Hidden coal bed gas ignition device

Abstract

The invention discloses a hidden coal bed gas ignition device, which relates to the technical field of coal bed gas combustion equipment, and comprises a lower combustion-supporting component, a middle flame-resisting component, an upper flame-resisting component, a gas inlet pipe and an electronic ignition component, the lower combustion-supporting component, the middle flame-resisting component and the upper flame-resisting component are sequentially connected from bottom to top; the lower combustion-supporting component comprises a lower barrel, a flame stopping plate I and a heat insulation sleeve; an opening in the upper end of the lower cylinder body is sleeved on the flame-resisting plate I; the lower cylinder body is sleeved with the heat insulation sleeve; the air inlet pipe penetrates through and extends into the lower cylinder body; the middle flame stopping part comprises a middle barrel and a second flame stopping plate; an opening in the upper end of the middle barrel is connected to the second flame stopping plate in a sleeving manner; the upper flame stopping component comprises an upper barrel and a heat dissipation cap; the interior of the heat dissipation cap is communicated with the interior of the upper barrel; heat dissipation holes are densely distributed in the top of the heat dissipation cap; the technical effects that combustible gas is fully combusted in a closed mode, combustion supporting and flame stopping are achieved, and the height can be adjusted according to the flow of exhausted gas, and flameless emission is achieved are achieved.

Description

Technical Field

[0001] This invention relates to the field of coalbed methane combustion equipment technology, and in particular to a concealed coalbed methane ignition device. Background Technology

[0002] During coalbed methane drainage operations, the combustible gases generated during drainage must be promptly discharged to ensure operational safety and on-site environmental stability. Currently, the mainstream method in the industry for discharging such combustible gases is to extend the drainage pipeline and increase the length of the pipeline end, installing an ignition device at the end to achieve open flame ignition and discharge.

[0003] However, the aforementioned traditional open-flame emission schemes have many unavoidable technical defects, specifically in the following two aspects: First, significant safety hazards. During open-flame emission, the flame is directly exposed to the external environment. If there is vegetation such as grassland, forest, or shrubs around the emission point, or if there are various flammable production facilities nearby, fire accidents can easily occur due to flame movement and sparks, causing not only economic losses but also damage to the surrounding ecological environment. At the same time, the connection structure between the traditional emission pipeline and the ignition device lacks effective flame-retardant and backflow-prevention designs. When gas emission pressure fluctuates or backflow occurs, it can easily lead to safety risks such as backfire and explosion, threatening the lives of on-site workers. Second, environmental protection and combustion efficiency are difficult to meet. Traditional open-flame combustion methods are greatly affected by environmental factors such as external wind speed and oxygen supply. Combustible gases often cannot be fully burned, and unburned gases and harmful pollutants produced by combustion are directly emitted into the atmosphere, which does not meet the requirements for green and environmentally friendly emissions. Moreover, the heat utilization rate of exposed open-flame combustion is low, and a large amount of heat energy is directly lost, resulting in energy waste.

[0004] To address these issues, the industry has attempted to optimize emission devices, but existing solutions still have significant shortcomings: some solutions simply increase pipeline length or add shielding covers, failing to fundamentally eliminate the risk of open flame exposure; other solutions attempt to use a closed combustion structure, but suffer from incomplete combustion and flames easily escaping from the closed chamber, and the fixed device structure cannot be flexibly adjusted according to the actual exhaust flow, resulting in poor adaptability; at the same time, the heat insulation and combustion-supporting designs of existing devices are inadequate, either causing damage to surrounding facilities due to high-temperature conduction or resulting in low combustion efficiency due to insufficient oxygen supply, making it difficult to meet the complex operating conditions at coalbed methane extraction sites.

[0005] Based on this, the development of a coalbed methane ignition and emission device that can achieve complete combustion of combustible gases in a sealed environment with flameless emission, while also possessing good heat insulation, flame retardant, and backflow prevention properties, and adaptable to different exhaust flow rates, has become a pressing technical challenge in the current coalbed methane drainage field. It is of great significance for improving the safety, environmental protection, and economy of drainage operations. Summary of the Invention

[0006] This application provides a concealed coalbed methane ignition device, which solves the technical problems of incomplete combustion of combustible gases and easy flame leakage from the sealed chamber in the prior art; it achieves the technical effect of complete combustion of combustible gases in a sealed chamber, combustion aid and flame retardant, and flameless emission with adjustable height according to the emission gas flow rate.

