SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2023, Vol. 58 ›› Issue (6): 341-354.DOI: 10.1016/j.cjche.2022.10.012

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Energy, exergy, economic and environmental comprehensive analysis and multi-objective optimization of a sustainable zero liquid discharge integrated process for fixed-bed coal gasification wastewater

Yanli Zhang1, Zhengkun Hou1, Dong Yao1, Xiaomin Qiu1, Hongru Zhang1, Peizhe Cui1, Yinglong Wang1, Jun Gao2, Zhaoyou Zhu1, Limei Zhong1   

  1. 1. College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China;
    2. College of Chemical and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, China
  • Received:2022-07-22 Revised:2022-09-30 Online:2023-08-31 Published:2023-06-28
  • Contact: Peizhe Cui,E-mail:cpzmagic@qust.edu.cn;Yinglong Wang,E-mail:wangyinglong@qust.edu.cn
  • Supported by:
    This work is supported by the National Natural Science Foundation of China (22078166, 22178188).

Energy, exergy, economic and environmental comprehensive analysis and multi-objective optimization of a sustainable zero liquid discharge integrated process for fixed-bed coal gasification wastewater

Yanli Zhang1, Zhengkun Hou1, Dong Yao1, Xiaomin Qiu1, Hongru Zhang1, Peizhe Cui1, Yinglong Wang1, Jun Gao2, Zhaoyou Zhu1, Limei Zhong1   

  1. 1. College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China;
    2. College of Chemical and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, China
  • 通讯作者: Peizhe Cui,E-mail:cpzmagic@qust.edu.cn;Yinglong Wang,E-mail:wangyinglong@qust.edu.cn
  • 基金资助:
    This work is supported by the National Natural Science Foundation of China (22078166, 22178188).

Abstract: For a long time, China's regional water resource imbalance has restricted the development of coal chemical industry, and it is imperative to achieve zero liquid discharge (ZLD). Therefore, the game relationship between technical indicators, costs and emissions in ZLD process of fixed-bed coal gasification wastewater treatment process should be explored in detail. According to the accurate model, the simulation for ZLD of fixed-bed coal gasification wastewater treatment process is established, and this process is assessed from the perspective of thermodynamics, economy, and environment. The total energy consumption of ZLD process before optimization is 4.032×108 W. The results of exergy analysis show exergy destruction of ZLD process is 94.55%. For economic and environmental results, the total annual cost is 1.892×107 USD·a-1 and the total environmental impact is 4.782×10-8. The total energy consumption of the optimal six-step ZLD process based on multi-objective optimization is 4.028×108 W. The CO2 content in the treated wastewater is 0.1%. This study will have an important role in promoting the establishment of the ZLD process for coal chemistry industry.

Key words: Waste water, Case study, Energy, Exergy, Economy, Environment

摘要: For a long time, China's regional water resource imbalance has restricted the development of coal chemical industry, and it is imperative to achieve zero liquid discharge (ZLD). Therefore, the game relationship between technical indicators, costs and emissions in ZLD process of fixed-bed coal gasification wastewater treatment process should be explored in detail. According to the accurate model, the simulation for ZLD of fixed-bed coal gasification wastewater treatment process is established, and this process is assessed from the perspective of thermodynamics, economy, and environment. The total energy consumption of ZLD process before optimization is 4.032×108 W. The results of exergy analysis show exergy destruction of ZLD process is 94.55%. For economic and environmental results, the total annual cost is 1.892×107 USD·a-1 and the total environmental impact is 4.782×10-8. The total energy consumption of the optimal six-step ZLD process based on multi-objective optimization is 4.028×108 W. The CO2 content in the treated wastewater is 0.1%. This study will have an important role in promoting the establishment of the ZLD process for coal chemistry industry.

关键词: Waste water, Case study, Energy, Exergy, Economy, Environment