Abstract: Graphite heat exchanger is classified into two types: block heat exchanger and tubular heat exchanger. The advantage of tubular heat exchanger is that if there is a leak, the specific location can be traced quickly, while the disadvantage is that the strength and rigidity of the tube are relatively low. The assembly of heat exchange tube and tube sheet is comparatively hard especially for heat exchange tubes longer than 6 meters with the size of φ32/φ22. This paper analyzed the assembly principles of the heat exchange tube of the impermeable graphite tube heat exchanger. Combining with the assembly problems of graphite heat exchange tube and baffle plate and the treatment experience of the adhesion problem of heat exchange tube and tube sheet encountered in actual work, the paper discussed the solution to the assembly problems of graphite heat exchange tube and tube sheet. Then it summarized the causes for the assembly problems of graphite heat exchange tube and the troubleshooting methods for the problems.

Key words: graphite, tubular heat exchanger, heat exchange tube, assembly, non-concentric hole, graphite adhesion