Coal underground gasification simulation experiment equipment and method

Abstract

The invention discloses coal underground gasification simulation experiment equipment and method.The equipment comprises a screening mechanism, the screening mechanism comprises a screening shell and screening assemblies, a plurality of sliding grooves are obliquely formed in the screening shell in the vertical direction, and the screening assemblies are slidably arranged in the sliding grooves; a feeding port is formed in the top of the screening shell, a first material guiding plate is obliquely and fixedly arranged at the feeding port, a plurality of material conveying plates are obliquely and fixedly arranged in the screening shell in the vertical direction, the screening assembly comprises two arc-shaped screening bases, a first screening net, a second screening net and a material pushing assembly, and the screening bases are arranged in the screening shell. Supporting plates are fixedly arranged on the screening bases in an inclined mode, a first screening net is fixedly arranged between the two supporting plates, an arc-shaped second screening net and an arc-shaped check ring are fixedly arranged between the two screening bases, two openings are formed between the arc-shaped check ring and the second screening net, and the material pushing assembly is rotationally arranged on the screening bases.

Description

Technical Field

[0001] The present invention relates to the technical field of underground coal gasification simulation experiments, in particular to underground coal gasification simulation experiment equipment and method. Background Art

[0002] The main purpose of the underground coal gasification simulation experiment is to study the process and mechanism of coal gasification reaction underground by simulating the actual conditions of underground coal seams, and then optimize the gasification process parameters, improve the gasification efficiency and product quality, and provide theoretical basis and technical support for the industrial application of underground coal gasification technology.

[0003] In coal gasification experiments, it is usually necessary to screen the coal samples before inputting them into the gasifier for gasification reaction. It is necessary to ensure that the coal particles in the gasifier are uniform in size, and it is also necessary to replace coal of different sizes during the experiment to explore the effect of coal particle size on coal gasification efficiency. Existing screening usually uses a screening net to screen the coal. Usually, a screening net is set on the top of the gasifier, and the coal is screened through the screening net and then transported to the gasifier. When it is necessary to replace coal of different sizes, the screen needs to be replaced to screen the coal, which is more troublesome. When the screen is damaged, it is inconvenient to disassemble and replace the screen, which greatly reduces the screening efficiency of the coal, thereby affecting the coal gasification experiment.

[0004] Therefore, it is necessary to provide an underground coal gasification simulation experimental device and method to solve the problems raised in the above background technology. Summary of the Invention

[0005] To achieve the above-mentioned object, the present invention provides the following technical solution: an underground coal gasification simulation experimental device, comprising a screening mechanism, a gasifier, and a gas supply mechanism, wherein the screening mechanism is fixedly arranged at the inlet of the gasifier, and the gas supply mechanism is used to supply air, oxygen, and water vapor into the gasifier;

[0006] The screening mechanism includes a screening shell and a screening assembly, wherein the screening shell is provided with a plurality of chutes inclined vertically, the screening assembly is slidably arranged in the chutes, a feed port is provided at the top of the screening shell, a first material guide plate is fixedly arranged obliquely at the feed port, and a plurality of material conveying plates are fixedly arranged vertically obliquely in the screening shell;

[0007] The screening assembly includes a screening seat, a screening mesh 1, a screening mesh 2 and a pushing assembly, wherein the screening seat is arc-shaped and is configured with two, a support plate is fixedly arranged on the screening seat at an angle, a screening mesh 1 is fixedly arranged between the two support plates, an arc-shaped screening mesh 2 and an arc-shaped retaining ring are fixedly arranged between the two screening seats, two openings are formed between the arc-shaped retaining ring and the screening mesh 2, and the pushing assembly is rotatably arranged on the screening seat.

[0008] Preferably, the pushing assembly includes a drive shaft and a push plate, wherein the drive shaft is rotatably arranged on the screening seat, and a plurality of push plates are fixedly arranged in a circle on the drive shaft, and the push plates rotate along the screening mesh 2 and the inner side of the arc-shaped retaining ring, and a cache cavity can be formed between two adjacent push plates and the screening mesh 2.

[0009] Preferably, a slot is provided on the screening seat;

[0010] A plurality of clamping plates are slidably provided on the screening shell, an operating rod is fixedly provided on the clamping plates, and the clamping plates can be clamped into the clamping slots.

[0011] Preferably, a second guide plate is fixedly arranged on the conveying plate at an angle, a conveying cavity is fixedly arranged on the side of the screening shell, a plurality of through-holes are fixedly opened on the screening shell, the conveying plate passes through the through-holes and extends into the conveying cavity, a baffle mechanism is rotatably arranged on one end of the conveying plate close to the through-holes, a discharge port is opened below the conveying cavity, and the discharge port is connected to the inlet of the gasifier.

