Controllable gas supply device for simulating underground coal gasification experiment

Abstract

The invention relates to the technical field of coal underground gasification simulation, and discloses a controllable gas supply device for simulating a coal underground gasification experiment, which comprises a premixing tank, a neck bush is fixedly mounted in the premixing tank, a batching turntable is rotatably mounted in the neck bush, a driving motor is fixedly mounted at the top of the premixing tank, and a gas supply device is mounted at the bottom of the premixing tank. The driving motor drives the batching turntable to rotate through the transmission shaft, a plurality of storage cavities are formed in the outer circular surface of the batching turntable, movable blocks are slidably mounted in the storage cavities, and reset springs which abut against the movable blocks in the radial direction of the batching turntable are fixedly mounted in the storage cavities. According to the device, various gasification agents are mixed into a single-phase-state mixture through differential matching of the premixing tank, the mixture is directly guided into the gasification furnace to be subjected to a gasification test, the device has the advantages of being adjustable in matching and timely in response, the problems that the types and the matching of the gasification agents are inconvenient to adjust, and changes of experiment conditions cannot be timely responded are solved, and the experiment efficiency is greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of underground coal gasification simulation, and in particular to a controllable gas supply device for simulating underground coal gasification experiments. Background Art

[0002] Underground Coal Gasification (UCG) is a technology that converts deeply buried coal resources into combustible gases (CO, H2, CH4, etc.) in situ. It can be used for coal resources that are difficult to mine through open-pit mining or underground mining due to complex geological conditions or high mining costs. Therefore, underground coal gasification has become a new development trend. Since the practical application of UCG technology involves complex geological environments and high costs, it is of great significance to conduct laboratory-scale simulation experiments before the actual project implementation to study the physical and chemical changes in the UCG process, optimize operating parameters, and evaluate environmental impacts.

[0003] The gasifier supply device is one of the key equipment for UCG simulation experiments. It is responsible for accurately controlling the proportion and flow rate of each gas (oxygen, water vapor, etc.) in the gasifier according to the requirements of the experimental design. Currently, research on underground coal gasification experiments at home and abroad mainly focuses on process optimization and reactor design, while there are few reports on the problem of gasifier supply in the underground coal gasification process.

[0004] The existing commonly used gas supply device meets different simulation process requirements by pre-proportioning the gasifying agent and changes the feed amount to realize gasification tests under different working conditions. However, this adjustment method is relatively rough and not flexible enough. It is impossible to adjust the type and proportion of the gasifying agent to respond to changes in experimental conditions in a timely manner, which affects the experimental efficiency. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings of existing gas supply devices that meet different simulation process requirements by pre-proportioning gasifying agents, and cannot adjust the type and proportion of gasifying agents to respond to changes in experimental conditions in a timely manner. A controllable gas supply device for simulating underground coal gasification experiments is proposed.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a controllable gas supply device for simulating underground coal gasification experiment, including a premixing tank, an inner liner is fixedly installed inside the premixing tank, a batching turntable is rotatably installed inside the inner liner, and a drive motor is fixedly installed on the top of the premixing tank, and the drive motor drives the batching turntable to rotate through a transmission shaft.

[0007] The outer circumferential surface of the batching turntable is provided with a plurality of storage cavities, each storage cavity is slidably installed with a movable block, and a return spring is fixedly installed in the storage cavity to press the movable block along the radial direction of the batching turntable. The inside of the batching turntable is provided with a plurality of airway holes, and the upper end of each airway hole is respectively connected to each storage cavity, and the bottom end of each airway hole extends to the bottom of the batching turntable.

[0008] A plurality of gas guide joints are fixedly mounted on the surface of the premixing tank, and the ports of the gas guide joints extend to the inner wall of the inner liner. When the batching turntable rotates, each storage cavity can be connected to each gas guide joint. Various types of gasifying agents are mixed into a single-phase mixture through differentiated proportions in the premixing tank and directly introduced into the gasifier for gasification testing. The mixture has the characteristics of adjustable proportions and timely response.

