Blast furnace top uniform-pressure gas recycling system and method

The invention provides a blast furnace top uniform-pressure gas recycling system and method. A uniform-pressure gas pipe is connected into the high pressure end, located on the front portion of a pressure equalizing valve, of a gas pipe. A return pressure pipeline is additionally arranged. One end of the return pressure pipeline is connected with the gas pipe. The other end of the return pressure pipeline is connected with a clean gas main pipe. The return pressure is sequentially provided with a recycling valve, a buffering tank, an adjusting valve, a check valve and a stop valve. The recycling valve is opened, and gas enters the clean gas main pipe; when the pressure of the gas and the pressure of the clean gas main pipe are in balance, the recycling valve is closed, a relief valve is opened, and feeding to a lower tank is conducted; after feeding is ended, the pressure equalizing valve is opened, the relief valve is closed, the pressure of the lower tank is equalized with the furnace top pressure, and feed