对于电厂长期运行锅炉燃烧器粉管磨损的修正优化

Correction and Optimization of Boiler Burner Powder Tube Abrasion after Long-term Operation in Power Plant

电厂锅炉投产运行一个周期后(约5年),制粉系统出口粉管节流缩孔存在不同程度的磨损,会导致出口一次风速、风量偏离设计值,影响炉膛空气动力场分布和炉膛燃烧效率,容易造成烟气中CO排放浓度高、水冷壁局部过热、受热面磨损等问题,为此,开展制粉系统出口一次风速、一次风量诊断,修复一次粉管节流缩孔磨损,调整一次粉管节流缩孔,对于修正燃烧调整和经济燃烧会带来直接益处。基于此,本文结合电厂二期#4机组测量磨煤机出口粉管风速、粉量及调平试验,风煤比和旋转分离器转速调整试验,解决了影响磨煤机出口一次粉管风速、风量偏离的问题,该方案具有工程应用可行性。

After the operating one cycle （about 5 years） of the boiler in the power plant, there are different degrees of abrasion at the outlet of the powder pipeline, which will lead to the once wind speed and air volume deviating from the design value, affecting furnace aerodynamic field distribution and the furnace combustion efficiency, and easy to cause the higher CO emission concentration flue gas, the local water wall overheating, the abrasion of heating surface, and other problems. So, it is useful to start the once wind speed and air volume diagnosis of milling system, repair once powder pipe throat shrinkage and adjust once powder pipe throttling hole for the amendment of combustion adjustment and economic combustion. Based on this, combined with the second stage # 4 unit of the power plant measuring the wind speed and powder volume of pulverizer export powder tube and leveling experiment, as well as the air coal ratio and the rotary separator adjusting experiment, this paper solved the abrasion problem of wind speed and air volume, which has the feasibility of engineering application.