FIRE-CHAMBER WITH CIRCULATING BOILING BED Russian patent published in 2014 - IPC F23C10/20 

FIELD: power engineering.

SUBSTANCE: invention can be used for combustion of low-quality solid fuels in power production, chemical and petrochemical industries, et. Proposed device comprises combustion chamber with fuel feeder and air box arranged under said combustion chamber. Air distribution sink grate with drain ash bin connected with screw ash remover is located atop said chamber. Said grate consists of air feed pipes equipped with caps with round holes. Said grate is divided into sections with separate ash drain bins built in air box. Note here that quantity of bins is defined in compliance with the ratio between steam output of one grate section ("Д"_section) and total steam output of the boiler ("Д"_boiler). Note also that total cross-section of cap outlets (Σf_out, m²) makes at least 2% of the grate total across-section (F_g, m²). Note that side faces of ash drain bin are inclined at, at least 55 degrees to horizontal line and connected to screw ash remover.

EFFECT: uniform air distribution and removal of coarse ash particles, ruled out grate clogging, higher reliability and efficiency.

3 dwg