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为了解决传统气体渗氮热处理存在的氮势、渗层深度不可控,以及工件表面脆白层、不锈钢表面钝化膜严重阻碍渗氮处理顺利实施等问题,研发了预抽真空井式可控气氛渗氮新技术.运行实践表明,新开发的预抽真空井式可控气氛渗氮新技术不仅氮势、渗层深度可控,而且工件处理品质好,再现性高. 相似文献
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纪方元 《小型内燃机与摩托车》1989,(3)
本文介绍了160系列柴油机球铁曲轴离子渗氮工艺,检测了曲轴渗氮变形量及渗氮层质量,进行了试样疲劳试验和曲轴耐久试验。结果表明,球铁曲轴离子氮化时间短、质量好,经此工艺处理的曲轴疲劳强度和耐磨性均有显著提高。 相似文献
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本文介绍了预氧化 热循环气体渗氮新工艺及原理分析。该工艺生产周期短,渗速快,是一种值得推广的气体渗氮工艺。 相似文献
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本文结合作者应用复合盐浴渗氮QPQ处理新技术的实际情况,综合阐述了国内外复合盐浴渗氮QPQ睡理新技术的起源和发展,扼要介绍了复合盐浴渗氮QPQ处理新技术的主要工艺性能特点、工艺情况和在国内许多行业领域的应用情况,指出了复合盐浴渗氮QPQ处理新技术的推广应用尚存在的问题和今后发展的方向。 相似文献
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本文针对国内离子渗氮炉存在的普遍缺陷:工作不稳定;温度不均匀;测温困难;能耗过多;用途有限。改进阴极和支座结构,增强隔热装置,附设加热器等对策,不但明显地改善了离子渗氮炉的使用性能,而且使之发展成为多功能的离子热处理炉,从而扩大了应用范围,挖掘了潜力,实现了一炉多用。经过198炉次的模拟试验和生产性工艺试验,证明改进后的设备基本上达到了预期目的,收到了良好效果,既能较为满意地完成离子渗氮等低温工艺,又可实现离子渗碳等高温工艺。 相似文献
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通过对离子渗氮法在齿轮制造过程中提高齿轮齿面强化的作用,工艺参数的选择对齿面影响的介绍,来进一步理解离子渗氮在齿轮加工中的作用及离子渗氮的优点。 相似文献
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本文介绍了利用UNIC箱式滴控炉对GCr15钢精密偶件进行淬火所取得的效果,说明了偶件在可控气氛保护下加热淬火的优越性。并对如何正确合理地制定箱式滴控炉偶件热处理工艺参数进行了论述,对热处理过程中应注意的问题和出现的现象,进行了讨论说明。 相似文献
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SMART (system-integrated modular advanced reactor) is a small-sized advanced integral reactor with a rated thermal power of 330 MW. It can produce 100 MW of electricity, or 90 MW of electricity and 40,000 t of desalinated water concurrently, which is sufficient for 100,000 residents. SMART technology is a sensible mixture of new innovative design features and proven technologies through a PWR. The enhancement of safety and reliability is realized by incorporating inherent safety features and reliable passive safety systems. The improvement in the economics is achieved through system simplification, component modularization, construction time reduction, and increased plant availability. All technologies and design features implemented into SMART have been proven in industries and/or qualified through the SMART design verification program including comprehensive test and experiments. The full scope of the safety analyses carried out to confirm that the inherent safety-improvement design characteristics and safety systems of SMART ensure reactor safety. After a thorough licensing review, SDA (standard design approval) for SMART was granted on July 4th, 2012 by the Korea NSSC (Nuclear Safety and Security Commission). This marks the first license for an integral-type reactor in the world. This paper presents the SMART characteristics, safety features and technology validation. The licensing process of SMART is also described. 相似文献
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Gunter Schneider Hartmut Maier Dominik Schlipf 《能源与动力工程:英文版》2014,(5):876-881
In order to optimize the electricity yield of CSP (concentrated solar power) plants, TES (thermal energy storage) systems are regarded as an essential component. Furthermore, for many electricity grid operators, it is important to have spinning reserves in the grid and dispatchable power available, both offered by CSP-plants with integrated thermal energy storage. Enolcon is developing a new TES-system since several years. The system itself was designed to offer a principle simple and robust setup (with regard to execution and operation) and which is reducing the electricity costs of CSP-power plants by the consequent use of state of the art technology. Furthermore, such system shall be open to future developments of CSP-systems with regard to increasing steam temperatures and steam pressure. Such TES-system shall be commercially available for large scale application already in year 2014/2015. The key elements of the enolcon-TES are the open cycle using always ambient air with an air-air-heat exchanger and the arrangement of the storage material in such way to minimize the pressure losses and the own electricity consumption. The development is progressing in a structured way by studies, engineering works, TES-pilot plants, isothermal air flow test plant for the verification of the CFD-calculations, and since end of 2012 by the operation of a high temperature TES-module with all features of the large scale modules. 相似文献
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Hiroshi Hamasaki 《能源与动力工程:英文版》2014,(2):217-225
