共查询到20条相似文献，搜索用时 46 毫秒
1.
本文通过对蒸汽锅炉余热深度利用节能效果的热力学分析,来选定锅炉的运行工况,同时分析了不同烟气余热利用集成方式的节能效果。为不同情况下集成方式的选取和分析提供了依据和基础。 相似文献
2.
目前国内的电力需求仍然靠燃煤发电。燃煤电厂的经济高效运行是我国实现能源节约和节能减排的重要途径。燃煤电厂的锅炉运行调整,是通过改变燃烧量等参数,减少燃烧过程的热损失,以提高能源利用率。首先探讨了锅炉运行调整的意义和一般内容,然后分析了影响锅炉运行效率的主要因素。然后提出了锅炉运行调整和优化的一般方法和策略：通过运行调整减少锅炉内的燃烧损失、减少减温水量以及排污量等均是提高锅炉运行性能的可行方案。本文的研究和分析结果可以为实际运行中锅炉的运行调整提供一定的参考,为锅炉运行的优化提供一些可行的方案。 相似文献
3.
4.
由于煤种的多样性,循环流化床锅炉很难长期稳定的使用设计煤种,因此,给循环流化床锅炉的稳定、高效运行带来了诸多难题.本文分析了煤炭的燃烧过程、循环流化床锅炉的燃烧特点及其对煤质的要求,探讨不同煤种对锅炉燃烧的影响,对锅炉的稳定运行和提升电厂的经济效益都有重要的指导意义. 相似文献
5.
目前,国内仍有大量的300MW机组在线上运行,若不能正常的保证300MW机组锅炉的安全的运行,极有可能造成设备的重大的损害以及不可估量的人身伤害,直接的影响电力的供应.详细分析锅炉检修过程的具体过程可以加深对锅炉检修的认识程度,提高对锅炉检修的熟悉程度,在一定程度上保证机组的安全顺畅运行.基于以上原因,本文从锅炉检修的目的、步骤、具体内容以及检修策略等方面,分析了检修过程中所涉及的主要内容和应注意的一些主要问题,本文可以为锅炉的检修工作提供一个可行的参考. 相似文献
6.
发展国民经济重要物质基础之一就是能源,其关系到社会未来的经济发展,我国为了能够更好的建设社会主义社会节约能源是一项重要策略。对锅炉烟气余热综合利用,有利于提升利用能源的效率,只有这样热电厂企业才能具有较强的竞争力。 相似文献
7.
本文从改进锅炉燃烧送气设备的角度,探讨提高锅炉燃烧率的途径,为锅炉燃油部分改进提出建议,使锅炉的运行更优化、更高效。 相似文献
8.
本文简述电厂600MW锅炉机组运行中,排烟温度明显高于设计值.排烟温度升高,排烟损失增大,从而导致锅炉效率降低,煤耗升高,经济效益必然下降,过高排烟温度,对锅炉后电除尘及脱硫设备的安全运行也构成一定威胁.为了解决锅炉排烟温度过高问题,分析造成锅炉排烟温度升高的各种因素.同时结合现场数据分析,提出切实可行的措施以达到降低排烟温度的技术措施. 相似文献
9.
电厂锅炉的经济运行状态较为复杂,需要控制的参数较多,因而在锅炉设备运行阶段,应聘用具有相关从业资格的人员进行合理操作,使之维持在相对经济的运行状态,同时也需对相关设备进行定期维护和检查,消除影响锅炉燃烧效率的因素造成的不利影响,以达到安全、经济和高效运行的目的. 相似文献
10.
元宝山发电有限责任公司#3锅炉机组投产后,锅炉实际运行排烟温度远远高于设计值,排烟温度升高,排烟损失增大,导致锅炉效率降低,煤耗升高,经济效益下降.本文通过对引起排烟温度升高原因进行分析,提出了相应的措施和建议. 相似文献
11.
This study examined the effect of carbohydrate ingestion on metabolic and performance-related responses during and after a simulated 1h cycling time trial. Eight trained male cyclists (VO 2 peak = 66.5ml kg -1 min -1 ) rode their own bicycles mounted on a windload simulator to imitate real riding conditions. At a self-selected maximal pace, the cyclists performed two 1h rides (separated by 7 days) and were fed either an 8% carbohydrate or placebo solution. The beverages were administered 25 min before (4.5ml kg -1 ) and at the end (4.5ml kg -1 ) of the ride. With carbohydrate feeding, plasma glucose tended (P = 0.21) to rise before the time trial. Compared with rest, the plasma glucose concentration decreased significantly (P < 0.05) at the end of both rides, with no statistically significant difference being observed between treatments. Thereafter, plasma glucose increased significantly (P < 0.05) at 15 and 30 min into recovery, and was significantly higher at 30 min during the carbohydrate trial compared with the placebo trial. No significant changes in plasma free fatty acids were observed during the ride. However, a significant increase (P < 0.05) in free fatty acids was found at 15 and 30 min into recovery, with no difference between trials. Mean power output was significantly (P < 0.05) greater during the carbohydrate compared with the placebo trial (mean - S.E.: 277-3 and 269-3W, respectively). The greater distance covered in the carbohydrate compared with the placebo trial (41.5-1.06 and 41.0–1.06km, respectively; P < 0.05) was equivalent to a 44s improvement. We conclude that pre-exercise carbohydrate ingestion significantly increases endurance performance in trained cyclists during a 1h simulated time trial. Although the mechanism for this enhancement in performance with carbohydrate ingestion cannot be surmised from the present results, it could be related to a higher rate of carbohydrate oxidation, or to favourable effects of carbohydrate ingestion on the central component of fatigue. 相似文献
12.
