Method for carrying out combustion in an industrial furnace

A method for combustion in an industrial furnace having fuel and a first oxidizer to heat a material includes arranging at least one lance in a sidewall of the furnace; supplying a second oxidizer with an oxygen content of at least 85 percent by weight in the form of a jet traveling at at least sonic velocity to the interior of the furnace through the at least one lance; running the jet of the second oxidizer in the horizontal plane above the material between and essentially in parallel with two consecutive rows of the roof burners; balancing an amount of the second oxidizer supplied per time unit so that the oxygen content supplied via the second oxidizer constitutes at least 50 percent by weight of the total supplied oxygen per time unit in the furnace.

METHOD FOR BURNER AND BURNER DEVICE

Burner device () for an industrial furnace () comprising a channel () for fuel, a channel () for a first oxidant, an outlet () for flue gases, a control device () and a heat buffer (), where the first oxidant and the flue gases alternating are led through the heat buffer (). The invention is characterized in that a separate lancing device () is arranged to supply a second oxidant to the burner device (). 1344339107. A method for increasing efficiency when heating an industrial furnace using a burner device comprising a first channel () for fuel , a second channel () for a first oxidant , the second channel () for the first oxidant being i) separate from the first channel () for the fuel , and ii) outside of the channel () for the fuel , an outlet () for flue gases , a control device () , and a heat buffer () , the method comprising the steps of:supplying the fuel through the first channel;alternatingly leading the first oxidant and the flue gases, in a gas flow direction toward the burner device, through the heat buffer and from the heat buffer through the second channel to the burner device; andsupplying a second oxidant, comprised of at least 80 percentages by weight oxygen, via a separate lancing device to the burner device through the second channel, the second oxidant being supplied at a velocity which is at least sonic velocity, so that an ejector effect is created downstream of the heat buffer in relation to the gas flow direction towards the burner device, such that a flow of preheated oxidant is increased, andwherein the lancing of the second oxidant is supplied in the first channel for the first oxidant but not in the channel for the fuel.2. The method of claim 1 , wherein claim 1 , the control device controls an amount of the lanced secondary oxidant over time claim 1 , so that different amounts of the lanced secondary oxidant are respectively provided during corresponding different heating stages of the furnace.3. The method according to claim 1 , ...

Combustion process and burner

A method and apparatus relating to the combustion of a fuel with an oxidant in a heating furnace, wherein the fuel and the oxidant are delivered to a burner head. In a first method step fuel and oxidant are emitted from the burner head in close proximity to each other, so that combustion essentially takes place close to and at a small distance outward of the burner head, and until a temperature is reached in the furnace space that exceeds the spontaneous combustion temperature of the fuel. In a second method step the fuel and the oxidant are instead emitted from the burner head at a mutual distance apart, so that combustion takes place at a distance from the burner head corresponding to at least the diameter of the burner head and outward of the burner head.

Method and device for combustion of solid fuel

Method for burner and burner device

Burner device (2) for an industrial furnace (1) comprising a channel (3) for fuel, a channel (4) for a first oxidant, an outlet (9) for flue gases, a control device (10) and a heat buffer (7), where the first oxidant and the flue gases alternatingly are led through the heat buffer (7). The invention is characterised in that a separate lancing device (6) is arranged to supply a second oxidant to the burner device (2).

Method for carrying out combustion in an industrial furnace

A method for combustion in an industrial furnace having fuel and a first oxidizer to heat a material includes arranging at least one lance in a sidewall of the furnace; supplying a second oxidizer with an oxygen content of at least 85 percent by weight in the form of a jet traveling at at least sonic velocity to the interior of the furnace through the at least one lance; running the jet of the second oxidizer in the horizontal plane above the material between and essentially in parallel with two consecutive rows of the roof burners; balancing an amount of the second oxidizer supplied per time unit so that the oxygen content supplied via the second oxidizer constitutes at least 50 percent by weight of the total supplied oxygen per time unit in the furnace.

Method and apparatus for heat treatment

A method and an apparatus for heat-treatment of materials, preferably metals, are provided. The method comprises the following steps: providing and maintaining a flame by supplying a burner with fuel and gas containing at least 80 percent by volume oxygen; creating an oxygen-hot exhaust mixture by recirculating exhausts from the flame to the gas containing oxygen by means of an ejector effect; mixing the oxygen-exhaust mixture and the fuel; and providing a secondary recirculation by recirculating exhausts from the flame to the oxygen-exhaust-fuel mixture. The method and apparatus allow for extremely low NOx emissions and high efficiency, resulting in an environmentally friendly and at the same time cost effective process.

Method for burner and burner device

Burner device ( 2 ) for an industrial furnace ( 1 ) comprising a channel ( 3 ) for fuel, a channel ( 4 ) for a first oxidant, an outlet ( 9 ) for flue gases, a control device ( 10 ) and a heat buffer ( 7 ), where the first oxidant and the flue gases alternatingly are led through the heat buffer ( 7 ). The invention is characterised in that a separate lancing device ( 6 ) is arranged to supply a second oxidant to the burner device ( 2 ).

