Experimental research of controllable pulverized coal rich/lean swirl combustion technology

摘要

A new technology of Controllable Pulverized Coal Rich/Lean Swirl Combustion, developed by Zhejiang University, is introduced in this paper. The technology is used for the low load flame stabilization of pulverized coal without support oil,prevention of furnace wall slagging and low NO{sub}x emission. The pulverized coal in primary air is separated into two ring-type streams of air-coal flow, one(inner ring) is the rich pulverized coal stream and other(outlet ring) is the lean pulverizedcoal stream. Rich pulverized coal stream is guided to the boundary of high temperature recirculation zone. Lean pulverized coal stream is located outside of the rich pulverized coal stream. The experimental results show that the rich/lean ratio is up to5-7:1, pressure loss is about 400-500Pa. The application has been achieved on no.2 boiler in Hefei Power Plant.