低压加热器铜管氨腐蚀分析及无铜化改进实验研究

分析了低压加热器铜管氨腐蚀的条件和机理,并对在低压加热器中采用钢制螺旋槽管替代原有铜光滑管,进行了基础实验和工业试验研究。以水蒸汽、水为介质的单管凝结换热实验的结果表明,钢质螺旋槽管的总传热系数比光管提高10%～17%,且钢质螺旋槽管低压加热器工业试验也表明,其总传热系数比铜光滑管低压加热器提高2.5%。因此,可以采用钢质螺旋槽管替代低压加热器中的铜光滑管,实现锅炉给水系统无铜化运行的要求。

Ammonia Corruption Analysis of Copper Tube Used in Low Pressure Heater and Experimental Research on Non-copper Improvement

The condition and mechanism of copper tube used in LP heater is analyzed. A basic and industrial experiment, where steel spirally fluted tube is used to replace copper smooth tube in LP heater, is carried out. The experimental results, which get from condensation heat transfer experiment of single helical tube using water vapor and water as its working pair, show that the overall heat transfer coefficient of the CS spirally fluted tube is 10%~17% larger than that of the CS plain tube. At the same time, the industrial experimental results also show that the total heat transfer coefficient of the steel spirally fluted tube is 2.5% larger than that of the copper plain tube. Therefore, using steel spirally fluted tube replacing copper plain tube in HP preheater can be adopted for the boiler feedwater system without copper.