The structure of the plate heat exchanger is simple. It is composed of plates, sealing gaskets, fixed compression plates, movable compression plates, compression studs and nuts, upper and lower guide rods, and front pillars. The heat exchange plate is a heat transfer element, and the plate with the gasket attached is placed between the fixed compression plate and the movable compression plate in a certain order. Then use the compression stud to clamp the fixed compression plate, the plate, and the movable compression plate. What are the causes of plate heat exchanger clogging and scaling?
(1) The channel between the plates of the plate heat exchanger is very narrow, generally only 3~4mm. When the heat exchange medium contains large solid particles or fibrous materials, it is easy to block the channels between the plates.
(2) Most heat exchangers are selected according to the final heat load and have a large capacity. Once the initial operational load is small, the flow rate of the heat exchange medium in the heat exchanger is much smaller than the design flow rate. The shape of the flow channel is very irregular, so that some impurities entering the heat exchanger are not easy to be taken out of the heat exchanger, and it is easy to adhere to the stainless steel heat exchange surface to form dirt.
(3) The residual hardness of the circulating medium of the heat exchanger is high, and the dirt attached to the heat exchange surface is close to the high temperature side. After continuous baking, the CaHCO3, Ca(OH)2, MgHCO3, Mg(OH)2 crystals precipitated in the medium combine to form a thin scale, and after a long-term high-temperature baking, the scale layer is continuously thickened to form hard scale.Once the plate heat exchanger is blocked and fouled, it will inevitably lead to a reduction in heat exchange efficiency and poor heat exchange effect. In severe cases, the system resistance will increase, the flow rate on the high temperature side and the low temperature side will decrease, and the heat exchange amount will be insufficient.