The fouling of the plate heat exchanger is a solid material that gradually accumulates on the surface of the solid surface as the plate heat exchanger contacts the dirty fluid. Due to the low thermal conductivity of the dust layer, the heat transfer resistance will be increased to reduce the heat transfer power of the heat exchange equipment. It will reduce the flow area of the fluid passages during the preparation process and increase the fluid resistance flowing through the equipment, which will consume more pump power and increase production costs.
There are six influencing factors for the fouling of plate heat exchangers.
(1)Contaminants and dust formed by the condensation of dirt and liquid on the surface of the subcooled heat exchanger.For example, when the water is below the freezing point, it condenses on the surface of the heat exchanger to form ice. The uniformity of temperature travel has a large effect on dust and dirt.
(2)Corrosive or corrosive fluids may contain corrosive particles that are corrosive to corrosive surfaces. Generally, the degree of corrosion depends on the composition of the fluid, the temperature and the pH of the treatment fluid.
(3)The accumulation of inorganic salts that crystallize in the fluid and crystallize on the heat exchange surface typically occurs during filling or cooling, typically on the cooling water side of the calcium carbonate, calcium sulfate and silica structural layers.
(4)Biological dust and dirt, except for seawater cooling devices, generally refer to microbial dust and dirt. It can attack clay, which in turn provides conditions for the regeneration of biological dust, which is temperature sensitive. Under suitable temperature conditions, biofouling can produce a substantial thickness of the dust layer.
(5)The chemical reaction of dust on the chemical reaction surface occurs, and the heat transfer surface material does not participate in the reaction, but it can be used as a catalyst for chemical reactions.
(6)The particulate dust is suspended in the heat transfer of the surface of the solid particles. This dust also contains a cumulative layer of gravity of the larger solid particles on the horizontal heat transfer surface, ie the accumulation of dust and other colloidal particles.