A type of tube and shell heat exchanger is a petrochemical equipment. It consists of main components such as tube box, casing and tube bundle. The U-shaped tube heat exchanger has only one tube sheet, and both ends of the tube are fixed on the same tube sheet.
The characteristics of this type of heat exchanger are that the tube bundle can be freely expanded and contracted, and no thermal stress will be generated due to the temperature difference between the shell and the tube. The thermal compensation performance is good; ; Strong pressure-bearing capacity; The tube bundle can be pulled out of the casing for easy maintenance and cleaning, and has a simple structure and low cost. But it is inconvenient to clean the tube
The tube in the middle part of the tube bundle is difficult to replace, and the bending radius of the innermost tube cannot be too small. The tube distribution in the center of the tube sheet is not compact, so the number of tubes cannot be too large, and there is a gap in the center of the tube bundle, which makes shellside fluid easy Short circuit affects shell-side heat transfer. In addition, in order to compensate for the thinning of the pipe wall after the bend, a thicker pipe is needed for the straight pipe part. This affects its use occasions, and should only be used in cases where the temperature difference between the shell and the wall is large, or the medium on the shell side is prone to fouling, while the medium on the pipe side is clean and difficult to foul, high temperature, high pressure, and corrosive conditions.
The types and basic parameters of this type of heat exchanger have been serialized, JB / T4717-92, and Sinopec's "Floating head heat exchanger, condenser U-tube heat exchanger series-Types and parameters" (third edition) 2006.8 , Design and manufacturing should follow GB151-1999 "shell and tube heat exchanger" and other standards.