6results about "Fluegas recirculation" patented technology

A flame stabilization apparatus with fuel injection upstream of a torpedo, includes a flame stabilization plate that incorporates spokes that stabilize a flame over a range of operations of a burner. The spokes surround a fuel plenum with respect to the burner. A first group of fuel ports can be located in a fuel tube upstream of the torpedo and a second group of fuel ports can be located in the flame stabilization plate. A discharge cone includes a discharge zone for the burner, wherein the flame with respect to the flue gas is stabilized at an end of the burner in the discharge zone.

A grate arrangement and a method for use in a fluidized-bed boiler. The arrangement (100) comprises a grate (1) having length (L) and width (W) defining the area (A) of said grate, plurality of gas feeding means (2) being distributed on the area (A) of the grate, a gas supply system (3) connected to the plurality of gas feeding means (2) for supplying fluidizing gas above the grate (1), and a booster gas supply system (4) connected to at least some of the plurality of gas feeding means (2) for supplying booster gas above the grate (1). The gas feeding means (2) are grouped in at least two feeding groups (5), each of which feeding groups (5) is extending only to a subarea (S) of the area (A) of the grate. Controlling means (6, 7) are arranged for controlling the systems (3, 4) so that while at least one of the feeding groups (5) is open to the gas supply system (3) for feeding fluidizing gas above the grate (1), at least one another of the feeding groups (5) is closed to said gas supply system (3) and open to the booster gas supply system (4).

The combustion system includes a bypass (6) that opens to ambient air during two different operating modes (M1 “conventional combustion”; M2 “oxy-fuel combustion”), the bypass (6) having the function of introducing air into the recycle loop (40) when the discharge valve (V3) is at least partially open and the recycle valve (V2) is open or closed, and discharging an excess (G2) of the combustion gas (G) generated by the combustion device (1) from the recycle loop (40) and supplying another fraction (G1) of the combustion gas (G) generated by the combustion device (1) to the mixer (31) when the discharge valve (V3) is closed and the recycle valve (V2) is open.

An apparatus and process can be configured for reduced nitrogen oxide formation during combustion. Embodiments can provide synthetic air to a combustion device so that combustion of a fuel can occur with a substantially low amount of NOx. Some embodiments can provide a reduction in NOx formation by at least 75% and as much as greater than 95% as compared to use of ambient air or oxygen enriched air oxidants. Embodiments can also provide a flue gas that has a high concentration of carbon dioxide that can facilitate improved carbon capture and permit efficient formation of at least one carbon dioxide product stream with a high carbon dioxide concentration (e.g. at least 95 mole percent carbon dioxide).

The present invention relates to a burner for fuel, preferably gaseous fuel. In particular, the device of the invention provides a burner for fuel which allows the combustion of hydrogen or mixtures of gases, for example hydrogen and ammonia, with a high flame stability.

The invention relates to a heating device (1) with at least one reaction unit (2) for generating heat from a reaction gas mixture which comprises hydrogen, gaseous hydrocarbon and / or oxygen, wherein the reaction unit (2) has at least one hydrogen catalytic converter (6) for flameless combustion of the hydrogen-comprising reaction gas mixture, and wherein the reaction unit (2) has at least one inlet (23) for the reaction gas mixture and / or the oxygen, and at least one outlet (24) for a heated exhaust gas mixture. According to the invention, the heating device (1) comprises at least one connecting portion (25) which fluidically connects the at least one inlet (23) and the at least one outlet (24) to one another, with the result that the heated exhaust gas mixture can be fed at least partially to the at least one inlet (23). The invention also relates to a method for operating a heating device (1).