Plasma-assisted, backfire-proof, low-concentration gas burner and method of operation thereof

Abstract

This invention relates to the field of plasma ignition and combustion technology, and particularly to a low-concentration gas burner with plasma-assisted combustion and its operation method, which prevents backfire. The technical solution includes a primary path assembly comprising a first flame-arresting cyclone and a plasma discharge section. The plasma discharge section is located downstream of the first flame-arresting cyclone and includes a central anode and a grounding electrode sleeve, which are coaxially arranged, forming a discharge gap between them. It also includes a secondary path assembly comprising a secondary air inlet sleeve and a second flame-arresting cyclone. This invention integrates multi-stage composite flame arrest, cyclone stabilization, Laval tube acceleration, and plasma ignition through coaxial nesting, resulting in a compact structure, high flame arrest efficiency, good ignition and flow field coordination, reliable operation, and strong adaptability to various operating conditions.

Description

Technical Field

[0001] This invention relates to the field of plasma ignition and combustion technology, and in particular to a plasma-assisted combustion-resistant low-concentration gas burner with backfire prevention and its operation method. Background Technology

[0002] Coal mining generates large amounts of low-concentration methane. The warming potential of an equal mass of methane is 21 times that of carbon dioxide, resulting in a far greater greenhouse effect. Its ozone-depleting capacity is equivalent to seven times that of carbon dioxide, posing a severe challenge to atmospheric safety. The low concentration of methane in methane, within its explosive limits, makes it difficult to utilize using conventional combustion methods. Burners are prone to backfire and even explosions, and low-concentration methane is easily extinguished. Therefore, it is necessary to develop burners with backfire prevention and combustion-supporting functions.

[0003] Currently, preventing backfire mainly relies on passive flame arresters such as wire mesh and perforated plates installed in pipelines, or on burners with specific structures. For example, patent CN111853782A discloses "a backfire-proof burner," which reduces the probability of backfire by setting multiple layers of combustion plates stacked on the combustion plate and using physical structure and changes in airflow direction. This type of solution mainly relies on a single flow channel geometry design, and its flame arresting effectiveness may be insufficient in the face of high-speed backfire or extreme operating conditions, and it is not suitable for the stable combustion of low-calorific-value fuels. At the same time, existing technologies attempt to combine flame arresting and ignition functions, but most are simple series connections, failing to achieve functional synergy and structural optimization. For example, Laval nozzles are used for acceleration and in conjunction with central electrode ignition, but an effective multi-stage flame arresting structure is not integrated upstream of the igniter, resulting in insufficient backfire prevention capability. Therefore, existing technical solutions cannot provide sufficient backfire protection for the igniter itself and upstream systems while ensuring high ignition performance. Therefore, this application proposes a plasma-assisted backfire-proof low-concentration gas burner and its operation method. Summary of the Invention

[0004] The purpose of this invention is to address the contradictions in the prior art, namely, that existing burners are prone to backfire under extreme operating conditions and that traditional igniters lack backfire protection capabilities while achieving efficient ignition. The invention proposes a plasma-assisted combustion-resistant low-concentration gas burner with backfire prevention and its operation method.

[0005] The technical solution of the present invention: a plasma-assisted combustion backfire-preventing low-concentration gas burner, comprising a primary path assembly, wherein the primary path assembly comprises a first flame arrestor cyclone and a plasma discharge section, the plasma discharge section being disposed downstream of the first flame arrestor cyclone, the plasma discharge section comprising a central anode and a grounding electrode sleeve, the two being coaxially disposed, and a discharge gap being formed between the central anode and the grounding electrode sleeve.

[0006] It also includes a secondary passage assembly, which includes a secondary air intake sleeve and a second flame arrestor cyclone. The secondary air intake sleeve is coaxially sleeved on the outside of the grounding electrode sleeve. An annular channel is formed between the secondary air intake sleeve and the grounding electrode sleeve, and the outlet end of the annular channel is provided with a second flame arrestor cyclone.

[0007] The first flame-arresting cyclone and the second flame-arresting cyclone are respectively selected from one of the following: microporous channel type cyclone, porous interlocking type cyclone, and porous combined type cyclone;

[0008] The microporous channel type hydrocyclone is composed of multiple independent microporous channels or slits with swirling angles;

[0009] The porous interlocking hydrocyclone is composed of porous media material filled into the flow channel of a conventional hydrocyclone.

