Scaling tube heat exchanger
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Under the same conditions, it is said that scale-trimmed tube heat exchangers have low resistance, but in my case, the resistance in the shell side is above 2.0 KPa when the sulfuric acid is changed, and it is also above 2.0 KPa when the tubes are changed every three or five times; the resistance in the shell side is as well above 2.0 KPa. The output has not yet reached the design standards. Why is this? What is it usually?
Page 56 of Qian Songwen’s \"Heat Exchanger Design Manual\" states that when the pressure of the process stream is between 0.1 and 0.17 MPa, the allowable pressure drop is around 0.004 to 0.034 MPa； When the pressure of the process stream is greater than 0.17 MPa, a pressure drop of 0.034 MPa or more is allowed.