CN114459025A

CN114459025A - Combustor and gas equipment

Info

Publication number: CN114459025A
Application number: CN202011206873.XA
Authority: CN
Inventors: 钱晓林; 梁泽锋
Original assignee: Midea Group Co Ltd; Wuhu Midea Kitchen and Bath Appliances Manufacturing Co Ltd
Current assignee: Midea Group Co Ltd; Wuhu Midea Kitchen and Bath Appliances Manufacturing Co Ltd
Priority date: 2020-10-30
Filing date: 2020-10-30
Publication date: 2022-05-10

Abstract

The invention discloses a combustor and gas equipment, wherein the combustor comprises a shell, a preheating combustor, a first premixer and a second premixer, wherein a combustion chamber is formed in the shell; the preheating burner is used for igniting the mixed gas so as to heat the temperature in the combustion chamber to a preset temperature; the first premixer is used for providing mixed gas with set proportion to the preheating combustor; the second premixer is formed with a mixing cavity for respectively connecting gas and air and mixing, and injecting the mixed gas to the combustion chamber, so that high-temperature air combustion reaction is carried out in the combustion chamber. In the invention, a first premixer provides mixed gas with a set proportion to a preheating combustor; after the mixed gas is ignited by the preheating burner, high-temperature flue gas is generated in the combustion chamber; the second premixer mixes the fuel gas and air and sprays the mixed gas to the combustion chamber, and the sprayed mixed gas is matched with the high-temperature flue gas to generate a entrainment effect, so that uniform and mild combustion is realized.

Description

Combustor and gas equipment

Technical Field

The invention relates to the technical field of high-temperature air combustion, in particular to a combustor and gas equipment.

Background

High temperature air combustion (high temperature air combustion) technology is a MILD combustion mode under low oxygen dilution conditions, also known as MILD combustion. The main combustion characteristics are as follows: low reaction rate, less local heat release, uniform heat flow distribution, low combustion peak temperature, low noise and the like. Because the MILD combustion temperature field is more uniform, the combustion peak temperature is low, the generation of thermal nitrogen oxides is reduced, and compared with a common combustion mode, the emission of pollutants NOx and CO can be greatly reduced.

Although high temperature air combustion has many of the advantages described above, it is currently an industrial application and is not used in everyday life.

Disclosure of Invention

The invention mainly aims to provide a combustor with a high-temperature air combustion function and gas equipment.

To achieve the above object, the present invention provides a burner comprising:

a housing formed with a combustion chamber;

a preheating burner for igniting the mixed gas to heat a temperature within the combustion chamber to a preset temperature;

the first premixer is used for providing mixed gas with a set proportion to the preheating combustor; and the number of the first and second groups,

and the second premixer is provided with a mixing cavity which is used for respectively connecting gas and air and mixing the gas and injecting the mixed gas into the combustion chamber, so that high-temperature air combustion reaction is carried out in the combustion chamber.

In one embodiment, the first premixer comprises a casing and a first fan, the casing is formed with an air inlet channel, a fuel gas channel and a mixing channel, and the mixing channel is respectively communicated with the air inlet channel and the fuel gas channel;

wherein, first fan is located mixing channel.

In an embodiment, the second premixer comprises an air inlet pipeline, a gas pipeline and a second fan, and the mixing cavity is respectively communicated with the air inlet pipeline and the gas pipeline;

wherein, the second fan is arranged on the air inlet pipeline.

In an embodiment, the second premixer further includes a housing forming the mixing chamber, the housing being removably connected to the second fan.

In one embodiment, a plurality of injection ports are arranged at intervals on the side of the combustion chamber, and the mixing cavity injects mixed gas to the combustion chamber through the injection ports.

In one embodiment, the combustor further comprises a gas distribution structure, and the second premixer is in one-to-one correspondence communication with the plurality of injection ports through the gas distribution structure.

In one embodiment, the gas distribution structure is formed with a gas distribution cavity, the gas distribution cavity comprises a first chamber and a second chamber which are sequentially communicated, an air inlet of the first chamber is communicated with the second premixer, and an air outlet of the second chamber is communicated with the combustion chamber;

the second chamber is arranged along the gas flowing direction in a gradually expanding mode.

