低磷酸盐处理方式下炉水pH值的计算方法及应用  

CALCULATION METHOD OF pH VALUE IN BOILER WATER UNDER LOW PHOSPHATE TREATMENT MODE AND APPLICATION THEREOF

作　　者：张维科[1] 孙本达[1] 楼亿红 

机构地区：[1]西安热工研究院有限公司,陕西西安710032 [2]广州珠江电厂,广东广州511457

出　　处：《热力发电》2011年第9期34-37,41,共5页Thermal Power Generation

摘　　要：对炉水中各种碱化剂(NH3、Na3PO4和NaOH)对炉水pH值的影响进行分析,给出了低磷酸盐处理方式下炉水pH值的计算方法,并给出不同炉水处理体系炉水pH值与炉水PO43-含量的关系曲线及典型应用。研究结果表明:(1)在炉水pH值计算时,如果PO43-小于2 mg/L,则可以将Na3PO4当作一元强碱来处理;(2)在炉水NaOH和Na3PO4含量较低的情况下,炉水中氨对pH值的作用显著;(3)将现有的水汽品质在线监测数据如给水电导率、炉水PO43-浓度以及配药时NaOH与Na3PO4.12H2O的比例代入炉水pH值计算公式即可方便地计算出炉水pH值,从而有效指导炉水pH值的控制和判断炉水pH值测量的准确性;(4)不同炉水处理体系的关系曲线有助于合理选择炉水处理方式。The influence of different alkalization agents,i.e.NH3,Na3PO4,and NaOH,in boiler water upon the pH value of boiler water has been analysed,the calculation method for pH value of boiler water under low phosphate treatment mode being given,and the relationship curves between pH value of boiler water and the PO3-4 content in boiler water in different boiler water treatment systems and their typical application being also given.Results of study show that as listed in the following：（1） during the time of calculating the pH value of boiler water,if PO3-4 is less than 2 mg/L,the Na3PO4 can be handled as one-dimentional strong alkaline;（2） under condition of NaOH and Na3PO4 content inboiler water is lower,the effect of ammonia in boiler water upon the pH value is remarkable;（3） the existing on-line monitoring data of steam-water quality,such as feed-water conductivity,PO3-4 in boiler water,as well as proportioning ratio of NaOH and Na3PO4·12H2O in making up the dosage can be substituded into the calculation formula of pH value in boiler water,the pH value of boiler water can be conveniently calculated out,giving effective guidance to pH value control of boiler water,and can judge the accuracy of pH value measurement for boiler water;（4） the relationship curves in defferent boiler water treatment systems are useful to select the suitable boiler water treatment mode.

关 键 词：炉水 低磷酸盐处理 pH值计算方法 NH3 Na3PO4 NAOH 

分 类 号：TM621.8[电气工程—电力系统及自动化]