Graphite Shell & Tube Heat Exchanger – The Most Widely Used Graphite Heat Exchanger

  • High thermal conductivity and low coefficient of linear expansion.
  • Excellent chemical and thermal stability.
  • Good corrosion resistance, thermal conductivity, and electrical conductivity.
  • Good physical & mechanical properties and machinability.
Graphite heat exchange tubes are installed in the shell.
Description

Graphite shell & tube heat exchanger, also known as graphite tubular heat exchanger, is an inter-wall heat exchanger that uses the tube bundle enclosed in the shell wall as the heat transfer surface. It occupies an important position in graphite heat exchangers and can be divided into fixed-head type and floating-head type according to their structure.

Its advantages are easy to find leaks and easy to repair damaged tubes. The disadvantages are that the strength of graphite tubes is relatively low, and the steam pressure used cannot exceed 0.15 MPa. The flow rate of the heated medium is low and can only be controlled at 2–3 m/s. The temperature difference between the inlet and outlet can only be controlled at 2–4 °C. The heat exchanger features large volume, simple structure and reliable operation. It can be made of various structural materials, and can be used under high temperature and high pressure conditions. It is currently the most widely used type of heat exchanger.

Features
  • High thermal conductivity and goog corrosion resistance.
  • Low coefficient of linear expansion, high temperature resistance and thermal shock resistance.
  • The surface is not easy to scale and no pollution.
  • Good physical, mechanical and machining properties.
  • Low density and lightweight.
Specifications
Table 1: Graphite Shell & Tube Heat Exchanger Performance
Grade Density (g/cm3) Thermal Conductivity (100 °C, W/mk) Hydraulic Blasting Strength (MPa) Compressive Strength (MPa) Flexural Strength (MPa) CTE (× 10-6 °C-1) Anti-Penetrant Efficiency
GT-1 (Graphite Tubes) 1.8 32 7 (Size: φ32 mm / φ22 mm × 300 mm) 75 50 8.2 φ32 mm / φ22 mm × 100 mm sample under 1 MPa water pressure 10 minutes, no leakage
GT-2 (Graphite Tubes) 1.85 108 7 (Size: φ32 mm / φ22 mm × 300 mm) 75 50 2.8 φ32 mm / φ22 mm × 100 mm sample under 1 MPa water pressure 10 minutes, no leakage
Notes:
  • 1 MPa = 10.2 kgf/cm2; 1 W/m.k = 0.86 kcal/cm.h.°C
  • These properties are typical values and not guaranteed.
Structure Principle

Graphite shell & tube heat exchanger is an efficient heat transfer equipment composed of graphite tube bundles, graphite end caps, seals, support brackets, and other components. The graphite tube bundles are the main heat transfer component that consists of multiple graphite tubes. During use, the fluid passes through the interior of the graphite tube and undergoes heat transfer with the graphite tube surface, thus achieving the purpose of heat exchange. Graphite material has high thermal conductivity and good chemical stability, so this graphite heat exchanger has high efficiency and durability, and is widely used in the fields of chemical, pharmaceuticals, and food.

The structure of graphite shell & tube heat exchanger with many graphite tubes