回转窑内铁矿氧化球团焙烧过程的能量和分析  

Energy and exergy analysis of iron ore pellets induration in the kiln

作　　者：冯俊小[1] 张宇[1] 谢知音[1] 张材[1] 果乃涛[1] 

机构地区：[1]北京科技大学机械工程学院,北京100083

出　　处：《华北电力大学学报（自然科学版）》2009年第3期33-37,共5页Journal of North China Electric Power University：Natural Science Edition

基　　金：国家高技术研究发展计划(863计划)课题(2007AA05Z215)

摘　　要：在对铁矿氧化球团回转窑系统的平衡测试的基础上,对其进行了能量和的分析。能量分析表明,窑体表面散热是能量损失的主要部份。分析表明,燃烧不可逆损是火用损的主要部份。系统的燃烧不可逆损失较大。建议减小助燃空气或压缩空气等非预热空气的供应量的方法降低之。烟气中的含氧量对球团的氧化过程,存在着一定的影响。考察了烟气中氧含量对损的影响。对该参数的优化,可以使损最小化。在满足球团矿焙烧工艺所需氧气含量的前提下,可以适当降低烟气中的含氧量。本文的研究对回转窑内铁矿氧化球团焙烧过程的能量流和火用流有了更进一步的认识。研究结果可以进一步应用于"链-回-环"系统的过程优化,进一步提高系统的经济效益。According to exergy balance test, energy and exergy analysis has been conducted to investigate the thermodynamic characteristics of iron ore pellets induration in the kiln by the‘grate - kiln - cooler＇ （GKC） plant. The energy analysis shows that the energy loss is mainly caused by ones to the environment. And the exergy analysis reveals that the combustion irreversibility is the major source of exergy destruction. The exergy destruction due to the combustion irreversibility of the kiln is larger than any other typical atmospheric combustion system to some extent. Furthermore, decreasing the flow rate of primary air, compressed air, etc non- preheated air is help to diminish the combustion irreversibility and thus the exergy loss. Besides, oxygen content of flue gas in the combustion process influences the pellets oxidization to a certain extent. And on condition that oxygen is sufficient for the pellets oxidization, it can be decrease the oxygen content of flue gas properly. Lastly, the effects of percent oxygen on the exergy losses have been studied. And optimization of this parameter can achieve minimum exergy destruction. This study provides a better understanding of the energy and exergy flows of iron ore pellets induration in the kiln. The findings of the present study can further be applied to perform process optimization to maximize the cost - effectiveness of iron ore pellets induration production by GKC plant.

关 键 词：回转窑 不可逆 能量和分析 氧化球团 焙烧过程 

分 类 号：TF551[冶金工程—钢铁冶金]