共查询到20条相似文献,搜索用时 187 毫秒
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建立冷态空气动力场模化试验台,对不同燃烧器布置工况进行试验研究,了解六角切圆燃烧锅炉炉内空气动力特性,分析其对炉膛和受热面结渣的影响,并把研究成果应用于某200MW锅炉机组的改造中,对工程实际具有很大的应用价值。 相似文献
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建立冷态空气动力场模化试验台,对不同燃烧器布置工况进行试验研究,了解六角切圆燃烧锅炉炉内空气动力特性,分析其对炉膛和受热面结渣的影响,并把研究成果应用于某200MW锅炉机组的改造中,对工程实际具有很大的应用价值。 相似文献
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从百叶窗式水平浓淡煤粉燃烧器的结构入手,分析了其稳燃性、NOx低排放的机理,通过安阳电厂9号和10号炉燃烧器的改造情况和试验结果看,NOx低排放量、稳燃性达到了理想效果,对同类型机组有一定的参考价值。 相似文献
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针对燃煤机组深度调峰低负荷情况下着火困难、燃烧不稳定的问题,提出了一种对最上层燃烧器进行浓淡双喷口结构优化改造以达到30%负荷以下稳燃目的的方法。以1台300MW锅炉为模型,将最上层单喷口燃烧器改为总热功率与原燃烧器相同并带有浓淡分离装置的2个小型燃烧器。通过理论计算,分析了改造后燃烧器在低负荷下的着火性能,同时通过数值模拟对其燃烧情况进行分析。结果表明:改造后双喷口燃烧器更有利于低负荷下煤粉气流的着火;同时改造后炉内流场、温度场均更加稳定,炉膛内平均温度也有所上升;通过O_2、CO_2摩尔浓度分析可知燃烧更为彻底、稳定,改造后的浓淡双喷口煤粉燃烧器能满足低负荷下的着火及稳燃需求。 相似文献
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模糊综合评判模型预测电站燃煤结渣特性的研究 总被引:2,自引:0,他引:2
基于最大隶属度原则,采用常规煤质结渣特性指标以及炉膛运行参数组成的"6指标法"对模糊理论预测燃煤结渣的4种常用模型进行了分析和检验.分析发现,4种模型都具有较好的预测效果,但相比而言,具有"主因素决定型"特征的模型由于过于强调单一指标的作用效果,在评判过程中容易陷于局部最大修正隶属度的误区,从而导致对结渣倾向性不明显样本预测的失效.考虑各因素影响的综合评判方法则避开了这一误区,在整体预测效果上获得了更高的准确度. 相似文献
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基于模糊神经网络的电站燃煤锅炉结渣预测 总被引:7,自引:0,他引:7
综合运用模糊数学和神经网络知识构建了一个模糊神经网络模型,用以预测电站燃煤锅炉的结渣特性.通过引入反映煤灰特性的4个常用指标以及反映锅炉运行情况的两个指标,使所建模型综合考虑了煤灰特性和锅炉运行因素对结渣的影响.以实际电厂燃煤锅炉为样本,基于改进的BP(back-propagation)算法对网络模型进行了训练.为验证模型的准确性,对7台电站燃煤锅炉的结渣特性进行预测,并将该模型与只考虑煤灰特性指标的常规 BP网络模型进行比较.验证结果表明,模糊神经网络模型的预测结果与实际相符,效果优于常规BP网络模型. 相似文献
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为了解决燃用低灰熔点神木煤而引发的结焦问题,广州珠江发电厂对本厂动力配煤优化进行了试验和试烧,找到了不同时期适合本厂锅炉机组安全运行的动力配煤方式。通过试烧,得出在当前条件下,神木煤和保得煤以7∶3进行的混煤能够较好地防止炉膛结焦。 相似文献
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基于最大隶属度原则,采用常规煤质结渣特性指标以及炉膛运行参数组成的"6指标法"对模糊理论预测燃煤结渣的四种常用模型进行了分析和检验。 相似文献
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《能源学会志》2020,93(6):2409-2414
Biomass with high concentration of alkali/alkaline and silica components can lead to slagging/fouling, and sintering of the ash deposits, causing corrosion and erosion of the boilers. There are several methods to predict bed agglomeration such as slagging/fouling indexes. However, these indexes are developed to be used for coal ashes, which shows a different behaviour than biomass fuels. The aim of this work was to determine the suitable percentage of different species found in biomass blends in order to reduce the risk of slagging and sintering. We studied the ash behaviour of 24 blended biomass samples using two slagging indexes: the alkali index, and the % of bases in ashes index, and we validated these two indexes with the Bioslag test, and with the Hardness Index (%D1). There is low risk of slagging in most of the samples, as well as a low sintering risk. However, some samples present moderate risk of sintering possibly due to SiO2. The Bioslag test and the %D1 test support our results. Samples showing risk of sintering exceed 25% of the total accumulated ash weight percentage ac%_1P>25%, and show a hardness of %D1 > 0.7. These validations can be considered as useful tools for estimating slagging and sintering of woody biomass fuels in domestic pellet boilers. 相似文献
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《Progress in Energy and Combustion Science》1998,25(2):117-132
A predictive scheme based on CCSEM flyash data and computational fluid dynamics (CFD) was developed to study the slagging propensity of coals. The model was applied to predict the deposition potential of three UK coals; Bentinck, Daw Mill and Silverdale, in a pilot scale single burner ash deposition test facility. The project is part of a collaborative research programme sponsored by the UK Department of Trade and Industry and involved various industrial organizations and universities. The objective is to understand the fundamental aspects of slagging in pulverized coal-fired combustion systems. The present model predicts the relative slagging propensity of the three coals successfully, and the predicted deposition patterns are also consistent with the observations. The results from the model indicate a preferential deposition of iron during the initial stage of ash deposition. The average compositions of the deposits become closer to that of the bulk ash when the accumulation of ash deposits is taken into account. 相似文献
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高岭土与低钠煤可以有效抑制燃用准东煤时炉内的沾污结渣问题,但由于其价格升高,为降低电厂燃煤成本,因此提出将煤灰成分相似的煤矸石作为准东煤防结渣添加剂。分析煤矸石作为添加剂抑制炉内沾污结渣的可行性,根据入炉煤灰中折算Na2O含量低于3.0%,确定掺烧比例,并在某150 MW机组上进行实炉掺烧试验。通过掺烧试验分析可见,煤矸石掺烧比例不宜过大,否则煤粉细度变粗,入炉煤热量降低,影响锅炉带负荷能力;掺烧煤矸石锅炉能够安全稳定运行,并可有效抑制炉内结渣,同时还可节约标煤,为电厂带来一定经济效益。 相似文献