论文部分内容阅读
针对700 MW锅炉低氮运行主、再热蒸汽温度偏低、再热器壁面易超温以及高负荷下升负荷过程中再热蒸汽温度波动大的问题,分析了其原因,并提出了降低运行氧量,减小AA风摆角偏差,和燃烧器上摆角度基准值,调整升、降负荷APC过程的热工系数的优化控制方法。优化后,锅炉高负荷下主蒸汽温度达到设计值,两侧偏差基本消除,再热器壁面13点超温次数减少;中低负荷下,再热蒸汽温度明显升高,偏差减小;高负荷下升降负荷过程中,再热蒸汽温度波动减小。同时,由于降低了氧量,排烟损失减小,锅炉效率有所提高,NOx排放量也降低。这些有效地提高了锅炉机组的安全、经济和环保性能。
Aiming at the problem that the main and reheat steam temperature of the 700 MW boiler is low, the reheater wall is prone to over-temperature and the reheat steam temperature fluctuates greatly during the high-load and low-load, the reason is analyzed. Oxygen, reducing the deviation of the AA wind angle, and the burner angle reference value to adjust the rise and fall load APC process thermal coefficient of the optimal control method. After optimization, the main steam temperature reaches the design value under the high load of the boiler, the deviation on both sides is basically eliminated, and the over-temperature times at the reheater wall surface are reduced at 13 o’clock. The reheat steam temperature is obviously increased and the deviation is reduced under low and medium loads; During the ascent and descent load, the temperature of the reheat steam decreases. At the same time, NOx emissions have been reduced due to reduced oxygen consumption, reduced exhaust losses, improved boiler efficiency and NOx emissions. These effectively improve the safety, economic and environmental performance of the boiler unit.