Remote control ignition device for coal bed gas drainage test well

Abstract

The application discloses a kind of coalbed methane drainage test well remote control ignition device, including ignition assembly, combustion-supporting gas tank, the ignition assembly is connected with multiple by gas recovery pipe parallel communication, the gas recovery pipe is with each the ignition assembly connection end place and is equipped with control valve, the control valve place is also equipped with coalbed methane concentration detection device, the combustion-supporting gas tank is located in the side of the ignition assembly, by branch pipe and each the ignition assembly communication setting, the branch pipe is with each the ignition assembly connection end and is equipped with flow control valve, the upper end of each the ignition assembly is equipped with combustion cylinder, each the ignition assembly outside installation has testing device.

Description

Technical Field

[0001] This invention relates to the technical field of coalbed methane combustion treatment equipment, specifically to a remote control ignition device for a coalbed methane drainage test well. Background Technology

[0002] The main component of coalbed methane is methane, which is a byproduct of coal formation and metamorphism. It is also known as gas. Its calorific value is almost the same as that of natural gas, and it is relatively inexpensive, making it a clean fuel.

[0003] In the process of coalbed methane resource exploration, it is usually necessary to set up test wells and ignition devices to analyze and study the combustion and explosion characteristics of coalbed methane. The existing ignition devices have relatively simple functions and can only perform single combustion and explosion characteristic tests, which has low applicability. Moreover, since the extracted coalbed methane usually carries water vapor, it affects the stability of the experimental process, the accuracy of the experimental results, and the safety of the experimental process.

[0004] Therefore, it is necessary to provide a remote control ignition device for coalbed methane drainage test wells to solve the problems mentioned in the background art. Summary of the Invention

[0005] To achieve the above objectives, the present invention provides the following technical solution: a remote control ignition device for a coalbed methane drainage test well, comprising: an ignition assembly and a combustion-supporting tank. Multiple ignition assemblies are connected in parallel via gas extraction pipes. A control valve is installed at the connection end between the gas extraction pipe and each ignition assembly. A coalbed methane concentration detection device is also installed at the control valve. The combustion-supporting tank is located beside the ignition assembly and is connected to each ignition assembly via a branch pipe. A flow control valve is installed at the connection end between the branch pipe and each ignition assembly. A combustion cylinder is installed at the upper end of each ignition assembly. A testing device is installed on the outside of each ignition assembly.

[0006] As a preferred embodiment of the present invention, the ignition assembly includes:

[0007] The cylindrical body is a topless cylindrical structure, and an air inlet is provided in the middle of the bottom cover of the cylindrical body.

[0008] An internal cylinder is fixedly disposed in the middle of the cylinder body. A gas channel is formed in the middle of the internal cylinder. Fixed frames are fixed at both the upper and lower ends of the gas channel. A rotating shaft is rotatably inserted in each fixed frame. A spiral fan blade is fixed on the outer periphery of the rotating shaft inside the gas channel.

[0009] A motor is located between the inner cylinder and the inner wall of the cylinder, and the output shaft of the motor extends out of the upper end of the inner cylinder and is driven by the rotating shaft via a belt; and

[0010] A guide vane is coaxially fixed at the lower end of the rotating shaft, and the cross-section of the guide vane is a W-shaped structure.

[0011] As a preferred embodiment of the present invention, an annular pipe is provided on the inner wall of the cylinder between the inner cylinder and the guide plate, and a plurality of downwardly inclined auxiliary air holes are provided on the inner side of the annular pipe and communicate with the branch pipe.

[0012] As a preferred embodiment of the present invention, the spiral fan blades are provided with a plurality of filter holes evenly distributed on them, and both the spiral fan blades and the guide plate are made of hygroscopic materials.

[0013] As a preferred embodiment of the present invention, a collection chamber is fixedly provided at the lower end of the cylinder, and a plurality of guide holes are provided at the lower end of the bottom cover of the cylinder, the guide holes being connected to the collection chamber.

