The water cooling tower of an air separation plant is a hybrid heat exchanger. The cooling water with higher temperature (around 35 ℃) from the air cooling tower flows downwards from the top spray, while the dirty nitrogen with lower temperature (around 27 ℃ -) from the switching heat exchanger flows from bottom to top. The two come into direct contact, which not only transfers heat and mass, but also is a relatively complex heat transfer process.
On the one hand, due to the temperature of water being higher than the temperature of polluted nitrogen, heat is directly transferred from the water to the polluted nitrogen, allowing the water to be cooled; On the other hand, due to the relatively dry nature of polluted nitrogen, with a relative humidity of only about 30%, water molecules can continuously evaporate and diffuse into the polluted nitrogen. Water evaporation requires the absorption of latent heat of vaporization, which takes away heat from the water, causing the temperature of the water to continuously decrease. It must be pointed out that the moisture absorption of sewage nitrogen is the main factor in cooling water, so the relative humidity of sewage nitrogen is the key to affecting the cooling effect. This is also why it is possible for the outlet temperature of cooling water to be lower than the inlet temperature of polluted nitrogen.
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