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根据几台锅炉的实测数据推算不同煤质对不同受热面的实际灰污系数和各种受热面的实际传热系数.推算结果表明,不同煤质对受热面灰污特性的影响程度相差较大,其对锅炉运行特性的影响比较明显.所列举煤质对受热面灰污系数的影响与国外某些现行标准的推荐值有时相差较大,需要锅炉试验、设计、运行中积累数据对其进行修正. 相似文献
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基于改进BP神经网络的锅炉结渣预测模型 总被引:3,自引:0,他引:3
基于人工神经网络的改进BP算法,建立了大型燃煤锅炉对流受热面积灰结渣状况的预测模型。根据所建立的BP网络模型,对某电厂700MW机组锅炉的再热器进行了分析和计算,结果表明该模型可以准确地预测锅炉对流受热面的结渣状况,从而为优化吹灰提供指导。 相似文献
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华能德州电厂锅炉吹灰器的合理选择 总被引:1,自引:0,他引:1
通过对蒸汽吹灰器、水力吹灰器、燃气脉冲吹灰器在德州电厂6号炉应用结果的分析比较,指出大型燃煤锅炉应根据不同受热面的积灰特点及清灰需要,有针对性的选择吹灰器类型。德州电厂在锅炉吹灰器选型上的经验,值得新建燃煤机组借鉴。 相似文献
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过热器再热器壁温在线监测技术在寿命监测中的应用 总被引:1,自引:0,他引:1
大型电站锅炉过热器和再热器等高温受热面工作条件比较恶劣,炉管失效直接影响锅炉的安全经济运行,炉管损伤主要由受热面超温引起。过热器再热器壁温在线监测技术,可以通过安装少量的炉外壁温测点,实时计算整个管组各部位的金属壁温。在壁温监测的基础上,根据经典的蠕变损伤L M公式,建立了炉管寿命在线监测模型,并开发了过热器再热器线寿命监测和管理系统,并将该系统应用于300MW电站锅炉,为电站锅炉的安全运行和状态检修工作的实施提供了有效的手段。 相似文献
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燃煤锅炉对流受热面污染沉积对传热熵产的影响 总被引:3,自引:1,他引:2
火电站燃煤锅炉运行中受热面污染沉积使传热过程不可逆程度增大,熵产增加,能量品质下降。文中建立了锅炉对流受热面传热熵产计算模型,并针对一台大型电站锅炉,结合现场采集的实时运行数据,利用建立的熵产模型计算了各对流受热面在不同污染状态下(吹灰操作前后)的传热熵产,分析了不同受热面污染对熵产的影响规律。计算与分析表明,对于所计算的锅炉,与其他受热面相比,吹灰操作对降低省煤器和低温过热器传热熵产的效果最为显著。 相似文献
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电厂锅炉高温段受热面管内氧化皮的生成和脱落已经成为影响机组安全运行的世界性的问题之一,很多人认为使用等离子体煤粉燃烧器启动会促使氧化皮的生成和脱落。事实上,氧化皮的生成、脱落确实与启、停速率有关。从锅炉的启停方式、初始投入功率和后续输入功率的速率、运行调整等方面进行详细的阐述和分析。从数百台安装等离子体煤粉燃烧器锅炉的启停经验来看,特别是超(超)临界机组,在锅炉启动过程中,只要满足锅炉的升温升压曲线,适当调整初始投入功率和后续投入功率的速率以及运行方面的调整,就不会加速锅炉高温受热面管内氧化皮的生成和脱落。 相似文献
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高温金属材料的研制和开发是发展亚临界、超临界锅炉技术的必要条件。在材料研究领域,通过在传统锅炉用钢的基础上添加Cu、P、B、Ni等合金元素,提高了钢材的高温性能。通过对这些合金元素的强化效果和强化机理进行深入分析,讨论了超临界锅炉不同受热面的性能要求及各种高温合金钢的适用性,为超临界锅炉选材提供了理论参考。 相似文献
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S. Yu. Suslov A. V. Kirilina I. A. Sergeev T. V. Zezyulya E. A. Sokolova E. V. Eremina N. V. Timofeev 《Thermal Engineering》2017,64(3):237-241
Amines for a long time have been applied to maintaining water chemistry conditions (WCC) at power plants. However, making use of complex reagents that are the mixture of neutralizing and the filmforming amines, which may also contain other organic components, causes many disputes. This is mainly due to lack of reliable information about these components. The protective properties of any amine with regard to metal surfaces depend on several factors, which are considered in this article. The results of applying complex reagents to the protection of heating surfaces in industrial conditions and estimated behavior forecasts for various reagents under maintaining WCC on heat-recovery boilers with different thermal circuits are presented. The case of a two-drum heat-recovery boiler with in-line drums was used as an example, for which we present the calculated рН values for various brands of reagents under the same conditions. Work with different reagent brands and its analysis enabled us to derive a composition best suitable for the conditions of their practical applications in heat-recovery boilers at different pressures. Testing the new amine reagent performed at a CCPP power unit shows that this reagent is an adequate base for further development of reagents based on amine compounds. An example of testing a complex reagent is shown created with the participation of the authors within the framework the program of import substitution and its possible use is demonstrated for maintaining WCC of power-generating units of combined-cycle power plants (CCPP) and TPP. The compliance of the employed reagents with the standards of water chemistry conditions and protection of heating surfaces were assessed. The application of amine-containing reagents at power-generating units of TPP makes it possible to solve complex problems aimed at ensuring the sparing cleaning of heating surfaces from deposits and the implementation of conservation and management of water chemistry condition on the TPP equipment. 相似文献
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金属蒸汽侧氧化膜的生长和剥落对超临界或超超临界锅炉高温受热面的安全性有直接影响。以2台600MW超临界锅炉为对象,详细分析因蒸汽侧氧化膜剥落所导致的高温过热器爆管事故,介绍实际运行中所采取的提高高温受热面安全性的技术措施。在此基础上,以T91和TP347HFG管材为例,针对设备改造设计提出基于金属蒸汽侧氧化膜生长和剥落规律评价高温受热面金属安全性的方法,并应用于这2台锅炉高温过热器的实际改造方案的安全性评价,评价结果表明改造方案可以实现高温过热器在一个大修期内安全运行的预定目标,同时给出进一步优化改造方案的建议。研究结果对于制定锅炉检修计划和安全运行技术措施具有指导意义。 相似文献
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A formula is proposed using which attenuation of the level of acoustic power in a heat-recovery boiler can be calculated as
a function of the area of its heat-transfer heating surfaces. The silencers developed by specialists of the Moscow Power Engineering
Institute for additional suppression of noise emitted from combined-cycle and gas turbine units equipped with heat-recovery
boilers are considered. 相似文献
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The design features of new hot-water water-tube boilers with capacities of 7.56, 11.63, 23.26, and 35.0 MW fitted with heating
surfaces made of all-welded membrane panels and finned tubes are described together with the technical principles used for
developing them. 相似文献
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The type selection of burning equipment for boilers is affected significantly by the slagging characteristics of coal.Based on the engineering statistics method,the designed furnace parameters are obta... 相似文献
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运河发电厂2台SG440/13.7M562循环流化床锅炉自投运以来出现了一些问题,如炉内受热面磨损、过热器超温、冷渣器排渣困难、给煤机堵煤、非金属膨胀节损坏等。文章分析了产生这些故障的原因,并提出了对循环流化床设备进行整改和运行调整的措施。实践表明,经整改和调整后运河发电厂循环流化床锅炉的安全性和可靠性都得到了一定提高。 相似文献