Study on the movement and deposition of particles in supercritical water

The movement and deposition of fine particles in supercritical water is closely related to the safe operation of supercritical water reactors and supercritical thermal power units. When deposition of corrosion particles occurs, it will affect the heat exchange of the pipe wall and cause the wall temperature to rise rapidly. It will seriously threaten the safe and stable operation of supercritical water reactors or supercritical thermal power units. In this paper, the ANASYS numerical software was used to simulate the movement of fine particles in supercritical water. The effects of parameters such as heating power, inlet temperature, inlet velocity, average particle diameter, and asymmetry of heating on the influence of fine particles in the supercritical water were investigated. The results show that with the increase of inlet temperature, the peak value of particle deposition concentration gradually approaches the inlet section of the pipe. With the increase of inlet velocity, the peak value of particle concentration gradually moves to the outlet of the pipe. The heating of the pipe has a certain inhibitory effect on the concentration and deposition of particles. The simulation result of the particles deposition has been compared and verification with the existing experimental data. The verification results show that the particle deposition concentration distribution characteristics obtained by the simulation and the experimental data are consistent. It facilitates the mechanism analysis of the movement and deposition characteristics of the fine particles in the supercritical water. It is conducive to the safe design of supercritical water reactors. (C) 2019 Elsevier Ltd. All rights reserved.