热力发电Issue(8)：62-67,6.DOI:10.3969/j.issn.1002-3364.2015.08.062
水对氧煤燃烧方式下煤粉热解及燃烧过程的影响
Effect of water on pyrolysis and combustion process of coal during oxy-coal combustion
摘要
Abstract
To investigate the effect of high concentration water on coal volatilization,char gasification,char particle burnout and CO generation during wet oxy-coal combustion,the coal pyrolysis and combustion ex-periments were carried out in simulated flue gas atmospheres on a self-built drop tube furnace,with the particle residence time in the reactor of 0.2 s,0.3 s and 0.5 s.The pyrolysis tests were conducted in pure N2 atmosphere,pure CO2 atmosphere and CO2 with different concentrations of steam atmosphere.On this basis,the combustion tests adopt O2 with volume fraction of 5%,10%,21% and 30% to take place the N2 or CO2 in the pyrolysis atmospheres.the residence time of coal particles in the reactor during each test is 0.2 s,0.3 s and 0.5 s,respectively.The results indicate that,compared with air combustion,high concen-tration CO2 during oxy-coal combustion can inhibit the devolatilization of coal.The addition of high concen-tration H2 O during oxy-coal combustion can enhance the early stage devolatilization of coal,and the gasifi-cation reaction between char and H2 O or CO2 didn't occur during the pyrolysis.The water nearly had no effect on burnout rate of the coal under conditions with high O2 concentration and long enough residence time,but it did decrease the burnout rate of coal under conditions with low oxygen concentration.The wa-ter can enhance the oxidation of CO,thus the CO concentration in the furnace was reduced.关键词
氧煤燃烧/水/热解/脱挥发分/燃尽率/CO/停留时间/沉降炉Key words
oxy-coal combustion/water/pyrolysis/devolatilization/burn out rate/CO/residence time/drop tube furnace分类
能源科技引用本文复制引用
罗嘉,张曦,吴望晨,王超,刘小伟..水对氧煤燃烧方式下煤粉热解及燃烧过程的影响[J].热力发电,2015,(8):62-67,6.基金项目
国家自然科学基金项目(51276072) （51276072）
国家重点基础研究发展计划(973计划)(2013CB228501) （973计划）
煤炭联合基金重点项目(U1261204) （U1261204）
