The difference between refrigerated dryer and adsorption dryer
1. working principle
The cold dryer is based on the principle of freezing and dehumidification. The saturated compressed air from the upstream is cooled to a certain dew point temperature through heat exchange with the refrigerant, and a large amount of liquid water is condensed at the same time, and then separated by the gas-liquid separator. In addition, to achieve the effect of water removal and drying; the desiccant dryer is based on the principle of pressure swing adsorption, so that the saturated compressed air from the upstream is in contact with the desiccant under a certain pressure, and most of the moisture is absorbed in the desiccant. The dried air enters the downstream work to achieve deep drying.
2. Water removal effect
The cold dryer is limited by its own principle. If the temperature is too low, the machine will cause ice blockage, so the dew point temperature of the machine is usually kept at 2~10°C; Deep drying, the outlet dew point temperature can reach below -20°C.
3. energy loss
The cold dryer achieves the purpose of cooling through refrigerant compression, so it needs to be adapted to a higher power supply; the suction dryer only needs to control the valve through the electric control box, and the power supply power is lower than that of the cold dryer, and the power loss is also less.
The cold dryer has three major systems: refrigerant, air, and electrical. The system components are relatively complex, and the probability of failure is greater; the suction dryer may fail only when the valve moves frequently. Therefore, under normal circumstances, the failure rate of the cold dryer is higher than that of the suction dryer.
4. Gas loss
The cold dryer removes water by changing the temperature, and the moisture generated during operation is discharged through the automatic drain, so there is no loss of air volume; during the operation of the drying machine, the desiccant placed in the machine needs to be regenerated after it absorbs water and is saturated. About 12-15% of the regenerative gas loss.
What are the advantages and disadvantages of refrigerated dryers?
advantages
1. No compressed air consumption
Most users do not have very high requirements on the dew point of compressed air. Compared with the suction dryer, the use of the cold dryer saves energy
2. Simpler daily maintenance
No wear of valve parts, just clean the automatic drain filter on time
3. Low running noise
In the air-compressed room, the running noise of the cold dryer is generally not heard
4. The content of solid impurities in the exhaust gas of the cold dryer is less
In the air-compressed room, the running noise of the cold dryer is generally not heard
disadvantages
The effective air supply volume of the cold dryer can reach 100%, but due to the restriction of the working principle, the dew point of the air supply can only reach about 3°C; every time the intake air temperature increases by 5°C, the refrigeration efficiency will drop by 30%. The air dew point will also increase significantly, which is greatly affected by the ambient temperature.
What are the advantages and disadvantages of the adsorption dryer?
advantages
1. Compressed air dew point can reach -70°C
2. Not affected by ambient temperature
3. Filtration effect and filtering impurities
disadvantages
1. With compressed air consumption, it is easier to consume energy than a cold dryer
2. It is necessary to add and replace the adsorbent regularly; Valve parts are worn out and require routine maintenance
3. The dehydrator has the noise of depressurization of the adsorption tower, The running noise is around 65 decibels
The above is the difference between the cold dryer and the suction dryer and their respective advantages and disadvantages. Users can weigh the pros and cons according to the quality of the compressed gas and the cost of use, and equip a dryer corresponding to the air compressor.