A device for separating and burning coarse and fine pulverized coal in a pulverized coal pipeline

Abstract

The invention provides a rough and fine coal powder separating and combusting device in a coal powder pipe. The device comprises an upper primary air pipe and a lower primary air pipe, which are vertically arranged, wherein the output end of the upper primary air pipe is connected with an upper coal powder separator; a fine coal powder output end of the upper coal powder separator is connected with an upper fine coal powder combustor through an upper fine powder pipe; the rough coal powder output end of the upper coal powder separator is sequentially connected with a mixing pipe and a lower rough coal powder combustor through upper rough coal powder pipes; the lower rough coal powder combustor is located below the upper fine coal powder combustor; the output end of the lower primary air pipe is connected with the lower coal powder separator; the fine coal powder output end of the lower coal powder separator is connected with the lower fine coal powder combustor through the lower fine coal powder pipe; the rough coal powder output end of the lower coal powder separator is connected with the mixing pipe through the lower rough coal powder pipe. Standing time of rough particle coal powder in a furnace hearth is increased, thus combustible matter content in flying ash is reduced and combustion efficiency of a boiler is improved.

Description

technical field [0001] The invention belongs to the technical field of coal-fired power generation, in particular to a device for separating and burning coarse and fine coal powder in a pulverized-coal pipeline. Background technique [0002] Coal resources are becoming increasingly scarce. In order to meet the power supply demand and control production costs, it is imperative to improve the power supply efficiency of coal-fired power plants. Among them, the combustion efficiency of boilers is one of the important factors affecting power supply efficiency. [0003] At present, in units using the direct-blown pulverization system, the pulverized coal generally enters the coarse powder separator along with the primary air for processing, and the pulverized coal with excessive particle size returns to the pulverizer for further grinding to meet the The required pulverized coal is directly sent to the burner and enters the furnace for combustion (see figure 1 ). However, the co...

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Problems solved by technology

[0005] The present invention aims at the problems of low efficiency of the coarse powder separator and high content of fly ash combustibles existing in the production process of the above-mentioned electric power enterprises, and adopts the key technology of "a method and device for separating and burning coarse and fine coal powder in a pulverized coal pipeline"

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