Development and system assessment of a coal-to-ethylene glycol process coupled with SOEC

doi:10.16085/j.issn.1000-6613.2020-2341

Abstract

Abstract:

Traditional coal-to-ethylene glycol process is criticized by the problems of high CO₂ emissions and low resource utilization efficiency. To address these issues, this paper proposed a novel coal-to-ethylene glycol process coupled with solid oxide electrolytic cells (SO-CtEG). Since the novel process is integrated with the solid oxide electrolytic cells for hydrogen production technology, the water gas shift and air separation units are avoided. In addition, the processing scale of the coal gasification and acid gas removal units is also effectively reduced. According to the modeling and simulation results of the whole SO-CtEG process, techno-economic analysis and sensitivity analysis were conducted in detail. The results show that the carbon utilization efficiency and exergy efficiency of the novel SO-CtEG process are 2.16 times and 1.48 times of the traditional coal-to-ethylene glycol process, respectively. Moreover, compared with the traditional coal-to-ethylene glycol process, the total capital investment and total production cost of the novel SO-CtEG process are reduced by 23.64% and 17.14%, respectively, as well as the internal rate of return is increased by 8.85%. Since the novel process can utilize the energy of wind and light, reduces the carbon emissions of traditional coal-to-ethylene glycol process, and has better technical, economic and environmental performance, it is a promising direction for the coal-to-ethylene glycol industry in the future.

Key words: coal to ethylene glycol, solid oxide electrolytic cells (SOEC), carbon reduction, simulation, techno-economic analysis

摘要：

针对传统煤制乙二醇过程CO₂排放高和资源利用率低等问题，本文提出了一种耦合固体氧化物电解池（SOEC）的煤制乙二醇新工艺（SO-CtEG）。新工艺通过集成固体氧化物电解池制氢技术，避免了水煤气变换单元和空分单元，也有效降低了煤气化和酸性气体脱除单元的处理规模。在全流程建模与模拟的基础之上，进行了详细的技术经济分析与灵敏度分析。结果表明，SO-CtEG新工艺的碳元素利用效率和?效率分别是传统煤制乙二醇项目的2.16倍和1.48倍。与传统煤制乙二醇过程相比，SO-CtEG新工艺总投资费用降低23.64%、生产成本节约17.14 %，内部收益率提高8.85%。因此，新工艺不但可以提高风光消纳能力和减少传统煤制乙二醇的碳排放，还具有更佳的技术经济环境性能，是未来煤制乙二醇行业具有良好发展前景的工艺路线之一。

关键词: 煤制乙二醇, 固体氧化物电解池, 碳减排, 模拟, 技术经济分析

CLC Number:

TQ536.1

YANG Qingchun, YANG Qing, ZHANG Jinliang, GAO Minglin, MEI Shumei, ZHANG Dawei. Development and system assessment of a coal-to-ethylene glycol process coupled with SOEC[J]. Chemical Industry and Engineering Progress, 2021, 40(11): 6061-6070.

杨庆春, 杨庆, 张金亮, 高明林, 梅树美, 张大伟. 耦合SOEC的煤制乙二醇新工艺开发与系统评价[J]. 化工进展, 2021, 40(11): 6061-6070.

Figures/Tables 11

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参数	取值^［12］	参数	取值^［12］
操作温度/K	1073	电池作用面积A/m²	0.04
操作压力/MPa	0.1	电池总数N_cell	500
阴极入口气体组分（摩尔分数）	H₂O 90%，H₂ 10%	孔隙平均半径D_por/m	0.5×10^-6
蒸汽利用因子	85%	孔隙率/%	0.3
阳极内部气体O₂/N₂摩尔比	0.21/0.79	弯曲度	6
阳极活化能E_act，a/J·mol^-1	1.2×10⁵	阳极电极厚度δ_a/m	17.5×10^-6
阴极活化能E_act，c/J·mol^-1	1.0×10⁵	阴极电极厚度δ_c/m	12.5×10^-6
阳极指前因子γ_a	2.051×10⁸	电解质层厚度δ_e/m	12.5×10^-6
阴极指前因子γ_c	1.344×10¹⁰

参数	取值^［12］	参数	取值^［12］
操作温度/K	1073	电池作用面积A/m²	0.04
操作压力/MPa	0.1	电池总数N_cell	500
阴极入口气体组分（摩尔分数）	H₂O 90%，H₂ 10%	孔隙平均半径D_por/m	0.5×10^-6
蒸汽利用因子	85%	孔隙率/%	0.3
阳极内部气体O₂/N₂摩尔比	0.21/0.79	弯曲度	6
阳极活化能E_act，a/J·mol^-1	1.2×10⁵	阳极电极厚度δ_a/m	17.5×10^-6
阴极活化能E_act，c/J·mol^-1	1.0×10⁵	阴极电极厚度δ_c/m	12.5×10^-6
阳极指前因子γ_a	2.051×10⁸	电解质层厚度δ_e/m	12.5×10^-6
阴极指前因子γ_c	1.344×10¹⁰

项目	来源	CtEG	SO-CtEG
输入?/MW	原煤	1111.8	514.1
	公用工程	211.2	377.7
	总输入	1323.0	891.8
输出?/MW	乙二醇	405.9	405.9
?效率/%		30.68	45.50

项目	来源	CtEG	SO-CtEG
输入?/MW	原煤	1111.8	514.1
	公用工程	211.2	377.7
	总输入	1323.0	891.8
输出?/MW	乙二醇	405.9	405.9
?效率/%		30.68	45.50

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