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、火用流图,并建立相关能量评价指标,采用热平衡方法和火用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、火用量损失、热效率与火用效率。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%,火用利用效率分别为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。
Abstract
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 balance 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 resources. The results show that, the thermal efficiency of ring cooler and waste heat boiler were 26.78% and 45.60%, respectively, 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-solid heat transfer in sintering bed.
关键词
环冷机 /
余热 /
回收利用 /
热效率 /
?效率
{{custom_keyword}} /
Key words
ring cooler /
waste heat /
recovery and utilization /
thermal efficiency /
exergy efficiency
{{custom_keyword}} /
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
参考文献
[1] 蔡久菊, 王建军, 陈春霞, 等. 钢铁企业余热资源的回收与利用[J]. 钢铁, 2007, 42(6): 1~7.
[2] 董 辉, 王爱华, 冯军胜等. 烧结过程余热回收利用技术进步与展望[J]. 钢铁, 2014, 49(9): 45~48.
[3] 贾冯睿, 王恩刚, 赫冀成, 等. 烧结过程余热资源回收与利用技术[J]. 工业加热, 2014, 43(4): 45~48.
[4] 徐国群. 烧结余热回收利用现状与发展[J]. 世界钢铁, 2009,1(05): 27~31.
[5] 蔡九菊, 王建军, 陆钟武, 等. 钢铁企业物质流与能量流及其相互关系[J]. 东北大学学报, 2006, 27(9): 27~28.
[6] 刘文超, 蔡九菊, 董 辉等.烧结过程余热资源高效回收与利用的热力学分析[J].中国冶金,2013,23(2):15~20.
[7] 傅秦生. 能量系统的热力学分析方法[M]. 西安:西安交通大学出版社, 2005.
[8] 朱明善. 能量系统的?分析[M]. 北京:清华大学出版社, 1988.
[9] 汤学忠. 热能转换与利用[M]. 北京:冶金工业出版社, 2002.
[10] 董 辉,林贺勇,张浩浩,等. 烧结热工测试与分析[J]. 钢铁, 2011,46 (11): 93~98.
[11] 孙用军, 董 辉, 冯军胜等.烧结-冷却-余热回收系统热力学分析[J].钢铁研究学报,2015,27(1):16~21.
{{custom_fnGroup.title_cn}}
脚注
{{custom_fn.content}}