Requirements for circulating water quality in air separation
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Our company has newly installed a 6000 capacity air separation unit that uses the circulating water from the company’s existing system; the hardness of this water is around 15, and its turbidity is around 30. Will the plate heat exchangers in the air separation unit get clogged? Could some expert give me some advice? This post was last edited by chc1125 on 2008-11-12 15:01.]
The turbidity of your water is too high; it’s possible that sludge is gradually accumulating in certain areas, which could lead to blockages over time. You haven’t specified the levels of calcium and other substances, which makes it difficult to conduct a thorough analysis. I’m not sure whether the water is prone to scaling. Also, does the heat exchanger used for cooling the water before it enters the air separation unit consist of plate-type heat exchangers? This post was last edited by super1 on 2008-1-28 13:42]
The turbidity of your circulating water is too high, which can lead to a series of problems such as scaling on the fillers in air-cooled and water-cooled towers, increased operating resistance, and poor cooling efficiency.
The hardness is very low; is it close to soft water? Is it a soft water system? The turbidity is more or less the same, but it’s still necessary to adjust it to around 10-20. In air separation units, the plate heat exchangers are not used for water flow; rather, they are used for the flow of product gas and process gas. Therefore, I think the term \"enclose\" is problematic in this context! However, if the cooling water is passed through a plate heat exchanger, the requirements are likely to be higher, with lower turbidity levels required. As far as I know, there are no cases where cooling water is used in plate heat exchangers. For ordinary water, the quality control parameters are as follows: calcium hardness: 200–400 ppm; magnesium hardness: 200–400 ppm; pH: 7.5–8.2; concentration ratio: 3–5 (depending on the chemicals used in the cooling water); conductivity: 1800–2000. But for soft water, it depends on the parameters specified by the chemicals used for treating the cooling water. I hope this helps!
Generally, the circulating water for air separation systems is separate; it must not share a circulating water system with the urea production process. The heat exchangers used in air separation systems are not of high quality. In the company in question, the hardness and turbidity of the circulating water were high, so it was necessary to clean the tanks and adjust the water quality by adding chemicals
I have some indicators for the circulating water used in air separation here; do you think they might be useful? If it’s useful, please give your support! :Lol. Appearance: Clear. Turbidity (NTU): <15. pH value: 8–9. Conductivity (us/cm): <2000. Total hardness (mg/L): 150–400. Total alkalinity (mg/L): 150–350. Calcium ions (mg/L): 80–300. Total phosphates (mg/L): 5–7. Cl- (mg/L): <100. Concentration ratio: 2.5–3.0