抛煤机链条炉内流动特性数值模拟  

Numerical simulation on the internal flow character of spreader-stoker boiler

作　　者：李景明[1] 席文奎[1] 何国安[2] 顾国彪[3] LI Jingming;XI Wenkui;HE Guoan;GU Guobiao(College of Mechanical Engineering,Xi'an Shiyou University,Xi'an 710065,China;Xi'an Thermal Power Research Institute Co.,Ltd.,Xi'an 710054,China;Institute of Electrical Engineering,Chinese Academy of Science,Beijing 100190,China)

机构地区：[1]西安石油大学机械工程学院,陕西西安710065 [2]西安热工研究院有限公司,陕西西安710054 [3]中国科学院电工研究所,北京100190

出　　处：《热力发电》2018年第4期24-29,共6页Thermal Power Generation

基　　金：国家自然科学基金项目(51405385);陕西省自然科学基础研究计划资助项目(2016JM5046)~~

摘　　要：抛煤机链条炉内部结构对其内部流场分布和燃烧效果影响较大,是造成燃烧效率不佳和环境污染的重要原因。本文通过建立UG-35/39-M抛煤机链条炉内部流场物理数学模型,分析不同前拱角条件对冷态条件下炉内流场特性的影响。结果表明:炉内增拱能在前拱上方形成稳定回流区,且随着拱角的增大回流区呈减小趋势直至消失,实验范围内15°拱角炉拱对炉内气流组织的效果最好;回流区的存在能够降低炉内气体流速,延长气体停留时间,增强炉内气体混合效果;增拱在改善炉内燃烧和传热条件的同时,会造成炉内冲蚀磨损现象的加剧,对锅炉的安全运行产生不利影响。The internal flow distribution and combustion characteristics are greatly affected by the structure of spreader-stoker boiler,which is the main cause of poor combustion efficiency and environmental pollution.In this study,the physical and mathematical models of the internal flow field are established on the base of UG-35/39-M spreader-stoker boiler.And the effect of front arch angle on the cold internal flow field is studied.The results show that there is a steady recirculation zone above the front arch.With the increase of the front arch angle,the recirculation zone tends to decrease until it disappears.Within the experimental range,the internal flow works best when the front arch angle is 15°.The presence of the recirculation zone reduces the velocity of air,prolongs the residence time and enhances the air mixing effect in the boiler.The increased arch angle can improve the combustion and heat transfer conditions in the furnace.Meanwhile,it can aggravate the erosion of the furnace and adversely affect the safe operation of the boiler.

关 键 词：抛煤机 链条炉 增拱 流场 回流 拱角 燃烧效率 

分 类 号：TK224[动力工程及工程热物理—动力机械及工程]