Mitsubishi Heavy Industries Technical Review
    Vol. 53 No. 4 (2016)   New Products & Technologies
    Technical Papers

    Development of Analysis Method for Iron Tracing in Boiler Feedwater Using Filter Concentration Method

    Ayako Ureshino,
    Tetsuya Sawatsubashi,
    Akihiro Nozaki,
    Hiroshi Akamine,
    Senichi Tsubakizaki

    Boilers that use an oxygen treatment method (OT) for water treatment have the risk where the growth of powder-like scale consisting of eluted iron in feedwater equipment causes heat transfer inhibition and leads to problems such as tube leakage. For this reason, it is necessary to control the iron concentration of boiler feedwater to 2 μg/L or less to maintain stable boiler operation. However, the conventional analysis technique of minute amounts of iron is subject to the environmental effects and has the problem of ensuring analysis accuracy. This time, we developed a double filter concentration method that simultaneously uses a membrane filter and an iminodiacetate type chelate filter as a method to analyze minute amounts of iron easily and inexpensively. This paper presents the developed method. This method is adopted in the JISB8224 Boiler Feed Water and Boiler Water Testing Methods revised and published in March 2016.