【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。更多还原

【Abstract】 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.更多还原