[0007] This application provides a concealed coalbed methane ignition device, including a lower combustion-supporting component, a middle flame-retardant component, an upper flame-retardant component, an air inlet pipe, and an electronic ignition component; the lower combustion-supporting component, the middle flame-retardant component, and the upper flame-retardant component are connected sequentially from bottom to top; the lower combustion-supporting component includes a lower cylinder, a flame-retardant plate one, and a heat insulation sleeve; the upper opening of the lower cylinder is fitted onto the flame-retardant plate one; the flame-retardant plate one has multiple openings one; the heat insulation sleeve is fitted onto the lower cylinder; the air inlet pipe passes through and extends into the lower cylinder; the electronic ignition component is located on the outer wall of the upper cylinder, and the ignition end of the electronic ignition component extends into the lower cylinder; the middle flame-retardant component includes a middle cylinder and a flame-retardant plate two; the upper opening of the middle cylinder is fitted onto the flame-retardant plate two; the flame-retardant plate two has multiple openings two; the upper flame-retardant component includes an upper cylinder and a heat dissipation cap; the heat dissipation cap is located on the top of the upper cylinder, and the interior of the heat dissipation cap communicates with the interior of the upper cylinder; the top of the heat dissipation cap is densely covered with heat dissipation holes.

[0008] Preferably, a lower flange is provided at the top of the lower cylinder, intermediate flanges are provided at both ends of the intermediate cylinder, and an upper flange is provided at the bottom of the upper cylinder. The lower flange is sealed to the corresponding intermediate flange, and the upper flange is sealed to the corresponding intermediate flange.

[0009] Preferably, there are multiple intermediate flame-retardant components, which are connected end to end in sequence.

[0010] Preferably, a blower component is also provided on the lower cylinder, with the blower end of the blower component extending into the lower cylinder.

[0011] Preferably, a flame arrester is installed on the portion of the air intake pipe located outside the lower cylinder.

[0012] Preferably, the combustion air duct is installed at one end of the air intake pipe inside the lower cylinder; the combustion air duct is a tubular structure with exhaust holes densely distributed on the side wall, and the bottom opening of the combustion air duct is connected to the air intake pipe, while the top of the combustion air duct is closed.

[0013] Preferably, a connecting valve is installed at the end of the air inlet pipe located outside the lower cylinder.

[0014] Preferably, the flame arrestor plate is provided with a plurality of adjusting plates, the number of adjusting plates being the same as that of the opening and corresponding one-to-one; the adjusting plates are located above the corresponding openings, one end of the adjusting plate is fixed to the flame arrestor plate, and the other end of the adjusting plate abuts against the flame arrestor plate; the adjusting plates are bimetallic plates, and the adjusting plates bend away from the openings after being heated.

[0015] Preferably, a lifting component is also provided above the flame arrestor plate, the lifting component including a lifting plate and a limiting rod; the lifting plate is horizontally arranged above the flame arrestor plate, and the adjusting plate is located between the lifting plate and the flame arrestor plate; the limiting rod is vertically arranged on the flame arrestor plate, and the limiting rod slides through the lifting plate; multiple openings are provided on the lifting plate.

[0016] One or more technical solutions provided in this application have at least the following technical effects or advantages: The concealed coalbed methane ignition device of this application consists of three parts—lower, middle, and upper—connected in a sealed manner from bottom to top, supplemented by an air inlet pipe, an electronic ignition component, and a blower component. The lower combustion-supporting component includes a lower cylinder, a flame-damping plate, and a heat-insulating sleeve (forming a heat-insulating cavity) fitted over the lower cylinder. The flame-damping plate has a specific distribution of openings. The middle flame-damping component includes a middle cylinder and a flame-damping plate with two openings, which can be connected in series in multiple stages. The upper flame-damping component includes an upper cylinder and a heat dissipation cap with heat dissipation holes. The air inlet pipe and the electronic ignition component are staggered and located below the heat-insulating sleeve and extend outwards. The device is installed inside the lower cylinder, with the air inlet pipe connected to the combustion air pipe, and the electronic ignition terminal adjacent to the air outlet of the air inlet pipe. The blowing component provides oxygen, and the air inlet pipe is equipped with a flame arrester. The device achieves flameless and safe combustion through staged combustion, flame isolation, uniform gas distribution, and active oxygen supply. All components are sealed and connected by flanges and other means, and can be anchored and fixed. It solves the technical problems of incomplete combustion of combustible gases and easy flame escape from the sealed chamber in the existing technology. It achieves the technical effect of complete combustion of combustible gases in a sealed environment, combustion assistance and flame inhibition, and flameless emission with adjustable height according to the emission gas flow rate. Attached Figure Description

[0017] Figure 1 This is an overall schematic diagram of the concealed coalbed methane ignition device of the present invention; Figure 2 This is a schematic diagram of the lower combustion-supporting component of the concealed coalbed methane ignition device of the present invention. Figure 3 This is a schematic diagram of the intermediate flame-retardant component of the concealed coalbed methane ignition device of the present invention. Figure 4 This is a schematic diagram of the upper flame-retardant component of the concealed coalbed methane ignition device of the present invention. Figure 5 This is a schematic diagram of the flame arrestor plate of the concealed coalbed methane ignition device of the present invention. Figure 6 This is a schematic diagram of the flame arrestor plate 2 of the concealed coalbed methane ignition device of the present invention; Figure 7 This is a schematic diagram showing the distribution of the regulating plates in the concealed coalbed methane ignition device of the present invention; Figure 8 This is a schematic diagram showing the position of the lifting component of the concealed coalbed methane ignition device of the present invention; Figure 9This is a schematic diagram of the lifting plate of the concealed coalbed methane ignition device of the present invention.

