Progress in key unit technologies and low-carbon integrated processes of coal to ethylene glycol process

doi:10.16085/j.issn.1000-6613.2021-2147

Abstract

Abstract:

The consistently high dependency on importing ethylene glycol and the resource characteristics of rich coal and less oil of China make coal-to-ethylene glycol technology have better cost and raw material advantages and develop rapidly. The present situation and development trend of coal-to-ethylene glycol technology at home and abroad are summarized, and the technical characteristics, flowsheet and technological progress of key unit technologies such as coal gasification, dimethyl oxalate synthesis and ethylene glycol synthesis and refining units are emphatically introduced. The influence of the relevant units on the technical and economic performance of the whole coal-to-ethylene glycol system is analyzed. Aiming at the problems of high energy consumption, low mass and energy efficiency and large CO₂ emission in the existing technology of coal-to-ethylene glycol, it focuses on the development of the novel process for the production of ethylene glycol from coal and hydrogen-rich resources that integrates the efficient utilization of CO₂, including the novel processes that couple with coke oven gas, shale gas and green hydrogen resources. Taking coke oven gas as an example, compared with the traditional process, the novel processes integrating different reforming technologies can improve carbon efficiency and exergy efficiency by 23.35%—39.17% and 4.25%—10.12%, reduce production cost by 8.73%—19.88%, and increase internal rate of return by 3.6%—9.6%, respectively. Therefore, the coal to ethylene glycol process integrated with the effective utilization of coke oven gas, shale gas and green hydrogen is the promising direction for the efficient, economic, and clean development of this industry.

Key words: gasification, syngas, ethylene glycol, system integration, optimal design

摘要：

我国乙二醇对外依存度居高不下，而富煤少油的资源特性使得我国煤制乙二醇技术具有较好的成本与原料优势，发展迅速。本文综述了国内外煤制乙二醇技术的技术现状和发展趋势，重点介绍了煤气化、草酸二甲酯合成和乙二醇合成与精制等关键单元技术的技术特征、工艺流程和技术进展，并分析了相关单元对整个煤制乙二醇系统技术经济性能的影响。针对现有煤制乙二醇技术存在能耗高、质能效率低和CO₂排放大的问题，着重讨论了集成CO₂高效利用的煤与富氢资源联供制乙二醇集成工艺的进展，包括耦合焦炉气、页岩气和绿氢等资源的新工艺等。以焦炉气为例，集成不同重整技术的新工艺使得传统工艺的碳效率和?效率分别提升了23.35%~39.17%和4.25%~10.12%，生产成本降低了8.73%~19.88%，内部收益率提高了3.6%~9.6%。因此，集成富氢资源与CO₂高效利用的煤制乙二醇创新工艺是该行业向高效-经济-清洁可持续发展的重要方向。

关键词: 气化, 合成气, 乙二醇, 系统集成, 优化设计

CLC Number:

TQ536.1

CHU Genyun, FAN Yingjie, ZHANG Dawei, GAO Minglin, MEI Shumei, YANG Qingchun. Progress in key unit technologies and low-carbon integrated processes of coal to ethylene glycol process[J]. Chemical Industry and Engineering Progress, 2022, 41(3): 1654-1666.

储根云, 范英杰, 张大伟, 高明林, 梅树美, 杨庆春. 煤制乙二醇关键单元技术与低碳集成工艺的研究进展[J]. 化工进展, 2022, 41(3): 1654-1666.

Figures/Tables 13

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气化技术	Texaco	Shell	GSP
反应床类型	气流床	气流床	气流床
气化温度/℃	1350~1400	1400~1600	1400~1600
气化压力 /MPa	2.6~8.5	2~4	2.5~4.0
出口温度/℃	约210	约170	约220
煤种	烟煤、次烟煤等	褐煤、烟煤等	褐煤、烟煤等
进料方式	60%~65%水煤浆	150~200目干煤粉	250~500目干煤粉
湿度/%	<8	烟煤<2；褐煤<8	烟煤<2；褐煤<8
灰熔点/℃	<1300	<1500	<1500
灰分/%	<13	1~20	1~20
单炉投煤量 /t·d^-1	2000	2800	720
气化剂	纯氧	纯氧+水蒸气	纯氧+水蒸气
有效气体积分数/%	77.5	96.6	88.8
国产化水平	基本国产化	关键设备需引进	关键设备需引进
投资	低	高	较高

气化技术	Texaco	Shell	GSP
反应床类型	气流床	气流床	气流床
气化温度/℃	1350~1400	1400~1600	1400~1600
气化压力 /MPa	2.6~8.5	2~4	2.5~4.0
出口温度/℃	约210	约170	约220
煤种	烟煤、次烟煤等	褐煤、烟煤等	褐煤、烟煤等
进料方式	60%~65%水煤浆	150~200目干煤粉	250~500目干煤粉
湿度/%	<8	烟煤<2；褐煤<8	烟煤<2；褐煤<8
灰熔点/℃	<1300	<1500	<1500
灰分/%	<13	1~20	1~20
单炉投煤量 /t·d^-1	2000	2800	720
气化剂	纯氧	纯氧+水蒸气	纯氧+水蒸气
有效气体积分数/%	77.5	96.6	88.8
国产化水平	基本国产化	关键设备需引进	关键设备需引进
投资	低	高	较高

工艺	煤/t·t EG^-1	焦炉煤气/kmol·t^-1	电/kW·t^-1	碳效率/%	?效率/%	总投资/CNY·t^-1·a^-1	总生产成本/CNY·t^-1	内部收益率/%
CtEG	3.17	—	999.07	21.23	30.68	16142	5142	9.25
CtEG-SMR	1.18	40.20	765.07	44.58	34.93	13591	4693	12.85
CtEG-DMR	0.90	41.51	736.40	53.56	38.75	14147	4600	13.01
CtEG-S&DMR	0.69	48.55	655.33	60.44	39.46	12604	4377	16.45
CtEG-TR	0.87	48.88	678.13	55.51	40.80	12114	4120	18.85

工艺	煤/t·t EG^-1	焦炉煤气/kmol·t^-1	电/kW·t^-1	碳效率/%	?效率/%	总投资/CNY·t^-1·a^-1	总生产成本/CNY·t^-1	内部收益率/%
CtEG	3.17	—	999.07	21.23	30.68	16142	5142	9.25
CtEG-SMR	1.18	40.20	765.07	44.58	34.93	13591	4693	12.85
CtEG-DMR	0.90	41.51	736.40	53.56	38.75	14147	4600	13.01
CtEG-S&DMR	0.69	48.55	655.33	60.44	39.46	12604	4377	16.45
CtEG-TR	0.87	48.88	678.13	55.51	40.80	12114	4120	18.85

项目	CtEG	D-SCtEG	S-SCtEG	D+S-SCtEG
原煤/t·t EG^-1	3.17	0.57	0.57	0.44
页岩气/kmol?h^-1·t EG^-1	0	1.58	1.64	2.14
总碳输入/kmol·h^-1	5699.48	2034.64	2068.02	2336.36
总?输入/MW	661.56	419.53	395.34	457.75
乙二醇/Mt·a^-1	0.3	0.3	0.3	0.3
碳元素利用效率/%	21.23	59.47	58.51	59.33
?效率/%	30.68	48.31	55.98	50.94
总投资/CNY·t^-1·a^-1	16142	15360	13280	13530
总生产成本/CNY·t^-1	5142	4565	4425	4636
内部收益率/%	9.25	13.64	18.65	16.43
直接CO₂排放/t·t EG^-1	2.58	0	0.57	0.06