Abstract: A method for heating a blast furnace stove includes combusting a fuel with a lower heating value (LHV) of 9 MJ/Nm3 or less in a combustion zone which is arranged in a combustion chamber in the stove, and causing the combustion gases to flow through and thereby heat refractory material in the stove. The fuel is combusted with an oxidant including at least 85% oxygen, and combustion gases are recirculated into the combustion zone for diluting the mixture of fuel and oxidant therein sufficiently for the combustion to be flameless.

Abstract: A method for heating a blast furnace stove includes combining flue gas recycling and oxy-fuel combustion for concentrating CO2 for facilitating carbon capture and reducing CO2 emissions from a plant operatively associated with the stove. Top gas from a blast furnace associated with the stove may be the fuel for the stove.

Abstract: A method and apparatus for heating a sheet-like material to a predetermined temperature profile along the length and across the width of the material. The sheet-like material is transported within a furnace relative to at least one burner holder above or below, or above and below, the material. Each burner holder includes a number of direct flame impingement burners located side-by-side in a row. The burners are directed toward the sheet-like material, and the individual burners in each burner holder are oriented and controlled so that heat output from the burners provides the predetermined temperature profile within the sheet-like material.

Abstract: A method for heating a blast furnace stove having a combustion chamber with a combustion zone therein, includes causing combustion gases to flow through and be exhausted from refractory material in the stove for heating said material, supplying and adding an oxidant comprising an oxygen content of at least 85% into the combustion chamber for recirculating the combustion gases including said oxidant into the combustion zone, wherein the recirculating the combustion gases is from a location inside the combustion chamber, but outside an area of the combustion chamber occupied by the combustion zone, and the supplying the oxidant to the combustion zone is at high velocity through at least one lance, thereby entraining the combustion gases into the combustion zone, diluting a mixture of the fuel and the oxidant with the recirculated combustion gases, and flamelessly combusting said mixture in the combination zone.

Abstract: A method for heating a blast furnace stove includes combusting a fuel with a lower heating value (LHV) of 9 MJ/Nm3 or less in a combustion zone which is arranged in a combustion chamber in the stove, and causing the combustion gases to flow through and thereby heat refractory material in the stove. The fuel is combusted with an oxidant including at least 85% oxygen, and combustion gases are recirculated into the combustion zone for diluting the mixture of fuel and oxidant therein sufficiently for the combustion to be flameless.

Abstract: Method for homogenizing the heat distribution as well as decreasing the amount of NOx in combustion products when operating an industrial furnace with at least one conventional burner using air as an oxidant. An additional oxidant including at least 50% oxygen gas is caused to stream into the furnace through a lance. The total amount of oxygen supplied is balanced against the amount of fuel being supplied through the air burner. Firstly, the combination of at least 40% of the supplied oxygen is supplied through the additional oxidant, the lance is arranged at a distance from the air burner of at least 0.3 meters, and the additional oxidant streams into the furnace through the lance with at least sonic velocity, and secondly the additional oxidant is supplied only when the air burner is operated at a certain lowest power or at a higher power.

Abstract: Method for use when galvannealing a steel material (1), in which the material (1), in a first step, is preheated to a first process temperature and is coated with a layer of a liquid alloying metal (3), in a second step is further heated to a second, higher process temperature, and in a third step is kept at the second process temperature during a predetermined time period so that the alloying metal coating at least partially is caused to alloy with the steel material (1). The heating in the second step is caused to be carried out by one or several DFI burners (5).

Abstract: Method for homogenizing the heat distribution as well as decreasing the amount of NOx in combustion products when operating an industrial furnace with at least one conventional burner using air as an oxidant. An additional oxidant including at least 50% oxygen gas is caused to stream into the furnace through a lance. The total amount of oxygen supplied is balanced against the amount of fuel being supplied through the air burner. Firstly, the combination of at least 40% of the supplied oxygen is supplied through the additional oxidant, the lance is arranged at a distance from the air burner of at least 0.3 meters, and the additional oxidant streams into the furnace through the lance with at least sonic velocity, and secondly the additional oxidant is supplied only when the air burner is operated at a certain lowest power or at a higher power.

Abstract: A method for igniting a fuel/oxidant mixture in an industrial furnace. At least one fuel supply conduit and at least one oxidant supply conduit is provided, each conduit having an opening that opens on a side of the burner head that faces the furnace interior space. Fuel and oxidant are supplied to the burner head, and a light detector for detecting ultraviolet light, or other light wavelengths, is provided for detecting light that indicates the presence of a flame. A laser is positioned to emit a laser beam onto a point on the burner head adjacent the conduit outlets and to heat that point to a temperature exceeding the ignition temperature of the fuel/oxidant mixture. When the burner has ignited, the detector emits a signal to a control circuit that extinguishes the laser beam.

