①The jacket is used for column heating if the heating media is steam.
    ②The half pipe shape jacket is used for column heating, if the heating media is heat oil or high pressure steam.
    f. Rotor
    The rotor installed in evaporator inside consists of rotating shaft and support. The rotor driven by motor and speed reducer brings scraper to make circular movement. The support is made stainless steel and machined in precise dimensions to assure the strength, dimension, and stability etc. properties.
    g. Scraper
    The scraper movement makes materials form thin film continuously on evaporator surface to reach the thin film evaporation results.

According to viscosity of the materials, the following three types scrapers can be selected:
    ①Slide Scraper (see figure 2)
    Sliding scraper is a basic and normal scraper. The scrapers are installed in the four guiding grooves on the rotor. Due to the rotation centrifugal force, the scrapers circular movement force materials to move towards column inner wall in radial direction and make the materials on evaporation surface in film turbulent form. Thus, greatly increase the heat transfer coefficient and effectively avoid materials overheat, drying wall and scarring etc. problems.

The scrapers use PTFE as packing materials, it is suitable at 150℃ working temperature. If the evaporation temperature is above 150℃,carbon fiber materials will be used as packing. The scraper end surface is machined to form certain angular liquid guide groove.

②Fixed Scraper see (figure 3)
    Fixed in rotor, the scraper is made of metal materials, The gap distance between rotating scraper and the inner wall of column is only 1-2mm. It requires high fabrication and installation precision. It is suitable for high viscose and easy bubbling materials evaporation and concentration, de-solving and extraction.
    ③Hinge Scraper ( See Figure 4)

This kind of scraper is suitable for easy scaring materials on heating surface. The scraper usually is made of metal. It is fixed on the rotating frames by means of hinges. When the rotor starts rotation, because of centrifuge force, the scraper will be tightly pressed to the inner wall of evaporation column (and wall surface), sliding on the surface in certain angles to make materials into thin film and prevent from scaring on the surface. 
H. Bottom Head
    W shape bottom head with unique design, equipped with high temperature resistance, self-lubricating bearings makes materials easy discharging and bottom shaft convenient maintenance and repairing.
    3.Characteristics:
    Thin film evaporator has the following advantages, which the normal film evaporator has no way to compare with.
a. Extreme small pressure loss
    In rotation scraper thin film evaporator, the materials “stream” and second vapor “ stream” are two independent “through channel”: The materials fall down in thin film status ( force to form film ) against inner wall of evaporator column, while the second vapor evaporated from evaporation surface goes out almost without any resistance from the central space of column. Therefore, the pressure lost (or call pressure drop) is very small. So,
    b. The operation in the real vacuum status can be obtained.
    Because the second vapor resistance from surface to condensate is very small, the inner wall evaporation surface in the whole evaporation column can maintain relatively high vacuum degree (more than -750mmHg),almost equal to the vacuum degree in the exit of vacuum system. Due to maintain high vacuum degree, the boiling point of the treated material is effectively lowered.
    c. High heat transfer coefficient, high evaporation strength
    The materials boiling point decreasing greatly increases temperature difference with heat medium, the liquid film in turbulent status reduces the heat resistance, also, inhibits materials scarring on the wall surface, as a result, increase evaporation column wall sub-heat transfer coefficient. The total heat transfer coefficient of high efficient rotation thin film evaporator may reach 8000KJ/h·㎡·℃ which is very high evaporation strength.
    d. Low temperature evaporation
    Because relatively high vacuum degree is maintained in the evaporator column, the treated materials boiling point decreased greatly, it is especially suitable for the heat sensitive materials evaporation at low temperature.

