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本文针对河源电厂600MW超超临界锅炉水冷壁超温情况,分析了水冷壁超温及爆管的原因,提出了相应的防止水冷壁超温的调整方法及建议.为了防止同类机组投产时产生相同的问题,给出了机组在投产前应加强化学清洗、实行给水加氧处理以及加强燃烧调整的建议. 相似文献
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火力发电厂设备运行中,对锅炉的各大系统要进行分析研究,分析影响汽温变化和蒸汽变化的因素,掌握锅炉蒸汽系统及汽温调节的设计与控制措施,在此基础上进行优化分析,,确保电厂锅炉能够发挥最大的性能. 相似文献
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某300MW电厂四角切圆燃烧方式进行烟气脱硝改造后,在控制氮氧化物生成、燃烧稳定与安全性以及汽温偏低等方面以实验数据为依托进行了分析。结果表明：分级低氮燃烧方式与燃烧的稳定性是相对的;上层SOFA风的开度对氮氧化物排放的控制及对消除热偏差有显著效果;中低负荷下,低氮燃烧造成炉渣含碳量增加;中低负荷低氮燃烧前屏易超温,主再热汽温偏低,热偏差大。 相似文献
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根据宁夏大唐国际大坝发电公司2* 600MW投产五年以来的实际运行情况,针对直接空冷机组凝汽器在冬季运行过程中出现的冻结问题,在大量统计资料及试验的基础上,分析出空冷凝汽器在冬季运行过程中冻结的原因,提出直接空冷机组在冬季运行中应该采取的措施,保证了直接空冷机组冬季的安全稳定运行. 相似文献
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中青年在长跑和超长跑后的即刻体温(肛温)均约升高2-3℃。本文对68名老龄受试者跑完3万米后所测的即刻体温(口腔温)发现,恰好和中青年相反,有91%以上的人都下降。这反映出老年人随着增龄,其生化过程递缓,产能储备力也同步衰减的特征。 相似文献
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本文简要概述了K-1000-60/3000型汽轮机高压缸结构,介绍了核电站汽轮机高压缸端部密封面漏汽情况及潜在风险,重点针对高压缸端部密封面漏汽问题进行了详细的原因分析。根据漏汽原因和设备结构特征采取了在汽缸端部密封面上增加密封条的技术改造处理措施,主要是通过在汽缸中分面上垂直于漏汽方向的位置处开槽,在槽内安装密封条的技术改造手段阻止蒸汽外漏。文中还对技术改造处理工艺过程进行了详细的介绍与总结。通过本技术措施消除了机组的安全隐患,提高了设备的可靠性,确保了机组的安全、稳定、高效运行,同时积累了丰富的工程经验,为同类型汽轮机组处理类似技术难题起到了很好的借鉴作用。 相似文献
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随着环境保护意识的不断增强,核电这种清洁能源已经进入了快速发展阶段,同时,电站造成的海洋热污染也进入了公众的视“。本文对国内核电站温排水的现状进行整理和分析,通过对目前电站普遍采用温排水的三种排放方式、生态环境影响、温排水综合利用及法规政策的介绍和分析,为进一步深入的研究提供素材和依据。 相似文献
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随着我国经济水平的不断提升和混凝土施工发展速度的持续加快。温拌沥青混凝土路面施工技术在我国路面施工过程中得到了越来越广泛的应用。从阐述温拌沥青混凝土路面施工技术实践入手,对温拌沥青混凝土路面施工技术能耗问题进行了分析。 相似文献
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对人体在高温环境下运动所导致的生理变化及运动能力下降的原因进行分析,探讨高温环境下人体运动体温调节与运动疲劳之间的关系,并找出规律,制定应对措施,以期为改善运动员的身体机能及提高运动能力提供参考。 相似文献
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Fredric L. Goss William G. Herbert Thomas B. Kelso 《Research quarterly for exercise and sport》2013,84(3):292-294
Abstract Little research has investigated the observational learning process from a developmental perspective. The purpose of this study was to extend previous research by considering two factors: performance versus learning and sequencing versus form scores. Children 'N = 60) comprising two age groups (5-0 to 6-11 and 8-0 to 9-11 years) were randomly assigned to verbal rehearsal only, model only, or model plus verbal rehearsal conditions. The task was a 6 part motor skill sequence in which proper sequencing and quality of form were assessed. A 2 × 3 × 4 (age group by model type by trial blocks) repeated measures MANOVA revealed a significant three-way interaction. Older children performed equally well under any of the model type conditions during both performance and learning. For younger children, a model plus rehearsal was superior to rehearsal only on sequence and form at performance and learning and superior to model only on sequence scores during the first two performance trial blocks. Model only and model plus rehearsal conditions were equally effective on form scores. These results suggest that age differences exist in the modeling of motor skills under conditions varying in model type, sequence and form scores, and performance and learning phases. 相似文献
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对我国中南地区冬泳锻炼的研究 总被引：4，自引：0，他引：4
黄海涛 《武汉体育学院学报》2003,37(3):163-164
通过对中南地区气候和水温变化的测定，认为该地区的气候适于广泛开展冬泳运动，促进全民健身的普及与提高。冬泳活动时间应参照气温加水温除以2的形式得出，不同地区冬泳时间有不同形式的计算方式。 相似文献
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Jessica M. Stephens Shona L. Halson Joanna Miller Gary J. Slater Christopher D. Askew 《Journal of sports sciences》2018,36(9):1044-1053
