共查询到19条相似文献,搜索用时 250 毫秒
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对煤气锅炉空气预热器的漏风问题进行研究,从理论上分析了漏风的原因和危害,提出了漏风的预防和治理措施.重点分析了空气预热器冷端漏风和热端漏风对排烟温度和排烟热损失的影响,结果表明,冷端漏风对排烟温度的影响较大,但不会对排烟热损失造成影响;热端漏风对排烟温度的影响比冷端小,但对排烟热损失的影响较大. 相似文献
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将省煤器安装在锅炉尾部,可解决排烟温度过高的问题。热管技术在余热回收项目的应用是目前比较成熟的方案,通过现场勘察和计算,使用热管式省煤器,能够解决排烟温度过高的问题,同时也可保证锅炉安全运行。 相似文献
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将省煤器安装在锅炉尾部,可解决排烟温度过高的问题。热管技术在余热回收项目的应用是目前比较成熟的方案,通过现场勘察和计算,使用热管式省煤器,能够解决排烟温度过高的问题,同时也可保证锅炉安全运行。 相似文献
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排烟温度是衡量热源厂热经济性的一个指标。为了解决某地58 MW循环流化床热水锅炉排烟温度偏高的问题,通过现场测试和调整,提出切实可行的措施。烟气速度偏低将导致积灰严重,影响传热,这是排烟温度高的主要原因。在分离器性能比较好的条件下,设计时应适当提高尾部受热面的烟气流速,采用吹灰器或者省煤器采用错列布置方式以增强自清灰能力,控制尾部受热面的积灰。 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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Performance and emission characteristics of vegetable oils at elevated temperatures are studied. Fuels are run in two four-cycle, direct injection compression ignited engines having different number of cylinders, compression ratios, rated power and cooling systems but relatively close engine speed. Brake thermal efficiency, exhaust gas temperature, and CO, O2, Unburned HC and NO emissions are determined as a function of load at ambient and preheat conditions for peanut, sunflower and canola oils. Overall, effects of preheat, engine type and type of vegetable oils on engine performance and exhaust gas emissions are discussed. 相似文献
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Xiaolu Li Xinqi Qiao Liang Zhang Junhua Fang Zhen Huang Huimin Xia 《Renewable Energy》2005,30(13):2075-2084
Though, as a renewable energy resource, alcohol fuel has many advantages in China, it is difficult for diesel engines to operate on alcohol due to its low cetane number and high latent heat of vaporization. This paper proposes an approach to its ignition problem by combining internal exhaust gas recirculation (EGR) with injection of small diesel fuel. Based on this approach, a two-stroke single-cylinder diesel engine was developed. Preliminary studies demonstrated that the engine can run on alcohol with almost zero level of smoke and low exhaust gas temperature, and that the engine operating on alcohol has lower nitrogen oxide (NOx) emissions and 2–3% higher effective thermal efficiency than that operating on diesel fuel in moderate and high load zones. 相似文献
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对三菱M701F4型燃气轮机的排气检测包括温度检测、压力检测与可燃气体含量检测进行了介绍。其中着重介绍了燃气轮机的排气温度检测,它是通过26个热电偶来实现的。其中20个热电偶用于检测透平叶片通道温度(BPT),6个热电偶用于检测透平排气系统下游排气烟道的排气温度。结合某公司机组自投运以来出现的几次BPT负偏差偏大等的异常情况,详细叙述了该类故障的分析判断过程和解决方法,并从系统工艺流程和设备选型改进上,给出了预防此类故障的建议和措施。 相似文献
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Pertti Kauranen Tuomo Elonen Lisa Wikström Jorma Heikkinen Juhani Laurikko 《Applied Thermal Engineering》2010,30(6-7):631-638
Modern automotive diesel engines are so energy efficient that they are heating up slowly and tend to run rather cold at subzero temperatures. The problem is especially severe in mail delivery operations where the average speed is low and the drive cycle includes plenty of idling. The problem is typically solved by adding a diesel fuelled additional engine heater which is used for the preheating of the engine during cold start and additional heating of the engine if the coolant temperature falls below a thermostat set point during the drive cycle. However, this additional heater may drastically increase the total fuel consumption and exhaust gas emissions of the vehicle. In this study the additional heater was replaced by a combination of exhaust gas heat recovery system and latent heat accumulator for thermal energy storage. The system was evaluated on a laboratory dynamometer using a simulated drive cycle and in field testing in the city of Oulu (65°N), Finland in February 2009. 相似文献
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介绍天然气冷凝式余热回收原理,分析天然气燃烧产物的组成,对排烟热损失、节能量、冷凝率进行了计算和分析。结果显示,烟气中可回收的蒸气潜热达到烟气低位热值的11.2%。排烟热损失随排烟温度的升高而增加,当排烟温度低于露点温度时,排烟热损失随排烟温度的升高急剧增加,水蒸气冷凝率随排烟温度的升高而降低。此外,对这种方法降低烟气中NOX排放的环保特性也进行了探讨。 相似文献
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在燃机运行过程中对排温度分散度的监视非常重要。本文分析了造成排烟温度分散度大的一般原因,阐述了排烟温度分散度大对燃机热部件的危害,同时还对控制系统中排烟温度分散度允许值的计算方法进行了简单的说明,最后对在运行过程中如何对排烟温度分散度进行监视进行了说明。 相似文献
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为了提高CNG发动机排气温度预测精度,基于BP、RBF和GRNN神经网络建立了3种排气温度的预测模型。开展了CNG发动机台架实验,测量了不同工况条件下发动机的排气温度,利用实验值对模型进行训练,并预测了不同发动机转速、空气进气量、点火提前角等条件下的排气温度,将预测值与实验值进行了对比分析,评估了不同预测模型的准确性。结果表明:BP、RBF和GRNN 3种神经网络的误差分别为3.5%、2.8%和3.1%。RBF神经网络的预测误差比BP和GRNN神经网络的误差小,稳定性强,更适合CNG发动机的排气温度预测。 相似文献