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低氮燃烧改造后的锅炉,低氮燃烧和非低氮燃烧模式的切换使得汽温的变化幅度增加,汽温控制中需要的减温水量变化幅度增大。针对这些特性,提出利用蒸汽焓值计算平衡热势能的汽温预估控制算法,计算得到不同工况下所需的减温水量,采用汽温设定值自动分配算法以及壁温自动修改设定值算法,对各级汽温设定值进行实时整定,利用“主蒸汽温度控制中二级减温水阀门位置自寻优方法”的控制技术,对末级以前的减温控制设定值进行自动设定,实现锅炉在各种负荷情况下的汽温精确控制,明显提升汽温自动控制的性能,实现了各级减温水的自动分配,降低了汽温和壁温的超温次数。
The low-nitrogen combustion boiler, low-nitrogen combustion and non-low-nitrogen combustion mode switch makes the steam temperature range of change, the temperature control of the water temperature required for the amount of change increases. In view of these characteristics, a steam temperature predictive control algorithm using steam enthalpy to calculate the equilibrium thermal potential energy is proposed to calculate the required water temperature reducing capacity under different operating conditions. The automatic temperature distribution setting algorithm and the automatic temperature wall temperature setting Value algorithm, the steam temperature settings at all levels set in real time, the use of “main steam temperature control valve in the second grade warm water from the search method of self-optimization,” the control technology, the end of the previous temperature control set point Automatically set to achieve the boiler under various load conditions of the precise control of steam temperature, significantly improve the performance of automatic control of steam temperature to achieve the automatic distribution of water at all levels to reduce the steam temperature and wall temperature over-temperature frequency.