A common issue with multi-effect evaporators is the low evaporation pressure, which often causes anxiety among users upon encountering this problem, as it leads to a continued decline in the refrigeration capacity of the evaporator. What could be the reasons for the low evaporation pressure in a multi-effect evaporator?

To address the issue of low evaporation pressure in multi-effect evaporators, it is crucial to understand the causes of this fault. There are many possible reasons, and users need to conduct inspections. The following lists some common causes:

Insufficient refrigerant is a common issue. Simply add refrigerant to the multi-effect evaporator to ensure it operates normally.

2. Once refrigerant leaks, it can only be repaired; refilling the refrigerant is useless at this point, as the device containing the refrigerant will quickly become low on refrigerant again. Therefore, inspections and repairs are necessary, which is impossible for an average household.

In the event of a malfunction in the floating ball valve, it should be repaired immediately, as failure to do so will prevent the refrigerant from entering the multi-effect evaporator. Consequently, even with an adequate supply of refrigerant, it will not be able to reach the evaporator, causing the equipment to malfunction, and resulting in a drop in evaporative pressure.

The multi-effect evaporator includes an electric motor, the evaporator body, and a shaft. The motor of the multi-effect evaporator product is mounted externally to the evaporator body, with the shaft aligned along the longitudinal axis of the evaporator body. The evaporator body of the multi-effect evaporator product consists of a separator, an evaporator cylinder, and a bottom seal head, arranged sequentially from top to bottom. The inner wall of the evaporator cylinder is equipped with several scrapers, and the scraper of the product is connected to the shaft via a rotor, which is driven by the motor; a distributor is installed inside the separator, and a gas-liquid separator is positioned above the distributor. A secondary steam outlet is located on the separator corresponding to the gas-liquid separator.

The evaporator tank inner wall of the multi-effect evaporator is polished using special machine tools, with the flange connection surfaces at both ends also machined, ensuring the overall roundness of the equipment. The inner wall of the evaporating drum is smooth, clean, and bright, resistant to adhesion, effectively guaranteeing the high heat transfer coefficient of the equipment.

Steam is a commonly used heat medium. By lowering the boiling point of materials, it ensures the same temperature Δ under T conditions, which can reduce the temperature of the heating medium. Utilizing low-grade steam is beneficial for the comprehensive utilization of energy. Particularly suitable for multi-effect evaporators in multi-effect evaporation systems.

The reduction in the boiling point of the material increases the temperature difference with the heat medium; turbulent liquid film reduces thermal resistance; similarly, it suppresses the coking and scaling of the wall material, improving the partial heat transfer coefficient of the evaporator wall. The overall heat transfer coefficient of the multi-effect evaporator can reach 8000 kj/h/㎡·degree Celsius, thus achieving a high evaporation intensity.