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热力发电  2014 

电力用油酸值测定标准修正

, PP. 116-118

Keywords: 电力用油,酸值,测定标准,再现性,指示剂

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Abstract:

gb/t264-1983《石油产品酸值测定法》和gb/t28552-2012《变压器油、汽轮机油、抗燃油酸值测定法(btb法)》测定电力用油酸值时,再现性较差。分析原因为当油样的酸值较大时,在上述2种标准方法指示剂的变色区域内,溶液ph值随碱液的体积变化不明显,不出现滴定突跃,溶液的颜色也不能发生突变,导致无法准确判断滴定终点。对此,建议将滴定终点修正为:用碱兰6b作指示剂时,溶液的蓝色消失;用btb作指示剂时,溶液由黄色变为黄绿色;对于颜色较深,终点难以判断的油样,减少称样量。方法经修正后,有效改善了再现性差的问题,有利于电力用油质量监督。

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