Anti-backfire large metal fiber burner

Abstract

The utility model relates to the field of combustors, in particular to an anti-backfire large metal fiber combustor which comprises a gas cavity, a gas inlet pipe, a metal fiber net and a gas net plate, the gas cavity is used for containing gas, a gas inlet is formed in the gas cavity and communicated with the gas inlet pipe, one opening face of the gas cavity is connected with the metal fiber net and the gas net plate, and the metal fiber net and the gas net plate are communicated with the gas inlet pipe. A gas uniformizing plate is additionally arranged in an inner cavity of the gas cavity, the surface area of the gas uniformizing plate is larger than the cross sectional area of the gas inlet, the gas uniformizing plate covers the gas inlet, the surface area of the gas uniformizing plate is smaller than the cross sectional area of the gas cavity, and the largest surface of the gas uniformizing plate is parallel to the opening face, where the metal fiber net is located, of the gas cavity. The metal fiber burner has the advantages that the volume range of the gas cavity of the metal fiber burner can be increased by a certain degree, and tempering is eradicated within the range.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of metal fiber burners, in particular to a large metal fiber burner capable of preventing backfire. BACKGROUND

[0002] The metal fiber burner is a device made of heat-resistant alloy steel fibers, and the metal fiber burner belongs to premixed gas surface combustion. A uniformly premixed gas-air mixture flows to the head of the metal fiber burner and burns on the surface layer of the gas-permeable metal fiber fabric.

[0003] The combustion is carried out in two ways, namely, infrared thermal radiation and blue flame. The infrared thermal radiation is that the combustible mixture burns inside the fabric, and the metal fiber fabric is heated to an incandescent state, and part of the heat is released in the form of radiation. The blue flame is that the combustible mixture burns above the fabric, and the flame floats on the surface in blue, and the heat is released in the form of convection.

[0004] The metal fiber burner has the characteristics of infrared radiation, low pollution emission, corrosion resistance, oxidation resistance, super-long service life, high temperature combustion and the like, and is applied to many industries, including household ovens, industrial furnaces, food industry, textile industry, automobile industry, glass manufacturing industry, steel casting industry and the like.

[0005] Due to the uniform gas permeability of the metal fiber fabric and the uniform premixing of the gas and air, the combustion is very stable and the temperature distribution is uniform, and there is no local high temperature, so that the generation of NOx is inhibited.

[0006] At present, the structure of the metal fiber burner usually comprises a metal fiber net, a gas net plate, a gas cavity and an air inlet pipe, the air inlet pipe is connected to the gas cavity, the air inlet pipe supplies combustible gas to the gas cavity, and the metal fiber net and the gas net plate are usually arranged in parallel, and some metal fiber nets and gas net plates are arranged at a certain interval to ensure that the gas emitted after being dispersed by the gas net plate has a longer combustion process and is more fully combusted, thereby reducing the generation of CO. Although the metal fiber net itself has a certain gas dispersion function, the superposition of the metal fiber net and the gas net plate can better ensure the dispersion, so that the combustion is evenly distributed over the surface area of the metal fiber net, rather than locally combusting on the surface of the metal fiber net. The gas net plate can also reduce the probability of backfire of the metal fiber burner to a certain extent.

[0007] However, the overall size of the metal fiber burner is relatively small due to the hidden danger of backfire, and the width of the largest metal fiber burner on the market does not exceed 160 mm, and the volume of the gas cavity is less than 6 liters. This backfire hidden danger restricts the development of the metal fiber burner towards a larger use range.

[0008] Therefore, in order to break through the volume limit of the metal fiber burner gas cavity and enable it to provide more heat, the risk of tempering needs to be overcome. Utility model content

[0009] In order to solve the above technical problems, the application provides a large metal fiber burner capable of preventing tempering.

