Plate heat exchangers are ideal equipment for liquid-liquid and liquid-vapor heat exchange. It has the characteristics of high heat exchange efficiency, low heat loss, compact and lightweight structure, small footprint, wide application, long service life and so on. Why is plate heat exchanger very prone to fouling?
(1) Particle fouling is the accumulation of solid particles suspended in fluid on the heat exchange surface. This kind of fouling also includes the precipitation layer of larger solid particles formed by gravity on the horizontal heat exchange surface. The so-called precipitation of dirt and other colloidal particles.
(2) Crystallized dirt. A deposit formed by the crystallization of inorganic salts dissolved in the fluid on the heat exchange surface. It usually occurs during supersaturation or cooling. Typical fouling such as calcium carbonate, calcium sulfate and silica fouling layer on the cooling water side.
(3) Chemical reaction dirt. The dirt produced by the chemical reaction on the heat transfer surface, the heat transfer surface material does not participate in the reaction, but can be used as a catalyst for the chemical reaction.
(4) Corrosion dirt. Corrosive fluid or fluid containing corrosive impurities corrodes the heat exchange surface and produces fouling. The degree of corrosion depends on the composition, temperature and pH of the fluid being processed.
(5) Solidified dirt. The heat exchange surface of the fluid subcooled plate heat exchanger will solidify and form fouling. If the water is below 0, the heat exchange surface will freeze into ice at this time. The uniform temperature distribution has a great influence on the fouling.