recirculation air

The blade angle of outer secondary air is too large or too small will cause the relative concentration of particles near the axis region and is lack of coal powder concentration in the recirculation region.

过大或过小的叶片角度使得轴线附近区域颗粒相对集中，回流区内煤粉浓度不足，不利于稳燃和抑制NOx生成。

The tests show that, the tertiary air ratio has more influence on the boiler combustion, while the preferable opening degree of mill recirculation air damper may improve the economics and safety of boiler.

试验表明三次风率的大小对锅炉燃烧的影响较大，较佳的磨煤机再循环风门开度可以提高锅炉的经济性和安全性。

Ultrafine pulverized-coal contained in the tertiary air was used as the reburning fuel and the oxygen level of the tertiary air was reduced with the use of flue gas recirculation ( FGR).

该再燃系统利用三次风中的超细煤粉作为再燃燃料，并通过烟气再循环来降低三次风中的氧浓度。

Rotate and tilt the vacuum actuator as required to disengage the hole on the end of the actuator link from the hooked pin on the end of the recirculation air door lever.

视需要旋转并将真空引动器倾斜以放松循环空气门连杆末端上的勾销放松引动器连接末端上的孔。