共查询到17条相似文献,搜索用时 156 毫秒
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分析了循环流化床锅炉所排飞灰含碳量高的原因,提出采用富氧燃烧技术;介绍了高压纯氧降压、调配混合及局部增氧富氧燃烧技术的特点及控制方式;实际应用表明,采用富氧燃烧技术,可提高锅炉燃烧效率,具有节能减排效果。 相似文献
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在CFB锅炉上热态测试了二次风率和上下二次风比变化对CFB锅炉机械不完全燃烧损失的影响,结果发现:随着二次风率的增加,飞灰含碳量先下降后缓慢上升,炉渣含碳量小幅增加,灰渣比逐步减少且减幅收窄;随着上下二次风比的增加,飞灰含碳量先降低后缓慢升高,炉渣含碳量略有上升,灰渣比减少;过量空气系数较大时,对应的飞灰含碳量和炉渣含碳量较低,灰渣比较小。试验表明,对于燃用福建无烟煤的CFB锅炉,存在最佳的过量空气系数、二次风率和最佳上下二次风比,可使机械不完全燃烧损失最小。 相似文献
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循环流化床锅炉下排气旋风分离器处于正常运行状态时,可以将烟气中带有一定含碳量的飞灰进行回收再燃烧,使锅炉热效率提高5%-8%,并有效降低粉尘排放,提高环保效益。 相似文献
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煤粉炉和循环流化床锅炉飞灰特性对其汞吸附能力的影响 总被引:2,自引:0,他引:2
通过分析两台容量相近的循环流化床锅炉和煤粉锅炉飞灰样品的粒径分布、表面结构特性、未燃尽碳含量、反应性和汞含量,探究两种类型锅炉飞灰特性差异及其与飞灰汞吸附能力的关系。结果表明:循环流化床和煤粉锅炉尾端除尘设备排灰口飞灰汞的含量分别为1584.0 ng/g和503.7 ng/g,其原因与飞灰粒径、未燃尽碳含量和表面特性相关。对于循环流化床锅炉,飞灰中汞含量随其粒径和反应性温度的减小而增加,随未燃尽碳含量增加而增加,且与比表面积和吸附量呈正相关关系。对于煤粉锅炉,粒径为75~53 μm的飞灰对汞吸附能力较强,未燃尽碳含量明显小于循环流化床所产生飞灰的含量,飞灰比表面积随粒径变化不大,由此导致煤粉锅炉除尘设备排灰口所取样品对汞的吸附能力远低于循环流化床锅炉相对应位置飞灰对汞的吸附能力。 相似文献
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Characterization of the coal fly ash for the purpose of improvement of industrial on-line measurement of unburned carbon content 总被引:1,自引:0,他引:1
The influence of selected properties of fly ash on the measurements of an on-line analyser was described. Fly ash studied in the research originated from the pulverized coal fired boiler. The samples were taken using an inspection method within a period of 3 months. Systematic observation of the properties of the ash allowed monitoring of the work of the industrial analyzer during a relatively long period of the power plant work. Samples of coal fly ash were examined for their chemical and physical properties. Morphology was analysed by scanning electron microscopy. Unburned carbon content in fly ash was determined by using loss-on-ignition (LOI) and thermogravimetry analysis (TGA). The particle size distribution of fly ash was examined. Correlation between laboratory and on-line industrial measurements of the unburned carbon content of ash was discussed. 相似文献
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燃煤锅炉掺烧贫煤气,可以减少燃煤的用量,降低了飞灰中碳量和烟气中氧含量,固体未完全燃烧损失所占的百分数和灰渣热损失下降,锅炉热效率提高,年创效益可达百万元。 相似文献
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Classification of carbon in Canadian fly ashes and their implications in the capture of mercury 总被引:1,自引:0,他引:1
Fly ashes produced from Canadian power plants using pulverized coal and fluidized bed combustors were examined for their carbon content to determine their ability to capture mercury. The feed coal used in these power plants were lignite, subbituminous, high and medium volatile bituminous, their blends, and also blends of coal with petroleum coke (Petcoke). The carbon and mercury content of the coals and fly ashes were determined using the ASTM standard method and by the cold vapour atomic absorption spectrometry method. The carbon content of the fly ash was concentrated by strong acid digestion using HCl and HF. The quantitative and qualitative analyses of the carbon concentrate were made by using a reflected light microscope. The results show that the carbon content of fly ash appears to be partially related to depositional environment during coalification and to the rank of the coal. The Hg captured by the fly ash depends on the rank and blend of the feed coals and the type of carbon in the fly ash. The isotropic vitrinitic char is mostly responsible for the capture of most Hg in fly ash. The inadvertent increase in carbon content due to the blending of coal with petroleum coke did not increase the amount Hg captured by the fly ash. The fly ash collected by the hot side electrostatic precipitator has a low Hg content and no relation between the Hg and carbon content of the ash was observed. These results indicate that the quantity of carbon in the fly ash alone does not determine the amount Hg captured. The types of carbon present (isotropic and anisotropic vitrinitic, isotropic inertinitic and anisotropic Petcoke), the halogen content, the types of fly ash control devices, and the temperatures of the fly ash control devices all play major roles in the capture of Hg. 相似文献