CN114086941B - Test device and method for simulating underground coal gasification - Google Patents
Test device and method for simulating underground coal gasification Download PDFInfo
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- CN114086941B CN114086941B CN202111477378.7A CN202111477378A CN114086941B CN 114086941 B CN114086941 B CN 114086941B CN 202111477378 A CN202111477378 A CN 202111477378A CN 114086941 B CN114086941 B CN 114086941B
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- 239000003245 coal Substances 0.000 title claims abstract description 83
- 238000002309 gasification Methods 0.000 title claims abstract description 65
- 238000012360 testing method Methods 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims description 31
- 230000017525 heat dissipation Effects 0.000 claims abstract description 20
- 230000008859 change Effects 0.000 claims abstract description 14
- 238000000926 separation method Methods 0.000 claims abstract description 9
- 238000010998 test method Methods 0.000 claims abstract description 5
- 230000008569 process Effects 0.000 claims description 27
- 238000013016 damping Methods 0.000 claims description 26
- 239000003795 chemical substances by application Substances 0.000 claims description 10
- 239000011435 rock Substances 0.000 claims description 9
- 238000002485 combustion reaction Methods 0.000 claims description 7
- 239000003034 coal gas Substances 0.000 claims description 6
- 238000005553 drilling Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 230000008901 benefit Effects 0.000 claims description 4
- 238000007537 lampworking Methods 0.000 claims description 4
- 230000000712 assembly Effects 0.000 claims description 3
- 238000000429 assembly Methods 0.000 claims description 3
- 239000004927 clay Substances 0.000 claims description 3
- 239000004020 conductor Substances 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 239000012634 fragment Substances 0.000 claims description 3
- 230000005389 magnetism Effects 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 230000003647 oxidation Effects 0.000 claims description 3
- 238000007254 oxidation reaction Methods 0.000 claims description 3
- 238000000197 pyrolysis Methods 0.000 claims description 3
- 230000009467 reduction Effects 0.000 claims description 3
- 230000003139 buffering effect Effects 0.000 abstract description 4
- 239000007787 solid Substances 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 11
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000005457 optimization Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/295—Gasification of minerals, e.g. for producing mixtures of combustible gases
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- Life Sciences & Earth Sciences (AREA)
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- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geophysics (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
Abstract
The invention discloses a test device and a test method for simulating underground coal gasification, wherein the test device comprises a base, the upper surface of the base is a smooth surface, a plurality of surrounding baffle plates are distributed on the upper circumference of the base in a closed manner, a guide rod is fixed on one surface of the outer side of each surrounding baffle plate, the guide rod is connected with a guide block in a sliding manner, and the guide block is fixed in the base, so that the surrounding baffle plates are arranged on the base in a sliding manner; the base periphery is fixed with many spinal branch posts that lie in every and enclose the separation blade center, common fixedly connected with solid fixed ring on the pillar, gu rotationally be equipped with the ring gear on the fixed ring, circumference distribution articulates on the ring gear has many buffering link assembly, every buffering link assembly's the other end articulates to the centre of corresponding enclosing the separation blade. Compared with the prior art, the invention can change the volume of the test container, the coal bed model can expand under certain resistance when the coal bed burns, and the heat dissipation condition of heat in the coal bed can be simulated according to the specific heat capacity of the coal bed.
Description
Technical Field
The invention relates to the technical field of underground coal gasification, in particular to a test device and a test method for simulating underground coal gasification.
Background
The underground coal gasification is a process of burning underground coal under control to generate combustible gas and chemical raw materials through the thermochemical action of the coal, and the underground coal bed is constructed into a closed gasification furnace by the underground coal gasification technology, and an air inlet hole and an air outlet hole are arranged and are integrated with a gasification channel and the coal bed. Although the underground coal gasification technology improves the utilization rate of coal resources, the damage to the ground surface and the environment caused by coal exploitation is greatly reduced, and the emission of CO2 and other harmful gases is reduced.