In one embodiment, the housing further forms a gas distribution chamber in communication with the first premixer and the combustion chamber, respectively;

the preheating burner comprises a combustion assembly arranged at the air outlet of the air distribution chamber.

In one embodiment, the plenum chamber has an inlet chamber section arranged adjacent to the first premixer, the inlet chamber section having a gradually increasing aeration area in the gas flow direction.

In an embodiment, the combustion assembly comprises a metal fiber mesh.

In one embodiment, the housing includes a first housing forming the distribution chamber and a second housing forming the combustion chamber, the first housing being removably connected to the second housing.

In an embodiment, the outer peripheral side of the metal fiber web is clamped and limited at the connection between the first shell and the second shell.

In an embodiment, the burner further includes a gas assembly, the gas assembly includes an inlet duct and a gas proportional valve, the inlet duct is respectively communicated with the first and second pre-mixers, and the gas proportional valve is used for respectively adjusting gas flow rates of the first and second pre-mixers.

In one embodiment, the preheat burner is a fully premixed burner.

In addition, in order to achieve the above purpose, the present invention further provides a gas appliance, which includes a heat exchanger and the burner as described above, wherein the heat exchanger produces hot water by using heat generated by the burner.

In an embodiment, the gas appliance comprises a gas water heater or a gas wall-hanging stove.

In the technical scheme provided by the invention, a first premixer provides mixed gas with a set proportion to a preheating combustor; after the mixed gas is ignited by the preheating burner, high-temperature flue gas is generated in the combustion chamber; the second premixer mixes gas and air and sprays the mixed gas to the combustion chamber, and the sprayed mixed gas is matched with the high-temperature flue gas to generate entrainment effect, so that the high-temperature flue gas flows back, the temperature of the combustion chamber can be kept, the gas in the combustion chamber can be spontaneously combusted, the air can be diluted, the oxygen concentration in the combustion chamber is lower than a set value, and uniform and mild combustion is realized.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic front view of an embodiment of a combustor provided by the present invention;

FIG. 2 is an enlarged schematic view of the structure at A in FIG. 1;

FIG. 3 is a schematic side cross-sectional view of the combustor of FIG. 1;

fig. 4 is an enlarged schematic view of a portion B in fig. 3.

The reference numbers illustrate:

the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention aims to design a novel burner by utilizing the combustion characteristic of high-temperature air and apply the novel burner to gas equipment, so that the gas equipment can effectively reduce the emission of CO and NOx and reduce the noise of the gas equipment.

The invention provides a burner which is applied to gas equipment and related products and equipment such as gas wall-mounted furnaces and the like which use high-temperature hot water generated by burning gas to carry out household bathing, heating and the like. Fig. 1 to 4 show an embodiment of a burner according to the present invention.

Referring to fig. 1 to 4, a combustor according to the present invention includes a casing 100, a preheating combustor 110, a first premixer 120, and a second premixer 130, wherein the casing 100 forms a combustion chamber 101; the preheating burner 110 is used for igniting the mixed gas to heat the temperature in the combustion chamber 101 to a preset temperature; the first premixer 120 is used for providing a set proportion of mixed gas to the preheating burner 110; the second premixer 130 is formed with a mixing cavity 131, and the mixing cavity 131 is used for respectively receiving and mixing gas and air, and injecting the mixed gas into the combustion chamber 101, so that a high-temperature air combustion reaction is performed in the combustion chamber 101.

In the technical scheme provided by the invention, the first premixer 120 provides mixed gas with a set proportion to the preheating combustor 110; after the mixed gas is ignited by the preheating burner 110, high-temperature flue gas is generated in the combustion chamber 101; the second premixer 130 mixes the fuel gas and the air and injects the mixed gas into the combustion chamber 101, and the injected mixed gas and the high-temperature flue gas cooperate to generate a entrainment effect, so that the high-temperature flue gas flows back, the temperature of the combustion chamber 101 can be maintained, the fuel gas in the combustion chamber 101 can be combusted, the air can be diluted, the oxygen concentration in the combustion chamber 101 is lower than a set value, and uniform and mild combustion is realized.

