氨吸收制冷装置运行总结

简述了氨吸收制冷工艺原理,分析了系统运行中出现磨损、泄漏、腐蚀和结垢问题的原因,认为设计问题是磨损和泄漏的原因,铵根离子、溶解氧、钙离子、粘泥、氯离子和硫酸根离子是造成腐蚀和结垢的原因。通过更改叶轮尺寸、密封形式、循环水流程,装置改造后运行稳定,具有节能、环保、易操作、节省投资的特点。     

对延长退休年龄的思考

我国法定退休年龄偏低,在当前企业社会保险费率过高,养老保险金缺口巨大的背景下,延长法定退休年龄成为改革的必然趋势.但在巨大的就业压力以及社会各阶层利益需要平衡的背景下,应当选择在条件成熟时,再开始小步渐进逐步延长劳动者的退休年龄,并研究建立更加人性化的弹性退休制度.     

Model test study on surrounding rock deformation and failure mechanisms of deep roadways with thick top coal

The deep roadway with thick top coal is a typical roadway difficult to support in deep mining project, and resolving this sophisticated problem to control the stability of surrounding rock is of great significance in safety production of coal mines. In order to explore the surrounding rock deformation and failure mechanisms of such deep roadways, with Zhaolou coal mine in Juye mining area of China as the engineering background, a large-scale geomechanical model test was carried out. The displacement and stress evolution laws of surrounding rock supported by the pressure relief anchor box beam system were researched. Meanwhile, the related results validate and analyze main failure characteristics and mechanisms of the surrounding rock by comparing with field test.     

Effects of Coal Mining on Shallow Water Resources in Semiarid Regions: A Case Study in the Shennan Mining Area,Shaanxi, China

The Shennan mining area in northern Shanxi Province is located in a semiarid area where surface and near-surface water resources are very valuable. Mining-induced fractures can cause these shallow water resources to leak. The overburden strata were divided into engineering geology rock groups and a comparative analysis was calculated based on the height of the water-conducting fractured zone and the key stratum theory, using both an empirical formula and a fitting formula. The influence of coal mining on the shallow water resources was divided into four types: serious, moderate, slight, and no water loss. Finally, a water resource leakage differentiation graph was produced for the study area. The results can be used to guide coal extraction in the study area and to protect the area’s shallow water resources.     

主井装载电控系统改造应用研究

主井装载处于煤矿生产的关键位置,主井装载电控系统的安全稳定对于煤矿具有重大意义。本文针对济宁三号煤矿主井装载电控系统的软、硬件改造,系统分析了技术改造方案和控制系统设计,结合组合开关的应用,介绍了采用S7-300PLC作为主控的改造后装载控制系统,并对装载控制系统改造中应用的技术进行了研究和探讨。     

初冷系统的工艺改进

通过对初冷系统存在的问题进行分析,采取相应的工艺和设备改造措施,大大提高了初冷系统洗萘效率和煤气质量,各种工艺问题也得到了解决。     

基于Pro/E5.0软件的截割头设计

截割头是掘进机的工作机构,其主要的失效原因是截齿的损坏,因此对截齿进行科学合理的定位尤为重要。笔者在Pro/E 5.0软件环境中,利用骨架模型和族表等功能,对截齿座的各个定位参数进行调整控制,便于产品优化和载荷计算。     

掺烧煤泥型CFB锅炉脱硫系统优化与改造

针对440 t/h CFB锅炉SO2排放超标问题进行了研究,结合兖矿济三电力有限公司的实践,介绍了原石灰石脱硫系统存在的问题及优化改造情况,最终使SO2排放浓度控制在300 mg/m3以下,同时解决了石灰石系统堵管及下料不畅问题。     

焊接车间环境污染治理措施

介绍焊接车间环境污染的分类及危害,提出相应的治理方法.     

用于基因转运和治疗的多功能纳米复合物的制备及应用

基因治疗是将DNA转染进入目的细胞,修复遗传错误或者产生治疗因子。目前基因治疗研究的热点是利用纳米颗粒作为载体,将特异性基因转染到细胞内,从而达到基因治疗的目的。纳米颗粒作为载体可使基因的转染效率提高、增强其稳定性、靶向型。就纳米复合物的组成及在基因治疗方面的应用、面临的问题与挑战进行了综述。