Self-preheating steel ladle cover

A self-preheating type steel ladle cover comprises a semi-closed space formed by a cover plate provided with a burner mounting hole and a side plate, the semi-closed space is filled with a heat insulation material, the cover plate is provided with an inner ring channel and an outer ring channel which are closed respectively, and an air outlet and an air inlet are formed in the inner ring channel and the outer ring channel respectively. The double-ring gas channel is arranged to be communicated to form a continuous gas channel, the heat exchange area is increased to the maximum extent, gas enters from the gas inlet of the channel and exchanges heat with the cover plate in the channel, on one hand, the gas or air is preheated, and on the other hand, the heat exchange efficiency is improved.The heated gas flows out of the gas outlet and enters the burner to participate in combustion, so that the heating efficiency is improved; and on the other hand, the cover plate is cooled, the thickness of the thermal insulat