Fuel gas and air premixing burner structure

Abstract

A fuel gas and air premixing burner structure comprises an air conveying pipe, a gas inlet, a gas outlet, a gas inlet and a gas outlet, the gas conveying pipe is used for conveying gas to a gas outlet of the air conveying pipe to be mixed with air, the gas conveying pipe is arranged in the air conveying pipe and comprises a main pipe and a plurality of branch pipes, the main pipe and the air conveying pipe are in the same direction, the main pipe extends forwards to the gas outlet of the air conveying pipe, a gas distribution part is formed at the front end of the main pipe, and the branch pipes are communicated with the gas outlet of the air conveying pipe. The plurality of branch pipes are all in the front-back direction and are connected with the gas distribution part, and the front ends of the branch pipes are provided with forward nozzles; the combustion stabilizing plate is used for blocking mixed gas sent out from an air outlet of the air conveying pipe, the combustion stabilizing plate is arranged on the front side of the air outlet and comprises two plate bodies which are arranged in a bilateral symmetry mode, the edges of the rear sides of the two plate bodies are connected, the distance between the two plate bodies is gradually increased from back to front, and the two plate bodies are in a V shape. Generation of nitric oxide can be reduced, and combustion is stable, reliable and efficient.

Description

Technical Field

[0001] The utility model belongs to the technical field of burners, and in particular relates to a gas-air premixed burner structure. Background Art

[0002] For cleaner high calorific value gases, such as natural gas, a large amount of thermal nitrogen oxides will be produced during combustion. Therefore, various burner manufacturers will add auxiliary nitrogen reduction technologies such as flue gas recirculation when designing and manufacturing high calorific value burners. However, the flue gas recirculation system has problems such as reduced thermal efficiency and formation of condensed water.

[0003] There are also some surface burners and burners that use premixed combustion. The gas and air are premixed and then burned. The premixed combustion reaction is violent and the flame propagation speed is fast, which can achieve ultra-low emissions. However, it can only be used on small-tonnage boilers and the high oxygen content must be strictly controlled. Otherwise, it is easy to backfire or flameout, resulting in unstable combustion.

[0004] It can be seen that the existing technology cannot meet the requirements of low-nitrogen, stable and efficient combustion. Utility Model Content

[0005] Based on this, in order to solve the above technical problems, a gas-air premix burner structure is provided.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A gas-air premix burner structure, characterized by comprising:

[0008] An air delivery pipe, wherein the front portion of the air delivery pipe is an air outlet;

[0009] A gas delivery pipe for delivering gas to the air outlet of the air delivery pipe for mixing with air, the gas delivery pipe being arranged in the air delivery pipe and comprising a main pipe and a plurality of branch pipes, the main pipe being in the same direction as the air delivery pipe and extending forward to the air outlet of the air delivery pipe, and forming an air distribution portion at the front end, the plurality of branch pipes being in a front-to-back direction and connected to the air distribution portion, the front ends of the branch pipes having a forward-facing nozzle;

[0010] A combustion stabilizing plate is used to block the mixed gas sent out from the air outlet of the air duct. The combustion stabilizing plate is arranged on the front side of the air outlet, and includes two plate bodies arranged symmetrically on the left and right. The rear edges of the two plate bodies are connected, and the distance between the two plate bodies gradually increases from the back to the front, forming a V shape.

[0011] The utility model uses the air delivery pipe and the gas delivery pipe to premix the air and gas inside the air outlet of the air delivery pipe and then deliver the mixed gas. The delivered mixed gas is further evenly mixed by the downstream combustion stabilizing plate, so that the combustion is more uniform, and a high combustion peak temperature can be avoided, thereby reducing the generation of nitrogen oxides. The combustion stabilizing plate can also make the combustion stable, reliable and efficient, and there will be no phenomenon such as flameout. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural diagram of the utility model;

[0013] Figure 2 This is a front structural diagram of the present invention;

[0014] Figure 3 It is a side structural schematic diagram of the present utility model. DETAILED DESCRIPTION

[0015] The following will illustrate the implementation of the present utility model in conjunction with the drawings in the specification. It should be noted that the implementation methods involved in this specification are not exhaustive and do not represent the only implementation methods of the present utility model. The following corresponding embodiments are only for the purpose of clearly illustrating the utility model content of the utility model patent and are not intended to limit its implementation methods. For ordinary technicians in this field, different forms of changes and modifications can be made on the basis of the description of this embodiment. All obvious changes or modifications that belong to the technical concept and utility model content of the present utility model are also within the scope of protection of the present utility model.

[0016] like Figure 1 As shown, an embodiment of the present application provides a gas-air premix burner structure, including an air delivery pipe 1100 , a gas delivery pipe 1200 and a combustion stabilizing plate 1300 .

[0017] The front portion of the air delivery tube 1100 is an air outlet.

[0018] The gas delivery pipe 1200 is used to deliver gas to the outlet of the air delivery pipe 1100 for mixing with air. The gas delivery pipe 1200 is entirely disposed within the air delivery pipe and includes a main pipe 1210 and multiple branch pipes 1220.

[0019] The main pipe 1210 and the air delivery pipe 1100 are in the same direction. In this embodiment, the two are concentric (their center lines coincide).

[0020] The main pipe 1210 extends forward to the air outlet of the air delivery pipe 1100 and forms an air distribution part 1211 at the front end. The multiple branch pipes 1220 are all in the front-to-back direction and are connected to the air distribution part 1211. The front end of the branch pipe 1220 has a nozzle 1221 facing forward. Figure 2 .