This study examined the influence of body composition on temperature and blood flow responses to post-exercise cold water immersion (CWI), hot water immersion (HWI) and control (CON). Twenty-seven male participants were stratified into three groups: 1) low mass and low fat (LM-LF); 2) high mass and low fat (HM-LF); or 3) high mass and high fat (HM-HF). Experimental trials involved a standardised bout of cycling, maintained until core temperature reached 38.5°C. Participants subsequently completed one of three 15-min recovery interventions (CWI, HWI, or CON). Core, skin and muscle temperatures, and limb blood flow were recorded at baseline, post-exercise, and every 30 min following recovery for 240 min. During CON and HWI there were no differences in core or muscle temperature between body composition groups. The rate of fall in core temperature following CWI was greater in the LM-LF (0.03 ± 0.01°C/min) group compared to the HM-HF (0.01 ± 0.001°C/min) group (P = 0.002). Muscle temperature decreased to a greater extent during CWI in the LM-LF and HM-LF groups (8.6 ± 3.0°C) compared with HM-HF (5.1 ± 2.0°C, P < 0.05). Blood flow responses did not differ between groups. Differences in body composition alter the thermal response to post-exercise CWI, which may explain some of the variance in the responses to CWI recovery. 相似文献
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《European Journal of Sport Science》2013,13(2):119-126
Abstract Ensuring athletes achieve an appropriate quality and/or quantity of sleep may have significant implications for performance and recovery and reduce the risk of developing overreaching or overtraining. Indeed, sleep is often anecdotally suggested to be the single best recovery strategy available to elite athletes. A number of nutritional factors have been suggested to improve sleep, including valerian, melatonin, tryptophan, a high glycaemic index diet before bedtime, and maintenance of a balanced and healthy diet. Conversely, consumption of alcohol and caffeine and hyper-hydration may disturb sleep. Strategies such as warming the skin, hydrotherapy, and adoption of appropriate sleep hygiene (maintenance of good sleep habits and routines) are other tools to aid in sleep promotion. Ensuring athletes gain an appropriate quality and quantity of sleep may be important for optimal athletic performance. 相似文献
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The changes in postural tremor of the hand and the subsequent effect on shooting performance produced by moderate cooling and heating of the forearm were studied in six subjects. Cooling produced a large decrease in tremor size of the ipsilateral hand, whereas warming the limb produced an increase in tremor size. Cooling or warming the forearm did not change the peak frequency of tremor significantly, which was quite stable for each subject. The improvement in shooting performance after cooling the forearm, as measured by grouping pattern of the shots, reached statistical significance and warming caused a significant worsening. This measure of performance was shown to correlate (r = 0.776) inversely with tremor size. The causes and implications of these changes are discussed. It is suggested that local cooling may be useful for people who wish temporarily to reduce tremor in order to improve dexterity for shooting and for other purposes. 相似文献
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目的：研究五味子多糖（Schisandra chinensls Polysaccharide, SCP）的基本理化性质及其对高温下小鼠游泳能力与糖代谢的影响。方法：采用水提醇沉法提取了SCP,对其基本成分含量、紫外和红外光谱进行了检测;同时建立了一个5周的小鼠高温游泳模型,灌胃不同剂量的SCP水溶液,测定了小鼠的游泳力竭时间,然后分别在小鼠力竭运动即刻、运动后24h恢复2种情况下取材,测定了血糖、血乳酸的浓度以及肝、肌糖原含量。结果：SCP是一种蛋白多糖,对小鼠高温下游泳力竭时间有明显的延长作用,显著提高小鼠肝糖原和肌糖元储备。结论 SCP具有抗运动性疲劳的作用,其机理与其调节机体糖代谢有关。 相似文献