超超临界锅炉运行氧量优化调整

Operation oxygen optimization and adjustment for ultra supercritical boiler

华电莱州发电有限公司#1超超临界锅炉实际运行中存在两侧氧量偏差大、再热器减温水量偏高、过热器管壁超温和受热面高温腐蚀等问题,为解决该问题,对该锅炉的氧量进行优化调整试验。进行了锅炉氧量均匀性调整试验及950,800 MW工况变氧量试验,得出了不同工况下的最佳运行氧量及氧量临界值。优化后,飞灰中碳的质量分数及CO体积分数有效降低,过热器管壁超温及受热面高温腐蚀问题得到缓解,大幅度提高了锅炉的经济性。

Some problems exist in the operation of the No. 1 ultra supercritical boiler of Huadian Laizhou Power Generation Company Limited,such as the large deviation of oxygen on the both sides of boiler,the higher attemperating water volume of reheater,the overtemperature of superheater tube wall and the high temperature corrosion of heating surface,etc. In order to solve these problems,an oxygen optimization and adjustment test of the boiler was conducted. In this paper,a boiler oxygen uniformity adjustment test and variable oxygen volume tests under950 MWand 800 MW conditions were conducted,and the optimum operation oxygen volume and critical value of oxygen under different conditions were obtained. After the optimization,the mass fraction of carbon in fly ash and the volume fraction of CO are effectively reduced,the problems of overtemperature of superheater tube wall and high temperature corrosion of heating surface are alleviated,which greatly improve the efficiency of the boiler.