摘要
W型火焰锅炉调节复杂,炉内的流场、温度分布不均,燃烬度差、过再热器易超温等,在W型锅炉上开展基于燃烧检测的建模和引入辐射能信号的燃烧优化控制研究有现实意义。
选取燃料量、汽轮机调门开度、减温水量、给水量为模型输入,主蒸汽压力、发电机输出功率、一级过热蒸汽温度、汽包水位为模型输出,建立以辐射能信号为中间量的锅炉简化模型。通过现场的运行数据对模型仿真输出验证,表明辐射能信号能够较好的反映该W型炉内的燃烧,且辐射能信号的引入对机组重要控制参数无异常影响,理论上验证了辐射能信号参与该W型锅炉燃烧优化控制是可行的。
在邯峰电厂#2 W型火焰锅炉上展开引入辐射能信号的燃烧优化控制现场研究,首先分析辐射能信号与现场运行数据的关联性,然后手动调整风量模拟氧量寻优试验,最后设置优化的参数将辐射能信号引入氧量-风量控制回路。在典型的低、中、高负荷下进行了引入辐射能信号进行燃烧优化前后的对比试验,证实了引入辐射能信号参与控制后炉内燃烧更加完全,锅炉效率有明显的提高,同时在一定程度上抑制了污染物的排放,对辐射能信号参与燃烧优化控制技术在更广阔的领域的应用起到了巨大的推动作用。
It is necessary to take the appropriate technical means to improve the combustion efficiency, because of W-shape boiler’s complicated regulation, inefficient combustion, the over-temperature of superheated steam temperature. Under such situations, Image processing-based monitoring and optimal control of combustion is a good choice.
Model’s building selection are as follows, main steam pressure, load, superheated steam temperature, drum water level , radiation signal as an intermediate variable. The model simulation results can be validated through the running data, which indicate that the radiation signal is capable of reflecting the burning of furnace, without exception influence of the important control parameters by the introduction of radiation signal into the control loop, and verify that the radiation signal can be introduced for combustion optimization.
We launched the introduction of the radiation signal on the combustion optimization in Hanfeng Power Plant’s 2 # W-shaped boiler. At first, we analysis the relevance of the radiation signal and unit’s control parameters. And then manually adjust the air flow simulation of oxygen optimization test, finally set the parameters to optimize the radiation signals into oxygen - air flow control loop .Through the comparison of optimal combustion control as introducing RES into DCS in a W-shaped boiler under the typical low, medium and high load, we confirm that introducing RES into DCS can improve the boiler’s efficiency significantly and inhibit the emission of NOx at some extent. This research on Hanfeng Power Plant’s 2 # W-shaped boiler plays a significant role in promoting the radiation signal control technology in a wider field of application.
引文
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