External uniform mixing low-nitrogen combustor

Abstract

The utility model relates to low nitrogen combustor technical field, concretely relates to an external uniform mixing type low nitrogen combustor, including main pipeline, flow divider, gas shunt pipe, ignition gas gun, ignition device and flame monitoring device, and the main pipeline is respectively communicated with gas inlet and combustion -supporting air inlet who sets up, uses natural gas from gas inlet to enter the main pipeline inside, and directly runs to the flow divider downward, then directly shunts through a plurality of gas shunt pipes, and the gas can mix with the air in the premixer at the bottom of the main pipeline finally, then, when encountering open fire, can burn fully, the gas and air mixing structure of the application compares the ratio control structure under prior art, less by outside interference, gas and air directly premix in the burner's spout, then burn after encountering open fire, the structure is more simple, and flow delivery is more stable, and further can pass in gas spout premix gas and air, compared with the existing ratio control structure, will be more conducive to the stable combustion of the burner.

Description

Technical Field

[0001] This utility model relates to the field of low-NOx burner technology, and in particular to an externally uniformly mixed low-NOx burner. Background Technology

[0002] The core difference between low-NOx burners and ordinary burners lies in their emission control technology and environmental performance. The former reduces NOx emissions to 30 mg / m³ through technologies such as staged combustion and flue gas recirculation. 3 The following points highlight the significant improvement in combustion efficiency, making it suitable for scenarios with high environmental standards. Low-NOx combustion technology optimizes the combustion process to suppress or reduce nitrogen oxides (NOx) during fuel combustion. x This technology primarily targets the generation of NO and NO2. Its core principle is to control combustion temperature, oxygen concentration, and the mixing method of fuel and air to reduce NO. x The conditions for its generation.

[0003] Currently, traditional burners mostly use proportional control when premixing gas and air, that is, adjusting the air-fuel ratio through gas valves and variable frequency fans to maintain it near the theoretical equivalence ratio (such as natural gas, which is usually 10:1-12:1 air / gas volume ratio). However, the heat dissipation capacity of the variable frequency fan decreases when running at low frequencies, which may cause the motor to overheat. At certain frequencies, it may cause mechanical resonance. Therefore, this structure is very complex and has poor working stability, which is not conducive to stable combustion of the burner. Utility Model Content

[0004] The purpose of this invention is to provide an externally uniformly mixed low-NOx burner, which, by premixing gas and air at the gas nozzle, is more conducive to stable combustion compared to existing proportional control structures.

[0005] To achieve the above objectives, this utility model provides an externally uniformly mixed low-NOx burner, including a main pipe, which is disposed inside the burner body. A gas inlet and a combustion air inlet are respectively connected to the main pipe, and the combustion air inlet is lower than the gas inlet.

[0006] A distributor is connected to the bottom of the main pipeline, and multiple gas split pipes are installed at the bottom of the distributor, with an ignition gun installed on the side near the gas split pipes.

[0007] An ignition device and a flame monitoring device are installed at the top of the main pipeline.

[0008] The ignition device uses high-voltage pulse ignition.

[0009] The flame monitoring device uses UV ultraviolet flame detection to detect flameout.

[0010] The gas distribution pipes are arranged in four groups, with 25 pipes in each group.

[0011] The ignition device may also employ a continuous flame design.

[0012] This utility model discloses an externally uniformly mixed low-NOx burner. In use, natural gas enters the main pipeline from the gas inlet and flows directly downwards to the distributor. It then passes through multiple gas distribution pipes for distribution. Finally, the gas can be directly mixed with air in the premixer at the bottom of the main pipeline. Then, it can be fully burned upon contact with an open flame. Compared with the existing proportional control structure, the gas and air mixing structure of this application is less affected by external interference. The gas and air are premixed directly at the burner nozzle and then burned upon contact with an open flame. The structure is more streamlined and the flow delivery is more stable. Furthermore, by premixing the gas and air at the gas nozzle, it is more conducive to stable combustion of the burner compared to the existing proportional control structure. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0014] Figure 1 This is a schematic diagram of the overall structure of the externally uniformly mixed low-NOx burner of this utility model.

[0015] Figure 2 This is a front view of the combustion air inlet of this utility model.

[0016] Figure 3 This is the extension of the present utility model. Figure 1 Front view of the gas splitter pipe in direction A.

[0017] Figure 4 This is a schematic diagram showing the location of the observation hole in this utility model.

[0018] Figure 5 This is a cross-sectional view of the ignition air gun of this utility model.

[0019] In the diagram: 101-Main pipe, 102-Burner body, 103-Gas inlet, 104-Combustion air inlet, 105-Diverter, 106-Gas diverter pipe, 107-Ignition gun, 108-Ignition device, 109-Flame monitoring device, 110-Observation hole. Detailed Implementation

[0020] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0021] like Figures 1 to 5 As shown, where Figure 1 This is a schematic diagram of the overall structure of an externally homogeneous mixing low-NOx burner. Figure 2 This is the front view of the combustion air inlet 104. Figure 3 It is along Figure 1 Front view of the gas splitter pipe 106 in direction A. Figure 4 This is a schematic diagram showing the location of the observation hole 110. Figure 5 This is a cross-sectional view of the ignition gas gun 107. This invention provides an externally uniformly mixed low-NOx burner, comprising a main pipe 101, a distributor 105, a gas distribution pipe 106, an ignition gas gun 107, an ignition device 108, and a flame monitoring device 109. The main pipe 101 is connected to a gas inlet 103 and a combustion air inlet 104. The ignition device 108 employs a high-pressure pulse ignition or a continuous flame design. The gas distribution pipe 106 is arranged in four groups, with 25 pipes in each group. This design premixes the gas and air at the gas nozzle, which, compared to existing proportional control structures, is more conducive to stable combustion in the burner. It is understood that this design is more conducive to stable combustion in the burner.

