Metal-fiber front mixing burner based on central reverse burning head

Abstract

The invention relates to a metal-fiber front mixing burner based on a central reverse burning head. The metal-fiber front mixing burner comprises a premixing chamber, a fan and the central reverse burning head. The premixing chamber comprises a Venturi structure, fuel gas and air sequentially pass through the premixing chamber and the fan, and are mixed two times in the premixing chamber and an inner cavity of the fan to enter the central reverse burning head, and the mixture is burned on the surface of a metal fiber. According to the metal-fiber front mixing burner based on the central reverse burning head, the central reverse burning head has the smoke flow direction similar to the smoke flow direction of a diffusion-type burner, and also can overcome the defect of high nitrogen oxide of the diffusion-type burner, and the efficiency and outputting force of a boiler are not influenced. The premixing chamber is arranged on an air feeding opening of the fan, an air mixing structure of an air discharging opening of the fan is reduced, and air and fuel gas are directly mixed under stirring of impellers of the fan; meanwhile, a zero pressure valve is adopted, the air-fuel ratio is automatically controlled, a control system is simplified, and the stability and the safety of the burner are improved.

Description

technical field [0001] The invention relates to the technical field of gas burners, in particular to a metal fiber pre-mixing burner based on a center back combustion head. Background technique [0002] At present, in boiler manufacturing enterprises, for the central combustion boiler, the end of the combustion chamber is a closed structure, generally using a diffused combustion head, and the flame of the diffused combustion head is the first return; after the flame burns out, the flue gas burns along the The indoor wall turns back to the front smoke box to form the second return; after that, it enters the smoke pipe again to form the third return, such as image 3 shown. However, the use of a diffused combustion head will catalyze a large amount of nitrogen and oxygen in the air to form nitrogen oxides due to the existence of local high temperature, and the emission of nitrogen oxides will cause serious pollution to the atmosphere. The metal fiber burner that has appeared ...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the standard metal fiber combustion head cannot be well adapted to the central back-fired boiler and the post-premixed metal fiber burner has a large volume and complicated structure, the present invention provides a metal fiber pre-mixed burner based on the center back-fired head, The center back combustion head not only has the flue gas flow direction similar to that of the diffusion burner, but also overcomes the defect of high nitrogen oxides of the diffusion burner without affecting the efficiency and output of the boiler

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