化工学报2024，Vol.75Issue(2)：659-674,16.DOI:10.11949/0438-1157.20230681
熔渣气化炉喷嘴燃烧区行为的数值模拟研究
Numerical study on combustion zone behaviors of a slagging gasifier
摘要
Abstract
The combustion zone is an important region in a slagging gasifier,as it determines the working state of a coal gasifier.This study applies the Eulerian-Eulerian model to study the gas-coal behaviors in this region in an industrial-scale coal gasifier.The model considers the flow,heat transfer and chemical reactions for both gas and coal phases.The model is also used to explore the formation process of the combustion zone and the distribution of velocity,temperature,and species in and around it.It is found that the combustion zone is of a plume-like shape,extending to the centre of the gasifier and then towards the top obliquely;the gas velocity is about 2.5 m/s in the central regions of the gasifier,without forming a high-speed collision zone;the high-temperature zone appears near the surface of the combustion zone,especially that facing the nozzle and near the centre of the gasifier,where the temperature can reach as high as 2000℃.Besides,it is found that oxygen is mainly distributed at about 0.5 m in front of the nozzle,while the distribution of carbon monoxide and water vapor overlap in space to a large extent;carbon dioxide is mainly generated near the outer surface of the combustion region while a higher concentration of hydrogen appears above the combustion region.Along the direction of the nozzle axis,the gas temperature first increases to a peak and then gradually decreases.With increasing gasification agent flow rate,the position where the maximum value of combustion temperature appears gradually moves to the centre of the gasifier,showing an obvious linear change pattern.关键词
熔渣气化炉/煤气化/燃烧区形状/合成气/数学模拟/反应动力学Key words
slagging gasifier/coal gasification/combustion zone profile/syngas/mathematical modeling/reaction kinetics分类
能源科技引用本文复制引用
王学云,郁肖兵,彭万旺,沈岩松..熔渣气化炉喷嘴燃烧区行为的数值模拟研究[J].化工学报,2024,75(2):659-674,16.基金项目
中国煤炭科工集团有限公司科技创新创业资金专项项目(2020-2-GJHZ005) （2020-2-GJHZ005）
