共查询到20条相似文献,搜索用时 196 毫秒
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本文首先介绍本次弃渣场现状调查概况,然后统计分析46个弃渣场资料,获得以下认识:目前约有65%的弃渣场由电站自行管理,其余已移交当地政府;约70%弃渣场的护坡、截排水及拦档等设施均处于正常状态;其余30%的弃渣场局部有变形或者损坏或严重损害,或拟申请经费进行相应的治理;应重视筹建期和基建期弃渣场勘测设计和管理标准,在设计时考虑自动监测设施、巡检便道的布设和设计,并预留相应的费用;观测和监测设施尽可能采用先进、可靠的自动化采集设备。上述认识对类似工程具有一定的借鉴作用。 相似文献
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关于镍渣提铁生产的高温热能利用的探讨 总被引:3,自引:0,他引:3
通过对镍弃渣的性能分析,提出了两种利用镍弃渣生产微合金铁的方法,既可以解决镍渣中铁和有价金属的回收,达到资源综合利用的目的,又解决了高温熔融镍渣的热能回收问题,节约能源。 相似文献
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镇安抽水蓄能电站弃渣坝体型复杂、弃渣量大且坝坡上建有永久上坝道路,为了保证弃渣坝的安全稳定以及上坝道路的交通安全,该文结合弃渣坝体型结构、施工计划与弃渣种类,采用有限元分析法进行弃渣坝的分区设计。通过对弃渣坝进行合理分区,将坝体分为上游上坝坡、上游下坝坡、路基、下游坝坡4个区域,经过变形与稳定性分析得出:采用覆盖层渣料填筑于上游上坝坡,以及使用模量较高的风化层渣料填筑其余区域的分区方案,则弃渣坝稳定性较高、永久道路的变形量较小,从而使弃渣坝整体安全性与可靠性较高,说明该方案具有较大合理性。 相似文献
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Iran's oil and gas industry requires investments of US$ 15 billion in the short term and over US$70 billion in the medium term. Iran tries to interest international oil companies (IOC) in investing in Iran's oil and gas business by offering buyback contracts. Under a buyback contract an IOC invests and when production starts, the field is handed over to the National Iranian Oil Company (NIOC) or one of its representatives. The IOC gets its costs and an agreed upon profit paid out of the oil and/or gas gross profits, assuming the field produces as agreed upon and the international energy prices are high enough. According to the Iranian government, the buyback contract contains sufficient incentives for an IOC to invest in Iran. The IOCs, however, disagree. They claim that they solely bare the risks in a buyback contract, whereas the Iranian counterpart receives all windfall profits. Furthermore, the IOCs claim that the utilisation of Iran's oil and gas reserves will be sub-optimal if they are not involved in optimising long-term recovery. In this paper, we investigate these claims and show that they are partly correct. Given Iran's need for investment capital, Iran might have to change its policy. 相似文献
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为解决上游串联双调压室系统中调压室稳定断面面积设计的问题,基于托马假定,推导了串联双调压室系统的特征方程,根据霍尔维茨稳定判据得出了上游串联双调压室系统调压室临界断面面积的稳定域,并分析了串联双调压室系统稳定域的变化规律。结果表明,串联双调压室系统稳定域边界线由两条交于一个拐点的曲线组成,在拐点处靠近机组的调压室有最小临界稳定断面面积。最后,推导得出了串联双调压室系统稳定域边界线拐点的解析计算公式,提出了串联双调压室系统调压室临界断面面积的设计原则,为串联双调压室系统调压室临界断面面积的计算提供了理论依据。 相似文献
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介绍小浪底大型水电站进口水轮机叶片裂纹的发现、原因分析和相关试验以及处理措施的全过程,并概述了由此引发的合同争议和索赔的处理过程及采用的策略,可为国内进口机电设备合同的执行及后期争议处理提供借鉴。 相似文献
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The effective thermal conductivity of a metal hydride packed bed was calculated by considering the influence of expansion during hydrogen absorption and contraction during hydrogen desorption. The porosity was calculated using an experimental formula developed by direct observation, which was used in combination with other referenced methods. However, none of the methods could express the reported experimental value response to pressure change using only the experimental porosity formula. The area contact model was modified so that the porosity and the contact area changed with expansion and contraction. The contact area change was calculated by assuming a simple geometrical deformation caused the difference between the particle expansion and the packed bed expansion. The calculation results of the improved area contact model with the deformed factor and the shape factor were in good agreement with the reported experimental data. This calculation method of the effective thermal conductivity with the influence of expansion and contraction is expected to be useful for designing of heat transfer enhancement of a hydrogen storage tank. 相似文献
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Kong Xujing Wang Youchun Zhang Shufei Xu Hongkun Institute of Engineering Thermophysics Chinese Academy of Sciences P.O.Box Beijing China 《热科学学报(英文版)》1992,1(2):130-134
A physical model has been constructed to represent the condensate film pattern on a horizontal downward-facing surface with fins,which is based on visual observation in experiment.The results of analysis using thismodel confirms the validity of the critical wave length formula obtained from Rayleigh-Taylor stability analysis.This formula may be used as a criterion to design horizontal downward-facing surfaces with fins that can bestdestabilize the condensate film,thus enhancing condensation heat transfer. 相似文献
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气象资料匮乏地区参考作物需水量的一种简化算法 总被引:3,自引:0,他引:3
为计算气象资料匮乏地区的参考作物需水量,以新疆额敏灌区为例,分别采用Penman-Monteith方法和Blaney-Criddle方程计算参考作物需水量旬变化过程。结果表明,两种方法计算参考作物需水量均呈抛物线变化规律,5月前变化趋势一致,5月后变化过程差异较大。以Penman-Monteith方法计算结果为标准,采用回归分析方法修订了Blaney-Criddle方程,应用表明修订方程可较好地模拟灌区参考作物需水量变化过程。 相似文献
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为解决目前输电塔原状土基础采用剪切法抗拔计算中系数A1和A2的取值问题,依据土力学理论建立抗拔土体极限平衡方程,基于Mohr-Coulomb屈服准则,推导剪切法抗拔计算中系数A1和A2的理论计算公式。重点探讨系数A1和A2的取值特征及其随内摩擦角准和基础深宽比H/D的变化规律,通过与规范(DL/T5219-2005)和技术导则(Q/DG2-T03-2007)送审专题报告进行对比分析,讨论了抗拔承载力计算可能存在的问题,得到一些关于系数A1和A2的取值结论,可为工程设计提供参考。 相似文献