[0021] The gas enters from the main pipe 1210, is distributed to each branch pipe 1220 through the inner cavity of the gas distribution part 1211, and is ejected forward from the nozzle 1221 of each branch pipe 1220, just mixing with the air delivered to the air outlet of the air delivery pipe 1100.

[0022] Each branch pipe 1220 may have multiple nozzles 1221, and may be made into multiple angles as needed, so that the gas injection area is wider and the degree of mixing with the air is better.

[0023] In this embodiment, the radial cross-section of air delivery pipe 1100 is rectangular, and the air distribution section 1211 is tubular (hereinafter referred to as the air distribution pipe). The radial cross-sections of the air distribution pipe, main pipe 1210, and branch pipes 1220 are all circular. The central portion of the air distribution pipe is perpendicularly connected to the front end of main pipe 1210. Multiple branch pipes 1220 are evenly spaced along the axial direction of the air distribution pipe and are perpendicularly connected to the air distribution pipe. The centerlines of main pipe 1210, air distribution section, and branch pipes 1220 lie in the same plane.

[0024] The combustion stabilizing plate 1300 is used to block the mixed gas sent out from the air outlet of the air delivery pipe 1100. The combustion stabilizing plate 1300 is arranged on the front side of the air outlet. It includes two plate bodies 1310 arranged symmetrically on the left and right. The rear edges of the two plates 1310 are connected, and the distance between the two gradually increases from the back to the front, forming a V shape.

[0025] After being blocked by the combustion stabilizing plate 1300, the mixture is further evenly mixed, making the combustion more uniform, avoiding a high peak combustion temperature, and thus reducing the generation of nitrogen oxides.

[0026] In order to further improve the uniform mixing ability, the rear edges of the two plates 1310 are aligned with the center line of the gas distribution pipe. Figure 2 .

[0027] The gas and air are mixed and then burned, and the combustion speed is very fast. If the mixed flow rate and the combustion speed do not match, it is very easy to cause flameout and flameout. In the embodiment of the present application, a combustion stabilizing plate 1300 is arranged downstream of the gas-air mixture to create a negative pressure in the combustion center area, which can make the high-temperature flue gas reflux, ensure the ignition heat, make the combustion stable, reliable and efficient, and avoid flameout and other phenomena. Figure 3 .

[0028] like Figure 1 and Figure 2 As shown, each plate 1310 has a plurality of ventilation and cooling holes 1311 arranged in an array.

[0029] From the above, it can be seen that the embodiment of the present application provides a gas-air premixing burner structure, which premixes air and gas inside the air outlet of the air delivery pipe through the air delivery pipe and the gas delivery pipe and then delivers them. The delivered mixed gas is further evenly mixed by the downstream stabilizing plate, making the combustion more uniform, avoiding a higher combustion peak temperature, and thereby reducing the generation of nitrogen oxides. The stabilizing plate can also make the combustion stable, reliable and efficient, without the occurrence of phenomena such as flameout.

[0030] The burner structure of the embodiment of the present application can be applied to boilers, or metallurgical and petrochemical industrial furnaces. According to power requirements, multiple burner structures can be combined together to form a high-power burner.

[0031] Obviously, those skilled in the art should realize that the above embodiments are only used to illustrate the present invention and are not used to limit the present invention. As long as they are within the spirit of the present invention, any changes or modifications to the above embodiments will fall within the scope of the claims of the present invention.

Claims

1. A gas-air premix burner structure, characterized in that: include: An air delivery pipe, wherein the front portion of the air delivery pipe is an air outlet; A gas delivery pipe for delivering gas to the air outlet of the air delivery pipe for mixing with air, the gas delivery pipe being arranged in the air delivery pipe and comprising a main pipe and a plurality of branch pipes, the main pipe being in the same direction as the air delivery pipe and extending forward to the air outlet of the air delivery pipe, and forming an air distribution portion at the front end, the plurality of branch pipes being in a front-to-back direction and connected to the air distribution portion, the front ends of the branch pipes having a forward-facing nozzle; A combustion stabilizing plate is used to block the mixed gas sent out from the air outlet of the air duct. The combustion stabilizing plate is arranged on the front side of the air outlet, and includes two plate bodies arranged symmetrically on the left and right. The rear edges of the two plate bodies are connected, and the distance between the two plate bodies gradually increases from the back to the front, forming a V shape.

2. A gas-air premix burner structure according to claim 1, characterized in that: The radial cross section of the air delivery pipe is rectangular.

3. A gas-air premix burner structure according to claim 1, characterized in that: The air distribution section is tubular, with its middle portion vertically connected to the front end of the main pipe. The multiple branch pipes are evenly spaced along the axial direction of the air distribution section and are all vertically connected to the air distribution section. The center lines of the main pipe, air distribution section and branch pipes are located in the same plane.

4. A gas-air premix burner structure according to claim 3, characterized in that: The radial cross-sections of the main pipe, valve distribution section and branch pipes are all circular.

5. The gas-air premix burner structure according to claim 3, characterized in that: The main pipe is concentric with the air delivery pipe.

6. A gas-air premix burner structure according to claim 3, characterized in that: The rear side edges of the two plates coincide with the center line of the gas distribution portion in front and back.

7. The gas-air premix burner structure according to claim 1, characterized in that: The plate body is provided with a plurality of ventilation and cooling holes.

8. A gas-air premix burner structure according to claim 7, characterized in that: The plurality of ventilation cooling holes are arranged in an array.

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