Steam-type preheating device for corrugated board

The invention discloses a steam-type preheating device for a corrugated board. A cavity body (2) is horizontally installed on a support seat (1) through a transversal location surface (3) and a longitudinal location surface (4); a container is divided into a group of chambers by a group of partitions (5) separately, and the head and the tail of each chamber are communicated; a steam inlet (7) anda condensed water outlet (8) communicate with a chamber in the cavity body (2) separately; a group of blow-off valves (9) is arranged on the end surface of the other side of the cavity body (2); and the group of blow-off valves (9) communicates with the group of chambers separately. An improved heater adopts the principle of a coil heat exchanger, fins are arranged on an upper plate of the heater,and the charged saturated steam flows along each chamber in the cavity, and carries out adequate heat exchange with a heat plate. Because the fins are added to the surface of the upper plate, the absorption area of the upper plate is increased by 20%, so that more heat absorbed by the upper plate is ensured; and meanwhile, due to the structure, the utilization rate for steam is increased, and theheat energy of the heater is increased, so that keeping for the stable temperature of the heater when the heater carries out heat exchange with a paperboard again is benefited.