摘要
在自主搭建的工业级管径(内径50 mm)气力输送实验平台上开展了密相气力输送实验,对气固两相通过弯管的流动特性进行了研究。借助电容层析成像技术分析弯管出口截面流型特征,发现煤粉流经弯管时管道截面浓度存在明显的径向分布,外壁浓度相对较高。采用附加压降法,并结合对实验数据的回归分析,建立了精度±10%以内弯管压降模型。并基于微元分析和弯管压降分布的基本规律,获得了煤粉浓度沿弯管流动方向的分布特征。
Experiments on dense phase pneumatic conveying of pulverized coal were carried out in the self-built pneumatic conveying facility with an industrial pipe diameter of 50 mm.The gas-solid two-phase flow characteristics through the bend were studied.With the help of Enick and Klinzing model,the entrance length of gas-solid two-phase flow in a bend outlet was calculated.It was found that the fluid flow to the electrical capacitance tomography(ECT)was not fully developed,and the fluid was affected by the bend.The flow patterns of the outlet section of the bend were analyzed in the means of ECT,and it was found that the flow pattern changed from the packed bed flow to the unstable/stable plug flow with the increase of the superficial gas velocity.Due to the influence of inertial force and centrifugal force,there was an obvious radial distribution in the concentration of the pipe section when the pulverized coal flowed through the bend,while the coal concentration on lateral wall surface was relatively high.Regression analysis of experimental data was carried out using pressure drop model and dimensional analysis method,a pressure drop model of pulverized coal dense phase pneumatic conveying bend was established by providing errors most smaller than±10%.Finally,based on micro element analysis and pressure drop distribution along the bend,the distribution characteristics of pulverized coal concentration along the bend were obtained.This work may provide important guiding significance in reducing the wear of bend.
作者
王翀
陆海峰
郭晓镭
刘海峰
龚欣
WANG Chong;LU Haifeng;GUO Xiaolei;LIU Haifeng;GONG Xin(Shanghai Engineering Research Center of Coal Gasification,East China University of Science and Technology,Shanghai 200237,China)
出处
《华东理工大学学报（自然科学版）》
CAS
CSCD
北大核心
2021年第6期676-683,共8页
Journal of East China University of Science and Technology
基金
国家自然科学基金资助项目(51876066)
国家重点研发计划资助(2018YFC0808500)
上海煤气化工程技术研究中心(18DZ2283900)
中央高校基本科研业务费专项资金。
关键词
密相气力输送
弯管
流型
浓度
压降
dense phase pneumatic conveying
bend
flow pattern
concentration
pressure drop
