Low-nitrogen combustor with rotational flow flame stabilizing and radial injection function

Abstract

The invention provides a low-nitrogen combustor with a rotational flow flame stabilizing and radial injection function. The low-nitrogen combustor is composed of a combustor air channel main pipe, a combustor flame stabilizing disc, a center fuel supply pipe, a main channel dispersed fuel direct injection head, a flame stabilizing fuel injection head and an ignition channel system. A slot with a radial opening is formed between the tail end of the combustor air channel main pipe and the combustor flame stabilizing disc, and air is accelerated to flow out through the main channel dispersed fueldirect injection head along the radial slot; and after mixed gas flow collides with a hearth, one stream of gas flow deviates downstream to form downward vortex, and the other stream of gas flow deviates upstream to form upstream vortex. A rotational flow blade structure is arranged in the center of the flame stabilizing disc, a center flow return structure is formed downstream, the center flameis more stable and reliable in a diffusive combustion manner, and the oscillation risk of the hearth is reduced. Main channel combustion belongs to semi-premixed combustion, and dispersed fuel is directly injected, so that the equivalence ratio is evenly distributed; and due to the existence of the upstream vortex, internal circulation of smoke is formed, and the above overall characteristic achieves the effect of reducing nitric oxide emissions of the combustor.

Description

technical field [0001] The present invention relates to the technical field of burners, in particular to a swirl flame stabilizing radial injection low-nitrogen burner, which is a burner using gaseous fuel, suitable for industrial furnaces or gas-fired boilers using gaseous fuel, and capable of burning The equivalence ratio distribution is more uniform, and the flue gas is circulated inside, reducing the emission of nitrogen oxides. Background technique [0002] At present, the impact of smog across the country is getting worse every year. One of the important means to control smog is to reduce the gas emission pollution of boilers. At present, the average nitrogen oxides produced by gas-fired boilers in Beijing is about 146 mg / m3. On June 10, 2015, the Beijing Municipal Environmental Protection Bureau issued local standards for air pollutant emissions. The main purpose of the revision and implementation of the "Boiler Air Pollutant Emission Standards" is to strictly contro...

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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

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