This invention involves with a gasification system, which includes a gasifier, which gasifier comprises a gasification chamber for producing syngas from coal slurry and a quench chamber for cooling the syngas from the gasification chamber. The mentioned gasification system also comprises preheater located in the quench chamber for utilizing heat in the quench chamber to preheat the coal slurry before the coal slurry enters the gasification chamber. Wherein, the preheater comprises a pipe device defining a passage for the coal slurry to pass through, the passage in communication with the gasification chamber and upstream of the gasification chamber in a flow direction of the coal slurry. This invention also involves with a preheater used in the mentioned gasification system and the gasification method of the mentioned gasification device.

This invention involves with a gasification system, which includes a gasifier, which gasifier comprises a gasification chamber for producing syngas from coal slurry and a quench chamber for cooling the syngas from the gasification chamber. The mentioned gasification system also comprises preheater located in the quench chamber for utilizing heat in the quench chamber to preheat the coal slurry before the coal slurry enters the gasification chamber. Wherein, the preheater comprises a pipe device defining a passage for the coal slurry to pass through, the passage in communication with the gasification chamber and upstream of the gasification chamber in a flow direction of the coal slurry. This invention also involves with a preheater used in the mentioned gasification system and the gasification method of the mentioned gasification device.

A method for preheating metal pellets before charging into a melting furnace, wherein the pellets are transported by a conveyor belt to a chute and discharged from the chute into the melting furnace, the method including heating the pellets by direct flame impingement from two or more banks of burners, wherein the two or more banks of burners comprise an upstream bank of burners and a downstream bank of burners; and controlling the upstream bank of burners to operate oxygen-rich so as to create an oxidizing zone and the downstream bank of burners to operate fuel-rich so as to create a reducing zone.

A method for preheating metal pellets before charging into a melting furnace, wherein the pellets are transported by a conveyor belt to a chute and discharged from the chute into the melting furnace, the method including heating the pellets by direct flame impingement from two or more banks of burners, wherein the two or more banks of burners comprise an upstream bank of burners and a downstream bank of burners; and controlling the upstream bank of burners to operate oxygen-rich so as to create an oxidizing zone and the downstream bank of burners to operate fuel-rich so as to create a reducing zone.

An integrated aluminum melting and holding system is provided. The system includes, in combination, a hearth for receiving and melting a charge of aluminum pieces, a holding chamber for maintaining the elevated temperature for casting, and a well to allow removal of the molten aluminum for delivery to a casting station. The hearth includes a combustion chamber having a fuel burner section communicating with the hearth for burning hydrocarbon fuel with air to produce effluent hot gases in the burner section for circulation through the hearth for melting the aluminum pieces. The holding chamber receives molten aluminum from the hearth. The holding chamber has at least a substantial portion positioned below a substantial portion of the hearth. The holding chamber includes at least one immersion heater in contact with the molten aluminum. The holding chamber further includes a lid configured to contact the molten aluminum disposed within the holding chamber. The open top well is in fluid communication with the holding chamber for receiving the molten aluminum.

A method and an apparatus for producing direct reduced iron (DRI) move a material comprising iron ore and biomass through a preheat zone (20) and then a reduction zone (30) of a hearth furnace (3) and heat and progressively reduce iron ore and discharge DRI. Reduction gases flow in an opposite direction to material, and combustible gases in the reduction gases are combusted in the preheat zone and generate heat. Microwave energy heats material and reduces iron ore in the reduction zone. The microwave energy is supplied via a plurality of microwave applicators (66) arranged in a plurality of rows of applicators extending across a width of and along a section of a length of the reduction zone. The reduction zone (56) includes a lower sub zone (58) and an upper sub zone separated by an interface (80). The interface is configured to so that (a) microwave energy is at least substantially prevented from passing through the interface to the upper sub zone and (b) reduction gases produced in the lower sub zone from reduction of iron ore can flow through the interface into the upper sub zone.

A method and an apparatus for producing direct reduced iron (DRI) move a material comprising iron ore and biomass through a preheat zone (20) and then a reduction zone (30) of a hearth furnace (3) and heat and progressively reduce iron ore and discharge DRI. Reduction gases flow in an opposite direction to material, and combustible gases in the reduction gases are combusted in the preheat zone and generate heat. Microwave energy heats material and reduces iron ore in the reduction zone. The microwave energy is supplied via a plurality of microwave applicators (66) arranged in a plurality of rows of applicators extending across a width of and along a section of a length of the reduction zone. The reduction zone (56) includes a lower sub zone (58) and an upper sub zone separated by an interface (80). The interface is configured to so that (a) microwave energy is at least substantially prevented from passing through the interface to the upper sub zone and (b) reduction gases produced in the lower sub zone from reduction of iron ore can flow through the interface into the upper sub zone.

High temperature furnaces, calcining, pyrolysis and other high temperature manufacturing processes, composition rearrangements, and equipment. Systems, equipment and processes using oxyfuel combustion using gaseous fuels for cement manufacture. Reactor furnaces using oxyfuel containing natural gas and gravity feed to process pellets forming a pellet bed into cement.

High temperature furnaces, calcining, pyrolysis and other high temperature manufacturing processes, composition rearrangements, and equipment. Systems, equipment and processes using oxyfuel combustion using gaseous fuels for cement manufacture. Reactor furnaces using oxyfuel containing natural gas and gravity feed to process pellets forming a pellet bed into cement.

Molten iron is produced in an electric furnace with high energy utilization efficiency at a low cost. In an electric furnace in which a shaft-type preheating chamber is provided on and continuously with a melting chamber and used to preheat iron scrap, an exhaust gas generated in the melting chamber is passed through the preheating chamber filled with the iron scrap so as to preheat the iron scrap, the iron scrap thus preheated is sequentially caused to descend in the preheating chamber so as to be supplied into the melting chamber, and the iron scrap is melted in the melting chamber to obtain molten iron m.