Multi-channel low-pressure gas burner

Abstract

The utility model discloses a multi-channel low-pressure gas burner. The multi-channel low-pressure gas burner aims to solve the problems that an existing gas burner is low in burning efficiency, high in pollutant emission and insufficient in safety. The device comprises a shell and an ignition device, the shell is internally provided with a gas channel communicated with a gas inlet, an air channel A and an air channel, the air channel A and the air channel B are communicated with an air inlet, and a gas channel B is located between the air channel A and an air channel C; the double-channel design is adopted for air, coal gas enters the combustor to be subjected to staged combustion, primary combustion is oxygen-deficient combustion, the flame temperature is low, the stability of coal gas combustion is remarkably improved, the combustion efficiency is improved, meanwhile, emission of nitric oxide is reduced, and the environment-friendly requirement is better met; the rotational flow design of the secondary air delays the diffusion speed of the coal gas, the central direct flow design of the primary air enhances the penetrating power, and long and stable flames are formed through the combined action.

Description

Technical Field

[0001] This application relates to the field of burner technology, specifically to a multi-channel low-pressure gas burner. Background Technology

[0002] Traditional gas burners (torch nozzles) typically employ a single-channel or dual-channel structure, which has the following main drawbacks:

[0003] (1) Low combustion efficiency: The gas and air are not mixed evenly before combustion, resulting in incomplete combustion and low combustion efficiency;

[0004] (2) High pollutant emissions: Due to incomplete combustion, high concentrations of pollutants such as carbon monoxide (CO) and nitrogen oxides (NOx) are produced during the combustion process;

[0005] (3) Insufficient safety: When gas comes into direct contact with a high-temperature environment, backfire is likely to occur, posing a significant safety hazard.

[0006] Taking a common coaxial gas burner (flame burner) as an example, its structure consists of two concentric sleeves. Gas flows out from the inner sleeve, and air flows out from the outer sleeve. The gas and air flow in parallel, resulting in a slow mixing speed and a long flame burner. While this structure is simple and offers low gas flow resistance, it makes it difficult to adjust the gas flow path and flame length, thus failing to meet the combustion requirements under different operating conditions. Furthermore, it suffers from generally low combustion efficiency, high nitrogen oxide content, and a risk of backfire. Utility Model Content

[0007] Therefore, this application provides a multi-channel low-pressure gas burner to solve the problems of low combustion efficiency and high pollutant emissions in existing gas burners.

[0008] To achieve the above objectives, this application provides the following technical solution:

[0009] A multi-channel low-pressure gas burner includes a shell and an ignition device. The side walls of the shell are respectively provided with a gas inlet and an air inlet. The interior of the shell is provided with a gas channel B communicating with the gas inlet and air channels A and C communicating with the air inlet. The gas channel B is located between air channels A and C. The front end of the interior of the shell is a combustion zone. The ignition device ignites the mixed gas in the combustion zone through a high-voltage electric spark to realize the combustion process.

[0010] Optionally, the outer shell has a cylindrical hollow structure, and a first annular partition and a second annular partition are arranged at intervals from the inside to the outside. The inlet ends of the first annular partition and the second annular partition are provided with connecting plates corresponding to the gas inlet.

[0011] The space between the inner wall of the first annular partition and the central axis of the outer shell constitutes the air passage A, the space between the outer wall of the first annular partition and the inner wall of the second annular partition constitutes the gas passage B, and the space between the outer wall of the second annular partition and the inner wall of the outer shell constitutes the air passage C.

[0012] Optionally, the length of the first annular partition is less than the length of the second annular partition, such that the front end of the first annular partition, the front end of the second annular partition, and the front end of the outer shell together form a stepped structure.

[0013] Optionally, the outlet end of the gas channel B is provided with a channel B swirl vane, the outlet end of the air channel A is provided with a channel A swirl vane, and the outlet end of the air channel C is provided with a channel C swirl vane.

[0014] Optionally, the swirl vane in channel B is oriented in the opposite direction to the swirl vanes in channels A and C.

[0015] Optionally, a flame detection device is also provided on the outside of the housing for real-time monitoring of the flame status.

[0016] Compared with the prior art, this application has at least the following beneficial effects:

[0017] 1. Based on further analysis and research of existing technical problems, this application provides a multi-channel low-pressure gas burner. The internal casing is equipped with a gas channel communicating with the gas inlet and an air channel A communicating with the air inlet. Gas channel B is located between air channels A and C. This application employs a dual-channel air design, allowing the gas to enter the burner for staged combustion. The primary combustion is anaerobic combustion, resulting in a low flame temperature, significantly enhancing the stability of gas combustion, improving combustion efficiency, and reducing nitrogen oxide emissions, thus better meeting environmental protection requirements. The stratified flow of air-gas-air overcomes the limitations of traditional... The dual-channel mixing mode features a swirling secondary air design that slows down gas diffusion, while a central direct-flow primary air design enhances penetration, working together to form a long and stable flame. The multi-channel design allows for targeted selection of different primary and secondary air ratios based on varying operating conditions, and by adjusting the cross-sectional area of ​​the channels, more ideal results can be achieved to meet diverse combustion needs. Through air isolation and flow equalization structures, air and gas are ensured to be evenly distributed before entering the combustion zone, achieving inherent safety and explosion-proof properties, reducing safety hazards during burner operation, and improving the safety and reliability of the equipment.

