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中文摘要：
为研究燃煤发电机组中省煤器的参数分布特性,提出了一种新型的分层机制模型。该模型不需增加新的输入参数,即可通过模型各层间的耦合关系推算出省煤器内部热力参数沿烟气流动方向的分布。以某600 MW燃煤发电机组省煤器的实际运行数据为例,验证分层模型的准确性和计算精度。计算了该省煤器不同负荷时的主要热力参数分布。假设漏风与积灰2种故障工况,分析这些工况对省煤器的运行状态的影响。结果表明,漏风会使排烟温度下降,而积灰会使排烟温度上升;漏风的空间位置影响漏风的作用效果,同程度不同位置的漏风对整体性能的影响可相差71.6%,积灰的空间位置几乎不影响积灰对整体性能的作用效果。
英文摘要：
A multizone model was developed for analyzing the parameter distribution of an economizer. The model enables the calculation of the parameter distribution on the flowing direction of the economizer without new inputs. The accuracy of the model was validated by the operating data obtained from the economizer in a 600 MW boiler unit. The model calculates the parameter distributions and analyzed the operating characters of the economizer during air leakage and fouling conditions successfully. The application shows that air leakage and fouling have an opposite influence on the outlet temperature of gas; the different leakage location varies the heat transfer reduction of the economizer over 71.6%. The location of the fouling almost does not affect the overall performance of the economizer.
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