What value is appropriate for the K factor of a graphite falling film absorption unit?
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When using a graphite falling-film absorption unit to absorb ammonia exhaust gas (absorption is carried out with dilute acid), what value is generally suitable for the K factor? Have any of you who have done the calculations tried using K=500 Kcal/(m2•h•K)? I’m not sure if this value is too high
500 is reliable; I have tested the falling film absorption devices used in the chlor-alkali industry for producing salts and acids, and the manufacturer specifies a value of 600, while the actual value ranges between 600 and 1000. . Of course, since the operating conditions of the plant in question are somewhat different from those involved in salt and acid absorption, if the process conditions are similar, 500 should be sufficient. It might be a bit low; a more conservative value would be appropriate. You could even go even further and use 400. I learned this from one of the project owners – the chief engineer for that project requested a value of 400, even though the design suggested 600. I refused, but he insisted, asking for the reason behind my refusal ? He glared and said, “Damn it! You can’t stop me from leaving room for future expansion!” Since we were already very familiar with each other, I just went along with him. ;P