Main Types of Shell and Tube Heat Exchangers | Complete Classification & Application Introduction

Shell and tube heat exchangers are the most widely used heat transfer equipment in marine, power, petrochemical, cement CCUS, refrigeration and food industries. According to different structural designs of tube bundles and tube sheets, they are divided into four mainstream standard types, plus special variant models for process demands. Each type has unique advantages, maintenance characteristics and applicable working conditions.

1. Fixed Tube Sheet Heat Exchanger

Structure Feature

Tube sheets at both ends of the tube bundle are fully welded and fixed to the shell flange, no movable parts. Simple integral structure, low manufacturing cost.

Advantages

• Low cost, compact overall size

• High heat transfer efficiency with counter-current layout

• Small shell-side fluid dead zone, less medium retention

Disadvantages

• Tube bundle cannot be pulled out; only tube side can be cleaned

• Not suitable for shell-side medium with heavy fouling, scaling or corrosive impurities

Typical Applications

Clean cooling water, clean lubricating oil, marine jacket water heater, boiler flue gas waste heat recovery, clean process fluid heat exchange

2. Floating Head Heat Exchanger

Structure Feature

One tube sheet is fixed, the other tube sheet (floating head) can freely slide inside the shell without connecting to the shell flange. The entire tube bundle can be drawn out from the shell end.

Advantages

• Tube bundle fully removable; both shell side and tube side can be thoroughly cleaned

• Eliminates thermal stress caused by different thermal expansion of shell and tubes

• Adaptable to large temperature difference between shell and tube media

Disadvantages

• Complex structure, higher manufacturing price

• Larger shell diameter, higher space occupation

Typical Applications

Oil refinery heat exchangers, cement CCUS amine solvent exchangers, seawater-cooled marine coolers, high-fouling industrial circulating water systems

3. U-Tube Heat Exchanger

Structure Feature

All heat transfer tubes are bent into U shape, both tube ends fixed on a single tube sheet. Tube bundle can be pulled out separately.

Advantages

• Only one tube sheet, minimal thermal expansion stress

• Tube bundle detachable for easy shell-side cleaning

• High pressure resistance, ideal for high-pressure medium on tube side

Disadvantages

• The inner bend of U-tubes cannot be cleaned, not fit for high-fouling tube-side fluid

• Tube replacement is difficult; damaged single tube cannot be replaced separately

Typical Applications

High-pressure steam heat exchangers, power plant turbine condensers, high-pressure compressed air aftercoolers, refrigerant condensers

4. Kettle Type Reboiler (Kettle Heat Exchanger)

Structure Feature

The shell side has an enlarged vaporization chamber above the tube bundle, equipped with a liquid baffle. Mainly used for medium heating, boiling and vaporization.

Advantages

• Large vapor space, effective separation of liquid and vapor

• Stable boiling heat transfer, low liquid entrainment

• Tube bundle can be floating head or U-tube type for easy maintenance

Disadvantages

• Bulky structure, high material cost

• Large liquid inventory inside the shell

Typical Applications

CCUS solvent reboilers, heavy oil steam preheaters, chemical tower bottom reboilers, refrigerant evaporators