CN210568421U

CN210568421U - Low-nitrogen combustor and gas device thereof

Info

Publication number: CN210568421U
Application number: CN201921242206.XU
Authority: CN
Inventors: 卢楚鹏; 张上兵; 李罗标; 潘同基; 唐元锋
Original assignee: Guangdong Vanward New Electric Co Ltd
Current assignee: Guangdong Vanward New Electric Co Ltd
Priority date: 2019-07-31
Filing date: 2019-07-31
Publication date: 2020-05-19
Anticipated expiration: 2029-07-31

Abstract

The utility model relates to a low-nitrogen burner and gas device thereof. The low-nitrogen combustor comprises a shell, wherein an injection channel, an air supply channel, a flow dividing channel and a diffusion mixing cavity are arranged in the shell, and the shell is also provided with a plurality of water flow channels which penetrate through the shell in the thickness direction; the gas inlet of the injection channel is used for introducing gas and air, the gas outlet end of the injection channel is communicated with the air supply channel through the flow dividing channel, the gas inlet of the air supply channel is used for introducing air, the gas outlet of the air supply channel is communicated with the diffusion mixing cavity, and the top of the shell is provided with a fire outlet communicated with the diffusion mixing cavity. The utility model discloses can effectively realize low nitrogen oxide and discharge, and the structure is simple relatively, does benefit to control.

Description

Low-nitrogen combustor and gas device thereof

Technical Field

The utility model relates to a low nitrogen combustor and gas device thereof, especially a low nitrogen combustor and gas device thereof that can realize low nitrogen oxide and discharge.

Background

Most of the existing burner technologies are ordinary atmospheric burners, NO_XThe emission of gas (nitrogen oxide) is high, which is not beneficial to the low-nitrogen environmental protection emission requirement, the gas water heater and the gas wall hanging stove in European countries have enforced the low-nitrogen oxide emission requirement at present, and the domestic development towards the low-nitrogen emission direction in the near future can be expected. The existing industry adopts the dense-dilute combustion technology to realize low nitrogen oxide emission, but most of the existing dense-dilute combustors adopt a structure with double ejectors, for example, a low-nitrogen combustor disclosed in the Chinese patent application No. 201610526887.7 comprises a mixer and the like, wherein the mixer comprises a cylinder body and an inner cylinder, and a combustion-supporting air swirl sheet, an air inlet cylinder, a swirl impeller and the like are arranged on the inner cylinder to ensure uniform combustion and realize low nitrogen oxide emission.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to consider one of the above-mentioned problems and provide a low nitrogen combustor and gas device thereof, the utility model discloses can effectively realize low nitrogen oxide and discharge, and the structure is simple relatively, does benefit to control.

The technical scheme of the utility model is that: the utility model discloses a low-nitrogen burner, which comprises a shell, wherein the shell is internally provided with an injection channel, an air supply channel, a flow dividing channel and a diffusion mixing cavity, and the shell is also provided with a plurality of water flow channels which are arranged in a penetrating way along the thickness direction; the gas inlet of the injection channel is used for introducing gas and air, the gas outlet end of the injection channel is communicated with the air supply channel through the flow dividing channel, the gas inlet of the air supply channel is used for introducing air, the gas outlet of the air supply channel is communicated with the diffusion mixing cavity, and the top of the shell is provided with a fire outlet communicated with the diffusion mixing cavity.

The utility model discloses a gas device, including above-mentioned low nitrogen combustor.