[0018] 2. The media in the three channels of this application are air, coal gas and air from the inside out. Each channel is equipped with channel swirl vanes, and the swirl vanes in the coal gas channel are in the opposite direction to those in the air channel. This design can make the mixing of coal gas and air more uniform, further improve combustion efficiency, reduce unburned gas, and reduce pollutant emissions. Attached Figure Description

[0019] To more intuitively illustrate the prior art and this application, exemplary drawings are provided below. It should be understood that the specific shapes and structures shown in the drawings should not generally be regarded as limiting conditions for implementing this application; for example, based on the technical concept disclosed in this application and the exemplary drawings, those skilled in the art are able to easily make conventional adjustments or further optimizations to the addition / reduction / classification, specific shapes, positional relationships, connection methods, size ratios, etc. of certain units (components).

[0020] Figure 1 This is a schematic diagram of the structure of a multi-channel low-pressure gas burner provided in one embodiment of this application.

[0021] Explanation of reference numerals in the attached figures:

[0022] 1. Outer shell; 101. Gas inlet; 102. Air inlet; 2. First annular baffle; 3. Second annular baffle; 4. Gas passage B; 5. Air passage A; 6. Air passage C; 7. Swirl vane of passage B; 8. Swirl vane of passage A; 9. Swirl vane of passage C; 10. Ignition device; 11. Flame detection device; 12. Combustion zone; 13. Connecting plate. Detailed Implementation

[0023] The present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] In the description of this application: unless otherwise stated, "a plurality of" means two or more. The terms "first," "second," "third," etc., in this application are intended to distinguish the objects referred to and do not have any special meaning in terms of technical connotation (e.g., they should not be construed as an emphasis on importance or order). Expressions such as "comprising," "including," and "having" also mean "not limited to" (certain units, components, materials, steps, etc.).

[0025] The terms used in this application, such as "upper," "lower," "left," "right," and "middle," are generally used to indicate the general relative positional relationship for the purpose of intuitive understanding by referring to the accompanying drawings, and are not absolute limitations on the positional relationship in the actual product.

[0026] One embodiment of this application, such as Figure 1As shown, a multi-channel low-pressure gas burner includes a shell 1 and an ignition device 10. The side walls of the shell 1 are respectively provided with a gas inlet 101 and an air inlet 102. The interior of the shell 1 is provided with a gas channel B4 communicating with the gas inlet 101 and an air channel A5 and an air channel C6 communicating with the air inlet 102. The gas channel B4 is located between the air channel A5 and the air channel C6.

[0027] The front end of the inner casing 1 is the combustion zone 12. The ignition device 10 ignites the mixed gas in the combustion zone 12 by a high-voltage electric spark to realize the combustion process.

[0028] Preferably, the outer shell 1 has a cylindrical hollow structure, and a first annular partition 2 and a second annular partition 3 are arranged from the inside to the outside. The gas inlet 101 is connected to the first annular partition 2 and the second annular partition 3, and a connecting plate 13 is provided at the inlet end of the first annular partition 2 and the second annular partition 3 corresponding to the position of the gas inlet 101.

[0029] The space between the inner wall of the first annular partition 2 and the central axis of the outer shell 1 forms an air passage A5, the space between the outer wall of the first annular partition 2 and the inner wall of the second annular partition 3 forms a gas passage B4, and the space between the outer wall of the second annular partition 3 and the inner wall of the outer shell 1 forms an air passage C6.

[0030] More preferably, the inlet end of the first annular partition 2 is flush with the inlet end of the second annular partition 3, and the length of the first annular partition 2 is less than the length of the second annular partition 3, so that the front ends of the first annular partition 2, the front ends of the second annular partition 3, and the front ends of the outer shell 1 together form a stepped structure. This design divides the combustion process into two stages: primary combustion and secondary combustion. When the gas flows out from the gas channel B4, it first mixes with the air in the air channel A5 and undergoes primary combustion under the ignition of the ignition device 10. The remaining gas after primary combustion continues to flow and enters the air channel C6, where it mixes with the secondary air in the air channel C for secondary combustion. This staged combustion method can achieve a more optimized combustion process, improve combustion stability, enhance combustion efficiency, reduce pollutant emissions, and enhance safety.

[0031] The inner diameters of the first annular partition 2 and the second annular partition 3 can be designed according to different usage requirements, so that they can be selected for specific use.

[0032] Preferably, the outlet end of the gas channel B4 is provided with a channel B swirl vane 7, the outlet end of the air channel A5 is provided with a channel A swirl vane 8, and the outlet end of the air channel C6 is provided with a channel C swirl vane 9.

