Graphite heat exchanger is a heat exchanger made of graphite for heat transfer component. The graphite to be used in the manufacture of heat exchanger is not transparent, and is commonly used in impregnated graphite and graphite.
Graphite heat exchanger structure
Graphite heat exchanger can be divided into 3 types: the structure can be divided into block hole type, tube shell type and plate type. The block hole type is composed of a plurality of blocks with a plurality of holes. Shell: shell and tube heat exchanger in graphite heat exchanger occupies an important position, according to the structure is divided into fixed and floating head two. Plate: made of graphite bonding plate heat exchanger. In addition, there are immersion, spray type and sleeve type, etc. (see snake tube type heat exchanger, casing type heat exchanger). The graphite heat exchanger has good corrosion resistance, and the heat transfer surface is not easy to scale, and the heat transfer performance is good. But the graphite is easy to crack, bending and tensile strength is low, so it can only be used for low pressure, even if the best pressure bearing capacity of the structure, the working pressure is only 0.3 ~ 0.5 mpa. Graphite heat exchanger, high cost, large size, the use is not much. It is mainly used for heat transfer of hydrochloric acid, sulfuric acid, acetic acid and phosphoric acid and other corrosive medium, such as the condenser used for acetic acid and acetic anhydride.
According to the different materials, the graphite tube is divided into synthetic resin impregnation, water glass resin impregnation and asphalt impregnation.
Characteristics of graphite heat exchanger
The graphite heat exchanger has good corrosion resistance, and the heat transfer surface is not easy to scale, and the heat transfer performance is good. But the graphite is easy to crack, bending and tensile strength is low, so it can only be used for low pressure, even if the best pressure bearing capacity of the structure, the working pressure is only 0.3 ~ 0.5 mpa.
Graphite heat exchanger, high cost, large size, the use is not much. It is mainly used for heat transfer of hydrochloric acid, sulfuric acid, acetic acid and phosphoric acid and other corrosive medium, such as the condenser used for acetic acid and acetic anhydride. Mainly used in chlor alkali chemical industry, petrochemical industry, fluoride salt, titanium dioxide, zirconium, chloroacetic acid, chlorinated paraffin, silicon fluorine chemical industry production.
Classification of graphite heat exchangers
①The block hole type is composed of a plurality of block graphite elements with holes.
②The shell and tube type: shell and tube heat exchanger in graphite heat exchanger occupies an important position, according to the structure is divided into fixed and floating head two.
Shell and tube heat exchanger (shell and tube heat exchanger) is also called tubular heat exchanger. Is to close the bundle in the shell wall as heat transfer surface heat exchanger. The heat exchanger has the advantages of simple structure and reliable operation, and can be used for manufacturing various structural materials (mainly metal materials), and can be used under high temperature and high pressure, and is the most widely used type.
③The plate made from graphite plate bonding plate heat exchanger. In addition, there are immersion, spray type and sleeve type, etc. (see snake tube type heat exchanger, casing type heat exchanger).
Heat exchanger is a metal sheet with a corrugated shape by a series of stacked a new high-efficiency heat exchanger. A thin rectangular channel is formed between the various sheets, and the heat exchange is carried out by the half piece. Heat exchanger is an ideal heat exchange equipment for liquid - liquid, liquid - vapor. It has the characteristics of high heat transfer efficiency, small heat loss, compact and light structure, small occupation area, convenient installation and cleaning, wide application and long service life. Under the same pressure loss, the heat transfer coefficient is 3-5 times higher than that of the tubular heat exchanger, and the area of the heat transfer coefficient is 1/3, and the heat recovery rate can be as high as 90%.
