摘要
为消除切圆锅炉炉膛出口处残余旋转 ,进而削弱烟道气流速度偏差和热力偏差 ,提出一种在炉膛出口加装十字型消旋器的新技术。试验是在某 30 0MW锅炉以 1∶13.9比例缩小的模型试验台上进行的。模型炉膛横断面尺寸为10 0 9mm× 846mm ,模型炉膛高度为 2 146mm。消旋器上端紧贴折焰角下边缘。炉膛、烟道内气流速度分布和炉膛出口残余旋转由热电风速计和五孔探针测量获得。通过对未加十字型消旋器、十字型消旋器的高度分别为 5cm、10cm和15cm下 ,炉膛、烟道中气流速度分布和阻力特性的模型试验研究得出 ,一个高度合理的十字型消旋器可显著消除炉膛出口残余旋转和烟道气流速度偏差 ,炉内气流运动时无明显阻力增加 。
In this paper,a new method,installing a kind of cross heating surface at furnace outlet of tangential firing system,has been presented to eliminate residual rotation and further to decrease the velocity deviation and thermal deviation at horizontal gas pass.A 1∶13.9 scale model experimental rig has been set up based on a 300MW utility boiler. Model furnace cross section is 1009mm×846mm,and model furnace height is 2146mm.The top end of model device is fixed at the lower end of model boiler 'nose'.Airflow velocity characteristics and the residual rotation can be measured by using a thermal electric speedometer and a five hole probe. Cold model tests about airflow velocity distribution and resistance characteristics in furnace and at horizontal gas pass have been carried out,when model devices are installed with the height of 0cm,5cm,10cm and 15cm. Results show that the cross device with a reasonable height is good for eliminating residual rotation and velocity deviation,has a less airflow resistance and takes no effect on furnace aerodynamics.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2002年第2期59-63,共5页
Proceedings of the CSEE
基金
上海市教委发展基金资助项目 ( 2 0 0 0K0 2 )