[0014] As a preferred embodiment of the present invention, explosion-proof baffles are provided at intervals above the inner cylinder inside the cylinder, and air vents are provided on the explosion-proof baffles, with a first plate valve provided at the air vents.

[0015] As a preferred embodiment of the present invention, the combustion chamber includes:

[0016] An outer cylinder is coaxially and sealed at the upper end of the cylinder body, and the upper end of the outer cylinder is provided with an inwardly ring-shaped extension.

[0017] An impact plate is longitudinally slidably and sealed inside the lower end of the outer cylinder, and the impact plate and the explosion-proof partition form a burst chamber.

[0018] An inner cylinder is coaxially fixed at the lower end of the extension, and the outer wall of the inner cylinder is spaced apart from the inner wall of the outer cylinder; and

[0019] A bidirectional telescopic rod is located between the inner cylinder and the outer cylinder, and multiple rods are evenly spaced along the circumference of the inner cylinder. The two ends of the bidirectional telescopic rod are respectively fixed between the impact plate and the extension.

[0020] As a preferred embodiment of the present invention, an air outlet pipe is provided in the middle of the impact plate, and an igniter is provided at both the upper and lower ends of the air outlet pipe. Multiple air grooves are provided at the adjacent sections of the air outlet pipe and the igniter. A second plate valve is provided inside the impact plate at the air outlet pipe.

[0021] As a preferred embodiment of the present invention, each of the bidirectional telescopic rods is provided with a pressure sensing device.

[0022] Compared with the prior art, the present invention provides a remote control ignition device for coalbed methane drainage test wells, which has the following beneficial effects:

[0023] In this invention, by introducing different proportions of combustion-supporting gas into multiple ignition components, coalbed methane can be combusted or exploded under different environmental conditions, which facilitates the subsequent exploitation of coalbed methane resources in different regions.

[0024] By setting up structures such as guide vanes and spiral fan blades, the water vapor in the coalbed methane is captured and collected a second time, avoiding the instability of combustion caused by the presence of water vapor and thus preventing safety accidents. On the other hand, the coalbed methane and combustion-supporting gas are diverted, dispersed, and then converged multiple times, so that the two are mixed more thoroughly, which helps the coalbed methane to burn completely and improves the accuracy of data detection.

[0025] The device is equipped with an explosion chamber, a first plate valve, a second plate valve, and two sets of igniters, which enable the device to conduct combustion and explosion tests on coalbed methane separately, thereby improving the applicability of the device. Attached Figure Description

[0026] Figure 1 A schematic diagram of the overall structure of a remote control ignition device for a coalbed methane drainage test well;

[0027] Figure 2 A schematic diagram of the ignition component structure of a remote-controlled ignition device for a coalbed methane drainage test well.

[0028] Figure 3 A schematic diagram of the combustion chamber structure of a remote-controlled ignition device for a coalbed methane drainage test well.

[0029] In the diagram: 1. Ignition assembly; 11. Cylinder body; 12. Inner cylinder; 13. Rotating shaft; 14. Spiral fan blade; 15. Fixing frame; 16. Motor; 17. Guide plate; 18. Explosion-proof partition; 19. First plate valve; 101. Explosion chamber; 111. Guide hole; 2. Gas collection pipe; 3. Control valve; 4. Combustion cylinder; 5. Branch pipe; 51. Annular fitting; 52. Auxiliary gas port; 6. Flow control valve; 7. Combustion cylinder; 71. Outer cylinder; 72. Impact plate; 73. Two-way telescopic rod; 74. Inner cylinder; 75. Gas outlet pipe; 76. Igniter; 77. Second plate valve; 8. Collection chamber. Detailed Implementation

[0030] Please see Figure 1-3 This invention provides a remote control ignition device for a coalbed methane drainage test well, comprising:

[0031] The ignition assembly 1 and the combustion-supporting gas cylinder 4 are provided. Multiple ignition assemblies 1 are connected in parallel through gas sampling pipes 2. Each gas sampling pipe 2 is equipped with a control valve 3 at the connection end with each ignition assembly 1. A coalbed methane concentration detection device is also provided at the control valve 3. The combustion-supporting gas cylinder 4 is located beside the ignition assembly 1 and is connected to each ignition assembly 1 through a branch pipe 5. A flow control valve 6 is provided at the connection end of the branch pipe 5 with each ignition assembly 1. A combustion cylinder 7 is provided at the upper end of each ignition assembly 1. A testing device is installed on the outside of each ignition assembly 1.

