选用硅铝比分别为2.01和1.28的A、B两种煤灰为研究对象,考察煤灰在高温管式炉中的形变情况,并绘制高温灰柱的面积随温度的变化曲线,以探讨硅铝比对煤灰热膨胀性的影响。结果表明:A煤灰的膨胀程度比B煤灰明显,开始收缩温度较B煤灰高;在A、B煤灰中各自添加质量分数10%、20%、30%的Fe2O3、CaO、MgO后,A煤灰具有明显的膨胀性,收缩程度小,灰渣表面气孔大且密,B煤灰膨胀程度小,收缩程度大,灰渣表面气孔较少;不同硅铝比的灰柱在烧结初期产生的液相量差别较大,引起高温灰柱内气体残余量不同,导致高温下不同硅铝比灰柱收缩和膨胀存在差异。

There were A and B different fly ashes with the Si/AI ratio of 2.01 and 1.28 individually selected as the study objects in order to investigate the coal ash deformation conditions in the high temperature tubing boiler and to draw the area of the high temperature column with the temperature variation curve.The paper discus sed the influence of the Si/AI ratio to the thermal expansion of the fly ashes.The results showed that the expansion degree of the A coal ash would be more obvious tha n the B coal ash and the initial shrinking temperature of the A coal ash would be higher than the B coal ash.When the A and B coal ashes were individually added with t he quantity fraction 10%、20%、 30% of Fe203、CaO、MgO, the A coal ash would have an obvious expansion, a small shrinking degree and large and density gas hole s on the surface of coal ash slag and the expansion degree of the B coal ash would be small, the shrinking degree would be high and the gas holes on the surface slag would be less.The liquid phase quantity occurred at the combustion initial period of the coal ash column with a different Si/Al ratio would be high in different which could cause different gas residual in the high temperature coal ash column and would cause a different shrinking and expansion of the different Si/AI ratio coal ash column un der the high temperature.

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