Customized stainless steel multi effect falling film evaporator for Pharmaceutical effluent treatment
Multiple-effect evaporators maximize steam economy as vapor generated from one effect is used to drive another. This type of multiple-effect system is perfect for continuous feed applications, as fluids are progressively reduced in each effect to final concentration discharge. The evaporator design, based on patented technologies, is ideal for multiple-effect systems, as each effect can be optimized for both vapor and fluid functional conditions to achieve optimum evaporation. This ability, together with our complete system design, allows us to lead the market for efficiency and reliability.
Structure and performance characteristics
The evaporator consists of a heating chamber and a vapor-liquid separation chamber. The evaporating unit is composed of more than two evaporators, heat pump, inlet and outlet pumps of each effect, vacuum device, detection instrument, pipeline and valve. The heating chamber is mainly composed of shell, tube bundle distributing device and connecting pipe, while the vapor-liquid separation chamber is mainly composed of shell and foam thrower.
a. The unit can adopt the downstream continuous feeding method, or the countercurrent or mixed feeding method. The flow direction of the solution is the same as that of the heating steam, and the raw material is preheated to the boiling point by the preheater before entering the first effect. Since the boiling point of the pre effect solution is higher than that of the post effect solution, the material will become superheated and evaporate by itself when it enters the post effect solution. Meanwhile, part of the pre effect condensate can also evaporate by itself when it enters the post effect solution, so more secondary steam can be generated. In counter current feeding, the raw material is fed by the third effect and discharged by the first effect after the second effect. When mixing and feeding, the raw materials are fed by the third effect and discharged by the second effect after the first effect.
b. With the help of adiabatic compression, the saturation temperature of some primary and secondary steam in steam jet heat pump increases, and then returns to the primary heating chamber as heating steam, so as to improve the economy of steam.
c. The static distributor makes the material flow evenly and effectively in the inner wall of the tube after entering the feeding tube from the top of the heating chamber, so the heat transfer coefficient is greatly improved. At the same time, the temperature loss caused by the static head of the liquid column can be ignored, so the effective temperature difference of the falling film evaporator is large under the same conditions.
d. The residence time of the solution in the evaporator is short, so it is especially suitable for the evaporation of heat sensitive materials.
Where is it used, the application of Multi-effect Evaporation System?
Food Industry, Waste water treatment, Concentration and Crystallization.
What is the component part of this MEE Evaporator?
Heat Exchanger, recirculation pump, separator, condenser, transfer pump, condensate pump, vacuum pump, operation platform, control system.
Increase in the number of stages to reduce steam consumption.
With or without salt separation.
Different preheating concepts.
Vapour condensation of the vapour of the final stage in mixing or surface condensers.
Entry of the solution to be evaporated into the first stage (parallel flow) or into the last stage (counter flow). Accordingly, the concentrate is discharged cold (parallel flow) or hot (counter flow) from the plant.
Technical parameters of falling film evaporator
|Type||Single effect||Double effect||Three effect|
|Evaporative capacity (kg/h)||300-2000||1200-4000||3600-15000|
|Feeding material density %||According to material|
|Discharge material density %||According to material|
|Steam consumption / Evaporative capacity(with heat pressure pump)||0.65||0.38||0.28|
|Cooling water consumption / Evaporative capacity (inlet 20°C, outlet 40°C)||28||11||8|
|Note: we can design custom product according customer's requirement.|
Working principle drawing