A system for controlling flame instability. The system may include a nozzle coupled to a fuel supply line, an insulation housing coupled to the nozzle, a combustor coupled to the nozzle via the insulation housing, where the combustor is grounded, a pressure sensor coupled to the combustor and configured to detect pressure in the combustor, and an instability controlling assembly coupled to the pressure sensor and to an alternating current power supply. The instability controlling assembly can control flame instability of a flame in the system based on pressure detected by the pressure sensor by applying a voltage from the alternating current power supply to the system to create an electric field.

A system for controlling flame instability. The system may include a nozzle coupled to a fuel supply line, an insulation housing coupled to the nozzle, a combustor coupled to the nozzle via the insulation housing, where the combustor is grounded, a pressure sensor coupled to the combustor and configured to detect pressure in the combustor, and an instability controlling assembly coupled to the pressure sensor and to an alternating current power supply. The instability controlling assembly can control flame instability of a flame in the system based on pressure detected by the pressure sensor by applying a voltage from the alternating current power supply to the system to create an electric field.

A submerged combustion melter is arranged with a melting chamber, which may be cylindrical, and at least five submerged combustion burners.

A submerged combustion melter is arranged with a melting chamber, which may be cylindrical, and at least five submerged combustion burners.

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 burner supporting primary and secondary combustion reactions may include a primary combustion reaction actuator configured to select a location of the secondary combustion reaction. A burner may include a lifted flame holder structure configured to support a secondary combustion reaction above a partial premixing region. The secondary flame support location may be selected as a function of a turndown parameter. Selection logic may be of arbitrary complexity.

A burner supporting primary and secondary combustion reactions may include a primary combustion reaction actuator configured to select a location of the secondary combustion reaction. A burner may include a lifted flame holder structure configured to support a secondary combustion reaction above a partial premixing region. The secondary flame support location may be selected as a function of a turndown parameter. Selection logic may be of arbitrary complexity.

A burner 100 comprising a burner body 110 having a burner chamber with a backing plate 122 and having a burner element received in the burner chamber, the burner element having a plurality of gas nozzles 117 for supplying gas into the burner, the gas nozzles 117 each ending in a tip through which the gas exits and gas nozzle 117, and each gas nozzle being rotatable such that the direction of gas exiting the gas nozzle can be adjusted. The burner has means for rotating the gas nozzles 117 provided on the backing plate and by releasable means for retaining each gas nozzle 117 in a plurality of rotational configurations provided outside the burner chamber. The gas nozzles 117 further comprise first and second parts which are detachable from each other, the first part comprising the tip and the second part being upstream of the first part with respect to the flow of gas into the gas nozzles in use. The burner allows for tuning of gas flow from outside the burner while it is in use.

A burner 100 comprising a burner body 110 having a burner chamber with a backing plate 122 and having a burner element received in the burner chamber, the burner element having a plurality of gas nozzles 117 for supplying gas into the burner, the gas nozzles 117 each ending in a tip through which the gas exits and gas nozzle 117, and each gas nozzle being rotatable such that the direction of gas exiting the gas nozzle can be adjusted. The burner has means for rotating the gas nozzles 117 provided on the backing plate and by releasable means for retaining each gas nozzle 117 in a plurality of rotational configurations provided outside the burner chamber. The gas nozzles 117 further comprise first and second parts which are detachable from each other, the first part comprising the tip and the second part being upstream of the first part with respect to the flow of gas into the gas nozzles in use. The burner allows for tuning of gas flow from outside the burner while it is in use.

An object of the present invention is to provide a combustion device which does not cause an increase in the amount of generated NOx or a degradation in efficiency due to a lower flame luminance, even when the combustion space is limited in the lengthwise direction of the flame. A fuel ejector is configured so as to be provided with at least a first fuel ejector and a second fuel ejector lined up in a specific direction as viewed in the lengthwise direction of fuel ejection, and is configured so that a first ejection stream ejected from the first fuel ejector and the second fuel ejector collide on the downstream side of ejection.