A multi-angle tangential circle multi-scale pulverized coal decoupling combustion device and its decoupling combustion method

Abstract

The invention relates to a multi-corner tangential multi-scale pulverized coal decoupling combustion device and a decoupling combustion method thereof; based on pulverized coal combustion characteristics and substance transformation rules, in a microcosmic scale, each column of primary air nozzles (3) on a multi-corner tangential combustion furnace hearth is arranged in a manner that at least 2 or more than 2 nozzles are centralized and adjacent to each other up and down, and the nozzles (3) are relatively centralized at an area in the hearth close to the flame center and with a very high temperature, so multi-area horizontal front-and-back fractional combustion is realized; in a medium scale, second-stage secondary air nozzles (1) are arranged in a local centralization mannerto form a strong reducibility area and a weak reducibility area or a weak oxidability area respectively before and after mixing with the primary air nozzles (3), so multi-area horizontal left-and-right fractional combustion is realized; in a macroscopic scale, peripheral over-fire air nozzles (8) and center over-fire air nozzles (9) are disposed to respectively form a reducibility area and an oxidability area at the lower and upper parts of the hearth, so vertical up-and-down air fractional combustion is realized.

Description

technical field [0001] The invention relates to the field of pulverized coal combustion equipment. Specifically, the invention relates to a multi-angle tangential circle multi-scale pulverized coal decoupling combustion device and a decoupling combustion method thereof. Background technique [0002] In the practical application of pulverized coal combustion, with the increase of the combustion temperature and oxygen concentration of the pulverized coal-air mixture in the combustion stage, the pulverized coal is more likely to be burned quickly and fully, and the fly ash combustibles (unburned carbon and CO ) content is reduced; at the same time, high temperature oxygen enrichment will make the NO produced in the combustion process x On the other hand, the lower the combustion temperature and oxygen concentration of the pulverized coal-air mixture in the combustion stage, the better the suppression of nitrogen oxides NO x Generated, but coal dust is less likely to burn out. ...

AI Technical Summary

Problems solved by technology

[0009] In addition, in the traditional four-corner tangential combustion furnace, the burner usually swings vertically up and down to adjust the height of the center of the flame, thereby adjusting the temperature of the main and reheated steam. The excessively large swing angle of the air nozzle makes the pulverized coal scouring and wearing the nozzle working at high temperature very seriously, and the life of the burner is greatly reduced

Moreover, because there are many connecting rod transmissions on a set of mechanisms, the requirements for keeping the length of the connecting rods and the positioning of the pin shafts are relatively high. However, due to the irregular thermal expansion of the furnace body and the burner bellows, the failure rate of the swing device Very high, often loses its effect for a long time, affecting the combustion characteristics of the boiler

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