In the prior art, underground coal gasification model tests, field tests and numerical simulation are performed on chemical reactions and parameters occurring in gasification channels. A large amount of data is accumulated, and important contribution is made to the exploitation work guidance. But less tests are carried out on the channel change formed by the dynamic movement of the coal wall and the movement of the gaseous temperature field in the channel along with the gasification process in the reaction process of the underground gasification coal bed. The underground coal gasifying process includes violent burning chemical reaction and multiphase endothermic chemical reaction, and the process includes gas flow, heat transfer and coupling of the chemical reaction, and the gasifying channel has one shape and size, and the two processes are mutually dependent and interacted and have important reference value to the efficiency of the exploitation and the safety of the exploitation. The existing underground coal-simulated gasification test equipment is used for placing a coal bed model in a sealed and heat-insulating container for combustion test, so that the influence of thermal expansion and cold contraction of the coal bed on the shape of a gasification channel during combustion cannot be simulated, the boundary heat dissipation condition of the coal bed combustion cannot be accurately simulated, and the research on the aspect cannot be satisfied.
Accordingly, there is a need to provide a test apparatus for simulating underground gasification of coal to solve the above-mentioned problems in the background art.
Disclosure of Invention
In order to achieve the above purpose, the present invention provides the following technical solutions: the test device for simulating underground coal gasification comprises a base, wherein the upper surface of the base is a smooth surface, a plurality of surrounding baffle plates are distributed on the upper circumference of the base in a closed manner, a guide rod is fixed on one surface of the outer side of each surrounding baffle plate, the guide rod is connected with a guide block in a sliding manner, and the guide block is fixed in the base, so that the surrounding baffle plates are arranged on the base in a sliding manner;
the base periphery is fixed with many spinal branch posts that lie in every and enclose the separation blade center, common fixedly connected with solid fixed ring on the pillar, gu the fixed ring enclose when enclosing the separation blade and remove when keeping away from the center outside the annular scope that becomes, gu be equipped with the ring gear rotatably on the fixed ring, circumference distribution articulates on the ring gear has many buffering link assemblies, every buffering link assembly's the other end articulates to the centre of enclosing the separation blade that corresponds.
Further, preferably, a driving gear meshed with the gear ring is arranged on one side of the gear ring, the driving gear is rotatably connected in the fixed ring, a motor is fixed below the fixed ring, and an output shaft of the motor is connected into the driving gear.
Further, preferably, a sliding pad is provided in the contact surface between the guide block and the guide rod.
Further, as an preference, the two sides of the enclosing sheet are symmetrically provided with expansion sheets, and the expansion sheets can be accommodated in the enclosing sheet and are slidably connected with the enclosing sheet.
Further, as an optimization, the expansion sheets at two sides of each enclosing sheet are symmetrically connected to corresponding struts respectively through an expansion connecting rod, and two ends of the expansion connecting rod are hinged with the expansion sheets and the struts respectively;
and when the length and the inclination angle of the expansion connecting rod enable each enclosing baffle plate to synchronously slide for any length along the guide rod, the expansion plates are driven to stretch and retract, so that the adjacent expansion plates are always attached.
Further, as an optimization, a magnetic column is arranged on one side surface of the telescopic expansion sheet far away from the enclosing sheet, the magnetic column is made of soft magnetic conductive materials, and magnetism of the magnetic columns in the two adjacent expansion sheets is opposite.
Further, preferably, the buffer connecting rod assembly comprises a frame and a damping rod, one end of the frame is hinged with the gear ring, the damping rod is fixed in the frame, a piston rod of the damping rod is slidably connected with the frame, and the tail end of the damping rod is hinged into the surrounding baffle;
and a buffer spring is sleeved on the periphery of the damping rod, one end of the buffer spring is fixedly connected with the frame, and the other end of the buffer spring is fixedly connected with a piston rod of the damping rod.
Further, as an optimization, the outer wall of the piston rod of the damping rod is provided with insections, the inner wall of the frame, which is attached to the piston rod, is respectively provided with an electromagnet and a magnetic conduction block, and one sides of the electromagnet and the magnetic conduction block, which are far away from the piston rod, are respectively connected with the frame through separating springs;
and the separating spring enables the electromagnet and the magnetic conduction block to be far away from the piston rod in a natural state, and when the electromagnet is electrified, the electromagnet adsorbs the magnetic conduction block to clamp the piston rod.
