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Small air separation units water circulation system problem prevention

Small air separation units water circulation system problem prevention
Mar 28, 2022
Author: DEAR AST

Sediment deposition

  1. Determine whether the system has sediment deposition: circulating water turbidity for a long time (3 months) high (greater than 20NTU), heat exchanger tend to temperature rise significantly (longer than 1 ℃ / month)
  2. Treatment method: chemical cleaning, with hydrochloric acid with hydrofluoric acid (sediment temperature increases will have thermal scale precipitation).

Biological slime

  1. Determine whether there is biological slime deposition: cool water tower has a large number of bacteria and algae, heat exchanger tend to rise significantly in temperature (longer than 1 ℃ / month)
  2. Processing program: add biocide, dispersant, defoamer. A comprehensive cleaning and stripping of the system.

Bacterial algae multiplication

  1. Judgment method: cool water tower wall, there are obvious bacteria and algae reproduction: 
  2. Treatment solution: add biocide, dispersant, defoamer, and carry out a comprehensive cleaning and stripping of the system.

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When the amount of processing air is reduced, the rising steam and reflux liquid in the upper column will be reduced, but the reflux ratio will not change. Therefore, the reduction of processing air in a small range will not affect the purity of oxygen and nitrogen, and the reduction of processing air volume will help to reduce the pressure of the upper and lower columns. However, according to the material balance, the production of oxygen and nitrogen will naturally decrease when the amount of processing air is reduced. If the amount of processing air is too small, there will be leakage on the tray. If the heat and mass exchange of the leaked liquid is not sufficient, the purity of oxygen and nitrogen will be greatly affected, and even the normal production can not be realized. Therefore, the minimum allowable load of distillation column is generally specified.
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