Low nitrogen cyclone gas burner with gas-air accurate classification function and internally provided with flue gas recirculation channels

Abstract

The invention relates to a low nitrogen cyclone gas burner with the gas-air accurate classification function and internally provided with flue gas recirculation channels. The low nitrogen cyclone gasburner comprises a hearth, a furnace wall, a center fuel conveying pipeline, a primary air channel and a mixing channel, wherein the center fuel conveying pipeline, the primary air channel and the mixing channel are arranged sequentially from inside to outside in a sleeved mode; the front ends of the center fuel conveying pipeline, the primary air channel and the mixing channel penetrate through the furnace wall to extend into the hearth; the multiple sections of recirculation channels are arranged on the outer side wall of the mixing channel and located in the hearth; a center fuel sprayer and a plurality of secondary fuel sprayers are arranged at the front end of the center fuel conveying pipeline; a plurality of third-stage fuel guns and a plurality of secondary air spray guns are evenly arranged in the mixing channel at intervals, and the center fuel conveying pipeline and the third-stage fuel guns are connected with a fuel supply device; and the primary air channel and the secondary air spray guns are connected with an oxidizing agent supply device. By means of the low nitrogen cyclone gas burner, the burning conditions are effectively improved, the burning efficiency is high,and the concentration of nitric oxides is effectively reduced.

Description

technical field [0001] The invention belongs to the field of gas burners, in particular to a low-nitrogen swirl gas burner with gas and air precisely graded and built-in flue gas recirculation. Background technique [0002] Nitrogen oxide is one of the main sources of air pollution. In addition to acid rain, it can also form photochemical smog, which is harmful to human health. However, burners using existing fossil fuels cannot avoid the production of NO and NO due to chemical reactions during combustion. 2 The chemical formula of nitrogen oxides (NO X ). In the industry, low NOx for suppressing nitrogen oxides is developed by improving the structure of the burner such as the mixing form of fuel and air and the ratio of air to fuel. X combustion technology. [0003] Currently used low NO X There are two main types of burners. One is an air staging burner. The air staging burner splits the combustion air into primary air and secondary air, so that the gas burns in the...

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Problems solved by technology

However, the structure of the external flue gas recirculation is complex and requires additi

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