Freeze dryer and adsorption dryer difference


The freeze dryer is to freeze the water-containing substance into a solid state, and then sublimate the solid water into a gas state, so as to remove the water and preserve the substance. In the compressed air drying process, its freeze-drying is to reduce the temperature of the compressed air, so that the water in the compressed air is separated.

The working principle of the refrigerated dryer is to use the refrigerant to cool the compressed air to a certain dew point, separate the supersaturated water, and separate the liquid water through the steam separator to achieve the purpose of drying, but the dew point value of the outlet pressure of the equipment can not reach the temperature below the freezing point of the water. Its remarkable feature is that it can work continuously, without regeneration, and with low energy consumption.

The adsorption dryer uses silica gel, activated alumina, molecular sieve and other adsorbents to absorb the water in the compressed air to achieve the purpose of drying. This method makes it easy to treat the pressure dew point of compressed air to a temperature below the freezing point of water. However, due to the limited adsorption capacity of the adsorbent itself, the method of alternating adsorption of two or more towers must be used, and the drying of compressed air should be carried out continuously. There are many kinds of dryers on the market, but they all use the principle of adsorption dehydration. The difference lies in the way it is regenerated.

The difference between freeze dryers and adsorption dryers is not only the principle of this piece, but also performance, operating costs, maintenance costs, acquisition costs, etc., if you want to know more details, please see below.

One: Performance difference

The energy consumption and operating cost of the frozen dryer is lower than that of the adsorption dryer, and its pressure dew point is usually above 3 ° C, which is sufficient for the general manufacturing process. For some more demanding and drier compressed gases, adsorption dryers can be selected.

Two: Operating cost difference

The dew point values of the compressed air processed by the two devices are different and cannot be easily replaced, so the operating costs are not comparable. The difference between them is more in the comparison between the same type of equipment, such as the selection of different types of heat exchangers, different refrigerants and so on

Three: maintenance costs

Freeze-dryers use sealed refrigeration systems where refrigerants are not exposed to the atmosphere, so system maintenance costs are low.

The adsorption dryer involves frequent valve switching between the adsorption tower, and the thermal regeneration dryer also has high and low temperature switching, so the maintenance cost of the valve is relatively high. In addition, the adsorption dryer needs to replace the adsorbent regularly, resulting in higher maintenance costs.

Four: Acquisition costs

From the current sales price on the market, in the same brand of products, the price of adsorption dryers with the same processing volume will be higher than the price of frozen dryers.




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