[0012] Preferably, the baffle mechanism includes a rotating seat and a partition, wherein the rotating seats are configured in two, the two rotating seats are rotatably arranged on the screening shell, and a partition is fixedly arranged between the two rotating seats;

[0013] An arc-shaped block is fixedly provided on the swivel seat, and an arc-shaped hydraulic rod is fixedly provided on the arc-shaped block;

[0014] The screening shell is provided with an arc-shaped rotating groove, in which an arc-shaped hydraulic cavity is provided. The arc-shaped hydraulic cavity is connected to an external hydraulic cavity driving mechanism, and the arc-shaped hydraulic rod slides sealingly along the arc-shaped hydraulic cavity.

[0015] Preferably, a deflection plate 1 is rotatably provided between the two screening seats, and the rotation end of the deflection plate 1 coincides with one end of the screening net 2, a deflection plate 2 is rotatably provided between the two support plates, an arc-shaped plate is fixedly provided between the two support plates, and the output end of the deflection plate 1 is rotatably fitted with the inner wall of the arc-shaped plate;

[0016] There is a gap between the first screening mesh and the second screening mesh, and the first deflection plate and the second deflection plate can cover the gap.

[0017] Preferably, a first guide rod is fixedly provided on the first deflection plate, and a second guide rod is fixedly provided on the second deflection plate;

[0018] The screening housing is provided with an arc-shaped guide groove 1 and a guide groove 2, wherein the guide rod 1 slides along the guide groove 1, and the guide rod 2 slides along the guide groove 2. A driving assembly is slidably provided in the screening housing.

[0019] Preferably, the driving assembly includes a driving plate and a driving rod, wherein the driving plates are provided with two, both of which are slidably arranged on the screening housing, a straight groove is provided on the driving plate, the guide rod 1 and the guide rod 2 are slidably arranged along the two straight grooves respectively, the driving rod is slidably arranged on the screening housing and a spring is provided between the driving rod and the screening housing, and the driving rod is hinged to the two driving plates via a hinged rod;

[0020] A circular plate is fixedly provided at one end of the driving shaft and the push plate, and the circular plate protrudes from the screening seat. A plurality of support rods are fixedly provided in a circle on the circular plate, and the support rods can push the driving rod to slide, and there is an angular deviation between the support rods and the push plate.

[0021] Preferably, it also includes a gasification reaction mechanism, a monitoring system and a gas analysis and processing system, wherein the gasification reaction mechanism uses a catalyst to promote the gasification reaction and improve the gas quality, the monitoring system includes a gas flow meter for measuring the amount of gas supplied by the gas supply mechanism into the gasifier, a gas temperature and pressure sensor for monitoring the temperature and pressure changes in the gasifier and the gasification reaction mechanism, a displacement sensor for monitoring the movement of the coal seam in the gasifier, and a thermocouple for measuring the temperature field changes in the gasifier and the gasification reaction mechanism, the gas analysis and processing system uses a gas chromatograph to analyze the gas components generated in the gasifier and uses an online infrared analyzer to monitor the changes in the gas components in the gasifier in real time.

[0022] A method for simulating underground coal gasification experiment, comprising the following steps:

[0023] S1, transporting the coal from the feed port to the screening mechanism for step-by-step screening;

[0024] S1.1. Coal falls onto the topmost screen mesh 1 for primary screening. The screened large coal pieces slide along screen mesh 1 into screen mesh 2 for secondary screening. The screened small coal pieces are then conveyed by the second guide plate to the next screen mesh 1 for the next screening.

[0025] S1.2. When the initially screened coal lumps enter the second screening mesh, the drive shaft is driven to rotate, causing the push plate to rotate. When the push plate rotates, the coal lumps located on the first and second deflection plates fall between the two adjacent push plates and roll along the inner side of the second screening mesh as the push plates rotate, further screening the small coal lumps mixed in the large coal lumps.

[0026] S1.3. When the drive shaft rotates, the circular plate drives the support rod to rotate together. At the same time, the rotation of the support rod pushes the drive rod to slide, and the hinge rod pushes the two drive plates to slide. The sliding of the two drive plates drives the guide rods 1 and 2 to slide along the guide grooves 1 and 2, causing the deflection plates 1 and 2 to rotate.

