiency of physically-simulated microorganism-enhanced coal bed - Google Patents
Device for testing gas desorption efficiency of physically-simulated microorganism-enhanced coal bed Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 125
- 238000012360 testing method Methods 0.000 title claims abstract description 30
- 238000003795 desorption Methods 0.000 title claims abstract description 22
- 244000005700 microbiome Species 0.000 title claims abstract description 13
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 36
- 241000894006 Bacteria Species 0.000 claims description 14
- 239000007788 liquid Substances 0.000 claims description 13
- 239000000843 powder Substances 0.000 claims description 12
- 238000005303 weighing Methods 0.000 claims description 12
- 230000000813 microbial effect Effects 0.000 claims description 11
- 238000005259 measurement Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 8
- 238000007789 sealing Methods 0.000 claims description 7
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 4
- 241000193830 Bacillus <bacterium> Species 0.000 claims description 3
- 241000193403 Clostridium Species 0.000 claims description 3
- 238000000605 extraction Methods 0.000 claims description 3
- 238000004868 gas analysis Methods 0.000 claims description 3
- 230000006872 improvement Effects 0.000 claims description 3
- 238000010298 pulverizing process Methods 0.000 claims description 3
- 238000010998 test method Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 230000003416 augmentation Effects 0.000 claims 1
- 238000001514 detection method Methods 0.000 abstract description 4
- 239000011148 porous material Substances 0.000 abstract 2
- 230000009471 action Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000001580 bacterial effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
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Abstract
The invention relates to the technical field of coal bed gas detection devices, and particularly discloses a device for testing the desorption efficiency of physically simulating microorganism-enhanced coal bed gas, wherein a transparent box body is provided with a first cavity and a second cavity, the top of the first cavity is provided with a first pressure gauge and a first portable methane tester, the top of the second cavity is provided with a second pressure gauge and a second portable methane tester, two outlets of an air inlet tee joint are respectively connected with a first air inlet pipe and a second air inlet pipe, the first air inlet pipe is provided with a first rotor flowmeter and a first valve, the second air inlet pipe is provided with a second rotor flowmeter and a second valve, a first exhaust pipe with an air inlet end extending into the first cavity is provided with a first check valve and a first micro-pore plate flowmeter, a second exhaust pipe with an air inlet end extending into the second cavity is provided with a second check valve and a second micro-pore plate flowmeter, and the input end of a vacuum pump is connected with the output ends of the first exhaust pipe and the second exhaust pipe; so as to accurately test the residual gas content of the coal bed.
Description
Technical Field
The invention relates to the technical field of coal bed gas detection devices, in particular to a device for testing the desorption efficiency of physically simulating microorganisms to strengthen coal bed gas.
Background
The coal bed gas content is the most key basic parameter for preventing mine gas and is related to classification of mine and regional gas grades. At present, various devices for testing the coal seam gas content in the market are difficult to directly test the residual gas content of coal, and the residual gas content of the coal seam is estimated through a model (Lagrange equation), so that the original gas content of the coal seam is underestimated.
Therefore, a residual gas content testing device for coal is needed urgently, so that the testing of the gas content of the coal bed is more accurate, and the safe and efficient production of the power-assisted coal mine is realized.
Disclosure of Invention
The invention aims at solving the problem that a coal bed gas detection device in the prior art is difficult to accurately test the residual gas content of a coal bed, and designs a device for testing the desorption efficiency of the physically simulated microorganism reinforced coal bed gas.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a device of little biological enhancement coal seam gas desorption efficiency test of physical simulation, be equipped with first cavity and second cavity on the transparent box horizontal direction, the top of first cavity and second cavity is removable respectively installs the top cap, first manometer and first portable methane tester are installed at first cavity inner wall top, second manometer and the portable methane tester of second are installed to second cavity inner wall top, the both ends mouth of inlet tee bend bottom is connected with the bottom respectively and extends to first intake pipe in the first cavity and bottom extend to second intake pipe in the second cavity, first rotor flowmeter and first valve are installed to the top position that is close to of first intake pipe, second rotor flowmeter and second valve are installed to the top position that is close to of second intake pipe, the inlet end of first blast pipe extends to in the first cavity, install first check valve and first micro orifice plate flowmeter on the first blast pipe, the inlet end of second blast pipe extends to in the second cavity, install second check valve and second micro orifice plate on the second blast pipe, the input of vacuum pump with the output of first blast pipe is connected.