[0032] It should be explained that during operation, coalbed methane is drawn from the test well into each ignition component 1 through the gas extraction pipe 2 via remote control and processed. Then, combustion-supporting gas is introduced into each ignition component 1 through the combustion-supporting tank 4 and mixed with coalbed methane in a certain proportion. Finally, a combustion or explosion test is conducted, and the testing device collects experimental data on its combustion and explosion characteristics to provide data support for subsequent coalbed methane resource development.

[0033] In this embodiment, the ignition assembly 1 includes:

[0034] The cylinder 11 is a topless cylinder structure, and an air inlet is provided in the middle of the bottom cover of the cylinder 11.

[0035] An internal cylinder 12 is fixedly disposed in the middle of the cylinder body 11. A gas channel is formed in the middle of the internal cylinder 12. Fixing frames 15 are fixed at both the upper and lower ends of the gas channel. A rotating shaft 13 is rotatably inserted in each fixing frame 15. A spiral fan blade 14 is fixed on the outer periphery of the rotating shaft 13 in the gas channel.

[0036] A motor 16 is located between the inner wall of the inner cylinder 12 and the inner wall of the cylinder body 11, and the output shaft of the motor 16 extends out of the upper end of the inner cylinder 12 and is driven by the rotating shaft 13 via a belt; and

[0037] The guide plate 17 is coaxially fixed at the lower end of the rotating shaft 13, and the cross-section of the guide plate 17 is a W-shaped structure.

[0038] The fixed frame 15 is provided with a channel for supplying coalbed methane.

[0039] In this embodiment, an annular pipe 51 is provided on the inner wall of the cylinder 11 between the inner cylinder 12 and the guide plate 17. The inner side of the annular pipe 51 is provided with a plurality of downwardly inclined auxiliary air holes 52 that are connected to the branch pipe 5.

[0040] In other words, coalbed methane with a measured concentration is introduced into cylinder 11 through gas sampling pipe 2. After entering, the coalbed methane first impacts and contacts the guide plate 17 and diffuses evenly in all directions. By controlling the flow control valve 6, the combustion-supporting gas and coalbed methane are always introduced into cylinder 11 in a preset ratio and mix with each other with the diffused coalbed methane. Then, it enters the gas channel and is buffered and transported by the spiral fan blade 14. By setting multiple ignition components 1, the mixing of coalbed methane and combustion-supporting gas at multiple ratios can be achieved, which makes it easy to observe and collect its combustion state under different conditions.

[0041] In this embodiment, the spiral fan blade 14 is provided with a plurality of filter holes evenly distributed on it, and both the spiral fan blade 14 and the guide plate 17 are made of hygroscopic material.

[0042] In this embodiment, a collection chamber 8 is fixedly provided at the lower end of the cylinder 11, and a plurality of guide holes 111 are opened at the lower end of the bottom cover of the cylinder 11, and the guide holes 111 are connected to the collection chamber 8.

[0043] In other words, by using hygroscopic materials, water vapor in the coalbed methane is captured a second time. First, it is directly impacted by the guide plate 17 for initial collection, and then captured a second time by the rotating spiral fan blades 14. Finally, the collected liquid flows into the collection chamber 8 through the guide hole 111. At the same time, the opening of the filter hole allows the coalbed methane to be split, dispersed and re-converged multiple times during the buffer transportation process, making the two mix more thoroughly. This helps to ensure complete combustion and explosion during coalbed methane characteristic testing and improves the accuracy of data detection.

