低返混喷射态塔盘在伴生气脱硫工艺中的应用

Application of low backmixing spray state tray in associated gas desulfurizing process

关键词:  伴生气  脱硫  低返混  喷射态塔盘  MDEA

Key words:  associated gas  desulfurization  low backmixing  spray state tray  MDEA

摘要:

西北油田高含硫伴生气在采用甲基二乙醇胺(MDEA)溶液脱硫净化过程中存在频繁的拦液冲塔及净化气中H₂S浓度超标等问题。分析结果表明,其主要原因是伴生气体系中重烃含量高导致胺液易发泡及塔板效率低。提出并设计了一种基于喷射态原理的新型逆流低返混喷射态塔盘结构(SDST)。水力学试验结果表明,相比F1浮阀塔盘,SDST压降可降低10%,通量可提高30%,操作弹性基本不变。SDST塔盘在伴生气脱硫过程的工业应用结果表明,SDST塔盘具有良好的抑制发泡性能,可有效解决伴生气脱硫过程的拦液冲塔问题,同时,塔板效率提高10%以上,有效解决了伴生气脱硫过程中因塔板效率低导致的净化气中H₂S浓度超标问题。 

Abstract:

In the Northwest oilfield, there were some problems for high sulfur-containing associated gas during the desulfurization and purification of dimethylethanolamine (MDEA) solution, such as frequent liquid blocking and flushing tower and the hydrogen sulfide concentration in the purified gas over-standard, etc. The analysis results showed that the high heavy hydrocarbon content in the associated gas system was one of the causes which led to the amine solution foaming and low tray efficiency. A new counter current low backmixing spray state tray structure (SDST) based on the principle of spray state was proposed and designed. The hydraulic test results showed that compared to the F1 float valve tray, the SDST pressure drop could be reduced by 10%, the flux could be increased by 30%, and the operation flexibility was basically unchanged. The industrial application results of SDST trays in associated gas desulfurization process showed that SDST tray has a good foaming suppression performance, which can effectively solve the problem of liquid blocking and flushing tower in associated gas desulfurization process, and at the same time increase the plate efficiency by more than 10%, and also effectively solve the problem of hydrogen sulfide concentration over-standard in the purified gas caused by the low tray efficiency during the associated gas desulfurization process.