基于双尺度低NO_x燃烧技术的电站锅炉改造

近年来环境污染问题日益严重,其中电力企业在NOx排放方面对环境的污染尤为突出。为减少环境污染,针对某电厂原有锅炉进行燃烧器的改造,以降低电厂NOx的排放。依据设计方案,以基于炉膛空间尺度和煤粉燃烧过程尺度的双尺度低NOx燃烧技术,对电厂燃烧器进行改造。改造结果表明:基于双尺度低NOx燃烧技术改造后的电站锅炉,其NOx的排放显著降低。     

低氮燃烧改造在亚临界机组的应用研究

为满足国家环保政策对火电厂氮氧化物排放要求,在运机组采用"先降后脱"的脱硝原则,文章介绍了贵州黔西某电厂利用机组进行B级检修时,完成了低氮燃烧器改造。通过主喷嘴局部改造,增加燃尽喷嘴,保证了锅炉效率,降低了NOx排放,实现了低氮燃烧改造在亚临界机组的有效运用。     

双尺度低氮燃烧技术在600MW燃煤锅炉上的应用

文章分析了某电厂600MW机组燃煤锅炉的低氮燃烧技术改造,改造采用双尺度低氮燃烧技术,使其同时兼备稳燃、低NOx、防结焦及防高温腐蚀等多重功能,NOx的削减率达到66%以上,飞灰可燃物没有明显升高,结合运行方式的调整解决了长期运行过程中高负荷大量结焦的问题,取得了积极效果,对类似工程有借鉴意义。     

600 MW锅炉空气分级燃烧温度场特性研究

600 MW锅炉采用空气分级燃烧技术后,炉内温度场发生很大变化,主燃烧区域温度降低,火焰中心上移。通过数值模拟等手段,分析空气分级燃烧技术对炉内温度场的影响、沿炉膛水平和高度方向的热负荷分布特性、锅炉屏底烟温的影响,以及对锅炉汽温的影响,通过采取有针对性措施取得较好效果。     

锅炉燃用神华煤低氧燃烧可行性研究及应用

在理论分析的基础上,重新认识燃烧神华煤的电站锅炉发生结渣和烟气气氛的关系,通过试验的方法,在不影响锅炉安全运行的基础上,研究低氧量气氛中燃烧神华煤的可行性,以降低由于富氧量燃烧造成的风机单耗增大、排烟温度升高等效率损失,减少NOx排放,提高锅炉运行的效率。     

XNS5520型焙烧炉燃烧系统改造

XNS5520型焙烧炉燃烧系统存在工作时无法启动点火程序、点火电极工作异常、空气伺服电机及电离电极工作异常问题，阐述改造方法、新系统工作原理及改造效果。     

神华“燃用神华煤电站锅炉安全高效超低NOx燃烧技术”达到国际领先水平

正近日,神华集团科技项目"燃用神华煤电站锅炉安全高效超低NOx燃烧技术研究及应用"项目通过电机工程学会鉴定。"燃用神华煤电站锅炉安全高效超低NOx燃烧技术研究及应用"项目在NOx燃烧技术的开发上取得了重大技术突破,在确保锅炉参数稳定、不降低锅炉效率的前提下,锅炉省煤器出口的NOx排放指标达到国际领先水平。     

燃油燃气锅炉低氮燃烧及能效提升工作

工业锅炉属于高排放和高耗能的产品,对于国家节能减排工作的开展造成挑战,当前已逐渐成为各职能部门关注的对象。文章以燃油燃气锅炉为研究对象,通过分析锅炉低氦燃烧与能效提升的途径来控制NOx的排放量,提升锅炉设备的运行效率,减少能源的消耗量,提升行业经济效益。     

工业锅炉燃烧系统优化控制

本文在工业锅炉燃烧系统中采用固定风煤比加变氧量校正和动态自寻最优控制并存的燃烧控制方案,克服了根据经验获得含氧量给定曲线所带来的片面性,克服了静态导优计算瞬时热效率所带来的问题,运行结果表明对提高锅炉的热效率和稳定性有明显的效果,获得了显著的经济效益。     

链条锅炉加煤粉复合燃烧技术

链条锅炉加煤粉复合燃烧技术,主要是为强化链条锅炉内的燃烧过程,提高链条锅炉对煤种的适应性而研制的。 一、链条锅炉的燃烧特点 链条锅炉是一种单面引燃的炉子,链条炉排不断地循环转动,把煤斗的煤带进炉膛内的炉排上,煤层随着炉排不断地从炉前向炉后移动,并在移动中依次进     

Divergent patterns of engagement in Internet standardization: Japan,Korea and China

This article analyzes the engagement of Japanese, Korean and Chinese participants in the development of Internet standards at IETF on the basis of four quantitative metrics: attendance, patenting, authorship and leadership. The results are strikingly divergent. Japanese involvement in Internet standardization began early and Japan was, for many years, second only to the U.S. in terms of IETF participation. Though Japanese participation has declined since the early 2000s, Japan remains a major contributor to IETF standardization. Korean involvement in IETF has always been significant, but below the levels of Japan and major European countries. Korean participation in IETF has also declined over the past decade, and has been dominated by one firm, Samsung. Though meaningful Chinese involvement in IETF did not begin until the mid-2000s, it has rapidly expanded in recent years. Today, China is a major player in numerous areas of Internet standardization in terms of three metrics (participation, patenting and leadership), and is rapidly gaining in terms of document authorship as well. Most of China׳s recent IETF involvement can be attributed to Huawei, though other Chinese firms have recently begun to increase their participation in the organization. Thus, contrary to some views that China׳s engagement with standardization is primarily one of indigenous innovation and “catching up”, China׳s experience with IETF demonstrates deliberate and effective engagement with a major Western standards-development organization on its own terms.     