[0010] The application provides a large metal fiber burner capable of preventing tempering, which adopts the following technical scheme:

[0011] A large metal fiber burner capable of preventing tempering comprises a gas cavity, an air inlet pipe, a metal fiber mesh and a gas mesh plate, the gas cavity is used for accommodating gas, an air inlet is formed on the gas cavity, the air inlet is communicated with the air inlet pipe, the metal fiber mesh and the gas mesh plate are respectively connected to one opening surface of the gas cavity, a gas uniform plate is additionally arranged in the inner cavity of the gas cavity, the surface area of the gas uniform plate is greater than the cross-sectional area of the air inlet, the gas uniform plate covers the air inlet, the surface area of the gas uniform plate is smaller than the cross-sectional area of the gas cavity, and the maximum surface of the gas uniform plate is parallel to the opening surface of the gas cavity where the metal fiber mesh is located.

[0012] By adopting the above technical scheme, the volume of the metal fiber burner gas cavity can be increased within a certain range, and tempering can be completely eliminated within the range. The surface area of the gas uniform plate is greater than the cross-sectional area of the air inlet, and the gas uniform plate covers the air inlet, so that the gas discharged from the air inlet is required to pass through the lower surface of the gas uniform plate, and the gas is dispersed by the gas uniform plate.

[0013] Further, the air inlet is formed in the vertical bottom of the gas cavity, the opening surface of the gas cavity where the metal fiber mesh is located is located in the vertical top of the gas cavity, and the gas mesh plate is an arc surface.

[0014] By adopting the above technical scheme, the air inlet direction (the position of the air inlet) and the combustion direction of the metal fiber mesh are set to be the same, so that the gas entering the air inlet is directly supplied to the gas mesh plate vertically upward, the gas is combusted between the gas mesh plate and the metal fiber mesh after being dispersed by the gas mesh plate, the position of the air inlet can also provide a certain upward pressure for the gas after being dispersed by the gas mesh plate, so as to open more spacing between the gas mesh plate and the metal fiber mesh, increase the combustion process and better fully combust. The arc surface of the gas mesh plate can better increase the combustion area and provide more combustion heat.

[0015] Further, the horizontal cross-sectional area of the gas cavity is greater than the vertical cross-sectional area of the gas cavity, and the gas uniform plate is horizontally arranged in the gas cavity.

[0016] By adopting the technical scheme, the gas uniformizing plate is horizontally arranged, which can better disperse the upward vertical gas, and the shape of the gas cavity (flat shape with small height) is arranged to ensure better dispersion effect with the gas uniformizing plate and ensure that the gas has enough pressure when reaching the upper surface of the gas mesh plate, and the pressure can push the flame generated by combustion towards the upper surface of the metal fiber mesh, thereby reducing the probability of backfire.

[0017] Further, the distance from the gas uniformizing plate to the vertical bottom of the gas cavity accounts for two-thirds of the height from the gas mesh plate to the vertical bottom of the gas cavity.

[0018] By adopting the technical scheme, the gas uniformizing plate is additionally arranged in the gas cavity, which has the functions of pressure reduction and dispersion, and cannot reduce the pressure too much, and also needs to have good dispersion uniformity and balanced pressure on the combustion surface, so the dispersion position of the gas uniformizing plate in the gas cavity is a crucial means.

[0019] Further, the gas uniformizing plate further comprises two extension edges, the length extension direction of the gas uniformizing plate is consistent with the length extension direction of the gas cavity, the length extension direction of the two extension edges is consistent with the length extension direction of the gas uniformizing plate, the two extension edges are respectively located on both sides of the width of the gas uniformizing plate, an included angle is arranged between the width extension direction of the extension edge and the width extension direction of the gas uniformizing plate, and the width extension direction of the extension edge tends to be close to the vertical bottom of the gas cavity.

[0020] By adopting the technical scheme, the two extension edges are specifically arranged to further optimize the dispersion effect, pressure reduction effect and dispersion uniformity of the gas uniformizing plate in the gas cavity.

[0021] Further, the gas uniformizing plate is connected with the vertical bottom of the gas cavity through a connecting plate, the connecting plate is arranged at both ends of the length direction of the gas uniformizing plate, and the connecting plate and the gas inlet are arranged in a staggered manner in the length direction of the gas uniformizing plate.

