钢铁高炉煤气二氧化碳捕集技术经济性分析

基于固定单一原料气量导向、固定碳捕集量导向和固定混合原料气量导向3种不同的碳捕集情景，结合不同捕集技术CO₂捕集率与CO₂产品纯度的变化，分析了CO₂捕集对于高炉煤气热值提升的间接经济效益的影响。结果表明:当CO₂捕集率和CO₂产品纯度均一定时，基于固定单一原料气量导向较基于固定碳捕集量导向情景捕集单位质量CO₂提升的热值效益更高；当CO₂捕集率一定时，随着CO₂产品纯度降低，基于固定单一原料气量导向情景与基于固定碳捕集量导向情景捕集单位质量CO₂提升的热值效益均更高；当CO₂产品纯度一定时，随着CO₂捕集率降低，基于固定单一原料气量导向情景捕集单位质量CO₂的热值提升效益越高，而基于固定碳捕集量导向情景捕集单位质量CO₂提升的热值效益降低。

TECHNICAL AND ECONOMIC ANALYSIS OF CARBON DIOXIDE CAPTURE OF IRON AND STEEL BLAST FURNACE GAS

In this study, three carbon capture scenarios were designed, namely fixed quantity raw gas scenario, fixed carbon capture amount scenario, and mixed raw gas scenario. Cases reflecting different CO₂ capture rates and product purity associated with different capture technologies were further designed under each scenario. The impacts of CO₂ capture on the economic benefits of calorific value variation of blast furnace gas were analyzed. When the CO₂ capture rate and CO₂ product purity were equal, the calorific value of CO₂ per unit based on the fixed quantity raw gas scenario was higher than that under the fixed carbon capture amount scenario. When the CO₂ capture rate was fixed, with the reduction of CO₂ product purity, the calorific value benefits of CO₂ per unit mass based on the fixed quantity raw gas scenario and the fixed carbon capture amount scenario were both higher. When the purity of CO₂ product was fixed, with the reduction of CO₂ capture rate, the calorific value of fixed quantity raw gas scenario increased in efficiency, while the calorific value of the fixed carbon capture amount scenario decreased in efficiency.