Compact Structured Graphite Block 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.

The details of graphite block heat exchanger with round holes

Description

Graphite block heat exchanger are divided round block hole type graphite heat exchangers and cubic block hole type graphite heat exchangers according to their structure. They are composed of several graphite heat exchange blocks with material channels, upper and lower graphite heads, their metal cover plates, a cylindrical steel shell (for round block hole type) or two end side covers (for cubic block hole type), and other main components. The parts are sealed with gaskets and secured with long bolts. They are commonly used in heating, cooling, evaporation and other processes in chemical, petroleum, metallurgy and other industries.

Features

Compact structure with a small footprint. The graphite blocks mainly bear compressive stress and can make full use of the high compressive strength of graphite materials.
Strong adaptability. It can be used in many chemical processes including heating, cooling, condensation, evaporation, reboiling, absorption, and desorption.
Good interchangeability of parts. It adopts building block detachable combination structure and can be assembled into equipment with various heat exchange areas. The disassembly, installation, cleaning, maintenance, and transportation are convenient, which has great advantages for manufacturing and maintenance.
No adhesive is required for connection.

Specifications

Table 1: Graphite Block Heat Exchanger Performance
Material	Material Description	Corrosion Resistance	Limitations	Temperature
HMC-1	Phenolic resin impregnated extruded graphite	Against most common acids	Alkalis, oxidizing chemicals	200 °C
HIS-1	Phenolic resin impregnated isostatic graphite	Against most common acids	Alkalis, oxidizing chemicals	220 °C
HIS-2	Carbon impregnated isostatic graphite	Against most common acids + mildly oxidizing media	Strong alkalis, very oxidizing chemicals	430 °C
Silicon Carbide	Sintered silicon carbide	Universal	None	250 °C
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 block heat exchanger is an efficient heat transfer equipment that can be divided into round block hole type graphite heat exchanger (left in the picture) and cubic block hole type graphite heat exchanger (right in the picture).

The round block hole type graphite heat exchanger has a series of equally spaced, parallel holes with the same diameter and length that are opened inside the graphite cylinder, and both ends of the holes are connected to the outer surface of the graphite cylinder. Fluid flows in these holes, transfers heat to the graphite block through contact, and then transfers heat to the other side through the conduction of the graphite block.

Cubic block hole type graphite heat exchanger has a series of rectangular cross-section holes that are opened inside the graphite cubic block, and both ends of the holes are connected to the outer surface of the graphite cubic block. Fluid enters from one side of the holes and contacts with neighboring graphite blocks through the holes, thus achieving heat transfer.

In general, their principle is to make use of the channels inside the graphite blocks to conduct heat transfer. Of which, round block hole type graphite heat exchanger features compact structure, small footprint, and high heat transfer coefficient. While cubic block hole type graphite heat exchanger features larger heat exchange area, low fluid resistance, and strong versatility. In practical applications, selecting different types of graphite block heat exchangers according to specific process conditions can effectively improve production efficiency and save energy.

The structure principle of 2 kinds of graphite block heat exchagner