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煤中的元素分析

发布时间：2012-08-03 点击次数：1650次

煤除了含有部分礦物雜質和水外，其他都是有機物質。煤中的有機物質主要是由碳、氫、氧、硫等五種元素而組成的。煤中碳的含量是隨著煤的煤化程度的加深而增高。如可由接近植物纖維素和木質素的泥炭、褐煤變到接近半石墨的無煙煤。通常也常把煤的煉化程度稱作變質程度。相對應的煤中氫和氧的含量則是隨著煤的煉化程度的加深而顯著降低。因此很早以前就把元素組成作爲煤炭科學分類的指標之一。

煤中氮的主要由成煤的植物中蛋白质而转来的。以蛋白质氮的形态存在的氮只见于泥炭和褐煤炎中，在烟煤中很少见或者几乎没有。煤中氮通常均为有机氮化，其中有一些杂环型的、在贫煤和无烟煤杂环比例会更多一些。在泥炭和褐煤中又是以蛋白质氮形态存在。

氧是煤中的主要元素之一。氧在煤中存在的總量和形態直接影響著煤的性質。

煤的元素組成還用來計算煤的發熱量，它估算和預測煤的低溫幹餾産物。以煤作燃料的動力工業中，熱工計算時則必須要以煤的元素組成作爲基礎，來計算燃燒産物和熱平衡。

煤的無機組分中也會有少量的碳、氫、氧、硫等元素，在了解了煤中有機持的元素組成及對煤進行分類時，應以重液洗選後的浮煤來測定。

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