蒙古国SNG项目全流程CCUS预可行性研究

Pre-feasibility Study of Full-chain CCUS in Mongolia Synthesis Gas Project

蒙古国Baganuur煤矿附近拟建设煤制天然气项目(synthetic natural gas,SNG),为了促进煤转化项目的低碳可持续发展,拟开展SNG项目全流程碳捕集,利用和封存(carbon capture,utilization and storage,CCUS)的预可行性研究。针对蒙古国的SNG项目特点和地质条件,采用预可行性研究框架完成了咸水层封存场地的评价与筛选、场地性能评估、全流程CCUS项目技术设计、技术经济评价等研究内容。初步的场地适宜性评估结果显示:Nyalga盆地具有大量的高适宜的CO_(2)-EWR封存场地和充足的封存容量,目标封存场地的储盖层性能良好。全流程CCUS项目的设计流程为工艺过程分离的高浓度CO_(2)直接压缩,经管道运输至临近的咸水层场地,设定CO_(2)总捕集量的90%用于强化深部咸水开采(CO_(2)enhanced the recovery of water,CO_(2)-EWR),10%出售给蒙古国石油企业开展提高原油采收率(CO_(2)enhanced the recovery of oil,CO_(2)-EOR)研究示范或其他用途。经过评估,20年项目周期的全流程CCUS项目的综合平准化成本为18.8USD/t CO_(2),年减排规模为5Mt CO_(2),年增采深部咸水5.13Mt。研究为蒙古国内开展CCUS技术提供参考,同时也为一带一路国家低碳、可持续地利用化石能源并发展工业提供参考。

A coal-based synthesis natural gas(SNG)project was planned to set up near the Baganuur coal mine in Mongolia.To mitigate carbon dioxide(CO_(2))emissions and promote the sustainable development of coal conversion projects,a pre-feasibility study of full-chain carbon dioxide capture,utilization and storage(CCUS)retrofitting to the SNG project was assessed.Based on the characteristics of the SNG project and the geological setting of Mongolia,a feasibility study framework was used to assess the potential CCUS project.The feasibility study framework includes evaluation and selection of storage sites,site performance evaluation,project design of full-chain CCUS,techno-economic evaluation,etc.Results showed that there are sufficient high suitability and a huge capacity for CO_(2)aquifer storage in most parts of the Nyalga basin,and the selected site is with low geological risks.The technical scheme of full-chain CCUS is that high purity CO_(2)from industrial separation can be directly compressed and transported to the suitable geological sites nearby by onshore pipeline.It assumed that 90%of the total CO_(2)capture is used for enhancing the recovery of water(CO_(2)-EWR)and 10%is for sale to oil companies for enhancing the recovery of oil(CO_(2)-EOR)projects or other utilizations.The project can annually reduce CO_(2)emissions of 5Mt and produce saline water of 5.13 Mt with a levelized cost of 18.8 USD/t.This study shows that the full-chain CCUS project accompanied by the SNG factory is applicable and low-cost.It is a sign for the low-carbon and sustainable development of fossil-based industries in the Mongolia and other countries of one Belt and one Road region.