论文部分内容阅读
富氧燃烧技术是燃煤CO2减排最有应用前景的技术之一。煤粉/生物质富氧下的混燃,不仅可以实现CO2的零排放,更是由于生物质的引入相当于实现大气中CO2的捕集而具有重要的应用价值。以某600MW煤粉炉为例,进行了煤粉/生物质富氧燃烧的热力特性分析和锅炉结构优化设计,并与空气燃烧下各性能参数进行了对比。结果表明:富氧燃烧下,烟气量、锅炉效率和燃煤量随着生物质输入热量的增加均略有降低;相比空气燃烧,富氧燃烧下单位时间烟气量减少,燃煤量减少,锅炉辐射换热增强,对流换热量降低。优化设计后富氧燃烧下锅炉主体尺寸减小,受热面布置发生较大变化。
Oxyfuel combustion technology is one of the most promising technologies for coal-fired CO2 reduction. Pulverized coal / biomass oxygen enrichment can not only achieve zero emissions of CO2, but also has important application value because the introduction of biomass is equivalent to the capture of atmospheric CO2. Taking a 600MW pulverized coal fired boiler as an example, the thermodynamic analysis of the pulverized coal / biomass oxygen-enriched combustion and the optimization design of the boiler structure were carried out and compared with the performance parameters under air combustion. The results showed that the flue gas quantity, boiler efficiency and coal burning quantity decreased slightly with the increase of input heat of biomass under oxy-fuel combustion. Compared with air combustion, the flue gas quantity per unit time under oxy-fuel combustion decreased, Reduce the boiler radiation heat transfer enhancement, convection heat reduction. After the optimal design, the size of the main body of the boiler under oxygen-enriched combustion is reduced, and the layout of the heating surface is greatly changed.