[0022] By adopting the technical scheme, the connecting plate for fixing the gas uniformizing plate is arranged at both ends of the length direction of the gas uniformizing plate to form a complementary interference effect with the gas inlet close to the middle point in the length direction of the gas uniformizing plate, the gas uniformizing plate is arranged to reduce the pressure and disperse the gas and ensure the dispersion uniformity of the gas on the combustion surface, so in this effect, the flow smoothness of the gas is a factor affecting the effect, and the connecting plate and the gas inlet are arranged in a staggered manner in the length direction of the gas uniformizing plate to ensure that the gas flowing out of the gas inlet in the gas cavity is as smooth as possible.

[0023] Further, a flange structure is additionally arranged at the connection between the gas inlet and the gas inlet pipe, one end of the flange structure is communicated with the gas inlet through the inlet pipe, the other end of the flange structure is communicated with the gas inlet pipe, and a gas uniformizing sheet is arranged between the two flange sheets of the flange structure.

[0024] By adopting the above technical scheme, the role of the gas distribution piece is similar to that of the gas distribution plate, both of which are to reduce and disperse the gas delivered by the gas inlet pipe.

[0025] Further, the gas distribution piece is provided with a plurality of uniformly distributed through holes, and the flow direction of the through holes is consistent with the flow direction of the gas inlet pipe.

[0026] By adopting the above technical scheme, the plurality of uniformly distributed through holes can ensure the uniformity of the gas dispersion in the gas inlet pipe.

[0027] Further, a plurality of pressing strips are provided on the top of the gas cavity, and the plurality of pressing strips are arranged in parallel on the outer side of the metal fiber mesh. The two ends of the pressing strip in the length extension direction are respectively provided with connecting ends, and the two ends of the gas cavity in the length extension direction are respectively provided with connecting grooves. The connecting ends are slidably connected in the connecting grooves.

[0028] By adopting the above technical scheme, the pressing strip can limit the burning metal fiber mesh, and the connecting ends are slidably connected in the connecting grooves to realize the limiting of the pressing strip within a certain spacing range on the upper end of the metal fiber mesh.

[0029] Further, the vertical bottom surface of the gas cavity and the two side surfaces in the width direction are respectively provided with inclined transition plates.

[0030] By adopting the above technical scheme, the inclined transition plate is used to better ensure the smoothness of the gas flow in the combustion cavity.

[0031] In summary, the present application has the following at least one beneficial technical effect:

[0032] 1. By adopting the above technical scheme, the volume of the metal fiber burner gas cavity can be increased within a certain range, and backfire can be eliminated within the range.

[0033] 2. The gas flow is smooth;

[0034] 3. The gas is reduced and dispersed in the gas inlet pipe and the combustion cavity, respectively, which better eliminates the backfire phenomenon;

[0035] 4. The burning area is larger, which can provide better heat.

[0036] 5. The combustion is good. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 It is a whole structure schematic diagram of a large-scale anti-backfire metal fiber burner.

[0038] Figure 2 It is a sectional view of the gas cavity.

[0039] Explanation of reference signs: 1, gas cavity; 2, gas inlet pipe; 3, metal fiber net; 4, gas net plate; 5, gas uniform plate; 6, connecting plate; 7, gas uniforming piece; 8, flange piece; 9, pressing strip; 10, extending edge; 11, transition plate; 12, igniter; 13, gas inlet branch pipe; 14, connecting edge. DETAILED DESCRIPTION

[0040] The application is further described in detail below with reference to all the accompanying drawings.

[0041] The application discloses a large metal fiber burner capable of preventing backfire.