The preheating burner 110 may be in various forms according to actual requirements, such as a fully premixed burner or a partially premixed burner, and in consideration of the fact that the partially premixed burner has high CO and NOX emission and large heat loss due to a large excess air ratio, the preheating burner 110 is exemplified as the fully premixed burner in the following embodiments.

The first premixer 120 provides the mixed gas to the preheating burner 110, and the preheating burner 110 heats the temperature inside the combustion chamber 101 to a preset temperature by igniting the combustion gas. It can be understood that the purpose of the preheating burner 110 is to achieve high-temperature preheated air, the target temperature of the high-temperature preheated air cannot be too low and cannot be lower than 600 degrees celsius as much as possible, and generally, the high-temperature preheated air is controlled at 600 to 1200 degrees celsius to ensure that when the high-temperature gas contacts with the fuel gas in the combustion chamber 101, good automatic combustion is achieved, and ignition are no longer needed. The scheme for preheating the air at a high temperature may be various, and for example, the scheme may be implemented by controlling the heating time, controlling the ratio of the fuel gas to the air, performing heat preservation, increasing the residence time of the high-temperature gas in the combustion chamber 101, and the like.

The second premixer 130 injects the mixture gas into the combustion chamber 101. The second premixer 130 may be provided to include a nozzle 143 provided to communicate with the combustion chamber 101, and the purpose of injecting the mixed gas into the combustion chamber 101 may be achieved by providing the second premixer 130 to reduce the flow area at the nozzle 143, or providing the second premixer 130 to increase the flow rate of the gas flow provided at the nozzle 143.

After the mixed gas is injected into the combustion chamber 101, the mixed gas is matched with high-temperature preheated air in the combustion chamber 101 to generate a entrainment effect, so that high-temperature flue gas continuously flows back in the combustion chamber 101. The circulating reflux of the high-temperature flue gas can play a role in heat preservation on the combustion chamber 101, so that the temperature in the combustion chamber 101 is higher than the spontaneous combustion point of the fuel, and the spontaneous combustion of the fuel is realized; the circulation reflux of the high-temperature flue gas can also absorb dilution air through jet flow entrainment, so that the oxygen concentration in the combustion chamber 101 is lower than a certain value, uniform combustion is realized, and the purpose of high-temperature air combustion is achieved.

It should be noted that, the structure of the above-mentioned burner frame can miniaturize the components for realizing high-temperature air combustion, so that more application space and value are provided, the noise is low, the combustion is sufficient, the pollution of the discharged waste gas is small, when the burner frame is applied to a gas water heater and related products and equipment which are used for household bathing, heating and the like by using high-temperature hot water generated by gas combustion including a gas wall-mounted furnace and the like, the requirements are met, and the effects of sufficient combustion and low pollutant discharge which are not provided by the burner in the existing water heater are also brought.

In the above, the oxygen concentration in the combustion chamber 101 needs to be lower than a certain value, and specifically, may be set to be lower than 5% to 10%. The oxygen concentration in the combustion chamber 101 can be achieved by adjusting the ratio of the fuel gas to the air in the second premixer 130, for example, when the fuel gas amount is constant, the oxygen concentration in the combustion chamber 101 can be adjusted by adjusting the real-time intake air amount in the combustion chamber 101, thereby achieving control of the ratio of the fuel gas to the air. The oxygen concentration in the combustion chamber 101 can be controlled according to the size of the combustion chamber 101 and the control injection speed.

As can be seen from the above, the ratio of the fuel gas to the air in the mixed gas discharged from the first premixer 120 can be controlled, which contributes to better achieving high-temperature air combustion in the combustion chamber 101. Therefore, in an embodiment, the first premixer 120 includes a casing and a first fan 124, the casing is formed with an air inlet channel 121, a gas channel 122 and a mixing channel 123, and the mixing channel 123 is respectively communicated with the air inlet channel 121 and the gas channel 122; wherein, the first fan 124 is disposed on the mixing channel 123. The air inlet duct 121 is used for receiving external air, the gas duct 122 is used for receiving external gas, the external air and the external gas are mixed in the mixing channel 123, and the air outlets of the mixing channel 123 are respectively and correspondingly communicated to the preheating burner 110. After the external air and the external fuel gas enter the mixing channel 123, the external air and the external fuel gas still circulate in the form of two air flows to a certain extent, or only part of air flows are mixed, so that the first fan 124 is arranged at the mixing channel 123, the two air flows in the mixing channel 123 can be disturbed through the rotation of the fan blades in the first fan 124, that is, the external air and the external fuel gas are fully scattered, and the external air and the external fuel gas are fully mixed. In addition, the rotation of the fan blades in the first fan 124 can also drive the circulation of the gas in the mixing channel 123, so that the mixed gas can be accelerated to enter the preheating burner 110, and the working efficiency of the burner can be improved to a certain extent.

