Session: FSI-01-01 Thermal Hydraulic Phenomena with Vessels, Piping and Components

Paper Number: 106129

106129 - Cfd Simulation of Gas-Liquid Non-Uniform Erosion in Connection Pipeline of Silicon Tetrachloride Hydrogenation Reduction Process 

ABSTRACT: Modified Siemens method is the mainstream craft in polycrystalline silicon production, and the pipeline occurring serious erosion in the preparation process of trichlorosilane by silicon tetrachloride hydrogenation reduction, The erosion can impact the long-cycle safety operation of the equipment, in some severe cases, causing leak, fire and explosion accidents and resulting in economic losses and personal injury. In this paper, a leakage accident case that was caused by the erosion happened in connecting pipeline between static mixer and silicon tetrachloride evaporator of polycrystalline silicon production equipment that use the modified Siemens process was calculated .The gas-droplet erosion phenomenon was predicted by the Euler-Lagrange method, for example, the dense discrete particle model (DDPM), and the influences of non-uniform agglomeration structure on the fluid-particle two-phase interaction were considered by coupling the energy-minimization multi-scale (EMMS) traction model into DDPM. The effects of the operating parameters including atomization droplet particle size, hydrogen volume fraction and other on the location and erosion rate of this industrial pipeline were simulated and investigated, and the reasons why the leakage accidents happened were analyzed. The results of studies suggest that, compared with the traditional uniform interphase traction model, the EMMS traction model can significantly improves the prediction accuracy. The different atomized droplets particle sizes can affect the erosion location in pipeline, and the prediction datas were consistent with the thinning datas of the failed pipeline when atomized droplet size is 100 μm. The flow rate increases with the increase of hydrogen volume fraction, which also affects the erosion location and rate. In addition, the pipeline erosion leakage accident occurring can attribute primarily to poor atomization and high gas-liquid flow rate.

Key words: silicon tetrachloride hydrogenation, erosion wear, gas-liquid non-uniform erosion, the DDPM, the EMMS

Presenting Author: Jiarui Shi Technology Innovation Center of Risk Prevention and Control of Refining and Chemical Equipment for State Market Regulation, China Special Equipment Inspection and Research Institute

Presenting Author Biography: Jiarui Shi, male, born in 1999, is a master's student, now mainly engaged in the research of multiphase flow pipeline erosion. Address: China University of Petroleum (East China), No. 66 Changjiang West Road, Huangdao District, Qingdao, Shandong, 266580, China. Tel: 8615020612953. Email: shijryx@163.com.

Authors:

Jiarui Shi Technology Innovation Center of Risk Prevention and Control of Refining and Chemical Equipment for State Market Regulation, China Special Equipment Inspection and Research Institute
Sheng Chen Technology Innovation Center of Risk Prevention and Control of Refining and Chemical Equipment for State Market Regulation, China Special Equipment Inspection and Research Institute
Meng He Technology Innovation Center of Risk Prevention and Control of Refining and Chemical Equipment for State Market Regulation, China Special Equipment Inspection and Research Institute
Min Liu Technology Innovation Center of Risk Prevention and Control of Refining and Chemical Equipment for State Market Regulation, China Special Equipment Inspection and Research Institute
Liyun Zhu China University of Petroleum (East China)
Guoshan Xie Technology Innovation Center of Risk Prevention and Control of Refining and Chemical Equipment for State Market Regulation, China Special Equipment Inspection and Research Institute
Jiangyun Wang China University of Petroleum (Beijing)