[0010] The porous composite hydrocyclone is formed by placing porous media material upstream or downstream of the hydrocyclone.

[0011] Optionally, the primary path assembly further includes a first porous flame arrestor unit and a Laval nozzle structure, wherein the first porous flame arrestor unit and the Laval nozzle structure are sequentially arranged upstream of the first flame arrestor cyclone.

[0012] The secondary passage component also includes a second porous flame arresting unit, which is located upstream of the second flame arresting cyclone, and together with the first porous flame arresting unit, forms a multi-stage flame arresting structure.

[0013] The first porous flame-retardant unit and the second porous flame-retardant unit are composed of metal fibers or silicon carbide porous media materials.

[0014] Optionally, the plasma discharge section further includes an insulating bushing, the central anode is connected to the central anode guide rod, and the insulating bushing is sleeved on the outside of the central anode guide rod;

[0015] The central anode has a double-conical structure, forming a flow channel that first contracts and then expands between itself and the annular grounding electrode sleeve. The narrowest part of the flow channel constitutes the discharge gap.

[0016] Optionally, the inlet end of the primary passage component is connected to a primary air inlet, and the first porous flame arrester unit is disposed at the primary air inlet to enhance the uniform flow effect of the primary airflow while arresting the flame.

[0017] The secondary passage component is connected to a secondary air inlet at its inlet end. The second porous flame arrestor unit is located at the secondary air inlet and is used to enhance the turbulence effect of the secondary airflow while blocking backfire.

[0018] Optionally, the expansion angle of the constriction section of the Laval nozzle structure is 15°-30°, and the expansion angle of the expansion section is 5°-15°, which is used to precisely control the airflow acceleration effect and form a stable velocity gradient downstream to suppress flame backpropagation.

[0019] Optionally, the inner wall of the grounding electrode sleeve is provided with a high-temperature resistant insulating coating with a coating thickness of 0.1mm-0.5mm, which is used to prevent short circuit between the central anode and the grounding electrode sleeve while improving the plasma generation stability of the discharge gap.

[0020] Optionally, the swirl angle of the first flame arrester and the second flame arrester is 30°-60°, which is used to form a stable recirculation zone at the outlet and enhance the flame residence and mixing effect.

[0021] The operation method of a low-concentration methane burner with backfire prevention applied to plasma-assisted combustion includes the following steps:

[0022] Step 1: Introduce oxidant and fuel into the primary passage assembly to form a primary mixed airflow; the primary mixed airflow flows sequentially through the first porous flame arrestor unit for flame arrest, is then accelerated by the Laval nozzle structure, and is organized into a strong swirling flow by the first flame arrestor cyclone separator;

[0023] Step 2: Introduce secondary airflow into the secondary passage assembly. The secondary airflow flows through the second porous flame arrestor unit for flame arrest and is ejected in a swirling form after passing through the second flame arrestor cyclone separator.

[0024] Step 3: A discharge is generated in the plasma discharge section downstream of the first flame arrestor cyclone, and the primary mixture is ignited by the non-equilibrium plasma in the recirculation zone formed by the strong swirling flow to form an initial flame.

[0025] Step 4: Mix the secondary airflow with the initial flame to complete the ignition and combustion process.

[0026] Optionally, in step one, the medium introduced into the primary passage component is air, low-concentration methane, or a mixture of air and low-concentration methane, wherein the volume concentration of the low-concentration methane is 2%-8%;

[0027] In steps one and two, the velocity of the primary mixed airflow is 20m / s-40m / s, and the velocity of the secondary airflow is 15m / s-30m / s. By controlling the velocity difference of the airflow, the mixing effect of the airflow is enhanced, and the combustion efficiency is improved.

[0028] Optionally, in step three, the discharge power of the plasma discharge unit is 1kW-5kW and the discharge frequency is 10kHz-50kHz, which is used to rapidly generate non-equilibrium plasma in a low-concentration methane environment to achieve reliable ignition and stable combustion.

[0029] Compared with the prior art, this application includes at least one of the following beneficial technical effects:

[0030] The invention features a highly integrated and compact structure, coaxially nesting porous media flame arrestor, swirl combustion stabilization, Laval tube acceleration, and plasma ignition to form a multi-level composite flame arrestor system. This significantly improves flame arrestor efficiency and system safety within a limited space, while reducing flow channel pressure loss.

