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简答题测定某难燃矸石的热值,如果称取被测矸石样0.5218g,掺入已知热值Qb,ad为31000J/g的煤样0.4890g,得到的弹筒发热量为16000J/g,已知该矸石的Mt=5.5%,Mad=1.23%,St,ad=0.53%,Had=2.45%,该硝酸校正系数为α=0.001,求难燃矸石的收到基低位热值?
  • 被测矸石的弹筒发热量为:[16000×(0.5218+0.4890)-31000×0.4890]/0.5218=1943J/g
    Qgr,ad=Qb,ad-(94.1St,ad+αQb,ad)=1943-(94.1St,ad;0.53+0.001×1943)=1907J/g≈1.91MJ/Kg
    该难燃矸石的收到基低位热值:Qnet,ar=(Qgr,ad-206Had)×(100-Mt)/(100-Mad)-23Mt=(1907-206×2.45)×(100-5.5)/(100-1.23)-23×5.5=1215J/g≈1.22MJ/Kg。
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