燃煤电厂锅炉最低稳燃负荷估算方法

Estimation Method of Boiler Minimum Combustion Stable Load Rate of Coal-Fired Power Plant

[目的]项目实施前需要预评价燃煤电厂灵活性运行的性能,其中包括锅炉最低稳燃负荷技术指标的预测。原有的经验和算法不能满足电厂灵活性评价需求,需结合目前设备能达到的性能指标,拟定新的锅炉最低稳燃负荷的半经验计算曲线。[方法]结合文献资料与工程经验,选取与稳燃指标关联性强的参数,采用统计和回归的方法,拟合出半经验计算曲线。[结果]以煤的挥发分Vdaf、燃烧器总出力裕量系数φ作为自变量,并结合最小点火能量的统计分析值,可得到锅炉最低稳燃负荷的理论指标。[结论]新的计算曲线以工程资料可获得的已知参数作为输入,可相对精确地测算出不同条件下锅炉最低稳燃负荷的理论值,与实际运行试验数据吻合,可作为工程设计的工具。

[Introduction]Before the project implementation,it is required to pre-evaluate the degree of flexible operation of coal-fired power plants,including the prediction of the technical index of boiler minimum combustion stable load rate.Since the existing experience and algorithms cannot meet the flexibility evaluation requirements of power plants,it is necessary to draw up a new semi-empirical calculation curve of the boiler minimum combustion stable load rate in combination with the performance index that the current equipment can achieve.[Method]Based on the literature data and engineering experience,the parameters with strong correlation with stable combustion index were selected,and statistical and regression methods were used to fit the semi-empirical calculation curve.[Result]With Vdaf(volatile matter of coal)andφ(total output margin coefficient of the burner)as independent variables,combined with the statistical analysis value of minimum ignition energy,the theoretical index of boiler minimum combustion stable load rate can be obtained.[Conclusion]The new calculation curve takes the known parameters available from the engineering data and can accurately calculate the theoretical value of boiler minimum combustion stable load rate under different conditions,which is consistent with the actual operation test data and can be used as tool for engineering design.