[0031] The synergistic enhancement of flame arrest and combustion stabilization is achieved through a coaxial nested design, integrating multiple functional components such as porous flame arrestor, Laval tube acceleration, swirling combustion stabilization, and plasma ignition into a compact space. This structure forms a tiered flame arrestor sequence in the primary path, which, combined with independent flame arrestor units in the secondary path, constitutes a multi-position composite flame arrestor system. This integrated solution significantly improves flame arrest capability and system safety within a limited space, while optimizing the internal flow channels to help reduce pressure loss. The flame arrestor swirler combines flame arrest and swirling functions, effectively preventing flame dwell and component overheating and erosion, extending service life, and forming a stable backflow zone in the ignition area to improve flame dwell and combustion stabilization effects.

[0032] The upstream first flame arrestor swirler can form a stable swirling and backflow zone in front of the discharge zone, providing an ideal stationary position for the plasma-ignited flame. At the same time, the contraction structure of the discharge gap itself, combined with the acceleration effect of the upstream Laval nozzle, creates a higher airflow velocity in the critical area, effectively suppressing the flame backflow upstream; the contraction structure of the discharge gap, combined with the acceleration effect of the Laval nozzle, forms a high-speed airflow barrier in the critical area, suppressing backfire from the flow field level, achieving dual protection of ignition and backfire prevention;

[0033] The plasma discharge unit is arranged downstream of all flame arrestor structures to avoid direct impact and ablation by backfire flames; and the air intake and plasma parameters of the primary and secondary paths can be adjusted independently by adjusting the air intake and plasma parameters. The device can be flexibly applied to various combustion modes such as premixed and non-premixed, and adapt to the stable ignition requirements of different fuels. It is compatible with various combustion modes and different fuel conditions, improving the versatility and operational stability of the device.

[0034] This invention integrates multi-stage composite flame arrestor, swirling combustion stabilization, Laval tube acceleration, and plasma ignition through coaxial nesting. It has a compact structure, high flame arrest efficiency, good synergy between ignition and flow field, reliable operation, and strong adaptability to operating conditions. Attached Figure Description

[0035] Figure 1 A schematic diagram of a low-concentration methane burner with anti-backfire capability that supports plasma combustion.

[0036] Figure 2This is a schematic diagram of a microporous flow channel hydrocyclone proposed in this invention;

[0037] Figure 3 This is a schematic diagram of another structure of the microporous flow channel hydrocyclone proposed in this invention;

[0038] Figure 4 This is a schematic diagram of the porous interlocking hydrocyclone proposed in this invention;

[0039] Figure 5 This is a schematic diagram of the porous combined hydrocyclone proposed in this invention.

[0040] Reference numerals: 1. First porous flame arrestor unit; 2. Second porous flame arrestor unit; 3. Laval nozzle structure; 4. First flame arrestor cyclone; 5. Central anode; 6. Second flame arrestor cyclone; 7. Secondary air inlet sleeve; 8. Grounding electrode sleeve; 9. Insulating bushing; 10. Central anode; 11. Primary air inlet of guide rod; 12. Secondary air inlet. Detailed Implementation

[0041] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0042] Example

[0043] like Figure 1-5As shown, the plasma-assisted combustion-resistant low-concentration gas burner proposed in this invention includes a primary path assembly. The primary path assembly includes a first flame-arresting cyclone separator 4 and a plasma discharge section. The plasma discharge section is located downstream of the first flame-arresting cyclone separator 4 and includes a central anode 5 and a grounding electrode sleeve 8, which are coaxially arranged and form a discharge gap between the central anode 5 and the grounding electrode sleeve 8. The inner wall of the grounding electrode sleeve 8 is provided with a high-temperature resistant insulating coating with a coating thickness of 0.1mm-0.5mm, which is used to prevent short circuits between the central anode 5 and the grounding electrode sleeve 8 while improving the plasma generation stability of the discharge gap. The plasma discharge section also includes an insulating bushing 9. The central anode 5 is connected to the central anode guide rod 10, and the insulating bushing 9 is sleeved on the outside of the central anode guide rod 10. The central anode 5 has a double-conical structure and forms a flow channel that first contracts and then expands with the annular grounding electrode sleeve 8. The narrowest part of the flow channel constitutes a discharge gap. The discharge gap is used to generate non-equilibrium plasma to perform ignition and combustion stabilization. The flow channel contraction structure it forms also accelerates the gas, thereby forming a velocity barrier that suppresses flame backflow.

