煤气化高浓酚氨废水处理技术研究进展

doi:10.16085/j.issn.1000-6613.2016.06.030

化工进展 ›› 2016, Vol. 35 ›› Issue (06): 1884-1893.DOI: 10.16085/j.issn.1000-6613.2016.06.030

煤气化高浓酚氨废水处理技术研究进展

钱宇, 杨思宇, 马东辉, 崔培哲

华南理工大学化工学院, 广东广州 510640

收稿日期:2015-12-30 修回日期:2016-02-17 出版日期:2016-06-05 发布日期:2016-06-05
通讯作者: 钱宇 (1957-),男,博士,教授,主要从事过程系统工程方向的研究。E-mail:ceyuqian@scut.edu.cn。
作者简介:钱宇 (1957-),男,博士,教授,主要从事过程系统工程方向的研究。E-mail:ceyuqian@scut.edu.cn。
基金资助:
国家自然科学基金重点项目(21136003)。

Research advances in treatment of coal gasification wastewater with high phenol and ammonia

QIAN Yu, YANG Siyu, MA Donghui, CUI Peizhe

School of Chemical Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China

Received:2015-12-30 Revised:2016-02-17 Online:2016-06-05 Published:2016-06-05

摘要/Abstract

摘要： 煤化工废水中以鲁奇炉和BGL炉为代表的固定床气化洗气废水氨氮和酸性气含量高,且含有高浓度生物毒性的酚类物质,COD高达20000~50000mg/L,形成煤化工废水处理的技术瓶颈问题。本文首先对国内外不同技术进行分析对比,阐述各酚氨处理技术优缺点和工业实施状况。分析表明脱酸脱氨再萃取脱酚技术效果较好,该工艺采用单塔脱酸侧线脱氨将废水pH调至中性利于萃取脱酚,采用新型萃取剂,提高多元酚的分配系数,总酚萃取回收率可达93%。文中详细介绍该工艺中关键装置主要技术参数,如塔的操作温度和压力、精馏塔内回流比、进料位置、萃取塔内相比、萃取级数等。最后介绍了该工艺在哈尔滨煤化工公司煤气化项目的废水处理实例,废水处理量为5000t/d。新流程的处理效果和运行成本具有明显优势。该工艺目前又在中煤能源集团有限公司鄂尔多斯能源化工公司图克化肥项目的煤气化废水处理中获得成功应用。

关键词: 煤气化废水, 酚氨回收, 萃取反萃, 甲基异丁基甲酮, 工艺优化

Abstract: Lurqi and BGL coal gasification requires for much water to wash crude gas. The water is polluted by phenol,ammonia and sour gas with COD up to 20000—50000 mg/L. Removal of these pollutants to acceptable levels for biological treatment is the bottleneck in the water treatment process. This paper analyzes the different treatment processes in terms of their advantages and disadvantages as well as industrial status. The analysis shows that the process of ammonia and acidic gas stripping followed by phenol solvent extraction is better than others in industrial implementation. The ammonia is removed in the first stripping tower,decreasing pH of the wastewater. Phenol extraction is improved in acidic condition. In addition,MIBK is used as the solvent with higher distribution coefficient. The recovery of phenol increases to 93％. In this paper,this treatment process is described in detail,followed by brief explanation of key parameters,such as operating temperature and pressure,reflux ratio,feed position,liquid-liquid extraction phase equilibrium and number of extraction stage. Illustration case of this treatment process is the phenol water treatment unit in coal gasification process of China Coal Longhua Harbin Coal Chemical Co.,Ltd. It has been in successful operation for 5 years with daily processing capacity of 5000t wastewater. Comparison with the conventional treatment the process indicates the advantages in treatment performance and operating cost. This treatment process was also installed and successfully ran in coal to fertilizer process by China Coal Ordos Energy Chemical Co.,Ltd.

Key words: coal-gasification wastewater, removal of phenols and ammonia, extraction, methyl isobutyl ketone, process optimization

中图分类号:

X703

钱宇, 杨思宇, 马东辉, 崔培哲 . 煤气化高浓酚氨废水处理技术研究进展[J]. 化工进展, 2016, 35(06): 1884-1893.

QIAN Yu, YANG Siyu, MA Donghui, CUI Peizhe. Research advances in treatment of coal gasification wastewater with high phenol and ammonia[J]. Chemical Industry and Engineering Progree, 2016, 35(06): 1884-1893.

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煤气化高浓酚氨废水处理技术研究进展

Research advances in treatment of coal gasification wastewater with high phenol and ammonia

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