摘要： 为了降低某电厂600 MW亚临界汽包炉饱和蒸汽钠含量，以预防汽轮机积盐，将该锅炉炉水处理方式由常规磷酸盐处理方式（PT）转换为平衡磷酸盐处理方式（EPT）。试验结果表明：该锅炉炉水EPT工况磷酸盐平衡点为0.45～0.55 mg/L，控制炉水电导率小于10 μS/cm、用NaOH调整炉水pH 9.30～9.50、炉水钠小于1 000 μg/L、饱和蒸汽携带系数（以钠计）小于0.1%，可保证该机组额定工况运行时饱和蒸汽钠小于3.0×10^-6 g/kg，达到水汽质量标准要求的期望控制值。

关键词: 600MW亚临界汽包炉, 蒸汽钠含量, 平衡磷酸盐处理, 磷酸盐平衡点浓度

Abstract: In order to reduce the content of sodium ions in the saturated steam of a 600 MW sub-critical boiler unit for preventing salt deposition on steam turbine,the routine phosphate treatment method PT has been converted into equilibrium phosphate treatment method (EPT). The experimental results show that the Phosphate Equilibrium Point of the boiler water EPT working condition is 0.45-0.55 mg/L,and the boiler water conductivity is controlled at less than 10 μS/cm. NaOH is used for adjusting the boiler water pH to 9.30-9.50,and the sodium in boiler water is less than 1 000 μg/L and the carryover coefficient of saturated steam (by sodium) is less than 0.1%,so as to guarantee the saturated sodium in steam to be less than 3.0×10^-6 g/kg,while the rated working condition of the unit is running,reaching the expected controlled value required in the steam quality standard.

Key words: 600 MW sub-critical boiler unit, sodium content in steam, equilibrium phosphate treatment, phosphate equilibrium point concentration

中图分类号: 

• TK223.5