气力输送系统中弯管的易磨损位置及其机理分析  

Positioning the Erosion Wear of Bend Pipes in the Pneumatic Conveying System

作　　者：封凯 聂伟[1] 陈凤官 郝振华[1] 赵建涛[1] FENG Kai;NIE Wei;CHEN Fengguan;HAO Zhenhua;ZHAO Jiantao(State Key Laboratory of Coal Conversion,Institute of Coal Chemistry,Chinese Academy of Sciences,Taiyuan 030001,China;University of Chinese Academy of Sciences,Beijing 100039,China;Hefei General Machinery Research Institute,Hefei 230088,China)

机构地区：[1]中国科学院山西煤炭化学研究所,煤转化国家重点实验室,山西太原030001 [2]中国科学院大学,北京100039 [3]合肥通用机械研究院有限公司,合肥230088

出　　处：《化学反应工程与工艺》2021年第2期106-112,共7页Chemical Reaction Engineering and Technology

基　　金：国家重点研发计划(2018YFC0808503);山西省重点研发计划(201903D121018)。

摘　　要：气力输送技术应用广泛,但管件磨损问题影响安全性和经济性,其中弯管磨损问题是关键的磨损问题,因此确定弯管易磨损位置具有重要意义。本研究通过实验方法采用涂层模型并结合电容层析成像(ECT)测量,考察了表观气速、固体流率和颗粒粒径对不同弯径比(R/D)弯管的易磨损位置的影响。研究结果表明:在低气速时(约11 m/s),磨损位置位于磨损点高度与管路内径之比(h/D)为0.5处,即管截面圆心在弯管管壁的映射位置,随着表观气速增加到大于临界气速,磨损位置开始下移,最后稳定在映射位置下方h/D为0.2处;固体流率、颗粒粒径和弯径比能够影响该临界气速,临界气速与固体流率和弯径比成负相关,而与颗粒粒径成正相关;在一定气速范围内,固体流率的增加会引起磨损位置下移。Pneumatic conveying technologies are widely used in various industrial processes.Erosion wear is the key factor affecting the safety and economical efficiency of the conveying processes.It is of great significance to determine the erosion position of the bend pipes for the prevention from pipeline erosion wear.In order to investigate the impact of the superficial gas velocity,solid flow rate and particle diameter on the erosion position of the bend pipe with different ratios bending diameter(R/D),a thin coating layer was applied on the inner wall of the bend pipe to determine the erosion position.Additionally,electrical capacitance tomography(ECT)measurements were also performed to detect the solid concentration distribution on the cross-section of the bend pipe inlet.Erosion position was defined using height definition and the ratio of height of erosion position to pipediameter(h/D)as a unit.It was found that the erosion position may be located at h/D 0.5 when the gas velocity was about 11 m/s or more.As the gas velocity grew above a critical gas velocity,the erosion position started to descend and finally reached h/D 0.2.The solid flow rate,the diameter of particle and the R/D ratio could affect the critical gas velocity.The critical gas velocity had a negative correlation with the solid flow rate and the R/D ratio,while it had a positive correlation with the diameter of particle.When the gas velocity was in a certain range,increase of the solid flow rate could lead to the downward movement of the erosion position.

关 键 词：气力输送 磨损 弯管 

分 类 号：TQ022.3[化学工程] TQ018