The utility model is provided with an injection channel, a gas nozzle is correspondingly arranged at the air inlet of the injection channel during the concrete work, the injection channel provides air-fuel mixture for the diffusion mixing cavity through an air supply channel, the air supply channel additionally provides air for the diffusion mixing cavity for full premixing, and the fully-mixed premixed gas realizes the combustion at the fire outlet, thereby ensuring the full combustion and utilization of fuel, reducing the emission of CO and simultaneously realizing the emission of low nitrogen oxide; through setting up rivers passageway and supplying cooling circulation of water or delivery pipe setting, utilize cold water to carry out the high heat that produces because of the burning in the effective absorption combustor, effectively reduce the combustion temperature of the burning zone of fire outlet department to can further reduce the yield of NO, simultaneously because cold water has absorbed the surface temperature of casing in advance, reduce fuel combustion energy loss, thereby effectively improve energy conversion efficiency, effectively realized energy saving and emission reduction. Because only one injection channel is adopted, only one gas nozzle (the work of which needs to be controlled by a circuit) is needed in specific use, and compared with a plurality of injection channels and a plurality of corresponding gas nozzles, the gas-fuel injector has the advantages of relatively simple circuit program control and high reliability. The utility model discloses can effectively realize low nitrogen oxide and discharge, and the structure is simple relatively, does benefit to control.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

fig. 2 is a front view of the burner of the present invention;

fig. 3 is a top view of the burner of the present invention;

FIG. 4 is a cross-sectional view M-M of FIG. 2;

fig. 5 is a schematic view of another design structure of the fire hole in the burner of the present invention.

Detailed Description

With reference to fig. 1 to 4, a low-nitrogen burner includes a casing 100, the casing 100 is provided with an injection passage 1, flow dividing passages (11, 12), air supply passages (21, 22), and a diffusion mixing chamber 3, and the casing 100 is further provided with three water flow passages 5 penetrating through the thickness direction; the gas inlet of the injection channel 1 is used for introducing gas and air, the gas outlet end of the injection channel 1 is communicated with the air supply channels (21, 22) and the diffusion mixing cavity 3 through the flow dividing channels (11, 12), the gas inlets of the air supply channels (21, 22) are used for introducing air, the gas outlets of the air supply channels (21, 22) are communicated with the diffusion mixing cavity 3, and the top of the shell 100 is provided with a fire outlet 6 communicated with the diffusion mixing cavity 3.

The utility model discloses be equipped with one and draw and penetrate passageway 1, the air inlet correspondence that draws and penetrate passageway 1 sets up the gas nozzle at concrete during operation, draw and penetrate passageway 1 and directly provide the air-fuel mixture for diffusion hybrid chamber 3 and provide the air-fuel mixture for diffusion hybrid chamber 3 through air supply passageway (21, 22), air supply passageway (21, 22) carry out fully premixed for diffusion hybrid chamber 3 additionally provides the air, the premixed gas of fully mixed realizes the burning in 6 departments of fire outlet, thereby guarantee the abundant burning utilization of fuel, both reduce CO and discharge, can realize low nitrogen oxide emission simultaneously again. Through setting up rivers passageway 5 and supplying cooling circulation of water or delivery pipe setting, utilize cold water to carry out the high heat that produces because of the burning in the effective absorption combustor, effectively reduce the combustion temperature of the combustion zone of 6 departments of a fire outlet to can further reduce the yield of NO, simultaneously because cold water has absorbed the surface temperature of casing in advance, reduce fuel combustion energy loss, thereby effectively improve energy conversion efficiency, effectively realized energy saving and emission reduction. Because only one injection channel is adopted, only one gas nozzle (the work of which needs to be controlled by a circuit) is needed in specific use, and compared with a plurality of injection channels and a plurality of corresponding gas nozzles, the gas-fuel injector has the advantages of relatively simple circuit program control and high reliability. The utility model discloses can effectively realize low nitrogen oxide and discharge, and the structure is simple relatively, does benefit to control.

In other embodiments, the number of the water flow passages 5 is not limited to 3, and may be 2 or a natural number greater than 3.

In one embodiment, the injection passage 1 is designed by adopting an injector structure in the technical field of combustion, and therefore, the injection passage 1 is provided with a gas suction contraction section 113, a mixing section 112 and a diffusion section 111 which are sequentially arranged along the airflow direction. The diffusion section 111 of the injection passage 1 serves as an air outlet end.