[0033] More preferably, the swirl vane 7 in channel B is oriented in the opposite direction to the swirl vane 8 in channel A and the swirl vane 9 in channel C. That is, the swirl vane direction in the gas channel is opposite to the swirl vane direction in the air channel. This causes the gas and air to form a counter-rotating airflow when entering the combustion zone 12, allowing the gas and air to mix more quickly and evenly. This ensures a more complete combustion process, reduces unburned gases, and thus reduces the emission of pollutants (such as CO and NOx). The counter-rotating airflow can form a stable combustion zone, enhance the stability of the flame, and help prevent flameout or backfire.

[0034] Preferably, the outer casing 1 is also provided with a flame detection device 11 for real-time monitoring of the flame status. Once the flame is detected to be extinguished or other abnormal conditions are detected, a signal will be immediately sent to cut off the gas supply and prevent safety accidents from occurring.

[0035] The operating principle of the above embodiments:

[0036] Air enters through air inlet 102 in the outer casing 1 and then flows into air passages A5 and C6 within the burner. Air passage A5 contains primary air, while air passage C6 contains secondary air. Coal gas enters gas passage B4 through gas inlet 101, first contacting the air in air passage A5 and undergoing primary combustion under the ignition of ignition device 10. The remaining coal gas after primary combustion continues to flow into air passage C6, where it mixes with the secondary air for secondary combustion. This staged combustion reduces the possibility of localized high temperatures within the burner, thereby reducing the amount of nitrogen oxides generated during coal gas combustion. Furthermore, staged combustion enhances the stability of coal gas combustion and improves combustion efficiency.

[0037] In summary, this application has at least the following advantages:

[0038] 1. The air is divided into two channels. The gas enters the burner for staged combustion. The primary combustion is oxygen-deficient combustion with a low flame temperature, which enhances the stability of gas combustion, reduces nitrogen oxide emissions, and is more in line with environmental protection requirements. The air-gas-air layered flow breaks through the traditional dual-channel mixing mode. The secondary air swirl slows down the gas diffusion, and the central direct flow of primary air enhances the penetration power, forming a long and stable flame.

[0039] 2. Compared to traditional air-gas dual-channel burners, multi-channel burners can select different primary and secondary air ratios and adjust the cross-sectional area of ​​the channels according to different working conditions to achieve more ideal results.

[0040] 3. The media in the three channels are air-gas-air from the inside out. Each channel has a channel swirl vane, and the swirl vane in the gas channel is in the opposite direction to the swirl vane in the air channel. This makes the mixing of gas and air more uniform.

[0041] 4. Through air isolation and flow equalization structure, it ensures that air and gas can be evenly distributed before entering the combustion zone, achieving intrinsic safety and explosion protection, reducing safety hazards during burner operation, and improving the safety and reliability of the equipment.

[0042] The technical features of the above embodiments can be combined in any way (as long as there is no contradiction in the combination of these technical features). For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described; these embodiments not explicitly written should also be considered to be within the scope of this specification.

Claims

1. A multi-channel low-pressure gas burner, characterized in that, The device includes a housing and an ignition device. The side walls of the housing are respectively provided with a gas inlet and an air inlet. The interior of the housing is provided with a gas channel B communicating with the gas inlet and an air channel A and an air channel C communicating with the air inlet. The gas channel B is located between the air channels A and C. The front end of the interior of the housing is a combustion zone. The ignition device ignites the mixed gas in the combustion zone by a high-voltage electric spark to realize the combustion process.

2. The multi-channel low-pressure gas burner according to claim 1, characterized in that, The outer shell has a cylindrical hollow structure, and inside it are arranged a first annular partition and a second annular partition at intervals from the inside to the outside. The inlet ends of the first annular partition and the second annular partition are provided with connecting plates corresponding to the gas inlet. The space between the inner wall of the first annular partition and the central axis of the outer shell constitutes the air passage A, the space between the outer wall of the first annular partition and the inner wall of the second annular partition constitutes the gas passage B, and the space between the outer wall of the second annular partition and the inner wall of the outer shell constitutes the air passage C.

3. The multi-channel low-pressure gas burner according to claim 2, characterized in that, The length of the first annular partition is less than the length of the second annular partition, so that the front ends of the first annular partition, the front ends of the second annular partition, and the front ends of the outer shell together form a stepped structure.

4. The multi-channel low-pressure gas burner according to claim 1, characterized in that, The outlet end of the gas channel B is provided with a channel B swirl vane, the outlet end of the air channel A is provided with a channel A swirl vane, and the outlet end of the air channel C is provided with a channel C swirl vane.

5. The multi-channel low-pressure gas burner according to claim 4, characterized in that, The direction of the swirl vane in channel B is opposite to that of the swirl vanes in channel A and channel C.

6. The multi-channel low-pressure gas burner according to claim 1, characterized in that, The exterior of the housing is also equipped with a flame detection device for real-time monitoring of the flame status.

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