Preferably, a clamping groove is formed in the outer edge of the top end of the transparent box body, a top cover used for sealing the first cavity and the second cavity is clamped in the clamping groove in the horizontal direction, a through hole which is sleeved with the first air inlet pipe, the second air inlet pipe, the first exhaust pipe and the second exhaust pipe is formed in the top cover, and an air sealing structure is arranged at the through hole.
Preferably, the transparent box body is vertically provided with scale marks.
Preferably, the first cavity and the second cavity are respectively of a cubic cavity structure with the side length of 200 mm.
Preferably, still include pectination pore-forming device, pectination pore-forming device include with first cavity and second cavity follow the base plate and the top vertical fixation that vertical slip joint matches the body of rod of base plate bottom surface.
A testing method for residual gas content of a coal seam comprises the following steps:
s1, firstly, testing a coal core collected under a coal mine by using a DGC type gas content direct measurement device to measure the loss gas content W 1 And analyzing the gas content W at normal pressure before crushing 2 And analysis of gas content by pulverization 3 ；
S2, weighing a certain mass m from the powdered coal sample tested by the DGC type gas content direct measurement device 0 Mixing the coal sample with 20% hydrochloric acid solution in a first cavity uniformly according to a mass ratio of 1.5;
s3, covering a top cover, closing the first valve and the second valve, starting the vacuum pump, setting the negative pressure value to be-10 kpa until the numerical value of the first micro orifice plate flowmeter is stable, and reading the numerical value at the moment to be the gas pure quantity w 0 ；
S4, formula W Residue of ＝w 0 /m 0 Calculating the residual gas content W of the coal sample of unit mass Residue of The value of (d);
s5, formula W Original ＝W 1 +W 2 +W 3 +W Residue(s) of Calculating the original gas content W of the coal seam Original The numerical value of (c).
A test method for physically simulating microbial enhanced coal bed gas desorption efficiency comprises the following steps:
s1, weighing a coal sample with a certain mass from a powdered coal sample tested by a DGC type gas content direct measurement device, and dividing the coal sample into a common coal sample and a bacteria liquid-added coal sample;
s2, taking 6Kg of coal powder from the coal sample with the bacteria liquid, uniformly mixing 1.5Kg of bacteria liquid with the coal powder, flatly paving the mixture layer by layer in a first cavity until the height of the coal sample is 15cm, weighing and recording the mass m of the coal sample with the bacteria liquid 1 ；
S3, taking 6Kg of coal powder from a common coal sample, uniformly mixing 1.5Kg of sterilized pure water with the coal powder, flatly paving the mixture layer by layer in a second cavity until the height of the coal sample is 15cm, weighing and recording the mass m of the common coal sample 2 ；
S4, respectively processing honeycomb holes on the coal samples in the first cavity and the second cavity by using rod bodies of the comb-shaped hole forming device to form a gas escape channel;
s5, mounting a first pressure gauge and a first portable methane tester on the top of the inner wall of the first cavity, mounting a second pressure gauge and a second portable methane tester on the top of the inner wall of the second cavity, and mounting a top cover;
s6, respectively inserting the bottom ends of the first air inlet pipe and the second air inlet pipe into the corresponding coal samples;
s7, opening the first valve and the second valve;
s8, injecting CH into the air inlet end of the air inlet tee joint 4 Closing the first one-way valve and the second one-way valve after air inlet for 2min, and respectively recording numerical values Q of the first micro-orifice plate flowmeter and the second micro-orifice plate flowmeter Row 1 、Q Row 2 ；
S9, continuously injecting CH into the air inlet end of the air inlet tee joint 4 While observing the first pressure gaugeAnd the air pressure value displayed by the second pressure gauge stops air inlet when the air pressure value reaches the original coal bed gas pressure, closes the first valve and the second valve, reads out the data of the first rotor flowmeter and the second rotor flowmeter so as to correspondingly calculate Q Inlet 1 And Q Step 2 ；
S10, recording the reading of the first pressure gauge and the reading of the second pressure gauge every two hours;
s11, calculating CH in the first cavity 4 Content Q Container 1 ＝Q Step 1 -Q Row 1 And CH in the second cavity 4 Content Q Container 2 ＝Q Step 2 -Q Row 2 ；
S12, opening the first check valve and the second check valve, starting the vacuum pump, setting the negative pressure value to be-10 kpa, and respectively recording numerical values Q of the first micro orifice plate flowmeter and the second micro orifice plate flowmeter once every 12 hours x1 、Q x2 Continuously recording for 7 days, checking out CH accumulated after 7 days 4 Content Q 7.1 And Q 7.2 ；
S13, according to a formula eta 1 ＝Q 7.1 /Q Container 1 And η 2 ＝Q 7.2 /Q Container 2 Respectively calculating the gas extraction rate within 7 days corresponding to the first cavity and the second cavity;
s14, according to the formula/[ eta ] 2 And (5) calculating the improvement rate of the microbial enhanced gas analysis efficiency by multiplying by 100%.
