Low-calorific-value gas burner

Abstract

The utility model discloses a low-heating-value gas burner, which relates to the technical field of industrial low-nitrogen burners and comprises a first shell, a combustion chamber, a central ignition component, a gas gun and an air supply structure. A combustion-supporting air inlet is formed in the first end of the first shell, and a combustion tail gas outlet is formed in the second end of the first shell. The combustion chamber is located in the first shell. The ignition end of the center ignition assembly is located in the center of the combustion chamber. The first end of the air gun is located outside the first shell, and the second end of the air gun is connected with the eccentric position of the combustion chamber. The air supply structure is used for providing combustion-supporting air and is provided with a first annular air supply area and a second annular air supply area, the first annular air supply area is located between the center ignition assembly and the air gun, the second annular air supply area is located on the outer side of the air gun, and the first annular air supply area and the second annular air supply area are coaxial. Compared with the prior art, the low-heating-value gas burner has the advantages that the burning stability can be obviously improved, and the generation amount of nitric oxide is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of industrial low-nitrogen burners, in particular to a low-calorific-value gas burner. Background Art

[0002] Low-calorific-value gas has a high content of inert gas and low calorific value, and has the defects of difficult ignition and poor combustion stability. At the same time, unreasonable combustion organization will form local high temperature and make the excessive combustion-supporting air stay in the high-temperature area for a long time, resulting in the excessive content of nitrogen oxides (NOx).

[0003] Direct combustion is a commonly used combustion method for low-calorific-value gas burners. Since low-calorific-value gas is a low-calorific-value fuel, flashback is very likely to occur in the case of direct combustion, resulting in inconvenient use of the burner and potential safety hazards. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a low-calorific-value gas burner to solve the problems existing in the above-mentioned related technologies, improve the combustion stability of low-calorific-value gas, and reduce the generation amount of nitrogen oxides.

[0005] To achieve the above purpose, the utility model provides the following scheme:

[0006] The utility model discloses a low-calorific-value gas burner, including:

[0007] A first housing, a combustion-supporting air inlet is provided at the first end of the first housing, and a combustion exhaust gas outlet is provided at the second end of the first housing;

[0008] A combustion chamber located inside the first housing, the first end of the combustion chamber faces the first end of the first housing, and the second end of the combustion chamber faces the second end of the combustion chamber;

[0009] A central ignition assembly for ignition, the ignition end of the central ignition assembly is located at the center of the combustion chamber;

[0010] A gas gun for supplying gas, the first end of the gas gun is located outside the first housing, the second end of the gas gun is connected to an eccentric position of the combustion chamber to supply gas to the combustion chamber; the number of the gas guns is not less than three, and at least three of the gas guns are circumferentially distributed around the central ignition assembly;

[0011] An air supply structure for providing combustion-supporting air, the air supply structure has a first annular air supply area and a second annular air supply area, the first annular air supply area is located between the central ignition assembly and the gas gun, the second annular air supply area is located outside the gas gun, and the first annular air supply area and the second annular air supply area are coaxial.

[0012] Preferably, the ignition assembly includes an ignition air gun, a Laffal ejector nozzle, an igniter and a flame monitor; the outlet of the Laffal ejector nozzle is located at the central position inside the combustion chamber, and the inlet of the Laffal ejector nozzle is located between the first end of the combustion chamber and the first end of the first housing; the first end of the ignition air gun is located outside the first housing, and there is a gap between the second end of the ignition air gun and the inlet of the Laffal ejector nozzle; the ignition end of the igniter is arranged adjacent to the outlet of the Laffal ejector nozzle, and the detection end of the flame monitor is arranged adjacent to the outlet of the Laffal ejector nozzle.

[0013] Preferably, the air supply structure includes a swirl ring, and the swirl ring is installed at the first end of the combustion chamber and is located outside the ignition assembly.

