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首页> 外文会议>POWER-GEN Europe 2003 >THE ADVANTAGES OF A SUPERCRITICAL CIRCULATING FLUIDIZED BED BOILER
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THE ADVANTAGES OF A SUPERCRITICAL CIRCULATING FLUIDIZED BED BOILER

机译：超临界循环流化床锅炉的优势

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Modern power plants are designed not only for high efficiency for economical reasons butrnalso for enhanced environmental performance in terms of reduced fuel needs, quantity ofrnash generated, and pollutants emitted. Cutting CO_2 has also been a focus of attention. Tornachieve these goals, supercritical steam parameters have been applied. Most largernEuropean thermal power plants built for fossil fuels such as coal and brown coal over thernlast decade have had supercritical steam parameters and have been based on pulverizedrncoal fired once-through boiler technology.rnCirculating fluidized bed (CFB) boiler technology based on natural circulation has reachedrnutility scale over the last decade. Plants sizes up to 300 MWe are in operation. A naturalrndevelopment is to take the technology a step further with larger sizes and supercriticalrnsteam parameters. CFB boilers have features that make them advantageous to use in arnonce-through mode. One advantage of the CFB is its insensitiveness to fuel compositionrnvariations and its fuel flexibility. The even combustion characteristic of the thermal wheelrnensures minimum tube temperature unbalance despite variations in fuel properties. Multifuelrncapability is also an inherent characteristic of a CFB and naturally also in a boiler withrnsupercritical steam parameters. These are clear advantages for plant owners, as fuelrnproperty variations and availability will not become an issue but give owners a greaterrndegree of freedom to use the most economical fuel available. Other positive features arernthe low gaseous emission capability of CFB boilers without additional flue gas cleaningrnequipment and lower water/steam pressure losses due to the Benson Vertical Low MassrnFlux Technology developed by Siemens.rnThe paper describes these advantageous features in a 460 MWe boiler concept. ThernSiemens low mass-flux Benson vertical once-through technology for a CFB boiler isrndescribed in more detail. Special emphasis is laid on furnace behaviour in variousrnsituations, such as uneven firing or load changes. The effect of variations in furnacerntemperature on the water/steam circuit and the boiler tube temperature profiles are shown.rnThe results from simulations and testing are presented.
机译：现代发电厂的设计不仅出于经济方面的考虑，而且出于降低燃料需求，减少粉煤灰产生量和排放污染物的考虑，还旨在提高环境性能。削减CO_2也是关注的焦点。为了达到这些目标，已经应用了超临界蒸汽参数。在过去的十年中，欧洲最大的以化石燃料（例如煤和褐煤）建造的热电厂具有超临界蒸汽参数，并以粉煤为燃料的直流锅炉技术为基础。基于自然循环的循环流化床（CFB）锅炉技术已经达到了一定的可靠性。过去十年的规模。规模最大为300 MWe的工厂正在运营。一个自然的发展是，以更大的尺寸和超临界蒸汽参数使该技术更进一步。 CFB锅炉的功能使其可以在“纵贯”模式下使用。 CFB的优点之一是它对燃料成分变化不敏感并且具有燃料灵活性。尽管燃料特性有所变化，但热轮的均匀燃烧特性可确保最小的管温失衡。多燃料能力也是CFB的固有特性，自然也适用于具有超临界蒸汽参数的锅炉。这些对于工厂所有者来说是明显的优势，因为燃料属性的变化和可用性将不会成为问题，而是为所有者提供更大的自由度，使其可以使用最经济的燃料。其他积极的特点是CFB锅炉的气体排放能力低，而无需额外的烟道气净化设备，并且由于西门子开发的Benson立式低质量通量技术而降低了水/蒸汽压力损失。本文在460​​ MWe锅炉概念中描述了这些有利的特性。详细介绍了CFB锅炉的ThenSiemens低质量通量Benson立式直流直通技术。特别强调炉子在各种情况下的行为，例如燃烧不均匀或负荷变化。显示了炉温变化对水/蒸汽回路和锅炉管温度曲线的影响。给出了模拟和测试的结果。

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