[0009] Preferably, a plurality of electromagnetic coils are embedded inside the inner sleeve and arranged in a circular array, a permanent magnet block is embedded in each movable block, and the side of the movable block away from the reset spring is an arc surface structure, and the arc surface of the movable block is in sliding contact with the inner wall of the inner sleeve. When the electromagnetic coil is energized, magnetic attraction and repulsion forces that interact with the movable block are generated, which can drive the movable block to move in the storage chamber and adjust the volume of the storage chamber.

[0010] Preferably, the number of the storage chamber, airway holes, gas guide joints and electromagnetic coils is five, the five gas guide joints include four input joints and one output joint, the controllable gas supply device for simulating underground coal gasification experiment also includes an oxygen cylinder, a nitrogen cylinder, a compressed air cylinder, a water vapor cylinder and a pressure-stabilizing valve, the upper ends of the oxygen cylinder, the nitrogen cylinder, the compressed air cylinder and the water vapor cylinder are fixedly installed with bottle head pressure reducing valves, the four bottle head pressure reducing valves are respectively connected to the four input joints in the gas guide joint through pipelines, the outlet end of the output joint in the gas guide joint is connected to the pressure-stabilizing valve, the output pressure of each gasifying agent is controlled by the bottle head pressure reducing valve, the premixing tank has the functions of low-pressure proportioning and mixing, so as to achieve the effect of reducing the proportioning error.

[0011] Preferably, a discharge pipe is fixedly installed at the bottom of the premixing tank, the top end of the discharge pipe is rotatably connected to the bottom end of the batching turntable, and the bottom ends of the five airway holes are connected to the discharge pipe. A boosting pipe is fixedly installed in the discharge pipe. During the rotation of the batching turntable, the bottom ends of the five airway holes are sequentially connected to the upper port of the boosting pipe. The boosting pipe is used to input pressurized medium into the storage chamber, and the movable block is pushed to compress the mixed gasifying agent in the storage chamber, which has the function of pressurizing the mixed gasifying agent.

[0012] Preferably, the interior of the premixing tank includes an upper chamber and a lower chamber, the upper chamber is located on the upper side of the batching turntable, and the lower chamber is located on the lower side of the batching turntable. A liquid infusion pipe and an exhaust pipe are fixedly installed on the top of the premixing tank, and both the liquid infusion pipe and the exhaust pipe are connected to the upper chamber.

[0013] A heat preservation chamber is arranged in the shell of the premixing tank, a connecting hole is opened on the inner wall of the premixing tank, the upper chamber is connected with the heat preservation chamber through the connecting hole, a temperature control output pipe and a temperature control input pipe are fixedly installed on the bottom of the premixing tank, the temperature control input pipe is connected with the heat preservation chamber, the temperature control output pipe is connected with the lower chamber, circulating water of different temperatures is injected into the upper chamber, the lower chamber and the heat preservation chamber, which has the function of adjusting the temperature of the premixing tank and the function of water sealing the upper and lower sides of the batching turntable.

[0014] Preferably, the upper surface of the batching turntable is provided with a plurality of heat-conducting channels running through the upper and lower chambers, the upper chamber and the lower chamber are connected through the heat-conducting channels, a cover plate is slidably mounted on the upper end of the batching turntable, a plurality of shut-off plugs are fixedly mounted on the lower surface of the cover plate, the shut-off plugs can be slidably inserted into the upper openings of the heat-conducting channels, and the opening size of the shut-off plugs can control the flow rate of the heat-conducting channels, thereby controlling the heating and cooling speeds of the premixing tank.

[0015] The present invention has the following beneficial effects:

[0016] 1. The controllable gas supply device for simulating underground coal gasification experiment proposed in the present invention uses differentiated proportions of various types of gasifying agents in a premixing tank to mix them into a single-phase mixture, which is directly introduced into the gasifier for gasification experiment. It has the characteristics of adjustable proportions and timely response, which solves the problems of inconvenient adjustment of the types and proportions of gasifying agents and inability to respond to changes in experimental conditions in a timely manner, and greatly improves the experimental efficiency.

