Flameless combustion of high preheated pulverized coal
LIU Wen
OUYANG Ziqu
CAO Xiaoyang
MA Hongzhou
Abstract：A fuel preheating technique was proposed to achieve coal flameless combustion and de-NOxemissions.Experimental research was carried out with Shenmu bitumite, and coal preheated characteristic and variation law of flue gas compositions in flameless combustion were discussed.The results show that Shenmu bitumite can be preheated up to above 800℃, and the high-temperature coal gas generated by coal preheating has strong reducing action, which contains mainly CO, H2, CH4, N2and CO2.Stable flameless combustion can be achieved with preheated fuels in down-fired combustor, and the temperature distribution is uniform and the peak temperature is low in combustor.NOxis generated near the fuel nozzle and reduced mainly in the main combustion zone, and the final NOxemission value is 107.64 mg/Nm3 (@6％O2) .The generation of NO can be controlled and NOxyield can be reduced by rational combustion organization.
Keywords：NOxpreheatflameless combustioncoal
Publication Date：2019-01-01
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：7( 14-20 )