Combined combustion system for circulating fluidized bed

Abstract

The invention discloses a combined combustion system for a circulating fluidized bed and solves the technical problem of low load response speed of circulating fluidized bed boilers. The system comprises a circulating fluidized bed combustion chamber (1); an air distribution plate (2) is arranged in the circulating fluidized bed combustion chamber (1); a return device is arranged on the outer side wall of the circulating fluidized bed combustion chamber (1); an as-fired coal material is arranged in the circulating fluidized bed combustion chamber (1); a pulverized coal delivery pipe (4) is connected onto a return leg (3) of the return device; the other end of the pulverized coal delivery pipe (4) communicates with a pulverized coal bin (5); pulverized coal is arranged in the pulverized coal bin (5); a pulverized coal delivery air pipe (6) is connected onto the pulverized coal delivery pipe (4); and the ratio of the quantity of the as-fired coal material of a circulating fluidized bed boiler to the quantity of the pulverized coal delivered by the pulverized coal delivery pipe (4) is 9:1. The load response capability of the fluidized bed boiler is improved.

Description

technical field [0001] The invention relates to a circulating fluidized bed used for thermal power generation, in particular to a combustion system of the circulating fluidized bed. Background technique [0002] At present, the load response rate of circulating fluidized bed boilers used in known thermal power plants is relatively slow, and it is difficult to make a quick response to the automatic power control system (AGC) of the grid. Compared with the particle size of the coal fed into the pulverized coal furnace, the particle size is larger, the heat energy released by combustion is slower, and the heat load response speed lags behind. With the popularization of smart grid and the increasing share of fluidized bed boiler power generation in the grid, the proportion of fluidized bed units participating in grid peak regulation is increasing, and the defects of fluidized bed boilers' rapid response to grid load have become increasingly prominent. Contents of the invention...

AI Technical Summary

Problems solved by technology

[0003] The invention provides a circulating fluidized bed composite combustion system, which solves the technical problem of slow load response rate of circulating fluidized bed boilers

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