Integrated stretching fuel gas premixing burner

Abstract

The utility model discloses an integrated stretching fuel gas premixing burner which comprises a metal cylinder, the metal cylinder is manufactured through an integrated stretching technology, one end of the metal cylinder is provided with a round opening, the other end of the metal cylinder is closed, a plurality of fire holes are formed in the side wall of the metal cylinder, and a metal wire mesh wraps the outer side of the side wall provided with the fire holes. The plurality of fire holes are arranged in a plurality of rows on the side wall of the metal cylinder around the axis of the metal cylinder; the sizes of the multiple fire holes in each row are different, and the sizes of the fire holes farther from one end of the circular opening are larger; the size of each fire hole is determined according to theoretical analysis and simulation results. Compared with the prior art, the metal cylinder is manufactured through the integrated stretching process, the related welding cost can be saved, the influence of thermal stress is smaller, and the defect that in the prior art, due to the fact that fire holes cannot be formed in weld joints, the combustion effect is affected is overcome.

Description

Technical Field

[0001] The utility model relates to the technical field of gas burner manufacturing, in particular to an integrated stretched gas premixing burner. Background Art

[0002] Fully premixed combustion refers to a combustion method in which the gas and air are premixed according to the stoichiometric ratio before the gas is ignited. In fully premixed combustion, the air and gas are mixed evenly, the combustion temperature is evenly distributed, local high-temperature areas are difficult to produce, and the generation of thermal NOx is suppressed. However, due to the fast combustion speed of fully premixed combustion, flashback is prone to occur under low-load operation, and the flashback interval needs to be avoided during operation; under high load or high excess air coefficient, the mixed gas airflow velocity is large, which is easy to exceed the combustion speed and cause flameout, and a flame stabilization device is required to stabilize the main flame.

[0003] like Figure 1 and Figure 2 As shown, an existing cylindrical gas premix burner has an opening at one end of the metal cylinder fixed inside the machine through a flange disc, and a top cover is arranged at the other end to form a mixed gas flow space. Each part is fixed by a weld formed by welding on the metal cylinder. Usually, fire holes are arranged in a certain pattern on the metal cylinder, or a metal wire mesh is coated on the outside of the cylinder body to control the flow velocity distribution of the mixed gas on the surface of the cylinder body. The mixed gas flows through the fire holes and the gaps in the metal wire mesh and burns on the surface of the burner.

[0004] However, the existing metal cylinder is fixed by welding, which not only has a complicated process and high cost, but also the weld will be affected by thermal stress and it is impossible to set a fire hole, which affects the combustion effect.

[0005] Therefore, how to solve the problem that the metal cylinder is easily affected by thermal stress due to the presence of the weld and the combustion effect is affected because the fire hole cannot be set at the weld position has become a technical problem that technical personnel in this field urgently need to solve. Utility Model Content

[0006] In view of the above-mentioned defects of the prior art, the utility model provides an integrated stretched gas premix burner, the purpose of which is to solve the problem that the metal cylinder is easily affected by thermal stress due to the existence of welds, and the combustion effect is affected because fire holes cannot be set at the weld position.

[0007] To achieve the above-mentioned purpose, the utility model discloses an integrated stretched gas premix burner, comprising a metal cylinder, which is made by an integrated stretching process, has a circular opening at one end and is closed at the other end, has a plurality of fire holes on the side wall, and the outer side of the side wall with the plurality of fire holes is covered with a metal wire mesh;

[0008] The plurality of fire holes are arranged in a plurality of rows on the side wall of the metal cylinder around the axis of the metal cylinder;

[0009] The sizes of the plurality of fire holes in each row are different, and the size of the fire hole that is farther from one end of the circular opening is larger;

[0010] The size of each of the fire holes is determined based on theoretical analysis and simulation results.

[0011] Preferably, one end of the circular opening of the metal cylinder has an integrally formed flange structure as a mounting structure.

[0012] Preferably, all the fire holes at the same distance from the circular opening have the same size.

[0013] Preferably, the distance between each of the fire holes in the odd-numbered rows and the circular opening is the same; the distance between each of the fire holes in the even-numbered rows and the circular opening is the same;

[0014] The distance between each of the fire holes in the odd-numbered rows and the circular opening is different from the distance between each of the fire holes in the even-numbered rows and the circular opening;

[0015] The number of the fire holes in the odd-numbered rows is the same;

[0016] The number of the fire holes in the even-numbered rows is the same;

[0017] The number of the fire holes in the odd-numbered rows is different from the number of the fire holes in the even-numbered rows.

[0018] Preferably, each of the fire holes is rectangular, and the lengths of the two sides parallel to the axis of the metal cylinder are greater than the lengths of the other two sides.

[0019] Beneficial effects of the utility model:

[0020] The utility model uses an integrated stretching process to manufacture the metal cylinder, which can save welding-related costs and is less affected by thermal stress. The defect that the combustion effect is affected due to the inability to arrange fire holes at the weld seam as in the prior art will not occur.

[0021] The concept, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A structural schematic diagram of the prior art is shown.

[0023] Figure 2 Show the utility model Figure 1Schematic diagram of the local structure at point C in the middle.

[0024] Figure 3 A structural schematic diagram of an embodiment of the utility model is shown.

