Calculating the calorific value signal on line is the supporting Tor the optimization of boiler control and combustion. Based on the energy balance and chemical mass balance, the soft measurement of calorific value was researched, and was implemented in a 600 MW thermal power unit. The calculation results show that the energy balance method has higher static precision and worse dynamic characteristics, and the chemical mass balance method has teller dynamic characteristics and lower static precision. So an improvement of information fusion technology was proposed. A new calorific value signal with the low frequency of energy balance signal and the high frequency of the chemical mass balance signal was constructed, which can meet the requirement of static precision and dynamic response speed,%在线计算煤发热量信号能够为锅炉控制优化及燃烧优化提供支持.对比分析了基于能量平衡法和化学平衡法的煤发热量软测量方法,并在某600MW火电机组上组态实施.结果表明:能量平衡法的计算结果静态精度高但动态性差,而化学平衡法的动态特性好但静态精度低.针对此问题提出一种基于信息融合技术的改进方案,取能量平衡法信号的低频部分和化学平衡法信号的高频部分构造出一个新的煤发热量信号,能够满足现场对静态精度和动态响应速度的要求.
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