[0018] In the diagram: 10. Lower combustion aid component; 11. Lower cylinder; 12. Flame arrestor plate one; 13. Heat insulation sleeve; 14. Lower flange; 20. Intermediate flame arrestor component; 21. Intermediate cylinder; 22. Flame arrestor plate two; 23. Intermediate flange; 30. Upper flame arrestor component; 31. Upper cylinder; 32. Heat sink cap; 33. Upper flange; 40. Air inlet pipe; 41. Flame arrester; 42. Connecting valve; 43. Combustion air duct; 50. Electronic ignition component; 60. Air blowing component; 70. Adjusting plate; 80. Lifting component; 81. Limiting rod; 82. Lifting plate. Detailed Implementation

[0019] To facilitate understanding of the present invention, a more complete description of this application will be given below with reference to the accompanying drawings, which illustrate preferred embodiments of the invention. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to enable a more thorough and complete understanding of the disclosure of the present invention.

[0020] It should be noted that the terms "vertical," "horizontal," "up," "down," "left," "right," and similar expressions used in this article are for illustrative purposes only and do not represent the only possible implementation.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to limit the invention; the term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0022] Example 1: As Figures 1 to 6 As shown, the concealed coalbed methane ignition device of this application includes a lower combustion-supporting component 10, a middle flame-retardant component 20, an upper flame-retardant component 30, an air inlet pipe 40, and an electronic ignition component 50.

[0023] The lower combustion-supporting component 10, the middle flame-retardant component 20, and the upper flame-retardant component 30 are connected together from bottom to top.

[0024] The lower combustion-supporting component 10 includes a lower cylinder 11, a flame-damping plate 12, and a heat-insulating sleeve 13.

[0025] The flame arrestor plate 12 is set horizontally, and the upper opening of the lower cylinder 11 is fitted onto the flame arrestor plate 12.

[0026] The lower cylinder 11 can be a vertically arranged circular tube structure.

[0027] The flame-retardant plate 12 can be installed at the upper opening of the lower cylinder 11 by welding or bolting.

[0028] The flame-retardant plate 12 has multiple openings.

[0029] It should be noted that multiple openings can be 20, 30, 40, 50, or 60 openings, and the specific number and location can be selected according to actual needs, which will not be detailed here.

[0030] Optionally, the flame arrestor plate 12 may not have an opening at its center, and this position may be a blind plate structure; for example, the flame arrestor plate 12 may not have an opening within a circle with a diameter of 50 mm at its center.

[0031] Optionally, the diameter of the first opening is 15 mm to 25 mm, such as 20 mm.

[0032] Optionally, the lower cylinder 11 can be made of 339.7 mm oil casing, and the height of the lower cylinder 11 can be 2.5 meters.

[0033] Optionally, the flame-retardant plate 12 can be made of a steel plate with a thickness of 10 mm.

[0034] The heat insulation sleeve 13 is installed outside the lower cylinder 11.

[0035] Optionally, the heat insulation sleeve 13 can be made of a steel plate with a thickness of 3 mm, and the diameter of the heat insulation sleeve 13 can be 540 mm. The heat insulation sleeve 13 can be installed on the lower cylinder 11 by welding or bolting.

[0036] It should be noted that the heat insulation sleeve 13 can be a hollow cylinder with openings at both ends. The lower cylinder 11 passes through the heat insulation sleeve 13, and the openings at both ends of the heat insulation sleeve 13 are the same as the outer diameter of the lower cylinder 11. The inner diameter of the heat insulation sleeve 13 is larger than the outer diameter of the lower cylinder 11, so that a heat insulation cavity is formed between the lower cylinder 11 and the heat insulation sleeve 13.

[0037] The air inlet pipe 40 is located below the heat insulation sleeve 13, and the air inlet pipe 40 passes through and extends into the lower cylinder 11.

[0038] The electronic ignition component 50 is located below the heat insulation sleeve 13 and on the outer wall of the upper cylinder 31. The ignition end of the electronic ignition component 50 (such as an ignition coil or ignition wire) extends into the lower cylinder 11.

[0039] The intake pipe 40 and the electronic ignition component 50 are staggered.