Preferably, the bacterial liquid in step S2 includes, but is not limited to, bacillus and clostridium.
Preferably, when the coal samples are tiled in the steps S2 and S3, the thickness of each layer of coal sample is 1-2 cm, and the upper layer is paved after the lower layer is compacted.
Compared with the prior art, the invention has the beneficial effects that:
1. the device for testing the gas desorption efficiency of the physically simulated microorganism reinforced coal bed eliminates the influence of pressure on the gas content when the gas content is measured, can analyze the difficult-to-analyze gas or the non-analyzable gas in the coal, and directly measures the residual gas content of the coal, so that the residual gas content of the coal bed can be accurately tested.
2. The device for testing the gas desorption efficiency of the physically simulated microorganism reinforced coal bed can measure and calculate the gas content of the coal bed under the original gas pressure condition of the coal bed; and the microbial enhanced coal bed gas desorption efficiency in a certain time is inspected.
3. The device for physically simulating the microorganism-enhanced coal bed gas desorption efficiency test has the advantages of simple overall structure, easiness in operation, low manufacturing cost and convenience in popularization and application in the field of gas detection.
Drawings
FIG. 1 is a schematic overall front view of the present invention;
FIG. 2 is a schematic perspective view of a comb-shaped hole forming device according to the present invention.
In the figure: 1-a transparent box body; 101-a first cavity; 102-a second cavity; 103-card slot; 104-a top cover; 105-a first pressure gauge;
106-a first portable methane tester; 107-a second pressure gauge; 108-a second portable methane tester;
2-a gas inlet tee;
3-a first air inlet pipe; 301-a first rotor flowmeter; 302-a first valve;
4-a second air inlet pipe; 401-a second rotameter; 402-a second valve;
5-a first exhaust pipe; 501-a first one-way valve; 502-a first micro-orifice plate flow meter;
6-a second exhaust pipe; 601-a second one-way valve; 602-a second micro-orifice plate flow meter;
7-a vacuum pump;
8-a comb-shaped pore-forming device; 801-a substrate; 802-rod body.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows: referring to fig. 1, the invention provides a technical scheme of a device for physically simulating a microorganism-enhanced coal bed gas desorption efficiency test, a transparent box body 1 is provided with a first cavity 101, the first cavity 101 is a cubic cavity structure with the side length of 200mm, the outer edge of the top end of the transparent box body 1 is provided with a clamping groove 103, the clamping groove 103 is clamped with a top cover 104 for sealing the first cavity 101 along the horizontal direction, the top cover 104 is provided with a through hole sleeved with a first air inlet pipe 3 and a first air outlet pipe 5, and the through hole is provided with an air sealing structure; in order to facilitate laying of the coal sample, the transparent box body 1 is vertically provided with scale marks; a first pressure gauge 105 and a first portable methane tester 106 are installed at the top of the inner wall of the first cavity 101, a port at the bottom of the air inlet tee joint 2 is connected with a first air inlet pipe 3, the bottom end of the first air inlet pipe 3 extends into the first cavity 101, a first rotor flowmeter 301 and a first valve 302 are installed at the position, close to the top, of the first air inlet pipe 3, the air inlet end of the first exhaust pipe 5 extends into the first cavity 101, a first check valve 501 and a first micro orifice flowmeter 502 are installed on the first exhaust pipe 5, and the input end of the vacuum pump 7 is connected with the output end of the first exhaust pipe 5.
