A method and an apparatus for recycling a significant amount of heat within a linear hearth furnace by means of an endless conveyor that transports briquettes through the furnace from an inlet (briquette feed) end to an outlet (DRI discharge) end and then returns to the inlet end and transfers a significant amount of heat from the outlet end to the inlet end of the furnace.

A method for treating a metal strip, where the metal strip undergoes heat treatment in a directly fired furnace and is subsequently heat-treated further in a radiant tube furnace. At least part of the exhaust gases from the radiant tubes is fed to the directly fired furnace.

The present disclosure relates to a tempering furnace for a glass sheet, which has a conveyor for the glass sheet, first convection blow means over the conveyor to heat the glass sheet by hot air jets blown on its top and/or bottom surface, and second convection blow means to help lead pressurized air from outside the tempering furnace to second blow nozzles from which air is discharged as jets towards the top and/or bottom surface of the glass sheet. The heating effect of the air jets on the glass sheet is adjustable by adjusting the feeding of electric current to electric elements inside blowing channels. Blow nozzles of the second convection blow means form blow zones. The heating effect on the glass sheet of the jets discharged from the second blow nozzles inside the blow zones is adjustable by adjusting the blowing pressure of feed pipes.

An oxidation furnace for the oxidative treatment of fibers, in particular for producing carbon fibers, the furnace having a housing with an inner space which is gas-tight apart from areas for the passage of the fibers. A process chamber is located in the inner space of the housing. Guide rollers guide the fibers arranged adjacently as a fiber carpet in a serpentine manner through the process chamber, the fiber carpet spanning respective planes between opposite guide rollers, a partial area of the inner space being defined both above and below said planes. The process chamber extends between a primary blowing device arranged on a blowing end of the housing and a primary suction device, where a primary gas is blown into a partial area by the primary blowing device in such a way that the process gas flows through the process area in a process flow direction. A secondary gas can be blown into the partial area by a secondary blowing device, on the side of the primary blowing device located at a distance from the process chamber, using a flow sealing device.

A furnace having a convection section with convection tubes in a convection compartment is disclosed. The convection tubes receive and preheat hydrocarbon feed primarily by convection of heat from hot flue gas that flows into in the convection section. The convection section additionally includes a perforated distributor plate that prevents flow channeling of the hot flue gas as it flows into the convection section. The furnace also includes a radiant section having radiant tubes in a radiant compartment. The radiant tubes are in fluid communication with the convection tubes so that preheated hydrocarbon feed flows from the convection section to the radiant section. The radiant section burns fuel and heats the preheated hydrocarbon feed primarily by radiation and from the hot flue gas, which flows from the radiant section into the convection section.

The invention relates to a method for sintering carbon bodies (16) in a furnace comprising at least a first furnace chamber (11) for receiving the carbon bodies, which are accommodated in a packing material (23), the carbon bodies being arranged between lateral chamber walls (12, 13, 21) of the furnace chamber, and the furnace chamber serving to form a preheating zone V, a heating zone H provided with a heating device, and a cooling zone A, wherein a packing material (23) made, at least in part, of a highly heat-conductive material is used.

A furnace for thermal treatment, in particular for carbonization and/or graphitization, of material, in particular fibers, in particular fibers of oxidized polyacrylonitrile PAN. During the thermal treatment, a pyrolysis gas is released from the material. The furnace includes a housing, a process space, which is located in the interior of the housing and is delimited by a process space housing and through which the material can be fed, a heating system for heating, a process space atmosphere prevailing in the process space, and an extraction system for suctioning process space atmosphere laden with pyrolysis gas from the process space. The extraction system has at least one suction device having a suction channel which is delimited by a channel wall and which is connected to the process space by means of a suction opening. The suction opening is arranged in a region of the process space in which, during operation of the furnace a temperature prevails at which no or only moderate chemical reactions occur between the pyrolysis gas and the process space housing and/or the channel wall.

Continuous annealing equipment (1) including a cleaning device (11, 12) for performing a cleaning treatment on a steel strip (S) and an annealing device (12) for performing an annealing treatment on the steel strip (S) comprises an exhaust gas passage (31, 41) through which an exhaust gas discharged from the annealing device (12) flows, a solution circulation passage (32, 51) through which a cleaning solution used in the cleaning device (11, 12) circulates, and a heat exchanger (53) which forms a part of the solution circulation passage (32, 51) and contacts with the exhaust gas.

The present invention describes an oven system for temperature-controlling a metal component (101), in particular an aluminium strip. The oven system has a first temperature-control section (110) for temperature-controlling the metal component at a first temperature, a second temperature-control section (120) for temperature-controlling the metal component at a second temperature, and a temperature-control device (102) for temperature-controlling a temperature-control fluid. The first temperature-control section (110) and the second temperature-control section (120) are configured such that the metal component (101) is conveyable between the first temperature-control section (110) and the second temperature-control section (120). The first temperature-control section (110) has a first fluid inlet having a first control valve (111) for controlling a fluid flow of the temperature-control fluid into the first temperature-control section (110). The second temperature-control section (120) has a second fluid inlet having a second control valve (121) for controlling a fluid flow of the temperature-control fluid into the second temperature-control section (120). The temperature-control device (102) is coupled to the first control valve (111) and the second control valve (121), such that a first fluid flow of the temperature-control fluid into the first temperature-control section (110) and a second fluid flow of the temperature-control fluid into the second temperature-control section (120) are controllable.

A heat-recovering oven system based on temperature gradient comprises: multiple chambers arranged in a sequence, the chambers configured for operating at various temperatures according to a temperature gradient arrangement that spans the sequence; a conveyor configured for transporting product through the multiple chambers in the sequence for heat treatment according to the temperature gradient arrangement; and multiple temperature-segregated heat exchanger systems, each heat exchanger system including a heat exchanger, a conduit to at least one of the chambers based on its temperature in the temperature gradient arrangement, and a return conduit from the at least one chamber to the heat exchanger.