Fully-premixed metal net combustor

Abstract

The embodiment of the invention discloses a fully-premixed metal net combustor. A spiral flow type mixer is arranged on the upstream of a gas mixing and distributing device and arranged in a premixing cavity, the gas mixing and distributing device is arranged in a supporting element below the combustion surface, due to the fact that the spiral flow type mixer has the better gas and air mixing effect, the gas mixing and distributing device has the better uniform gas distributing effect, combustion is complete, and pollutants can be reduced. A high-temperature-resistant metal net serves as the combustion surface, the porosity of the metal net is large, air resistance is small, the mesh net is not likely to be blocked by tiny dust in air, and therefore the efficiency of a draught fan is high. Due to the adoption of the gas mixing and distributing device, the length-diameter ratio of the premixed combustor can be large, the premixed combustor with the high power can be manufactured, service life is long, and cost is low.

Description

technical field [0001] The present application relates to the technical field of fully premixed surface combustion of gas combustion equipment, in particular to a fully premixed metal mesh burner. Background technique [0002] Fully premixed surface combustion refers to the uniform mixing of gas and air in the premix chamber, and the mixed gas burns on the combustion surface of the burner without secondary air participating in the combustion. The structural design of the fully premixed surface burner and the material selection of the combustion surface have a great influence on the combustion of the mixed gas. [0003] In order to reduce the emission of combustion pollutants, some metal fiber burners with complex manufacturing processes and high costs have been developed. For example, the Chinese patent with the application number 201420238167 and the patent title "A Metal Fiber Burner for Environmentally Friendly Gas Boilers" proposes a A premixed burner covered with iron-...

AI Technical Summary

Problems solved by technology

[0003] In order to reduce the emission of combustion pollutants, some metal fiber burners with complex manufacturing processes and high costs have been developed. For example, the Chinese patent with the application number 201420238167 and the patent title "A Metal Fiber Burner for Environmentally Friendly Gas Boilers" proposes a A premixed burner covered with iron-chromium-aluminum fiber braids on the surface of the supporting element. The flame adheres to the surface of the metal fiber and burns. The pores are small, the flame stability is good, it is not easy to temper, it is not easy to leave the flame, and the adjustment ratio is also large. , pollutant emissions are at a good level

However, due to the small pores of the iron-chromium-aluminum fiber braid, the tiny dust in the air is easy to block the combustion surface, resulting in local high temperature and shortening the service life of the combustion surface. In addition, it is necessary to install an air filter device, resulting in large wind resistance, and further The efficiency of the fan is reduced. This kind of burner swirl gas mixing device is relatively simple, and the gas and air mixing uniformity is poor. The gas mixing device is only suitable for cylindrical burners with small length and diameter.

The manufacturing process of iron-chromium-aluminum fiber is complicated and the cost is high

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