胺液脱硫系统再生性能下降原因分析及对策

中国石化茂名分公司两套胺液集中再生装置出现异常,再生后贫液中ρ(H_2S)达到2.0~3.0 g/L,远高于1.2g/L的工艺设计值。通过在实验室模拟装置上考察新鲜脱硫剂的吸收和再生性能、分析工厂胺液脱硫系统贫液的杂质组成和来源、对比实验室净化前后的效果,查明胺液脱硫系统脱硫剂再生性能下降的原因。据此对工厂胺液脱硫系统提出相应的操作建议,包括采取胺液净化技术将系统热稳盐含量(w)从2.35%降至0.95%、规范操作以降低Na~+含量等措施,使得胺液脱硫系统在整改后的两个月运行中,贫液中ρ(H_2S)从原来的最高1.68 g/L降至0.66 g/L以下,达到胺液脱硫系统稳定运行的目的。

Cause Analysis and Countermeasures on Performance Degradation of Regenerated Amine Desulfurization System

Two sets of amine regeneration units in SINOPEC Maoming Company were abnormal with 2.0-3.0 g/L of ρ（H₂S）in the lean solution,which was much higher than the designed value of 1.2 g/L. The causes of performance degradation of the regenerated desulfurizer were investigated by examining the absorption and regeneration performance of the fresh desulfurizer on a lab unit,analyzing the composition and sources of impurities in the lean solution from the amine desulfurization system,and comparing the desulfurization effect of lab test. Accordingly,some suggestions for operation of industrial amine desulfurization system are put forward,such as decreasing the mass fraction of heat-stable salt in the system from 2.35% to 0.95% by purification technology and reducing Na⁺ content by standard operation. During two months’ running,ρ（H₂S）in the lean solution is decreased from 1.68 g/L to below 0.66 g/L,and the purpose of stable operation of amine desulfurization system is achieved.