[0027] S1.4. The first deflector plate rotates to allow excess coal between two adjacent push plates to slide into the space formed by the first deflector plate and the curved plate. The second deflector plate rotates to block the coal on the first screen, allowing the coal between the two adjacent push plates to smoothly transfer into the second screen.

[0028] S2. The secondary screened coal blocks are blocked by the baffle mechanism and temporarily stored on the feed plate, and coal blocks of different sizes are fed into the gasifier according to experimental requirements;

[0029] S3. After the coal blocks enter the gasifier, the gasifying agent is injected into the gasifier by the gas supply mechanism to perform a gasification reaction. During the reaction, the temperature, pressure, flow rate and other data are monitored in real time by the monitoring system.

[0030] S4. Record the composition and calorific value of the gasification products in the gasifier, collect the gasification products and perform testing and analysis using a gas analysis and processing system. Through the collection and analysis of experimental data, evaluate the gasification efficiency, product quality, and optimization effect of the gasification process parameters.

[0031] Compared with the existing technology, the present invention provides an underground coal gasification simulation experimental device and method, which has the following beneficial effects:

[0032] In the present invention, the screening mechanism can be used to screen the coal step by step, and the coal of different sizes after screening can be temporarily stored on multiple feeding plates by using a baffle mechanism. When it is necessary to transport coal of different sizes to the gasifier, there is no need to replace the screening mesh, and it can be achieved by simply opening the baffle mechanism at the corresponding position. The screening assembly is provided with a screening mesh 1, a screening mesh 2 and a pushing assembly. Through the cooperation of the three, the coal can be screened twice, and the coal can be completely screened, ensuring that the size of the coal after screening is uniform, thereby effectively improving the accuracy of the coal gasification experimental data. The screening assembly is slidingly arranged on the screening shell as a whole. When the screening assembly is damaged, the screening assembly It can be directly slid and removed from the screening shell, which makes it easy to replace and repair the screening component. The replacement process is convenient and quick, effectively reducing the impact on the coal screening work, and thus reducing the impact on the coal gasification experiment. At the same time, deflection plate 1 and deflection plate 2 are set on the screening component. When the pushing assembly rotates, deflection plate 1 and deflection plate 2 will deflect back and forth under the action of the driving rod and the driving plate, so that the excess coal blocks between the two adjacent pushing plates can fall into the space between the deflection plate 1 and the arc plate. At the same time, the deflection plate 2 can temporarily block the coal blocks on the screening net 1, ensuring that the pushing assembly will not get stuck during the rotation, thereby ensuring that the coal is completely screened. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0034] Figure 2 Schematic diagram of the structure of the screening mechanism of the present invention;

[0035] Figure 3 for Figure 2 A magnified schematic diagram of the structure of part A in the middle;

[0036] Figure 4 for Figure 2 A magnified schematic diagram of the structure of part B in the middle;

[0037] Figure 5 for Figure 2 A magnified schematic diagram of the structure of the middle C section;

[0038] Figure 6 Schematic diagram of the structure of the screening assembly in the present invention;

[0039] Figure 7 Schematic diagram of the structure of the pusher assembly in the present invention;

[0040] Figure 8 Schematic diagram of the internal structure of the screening shell in the present invention;

[0041] Figure 9 for Figure 8 A magnified schematic diagram of the structure of the middle D section;

[0042] In the figure: 1, gasifier; 2, air supply mechanism; 3, screening shell; 31, chute; 32, first guide plate; 33, feed plate; 34, second guide plate; 35, feed cavity; 36, arc trough; 37, guide groove 1; 38, guide groove 2; 39, drive assembly; 391, drive plate; 392, drive rod; 393, straight groove; 394, spring; 395, hinged rod; 4, screening assembly; 41, screening seat; 411, support plate; 412, Slot; 413, deflection plate 1; 414, deflection plate 2; 415, arc plate; 416, guide rod 1; 417, guide rod 2; 42, screening net 1; 43, screening net 2; 44, pushing assembly; 441, driving shaft; 442, pushing plate; 443, circular plate; 444, supporting rod; 45, arc-shaped retaining ring; 5, baffle mechanism; 51, swivel seat; 511, arc-shaped block; 512, arc-shaped hydraulic rod; 52, partition; 6, clamping plate; 61, operating lever. DETAILED DESCRIPTION

[0043] See also Figures 1 to 9 In an embodiment of the present invention, an underground coal gasification simulation experimental device includes a screening mechanism, a gasifier 1, and a gas supply mechanism 2, wherein the screening mechanism is fixedly arranged at the inlet of the gasifier 1, and the gas supply mechanism 2 is used to supply air, oxygen, and water vapor into the gasifier 1;

[0044] The screening mechanism includes a screening housing 3 and a screening assembly 4, wherein the screening housing 3 is provided with a plurality of chutes 31 inclined vertically, and the screening assembly 4 is slidably arranged in the chutes 31. A feed port is provided at the top of the screening housing 3, and a first guide plate 32 is fixedly arranged at an angle at the feed port. A plurality of conveying plates 33 are fixedly arranged at an angle vertically in the screening housing 3.

