CN218820384U

CN218820384U - Combustion equipment

Info

Publication number: CN218820384U
Application number: CN202222321933.3U
Authority: CN
Inventors: 薛浩栋; 金晓宇; 沈彦孜
Original assignee: Wuhu Jingsu Industrial Co ltd
Current assignee: Wuhu Jingsu Industrial Co ltd
Priority date: 2022-09-01
Filing date: 2022-09-01
Publication date: 2023-04-07
Anticipated expiration: 2032-09-01

Abstract

The utility model belongs to the technical field of gas and air combustion's combustion apparatus. The cloth hole inner container (21) of the combustion equipment is internally provided with a baffle (212), the diameter of the end face of one end, close to the gas pipeline (1), of the baffle (212) is smaller than the diameter of the end face of one end, far away from the gas pipeline (1), of the end face of one end of the baffle (212), the baffle (212) is provided with a through connecting rod (213), each end of the connecting rod (213) is fixedly connected with the inner wall of the cloth hole inner container (211) respectively, and the connecting rod (213) and the baffle (212) are fixedly connected with each otherAnd in connection, a wave corrugated surface is arranged on the end surface of one end of the baffle plate (212) far away from the gas pipeline (1). Combustion equipment, effectively play fractional combustion and thick and thin burning effect when gas combustion, the regional temperature field of even combustion distributes, constructs low-speed backward flow district, guarantees that fuel is stable, burns fully, has reduced NO _X The emission reduces environmental pollution, promotes environmental protection effect, promotes combustion apparatus performance.

Description

Combustion equipment

Technical Field

The utility model belongs to the technical field of gas and air combustion, more specifically says, relates to a combustion apparatus.

Background

Fuel gas (fuel gas) is mixed with air and then combusted, and oxygen in the air and hydrocarbons in the fuel gas undergo a combustion reaction to release a large amount of heat, but when combusted at a high temperature and under an excess of oxygen, NO polluting the atmosphere is generated _X And, under otherwise identical conditions, NO _X The amount of production of (c) increases with an increase in the combustion temperature. To inhibit NO _X The emission of (2) is needed to realize NO on the basis of ensuring efficient combustion _X And (4) emission reduction. However, the combustion devices manufactured by the combustion technology in the prior art generally have the problems of insufficient mixing of fuel and air, uneven air flow distribution, excessive or too small local flame and the like, so that NO is caused _X The discharge amount is high, and meanwhile, potential safety hazards exist. Therefore, the use requirements cannot be effectively satisfied.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that: aiming at the defects of the prior art, the utility model provides a simple structure, effectively plays the roles of staged combustion and thick and thin combustion during the combustion of fuel gas, distributes the temperature field of a uniform combustion area, constructs a low-speed backflow area, ensures the stable and sufficient combustion of fuel, and reduces NO _X The discharge amount is reduced, the environmental pollution is reduced, and the environmental protection effect is improved.

To solve the technical problem, the utility model discloses the technical scheme who takes does:

the utility model relates to a combustion apparatus, including the gas pipeline, the gas pipeline is connected with the closing plate of air conduit front end, the inside cloth downthehole inner bag that sets up of air conduit, the one end that cloth downthehole inner bag terminal surface diameter is little is connected on the closing plate, the gas pipeline extends to in the cloth downthehole inner bag, set up the baffle in the cloth downthehole inner bag, the baffle is close to gas pipeline one end terminal surface diameter and is less than and keeps away from gas pipeline one end terminal surface diameter, run through the connecting rod on the baffle, every end of connecting rod respectively with cloth downthehole inner bag inner wall fixed connection, fixed connection between connecting rod and the baffle, the gas pipeline one end terminal surface is kept away from to the baffle sets up wave fold face, wave fold face comprises a plurality of fold archs and a plurality of fold recesses, form the fold recess between two adjacent fold archs.

The cloth hole inner container is of a horn mouth-shaped structure, and the baffle is of a horn mouth-shaped structure.

The hole distribution inner container is provided with a plurality of groups of filter hole groups from one end with small end surface diameter to one end with large end surface diameter, and each group of filter hole groups is provided with a plurality of filter holes according to gaps along the circumference of the hole distribution inner container.

The filter hole group comprises a first filter hole group, a second filter hole group, a third filter hole group, a fourth filter hole group and a fifth filter hole group, and the position of the plane where the end face of one end, close to the gas pipeline, of the baffle is located with the circle center of the third filter hole group is consistent.

