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The Reason For The Scaling Of The Heat Exchanger
In the production of heat exchanger in chemical industry, power and occupies very important position, has formed a variety of development to today's heat exchanger structure, such as bar plate heat exchanger, the belt type heat exchanger. And whatever the structure of the heat exchanger will be produced in the process of use of a certain scale and corrosion phenomenon, resulting in heat transfer is not enough, to use a certain impact on the efficiency of mechanical or engineering.
What is the reason for the different structure of heat exchanger?
Particle dirt
Suspended in the fluid solid particles in the build-up of heat transfer surface, usually by fine sediment particles, dust, insoluble salt, jelly, oil, etc.
When containing these substances of the surface of the water flow through the heat exchanger, easy dirt sediment formation, formation of corrosion, provide a hotbed for some bacteria survive and reproduce. When the anti-corrosion measures are not at the time, they eventually cause the heat exchange surface to corrode and leak.
Crystal dirt
In cooling water circulation system, as the moisture evaporation, the water dissolved salts, such as bicarbonate concentration increased, some salts by supersaturated precipitation, while some salt precipitation through heat exchanger heat transfer surface thermal decomposition due. The scale is made of inorganic salt and crystallized, called crystalline scale.
Corrosive dirt
Dirt that is corroded by corrosive impurities in fluid or fluid. The degree of corrosion depends on the composition of the fluid, the temperature and the pH of the fluid being processed.
Usually, the dirt in cooling pipe cooling pipe generally for copper pipe and brass pipe, metal corrosion is mainly under the high temperature (40 ~ 50 ℃) oxygen corrosion, dirt on copper or copper alloy corrosion products and calcium magnesium sediment is given priority to, resulting in a large number of corrosion fouling.
Set dirt
A dirt that solidifies on a cold heat exchange. For example, when the water is below the freezing point, it solidifies into ice on the heat exchange surface. The uniformity of temperature distribution is very important to the dirt.
What are the reasons for the corrosion of metal materials?