The cause of the plate heat exchanger fouling

Plate heat exchanger fouling factors

Scaling is refers to the plate heat exchanger and plate heat exchanger is unclean fluid phase touch and gradually built up on the solid surface of the layer of solid matter, because the dirt layer has a low coefficient of thermal conductivity, will add heat transfer resistance, drop in heat exchange equipment heat power;When heat exchange equipment composed of fouling layer on the surface, the heat exchange equipment in the fluid channel flow area will cut, causing fluid to flow through the resistance of the device add, which cost more pump power, has added the production cost.Usually the plate heat exchanger fouling has the following six factors:

The cause of the plate heat exchanger fouling

1, the condensation grime

Fluid in the condensation heat transfer surface is too cold, constitute the grime.For example, when the water below the freezing point and on the heat transfer surface is frozen.The temperature distribution of uniform or not had a great influence on the dirt.

2, corrosion dirt

Corrosive fluid may be fluid containing corrosive impurity dirt heat-exchange surface corrosion and attack.Usually, corrosion depends on the composition of fluid, temperature and the pH of the fluid are processed.

3, crystallization grime

Dissolved inorganic salt on the heat transfer in the fluid crystallization, constitute the debris on the surface, usually attack in full or cooling.The typical dirt such as cooling water side of calcium carbonate, calcium sulfate and silica scaling layer.

4, biological grime

In addition to the sea water cooling equipment, biological grime are often referred to as microbial grime.It may attack sticky mud, and sticky mud in turn to supply the reproduction condition of biological dirt, the dirt is very sensitive to temperature, under the condition of appropriate temperature, biological dirt can generate considerable thickness layer of dirt.

5, chemical reaction grime

In heat transfer of chemical reaction and the onset of dirt on the surface, heat transfer surface data don’t participate in the reaction, but can be used as a kind of chemical reaction catalyst.

6, dirt particles

Suspended in the fluid solid particles in the accumulation of heat exchange surface.The dirt also contains solid particles in a horizontal heat exchange larger because of the effect of gravity on the surface of accumulation, the so-called accumulation is the accumulation of dirt and other colloidal particles.

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