Abstract:
A method for reducing harmful gas emissions from a gas- fired boiler (1) comprising a sealed forced-draught combustion chamber (2) in which there is a burner (3) to which there leads a first conduit (5) for drawing in combustion air (A) and from which there departs a second conduit (6) for the discharge of combustion flue gases (F). Provision is made for drawing off a portion of the flue gases or exhaust gases from the second conduit (6) and injecting it into the combustion air (A) so as to reduce the percentage of atmospheric oxygen present in that combustion air (A) and consequently reduce the production of harmful gases in the combustion flue gases (F). A boiler operating according to the aforesaid method is also claimed.
Abstract:
A burner for industrial furnace, which can be installed in a furnace (2) comprising at least one firing chamber (3), the burner comprises a main tubular body (6) provided with at least one first port (7) for the inlet of a fuel, with at least one second port (8) for the inlet of combustive agent, and with an end nozzle (15) provided with an outlet mouth (16) facing towards the firing chamber (3), and elements (12) for triggering combustion of the fuel - combustive agent mixture. The burner also comprises at least one duct (17) adapted to pick up a portion of the gases present within the firing chamber (3) and to convey them at the outlet mouth (16) of the end nozzle (15).
Abstract:
A furnace system (10) including a combustion vessel (12) having an outlet end (19) and at least one aperture (20, 22) extending into an interior area (14) defined by the combustion vessel. The furnace system (10) includes a flue duct (42) coupled to the outlet end (19) and in fluid communication with the interior area. A recirculation duct (55) extends from the flue duct (42) to one or more of the apertures (20, 22) and provides fluid communication between the flue duct (42) and the interior area (14).
Abstract:
A low NOx burner for installation on a furnace wall. The burner has an elongated tube connected to a combustion air supply, the furnace side end of which mounts a combustion air spinner that is spaced a substantial distance from the furnace wall. A plurality of typically six elongated air ports extend through the wall from the windbox of the furnace into the combustion chamber and supply most of the required combustion air. Downstream ends of the air ports are spaced from the furnace wall as well as from the spinner, and they are configured to bias the discharged air flow towards the spinner. A plurality of first fuel gas spuds with fuel gas discharge orifices is arranged about the spinner and discharges fuel gas into the combustion chamber downstream of the spinner.
Abstract:
Die Erfindung betrifft eine Brennkammer (6, 48, 72) für eine Gasturbine (2, 50, 70) mit mindestens einem ersten und einem zweiten Strahlträger (14, 16, 52), von denen zumindest einer zum Eindüsen eines Betriebgases derart in einen Brennraum (12) vorgesehen ist, dass in seiner Flammzone (34, 38, 68) gebildetes Abgas im Brennraum (12) in eine Mischzone (28) des ersten Strahlträgers (14) rezirkuliert. Um eine kompakte Brennkammer zu erreichen wird vorgeschlagen, dass die Strahlträger (14, 16, 52) so zueinander positioniert sind, dass Abgas aus einer Flammzone (34) des ersten Strahlträgers (14) unmittelbar in eine Mischzone (30, 66) des zweiten Strahlträgers (16, 52) einströmt.
Abstract:
In a system for thermally processing materials, at least one slot eductor is disposed in a wall or roof surface of the furnace chamber to provide circulation of gas within the furnace chamber.
Abstract:
A burner assembly (20) for a furnace or like device having a firebox defining a combustion zone (24). The burner assembly (20) includes a first annular tile (36) defining a centrally located path for a flow of combustion air and a second annular tile (38) concentric with the first annular tile. The second annular tile (38) has an internal diameter which is larger than an external diameter of said first annular tile (36), and the second annular tile (38) is positioned in surrounding relationship relative to at least a portion of said first annular tile (36) so that a ring-shaped conduit (80) is defined therebetween. The arrangement is such that combustion air flowing along said path induces a flow of flue gas through the conduit for entrainment by the flow of combustion air.
Abstract:
A boiler (11) has a conventional oil burner (12). Flue gas is recirculated from the stack to the burner and mixed with atmospheric air to form the combustion air. Subpressure is provided in the fan (22, 31) of the burner and the flue gas is drawn into the fan and mixed with the air in the fan. The flue gas is cooled in a cooler (16) before being mixed with the air. The emission of nitrogen oxides will be extremely low.
Abstract:
Procédé de réduction de l'émission d'oxydes d'azote NOx lors de la combustion d'un combustible gazeux dans un brûleur (10') destiné à un four de réchauffage à feu nu ou sous atmosphère, pour le réchauffage de produits sidérurgiques ou pour le revêtement et/ou recuit en continu de bandes métalliques, notamment sidérurgiques, procédé selon lequel une première dilution est réalisée par mélange de l'air de combustion (7) avec des produits de combustion (9) en amont du brûleur ou dans le corps du brûleur; une deuxième dilution est réalisée directement au niveau (A) où se produit la réaction du combustible gazeux avec l'air de combustion, en opérant un mélange du combustible avec une partie recirculée de la flamme ou les produits de la combustion partielle, cette double dilution permettant la modification des caractéristiques physiques et chimiques du gaz pour le fonctionnement du brûleur avec des taux d'oxygène faibles afin d'obtenir une flamme produisant un très bas niveau de production de NOx quelle que soit la température de l'enceinte dans laquelle se développe la combustion.