增强Linux系统安全性的措施

L inux系统的安全取决于系统管理员如何来管理它。本文探讨了一系列可以增强安全性的技巧与策略 ,包括 :系统安装原则、BIOS安全、口令安全策略、设计帐户自动注销功能、文件系统和日志安全策略、使用 SSH及 TCP-WRAPPERS,隐藏系统信息、删除所有特殊帐户、关闭控制台程序、限制系统中的 SUID/ SGID程序等。本文最后向 L inux系统管理员提出了一些安全管理方面的建议     

Whose Image is it Anyway?: Some Considerations of the Curricular Importance of Subject Image in Secondary School Design and Technology Education

This paper explores the idea that a sense of school subject image is a necessary feature of curriculum management and a potent force for change. The discussion centres on the view that all school subjects have an image and that if those intimately involved with the subject do not control the image then someone else does! In such circumstances the image is the product of past encounters and old euphemisms and is unlikely to hold the changed realities.The UK developments in Design and Technology education (the term Design and Technology is used to denote the school subject defined under this heading by the UK National Curriculum, 1995) have created something of an image problem which has interesting international parallels. Some of these problems are due to clearly discernible internal tensions and an ambiguous relationship with other subject areas.Through greater attention to subject image internal controversies might be acknowledged and resolved, relationships with other subject areas can be more meaningfully understood and practitioners can be helped to make sense of curriculum change.     

快速成形技术的应用及热点分析

基于快速成形技术的原理,展示了快速成形技术在快速模具制造、金属零件直接成形、反求工程等领域的广泛应用,总结了快速成形制造技术研究的热点,即研发新材料和新设备、提高成形精度、建立RPM的反求工程系统、建立成形技术的统一标准和扩大成形技术的应用领域。     

CIS与现代企业管理美学

概括性介绍了 ＣＩＳ（Ｃｏｒｐｏｒａｔｅ Ｉｄｅｎｔｉｔｙ Ｓｙｓｔｅｍ）的三大基本组成，并阐述了它与现代企业管理密不可分的相互联系及所处的举足轻重的地位，指出导入ＣＩＳ是现代企业谋求发展的重要手段。     

HSE走进中国石油

企业管理水平的好坏直接影响着企业的经济效益,运用HSE管理能提高企业管理水平,HSE管理模式将健康,安全,环境三者视为一个有机的整体。HSE管理认为人的安全是第一位的,人是创造财富的原动力,是企业的最大财产,HSE管理体系强调的是“蝴蝶效应”。     

Diffusion and usage of public e-services in Europe: An assessment of country level indicators and drivers

We analyze the state of the art of indicators on e-government, e-health, e-procurement and e-participation. We survey the main methodological properties of these indicators, and highlight their heuristic potential. Further, we address empirically the issue of the explanation of the availability scores, i.e. how the supply of the various e-services in each country is affected by political, institutional and socio-economic differences, and is followed by actual usage. The econometric analysis uncovers the importance of broadband penetration and higher education as drivers for most of the types of e-services and users (citizens and businesses). Moreover, a corruption-free and agile public sector proves to be an important pre-condition for more effective supply and usage. Despite data limitations and the complexity of the underlying diffusion phenomena, our study is the first truly longitudinal contribution aimed at disentangling the common drivers of such an important phenomenon – the e-services availability and usage across European countries. As such, this work appears useful to inform the policy debate and practice, in a phase characterized by a prospective reorientation of the public e-services provision and policy agenda.     

一种高精度的频率标准比对系统

频率标准源可以提供精确的标准频率,在测定频率标准源的各项性能指标时,要求测试系统必须具有很高的比对精度。所设计的频率标准比对系统采取多级倍频 混频方式使频率偏差逐级扩大后再测量,从而避免了直接进行高次倍频的困难,提高了测量精度,可以对高精度的频率标准的准确度、长短期频率稳定度进行快速测量,是一种高精度时畴参数测量系统。     

Material power and normative conflict in global and local agrifood governance: The lessons of ‘Golden Rice’ in India

This special section aims to investigate the interaction of global and local forces in shaping agrifood governance. It starts from the recognition that a multitude of actors and norms shape today’s agrifood system. The resulting opaqueness of the systems makes it extremely difficult to understand and explain processes and outcomes of agrifood governance. Given the sustainability challenges facing the agrifood system, improvements in our understanding of what the interaction of global and local actors and norms means on the ground are urgently needed, however. The section, therefore, analyses agrifood governance in India across a selected group of cases. It does so by employing a systematic framework emphasizing the material and ideational dimensions of power and their interaction. The section has chosen India as the setting in which to analyze this interaction due to the crucial role the food demand and supply of this rising power plays in today’s agrifood system. This article provides the special sections’ analytical framework, which uses the interplay of material and ideational dimensions of power as a focal lens. In addition, the article applies this framework to an empirical study of the political conflict around GMO foods in India, specifically the case of ‘Golden Rice’.     

蒸汽热量计量应用的探析

研究了石油化工企业的燕汽计量情况,着重对蒸汽热量计量的合理性进行了分析,阐述了蒸汽热量计量的依据及计算方法,以及蒸气热量计量对节能降耗的重要意义.