Graphite Heat Exchanger – Solving Equipment Corrosion Problems

Since its introduction in the 1930s, graphite heat exchangers have developed rapidly and have been widely used in heating, cooling, evaporation and other processes in chemical, food, pharmaceutical and other industries. Graphite heat exchangers have replaced a large number of heat exchangers made of stainless steel or other precious metals due to their good thermal conductivity, excellent corrosion resistance, non-polluting nature, and other properties, thereby solving the corrosion problems of many equipment in the chemical industry and other sectors.

Graphite heat exchanger is a kind of heat exchange device made of impervious graphite as the base material. There are shell & tube type, block hole type, plate chamber type, spray type, insert type and jacket cooling type graphite heat exchangers. Among them, the most widely used are shell & tube type and block hole type graphite heat exchangers.

A row of graphite heat exchangers with holes of the same diameter
Table 1: Graphite Block Heat Exchanger vs Graphite Shell & Tube Heat Exchanger
Item Graphite Block Heat Exchanger Graphite Shell & Tube Heat Exchanger
Category When being used for cooling applications, graphite block heat exchangers are often made into rectangular shape with graphite elements being square or rectangular in shape. When being used for heating applications, graphite block heat exchangers are typically made into round shape with graphite elements being circular or circular with a hollow hole in the middle. According to the installation position, they are divided into vertical and horizontal graphite shell & tube heat exchangers. According to the flow direction, they are divided into single flow and double flow graphite shell & tube heat exchangers. Floating-head graphite shell & tube heat exchangers can be divided into Type I without gas-liquid separator and Type II with gas-liquid separator.
Advantages It has high compressive strength, high material utilization, and can withstand higher pressure. Besides, it has a compact structure, a small volume, and a high heat transfer coefficient, and can be used as heaters, coolers, condensers, etc. It has a simple structure and is easy to manufacture. Besides, it has high material utilization, low cost, a large heat transfer area, low fluid resistance, and strong applicability. It can be used as coolers, condensers, heaters, evaporators, etc.
Disadvantages Due to its small pore size, it is prone to clogging and is not suitable for heat transfer of materials with crystallization. Its pressure and temperature resistance is lower than that of the round block hole type graphite heat exchanger.