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煤炭灰分測定誤差的影響因素

发布时间：2012-06-28 点击次数：1629次

1、黃鐵礦氧化程度：2、碳酸鹽（主要是方解石）分解程度：3、灰中固定的硫的多少。

为了测得可靠的灰分产率，就必须使黄铁矿氧化完全，方解石分解完全，以及三氧化硫和氧化钙间的反应降低到最低程度，为此可采取以下措施：

1、采用慢速灰化法，使煤中硫化物在碳酸鹽分解前就完全氧化並排出，避免硫酸鈣的生成。

2、灰化過程中始終保持良好的通風狀態，使硫氧化物一經生成就及時排出，因此要求馬弗爐裝有煙囪，在爐門上有通風風眼，或將爐門開啓一小縫使爐內空氣可自然流通。

3、煤樣在灰皿中要鋪平，以避免局部過厚，一方面避免燃燒不完全，另一方面可防止底部煤樣中硫化物生成的二氧化硫被上部碳酸鹽分解生成的氧化鈣固定。

4、在足夠高的溫度下灼傷足夠長的時間，以保證碳酸鹽完全分解及二氧化碳完全驅出。

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