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By film evaporator advantage significantly, falling film evaporator has a high coefficient of heat transfer, heat transfer temperature difference loss small, suitable for heat-sensitive materials, easy to implement multiple effect evaporation operation, suitable for viscous material advantages, such as, therefore widely used in the evaporation from all walks of life to work in the chemical industry, light industry and food processing is widely used in the industry, to achieve the goal of liquid concentration. Falling film evaporator tube side material taken from the tube into the heat exchange tube, with rotary vacuum evaporator the aid of its own gravity to downstream along the tube wall, before entering the heat exchange tube, need cloth fabric membrane, membrane and thus enter the heat exchange tube will show thin film shape, in the process of material from top to bottom water is evaporated, so as to achieve the aim of material enrichment, the shell side if it is to use steam condensation heating or thermal oil heating, if use steam is top down out, if choose heat conduction oil should be from the bottom up. Thus, the flow direction of medium tube inside and outside are not necessarily reverse flow. Falling film evaporator structure actually not complex, can rotovap distillation be simple to understand for vertical inside the shell and tube heat exchanger with a cloth membrane device, but it has an obvious difference with ordinary heat exchanger, the shell side fixation for heating fluid, in the fixed passes to evaporate materials. But it is not important, basic unchanged by film evaporator for pipe pressure, does not cause the fluid temperature change, the tube medium temperature change is caused by the medium concentration change and boiling point.


Falling film evaporator to concentrate the material liquid from the pump to the top of the heating tube, liquid film flowing down along the heat pipe wall formation. In the process, because the outside of the tube heating, the tube liquid film began to boil and evaporation. At the bottom of the column tube and its downstream of the separator, the rest of the liquid and vapor to falling film evaporator is widely used in glucose, starch sugar, oligosaccharides, malt sugar, sorbitol, fresh milk, fruit juice, vitamin C, maltodextrin, etc. The concentration of aqueous solution. And can be widely used in monosodium glutamate, the treatment of waste liquid alcohol, fish meal, etc. Falling film evaporator has a high coefficient of heat transfer, heat transfer temperature difference loss small, suitable for heat-sensitive materials, easy to implement multiple effect evaporation operation, suitable for viscous material advantages, such as, therefore widely used in various industries evaporation in the homework. Process operating conditions for low temperature evaporation, heat transfer temperature difference is small, and is suitable for evaporation of the thermal wiped film distillation sensitive material. Falling film evaporator is the material liquid from falling film evaporator tube box on the heating chamber, the liquid distribution and film forming device, even within the assigned to each heat exchange tube, under the action of gravity and vacuum induction and airflow, into homogeneous membrane flow from top to bottom. The shell side of the flow in the process, by heating medium heating vaporization and separation of the steam produced from the liquid into the evaporator chamber, the vapour liquid after the separation, the steam entering the condenser condensate (single-effect operation) or to the next.


Double-effect falling film evaporator is to first two falling film evaporator, in series with the operating system. Use fresh steam, then effect due to the evaporation heat, produced by the secondary steam, into the second effect, as a secondary effect evaporator heat source. The equivalent of steam was used for two times. To achieve the purpose of saving energy and reducing consumption. To reduce the steam consumption, but also reduce the evaporation of secondary steam condensate. Therefore, double steam than average at around 0.57 ~ 0.6. Falling film evaporator points: single, double, three, four, five, six effect evaporator, applicable to the milk, glucose, xylose, pharmaceutical, chemical and biological engineering, environmental engineering, waste recycling industry such as low temperature concentration.