催化裂化吸收稳定系统低温节能工艺开发初探

摘要

A FCC absorber-stripper-stabilizer system was simulated and calculated based on the process data collected from a refinery. Single factor study and two-factor study were conducted to investigate the effects of temperature of cycle gasoline and equilibrium tank on the streams and energy consumption of the absorption-stabilization system. Theoretical data for the low temperature and energy conservation process to be developed were obtained by this research. With the decrease of cycle gasoline temperature from 40℃ to 5℃, vapor and liquid mass flow rates of equilibrium tank and cycle gasoline decreased, and also energy consumption decreased by about 16%. At a series of cycle gasoline temperature, energy consumption presented a U-shaped curve while equilmibrium tank temperature rose. Within 35—55℃, the lowest point represented optimum energy consumption at this cycle gasoline temperature. The effect of cycle gasoline temperature decrease on system energy consumption was gradually reduced. Therefore, besides optimal operating temperature, energy saving equipment cost and operation cost for the process shall be evaluated to develop an economical low temperature and energy conservation process of absorption-stabilization system.%以某炼油厂催化裂化吸收稳定系统工艺数据作为模拟和计算的基础，从单因素和双因素角度研究了循环汽油温度及平衡罐温度对吸收稳定系统物流及能耗的影响，为后续低温节能工艺开发提供了依据。研究结果表明，随着循环汽油温度由40℃逐步降至5℃，平衡罐气液相及循环汽油质量流率下降，系统能耗下降约16%。系列循环汽油温度下，随着平衡罐温度的上升，系统能耗均呈现正U形曲线趋势，在35～55℃范围内出现系列最低点，即该循环汽油温度下系统能耗最优点。随着循环汽油温度的降低系统能耗逐渐减小。因此，除了考察适用的最优操作温度外，还需综合评估工艺匹配的节能设备投资及操作费用，才能开发经济性最优的吸收稳定系统低温节能工艺。