Further, preferably, the inner sides of the enclosing sheet and the expansion sheet are heat dissipation plates, the heat dissipation plates are made of high heat conduction materials, heat conduction pipes are distributed on the inner walls of the heat dissipation plates, and the heat conduction pipes are connected to an external circulating pump and a heat source.
Also included is a test method for simulating underground gasification of coal,
s1, in a state that the electromagnet is electrified to limit the movement of the damping rod, the driving motor enables the gear ring to rotate, and the buffer connecting rod assembly can drive each surrounding baffle to synchronously move so as to adjust the volume of the test container;
s2, paving a gasified coal bed and a top-bottom plate rock stratum model in an annular shape surrounded by the surrounding baffle plates according to the test requirement in a scaled manner, wherein the gasified coal bed uses a sample collected on site, and the top-bottom plate rock stratum is manufactured by similar rock stratum fragments on a clay mixing site and is pressed to the original ground stress;
s3, drilling holes from the upper surface of the model to two sides of the coal bed, and opening a gasification channel between the drilling holes along the coal bed, and communicating the air supply holes with the air outlet holes to form an initial channel of a gasification working surface, wherein the air supply holes and the air outlet holes are respectively connected with an external gasifying agent pipe and a collecting pipe, so that air flow can be smoothly blown into the coal bed, coal gas can be discharged from the coal bed, and heat conditions necessary in the gasification process are provided;
s4, arranging thermocouples at intervals of 1/10 of the total length of the model along the length direction of the gasification channel, wherein the distance between the thermocouples in the height direction is 1/20 of the total height of the model, so that the temperature distribution along the gasification channel direction and the height direction in the gasification process can be accurately measured, and the positions of an oxidation zone, a reduction zone and a dry distillation drying zone can be known in time;
s5, arranging an igniter and a pilot in the gasification channel, igniting and igniting the gasified coal bed, continuously introducing gasifying agent from the air supply hole, and collecting coal bed gas from the air outlet hole;
s6, the electromagnet is powered off to enable the damping rod to freely move, so that the coal bed model can expand under certain resistance, the circulating pump and the heat source control the temperature of the heat dissipation plate, and the heat dissipation condition of heat in the coal bed is simulated according to the specific heat capacity of the coal bed;
s7, dynamically analyzing the collected data of the coal bed gas and the thermocouple, and obtaining a temperature field in the whole test process, the concentration of discharged gas components according to the change of a gasifying agent in the gasification process, the moving speed of a flame working face in the coal bed gasification process, and the expansion form and change along the radial direction and the channel direction by a model test, so that the change form and range of a coal bed combustion space area in the underground gasification process can be predicted, and the model test is used for predicting the underground gasification safety and improving the economic benefit.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the gear ring is rotated by the driving motor, so that the buffer connecting rod assembly can drive each enclosing baffle to synchronously move, and the size of an annular enclosed by the buffer connecting rod assembly is changed, so that the volume of the test container is changed, and the test container is suitable for tests without scale.
In the invention, when the coal bed burns, the electromagnet is powered off to enable the damping rod to freely move, so that the coal bed model can expand under certain resistance, the circulating pump and the heat source control the temperature of the heat dissipation plate, and the heat dissipation condition of heat in the coal bed is simulated according to the specific heat capacity of the coal bed.
According to the invention, the collected data of the coal bed gas and the thermocouple are dynamically analyzed, a temperature field in the whole test process is obtained through a model test, the concentration of discharged gas components according to the change of the gasifying agent in the gasification process, the moving speed of a flame working face in the coal bed gasification process and the expansion form and change along the radial direction and the channel direction can be predicted, the change form and range of a coal bed combustion space area in the underground gasification process can be predicted, and the method is used for predicting the underground gasification safety and improving the economic benefit.