[0040] Optionally, the bottom end of the lower cylinder 11 is a certain distance away from the bottom end of the heat insulation sleeve 13 to facilitate the installation of the electronic ignition component 50 and the air inlet pipe 40, such as the bottom end of the lower cylinder 11 being 800 mm away from the bottom end of the heat insulation sleeve 13.

[0041] Optionally, the electronic ignition component 50 can be an industrial burner ignition coil (such as the ignition coil for Siemens QRA53.G27) or an industrial-grade low-voltage DC arc ignition assembly. The electronic ignition component 50 is a common structure in the prior art and will not be described in detail here.

[0042] Optionally, the ignition end of the electronic ignition component 50 can extend to the outlet end of the air intake pipe 40, and the ignition end of the electronic ignition component 50 can be supported by a bracket (not shown in the figure), which is common knowledge.

[0043] Optionally, a maintenance door may be provided at the bottom of the lower cylinder 11 to facilitate the cleaning of residue; a ventilation grille may be provided at the bottom of the lower cylinder 11 to facilitate the entry of fresh air from the outside into the lower cylinder 11 to assist combustion; both the maintenance door and the ventilation grille are common knowledge.

[0044] The intermediate flame-retardant component 20 includes an intermediate cylinder 21 and a flame-retardant plate 22.

[0045] Flame-stopping plate 22 is set horizontally, and the upper opening of the intermediate cylinder 21 is fitted onto flame-stopping plate 22.

[0046] The intermediate cylinder 21 can be a vertically arranged circular tube structure.

[0047] Flame-damping plate 22 can be installed at the upper opening of the intermediate cylinder 21 by welding or bolting.

[0048] Multiple openings are provided on the flame-retardant plate 22.

[0049] It should be noted that multiple openings can be 20, 30, 40, 50, or 60 openings, etc. The specific quantity and location can be selected according to actual needs, which will not be detailed here.

[0050] Optionally, the diameter of the second opening is 15 mm to 25 mm, such as 20 mm.

[0051] Optionally, the intermediate cylinder 21 can be made of 339.7 mm oil casing, and the height of the intermediate cylinder 21 can be 1.5 meters.

[0052] Optionally, the flame arrestor plate 22 can be made of a steel plate with a thickness of 5 mm.

[0053] It should be noted that the center of the flame arrestor plate 22 may or may not be a blind plate (i.e., it may have an opening 2), and the choice can be made according to the actual needs.

[0054] The bottom opening of the intermediate cylinder 21 is coaxially and sealed with the top opening of the lower cylinder 11.

[0055] The upper flame-retardant component 30 includes an upper cylinder 31 and a heat dissipation cap 32.

[0056] The bottom opening of the upper cylinder 31 is coaxially and sealed with the top opening of the middle cylinder 21.

[0057] The heat dissipation cap 32 is located on the top of the upper cylinder 31, and the interior of the heat dissipation cap 32 is connected to the interior of the upper cylinder 31.

[0058] The top of the heat sink 32 is covered with heat dissipation holes.

[0059] It should be noted that the number, location, and diameter of the heat dissipation holes can be selected according to actual needs. For example, the number of heat dissipation holes can be 30, 40, or 50, and the diameter of the heat dissipation holes can be 20 mm or 30 mm.

[0060] It should be added that the upper cylinder 31 in this embodiment can be made of a 339.7 mm oil casing with an annular steel plate (not shown in the figure). The annular steel plate is welded to the top opening of the 339.7 mm oil casing, and the heat dissipation cap 32 can be connected to the annular steel plate by bolt fixing or welding. This structure and connection method are common in the prior art.

[0061] Optionally, a lower flange 14 may be provided at the top of the lower cylinder 11, intermediate flanges 23 may be provided at both ends of the intermediate cylinder 21, and an upper flange 33 may be provided at the bottom of the upper cylinder 31. The lower flange 14 may be sealed to the corresponding intermediate flange 23, and the upper flange 33 may be sealed to the corresponding intermediate flange 23.

[0062] It should be noted that there may be multiple intermediate flame-retardant components 20 in this embodiment, and multiple intermediate flame-retardant components 20 are connected end to end in sequence; that is, the intermediate flanges 23 on adjacent intermediate cylinders 21 are connected together in a sealed manner; the number of intermediate flame-retardant components 20 can be selected according to actual needs, which will not be elaborated here.

[0063] Among them, the flanges (lower flange 14, intermediate flange 23 or upper flange 33) can be connected together by welding.

[0064] Furthermore, a blower component 60 is also provided on the lower cylinder 11, with the blower end of the blower component 60 extending into the lower cylinder 11.

[0065] It should be noted that the air blowing component 60 is located below the heat insulation sleeve 13. The air blowing component 60 can be an air supply component such as an air pump or blower, used to deliver fresh air (mainly oxygen) into the lower cylinder 11.

