System preparing sponge iron with gas-based shaft furnace

The utility model provides a system preparing sponge iron with a gas-based shaft furnace. The system comprises a gas-based shaft furnace, a hydrogen extracting device and a heating furnace, wherein the gas-based shaft furnace is provided with a feed opening, a discharge opening and a furnace top gas outlet, and further provided with a reduction cavity chamber and a cooling cavity chamber arranged under the reduction cavity chamber; the reduction cavity chamber is provided with a reducing gas inlet; the cooling cavity chamber is provided with a cooling gas inlet; the hydrogen extracting device is provided with a gas inlet, a hydrogen outlet and a carbon monoxide gas outlet; the carbon monoxide gas outlet is communicated with the cooling gas inlet in the cooling cavity chamber; the heating furnace is arranged between the hydrogen extracting device and the gas-based shaft furnace, and is communicated with the hydrogen outlet and the reducing gas inlet of the reduction cavity chamber respectively. After adoption of the system, the energy consumption of direct reduction technology of the gas-based shaft furnace can be effectively reduced.