The invention relates to a mixed energy utilization device for an integrated rotary radiant boiler preheating boiler. The device comprises a gasification furnace body and a heat
recovery device, wherein the gasification furnace body is arranged above the heat
recovery device; the heat
recovery device comprises a synthetic gas inlet, a
radiation heat exchange component, a
slag bath, a
convection heat exchange component and a pressure shell; the synthetic gas inlet is positioned on a seal head on the top of the pressure shell; the
radiation heat exchange component is positioned on the upper part of the
slag bath; the
slag bath is positioned on the upper part of
convection heat exchange component; the
radiation heat exchange component, the slag bath and the
convection heat exchange component are positioned in the pressure shell into a whole; a lower slag port of the gasification furnace body is connected with the top of the heat recovery device through a
flange; and the lower slag port is communicated with the synthetic gas inlet. The
sensible heat of the gasified coarse synthetic gas can be effectively absorbed, and the generated high-pressure steam or medium-pressure steam is used for power generation or preheating other working media, so that the energy
utilization rate is greatly improved, and the
energy recycling efficiency is high; and moreover, the overall size of a
waste heat boiler is effectively reduced, the device is convenient to manufacture, transport and
mount, and the dust accumulation problem in the
convection heat exchange area can be eliminated.