[0045] The screening assembly 4 includes a screening seat 41, a screening mesh 1 42, a screening mesh 2 43 and a pushing assembly 44, wherein the screening seat 41 is arc-shaped and is configured with two, a support plate 411 is fixedly arranged on the screening seat 41 at an angle, a screening mesh 1 42 is fixedly arranged between the two support plates 411, an arc-shaped screening mesh 2 43 and an arc-shaped retaining ring 45 are fixedly arranged between the two screening seats 41, two openings are formed between the arc-shaped retaining ring 45 and the screening mesh 2 43, and the pushing assembly 44 is rotatably arranged on the screening seat 41;

[0046] The pushing assembly 44 includes a drive shaft 441 and a push plate 442, wherein the drive shaft 441 is rotatably mounted on the screening seat 41, and a plurality of push plates 442 are fixedly mounted on the drive shaft 441 in a circumferential manner. The push plates 442 rotate along the inner side of the second screening mesh 43 and the arc-shaped retaining ring 45, and a buffer cavity can be formed between two adjacent push plates 442 and the second screening mesh 43;

[0047] The screening seat 41 is provided with a slot 412;

[0048] A plurality of clamping plates 6 are slidably provided on the screening housing 3 , an operating rod 61 is fixedly provided on the clamping plates 6 , and the clamping plates 6 can be clamped into the clamping slots 412 .

[0049] A second guide plate 34 is fixedly arranged on the conveying plate 33 at an angle, a conveying cavity 35 is fixedly arranged on the side of the screening shell 3, and a plurality of through-openings are fixedly opened on the screening shell 3. The conveying plate 33 passes through the through-openings and extends into the conveying cavity 35. A baffle mechanism 5 is rotatably arranged on one end of the conveying plate 33 close to the through-openings, and a discharge port is opened below the conveying cavity 35, and the discharge port is connected to the inlet of the gasifier 1.

[0050] During implementation, the coal is transported from the feed port into the screening mechanism, and the first guide plate 32 causes the coal to fall to the output end of the screening assembly 4 located at the top of the screening shell 3, and then the coal rolls along the screening mesh 1 42. During the rolling process, large coal particles are retained on the screening mesh 1 42, and small coal passes through the screening mesh 1 42 and falls onto the second guide plate 34, and slides along the second guide plate 34 to the next screening assembly 4, and then the coal that has been initially screened slides to the screening mesh 2 43. At this time, the driving shaft 441 is driven to rotate, so that the pushing plate 442 rotates. At this time, the coal will enter between the two adjacent pushing plates 442 as the pushing plate 442 rotates and roll along the inner side of the screening mesh 2 43 as the pushing plate 442 rotates, thereby performing a secondary screening on the coal blocks that have passed through the screening mesh 1 42, and completely screening out the small coal blocks mixed in the large coal blocks, thereby ensuring that the size distribution of the screened coal blocks is uniform. The screened small pieces of coal are then conveyed to the next screening assembly 4 through the second guide plate 34 for screening, and then the second screened coal slides onto the conveying plate 33, and the baffle mechanism 5 is used to block the coal on the conveying plate 33, that is, the screened coal can be temporarily stored on the conveying plate 33, and then the coal is screened step by step through multiple screening assemblies 4, and the coal screened step by step is temporarily stored on the corresponding conveying plate 33. Then, according to the experimental requirements, the corresponding baffle mechanism 5 is opened to convey coal of different sizes into the gasifier 1, and the conveyed coal is of uniform size, thereby making the measured experimental data more accurate and the work of conveying coal of different sizes to the gasifier 1 more convenient. In addition, the screening assembly 4 is slidably arranged on the screening shell 3 as a whole. When a screening assembly 4 is damaged, the entire screening assembly 4 can be directly removed and replaced, thereby effectively reducing the impact of replacing the screening assembly 4 on the coal gasification experiment.