A testing method for residual gas content of a coal seam comprises the following steps:
s1, firstly, testing a coal core collected under a coal mine by using a DGC type gas content direct measurement device to measure the loss gas content W 1 And analyzing the gas content W at normal pressure before crushing 2 And pulverizing the gas to analyze the gas content W 3 ；
S2, weighing a certain mass m from the powdered coal sample tested by the DGC type gas content direct measurement device 0 Mixing the coal sample with 20% hydrochloric acid solution uniformly in a first cavity 101 according to a mass ratio of 1;
s3, covering the top cover 104, closing the first valve 302 and the second valve 402, then starting the vacuum pump 7, setting the negative pressure value to-10 kpa until the numerical value of the first micro orifice plate flowmeter 502 is stable, and reading the numerical value at the moment to be the gas pure quantity w 0 ；
S4, formula W Residue(s) of ＝w 0 /m 0 Calculating the residual gas content W of the coal sample of unit mass Residue of The value of (d);
s5, formula W Original ＝W 1 +W 2 +W 3 +W Residue of Calculating the original gas content W of the coal bed Original The numerical value of (c).
Example two: referring to fig. 1-2, the invention provides a technical scheme, a device for physically simulating a microorganism enhanced coal bed gas desorption efficiency test, a transparent box body 1 is provided with a first cavity 101 and a second cavity 102 in the horizontal direction, the first cavity 101 and the second cavity 102 are respectively of a cubic cavity structure with the side length of 200mm, the outer edge of the top end of the transparent box body 1 is provided with a clamping groove 103, the clamping groove 103 is clamped with a top cover 104 for sealing the first cavity 101 and the second cavity 102 in the horizontal direction, the top cover 104 is provided with a through hole sleeved with a first air inlet pipe 3, a second air inlet pipe 4, a first exhaust pipe 5 and a second exhaust pipe 6, and the through hole is provided with an air sealing structure; in order to facilitate laying of the coal sample, the transparent box body 1 is vertically provided with scale marks; a first pressure gauge 105 and a first portable methane tester 106 are installed at the top of the inner wall of the first cavity 101, a second pressure gauge 107 and a second portable methane tester 108 are installed at the top of the inner wall of the second cavity 102, two ports at the bottom of the air inlet tee joint 2 are respectively connected with a first air inlet pipe 3 with the bottom end extending into the first cavity 101 and a second air inlet pipe 4 with the bottom end extending into the second cavity 102, a first rotor flowmeter 301 and a first valve 302 are installed at the position, close to the top, of the first air inlet pipe 3, a second rotor flowmeter 401 and a second valve 402 are installed at the position, close to the top, of the second air inlet pipe 4, the air inlet end of the first exhaust pipe 5 extends into the first cavity 101, a first check valve 501 and a first micro-orifice flowmeter 502 are installed on the first exhaust pipe 5, the air inlet end of the second exhaust pipe 6 extends into the second cavity 102, a second check valve 601 and a second micro-flow flowmeter 602 are installed on the second exhaust pipe 6, and the input end of 7 is connected with the output ends of the first exhaust pipe 5 and the second exhaust pipe 6;
the comb-shaped hole forming device 8 comprises a base plate 801 which is matched with the first cavity 101 and the second cavity 102 in a sliding and clamping mode along the vertical direction and a rod body 802 of which the top end is vertically fixed to the bottom surface of the base plate 801.
A test method for physically simulating microbial enhanced coal bed gas desorption efficiency comprises the following steps:
s1, weighing a coal sample with a certain mass from a powdered coal sample tested by a DGC type gas content direct measurement device, and dividing the coal sample into two processing groups, namely a common coal sample and a bacteria-added liquid coal sample;
s2, taking 6Kg of coal powder from the coal sample with the bacteria liquid, uniformly mixing 1.5Kg of bacteria liquid with the coal powder, flatly paving the mixture layer by layer in the first cavity 101 until the height of the coal sample is 15cm, weighing and recording the mass m of the coal sample with the bacteria liquid 1 ；
Wherein, the bacteria liquid contains decomposing bacteria such as bacillus, clostridium and the like, the thickness of each layer of coal sample is 1-2 cm when the coal sample is tiled, and the upper layer is paved after the lower layer is compacted.
