Four-time inflation and combustion method for coal burning boiler

Abstract

The invention discloses a four-time inflation and combustion method for a coal burning boiler and belongs to the technical field of combustion in a coal burning boiler. The processing steps are as follows: supplying air for the first time, supplying fire coal at a uniform speed through a mechanical coal feeding device according to the fire coal quantity needed for combustion in the boiler, so that the coal can be naturally gasified, coked and burned to generate a large amount of carbon monoxide and other combustible substances; supplying air for the second time 8-10 minutes after supplying air for the first time, and carrying out mixed burning on the air supplied at the second time and carbon monoxide, thereby further increasing the boiler temperature; supplying air for the third time, and enabling the coal to be sufficiently burned inside; and finally mixing fume, and oxygen forcibly inflated by a fourth-time air-supplying burner at the fire outlet of a hearth, so that the combustible substances in exhaust gas are sufficiently burned in a high-temperature and high-oxygen condition. The four-time inflation and combustion method for the coal burning boiler has the beneficial effects of energy conservation, high thermal efficiency, stable combustion, high adaptability to various coals, low flue dust concentration and flue gas blackness, and good environmental friendliness.

Description

technical field [0001] The invention relates to a coal combustion method, in particular to a four-time aeration combustion method for a coal-fired boiler, belonging to the technical field of coal-fired boiler combustion. Background technique [0002] Because coal-fired boilers are widely used due to their high efficiency and low cost, the traditional coal combustion method will produce a large amount of pollutants during the coal combustion process, causing serious environmental pollution. The main reason is: coal is not easy to fully contact with oxygen to form incomplete combustion, the combustion efficiency is low, and the pollution emission is relatively increased; the combustion process is not easy to control, for example, when a large amount of volatile components are precipitated, the oxygen supply is often insufficient, resulting in the precipitation of smoke and black smoke; When solid fuel is burned, the temperature is difficult to be uniform, forming a local high ...

AI Technical Summary

Problems solved by technology

[0002] Because coal-fired boilers are widely used due to their high efficiency and low cost, the traditional coal combustion method will produce a large amount of pollutants during the coal combustion process, causing serious environmental pollution

The main reasons are: coal is not easy to fully contact with oxygen to form incomplete combustion, the combustion efficiency is low, and the pollution emission is relatively increased; the combustion process is not easy to control, for example, when a large amount of volatile components are precipitated, the oxygen supply is often insufficient, resulting in the precipitation of smoke and black smoke; When solid fuel is burned, the temperature is difficult to be uniform, forming a local high temperature zone, which promotes the formation of a large amount of NOx; this wastes energy and pollutes the environment