Drawings
FIG. 1 is a schematic diagram of a test apparatus for simulating underground gasification of coal;
FIG. 2 is a schematic view of a projection structure of a surrounding barrier and an expansion link;
FIG. 3 is a schematic structural view of a buffer link assembly;
in the figure: 1. a base; 2. a surrounding baffle; 21. expanding the sheet; 22. a magnetic column; 23. a heat dissipation plate; 3. a guide rod; 4. a guide block; 5. a support post; 6. expanding a connecting rod; 7. a fixing ring; 8. a gear ring; 81. a drive gear; 82. a motor; 9. a buffer linkage assembly; 91. a frame; 92. a damping rod; 93. a buffer spring; 94. an electromagnet; 95. a magnetic conductive block; 96. separating the spring.
Detailed Description
Referring to fig. 1 and 2, in an embodiment of the invention, a test device for simulating underground coal gasification includes a base 1, wherein an upper surface of the base 1 is a smooth surface, a plurality of surrounding baffle plates 2 are distributed on the smooth surface in a closed circumference manner, a guide rod 3 is fixed on one surface of the outer side of the surrounding baffle plates 2, the guide rod 3 is slidably connected with a guide block 4, and the guide block 4 is fixed in the base 1, so that the surrounding baffle plates 2 are slidably arranged on the base 1;
the base 1 is peripherally fixed with a plurality of pillars 5 positioned at the center of each surrounding baffle 2, the pillars 5 are fixedly connected with a fixed ring 7 together, the fixed ring 7 is arranged outside the range of the ring shape formed by surrounding when the surrounding baffle 2 moves to the farthest position from the center, the fixed ring 7 is rotatably provided with a gear ring 8, a plurality of buffer connecting rod assemblies 9 are hinged on the gear ring 8 in a circumferentially distributed manner, and the other end of each buffer connecting rod assembly 9 is hinged to the middle of the corresponding surrounding baffle 2.
In this embodiment, a driving gear 81 meshed with the gear ring 8 is provided on one side of the gear ring 8, the driving gear 81 is rotatably connected in the fixed ring 7, a motor 82 is fixed below the fixed ring 7, and an output shaft of the motor 82 is connected to the driving gear 81;
that is, the gear ring 8 is rotated by the driving motor 82, so that the buffer link assembly 9 drives each of the surrounding baffle plates 2 to move synchronously, thereby changing the size of the ring shape formed by the surrounding baffle plates, changing the volume of the test container, and being suitable for tests without scale.
In this embodiment, a sliding pad, preferably made of polytetrafluoroethylene, is provided on the contact surface between the guide block 4 and the guide rod 3, and a self-lubricating material is generated during sliding, so that the sliding pad and the guide rod can slide stably and smoothly.
In this embodiment, the two sides of the enclosure sheet 2 are symmetrically provided with expansion sheets 21, and the expansion sheets 21 can be accommodated in the enclosure sheet 2 and slidably connected with the enclosure sheet 2.
In this embodiment, the expansion pieces 21 on both sides of each enclosure piece 2 are symmetrically connected to the corresponding support posts 5 through an expansion connecting rod 6, and two ends of the expansion connecting rod 6 are respectively hinged with the expansion pieces 21 and the support posts 5;
and when the length and the inclination angle of the expansion connecting rod 6 enable each enclosing baffle plate 2 to synchronously slide for any length along the guide rod 3, the expansion plates 21 are driven to stretch and retract, so that the adjacent expansion plates 21 are always attached.
In this embodiment, a side surface of the expansion sheet 21 far away from the enclosure sheet 2 is provided with a magnetic column 22, the magnetic column 22 is made of soft magnetic conductive material, and the magnetic columns 22 in two adjacent expansion sheets 21 have opposite magnetism.
In this embodiment, the buffer link assembly 9 includes a frame 91 and a damper rod 92, one end of the frame 91 is hinged to the gear ring 8, the damper rod 92 is fixed in the frame 91, a piston rod of the damper rod 92 is slidably connected to the frame 91, and the end of the damper rod is hinged to the enclosure plate 2;
the damping rod 92 is also sleeved with a buffer spring 93, one end of the buffer spring 93 is fixedly connected with the frame, and the other end of the buffer spring 93 is fixedly connected with a piston rod of the damping rod 92.
