中国煤化工行业开展CO2强化深部咸水开采技术的潜力评价

Evaluation on potential of CO2 enhanced water recovery deployment in China’s coal chemical industry

中国是煤转化的技术引领者,已建、拟建和审批了大量煤转化企业;随之带来了严峻的CO2排放和水资源缺乏的问题。CO2强化深部咸水开采(CO2-EWR)技术是大规模CO2减排和水资源开采的方法,特别适合缺水区域的煤化工行业。煤化工企业工艺排放的高浓度CO2结合CO2-EWR技术可以较低成本实现CO2减排,并部分解决工业缺水的问题。研究首先建立了行业尺度的包括源汇匹配、技术经济评价、CO2排放量评估和封存场地适宜性评价等方法的全流程碳捕集、利用和封存技术经济评估方法(ITEAM-CCUS),然后采用该方法对2018年的煤化工企业排放的高浓度CO2开展全流程CO2-EWR项目的源汇匹配、成本范围及减排潜力进行评价并得到:大部分的源汇组合分布在中国西北、华北及北部等干旱地区;基于煤化工厂2018年的实际产量和100%总产能计算,高浓度CO2年排放量分别是190 Mt和1726 Mt;当全流程CO2-EWR项目的平准化成本低于200元/t CO2时,累计CO2减排量分别为160 Mt/a与1569 Mt/a,地下水产量分别为241 Mt/a与2353 Mt/a。研究结果表明煤化工CO2-EWR技术是中国煤化工行业低碳可持续发展的关键技术,也为中国部署大规模CCUS提供了低成本机会。

As a leading country in coal chemical technology,a huge number of coal chemical factories are at stages of operating,construction and proposal to administrative system in China.This causes huge problems of CO2 emissions and water demand.CO2-enhanced deep saline water recovery(CO2-EWR)technology can provide large-scale CO2 mitigation and additional water recovery,especially in coal rich and water scarcity areas.The combination of CO2 from industrial separation processes in the coal chemical industry and CO2-EWR technology can provide low-cost opportunities to solve the CO2 mitigation–water shortage nexus.The study firstly establishes a model of Integrated Techno-Economic Assessment Method for CO2 Capture,Utilization and Storage(ITEAMCCUS)in industrial scale which includes source-sink matching,techno-economic assessment,CO2 emissions assessment,and storage site suitability evaluation.Then assess high concentrations of CO2 emissions which is captured from China’s coal chemical factories of 2018,source-sink matching,and the range of cost and emissions reduction potential of full chains CO2-EWR projects.The basic evaluation results are that most of the sourcesink couplings distribute in dry areas including Northwest China,North China,northern,etc.Annual high concentrations of CO2 emissions respectively is 190 Mt and 1726 Mt assessing by the actual production in 2018 and the total capacity of coal chemical factories;the annual cumulative CO2 emission reductions are 160 Mt and 1569 Mt with levelized cost less than 200 CNY/t CO2,and the corresponding saline water production are 241 Mt and 2353 Mt,respectively.Therefore,CO2-EWR technology can be essential to low-carbon and sustainable development of the coal chemical industry in China,and may provide low-cost opportunities to spread the largescale deployment of CCUS technologies in China.