运行中电站锅炉入炉煤元素组成的理论计算

Theoretical Calculation of Coal Ultimate Analysis for an Operating Thermal Power Plant

提出了一种计算运行中的电厂入炉煤元素组成以及其它重要参数的数学模型,包括利用脱硫装置进行S_(ar)估算、利用制粉系统计算M_(ar)和汽机回热系统和锅炉减温水系统对锅炉输出热量进行求解,最终采用牛顿-拉夫森迭代法对主方程组求解得出C_(ar)、H_(ar)、O_(ar)、N_(ar)、A_(ar),Q_(net,ar)(煤的发热值)、η(电锅厂炉效率)。利用电厂运行数据并借助该计算方法,能够得到入炉煤元素组成和锅炉效率等结果,为进一步实现电站设备的在线能效诊断及评价,提升电站设备运行管理水平奠定理论基础。

This paper put forward a method to calculate the ultimate analysis of coal and other crucial parameters in order toobtain the actual fuel consumption level of thermal power plants during the operation. The Sar was estimated from the desulfidation unit,and Mar was obtained from coal pulverized system,while the Boiler output was calculated through regenerative system and desuperheating system. Then the equation systems of general framework set were solved by Newton-Raphson iteration to obtain parameters of C_(ar)、H_(ar)、O_(ar)、N_(ar)、A_(ar),Q_(net,ar)、and η(efficiency of boiler). Combining the operation data of power plant with this method,the coal ultimate analysis and boiler efficiency can be obtained. This study is expected to provide a theoretical foundation for the further implementation of the online energy efficiency diagnosis and evaluation for power plant and for the enhancement in the management level of the operating equipments.