[0017] 2. The premixing tank proposed by the present invention has a storage chamber arranged inside thereof which moves in a circle with the batching turntable. The electromagnetic coil and the return spring provide a set of relative forces for the movable block, so that the movable block moves in the storage chamber. Since the force of the electromagnetic coil on the movable block is adjustable, the volume of the storage chamber can be changed, so that various types of gasifying agents are introduced into the storage chamber according to a preset volume ratio, so as to achieve the effect that the types and proportions of the gasifying agents are adjustable and controllable;

[0018] During the rotation of the batching turntable, the mixed gasifying agent in each storage chamber is discharged into the gasifier in turn through the output joint in the gas guide joint. By adjusting the rotation speed of the batching turntable, the output flow rate of the mixed gasifying agent can be adjusted to realize the gasification test under different working conditions. This design has the advantage of timely response.

[0019] 3. The premixing tank proposed in the present invention has the functions of low-pressure proportioning and mixing. Since the proportion of water vapor in the gasifying agent needs to be controlled, the content of gaseous water in the air will decrease with the increase of pressure. Because at the same temperature, the saturated vapor pressure of water is basically fixed, when the total pressure increases, the original saturated water will condense with the increase of partial pressure, resulting in a decrease in the content of gaseous water. The condensed water vapor is retained in the pipeline, which will affect the accuracy of the gasifying agent proportion. This design expands the proportion range of water vapor, meets different experimental needs, and improves the accuracy of the gasifying agent proportion.

[0020] 4. The premixing tank proposed in the present invention is provided with an upper chamber, a lower chamber and a heat preservation chamber which are interconnected. Circulating water of different temperatures is injected into the premixing tank, which has the function of adjusting the temperature of the premixing tank to meet the requirements of batching at different temperatures. At the same time, after the upper chamber and the lower chamber are filled with water, they have the function of water sealing the upper and lower sides of the batching turntable. Because the water pressure is greater than the internal pressure of the gasifying agent with low-pressure proportioning, the overflow of the gasifying agent can be prevented. In addition, by providing a boosting pipe, a pressurized medium is input into the storage chamber by the boosting pipe, and the movable block is pushed to compress the mixed gasifying agent in the storage chamber. It has the function of pressurizing the mixed gasifying agent to meet different experimental requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the three-dimensional structure of the premixing tank proposed by the present invention;

[0022] Figure 2 This is a three-dimensional schematic diagram of the internal structure of the premixing tank proposed by the present invention (I);

[0023] Figure 3 This is a three-dimensional schematic diagram of the internal structure of the premixing tank proposed by the present invention (II);

[0024] Figure 4 This is a schematic diagram of the front cross-section structure of the premixing tank proposed by the present invention;

[0025] Figure 5 This is a schematic diagram of the top-down structure of the premixing tank proposed by the present invention (I);

[0026] Figure 6 This is a schematic diagram of the top-down structure of the premixing tank proposed by the present invention (II);

[0027] Figure 7 This is a schematic diagram of the gas supply of the premixing tank proposed in the present invention.

[0028] In the figure: 1 premixing tank, 2 inner liner, 3 batching turntable, 4 driving motor, 5 storage chamber, 6 movable block, 7 return spring, 8 airway hole, 9 air guide joint, 10 electromagnetic coil, 11 discharge pipe, 12 booster pipe, 13 upper chamber, 14 lower chamber, 15 liquid replenishing pipe, 16 exhaust pipe, 17 temperature control output pipe, 18 temperature control input pipe, 19 insulation chamber, 20 connecting hole, 21 heat conduction channel, 22 cover plate, 23 shutoff plug, 24 electromagnetic sleeve, 25 magnetic protrusion, 26 hexagonal column, 27 oxygen cylinder, 28 nitrogen cylinder, 29 compressed air cylinder, 30 water vapor cylinder, 31 pressure regulating valve, 32 gasifier. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0030] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0031] Reference Figure 1-7 A controllable gas supply device for simulating underground coal gasification experiment includes a premixing tank 1, an inner liner 2 is fixedly installed inside the premixing tank 1, a batching turntable 3 is rotatably installed inside the inner liner 2, and a driving motor 4 is fixedly installed on the top of the premixing tank 1, and the driving motor 4 drives the batching turntable 3 to rotate through a transmission shaft.

[0032] A plurality of storage cavities 5 are provided on the outer circumferential surface of the batching turntable 3, and a movable block 6 is slidably installed in each storage cavity 5. A return spring 7 is fixedly installed in the storage cavity 5 to press the movable block 6 along the radial direction of the batching turntable 3. A plurality of airway holes 8 are provided inside the batching turntable 3, and the upper end of each airway hole 8 is connected to each storage cavity 5 respectively, and the bottom end of each airway hole 8 extends to the bottom of the batching turntable 3.

