Fully premixed combustion device with radiation belt heater

Abstract

The utility model discloses a full-premixing combustion device with a radiation belt heater, which comprises a gas valve group, an air filter element device, a Venturi mixing tube and a premixing fan, a first port of the venturi mixing pipe is connected with the gas valve group, and a second port of the venturi mixing pipe is connected with the air filter element device so that external gas and air can be preliminarily mixed in the venturi mixing pipe; and a third port of the Venturi mixing pipe is connected with a premixing fan so as to be used for further mixing the preliminarily mixed air and fuel gas in the premixing fan. According to the utility model, under the suction action of the premixing fan, fuel gas enters from the fuel gas valve group, air enters from the air filter element device, and the fuel gas and the air are mixed in the Venturi mixing tube according to a certain proportion. Due to full premixed combustion, in the combustion process, no redundant oxygen and air nitrogen are subjected to chemical reaction, generation of thermal nitrogen oxide is reduced, and therefore emission of nitrogen oxidation is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of burners, in particular to a full premixed combustion device with a radiation belt heater. Background Art

[0002] The existing combustion systems are all atmospheric burners, which have relatively high nitrogen oxide emissions and cause serious environmental pollution. In order to comply with national environmental protection policies, the application of fully premixed low-nitrogen combustion in radiant zone heaters is promoted to make combustion more complete and reduce nitrogen oxide emissions at the same time. Summary of the invention

[0003] In view of the problems existing in the prior art, the purpose of the utility model is to provide a full premixed combustion device of a radiant belt heater.

[0004] To solve the above problems, the utility model adopts the following technical solutions.

[0005] A fully premixed combustion device with a radiation belt heater comprises a gas valve group, an air filter, a venturi mixing tube and a premixing fan, wherein the first port of the venturi mixing tube is connected to the gas valve group, and the second port is connected to the air filter for preliminarily mixing external gas and air in the venturi mixing tube, and the third port of the venturi mixing tube is connected to the premixing fan for further mixing the preliminarily mixed air and gas in the premixing fan.

[0006] As a further improvement of the utility model, the output end of the premixing fan is connected to a metal fiber burner head, the surface of the metal fiber burner head is wrapped with a metal woven mesh, and the gas and air are mixed and then come out from the slits of the metal woven mesh.

[0007] As a further improvement of the utility model, an ignition needle and a sensing needle assembly are arranged on the metal fiber combustion head.

[0008] Beneficial effects of the utility model

[0009] Compared with the prior art, the advantages of the present invention are:

[0010] In the utility model, under the suction of the premixing fan, the gas comes in from the gas valve group and the air comes in from the air filter element. The two are mixed in a certain proportion in the venturi mixing tube. The mixture of gas and air is sent to the metal fiber combustion head through the blowing action of the premixing fan. For the combustion head on the surface of the metal fiber braid, the mixture of gas and air is ignited after being uniformly infiltrated through the metal fiber surface. Since it is a fully premixed combustion, only a layer of blue flame is formed on the surface of the metal fiber combustion head barrel wall. During the combustion process, there is no excess oxygen to chemically react with the nitrogen in the air, which reduces the generation of thermal nitrogen oxides, thereby reducing the emission of nitrogen oxides. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of the utility model. DETAILED DESCRIPTION

[0012] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model; it is obvious that the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the utility model without making creative work are within the scope of protection of the utility model.

[0013] See also Figure 1 A fully premixed combustion device with a radiation belt heater comprises a gas valve group 2, an air filter 1, a venturi mixing tube 3 and a premixing fan 4, wherein a first port of the venturi mixing tube 3 is connected to the gas valve group 2, and a second port is connected to the air filter 1 for preliminarily mixing external gas and air in the venturi mixing tube 3, and a third port of the venturi mixing tube 3 is connected to the premixing fan 4 for further mixing the preliminarily mixed air and gas in the premixing fan 4.

[0014] Furthermore, the output end of the premixing fan 4 is connected to a metal fiber burner head 6, the surface of the metal fiber burner head 6 is wrapped with a metal woven mesh, and the gas and air are mixed and then come out from the slits of the metal woven mesh.

