密封风机能使空气达到设定的压力，此压力应高于烟气在烟道中的运行压力。
The seal air fans deliver a design pressure that is above the operating pressure in the flue work.
利用一个压力控制器，采用PID控制方法对调压风机进行变频控制。
A pressure controller is employed to modulate speed of regulating pressure fan in a PID control mode.
风机根据计算空气量和总压力损失的数值进行选择。
And blowers are chosen according to calculation of air volume and total pressure loss.
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