[0066] Furthermore, a flame arrester 41 is installed on a portion of the air intake pipe 40 located outside the lower cylinder 11.

[0067] It should be noted that the flame arrester 41 is a common structure in the prior art, and the specific type can be selected according to actual needs (such as a pipeline flame arrester), which will not be elaborated here.

[0068] The intake pipe 40 has an opening at one end inside the lower cylinder 11 where a combustion air pipe 43 can be installed.

[0069] The combustion air duct 43 can be located at the central axis of the lower cylinder 11, and the combustion air duct 43 is higher than the maintenance door and ventilation grille.

[0070] The combustion air duct 43 is a tubular structure with exhaust holes densely distributed on its side wall, and the bottom opening of the combustion air duct 43 is connected to the air intake pipe 40, while the top of the combustion air duct 43 is closed.

[0071] It should be noted that the number, location, and diameter of the exhaust holes can be selected according to actual needs. For example, the number of exhaust holes can be 30, 40, or 50, and the diameter of the heat dissipation holes can be 15 mm or 25 mm.

[0072] Among them, the combustion air duct 43 is used to assist in the more dispersed and uniform discharge of combustible gas.

[0073] An opening at one end of the air inlet pipe 40 outside the lower cylinder 11 can be fitted with a connecting valve 42.

[0074] It should be noted that the connecting valve 42 is a common structure in the prior art, and the specific type (such as a gate valve) can be selected according to actual needs, which will not be elaborated here.

[0075] It should be noted that the dimensions of the components involved in this embodiment are only preferred embodiments of the present invention and are not intended to limit the present invention. Different size parameters and shapes can be selected according to the exhaust pressure of the intake pipe 40.

[0076] It should be added that multiple ground anchor hooks (not shown in the figure) can be installed on the outer wall of the upper cylinder 31, which can be used with ground anchors (not shown in the figure) and steel wires (not shown in the figure) to anchor the entire device. This is common knowledge.

[0077] Specifically, in actual operation, relevant personnel determine the number (which can be increased or decreased) of intermediate flame arrestor components 20 based on the on-site coalbed methane emission flow rate. Through the sealing connection of lower flange 14, intermediate flange 23, and upper flange 33, the lower combustion-supporting component 10, intermediate flame arrestor components 20, and upper flame arrestor components 30 are assembled into a whole from bottom to top. The entire device is anchored using steel wire ropes to ensure operational stability. The sealing of each component connection is checked, and it is confirmed that the maintenance door is closed and the connecting valve 42 is in the closed state. Connect the coalbed methane delivery pipeline to the connecting valve 42 of the inlet pipe 40, check the installation of the flame arrester 41 to ensure that it can play a normal role in preventing backfire and gas backflow; check the power supply and operation status of the blower component 60 and the electronic ignition component 50 to ensure that the ignition end is fixed in place by the bracket and extends to the vicinity of the outlet end of the inlet pipe 40. When the connecting valve 42 is opened, the coalbed methane enters the combustion air duct 43 through the air inlet pipe 40 and diffuses evenly into the lower cylinder 11 through the exhaust holes densely distributed on the side wall of the combustion air duct 43. The electronic ignition component 50 is activated by remote control to ignite the diffused coalbed methane and form initial combustion in the lower cylinder 11 (first-stage combustion chamber). At this time, the flame generated by combustion is confined inside the lower cylinder 11, and the heat insulation cavity formed by the heat insulation sleeve 13 and the lower cylinder 11 can prevent the external structure from overheating. The blower component 60 can be activated synchronously, and fresh air enters the interior through the ventilation grille at the bottom of the lower cylinder 11 to replenish sufficient oxygen for subsequent combustion. After initial combustion, the gas, carrying unburned combustible components, enters the intermediate cylinder 21 (secondary and above combustion chambers) through the opening on the flame-damping plate 12. The mesh distribution design of the flame-damping plate 12 ensures uniform gas diffusion while preventing direct flame rise and reducing flame intensity. The gas further combusts within the intermediate cylinder 21. If multiple intermediate flame-damping components 20 are installed, the gas will be conducted upwards sequentially through the openings on each flame-damping plate 22, achieving multiple rounds of complete combustion.

[0078] The gas, after undergoing multi-stage combustion, is completely burned off, leaving only residual heat. It then rises into the upper cylinder 31 and is discharged through the densely packed heat dissipation holes at the top of the heat dissipation cap 32. No flame overflows during the discharge process, achieving the goal of flameless emission. During operation, combustion residue can be cleaned periodically through the maintenance door to ensure combustion efficiency. When coalbed methane emissions are finished or maintenance is required, first close the connecting valve 42 to stop the gas intake; keep the blowing component 60 running for a period of time to purge the residual gas in the device before closing it; turn off the power supply to the electronic ignition component 50, open the maintenance door to clean the internal residue, and check the condition of components such as the flame arrestor plate and flange seal to ensure reliability for the next use.

