煤制天然气联产化学品工艺路径探讨与分析
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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。
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 technoeconomic 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.
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 technoeconomic 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.
引文
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[11]吴涛.中国煤制乙二醇发展趋势研究[D].北京:中国地质大学,2018.WU Tao. Study on the development trend of ethylene glycol based coal in China[D]. Beijing:China University of Geosciences, 2018.
[12] YANG Qingchun, ZHANG Dawei, ZHOU Huairong, et al. Process simulation, analysis and optimization of a coal to ethylene glycol process[J]. Energy, 2018, 155(15):521-534.
[13] LIU Yang, QIAN Yu, XIAO Honghua, et al. Techno-economic and environmental analysis of coal-based synthetic natural gas process in China[J]. Journal of Cleaner Production, 2017, 30(1):50-56.
[2]刘朝全,姜学峰. 2018年国内外油气行业发展报告[R].北京:石油工业出版社, 2019.LIU Chaoquan, JIANG Xuefeng. Development report of oil and gas industry at home and abroad in 2018[R]. Beijing:Petroleum Industry Press, 2019.
[3]张鸿宇,周丽,张希良.我国现代煤化工产业现状及政策综述[J].现代化工, 2018, 38(5):1-5.ZHANG Hongyu, ZHOU Li, ZHANG Xiliang. Review on status and policy of China's coal chemical industry[J]. Modern Chemical Industry, 2018, 38(5):1-5.
[4]安文忠,田普州,齐凯.中国煤制天然气产业现状、发展机遇与挑战[J].煤化工, 2018,46(3):7-11.AN Wenzhong, TIAN Puzhou, QI Kai. Current situation and opportunities&challenges of coal to SNG industry in China[J]. Coal Chemical Industry, 2018, 46(3):7-11.
[5]阮立军.新形势下煤炭行业发展现代煤化工的思路[J].煤炭加工与综合利用, 2017(4):6-14.RUAN Lijun.Thoughts on the development of modern coal chemical industry in coal industry under new situation[J]. Coal Processing&Comprehensive Utilization, 2017(4):6-14.
[6]倪维斗,陈贞.煤的清洁高效利用是中国低碳经济的关键[J].太原理工大学学报, 2010, 41(5):454-458.NI Weidou, CHEN Zhen. Clean and efficient utilization of coal-key to China's low carbon economy[J]. Journal of Taiyuan University of Technology, 2010, 41(5):454-458.
[7]王倜,刘培,麻林巍,等.我国煤基多联产系统的发展潜力及技术路线研究[J].中国工程科学, 2015, 17(9):75-81.WANG Ti, LIU Pei, MA Linwei, et al. Study on China's developing potential and technical route of coal-based co-production system[J].Engineering Science, 2015, 17(9):75-81.
[8] HE Chang, FENG Xiao, CHU K H. Process modeling and thermodynamic analysis of Lurgi fixed-bed coal gasifier in an SNG plant[J]. Applied Energy, 2013, 111(11):742-757.
[9]蒋子龙,姜博洋,王金鹏,等.国内外甲醇市场分析及展望[J].化学工业, 2017, 35(6):29-34.JIANG Zilong, JIANG Boyang, WANG Jinpeng, et al. Analysis and prospect of methanol market at home and abroad[J]. Chemical Industry, 2017, 35(6):29-34.
[10]刘霞.煤制甲醇过程的低温余热利用与碳减排工艺研究[D].广州:华南理工大学, 2016.LIU Xia. The study on low temperature waste heat utilization and carbon reduction of coal-based methanol process[D]. Guangzhou:South China University of Technology, 2016.
[11]吴涛.中国煤制乙二醇发展趋势研究[D].北京:中国地质大学,2018.WU Tao. Study on the development trend of ethylene glycol based coal in China[D]. Beijing:China University of Geosciences, 2018.
[12] YANG Qingchun, ZHANG Dawei, ZHOU Huairong, et al. Process simulation, analysis and optimization of a coal to ethylene glycol process[J]. Energy, 2018, 155(15):521-534.
[13] LIU Yang, QIAN Yu, XIAO Honghua, et al. Techno-economic and environmental analysis of coal-based synthetic natural gas process in China[J]. Journal of Cleaner Production, 2017, 30(1):50-56.