共查询到20条相似文献,搜索用时 171 毫秒
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应用直接空冷系统的空冷电站,在夏季极端高温条件下运行时机组性能会明显下降。在空冷单元中添加喷雾冷却装置能够极大改善空冷机组的运行特性。本文设计一套将喷雾增湿与蒸发冷却技术相结合的新型空冷喷雾装置。采用数值模拟与实验相结合的方式分析添加该喷雾系统后空冷单元的运行特性。结果显示该新型系统的空气降温与汽轮机背压降低效果良好。对应用该喷雾技术后的工程实例进行分析,实际运行情况表明该机组在夏季极端高温条件下运行良好,且耗水量被控制在理想的范围内。 相似文献
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《中国新技术新产品》2014,(1)
本文分析现有电站直接空冷系统夏季高负荷的原因,并提出了几种解决方案,其中针对蒸发式空冷器做出了详细介绍。概述了蒸发冷却技术的工作原理,并详细介绍了直冷系统中并联蒸发式空冷器的工艺流程,及蒸发式空冷器在直冷系统中起到的关键作用,同时也提出了采用这种复合式空冷系统还需要进一步解决的问题。 相似文献
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目前,我国大多数发电厂都采用了湿冷技术,面对着日益紧缺的水资源问题,发电行业面临了前所未有的挑战,对于空冷技术来说,可以节水2/3。国内直接空冷电站发展空前迅速,但是否过热的问题仍是值得注意的。 相似文献
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由于我厂空冷散热面积不足,夏季高温时,存在低真空严重限负荷问题,加装了喷淋装置后这一问题得到有效缓解。本文将对空冷喷淋装置进行介绍并且在实际应用中对其效果进行论证。 相似文献
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本文详述了330MW直接空冷机组冬季机组运行与启停的防冻技术措施,凝结水溶氧的影响因素,以及夏季降低背压的措施。 相似文献
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高正斌 《中国新技术新产品》2012,(13):155-156
直接空冷系统在火电厂设计中是一个非常重要的设计技术,因此,对火电厂空冷系统节能改造及优化运行的关键问题应进行深入研究,确定空冷机组的优化运行方案,对于提高我国空冷机组的国产化水平,实现火电厂节水和节能降耗,保证空冷机组安全、高效运行具有重要意义。 相似文献
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我国华北、西北、东北地区普遍寒冷缺水,电站建设往往受制于水源。作为一项在富煤缺水地区很有前途的生产方式,空冷技术已经显示出巨大的发展潜力。空气冷却分为间接冷却和直接空冷两种,与间接空气冷却相比,直接空冷机组更适于寒冷的地区运行,其最大特点是防冻性能好、节水、占地面积小、投资低、更环保。 相似文献
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淡水资源匮乏问题日益严重,火电厂耦合低温多效蒸馏(low-temperature multi-effect distillation,LT-MED)海水淡化技术因可有效降低制水成本而被广泛利用。利用Ebsilon软件对某电厂和低温多效蒸馏海水淡化耦合系统进行建模,分析了电厂宽负荷下蒸汽喷射器对水电联产系统热经济性的影响规律。研究结果表明:基于单级蒸汽喷射器的水电联产系统,以电厂75% THA工况设计下的蒸汽喷射器的性能最佳。对于带两级蒸汽喷射器的水电联产系统,当电厂负荷在75% THA工况时系统的制水电耗量相比单级蒸汽喷射器系统降低了13.65%,并且电厂负荷在50% THA工况以上时,带两级蒸汽喷射器系统的制水电耗量较单级蒸汽喷射器系统的低。 相似文献
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我国地热资源丰富,且分布范围广。随着能源短缺和环境恶化问题的出现,地热能作为一种可再生的清洁能源受到人们的广泛关注,并将其用于发电领域,以降低污染物的排放、减缓煤炭等化石燃料引发的温室效应,实现能源结构的优化。介绍了地热蒸汽发电技术、地热水发电技术、干热岩发电技术、岩浆发电技术等地热发电技术的工作原理,并在适用范围、发电效率、发电成本、优缺点等方面对其进行比较。同时,阐述了地热与太阳能、生物质联合发电技术;分析了地热发电技术中存在的问题,以期为地热能在我国乃至世界范围的实际应用提供参考。 相似文献
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在适当条件下,水孔预裂与扇形深孔相配合的爆破技术作为小型港口建设的新型施工工艺,可降低成本、减少投资、加快工期,具有显著的社会效益和经济效益。 相似文献
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The measurement of water vapor is important in many applications ranging from predicting changes in the weather to ensuring heating and cooling comfort in homes. In manufacturing, water vapor measurements help to control performance properties of engineered materials and optimize fuel efficiency in power generation. This paper presents a technology review of water vapor sensors and manufacturing techniques. Micromachining, more commonly known as MEMS or microelectromechanical systems, is an enabling technology based upon standard semiconductor manufacturing. MEMS technology makes possible solid-state sensors with greatly reduced power consumption and low operating voltage that are fully compatible with digital electronics and can be manufactured in high volumes at low cost. A water vapor microsensor just becomes another part on the circuit board. A "technology roadmap" for water vapor microsensors is defined where the sensing technologies have been organized into four major transduction schemes: capacitive, mass-sensitive, optical and resistive. Sensing element type, key geometric features and excitation scheme provides further classification. Operating principles and general performance characteristics are also presented 相似文献