S3, taking 6Kg of coal powder from a common coal sample, uniformly mixing 1.5Kg of sterilized pure water with the coal powder, flatly paving the mixture layer by layer in the second cavity 102 until the height of the coal sample is 15cm, weighing and recording the mass m of the common coal sample 2 ；
Wherein, when the coal sample is spread, the thickness of each layer of coal sample is 1-2 cm, and the upper layer is paved after the lower layer is compacted.
S4, respectively processing honeycomb holes on the coal samples in the first cavity 101 and the second cavity 102 by using the rod bodies 802 of the comb-shaped hole forming devices 8 to form gas escape channels;
s5, mounting a first pressure gauge 105 and a first portable methane tester 106 on the top of the inner wall of the first cavity 101, mounting a second pressure gauge 107 and a second portable methane tester 108 on the top of the inner wall of the second cavity 102, and then mounting a top cover 104;
s6, inserting the bottom ends of the first air inlet pipe 3 and the second air inlet pipe 4 into corresponding coal samples respectively;
s7, opening the first valve 302 and the second valve 402;
s8, injecting CH into the air inlet end of the air inlet tee joint 2 4 And after 2min of air inflow, closing the first check valve 501 and the second check valve 601, and respectively recording the numerical values Q of the first micro orifice plate flowmeter 502 and the second micro orifice plate flowmeter 602 Row 1 、Q Row 2 ；
S9, continuously injecting CH into the air inlet end of the air inlet tee joint 2 4 Simultaneously observing the gas pressure values displayed by the first pressure gauge 105 and the second pressure gauge 107, stopping gas inflow when the gas pressure value reaches the original coal bed gas pressure, closing the first valve 302 and the second valve 402, reading the data of the first rotor flowmeter 301 and the second rotor flowmeter 401, and correspondingly calculating Q Step 1 And Q Step 2 ；
S10, recording the readings of the first pressure gauge 105 and the second pressure gauge 107 every two hours;
s11, calculating CH in the first cavity 101 4 Content Q Container 1 ＝Q Step 1 -Q Row 1 And CH in the second cavity 102 4 Content Q Container 2 ＝Q Step 2 -Q Row 2 ；
S12, opening the first check valve 501 and the second check valve 601, opening the vacuum pump 7, setting the negative pressure value to-10 kpa, and recording the numerical value Q of the first micro orifice plate flowmeter 502 and the numerical value Q of the second micro orifice plate flowmeter 602 once every 12 hours respectively x1 、Q x2 Continuously recording for 7 days, checking out CH accumulated after 7 days 4 Content Q 7.1 And Q 7.2 ；
S13, according to a formula eta 1 ＝Q 7.1 /Q Container 1 And η 2 ＝Q 7.2 /Q Container 2 Respectively calculating the gas extraction rate within 7 days corresponding to the first cavity 101 and the second cavity 102;
s14, according to a formula eta 1 -η 2 /η 2 And (5) calculating the improvement rate of the microbial enhanced gas analysis efficiency by multiplying by 100%.
It should be noted that, in this document, relational terms such as first and second, and the like 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. Also, 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.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. The utility model provides a device of microbial augmentation coal seam gas desorption efficiency test which characterized in that includes:
the methane tester comprises a transparent box body (1), wherein a first cavity (101) and a second cavity (102) are arranged in the horizontal direction of the transparent box body (1), top covers (104) are respectively detachably mounted at the tops of the first cavity (101) and the second cavity (102), a first pressure gauge (105) and a first portable methane tester (106) are mounted at the top of the inner wall of the first cavity (101), and a second pressure gauge (107) and a second portable methane tester (108) are mounted at the top of the inner wall of the second cavity (102);
the two ports at the bottom of the air inlet tee joint (2) are respectively connected with a first air inlet pipe (3) with the bottom end extending into the first cavity (101) and a second air inlet pipe (4) with the bottom end extending into the second cavity (102), a first rotameter (301) and a first valve (302) are installed at the position, close to the top, of the first air inlet pipe (3), and a second rotameter (401) and a second valve (402) are installed at the position, close to the top, of the second air inlet pipe (4);
the gas inlet end of the first exhaust pipe (5) extends into the first cavity (101), and a first check valve (501) and a first micro orifice plate flowmeter (502) are mounted on the first exhaust pipe (5);
the air inlet end of the second exhaust pipe (6) extends into the second cavity (102), and a second check valve (601) and a second micro orifice plate flowmeter (602) are mounted on the second exhaust pipe (6); and
the input end of the vacuum pump (7) is connected with the output ends of the first exhaust pipe (5) and the second exhaust pipe (6).
