共查询到18条相似文献,搜索用时 156 毫秒
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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。 相似文献
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针对目前大容量高参数机组所具有的低压和中压凝结水系统在除氧器滑压运行的特点进行了管路特性的确定,并通过低压系统中工频凝结泵与变频凝升泵串联运行,以及中压系统中凝结泵变频运行的调节特性分析,给出了为保证系统设备所需最低压力和水泵最低转速的限制下两种系统更加合理的运行方式;以典型的300MW亚临界同容量机组为例进行能耗比较,为现行的低压凝结水系统是否有必要进行节能改造提供了可参考的理论依据. 相似文献
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为了进一步降低凝结水泵运行的厂用电率占比,解决超超临界机组参与电网深度调峰工况下凝结水泵变频控制节能效果受限的问题,通过在1 000 MW超超临界机组上开展现场试验并获取特性数据,针对当前运行现状提出一种适合深度调峰且机组热力系统安全的凝结水泵变频控制策略,并加以实施和变工况验证。优化运行结果表明:该控制策略在保证机组安全稳定运行的前提下,能有效降低凝结水泵的功耗,凝结水泵耗电率由0.218%下降至0.152%;在低负荷阶段节能效果更为显著,在500 MW工况下,凝结水泵功耗由1 057 kW下降至633 kW,下降了40.1%;在400 MW工况下,凝结水泵功耗由1 035 kW下降至512 kW,下降了50.5%。 相似文献
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凝结水泵的最佳调节方案分析 总被引:7,自引:0,他引:7
为研究变频调速技术在200MW凝汽机组凝结水泵调节中应用的节能效果,分别按照由机组承担的负荷、除氧器运行方式及调节形式形成的6个方案进行计算分析。首先,由管路性能曲线和泵特性曲线取得各工况点的流量、扬程和效率,椐此并利用电动机和变频器的效率等获得凝结水泵消耗的电功率和全年运行时间段的耗电量,最后可有进行方案比较分析的年费用值。在各方案中采用变频调速方式相对于节流调节方式耗电量要小;调峰负荷下的各种方案要比对应基本负荷的情况耗电量和年费用小;调峰负荷时除氧器滑压运行方式下的变频调速方案是最经济方案。结果表明,虽然凝结水泵的变速调节方式初投资较高,但在各运行工况特别是启停和非设计工况节能潜力巨大,可延长设备寿命,有较强的经济效益,推广应用性强。图4表1参6 相似文献
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对于多台凝结水泵运行的机组,除采用变频调节外,充分利用凝结水泵性能,在更宽的负荷范围内实现单泵安全运行,对电厂节能将起到重要作用。根据某1000 MW电厂的实际情况,分析低负荷下单泵运行的经济性和安全性。实践表明,在500~700 MW,采用单泵运行比采用双泵运行具有更高的节能效果。 相似文献
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The authors present an evaluation, analysis and comparison of several specific power electronic (PE)-based and non-PE based air conditioner and heat pump technologies, and their potential impact for energy savings on the Florida Power and Light Company system. Data and a computer flow chart are provided. Four heat pump models are developed and compared in regard to Florida climates. These models are conventional single-speed, two-speed, variable-speed, and Oak Ridge National Lab variable-speed systems. Some of the results indicate that, generally, the major advantage of PE-based variable-speed variable-capacity heat pumps is due to the higher coefficients of performance and energy efficiency ratios resulting from oversized heat exchangers, and the decrease of cycling losses that result from on/off operation which must occur when capacity exceeds load 相似文献
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高压变频技术在凝结水泵调速改造中的应用 总被引:1,自引:0,他引:1
结合嘉兴电厂4号机组凝结水泵变频调速改造项目,从装置选型、动力方案、控制逻辑、经济性等几个方面进行了分析和总结,对其"功率单元旁路"和"工频旁路"提出了改进意见,并给出了设备改造及运行方面的建议.采用高压变频技术对凝结水泵进行调速改造后,降低了母管压力,实现了"软启停",延长了系统寿命,取得了较明显的经济效益,对大容量电机变频改造具有一定的参考价值. 相似文献
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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。 相似文献
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A model for a ground-source heat pump (GSHP) fitted with a variable-speed compressor was developed. A frequency inverter (FI) was used to modulate the GSHP capacity for improving the part-load performance of the system. Year-round dynamic simulations were made using TRNSYS for a general office based on the weather conditions in Hong Kong (HK), Kunming (KM) and Beijing (BJ). Different control schemes for the part-load control were tried and the results compared. It was found that the adoption of a variable-speed part-load control to the GSHP in both the cooling and heating mode operations was better. A reduction in the compressor energy input by minimum 27% could be achieved although a slight increase in the borefield fluid circulating pump energy consumption was inevitable. The peak borefield fluid temperatures were also reduced which allowed the borehole lengths to be shortened by at least 4% and the initial cost lowered accordingly. An economic analysis indicated that with the reduced borehole lengths, the payback periods were no longer than 0.4 months. This highlighted the merit of employing a variable-speed part-load in a GSHP system as the initial cost might also be saved besides the running costs under a wide range of climatic conditions. 相似文献
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介绍在660MW机组凝结水泵变频改造中所修改的主要控制逻辑,包括除氧器水位调节,凝结水泵的启、停操作和联锁保护等,并通过相关试验和实际运行证实了改造后取得了较好的应用效果,对同类机组有一定的借鉴参考价值。 相似文献