[0015] Furthermore, an ignition needle and a sensing needle assembly 5 are provided on the metal fiber burner head 6 .

[0016] Fully premixed gas combustion refers to a combustion method in which the gas is fully mixed with sufficient air before the burner, and no air supply is required during the combustion process.

[0017] The full premixed combustion head assembly consists of a gas valve group 2, an air filter 1, a venturi mixing tube 3, a premixed fan 4, an ignition needle and induction needle assembly 5, a metal fiber combustion head 6, etc. Under the suction of the premixed fan 4, the gas comes in from the gas valve group 2 and the air comes in from the air filter 1. The two are mixed in a certain proportion in the venturi mixing tube 3. The mixture of gas and air is sent to the metal fiber combustion head 6 through the blowing action of the premixed fan 4. For the combustion head on the surface of the metal fiber braid, the mixture of gas and air is ignited after being uniformly permeated through the metal fiber surface. Because it is a full premixed combustion, only a layer of blue flame is formed on the surface of the metal fiber combustion head 6. During the combustion process, there is no excess oxygen to react chemically with the nitrogen in the air, which reduces the generation of thermal nitrogen oxides, thereby reducing the emission of nitrogen oxides.

[0018] The gas valve group 2 plays the role of controlling the on and off of the gas valve group 2. At the same time, it cooperates with the Venturi mixing tube 3 to enter the heat load regulation under the different negative pressures of the fan. During the regulation process, the ratio of gas flow to air flow is always kept constant.

[0019] In the Venturi mixing tube 3, under the suction of the premixing fan 4, the gas and air are mixed at the fan inlet to ensure that the gas and air are fully mixed. The air flows through the Venturi mixed gas, which will generate negative pressure at the throat of the Venturi mixing tube 3. The gas enters from the throat of the Venturi mixing tube 3 and mixes with the air, realizing the synchronous regulation of the gas flow rate and the air flow rate and maintaining a constant ratio.

[0020] Premixing fan 4, after the gas and air are mixed, the premixing fan 4 blows them to the metal fiber combustion head 6, and the fan speed can be adjusted to control the size of the combustion firepower.

[0021] The air filter filters the combustion air, provides clean air for combustion, and prevents dirty air from entering, which would make the metal fibers in the mixing tube and the combustion head dirty, affecting the mixing parameters and the combustion effect, so that the metal fiber combustion head 6 has a better combustion effect and a longer life. The shape is square or cylindrical.

[0022] The metal fiber burner head 6 is wrapped with a metal woven mesh on the surface. After the gas is mixed with air, it comes out from the slits of the metal woven mesh and is ignited and burned. The combustible mixture burns above the fabric, and the flame floats on the surface in a blue color. Heat is released by convection. Due to the uniform air 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. There is no local high temperature, so the generation of NOx is suppressed. The premixed gas is fully burned, so the emission of C is also low.

[0023] The ignition needle and the induction needle assembly 5, the ignition needle is used to ignite the combustible mixture, and the induction needle transmits the flame signal to the ignition controller.

[0024] The above is only a preferred specific implementation of the utility model; however, the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solution and improved ideas of the utility model within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model.

Claims

1. A fully premixed combustion device with a radiant belt heater, characterized in that: It includes a gas valve group, an air filter, a venturi mixing tube and a premixing fan. The first port of the venturi mixing tube is connected to the gas valve group, and the second port is connected to the air filter to preliminarily mix the external gas and air in the venturi mixing tube. The third port of the venturi mixing tube is connected to the premixing fan to further mix the preliminarily mixed air and gas in the premixing fan.

2. A fully premixed combustion device with a radiant belt heater according to claim 1, characterized in that: The output end of the premixing fan is connected to a metal fiber burner head, the surface of the metal fiber burner head is wrapped with a metal woven mesh, and the gas and air are mixed and then come out from the slits of the metal woven mesh.

3. A fully premixed combustion device with a radiant belt heater according to claim 2, characterized in that: The metal fiber combustion head is provided with an ignition needle and a sensing needle assembly.

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