In one embodiment, the injection passage 1 extends from the bottom end surface of the casing 100 to the top direction, and the air inlet of the injection passage 1 is located on the bottom end surface of the casing 100. Preferably, the air supply passages (21, 22) also extend from the bottom end surface of the housing 100 to the top direction, and the air inlets of the air supply passages (21, 22) are located on the bottom end surface of the housing 100. Considering gas device's service environment, especially under the strong air current that fan work formed, all being located the bottom terminal surface of casing 100 with drawing the air inlet of penetrating passageway 1, the air inlet of air supply passageway (21, 22), the passageway extends the setting toward the top direction, and the inside air current of this combustor is more stable, ensures that the combustion condition is stable.

Of course, the injection passage 1 may have other designs, for example, the air inlet of the injection passage 1 may be disposed on the side surface of the housing 100 and may extend in an L-shape. The air supply channels (21, 22) may be designed in other ways, for example, the air inlets of the air supply channels (21, 22) are arranged in the middle of the casing 100 or on the side of the casing 100, or the air supply channels (21, 22) protrude from the air inlet of the injection channel 1 toward the bottom of the casing 100.

In one embodiment, the flow dividing channels (11, 12) extend from the air inlets to the top of the housing 100; the cross-sectional area of the flow dividing channels (11, 12) is gradually increased along the direction of the air inlet pointing to the air outlet. The scheme limits the extension mode and the size change mode of the branch passages (11 and 12), on one hand, the air-fuel mixture can flow to the diffusion mixing cavity 3 more smoothly, on the second hand, the air-fuel mixture can be further mixed in the branch passages (11 and 12), and the mixing effect is better.

In one embodiment, from the viewpoint of more reasonable flow and mixing, the cross-sectional area of the air outlet of the flow dividing channel is 1.5 to 4.5 times that of the air inlet of the flow dividing channel. Preferably, the cross-sectional area of the air outlet of the flow dividing channel (11, 12) is 2.5 times that of the air inlet of the flow dividing channel (11, 12).

In one embodiment, the air supply channel (21, 22) is provided with a conveying section (212, 222) and a diffusion section (211, 221) which are sequentially arranged along the airflow direction, and any section of the diffusion section (211, 221) of the air supply channel (21, 22) is larger than any section of the conveying section (212, 222) of the air supply channel (21, 22); the air outlets of the flow dividing passages (11, 12) are communicated with the diffusion sections (211, 221) of the air supply passages (21, 22). According to the scheme, the air outlets of the flow dividing channels (11 and 12) are arranged at the diffusion sections of the air supply channels (21 and 22), so that the introduction of air is facilitated, and the full mixing of air-fuel mixture and air is facilitated.

More specifically, it is preferable that the inner diameters of the conveyance stages (212, 222) and the diffuser stages (211, 221) are both gradually increased from the gas flow direction, and the change rate of the inner diameters of the diffuser stages (211, 221) is larger than the change rate of the inner diameters of the conveyance stages (212, 222). The scheme is favorable for the flow and diffusion of air.

In one embodiment, the air supply duct (21, 22) is further provided with a horn input section (213, 223) located in front of the conveying section (212, 222) in the direction of the air flow, the air inlet of the horn input section (213, 223) being the air inlet of the air supply duct (21, 22). The scheme is designed according to the structure of the ejector so as to better introduce air. However, the air supply passages (21, 22) are used for introducing air and are not used in combination with the gas nozzles, and therefore, the design of the sections of the air supply passages (21, 22) does not correspond to the design parameters of the injectors.

Since the burner is generally disposed in a similar rectangular body, in order to make the combustion uniform and sufficient, the housing 100 is provided with two air supply passages: a first air supply passage 21, and a second air supply passage 22. The first air supply channel 21 and the second air supply channel 22 are symmetrically arranged at two sides of the injection channel 1, and air outlets of the first air supply channel 21 and the second air supply channel 22 are respectively communicated with two sides of the bottom of the diffusion mixing cavity 3. Correspondingly, in other embodiments, the casing 100 may be provided with more air supply passages on two sides of the injection passage 1, and it is more reasonable to symmetrically provide the air supply passages on two sides of the injection passage 1 in consideration of the smoothness of the air path flow and the uniformity of the air-fuel mixture.

