... of no scoot blowing,which can keep the boilers running high efficiently, with full loadand safely3) ... of incompletely burning6) Adopt big grate, leak no coal, ventilate equally, clear airway itself,burn steadily7) All ... way design, adopt reasonable injected circulationfor hot water boilers, medium speed in back way of heat surface ... power-off protection, fits load waving Coal Fired Steam Boiler