[0051] In this embodiment, Figure 3 and Figure 4 The baffle mechanism 5 includes a rotating seat 51 and a partition 52, wherein the rotating seat 51 is configured as two, the two rotating seats 51 are rotatably set on the screening housing 3, and a partition 52 is fixedly set between the two rotating seats 51;

[0052] An arc-shaped block 511 is fixedly provided on the rotating seat 51, and an arc-shaped hydraulic rod 512 is fixedly provided on the arc-shaped block 511;

[0053] The screening housing 3 is provided with an arc-shaped rotating groove 36 , in which an arc-shaped hydraulic cavity is provided. The arc-shaped hydraulic cavity is connected to an external hydraulic cavity driving mechanism, and the arc-shaped hydraulic rod 512 slides sealingly along the arc-shaped hydraulic cavity.

[0054] During implementation, an external hydraulic drive mechanism is used to introduce hydraulic pressure into the arc-shaped hydraulic cavity, thereby causing the arc-shaped hydraulic rod 512 to rotate along the arc-shaped hydraulic cavity, further driving the swivel seat 51 to rotate, causing the partition 52 to rotate. When the partition 52 rotates to coincide with the feed plate 33, the coal is not blocked by the partition 52 and slides along the feed plate 33 into the feed cavity 35, and falls from the discharge port below the feed cavity 35 to the entrance of the gasifier 1. The coal is then transported to the gasifier 1 for coal gasification experiments. When different When coal of different sizes is transported, the partition 52 is driven to rotate to be perpendicular to the conveying plate 33, thereby blocking the coal on the conveying plate 33, so that the coal no longer falls into the gasifier 1, and then the other baffle mechanisms 5 at the corresponding positions are opened to transport other coal of different sizes into the gasifier 1, so that the replacement of coal does not require the replacement of the screening mesh, and the use of hydraulic pressure to drive the partition 52 to rotate can apply greater power support to the partition 52, thereby ensuring that the partition 52 can effectively rotate to block the coal, and prevent the partition 52 from getting stuck when it is transported.

[0055] In this embodiment, Figure 6 and Figure 9 A deflection plate 1 413 is rotatably provided between the two screening seats 41, and the rotating end of the deflection plate 1 413 coincides with one end of the screening net 2 43. A deflection plate 2 414 is rotatably provided between the two support plates 411. An arc-shaped plate 415 is fixedly provided between the two support plates 411, and the output end of the deflection plate 1 413 is rotatably fitted with the inner wall of the arc-shaped plate 415.

[0056] There is a gap between the first screening mesh 42 and the second screening mesh 43, and the first deflection plate 413 and the second deflection plate 414 can cover the gap;

[0057] A guide rod 1 416 is fixedly provided on the deflection plate 1 413 , and a guide rod 2 417 is fixedly provided on the deflection plate 2 414 ;

[0058] The screening housing 3 is provided with an arc-shaped guide groove 1 37 and a guide groove 2 38, wherein the guide rod 1 416 slides along the guide groove 1 37, and the guide rod 2 417 slides along the guide groove 2 38. A driving assembly 39 is slidably provided in the screening housing 3;

[0059] The driving assembly 39 includes a driving plate 391 and a driving rod 392, wherein two driving plates 391 are provided, and both driving plates 391 are slidably disposed on the screening housing 3. A straight groove 393 is formed on the driving plate 391, and the guide rod 1 416 and the guide rod 2 417 are slidably disposed along the two straight grooves 393, respectively. The driving rod 392 is slidably disposed on the screening housing 3 and a spring 394 is disposed between the driving rod 392 and the screening housing 3. The driving rod 392 is hinged to the two driving plates 391 via a hinged rod 395.

[0060] A circular plate 443 is fixedly provided at one end of the driving shaft 441 and the push plate 442. The circular plate 443 protrudes from the screening seat 41. A plurality of support rods 444 are fixedly provided in a circle on the circular plate 443. The support rods 444 can push the driving rod 392 to slide, and there is an angular deviation between the support rods 444 and the push plate 442.

