低阶煤低温干馏炉中低温燃烧室温度场分布模拟及结构优化

摘要

CFD Fluent 6.3 software was used to perform simulation research and structure optimization on temperature distribution in the lignite swirling low-temperature combustion chamber (1500 mm× 200 mm×1500 mm). This combustion chamber was a separate unit to complement the lignite low-temperature pyrolysis carbonization chamber. By designing two 100mm radius and 130 ° arc-shaped baffles symmetrical with the center of the combustion chamber in the coordinates of (−25, 550,0) and (25,−550,0),the average temperature of the combustion chamber (755 ℃) could meet the needs of lignite low-temperature pyrolysis (500-650 ℃). Realizable k-ε turbulence model,P-1 radiation model and non-premixed combustion model were used to calculate the temperature distribution. The simulation results were consistent with the experiment,and error fluctuation was 50-70 ℃.%用CFD Fluent 6.3软件对自主研发的与增收低温焦油炭化室相配套的褐煤热解旋流式低温燃烧室（1500 mm×200 mm×1500 mm）内温度场分布进行了模拟研究和结构优化，结果表明：在燃烧室内坐标为（−25，550，0）和（25，−550，0）处设计两个关于燃烧室中央轴对称半径为100 mm的130°圆弧形挡板，燃烧室内平均温度（755℃）满足褐煤低温热解需求（500～650℃）；Realizable k-ε湍流模型、P-1辐射模型和非预混燃烧模型适用于计算焦炉煤气和空气低温燃烧室内温度场分布，模拟计算结果与实验结果基本吻合，误差波动幅度为50～70℃，满足工业要求。