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The climbing film evaporator is suitable for the solution with large evaporation capacity (i.e. dilute solution), heat sensitivity and easy foaming, but not suitable for the solution with high viscosity, crystal precipitation or easy scaling. 4 Horizontal evaporator It is basically similar to the structure of the horizontal shell and tube condenser. According to the way of liquid supply,hemp extraction centrifuge, it can be divided into shell and tube evaporator and dry evaporator. Horizontal shell and tube evaporators are widely used in closed saline circulation systems. Performance characteristics: Compact structure, good contact between liquid and heat transfer surface, high heat transfer coefficient. However, it needs to be filled with a large amount of refrigerant, and the liquid column will have a certain impact on the evaporation temperature. And when the concentration of the saline is reduced or the brine pump is shut down for some reason, the saline may be frozen in the pipe. If the refrigerant is Freon, it is difficult for the lubricating oil dissolved in the Freon to return to the compressor. In addition, it is necessary to stop working during cleaning. 5 Vertical tube type cold water tank evaporator 6 Spiral tube evaporator The common point of vertical tube and spiral tube evaporators is that the refrigerant evaporates in the tubes, and the whole evaporator tube group is immersed in the box (or pool, tank) filled with secondary refrigerant. In order to ensure that the secondary refrigerant circulates in the box at a certain speed, a longitudinal partition is welded in the box and a spiral stirrer is installed. The coolant flow rate is generally 0.3 ~ 0.7 m/s to enhance heat transfer. Performance characteristics: Vertical tube and spiral tube evaporators can only be used in open cycle systems, so the secondary refrigerant must be non-volatile substances, such as saline and water. If saline is used, the evaporator tubes are easily oxidized, and the saline is easy to absorb moisture and reduce the concentration. These two evaporators can directly observe the flow of secondary refrigerant and are widely used in saline refrigeration system with ammonia as refrigerant. 7 Cooling tube bank A cooling calandria is an evaporator used to cool the air. It is widely used in low temperature cold storage. The refrigerant flows and evaporates in the cooling tube,jacketed glass reactor, and the cooled air outside the tube as the heat transfer medium makes natural convection. Performance characteristics:During operation, the solution descends along the annulus and ascends along the heating tube, forming a natural circulation. Generally, wiped film evaporator ,rotary vacuum evaporator, the cross-sectional area of the annular gap is about 100-150% of the total area of the heating tube, so the solution circulation rate is relatively high (about 1-1.5m/s). Since the boiling liquid is in contact with the evaporator shell at a lower temperature, there is less heat loss. Performance characteristics: I also hope to know more like-minded friends through this platform, communicate with each other, learn from each other, make progress together, and make a contribution to the cause of green environmental protection! (Disclaimer: This article only represents the views of the author,cbd centrifugal extractor, and does not represent the position of this public account. If there are intellectual property disputes, contributions and cooperation matters, please contact) Return to Sohu to see more Responsible Editor:. toptiontech.com