针对煤气化废水预处理脱酸脱氨段存在的处理能力不足、效率低下等问题,提出了改进的方案.通过提高塔设计压力和优化工艺流程,出水中残留的NH3质量浓度保持在200 mg/L以下,残留的H2S质量浓度低于50mg/L,完全满足了生化段的工艺要求,大大提高了生化段的实际处理能力.改造后,年副产液氨1.8万t左右,经济效益可观.%The bottleneck of the coal gasification wastewater pretreatment process was analyzed, and an improved process for sour gas and ammonia stripping was proposed to evaluate the performance of ammonia and sour gas removal. With the developed design, the residual concentration of ammonia, CO2, and H2S were reduced to less than 200 mg/L, 200 mg/L and 50 mg/L, respectively. This made biochemical treatment easier. From the debottlenecked units, 18 000 tons of liquid ammonia was produced as byproduct, and considerable economic benefits were gained. Successful experience can be shared from the improvement of the pretreatment process by many factories with similar units, which pave a sound way for wider application of the gasification technology.
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