超超临界锅炉水冷壁近壁面颗粒特性及冲刷磨损研究  

Numerical simulation of particle characteristics and erosion wear near the wall of water cooled ultra supercritical boiler

作　　者：周钱 钱进[1] 王康 林志恒 邓传记 殷金桥 刘动力 ZHOU Qian;QIAN Jin;WANG Kang;LIN Zhiheng;DENG Chuanji;YIN Jinqiao;LIU Dongli(College of Electrical Engineering,Guizhou University,Guiyang 550025,China;State Power Investment Group Guizhou Jinyuan Chayuan Power Generation Co.,Ltd.,Bijie 551700,Guizhou,China;Central Southern China Electric Power Design Institute Co.,Ltd.,China Power Engineering Consulting Group,Wuhan 430060,China)

机构地区：[1]贵州大学电气工程学院,贵阳550025 [2]国家电投集团贵州金元茶园发电有限责任公司,贵州毕节551700 [3]中国电力工程顾问集团中南电力设计院有限公司,武汉430060

出　　处：《智能计算机与应用》2024年第5期136-143,共8页Intelligent Computer and Applications

基　　金：国家电投贵州金元茶园发电公司科技项目(CPCEC-ZCB-13-2022-16-11);贵州省科技支撑计划项目([2020]2Y040)。

摘　　要：CFB锅炉水冷壁冲刷、磨损、减薄及保管问题造成了机组运行安全性、可靠性降低,为研究超超临界参数锅炉水冷壁近壁面颗粒特性,通过数值模拟的方法对BMCR工况下炉膛整体颗粒特性、不同粒径和不同冲击角下水冷壁墙角区域颗粒特性进行分析。研究结果表明:BMCR工况下,炉膛颗粒体积分数呈“马鞍形”分布;颗粒在水冷壁墙角区域向下运动时,墙角中心区域和水冷壁管迎风侧的颗粒体积分数更高,在墙角内测,颗粒体积分数对相对磨损量影响更大,在墙角外侧颗粒速度对相对磨损量影响更大;颗粒冲击角度越大,获得的高水平方向速度分量越大,受到来自炉膛中心流体的裹挟作用也越大,墙角内侧更容易形成高速度区域,水冷壁迎风侧壁面整体相对磨损量大于背风侧。The problems of erosion,wear,thinning,and storage of the water cooled wall of CFB boilers have led to a decrease in the safety and reliability of unit operation.In order to study the particle characteristics near the wall surface of the water cooled wall of ultra supercritical parameter boilers,numerical simulation is used to analyze the overall particle characteristics of the furnace under BMCR conditions,as well as the particle characteristics in the corner area of the water cooled wall with different particle sizes and impact angles.The research results indicate that under BMCR conditions,the volume fraction of furnace particles exhibits a"saddle shaped"distribution;When particles move downwards in the corner area of the water-cooled wall,the particle volume fraction in the center area of the wall corner and on the windward side of the water-cooled wall tube is higher.When measured inside the wall corner,the particle volume fraction has a greater impact on relative wear,while the particle velocity outside the wall corner has a greater impact on relative wear;The larger the angle of particle impact,the greater the velocity component in the high horizontal direction obtained,and the greater the entrainment effect of the fluid from the center of the furnace.The inner side of the wall corner is more likely to form a high velocity area,and the overall relative wear on the windward side of the water-cooled wall is greater than that on the leeward side.

关 键 词：超超临界参数 水冷壁 颗粒特性 相对磨损量 

分 类 号：TK229.6[动力工程及工程热物理—动力机械及工程]