Gas-solid reducing vertical furnace and sponge iron production method

The invention provides a gas-solid reducing vertical furnace and a sponge iron production method. Two vertical furnaces are adopted in the gas-solid reducing vertical furnace, and furnace roof gas, high-temperature reducing gas, intermediate gas and cooling gas of the two vertical furnaces are connected. The sponge iron production method comprises the steps that after iron containing pellets or block ore and an externally-matched reducing agent are mixed, the mixture is continuously added into the two vertical furnaces, the high-temperature reducing gas enters the vertical furnaces under switching of a reversing valve set, parallel flow heating and adverse flow heat storage are conducted in the first vertical furnace and the second vertical furnace at the same time in the airflow direction, the destructive distillation and reducing reaction is generated, and sponge iron, semi-coke and furnace roof gas are generated; and after the furnace roof gas is purified, the furnace roof gas serves as heating furnace fue