[0033] A plurality of air guide joints 9 are fixedly mounted on the surface of the premixing tank 1 , and ports of the air guide joints 9 extend to the inner wall of the inner liner 2 . When the batching turntable 3 rotates, each storage cavity 5 can be connected to each air guide joint 9 .

[0034] refer to Figure 5 A plurality of electromagnetic coils 10 are embedded inside the inner sleeve 2, and the plurality of electromagnetic coils 10 are arranged in a circular array. A permanent magnet block is embedded in each movable block 6. The side of the movable block 6 away from the reset spring 7 is an arc surface structure. Under the action of the reset spring 7, the arc surface of the movable block 6 slides in contact with the inner wall of the inner sleeve 2. When each electromagnetic coil 10 is energized, a magnetic repulsion and a magnetic attraction force interacting with each movable block 6 are generated. The magnetic repulsion force is greater than the action force of the reset spring 7, which will push the movable block 6 to move and compress the reset spring 7.

[0035] In this embodiment, the number of the storage chamber 5, the airway hole 8, the air guide connector 9 and the electromagnetic coil 10 are all five, and the five air guide connectors 9 include four input connectors and one output connector.

[0036] refer to Figure 7The controllable gas supply device for simulating underground coal gasification experiment also includes an oxygen cylinder 27, a nitrogen cylinder 28, a compressed air cylinder 29, a water vapor cylinder 30 and a pressure-stabilizing valve 31. The upper ends of the oxygen cylinder 27, the nitrogen cylinder 28, the compressed air cylinder 29 and the water vapor cylinder 30 are fixedly installed with bottle head pressure reducing valves. The four bottle head pressure reducing valves are respectively connected to the four input joints in the gas guide joint 9 through pipelines, the outlet end of the output joint in the gas guide joint 9 is connected to the pressure-stabilizing valve 31, and the outlet end of the pressure-stabilizing valve 31 is connected to the gasifier 32 through a pipeline.

[0037] A discharge pipe 11 is fixedly installed at the bottom of the premixing tank 1, and the top end of the discharge pipe 11 is rotatably connected to the bottom end of the batching turntable 3, and the bottom ends of the five airway holes 8 are connected to the discharge pipe 11. A booster pipe 12 is fixedly installed in the discharge pipe 11. During the rotation of the batching turntable 3, the bottom ends of the five airway holes 8 are sequentially connected to the upper end of the booster pipe 12. Figure 2 , Figure 3 , Figure 4 .

[0038] like Figure 5 As shown, the five storage chambers 5 are arranged in a circular array. When the batching turntable 3 rotates clockwise to Figure 5 At the angle shown, the five gas guide joints 9 are connected to the five storage chambers 5; adjust the output pressure of the oxygen cylinder 27, the nitrogen cylinder 28, the compressed air cylinder 29 and the water vapor cylinder 30 (eg 0.2MPa);

[0039] See Figure 6 At this time, four electromagnetic coils 10 (electromagnetic coils 10 corresponding to the four input connectors) exert different magnetic repulsion forces on the movable block 6, so that the movable block 6 moves and compresses the return spring 7, forming a negative pressure in the storage chamber 5, and each gasifying agent (water vapor, oxygen, nitrogen and air) enters the storage chamber 5 from the input connectors at different positions. Figure 6 As shown in the figure, the volumes of the four storage chambers 5 are V1, V2, V3, and V4, respectively, wherein V1 is equal to the volume of water vapor, V2 is equal to the volume sum of water vapor and oxygen, V3 is equal to the volume sum of water vapor, oxygen, and nitrogen, and V4 is equal to the volume sum of water vapor, oxygen, nitrogen, and air. The volume ratio of water vapor, oxygen, nitrogen, and air is V1: (V2-V1): (V3-V2-V1): (V4-V3-V2-V1). When the storage chamber 5 is rotated clockwise to Figure 6 When in the rightmost position shown, another electromagnetic coil 10 (the electromagnetic coil 10 corresponding to the output connector) generates a magnetic attraction force to attract the movable block 6, and the movable block 6 moves and compresses the mixed gas of water vapor, oxygen, nitrogen and air, so that the mixed gas is introduced into the gasifier 32 through the output connector;

