环流层 meaning in English

circulation layer

The materials - air circulation is existed in the ginding chamber of hammer mill when grinding materials . it led to lower production , higher consumption of energy and particle inhomogeity . aiming at materials - air circulation , the special type grinding chamber that is made up of trapezium screen was proposed
针对锤片式粉碎机工作时粉碎室内存在物料-空气环流层,导致其粉碎效率低、能耗高,且粉碎物粒度不均匀,提出使用梯形筛片构成的异型粉碎室来改善锤片式粉碎机的性能。