炉内旋流数对热偏差影响的理论和试验研究

介绍了炉内旋流数Sw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．

Theoretical and Experimental Study of the Impact of In-boiler Swirl Number on the Thermal Deviation in a Reheater

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.