U-type heat exchanger tube 19*2 SA179

U-tube heat exchanger

A kind of shell and tube heat exchanger, a petrochemical equipment, by the tube box, shell and tube bundle and other main components, because the heat exchange tube into the u-shaped named.The u-tube heat exchanger has only one tube plate and both ends of the tube are fixed on the same tube plate.

The special point of u-tube heat exchanger is that the tube bundle can be expanded freely

The characteristics of this kind of heat exchanger are that the tube bundle can be expanded freely, and the thermal stress will not be generated due to the temperature difference between the shell and tube, and the thermal compensation performance is good.The pipe is double-pipe, the flow is longer, the flow velocity is higher, and the heat transfer performance is better.Strong bearing capacity;The tube bundle can be extracted from the shell to facilitate maintenance and cleaning.But tube cleaning inconvenience

, the tube in the middle part of the tube bundle is difficult to replace, and because the bending radius of the innermost tube bundle should not be too small, the distribution in the center of the tube tube plate is not compact, so the number of tubes should not be too large, and there is a gap in the center part of the tube bundle, so that the shell flow is easy to short circuit and affect the heat transfer in the shell tube bundle.In addition, in order to make up for the thinning of the pipe wall after bending, the straight pipe part needs the pipe with thicker wall.This has affected its use, only suitable for the shell wall temperature difference is large, or shell process medium easy junction

Scale and pipeline medium clean and not easy to scale, high temperature, high pressure, corrosive.

This type of heat exchanger type and basic parameters have been serialized, JB/ t4717-92, and sinopec "floating head heat exchanger, condenser u-type tube heat exchanger series -- type and parameters" (third edition) 2006.8, the design and manufacture should follow the gb151-1999 "shell and tube heat exchanger" and other standards.

The following series are recommended for the length of heat exchange tubes: 1.0m, 1.5m, 2.0m, 2.5m, 3.0m, 4.5m, 6.0m, 7.5m, 9.0m, 12.0m.For a certain heat exchange area, a longer heat exchange tube is relatively economical, so the heat exchanger on the project is roughly slender structure.However, too long heat exchange tube will be detrimental to the installation and maintenance of heat exchanger.

The pipe material source is very wide, have carbon steel, stainless steel, aluminum, copper, brass and its alloy, copper nickel alloy, nickel, qin, graphite, glass and other special materials.In addition to using a single material to manufacture heat exchange tubes, in order to meet the production requirements, also often used composite tube.[