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首页> 外文期刊>Journal of Energy Resources Technology >Modeling Time Variations of Boiler Efficiency
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Modeling Time Variations of Boiler Efficiency

机译：锅炉效率时间变化建模

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摘要

Boiler's efficiency is one of the important performance indicators of boiler. To keep track of operation cost, efficiency needs to be calculated with adequate accuracy by employing effective mathematical tools. In this work, a new modification in conventional mathematical formulation of efficiency is presented based on time-varying efficiency using time-varying operational variables of boiler. This modification was accomplished using indirect method of efficiency by applying experimental data of variables for certain time span. Moreover a second-order dynamic model of flue gas temperature (FGT) has been derived to construct the mathematical formulation of efficiency only in terms of available inputs. The resulting input-output-based model proved to be in quite agreement with efficiency calculated from experimental data. After modeling, influence of variations in air to fuel ratio (AFR) and fuel flow rate (FFR) upon efficiency has been discussed and it has been shown that time-varying efficiency covers deeper aspect of dynamic relation between efficiency and other input of boiler especially AFR and FFR. Moreover, it has been established that efficiency interacts with the dynamics of boiler, and in this respect, a dynamic relation between combustion process and boiler dynamics has been constructed via efficiency.
机译：锅炉的效率是锅炉的重要性能指标之一。为了跟踪运营成本，需要使用有效的数学工具以足够的精度计算效率。在这项工作中，基于锅炉使用时变操作变量的时变效率，提出了对效率的常规数学公式的新修改。通过应用特定时间范围内变量的实验数据，使用间接效率方法完成了此修改。此外，已经导出了烟气温度（FGT）的二阶动态模型，以仅根据可用输入来构建效率的数学公式。结果证明，基于输入-输出的模型与根据实验数据计算出的效率非常吻合。通过建模，讨论了空燃比（AFR）和燃料流量（FFR）的变化对效率的影响，并表明时变效率涵盖了效率与锅炉其他输入之间动态关系的更深层次，特别是AFR和FFR。此外，已经确定效率与锅炉的动力学相互作用，并且在这方面，燃烧过程与锅炉动力学之间的动力学关系已经通过效率而建立。

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