Multi-point direct injecting and opposite shearing and fast-mixing radial injection low-nitrogen combustor

Abstract

The invention discloses a multi-point direct injecting and opposite shearing and fast-mixing radial injection low-nitrogen combustor. The combustor is composed of a combustor gas circuit main pipe, acombustor head baffle, a central fuel supply pipe, a main path fuel injection device and an ignition path system; a seam groove with a radial opening is formed between the tail end of the combustor gas path main pipe and the combustor head baffle, gas is accelerated out through the radial seam groove after passing by the two sides of the main path fuel injection device, gaseous fuel is transversely sprayed into the accelerated gas flow through small holes in the two sides of the fuel injection device, the gas flow at the two sides of the fuel injection device is subjected to intersection shearing, the mixing of the gas and the fuel is accelerated, and the mixed gas is injected into a hearth through the radial groove; one stream of the mixed gas flow is deflected to the downstream after being collided with the hearth, so that a mainstream vortex is formed, the other stream of the mixed gas flow is deflected to the upstream, and an upstream vortex is formed; and the fuel is direct injected in a multi-point mode, the equivalent ratio is uniformly distributed, the flame impacts the wall surface of the hearth, heat exchange is accelerated, the internal circulation of the flue gas is formed due to the presence of the upstream vortex, and the comprehensive characteristics achieve the effect of reducing the emission of nitrogen oxide of the combustor.

Description

technical field [0001] The present invention relates to the technical field of burners, in particular to a multi-point direct injection opposite-cut fast-mixing radial injection low-nitrogen burner, which is a burner using gaseous fuel and is suitable for industrial furnaces or gas boilers using gaseous fuel. It can make the distribution of combustion equivalence ratio more uniform, the internal circulation of flue gas, and reduce the emission of nitrogen oxides. Background technique [0002] At present, Beijing, the capital, is seriously affected by smog every year. In the early stage, a comprehensive transformation of Beijing's coal-fired boilers was carried out to replace coal with gas, reducing pollutant emissions from energy sources, and achieving the role of controlling air pollution. The low-nitrogen transformation of gas-fired boilers is to reduce nitrogen oxides and water vapor in the air, and it is also a key project task in the Beijing Clean Air Action Plan. At p...

AI Technical Summary

Problems solved by technology

At present, the surface premixed combustion scheme is relatively mature, but there is a risk of boiler explosion caused by the blockage of the metal mesh; the problems of premixed stable flame combustion are mainly the detonation during the ignition process and the shock during the combustion process, which are all faced by premixed combustion. problems and challenges

[0007] To sum up, to reduce the nitrogen oxide emissions of industrial furnaces or gas-fired boilers, many transformation technologies will increase the construction and operation costs, and pre-mixed combustion will bring unpredictable potential dangers.

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