摘要
火电厂脱硫循环泵叶轮易受腐蚀性浆液冲击腐蚀而失效,为进一步研究现实工况下叶轮发生冲击腐蚀的影响因素及规律,采用CFD数值模拟的方法,基于稠密离散相(DDPM)模型对循环泵叶轮在不同固相颗粒粒径和不同固相颗粒体积分数工况下进行数值模拟。结果表明:当粒径d<0.20 mm时叶片工作面冲蚀量增长速率最快,达到了38%,随着粒径增加,工作面上的冲蚀位置向后盖板处偏移,且叶片进口边出现冲蚀量极值。在不同颗粒体积分数工况下,随着颗粒体积分数增加,工作面上冲蚀位置会向出口处偏移。当颗粒体积分数在30%以上会加剧叶片工作面的冲蚀量。叶片进口边、叶片背面冲蚀量增长速率较为稳定,基本保持在20%上下。可见小粒径颗粒对叶片工作面冲蚀量影响较大,大粒径颗粒更容易加速叶片进口边的冲蚀。高颗粒体积分数对工作面的冲蚀更为明显。
In order to further study the influencing factors and laws of impeller impact corrosion under real working conditions,the impeller of the circulating pump was numerically simulated under different solid particle sizes and different solid particle volume fractions based on the dense discrete phase(DDPM)model by using the CFD numerical simulation method.The results show that when the particle size is less than 0.20 mm,the erosion amount of the blade working face increases the fastest,reaching 38%,and with the increase of particle size,the erosion position on the working face shifts to the rear cover,and the extreme value of erosion occurs at the inlet edge of the blade.Under different particle volume fraction conditions,the erosion position on the working face shifts to the outlet with the increase of particle volume fraction.A solid particle volume fraction of more than 30%will aggravate the erosion of the leaf working face.The growth rate of erosion at the inlet edge and back of the blade was relatively stable,basically remaining at around 20%.It can be seen that small particles have a great influence on the erosion amount of the leaf working face,and large particles are more likely to accelerate the erosion of the inlet edge of the blade.The erosion of the working face is more obvious by the high particle volume fraction.
作者
田浚哲
何建军
余仁强
杜悦欣
段子豪
唐志伟
TIAN Junzhe;HE Jianjun;YU Renqiang;DU Yuexin;DUAN Zihao;TANG Zhiwei(College of Energy and Power Engineering,Changsha University of Science&Technology,Changsha 410114,China)
出处
《能源研究与管理》
2024年第1期90-95,103,共7页
Energy Research and Management
基金
湖南省自然科学基金资助项目(2021JJ30711)。
关键词
脱硫循环泵
叶轮
稠密离散相
冲蚀
数值模拟
desulfurization circulation pump
impeller
dense discrete phase
erosion
numerical simulation
