The series boiler is typical double drums and package water-tube boiler with D arrangement It consists of steam and water drum,memberane wall,superheater,convective bank and economizer.Lay out the burner at the front wall.When fuel has been bumed inside of the furmace,the smoke goes through the superheater and economizer.And last goes to the chimney.The product is less occupying area with compact structure has good tightness and reduce the amount of fire bricks and maintenance load.The external packing uses colour steel plate with beautiful appearance.Fully-automatic combustor is used with high burning efficiency and ignition control program.It also has over pressure and flameout protective functions takes package structure to shorten installation period.