[0061] When the drive shaft 441 drives the push plate 442 to rotate, the circular plate 443 and the support rod 444 will rotate synchronously, so that the support rod 444 will push the drive rod 392 to slide, and when the support rod 444 disengages from the drive rod 392, the drive rod 392 can be reset under the action of the spring 394, so that the drive rod 392 will slide back and forth during the rotation of the drive shaft 441, thereby causing the guide rod 1 416 and the guide rod 417 to slide back and forth along the guide groove 1 37 and the guide groove 2 38, that is, the deflection plate 1 413 and the deflection plate 2 414 will deflect back and forth, and due to the angular deviation between the support rod 444 and the push plate 442, when the push plate 442 rotates to coincide with the rotating end of the deflection plate 1 413, the support rod 444 will disengage from the drive shaft 441. Rod 392, that is, deflection plate 1 413 and deflection plate 2 414 will be reset at this time, and the coal block will slide between this push plate 442 and the upper push plate 442 adjacent to it. Then, as the push plate 442 rotates, the upper push plate 442 will gradually approach the deflection plate 1 413. Before the upper push plate 442 contacts the deflection plate 1 413, the next support rod 444 will preferentially push the driving rod 392 to slide, thereby causing the deflection plate 1 413 to deflect first, so that the excess coal blocks between the two adjacent push plates 442 can fall onto the deflection plate 1 413, thereby preventing the excessive coal between the two adjacent push plates 442 from causing the push assembly 4 to get stuck, thereby ensuring that the coal can be screened for the second time, that is, ensuring that the size distribution of the screened coal is uniform, thereby improving the accuracy of the experiment.

[0062] In this embodiment, it also includes a gasification reaction mechanism, a monitoring system and a gas analysis and processing system, wherein the gasification reaction mechanism uses a catalyst to promote the gasification reaction and improve the gas quality. The monitoring system includes a gas flow meter for measuring the amount of gas supplied by the gas supply mechanism 2 into the gasifier 1, a gas temperature and pressure sensor for monitoring the temperature and pressure changes in the gasifier 1 and the gasification reaction mechanism, a displacement sensor for monitoring the movement of the coal seam in the gasifier 1, and a thermocouple for measuring the temperature field changes in the gasifier 1 and the gasification reaction mechanism. The gas analysis and processing system uses a gas chromatograph to analyze the gas components generated in the gasifier 1 and uses an online infrared analyzer to monitor the changes in the gas components in the gasifier 1 in real time.

[0063] A method for simulating underground coal gasification experiment, comprising the following steps:

[0064] S1, transporting the coal from the feed port to the screening mechanism for step-by-step screening;

[0065] S1.1. Coal falls onto the topmost screen mesh 1 (42) for primary screening. The screened large lumps of coal slide along screen mesh 1 (42) into screen mesh 2 (43) for secondary screening. The screened small lumps of coal are conveyed by the second guide plate (34) to the next screen mesh 1 (42) for the next screening.

[0066] S1.2. When the initially screened coal lumps enter the second screening mesh 43, the drive shaft 441 is driven to rotate, causing the push plate 442 to rotate. When the push plate 442 rotates, the coal lumps located on the first deflection plate 413 and the second deflection plate 414 fall between two adjacent push plates 442 and roll along the inner side of the second screening mesh 43 as the push plates 442 rotate, further screening the small coal lumps mixed in the large coal lumps.

[0067] S1.3. When the drive shaft 441 rotates, the circular plate 443 drives the support rod 444 to rotate together. Simultaneously, the rotation of the support rod 444 pushes the drive rod 392 to slide, and the hinge rod 395 pushes the two drive plates 391 to slide. The sliding of the two drive plates 391 drives the guide rod 1 416 and the guide rod 2 417 to slide along the guide groove 1 37 and the guide groove 2 38, causing the deflection plate 1 413 and the deflection plate 2 414 to rotate.

[0068] S1.4. The deflector plate 1 413 rotates to allow excess coal between two adjacent push plates 442 to slide into the space formed by the deflector plate 1 413 and the curved plate 415. The deflector plate 2 414 rotates to block the coal on the screening mesh 1 42, allowing the coal between the two adjacent push plates 442 to smoothly transfer into the screening mesh 2 43.

[0069] S2. The secondary screened coal blocks are blocked by the baffle mechanism 5 and temporarily stored on the feed plate 33. Coal blocks of different sizes are fed into the gasifier 1 according to experimental requirements.

[0070] S3. After the coal lump enters the gasifier 1, the gasification agent is injected into the gasifier 1 by the gas supply mechanism 2 to perform a gasification reaction. During the reaction, the temperature, pressure, flow rate and other data are monitored in real time by the monitoring system.

[0071] S4. Record the composition and calorific value of the gasification products in the gasifier 1, collect the gasification products and use the gas analysis and processing system to test and analyze them. Through the collection and analysis of experimental data, evaluate the gasification efficiency, product quality and the optimization effect of the gasification process parameters.