It should be noted that, since the second pre-mixer 130 is used for injecting the mixed gas into the combustion chamber 101, the requirement for the ratio between the gas and the air is lower than that of the first pre-mixer 120, in the present embodiment, the mixing between the external air and the external gas can be realized by providing a mixing cavity 131. Specifically, the second premixer 130 includes an air inlet duct 132, a gas duct 133 and a second fan 134, and the mixing chamber 131 is respectively communicated with the air inlet duct 132 and the gas duct 133; wherein, the second fan 134 is disposed on the air inlet duct 132. In practical use, since the first fan 124 is disposed at the mixing passage 123 in the first premixer 120, in order to improve safety, the first premixer 120 has certain limitations on the type of the first fan 124, for example, a dedicated explosion-proof fan is generally selected, which increases the cost of the first premixer 120 to some extent; in the embodiment, the second fan 134 is disposed at the air inlet duct 132, which helps to reduce the requirement for the second fan 134, thereby helping to save cost. The second fan 134 is arranged to adjust the specific air intake of the air intake duct 132 by adjusting the rotation speed of the fan blades in the second fan 134, so as to adjust the ratio of the fuel gas to the air in the mixing chamber 131.

In one embodiment, the second premixer 130 further includes a housing forming the mixing chamber 131, the housing being detachably connected to the second fan 134. The second fan 134 is fixedly mounted on the housing and acts on the air inlet pipe 132, so that the external air can be driven to the mixing cavity 131, the ratio of the air and the air in the mixing cavity 131 can be adjusted, and meanwhile, the second fan 134 can be stably mounted relative to the second premixer 130, and the second fan 134 is prevented from colliding and making a sound due to unstable mounting.

Since the first pre-mixer 120 is provided with the gas flow passage 122, and the second pre-mixer 130 is provided with the gas pipe 133, in an embodiment, a gas source may be respectively provided for the gas flow passage 122 and the gas pipe 133, and a regulating valve is respectively provided at the gas flow passage 122 and the gas pipe 133, and the gas flow of the gas flow passage 122 and the gas pipe 133 is controlled by respectively regulating the opening degrees of the two regulating valves.

Or in an embodiment, the burner further includes a gas burning assembly 150, the gas burning assembly 150 includes a gas inlet pipe 151 and a gas burning proportional valve 152, the gas inlet pipe 151 is respectively communicated with the gas flow passage 122 and the gas burning pipe 133, and the gas burning proportional valve 152 is used for respectively adjusting the gas amount of the gas burning flow passage 122 and the gas burning pipe 133. An air inlet of the air inlet pipeline 151 is used for being communicated with a gas source, an air outlet of the air inlet pipeline 151 is respectively communicated with the gas flow passage 122 and the gas pipeline 133, and the gas proportional valve 152 can adjust the gas flow from the air inlet pipeline 151 to the gas flow passage 122 or the gas pipeline 133, so that the gas amount in the first pre-mixer 120 and the second pre-mixer 130 can be adjusted, and the proportion of gas and air can be adjusted and controlled.

In order to achieve the purpose of injecting the mixed gas into the combustion chamber 101, in an embodiment, the second premixer 130 may further include an injection pipe, one end of the injection pipe is communicated with the mixing channel 123, the other end of the injection pipe is connected to the above-mentioned nozzle 143, the injection pipe extends into the combustion chamber 101, and the state and effect of the high-speed jet flow can be specifically adjusted by adjusting the installation position and the extending depth of the injection pipe. For example, the injection tube may run along the central axis of the combustion chamber 101.

