Method and installation for treating a CO.sub.2- and H.sub.2O-containing flue gas generated by an industrial process unit before CCUS, whereby the flue gas evacuated from the unit is subjected to cooling to a temperature T2 between 100 and 600° C., whereby the cooled flue gas is pretreated in one or more particle removal and/or gas cleaning and/or drying stages and the temperature of the cooled flue gas is further reduced to a temperature T3<T2, before a first part of pretreated flue gas is subjected to CCUS, a second part of the pretreated flue gas being recycled at temperature T3 as a cooling agent and mixed with the flue gas during the controlled cooling thereof, partially or fully purified CO.sub.2 from the CCUS may be recycled at temperature T4<T2 may be recycled as a cooling agent and mixed with the flue gas during the controlled cooling.

A system and method for recovering sulfur in a copper smelting process includes removing fine dust from high-concentration SO.sub.2 flue gas from a matte smelting furnace, introducing the flue gas into a fluidized bed carbothermic reduction tower to be reduced by a carbon-based reducing agent to obtain reducing gas, passing the reducing gas through a high temperature separator to separate down unsaturated powder coke contained in the reducing gas, and condensing the reducing gas to obtain sulfur. The saturated powder coke entrained in the reducing gas enters a desorption tower to desorb SO.sub.2 gas therein, and the desorbed powder coke enters a fluidized bed sulfur reduction tower to continue to participate in the reduction reaction. Part of the SO.sub.2 gas discharged from the desorption tower is discharged to the fluidized bed carbothermic reduction tower to produce sulfur, and the other part enters a desulfurization tower.

The invention discloses an integrated deep purification device for removing sulfur, nitrate, dust and fluorine. The core component of the device is a purification system; the purification system comprises a headstock, a container and a purification system which are connected with the back of the headstock, and the purification system is arranged in the container, and comprises a purification tower I and a purification tower II, wherein the purification tower I comprises a tower body I, corona electrodes I and conductive filters; the purification tower II comprises a tower body II, corona electrodes II, a sprinkler system and electrofiltration coupling units.

The present disclosure provides systems for carbon capture in combination with production of one or more industrially useful materials. The disclosure also provides methods for carrying out carbon capture in combination with an industrial process. In particular, carbon capture can include carrying out calcination in a reactor, separation of carbon dioxide rich flue gases from industrially useful products, and capture of at least a portion of the carbon dioxide for sequestration of other use, such as enhanced oil recovery.

An automatic control system (ACS) for capturing and utilizing carbon dioxide (CO.sub.2) of one or more gases from one or more plants may receive, from one or more sensors, one or more parameters of at least one gas of one or more gases through a system gas flow inlet channel, a first volumetric flow rate of the one or more gases through a plug flow reactor (PFR), a second volumetric flow rate of the one or more gases through a bypass channel that bypasses the PFR, the CO.sub.2 flowing into the CO.sub.2 capture unit, or the syngas flowing into the CO.sub.2 capture unit. The ACS may also command one or more flow controllers to modulate at least one of the first volumetric flow rate of the one or more gases through PFR or the second volumetric flow rate of the one or more gases through the bypass channel based on the one or more parameters.

Provided herein are methods of removing carbon dioxide from an aqueous stream or gaseous stream by: contacting the gaseous stream comprising carbon dioxide, when present, with an aqueous solution comprising ions capable of forming an insoluble carbonate salt; contacting the aqueous solution comprising carbon dioxide with an electroactive mesh that induces its alkalinization thereby forcing the precipitation of a carbonate solid from the solution and thereby the removal of dissolved inorganic carbon by electrolysis; and removing the precipitated carbonate solids from the solution, or the surface of the mesh where they may deposit. Also provided herein are flow-through electrolytic reactors comprising an intake device in fluid connection with a rotating cylinder comprising an electroactive mesh, and a scraping device and/or liquid-spray based device for separating a solid from the mesh surface.

A system and method for recovering sulfur in a copper smelting process, in which fine dust is removed from high-concentration SO.sub.2 flue gas from a matte smelting furnace, the flue gas is introduced into a fluidized bed carbothermic reduction tower and reduced by a carbon-based reducing agent to obtain reducing gas, which is introduced into a high temperature separator. The separated reducing gas contains unsaturated powder coke, and the reducing gas is condensed to obtain sulfur. The saturated powder coke entrained enters a desorption tower to desorb SO.sub.2 gas, and the desorbed powder coke enters a fluidized bed sulfur reduction tower. Part of the SO.sub.2 gas discharged from the desorption tower is discharged to the fluidized bed carbothermic reduction tower to produce sulfur, and the other part is introduced into a desulfurization tower.

The invention relates to a reactor for purifying a gas flow by contact with a liquid. The reactor comprises a chamber which delimits a channel having an inlet opening and an outlet opening for the gas flow. The chamber has walls made of a flexible material which is secured to an inflatable structure which is provided with means for retaining pressurised air therein in order to form a self-supporting flexible structure with trapped air.

A reduction device, an acid gas recovery device, a recovery device collector, and a first removed substance returning line are provided. The reduction device is configured to perform a reduction process to turn iron oxide to reduced iron by adding a reducing agent. The acid gas recovery device is configured to recover CO.sub.2 being acid gas with CO.sub.2 absorbing liquid being acid gas absorbing liquid from exhaust gas containing at least powder-shaped iron-based solid substances and the acid gas, which are discharged from the reduction device. The recovery device collector is configured to collect the iron-based solid substance contained in the absorbing liquid with a filter. The iron-based solid substances collected by the recovery device collector are removed, and removed substances containing the removed iron-based solid substances are returned to the reduction device side through the first removed substance returning line.

The invention relates to a method for treating metal strip in a directly fired furnace through which the metal strip is guided. The furnace is fired directly by gas burners and has a non-fired zone through which the exhaust gases from the fired zone flow and thus heat the metal strip. After leaving the non-fired zone, the exhaust gases from the furnace undergo post-combustion in an afterburner chamber. According to the invention, methane is injected into the non-fired zone, which causes nitrogen oxides contained in the waste gas to be converted into hydrogen cyanide.