摘要
以降低球团生产系统能耗为目标,进一步了解球团生产过程中能流及[火用]流的变化和损失情况,对链箅机—回转窑—环冷机氧化焙烧球团系统进行了热平衡及[火用]平衡计算分析。系统热收入和[火用]收入主要项为燃料化学能和球团氧化。热量消耗主要用于排出废热和外表面散热。传热、燃烧不可逆[火用]损失和系统机体散热[火用]损失为[火用]支出主要部分。针对系统废热余热资源未完全利用情况,提出环冷废气余热循环利用和回转窑表面散热回收等建议,经计算优化后,对于废气余热循环,利用环冷二段与三段废气余热使热效率提高至85.29%、[火用]效率提高至33.40%;回收集热器余热使热效率提高至86.53%、[火用]效率提高至33.93%。研究结果为球团生产提供建议,并结合实际寻找适合该系统的余热利用方案,为节能优化提供参考。
Aiming at reducing energy consumption of pelletizing system,thermal balance and exergic balance of chain grate-rotary kiln-ring cooler oxidation pelletizing system were calculated and analyzed to further understand the change and loss of energic flow and exergic flow during pelletizing process.The analysis shows that the major items of thermal income and exergic income of the system are fuel chemical energy and pellet oxidation.Heat consumption is mainly used to discharge waste heat and external surface heat dissipation.Exergic loss of heat transfer irreversible,exergic loss of combustion and exergic loss of system body heat are major parts of exergic expenditure.In view of the incomplete utilization of waste heat resources in the system,some suggestions are put forward,such as recycling of waste heat from ring cooling exhaust gas and surface heat recovery of rotary kiln.After calculation and optimization,for waste gas waste heat cycle,thermal efficiency increased to 85.29%through the utilization of waste heat in the second and third stages of ring cooling,while exergic efficiency increased to 33.40%.As for collector waste heat recovery,thermal efficiency increased to 86.53%,while system exergic efficiency increased to 33.93%.The research results provide some suggestions for pellet production,and find a suitable waste heat utilization scheme for the system based on the actual situation,so as to provide reference for energy saving optimization.
作者
郭婷宇
沈晓旭
韩依璇
冯亮花
孙玉英
霍兆义
Guo Tingyu;Shen Xiaoxu;Han Yixuan;Feng Lianghua;Sun Yuying;Huo Zhaoyi(University of Science and Technology Liaoning;Shanghai Jiade Environmental Energy Technology Co.,Ltd.)
出处
《冶金能源》
北大核心
2024年第4期15-20,共6页
Energy For Metallurgical Industry
基金
国家自然科学基金(NSFC52074151)
辽宁省科技厅应用基础研究项目(2022JH2/101300079)。
