A furnace for implementing an endothermic process, including a combustion chamber delimited by a wall, at least one tubular reactor positioned in the combustion chamber, at least one burner arranged in the combustion chamber configured to supply the tubular reactor with the heat required for the endothermic process, with the burner including at least one nozzle for discharging a flame, the nozzle being oriented along an axis of the nozzle. Wherein the chamber has, over at least part of an inner surface of the wall, a convex inner profile curved in a direction of the axis of the nozzle, the profile being adjacent to the burner and facing the axis.

A combustor can include: a combustion chamber; a cap covering the combustion chamber; a first swirler inlet cup passing through the cap and having a first length and a first bell mouth; a second swirler inlet cup passing through the cap and having a second length and a second bell mouth; and a third swirler inlet cup passing through the cap and having a third length and a third bell mouth, wherein the first length is different from the third length, and wherein the first bell mouth is different from the third bell mouth. The first, second, and third swirler inlet cups can have different diameters, respectively.

The invention relates to a gas burner comprising: an injection holder (2) with at least three gas injectors (2.1, 2.2, 2.3); a burner crown assembly (3), the burner crown assembly comprising at least three flame rings (FR1, FR2, FR3) with different sizes, the burner crown assembly further comprising at least three chambers (CH1, CH2, CH3) and at least three pipes (3.1.1, 3.1.2, 3.1.3), each pipe being fluidly coupled with a single chamber; wherein each gas injector is associated with one of said pipes for providing gas into said pipe, said pipe being adapted to receive primary air in the area of the injection holder and to provide a combustion mixture of gas and primary air to one of said flame rings of the burner crown assembly. In addition, adjacent flame rings are separated from each other based on an air gap (AG1, AG2) provided between said adjacent flame rings.

The invention relates to a gas burner comprising: an injection holder (2) with at least three gas injectors (2.1, 2.2, 2.3); a burner crown assembly (3), the burner crown assembly comprising at least three flame rings (FR1, FR2, FR3) with different sizes, the burner crown assembly further comprising at least three chambers (CH1, CH2, CH3) and at least three pipes (3.1.1, 3.1.2, 3.1.3), each pipe being fluidly coupled with a single chamber; wherein each gas injector is associated with one of said pipes for providing gas into said pipe, said pipe being adapted to receive primary air in the area of the injection holder and to provide a combustion mixture of gas and primary air to one of said flame rings of the burner crown assembly. In addition, adjacent flame rings are separated from each other based on an air gap (AG1, AG2) provided between said adjacent flame rings.

Horizontal immersion tube boilers include a plurality of burner nozzles positioned in substantial alignment with a respective plurality of boiler tubes. Fuel-air mixture directed through the burner nozzles are ignited by a pilot flame system positioned proximate to the burner nozzles within a combustion chamber. The burner nozzles and pilot flame system receive air from a secondary air manifold having inlets that provide secondary air into the combustion chamber. The flames extending from the burner nozzles are directed into the respective boiler tubes, which exchange heat from the flame into water within a boiler shell. The secondary air inlets direct air around the burner nozzles and toward the boiler tubes, creating an air blanket around each burner nozzle for reducing turbulence and guide the flames into their respective boiler tubes. An improved flame arrestor within the nozzle prevents flame back-flow when modulating to lower firing rates.

A duel-fuel fireplace apparatus is described. In one example, an apparatus includes an enclosure having a door disposed thereon and a wood burning compartment disposed within the enclosure. The wood burning compartment has an insulated housing configured to support temperatures associated with burning of wood within the wood burning compartment. A gas burning compartment is also disposed within the enclosure and has a gas burner disposed therein. A mechanism including a motor is configured to cause movement between a first mode in which the wood burning compartment is viewable through the door and a second mode in which the gas burning compartment is viewable through the door.

A duel-fuel fireplace apparatus is described. In one example, an apparatus includes an enclosure having a door disposed thereon and a wood burning compartment disposed within the enclosure. The wood burning compartment has an insulated housing configured to support temperatures associated with burning of wood within the wood burning compartment. A gas burning compartment is also disposed within the enclosure and has a gas burner disposed therein. A mechanism including a motor is configured to cause movement between a first mode in which the wood burning compartment is viewable through the door and a second mode in which the gas burning compartment is viewable through the door.

A collar configured to couple a burner to a partition plate is provided including a body having a diameter configured to couple to a diameter of the burner. A flange extends outwardly from the body. The collar is formed from a heat resistance material such that heat transfer between the burner and the partition plate is limited.

A collar configured to couple a burner to a partition plate is provided including a body having a diameter configured to couple to a diameter of the burner. A flange extends outwardly from the body. The collar is formed from a heat resistance material such that heat transfer between the burner and the partition plate is limited.

A combustor can include: a combustion chamber; a cap covering the combustion chamber; a first swirler inlet cup passing through the cap and having a first length and a first bell mouth; a second swirler inlet cup passing through the cap and having a second length and a second bell mouth; and a third swirler inlet cup passing through the cap and having a third length and a third bell mouth, wherein the first length is different from the third length, and wherein the first bell mouth is different from the third bell mouth. The first, second, and third swirler inlet cups can have different diameters, respectively.