摘要
从热量来源 (不从传热 )角度在理论上对目前催化裂化再生器各种外取热器作了分析 ,给出了对流热和“扩散热”的计算式。研究了各种外取热器的换热效率及计算方法 ,并找出了取热器内温度明显低于再生温度 (即使在入口处也如此 )的原因 ,进而提出了改进措施。研究结果表明 ,取热器本体内传热基本上受“扩散”控制 ;催化剂循环对取热器的作用主要归于对供剂起始温度的影响 ;用流化气体使供剂管路内催化剂扩散可提高取热量 ;各种外取热器的性能差别主要表现在供剂温度上 ;供剂管路的设计和操作状态 ,对取热器内温度可产生达 10 0℃的改变 ,从而影响取热器的负荷。
Various types of external catalyst coolers of the regenerator in FCCU were analyzed theoretically in respect of heat source.The formulas for the calculation of convection heat and diffusion heat were given.Heat exchange efficiencies of various(not heat transfer) external catalyst coolers and calculation methods were studied.Causes of the temperature of the cooler(even at the inlet) being much lower than the regeneration temperature were found out and improving measures proposed.The study showed that the heat transfer in the cooler body is controlled by heat diffusion.The role of catalyst circulation was mainly to vary the temperature of the hot supply catalyst.Using fluidization gas to diffuse catalyst in the supply catalyst pipeline could enhance the heat removal rate Different performances of various external catalyst coolers are mainly shown by the different temperatures of supply catalyst.Both design and operating state of catalyst supply pipeline could result in 100℃ temperature difference of the cooler,thus affecting the heat duty of the cooler.
出处
《炼油设计》
2000年第3期37-41,共5页
Petroleum Refinery Engineering
关键词
流化催化裂化装置
再生器
传热
取热器
换热过程
fluid catalyst cracking unit,regenerator,catalyst,external,cooler,heat transfer,theoretical study
