Disclosed is a mixed combustion system fueled with ammonia, hydrogen and natural gas, which comprises a furnace chamber, a combustor, a heat exchanger, a mixer and a storage tank, the combustor and a conical combustion cavity are installed in the furnace chamber, the storage tank is provided with a first branch pipeline through a conveying pipe to be connected with the heat exchanger, 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 flue gas recirculating pipe connected with a furnace chamber flue gas exhaust pipeline, and the other end of the flue gas recirculating pipe is connected with an auxiliary fuel inlet of the combustor.

A premixing device includes: a blade, arranged midway of a gas flow path through which air flows, and provided with a fuel gas outlet in a region near one end downstream in an air flow direction; a pair of divided flow paths, configured by dividing a portion of the gas flow path by the blade; and a baffle, located upstream of the fuel gas outlet in the air flow direction on an inner peripheral surface of each divided flow path, and being in the shape of a protruding piece or step part protruding inward of each divided flow path. The baffle is provided in at least a portion of an inner region of each divided flow path, and makes it possible to increase a flow velocity of air flowing through an outer region to be higher than a flow velocity of air passing through the inner region.

A system to be installed into a radiant tube for reduction of pollutants, the system having a body having a tube shape including a length L.sub.B, an outer diameter OD.sub.B, and an inner diameter ID.sub.B, wherein the body further comprises a proximal surface, a terminal surface, and a circumferential surface extending between the proximal surface and terminal surface, and at least two helical bodies each having a substantially helical shape including a length L.sub.H, and an outer diameter OD.sub.H, wherein an axial distance (E) between the at least two helical bodies is at least 1% of the length L.sub.H.

Various embodiments of the teachings herein include a mixer disposed in a fuel gas combustion system and mixing air and fuel gas to form flammable mixed gases. The mixer may include: a Venturi tube having an air inlet, a fuel gas inlet, a gas mixture outlet, a central axis direction, and a throat positioned between the air inlet and the gas mixture outlet in the central axis direction, wherein the fuel gas inlet is disposed at the throat; and an adjustment component disposed in the Venturi tube downstream of the throat, the adjustment component drivable to move towards or away from the throat in the central axis direction, thereby changing a flow area of gas in the Venturi tube. The adjustment component comprises a conical valve plug with a conical outer surface thereof at a side facing towards the throat and fitting an inner surface of the Venturi tube.

An apparatus and process for oxidant formation can be configured to facilitate improved mixing of for formation of an oxidant. Embodiments can be configured so conduits having a relatively large aspect ratio (e.g., 1.5 to 5 or 1.5 to over 5) can be utilized for improved gas mixing even in situations in which the carrier gas is at a relatively low pressure. Embodiments can also facilitate low nitrogen oxide formation combustion. Some embodiments can additionally provide improved carbon capture.

There is provided a system comprising burning facility (101); a synthetic fuel production facility (102); a hydrogen production facility; and an oxygen production facility (114); wherein the oxygen production facility (114) is configured to feed the produced oxygen to the burning facility (101) for combustion of fuel at the burning facility (101) using the produced oxygen, and the burning facility (101) is configured to produce a CO.sub.2-rich flue gas based on the combustion of the fuel at the burning facility (101) using the produced oxygen, and the burning facility (101) is configured to feed the produced CO.sub.2-rich flue gas to the synthetic fuel production facility (102) for capturing the CO.sub.2 generated at the combustion in a fuel synthesis.

A gas mixer includes a housing and a gas intake pipe. The housing has a main body, a first gas intake passage, a second gas intake passage, and a gas outlet passage. The first gas intake passage, the second gas intake passage, and the gas outlet passage are connected to the main body. A central axis of the first gas intake passage and a central axis of the second gas intake passage extend and intersect with each other. The gas intake pipe is movably coupled to the first gas intake passage of the housing, so that a front end of the gas intake pipe is configured to extend to over the second gas intake passage through the first gas intake passage.

Disclosed is a mixed combustion system fueled with ammonia, hydrogen and natural gas, which comprises a furnace chamber, a combustor, a heat exchanger, a mixer and a storage tank, the combustor and a conical combustion cavity are installed in the furnace chamber, the storage tank is provided with a first branch pipeline through a conveying pipe to be connected with the heat exchanger, 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 flue gas recirculating pipe connected with a furnace chamber flue gas exhaust pipeline, and the other end of the flue gas recirculating pipe is connected with an auxiliary fuel inlet of the combustor.