Abstract:

Aiming at the problems of high {\mathrm{C}}_{\mathrm{3}}^{+} content and low LPG yield in dry gas of delayed coking unit, the present situation and development trend of absorption and stabilization technology are reviewed. By analyzing and comparing the absorption performance of coker naphtha and stabilized gasoline, a new technology of segmented feeding in absorption tower is put forward. The technological route of the new process was expounded, and the position of the feeding section and the application effect of the structured packing were studied. Based on the comparison of thermodynamic methods, the simulation calculation and analysis are carried out. The results show that the new process technology greatly reduces the content of {\mathrm{C}}_{\mathrm{3}}^{+} in dry gas compared with the traditional technology. Moreover, the design of segmented feeding technology and the modification scheme of the structured packing arrangement of absorption tower are introduced for the coking absorption and stabilization industrial device of an enterprise, and the industrial application is carried out. The application results show that the new technology can reduce the content of {\mathrm{C}}_{\mathrm{3}}^{+} in dry gas by 1 to 2 percentage points, and the yield of LPG is obviously increased, with remarkable economic benefits.

Key words: absorption stability, structured packing, stabilized gasoline, dry gas

摘要：

针对当前延迟焦化装置干气中{\mathrm{C}}_{\mathrm{3}}^{+}组分含量偏高、液化气收率低的问题，本文回顾了吸收稳定技术现状和发展趋势。并通过分析对比焦化粗汽油和稳定汽油吸收性能，提出了吸收塔分段进料新工艺技术。阐述了新工艺技术路线，研究了新工艺分段进料位置、规整填料应用效果。在对比热力学方法的基础上进行模拟计算和分析，结果说明新工艺技术较传统技术大幅降低干气中{\mathrm{C}}_{\mathrm{3}}^{+}组分含量。并且就某企业焦化吸收稳定工业装置，介绍了分段进料工艺技术设计和吸收塔填料布置改造方案，进行了工业应用。应用结果表明：新工艺技术可降低干气中{\mathrm{C}}_{\mathrm{3}}^{+}组分含量1~2个百分点，液化气收率明显上升，经济效益显著。

关键词: 吸收稳定, 规整填料, 稳定汽油, 干气