共查询到19条相似文献,搜索用时 50 毫秒
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阐述了凝结换热及冷凝式锅炉原理及其应用背景,分析了制约冷凝式锅炉快速发展的技术和政策瓶颈,介绍了先进的凝结换热和冷凝式锅炉应用技术,为我国未来冷凝式锅炉技术创新指出了参考方向。 相似文献
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阐述了凝结换热及冷凝式锅炉原理及其应用背景,分析了制约冷凝式锅炉快速发展的技术和政策瓶颈,介绍了先进的凝结换热和冷凝式锅炉应用技术,为我国未来冷凝式锅炉技术创新指出了参考方向。 相似文献
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节能的冷凝式供热锅炉 总被引:8,自引:1,他引:8
冷凝式锅炉由于利用烟气水中蒸汽的潜热,可将热效率提高到100%以上(仍按燃料低发热量计)。且排烟中有害物浓度大大降低,可减轻对大气的污染,有利于环保。50kW以下的锅炉的凝水可不用各和处理直接排放。因锅炉增设冷凝部分及烟道、烟囱需防腐而啬的费用可在2 ̄4年内回收,这种锅炉燃用液体、气体燃料和应用于低温热水供热系统时节能效益尤为明显,应大力推广使用。 相似文献
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文章对用空气来回收燃气锅炉排烟中水蒸气汽化潜热的冷凝式空气加热器,以加热器内烟气中的水蒸气开始冷凝处的烟气和空气的温差△tx为变量,计算分析了锅炉最终排烟温度、加热的空气量、空气回收的热量、锅炉热效率与加热器面积大小变化的关系,为选择利用空气来回收燃气锅炉汽化潜热提供理论依据。以陕北天然气为例,如果将30℃的空气加热到120℃,计算结果表明,温差出。从25℃减少到0℃时,最终排烟温度略微降低约2℃,相应的加热的空气量增大1.5倍,而加热器的面积急剧增大到无穷大,锅炉效率提高的极限为4.67%,此时潜热占总回收热量的28.6%。 相似文献
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对当前国内冷凝式锅炉技术研发过程中出现的问题提出了一些看法,并对当前燃油气锅炉节能方法进行总结,建议尽快组织制定相关技术规范,以引导我国燃气冷凝锅炉产品健康、科学发展. 相似文献
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文章主要详细阐述了直接冷凝式锅炉的基本原理、设计时的注意点 ,通过试制的样品炉试验结果证明 ,采用液柱式作冷凝换热的直接冷凝式锅炉具有满意的节能与环保效果 相似文献
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通过对锅炉热效率进行反平衡测试,找出锅炉热效率降低的主要原因,有针对地实施改进,提高锅炉热效率,节约大量燃料,达到节能目的。 相似文献
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Condensing boiler applications in the process industry 总被引:3,自引:0,他引:3
Qun Chen Karen FinneyHanning Li Xiaohui ZhangJue Zhou Vida SharifiJim Swithenbank 《Applied Energy》2012,89(1):30-36
Major challenging issues such as climate change, energy prices and fuel security have focussed the attention of process industries on their energy efficiency and opportunities for improvement. The main objective of this research study was to investigate technologies needed to exploit the large amount of low grade heat available from a flue gas condensing system through industrial condensing boilers. The technology and application of industrial condensing boilers in various heating systems were extensively reviewed. As the condensers require site-specific engineering design, a case study was carried out to investigate the feasibility (technically and economically) of applying condensing boilers in a large scale district heating system (40 MW). The study showed that by recovering the latent heat of water vapour in the flue gas through condensing boilers, the whole heating system could achieve significantly higher efficiency levels than conventional boilers. In addition to waste heat recovery, condensing boilers can also be optimised for emission abatement, especially for particle removal. Two technical barriers for the condensing boiler application are corrosion and return water temperatures. Highly corrosion-resistant material is required for condensing boiler manufacture. The thermal design of a “case study” single pass shell-and-tube condensing heat exchanger/condenser showed that a considerable amount of thermal resistance was on the shell-side. Based on the case study calculations, approximately 4900 m2 of total heat transfer area was required, if stainless steel was used as a construction material. If the heat transfer area was made of carbon steel, then polypropylene could be used as the corrosion-resistant coating material outside the tubes. The addition of polypropylene coating increased the tube wall thermal resistance, hence the required heat transfer area was approximately 5800 m2. Net Present Value (NPV) calculations showed that the choice of a carbon steel condenser ensured cash return in a relatively shorter period of time (i.e. 2 years) when compared to a stainless steel condenser (i.e. 5-7 years). Moreover, the NPV for the stainless steel was more sensitive to the change of the interest rate. 相似文献
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介绍了一种采用电磁加热技术的采暖壁挂炉,叙述并分析了其设计方案,并进行了电磁加热装置设计计算,为矿山建筑物冬季采暖提供一种新的解决方案。 相似文献
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在分离式冷凝锅炉的换热装置系统中处理烟气中,处理冷凝水的方法通常是通过净化处理再利用。本文的分离式冷凝锅炉冷凝水处理方案是将冷凝水经系统处理作为锅炉的给水,将冷凝换热装置节约的能量直接反馈回锅炉,由于锅炉负荷的波动带来烟气温度与给水流量的变化,导致冷凝率不稳定,所以本文中采用理论方法计算冷凝水量。 相似文献
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