冬天：寒冷、空气密度增加、风比较大，气流平稳。
Winter - Cold, dense air, strong winds at times with stable air.
流化催化裂化装置再生器主风分布管的设计直接影响再生器的平稳操作。
The design of main air distributor in regenerator of FCCU is directly related to the smooth operation of regenerator.
而在有外风筒情况下，气体从轴向进入且流动平稳，两种情况流动差别较大。
Under the circumstances with external duct, gas axially goes into and flows steady, the flow difference under the two circumstances is greater.
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