Numerical Simulation Of Heat Exchange Performance And Dirt Influence Of Power Plant Heat Exchanger

Use of heat exchange equipment is very common In the actual the field of the generation and the application, however, because of the influence of operation conditions, dirt adsorption and deposition universally exist in the heat in the operation process of operation condition. When the dirt is deposited in the surface of heat exchange, the heat transfer coefficient will be reduced, which affects the normal work of the heat exchanger and make the medium of the thermal resistance increases greatly, thus it increases the costing of the economic operation in power production and reduces the property and safety performance of the heat exchange equipment. This article, by means of Segmentation grid and,using Fluent software and to the calcium carbonate solution for Working medium, simulates operation of the low-pressure heater and analyzes the region of dirt formation of Low pressure heater inside and the formation and influence of dirt by different conditions. Through the analysis of the simulation results indicate that the different speed conditions, due to the entrance of the working medium flowing bigger way resistance of the working medium flowing, dirt particles are easier to attachto the wall, dirt more likely to happen in the heater entrance, and the chance to form is increased as the reduction of inlet speed; And in different concentrations of the calcium carbonate, the higher the concentration, the easier the dirt in the low-pressure heater formed in the entrance; Low pressure heater in the same conditions, heat exchange tube From the center nearly has more higher speed, temperature and Calcium carbonate mass fraction than others at the same position of heat exchange tube.