碳捕集电厂电碳耦合特性建模与分析

Modeling and Analysis of Electricity-Carbon Coordinated Characteristics in a Carbon Capture Power Plant

为获得碳捕集电厂发电和碳捕集的耦合特性,采用机理建模方法建立了脱碳抽汽流量对机组发电出力的静态特性模型,采用基于数据的辨识方法获得二者的动态模型,同时建立脱碳抽汽流量对再沸器负荷和碳捕集率的静态和动态模型,获得脱碳抽汽流量对发电侧和碳捕集侧的动态响应时间尺度,并给出碳捕集电厂电碳耦合特性及可调度区间的确定方法。结果表明:所研究300 MW机组的碳捕集率可调范围与机组所处汽轮机负荷密切相关,负荷率越高,可调范围越大;为使机组的碳捕集率不低于80%,其汽轮机负荷率不应低于83.3%。

In order to obtain the coupled characteristics of generated power and captured carbon in a carbon capture power plant,the static characteristic model of decarburization extraction steam flowrate on unit power output was established based on mechanism modeling method,and their dynamic model was furthermore developed based on data identification approach.The static and dynamic models for decarburization extraction steam flowrate on reboiler duty and carbon capture rate were established.The decarburization extraction steam flowrate responding time scales on both generated power and captured carbon were obtained.The method for determining the coupling characteristics and schedulable interval of the carbon capture power plant was given.Results show that the adjustable range of carbon capture rate is closely related to the unit turbine load on a 300 MW power.The higher the load rate is,the wider the adjustable range is.In order to ensure the carbon capture rate of the unit is not less than 80%,the turbine load rate should not be less than 83.3%.