-60°制冷机组 零下低温覆叠医药设备

-80℃ super-low temperature duplicated refrigeration unit 60

Specific application fields of cryogenic units:

1, pharmaceutical: synthesis, hydrolysis, esterification,etherification and other need temperature control process.

2, chemical industry: distillation and purification, rubbergrinding, low temperature grinding.

3, metal treatment: low temperature assembly, low temperaturewith fire.

4, food: tuna and other ultra-low temperature food processingand storage.

5, electronics: parts environmental test.

6. Aerospace: heat sink test, parts environment simulationtest.

7, environmental protection: waste gas condensation recovery,net emissions.

The advantages of cryogenic cascade refrigerators (cascaderefrigerators) over liquid nitrogen:

1. The cost of using liquid nitrogen is 7-10 times that of usingultra-low temperature overlapping refrigerating unit;

(The heat of vaporization of liquid nitrogen is 5.6kJ/mol=200kJ, the refrigeration power is 1kW. H, and 18KG=22 litresof liquid nitrogen is needed).

2, low temperature refrigeration unit can accurately control thetemperature, and liquid nitrogen temperature control is moredifficult.

3. The transportation and storage of liquid nitrogen is verycomplicated, and the production will be stopped once it isinterrupted.

4, the use of liquid nitrogen has a certain degree of danger,need to use a license.

Features of stacked cryogenic unit:

When the stacked cryogenic unit is used in pharmaceutical,chemical, aerospace heat sink experiment and other industries, arefrigerant carrying circulation system is usually needed betweenthe ultra-low temperature refrigerator and the user's load reactiontank.

The main reasons are:

1. The load volume of general users is large. If the loadtemperature needs to be uniform, it must be filled withrefrigerant, but at room temperature, a large number oflow-temperature refrigerant will become gas.

2. The load of the user site is far away from the refrigerationroom. The load area is usually clean, explosion-proof and silentarea.

3. Usually the cooling capacity is cooled by the heat exchangecoil in the load of the material. Once the heat exchange coilleaks, it may pollute the material, and the refrigerant system isusually used with the material solvent, so even if the leakage cancompletely avoid the possibility of pollution.

4. The refrigerant of stacked refrigerating unit is also acarrier of cold storage. When the load changes greatly, therefrigerant can be adjusted through the refrigerant.

This is conducive to control and energy saving.

Generally speaking, the greater the load fluctuation, the morethe quantity of refrigerant.

5, the heat transfer efficiency is higher than liquidnitrogen.

Liquid nitrogen uses latent heat of evaporation to release coldcapacity. Liquid nitrogen becomes a gaseous state after heatabsorption. There is a state of vapor-liquid two-phase mixing inthe coil tube, which produces a large gas resistance and a sharpdecrease in flow rate.

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