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測定煤中灰分時結果不准確有哪些原因

发布时间：2017-04-19 点击次数：1980次

测定煤中灰分时结果不准确的原因一般有：燃烧不完全，引起爆燃，不通风等问题。鶴壁市華通分析儀器有限公司生产的HTGF-6000型工業分析儀，采用熱重分析法，自動稱樣、自動送樣、可同時測多個樣品、自動處理數據、結果計算、報表打印和存儲等，操作簡單、安全：試驗過程中無需取放出坩埚蓋、送樣和取樣，避免高溫輻射和燙傷的危險。

用馬弗爐測定煤中灰分時的注意事項：

1.送樣時，應將灰皿放在爐口，過程應緩慢，以免引起試樣爆燃，造成測試結果不准確；

2.樣品應放置在815℃±10℃的恒温区内（鶴壁市華通分析儀器有限公司生产的ZNXL-2高效節能一體化馬弗爐是從爐膛內兩側和頂部三面加熱，避免了灼燒溫度不均勻的問題。）。

3.樣品放進去後，關爐門時不應關嚴，應留有20mm的通風口，同時打開爐後壁上的煙囪，保證通風良好。

4.從爐中取出樣品，在空氣中冷卻5min後，應移至幹燥器中。

5.灰分大于15%時，需進行檢查性灼燒，在815℃±10℃的恒溫區灼燒20min後，進行稱量，直到灼燒後兩次質量變化不超過0.0010g，以最後一次灼燒質量爲准，計算結果。

6.對測定結果有異議時，可用標准煤樣進行自檢。

若测定结果仍不准确，可咨询鹤壁市华通分析仪器有限，帮您调试、维修、保养仪器，联系电话13939283560，聯系人：龍經理。

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