[0040] It should be noted that the sizes of V1, V2, V3, and V4 are determined by the sizes of the magnetic repulsion of the above-mentioned four electromagnetic coils 10. By changing the current sizes of the four electromagnetic coils 10, the volume ratios of water vapor, oxygen, nitrogen, and air can be adjusted. For example, when the currents of the four electromagnetic coils 10 are zero, V1, V2, V3, and V4 are all zero, indicating that there is no input or output of the gasifying agent. Since the batching turntable 3 is in a rotating state, the movable blocks 6 are in a state of dynamic equilibrium, the masses of the movable blocks 6 are the same, the speed of the batching turntable 3 is constant, and the centrifugal forces of the movable blocks 6 are also the same. When the speed of the batching turntable 3 changes, the centrifugal forces of the movable blocks 6 change accordingly. The magnetic repulsion of the electromagnetic coils 10 can be increased to offset the changes in the centrifugal forces of the movable blocks 6, which can be ignored here.

[0041] The premixing tank 1 proposed by the present invention has a storage chamber 5 arranged therein which moves in a circle with the batching turntable 3. The electromagnetic coil 10 and the return spring 7 provide a set of relative forces for the movable block 6, so that the movable block 6 moves in the storage chamber 5. Since the force of the electromagnetic coil 10 on the movable block 6 is adjustable, the volume of the storage chamber 5 (here, it refers to the volume on the side of the movable block 6 away from the return spring 7) can be changed, so that various types of gasifying agents are introduced into the storage chamber 5 according to a preset volume ratio. By changing the current of the four electromagnetic coils 10, the volume ratio of water vapor, oxygen, nitrogen and air can be adjusted, so as to achieve the effect that the types and proportions of the gasifying agents can be adjusted and controlled.

[0042] During the rotation of the batching turntable 3, the mixed gasifying agent in each storage chamber 5 is discharged into the gasifier 32 in sequence through the output joint in the gas guide joint 9. By adjusting the rotation speed of the batching turntable 3, the output flow rate of the mixed gasifying agent can be adjusted to realize the gasification test under different working conditions. This design has the advantage of timely response.

[0043] The premixing tank 1 proposed in the present invention has the functions of low-pressure proportioning and mixing. Since the proportion of water vapor in the gasifying agent needs to be controlled, the content of gaseous water in the air will decrease with the increase of pressure. Because at the same temperature, the saturated vapor pressure of water is basically fixed, when the total pressure increases, the original saturated water will condense with the increase of partial pressure, resulting in a decrease in the content of gaseous water. The condensed water vapor is retained in the pipeline, which will affect the accuracy of the gasifying agent proportioning. This design expands the proportioning range of water vapor, meets different experimental requirements, and improves the accuracy of the gasifying agent proportioning.

[0044] In this embodiment, the interior of the premixing tank 1 includes an upper chamber 13 and a lower chamber 14. The upper chamber 13 is located on the upper side of the dosing turntable 3, and the lower chamber 14 is located on the lower side of the dosing turntable 3. A liquid infusion pipe 15 and an exhaust pipe 16 are fixedly installed on the top of the premixing tank 1, and the liquid infusion pipe 15 and the exhaust pipe 16 are both connected to the upper chamber 13.

[0045] A heat preservation chamber 19 is provided in the outer shell of the premixing tank 1, and a connecting hole 20 is opened on the inner wall of the premixing tank 1. The upper chamber 13 is connected with the heat preservation chamber 19 through the connecting hole 20. A temperature control output pipe 17 and a temperature control input pipe 18 are fixedly installed at the bottom of the premixing tank 1, respectively. The temperature control input pipe 18 is connected with the heat preservation chamber 19, and the temperature control output pipe 17 is connected with the lower chamber 14.

[0046] The upper surface of the batching turntable 3 is provided with a plurality of heat-conducting channels 21 penetrating from top to bottom. The upper chamber 13 and the lower chamber 14 are connected through the heat-conducting channels 21. A cover plate 22 is slidably mounted on the upper end of the batching turntable 3. A plurality of shut-off plugs 23 are fixedly mounted on the lower surface of the cover plate 22. The shut-off plugs 23 can be slidably inserted into the upper opening of the heat-conducting channels 21.