[0014] Preferably, the swirl ring is installed inside a cylinder. One end of the cylinder close to the combustion exhaust gas outlet is connected to the first end of the combustion chamber, the outer side surface of the cylinder is connected to a support plate, and the support plate is connected to the first housing.

[0015] Preferably, the air supply structure includes an air supply gap between the second end of the combustion chamber and the first housing.

[0016] Preferably, the air supply structure further includes air holes arranged on the combustion chamber.

[0017] Preferably, the combustion chamber is conical.

[0018] Preferably, the second end of the air gun is an inclined end face, the inclined end face faces the center of the combustion chamber, and spray holes are uniformly arranged on the inclined end face.

[0019] Preferably, the low calorific value gas burner further includes a second housing connected to the first end of the first housing, and a gas inlet is provided on the second housing; the first end of the air gun is located inside the second housing, and the central ignition assembly passes through the second housing.

[0020] Preferably, the low calorific value gas burner further includes an observation tube, the first end of the observation tube is located inside the first housing, and the second end of the observation tube is located outside the second housing.

[0021] The utility model has achieved the following technical effects compared with the related art:

[0022] The air supply structure of the utility model distributes at least three air guns circumferentially around the central ignition assembly, and respectively provides combustion-supporting air inside and outside the air guns through the air supply structure, improving the mixing effect of the gas and the combustion-supporting air, thereby improving the combustion stability and reducing the generation amount of nitrogen oxides.

[0023] In the preferred embodiment of the present utility model: 1. The Venturi injection structure is adopted to realize the premixing of ignition gas and air, effectively enhancing the stability of the ignition flame and reducing the generation of nitrogen oxides; 2. The combustion-supporting air adopts the staged air supply technology, effectively reducing the generation of nitrogen oxides; 3. The air excess coefficient inside the combustion chamber is relatively low (usually less than 1), which helps to improve the combustion stability of low-calorific-value gas. Through the above technical means, the emission of nitrogen oxides can be effectively reduced and the combustion stability of low-calorific-value gas can be enhanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or related technologies, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0025] Figure 1 It is a schematic diagram of a low-calorific-value gas burner in an embodiment of the present utility model.

[0026] In the figure: 1 - igniter; 2 - ignition gas gun; 3 - conduit; 4 - flame monitor; 5 - observation tube; 6 - end plate; 7 - second housing; 8 - gas inlet; 9 - partition; 10 - combustion-supporting air inlet; 11 - gas gun; 12 - mounting flange; 13 - support plate; 14 - swirl ring; 15 - combustion chamber; 16 - Venturi injection nozzle. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

[0028] The purpose of the present utility model is to provide a low-calorific-value gas burner to solve the problems existing in the above related technologies, improve the combustion stability of low-calorific-value gas, and reduce the generation amount of nitrogen oxides.

[0029] In order to make the above objects, features and advantages of the present utility model more obvious and understandable, the present utility model will be further described in detail below with reference to the drawings and specific embodiments.

[0030] Referring to Figure 1 , this embodiment provides a low-calorific-value gas burner, including a first housing, a combustion chamber 15, a central ignition assembly, a gas gun 11 and an air supply structure.

[0031] A combustion-supporting air inlet 10 is provided at the first end of the first housing, and a combustion exhaust gas outlet is provided at the second end of the first housing. A combustion chamber 15 is located inside the first housing. The first end of the combustion chamber 15 faces the first end of the first housing, and the second end of the combustion chamber 15 faces the second end of the combustion chamber 15. A central ignition assembly is used for ignition, and the ignition end of the central ignition assembly is located at the center of the combustion chamber 15. A gas gun 11 is used to supply fuel gas. The first end of the gas gun 11 is located outside the first housing, and the second end of the gas gun 11 is connected to an eccentric position of the combustion chamber 15 to supply fuel gas into the combustion chamber 15. The number of gas guns 11 is not less than three, and at least three gas guns 11 are circumferentially distributed around the central ignition assembly (preferably evenly distributed). The number of gas guns 11 can be adjusted according to the fuel gas intake and pressure, and is preferably an even number. A air supply structure is used to provide combustion-supporting air. The air supply structure has a first annular air supply area and a second annular air supply area. The first annular air supply area is located between the central ignition assembly and the gas gun 11, and the second annular air supply area is located outside the gas gun 11. The first annular air supply area and the second annular air supply area are coaxial.

