【简答题】
化水凝水装置产水要求满足哪些水质指标？水质指标的选择依据是什么？
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答案
化水凝水装置除盐水水质要求二氧化硅≤20μg/L，电导率≤0.2μs/cm。
原水经过预处理和离子交换除盐后，水中的含盐量极低，水质已接近纯水。如果具体测定水中各离子的含量（如Ca2+、Na+、Cl-、SO42-等），由于离子含量极低至痕量水平，测定精度要求很高，会增加测定设备成本和工作量。因此对于除盐水，测定电导率指标即可代表水中离子的总体含量，在含盐量极低的条件下能够满足评价除盐设施运行效果和控制除盐水水质的要求。
二氧化硅在水中呈分子态存在，不会电解生成阴阳离子，因此电导率无法体现除盐水中的硅含量。在锅炉高温高压制蒸汽的运行环境中，如果除盐水中的硅含量偏高，将极易造成锅炉内部结垢、堵塞，影响锅炉的安全平稳运行。因此需将二氧化硅含量作为除盐水的水质控制指标。
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