脱硫废水零排放处理系统蒸发段翅片结构的数值模拟

Fin Structure Simulation at the Evaporation Section in Desulfurization Wastewater Zero Discharge System

构建了一套新型脱硫废水零排放处理系统,针对该系统中相变换热技术与多效蒸发技术的耦合点,对蒸发段烟气侧不同结构的翅片进行数值模拟研究。结果表明:翅片间距过小时,会增大烟气压降,使风机功耗过大,从而导致成本增加,当翅片间距为8 mm时,传热性能最佳;翅片高度过大时,传热阻力过大,翅片高度过小时,烟气压降过大,使得风机功耗过大,成本过高,当翅片高度为10 mm时,翅片管的传热性能最佳。

In this paper,a new desulphurized wastewater treatment system with zero discharge was constructed.Aiming at the technical coupling point of phase transformation heat exchange and multi-effect evaporation in the system,the different structure fins on the flue gas side of the evaporation section were simulated.The results show that,the too small fin spacing can increase pressure drop of the flue gas and enlarge power consumption of the fan which leads to the increase of cost.As for a 8 mm fin spacing,the heat transfer performance becomes best.The higher fin height results in larger heat transfer resistance and the lower fin height can increase pressure drop of the flue gas which will cause large fan power consumption and higher cost.A 10 mm fin height can bring about the best heat transfer performance of the finned tube.