螺旋管输送机是在圆筒形机壳内焊有连续的螺旋叶片，机壳与螺旋叶片一起转动。
The spiral pipe conveyor is welded with a continuous spiral blade in the cylindrical shell.
锅炉的燃烧器由船形改为水平浓淡形，空气预热器由回转式改为螺旋管式。
The burners of boiler A were revamped from boat type to horizontal condense dilute type, the air preheater revamped from rotary to scrolled.
锅炉的燃烧器由船形改为水平浓淡形，空气预热器由回转式改为螺旋管式。
The burners of boiler A were revamped from boat type to horizontal condense dilute type, the air preheater revamped from rotary to scrolled.
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