Abstract: A method for the heat treatment of extended steel products such as, for example, rods, pipes, work pieces, etc., while the products are in motion. The products (13, 14, 33, 34, 35) are caused to be heated by DFI burners (6-11, 16-20) (where “DFI” is an abbreviation for “direct flame impingement”), which burners are caused to be located such that one set of burners (6, 7, 8, 9, 10, 11), (16, 17, 18, 19, 20) essentially covers the circumference of the products, and in the burners are caused to be located integrated into arrangements (2-4, 13) that transport the product in a direction that is perpendicular to a plane in which the flames of the burners essentially lie.

Abstract: A method and apparatus for heating extended steel products, such as pipes, tape, or wire products or rods following working such as rolling or extrusion, to a heat treatment temperature, normally to approximately 50 to 900 degrees Celsius. The heating takes place as a result of the product being fed through a burner that has a central through channel into which the product is fed. Fuel and oxidant are supplied through channels that are outside of the central channel and are supplied at such a rate that the combustion of the fuel takes place in front of an outlet opening of the burner head of the burner.

Abstract: Each one of the side edges (4a, 4b) of a door (3) is arranged to run inside and along a respective tube (5a, 5b) that has a longitudinal slit (6a, 6b) and extends vertically, in that each tube is fixed in relation to the furnace, in that the tubes (5a, 5b) are designed to spring back towards a respective position in which the slit (6a, 6b) is closed, and arranged to enclose the side edge (4a, 4b) of the door (3) along essentially the whole length of the side edge (4a, 4b) when the door (3) is in its closed position, and in that a liquid coolant is arranged to stream through the tubes (5a, 5b) and essentially fill up the whole space defined by the combination of the inner surfaces of each tube (5a, 5b) and the outer surfaces of the respective side part of the door (3).

Abstract: Each one of the side edges (4a, 4b) of a door (3) is arranged to run inside and along a respective tube (5a, 5b) that has a longitudinal slit (6a, 6b) and extends vertically, in that each tube is fixed in relation to the furnace, in that the tubes (5a, 5b) are designed to spring back towards a respective position in which the slit (6a, 6b) is closed, and arranged to enclose the side edge (4a, 4b) of the door (3) along essentially the whole length of the side edge (4a, 4b) when the door (3) is in its closed position, and in that a liquid coolant is arranged to stream through the tubes (5a, 5b) and essentially fill up the whole space defined by the combination of the inner surfaces of each tube (5a, 5b) and the outer surfaces of the respective side part of the door (3).

Abstract: A method for the heat treatment of extended steel products such as, for example, rods, pipes, work pieces, etc., while the products are in motion. The products (13, 14, 33, 34, 35) are caused to be heated by DFI burners (6-11, 16-20) (where “DFI” is an abbreviation for “direct flame impingement”), which burners are caused to be located such that one set of burners (6, 7, 8, 9, 10, 11), (16, 17, 18, 19, 20) essentially covers the circumference of the products, and in the burners are caused to be located integrated into arrangements (2-4, 13) that transport the product in a direction that is perpendicular to a plane in which the flames of the burners essentially lie.

Abstract: A method for igniting a fuel/oxidant mixture in an industrial furnace. At least one fuel supply conduit and at least one oxidant supply conduit is provided, each conduit having an opening that opens on a side of the burner head that faces the furnace interior space. Fuel and oxidant are supplied to the burner head, and a light detector for detecting ultraviolet light, or other light wavelengths, is provided for detecting light that indicates the presence of a flame. A laser is positioned to emit a laser beam onto a point on the burner head adjacent the conduit outlets and to heat that point to a temperature exceeding the ignition temperature of the fuel/oxidant mixture. When the burner has ignited, the detector emits a signal to a control circuit that extinguishes the laser beam.

Abstract: A method and apparatus for heating a sheet-like material to a predetermined temperature profile along the length and across the width of the material. The sheet-like material is transported within a furnace relative to at least one burner holder above or below, or above and below, the material. Each burner holder includes a number of direct flame impingement burners located side-by-side in a row. The burners are directed toward the sheet-like material, and the individual burners in each burner holder are oriented and controlled so that heat output from the burners provides the predetermined temperature profile within the sheet-like material.