Falling film evaporators are mainly used for evaporating and concentration of water or organic solvent solutions in the pharmaceutical, food, chemical, light industry, etc., and can be widely used in waste liquid treatment in the above industries. Especially suitable for heat-sensitive materials, the equipment is operated continuously under vacuum and low temperature conditions. It has high evaporation capacity, energy saving, low operating cost, and can guarantee the material invariance in the evaporation process. The following small series introduces the function of the falling film evaporator and the characteristics of the falling film evaporator.
Falling film evaporator effect
Falling film evaporation is to add the material liquid from the tube box on the heating chamber of the falling film evaporator, and evenly distributed into the heat exchange tubes through the liquid distribution and film forming device. Under the action of gravity and vacuum and air flow, it becomes a uniform film. Top down. During the flow process, it is heated and vaporized by the shell-side heating medium, and the generated steam and the liquid phase together enter the separation chamber of the evaporator. The vapor and liquid are separated sufficiently, the vapor enters the condenser to condense (single-effect operation) or enters the next effect evaporator. The medium is heated to achieve a multi-effect operation, and the liquid phase is discharged from the separation chamber.
Falling film evaporator process
1, downstream
Both the solution and the steam flow in the same direction, and they all flow from one effect to the last. The raw material liquid is pumped into one effect, and depending on the pressure difference between each effect, it automatically flows into the next effect, and the completed liquid is pumped out from the final effect (usually operated under negative pressure). Since the pressure of the latter effect is low, the boiling point of the solution is also low, and the solution will flash part of the water from the pre-effect to the latter effect, resulting in more secondary vapor, because the after-effect concentration is higher than the pre-effect and the operating temperature is low. The first heat transfer coefficient is often much higher than the final efficiency. The downstream process is generally suitable for processing heat-sensitive materials in the presence of high concentrations.
2, countercurrent
The raw materials are sent to the pre-effect by the pump from the final effect, the completion solution is discharged by one effect, and the feed solution and the steam flow in the opposite direction. It is generally suitable to handle a solution with a large variation in viscosity with temperature and concentration, and it is not easy to handle heat-sensitive materials.
3, mixed flow
It is a combination of forward and backward flows. It combines the advantages of forward flow and reverse flow to avoid shortcomings. However, the operation is complex and requires a high degree of self-control.
4, advection
All effects are fed with finished liquid, each effect has crystallized, can be separated and crystallized in time, and is generally used for evaporation of saturated solution.
Falling film evaporator product features
1. The entire heating system of the equipment is characterized by uniform steam heating and liquid-liquid flow evaporation. Therefore, it has the main features of high heat transfer efficiency and short heating time. Such as the configuration of the hot-pressure pump, more energy saving, low steam consumption, cooling water circulation and other advantages.
2, the material along the inner wall of the accelerating pressure flow down evaporation, to adapt to the viscosity of the liquid evaporation concentration.
3. Because the material evaporates in the form of a film in each tube, the heating time of the material liquid is very short, so it is very favorable to the evaporation and concentration of food, and the nutrients of the food are largely preserved.
4. Under the action of vacuum, the evaporation process not only ensures the sanitary requirements of the materials, but also guarantees the environmental protection requirements. At the same time, the evaporation temperature is greatly reduced. With the configuration of the heat pump, part of the secondary steam is re-inhaled by the heat pump. The steam mixing saves steam generation. At the same time, the steam passing through the hot-pump is sprayed into the heating shell, the steam rapidly spreads, and the feed liquid is heated mildly, so it is suitable for the concentration of heat-sensitive materials.
5. The equipment is suitable for the evaporation and concentration of foaming materials. Because the material liquid evaporates in the form of film in the heating tube, it forms vapor-liquid separation. At the same time, at the bottom of the effector, most of the material liquid is pumped away, only a small amount of material is removed. The liquid and all the secondary steam enter the separator to strengthen the separation. The liquid process does not form too much impact, avoiding the formation of foam.
6. For food evaporation and concentration, the equipment can have sterilizing function at the same time. The material is preheated first and then enters the sterilizer. It reaches 94 degrees or more and maintains for about 24 seconds. It enters an effector and the material rapidly flashes and the temperature drops instantly. .
7, the equipment can be equipped with CIP cleaning system, to achieve on-site cleaning, the entire set of equipment is easy to operate, no dead ends.
8, the device continuously into the material.
9. The equipment can be equipped with automatic system to realize automatic control of feed quantity, automatic control of heating temperature, automatic control of discharge concentration, automatic control of cleaning, and protection measures against sudden power failure and sensitive materials during failure. Other safety, alarm and other automated operations, control.
Editor's summary: The function of the falling film evaporator and the characteristics of the falling film evaporator are introduced here. I hope to be helpful to everyone. If you want to know more related information, you can pay attention to this website information.
Product category
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