In this embodiment, the outer wall of the piston rod of the damping rod 92 is provided with a tooth trace, the inner wall of the frame 91 attached to the piston rod is respectively provided with an electromagnet 94 and a magnetic conducting block 95, and one surfaces of the electromagnet 94 and the magnetic conducting block 95 away from the piston rod are respectively connected with the frame 91 through a separating spring 96;
and, the said separating spring 96 makes the electromagnet 94 and magnetic conduction block 95 keep away from the piston rod in the natural state, and it attracts the magnetic conduction block 95 and clamps the piston rod when the electromagnet 94 is energized, thus can limit the activity of the damping rod 92.
In this embodiment, the inner sides of the enclosure sheet 2 and the expansion sheet 21 are heat dissipation plates 23, the heat dissipation plates 23 are made of high heat conduction materials, and heat conduction pipes are distributed on the inner walls of the heat dissipation plates, and the heat conduction pipes are connected to an external circulating pump and a heat source.
The embodiment also comprises a test method for simulating underground coal gasification:
s1, in a state that the electromagnet 94 is electrified to limit the movement of the damping rod 92, the driving motor 82 rotates the gear ring 8, and the buffer connecting rod assembly 9 can drive each surrounding baffle plate 2 to synchronously move so as to adjust the volume of a test container;
s2, paving a gasified coal bed and a top-bottom plate rock stratum model in the ring shape surrounded by the surrounding baffle plates 2 according to the test requirement in a scaled manner, wherein the gasified coal bed uses a sample collected on site, and the top-bottom plate rock stratum is manufactured by similar rock stratum fragments in a clay mixing site and is pressed to the original ground stress;
s3, drilling holes from the upper surface of the model to two sides of the coal bed, and opening a gasification channel between the drilling holes along the coal bed, and communicating the air supply holes with the air outlet holes to form an initial channel of a gasification working surface, wherein the air supply holes and the air outlet holes are respectively connected with an external gasifying agent pipe and a collecting pipe, so that air flow can be smoothly blown into the coal bed, coal gas can be discharged from the coal bed, and heat conditions necessary in the gasification process are provided;
s4, arranging thermocouples at intervals of 1/10 of the total length of the model along the length direction of the gasification channel, wherein the distance between the thermocouples in the height direction is 1/20 of the total height of the model, so that the temperature distribution along the gasification channel direction and the height direction in the gasification process can be accurately measured, and the positions of an oxidation zone, a reduction zone and a dry distillation drying zone can be known in time;
s5, arranging an igniter and a pilot in the gasification channel, igniting and igniting the gasified coal bed, continuously introducing gasifying agent from the air supply hole, and collecting coal bed gas from the air outlet hole;
s6, the electromagnet 94 is powered off to enable the damping rod 92 to freely move, so that the coal bed model can expand under certain resistance, the circulating pump and the heat source control the temperature of the heat dissipation plate 23, and the heat dissipation condition of heat in the coal bed is simulated according to the specific heat capacity of the coal bed;
s7, dynamically analyzing the collected data of the coal bed gas and the thermocouple, and obtaining a temperature field in the whole test process, the concentration of discharged gas components according to the change of a gasifying agent in the gasification process, the moving speed of a flame working face in the coal bed gasification process, and the expansion form and change along the radial direction and the channel direction by a model test, so that the change form and range of a coal bed combustion space area in the underground gasification process can be predicted, and the model test is used for predicting the underground gasification safety and improving the economic benefit.