[0044] The primary path assembly also includes a first porous flame arrestor unit 1 and a Laval nozzle structure 3, which are sequentially arranged upstream of the first flame arrestor vortex 4. The expansion angle of the constriction section of the flow channel of the Laval nozzle structure 3 is 15°-30°, and the expansion angle of the expansion section is 5°-15°, which is used to precisely control the airflow acceleration effect and form a stable velocity gradient downstream to suppress flame backfire. The flow channel of the Laval nozzle structure 3 itself has a contour of first contraction and then expansion. Its acceleration effect is superimposed with the contraction structure of the discharge gap, which can form a higher airflow velocity in the key area and further enhance the backfire prevention effect.

[0045] The inlet end of the primary passage component is connected to a primary air inlet 11. The first porous flame arrestor unit 1 is disposed at the primary air inlet 11 to enhance the uniformity of the primary airflow while arresting flame. The first porous flame arrestor unit 1 is composed of porous media materials such as metal fiber or silicon carbide. It achieves backfire prevention through quenching effect. At the same time, its structural design can further improve the uniformity of the primary airflow, laying the foundation for subsequent airflow acceleration and swirling organization.

[0046] It also includes a secondary passage assembly, which includes a secondary air intake sleeve 7 and a second flame-arresting cyclone 6. The secondary air intake sleeve 7 is coaxially sleeved on the outside of the grounding electrode sleeve 8, forming an annular channel between the secondary air intake sleeve 7 and the grounding electrode sleeve 8, and the outlet end of the annular channel is provided with the second flame-arresting cyclone 6. The secondary passage assembly also includes a second porous flame-arresting unit 2, which is located upstream of the second flame-arresting cyclone 6, and together with the first porous flame-arresting unit 1, forms a multi-stage flame-arresting structure. The multi-stage flame-arresting structure, combined with the flame-arresting sequence in the primary passage and the independent flame-arresting unit in the secondary passage, constitutes a multi-position composite flame-arresting system, which significantly improves the flame-arresting capability and system safety within a limited space.

[0047] The secondary passage component is connected to a secondary air inlet 12 at its inlet end. The second porous flame arrestor unit 2 is disposed at the secondary air inlet 12 to enhance the turbulence effect of the secondary airflow while preventing backfire. The second porous flame arrestor unit 2 is made of the same material as the first porous flame arrestor unit 1, both composed of metal fiber or silicon carbide porous media material. It achieves backfire prevention through the quenching effect, and its turbulence enhancement effect can promote the full mixing of the secondary airflow and the initial flame, thereby improving the combustion-supporting effect.

[0048] The first flame-arresting cyclone 4 and the second flame-arresting cyclone 6 are respectively selected from one of the microporous flow channel type cyclone, the multi-hole interlocking type cyclone and the multi-hole combined type cyclone; the swirl angle of the first flame-arresting cyclone 4 and the second flame-arresting cyclone 6 is 30°-60°, which is used to form a stable backflow zone at the outlet and enhance flame residence and mixing.

[0049] The microporous channel type hydrocyclone is composed of multiple independent microporous channels or slits with flame-retardant capabilities and has a swirling angle.

[0050] Combination Figure 4 and Figure 5 As shown, the porous interlocking hydrocyclone is a hydrocyclone composed of porous media material filled into the flow channel of an ordinary hydrocyclone;

[0051] A porous combined hydrocyclone is a combined hydrocyclone formed by placing porous media material upstream or downstream of the hydrocyclone;

[0052] Both the multi-hole interlocking cyclone and the multi-hole combined cyclone have the functions of both a cyclone and a flame arrestor. They can prevent the flame from staying upstream of the cyclone after backfire, avoid heating the cyclone, and extend the service life of the cyclone.

