Autoclave is commonly used test device for evaluating the performance of direct coal liquefaction.Due to autoclave products are hard to be completely sampled and measured,the inlet and outlet materials and ash are actually out of balance.The accuracy of experimental data on this basis is low,thus it is needed to make a reasonable adjustment of the materials and the ash to achieve the balance.The method to adjust the materials and ash to achieve balance was described,and on the basis of materials balance,oil yield formula of autoclave was modified.The results show that in order to ensure the real test data,the material balance of outlet and inlet is preferably more than 95％,and the ash balance is preferably 90％-110％.The commonly used formula for calculating oil yield is revised.The oil yield calculated by the modified oil yield formula is 1.14％ to 3.42％ higher than that without modification.%高压釜是评价煤液化性能常用的设备,针对高压釜中产物存在的挂壁现象,难以完全取样计量,导致进、出物料及灰达不到完全平衡,不同高压釜数据可比性差,不能真实反映不同煤种的液化性能等问题.论述了如何合理处理损失以达到进、出物料及灰的完全平衡,并在物料平衡的基础上,对高压釜的油产率计算公式进行了修正.结果表明,为了保证试验数据更真实,未处理的进、出物料平衡最好在95％以上.灰平衡计算可以间接反映所取分析样品是否具有代表性,灰平衡越接近100％,则所取样品代表性越好.研究发现,灰平衡在90％ ～ 110％为宜.与原有的油产率计算结果相比,使用修正的油产率公式,油产率会提高1.14％ ～ 3.42％.
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