共查询到20条相似文献,搜索用时 156 毫秒
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锅炉热管空气预热器的设计及优化武淑平宋学广南京电力高等专科学校南京动力高等专科学校热管作为一种高效换热元件,由于其独特的性能,近些年来已成为电厂锅炉解决空气预热器低温腐蚀、堵灰的有力工具,是降低排烟温度,提高锅炉热效率值得考虑采用的措施之一。本文就锅... 相似文献
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排烟温度偏高会造成锅炉效率下降,影响锅炉的经济运行.对锅炉排烟温度高的原因进行分析,影响排烟温度高的主要因素是受热面积灰和空气预热器堵灰,通过运行优化和清洗空气预热器的堵灰,降低了锅炉排烟温度,对电厂提供了指导. 相似文献
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空气预热器能降低排烟温度、升高热风温度,提高锅炉效率。甘蔗渣锅炉空气预热器堵塞是常见现象,对锅炉经济运行有着严重影响。文章结合广西糖业集团西江制糖有限公司两台锅炉在2017年和2018年进行的两次技术改造工作,分析了管式空气预热器堵塞的原因以及对锅炉燃烧效率和经济性的影响,并根据具体原因确定解决方案。 相似文献
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介绍锅炉B1601尾部受热面的改造,将回转式空气预热器改进为热管式空气预热器,并增设省煤器,以减少排烟热损失,提高锅炉热效率。 相似文献
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成敏 《能源技术(上海)》1999,(3):12-13
低硫分的燃油,其烟气中的酸露点氏,因而可以适当降低锅炉的排烟温度,提高锅炉的热效率。热管空气预热器因其优异的抗低温腐蚀性能在我厂锅炉尾部烟道中应用取得成功,已无故障运行十二年。 相似文献
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在锅炉尾部空间增设烟气一空气换热器(即前置式空气预热器),可有效降低锅炉排烟温度,提高锅炉效率。但前置式空气预热器可利用形式多样,且可行性和经济性受其流动阻力、维护方便性、金属耗量、抗腐蚀性、占烟道空间等众多因素影响。针对可用作前置式空气预热器的几种形式:回转式预热器、水媒式预热器、热管式预热器、管壳式预热器,结合某典型1000 MW超超临界燃煤发电机组锅炉实际参数,对各影响因素进行计算。然后对各指标计算结果建立完整的分析模型,利用层次分析法和灰色关联系数法,完成对不同换热器形式的灰色综合评价和优选分析。结果表明:采用灰色关联层次分析方法可以有效解决大型燃煤电站锅炉前置式空气预热器选型问题,对于案例电厂,水媒式换热器更适合做前置式空气预热器。 相似文献
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通过对 2 12 - 75 3.82型煤粉锅炉使用热管式预热器的应用效果分析 ,说明了以防止低温腐蚀和降低排烟温度为目的的锅炉改造 ,要结合锅炉大修对锅炉热管预热器及其尾部受热面进行综合改造 ,才能使热管预热器在应用中获得明显的效果 相似文献
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为了解决660 MW机组锅炉配置单列大型空气预热器时存在的两侧排烟温度偏差大、冷端易堵塞、热一次风温度偏低问题,开展变换空气预热器旋转方向和提高转速的研究。结果显示:空气预热器旋转方向对热一次风温度具有明显影响;调整旋转方向且换热元件先预热一次风时,高负荷下的热一次风温度提高量超过50℃,提升了制粉系统干燥出力;空气预热器旋转速率对排烟温度及两侧偏差具有明显影响,将旋转速率自0.6 r/min提高至1.0 r/min,高负荷下两侧排烟温度偏差降低量超过15℃,整体排烟温度降低量超过8℃。通过改变转向和提高转速,空气预热器的运行特性得到大幅度优化。 相似文献
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王丽云 《中国锅炉压力容器安全》2009,(2):54-56
高压加热器属压力容器,是利用汽轮机不同段位抽出的蒸汽对给水进行加热,最终达到锅炉所要求的给水温度和品质,使蒸汽热量得到了充分的利用,提高了整个循环的热效率。高压给水加热器(简称高加)由于工作在高温高压的环境下,所以比较容易发生管束泄漏故障。高压加热器运行中常见的加热器管系泄漏,换热管、管子与管板的泄漏是存在的普遍问题。本文对产生高加泄漏的原因进行了分析,并根据实际运行情况提出了预防和解决的措施。 相似文献
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This paper is based on the proposal of a new waste heat recovery (WHR) system, which can be utilized to heat the boiler return water, boiler supply air, and building heating air. The system is the combination of an indirect contact condensing unit (IDCCU), a mechanical compression heat pump, and two air preheaters. The system is modeled on the basis of mass and energy balance and then thermodynamically analyzed. Improved performance results were obtained in the form of an increase in the boiler's energy efficiency of about 10.47%, with 4.87% increase in exergy efficiency. The coefficient of performance (COP) of the heat pump was increased from 1.23 to 1.45 by the addition of an air heater in the conventional heat pump. The exergy destruction in