渣油加氢裂化未转化油蒸汽发生器传热计算及操作优化

HEAT TRANSFER CALCULATION AND OPERATION OPTIMIZATION OF STEAM GENERATOR FOR RESIDUE HYDROCRACKING UNCONVERTED OIL

渣油加氢裂化未转化油在温度或流速降低时易发生聚结和沉积而导致换热器堵塞。通过对螺旋板蒸汽发生器进行传热计算,探究工艺参数对油侧出口温度和流速的影响效果。结果表明:螺旋板蒸汽发生器的总传热系数受油侧传热系数的限制;未转化油的出口温度和流速随换热面积余量增大而降低,而随污垢热阻、热负荷、水侧操作压力的增大而提高,在实际操作中可通过水侧压力进行有效调节。

In residue hydrocracking process,the unconverted oil easily agglomerates and deposits when its temperature or flow velocity is reduced,leading to the plugging of heat exchangers.Through heat transfer calcultation of spiral plate steam generator,the impact of different process parameters on oil side outlet temperature and flow velocity is investigated.The results show that the total heat transfer coefficient of spiral plate steam generator is restricted by oil side heat transfer coefficient.The outlet temperature and flow velocity of unconverted oil will reduce with the increase in heat exchanger design margin and improve with the increase in fouling resistance,heat duty or water side operating pressure.In pracitce,the oil side outlet temperature and flow velocity can be effectively regulated by adjusting water side operating pressure.