Bitangent circular thick and thin separation adjustable direct-current coal powder combustor

Abstract

The invention relates to a bitangent circular thick and thin separation adjustable direct-current coal powder combustor. Horizontal thick and thin combustion and vertical thick and thin combustion can be realized simultaneously in one set of combustor so that the generation amount of NOX is reduced by 10%-20% when being compared with that of a single combustion manner; the thick and thin separation is realized by using a blind window; after thick and thin coal powder is stabilized by a separation plate, the thick and thin coal powder is separated by a wave-shaped blunt body so that the combustion is stabilized by enhancing the disturbance and the heat expansion at a room temperature is reduced; a bitangent circular combustion manner is adopted to form a powder-in-wind effect in a furnace and the mixing of primary wind and secondary wind is delayed; the oxygen supply amount at the primary period of combustion is reduced and the generation of NOX is inhibited; meanwhile, slag bonding of a furnace wall and high-temperature corrosion are prevented. The arrangement manner of the bitangent circular thick and thin separation adjustable direct-current coal powder combustor has the advantages of strong ignition stability, good anti-caking property, high combustion efficiency, low NOX generation, wide coal types and load adaptability and the like.

Description

technical field [0001] The invention relates to an arrangement method of a double tangential circular thick-thin separation adjustable direct-flow burner, and relates to the field of clean combustion of pulverized coal in industrial boilers and small-tonnage power station boilers. Background technique [0002] In order to meet my country's increasingly stringent environmental protection requirements, the current low NO X Combustion technology has been widely used in coal-fired boilers in power stations. However, in the field of industrial boilers and small-tonnage power plant boilers, NO X The emission control of large power plant boilers is weaker than that of large power plant boilers, and most of them copy the low NO of large power plant boilers X combustion technology. For newly designed boilers, the current trend is to develop fuel and air staged combustion technology, lack of detailed and in-depth research; for existing boilers, mainly adopt low NO X Burner retrofi...

AI Technical Summary

Problems solved by technology

This is faced with many problems, the main ones are: (1) Only one of the vertical rich-thin burner and the horizontal thick-thin burner can be selected, not both, NO X The control of the amount of production has not been minimized; (2) The vertical thick-lean burner currently used, the separation of the thick-lean coal powder is generally achieved by the centrifugal force of the elbow, the reconstruction of the pulverized coal pipeline requires a large amount of work, and the damage to the furnace wall of the original boiler is large ; Even if there are louvers, they are fixed in the burner body. Once the construction and installation are completed, the concentration of the dark and light phases cannot be adjusted; (3) At present, boilers generally use large bellows type burners, and the secondary air adjustment is rough.

(4) Poor adaptability of burner coal type

(5) Poor load adaptability

Generally speaking, the thermal load adjustment of power plant boilers is relatively frequent, and the primary air concentration varies greatly under different thermal loads, which is not good for combustion. Therefore, the thick-lean burner needs to adjust the primary air velocity and coal powder concentration according to different loads; Optimal NO under different load conditions X Generated amount; (7) The structure is complex, not easy to maintain, not easy to replace

Images