Common troubleshooting of Freeze Dry Machine:

1, the failure of the Freeze Dry Machine condition

Pay special attention to air filters and hoses when inspecting Freeze Dry Machine. A blocked filter or flattened hose will reduce airflow and affect the operation of the Freeze Dry Machine; a damaged filter will contaminate the desiccant and inhibit its ability to absorb moisture; a broken hose may introduce humid ambient air into the drying In the airflow, the desiccant absorbs moisture and high dew point prematurely; hoses and drying silos with poor insulation measures also affect the drying temperature.

2, failure of dry gas path

In the drying gas path, the drying temperature should be detected at the entrance of the silo to compensate the heat loss of the Freeze Dry Machine in the hose. The low air temperature at the silo inlet may be due to improper adjustment of the controller and lack of insulation, or a malfunction of the heater element, heater contactor, thermocouple or controller.

In addition, it is also important to monitor the drying temperature throughout the drying process and observe temperature fluctuations when the desiccant is replaced.

If the material is not properly dried after coming out of the Freeze Dry Machine, check whether there is enough space in the drying silo to provide sufficient and effective drying time. Effective drying time refers to the time that the particles are actually exposed to the appropriate drying temperature and dew point. If the residence time of the particles in the silo is not sufficient, proper drying will not be achieved. Therefore, attention should be paid to the size and shape of the pellets or crushed materials, which will affect the bulk density and residence time of the dried material. A twisted hose or a blocked filter can restrict airflow and affect the performance of a Freeze Dry Machine. Therefore, if the inspection of the Freeze Dry Machine does not reveal such problems, it is impossible to determine whether the air flow is sufficient. Here, there is a fast, simple, and accurate method to detect whether the airflow of the Freeze Dry Machine is sufficient, that is, to measure the vertical temperature curve of the material in the drying silo.

Insufficient heating may indicate that, for this productivity, the drying silo is too small, or that air flow is restricted due to blocked filters or damaged hoses. If the air volume is too large, problems will occur, which not only wastes energy, but also leads to high temperature of the return air, which destroys the performance of the desiccant.

Return air filter can prevent filamentous material from contaminating the desiccant and affect its moisture absorption performance. These filters must be kept clean to ensure adequate airflow.

When the dry air comes out of the top of the Freeze Dry Machine, most of the heat has been released. When the desiccant temperature is in the range of 120of ~ 150of, most Freeze Dry Machines can work efficiently. If the return air overheats the desiccant, it will reduce its ability to adsorb moisture in the dry air.

Always check the temperature of the return air of the vegetable drying equipment. When the temperature of the return air is high, it may indicate that for this productivity, the size of the Vegetable Drying Machine is too large, or the temperature of the material entering the drying silo is high, for example, pet has crystallized before drying, or only some materials (such as pet) has a higher drying temperature than normal. In order to prevent the temperature of the return air from increasing, as long as a heat exchanger is installed on the return air path, it can ensure that the desiccant can effectively remove the moisture in the dry air.