The housing 100 has two diversion channels: a first diversion channel 11 and a second diversion channel 12. The first diversion channel 11 and the second diversion channel 12 are symmetrically arranged on two sides of the injection channel 1, the first diversion channel 11 is correspondingly communicated with the first air supply channel 21, and the second diversion channel 12 is correspondingly communicated with the second air supply channel 22. Correspondingly, in other embodiments, the casing 100 may be provided with more flow dividing channels on two sides of the air outlet end of the injection channel 1, and it is more reasonable to symmetrically provide flow dividing channels on two sides of the air outlet end of the injection channel 1 in consideration of the smoothness of air path flow and the mixing uniformity of air-fuel mixture.

In one embodiment, a plurality of water flow passages 5 are located between the diffusion mixing chamber 3 and the injection passage 1 along the direction from the bottom to the top of the casing 100. The scheme can better absorb the heat of the burner by limiting the reasonable position of the water flow channel 5, and does not influence the design of the diffusion mixing cavity 3.

In one embodiment, the top end surface of the housing 100 is provided with a plurality of fire outlets 6, the fire outlets 6 are arranged at equal or unequal intervals, and the width of each fire outlet 6 is 0.4-1.5mm, and the length of each fire outlet 6 is 4-15 mm. The fire outlet 6 can be a plane structure, and can also be other structures. As shown in fig. 5, the longitudinal cross-sectional shape of the fire outlet 6 is a "V" structure; the fire outlet 6 with the V-shaped structure can enable the flame to gather more and further reduce the combustion sound.

In this context, several means two, three or four or more in number.

In one embodiment, the housing 100 is further provided with a plurality of profiling molds 7 corresponding to the diffusion mixing chamber 3. The profiling 7 is a groove towards the outer side to the inner side of the shell 100, the profiling 7 is beneficial to improving the strength of the shell 100, and the premixed gas of the diffusion mixing cavity 3 can be more uniformly distributed, so that the flame height, the air flow speed, the CO and the NO of the fire outlet 6 can be realized_XThe discharge is more uniform.

In one embodiment, the side wall surface of the fire outlet 6 is provided with a catalyst, and the catalyst is noble metal or transition metal hydride or transition metal oxide; the catalyst can effectively reduce the activity of the gas-air mixtureThe energy is converted, simultaneously, the molecules of the mixture can be enriched on the surface of the side wall of the fire outlet 6, thereby improving the reaction speed and accelerating the combustion rate, and the organic waste gas can be flameless combusted under the condition of lower ignition temperature by virtue of the catalyst and is oxidized and decomposed into CO₂And H₂And O, low CO and even zero CO emission is realized, and a large amount of heat is released, so that the aims of energy conservation and emission reduction are fulfilled.

In one embodiment, the housing 100 includes a first side wall 101, an intermediate connecting portion 102, and a second side wall 103 sequentially disposed on the same board; the first intermediate connecting portion 102 is provided with the fire outlet 6; the first side wall part 101 and the second side wall part 103 are punched with the same channel structure and a concave structure which is concave from the inner side to the outer side; the first side wall portion 101 and the second side wall portion 103 are bent along both sides of the intermediate connecting portion 102 and are attached to each other in opposite directions, the injection passage 1, the flow dividing passages (11, 12), the diffusion mixing chamber 3, and the air supply passages (21, 22) are formed by the recessed structure, and the water flow passage 5 is formed by the passage structure. This solution gives an implementation structure of the casing 100 which facilitates a simplified production process.

The utility model discloses the theory of operation of combustor as follows: the arrow direction in the figure represents the gas flowing direction, the gas is firstly ejected from the nozzle of the ejection channel 1, the gas flows in through the gas and air mixed air inlet 11 of the ejection channel 1, the gas entrains air around the gas and air mixed air inlet 11 and enters the ejection channel 1, the gas and the air are preliminarily premixed in the ejection channel 1 and then flow into the first diversion channel 11 and the second diversion channel 12, the mixed gas of the first diversion channel 11 and the second diversion channel 12 is further mixed and then flows into the first air supply channel 21 and the second air supply channel 22, the mixed gas and the air are fully mixed and then flow into the diffusion mixing cavity 3, the mixed gas is further mixed in the diffusion mixing cavity 3, the fully mixed premixed gas flows into the fire outlet 6 to realize full combustion, and the emission of CO and NOX can be effectively reduced.

