【摘要】 针对某电厂 6 70t/h锅炉出现的NOx 排放高问题 ,提出了将所有一次风改为水平浓淡煤粉燃烧器 ,并对下组上层、中组中层和中组上层二次风采用水平摆动的方案 ,从而将水平浓淡燃烧技术与二次风水平摆动相结合 .按照相似模化的原则 ,在该锅炉上进行了炉内空气动力场的试验 .1、3角二次风由正切变为反切 ,进行了 4次不同二次风摆角的试验 ,结果表明 :随着二次风摆角增大 ,前后墙炉内切圆直径由 72 0 0mm增大到 12 0 80mm ,左右墙切圆直径由 810 0mm增大到 12 10 0mm .冷态试验结果为热态试验及数值模拟研究提供了依据 .更多还原

【Abstract】 To decrease  NO x emission of a 670 t/h boiler in a power plant, the technology, with all common nozzles of burners retrofitted by nozzles of Horizontal Bias Pulverized Coal Combustion Burners and orifices of the top secondary air in the bottom group of burners,the middle and the top secondary air in the middle group of burners horizontally swinging, have been put forward. Therefore, the technology combines horizontal bias combustion and secondary air horizontal swing. Due to the scaling criteria, industrial experiments of aerodynamic field were done in the boiler. The imaginary circle rotational direction of the secondary air was changed from clockwise to reversal clockwise at No.1,3 corners, and four horizontal swing angles of orifices of the secondary air were taken. The experiment shows that diameters of tangential circles between the front and the rear walls increase from 7 200 mm to 12 080 mm and that between the left and the right walls from 8 100 mm to 12 100 mm with increase of swing angles. The cold state experimental results provide the fundament for reacting flow experiment and numerical simulation in the future.更多还原