Analysis Of Carbon Deposit In Heat Exchanger Of Furfural Wastewater Closed-circuit System And Study On Online Cleaning System

Scaling in heat-exchange equipment is very common. It can be found in natural environment, daily life and various industrial processes, especially in heat transmission process. Carbon deposit is s a type of scaling, which occurs in many heat-exchange equipments and poses a serious threat to the safety and economical operation of equipment. Therefore, carbon deposit research is of great significance, not only in that it can facilitate the solution of practical problems, but also improve the theoretical research regarding scale inhibition through intensified heat exchange.Based on the analysis of the mechanism of scale formation, composition and property, as well as on the current scale research, the thesis firstly explains the reason for carbon deposit in furfural wastewater heat exchanger in furfural closed-circuit circulating system, and discusses the hazard and influence of carbon deposit in heat exchanger.(1)Carbon deposit can significantly reduce the thermal conductivity of heat exchanger. Thick carbon deposit can result in uneven heat exchange. Accumulation of carbon deposit often leads to local corrosion and even punches in heater surface, posing a serious threat to the safety of equipment.(2)Carbon deposit in pipes can reduce the sectional area and increase flow resistance, thus resulting in increased pressure drop within the entire heat exchanger. To maintain the performance of heat exchanger and heat transfer capacity, the power consumption of pump has to be increased.(3)As the equipment continues to work, there are more carbon deposits in the heat exchanger, which can block the pipe and cause the breakdown of the entire furfural closed-circuit circulating system. Cleaning will reduce the continuous service span of equipment.Secondly, the paper deals with carbon deposit cleaning method and selection of detergent, and then provides a thorough discussion of various online cleaning methods and their application.Finally, the paper focuses on carbon deposit in furfural wastewater heat exchanger with respect to a typical furfural closed-circuit circulating system. Through analysis of the source and composition of furfural wastewater, selection of detergent, and structure of online cleaning device, the paper proposes a series of effective online cleaning methods, which can serve as a good reference for engineering application.