Dynamic modelling of oxyfuel power plant
Dynamic modelling of oxyfuel power plant
复制标题
富氧电厂动态建模
DOI：
10.1016/j.egypro.2011.02.151
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
Kuczynski K
中科院分区：
文献类型：
--
作者：
Kuczynski K
富氧燃烧技术是目前正在开发的几种碳减排技术（CAT）之一。该技术提供了一种产生富含二氧化碳的烟道气的方法，在封存或有益应用之前需要最少的处理。氧燃料工艺的基础是从燃烧过程中排除空气中的惰性成分（主要是氮气）。在富氧燃料燃烧中，烟道气中基本上不存在氮气，因为燃料与几乎纯的氧气（在空气分离单元（ASU）中从空气中分离出约95%的O2）和富含CO2的再循环烟道气的混合物一起燃烧。它被公认为是新的和改造发电厂的领先碳捕集技术。斗山动力系统公司、空气产品公司、爱丁堡大学和其他公司之前进行的研究表明，无论是在设计阶段还是在正常运行期间，都有很大的空间来优化整个工厂的效率。因此，目前的工作旨在实现这些好处，通过采用优化设计和适当的控制和动态优化策略的发展。在富氧燃烧工艺中回收烟道气产生了许多在传统的空气燃烧发电厂系统中看不到的操作和控制特性。作为TSB合作项目“富氧PF电厂瞬态行为优化”的一部分，正在开发富氧工艺系统和相关控制的综合动态模型，以研究这些方面。富氧燃料专用模型与锅炉和涡轮机系统的全循环、非线性、动态模型相耦合，从而可以开发控制方案，满足富氧燃料电厂的全范围运行要求和能力。该模型的早期结果表明，在富氧模式下运行可能会提供一个机会，以提高工厂的灵活性和主要和次要的响应，这是一个能力，这是越来越重要的传统，核能和可再生能源发电的组合变化。
Oxyfuel combustion technology is one of several Carbon Abatement Technologies (CATs) currently being developed. The technology offers a means of generating carbon dioxide rich flue gas requiring minimal treatment prior to sequestration or beneficial application. The oxyfuel process is based on excluding the inert components (mainly nitrogen) of air from the combustion process. In oxyfuel combustion, nitrogen is largely absent from the flue gas, since the fuel is combusted with a mixture of nearly pure oxygen (∼95% O2-separated from air in an air separation unit (ASU)) and CO2rich recycled flue gas. It is recognised as a leading Carbon Capture technology for new and retrofit power plant. Previous studies undertaken by Doosan Power Systems, Air Products, University of Edinburgh and others have shown that there is significant scope to optimise overall plant efficiency, both at the design stage and during normal operation. Therefore the current work seeks to realise these benefits through the adoption of optimised designs and the development of appropriate control and dynamic optimisation strategies. Recycling flue gas in the Oxyfuel process gives rise to a number of operational and control features not seen in conventional air-fired power plant systems. Comprehensive dynamic models of the Oxyfuel process systems and associated controls are being developed as part of the TSB collaborative project “Optimisation of Oxyfuel PF Power Plant for Transient Behaviour” to study these aspects. The Oxyfuel specific models are coupled to a whole cycle, non-linear, dynamic model of the boiler and turbine systems allowing development of control schemes, which can meet the full range of operational requirements and capabilities of the Oxyfuel plant. Early results from the model suggest that operation in Oxyfuel mode may provide an opportunity to improve plant flexibility and both primary and secondary response, a capability which is of increasing importance as the mix of conventional, nuclear and renewable generation changes.