The falling film evaporator is suitable for evaporation and concentration of foaming materials. Because the liquid liquid evaporates in the heating tube, it forms vapor-liquid separation. At the bottom of the effect body, most of the liquid is pumped away, only a small part. The feed liquid and all the secondary steam enter the separator to strengthen the separation, and the liquid preparation process does not form too much impact, avoiding the formation of foam.
Since the solution flows in a single-pass type evaporator, the heat transfer coefficient is high, the residence time is short, and the material is not easily deteriorated. It is suitable for processing heat sensitive materials, and the liquid retention is small, which can be based on energy supply, vacuum degree, and feed amount. The rapid operation of the change in concentration, etc., because the process fluid flows only under the action of gravity, rather than by the high temperature difference, low temperature difference evaporation can be used. The feed liquid is added from the top of the evaporator, and descends along the wall of the tube under the action of gravity, and is concentrated by evaporation in the process, and a concentrate is obtained at the bottom. The falling film evaporator can evaporate materials with higher concentration and higher viscosity.
The generated steam and the liquid phase enter the separation chamber of the evaporator, the vapor and liquid are fully separated, the steam enters the
Condenser to condense or enters the next
falling film evaporator as a heating medium, thereby achieving multi-effect operation, and the liquid phase is separated by the separation chamber. discharge. In the single-effect single-stage production, the single-effect production time is short, the speed is fast, and the operation is simple. When the energy is used effectively, the vacuum temperature is concentrated when the temperature of the extract is about 90 degrees, and the boiling point temperature is 60 degrees at -0.08Mpa. Single-effect, full play of the advantages of single-effect can alleviate the urgent need of production. The large area of the cooler can be used for single-unit or combined-concentration single-stage production. Simultaneous production of two units is single-effect production, if the solvent is recovered. The plate buffer tank in the vacuum protection system is operated.
August 12, 2022