Or in an embodiment, a plurality of injection ports are arranged at intervals on the side of the combustion chamber 101, and the second premixer 130 injects the mixed gas into the combustion chamber 101 through the injection ports.

It should be noted that the second premixer 130 includes a nozzle 143, and the nozzle 143 may be installed at the injection port, or a communication between the nozzle 143 and the combustion chamber 101 directly constitutes the injection port.

The specific arrangement mode of the plurality of injection ports is not limited, and in specific application, the plurality of injection ports can be arranged at intervals along the circumferential direction of the combustion chamber 101, so that high-speed jet flow can be performed on high-temperature flue gas in the combustion chamber 101 from multiple directions, and the circulating reflux of the high-temperature flue gas is enhanced; or after the plurality of injection ports form one injection port group, at least two injection port groups are arranged on two opposite sides of the combustion chamber 101, so that airflow is injected in opposite directions to intensify the convection of the flue gas in the combustion chamber 101.

The opening orientation of each of the plurality of ejection ports is also not limited. According to actual needs, the opening orientations of the plurality of injection ports may be arranged identically or at least partially differently. In one embodiment, when the plurality of injection ports are arranged at intervals in the circumferential direction of the combustion chamber 101, the openings of all the injection ports may be oriented toward the central axis of the combustion chamber 101; or, all the injection ports may be arranged obliquely along the same side of the circumferential direction of the combustion chamber 101, so that the airflow injected from the plurality of injection ports is in a vortex shape, and the high-temperature flue gas returning after entrainment is in a vortex shape, which is beneficial to prolonging the return path of the high-temperature flue gas, enhancing the circulating return effect of the flue gas in the combustion chamber 101, and realizing good heat preservation in the combustion chamber 101.

Based on the above, when the injection port is provided with a plurality of injection ports, in an embodiment, the combustor further includes a gas distribution structure 140, and the second premixer 130 is in one-to-one correspondence communication with the plurality of injection ports through the gas distribution structure 140. In this way, a synchronous, homogeneous jet flow of a plurality of injection openings can be achieved by means of one second premixer 130.

Specifically, the air distribution structure 140 is formed with an air distribution chamber, an air inlet of the air distribution chamber is communicated with an air outlet of the second premixer 130, and the air outlet of the air distribution chamber is provided in a plurality corresponding to the plurality of injection ports. The setting of branch air cavity can provide sufficient space and circulation route and supply the mist to further mix, and can slowly release the kinetic energy of the mist after the fan drives for the mist is more even and get into nozzle 143 department steadily from the gas distribution cavity.

Further, in an embodiment, the air distribution chamber includes a first chamber 141 and a second chamber 142 which are sequentially communicated, an air inlet of the first chamber 141 is communicated with the second premixer 130, and an air outlet of the second chamber 142 is communicated with the combustion chamber 101; the second chamber 142 is disposed in a gradually expanding manner along the gas flowing direction. It will be appreciated that the smaller flow area of the first chamber 141 than the second chamber 142 helps to increase the flow rate of the gas stream entering the gas-splitting chamber from the second premixer 130; the second chamber 142 is the gradually-expanding setting along the gas flow direction, and the flow area of the second chamber 142 is gradually increased along the gas flow direction, so that the flow rate of the mixed gas in the second chamber 142 is gradually gentle and gradually dispersed, and the mixed gas sprayed by each nozzle 143 is uniform and stable.

In view of the above, several injection ports of the plurality of injection ports may form one injection port group, and at least two injection port groups are disposed on two opposite sides of the combustion chamber 101, wherein, taking the example that two injection port groups are disposed, two gas distribution structures 140 are disposed corresponding to two opposite sides of the combustion chamber 101; the second premixer 130 is connected with the two gas distribution structures 140 through a connecting pipe, so that the purpose that the same second premixer 130 simultaneously provides the mixed gas to the two gas distribution structures 140 synchronously is achieved, and the mixed gas ejected by each injection port is ensured to be approximately the same.