And a channel is formed between one end of the baffle, which is far away from the gas pipeline, and the cloth hole inner container.

The side surface of the air pipeline is provided with an air flow channel, and the rear end of the air pipeline is connected with the cover barrel.

And the end of each end of the connecting rod is fixedly connected with the inner wall of the cloth hole liner in a welding mode, and the connecting rod is fixedly connected with the baffle in a welding mode.

The fold bulges on the baffle are of a convex semicircular structure.

The gas pipeline inside form central flow path, central flow path includes inlet section and export section, and the inlet section is a section of runner that the cross-sectional area is unanimous, and the cross-sectional area of export section reduces gradually and forms the shrink runner, and the boss a week of shrink runner sets up a plurality of gas orifice according to the clearance.

The combustion equipment further comprises an ignition system, the ignition system is a high-voltage electric spark ignition device and comprises a high-voltage ignition pack, an ignition lead and an ignition needle, the high-voltage ignition pack is arranged outside the sealing plate of the air pipeline and is connected with the ignition needle through the lead, and the ignition needle penetrates through the gas pipeline and the baffle and extends into the cloth hole inner container.

Adopt the technical scheme of the utility model, theory of operation and beneficial effect are as follows:

combustion apparatus, when using, the gas circulation process is: the gas enters the gas pipeline through the gas inlet, flows to the boss of the contraction flow channel of the outlet section along the air flow channel, is accelerated by the contraction flow channel, is sprayed out from the tail gas spray hole, enters the hole distribution liner in the cylindrical pipeline, is sprayed into the cover barrel through the baffle, and forms a low-speed backflow area behind the baffle. The air circulation process is as follows: air enters an air flow channel with a rectangular structure from an air inlet, flows into a cylindrical pipeline and is classified through a hole distribution inner container, part of the air entering the hole distribution inner container through filter holes (from a first filter hole group to a fifth filter hole group) is firstly mixed with dense fuel gas at the front end of a baffle plate and then flows to the rear part of the hole distribution inner container around a glancing baffle plate, and the other part of the air is mixed with the dilute fuel gas flowing to the rear part of the hole distribution inner container from the inside of the hole distribution inner container after flowing around the outer surface of the hole distribution inner container to form stable dense and dilute combustion, so that a low-temperature combustion area is constructed. In the device of the utility model, the gas is accelerated by the contraction flow channel to flow through the baffle at a certain angle, the airflow is dispersed by the appearance of the baffle, the airflow is rotated at a certain angle by the fold groove and the fold protrusion to form a small-amplitude rotational flow, weak negative pressure is generated to slow down the flow rate of the gas, the entrainment oxygen generates backflow, and a low-speed backflow area is formed at the rear end of the baffle; due to the obstruction of the baffle, the fuel from the fuel gas spray holes to the front end area of the baffle is over-rich to form an oxygen-poor combustion atmosphere, the fuel concentration of the rear end area of the baffle is reduced, and a stable thick-thin combustion area is formed at the rear part of the hole distribution liner. On one hand, the rotational flow can slow down the gas jet speed, and the generated negative pressure entrainment airflow forms a backflow area, so that the average temperature of the area is reduced while the stable flame flow condition is met; on the other hand, the high-concentration fuel side is incompletely combusted, and incompletely combusted fuel gas is slowly diffused to the low-concentration fuel side to completely react, so that the uniformity of a temperature field is further improved, the stable combustion is ensured, and the NO is reduced at the same time _X And (4) discharging the amount. The trumpet-shaped surface of the cloth hole liner further changes the air flow direction, a micro backflow area is formed at the tail end, the flow field is stabilized, the fuel is promoted to be fully and stably combusted, and NO is further inhibited _X The amount of production. Combustion equipment, simple structure, only need local improvement, it is with low costs, effectively solve fuel and air mixing and do not fillThe problems of uneven distribution of the branch and air flow, overlarge or undersize local flame and the like are solved, the effects of staged combustion and thick-thin combustion are effectively achieved during gas combustion, the temperature field distribution of a uniform combustion area and the construction of a low-speed backflow area ensure that fuel is stably and fully combusted, and NO is reduced _X The emission reduces environmental pollution, promotes environmental protection effect, promotes combustion apparatus performance.

