Mixed combustion system fueled with ammonia, hydrogen and natural gas

A mixed combustion system fueled with ammonia, hydrogen and natural gas, comprising a furnace chamber, a combustor, a conical combustion cavity, a heat exchanger, a mixer and a storage tank, wherein the combustor is installed on a front end side wall of the furnace chamber, the conical combustion cavity is installed in the furnace chamber, and the heat exchanger is installed in the furnace chamber and located between the combustor and a flue gas exhaust outlet;

• the storage tank is provided with a pressure reducing valve at an outlet, and provided with a first branch pipeline through a conveying pipe to be connected with the heat exchanger, an outlet of the heat exchanger is connected with an inlet of the mixer, and an outlet of the mixer is connected with a fuel inlet of the combustor;
• and the conveying pipe is provided with a second branch pipeline connected with an ejector port of a first ejector, the first ejector is installed on a first end of a flue gas recirculating pipe connected with the flue gas exhaust outlet, and an opposite end of the flue gas recirculating pipe is connected with an auxiliary fuel inlet of the combustor.