Referring to fig. 2 to 4, in an embodiment, the housing 100 further forms a gas distribution chamber 102 communicating the first premixer 120 and the combustion chamber 101; the preheating burner 110 includes a combustion assembly 111 disposed at an outlet of the distribution chamber 102. The inlet of the plenum chamber 102 communicates with the outlet of the mixing passage 123 of the first premixer 120; the mixed gas is diffused in the gas distribution chamber 102 to achieve sufficient mixing, and the flow rate of the mixed gas is reduced, thereby achieving uniform gas supply to the combustion assembly 111.

In one embodiment, the plenum 102 has an inlet plenum section disposed adjacent to the first premixer 120 with a progressively increasing plenum area along the gas flow direction. With the same reason as the second chamber 142, the gradually enlarged setting of the ventilation area of the air intake cavity section enables the mixed gas to enter the air intake cavity section, and in the circulation process, the flow rate is gradually gentle and gradually dispersed, thereby being beneficial to the even and stable mixed gas obtained by the combustion assembly 111 at each place.

The specific expression of the combustion assembly 111 is not limited in the present design, for example, in an embodiment, the combustion assembly 111 includes a plate-shaped body, and a plurality of air holes for passing the mixed gas are provided in the thickness direction of the plate-shaped body, so as to facilitate uniform combustion of the mixed gas.

Alternatively, in one embodiment, the combustion assembly 111 comprises a metal fiber mesh. The metal fiber net is approximately arranged in a plate shape and covers the air outlet of the air distribution chamber 102; the meshes of the metal fiber net form the plurality of air passing holes; the metal fiber net is arranged to be gradually protruded toward the combustion chamber 101 from the edge to the center thereof, so as to accumulate a certain amount of mixed gas, thereby realizing continuous and stable combustion of the combustion assembly 111.

Next, in an embodiment, the housing 100 includes a first housing 100a forming the distribution chamber 102 and a second housing 100b forming the combustion chamber 101, and the first housing 100a is detachably connected to the second housing 100 b. The casing 100 is divided into a first casing 100a and a second casing 100b, and the first casing 100a and the second casing 100b are detachably connected, so that each part of the combustion chamber 101 and the gas distribution chamber 102 can be conveniently disassembled and replaced. The connection between the first casing 100a and the second casing 100b may be in various manners, for example, the first casing 100a and the second casing 100b may be bent at the connection portion toward the inside of the casing 100 or toward the outside of the casing 100 to form a flange, and the flange of the first casing 100a and the flange of the second casing 100b may be assembled by screwing, snapping, adsorbing, and adhering.

Further, in an embodiment, the outer peripheral side of the metal fiber net is clamped and limited at the connection between the first casing 100a and the second casing 100 b. The first shell 100a and the second shell 100b are used for clamping the metal fiber net in a limiting manner, and other additional connecting structures do not need to be arranged between the metal fiber net and the shell 100, so that the integral structure is simplified, and the disassembling and assembling processes are simplified.

In addition, the invention also provides a gas device, which can be a gas water heater or a gas wall-mounted furnace, and comprises a heat exchanger and the burner as described above, and of course, the gas device also comprises a main structure, wherein the main structure is internally provided with a heat exchange chamber 200 and a smoke outlet communicated with the heat exchanger, the heat exchanger is arranged in the heat exchange chamber 200, the burner is provided with a smoke outlet, and the smoke outlet of the burner is communicated with the heat exchange chamber 200. The heat exchanger is connected to an external water source, such as tap water, the high-temperature flue gas entering the heat exchange chamber 200 through the flue gas outlet of the burner carries enough heat to continuously exchange heat with the water in the heat exchanger, so that the temperature of the water is increased to be required, and hot water is prepared.

It can be understood that the heat exchanger includes a heat exchange pipe 210, the heat exchange pipe 210 passes through the heat exchange chamber 200, one end of the heat exchange pipe 210 is communicated with an external water source, and the other end is used for users to use, so that when the burner works, flue gas generated by combustion in the combustion chamber 101 enters the heat exchange chamber 200, tap water is heated through heat conduction between the heat exchange pipe 210 and high-temperature flue gas, and hot water is finally prepared. The specific arrangement manner of the heat exchange tube 210 in the heat exchange chamber 200 is not limited, and for example, the heat exchange tube 210 may be bent several times and then arranged inside the heat exchange chamber 200, or wound around the periphery of the heat exchange chamber 200.

