氨法吸收高炉煤气中CO_(2)过程传热传质模型

Heat and mass transfer model of CO_(2) absorption from blast furnace gas by ammonia process

捕集高炉煤气中的CO_(2)可有效减少钢铁联合企业碳排放,提高高炉煤气热值。为掌握氨法吸收高炉煤气中CO_(2)过程的传热传质规律,建立了吸收塔内气液两相CO_(2)质量传递和守恒、气液两相热量传递和守恒的控制方程及其边界条件的数学模型,分析了填料层高度、氨水浓度、液气比等因素对吸收性能的影响。结果表明:模型可以用来分析高炉煤气CO_(2)的氨法吸收过程的传热传质规律,氨水浓度和填料层高度对脱除率影响较大。研究为高炉煤气碳捕集提供了理论基础。

Capture of CO_(2) in blast furnace gas can effectively reduce carbon emission of iron and steel complex and improve the calorific value of blast furnace gas.In order to master the law of heat and mass transfer in the process of absorbing CO_(2) from blast furnace gas by ammonia method,the governing equations of mass transfer and conservation of CO_(2) in gas-liquid two-phase and heat transfer and conservation of gas-liquid two-phase in the absorption tower were established,and the mathematical models of boundary conditions were established.The effects of packing layer height,ammonia concentration,liquid gas ratio and other factors on the absorption performance were analyzed.The results show that the model can be used to analyze the heat and mass transfer law in the ammonia absorption process of CO_(2) from blast furnace gas,and the ammonia concentration and packing layer height have great influence on the removal rate.The research provides a theoretical basis for carbon capture of blast furnace gas.