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长庆气田是向京津地区供气的基地,净化厂正常运行至关重要。长庆气田天然气第二净化厂MDEA脱硫装置拦液情况频繁发生,严重影响了装置高效、平稳运行。同时,溶液发泡还会引起雾沫夹带,导致大量胺溶液随气流被带走,使溶液损耗急剧增加,造成了严重的经济损失。通过对塔板负荷性能参数的验算和对脱硫溶液及原料气组分的分析研究,找到了脱硫溶液严重发泡是造成脱硫装置拦液的真正原因。初步研究表明,脱硫溶液污染、脱硫溶液高的CO₂负荷及原料气处理量的突然增大是造成脱硫液发泡严重的主要因素。结合现场实际情况,提出了脱硫装置发生拦液后的初步处理措施。

STUDY ON FOAMING REASONS OF MDEA DESULFURATION SOLUTION IN SECOND GAS PURIFICATION PLANT OF CHANGQING GAS FIELD (1) --LIQUID-BLOCKING CAUSES IN DESULFURATION UNIT

Changqing Gas Field is the base to deliver gas to the areas of Beijing and Tianjing. It is very important for purification plants running normally. The liquid-blocking incidents of MDEA desulfuration unit occur frequently in the second gas purification plant of Changqing gas field, which influence efficient and smooth operation of the unit seriously. Also, the solution foaming will induce fog carrying and result in excessive amine solution losing, which will lead serious economic loss. By the verification of load performance parameters and the composition analysis of the desulfuration solution and the feed gas, it is found the real reason of liquid blocking by desulfuration unit is the desulfuration solution seriously foaming. The preliminary study shows the fiercely foaming is contributed mainly by the following factors: The desulfuration solution is polluted; the desulfuration solution has heavy CO 2 loading; the flow rate of feed gas increases suddenly. According to the field situation, the preliminary countermeasures are proposed when liquid blocking happens in the desulfuration unit.