Coal-water slurry feeding device and boiler for multi-process circulating fluidized bed boiler

Abstract

The invention relates to a coal water slurry feeding device for a multi-flow circulating fluidized bed boiler and the boiler. The coal water slurry feeding device comprises a slurry supply pump (1), a slurry supply pipe (2), a coal water slurry granulator (3) and secondary air ports (5), wherein the slurry supply pipe (2) is communicated with the slurry supply pump (1), and the other end of the slurry supply pipe (2) is communicated with the coal water slurry granulator (3) distributed at the top of a main combustion chamber (4); the secondary air ports (5) are distributed in positions close to tops of side walls of an auxiliary combustion chamber (6); a sprayer (33) of the coal water slurry granulator (3) is arranged in the hearth of the main combustion chamber (4), fixed at the lower end of a movable part (32) and can rotate along with the movable part (32); coal water slurry can be sprayed in a slurry droplet form under the centrifugal force of the sprayer (33). The coal water slurry feeding device has the advantages that coal water slurry droplets can be easily decomposed and pyrolyzed, the coal water slurry droplets can be evenly distributed, low-temperature combustion is facilitated, raw material requirements on coal quality can be lowered greatly, and cost is saved; uncombusted coal water slurry particles can be combusted sufficiently favorably, and combustion efficiency is increased.

Description

technical field [0001] The invention relates to the field of boilers, in particular to a coal-water slurry feeding device and a boiler for multi-flow circulating fluidized bed boilers. Background technique [0002] Coal water slurry was developed in the 1980s. It is mainly made of cleaned coal (about 67%) after washing, water (about 32%) is used as auxiliary material, and about 1% of chemical additives are added. It is a low-pollution, high-efficiency new clean coal-based fuel, which has the fluidity and stability similar to oil, and can be easily transported, loaded, unloaded, and stored. [0003] There are two main ways of burning coal water slurry: [0004] The first combustion method is atomization-suspension combustion, which is the main combustion method of coal-water slurry boilers, that is, coal-water slurry is sprayed into the furnace for combustion through the burner, and steam or compressed air is used as the atomization medium at the same time. The combustion t...

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Problems solved by technology

[0008] The purpose of the present invention is to provide a coal-water slurry feeding device and a boiler for a multi-process circulating fluidized bed boiler, which can not only solve the problem of slagging in the combustion of coal-water slurry, but also realize direct desulfurization, Nitrogen removal, reducing the cost of making coal water slurry, eliminating the need for a more complicated atomization system; and can improve the uneven distribution of droplet coal water slurry put into the furnace and the water coal that is taken out of the main combustion chamber by the flue gas The current situation that the slurry particles are difficult to fully burn, so that the coal water slurry particles can be fully burned

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