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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。
The conditions and mechanism of ammonia corrosion of low-pressure heater brass are analyzed. The basic experiment and industrial experiment are also carried out to replace the original copper smooth tube with steel spiral groove tube in low-pressure heater. The experimental results of single tube condensation heat transfer with steam and water as medium show that the total heat transfer coefficient of steel spiral tube is increased by 10% ~ 17% compared with that of optical tube, and the industrial experiment of steel spiral tube low pressure heater It shows that the total heat transfer coefficient is 2.5% higher than copper smooth tube low pressure heater. Therefore, the use of steel spiral groove tube can replace the low-pressure heater in the smooth copper pipe, boiler feed water system to achieve copper-free operation requirements.