The Technology of Enhancing Heat Transfer and Preventing Fouling with Heat Transfer Dynaflow Twisted Strips

摘要

This paper discusses briefly the damage of fouling on heat exchangers. The damage is more serious, especially when the heat transfer coefficient is higher in the side where there is no fouling. The vacuum condensers equipped for steam turbines in power plants are taken as a typical example to analyze quantitatively. The structure principle of fouling preventing with the dynaflow twisted strip in each heat transfer tube is introduced. The experiments result shows that the ability of the technology to clean away fouling on line, continuously and automatically is great enough to meet the demand of removing or preventing fouling of heat exchangers, in which fouling will grow easily. Compared with the other advanced cleaning technologies such as using rubber balls, reciprocating brushes, etc., this technology has another advantage, i.e. to enhance heat transfer, because the fluid flows spirally led by the twisted strip. The enhancement is 9%-15%. The materials of the strips have been optimized to avoid the wear and tear on the heat transfer tubes wall. Application in large cooling and condensing equipments for over 3 years shows that there is no wear and tear, and the benefit is pretty high, e.g. there is average about 300 million tones water to be saved for each heat exchanger per year.