The foregoing description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical solution of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (4)
1. The utility model provides a test device for simulating coal underground gasification, includes base (1), its characterized in that, base (1) upper surface is smooth surface, and its circumference is closely distributed with multi-disc and encloses separation blade (2) on it, enclose one side outside separation blade (2) and be fixed with guide bar (3), guide bar (3) slidably are connected with guide block (4), guide block (4) are fixed in base (1) for enclose separation blade (2) slidable setting on base (1);
the base (1) is fixedly provided with a plurality of struts (5) positioned at the center of each enclosing baffle (2) at the periphery, the struts (5) are fixedly connected with a fixed ring (7) together, the fixed ring (7) is arranged outside an annular range enclosed by the enclosing baffles (2) when the enclosing baffles are moved to the farthest positions, the fixed ring (7) is rotatably provided with a gear ring (8), a plurality of buffer connecting rod assemblies (9) are hinged on the gear ring (8) in a circumferential distribution manner, and the other end of each buffer connecting rod assembly (9) is hinged to the middle of the corresponding enclosing baffle (2);
the two sides of the enclosing sheet (2) are symmetrically provided with expansion sheets (21), and the expansion sheets (21) can be accommodated in the enclosing sheet (2) and are connected with the enclosing sheet in a sliding manner;
the expansion sheets (21) on two sides of each enclosing sheet (2) are symmetrically connected to the corresponding support column (5) through an expansion connecting rod (6), and two ends of the expansion connecting rod (6) are respectively hinged with the expansion sheets (21) and the support column (5);
moreover, when each surrounding baffle (2) slides along the guide rod (3) synchronously for any length due to the length and the inclination angle of the expansion connecting rod (6), the expansion plates (21) are driven to stretch out and draw back, so that the adjacent expansion plates (21) are always attached;
a magnetic column (22) is arranged on one side surface of each expansion sheet (21) far away from the surrounding baffle sheet (2), the magnetic column (22) is made of soft magnetic conductive materials, and the magnetism of the magnetic columns (22) in two adjacent expansion sheets (21) is opposite;
the buffer connecting rod assembly (9) comprises a frame (91) and a damping rod (92), one end of the frame (91) is hinged with the gear ring (8), the damping rod (92) is fixed in the frame (91), a piston rod of the damping rod (92) is slidably connected with the frame (91), and the tail end of the damping rod is hinged into the surrounding baffle (2);
a buffer spring (93) is sleeved on the periphery of the damping rod (92), one end of the buffer spring (93) is fixedly connected with the frame, and the other end of the buffer spring is fixedly connected with a piston rod of the damping rod (92);
the outer wall of a piston rod of the damping rod (92) is provided with insections, an electromagnet (94) and a magnetic conduction block (95) are respectively arranged in the inner wall of the frame (91) attached to the piston rod, and one surfaces of the electromagnet (94) and the magnetic conduction block (95) away from the piston rod are respectively connected with the frame (91) through a separation spring (96);
the separating spring (96) enables the electromagnet (94) and the magnetic conduction block (95) to be far away from the piston rod in a natural state, and when the electromagnet (94) is electrified, the electromagnet adsorbs the magnetic conduction block (95) to clamp the piston rod;
the inner side surfaces of the surrounding baffle plates (2) and the expansion plates (21) are heat dissipation plates (23), the heat dissipation plates (23) are made of high heat conduction materials, heat conduction pipes are distributed on the inner walls of the heat dissipation plates, and the heat conduction pipes are connected to an external circulating pump and a heat source.
2. The test device for simulating underground coal gasification according to claim 1, wherein a driving gear (81) meshed with the gear ring (8) is arranged on one side of the gear ring, the driving gear (81) is rotatably connected in the fixed ring (7), a motor (82) is also fixed below the fixed ring (7), and an output shaft of the motor (82) is connected to the driving gear (81).
3. The test device for simulating underground gasification of coal according to claim 1, wherein a sliding pad is provided in the contact surface of the guide block (4) and the guide rod (3).
