电渗析脱除热稳定盐技术在天然气净化厂的应用

Application of heat stable salts removal technology by electrodialysis in natural gas purification plant

摘要: 采用电渗析技术对普光天然气净化厂730 m³ N-甲基二乙醇胺(MDEA)溶液中热稳定盐(HSS)的脱除进行应用分析。结果表明：在200对均相膜片、电压100 V的操作条件下，MDEA溶液中热稳定盐的质量分数由3%降至0.5%；Cl^-质量浓度由1 300 mg/L降至200 mg/L；Na⁺质量浓度由4 200 mg/L降至700 mg/L；MDEA质量分数由41.47%降至40.42%。此外，电渗析脱盐技术具有高效、环保、无需酸液和碱液再生等优点，为MDEA溶液的净化提供了新的技术路线。

Abstract: The application of electrodialysis technology in removing the heat stable salts (HSS) in 730 m³ N-methyl diethanolamine (MDEA) solution of Puguang Natural Gas Purification Plant were analyzed. The results showed that in 200 pairs of homogeneous membrane and 100 V voltage operating conditions, the HSS mass fraction in the MDEA solution reduced from 3% to 0.5%, Cl^- mass concentration reduced from 1 300 mg/L to 200 mg/L, Na⁺ mass concentration reduced from 4 200 mg/L to 700 mg/L, MDEA concentration reduced from 41.47% to 40.42%. In addition, the electrodialysis desalination technology has the advantages of high efficiency, environmental protection, and no acid and alkali regeneration, which offers a new technical route for the purification of MDEA solution.