Introduction 

   The forced circulation evaporator uses external power to circulate. A pump is used to force the solution to pass through the heating tube at a speed of 2-5m/s in one direction. Other evaporators are all natural circulation evaporators because of the density difference between the solution in the heating chamber and the circulation pipe. Their common shortcomings are that the circulation speed of the solution is low and the heat transfer effect is poor. A forced circulation evaporator can be used when handling solutions with high viscosity, easy fouling or easy crystallization.

working principle

         A type of evaporation equipment. The circulation of the solution in the equipment mainly depends on the forced flow generated by the external power. The circulation speed is generally up to 1.5-3.5 m/s. The heat transfer efficiency and production capacity are relatively large. The raw material liquid is pumped in from bottom to top by the circulating pump, and flows upward along the tube of the heating chamber. The mixture of steam and liquid foam enters the evaporation chamber and separates. The steam is discharged from the upper part, and the fluid is blocked from falling, and is sucked by the circulating pump through the conical bottom, and then enters the heating pipe to continue the circulation.

Features 

  1.Advantages: large heat transfer coefficient, anti-salt precipitation, anti-scaling, strong adaptability, easy to clean.

  2.Disadvantages: large consumption of kinetic energy, long solution residence time; slightly higher cost and maintenance cost.

scope of application 

Forced circulation evaporator, suitable for evaporation and concentration in industries such as scale formation, crystallinity, heat sensitivity (low temperature), high concentration, high viscosity and insoluble solids, such as chemical, food, pharmaceutical, environmental protection engineering, waste liquid evaporation and recovery .

maintenance

        The lubricating oil of the generator reducer is 40# engine oil, and the refueling amount should be within the indicated height. Too much oil will cause stirring and heat generation, and too little oil will damage the oil film of the eccentric shaft pump and heat up and cause the temperature to rise.

        1) Replace the secondary lubricating oil within 1 month at the beginning of use, and replace the lubricating oil once within 3-4 months.

        2) After opening the lower head, unscrew the bolts at the bottom of the U-shaped groove of the rotor, and check the scraper every four months to replace the scraper.

        3) Open the bottom bearing every two months, check the wear of the bottom bearing, and replace the bottom bearing if necessary.

        4) According to the nature of the material, the inner cylinder should be soaked and cleaned regularly with warm water or solvent.

        5) Add sealing liquid to the mechanical seal cavity once a month, the sealing liquid is 20# mechanical oil.

Features are:

  ① The amount of evaporated water can reach 0.5t/h~100t/h

  ② During normal operation, the system only uses electricity, the energy consumption per ton of water evaporated is 15KW.h to 100KW.h, and the operating cost is 1/8~1/2 of the multi-effect evaporation.

  ③ It is currently the most energy-saving evaporator, mostly single-effect evaporation, small heating temperature difference, short residence time, suitable for heat-sensitive materials.

  ④ Compact structure and small floor space.

  ⑤ The equipment realizes automatic operation through PLC control, and can operate continuously and stably for a long time.

The conical thin-film evaporator relies on a centrifugal force applied by the rotor to the material. This centrifugal force has two effective forces, one perpendicular to the heating surface and the other towards the direction of the large diameter end body (note: the same result also appears in the vertical cone type In the thin-film evaporator, the materials are accelerated by these forces, and the incoming materials ensure that the heating surface is fully moist, and does not depend on the evaporation ratio or the feed rate. Therefore, local material overheating and thermal degradation are reduced or completely eliminated.

In this process, the light components (low boilers) flow downstream (in the same direction as the liquid film) through the horizontal thin-film evaporator and enter the vapor-liquid separator, where the liquid droplets and bubbles produced by the vapor-liquid separation are It is crushed into the liquid phase (high boiler), and the separated vapor enters the external condenser or the next process; the recombined component (high boiler) climbs along the heating wall to the small end outlet and is discharged.