In one embodiment, a gas-fired device comprises the low-nitrogen burner of any of the above embodiments. The gas device may be a gas water heater or a wall-mounted stove.

Gas device, compare produced beneficial effect with the background art: the technical effect of the low-nitrogen combustor is brought by the low-nitrogen combustor, and the beneficial effect of the low-nitrogen combustor is the same as that of the low-nitrogen combustor, so that the description is omitted.

In the description of the present invention, it is to be understood that the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.

In the description of the present invention, it is to be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly connected" to another element, there are no intervening elements present.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A low-nitrogen burner is characterized by comprising a shell, wherein an injection channel, an air supply channel, a flow distribution channel and a diffusion mixing cavity are arranged in the shell, and the shell is also provided with a plurality of water flow channels which penetrate through the shell along the thickness direction; the gas inlet of the injection channel is used for introducing gas and air, the gas outlet end of the injection channel is communicated with the air supply channel through the flow dividing channel, the gas inlet of the air supply channel is used for introducing air, the gas outlet of the air supply channel is communicated with the diffusion mixing cavity, and the top of the shell is provided with a fire outlet communicated with the diffusion mixing cavity.

2. The low-nitrogen burner of claim 1, wherein the flow dividing channel extends from the inlet port toward the top of the housing; the cross-sectional area of the flow dividing channel gradually increases along the direction of the air inlet pointing to the air outlet.

3. The low-nitrogen burner of claim 2, wherein the cross-sectional area of the outlet of the flow dividing channel is 1.5 to 4.5 times the cross-sectional area of the inlet of the flow dividing channel.

4. The low-nitrogen combustor according to claim 1, wherein the air supply channel is provided with a conveying section and a diffuser section which are sequentially arranged along the airflow direction, and any section of the diffuser section of the air supply channel is larger than any section of the conveying section of the air supply channel; the air outlet of the flow dividing channel is communicated with the diffusion section of the air supply channel.

5. The low-nitrogen combustor according to claim 4, wherein the inner diameter of the delivery section and the inner diameter of the diffuser section are gradually increased from the gas flow direction, and the change rate of the inner diameter of the diffuser section is greater than that of the delivery section.

6. The low-nitrogen burner of claim 1, wherein a plurality of water flow passages are located between the diffusion mixing chamber and the injection passage in a direction from the bottom of the housing toward the top.

7. The low-nitrogen burner of claim 1, wherein the housing has two air supply passages and two diversion passages, the two air supply passages and the two diversion passages are symmetrically disposed on two sides of the injection passage, air outlets of the two air supply passages are respectively communicated with two sides of the bottom of the diffusion mixing chamber, and the two diversion passages are communicated with the two air supply passages in a one-to-one correspondence manner.

8. The low-nitrogen burner as claimed in claim 1, wherein the longitudinal cross-sectional shape of the fire outlet is a "V" structure.

9. The low-nitrogen burner of claim 1, wherein the housing includes a first side wall portion, an intermediate connecting portion, and a second side wall portion sequentially provided on the same plate; the first middle connecting part is provided with the fire outlet; the first side wall part and the second side wall part are stamped with the same channel structure and a sunken structure sunken from the inner side to the outer side; the first side wall portion and the second side wall portion are bent along two sides of the middle connecting portion and are attached in opposite directions, the injection channel, the diffusion mixing cavity, the flow dividing channel and the air supply channel are constructed through the concave structure, and the water flow channel is constructed through the channel structure.

10. A gas-fired device, characterized in that it comprises a low-nitrogen burner as claimed in any one of claims 1 to 9.