[0053] In this embodiment, an operation method for the aforementioned plasma-assisted combustion-resistant low-concentration gas burner with backfire prevention is also proposed, including the following steps:

[0054] Step 1: Oxidant and fuel are introduced into the primary passage assembly to form a primary mixed gas flow. The primary mixed gas flow sequentially passes through the first porous flame arrestor unit 1 for flame arrest, and is then accelerated by the Laval nozzle structure 3, and organized into a strong swirling flow by the first flame arrestor swirler 4. The medium introduced into the primary passage assembly is air, low-concentration methane, or a mixture of air and low-concentration methane, wherein the volume concentration of low-concentration methane is 6%. The strong swirling flow organized by the first flame arrestor swirler 4 can form a stable swirling and recirculation zone before the discharge zone, providing an ideal stationary position for the flame ignited by the plasma.

[0055] Step 2: A secondary airflow is introduced into the secondary passage assembly. The secondary airflow is flame-arrested by the second porous flame-arresting unit 2 and then ejected in a swirling form after passing through the second flame-arresting swirler 6. The velocity of the primary mixed airflow is 20m / s-40m / s, and the velocity of the secondary airflow is 15m / s-30m / s. By controlling the velocity difference of the airflows, the mixing effect is enhanced, and the combustion efficiency is improved. The secondary airflow is ejected in a swirling form, which can further mix with the initial flame formed by the ignition of the primary mixed airflow, helping to stabilize the flame combustion. At the same time, the flame-arresting structure of the secondary passage can effectively prevent flame backflow and ensure the safety of the secondary passage.

[0056] Step 3: A discharge is generated in the plasma discharge section downstream of the first flame arrestor cyclone 4. The non-equilibrium plasma ignites the primary mixture within the recirculation zone formed by the strong swirling flow, creating an initial flame. The plasma discharge section has a discharge power of 1kW-5kW and a discharge frequency of 10kHz-50kHz, used to rapidly generate non-equilibrium plasma in a low-concentration methane environment, achieving reliable ignition and stable combustion. The plasma discharge unit is arranged downstream of all flame arrestor structures to avoid direct impact and ablation by backfire flames, improving the reliability and service life of the discharge section.

[0057] Step four: Mix the secondary gas flow with the initial flame to complete the ignition and combustion process. By independently adjusting the intake parameters of the primary and secondary paths and the plasma discharge parameters, the entire device can be flexibly adapted to various combustion modes such as premixed and non-premixed combustion, meeting the stable ignition requirements of different fuels and improving the adaptability and versatility of the device.

[0058] The above specific embodiments are merely optional embodiments of the present invention. Based on the technical solutions of the present invention and the relevant teachings of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

Claims

1. A plasma-assisted combustion-resistant low-concentration methane burner with backfire prevention, characterized in that, It includes a primary path assembly, which includes a first flame arrester cyclone (4) and a plasma discharge section. The plasma discharge section is located downstream of the first flame arrester cyclone (4). The plasma discharge section includes a central anode (5) and a grounding electrode sleeve (8), which are coaxially arranged, and a discharge gap is formed between the central anode (5) and the grounding electrode sleeve (8). It also includes a secondary passage assembly, which includes a secondary air intake sleeve (7) and a second flame arrestor cyclone (6). The secondary air intake sleeve (7) is coaxially sleeved on the outside of the grounding electrode sleeve (8). An annular channel is formed between the secondary air intake sleeve (7) and the grounding electrode sleeve (8), and the outlet end of the annular channel is provided with a second flame arrestor cyclone (6). The first flame-arresting cyclone (4) and the second flame-arresting cyclone (6) are respectively selected from one of the following: microporous flow channel type cyclone, multi-hole interlocking type cyclone and multi-hole combined type cyclone; The microporous channel type hydrocyclone is composed of multiple independent microporous channels or slits with swirling angles; The porous interlocking hydrocyclone is composed of porous media material filled into the flow channel of a conventional hydrocyclone. The porous composite hydrocyclone is formed by placing porous media material upstream or downstream of the hydrocyclone.

2. The plasma-assisted combustion-resistant low-concentration gas burner with backfire prevention according to claim 1, characterized in that, The primary path assembly also includes a first porous flame arrestor unit (1) and a Laval nozzle structure (3), which are sequentially arranged upstream of the first flame arrestor vortex (4). The secondary passage component also includes a second porous fire-arresting unit (2), which is located upstream of the second fire-arresting vortex (6) and together with the first porous fire-arresting unit (1) forms a multi-stage fire-arresting structure. The first porous fire-resistant unit (1) and the second porous fire-resistant unit (2) are composed of metal fibers or silicon carbide porous media materials.