[0079] Understandably, the porous diffusion structure of the combustion duct 43 ensures that the coalbed methane is evenly distributed in the combustion chamber during the initial combustion stage, improving the ignition success rate while preventing incomplete combustion or localized flame spikes caused by excessively high local gas concentrations. The staged structure of "lower cylinder 11 (first-stage combustion chamber) + intermediate cylinder 21 (multi-stage combustion chamber)" utilizes the flame-damping effect of flame-damping plates 12 and 22 to confine the flame within each combustion chamber, preventing flame escape from the device. Simultaneously, gas conduction in each combustion chamber must pass through the flame-damping plates (flame-damping plate 12 and flame-damping plate 22). The mesh further refines the gas flow pattern, extends the combustion path, and ensures complete combustion of combustible components. To address the issue of insufficient oxygen in the closed combustion chamber, fresh air is actively supplied through the blower component 60, combined with the passive air intake of the ventilation grille, ensuring a continuous and sufficient combustion reaction and preventing the production of harmful unburned gases such as carbon monoxide due to oxygen deficiency. At the same time, it suppresses unstable flame movement caused by oxygen deficiency. The flame arrester 41 blocks the path of the combustion flame backflow to the air intake pipe 40, preventing upstream pipeline explosions. The double-layer structure of the heat insulation sleeve 13 isolates the high temperature of the combustion chamber, preventing the ignition of surrounding vegetation or flammable facilities.

[0080] Example 2: Figure 7 As shown, the flame arrestor plate 12 is provided with multiple adjusting plates 70, and the number of adjusting plates 70 is the same as that of the opening 1 and they correspond one-to-one.

[0081] The adjusting plate 70 is located above the corresponding opening 1. One end of the adjusting plate 70 is fixed on the flame arrestor plate 12, and the other end of the adjusting plate 70 abuts against the flame arrestor plate 12.

[0082] It should be noted that one end of the adjusting plate 70 can be fixed to the flame arrestor plate 12 by bolts or welding.

[0083] The adjusting plate 70 is a bimetallic strip, and the adjusting plate 70 bends away from the opening when heated.

[0084] Among them, the regulating plate 70 can be a high-temperature alloy-based bimetallic plate, such as nickel-chromium alloy (active layer) + nickel-based high-temperature alloy (passive layer).

[0085] It should be noted that the width of the adjusting plate 70 can be smaller than the diameter of the opening 1, so that the adjusting plate 70 will not completely block the opening 1 under normal temperature conditions, which facilitates the gas flow in the space above and below the opening 1.

[0086] Specifically, after remote ignition, the coalbed methane in the lower cylinder 11 generates heat through combustion, and the temperature near the flame rises rapidly. The heat is conducted to the flame-damping plate 12 and the regulating plate 70 above it. Due to the thermal deformation characteristics of the bimetallic strip, the regulating plate 70 bends away from the opening 1, and the effective flow area of ​​the opening 1 increases accordingly. As combustion continues, if the flow rate of combustible gas in the lower cylinder 11 increases and the combustion temperature rises, the bending degree of the regulating plate 70 will increase accordingly, and the flow area of ​​the opening will be further expanded to ensure that the gas after combustion can smoothly enter the intermediate cylinder 21. If the gas flow rate decreases and the temperature drops, the bending degree of the regulating plate 70 will rebound, and the flow area of ​​the opening will be reduced accordingly to avoid incomplete combustion caused by excessive gas flow rate. After the air intake stops, the temperature inside the lower cylinder 11 gradually drops to room temperature, and the regulating plate 70 returns to its initial contact state.

[0087] Understandably, when the air intake flow rate is large and the combustion temperature is high, the flow area increases to ensure timely discharge of high-temperature flue gas and avoid excessive pressure in the primary combustion chamber. When the air intake flow rate is small and the combustion temperature is low, the flow area decreases to slow down the gas flow rate and prolong the residence time of combustible gas in the primary combustion chamber, ensuring complete combustion. The regulating plate 70 can dynamically adjust the flow area according to the combustion temperature and automatically match the gas discharge requirements under different air intake flow rates. Even if the coalbed methane discharge flow rate fluctuates significantly, it can ensure the stable combustion intensity of the primary combustion chamber, avoid the flame from becoming too strong or too weak or going out, and broaden the operating condition adaptability range of the device. When the intake air flow is small, the bending degree of the regulating plate 70 is small, the flow area of ​​the opening is reduced, which slows down the upward conduction speed of the gas and prolongs the residence time of combustible gas in the primary combustion chamber. In conjunction with the oxygen supply system, this makes the combustible components burn more completely. When the flow is large, the flow area is increased, avoiding local overheating caused by the retention of high-temperature flue gas. Overall, this further reduces the emission of harmful gases such as carbon monoxide and unburned hydrocarbons. The bending direction of the regulating plate 70 is always away from the opening 1. Under high-temperature combustion conditions, the raised structure of the regulating plate 70 can form a "dynamic flame-retardant barrier". Combined with the flame-retardant function of the flame-retardant plate 12 itself, it further prevents the flame from directly rising through the opening 1 to the intermediate combustion chamber, reducing the risk of flame overflow and improving the safety protection level of the device.

