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答:在讨论到锅炉烟道中烟气的负压时,一般认为由于引风机的抽吸作用,离引风机愈近的烟道中烟气的压力愈低,负压愈大。这种说法在概念上是模糊的,容易导致错误的结论。因为: 1)烟道中烟气的压力(即静压)变化,决定于流动阻力△P_(ld)重位压差Hr和动压头(W~2/2g)r三个因素的变化。只有在水平烟道中(这时没有高度H的变化,也就没有重位压差Hr的变化)而且烟道截面没有太大变化时(这时烟气的动压头(W~2/2g)r变化不大),烟气的压力才只
A: When discussing the negative pressure of the flue gas in the boiler flue, it is generally considered that the lower the pressure of the flue gas in the flue which is closer to the draft fan, the greater the negative pressure due to the suction effect of the induced draft fan. This argument is conceptually vague and easily leads to wrong conclusions. Because: 1) flue gas pressure (ie, static pressure) changes, determined by the flow resistance △ P_ (ld) reset pressure difference Hr and dynamic head (W ~ 2 / 2g) r three factors change. Only in the horizontal flue (when there is no change in the height H, there is no change in the repositioning pressure difference Hr) and there is not much change in the flue section (when the dynamic head of the flue gas (W ~ 2 / 2g) r little change), the pressure of flue gas only