Efficient Utilization of CO₂ in a Coal to Ethylene Glycol Process Integrated with Dry/Steam-Mixed Reforming: Conceptual Design and Technoeconomic Analysis
2019
Yang, Qingchun | Liu, Xing | Zhu, Shun | Huang, Weiqing | Zhang, Dawei
In the momentum of reducing the CO₂ emission of coal to ethylene glycol (CtEG) process, a novel carbon dioxide utilized coal to ethylene glycol (CUCtEG) process is proposed, simulated, and optimized to find the optimal way for simultaneous reduction and utilization of CO₂ emissions of conventional coal to ethylene glycol process. The novel process is integrated with coke oven gas and dry/steam-mixed methane reforming technologies to enhance resource and energy efficiencies as well as reduce CO₂ emission. On the basis of the rigorous steady-state simulation of the process, the key operational parameters of the proposed process are investigated and optimized. A detailed technoeconomic analysis is conducted to manifest the advantages of the proposed process by comparison with a conventional process. The results show that the optimal feed ratio of coke oven gas to coal is 0.68, and the split ratio of CH₄ for steam methane reforming reaction is suggested to be 0.74. Compared with the conventional coal to ethylene glycol process, the direct CO₂ emission of the proposed process is significantly reduced by 94.05%, and the carbon utilization efficiency and exergy efficiency are greatly increased by 36.4% and 15.17%. Moreover, the proposed process has a better economic performance and stronger competitiveness since it can save the production cost by 9.72% and improve the internal rate of return by 6.92%. Thus, the proposed process provides a promising way to efficient utilization of CO₂ and improve the technoeconomic performance of coal to ethylene glycol industry.
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