each component is calculated. Sensitivity analysis was performed to check the influence of different operating parameters on the performance of the WHR system and boiler. It can be observed from the results that for a specific refrigerant temperature and a calculated amount of mass, flow rate can maximize the condensation efficiency of IDCCU by decreasing the flue gas temperature, while the use of the air heater can further reduce the flue gas temperature, and a stream of hot air can be utilized for space heating. A comparison is made with the other system on a performance basis. The results shows a clear difference in efficiencies and profit earned. 相似文献
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有机热载体炉烟气余热回收技术浅析 总被引:2,自引:0,他引:2
长期以来,有机热载体炉排烟温度偏高,造成大量的能源浪费,严重影响了锅炉运行的经济性。为减少热能损失,对烟气余热回收技术的可行性方案、工程应用实例进行了阐述;并指出通过锅炉烟气余热利用技术回收排烟中的显热和潜热,可以大大提高有机热载体炉的热效率,实现节能降耗。 相似文献
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The objective of this paper is to provide the optimal choice of single-reheating or double-reheating when considering residual flue gas heat in S-CO_2 coal fired power system. The cascade utilization of flue gas energy includes three temperature levels, with high and low temperature ranges of flue gas heat extracted by S-CO_2 cycle and air preheater, respectively. Two methods are proposed to absorb residual flue gas heat Qre in middle temperature range. Both methods shall decrease CO_2 temperature entering the boiler T4 and increase secondary air temperature Tsec air, whose maximum value is deduced based on energy conservation in air preheater. The system is analyzed incorporating thermodynamics, boiler pressure drop and energy distribution. It is shown that at a given main vapor temperature T5, the main vapor pressure P5 can be adjusted to a value so that Qre is completely eliminated, which is called the main vapor pressure adjustment method. For this method, single-reheating is only available for higher main vapor temperatures. The power generation efficiency for single-reheating is obviously higher than double-reheating. If residual flue gas heat does exist, a flue gas heater FGC is integrated with S-CO_2 cycle, which is called the FGC method. Both single-reheating and double-reheating share similar power generation efficiency, but single-reheating creates less residual flue gas heat. We conclude that single-reheating is preferable, and the pressure adjustment method achieves obviously higher power generation efficiency than the FGC method. 相似文献
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本文通过对锅炉空预器低温腐蚀原因的分析,提出了技术改造方案,并根据换热特点和改造现场的条件限制,确定采用椭圆翅片管制成的暖风器,安装后运行效果良好,为椭圆翅片管换热技术的应用提供了经验。 相似文献
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对燃煤锅炉原有盘管式暖风器结构特点及存在问题进行了分析,提出了新型套管式暖风器的设计思路,探讨了新型套管式暖风器设计制造过程中的几个具体问题。新型暖风器投用后可以有效地防止管内介质的泄漏,大大提高暖风器运行的可靠性,减少燃煤锅炉尾部受热面的低温腐蚀,减缓了锅炉空气预热器的堵灰速率,具有较高的推广价值。 相似文献