Studies On The Propelling Force And Heat Exchanging Of The Spontaneously Circular Evaporator

As chemical equipments, evaporators are widely used in chemical plants. A large amount of heating energy is cost in it. During the operation of traditional evaporators, however, crystal fouling is often found on the inside of the heating pipes. This paper analyzes the type of the fouling, the fouling mechanism and the main factors that influence the fouling rate. A narration about the economic loss resulting from the fouling has been made. How to control, to prevent and to clean the fouling are introduced.This paper aims at improving the structure of traditional evaporators as followed. Firstly, the heating chamber is employed to circulating pipe from the ascending pipe to make fuller use of the space and to reduce the height of the equipmentï¼›secondly, an auxiliary heating chamber is installed to enhance the circular driveï¼›thirdly, a roll booster is used to start the circulation and to guarantee the vacuum unit working safelyï¼›fourthly, A type of twisted stripe was introduced which can prevent, clean the fouling and enhance the heating effect. On that base, an experiment is conducted to prove the possibility for the twisted stripe cleanness. A series of data are acquired. The data show the necessary circling velocity is vital for the twisted stripes to work. Through dimension-analyzing method, the relating equation of resisting force that exists in the heating tube with a twisted stripe is achieved. Those unknown coefficients in the equation are attained by another experimentation. Then we can draw the detailed expressing equation. According tothe equation, We adjust the opening-degree of the valve to simulate the working condition of an evaporator in the factory.On the assumption that the evaporation is a complete process in the mocking experiment, the theoretical circling prompting-force equation is achieved. By comparing the result from the theoretical equation with the practical, we find there is a great gap between them, and their proportion is largely the same, about 35%-50%. So we can conclude that the evaporating process in the boiling tube in the evaporator is not a hundred-percent one.During the process of the heating trial, some special procedures are mentioned because of the particularity of circulation. The experiment result shows the degree of evaporation is nearly 55%. It also proves the self-rotational twisted stripe can rotate smoothly to full function.