焦油产率系随着不同时代褐煤挥发分产率的增多而增加。
Tar yield increases with the increase of volatile matter yield of brown coal in different ages.
煤的干馏气和焦油产率与煤中可燃基挥发分之间有近似的线性关系。
It is also found that there is an approximate linear correlation between the yields of gas and tar of coal and the volatile matter of coal on dry, ash-free basis.
结果表明，石灰石的加入降低了焦油产率，提高了煤气产率，改善了煤气质量。
The experimental results proved that with the input of the limestone the yield of tar decreased and the yield of gas increased and the quality of the gas was also improved.
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