What are the effects and hazards of too low air temperature before entering the molecular sieve?
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What are the effects and hazards of too low air temperature before entering the molecular sieve?
The standard should be no lower than 8-10 degrees; a too low value indicates that the water is being separated cleanly in the air-cooled tower, and in such cases the chiller shuts down automatically as a protection measure
Too low water temperature can also cause scaling; 8-10 degrees is the optimal temperature
Generally, a low temperature of the air entering the molecular sieve is not harmful. However, to keep the air temperature low, the temperature of the chilled water must also be low; therefore, as long as it is ensured that the chilled water does not freeze, the air temperature will remain low.
1. There is an optimal range for the adsorption temperature of molecular sieves; it should not be too high or too low, which is why there are specific temperature requirements for air cooling towers. 2. Operating at too low a temperature results in excessive energy consumption, which is not cost-effective.
This post was last edited by Chūrù on 2012-2-5 at 12:59. Other than increasing low energy consumption, there doesn’t seem to be any downside to lower temperatures. What do you say is the optimal temperature for molecular sieves? I remember that the description in the book was that low temperatures are beneficial for the removal efficiency of molecular sieves
Although low temperatures are favorable for molecular sieve adsorption, it increases the load on the pre-cooling system. Low temperatures do not appear out of nowhere; the pressure at the outlet of air compressors is generally above 100°C. The higher the temperature, the greater the energy consumption, and the higher the requirements for the tower as well.
I agree with what was said above: the lower the temperature, the greater the energy consumption.
Reply to 7# hxm2087: This applies to water-cooled equipment that uses chillers and ammonia coolers. There is an increase in energy consumption. But some units, due to an adequate supply of dirty nitrogen and nitrogen, do not have these devices; even without going to the water cooling tower, they still vent. So it doesn’t matter.
We use contaminated nitrogen gas and nitrogen-based cooling water, so the temperature is relatively low; sometimes the air temperature here doesn’t even reach 8 degrees
It’s the air temperature entering the purifier. In other words, there is an optimal temperature range of 8–15°C for the molecular sieve in the purifier to carry out its adsorption function; it’s better to operate within this range. However, due to pressure factors, the range might vary slightly, but that’s not a problem. Generally, setting it within this range is sufficient. In practice, it turns out that this range can usually be easily met, and that’s good enough.