Increasing the residence time of the volatile matter, the yield of tar is decreased and that of gas is increased.

随着挥发物停留时间的增加，其焦油收率均下降，而气体收率则上升。

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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.

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。

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Calcium oxide in circulating ash is favorable to decrease the yield of tar and increase the yield of gas in partial coal gasification process with the circulating fluidized bed technology.

在以循环床锅炉循环灰为热载体、部分气化产生的半焦为锅炉燃料的煤的部分气化技术中，循环灰中的氧化钙对降低焦油产率、提高煤气产率是有利的。

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