2. The device for physically simulating the microbial enhanced coal bed gas desorption efficiency test according to claim 1, wherein: transparent box (1) top outer fringe is equipped with draw-in groove (103), draw-in groove (103) clamp along the horizontal direction have be used for sealing top cap (104) of first cavity (101) and second cavity (102), be equipped with on top cap (104) with the through-hole of first intake pipe (3), second intake pipe (4), first blast pipe (5) and second blast pipe (6) suit, and through-hole department is equipped with airtight structure.
3. The device for physically simulating the microbial enhanced coal bed gas desorption efficiency test according to claim 2, wherein: and the upper edge of the transparent box body (1) is vertically provided with scale marks.
4. The device for physically simulating the microbial enhanced coal bed gas desorption efficiency test according to claim 3, wherein: the first cavity (101) and the second cavity (102) are of cubic cavity structures with the side length of 200mm respectively.
5. The device for physically simulating the microorganism-enhanced coal bed gas desorption efficiency test according to claim 4, further comprising a comb-shaped hole forming device (8), wherein the comb-shaped hole forming device (8) comprises a base plate (801) which is matched with the first cavity (101) and the second cavity (102) in a sliding and clamping manner along the vertical direction, and a rod body (802) of which the top end is vertically fixed to the bottom surface of the base plate (801).
6. A testing method for residual gas content of a coal seam is characterized by comprising the following steps:
s1, firstly, testing a coal core collected under a coal mine by using a DGC type gas content direct measurement device to measure the loss gas content W 1 And analyzing the gas content W at normal pressure before crushing 2 Pulverizing and disintegratingGas content W 3 ；
S2, weighing a certain mass m from the powdered coal sample tested by the DGC type gas content direct measurement device 0 The coal sample is uniformly mixed with 20% hydrochloric acid solution in a first cavity (101) according to the mass ratio of 1;
s3, covering the top cover (104), closing the first valve (302) and the second valve (402), then starting the vacuum pump (7), setting the negative pressure value to be-10 kpa until the numerical value of the first micro orifice flowmeter (502) is stable, and reading the numerical value at the moment, namely the gas pure quantity w 0 ；
S4, formula W Residue of ＝w 0 /m 0 Calculating the residual gas content W of the coal sample of unit mass Residue of The value of (d);
s5, formula W Original (original) ＝W 1 +W 2 +W 3 +W Residue(s) of Calculating the original gas content W of the coal seam Original The numerical value of (c).