[0072] The above is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. An underground coal gasification simulation experimental device, characterized by: It comprises a screening mechanism, a gasifier (1) and an air supply mechanism (2), wherein the screening mechanism is fixedly arranged at the inlet of the gasifier (1), and the air supply mechanism (2) is used to supply air, oxygen and water vapor into the gasifier (1); The screening mechanism comprises a screening housing (3) and a screening assembly (4), wherein a plurality of chutes (31) are provided on the screening housing (3) and are inclined vertically, and the screening assembly (4) is slidably arranged in the chutes (31); a feed port is provided on the top of the screening housing (3); a first material guide plate (32) is fixedly arranged at an angle at the feed port; and a plurality of material conveying plates (33) are fixedly arranged in the screening housing (3) and are inclined vertically. The screening assembly (4) includes a screening seat (41), a screening net 1 (42), a screening net 2 (43) and a pushing assembly (44), wherein the screening seat (41) is arc-shaped and is provided with two, a support plate (411) is fixedly arranged on the screening seat (41) in an inclined manner, a screening net 1 (42) is fixedly arranged between the two support plates (411), an arc-shaped screening net 2 (43) and an arc-shaped retaining ring (45) are fixedly arranged between the two screening seats (41), two openings are formed between the arc-shaped retaining ring (45) and the screening net 2 (43), and the pushing assembly (44) is rotatably arranged on the screening seat (41).

2. The underground coal gasification simulation experimental equipment according to claim 1, characterized in that: The pushing assembly (44) includes a driving shaft (441) and a pushing plate (442), wherein the driving shaft (441) is rotatably arranged on the screening seat (41), and a plurality of pushing plates (442) are fixedly arranged in a circumferential manner on the driving shaft (441), and the pushing plates (442) rotate along the inner side of the second screening net (43) and the arc-shaped retaining ring (45), and a buffer cavity can be formed between two adjacent pushing plates (442) and the second screening net (43).

3. The underground coal gasification simulation experimental equipment according to claim 1, characterized in that: The screening seat (41) is provided with a slot (412); A plurality of clamping plates (6) are slidably provided on the screening housing (3), an operating rod (61) is fixedly provided on the clamping plates (6), and the clamping plates (6) can be clamped into the clamping slots (412).

4. The underground coal gasification simulation experimental equipment according to claim 1, characterized in that: A second guide plate (34) is fixedly arranged on the conveying plate (33) at an angle, a conveying cavity (35) is fixedly arranged on the side of the screening shell (3), a plurality of through-holes are fixedly opened on the screening shell (3), the conveying plate (33) passes through the through-holes and extends into the conveying cavity (35), a baffle mechanism (5) is rotatably arranged on one end of the conveying plate (33) close to the through-holes, and a discharge port is opened below the conveying cavity (35), and the discharge port is connected to the inlet of the gasifier (1).

5. The underground coal gasification simulation experimental equipment according to claim 4, characterized in that: The baffle mechanism (5) comprises a rotating seat (51) and a partition (52), wherein the rotating seats (51) are configured in two, the two rotating seats (51) are rotatably arranged on the screening housing (3), and a partition (52) is fixedly arranged between the two rotating seats (51); An arc-shaped block (511) is fixedly provided on the rotating seat (51), and an arc-shaped hydraulic rod (512) is fixedly provided on the arc-shaped block (511); The screening housing (3) is provided with an arc-shaped rotating groove (36), the arc-shaped rotating groove (36) is provided with an arc-shaped hydraulic cavity, the arc-shaped hydraulic cavity is connected to an external hydraulic cavity driving mechanism, and the arc-shaped hydraulic rod (512) slides sealingly along the arc-shaped hydraulic cavity.

6. The underground coal gasification simulation experimental equipment according to claim 2, characterized in that: A deflection plate 1 (413) is rotatably provided between the two screening seats (41), and a rotation end of the deflection plate 1 (413) coincides with one end of the screening net 2 (43); a deflection plate 2 (414) is rotatably provided between the two support plates (411); an arc-shaped plate (415) is fixedly provided between the two support plates (411); and an output end of the deflection plate 1 (413) is rotatably fitted with an inner wall of the arc-shaped plate (415); There is a gap between the first screening mesh (42) and the second screening mesh (43), and the first deflection plate (413) and the second deflection plate (414) can cover the gap.

7. The underground coal gasification simulation experimental equipment according to claim 6, characterized in that: A guide rod 1 (416) is fixedly provided on the deflection plate 1 (413), and a guide rod 2 (417) is fixedly provided on the deflection plate 2 (414); The screening housing (3) is provided with an arc-shaped guide groove 1 (37) and a guide groove 2 (38), wherein the guide rod 1 (416) slides along the guide groove 1 (37), and the guide rod 2 (417) slides along the guide groove 2 (38), and a driving assembly (39) is slidably provided in the screening housing (3).

