Deep drying of compressed air
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If compressed air is not thoroughly dried in winter, water may remain in the compressed air pipelines; if this water freezes, it can prevent the control valves from functioning. Therefore, thorough drying is necessary. Methods for thorough drying include the use of cold dryers and heatless regenerative dryers – which one is better?
This is first determined based on one’s own manufacturing processes; in principle, cold drying is the better choice as it removes water more thoroughly.
Regarding your question, first consider your process requirements (generally, for the compressed instrument air used by you, the dew point should be below -25 degrees). Next, think about the compatibility of the equipment – whether it is feasible to install any additional equipment (this is related to the selection process). Lastly, take economic considerations into account. So you have more criteria to determine which device to use.
It is better to consider using a cold dryer; our instrument air supply relies on such a device, which provides excellent drying performance with low power consumption.
Our unit uses adsorption dryers
Our unit uses a cold dryer.
It is recommended to check the website of Xi’an Ultrafiltration Company (I’m not an agent); Li Daming and his team do excellent work, and there are relevant technical papers available for reference.
It’s better to use a cold dryer. It is normal to use dried air as instrument air, especially in coastal areas with high humidity.
According to your process requirements, the dew point of a refrigerated dryer generally reaches 2–5 degrees (lowest pressure dew point), while an adsorption dryer can achieve temperatures of -40 to -100 degrees. It is recommended to use an adsorption dryer. This post was last edited by charles006 on 2008-5-7 at 15:53
For making compressed air buffer tanks, there are generally 3 methods for dealing with the bottom of the tank. 1. Install an air drain valve to remove moisture from within the buffer tank. 2. Use a threaded fitting and keep the valve slightly open, maintaining a minimal degree of opening. Under conditions of -20 degrees in the north, this approach usually doesn’t present any problems. Based on 5 years of experience, this method is quite safe and reliable. Of course, using a cold dryer is another option; it just requires a higher investment.
We first perform cold drying, and then adsorption. Because in the north, where temperatures drop to minus 10 degrees in winter, cold dryers cease to function; adsorption dryers are necessary in such cases. It mainly depends on your location – cold dryers are more suitable for areas where it doesn’t freeze in winter.