循环流化床锅炉机组变负荷过程能量变迁研究

Research on Energy Conversion of a CFD Boiler Unit During Load Change Process

研究了循环流化床(CFB)锅炉机组能量变迁过程,在分析CFB锅炉蓄能动态特性的基础上,对动态过程中的能量转换进行了定量计算与比较,将经济给煤量与实际给煤量进行比较,得到经济给煤评价指标,并以此来考察锅炉动态过程的控制效果.利用主蒸汽压力波动来反映动态过程的能量平衡,并通过2个升负荷过程实例进行了工程验证.结果表明:研究CFB锅炉机组的能量变迁,采用经济给煤评价指标指导风煤配比,对动态过程中的CFB锅炉机组安全、稳定、经济运行具有重要意义,为变负荷控制提供了理论基础.

The energy conversion in dynamic process of a CFB boiler unit was studied,calculated and compared quantitatively based on analysis of the energy storage features,so as to obtain the evaluation index of economical coal feed rate through comparison between the economical and actual coal feed rate,and to investigate the effects of dynamic process control.In addition,the fluctuation status of main steam pressure was used to reflect the dynamic energy balance,which was verified by two examples of load-up processes.Results show that both the study of energy conversion in the process of CFB boiler load changes and the application of evaluation index for economical coal feed rate in the control of air-coal ratio are conducive to the safe and economic operation of the CFB boiler.This may serve as a reference for the control of boiler load changes.