压力渗流润湿煤体的实验研究

采用纯水和粘尘剂溶液，对不同煤质的压力渗流特性进行了研究。结果表明，煤体的层理方向和溶液的力学特性对压力渗流润湿煤体的效果影响很大，在中、低压力下，纯水的压力渗流湿润煤体的效果远不能满足煤层注水的要求，注水中添加粘尘剂等改变水的表面张力的物质，可大为提高相同压力注水润湿效果。

EXPERIMENTAL STUDY ON WETTING COAL BY PRESSURE-SEEPAGE FLOW

To study the pressure-seepage flow regularity in the veins of coal is very important to dust reduction of coal bed by injecting water.In order to mensurate the effect of wetting coal accurately by pressure-seepage flow, the properties of pressure-seepage flow are measured and studied in the present paper with pure water and dust-cohering agent. Several different kinds of coal, which come from three typical mines, are tested with the simulative experiment device. The samples of the coal are prepared according to the National Standard (GB 482-95). The results of the contrastive experiments of the pressure-water (liquid) wetting coal are given in Table 2. The results show that the effect of wetting coal by pressure-seepage flow are greatly affected by the veins of coal and mechanical properties of solution. For different kinds of coal, the effects of wetting using pure water can not meet the demand of coal bed injecting water under low, middle pressure. However, the addition of some substance, such as dust-cohering agent, can change surface tension of water. So the effect of wetting under the same pressure is improved. On the same condition, the effect of wetting can be improved by 0.32~10 times.