废液焚烧炉内燃烧过程及污染物排放特性数值模拟

Numerical Investigation of the Characteristics of Combustion Process and Pollutant Emissions in a Wastewater Incinerator

中文关键词: 废液焚烧炉  数值模拟 过量空气系数  氮氧化物

英文关键词: Wastewater incinerator  Numerical simulation  EA  NO_x

中文摘要:

      应用FLUENT软件对某炼化企业处理量为10t?h–1的废液焚烧炉燃烧过程进行三维数值模拟，获得了焚烧炉炉膛内流场、温度场、各组分浓度分布、污染物生成及火焰形状等信息，揭示了炉膛内燃烧、流动以及传热与传质的特点。模拟不同过量空气系数下工业有机废液在炉内燃烧情况，结果表明：随着过量空气系数（EA）的增加，炉膛内温度峰值逐渐减小，炉膛温度分布更加均匀，燃烧区域增大，炉膛出口截面平均NOx浓度逐渐升高；在EA=1.25的情况下，炉膛出口排烟温度合理，氮氧化物排放浓度较低；模拟结果与试验数据吻合，验证了模型的可靠性，为优化设计操作工况及污染物的控制提供可靠依据。

英文摘要:

      Comprehensive 3D numerical simulation of combustion process of a 10 t?h–1 wastewater incinerator in a petroleum refinery has been performed by FLUENT, complicated flow, temperature distribution, pollutant emissions, component concentration distributions and the shape of the flame have been studied. The results reveal the characteristics of combustion, flow and heat transfer, mass transfer. Simulations of combustion in the furnace under the conditions of different EA values have been performed; the results show that with the increasing coefficient of excess air (EA), the peak temperature in the furnace decreases gradually, temperature distribution becomes more uniform, area of combustion zone increases. Furthermore, average NOx concentration of the wastewater incinerator outlet becomes higher gradually with EA increasing. While EA=1.25, the outlet temperature is reasonable and the NOx concentration is low enough. Simulation results agree with the test data, which verify the reliability of the model, providing reliable basis for optimizing the designed operation condition and pollutant control.