4. A test method for simulating underground coal gasification, which is characterized in that the test device for simulating underground coal gasification is adopted according to any one of the claims 1-3,
s1, in a state that the electromagnet (94) is electrified to limit the movement of the damping rod (92), the driving motor (82) enables the gear ring (8) to rotate, and the buffer connecting rod assembly (9) can enable each surrounding baffle (2) to synchronously move so as to adjust the volume of the test container;
s2, paving a gasified coal bed and a top-bottom plate rock stratum model in a ring shape surrounded by the surrounding baffle plates (2) in a scaled manner according to test requirements, wherein the gasified coal bed uses samples collected on site, and the top-bottom plate rock stratum is manufactured by using similar rock stratum fragments in a clay mixing site and is pressed to the original ground stress;
s3, drilling holes from the upper surface of the model to two sides of the coal bed, and opening a gasification channel between the drilling holes along the coal bed, and communicating the air supply holes and the air outlet holes to form an initial channel of a gasification working surface, thereby forming the underground coal gas producer, wherein the air supply holes and the air outlet holes are respectively connected with an external gasifying agent pipe and a collecting pipe, so that air flow can be smoothly blown into the coal bed, coal gas can be discharged from the coal bed, and the thermal conditions necessary in the gasification process can be provided;
s4, arranging thermocouples at intervals of 1/10 of the total length of the model along the length direction of the gasification channel, wherein the distance between the thermocouples in the height direction is 1/20 of the total height of the model, so that the temperature distribution along the gasification channel direction and the height direction in the gasification process can be accurately measured, and the positions of an oxidation zone, a reduction zone and a dry distillation drying zone can be known in time;
s5, arranging an igniter and a pilot material in the gasification channel, igniting and igniting the gasification coal bed, continuously introducing a gasifying agent from the air supply hole, and collecting coal gas from the air outlet hole;
s6, the electromagnet (94) is powered off to enable the damping rod (92) to freely move, so that the coal bed model can expand under certain resistance, the circulating pump and the heat source control the temperature of the heat dissipation plate (23), and the heat dissipation condition of heat in the coal bed is simulated according to the specific heat capacity of the coal bed;
s7, dynamically analyzing the collected data of the coal gas and the thermocouple, and obtaining a temperature field in the whole test process, the concentration of discharged gas components according to the change of a gasifying agent in the gasification process, the moving speed of a flame working face in the coal seam gasification process, and the expansion form and change along the radial direction and the channel direction by a model test, so that the change form and range of a coal seam combustion space area in the underground gasification process can be predicted, and the method is used for predicting the underground gasification safety and improving the economic benefit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111477378.7A CN114086941B (en) | 2021-12-06 | 2021-12-06 | Test device and method for simulating underground coal gasification |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111477378.7A CN114086941B (en) | 2021-12-06 | 2021-12-06 | Test device and method for simulating underground coal gasification |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114086941A CN114086941A (en) | 2022-02-25 |
| CN114086941B true CN114086941B (en) | 2023-09-19 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| RU98785U1 (en) * | 2010-04-29 | 2010-10-27 | Государственное образовательное учреждение высшего профессионального образования "Якутский государственный университет имени М.К. Аммосова" | UNIT FOR MODELING THE PROCESS OF UNDERGROUND GASification OF COAL |
| CN104122289A (en) * | 2013-07-17 | 2014-10-29 | 中国矿业大学(北京) | Underground coal gasification model test bed and test method |
| CN107152267A (en) * | 2017-06-26 | 2017-09-12 | 山东科技大学 | A kind of experimental rig and method for simulating coal underground gasification in situ |
| CN112127868A (en) * | 2020-09-27 | 2020-12-25 | 中国地质大学（北京） | Test device for simulating underground coal gasification and oil shale co-production and test method thereof |
| CN113445975A (en) * | 2020-03-26 | 2021-09-28 | 中国石油天然气股份有限公司 | Device and application as well as underground coal gasification test system and method |
| CN113445973A (en) * | 2020-03-26 | 2021-09-28 | 中国石油天然气股份有限公司 | Device and application as well as system and method for evaluating coal underground gasification tightness |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU98785U1 (en) * | 2010-04-29 | 2010-10-27 | Государственное образовательное учреждение высшего профессионального образования "Якутский государственный университет имени М.К. Аммосова" | UNIT FOR MODELING THE PROCESS OF UNDERGROUND GASification OF COAL |
| CN104122289A (en) * | 2013-07-17 | 2014-10-29 | 中国矿业大学(北京) | Underground coal gasification model test bed and test method |
| CN107152267A (en) * | 2017-06-26 | 2017-09-12 | 山东科技大学 | A kind of experimental rig and method for simulating coal underground gasification in situ |
| CN113445975A (en) * | 2020-03-26 | 2021-09-28 | 中国石油天然气股份有限公司 | Device and application as well as underground coal gasification test system and method |
| CN113445973A (en) * | 2020-03-26 | 2021-09-28 | 中国石油天然气股份有限公司 | Device and application as well as system and method for evaluating coal underground gasification tightness |
| CN112127868A (en) * | 2020-09-27 | 2020-12-25 | 中国地质大学（北京） | Test device for simulating underground coal gasification and oil shale co-production and test method thereof |
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