[0032] The working principle of the low calorific value fuel gas burner in this embodiment is as follows:

[0033] In this embodiment, the air supply structure circumferentially distributes at least three gas guns 11 around the central ignition assembly, and provides combustion-supporting air inside and outside the gas gun 11 respectively through the air supply structure, improving the mixing effect of the fuel gas and the combustion-supporting air, thereby improving the combustion stability and reducing the generation amount of nitrogen oxides.

[0034] As a possible example, in this embodiment, the ignition assembly includes an ignition gas gun 2, a Laval ejector nozzle 16, an igniter 1, and a flame monitor 4. The outlet of the Laval ejector nozzle 16 is located at the center position inside the combustion chamber 15, and the inlet of the Laval ejector nozzle 16 is located between the first end of the combustion chamber 15 and the first end of the first housing. There is a gap between the first end of the ignition gas gun 2 located outside the first housing and the inlet of the Laval ejector nozzle 16. The ignition end of the igniter 1 is adjacent to the outlet of the Laval ejector nozzle 16, and the detection end of the flame monitor 4 is adjacent to the outlet of the Laval ejector nozzle 16.

[0035] Since there is a gap between the second end of the ignition gas gun 2 and the inlet of the Laval ejector nozzle 16, when the ignition fuel gas in the ignition gas gun 2 enters the first end of the Laval ejector nozzle 16, it will eject the combustion-supporting air inside the first housing, thereby pre-mixing the ignition fuel gas and the combustion-supporting air before ignition, effectively enhancing the flame stability, improving the ignition success rate, and reducing the generation of nitrogen oxides.

[0036] As a possible example, in this embodiment, the air supply structure includes a swirl ring 14. The swirl ring 14 is installed at the first end of the combustion chamber 15 and is located outside the ignition assembly. The swirl ring 14 has spiral vanes. After the combustion-supporting air passes through the swirl ring 14, it becomes spiral combustion-supporting air. The spiral combustion-supporting air has both circumferential movement and radial movement (centrifugal action), thereby agitating the fuel gas in the circumferential and radial directions, improving the distribution uniformity of the fuel gas inside the combustion chamber 15, further enhancing the combustion stability, and reducing the generation amount of nitrogen oxides.

[0037] There are various installation methods for the swirl ring 14, and those skilled in the art can select according to actual needs.

[0038] As a possible example, in this embodiment, the outside of the swirl ring 14 is connected to the inside of the cylinder, the inside of the swirl ring 14 is connected to the Laval ejector nozzle 16, one end of the cylinder close to the combustion exhaust gas outlet is connected to the first end of the combustion chamber 15, the outer side surface of the cylinder is connected to the support plate 13, and the support plate 13 is connected to the first housing. That is, in this embodiment, the cylinder is positioned by the support plate 13, the swirl ring 14 and the combustion chamber 15 are positioned by the cylinder, and the Laval ejector nozzle 16 is positioned by the swirl ring 14.

[0039] As a possible example, in this embodiment, the air supply structure includes an air supply gap between the second end of the combustion chamber 15 and the first housing. The combustion-supporting air flowing out of the air supply gap forms an air film, thereby separating the inside and outside of the air film, and reducing the influence of external air on the combustion process inside the air film. Especially in cases where the external environment is strong wind, high humidity, low temperature, etc., it can significantly improve the flame stability.

[0040] As a possible example, in this embodiment, the air supply structure further includes air holes disposed on the combustion chamber 15. The air holes are preferably evenly distributed on the combustion chamber 15. Compared with the air film and the spiral combustion-supporting air, the air holes are directly disposed on the combustion chamber 15, so the combustion-supporting gas provided by them is closer to the second end of the gas gun 11, making it easier for the fuel gas to mix with the combustion-supporting air.

