Bayonet-Tube Exchangers

Bayonet heat exchangers are modified shell and tube types. The tubes are concentric with the outer tube, being sealed closed at one end, although the shell in its entirety is not always used or needed, see Figure 10-165. A helpful article describing this type of unit is by Corsi. ... 

A useful application is for tank and vessel heating, with the heater protruding into the vessel. Bayonet heat exchangers are used in place of reactor jackets when the vessel is large and the heat transfer of a large mass of fluid through the wall would be difficult or slow, because the bayonet can have considerably more surface area than the vessel wall for transfer. Table 10-43 compares bayonet, U-tube, and fixed-tubesheet exchangers. ... 

Fig. 1. High-heat-transfer bayonet-style exchangers employing tantalum alloy tubes. Each exchanger uses 104 tubes. (Fansteel)...

The decay heat exchanger of the RRP system consists of bayonet tubes in which the outside surface is wetted by the primary fluid. The secondary water flows first in the internal tube and then upward through the annular space bound by the two tubes. The water box is located in a dead zone, behind the venturi. This type of heat exchanger was selected, since it does not require a water box at the exit of the heat exchanger. This reduces the primary pressure drop and allows free expansion of the tubes. Thermal loads are reduced leading to an increased mechanical resistance and an enhanced reliability. 

Gardner,K. A., Heat-Exchanger Tube-sheet Deslgn-3. U-Tube and Bayonet-Tube Sheets, Journal of Applied Mechanics, American Society of Mechanical Engineers, 1960. 

Heat exchangers 4 units, shell and tube heat exchanger, double-walled bayonet tube, removable... 

Figure 10-165. Typical bayonet type heat exchanger, showing the key sparger arrangement internally as a part of each tube. (Used by permission Corsi, R. Chemical Engineering Progress, V. 88, No. 7, 1992. American Institute of Chemical Engineers. All rights reserved.)...

Comparison of Bayonet, U-Tube, and Fixed Tubesheet Heat Exchangers... 

This type of exchanger gets its name from its design which is similar to a bayonet sword and its associated scabbard or sheath. The bayonet tnbe is a smaller-diameter tnbe inserted into a larger-diameter tube... 

KBI-40 Alloy is a solid solution of 60% tantalum and 40% columbium. As such, it has many application possibilities in common with both its elemental components, particularly tantalum. It is interchangeable with the higher-priced tantalum in many applications, including plate and shell-and-tube heat exchangers, reactors, condensers, bayonet heaters, thermowells, spiral coils, U-tubes, rupture discs, distillation columns, and piping. 

Type of exchanger Bayonet, U-tube in U -shell. Straight, ... 

---