Drawings

The contents of the specification, as well as the references used in the drawings, will now be briefly described as follows:

fig. 1 is a schematic sectional structural view of a combustion apparatus according to the present invention;

fig. 2 is a schematic side view of the combustion apparatus according to the present invention;

fig. 3 is a schematic structural view of a baffle plate of the combustion device according to the present invention;

in the drawings, the symbols are respectively: the gas pipeline comprises a gas pipeline 1, a boss 11, a gas spray hole 111, a central flow channel 12, a gas inlet 13, an air pipeline 2, a cylindrical pipeline 21, a hole distribution liner 211, a first filter hole 2111, a second filter hole 2112, a third filter hole 2113, a fourth filter hole 2114, a fifth filter hole 2115, a baffle 212, a corrugated groove 2121, a corrugated protrusion 2122, a connecting rod 213, an air flow channel 22, an air inlet 23, a channel 24, a cover barrel 3, an ignition system 4, an ignition needle 41, a lead wire 42 and a high-pressure ignition package 43.

Detailed Description

The following description of the embodiments of the present invention will be made in detail with reference to the accompanying drawings, wherein the embodiments of the present invention are described in detail with reference to the accompanying drawings, for example, the shapes, structures, mutual positions and connection relations of the components, the functions and operation principles of the components, and the like:

as shown in the attached drawings 1-3, the utility model relates to a combustion equipment, including gas pipeline 1, gas pipeline 1 is connected with the closed plate of 2 front ends of air duct, and 2 inside cloth hole inner bags 211 that set up of air duct, the one end that cloth hole inner bags 211 end face diameter is little is connected on the closed plate, and in gas pipeline 1 extended to cloth hole inner bags 211, set up baffle 212 in cloth hole inner bags 211, baffle 212 was less than near 1 one end face diameter of gas pipelineKeep away from gas pipeline 1 one end terminal surface diameter, run through connecting rod 213 on the baffle 212, connecting rod 213 each end respectively with cloth hole inner bag 211 inner wall fixed connection, fixed connection between connecting rod 213 and the baffle 212, the baffle 212 keeps away from gas pipeline 1 one end terminal surface and sets up the wave fold face, the wave fold face comprises a plurality of fold protrudingly 2122 and a plurality of fold recess 2121, forms fold recess 2121 between two adjacent fold protrudingly 2122. The structure provides an improved technical scheme aiming at the defects in the prior art. The utility model discloses a combustion apparatus is when using, and the gas circulation process is: the gas enters the gas pipeline 1 through the gas inlet 13, flows to the boss 11 of the contraction flow channel of the outlet section along the air flow channel 12, is accelerated by the contraction flow channel, is sprayed out from the gas spray hole 111 at the tail end, enters the cloth hole inner container 211 in the cylindrical pipeline 21, is sprayed into the cover barrel 3 through the baffle 212, and forms a low-speed backflow area behind the baffle 212. The air circulation process comprises the following steps: air enters the air flow channel 22 with a rectangular structure from the air inlet 23, flows into the cylindrical pipeline 21 and is classified through the hole distribution inner container 211, a part of air enters the hole distribution inner container 211 through the filtering holes (the first filtering hole group 2111 to the fifth filtering hole group 2115) to be mixed with dense gas at the front end of the baffle 212 and then flows to the rear part of the hole distribution inner container around the baffle 212, and the other part of air flows to be mixed with the light gas flowing to the rear part of the hole distribution inner container from the inside of the hole distribution inner container after flowing around the outer surface of the hole distribution inner container 211 to form stable dense-light combustion, so that a low-temperature combustion area is constructed. In the device of the utility model, the gas is accelerated by the contraction flow channel to flow through the baffle 212 at a certain angle, the airflow is dispersed by the appearance of the baffle 212, the airflow is rotated at a certain angle by the fold groove 2121 and the fold bulge 2122 to form a small-amplitude rotational flow, weak negative pressure is generated to slow down the flow rate of the gas, the entrainment oxygen generates backflow, and a low-speed backflow area is formed at the rear end of the baffle 212; due to the obstruction of the baffle plate 212, the fuel from the gas injection holes 111 to the front end region of the baffle plate 212 is excessively rich to form an oxygen-poor combustion atmosphere, the fuel concentration at the rear end region of the baffle plate 211 is reduced, and a stable rich-lean combustion region is formed at the rear part of the hole distribution liner. On one hand, the rotational flow can slow down the gas jet speed, and the generated negative pressure entrainment airflow forms a backflow area, so that the average temperature of the area is reduced while the stable flame flow condition is met; in additionOn one hand, the high-concentration fuel side is incompletely combusted, and the incompletely combusted fuel gas is slowly diffused to the low-concentration fuel side to completely react, so that the uniformity of a temperature field is further improved, the stable combustion is ensured, and the NO is reduced at the same time _X And (4) discharging the amount. The trumpet-shaped surface of the cloth hole inner container 211 further changes the air flow direction, a tiny backflow area is formed at the tail end to stabilize the flow field, fuel is promoted to be fully and stably combusted, and NO is further inhibited _X The amount of production. Combustion equipment, simple structure, only need local improvement, it is with low costs, effectively solve fuel and air mixing insufficient, air current uneven distribution, local flame too big or undersize scheduling problem, effectively play fractional combustion and thick and thin burning effect when gas combustion, even burning area temperature field distribution, structure low-speed backward flow district guarantee that fuel is stable, fully burn, reduced NO _X The emission reduces environmental pollution, promotes environmental protection effect, promotes combustion apparatus performance.

