凝泵高压变频器工变频切换改造相关问题讨论

介绍了上海吴泾第二发电有限责任公司对机2凝泵A高压变频器工变频切换改造的基本方案,阐述了电气一次回路、二次回路、DCS逻辑、变频小室冷却系统改造等过程中出现的问题和相关解决方案,为今后相似工程提供一些经验。     

MAXF高压变频调速装置在发电厂凝泵凝升泵上的应用

对发电厂的凝泵、凝升泵的高压变频改造进行了简要叙述，并对经济性试验的数据进行了定量分析。描述了实际调试运行中的一些问题进行分析和提出解决办法。     

凝结水泵变频运行节能改造实践

国电丰城电厂对4台机组凝泵变频改造后,机组低负荷阶段受给水泵密封水压力低的限制,未能充分发挥凝泵变频节能的效应。为此,该公司在给水泵密封水系统加装升压泵,通过调整凝泵运行方式,大大降低了凝泵的运行电流,实现凝泵变频的深度节能,提高了企业经济效益。     

高压变频调速装置在300MW机组凝结泵上的应用

结合张掖发电公司凝结泵变频改造项目,介绍了如何根据电厂有关系统的特点,使用高压变频调速装置对凝结泵进行变频改造。     

高压变频调速装置在300MW机组凝结泵上的应用

结合张掖发电公司凝结泵变频改造项目,介绍了如何根据电厂有关系统的特点,使用高压变频调速装置对凝结泵进行变频改造。     

变频技术在凝结水泵上的运用

大部分火电厂通过调节阀门或出口挡板实现截流调节,其不足之处是电力资源损耗较高,有必要进行变频调节改造。为此,以A火电厂为例,首先基于其机组凝结水泵变频改造需求进行了高压变频器选型;其次设计了高压变频器控制方案,并且分析了高压变频器控制系统投运流程,以期为变频技术在凝结水泵上的运用提高参考,从而节约凝结水泵运行电力资源,实现节能减排的凝结水泵变频改造改造目标。     

高压变频器特性及其应用

本文在探究高压变频器相关理论知识及其工作原理的基础上,梳理了高压变频器的重要特性,并对基于电动机稳态模型和电动机动态模型的高压变频器控制策略进行了分别探讨,对基于电动机动态模型的矢量控制、直接转矩控制和无速度传感器控制等进行了深度梳理,最后以转炉一次除尘3#风机高压变频改造为主要研究对象,探讨了高压变频改造方案、改造技...     

600MW超临界机组凝结水泵变频改造及节能效果分析

分析变频调速的节能原理,针对工况运行凝结水泵存在节流损失大等问题,提出进行高压变频改造;介绍变频器的特点、改造方案,指出应注意的问题,并对变频改造的节能效果进行分析。     

高压变频器在热电厂变频改造中的应用

分析了高压变频器用于热电厂变频改造中的节能原理,结果表明,对电厂风机设备进行变频改造后节能效果明显,并提高了设备和系统的安全可靠性,改善了电机和风机的使用寿命。     

变频控制在热电厂凝泵中的应用

介绍热电厂抽凝机组凝结水系统的概况及采用调节阀控制热井水位存在的问题，分析凝泵实施变频调节的可行性，比较各种控制模式的优缺点，指出凝泵变频改造项目安装调试的注意事项。运行实践表明“一用一备”控制模式是水泵节能改造的最佳方案之一，在该热电厂得到了推广应用，获得了较大的经济效益和良好的控制效果。     

在能源分析中采用等效电方法

本文分析了目前使用的"当量热值法"和"等价值法"两种能源换算方法存在的问题。其中,当量热值法只看能源所含热量大小,忽略不同能源的品位和做功能力的差别,而导致节能评价中出现谬误;等价值法在评价二次能源时考虑实际对应的一次能源量,但由于采用的是全国平均值,在面临实际问题时仍然不能明确给出各个环节的能源损失大小,而在评价一些能源转换环节时出现逻辑矛盾。为了解决以上能源核算和节能措施评价中的问题,本文提出一种综合了能源的数量和品位的"等效电法",某种能源换算为等效电,反映了其在当前工艺和技术水平下的最大做功能力。分析与大批实例表明,采用等效电法可以清楚地给出能源输送与转换各个环节的损失与流通状况,并能够满足能源统计平衡的要求,同时还可以对各种能源转换方式和用能方式做出较科学的分析评价。     

贵州生物质能的开发利用现状及发展前景

生物质能一直是人类赖以生存的重要能源,随着石化燃料的日益匮乏及环境污染的日益恶化,生物质的开发利用越来越受到世界各国的关注,发展生物质能产业对贵州经济可持续发展具有重要的意义。介绍了生物质能资源、特点及其开发利用技术,阐述了贵州生物质能的开发利用现状其发展前景,提出了贵州生物质能开发利用的存在问题及发展对策。     

