纯碱软化-汽提脱氨法处理SE水煤浆气化废水

石油炼制与化工 ›› 2022, Vol. 53 ›› Issue (12): 91-96.

纯碱软化-汽提脱氨法处理SE水煤浆气化废水

陈永勤

中国石化镇海炼化分公司

收稿日期:2022-03-30 修回日期:2022-05-13 出版日期:2022-12-12 发布日期:2022-12-06
通讯作者: 陈永勤 E-mail:chenyq641.zhlh@sinopec.com

TREATMENT OF GASIFICATION WASTEWATER FROM SE COAL WATER SLURRY BY SODIUM CARBONATE SOFTENING-STRIPPING AMMONIA REMOVAL PROCESS

Received:2022-03-30 Revised:2022-05-13 Online:2022-12-12 Published:2022-12-06

摘要/Abstract

摘要： 对纯碱软化-汽提脱氨法预处理SE水煤浆气化废水的工业化运行效果进行分析。结果表明，在控制废水流量为160m³/h，废水pH为10.5～11，沉降槽依次投加NaOH、Na₂CO₃、聚合氯化铝（PAC）和聚丙烯酰胺（PAM），汽提塔维持蒸汽流量为7.5～8.5t/h、压力为0.14～0.16MPa、塔釜温度不大于125℃的条件下，出水硬度可降至174mg/L、氨氮质量浓度降至17mg/L，各项污染物指标优于设计值。

关键词: 气化废水, 高氨氮, 高硬度, 纯碱软化, 汽提脱氨, pH

Abstract: The industrial operation effect of pretreatment of gasification wastewater from SE coal slurry by sodium carbonate softening-stripping ammonia removal process in a refinery was analyzed. The results showed that when the wastewater flow rate was 160 m³/h, pH of the wastewater was 10.5-11，the chemicals addition order of sedimentation tank was NaOH, Na₂CO₃, polymeric aluminium chloride (PAC), polyacrylamide (PAM), the steam flow rate of the stripper was 7.5-8.5 t/h, the pressure was 0.14-0.16 MPa, and the temperature at the column kettle was not more than 125 ℃, the discharge concentration of hardness and ammonia-nitrogen of wastewater could be reduced to 174 mg/L and 17 mg/L respectively, and the pollutant indexes were better than the design values.

Key words: gasification wastewater, high ammonia nitrogen, high hardness, sodium carbonate softening, steam stripping deamination, pH

陈永勤. 纯碱软化-汽提脱氨法处理SE水煤浆气化废水[J]. 石油炼制与化工, 2022, 53(12): 91-96.

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