600 MW超临界对冲锅炉燃烧优化调整试验

Experimental study on combustion optimization and adjustment of 600 MW supercritical hedging boiler

针对某600 MW超临界对冲锅炉在运行中出现的飞灰、大渣含碳量高、垂直水冷壁超温等问题进行调整试验。从制粉系统、运行氧量、配风方式、燃烧器调整等方面对锅炉进行优化调整,发现影响锅炉灰渣含碳量高、水冷壁超温的因素主要有一次风速偏差、煤粉细度、运行氧量、二次风配风方式、内二次风旋流强度。建议运行中将磨煤机动态分离器转速控制在130 r/min左右,二次风采用正塔配风方式,燃烧器内二次叶片开度控制在50°。随着运行氧量的增加,飞灰、大渣含碳量明显降低,550 MW工况下建议表盘氧量维持3.3%左右。研究结果可为同类型机组优化运行提供借鉴。

In view of the problems of fly ash,large slag with high carbon content,and over-temperature of the vertical water wall during operation of a 600 MW supercritical hedging boiler,corresponding adjustment tests were carried out.The boiler is optimized and adjusted from the aspects of pulverizing system,operating oxygen,burner adjustment,etc.,and finally it is concluded that the factors affecting the high carbon content of boiler ash and slag and the over-temperature of the water wall mainly include primary wind speed deviation,coal fineness,operation oxygen,secondary air distribution content and swirl intensity of internal secondary wind.It is suggested that the rotational speed of the dynamic separator of the coal mill should be controlled at about 130 r/min,and the opening of the secondary blades in the burner should be controlled at 50°.With the increase of operating oxygen content,the carbon content of fly ash and large slag is significantly reduced.It is recommended that the dial oxygen content be maintained at about 3.3%under 550 MW operating conditions.The research results can provide guidance for the optimal operation of the same type of units.