共查询到19条相似文献,搜索用时 562 毫秒
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锅炉飞灰含碳量检测技术的发展和现状 总被引:1,自引:1,他引:0
锅炉飞灰含碳量是反映火力发电厂燃煤锅炉燃烧效率的一项重要指标,精确和实时地监测飞灰含碳量有利于提高锅炉燃烧控制水平,降低发电成本,提高机组运行的经济性,同时也有利于提高煤灰的品位,促进煤灰的商品化。综述了飞灰含碳量检测技术的发展和现状,分析了存在的问题,提出了改进的建议,对飞灰含碳量检测技术的发展具有一定的参考价值。 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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Louis M. Pecora Venkataraman Srikrishnan Robert G. Aldrich Peter J. Ficalora 《Fuel》1977,56(4):414-416
A combination of established experimental techniques, i.e. fluorine combustion and mass spectrometry, is presented as a method for the rapid determination of the carbon content in fly ash. Fluorine combustion of fly ash and subsequent gas analysis is shown to agree well with standard loss on ignition analysis for carbon in various fly ashes. Extension of the technique to other elements which form volatile fluorides is mentioned. 相似文献
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通过分析循环流化床锅炉粉煤灰的特点,得出需水量及烧失量过高是制约飞灰分选的关键。为了改善粉煤灰活性,降低飞灰含碳量,并控制额外投资成本,是实现粉煤灰综合利用的新途径。 相似文献
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Thermal gravimetric analysis (TGA) and evolved gas mass spectroscopy were used to study the kinetics of carbon oxidation from a Class-F fly ash. A multi-process ignition loss schema is presented wherein carbon combustion is modeled as a series or discrete independent reactions. These processes were studied at temperatures up to 1000 °C (1832 °F), for oxygen partial pressures between 0.05 and 0.50 and for heating rates between 5 and 40 °C/min (9-72 °F/min). The results show that carbon combustion can be modeled by a series of at least three processes; the weights (fractions) of which are a function of temperature and not a function of oxygen partial pressure. Such detailed combustion kinetics are relevant for the post processing of fly ash to produce materials suitable for use as concrete admixtures or in the manufacture of sintered artificial aggregate or similar densified structures based on fly ash. Such are low temperature, low heating rate processes relative to coal combustion power generation applications. 相似文献
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为克服燃煤发电过程排放的NOx对人体和环境的危害,低氮煤粉燃烧器得到广泛的使用.但如果低氮煤粉燃烧器利用不当,会造成飞灰碳的大幅增加.利用筛分法和烧失量法研究双通道低氮煤粉燃烧器飞灰碳的分布特性,利用压汞仪和XRD分析飞灰碳的失活程度,从而研究双通道低氮煤粉燃烧器飞灰碳升高的原因.结果表明,双通道低氮煤粉燃烧器飞灰碳为双峰分布,小粒径飞灰碳失活不明显,大粒径飞灰碳失活明显.分析原因后认为:小粒径煤粉颗粒在燃烧区域停留时间过短,没有完全燃烧;大粒径煤粉颗粒在高温乏氧区域停留时间过长导致的失活是双通道低氮煤粉燃烧器飞灰碳升高的主要原因. 相似文献
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矸石电厂粉煤灰理化特性研究 总被引:5,自引:1,他引:4
以陕西某矿矸石电厂的湿排粉煤灰为研究对象,采用化学分析、激光粒度分析、X衍射、扫描电子显微镜等测试手段,研究了粉煤灰的理化特征.研究表明,矸石电厂粉煤灰颗粒较粗,以20~70 μm的颗粒为主,颗粒形状不规则,球形颗粒较少;化学组成以氧化硅、氧化铝和氧化铁为主,含量超过70%,属于低钙灰,烧失量不满足国家标准三级灰要求;粉煤灰由大量的多孔玻璃体、碳粒以及少量晶体矿物所组成,矿物组成主要为石英,还有少量的莫来石、赤铁矿. 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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Study of loss-on-ignition anomalies found in ashes from combustion of iron-rich coal 总被引:1,自引:0,他引:1
Samples of a fly and a bottom ash, each before and after ignition at 960 °C, have been studied by X-ray diffraction, Mössbauer spectroscopy, carbon analysis, and thermogravimetric analysis with the aim to explain an observed negative loss on ignition. Ashes after ignition contain more maghemite resulting from oxidation of newly formed magnetite. Moreover, the fly ash that already contained magnetite exhibited an increase of hematite after ignition. Hercynite present in both ashes transforms to hematite and magnetite after the ignition. All these oxidation processes are responsible for a weight gain which may compensate the loss due to the burning of the remaining carbon in the ashes. Also, α-Fe is formed after ignition which may have originated from wustite. 相似文献