[0044] In this embodiment, explosion-proof partitions 18 are provided at intervals above the inner cylinder 12 inside the cylinder 11. The explosion-proof partitions 18 are provided with air vents, and a first plate valve 19 is provided at the air vents.

[0045] In this embodiment, the combustion chamber 7 includes:

[0046] The outer cylinder 71 is coaxially and sealed at the upper end of the cylinder 11, and the upper end of the outer cylinder 71 is provided with an annular plate-shaped extension.

[0047] The impact plate 72 is longitudinally slidably and sealed inside the lower end of the outer cylinder 71, and the impact plate 72 and the explosion-proof partition 18 form an explosion chamber 101.

[0048] An inner cylinder 74 is coaxially fixed at the lower end of the extension, and the outer wall of the inner cylinder 74 is spaced apart from the inner wall of the outer cylinder 71; and

[0049] A bidirectional telescopic rod 73 is located between the inner cylinder 74 and the outer cylinder 71, and multiple rods are evenly spaced along the circumference of the inner cylinder 74. The two ends of the bidirectional telescopic rod 73 are respectively fixed between the impact plate 72 and the extension.

[0050] It should be explained that the inner cylinder 74 is made of thermal insulation material.

[0051] In this embodiment, an air outlet pipe 75 is provided through the upper middle part of the impact plate 72, and an igniter 76 is provided at both the upper and lower ends of the air outlet pipe 75. Multiple air slots are provided at the adjacent sections of the air outlet pipe 75 and the igniter 76. A second plate valve 77 is provided inside the impact plate 72 at the air outlet pipe 75.

[0052] In other words, by setting igniters 76 above and below the impact plate 72, ignition can be carried out inside and outside the explosion chamber 101 respectively, and the combustion and explosion characteristics of coalbed methane can be tested and recorded. The height of the gas outlet pipe 75 is higher than the lower end of the inner cylinder 74.

[0053] Specifically, during the combustion test, the first plate valve 19 and the second plate valve 77 are opened, allowing the mixed coalbed methane to enter the outlet pipe 75 at a certain pressure to prevent backfire. The upper igniter 76 is then activated to conduct the combustion experiment, and the combustion characteristics are detected and recorded by the testing device.

[0054] During the explosion experiment, the second plate valve 77 is closed. When the coalbed methane entering the explosion chamber 101 reaches the set pressure value, the first plate valve 19 is then closed and the lower igniter 76 is activated to ignite and explode. The explosion characteristics are detected and recorded by the testing device. At the same time, the bidirectional telescopic rod 73 can monitor the coalbed methane pressure in the explosion chamber 101 and buffer the impact plate 72 during the explosion, and its impact force is detected and recorded. It should be noted that the upper limit of the bidirectional telescopic rod 73 is greater than the explosion impact force when supporting the maximum amount of coalbed methane in the explosion chamber 101.

[0055] In this embodiment, each of the bidirectional telescopic rods 73 is equipped with a pressure sensing device. This allows the test results to be digitized during coalbed methane combustion and explosion characteristic tests, facilitating interpretation and analysis.

[0056] In practice, coalbed methane is drawn from the test well into multiple ignition components and dehydrated by remotely controlling the gas extraction pipe. Then, combustion-supporting gas is introduced into each ignition component through a combustion-supporting tank and mixed with coalbed methane in different set proportions. Finally, a combustion or explosion test is conducted, and the test device collects experimental data on its combustion and explosion characteristics.