The hole distribution inner container 211 is provided with a plurality of groups of filter hole groups from one end with small end surface diameter to one end with large end surface diameter, and each group of filter hole groups is provided with a plurality of filter holes according to gaps along the circumference of the hole distribution inner container 211. The filter hole group comprises a first filter hole group 2111, a second filter hole group 2112, a third filter hole group 2113, a fourth filter hole group 2114 and a fifth filter hole group 2115, and the plane position of the baffle 212 close to one end face of the gas pipeline 1 and the position of the center of a hole of the third filter hole group 2113 are consistent. In the structure, the hole distribution liner 211 is provided with the first to fifth filter hole groups (2111-2115) along the axial direction, part of air in the cylindrical pipeline 21 of the air pipeline enters the hole distribution liner 211 through the filter holes to form a primary combustion area to construct an oxidizing atmosphere, the other part of air winds the outer surface of the hole distribution liner 211 and is subjected to secondary combustion at the tail of the hole distribution liner to form a reducing atmosphere, the mixing degree of the air and the fuel is enhanced, meanwhile, a local high-temperature area generated in the combustion process is weakened, and NO is inhibited _X And (4) generating.

The cloth hole inner container 211 is of a bell mouth-shaped structure, and the baffle 212 is of a bell mouth-shaped structure. In the above structure, when the specific structure is provided, the diameter of the front end face of the baffle 212 is set to be smaller than that of the end face of the baffle 212, so that the formed circular truncated cone peripheral surface causes flow separation when the fluid flows through the boundary of the baffle 212, and a wide wake flow is generated at the rear part, and a periodic or aperiodic vortex shedding phenomenon is accompanied. Thus, the baffle 212 can act as a deceleration where the fluid passing through the baffle 212 creates a low velocity recirculation zone at its end, which is too rich in fuel.

The end of the baffle plate 212 far away from the gas pipeline 1 and the hole distribution inner container 211 form a channel 24. The air passing through the outer surface of the cloth hole inner container reaches the rear position of the cloth hole inner container through the channel.

An air flow passage 22 is arranged on the side surface of the air pipeline 2, and the rear end of the air pipeline 2 is connected with the cover barrel 3. The cover barrel 3 is a cylindrical pipeline with two ends not closed, and the front end is connected with the tail end of the air pipeline 2. The end of each end of the connecting rod 213 is fixedly connected with the inner wall of the cloth hole inner container 211 in a welding mode, and the connecting rod 213 is fixedly connected with the baffle 212 in a welding mode.

The corrugated protrusions 2122 on the baffle 212 are in a convex semicircular structure. According to the structure, the corrugated structure is formed by the corrugated bulges and the corrugated grooves, so that the gas forms a small-amplitude rotational flow at the position, weak negative pressure is generated to slow down the flow rate of the gas and suck the mixed gas, and a stable backflow area with excessively thin fuel is formed behind the baffle 212. The gas pipeline 1 is internally provided with a central flow passage 12, the central flow passage 12 comprises an inlet section and an outlet section, the inlet section is a flow passage with a consistent cross section area, the cross section area of the outlet section is gradually reduced to form a contraction flow passage, and a plurality of gas jet holes 111 are arranged on the circumference of a boss 11 of the contraction flow passage according to gaps. In the structure, the gas jet holes are of a porous structure, and the plurality of gas jet holes are arranged along the circumference, so that the mixing time of fuel and air can be reduced, flame can be divided, the influence of a local high-temperature area is weakened, and thermal NO is inhibited _X And (4) generating.