[0022] In this embodiment, the main pipe 101 is located inside the burner body 102 and is used for gas delivery. A viewing hole 110 is provided on the shell at the top of the burner body 102. The burner body 102 uses a high-temperature resistant metal honeycomb burner: the porosity of the high-temperature resistant porous burner must be uniform to ensure flame stability. Surface load: Design power density 1000kW / m³ 2 After the equipment is assembled, a leak detector is needed to check whether the gas leak meets the standards.

[0023] The main pipeline 101 is connected to a gas inlet 103 and a combustion air inlet 104, with the combustion air inlet 104 being lower than the gas inlet 103. The gas inlet 103 is used for natural gas to enter, and the combustion air inlet 104 is used for the input of combustion air.

[0024] A distributor 105 is connected to the bottom of the main pipeline 101. Multiple gas diversion pipes 106 are installed at the bottom of the distributor 105, and an ignition gun 107 is installed near one of the gas diversion pipes 106. The distributor 105 diverts natural gas and sprays it out through the multiple gas diversion pipes 106. The sprayed gas mixes directly with air in the premixing zone at the bottom of the main pipeline 101, and then burns completely upon contact with an open flame. The ignition gun 107 is used for ignition; it uses electricity to generate a high-temperature flame, which ignites the gas through the igniter nozzle. The user only needs to press the ignition button, and the ignition gun will quickly generate a flame, thus achieving rapid ignition of the gas mixture.

[0025] An ignition device 108 and a flame monitoring device 109 are installed at the top of the main pipeline 101. The ignition device 108 works in conjunction with the ignition gun 107 to ignite the mixture of gas and air, and the flame monitoring device 109 monitors the flame status.

[0026] Secondly, the ignition device 108 employs high-voltage pulse ignition. The ignition device 108 works in conjunction with the ignition air gun 107 to achieve the ignition operation.

[0027] Then, the flame monitoring device 109 uses UV flame detection to extinguish the flame. In existing technology, UV flame detectors identify fires by detecting ultraviolet radiation in the 185-260nm wavelength range within the flame, combined with intelligent algorithms and sensor technology. The detector incorporates a solar-blind ultraviolet sensor specifically designed to capture ultraviolet radiation in the 185-260nm wavelength range. This wavelength range falls within the "solar-blind zone" where sunlight cannot penetrate the atmosphere, ensuring the detector is not affected by sunlight. It employs full-pulse analysis (PPW) and slope-increasing detection (PAM) techniques, using a 32-bit microprocessor to analyze the pulse frequency and intensity changes of ultraviolet radiation in real time. The dynamic threshold adaptive algorithm can complete spectral feature comparison within 0.5 seconds, significantly improving response speed.

[0028] Furthermore, the gas diversion pipes 106 are arranged in four groups, with 25 pipes in each group. The gas diversion pipes 106 are directly used for gas transportation and diversion. The outlet side of the distributor 105 has through holes corresponding to the gas diversion pipes 106, and these through holes are not interconnected. In actual use, the number and groups of gas diversion pipes 106 can be set as needed.

[0029] Finally, the ignition device 108 may also adopt a continuous flame design.

[0030] When using this invention, which premixes gas and air at the gas nozzle, compared to existing proportional control structures, it is more conducive to stable combustion of the burner. In use, natural gas enters the main pipeline 101 from the gas inlet 103 and flows directly downwards to the distributor 105. Then, it is directly distributed through multiple gas distribution pipes 106. Finally, the gas can be directly mixed with the air in the premixing area at the bottom of the main pipeline 101. Then, the ignition gun 107 works so that the mixture can be fully burned when it encounters an open flame. Compared with the existing proportional control structure, the gas and air mixing structure of this application is less affected by external interference. The gas and air are premixed directly at the nozzle of the burner body 102 and then burned when they encounter an open flame. The structure is more streamlined and the flow delivery is more stable. Therefore, by premixing gas and air at the gas nozzle, it is more conducive to stable combustion of the burner compared to existing proportional control structures.

[0031] The above-disclosed embodiments are merely one or more preferred embodiments of this application and should not be construed as limiting the scope of this application. Those skilled in the art can understand that all or part of the processes for implementing the above embodiments and equivalent changes made in accordance with the claims of this application still fall within the scope of this application.

Claims

1. An externally homogeneous mixing low-NOx burner, comprising a main pipe disposed inside the burner body, characterized in that: The main pipeline is connected to a gas inlet and a combustion air inlet, with the combustion air inlet being lower than the gas inlet. A distributor is connected to the bottom of the main pipeline, and multiple gas split pipes are installed at the bottom of the distributor, with an ignition gun installed on the side near the gas split pipes. An ignition device and a flame monitoring device are installed at the top of the main pipeline.

2. The externally homogeneous mixing low-NOx burner as described in claim 1, characterized in that: The ignition device uses high-voltage pulse ignition.

3. The externally homogeneous mixing low-NOx burner as described in claim 1, characterized in that: The flame monitoring device uses UV ultraviolet flame detection to detect flameout.

4. The externally homogeneous mixing low-NOx burner as described in claim 1, characterized in that: The gas distribution pipes are set in four groups, with 25 pipes in each group.

5. The externally homogeneous mixing low-NOx burner as described in claim 2, characterized in that... : The ignition device may also employ a continuous flame design.

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