化工进展 ›› 2019, Vol. 38 ›› Issue (05): 2506-2514.DOI: 10.16085/j.issn.1000-6613.2018-1673

• 应用技术 • 上一篇    下一篇

煤制天然气酚氨回收工艺分析与探讨

刘永健1(),王波1,夏俊兵1,陈博坤2,杨思宇2()   

  1. 1. 中新能化科技有限公司,北京 100084
    2. 华南理工大学化学与化工学院,广东 广州 510640
  • 收稿日期:2018-08-16 修回日期:2018-12-04 出版日期:2019-05-05 发布日期:2019-05-05
  • 通讯作者: 杨思宇
  • 作者简介:<named-content content-type="corresp-name">刘永健</named-content>(1980—),男,博士,主要研究方向为化工过程系统工程。E-mail:<email>liuyongjian@zx-ec.com.cn</email>。|杨思宇,博士,副研究员,主要研究方向为化工过程系统工程。E-mail:<email>cesyyang@scut.edu.cn</email>。
  • 基金资助:
    国家自然科学基金重点项目(21736004)

Analysis on phenol and ammonia recovery process applied in coal-to-SNG

Yongjian LIU1(),Bo WANG1,Junbing XIA1,Bokun CHEN2,Siyu YANG2()   

  1. 1. Zhongxin Energy & Chemical Corporation, Ltd., Beijing 100084, China
    2. School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China
  • Received:2018-08-16 Revised:2018-12-04 Online:2019-05-05 Published:2019-05-05
  • Contact: Siyu YANG

摘要:

废水处理问题是限制煤制天然气发展的主要问题,其中酚氨回收单元是影响整个废水处理流程平稳运行的关键因素。本文主要介绍了3种已工业化的酚氨回收工艺,通过分析酚氨回收工艺,发现酚氨回收单元主要存在以下几个共性问题:①总氨脱除效率低,氨产品中酚含量高;②萃取脱酚效率低。拟通过单元优化和工艺改造两方面对上述问题进行解决,因此对酚氨回收工艺提出了相应的优化方案:①增加脱氨塔塔底再沸器的加热负荷,在脱氨单元加入足量或过量的稀碱液,增加脱氨塔塔板与塔顶之间的距离以及在氨精制单元降低第三级分凝罐的操作温度和增设碱洗罐;②寻求高效的萃取剂,在萃取塔之前增设CO2吸收塔。研究表明,上述优化方案有效地提高了总氨脱除率,降低了氨产品中酚含量,并提高了萃取剂的脱酚效率。

关键词: 煤制天然气, 酚氨回收, 单元优化, 工艺改造

Abstract:

Coal gasification wastewater treatment is the key problem restricting the development of coal-to-SNG, in which phenol and ammonia recovery process is a significant treatment unit that affects the whole wastewater treatment system stable operation. In this paper, three industrial phenol and ammonia recovery processes were introduced. Through the analysis of the phenol ammonia recovery process, it was found that the phenol ammonia recovery unit mainly had the following common problems: ① Low total ammonia removal efficiency, high concentrated phenol in ammonia products, and ② Low efficiency of phenol extraction removal. This paper intended to solve the above problems through unit optimization and process modification, and thus the corresponding optimization scheme for phenol ammonia recovery process was proposed. ① Increasing the reboiler heat duty of wastewater; adding enough or excessive alkali liquor in deamination unit; increasing the distance of 1st plate and the top of the tower; reducing the operating temperature of 3rd partial condenser; and establishing alkali washing tank. ② Develop high efficient phenol extractant and adding CO2 absorption device. It was shown that the above optimization scheme effectively improved the total ammonia removal rate, reduced the phenol content in the ammonia product, and improved the dephenolization efficiency of the extractant.

Key words: coal-to-SNG, phenol and ammonia recovery process, unit optimization, process modification

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