[0041] As a possible example, in this embodiment, the combustion chamber 15 is conical. By adopting the conical structure, it plays a role in gathering the combustion flame, thereby improving the flame stability.

[0042] As a possible example, in this embodiment, the second end of the gas gun 11 is an inclined end face. The inclined end face faces the center of the combustion chamber 15, and spray holes are evenly arranged on the inclined end face. The above structure, on the one hand, makes the ejection direction of the fuel gas provided by the gas gun 11 face the ignition flame at the center of the combustion chamber 15, and on the other hand, provides a certain injection pressure, making the fuel gas provided by the gas gun 11 closer to the ignition flame, thereby improving the ignition success rate.

[0043] As a possible example, in this embodiment, the low calorific value gas burner further includes a second housing 7 connected to the first end of the first housing. The first housing and the second housing 7 are separated by a partition 9, and a gas inlet 8 is provided on the second housing 7. The first end of the gas gun 11 is located inside the second housing 7, and the central ignition assembly passes through the second housing 7. The first housing supplies gas to a plurality of gas guns 11 simultaneously, and the supply pressure of the gas in each gas gun 11 is the same, thereby improving the uniformity of the gas distribution in the combustion chamber 15.

[0044] As a possible example, in this embodiment, the low calorific value gas burner further includes an observation tube 5. The first end of the observation tube 5 is located inside the first housing, and the second end of the observation tube 5 is located outside the second housing 7. An operator can observe the combustion condition of the flame inside the first housing through the observation tube 5 to facilitate corresponding operations.

[0045] As a possible example, in this embodiment, the low calorific value gas burner further includes a conduit 3. The first end of the conduit 3 is connected to the end of the second housing 7 facing away from the partition 9, and the second end of the conduit 3 extends into the first housing. The ignition gas gun 2 is slidably disposed in the conduit 3, so as to support and guide the ignition gas gun 2 through the conduit 3.

[0046] As a possible example, in this implementation, a mounting flange 12 is connected to the outer side surface of the first housing, and mounting holes for mounting screws are provided on the mounting flange 12 to achieve the rapid installation of the low calorific value gas burner.

[0047] As a possible example, in this embodiment, the ignition gas gun 2, the Laffal ejector nozzle 16, and the first housing are coaxial, and the ignition gas gun 2 and the gas gun 11 are parallel to each other. The ignition gas gun 2 and the gas gun 11 are preferably round tubes, and other shapes such as square tubes can also be selected.

[0048] As a possible example, in this embodiment, the diameter of the spray hole is 1.5 mm to 5 mm, and the angle between the inclined end face of the second end of the gas gun 11 and the axis of the gas gun 11 is 20° to 70°. The cone apex angle of the combustion chamber 15 is 30° to 150°, and the diameter of the air hole is 2 mm to 8 mm.

[0049] As a possible example, in this embodiment, the air supply gap between the combustion chamber 15 and the first housing is not less than 10 mm, and the outer diameter of the swirl ring 14 is 1 / 3 to 2 / 3 of the inner diameter of the first housing.

[0050] As a possible example, in this embodiment, when the calorific value of the gas provided by the gas gun 11 is not less than 800 Kcal, the calorific value of the ignition gas provided by the ignition gas gun 2 is not less than 1200 Kcal.

[0051] As a possible example, in this embodiment, the igniter 1 is an ignition electrode or a high-frequency igniter 1, and the flame monitor 4 is an ion fire detector, an ultraviolet fire detector, or a red-ultraviolet integrated fire detector.

[0052] In summary, the low calorific value gas burner of this embodiment:

[0053] Adopts a Venturi injection structure to achieve premixing of ignition gas and air, effectively enhancing the stability of the ignition flame and reducing the generation of nitrogen oxides; the combustion-supporting air adopts a staged air supply technology to effectively reduce the generation of nitrogen oxides; the internal air excess coefficient of the combustion chamber 15 is relatively low (usually less than 1), which helps to improve the combustion stability of low calorific value gas. Through the above technical means, the emission of nitrogen oxides can be effectively reduced, and the combustion stability of low calorific value gas is enhanced.

