环冷机余热回收与利用系统的能量分析

Energy analysis of waste heat recovery and utilization system for ring cooler

根据某钢厂的环冷机系统回收与利用烧结矿显热的工艺流程,绘制了能流图、流图,并建立相关能量评价指标,采用热平衡方法和分析方法对环冷机的余热回收利用状况进行研究,分析了余热资源在回收与利用过程中的热量损失、量损失、热效率与效率。结果表明:环冷机、余热锅炉2个环节的热效率分别为26.78%和45.60%,利用效率分别为22.88%和45.08%,环冷机是余热回收与利用的薄弱环节;目前影响余热回收与利用的主要因素是环冷机取热段的漏风问题、第三段冷却废气所携带的显热尚未被利用以及烧结矿层的气固换热过程。

Based on the process of waste heat recovery from sintering and utilization system for ring cooler,the energy flow diagram and the energy flow diagram were draw,the relevant energy evaluation was established. The thermal bal-ance method and exergy analysis were applied to study waste heat utilization in a ring cooler,such as heat loss,energy loss,thermal efficiency and energy efficiency during the process of the conversion and utilization for waste heat resourc-es. The results show that,the thermal efficiency of ring cooler and waste heat boiler were 26.78%and 45.60%,respective-ly,the corresponding energy efficiencies were 22.88%and 45.08%,respectively,hence,ring cooler was the weak link during the recovery and utilization of waste heat system. The main factors affecting the recovery and utilization of waste heat were the air leakage of ring cooler,Un-utilization of sensible heat of the third cooling gas and the process of gas-sol-id heat transfer in sintering bed.