The secondary air duct of boilers is a group of large diameter short ducts in parallel connection, having inlet air flow condition with inner positioned resistant pieces.

• 摘要锅炉二次风道为有内置阻力件的一组并联大口径短通道，其阻力系数严重偏小而且风门涡流强烈，从而造成二次风强烈脉动。