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Particulate fouling and composite fouling assessment in corrugated plate heat exchangers

机译:波纹板式换热器的颗粒结垢和复合结垢评估

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摘要

Experimental and theoretical investigations of water-side fouling have been performed inside four corrugated plate heat exchangers. They have different geometric parameters, such as plate height, plate spacing, and plate angle. Fouling experiments including particulate fouling tests and composite particulate and precipitation fouling tests have been performed. The tests are primarily focused on the effects of concentration and average velocity. Scanning electron microscope (SEM) was used to investigate the microscopic structures of composite fouling. Heat transfer coefficients and friction factors have been obtained in clean tests. The plate heat exchanger with the largest d_e and height to pitch ratio shows the best anti-fouling performance. The Von-Karman analogy was used to obtain mass transfer coefficient to develop appropriate semi-theoretical fouling correlations; The wall shear stress is obtained from the pressure drop. The model predictions agree well with experimental data.
机译:在四个波纹板式换热器内部进行了水侧结垢的实验和理论研究。它们具有不同的几何参数,例如板高,板间距和板角度。已经进行了包括颗粒污垢测试以及复合颗粒和沉淀物污垢测试的污垢实验。测试主要集中在浓度和平均速度的影响上。扫描电子显微镜(SEM)用于研究复合污垢的微观结构。在干净的测试中已经获得了传热系数和摩擦系数。 d_e最大且高度与螺距比最大的板式换热器表现出最佳的防污性能。用冯-卡尔曼(Von-Karman)类比法获得传质系数,以建立适当的半理论结垢关系。从压力降获得壁面剪应力。模型预测与实验数据吻合良好。

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