[0054] Compared with other related technologies, the low calorific value gas burner of this embodiment has the following advantages: 1. Low nitrogen oxide emissions; 2. Complete combustion, almost no carbon monoxide is generated; 3. The adjustable load can reach 1:20; 4. Strong combustion stability; 5. Simple structure, low manufacturing cost, and low failure rate.

[0055] In the present utility model, specific examples are used to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model; at the same time, for those of ordinary skill in the art, according to the idea of the present utility model, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present utility model.

Claims

1. A low calorific value gas burner, characterized in that, Comprising: A first housing, a combustion-supporting air inlet is provided at a first end of the first housing, and a combustion exhaust gas outlet is provided at a second end of the first housing; A combustion chamber located inside the first housing, a first end of the combustion chamber faces the first end of the first housing, and a second end of the combustion chamber faces the second end of the combustion chamber; A central ignition assembly for ignition, an ignition end of the central ignition assembly is located at the center of the combustion chamber; A gas gun for supplying gas, a first end of the gas gun is located outside the first housing, a second end of the gas gun is connected to an eccentric position of the combustion chamber to supply gas into the combustion chamber; the number of the gas guns is not less than three, and at least three of the gas guns are circumferentially distributed around the central ignition assembly; A air supply structure for providing combustion-supporting air, the air supply structure has a first annular air supply area and a second annular air supply area, the first annular air supply area is located between the central ignition assembly and the gas gun, the second annular air supply area is located outside the gas gun, and the first annular air supply area and the second annular air supply area are coaxial.

2. The low calorific value gas burner according to claim 1, characterized in that: The ignition assembly includes an ignition gas gun, a Laffal ejector nozzle, an igniter and a flame monitor; an outlet of the Laffal ejector nozzle is located at a central position inside the combustion chamber, and an inlet of the Laffal ejector nozzle is located between the first end of the combustion chamber and the first end of the first housing; there is a gap between a first end of the ignition gas gun located outside the first housing and an inlet of the Laffal ejector nozzle; an ignition end of the igniter is adjacent to the outlet of the Laffal ejector nozzle, and a detection end of the flame monitor is adjacent to the outlet of the Laffal ejector nozzle.

3. The low calorific value gas burner according to claim 1, characterized in that: The air supply structure includes a swirl ring, the swirl ring is installed at the first end of the combustion chamber, and the swirl ring is located outside the ignition assembly.

4. The low calorific value gas burner according to claim 3, wherein: The swirl ring is installed inside a cylinder, one end of the cylinder close to the combustion exhaust gas outlet is connected to the first end of the combustion chamber, an outer side surface of the cylinder is connected to a support plate, and the support plate is connected to the first housing.

5. The low calorific value gas burner according to claim 1, characterized in that: The air supply structure includes an air supply gap between the second end of the combustion chamber and the first housing.

6. The low calorific value gas burner according to claim 1, characterized in that: The air supply structure further includes air holes arranged on the combustion chamber.

7. The low calorific value gas burner according to claim 1, characterized in that: The combustion chamber is conical.

8. The low calorific value gas burner according to claim 1, characterized in that: A second end of the gas gun is an inclined end face, the inclined end face faces the center of the combustion chamber, and spray holes are uniformly arranged on the inclined end face.

9. The low calorific value gas burner according to claim 1, characterized in that: It further includes a second housing connected to the first end of the first housing, a gas inlet is provided on the second housing; a first end of the gas gun is located inside the second housing, and the central ignition assembly passes through the second housing.

10. The low calorific value gas burner according to claim 9, characterized in that: It further includes an observation tube, a first end of the observation tube is located inside the first housing, and a second end of the observation tube is located outside the second housing.

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