7. A test method for physically simulating microbial enhanced coal bed gas desorption efficiency is characterized by comprising the following steps:
s1, weighing a coal sample with a certain mass from a powdered coal sample tested by a DGC type gas content direct measurement device, and dividing the coal sample into a common coal sample and a bacteria liquid-added coal sample;
s2, taking 6Kg of coal powder from the coal sample with the bacteria liquid, uniformly mixing 1.5Kg of bacteria liquid with the coal powder, flatly paving the mixture layer by layer in the first cavity (101) until the height of the coal sample is 15cm, weighing and recording the mass m of the coal sample with the bacteria liquid 1 ；
S3, taking 6Kg of coal powder from a common coal sample, uniformly mixing 1.5Kg of sterilized pure water with the coal powder, flatly paving the mixture in a second cavity (102) layer by layer until the height of the coal sample is 15cm, weighing and recording the mass m of the common coal sample 2 ；
S4, respectively processing honeycomb holes on the coal samples in the first cavity (101) and the second cavity (102) by using a rod body (802) of the comb-shaped hole forming device (8) to form a gas escape channel;
s5, mounting a first pressure gauge (105) and a first portable methane tester (106) on the top of the inner wall of the first cavity (101), mounting a second pressure gauge (107) and a second portable methane tester (108) on the top of the inner wall of the second cavity (102), and mounting a top cover (104);
s6, inserting the bottom ends of the first air inlet pipe (3) and the second air inlet pipe (4) into corresponding coal samples respectively;
s7, opening the first valve (302) and the second valve (402);
s8, injecting CH into the air inlet end of the air inlet tee joint (2) 4 And after 2min of air inflow, closing the first check valve (501) and the second check valve (601), and respectively recording the numerical values Q of the first micro orifice plate flowmeter (502) and the second micro orifice plate flowmeter (602) Row 1 、Q Row 2 ；
S9, continuously injecting CH into the air inlet end of the air inlet tee joint (2) 4 Simultaneously observing the gas pressure values displayed by the first pressure gauge (105) and the second pressure gauge (107), stopping gas inflow when the gas pressure value reaches the original coal bed gas pressure, closing the first valve (302) and the second valve (402), reading the data of the first rotor flowmeter (301) and the second rotor flowmeter (401), and correspondingly calculating Q Step 1 And Q Step 2 ；
S10, recording the readings of the first pressure gauge (105) and the second pressure gauge (107) every two hours;
s11, calculating CH in the first cavity (101) 4 Content Q Container 1 ＝Q Inlet 1 -Q Row 1 And CH in the second cavity (102) 4 Content Q Container 2 ＝Q Step 2 -Q Row 2 ；
S12, opening the first check valve (501) and the second check valve (601), opening the vacuum pump (7), setting the negative pressure value to-10 kpa, and recording the numerical value Q of the first micro orifice plate flowmeter (502) and the second micro orifice plate flowmeter (602) once every 12 hours respectively x1 、Q x2 Continuously recording for 7 days, checking out CH accumulated after 7 days 4 Content Q 7.1 And Q 7.2 ；
S13, according to a formula eta 1 ＝Q 7.1 /Q Container 1 And η 2 ＝Q 7.2 /Q Container 2 Respectively calculating the gas in 7 days corresponding to the first cavity (101) and the second cavity (102)Extraction rate;
s14, according to the formula (eta) 1 -η 2 )/η 2 And (5) calculating the improvement rate of the microbial enhanced gas analysis efficiency by multiplying by 100%.
8. The method for testing the gas desorption efficiency of the physically simulated microorganism reinforced coal seam according to claim 7, wherein the method comprises the following steps: the bacteria liquid in step S2 includes bacillus and clostridium.
9. The method for testing the gas desorption efficiency of the physically simulated microorganism reinforced coal seam according to claim 7, wherein the method comprises the following steps: when the coal samples are tiled in the steps S2 and S3, the thickness of each layer of coal sample is 1-2 cm, and the upper layer is paved after the lower layer is compacted.
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| CN202211640286.0A CN115980302B (en) | 2022-12-19 | 2022-12-19 | Device for testing gas desorption efficiency of physical simulation microorganism reinforced coal bed |
| PCT/CN2024/077530 WO2024131994A1 (en) | 2022-12-19 | 2024-02-19 | Physical simulation device for testing microbial enhanced coal seam gas desorption efficiency |
| ZA2024/02478A ZA202402478B (en) | 2022-12-19 | 2024-03-27 | Device for testing efficiency of microbial enhanced coal seam gas desorption through physical simulation |
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| WO2024131994A1 (en) * | 2022-12-19 | 2024-06-27 | 安徽理工大学 | Physical simulation device for testing microbial enhanced coal seam gas desorption efficiency |
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| CN115980302B (en) | 2024-08-16 |
| WO2024131994A1 (en) | 2024-06-27 |
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Application publication date: 20230418 Assignee: Anhui Huainan Jinluer Gas Comprehensive Utilization Technology Co.,Ltd. Assignor: Anhui KUNLANG New Energy Technology Co.,Ltd. Contract record no.: X2024980014893 Denomination of invention: A device for physically simulating microbial enhanced coalbed methane desorption efficiency testing Granted publication date: 20240816 License type: Common License Record date: 20240918 |