The combustor can be arranged independently of the main structure of the wall-mounted gas stove, and the combustor and the main structure of the wall-mounted gas stove are connected and fixed in a screwing fixing mode, a buckling fixing mode and the like, so that the wall-mounted gas stove is convenient to disassemble, assemble and replace at any time; of course, the combustor can also be used as a component in the main structure of the wall-mounted gas boiler, and the combustor and the main structure are integrally formed, so that the wall-mounted gas boiler is easy to process, and the whole structure is more compact.

The combustion chamber 101 and the heat exchange chamber 200 can be independently arranged, and after sufficient combustion is realized in the combustion chamber 101 to generate enough combustion flue gas, the combustion flue gas is discharged into the heat exchange chamber 200 through the communication part of the combustion chamber 101 and the heat exchange chamber 200, so that the heat exchange purpose is achieved. Of course, the combustion chamber 101 and the heat exchange chamber 200 may also be integrally disposed, the combustion chamber 101 may form at least a portion of the heat exchange chamber 200, and at least a portion of the heat exchange tubes 210 may be further directly disposed in the combustion chamber 101, so as to achieve a better heat exchange effect.

It should be noted that, the detailed structure of the burner in the gas appliance may refer to the above-mentioned embodiment of the burner, and is not described herein again; because the burner is used in the gas equipment, the embodiment of the gas equipment comprises all technical schemes of all embodiments of the burner, and the achieved technical effects are completely the same, which are not described again.

Claims

1. A burner, comprising:

a housing formed with a combustion chamber;

a first pre-mixer for providing a set proportion of mixed gas to the pre-heating burner; and (c) a second step of,

2. The burner of claim 1, wherein the first premixer includes a casing and a first fan, the casing is formed with an air inlet duct, a gas flow duct, and a mixing passage, the mixing passage is communicated with the air inlet duct and the gas flow duct, respectively;

wherein, first fan is located mixing channel.

3. The burner of claim 1, wherein the second premixer comprises an air inlet duct, a gas duct and a second fan, and the mixing chamber is communicated with the air inlet duct and the gas duct respectively;

wherein, the second fan is arranged on the air inlet pipeline.

4. The burner of claim 3, wherein the second premixer further comprises a housing forming the mixing chamber, the housing being removably connected to the second fan.

5. The burner of claim 1, wherein a plurality of injection ports are arranged at intervals on the side of the combustion chamber, and the mixing chamber injects the mixed gas into the combustion chamber through the injection ports.

6. The combustor of claim 5, further comprising a gas distribution structure through which the second premixer communicates with the plurality of injection ports in a one-to-one correspondence.

7. The burner of claim 6, wherein the gas distribution structure is formed with a gas distribution cavity, the gas distribution cavity comprises a first chamber and a second chamber which are communicated in sequence, the gas inlet of the first chamber is communicated with the second premixer, and the gas outlet of the second chamber is communicated with the combustion chamber;

8. The burner of claim 1, wherein the housing is further formed with a plenum chamber in communication with the first premixer and the combustion chamber, respectively;

9. The burner of claim 8, wherein the plenum chamber has an inlet plenum section disposed adjacent the first premixer, the inlet plenum section having a plenum area that increases in a direction of gas flow.

10. The burner of claim 8, wherein the combustion assembly comprises a metal fiber mesh.

11. The burner of claim 10, wherein the housing includes a first housing forming the distribution chamber and a second housing forming the combustion chamber, the first housing being removably connected to the second housing.

12. The burner of claim 11, wherein the peripheral side of the metal fiber web is clamped to a limit at the junction between the first housing and the second housing.

13. The burner of claim 1, further comprising a fuel gas assembly including an inlet conduit in communication with the first and second pre-mixers, respectively, and a fuel gas proportioning valve to regulate fuel gas flow to the first and second pre-mixers, respectively.

14. The combustor of claim 1, wherein said preheat combustor is a fully premixed combustor.

15. A gas-fired appliance comprising a heat exchanger and a burner as claimed in any one of claims 1 to 14, the heat exchanger producing hot water from heat generated by the burner.

16. The gas fired device of claim 15, comprising a gas fired water heater or a gas fired wall-mounted furnace.