Roy J. Shephard 《Journal of sports sciences》2013,31(7):603-620
The biology and medicine of rowing are briefly reviewed. Effort in a 2000 -m race is about 70% aerobic. Because the boat (and in some instances a cox) must be propelled, successful competitors are very tall, with a large lean mass and aerobic power. Large hearts may lead to erroneous diagnoses of a cardiomyopathy. Large respiratory minute volumes must be developed by chest muscles that are also involved in rowing. The vital capacity is typically large, and breathing becomes entrained. Expiration cannot be slowed relative to inspiration (as normally occurs at high rates of ventilation) and the limiting flow velocity may be reached, with the potential for airway collapse. Performance is strongly related to the power output at the ‘anaerobic threshold’, and lactate measures provide a guide to an appropriate intensity of endurance training. Peak blood lactate levels are higher in males (commonly 11–19 mmol·l -1 and occasionally as high as 25 mmol·l -1) than in females (9–11 mmol·l -1), probably because males have a greater muscle mass in relation to blood volume. The skeletal muscles are predominantly slow twitch in type, developing an unusual force and power at low contraction velocities. Many rowers have a suboptimal diet, eating excessive amounts of fat. Lightweight rowers also have problems of weight cycling. Aerobic power and muscle endurance often change by 10% over the season, but such fluctuations can be largely avoided by a well-designed winter training programme. Injuries include back and knee problems, tenosynovitis of the wrist and, since the introduction of large blades, fractures of the costae. 相似文献
13.
14.
重新认识体育的社会关联 总被引：3，自引：1，他引：2
体育与政治之间存在一个悖论，体育的发展与经济实力之间没有直线相关，体育与教育部分重叠，体育与宗教最为近缘，体育可借用科学手段，体育的艺术禀性日益明显，体育与养生反映着两种人生观。 相似文献
15.
本文在专家访谈、问卷调查、数理统计和文献资料分析的基础上,探析了上海社区体育竞赛参与者的特点、参与者对社区体育赛事运作管理的看法等问题。在此基础上从引进社区体育赛事的志愿者、整合社区体育赛事的各种资源、开发社区体育竞赛的无形资产、组建非营利性的专业团队、规范社区体育赛事的服务管理等方面提出了进一步满足上海社区居民日益增长的体育竞赛参赛需求的对策与措施。 相似文献
16.
对全面把握游泳训练环节的探讨 总被引：4，自引：0，他引：4
从系统观点出发,结合训练实践,对全面把握游泳训练环节进行探讨。认为应强化非智力因素在运动员多年训练中的作用,在育材全过程中不断选材,从整体上把握动态训练的全过程,把培养高水平运动员的整个过程置于一个严格的科学控制之下。 相似文献
17.
18.
影响和限制耐力性运动项目的成绩的生理因素是复杂的和多方面的,取决于训练的强度和运动成绩.大强度持续性运动可导致呼吸肌疲劳.运动性呼吸疲劳可能在决定运动耐量方面起到关键的作用：一方面通过直接影响运动肌力量的生成（外周疲劳）,另一方面,通过肢体用力自感不安反馈引起工作肌运动单位输出功率下降（中枢疲劳）.对呼吸肌进行训练,可能有助于提高耐力性项目的运动成绩. 相似文献
19.
Alan M. Nevill Roger L. Holder Andrew Bardsley Helen Calvert Stephen Jones 《Journal of sports sciences》2013,31(4):437-443
A regression analysis of competitors' tournament results in relation to their world rankings was proposed to identify the effect of home advantage in international ‘grand-slam’ tennis and ‘major’ golf tournaments. The results provided little evidence of home advantage in either the grand-slam tennis or the golf tournaments held in 1993. The only possible evidence of home advantage was found in the Wimbledon tennis and the US Open golf championships. Even these findings can be explained, at least partially, by (1) the availability of information concerning the low world rankings of the British tennis players competing at Wimbledon, and (2) selective entry, allowing only the world's top-ranked foreign golfers into the US open golf tournament. In both cases, the lower ranking home competitors have a greater opportunity to perform above their anticipated world rankings. Therefore, provided entry into tennis and golf tournaments is truly ‘open’ to both the host nation's representatives and foreign competitors alike, home advantage does not appear to be a major factor influencing the competitors' performance in such competitions. These findings may be explained by the relatively objective nature of the scoring systems used in tennis and golf, unlike the subjective influence of refereeing decisions on the results of team-games such as soccer. 相似文献
20.
结合欧洲足球技战术的发展特点,就鲁能泰山足球队的体能训练、技术训练、防守阵型、进攻方式、定位球、职业态度、球星培养等诸方面所存在的不足进行了分析,提出相应的改进意见。 相似文献