矿物组分对煤炭发热量的影响

Influence of Composition of Minerals on Calorific Capacity of Coal

定量研究了常见无机矿物对无烟煤发热量的影响．结果表明，方解石的分解率随其含量提高而降低，其吸热偏差可由分解率推算；高岭石主要分解产物是无定形非晶态物，少量转变为莫来石，发热量测定偏差可按其完全分解吸热计算；硫铁矿燃烧放热造成发热量测定结果偏高；石英没有变化，石膏脱水转变热效应很小，二者对发热量影响可以忽略不计．多种矿物复合影响试验表明，在矿物总量较高时校正值为各矿物独立热效应之和。

The influence of typical minerals on the calorific capacity of coal is quantitatively studied. The results indicate that the decomposition rate of CaCO 3 decreases with the increase of W (CaCO 3) during the process of calorific capacity(CC) determination. The deviation of CC value of coal caused by calcite decomposition can be calculated according to the decomposition rate. Gaolinite is transformed mainly to amorphous solid, some to mullite. The deviation of CC value can be deduced by assuming that gaolinite is totally transformed to amorphous solid. The complete combustion of FeS 2 contributes to the increase of CC value. The influence of gypsum and quartz can be neglected. It is demonstrated in the study that the total corrected CC value of minerals is equal to the sum of the CC value of each mineral when total mass fraction of minerals is great; if the mass fraction is relative small, overall heat effect produced by each mineral is only a little smaller than the CC value actually determined.