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量熱儀怎樣測試飼料的總能量

发布时间：2014-05-26 点击次数：1499次

很多客戶看過我們的地網站後都會疑惑，量熱儀測量煤的熱量挺好的，怎麽還能測量飼料？用于煤質行業可以了，怎麽還能用于食品行業呢？今天鶴壁華通分析儀器有限公司就爲您講解一下量熱儀化驗飼料總能量的實驗原理：

有機物的燃燒熱系單位質量有機化合物完全氧化時，所能釋放出的熱量，稱爲該物質的燃燒熱，也稱總能。
    根据热力学第一定律，一个热化学反应，只要其开始与终末状态一定，则反应的热效应就一定。这一原理使我们测定各种物质的燃烧热变为有意义。有机物差不多均能氧化完全，并且反应进行很快，因此，准确地测定燃烧热就有了可能。由所测得的燃烧热还可以计算反应的热效应和化合物的生成热。
   将由消化代谢试验所用的饲料或日粮以及所收集的粪、尿样品，制备成一定质量的测定试样，装于充有（25±5）kg·cm-2纯氧氧弹中进行燃烧。燃烧所产生之热量为氧弹周围已知质量的蒸馏水及热量计整个体系所吸收，并由贝克曼温度计读出水温上升的度数。该上升的温度乘以热量计体系和水的热容量之和，即可得出试样的燃烧热。全自动量热仪
   在测定过程中一些因素会影响测定结果的准确性，须加以校正才可得出真实的热价。例如，由于辐射的影响，水温上升的度数与由燃烧产热所致的实际升温之间有偏差；引火丝本身燃烧的发热量；以及含有氮、硫等元素的样品，在氧化后生成硝酸、硫酸，其发热量应予以扣除等。

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