Flare system for staged combustion and staged combustion method

The invention discloses a staged combustion torch system and a staged combustion method, and belongs to the technical field of petrochemical engineering, the torch system comprises a plurality of stages of torches and a plurality of staged tanks, each staged tank is provided with a first water inlet, a gas input pipeline and a gas outlet, the gas input pipeline extends from the outer wall of the staged tank to the liquid level direction of a water seal medium, and the gas outlet is communicated with the first water inlet. When a water seal medium is input into the classification tank, the outlet of the gas input pipeline is located in the water seal medium, and the water seal medium has water seal pressure larger than the discharge pressure of the combustible gas so as to prevent the combustible gas from breaking through the water seal medium to be discharged into the corresponding torch. In the whole process, the torches of the corresponding stages can be controlled to be put according to the pressure of the