MULTISTAGE EVAPORATION METHOD FOR SOLUTION USING LIGHT CONDENSING MIRROR MULTITUBE HEAT COLLECTING APPARATUS AND LIGHT CONDENSING MIRROR MULTITUBE HEAT COLLECTING APPARATUS

摘要

PURPOSE:To enable to effectively perform the multistage evaporation, by constructing heat receiving tube in combination with selective absorption tube provided with selective absorption film on the outer face of heat transmission tube and a fixed protective tube and using a fixed heat collecting apparatus provided with plural heat receiving tubes. CONSTITUTION:The selective absorbtion tube 3 constructed by providing the selective absorption film 2 on the outer face of the heat transmission tube 1, is positioned in the protective tube 4 transmitting the light, and the heat receiving tube 5 is formed by reducing pressure of the air between the tubes 3 and 4 and then, light condensing mirror multitube heat collecting apparatus is formed by positioning the tube 5 in the neighborhood of the focus of the plural light collecting mirrors 6. And, the low concentration solution 12 is brought close to the warm water from the flat board-shaped solar water warmer 11 through the heat transmission wall 13 and the medium concentration solution 15 is made by evaporating the moisture as the steam 14 and next, the first high concentration solution 18 is made by passing said solution 15 through the first heat transmission tube 16 and evaporating the moisture as the steam 17. Hereafter, said solution 18 is concentrated successively and the concentrated solution is contained in the highly concentrated solution vessel 36 as the third highly concentrated solution 33 and then, the steam 14, 17, etc., are introduced into the condenser 23 by the low pressure tube 22.