Staged combustion method and system for gaseous fuel

Abstract

The staged combustion method comprises the steps that S1, a hearth is divided into first-stage to n-stage combustion areas, all the stages of combustion areas communicate with one another, and the first-stage combustion area is controlled to be in a negative pressure state; s2, gaseous fuel and primary air are continuously fed into the first-stage combustion area, one-way spiral flames are formed in the first-stage combustion area, the one-way spiral flames flow from the first-stage combustion area to the n-stage combustion area, and the flow of the gaseous fuel and the flow of the primary air are controlled through a mass flow meter; s3, the secondary air to the nth air are sent into the secondary combustion area to the nth combustion area in sequence in a one-to-one correspondence mode, and the flow of the secondary air to the nth air is controlled through a mass flow meter; insufficient combustion is carried out in the first-stage combustion area, so that the temperature of the combustor area can be effectively reduced, and generation of thermal nitrogen oxides is controlled from the source; and through multi-stage combustion, flue gas backdraft is performed in more combustion areas, so that the pollutant emission of exhaust gas can be effectively reduced.

Description

technical field [0001] The invention relates to the technical field of fuel combustion, in particular to a method and system for staged combustion of gaseous fuels. Background technique [0002] The main components of liquefied petroleum gas are propane, butane and other alkanes. Due to its high calorific value, no smoke, no carbon residue, and convenient operation and use, liquefied petroleum gas is widely used as a gaseous fuel in the fields of people's life, metal cutting, agricultural product baking, and industrial kiln roasting. Therefore, the development of liquefied petroleum gas is highly efficient. The research and development of low-nitrogen clean staged combustion technology is one of the important links in the key breakthrough of green and low-carbon technology. [0003] The burner is the core key component of combustion. It is used for mixing and organizing combustion of gaseous fuel and supporting gas. It directly determines the three-field distribution of tem...

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Problems solved by technology

[0005] The object of the present invention is to provide a method and system for staged combustion of gaseous fuels, so as to solve the problem that the combustion method of the primary air supply in the prior art requires a large excess air coefficient, resulting in the production of more incomplete combustion products and a large number of thermal types. NOx Technical Issues

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