论文部分内容阅读
气流床气化–废锅流程具有较高的热效率并可副产一定量蒸汽,适宜于整体气化联合循环(IGCC)发电或无需合成气变换的工况。文中对常用于气态/液体烃气流床气化的工业火锅式余热锅炉管板冷却室建立了三维数值模型。采用Realizable k-ε模型模拟了湍流流动过程,用离散坐标模型(DOM)计算了合成气辐射传热过程,耦合研究了流体与固体壁面间的流动和传热过程。考察了冷却水入口形式、冷却水流量和出口环隙宽度对冷却室内流动传热过程的影响。结果表明,3冷却水入口的形式能够有效改善合成气管水侧壁面的冷却效果,同时获得更均匀的冷却室内速度、温度分布。现有的2冷却水入口形式下,优化的冷却水质量流量为200 t/h。此外,在合成气管道的入口处加入刚玉套管能够使合成气管道壁面的最高温度降低106 K,有效保护合成气管端部。
The entrained-waste-wok process has high thermal efficiency and can produce a certain amount of steam by-product. It is suitable for IGCC generation or without syngas conversion. In this paper, a three-dimensional numerical model is established for the cooling chamber of the tube plate of industrial pot-type waste heat boiler commonly used in gas / liquid hydrocarbon entrained gasification. The Realizable k-ε model was used to simulate the turbulent flow process. The radiative heat transfer of the syngas was calculated by the discrete coordinate model (DOM), and the flow and heat transfer between the fluid and the solid wall were investigated. The influences of cooling water inlet form, cooling water flow and exit annulus width on the flow and heat transfer in the cooling chamber were investigated. The results show that the form of 3 cooling water inlet can effectively improve the cooling effect of the water side wall of the synthetic gas pipe and achieve more uniform cooling chamber velocity and temperature distribution. With the existing 2-chilled water inlet, the optimized mass flow of cooling water is 200 t / h. In addition, the addition of corundum bushing at the inlet of the syngas pipeline can reduce the maximum temperature of the synthetic gas pipeline wall by 106 K, effectively protecting the end of the syngas pipe.