Method and device for combustion of solid fuel

Method and device for combusting a solid phase fuel, where the fuel is caused, by the help of a non-pneumatic feeding element ( 11 ), to be fed to an inlet opening ( 11 a ) in a burner device ( 10 ), where the burner device ( 10 ) includes a first inlet ( 13 a ) for the oxidant through which an oxidant is caused to flow via a first supply conduit ( 13 ). The first inlet ( 13 a ) for oxidant is arranged in the form of a first opening arranged by the inlet opening, through which the oxidant is caused to flow out, through a burner pipe ( 16 ) and out through a burner orifice ( 17 ) to a combustion space ( 18 ), so that the oxidant by ejector action causes the fuel to be conveyed through the burner pipe and out through the burner orifice ( 17 ), and water vapour is added to the oxidant before the oxidant reacts with the fuel.

Method to homogenize the heat distribution

MÉTODO PARA HOMOGENEIZAR A DISTRIBUIÇÃO DE CALOR. Método para homogeneizar a distribuição de calor assim como diminuir a quantidade de NOx nos produtos de combustão quando um forno industrial (1) com pelo menos um queimador convencional (2a, 2b, 2c, 2d) usando ar como oxidante. Um oxidante adicional compreendendo pelo menos 50% de gás oxigênio é obrigado a passar no forno (1) através de uma lança (3a, 3b, 3c, 3d) . A quantidade total de oxigênio subministrado é balançada contra a quantidade de combustível sendo subministrado através do queimador a ar (2a, 2b, 2c, 2d) . A invenção é caracterizada primeiramente pelo fato de na combinação disso, pelo menos 40% do oxigênio subministrado ser fornecido através do oxidante adicional, sendo que a lança (3a, 3b, 3c, 3d) é arranjada a uma distância do forno a ar (2a, 2b, 2c, 2d) de pelo menos 0,3 metros, e sendo que o oxidante adicional passa no forno (1) através da lança (3a, 3b, 3c, 3d) com pelo menos a velocidade do som e, em segundo lugar, sendo que o oxidante adicional é subministrado somente quando o queimador a ar (2a, 2b, 2c, 2d) é operado a uma certa potência mais baixa ou a uma potência mais alta. METHOD TO HOMOGENEIZE HEAT DISTRIBUTION. Method for homogenizing the heat distribution as well as decreasing the amount of NOx in the combustion products when an industrial furnace (1) with at least one conventional burner (2a, 2b, 2c, 2d) uses air as oxidant. An additional oxidant comprising at least 50% oxygen gas is passed into the oven (1) through a lance (3a, 3b, 3c, 3d). The total amount of oxygen supplied is balanced against the amount of fuel being supplied through the air burner (2a, 2b, 2c, 2d). The invention is characterized primarily by the fact that in the combination thereof, at least 40% of the supplied oxygen is supplied through the additional oxidant, whereby the lance (3a, 3b, 3c, 3d) is arranged at a distance from the air oven (2a , 2b, 2c, 2d) of at least 0.3 meters, and with the additional oxidant ...

Method for homogenizing the heat distribution as well as decreasing the amount of nox

Method for homogenizing the heat distribution as well as decreasing the amount of NO x in the combustion products when operating an industrial furnace (1) with at least one conventional burner (2a, 2b, 2c, 2d) using air as oxidant. An additional oxidant comprising at least 50% oxygen gas is caused to stream into the furnace (1) through a lance (3a, 3b, 3c, 3d). The total amount of oxygen supplied is balanced against the amount of fuel being supplied through the air burner (2a, 2b, 2c, 2d). The invention is characterised in firstly, the combination of that at least 40% of the supplied oxygen is supplied through the additional oxidant, that the lance (3a, 3b, 3c, 3d) is arranged at a distance from the air burner (2a, 2b, 2c, 2d) of at least 0.3 meters, and that the additional oxidant streams into the furnace (1) through the lance (3a, 3b, 3c, 3d) with at least sonic velocity, and secondly that the additional oxidant is supplied only when the air burner (2a, 2b, 2c, 2d) is operated at a certain lowest power or at a higher power.

Method for combustion of a low-grade fuel

Method for combustion of a fuel uses an existing air burner ( 1 ), including a first supply opening ( 5 ) for fuel and a second supply opening ( 7 ) for air, which supply openings ( 5, 7 ) open out into a combustion zone ( 3 ). The method is characterised in that a gaseous fuel with an LHV (Lower Heating Value) of less than 7.5 MJ/Nm 3 is supplied through the second supply opening ( 7 ), in that an oxidant including at least 85 percent by weight oxygen is also supplied to the combustion zone ( 3 ) through a supply device for oxidant, and in that the gaseous fuel is caused to be combusted with the oxidant in the combustion zone ( 3 ).

Method for combustion of a low-grade fuel

Abstract Method for combustion of a fuel using an existing air burner (1), which air burner (1) comprises a first supply opening 5 (5) for fuel and a second supply opening (7) for air, which supply openings (5,7) open out into a combustion zone (3). The invention is characterised in that a gaseous fuel with an LHV (Lower Heating Value) of less than 7,5 MJ/Nm3 is supplied 10 through the second supply opening (7), in that an oxidant comprising at least 85 percentages by weight oxygen is also supplied to the combustion zone (3) through a supply device for oxidant, and in that the gaseous fuel is caused to be combusted with the oxidant in the combustion zone (3). Ans6kningstext docx 2010-02-05 100026SE Fig. 1 4 _______5 Fig. 2