[0042] As Figure 1 and Figure 2As shown, a large metal fiber burner against backfire, including gas cavity 1, gas inlet pipe 2, metal fiber net 3 and gas net plate 4, the gas cavity 1 for containing gas, gas cavity 1 on the opening of the gas inlet, the gas inlet pipe 2 communication, gas cavity 1 an opening surface respectively connected with metal fiber net 3 and gas net plate 4, specifically, the vertical upper end of gas cavity 1 extends two horizontal connecting edge 14, gas net plate 4 in width both ends are fixedly connected with connecting edge 14.In the inner cavity of gas cavity 1 is additionally provided with gas uniform plate 5, the surface area of gas uniform plate 5 is greater than the cross-sectional area of gas inlet, gas uniform plate 5 covers the gas inlet, the surface area of gas uniform plate 5 is less than the cross-sectional area of gas cavity 1, the maximum surface of gas uniform plate 5 is parallel to the opening surface of gas cavity 1 where the metal fiber net 3 is located.The gas delivery of the present application needs to be pressurized and then enters the inside of gas cavity 1 through gas inlet pipe 2.The conventional metal fiber burner can be divided into cylindrical, plate type and other shapes, cylindrical, i.e.the cylindrical shape used in boiler combustion, such as patent number CN217031187U, full premixed low nitrogen condensing boiler metal fiber burner patent technology, the technical scheme of the present application belongs to the plate type metal fiber burner.Gas uniform plate 5 is a flat plate without through hole, which is different from the gas net plate 4 in the prior art.The gas uniform plate 5 in the present application is actually to solve the backfire problem after increasing the volume of the metal fiber burner in the prior art, and to break through the technical limitation.The width of the existing fiber burner is not more than 160MM, and the volume of the gas cavity is less than 6 liters.The gas cavity of the metal fiber burner of the present application can reach 7-28 liters.In this gas cavity range, the technical scheme of the present application can effectively avoid backfire, greatly improve the single supply heat of the metal fiber burner and expand the application range of the metal fiber burner.The gas inlet branch pipe 13 is bypassed connected with the gas inlet branch pipe 13, the other end of the gas inlet branch pipe 13 extends to the vertical upper part of the gas cavity 1, which is located outside the metal fiber net 3.The gas outlet end of gas inlet branch pipe 13 is respectively connected with gas outlet and igniter 12, which ensures that the gas of gas outlet is always in combustion state to ensure that the combustion of metal fiber net 3 is continuous and uninterrupted.

[0043] As Figure 2 shown, the gas inlet is arranged in the vertical bottom of gas cavity 1, and the opening surface of gas cavity 1 where the metal fiber net 3 is located is located in the vertical top of gas cavity 1.The gas inlet is arranged at the position close to the center point in the vertical bottom of gas cavity 1, the gas in the gas cavity 1 of the present application takes vertical upward gas inlet, vertical upward gas outlet, and upward combustion radiation heat at the top of gas cavity 1.

[0044] As Figure 2As shown, the horizontal cross-sectional area of the gas cavity 1 is greater than the vertical cross-sectional area of the gas cavity 1, and the gas uniform plate 5 is horizontally arranged in the gas cavity 1. The overall structure of the gas cavity 1 is a flat plate structure, and the height of the gas cavity 1 in the vertical direction is much smaller than the width of the gas cavity 1 and the length of the combustion chamber. The length of the combustion chamber is greater than the width of the gas cavity 1. The length extension direction of the combustion chamber is consistent with the length extension direction of the gas uniform plate 5.

[0045] As shown in Figure 2 , the distance from the gas uniform plate 5 to the vertical bottom of the gas cavity 1 is two-thirds of the height from the gas mesh plate 4 to the vertical bottom of the gas cavity 1. Here, the gas mesh plate 4 referred to as "the height from the gas mesh plate 4 to the vertical bottom of the gas cavity 1" specifically refers to the horizontal position of the four peripheral edges of the gas mesh plate 4.

[0046] As shown in Figure 2 , the gas uniform plate 5 further comprises two extension edges 10, the length extension direction of the gas uniform plate 5 is consistent with the length extension direction of the gas cavity 1, the length extension direction of the two extension edges 10 is consistent with the length extension direction of the gas uniform plate 5, the two extension edges 10 are respectively located on the two sides of the width of the gas uniform plate 5, the extension edge 10 and the width extension direction of the gas uniform plate 5 are provided with an included angle, and the width extension direction of the extension edge 10 tends to be close to the vertical bottom of the gas cavity 1. The range of the included angle is within 30°-70°, the extension length of the extension edge 10 is within 1cm-8cm, which is specifically determined according to the volume of the combustion chamber, and the larger the volume, the greater the extension length of the extension edge 10.

