Air compressor air cooling issues
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The air compressor in our 25,000 cubic meter air separation unit is a 3-stage compressor (MCO1004), but it has only two stages of air cooling, the first and second stages. Generally, the temperature of the gas after compression reaches over 100 degrees; so why is no air cooling required for the final stage? Are there ordinary air compressors? Please give some advice
Theoretically, isothermal compression has the highest compression efficiency; therefore, an inter-stage cooler is installed in the compressor, while no cooler is placed at the outlet of the air compressor. The reason for this is not that the temperature after the final stage of compression is low, but rather because the air separation system is equipped with a pre-cooling system.
Whether final cooling is required is determined by the process flow; an air-cooling tower is fully capable of meeting the cooling requirements, so there is no need for additional final cooling.
Generally, the final stage of small air separation units is equipped with a cooler, and thus no air pre-cooling system is required. In large air separation units, the volume of air handled is high, and the cooling effect of the final stage cooler is not optimal, which places a heavy load on the molecular sieve.
The air-cooled tower acts as the final cooler for the air compressor, serving to reduce temperature and remove impurities. In fact, this cooler has the highest cooling capacity and the greatest range of adjustment.
I believe it is also necessary to install an end-cooler in large air separation units, as the inlet temperature of the air pre-cooling system is too high, which results in a heavy load on the pre-cooling system. The cooling efficiency has its limits, and even after two stages of cooling in the air cooling towers, it may not be possible to consistently achieve the temperature required for the air entering the molecular sieve. Therefore, with the addition of a final cooler, the regulatory flexibility of the pre-cooling system increases, and the reliability of maintaining the outlet gas at specified standards is enhanced, which is advantageous. At the same time, it is also beneficial for controlling the water freezing consumption of the pre-cooling system. . .
I’ve learned it. Not bad; please take good care of me all of you
Whether a cooler is needed for the final stage depends on whether it can meet the production requirements. Generally, compressors require coolers to achieve isothermal compression between stages, but such coolers are not necessarily necessary for the final stage; a pre-cooling system can also be considered as a cooler for the final stage.
In simple terms, the pre-cooling system of the air separation system acts as the final cooler
We have this here: after compression by the air compressor, there is a aftercooler at the outlet to cool the compressed air, so that the temperature of the gas at the outlet remains below 40 degrees
The last edit to this post was made by Chūrù on 2011-7-29 at 11:13. The final cooler is found in units from older models; most modern units no longer have it. Whether a final cooler is necessary depends on the performance of the nitrogen-water pre-cooling system. For example, in devices that do not have refrigerators, it is necessary to consider installing a final cooler. Intermediate coolers are designed primarily to ensure isothermal compression of the equipment, and the advantage of isothermal compression is that it reduces energy consumption and improves compression efficiency