The combustion equipment further comprises an ignition system 4, the ignition system 4 is a high-voltage electric spark ignition device, the ignition system 4 comprises a high-voltage ignition bag 43, an ignition lead 42 and an ignition needle 41, the high-voltage ignition bag 43 is arranged outside a sealing plate of the air pipeline 2, the high-voltage ignition bag 43 is connected with the ignition needle 41 through the lead 42, and the ignition needle penetrates through the gas pipeline 1 and the baffle 212 and extends into the hole distribution inner container 211. With the above structure, the ignition system is used for igniting the gas as required.

The utility model discloses a combustion apparatus sets up on the baffle and is wave fold form, and the separation that flows can form when the air current flows through this position of baffle, and fold arch and fold recess make near gas orifice air current rotatory, constitute low-speed backward flow district with steady flow field, and backward flow district fuel concentration is higher than other regions under the baffle separation effect, reduces the regional average temperature of burning through dense and light combustion, effective control heating power type NO _X And (4) discharging the amount. The utility model discloses a structural design on structure dependence cloth downthehole courage and baffle surface utilizes local resistance to change and changes the air current velocity of flow and flow direction, constructs low temperature backward flow district, guarantees that combustion area air and fuel reaction are more abundant, stable, restraines NO _X The combustion efficiency and the degree of stability are improved. Therefore, the problems of the prior art can be effectively overcome.

Combustion apparatus, when using, the gas circulation process is: the gas enters the gas pipeline through the gas inlet, flows to the boss of the contraction flow channel of the outlet section along the air flow channel, is accelerated by the contraction flow channel, is sprayed out from the tail gas spray hole, enters the hole distribution liner in the cylindrical pipeline, is sprayed into the cover barrel through the baffle, and forms a low-speed backflow area behind the baffle. The air circulation process is as follows: air enters an air flow channel with a rectangular structure from an air inlet, flows into a cylindrical pipeline and is classified through a hole distribution inner container, part of the air entering the hole distribution inner container through filter holes (from a first filter hole group to a fifth filter hole group) is firstly mixed with dense fuel gas at the front end of a baffle plate and then flows to the rear part of the hole distribution inner container around a glancing baffle plate, and the other part of the air is mixed with the dilute fuel gas flowing to the rear part of the hole distribution inner container from the inside of the hole distribution inner container after flowing around the outer surface of the hole distribution inner container to form stable dense and dilute combustion, so that a low-temperature combustion area is constructed. In the device of the utility model, the gas is accelerated by the contraction flow channel to flow through the baffle plate at a certain angle, the airflow is dispersed by the appearance of the baffle plate, the fold groove and the fold bulge enable the airflow to rotate at a certain angle, a small-amplitude rotational flow is formed, weak negative pressure is generated to slow down the flow rate of the gas, the entrainment oxygen generates backflow, and a low-speed backflow area is formed at the rear end of the baffle plate; due to the obstruction of the baffle plate, the fuel gas sprays the hole to the front of the baffle plateThe fuel in the end area is over-rich to form an oxygen-poor combustion atmosphere, the fuel concentration in the rear end area of the baffle plate is reduced, and a stable rich-lean combustion area is formed at the rear part of the cloth hole inner container. On one hand, the rotational flow can slow down the gas injection speed, and the generated negative pressure entrainment airflow forms a backflow area, so that the average temperature of the area is reduced while the stable flowing condition of flame is met; on the other hand, the high-concentration fuel side is not completely combusted, and the incompletely combusted fuel gas is slowly diffused to the low-concentration fuel side to be completely reacted, so that the uniformity of a temperature field is further improved, the combustion stability is ensured, and the NO is reduced at the same time _X And (4) discharging the amount. The trumpet-shaped surface of the cloth hole liner further changes the air flow direction, a micro backflow area is formed at the tail end, the flow field is stabilized, the fuel is promoted to be fully and stably combusted, and NO is further inhibited _X The amount of production. Combustion equipment, simple structure, only need local improvement, it is with low costs, effectively solve fuel and air mixing insufficient, air current uneven distribution, local flame too big or undersize scheduling problem, effectively play fractional combustion and thick and thin burning effect when gas combustion, even burning area temperature field distribution, structure low-speed backward flow district guarantee that fuel is stable, fully burn, reduced NO _X The emission reduces environmental pollution, promotes environmental protection effect, promotes combustion apparatus performance.

