Chinese Journal of Chemical Engineering ›› 2020, Vol. 28 ›› Issue (5): 1277-1284.doi: 10.1016/j.cjche.2019.12.020

• Separation Science and Engineering • Previous Articles     Next Articles

Conceptual design of energy-saving stripping process for industrial sour water

Hengjun Gai, Shuo Chen, Kaiqiang Lin, Xiaowei Zhang, Chun Wang, Meng Xiao, Tingting Huang, Hongbing Song   

  1. College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
  • Received:2019-10-07 Revised:2019-12-18 Online:2020-05-28 Published:2020-07-29
  • Contact: Meng Xiao
  • Supported by:
    We thank the support provided by the National Key R&D Program of China(No. 2017YFB0602804) and the National NaturalScienceFoundation of China (No. 21878164).

Abstract: Sour water contains ammonia, carbon dioxide, and hydrogen sulfides, producing from oil refining, coking, and coal gasification. To reduce the energy consumption in sour water stripping, a novel process is proposed which integrates with the bottom flashing mechanical vapor recompression heat pump (MVRHP) for treating such wastewater. Here, Aspen PlusTM as a powerful set of chemical process simulation software is utilized to investigate the economy and feasibility of the novel process. Comparison of the results of two process simulations, it can be seen that it is possible to reduce the total annual cost by nearly 45% to adopt the novel process, despite the capital investment increase 45% more than the conventional process. Thus, the provided conceptual design will play a guiding role in the industrialization of the process.

Key words: Energy saving, Sour water stripping, Thermal pump, Conceptual design, Coal gasification wastewater