化工进展 ›› 2021, Vol. 40 ›› Issue (S2): 15-19.DOI: 10.16085/j.issn.1000-6613.2021-1640

• 化工过程与装备 • 上一篇    下一篇

大颗粒尿素造粒尾气冷却洗涤器技术应用进展

张军保1(), 王忠凯2, 刘彪1, 张晓晖3, 刘冠美4   

  1. 1.北京化工大学高新技术研究院,北京 100029
    2.北方华锦联合石化有限公司,辽宁 盘锦 110002
    3.锦西天然气化工有限责任公司,辽宁 葫芦岛 125001
    4.阳煤平原化工有限公司,山东 平原 253100
  • 收稿日期:2021-08-03 修回日期:2021-08-11 出版日期:2021-11-12 发布日期:2021-11-12
  • 通讯作者: 张军保
  • 作者简介:张军保(1963—),男,研究员,研究方向为分离工程。E-mail:zhangjunbao@vip.sina.com

Progress in the application of cooling scrubber technology for large granular urea granulation tail gas

ZHANG Junbao1(), WANG Zhongkai2, LIU Biao1, ZHANG Xiaohui3, LIU Guanmei4   

  1. 1.Beijing University of Chemical Technology Research Institute of High Technology, Beijing 100029, China
    2.North Huajin United Petrochemical Co. , Ltd. , Panjin 110002, Liaoning, China
    3.Jinxi Natural Gas Chemical Co. , Ltd. , Huludao 125001, Liaoning, China
    4.Yangmei Plain Chemical Co. , Ltd. , Pingyuan 253100, Shandong, China
  • Received:2021-08-03 Revised:2021-08-11 Online:2021-11-12 Published:2021-11-12
  • Contact: ZHANG Junbao

摘要:

化肥厂尿素车间造粒工段不可避免地会产生含尿素粉尘的气体,尤其是在大颗粒尿素的造粒过程中会产生温度及尿素粉尘浓度都较高的气体,生产中需要将这些粉尘捕集回收利用,以增加经济效益和避免环境污染。本文指出,根据尿素水溶性好的特点,国内外一般都采用湿法捕集技术,其核心装置就是尿素尾气冷却洗涤器。通过该系统对尿素造粒产生的尾气进行冷却洗涤处理后排放大气,同时回收尿素粉尘。文中简述了尿素尾气冷却洗涤装置发展经历的不同阶段,包括最初的散堆填料塔、塔盘和喷头组合、规整填料和MD塔盘复合结构、气液并流式冷却洗涤器和隔壁塔型气液混流式冷却洗涤器。指出气液并流式冷却洗涤器与传统的逆流吸收塔相比,操作不会产生液泛,气速范围大,处理能力高,排放更加环保化,同等条件下投资降低40%,系统压力降降低50%以上,风机功率降低,节省了操作费用,近些年来已被国内多数厂家采用。

关键词: 尿素尾气, 洗涤冷却, 粉尘回收, 达标排放

Abstract:

In the granulation section of the urea workshop of the chemical fertilizer plant, gas containing urea dust will inevitably be produced, especially in the granulation process of large particles of urea, dust gas with higher temperature and urea dust concentration will be generated. Dust is collected and recycled to increase economic benefits and avoid environmental pollution. According to the good water solubility of urea, wet capture technology is generally adopted at home and abroad, and the core device of the system is the urea exhaust gas cooling scrubber. Through this system, the exhaust gas produced by urea granulation is cooled and washed, and then discharged into the atmosphere, and urea dust is recovered at the same time. With the advancement of technology, the development of urea exhaust gas cooling and scrubbing equipment has gone through different stages. Including the original random packed tower, tray and nozzle combination, structured packing and MD tray composite structure, gas-liquid co-current cooling scrubber, etc. Compared with the traditional countercurrent absorption tower, the gas-liquid co-current cooling scrubber. The operation will not produce flooding, the gas velocity range is large, the processing capacity is high, and the discharge is more environmentally friendly. Compared with the traditional scrubbing device, under the same conditions, the first investment is reduced by 40%, the system pressure drop is reduced by more than 50%, the fan power and air pressure are reduced, and the operation cost is reduced. In recent years, it has been adopted by most domestic manufacturers.

Key words: urea exhaust gas, scrubbing cooling, dust recovery, up-to-standard emission

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