[0047] An electromagnetic sleeve 24 is fixedly installed on the inner top wall of the premixing tank 1, and a magnetic protrusion 25 is provided on the surface of the cover plate 22. The magnetic protrusion 25 of the cover plate 22 is rotatably arranged in the electromagnetic sleeve 24. A hexagonal column 26 is fixedly installed on the upper end of the batching turntable 3. The magnetic protrusion 25 of the cover plate 22 is slidably sleeved on the surface of the hexagonal column 26, and the cover plate 22 rotates with the batching turntable 3.

[0048] During use, the temperature control input pipe 18 injects water into the insulation chamber 19, and the water flows into the upper chamber 13 through the connecting hole 20. When the electromagnetic sleeve 24 is energized, a force is generated to attract the magnetic protrusion 25 upward, causing the cover plate 22 to float a certain distance, and a gap is generated between the shut-off plug 23 and the upper opening of the heat conduction channel 21. The water in the upper chamber 13 enters the heat conduction channel 21 through the gap, then flows into the lower chamber 14, and is finally discharged from the temperature control output pipe 17.

[0049] The premixing tank 1 proposed in the present invention is provided with an upper chamber 13, a lower chamber 14 and a heat preservation chamber 19 which are interconnected. Circulating water of different temperatures is injected into the premixing tank 1, which has the function of adjusting the temperature of the premixing tank 1 to meet the requirements of batching at different temperatures. At the same time, after the upper chamber 13 and the lower chamber 14 are filled with water, the upper and lower sides of the batching turntable 3 are water-sealed, because the water pressure is greater than the internal pressure of the gasifying agent of the low-pressure proportioning, which can prevent the overflow of the gasifying agent.

[0050] In addition, by setting up a booster pipe 12, a pressurized medium is input into the storage chamber 5 by using the booster pipe 12, and the movable block 6 is pushed to compress the mixed gasifying agent in the storage chamber 5, so that the mixed gasifying agent maintains a certain pressure and is introduced into the gasification furnace 32. It has the function of pressurizing the mixed gasifying agent to meet different experimental needs.

[0051] The controllable gas supply device for simulating underground coal gasification experiment proposed by the present invention uses differentiated ratios of various types of gasifying agents in a premixing tank 1 to mix them into a single-phase mixture, which is directly introduced into a gasifier 32 for gasification experiment. The gas supply is achieved by continuously outputting a number of unit volumes of mixed gasifying agents, reducing the effects of temperature and pressure on the gasifying agents, and has the characteristics of adjustable ratio and timely response, which solves the problems of inconvenient adjustment of the types and ratios of gasifying agents and inability to respond to changes in experimental conditions in a timely manner, greatly improves the experimental efficiency, and can be applied to various types of simulated underground coalbed gasification experimental devices, with broad application prospects.

[0052] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A controllable gas supply device for simulating underground coal gasification experiment, comprising a premixing tank (1), characterized in that: An inner liner (2) is fixedly installed inside the premixing tank (1), a batching turntable (3) is rotatably installed inside the inner liner (2), a driving motor (4) is fixedly installed on the top of the premixing tank (1), and the driving motor (4) drives the batching turntable (3) to rotate via a transmission shaft; The outer circumferential surface of the batching turntable (3) is provided with a plurality of storage cavities (5), each storage cavity (5) is slidably provided with a movable block (6), a return spring (7) is fixedly provided in the storage cavity (5) and presses against the movable block (6) in the radial direction of the batching turntable (3), and a plurality of air passage holes (8) are provided inside the batching turntable (3), the upper end of each air passage hole (8) is respectively connected to each storage cavity (5), and the bottom end of each air passage hole (8) extends to the bottom of the batching turntable (3); A plurality of air guide joints (9) are fixedly mounted on the surface of the premixing tank (1), and ports of the air guide joints (9) extend to the inner wall of the inner liner (2). When the batching turntable (3) rotates, each storage cavity (5) can be connected to each air guide joint (9).