[0057] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A remote-controlled ignition device for a coalbed methane drainage test well, characterized in that: include: Ignition assembly (1) and combustion tank (4). Multiple ignition assemblies (1) are connected in parallel through gas sampling pipe (2). A control valve (3) is provided at the connection end of the gas sampling pipe (2) and each ignition assembly (1). A coalbed methane concentration detection device is also provided at the control valve (3). The combustion tank (4) is located on the side of the ignition assembly (1) and is connected to each ignition assembly (1) through a branch pipe (5). A flow control valve (6) is provided at the connection end of the branch pipe (5) and each ignition assembly (1). A combustion cylinder (7) is provided at the upper end of each ignition assembly (1). A testing device is installed on the outside of each ignition assembly (1). The ignition assembly (1) includes: The cylinder (11) is a topless cylinder structure, and an air inlet is provided in the middle of the bottom cover of the cylinder (11); An internal cylinder (12) is fixedly disposed in the middle of the cylinder body (11). A gas channel is formed in the middle of the internal cylinder (12). Fixing brackets (15) are fixedly disposed at both the upper and lower ends of the gas channel. A rotating shaft (13) is rotatably disposed inside each fixing bracket (15). A spiral fan blade (14) is fixedly disposed on the outer periphery of the rotating shaft (13) inside the gas channel. The motor (16) is located between the inner wall of the inner tube (12) and the inner wall of the tube body (11), and the output shaft of the motor (16) extends out of the upper end of the inner tube (12) and is driven by the rotating shaft (13) via a belt. A guide plate (17) is coaxially fixed at the lower end of the rotating shaft (13), and the cross-section of the guide plate (17) is a W-shaped structure. An explosion-proof partition (18) is provided at intervals above the inner cylinder (12) inside the cylinder (11); The combustion chamber (7) includes: The outer cylinder (71) is coaxially and sealed at the upper end of the cylinder body (11), and the upper end of the outer cylinder (71) is provided with an annular plate-shaped extension. An impact plate (72) is longitudinally slidably and sealed at the lower end of the inner cavity of the outer cylinder (71), and the impact plate (72) and the explosion-proof partition (18) form an explosion chamber (101); The inner cylinder (74) is coaxially fixed at the lower end of the extension, and the outer wall of the inner cylinder (74) is spaced apart from the inner wall of the outer cylinder (71). A bidirectional telescopic rod (73) is located between the inner cylinder (74) and the outer cylinder (71), and multiple rods are evenly spaced along the circumference of the inner cylinder (74). The two ends of the bidirectional telescopic rod (73) are respectively fixed between the impact plate (72) and the extension.

2. The remote control ignition device for a coalbed methane drainage test well according to claim 1, characterized in that: An annular pipe (51) is provided on the inner wall of the cylinder (11) between the inner cylinder (12) and the guide plate (17). Multiple auxiliary air holes (52) that are inclined downward and communicate with the branch pipe (5) are provided on the inner side of the annular pipe (51) around its circumference.

3. The remote control ignition device for a coalbed methane drainage test well according to claim 1, characterized in that: The spiral fan blade (14) is provided with a plurality of filter holes evenly distributed on it, and both the spiral fan blade (14) and the guide plate (17) are made of hygroscopic material.

4. The remote control ignition device for a coalbed methane drainage test well according to claim 1, characterized in that: The lower end of the cylinder (11) is provided with a collection chamber (8), and the lower end of the bottom cover of the cylinder (11) is provided with a plurality of guide holes (111), which are connected to the collection chamber (8).

5. The remote control ignition device for a coalbed methane drainage test well according to claim 1, characterized in that: The explosion-proof partition (18) is provided with an air vent, and a first plate valve (19) is provided at the air vent.

6. The remote control ignition device for a coalbed methane drainage test well according to claim 1, characterized in that: An air outlet pipe (75) is provided in the upper middle part of the impact plate (72). An igniter (76) is provided at both the upper and lower ends of the air outlet pipe (75). Multiple air slots are provided at the adjacent sections of the air outlet pipe (75) and the igniter (76). A second plate valve (77) is provided in the impact plate (72) at the air outlet pipe (75).

7. The remote-controlled ignition device for a coalbed methane drainage test well according to claim 1, characterized in that: Each of the bidirectional telescopic rods (73) is equipped with a pressure sensing device.

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