[0047] As shown in Figure 2 , the gas uniform plate 5 is connected with the vertical bottom of the gas cavity 1 through the connecting plate 6, the connecting plate 6 is arranged at the two ends of the length direction of the gas uniform plate 5, and the connecting plate 6 and the gas inlet are arranged staggered in the length direction of the gas uniform plate 5. In order to ensure the smoothness of the gas flow in the combustion chamber as much as possible, the width of the connecting plate 6 is arranged to be relatively narrow (the length of the connecting plate 6 is fixed, that is, the setting height of the gas uniform plate 5), so as to avoid blocking the gas flow in a large area.

[0048] As shown in Figure 2 , the gas inlet is additionally provided with a flange structure at the connection with the gas inlet pipe 2, one end of the flange structure is communicated with the gas inlet through the inlet pipe, the other end of the flange structure is communicated with the gas inlet pipe 2, and the gas uniform sheet 7 is clamped between the two flange sheets of the flange structure. The cross-sectional shape of the flange structure is consistent with that of the gas inlet pipe 2, and the flange structure has two functions, one of which is to connect the gas inlet pipe 2 with the gas cavity 1, and the other of which is also the largest function of the flange structure in the present application, which is to solve the backfire and provide installation and fixation for the gas uniform sheet 7.

[0049] As shown in Figure 2As shown, the gas distribution plate 7 is provided with a plurality of uniformly distributed through holes, the flow direction of the through holes is consistent with the flow direction of the gas inlet pipe 2. The gas distribution plate 7 and the gas distribution plate 5 are cooperative means for solving the tempering, and are further means.

[0050] As shown in the drawings, the gas distribution plate 5 is provided with a plurality of uniformly distributed through holes, the flow direction of the through holes is consistent with the flow direction of the gas inlet pipe 2. The gas distribution plate 7 and the gas distribution plate 5 are cooperative means for solving the tempering, and are further means. Figure 2 As shown, the gas distribution plate 4 is an arc surface. The vertical bottom surface and the two width direction side surfaces of the gas cavity 1 are respectively provided with inclined transition plates 11. The arc surface of the gas distribution plate 4 can better increase the combustion area and provide more combustion heat. The inclined transition plates 11 are used to better ensure the smoothness of the gas flow in the combustion cavity.

[0051] As shown in the drawings, the gas distribution plate 5 is provided with a plurality of uniformly distributed through holes, the flow direction of the through holes is consistent with the flow direction of the gas inlet pipe 2. The gas distribution plate 7 and the gas distribution plate 5 are cooperative means for solving the tempering, and are further means. Figure 1 As shown, the gas distribution plate 4 is an arc surface. The vertical bottom surface and the two width direction side surfaces of the gas cavity 1 are respectively provided with inclined transition plates 11. The arc surface of the gas distribution plate 4 can better increase the combustion area and provide more combustion heat. The inclined transition plates 11 are used to better ensure the smoothness of the gas flow in the combustion cavity. As shown, the gas distribution plate 4 is an arc surface. The vertical bottom surface and the two width direction side surfaces of the gas cavity 1 are respectively provided with inclined transition plates 11. The arc surface of the gas distribution plate 4 can better increase the combustion area and provide more combustion heat. The inclined transition plates 11 are used to better ensure the smoothness of the gas flow in the combustion cavity. The connection ends of the press strips 9 are respectively inserted into the connection grooves, and the metal fiber mesh 3 is upwardly expanded under the action of the gas in the gas cavity 1. At this time, the expansion distance of the metal fiber mesh 3 is controlled within a certain range under the downward pressure of the press strips 9. The plurality of press strips 9 are distributed on the arc degree of the arc surface of the gas distribution plate 4, which can uniformly limit and press the whole metal fiber mesh 3. The connection grooves can also limit the displacement of the press strips 9 on the arc surface of the gas distribution plate 4. The limiting and pressing of the metal fiber mesh 3 by the press strips 9 is derived from the self-weight of the press strips 9.

