The boiler leaves factory separated two big pieces. The big piece upside includes the main body of boiler and the upper furnace wall, the big piece underside includes coal scuttle\chain grate\structural steel and lower furnace wall; The water walls using tubesφ63.5×4 on both of the furnace sides \right and left lower manifolds and furnace arch are bricked on the spot, the left parts are all assembled when leaving factory, the cast iron economizer and the air pre-heater are with the boiler .