 e. Short flow pass
    The flow time in the evaporator is very short. Less than 10 seconds. For normal use scraper, there is flow-guiding groove on the scraper end face, usually the slope angle is 45. To change the slope angle may change materials flow time. The material scrapped by scraper leaves evaporator sector in screw falling status. To shorter flow time will effectively prevent from products decomposing, polymerization and deterioration.
    f. Low quality steam can be used.
    Steam is commonly used heating media. Because the materials boiling point is decreased, as long as assuring the same Δt condition, the heating media temperature can be decreased. To use low quality vapor is helpful for energy multiple use, especially suitable for the end evaporator of multiple-effect evaporation.
    g. Versatile Suitability, Easy Operation
    Unique structure design makes this equipment possibly treat high viscosity, particle containing, heat sensitive and easy crystallization materials which the normal evaporator is difficult to treat with.
    The rotation thin film evaporator has wide operation range, stable working status, and easy maintenance.
    4. Products Specification

Specification Definition for GXZ High Efficiency Rotation Thin Film Evaporator:
    GXZ High Efficiency Rotation Thin Film Evaporator Dimensions and partly Technical Parameters see Figure 6 and Table 1
    Figure 1: GXZ High Efficiency Rotation Thin Film Evaporator Dimensions and partly Technical Parameters see Figure 6 and Table 1

①There are possible change for the above dimensions in actual equipment, reference only. Take the drawings dimension as actual size after signed purchase order.
    ②D indicates jacket outer diameter; Dn indicates inner diameter of evaporation column in the table.
    ③Jacket Pressure: Normally designed based on 0.4Mpa steam, also can be designed per customer requirement.
If heating oil is used, it can be designed per the requirement.
    ④The vacuum degree in the inner evaporation column : Normally designed based on -0.09Mpa(-680mmHg), also can meet clients’ requirement to reach -0.095Mpa(about -720mmHg)and -0.0986Mpa(about-750mmHg)；
    ⑤Main Column ( Materials contacting parts) and jacket materials: Per clients’ actual requirements, use SUS304、316L、316Ti、.310Sor Ti and Ni. Materials；
    ⑥Equipment Total Weight does not include materials weight.
    5. Application Industries and Operation Unit Sample
    High Efficiency Rotation Thin Film Evaporator has been widely used for Chinese and West Medicine, Agriculture Pesticide, Light Industry, Daily Chemical, Biological Chemical, Fine Chemical, Petrochemical etc. industries. Excellent results have been received. See Table (2), reference only.

 Table (2) indicates the main application industries and materials:Thin Film Evaporator can be used for materials concentration, degassing, De-solvent (solvent recovery), purification etc. chemical unit operation. The following process can be considered as reference.
    ①Materials concentration ( water evaporation) see figure (7)
    ②De-solvent or purification figure (8)
    ③As re-boiler of distillation tower (9)
    ④Combined with the tube type evaporator to form multiple effect evaporators see figure(10).
    6. The Thin Film Evaporator Selection
    The Thin Film Evaporator Selection need to consider multiple aspects elements and these elements also connect each other. General speaking, the following points need to be considered:
    ①The evaporation Surface Determination:
    ▲Evaporation volume calculation: According to the treated volume and in & out materials concentration to calculate evaporation volume per unit time.
    ▲Estimate the evaporation strength based on the materials viscosity, concentration, evaporation temperature etc.
    ▲Consider certain amount of access volume to calculate evaporation surface.
    ② Volume degree determination
    ▲To obtain vacuum degree will sacrifice energy consumptions, as long as meet the evaporation requirement, unnecessary to demand over high vacuum degree.
    ▲Vacuum degree under this evaporation temperature can be calculated according to materials heat sensitivity.
    ▲Consider certain possible leakage and the resistance in second steam stream path to determine necessary vacuum degree.     ③Scrapper type and materials determination
    ▲To select proper scrapper type is based on the materials viscosity, crystallization tendency, foam etc. physical and chemical characteristics, meanwhile consider evaporation temperature to determine proper materials.
    ④Heating Media Determination
    ▲According to required evaporation temperature and heat energy consumption, the proper heating media will be decided, possible use steam, or hot water and heating oil etc.
    ⑤Evaporator Materials Selection
    ⑥Motor Explosion Proof Property Selection and Determination
    According to our company many years practice experiences, motors with proper type and specification will be selected to help customer use.