[0052] The above are preferred embodiments of the present application, which do not limit the protection scope of the present application, therefore: any equivalent changes made on the structure, shape and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A large-sized metal fiber burner with anti-backfire, comprising a gas cavity (1) for containing gas, an air inlet pipe (2), a metal fiber net (3) and a gas net plate (4), an air inlet is formed on the gas cavity (1), the air inlet is communicated with the air inlet pipe (2), the metal fiber net (3) and the gas net plate (4) are respectively connected on one opening surface of the gas cavity (1), characterized in that: A gas equalization plate (5) is added to the inner cavity of the gas chamber (1). The surface area of ​​the gas equalization plate (5) is larger than the cross-sectional area of ​​the air inlet. The gas equalization plate (5) covers the air inlet. The surface area of ​​the gas equalization plate (5) is smaller than the cross-sectional area of ​​the gas chamber (1). The maximum surface of the gas equalization plate (5) is parallel to the opening surface of the gas chamber (1) where the metal fiber mesh (3) is located. ​ 2. A large metal fiber burner that prevents backfire according to claim 1, characterized in that: The air inlet is located at the vertical bottom of the gas chamber (1), the opening surface of the gas chamber (1) where the metal fiber mesh (3) is located is located at the vertical top of the gas chamber (1), and the gas mesh plate (4) is an arc-shaped surface.

3. A large metal fiber burner that prevents backfire according to claim 2, characterized in that: The horizontal cross-sectional area of ​​the gas chamber (1) is greater than the vertical cross-sectional area of ​​the gas chamber (1), and the gas equalization plate (5) is horizontally arranged inside the gas chamber (1).

4. A non-backfire large metal fiber burner according to claim 1 or 2 or 3, characterized in that: The distance from the gas equalization plate (5) to the vertical bottom of the gas chamber (1) is two-thirds of the height from the gas mesh plate (4) to the vertical bottom of the gas chamber (1).

5. A non-backfire large metal fiber burner according to claim 1 or 2 or 3, characterized in that: The gas equalizer (5) also includes two extension sides (10). The length extension direction of the gas equalizer (5) is consistent with the length extension direction of the gas chamber (1). The length extension direction of the two extension sides (10) is consistent with the length extension direction of the gas equalizer (5). The two extension sides (10) are located on both sides of the width of the gas equalizer (5). The extension side (10) and the width extension direction of the gas equalizer (5) are at an angle. The width extension direction of the extension side (10) tends to be close to the vertical bottom of the gas chamber (1).

6. A large metal fiber burner that prevents backfire according to claim 1, characterized in that: The gas equalizer (5) is connected to the vertical bottom of the gas chamber (1) via a connecting plate (6). The connecting plate (6) is located at both ends of the gas equalizer (5) along its length, and the connecting plate (6) and the air inlet are offset from each other along the length of the gas equalizer (5).

7. A large metal fiber burner that prevents backfire according to claim 1, characterized in that: A flange structure is added at the connection between the air inlet and the air inlet pipe (2). One end of the flange structure is connected to the air inlet through the inlet pipe, and the other end of the flange structure is connected to the air inlet pipe (2). A gas equalization plate (7) is sandwiched between the two flange plates of the flange structure.

8. A large metal fiber burner that prevents backfire according to claim 7, characterized in that: The gas distribution plate (7) has multiple evenly distributed through holes, and the flow direction of the through holes is consistent with the flow direction of the air inlet pipe (2).

9. A non-backfire large metal fiber burner according to claim 1, characterized in that: A pressure strip (9) is provided at the top of the gas chamber (1). There are multiple pressure strips (9), which are arranged in parallel on the outer side of the metal fiber mesh (3). The pressure strips (9) are provided with connecting ends at both ends in the length extension direction. Connecting grooves are provided at both ends in the length extension direction of the gas chamber (1). The connecting ends are slidably connected in the connecting grooves.

10. A non-backfire large metal fiber burner according to claim 1, characterized in that: An inclined transition plate (11) is provided between the vertical bottom surface of the gas chamber (1) and the two sides in the width direction.

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