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Mathematical modelling of straw combustion in a 38 MWe power plant furnace and effect of operating conditions

机译：38 MWe发电厂炉中秸秆燃烧的数学模型及运行条件的影响

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摘要

As one of the most easily accessible renewable energy resources, straw can be burned to provide electricity and heat to local communities. In this paper, mathematical modelling methods have been employed to simulate the operation of a 38 MWe straw-burning power plant to obtain detailed information on the flow and combustion characteristics in the furnace and to predict the effect on plant performance of variation in operating conditions. The predicted data are compared to measurements in terms of burning time, furnace temperature, flue gas emissions (including NO_x), carbon content in the ash and overall combustion efficiency. It is concluded that straw burning on the grate is locally sub-stoichiometric and most of the NO is formed in the downstream combustion chamber and radiation shaft; auxiliary gas burners are responsible for the uneven distribution of temperature and gas flow at the furnace exit; and fuel moisture content is limited to below 25 percent to prevent excessive CO emission without compromising the plant performance. The current work greatly helps to understand the operating characteristics of large-scale straw-burning plants.
机译：作为最容易获得的可再生能源之一，可以燃烧秸秆为当地社区提供电和热。在本文中，已经采用数学建模方法来模拟38 MWe秸秆燃烧发电厂的运行，以获得有关炉内流量和燃烧特性的详细信息，并预测运行条件变化对电厂性能的影响。将预测数据与燃烧时间，炉温，烟气排放量（包括NO_x），灰分中的碳含量和总体燃烧效率等方面的测量结果进行比较。结论是，炉排上的秸秆燃烧是局部低于化学计量的，大部分NO形成在下游燃烧室和辐射井中。辅助燃气燃烧器是造成炉膛出口温度和气流分布不均匀的原因。并且燃料水分含量应控制在25％以下，以防止过量的CO排放而不会损害工厂的性能。当前的工作极大地有助于了解大型秸秆焚烧厂的运行特性。

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