2. The controllable gas supply device for simulating underground coal gasification experiment according to claim 1, characterized in that: A plurality of electromagnetic coils (10) are embedded inside the inner sleeve (2), and the plurality of electromagnetic coils (10) are arranged in a circular array. A permanent magnet block is embedded in each movable block (6), and a side of the movable block (6) away from the return spring (7) is an arc surface structure, and the arc surface of the movable block (6) is in sliding contact with the inner wall of the inner sleeve (2).

3. The controllable gas supply device for simulating underground coal gasification experiment according to claim 2, characterized in that: The number of the storage chamber (5), the airway hole (8), the air guide joints (9) and the electromagnetic coil (10) is five, and the five air guide joints (9) include four input joints and one output joint.

4. The controllable gas supply device for simulating underground coal gasification experiment according to claim 3 is characterized by: A discharge pipe (11) is fixedly installed at the bottom of the premixing tank (1), the top end of the discharge pipe (11) is rotatably connected to the bottom end of the batching turntable (3), and the bottom ends of the five airway holes (8) are connected to the discharge pipe (11). A booster pipe (12) is fixedly installed in the discharge pipe (11), and during the rotation of the batching turntable (3), the bottom ends of the five airway holes (8) are sequentially connected to the upper end of the booster pipe (12).

5. The controllable gas supply device for simulating underground coal gasification experiment according to claim 4, characterized in that: The interior of the premixing tank (1) comprises an upper chamber (13) and a lower chamber (14), the upper chamber (13) being located on the upper side of the batching turntable (3), and the lower chamber (14) being located on the lower side of the batching turntable (3), and a liquid infusion pipe (15) and an exhaust pipe (16) being fixedly mounted on the top of the premixing tank (1), respectively, and the liquid infusion pipe (15) and the exhaust pipe (16) are both in communication with the upper chamber (13).

6. The controllable gas supply device for simulating underground coal gasification experiment according to claim 5, characterized in that: A heat preservation chamber (19) is provided in the shell of the premixing tank (1), a communication hole (20) is provided on the inner wall of the premixing tank (1), the upper chamber (13) is connected to the heat preservation chamber (19) through the communication hole (20), and a temperature control output pipe (17) and a temperature control input pipe (18) are fixedly installed at the bottom of the premixing tank (1), the temperature control input pipe (18) is connected to the heat preservation chamber (19), and the temperature control output pipe (17) is connected to the lower chamber (14).

7. The controllable gas supply device for simulating underground coal gasification experiment according to claim 6, characterized in that: The upper surface of the batching turntable (3) is provided with a plurality of heat-conducting channels (21) penetrating upward and downward, the upper chamber (13) and the lower chamber (14) are connected via the heat-conducting channels (21), a cover plate (22) is slidably mounted on the upper end of the batching turntable (3), a plurality of shut-off plugs (23) are fixedly mounted on the lower surface of the cover plate (22), and the shut-off plugs (23) can be slidably inserted into the upper openings of the heat-conducting channels (21).

8. The controllable gas supply device for simulating underground coal gasification experiment according to claim 7, characterized in that: An electromagnetic sleeve (24) is fixedly mounted on the inner top wall of the premixing tank (1), a magnetic protrusion (25) is arranged on the surface of the cover plate (22), and the magnetic protrusion (25) of the cover plate (22) is rotatably arranged in the electromagnetic sleeve (24), and a hexagonal column (26) is fixedly mounted on the upper end of the batching turntable (3), and the magnetic protrusion (25) of the cover plate (22) is slidably sleeved on the surface of the hexagonal column (26).

9. The controllable gas supply device for simulating underground coal gasification experiment according to claim 8, characterized in that: The controllable gas supply device for simulating underground coal gasification experiment further comprises an oxygen cylinder (27), a nitrogen cylinder (28), a compressed air cylinder (29), a water vapor cylinder (30) and a pressure stabilizing valve (31). The upper ends of the oxygen cylinder (27), the nitrogen cylinder (28), the compressed air cylinder (29) and the water vapor cylinder (30) are all fixedly mounted with a bottle head pressure reducing valve. The four bottle head pressure reducing valves are respectively connected to four input joints in the gas guide joint (9) through pipelines, and the outlet end of the output joint in the gas guide joint (9) is connected to the pressure stabilizing valve (31).

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