During the use of tubular condenser, because of its large refrigeration area, it is very easy to form deposits on the refrigerated surface and scale, which increases the thermal resistance of the surface and affects the refrigeration speed. At present, many chemical production enterprises are due to the scaling problem in the use of tubular condensers, which affects the use effect, thus causing economic losses. So why do tubular condensers scale? Tube condenser is mainly water as its carrier and water as the fluid of condenser. Its nature not only refers to the nature of water itself, but also includes various substances contained in water. Therefore, in the process of condensation, the ions or some salts will crystallize with the change of temperature. These crystals will adhere to the surface of the tube condenser and form scales. At the stage of scales formation, they will be relatively soft. However, with the passage of time and the deterioration of refrigeration effect, the crystallization in scales will begin to lose, the scales will begin to harden, and in the surface. The surface forms a solid hard shell.
In the operation of tube condenser, the flow rate of fluid is not the faster the better, because when the flow rate increases, it may lead to an increase in scaling, but also increase the rate of sediment removal, so when the flow rate increases, the rate of scaling may be reduced. When the flow rate of the running tube condenser increases, not only the coefficient of the condenser will increase, but also the wear and tear will increase, which will increase the energy consumption. Therefore, the control of the flow rate of the tube condenser fluid needs to be considered comprehensively from the two aspects of energy consumption and fouling.
The surface material of condenser has great influence on the formation of fouling. If the surface material is not properly selected, it will play a role in promoting the formation of fouling. At present, there are many kinds of surface materials for condenser, such as copper alloy, carbon steel, stainless steel, stone star, ceramics and so on. Some of these materials can inhibit scaling, while non-metallic materials are not easy to scale, but their thermal conductivity is worse than that of metal materials. Therefore, when choosing the surface material of condenser, many factors should be considered comprehensively. In addition, there are some small bumps on the surface structure of the condenser, which will lead to the increase of absorption capacity and chemical activity, and easily lead to fouling deposition.
The most easily scaled part of the tubular condenser is the inner and outer wall of the tube bundle. When the fouling layer is formed at this location, the refrigeration capacity of the condenser will be reduced, and even the flow passage of the medium will be blocked. The fouling will occur because of the nature of the fluid, the velocity, the state and the parameters of the condenser.
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