[0088] Example 3: Figure 8 and Figure 9 As shown, a lifting component 80 is also provided above the flame arrestor plate 12. The lifting component 80 includes a lifting plate 82 and a limit rod 81.

[0089] The lifting plate 82 is horizontally positioned above the flame arrestor plate 12, and the adjusting plate 70 is located between the lifting plate 82 and the flame arrestor plate 12.

[0090] The limiting rod 81 is vertically set on the flame arrestor plate 12, and the limiting rod 81 slides through the lifting plate 82.

[0091] It should be noted that there can be one or more limit rods 81 (e.g., there can be two limit rods 81); when there is one limit rod 81, the limit rod 81 is not a circular rod (e.g., a square rod, a triangular rod), so that the lifting plate 82 can only move vertically along the limit rod 81.

[0092] It should be added that, in this embodiment, the lifting plate 82 abuts against the upper part of the multiple adjusting plates 70.

[0093] The lifting plate 82 has multiple openings 3, the diameter of which is larger than that of opening 1.

[0094] It should be noted that multiple open threes can be 16, 17, 18, 19, or 20 open threes, etc. The specific number and position can be selected according to actual needs, which will not be detailed here.

[0095] Optionally, the diameter of the third opening can be 30 mm to 50 mm, such as 40 mm. Optionally, the lifting plate 82 may be made of a steel plate with a thickness of 3 mm, and the diameter of the lifting plate 82 shall not be greater than the diameter of the flame arrestor plate 12.

[0096] Optionally, the height of the limit rod 81 may be greater than the length of the adjusting plate 70.

[0097] It should be noted that the limiting rod 81 can be a T-shaped rod. The top diameter of the limiting rod 81 is large to prevent the lifting plate 82 from disengaging from the limiting rod 81. This structure is common knowledge.

[0098] It should be added that the length of the adjusting plate 70 in this embodiment has a decisive influence on the lifting height of the lifting plate 82. The length of the adjusting plate 70 can be 35 mm to 50 mm. The specific length value can be selected according to actual needs, which will not be elaborated here.

[0099] Specifically, after remote ignition, the coalbed methane in the lower cylinder 11 burns and heats up. The heat is conducted to the regulating plate 70, and the bimetallic strip bends away from the opening 1 when heated. Its free end pushes up the lifting plate 82, and the lifting plate 82 rises vertically along the limiting rod 81. As the combustion temperature increases, the bending degree of the regulating plate 70 increases, and the rising height of the lifting plate 82 increases simultaneously. The effective flow area of ​​the opening 1 expands accordingly, ensuring that the high-temperature flue gas smoothly enters the intermediate cylinder 21.

[0100] If the intake air flow fluctuates, causing changes in combustion temperature, when the regulating plate 70 is heated and bent, its free end tilts upward, generating a uniform pushing force on the top lifting plate 82. Due to the guiding constraint of the limiting rod 81, the lifting plate 82 cannot rotate and can only rise and fall vertically along the limiting rod 81. The lifting height is positively correlated with the degree of bending of the regulating plate 70. The greater the degree of bending of the regulating plate 70, the higher the lifting plate 82 rises.

[0101] Meanwhile, the length and maximum bending angle of the adjusting plate 70 determine the maximum stroke of the lifting plate 82, preventing the lifting plate 82 from rising excessively and causing control failure, thus achieving controllability of the displacement stroke.

[0102] When the lifting plate 82 is in a low position, the space between the lifting plate 82 and the flame arrestor plate 12 (this space is defined as the variable space) is small, the gas flow resistance is large, the flow rate is slowed down, the combustion time of combustible gas in the first-stage combustion chamber and the variable space is extended, and the combustion is ensured under low flow conditions. When the lifting plate 82 is in a high position, the variable space between the lifting plate 82 and the flame arrestor plate 12 is large, the gas flow resistance is small, the flow rate is accelerated, and the high-temperature flue gas is discharged in time, avoiding excessive pressure in the combustion chamber under high flow.

[0103] After the gas enters the intermediate combustion chamber through the opening, the limiting lifting structure of the lifting plate 82 ensures that the lifting plate 82 is in a horizontal state. The gas diffuses evenly above the flame arrestor plate 12 and the combustion is more stable after entering the intermediate cylinder 21.