3. The plasma-assisted combustion-resistant low-concentration gas burner with backfire prevention according to claim 1, characterized in that, The plasma discharge section also includes an insulating bushing (9), the central anode (5) is connected to the central anode guide rod (10), and the insulating bushing (9) is sleeved on the outside of the central anode guide rod (10); The central anode (5) has a double conical structure and forms a flow channel that first contracts and then expands between it and the annular grounding electrode sleeve (8). The narrowest part of the flow channel constitutes a discharge gap.

4. The plasma-assisted combustion-resistant low-concentration gas burner with backfire prevention according to claim 2, characterized in that, The inlet end of the primary passage component is connected to a primary air inlet (11), and the first porous flame arrester unit (1) is set at the primary air inlet (11) to enhance the uniform flow effect of the primary airflow while arresting the flame. The inlet end of the secondary passage component is connected to a secondary air inlet (12), and the second porous flame arrestor unit (2) is set at the secondary air inlet (12) to enhance the turbulence effect of the secondary airflow while blocking backfire.

5. The plasma-assisted combustion-resistant low-concentration gas burner with backfire prevention according to claim 4, characterized in that, The expansion angle of the constriction section of the Laval nozzle structure (3) is 15°-30°, and the expansion angle of the expansion section is 5°-15°, which is used to precisely control the airflow acceleration effect and form a stable velocity gradient downstream to suppress flame back propagation.

6. The plasma-assisted combustion-resistant low-concentration gas burner with backfire prevention according to claim 1, characterized in that, The inner wall of the grounding electrode sleeve (8) is provided with a high-temperature resistant insulating coating with a thickness of 0.1mm-0.5mm, which is used to prevent the central anode (5) from short-circuiting with the grounding electrode sleeve (8) while improving the plasma generation stability of the discharge gap.

7. The plasma-assisted combustion-resistant low-concentration gas burner with backfire prevention according to claim 1, characterized in that, The first flame arrester (4) and the second flame arrester (6) have a swirl angle of 30°-60°, which are used to form a stable reflux zone at the outlet and enhance the flame residence and mixing effect.

8. An operating method for a plasma-assisted combustion-resistant low-concentration methane burner according to any one of claims 1-7, characterized in that, Includes the following steps: Step 1: Introduce oxidant and fuel into the primary passage assembly to form a primary mixed airflow; the primary mixed airflow flows through the first porous flame arrestor unit (1) for flame arrest, and is then accelerated by the Laval nozzle structure (3), and organized into a strong swirling flow by the first flame arrestor vortex generator (4); Step 2: Introduce secondary airflow into the secondary passage assembly. The secondary airflow flows through the second porous flame arrestor unit (2) for flame arrest and then passes through the second flame arrestor vortex generator (6) before being ejected in a vortex form. Step 3: A discharge is generated in the plasma discharge section downstream of the first flame arrestor cyclone (4), and the primary mixture is ignited in the recirculation zone formed by the strong swirling flow using the non-equilibrium plasma to form an initial flame; Step 4: Mix the secondary airflow with the initial flame to complete the ignition and combustion process.

9. The operation method of the plasma-assisted combustion-preventing low-concentration gas burner according to claim 8, characterized in that, In step one, the medium introduced into the primary passage component is air, low-concentration methane, or a mixture of air and low-concentration methane, wherein the volume concentration of the low-concentration methane is 2%-8%; In steps one and two, the velocity of the primary mixed airflow is 20m / s-40m / s, and the velocity of the secondary airflow is 15m / s-30m / s. By controlling the velocity difference of the airflow, the mixing effect of the airflow is enhanced, and the combustion efficiency is improved.

10. The operation method of the plasma-assisted combustion-preventing low-concentration gas burner according to claim 8, characterized in that, In step three, the discharge power of the plasma discharge unit is 1kW-5kW and the discharge frequency is 10kHz-50kHz, which is used to rapidly generate non-equilibrium plasma in a low-concentration methane environment to achieve reliable ignition and stable combustion.

Images