超临界二氧化碳压裂技术实验研究综述

本文从超临界二氧化碳特点、超临界二氧化碳压裂岩体实验研究、压裂煤体研究以及超临界二氧化碳压裂现场应用现状进行了详细的调研总结,探讨了目前超临界二氧化碳压裂技术的研究进展与不足,并在起裂机理、裂缝扩展机理等方面的研究提出了建议,对超临界二氧化碳压裂技术未来的发展具有参考意义。     

燃煤发电机组运行过程中能耗及节能研究

超临界二氧化碳燃煤发电是一种高效、清洁利用的煤炭发电技术，具有广泛的应用前景。从能源和能量平衡2方面对超临界二氧化碳燃煤电厂与蒸汽朗肯循环电厂进行了比较研究，揭示了电厂内能量和〖XC<火用.eps>；%90%95，XQ；P〗的转换以及转移方式。当主要气体参数为32 MPa/620 ℃并采用二次再热工艺时，超临界二氧化碳燃煤电厂和蒸汽朗肯循环电厂的发电效率分别为4906%和4812%，相应的激发效率分别为4802%和4710%。研究揭示了超临界二氧化碳燃煤电厂的节能机理，超临界二氧化碳燃煤电厂锅炉系统的燃烧效率较低，使输送到超临界二氧化碳循环的能量水平高于输送到朗肯循环的能量水平，二氧化碳通过吸收高水平的能量，通过超临界二氧化碳循环产生更多的机械功率，以获得更高的功率效率。     

超临界CO2钻井技术研究

超临界二氧化碳流体兼有液体的高密度和气体的低粘度、高扩散系数的特点,采用超临界二氧化碳作为钻井液进行钻井作业能够提高钻井速度,同时有效地保护油气层。介绍了超临界二氧化碳的性质,并对其在钻井过程中的应用进行了分析,指出利用超临界二氧化碳作为钻井液的优点及不足。     

我国启动页岩气资源高效开发基础项目研究

<正>《煤炭信息》周刊2014年第8期报道,国家973计划"超临界二氧化碳强化页岩气高效开发基础"项目日前启动,武汉大学为该项目的第一承担单位,将与重庆大学等7家相关单位联合开展研究。该项目将通过超临界二氧化碳破岩、压裂增渗、置换页岩气机理等方面的基础理论研究与关键技术攻关,最终形成超临界二氧化碳强化页     

超临界二氧化碳对煤体增透的作用机理及影响因素分析

在如今的双碳背景下，超临界二氧化碳压裂技术不仅能增透煤体，还能用于地质封存二氧化碳，因此其在煤炭领域越来越受到重视。然而超临界二氧化碳对煤体增透的作用机理和主要影响因素尚未明晰，故为掌握其作用机理，探究其主要影响因素，进行了数据处理和总结分析。首先，明确了超临界二氧化碳对煤体增透的作用机理主要包含3个方面：对煤体微观组分的改造作用、对煤基质的溶胀效应以及对煤中瓦斯的驱替作用。其次，阐述了影响超临界二氧化碳增透煤体的主要因素包含作用温度、作用压力、作用时间和煤体含水率，并得到了主要因素与煤体特性之间的关系：煤体孔隙率和渗透率会随着作用温度的升高而降低，随着作用压力、作用时间和煤体含水率的增加而增大，且其与作用压力和短时浸泡时间皆符合正指数函数关系；煤体力学强度会随着作用时间和含水率的增加而逐渐弱化，且抗压强度、弹性模量和抗拉强度与作用时间皆符合负指数函数关系。最后，对超临界二氧化碳增透煤体所存在的问题进行了探讨，指出现今研究忽略了浸泡次数对超临界二氧化碳增透煤体效果的影响，以及缺乏对主控因素和最佳增透条件的分析，可以仿照循环液氮致裂试验来进行超临界二氧化碳循环浸泡次数研究，可通过正交实验...     

基于蒸发壁反应器的超临界水氧化技术研究进展

超临界水氧化技术的发展面临着腐蚀和盐沉积两大技术难题,采用蒸发壁反应器是解决这两大技术难题最为有效的方法。本文综述了国内外蒸发壁反应器的结构特点和性能,分析了基于蒸发壁反应器的超临界水氧化技术应用过程中仍然存在的问题,如多孔管的性能、物料的预热、系统能量利用及经济性,并提出了相应的解决办法。     

25-20型奥氏体钢在650 ℃超临界水中的腐蚀行为研究

为了解奥氏体耐热不锈钢HR3C、NF709R和SAVE25在服役条件下的抗蒸汽腐蚀性能, 研究了3种材料在650 ℃/25 MPa超临界水中的腐蚀行为。采用SEM、XRD分析了氧化膜的表面形貌、成分分布和物相, 结果表明, 3种材料在超临界水中均具有良好的抗腐蚀性能, 因NF709R含有较多的Mo和Ni, 生成的FeMo₂O₄减缓了Fe的扩散, 有利于降低氧化速率, 同时由于Ni可提高氧化膜的稳定性和抗腐蚀性能, NF709R耐腐蚀性能优于HR3C和SAVE25。     

超临界二氧化碳中铀(Ⅵ)—磷酸三丁酯(TBP)络合物的分光光度测定

《Talanta》1998年第46卷第4期发表了SasakiT．等人关于以分光光度法测定超临界二氧化碳中铀（Ⅵ）-磷酸三丁酯（TBP）络合物的文章。文章首先报道了超临界二氧化碳萃取在重金属元素分离方面的应用。由于超临界二氧化碳流体具有溶剂损失量小、操作手续简便、容易回收、无?..     

