A process for operating an oxidizable combustion gas cleaning unit in a metallurgical plant, including the steps of: (a) passing an oxidizable combustion gas from a metallurgical reactor, in particular a blast furnace gas from a blast furnace, in a packed bed scrubber arrangement through a packed bed in countercurrent with a washing water or in a spray scrubber arrangement to remove cyanide compounds, in particular hydrogen cyanide, and to increase the removal of chloride compounds, in particular hydrogen chloride, from the combustion gas by solubilizing the cyanide and chloride compounds in the washing water, (b) collecting the washing water containing solubilized cyanide and chloride compounds at a bottom end of the packed bed or spray scrubber arrangement, and (c) collecting a cleaned oxidizable combustion gas at a top of the packed bed or spray scrubber arrangement, wherein a base is added to the washing water before step (a).

A process and a plant for preheating a metal charge fed in continuous to an electric melting furnace through a preheating tunnel provided with a horizontal conveyor, wherein the metal charge is hit, in countercurrent, by the exhaust fumes or gas leaving the electric melting furnace and by jets of gas ejected through a plurality of nozzles positioned on the hood of the tunnel. The nozzles are arranged in groups interspaced from each other in a longitudinal direction with respect to the tunnel, and generate a small-scale turbulence or inject small fast gas jets that can penetrate the main gas stream passing through the preheating tunnel, and simultaneously generate a horseshoe vortex structure composed of a descending central gas flow (downwash), and ascending flows (upwash) close to the side walls of the preheating tunnel, which enable a desired circulation of the gases.

An exhaust structure includes: a wall portion defining a first vertical exhaust path, a horizontal exhaust path, and a second vertical exhaust path, which communicate with one another; a supporting portion including a supporting portion body that is configured to be inserted into or removed from the horizontal exhaust path; and a receiving portion configured to be inserted into or removed from the supporting portion, wherein the receiving portion includes a receiving portion body that does not directly contact the wall portion due to the supporting portion body.

An exhaust stack for a submerged combustion melter includes a lower flue, an upper flue, an expansion joint between the lower and upper flues, and a hood. The lower flue is coupled to a tank of a submerged combustion melter and the upper flue and the lower flue are compliantly coupled together by the expansion joint. The hood is coupled to the upper flue and includes a circumferential shell that defines one or more diluent inlets for introducing a diluent directly into an exhaust material flowing through the exhaust stack. The exhaust material may also additionally be cooled in the lower flue, the upper flue, or both, prior to the exhaust material flowing through the hood. A submerged combustion melting system that includes a submerged combustion melter and the exhaust stack, as well as a method of cooling an exhaust material that exits a submerged combustion melter, are also disclosed.

The present invention relates to a denitration and waste heat recovery integrated furnace, comprising a denitration system, a desulfurization system and a waste heat recovery system. An air outlet of the denitration system is connected to an inlet of a dust collector (4), an outlet of the dust collector (4) is connected to an air inlet of the desulfurization system, an air outlet of the desulfurization system is connected to an air compressor (6) of the waste heat recovery system, and the waste heat recovered by the air compressor (6) is used for heat energy utilization of other departments.

The present invention relates to a denitration and waste heat recovery integrated furnace, comprising a denitration system, a desulfurization system and a waste heat recovery system. An air outlet of the denitration system is connected to an inlet of a dust collector (4), an outlet of the dust collector (4) is connected to an air inlet of the desulfurization system, an air outlet of the desulfurization system is connected to an air compressor (6) of the waste heat recovery system, and the waste heat recovered by the air compressor (6) is used for heat energy utilization of other departments.

An exhaust structure includes a piping section, wherein the piping section has a first inner diameter in a central region of the piping section, the piping section has a second diameter in at least one of an inlet or an outlet, and the second diameter has a same value as the first inner diameter. The exhaust structure further includes a plurality of smoothing layers configured to resist turbulence and condensation produced by a flow of one or more gasses in the piping section.

Described is a device for recovering heat and fumes from slag resulting from the steel production cycle which allows the heat emitted by the slag during the cooling to be used without the need to collect the slag in tubs which must then be transported to the cooling surface and tipped in order to discharge the slag; at the same time, this device allows the fumes and consequently the heat and the pollutants which the slag emits during the tipping and the time on the cooling surface to be conveyed and treated.

An apparatus to move and preheat metal material (M) to be fed to a container comprises a containing structure, having an internal compartment and provided with a support wall, a conveyor for the material (M), a fume transit section whose volume reduces as it is distanced from said container along the longitudinal development of said containing structure, and a collector for hot fumes (F) whose volume increases in a manner correlated to said reduction in the fume transit section. The collector is located below said conveyor inside the internal compartment essentially along the entire longitudinal development of said containing structure. Moreover, one or more through apertures are made in said support wall to put the conveyor and the collector into fluidic connection.

A liner fabrication tool includes a handle engaged to a first cam support and a second cam support where each of the cam supports has forward edge. An axle extends between the first cam support and the second cam support. A gripper is rotatably engaged to the axle between the first cam support and the second cam support. The gripper includes a first wall, a second wall, and a base extending between the first wall and the second wall, the base has an opening where the opening is positioned between and proximate to the forward edges. The opening receives a pin of a liner and insulation system where rotation of the handle in a forward direction applies leverage against the first cam support and the second cam support to bind the pin in the opening and compress the liner and insulation system immediately prior to welding.