[0104] The thermal deformation of the regulating plate 70 is converted into the displacement of the lifting plate 82, and then the flow rate is precisely controlled by the change of the variable space volume.

[0105] The lifting plate 82 always covers the flame-damping plate 12. Even in a high position, the lifting plate 82 can form a "dynamic shielding barrier" for the flame. At the same time, the staggered setting of the opening 3 and the opening 1 can further prevent the flame from rising directly upward. Combined with the flame-damping function of the flame-damping plate, the risk of the flame overflowing from the primary combustion chamber is reduced.

[0106] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A concealed coalbed methane ignition device, characterized in that, It includes a lower combustion-supporting component (10), a middle flame-retardant component (20), an upper flame-retardant component (30), an air intake pipe (40), and an electronic ignition component (50). The lower combustion-supporting component (10), the middle flame-retardant component (20), and the upper flame-retardant component (30) are connected sequentially from bottom to top; The lower combustion-supporting component (10) includes a lower cylinder (11), a flame-damping plate (12), and a heat insulation sleeve (13); the upper opening of the lower cylinder (11) is sleeved on the flame-damping plate (12); the flame-damping plate (12) has multiple openings; the heat insulation sleeve (13) is sleeved on the lower cylinder (11). The air intake pipe (40) passes through and extends into the lower cylinder (11); The electronic ignition component (50) is located on the outer wall of the upper cylinder (31), and the ignition end of the electronic ignition component (50) extends into the lower cylinder (11); The intermediate flame-retardant component (20) includes an intermediate cylinder (21) and a flame-retardant plate (22); the upper opening of the intermediate cylinder (21) is fitted onto the flame-retardant plate (22); the flame-retardant plate (22) has multiple openings. The upper flame-retardant component (30) includes an upper cylinder (31) and a heat dissipation cap (32); the heat dissipation cap (32) is located on the top of the upper cylinder (31), and the interior of the heat dissipation cap (32) is connected to the interior of the upper cylinder (31); the top of the heat dissipation cap (32) is densely covered with heat dissipation holes.

2. The concealed coalbed methane ignition device as described in claim 1, characterized in that, The lower cylinder (11) is provided with a lower flange (14) at the top, the middle cylinder (21) is provided with intermediate flanges (23) at both ends, and the upper cylinder (31) is provided with an upper flange (33) at the bottom. The lower flange (14) is sealed to the corresponding intermediate flange (23), and the upper flange (33) is sealed to the corresponding intermediate flange (23).

3. The concealed coalbed methane ignition device as described in claim 1, characterized in that, There are multiple intermediate flame-retardant components (20), and the multiple intermediate flame-retardant components (20) are connected end to end in sequence.

4. The concealed coalbed methane ignition device as described in claim 1, characterized in that, The lower cylinder (11) is also provided with a blower (60), and the blower end of the blower (60) extends into the lower cylinder (11).

5. The concealed coalbed methane ignition device as described in claim 1, characterized in that, The portion of the air intake pipe (40) located outside the lower cylinder (11) is equipped with a flame arrester (41).

6. The concealed coalbed methane ignition device as described in claim 1, characterized in that, The intake pipe (40) is located inside the lower cylinder (11) with one end open to provide a combustion air pipe (43); the combustion air pipe (43) is a tubular structure with exhaust holes densely distributed on the side wall, and the bottom opening of the combustion air pipe (43) is connected to the intake pipe (40), while the top of the combustion air pipe (43) is closed.

7. The concealed coalbed methane ignition device as described in claim 1, characterized in that, The air inlet pipe (40) is connected to a valve (42) at one end outside the lower cylinder (11).

8. The concealed coalbed methane ignition device as described in claim 1, characterized in that, The flame arrestor plate (12) is provided with a plurality of adjusting plates (70), and the number of adjusting plates (70) is the same as that of the opening and they correspond one to one; The adjusting plate (70) is located above the corresponding opening one. One end of the adjusting plate (70) is fixed on the flame arrestor plate one (12), and the other end of the adjusting plate (70) abuts against the flame arrestor plate one (12). The adjusting plate (70) is a bimetallic plate, and the adjusting plate (70) bends away from the opening after being heated.

9. The concealed coalbed methane ignition device as described in claim 8, characterized in that, A lifting component (80) is also provided above the flame arrestor plate (12). The lifting component (80) includes a lifting plate (82) and a limiting rod (81). The lifting plate (82) is horizontally positioned above the flame arrestor plate (12), and the adjusting plate (70) is located between the lifting plate (82) and the flame arrestor plate (12); The limiting rod (81) is vertically set on the flame arrestor plate (12), and the limiting rod (81) slides through the lifting plate (82). The lifting plate (82) has multiple openings.

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