石墨烯/锌基复合材料在模拟体液中的腐蚀行为研究

石墨烯增强锌基复合材料具有良好的力学性能,有望作为可降解医用植入材料用于人体骨骼修复。为了明确石墨烯添加对锌基复合材料降解行为的影响,本文采用电化学方法和浸泡法对比研究了纯锌、石墨烯/锌基复合材料在人体模拟体液(SBF)中的腐蚀行为。结果表明随着石墨烯含量增加,试验材料的腐蚀速率加快,腐蚀形式以均匀腐蚀为主,腐蚀产物主要为ZnO。     

几种材料的腐蚀磨损研究

采用自制的腐蚀磨损装置,使用了失重法及E.G.&G.PARC公司生产的M351系统,对45~#、1Cr18Ni9Ti、Cr17Ni2等3种材料在不同转速下往10%H_2SO_4+10%Sic砂浆中的腐蚀磨损行为进行了研究,完成了腐蚀磨损过程中电位、极化阻率随时间变化曲线的测定。结果表明:腐蚀磨损共同作用给材科带来的破坏远大于两者分别作用的总和,在这个过程中,材料表面钝化膜的覆盖率、钝化膜与基体结合力的强弱、钝化膜的自愈能力以及SiC粒子的冲击强度是主要的影响因素。     

China rare earth market review

正November 21~30,2014Due to weak demand from downstream industries,transactions of rare earth in Chinese domestic market were inactive.It was difficult to sell any rare earth products except for dysprosium oxide and terbium oxide.Suppliers lost confidence in recent market.Demand for rare earth products was soft.Consumers continued to take a wait-and-see attitude.Rare earth export market remained slow.     

Current situation and future trend of China rare earth luminescent materialindustry(continued)

<正>Developing ecological lighting source The world is facing the big problem of energy shortage today and the contradiction between economy development and environmental protection is worsened.Therefore,people are more likely to choose an ecological light source that is more energy efficient and environmental friendly.The choice provides great opportunity for the development of rare earth optical material industry in China.The concept of green lighting positions rare earth luminescent material as a leading player in illumination market.The light source of both rare earth luminescent lamp and LED lamp is ecological and energy saving.This is why     

Galaxy Magnets achieved the net profit of 34.02 million yuan in the first six months of 2014

正Galaxy Magnet announced its financial results for the first half of 2014 on August 14.For the first six months ended on 30 June 2014,Galaxy Magnet achieved operation income of RMB 182.3 million,up8.40% over the same period of 2013,and the net profit attributable to the shareholders of the listed company of 34.02 million yuan,increasing 35.49% over the same period of last year.Stable performance increase was led by development of new customers and application market of magnets.     

Rare Earth Application in Steel in China

<正>China has rich rare earth resources.Output of rare earth and steel in China ranks the top first in the world.However,there is still certain distance between the steel produced in China and developed countries from the point of varieties and quality.China still has to import some types of steel.Improving the quality should be emphasiZed in future development of steel industry in China.Rare earth can be used to upgrade traditional steel     

稀散金属产业的观察与思考

分析了近年来国内外稀散金属产业的生产、应用、资源与市场状况.铟锡氧化物靶材、砷化镓晶片、锗红外材料、铼高温合金和硒在电解锰及玻璃的应用等已成为稀散金属的主要应用领域.稀散金属的产量快速增长达到历史高位而导致了市场的失衡.以GaInP_2/GaAs/Ge,CIGS和CdTe为代表的非硅系太阳能电池是稀散金属的新兴应用领域,将给稀散金属带来日益增长的需求.     

China rare earth market review

正November 1~10,2014Chinese rare earth market was still inactive.Demand for rare earth products was weak.Consumers took a wait-and-see attitude for lower price.As it was an off season for rare earth products,it was expected that prices of rare earth could continue turbulence at the bottom in short terms.Due to a sharp drop,demand for rare earth from downstream recovered.Affected by new energy vehicles,wind powder and energy-efficient appliances,production of rare earth permanent     

China rare earth market review

正August 1~10,2014 There was some good news in rare earth industry recently.Restructuring plans of rare earth groups led by Baotou IronSteel Group and Xiamen Tungsten Group respectively have been approved by MIIT.And rare earth storage policy,which had been expected for a very long time,has been launched officially.Pushed by the good news,rare earth price started to rebound since August 5.Price of didymium oxide and dysprosium oxide rose about 1% to 2%,averagely.About 10% of     

China rare earth market review

正July 1~10,2014Due to weak demand from downstream industry and slow transactions,rare earth market remained weak and price of rare earth products continued to decline.There was no sign of recovery in downstream market.The market of NdFeB magnetic materials and phosphor was depressed.Catalyst,     

New energy vehicle:an opportunity for rare earth magnets

<正>Extracted from Securities Guide 1.Popularity of new energy vehicles—an irresistible market trend1.1 Progress of new energy vehicles Chinese Premier Li Keqiang said recently on a visit to Xi'an BYD Autos that new energy vehicles,especially new energy bus,can lessen environment and noise pollution.He encouraged the use of new     

Brief news

正Corun invested another 50 million yuan in power battery for HEV Hunan Corun announced on 27 June that they had signed the cooperation agreement to jointly built Corun(Shaoxing)Autos Power Battery System Co.,Ltd.in Shaoxing Binhai New City.According to the announcement,total registered