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減小智能微機量熱儀誤差的方法

发布时间：2014-06-04 点击次数：1416次

煤質化驗煤灰揮發分測定是煤炭質量標准化驗中的一項重要項目，減小煤炭揮發分的測定誤差也是提高煤炭質量檢測精確度的技術標准。減小煤炭揮發分的誤差之一就是試驗煤樣的精確度，符合標准的試驗煤樣，再次就是煤炭揮發分測定儀器和檢測技術也是産生揮發分誤差的原因。

1煤質化驗儀器坩埚称量与放置要求
揮發分測定使用國家標准規定的專用坩埚，不得用其他坩埚取代。
坩埚與坩埚蓋應嚴密，它們各自對應編號。一般煤樣，稱取（1±0.1）g，准確至0.0002g。
市場上銷售的揮發分坩埚質量差別較大，坩埚重量（15-20）g，低要平、口要圓、蓋要嚴。
揮發分坩埚必須置于專用的坩埚架上，坩埚加則置于高溫爐恒溫區內，不得將坩埚直接置于爐低上測定。
坩埚架有大小之分，一般以4孔架爲宜，即一次放置4個坩埚。如8孔坩埚架，由于一次放入爐內8個冷坩埚，高溫爐降溫很大，要按規定在3mim內恢複（900±10）℃也較難。熱電偶要與坩埚中心位置相一致。
應該指出：揮發分也是要求重複測定，即同一煤樣，分兩爐次測定。當進行重要實驗時應按規定進行重複測定。

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