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立井井筒装备下行一次竣工施工方法的实验与研究 总被引:1,自引:0,他引:1
立井井筒装备下行一次竣工施工方法的实验与研究七台河矿务局工程处李全立井井筒装备安装,传统的施工方法,大多为自下而上,多层吊盘作业,逐层一次竣工。少量分次安装,先自上而下安装罐梁、梯子间,再自下而上安装罐道及管路等,此两种施工方法,根据我们多年的施工经... 相似文献
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0 前言 立井井筒装备的安装,是立井施工中一项非常重要的工作,安装质量的好坏直接影响着井筒装备使用的可靠性.主要包括罐梁、罐道、梯子间、管路及电缆安装和敷设.井筒设备的安装就其工作的劳动量来说,一般不超过全部井筒施工的10%;可是安装准备期较长,安装工期也约占成井总工期的15%~20%左右. 相似文献
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越南下龙煤矿主井井筒掘砌到底后,井筒与巷道4个连接处和装载硐室施工时,以及井筒罐道梁、管道等装备安装时,需要将井筒十字中线向下移设。通过十字中线移设整体稳线测量技术的应用,在井下恶劣环境中,实现了井筒十字中线的高精度快速移设,取得了较好的技术经济效果。 相似文献
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立井钢丝绳罐道的使用与维护 总被引:1,自引:0,他引:1
1 概述 煤矿提升系统的正常运转,是保证生产顺利进行的至关重要的环节,而保持井筒装备的良好状态,对保证提升系统的正常运转起着不容忽视的作用。 目前井筒装备有木罐道、各类钢罐道、焊接组合罐道和钢丝绳罐道等类型。钢丝绳罐道最大优点为投资少、施工安装工期短,且更换方便、维护简单,经济效益好,已被广泛应用而取代木罐道和钢罐道。但钢丝绳罐道存在着张紧、稳罐、安全间隙及防腐蚀等一系列问题,都制约提升系统的正常运行。在此,将钢丝绳罐道的常见问题与产生的原因及钢丝绳罐道的使用与维护经验介绍如下。 2 钢丝绳罐道常见… 相似文献
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采用时-频分析技术,研究了徐州三河尖煤矿9202冲击矿压高危险工作面开采过程中卸压爆破微震信号的频谱特性,通过对微震信号的谱特性分析,进行卸压爆破效果的评价,从而为冲击矿压灾害动态防治效果的有效检验提供一条新方法。 相似文献
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刘广志 《探矿工程(岩土钻掘工程)》2002,(2):3-4
小时候父辈就教导 :国家科学技术不强 ,只能遭受外国欺凌。为了报效祖国 ,大学里先学航空想造飞机打日本 ,其实哪有那么简单。学了 2年多 ,没有经济来源 ,无奈只有放弃“上天”梦想 ,改为“入地” ,学了采矿工程。抗日战争期间 ,全国只有一个油矿 ,于是和 8位同学商议好 ,毕业以后 ,“西出阳关”去玉门。到了那里我们大吃一惊 ,所有的设备机器全是进口的 ,还有一批留学回国人员 ,唯一奇缺的是年青的学子。于是我们分到了钻井、采油、机械、炼油等部门 ,勤奋地学习了不少新知识。 相似文献
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Concerns about climate change and environmental consequences of increased levels of atmospheric CO 2 will require the power generation industry to reduce CO 2 emissions from current levels. Unfortunately, for reductions to have the desired effect they will have to be large. While the schedule of the Kyoto Protocol may appear daunting, in the long term mere compliance with the protocol will hardly change the rate of increase of atmospheric CO 2. There are, however, technical, economical and practical choices that will allow the industry to meet the requirements of protocol and ultimately stop the increase in atmospheric CO 2 without eliminating coal from the fuel mix. In this paper, we present a review of current and emerging technologies for CO 2 sequestration. We provide a summary of the underlying scientific principles and discuss the practical and economic aspects of sequestration technologies, which will allow continuing use of global coal resources with minimum or no impact on CO 2 levels in the atmosphere. 相似文献
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减振器速度试验台曲柄连杆机构的动平衡分析 总被引:1,自引:0,他引:1
介绍了减振器速度试验台的结构与原理,对其中的曲柄-连杆机构进行了动平衡分析,通过计算和分析比较,确定了平衡块的质量和位置,消除了系统整体惯性力,为确保该试验台的性能提供了保障。 相似文献
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Proper characterization of a dust suppressant represents a significant challenge. There has been confusion on what makes an effective dust suppressant. Many have argued that a dust suppressant must wet the material effectively and rapidly to control airborne dust. As a result, dust suppression studies have been heavily dependent upon laboratory wetting experiments such as contact angles, fine particle engulfment rates, and particle bed experiments to characterize dust suppressants. It has been believed that an effective dust suppressant should produce a low contact angle, and engulf particles rapidly thereby wetting the surface effectively and reducing airborne dust levels. However, these methods only characterize how the suppressant wets a given material, which does not directly correlate to the ability to suppress dust. Furthermore, a clear correlation between wetting enhancement and dust suppression has not been demonstrated. In order to address this gap, a novel dust tower was constructed which provided direct material dustiness measurements and allowed for a more realistic evaluation of dust suppressant effectiveness. This unit was able to clearly distinguish differences in dustiness that resulted from treatment of iron ore pellets with several different dust suppressant chemicals. 相似文献
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Beneficiation routes aimed at dephosphorisation of oolitic gravity magnetic concentrate and involving a combination of roasting, re-grinding, magnetic separation and water and acid leaching are investigated. Roasting was carried out at 900 °C for 1 h without or with lime or sodium hydroxide as roasting additives. When additives were used, cement phases of Si–Al–Na–Ca–O type were detected as well as the mineral giuseppettite. During the thermal process sodium silicate is liquefied and the newly formed phases coat the oolites and penetrate inside the cracks. Energy Dispersive Spectroscopy analysis has indicated that the zone surrounding the oolites consists of Na, Al and Si phases with part of phosphorus being captured there. As a result of the alkaline roasting, goethite is partly transformed to magnetite and this reduction is reinforced with an increase in sodium hydroxide dosage. Investigation of redistribution of phosphorous shows that it could be only partly separated if leaching is not accompanied by re-grinding and physical separation. The recommended dosage of the reductive agent for the final flowsheet is 8 mass% ratio to concentrate. Grinding to a mean size of 0.040 mm, with water and acid leaching and double magnetic separation creates conditions to obtain a high-quality iron concentrate with 65.97% Fe and recovery of 92.43%, with simultaneous decrease in the phosphorus content from 0.71% to 0.05%. 相似文献
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无烟煤气化型煤热强度测定方法的研究 总被引:1,自引:0,他引:1
对无烟煤气化型煤热强度的测试条件和方法进行了较为系统的,考察了加载速度、恒温温度、恒温时间、测试气氛、测定顺序等对测试结果的影响,提出了关于无烟煤气化型煤热强度的测试条件、方法及仪器设备,即恒温温度900℃、恒温时间45min、埋沙、加载速度10~15mm/min、马弗炉外测法,取6个煤球的平均值即为无烟气化型煤的热强度的测量值。 相似文献