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全自動量熱儀結果偏高原因淺析

发布时间：2013-07-29 點击次数：1397次

全自動量熱儀結果偏高原因淺析

全自動量熱儀結果偏高主要有以下四點因素：

一、全自動量熱儀热容量偏高

因爲熱容量是隨著全自動量熱儀本身和水的溫度再變化。比如你上次標定溫度是18.5度，現在使用溫度是28度，其熱容量一定與18.5度時變大了。這是做出來的結果應該偏高。建議24小時控制室溫，比經常校正熱容量，並做好標定記錄：水溫，室溫，標定時間。

二、全自動量熱儀的參數輸入是否有誤差

1 輸入分析水比實際值高。比如你輸入的分析水爲0.85，其實際值爲2.6 那么量熱儀结果一定比实际热值偏高。分析水与热值成正比

2 輸入全水比實際偏低。比如你輸入的全水爲8.6，其煤堆實際全水爲13.8，则量熱儀结果一定偏高。全水与热值成反比

3 氫含量和硫含量輸入值爲0。比如化驗室沒有測硫儀和冊氫儀，你直接輸入該兩項值爲0。其全自動量熱儀结果一定偏高

說明：化驗人員一定要安裝相關國家標准進行標准化驗。1 全水測量要及時，否則水分蒸發結果就不真實。2 分析煤樣一定密封保存，否則分析水一直在變化。3想要量熱儀结果非常精确，必须把硫，氢的含量值做出。

三、全自動量熱儀的內筒水量的多少

因爲全自動量熱儀原理就是點燃1g煤使定量的水升高的温度，来计算其发热量；所以如果水不定量，则温升一定不确定。自然量熱儀结果就不准确。

內筒水量比标定时减少，则量熱儀结果偏高。

四、全自動量熱儀环境温度变化大

全自動量熱儀是利用水的热交换原理来测量其热值。如果量熱儀所处的环境温度波动大，其结果必然受影响。

文章编辑：鶴壁市華通分析儀器有限公司

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