综放工作面注水降尘技术

Dust reduction technology of fully mechanized caving face

赵庄二号井开采的3#煤层为厚煤层,选用的是综采放顶煤采煤方法,生产过程中粉尘浓度较大,传统的喷雾降尘方法不能够满足现场降尘的需要。为了进一步降低工作面粉尘浓度,改善工作面劳动环境,为创建安全、高效型矿井提供良好的生产条件,文中针对3#煤层孔隙率小、渗透性低、润湿性差等特征,采用混合注水方式进行煤层注水降尘技术分析研究及现场试验。分别从钻孔布置方式、注水封孔工艺、注水工艺及参数和降尘效果等方面进行了阐述,分析了煤层注水对工作面超前支承压力的影响变化,并提出了添加烷基酚聚氧乙烯醚TX-10表面活性剂改善煤体润湿性,增强了煤层注水润湿效果。结果表明,实施注水工艺技术后,煤层水分平均增量为1.61%,全尘平均降尘率达58.71%,呼尘平均降尘率为57.34%,大幅度降低了工作面粉尘浓度;添加润湿剂后,增加了钻孔注水量,缩短了注水时间,扩大了润湿范围,改善了注水效果。实践证明,该套注水降尘工艺用于综放工作面降尘是切实可行的。

The No. 3 coal in Zhaozhuang II mine is a thick coal seam, fully mechanized top coal caving is selected coal mining method, and large dust concentration is produced during the production process;the traditional method of spray and dust reduction is not able to meet the needs of dust reduction. In order to further reduce dust concentration in coal face to improve face labor environment, to create a safe and ef- ficient mine with good production conditions, according to the 3# coal seam＇ s few porosity, low permeability, and poor wetting condition, we adopted the mixed water injection technique for analysis research and field testing. Expound drill holes＇ distribution, water injection hole sealing process, water injected method and dust suppression effect. Analyze coal seam water injection effect on the advance of working face abutment pressure changes ,and add TX-10 of alkyl phenol polyoxyethylene ether surfactants to im- prove wettability of coal, enhancing coal seam water-wet effect. The results showed that after putting the mixed water injection technique into effect, the coal moisture is increased by 1.61%, all average rate of dust reduction is 58.71%, and the average rate of respirable dust fall is 57.34%, substantially reducing the dust concentration. The practice shows that this technique of water injection for dust reduction can be applied into fully mechanized caving coal face.