This study aims to illustrate the Japanese electricity supply system after the earthquake with consideration of Japanese uniqueness including its 10 separate grids with weak connections between them and the geographical gap between renewable potential and electricity consumptions using GIS data for a TIMES model. We take FIT (feed-in-tariff) as a policy measure to promote renewables. To consider policies to promote renewables, we need a modelling approach where the electricity system of the entire country is represented with extremely disaggregated information on existing stock and future potentials of renewables. By building up technology models based on detailed disaggregate information on existing stocks and future potentials of renewables at the sub-regional level, we can develop renewables-related policies which reflect more realistic conditions. According to the simulation results, high FIT prices do not guarantee more introductions of renewables. High FIT prices make the huge potential of renewables commercially viable, but at the same time, they limit the maximum introduction of renewables. In addition, a high FIT budget does not guarantee more renewable introduction. 相似文献
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The high-performance CPC-trough (compound parabolic concentrator) collector has been developed for the utility scale generation of low temperature solar steam and hot water for low temperature process heat applications including solar air conditioning. With an optical concentration of 7.5:1, operating temperatures over 130 ℃ may be reached. This novel design has included a FEM (finite element modeling) validation and is compatible with the standard reflectors and evacuated tubes in the market. The peak efficiencies of 35% with unshielded and more than 45% with evacuated tube receivers were obtained. This CPC-trough collector requires intermittent tracking, i.e., tilt adjustment is only once in a week for more than eight hours collection in summer and six to seven hours in winter seasons. 相似文献
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Igor Loktev Yuriy Goncharov Aleksandr Basihin Michael Zarubin Aleksandr Strukov 《能源与动力工程:英文版》2014,(5):852-856
The purpose of given article-consideration of the basic features of modern manufacturing of nuclear fuel which would confirm fact, that the manufacturer does everything that its production would respond not only to requirements of the consumer, but also to its expected inquiries, and would correspond to intended purposes of fuel. It was defined main tendencies and features of modern technology, especially in nuclear fuel production, on base of meeting discussions, themes of journal articles on nuclear subject. They are correspond with practice of JSC NCCP (Novosibirsk Chemical Concentrates Plant) and listed in the paper. In result of it number of base features of any advanced technology, not only nuclear, described here with examples from NCCP's practice. Of course, there is no certain list of all attributes of modern manufacturing as there is no limit to its perfection. These categories are forming by current needs of the market, but listed ones must be. 相似文献
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Ling Dong Xinxing Liang Qiang Song Gewu Gao Lihua Song Yuanfeng Shu Xinqian Shu 《热科学学报(英文版)》2017,26(6):570-576
Coal gangue was calcinated under air, nitrogen, carbon dioxide, air–hydrogen, and hydrogen atmospheres. The effects of different calcination temperatures and atmospheres on the mineral composition of activated coal gangue were investigated by X-ray diffraction. Moreover, the acid leaching kinetics of aluminum oxide from coal gangue was investigated with sulfuric acid. It showed that the air atmosphere promoted kaolinite decomposition during coal gangue calcination. The hydrogen atmosphere promoted the activation and decomposition of kaolinite at reaction temperatures exceeding 650°C. The carbon dioxide atmosphere eliminated the influence of residual carbon on coal gangue. When the ratio of acid/coal gangue was 1.5 and reaction temperature was 650°C, the sulfuric acid leaching rate under air, air-hydrogen, carbon dioxide, hydrogen and nitrogen atmospheres were 93.66%, 90.90%, 84.06%, 81.91% and 77.54% respectively. The acid leaching reaction process conformed to unreacted shrinking core model of particle unchanged, and was controlled by the interfacial chemical reaction. The reaction kinetic equation for the leaching process was 1-(1-x)1/3=kt with an apparent activation energy of 48.97 kJ/mol. 相似文献
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CHEN Zhangzong YUAN Xujun WEN Meisheng CHEN Mingfeng HUANG Lianyou ZHANG Shilong YING Jierong 《储能科学与技术》2014,3(6):620-623
本文采用共沉淀法制备球形Ni0.80Co0.15Al0.05(OH)2.05前驱体,经预氧化后,采用富锂配比在氧气和空气气氛下烧结合成LiNi0.80Co0.15Al0.05O2正极材料.用X射线衍射,扫描电镜和恒电流充放电测试等方法对该材料的结构,形貌及电化学性能进行表征.结果表明:当锂配比为1.15时,氧气和空气中烧结合成的LiNi0.80Co0.15Al0.05O2正极材料的形貌,结构和电化学性能相当.富锂配比方法可在空气气氛下制备出电化学性能优异的LiNi0.80Co0.15Al0.05O2正极材料.0.1 C放电克比容量在200 mA·h/g以上,首次效率在87%左右;1 C放电克比容量在168 mA·h/g以上;800周循环容量保持率在80%以上. 相似文献