Classified-combustion fuel gas low-nitrogen combustor

Abstract

The invention discloses a classified-combustion fuel gas low-nitrogen combustor. The classified-combustion fuel gas low-nitrogen combustor comprises first-level fuel spray guns, second-level fuel spray guns, smoke inner circulation injection pipes, a combustion-supporting air channel, a center straight flow air channel, a first-time cyclone air channel, a second-time cyclone air channel and a necking-down type spray port. The center straight flow air channel is arranged in the center of the necking-down type spray port. The first-time cyclone air channel and the second-time cyclone air channel are sequentially arranged on the outer side of the center straight flow air channel. The first-level fuel spray guns are circumferentially and evenly distributed between the first-time cyclone air channel and the second-time cyclone air channel. The smoke inner circulation injection pipes are located on the outermost side in the necking-down type spray port of the combustor, the second-level fuel spray guns stretch into the smoke inner circulation injection pipes, and the smoke inner circulation injection pipes and the second-level fuel spray guns are all evenly distributed on the same reference circle. According to the classified-combustion fuel gas low-nitrogen combustor, the means of fuel classification, air classification, smoke inner circulation and the like are combined, the temperature of a flame high-temperature area is reduced, the mixing time of fuel and air is prolonged, and generation of NOx is effectively restrained.

Description

Technical field [0001] The invention relates to a combustor, in particular to a staged combustion gas low-nitrogen combustor suitable for power station boilers and industrial boilers. Background technique [0002] Air pollution has become a hot spot of global concern. One of the main culprits of air pollution is nitrogen oxides. In China, with the popularization of gas use and increasingly stringent environmental protection requirements, all power station boilers and industrial boilers equipped with burners have NOx emissions that do not meet the standards and pollute the environment. Therefore, the study of low-NOx burners has become one of the effective methods to solve air pollution. [0003] After research, the NOx produced by gas burners is mainly NO. The production of NOx is divided into thermal NOx, fast NOx and fuel NOx. For fuels with high calorific value and no nitrogen compounds, NOx is mainly thermal. The main factor for generating thermal NOx is temperature. Control...

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Problems solved by technology

[0004] Now some commonly used low nitrogen technologies, including fuel classification, air classification, flue gas recirculation and other technologies, have not fully found the core of gas low nitrogen combustion technology, the gas and combustion air have not been properly mixed, the structure of the burner is unreasonable, and Can not meet the current environmental protection requirements

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