自备热电站锅炉燃烧器节能技术改造

介绍了对自备热电站锅炉燃烧器的技术改造内容。通过改造,锅炉出力显著提高,单台锅炉年节约标煤6820t且减少了环境污染。

Prediction and critical transition mechanism for granite fracture:Insights from critical slowing down theory

Rock fracture warning is one of the significant challenges in rock mechanics.Many true triaxial and synchronous acoustic emission(AE)tests were conducted on granite samples.The investigation focused on the characteristics of AE signals preceding granite fracture,based on the critical slowing down(CSD)theory.The granite undergoes a transition from the stable phase to the fracture phase and exhibits a clear CSD phenomenon,characterized by a pronounced increase in variance and autocorrelation coefficient.The variance mutation points were found to be more identifiable and suitable as the primary criterion for predicting precursor information related to granite fracture,compared to the autocorrelation coefficient.It is noteworthy to emphasize that the CSD factor holds greater potential in elucidating the underlying mechanisms responsible for the critical transition of granite fracture,in comparison to the AE timing parameters.Furthermore,a novel multi-parameter collaborative prediction method for rock fracture was developed by comprehensively analyzing predictive information,including abnormal variation modes and the CSD factor of AE characteristic parameters.This method enhances the understanding and prediction of rock fracture-related geohazards.

松动爆破作用下的瓦斯抽采效率研究

针对象山煤矿掘进面煤层透气性差、瓦斯涌出量大难题,基于21301掘进迎头地质条件和数值模型试验,开展了松动爆破作用下煤层力学响应与瓦斯抽采效率研究。在瓦斯抽采气-固耦合理论基础上,借助有限元软件分析了爆破后煤层渗透率、瓦斯压力变化规律。数值模型结果表明:在爆破动载荷作用下,煤层的塑性破坏极大的提高了自身的渗透性能。环绕爆破钻孔所产生的高渗透性区域,促使瓦斯向抽采钻孔内快速转移,达到降低瓦斯含量的目的。与现场所收集瓦斯累计流量相对比,验证了松动爆破耦合模型的合理性,最终污风内瓦斯浓度在0.4%。

近水平煤层群上行开采矿压显现规律

近距离煤层群上行开采作为卸压开采的基本手段,一直是煤炭行业的热点和难点问题。针对贵州省织金县珠藏镇红岩脚煤矿目前的开采现状,本文采用UDEC数值模拟软件建立相应的分析模型,对32号煤层的上行开采可行性进行了研究,模拟了近水平煤层群开采过程中的顶板垮落过程,从工作面倾向着重分析了顶板的垮落和周期来压,研究得出近水平煤层群上行开采矿山压力显现规律,为贵州地区以及同等地质条件近水平煤层上行开采提供借鉴。