高效石灰窑烟气熔融钢渣气淬固碳同步余热回收工艺分析

　　

摘 要：现阶段钢厂处理钢渣技术面对碳排放量大、钢渣稳定性差和大量的热资源浪费的问题。针对目前钢铁企业生产中存在的问题，提出一种利用石灰窑烟气进行熔钢渣气淬固碳同步余热利用的新方法，可实现钢渣气淬粒化、钢渣碳化和烟气脱碳和同步回收钢渣余热。为保证钢渣固碳反应顺利进行、反应气氛中CO₂充足，补充固碳反应气体，同时利用Aspen Plus软件对工艺进行模拟计算，探究反应工况（反应温度、初始CO₂浓度、补充流量）变化对工艺余热回收性能（理论回收热总量、㶲回收总量）的影响。提高反应温度、初始CO₂浓度和增加补充流量都能够促进余热回收，而为了达到最优理论㶲回收，针对不同工况需调整反应温度和补充流量的参数。当将石灰窑烟气作为原始烟气时，反应温度应处于较高水平（550、600 ℃）。

关键词：联合循环；超临界；亚临界；蒸汽参数；循环效率

Abstract: At the present stage, the treatment of steel slag in steel mills is faced with several challenges, including high carbon emissions, poor stability of steel slag, and significant waste of heat resources. In light of these issues, a new approach is suggested to address the production problems in iron and steel enterprises. This method involves the utilization of flue gas from lime kilns for gas quenching and carbon solidification of molten steel slag, while simultaneously recovering waste heat. This approach enables the quenching and granulation of steel slag, carbonization of steel slag, decarbonization of the flue gas, and recovery of waste heat from steel slag. To ensure a smooth solidification reaction of steel slag and sufficient CO₂ in the reaction theoretical re-covered heat and total exergy recovery, increasing the reaction temperature, initial CO₂ atmosphere, supplementary solidification reaction gas is provided. The process is simulated using Aspen Plus software to investigate the impact of changes in reaction conditions (reaction temperature, initial CO₂ concentration, and supplemental flow rate) on the performance of waste heat recovery, including the total concentration, and supplemental flow rate can promote the recovery of waste heat, and in order to achieve the optimal theoretical exergy recovery, the parameters of reaction temperature and supplemental flow rate need to be adjusted for different working conditions. When the lime kiln flue gas is used as the original flue gas, the reaction temperature should be at a high level (550, 600 °C).

Key words: Lime kiln flue gas; Waste heat recovery; Aspen Plus

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