The present invention has been described in detail with reference to the accompanying drawings, and it is obvious that the present invention is not limited by the above embodiments, and the present invention can be implemented in various ways without modification, and the present invention is not limited by the above embodiments.

Claims

1. A combustion apparatus, characterized by: including gas pipeline (1), gas pipeline (1) is connected with the closing plate of air pipe (2) front end, inside cloth hole inner bag (211) that sets up of air pipe (2), the one end that cloth hole inner bag (211) terminal surface diameter is little is connected on the closing plate, gas pipeline (1) extends to in cloth hole inner bag (211), set up baffle (212) in cloth hole inner bag (211), baffle (212) are close to gas pipeline (1) one end terminal surface diameter and are less than keeping away from gas pipeline (1) one end terminal surface diameter, run through connecting rod (213) on baffle (212), every end of connecting rod (213) respectively with cloth hole inner bag (211) inner wall fixed connection, fixed connection between connecting rod (213) and baffle (212), baffle (212) keep away from gas pipeline (1) one end terminal surface and set up the wave fold face, the wave fold face comprises a plurality of fold protrudingly (2122) and a plurality of fold recess (2121), form recess fold (2121) between two adjacent protruding fold (2122).

2. The combustion apparatus of claim 1, wherein: the cloth hole inner container (211) is of a bell mouth-shaped structure, and the baffle (212) is of a bell mouth-shaped structure.

3. The combustion apparatus according to claim 1 or 2, wherein: the hole distribution inner container (211) is provided with a plurality of groups of filter hole groups from one end with small end surface diameter to one end with large end surface diameter, and each group of filter hole groups is provided with a plurality of filter holes according to gaps along the circumference of the hole distribution inner container (211).

4. The combustion apparatus as claimed in claim 3, wherein: the filter hole group comprises a first filter hole group (2111), a second filter hole group (2112), a third filter hole group (2113), a fourth filter hole group (2114) and a fifth filter hole group (2115), and the position of the plane where the end face of one end of the baffle (212) close to the gas pipeline (1) and the circle center of a hole of the third filter hole group (2113) are located is consistent.

5. The combustion apparatus as claimed in claim 1 or 2, wherein: a channel (24) is formed between one end of the baffle (212) far away from the gas pipeline (1) and the cloth hole inner container (211).

6. The combustion apparatus according to claim 1 or 2, wherein: an air flow channel (22) is arranged on the side surface of the air pipeline (2), and the rear end of the air pipeline (2) is connected with the cover barrel (3).

7. The combustion apparatus as claimed in claim 1 or 2, wherein: the end of each end of the connecting rod (213) is fixedly connected with the inner wall of the cloth hole inner container (211) in a welding mode, and the connecting rod (213) is fixedly connected with the baffle (212) in a welding mode.

8. The combustion apparatus as claimed in claim 1 or 2, wherein: the fold bulges (2122) on the baffle plate (212) are of a convex semicircular structure.

9. The combustion apparatus as claimed in claim 1 or 2, wherein: the gas pipeline (1) inside form central channel (12), central channel (12) include inlet section and export section, the inlet section is a section of runner that the cross-sectional area is unanimous, the cross-sectional area of export section reduces gradually and forms the shrink runner, boss (11) a week of shrink runner sets up a plurality of gas orifice (111) according to the clearance.

10. The combustion apparatus as claimed in claim 1 or 2, wherein: the combustion apparatus still include ignition system (4), ignition system (4) are high-pressure spark ignition, ignition system (4) are including high-pressure ignition package (43), ignition lead (42), ignition needle (41), high-pressure ignition package (43) set up outside the closing plate of air conduit (2), high-pressure ignition package (43) link to each other with ignition needle (41) through lead (42), the ignition needle passes in gas pipeline (1) and baffle (212) extend to cloth downthehole courage (211).