Conceptual design and system analysis coal to ethylene glycol process integrated with efficient utilization of CO2

doi:10.11949/j.issn.0438-1157.20181044

Abstract

Abstract:

In the momentum of reducing CO₂ emission of coal to ethylene glycol process, a novel carbon dioxide utilized coal to ethylene glycol (CUCtEG) process is proposed, simulated, and optimized. The novel process is assisted with coke oven gas to enhance resource and energy efficiencies as well as reduce CO₂ emission by integrating with dry/steam-mixed methane reforming technologies. Based on the rigorous steady-state simulation of the process, key operational parameters of the novel process are investigated and optimized. The optimal feed ratio of coke oven gas to coal and the split ratio of that for steam methane reforming reaction are 0.68 and 0.74. Compared with the traditional process, the CO₂ emission of the new process is reduced by 94.05%, and the exergy efficiency is increased by 15.17%.

Key words: coal to ethylene glycol, coke oven gas, carbon dioxide, optimal design, exergy

摘要：

为减少传统煤制乙二醇过程资源利用效率低和CO₂排放量高等问题，提出了一种集成CO₂高效利用的煤制乙二醇过程，并对其进行了全流程建模及系统分析。与传统过程不同，新过程利用焦炉气来提高其资源利用率和能量效率，集成甲烷干重整与湿重整技术降低CO₂排放。在全流程建模的基础之上，对新工艺的关键操作参数进行了分析与优化。结果表明，焦炉气的最佳进料比和甲烷蒸汽重整反应的分配比为0.68和0.74。与传统过程相比，新工艺的CO₂排放降低了94.05％，同时?效率提高了15.17％。

关键词: 煤制乙二醇, 焦炉气, 二氧化碳, 优化设计, ?

CLC Number:

TQ 536.1

Shun ZHU, Qi GUO, Dawei ZHANG, Qingchun YANG. Conceptual design and system analysis coal to ethylene glycol process integrated with efficient utilization of CO₂[J]. CIESC Journal, 2019, 70(2): 772-779.

朱顺, 郭琦, 张大伟, 杨庆春. 集成CO₂高效利用的煤制乙二醇过程设计与系统分析[J]. 化工学报, 2019, 70(2): 772-779.

Figures/Tables 8

Fig.1 Schematic diagram of CtEG process

Fig.2 Schematic diagram novel CUCtEG process

Fig.3 Simplified flow diagram of CUCtEG process

Fig.4 Effects of COG/coal and f SMR on H2/CO ratio

Fig.5 Effects of COG/coal and f SMR on carbon efficiency

Fig.6 Effect of CH4/CO2 ratio on CH4 conversion

Fig.7 Material balance diagram for CUCtEG process

Fig.8 CO2 emission and carbon efficiency of CtEG and CUCtEG processes

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Conceptual design and system analysis coal to ethylene glycol process integrated with efficient utilization of CO₂

集成CO₂高效利用的煤制乙二醇过程设计与系统分析

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References 31

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