Four-effect Falling Film Evaporator for Coffee Liquor Concentration

A Four-effect evaporator is a combination of 4 sets of single-effect evaporators, the characteristic is that the exhaust steam from the previous effect is reused in the aftereffect as heating source, so as to achieve purpose of energy saving.

        Falling film evaporator, is operated continuously under vacuum and low temperature condition, with features of high evaporation capacity, low energy consumption, low operating cost and could keep the original color, flavor and active ingredient maximize.

Application Scope

        Falling film evaporator has been widely used for water or organic solution in pharmaceutical, food process, chemical industry, light industry and etc, and the waste water treatment of above industries as well, and is is especially for thermosensitive material. The falling film evaporator is able to run continuously under vacuum and lower temperature condition, has advantages of higher evaporation capacity, lower energy consumption, cost saving and ensure the material constant during evaporation.

Main Principle  

        In the multiple-effect evaporator, the Effect I is heated by the live steam, and the exhaust steam from Effect I flows to Effect II and acts as the heating source, thus the live steam consumption is reduced. The total temperature difference between the heating temperature in Effect I and the boiling point in last effect, is distributed in each effect, the temperature difference between effects decreases as the amount of effect increases.

        The water evaporated forms exhaust steam (called as secondary steam) is reused by multiple times, the live steam consumption is reduced, so as to achieve the purpose of energy saving.  

Main Characteristic

1. The multiple-effect evaporator is suitable in case there is sufficient and low-cost steam;

2. It is appropriate for concentration of solution which is of big elevation of boiling point (eg. Sodium hydroxide, calcium chloride and etc);

3. It is recommended if there are various wastewater being treated, which are big differences in physical property and need to be treated separately;

4. The process flow is adjustable based on actual condition, different evaporation process (eg. Forward flow, cocurrent flow, countercurrent flow and cross flow) can be adopted  accordingly.

SYSTEM COMPONENT

        A multiple-effect evaporator is composed of heaters of each effects, separator (crystallizer) of each effects, condenser, thermal compression pump, vacuum pump, material circulating pumps, operation platform, instrumentation and control cabinet, and pipline and fittings. 

TREATMENT CAPACITY

        The evaporation capacity ranges from 200kg/h to 500ton/h maximum, can be customized according to demands. And the evaporator type can be falling film type, rising film type, forced circulation type, external circulation type and etc. And the structure can be tubular type, plate type and scraper type for option.