1. Working principle:

Forced circulation evaporators are used to avoid scaling or crystallization of products that boil on heated surfaces.To do this, the flow rate in the tube must be high.The circulating liquid is heated as it passes through the heat exchanger, and then partially evaporates as the separator pressure drops, cooling the liquid to its boiling point at the right pressure.Because of the circulating pump, the operation of the evaporator has little to do with the temperature difference. The recycling speed of materials can be precisely adjusted. Evaporation rate is set in a certain range. In crystallization applications, crystals can be separated from circulating crystal mud by adjusting the circulating flow rate and using special separator designs.The equipment adopts pump forced circulation, with high evaporation rate and significant concentration ratio, especially suitable for the evaporation of materials with high concentration or viscosity; Forced circulation evaporator is one kind of evaporating equipment.The circulation of solution in the equipment mainly depends on the forced flow generated by the external power. The cycle speed is generally 1.5-3.5 m/s. High heat transfer efficiency and production capacity. The feed fluid is pumped from bottom to top by the circulating pump and flows upward along the tube of the heating chamber. Steam and liquid foam mixture into the evaporation chamber after separation, steam from the upper discharge, fluid blocked falling, conical bottom by the circulation pump, then into the heating tube, continue to circulate.

2.Advantages of forced cycles:
Multi-effect forced circulation evaporation system has the following advantages:
Large heat transfer coefficient, salt-out resistance, scale resistance, strong adaptability, easy to clean;
The circulation of solution in the equipment mainly depends on the forced flow generated by external power, and the circulation speed is generally up to 1.5-3.5 m/s, with high heat transfer efficiency and production capacity.

2.1.Smooth operation, through PLC, industrial computer (FA), configuration and other forms to control the system temperature, pressure, motor speed, maintain the system evaporation balance, achieve automatic operation.

2.2.The material does not evaporate in the heat exchanger and flash in the separator. The steam is discharged from the upper part of the separator, and the fluid is blocked and falls. The conical bottom is inhaled by the circulation pump, and then enters the heating tube, and continues to circulate. This method can achieve very good results of vapor-liquid separation.

2.3.The material is concentrated by low-temperature evaporation of vacuum type, and the heating and evaporation time is short with continuous feeding and discharging.

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