Experiment Study Of Preventing And Removing Fouling On Vapor-Liquid-Solid Three-Phase Flow In Evaporation

In this paper, further studies were carried out for the influence of CaSO4 fouling in heating tube through vapor-liquid-solid three-phase flow state technology on theory and experiment. The mechanisms of preventing and removing fouling were discussed in the vapor-liquid-solid three-phase circulating fluidized bed. The capability of preventing and removing fouling and enhancing the heat transfer were further reviewed. The influence of induction period of CaSO4 fouling from vapor-liquid-solid three-phase flow state technology was studied, and the result was compared with that of experiment without particle. The decided way of the induction period of fouling has been improved.The experimental results show that the induction period of fouling can be prolonged by adding particles, and solid particle can prevent fouling and enhance heat transfer. The induction period of fouling was lengthens to be nearly 5 times with solid particle than without particle. The more add particles, the more the effect of heat transfer was good. The effect of heat transfer was better when the diameter of particles was bigger. The effect of heat transfer was better in high speed than low speed with adding particles. The experiential equation of CaSO4 rate of mass deposited with particles and without particles was obtained from theoretic analysis to fouling. The agreement between predicted and measured results is excellent.