Abstract: As an important means to cope with global warming, CO₂ emission reduction has became a hot topic at home and abroad. To study key technology of pre-combustion CO₂ capture system, based on Huaneng(TianJin) 265MW IGCC (integrated gasification combined cycle) demonstration power plant, approximately 10000m³/h syngas was extracted from the gasification unit for CO sulfur tolerant shift, MDEA desulphurization and decarbonization, PDS sulfur recovery technology research. Meanwhile, the process simulation, field testing and system analysis of China's first industrial scaled pre-combustion capture system was completed. The results showed that the full load capture capacity was 78.11 thousand ton per year and the capture unit energy consumption was 2.35 GJ/t(CO₂) with capture ratio ≥ 85%. The simulation results fitted well with the actual operation data. The MDEA system accounted for 93.3% energy consumption of capture system and the thermal regeneration accounted for 81.61% of MDEA energy consumption. At the same time, the CO₂ loss process of the capture system was analyzed. With the application of the four-stage shift converter, the capture ratio increased to 92.29%, while the system consumption almost remained unchanged. The capture energy consumption and cost of CO₂ compression liquefaction was also investigated. The research results can provide theoretical guide for pre-combustion capture design, industrial enlargement and optimization.

Key words: pre-combustion, carbon dioxide capture, IGCC, syngas, simulation

摘要： CO₂减排作为应对全球变暖的重要手段而逐渐成为国内外研究热点。为研究燃烧前CO₂捕集系统关键技术，以华能（天津）265MW级整体煤气化联合循环发电系统（IGCC）示范电站为依托，从气化装置抽出合成气约10000m³/h（标况下），进行一氧化碳耐硫变换、甲基二乙醇胺（MDEA）硫碳共脱、PDS硫回收等技术研究，同时完成我国首套工业规模级燃烧前捕集工艺模拟、系统分析及现场测试。研究结果表明：满负荷运行工况下，每年可捕集CO₂ 7.811万吨，系统单位能耗2.35GJ/t（CO₂），CO₂捕集率≥ 85%；模拟结果与实际运行数据相吻合。其中MDEA工段能耗占捕集能耗的93.3%，热再生部分则占MDEA工段能耗的81.61%；同时分析了捕集系统各工段CO₂损失过程，增加四段变换可使系统能耗基本不变同时捕集率增加至92.29%；考察了CO₂压缩液化工段能耗及成本。本研究结果可为燃烧前CO₂捕集的设计、工业放大及过程优化提供理论支持。

关键词: 燃烧前, 二氧化碳捕集, 整体煤气化联合循环发电系统, 合成气, 模拟