8. The underground coal gasification simulation experimental equipment according to claim 7, characterized in that: The driving assembly (39) includes a driving plate (391) and a driving rod (392), wherein two driving plates (391) are provided, and both driving plates (391) are slidably arranged on the screening housing (3), a straight groove (393) is provided on the driving plate (391), the guide rod 1 (416) and the guide rod 2 (417) are slidably arranged along the two straight grooves (393), the driving rod (392) is slidably arranged on the screening housing (3) and a spring (394) is provided between the driving rod (392) and the screening housing (3), and a hinge rod (395) is hinged to the driving rod (392) and the two driving plates (391); A circular plate (443) is fixedly provided at one end of the driving shaft (441) and the push plate (442), and the circular plate (443) protrudes from the screening seat (41). A plurality of support rods (444) are fixedly provided in a circumferential manner on the circular plate (443), and the support rods (444) can push the driving rod (392) to slide, and there is an angular deviation between the support rods (444) and the push plate (442).

9. The underground coal gasification simulation experimental equipment according to claim 8, characterized in that: The invention also includes a gasification reaction mechanism, a monitoring system and a gas analysis and processing system, wherein the gasification reaction mechanism uses a catalyst to promote the gasification reaction and improve the gas quality, the monitoring system includes a gas flow meter for measuring the amount of gas supplied by the gas supply mechanism (2) into the gasification furnace (1), a gas temperature and pressure sensor for monitoring the temperature and pressure changes in the gasification furnace (1) and the gasification reaction mechanism, a displacement sensor for monitoring the movement of the coal seam in the gasification furnace (1), and a thermocouple for measuring the temperature field changes in the gasification furnace (1) and the gasification reaction mechanism, and the gas analysis and processing system uses a gas chromatograph to analyze the gas components generated in the gasification furnace (1) and uses an online infrared analyzer to monitor the changes in the gas components in the gasification furnace (1) in real time.

10. An underground coal gasification simulation experimental method, using the underground coal gasification simulation experimental equipment according to claim 9, characterized in that: The steps include: S1, transporting the coal from the feed port to the screening mechanism for step-by-step screening; S1.

1. The coal falls onto the topmost screen mesh 1 (42) for primary screening. The large coal pieces after screening slide along the screen mesh 1 (42) into the screen mesh 2 (43) for secondary screening. The small coal pieces after screening are transported to the next screen mesh 1 (42) through the second guide plate (34) for the next screening. S1.

2. When the initially screened coal lumps enter the second screening net (43), the driving shaft (441) is driven to rotate, so that the push plate (442) rotates. When the push plate (442) rotates, the coal lumps located on the first deflection plate (413) and the second deflection plate (414) will fall between the two adjacent push plates (442) and roll along the inner side of the second screening net (43) as the push plate (442) rotates, thereby further screening the small coal lumps mixed in the large coal lumps. S1.

3. When the driving shaft (441) rotates, the circular plate (443) drives the support rod (444) to rotate together. At the same time, the rotation of the support rod (444) pushes the driving rod (392) to slide, and pushes the two driving plates (391) to slide through the hinge rod (395). The sliding of the two driving plates (391) drives the guide rod 1 (416) and the guide rod 2 (417) to slide along the guide groove 1 (37) and the guide groove 2 (38), so that the deflection plate 1 (413) and the deflection plate 2 (414) rotate; S1.4, the deflection plate 1 (413) rotates so that the excess coal between the two adjacent push plates (442) slides into the space formed by the deflection plate 1 (413) and the arc plate (415), and the deflection plate 2 (414) rotates to block the coal on the screening net 1 (42), so that the coal between the two adjacent push plates (442) can be smoothly transferred into the screening net 2 (43); S2, using the baffle mechanism (5) to block the coal blocks that have undergone secondary screening and temporarily storing them on the conveying plate (33), and conveying coal blocks of different sizes into the gasification furnace (1) according to experimental needs; S3. After the coal block enters the gasification furnace (1), the gas supply mechanism (2) is used to inject a gasifying agent into the gasification furnace (1) to perform a gasification reaction. During the reaction, a monitoring system is used to monitor data such as temperature, pressure, and flow in real time. S4. Record the composition and calorific value of the gasification products in the gasifier (1), collect the gasification products and use the gas analysis and processing system to test and analyze them, and evaluate the gasification efficiency, product quality and optimization effect of the gasification process parameters through the collection and analysis of experimental data.

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