【摘要】 介绍了炉内旋流数SW的基本概念和计算方法,指出SW实际表征的是炉内气流旋转速度与上升速度之比,其大小对水平烟道处的高温受热面的热偏差情况有直接影响;就二次风配风方式、锅炉负荷和一、二次风风率对SW的影响进行了分析和讨论,并在实炉上就SW的变化对再热器热偏差的影响进行了试验研究。理论分析和试验结果显示:在同样的负荷下,二次风配风方式对SW有明显影响,均等配风时SW最小,再热器的最大热偏差系数随SW的增加而增加;在同样的二次风配风方式下,SW随锅炉负荷的降低而增加,再热器的最大热偏差系数随SW增加而增加。更多还原

【Abstract】 The basic conception and calculation method of an in boiler swirl number SW is described. The latter is actually characterized by a ratio of the gas flow swirling and rising speed in a boiler furnace with its magnitude exercising a direct influence on the thermal deviation in high temperature heating surfaces at a horizontal gas pass. The authors analyzed and discussed the impact of secondary air distribution mode, boiler load and the ratio of primary and secondary air on SW. Moreover, through a specific boiler an experimental research is conducted of the impact of SW variation on the thermal deviation in a reheater. The results of theoretical analyses and tests indicate that under identical loads the distribution mode of secondary air has a significant influence on SW with SW assuming a minimum value under the condition of a uniform air distribution. The maximum thermal deviation factor of the reheater will increase with the increase in SW value. Under the same secondary air distribution mode SW will increase with a reduction in boiler load. The maximum thermal deviation factor of the reheater will increase with an increase in SW value.更多还原