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Carbon dioxide capture and geological storage 总被引:1,自引:0,他引:1
Holloway S 《Philosophical transactions. Series A, Mathematical, physical, and engineering sciences》2007,365(1853):1095-1107
Carbon dioxide capture and geological storage is a technology that could be used to reduce carbon dioxide emissions to the atmosphere from large industrial installations such as fossil fuel-fired power stations by 80-90%. It involves the capture of carbon dioxide at a large industrial plant, its transport to a geological storage site and its long-term isolation in a geological storage reservoir. The technology has aroused considerable interest because it can help reduce emissions from fossil fuels which are likely to remain the dominant source of primary energy for decades to come. The main issues for the technology are cost and its implications for financing new or retrofitted plants, and the security of underground storage. 相似文献
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Xiaorong Zhao Weili Cheng Hongjin Zhu Chunpeng Ge Gengyuan Zhou Zhongjun Fu 《计算机、材料和连续体(英文)》2020,64(2):1139-1151
With the development of the times, people’s requirements for communication
technology are becoming higher and higher. 4G communication technology has been
unable to meet development needs, and 5G communication technology has emerged as
the times require. This article proposes the design of a low-noise amplifier (LNA) that
will be used in the 5G band of China Mobile Communications. A low noise amplifier for
mobile 5G communication is designed based on Taiwan Semiconductor Manufacturing
Company (TSMC) 0.13 μm Radio Frequency (RF) Complementary Metal Oxide
Semiconductor (CMOS) process. The LNA employs self-cascode devices in currentreuse configuration to enable lower supply voltage operation without compromising the
gain. This design uses an active feedback amplifier to achieve input impedance matching,
avoiding the introduction of resistive negative feedback to reduce gain. A common
source (CS) amplifier is used as the input of the low noise amplifier. In order to achieve
the low power consumption of LNA, current reuse technology is used to reduce power
consumption. Noise cancellation techniques are used to eliminate noise. The simulation
results in a maximum power gain of 22.783, the reverse isolation (S12) less than -48.092
dB, noise figure (NF) less than 1.878 dB, minimum noise figure (NFmin)=1.203 dB,
input return loss (S11) and output return loss (S22) are both less than -14.933 dB in the
frequency range of 2515-4900 MHz. The proposed Ultra-wideband (UWB) LNA
consumed 1.424 mW without buffer from a 1.2 V power supply. 相似文献