摘要
在直径为1000mm,高4000mm的双通道射流喷嘴的气化炉上,以Texaco气化炉冷模试验为基准对象,将空气经环隙和中心射入气化炉,以氢气为示踪剂,预测环隙和中心射流的混合程度。结合流体质量与动量守恒方程和k-ε湍流模型,用SIMPLER算法计算,对气化炉内的冷态流场和湍流混合进行了模拟,模拟了炉内速度分布、量纲一浓度分布、混合分数分布和轴向衰减的情况。结果显示:气化炉内浓度分布极不均匀;炉内存在富氧和贫氧区;环隙和中心通道射流动量比加大,混合分数沿轴向衰减加快,达到充分混合的时间缩短。模拟结果与冷模试验结果的比较表明计算值与试验值吻合良好。
A dual-channel jet nozzle cold model for Texaco gasifier with diameter of 1 000 mm and height of 4 000 mm was used as the benchmark. The air was injected into the gasifier through the annular and concentric channel of the nozzle,and the hydrogen was injected as a tracer for tracking the extent of mixing. The SIMPLER algorithm was used to solve the fluid mass and momentum conservation equations which were coupled with the turbulent model. The cold-low field and turbulent mixing in the gasifier were simulated. The simulation calculated the distributions of gas velocity,dimension one concentration and mixture fraction,and the decay along the axial direction. The results show that the distribution of gas concentration is non-uniform,and a rich and a poor oxygen region exist in the gasifier. The mixture fraction decreases quickly along the axial direction,and the time required for perfect mixing shortens with increasing jet momentum ratio of annular to concentric jet. The simulation results agree with the experiment of cold flow.
出处
《化学工程》
CAS
CSCD
北大核心
2010年第5期30-33,共4页
Chemical Engineering(China)
基金
国家自然科学基金资助项目(20876049)
