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本文针对整体式预热器U型管蒸汽发生器建立了热工数学模型并进行了动态模拟。该模型是一个25阶、非线性、可移动边界模型。包括:一、二次侧的质量与能量平衡方程以及确定二次侧下降段流量的动量守恒方程。对所建立的模型利用Gear方法作了蒸汽阀门开度阶跃10%的瞬态模拟,所得结果和国外所公布的结果吻合得很好。由此可见。本文所建立的模型可以为这种蒸汽发生器的设计、运行、控制提供理论依据。 相似文献
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尹朝亮 《石油化工设备技术》2004,25(6):59-60
针对重油催化裂化余热锅炉省煤器经常"爆管"而难以运行的问题,分析原因后提出三种改进方 案,并优选一种方案实施,成功地解决了该问题,同时大幅度提高了锅炉过热蒸汽产量,节能效果显著。 相似文献
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This article describes the results of an investigation concerning the failure of economizer tubes of a high-pressure boiler
in a dual-purpose power/water cogeneration plant. The failure was observed in the form of rupturing of one tube and a macrohole
or pinhole in another tube. The boiler had an operating period of 116,123 h since its inception. For approximately the first
100,000 h, the fuel for the boiler was crude oil, which was replaced by Bunker C oil. The boiler tube is fabricated from carbon
steel SA 210A1. The location of the failure was determined by on-site visual inspection of the boiler. Detailed macro- and
microexaminations of inner and outer scales on the tube were begun to determine the cause of the rupture. The composition
of the fire- and waterside scale and ash deposited on the outer surface of the tubes was analyzed by energy-dispersive x-ray
(EDX) technique. The reduction percentage of wall thickness of the tube facing inside and outside the furnace was calculated.
The cause of the failure of the economizer tube appears to be H2SO4 dew-point corrosion. The relatively low temperature of feedwater lowered the tube metal temperature and promoted the condensation
of H2SO4. The external deposits on the tubes, as a result of bunker oil firing, further helped to lower the tube metal temperature,
thus promoting H2SO4 condensation over the deposit and subsequent corrosion of the tube wall. Recommendations are given to prevent/minimize such
failures. 相似文献
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针对某电厂锅炉排烟温度较高,通过分析和热力计算,采用传热交流较高的螺旋肋片管省煤器改造方案,使改造后锅炉排烟温度下降约32℃,锅炉热效率提高1.6%.图2表2 相似文献
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A significant portion of energy consumed in buildings is attributed to energy usage by heating, ventilating and air conditioning (HVAC) systems. Free cooling is a good opportunity for energy savings in air conditioning systems. With free cooling, commonly is known economizer cycle, the benefits of lower ambient temperatures are utilized for a significant proportion of the year in many climates. The detailed analysis of local weather data is required to assess the benefits of economizer. In this study, free cooling potential of ?stanbul, Turkey was determined by using hourly dry-bulb temperatures measurements during a period of 16 years. It is found that the free cooling potential varies with supply air temperature and months. It is determined that although there are substantial energy savings during a significant portion of the year especially in transition months (April, May, September and October), the high outdoor air temperatures from June to August, made the system not beneficial for free cooling except at high supply air temperature. 相似文献
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螺旋翅片管结构对锅炉省煤器性能影响的研究 总被引:1,自引:0,他引:1
介绍了螺旋翅片管在电站锅炉省煤器的改造和设计中的应用情况.研究了螺旋翅片管省煤器的传热、阻力特性、结灰和磨损等方面的机理.分析了螺旋翅片管的直径、翅高、翅间距、翅厚、管间距等参数和管束布置方式对省煤器的传热、阻力特性、结灰和磨损等方面的影响. 相似文献
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锅炉省煤器的飞灰磨损状态及材料耐磨性能浅析 总被引:1,自引:0,他引:1
通过冲蚀磨损模型和对省煤器工作环境的分析 ,解释了燃煤锅炉省煤器管子的磨损状态及主要的影响因素。从材料学角度分析了提高管子抗磨性能的方向 相似文献