Renewable energy — the way forward

This paper outlines the growing need of energy in the developing countries and the acute population growth, which will exceed 10 billion by the year 2050. It describes the achievement and progress made in geothermal, hydro-power, biomass conversion, solar thermal technology, wind energy conversion and the ever increasing usage of photovoltaics. The paper also addresses the barriers and problems which face renewable energy users and producers. It is evident now that global warming is setting in and is going to change the climate as well as the terrain of many countries unless drastic measures are taken. The recent Kyoto meeting emphasised the importance of limiting CO₂ emissions and to abide by some form of agreement to reduce emissions. Countries such as India, China and Indonesia, which represent nearly half the world's population, are actively involved in using renewable energy as the only means of sustaining their energy growth. It concludes that renewable energy penetration into the energy market is much faster than was expected a few years ago and by the year 2020, 10–15% of our prime energy will be met by renewable energy.     

生物质能的应用前景分析

生物质能是可再生能源的重要组成部分，生物质能的高效利用，对解决能源和生态环境问题将起到十分积极的作用。概述了目前生物质能的主要转换方式。化学转变中的液化、气化和热解技术是目前主要研究方向。通过液化、热解可以直接得到一些化工产品；通过气化可以得到合成气，可以用来合成氨或者甲醇。总之，通过这些转变不但可以得到一些化工产品，而且可以缓解化石能源桔竭带来的能源危机。     

企业能源审计与节能规划的研究

文章从中国能源审计与节能规划研究的现状人手,以攀枝花钢铁有限责任公司本部的能源审计和节能规划为研究对象,利用对企业生产现场调查、资料核查和炉窑的测试等手段,调查该公司的基本情况,分析该公司的管理系统、能源利用现状、能源利用水平,研究该公司在能源购人、能源加工转换、能源输送、能源使用四大环节中存在的问题,并指出其节能潜力,提出节能措施和建议。     

Grid power quality with variable speed wind turbines

Grid connection of renewable energy sources is essential if they are to be effectively exploited, but grid connection brings problems of voltage fluctuation and harmonic distortion. In the paper, appropriate modeling and simulation techniques are discussed for studying the voltage fluctuation and harmonic distortion in a network to which variable speed wind turbines are connected. Case studies on a distribution network show that the voltage fluctuation and harmonic problems can he minimized with the proposed power electronics interface and control system while the wind energy conversion system captures the maximum power from the wind as wind speed varies. The studies have also demonstrated the ability of the advanced converter to assist the system voltage regulation     

Comparative study in supplying electrical energy to small remote loads in Libya

The main sources of energy that might be available in remote low populated areas Libya are either diesel generating units or wind mills for water pumping. Several problems in the working performance of these two types of energy production may arise due to environmental conditions. The lack of qualified technicians for regular and emergency maintenance reduces the energy sources' availability. Direct conversion of solar energy can replace other ways of energy delivery or production, specially in this country where the solar radiation all over the year is relatively high. On the other hand the direct conversion of solar energy is relatively expensive, however the cost of erecting long feeders and supervising them may be much expensive than the usage of solar systems. This paper investigates the economics associated with either solutions of energy production. A case study is given in details to supply one of the remote areas with population of about 250.     

变频技术在凝结水泵上的应用

本文分析了威海电厂凝结水系统存在的能源浪费问题和变频节能原理,介绍了采用的变频器的结构和调节、运行中出现的问题及处理措施。通过节能效果分析,表明该项技术可以取得可观的经济效益,而且在电力工业中具有很好的推广价值。     

660MW超临界机组应用凝泵变频技术节能分析

文中主要阐述660MW超临界机组凝结水泵应用变频技术产生的节能降耗效果,同时结合神华河北国华定洲发电有限责任公司超临界机组凝泵变频装置实际应用经验,分析凝泵变频技术运行中存在问题与解决对策。     

Effect of leaching on the ash behavior of wheat straw and olive residue during fluidized bed combustion

Fluidized bed combustion has been proven to be an attractive method for the conversion of agroresidues to energy offering economical and environmental benefits. The low melting point ash of agroresidues cause a number of problems e.g., sintering, agglomeration, deposition, etc., which consist the main obstacles for economical and viable application of this conversion method. Leaching that is considered to be a low cost pretreatment technique for the elimination of ash related problems in biomass boilers studied here. The produced results clearly demonstrate that leaching could help significantly to reduce the ash related problems caused during the operation of fluidized bed combustors with biomass.