燃气锅炉污泥气化气体燃烧过程数值模拟  

Numerical Simulation of Combustion Process in a Gas-fired Boiler with Sewage Sludge Gasified Gas

作　　者：张臻荣 黄亚继[1] 王新宇[1] 朱志成 刘洋[1] 杨晓域 田新启[1] ZHANG Zhenrong;HUANG Yaji;WANG Xinyu;ZHU Zhicheng;LIU Yang;YANG Xiaoyu;TIAN Xinqi(Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education,Southeast University,Nanjing 210096,China)

机构地区：[1]东南大学能源热转换及其过程测控教育部重点实验室,南京210096

出　　处：《动力工程学报》2021年第10期824-832,共9页Journal of Chinese Society of Power Engineering

基　　金：国家重点研发计划资助项目(2018YFC1901205)。

摘　　要：采用Ansys Fluent软件模拟了1个基础工况与8个对比工况下污泥气化气体在某燃气锅炉炉内的流动及燃烧过程。结果表明:炉内气流旋转上升的同时剧烈燃烧;基础工况下底部喷口截面最高平均温度可达1 200 K;改变空气和燃气入口速度对炉内燃烧温度以及氧气、二氧化碳体积分数有较大影响;增大燃气入口速度后,底部喷口截面平均温度达到1 300 K,该区域平均氧气体积分数明显减小;污泥气化气体中可燃组分增大会使炉内燃烧反应加剧,燃气中一氧化碳体积分数增大到18%时,底部喷口截面平均温度达到1 400 K,但对大部分炉膛高度下的平均氧气体积分数和平均二氧化碳体积分数的影响较小。Flow and combustion process of sewage sludge gasified gas under one design condition and eight reference conditions in the furnace of a gas-fired boiler were simulated by Ansys Fluent soft. Results show that the gas in the furnace rotates and rises while burning severely. The maximum temperature in bottom nozzle section under design condition can reach 1 200 K. Air and gas inlet velocities have significant influence on the combustion temperature and the concentration of oxygen and carbon dioxide in the furnace. The average temperature in bottom nozzle section reaches 1 300 K and the average oxygen concentration decreases significantly with the increase of gas inlet velocity. The combustion reaction is intensified by increasing the combustible components. With the increase of carbon monoxide concentration up to 18% in the gas, the average temperature in bottom nozzle section can reach 1 400 K, but it has little influence on the average oxygen and carbon dioxide concentration at the most furnace heights.

关 键 词：燃气锅炉 污泥气化气体 燃烧温度 氧气 二氧化碳 数值模拟 

分 类 号：TK229.8[动力工程及工程热物理—动力机械及工程]