Chain grate boiler with full-coverage front arch

Abstract

The invention relates to a chain grate boiler with a full-coverage front arch. The boiler comprises a chain grate, a coal hopper, a full-coverage front arch arranged in a hearth from front to back, a combinational secondary air spray pipe arranged on the side wall of the hearth at the lower part of the full-coverage front arch and a smoke guide arch for guiding the high-temperature smoke gas to the upper hearth. After entering the hearth along with the grate, raw coal is on fire rapidly under heat radiation of the full-coverage front arch, flame and high-temperature smoke gas generated during combustion of raw coal crosses over from front to back along the coal bed of the whole chain grate and flows out from an outlet at the rear part of the hearth so that the coal bed on the whole chain grate at the lower part of the full-coverage front arch is in a high-temperature state, and high combustion efficiency is realized. At the same time, air fed from a blower is sprayed over the coal bed at the lower part of the long front arch through the combinational secondary air spray pipe, so that the situation that the volatile matter of raw coal generates black smoke due to oxygen deficiency in the combustion process can be avoided.

Description

technical field

[0001] The invention relates to the field of boilers, in particular to a chain grate boiler with a fully covered front arch. Background technique

[0002] At present, the chain grate boiler adopts a combined furnace arch structure with a short front arch and a long rear arch, and the front arch is higher than the rear arch. For some low-quality raw coal with high volatile content and low carbon content, after the volatile content is burned out, the combustion of the remaining carbon particles is not enough to ensure that the furnace under the rear arch has a high temperature, and it is impossible to realize the ash in the ash. The carbon particles are continuously and efficiently burned in the furnace under the rear arch, resulting in high carbon content in the ash, which cannot guarantee the normal output of the boiler, and also greatly reduces the thermal efficiency of the boiler. Chain grate boiler is a widely used boiler type, its operating energy consum...

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