基于超超临界锅炉O_2/CO燃烧控制技术研究

Research on O_2/CO Burning Control Technology for Ultra Supercritical Boilers

为了确定最佳的燃烧工况,通过采集某电厂1 036 MW机组锅炉1个月运行数据分析,发现高负荷时烟气排放CO偏大,额定负荷时最大影响锅炉效率0.6%,导致供电煤耗增大,严重影响锅炉运行的安全性及效率。针对燃用设计煤及燃用混煤的锅炉,燃烧状态变化易造成燃烧不稳定及参数波动大、锅炉效率降低等问题,通过分析燃烧特性曲线,试图从反平衡计算出发,基于燃烧控制技术和自适应优化控制技术,通过寻优,实现各阶段负荷下锅炉效率最高、煤耗最低的燃烧工况。

In order to determine the best burning condition, by analyzing the one-month running data of a 1036-MW unit in a power plant, it is discovered that the CO content in the flue gas is too high under high load conditions and the maximum fluctuation of the boiler efficiency is 0.6% at rated load, which leads to the increase of the coal consumption and affects the safe operation of the boiler. In boilers firing pulverized coal or mixed coal, the change of the combustion state easily causes unstable combustion, large parameter variation and boiler efficiency reduction. By analyzing the combustion characteristic curve, this paper attempts to optimize the burning conditions with the counterbalance calculation method the burning control technology and the self-adaptive optimization control technology to maximize the boiler efficiency and minimize the coal consumption at different loads.