焦化炉处理量上限理论分析

焦化炉是延迟焦化装置的核心单元设备 ,也是整个装置提高处理量的制约因素。对 5座焦化炉进行了现场标定和管内外过程模拟 ,在控制炉管结焦速率的情况下 ,对单面辐射焦化炉的处理量上限进行了分析。结果表明 ,以现场操作工况下平均热强度和 1984年设计规范中冷油流速上限为基准时 ,4座单面辐射焦化炉的单炉处理量可分别提高到 6 0 0～ 6 5 0kt/a和 70 0～ 85 0kt/a,而炉出口热转化率仍低于炉管内重油的最大可裂化度。如将炉出口热转化率限制在 2 0 %,分别以操作工况下炉管平均热强度和 1984年设计规范中平均热强度上限为限制条件时 ,4座单面辐射焦化炉的单炉处理量可分别提高到 6 80 .8～ 796 .8kt/a和 76 4～ 110 0kt/a。

Analysis on maximum throughput of single side radiation coking heater

Under the status of controlled coking rate of inner tube, the design and operation data of five coking heaters were applied to simulate the heating process of inner and outside of tubes in coking heater. At different criterions such as average heat intensity of operation condition, the maximum cold oil velocity in the tube and the top conversion at exit of heater, the maximum throughputs of coking heaters were obtained. The key process parameters such as average heat intensity, pressure drop, residence time of oil in the inner tube and heat conversion at exit of different coking heaters were also achieved.