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烟气中灰尘颗粒在换热器管束表面的沉积对换热器性能有较大影响,研究颗粒在管束上的沉积规律有较大的应用价值。本文应用格子Boltzmann与格子气自动机的耦合模型模拟了颗粒随流场的运动,并采用该模型模拟了颗粒在单排管束表面的沉积现象,得到了直径为5μm和10μm的颗粒在管子上的沉积形貌。接着模拟了直径为10μm的颗粒在顺排和叉排管束表面的沉积形貌,结果显示前排管束只在背风面发生沉积,而后排管束在迎风面和背风面同时发生沉积,且顺排管束上的颗粒沉积较多。因此,叉排布置有利于减小积灰。本文的研究可以展示颗粒沉积的规律,并为含尘烟气换热器的设计提供指导。
The deposition of the dust particles in the flue gas on the surface of the tube bundle has a great influence on the performance of the heat exchanger. It is of great value to study the deposition of particles on the tube bundle. In this paper, a coupled model of lattice Boltzmann and a lattice gas automaton was used to simulate the particles moving along the flow field. The model was used to simulate the deposition of particles on the surfaces of single-row tube bundles. The particles with diameters of 5μm and 10μm were obtained. Deposition morphology. Then, the deposition morphology of the particles with the diameter of 10μm on the surface of the row and the row of fork tubes was simulated. The results showed that the front row of tubes deposited only on the leeward side, while the rear row of tubes deposited on the windward and leeward side simultaneously, On the deposition of particles more. Therefore, the arrangement of fork row helps to reduce the fouling. The research in this paper can show the law of particle deposition and provide guidance for the design of dust flue gas heat exchanger.