[0025] Figure 4 Show the utility model Figure 3 Schematic diagram of the local structure at point A in the middle. DETAILED DESCRIPTION

[0026] Example

[0027] like Figure 3 and Figure 4 As shown, the integrally stretched gas premix burner comprises a metal cylinder 3, which is made by an integrally stretched process, has a circular opening at one end and is closed at the other end, and has a plurality of fire holes 1 on the side wall, and the outer side of the side wall with the plurality of fire holes 1 is covered with a metal wire mesh 2;

[0028] A plurality of fire holes 1 are arranged in a plurality of rows on the side wall of the metal cylinder 3 around the axis of the metal cylinder 3;

[0029] The sizes of the multiple fire holes 1 in each row are different, and the size of the fire hole 1 that is farther away from one end of the circular opening is larger;

[0030] The size of each fire hole 1 is determined based on theoretical analysis and simulation results.

[0031] Compared with the prior art, the metal cylinder 3 of the utility model is made by an integrated stretching process without a weld formed by three parts welded in the prior art, and the specific size of each fire hole 1 is determined according to theoretical analysis and simulation results to control the flow velocity distribution of the mixed gas in the axial direction.

[0032] Compared with the metal cylinder 3 welded in the prior art, the utility model can avoid being welded from multiple parts, and will not cause gaps due to welding errors or external forces; the metal cylinder 3 made by the integral stretching process can save welding-related costs and is less affected by thermal stress;

[0033] The defect that the combustion effect is affected because the fire hole 1 cannot be arranged at the weld as in the prior art will not occur.

[0034] Through theoretical analysis and comparison of simulation results, it is found that starting from the root side of the burner, along the axial direction of the metal cylinder 3, the mixed gas airflow velocity at each fire hole 1 gradually decreases. The higher the airflow velocity, the easier it is to de-ignite, while the lower the airflow velocity, the easier it is to extinguish, both of which will affect the burner performance. Therefore, according to the specific situation of each fire hole 1, its size is determined to balance the velocity of the mixed gas airflow at each fire hole 1.

[0035] In practical applications, the size of the fire holes 1 needs to be changed based on testing and analysis. If the combustion is good under medium and low loads, the proportion of fire holes without flames is small, but under high loads, more fire holes can be visually seen, especially at the burner head, where more fire holes without flames appear, then the size of each fire hole 1 needs to be improved.

[0036] In some embodiments, one end of the circular opening of the metal cylinder 3 has an integrally formed flange structure as a mounting structure.

[0037] In some embodiments, all fire holes 1 at the same distance from the circular opening have the same size.

[0038] In some embodiments, each fire hole in an odd row of fire holes 1 is at the same distance from the circular opening;

[0039] The distance between each fire hole and the circular opening in the even-numbered rows of fire holes 1 is the same;

[0040] The distance between each fire hole 1 in the odd-numbered rows and the circular opening is different from the distance between each fire hole 1 in the even-numbered rows and the circular opening;

[0041] The number of the odd-numbered rows of fire holes 1 is the same;

[0042] The number of fire holes 1 in even-numbered rows is the same;

[0043] The number of the fire holes 1 in the odd numbered rows is different from the number of the fire holes 1 in the even numbered rows.

[0044] In some embodiments, each fire hole 1 is rectangular, and the lengths of the two sides parallel to the axis of the metal cylinder 3 are greater than the lengths of the other two sides.

[0045] The preferred specific embodiments of the utility model are described in detail above. It should be understood that ordinary technicians in this field can make many modifications and changes based on the concept of the utility model without creative work. Therefore, all technical solutions that can be obtained by technicians in this technical field based on the concept of the utility model through logical analysis, reasoning or limited experiments on the basis of the existing technology should be within the scope of protection determined by the claims.

Claims

1. An integrally stretched gas premix burner, comprising a metal cylinder (3); characterized in that: The metal cylinder (3) is made by an integral stretching process, has a circular opening at one end and is closed at the other end, and has a plurality of fire holes (1) on its side wall. The outer side of the side wall having the plurality of fire holes (1) is covered with a metal wire mesh (2); A plurality of the fire holes (1) are arranged in a plurality of rows on the side wall of the metal cylinder (3) around the axis of the metal cylinder (3); The sizes of the plurality of fire holes (1) in each row are different, and the size of the fire hole (1) that is farther from one end of the circular opening is larger; The size of each of the fire holes (1) is determined based on theoretical analysis and simulation results.

2. The integrated stretched gas premix burner according to claim 1, characterized in that: One end of the circular opening of the metal cylinder (3) is provided with an integrally formed flange structure as a mounting structure.

3. The integrated stretched gas premix burner according to claim 1, characterized in that: All the fire holes (1) that are at the same distance from the circular opening have the same size.

4. The integrated stretched gas premix burner according to claim 1, characterized in that: The distance between each of the fire holes (1) in an odd number of rows and the circular opening is the same; The distance between each of the fire holes (1) in an even number of rows and the circular opening is the same; The distance between each of the fire holes (1) in an odd number of rows and the circular opening is different from the distance between each of the fire holes (1) in an even number of rows and the circular opening; The number of the fire holes (1) in the odd-numbered rows is the same; The number of the fire holes (1) in the even-numbered rows is the same; The number of the fire holes (1) in the odd-numbered rows is different from the number of the fire holes (1) in the even-numbered columns.

5. The integrated stretched gas premix burner according to claim 1, characterized in that: Each of the fire holes (1) is rectangular, and the lengths of the two sides parallel to the axis of the metal cylinder (3) are greater than the lengths of the other two sides.

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