煤制天然气联产化学品工艺路径探讨与分析

doi:10.16085/j.issn.1000-6613.2018-2308

摘要/Abstract

摘要：

煤制天然气示范项目存在产品生产模式单一、煤炭转化增值偏低等问题，在天然气面临价格下调的背景下，单一的产品结构已经成为制约煤制天然气项目健康发展的瓶颈问题。本文从煤基多联产的角度出发，探讨和分析煤制天然气工厂多联产化学品生产路径，旨在实现终端产品多样化和高值化，提高企业经济效益。本文通过对国内主要联产化学品需求和关键单元技术分析的基础上，结合现有煤制天然气工艺技术特点，提出了煤制天然气厂联产甲醇和联产甲醇、乙二醇两种联产方案，并对两种方案进行概念设计以及物料衡算。通过对两种联产方案进行技术经济分析发现，联产甲醇、乙二醇方案在内部收益率和投资回收期关键经济指标方面具有明显的优势。因此，在煤制天然气项目的基础上建立联产甲醇、乙二醇装置是解决现有煤制天然气项目瓶颈问题最为适合的路径。

关键词: 煤制天然气, 煤基多联产, 甲醇, 乙二醇, 技术经济分析

Abstract:

Coal to synthetic natural gas (SNG) demonstration projects exist serious problems of monotonous production model and low value increase of coal. Under the circumstance of the decline in natural gas price, the single product structure has become to be the bottle-neck of healthy development of coal-to-SNG industry. In this paper, the coal-based co-production process of synthetic natural gas and chemicals is discussed and analyzed systematically. The coal-based co-production system is aiming to diversify and improve the value of terminal products by integration a variety of coal conversion technology. Based on the investigation of the domestic demand for the co-production chemicals and the key unit process, two schemes that co-production methanol scheme and co-production methanol and ethylene glycol scheme are proposed. The conceptual processes are designed and mass balance are calculated. On this basis, techno-economic performances are systematically analyzed. The results show that the co-production methanol and ethylene glycol scheme has obvious advantages in key techno-economic indicators, such as in internal rate of return and economic indicators of payback period. In summary, the co-production methanol and ethylene glycol scheme is the best program for coal-to-SNG co-production chemicals process to solve the bottleneck problem of the existing coal-to-SNG projects.

Key words: coal-to-SNG, co-production system, methanol, ethylene glycol, techno-economic analysis

中图分类号:

TQ 536

刘永健, 吴秀章, 王鹤鸣, 夏俊兵, 王波. 煤制天然气联产化学品工艺路径探讨与分析[J]. 化工进展, 2019, 38(07): 3111-3116.

Yongjian LIU, Xiuzhang WU, Heming WANG, Junbing XIA, Bo WANG. Investigation and analysis of coal-based co-production process of synthetic natural gas and chemicals[J]. Chemical Industry and Engineering Progress, 2019, 38(07): 3111-3116.

图/表 8

参考文献 13

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组分	体积分数/%	组分	体积分数/%
H₂	38~41	CO₂	28~32
CO	14~23	C_nH_m	0.5~1.0
CH₄	10~12	N₂	~1.0

组分	体积分数/%	组分	体积分数/%
H₂	38~41	CO₂	28~32
CO	14~23	C_nH_m	0.5~1.0
CH₄	10~12	N₂	~1.0

项目	原装置	联产甲醇	联产甲醇、乙二醇
消耗
原料煤/10⁴t·a^-1	561.88	561.88	561.88
燃料煤/10⁴t·a^-1	290.63	290.63	297.02
新鲜水/10⁴t·a^-1	1040	1081	1560
外购电力/10⁸kW·h·a^-1	2.08	2.29	9.38
自产电力/10⁸kW·h·a^-1	13.60	13.60	12.40
产出
天然气/10⁸m³·a^-1	13.33	8.90	5.96
优等品乙二醇/10⁴t·a^-1	—	—	38.2
合格品乙二醇/10⁴t·a^-1	—	—	1.8
甲醇/10⁴t·a^-1	—	80	80
2#煤焦油/10⁴t·a^-1	8.787	8.787	8.787
1#煤焦油/10⁴t·a^-1	5.627	5.627	5.627
0#煤焦油/10⁴t·a^-1	3.427	3.427	3.427
粗酚/10⁴t·a^-1	4.393	4.393	4.393
硫磺/10⁴t·a^-1	2.573	2.573	2.573
硫铵/10⁴t·a^-1	8.769	8.769	8.769
碳酸二甲酯/t·a^-1	—	—	17866
混合醇酯/t·a^-1	—	—	13713
轻质醇/t·a^-1	—	—	17915
重质醇/t·a^-1	—	—	8061
DMO重组分/t·a^-1	—	—	7112

项目	原装置	联产甲醇	联产甲醇、乙二醇
消耗
原料煤/10⁴t·a^-1	561.88	561.88	561.88
燃料煤/10⁴t·a^-1	290.63	290.63	297.02
新鲜水/10⁴t·a^-1	1040	1081	1560
外购电力/10⁸kW·h·a^-1	2.08	2.29	9.38
自产电力/10⁸kW·h·a^-1	13.60	13.60	12.40
产出
天然气/10⁸m³·a^-1	13.33	8.90	5.96
优等品乙二醇/10⁴t·a^-1	—	—	38.2
合格品乙二醇/10⁴t·a^-1	—	—	1.8
甲醇/10⁴t·a^-1	—	80	80
2#煤焦油/10⁴t·a^-1	8.787	8.787	8.787
1#煤焦油/10⁴t·a^-1	5.627	5.627	5.627
0#煤焦油/10⁴t·a^-1	3.427	3.427	3.427
粗酚/10⁴t·a^-1	4.393	4.393	4.393
硫磺/10⁴t·a^-1	2.573	2.573	2.573
硫铵/10⁴t·a^-1	8.769	8.769	8.769
碳酸二甲酯/t·a^-1	—	—	17866
混合醇酯/t·a^-1	—	—	13713
轻质醇/t·a^-1	—	—	17915
重质醇/t·a^-1	—	—	8061
DMO重组分/t·a^-1	—	—	7112

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