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 process to treat/clean a gas, containing SO.sub.2, CO.sub.2 and O.sub.2 comprising the steps of: bringing the gas in contact with an activated carbon catalyst, converting SO.sub.2 to SO.sub.3/H.sub.2SO.sub.4 on the activated carbon catalyst, washing the SO.sub.3/H.sub.2SO.sub.4 from the activated carbon catalyst to obtain a sulfuric acid solution and a SO.sub.2 depleted gas; bringing the SO.sub.2 depleted gas in contact with an aqueous ammonia solution wherein CO.sub.2 is converted to obtain a SO.sub.2 and CO.sub.2 depleted gas containing ammonia; and bringing the SO.sub.2 and CO.sub.2 depleted gas containing ammonia in contact with the sulfuric acid solution obtained in step a. to form a solution containing ammonium sulfate and a treated, clean gas.

A method of removing carbon dioxide from flue gas is disclosed. The method comprises mixing the flue gas with ammonia; and contacting the gas mixture with calcium nitrate solution to produce calcium carbonate precipitates and ammonium nitrate solution; or contacting the gas mixture with sodium nitrate solution to produce sodium carbonate precipitates and ammonium nitrate solution. The carbonate/bicarbonate precipitates are recovered by separating the carbonate/bicarbonates (s) from said solutions. An apparatus for performing the above method is also disclosed. The apparatus comprises a reaction vessel with an inlet to receive said solution and an inlet to receive and deliver a flue gas-ammonia mixture to a gas-liquid contactor which is configured to diffuse said gas mixture into either calcium nitrate or sodium nitrate solution. The reaction vessel is also provided with an impellor and draft tube configured to circulate the diffused gas mixture throughout the calcium nitrate or sodium nitrate solution for a period of time sufficient to produce carbonate/bicarbonate precipitates locking the CO2 into a solid form.

Disclosed are a system and a method for desulfurization and denitrification of an alumina calcination flue gas, and a use. The system comprises an ozone generator, a red mud pre-impregnation slurry scrubbing tower, and a red mud pre-impregnation tank and a red mud pre-impregnation clear liquid scrubbing tower. NO.sub.x in a flue gas is oxidized into a high valence oxynitride by ozone, and with the red mud as an absorbent, the synergistic absorption of SO.sub.2 and NO.sub.x in the flue gas is achieved, while the dealkalization of the red mud is achieved. By means of the synergistic catalytic oxidation of metal ions such as Fe.sup.3+ in a red mud slurry and ozone, the synergistic absorption of sulfur and oxynitride is prompted; and the use of a structure of staged absorption in two towers overcomes the problem of the difficulty in absorbing NO.sub.2 with a low O.sub.3/NO.sub.x molar ratio.

Disclosed are a system and a method for desulfurization and denitrification of an alumina calcination flue gas, and a use. The system comprises an ozone generator (1), a red mud pre-impregnation slurry scrubbing tower (3), and a red mud pre-impregnation tank (5) and a red mud pre-impregnation clear liquid scrubbing tower (10). NO.sub.x in a flue gas is oxidized into a high valence oxynitride by ozone, and with the red mud as an absorbent, the synergistic absorption of SO.sub.2 and NO.sub.x in the flue gas is achieved, while the dealkalization of the red mud is achieved. By means of the synergistic catalytic oxidation of metal ions such as Fe.sup.3+ in a red mud slurry and ozone, the synergistic absorption of sulfur and oxynitride is prompted and the material consumption of the subsequent desulfurization and denitrification is reduced; and the use of a structure of staged absorption in two towers overcomes the problem of the difficulty in absorbing NO.sub.2 with a low O.sub.3/NO.sub.x molar ratio by enhancing absorption with sodium alkali in a second stage tower, while decreasing the consumption of and risk of escape of the ozone, wherein same has the advantages of a high purification efficiency and a low operation cost, and has a stronger applicability to the alumina calcination flue gas.

The present invention discloses a method and device for purifying CO from a flue gas and coupling-suppressing white fog, where the flue gas is introduced into a ceramic honeycomb carrier coated with a CO catalyst, sufficient O.sub.2 in the flue gas is utilized to generate CO.sub.2 from a low concentration of CO through catalytic oxidation, so as to achieve the purpose of purifying CO, and the flue gas is heated up by the heat released from the catalytic oxidation reaction to more than 110° C. and then discharged into the air, which meets the temperature requirement of coupling-suppressing white fog; the device includes a CO concentration sensor, a temperature sensor, a CO catalytic oxidation layer, an oxidation reaction tower, a desulfurized sintering flue gas, a packing layer I, a packing layer II, a chimney, and a solenoid valve II.

The present invention discloses a gas hydrate-based particulate/waste gas simultaneous removal system and method. R134a can be used to synthesize particulates/coking waste gases into gas hydrate, which can realize the simultaneous removal of particulates/coking waste gases with no pollution and low energy consumption. The system comprises a waste heat recovery device, a gas hydrate primary dust removal tower, a solid-liquid separation primary tower, a gas hydrate secondary dust removal tower, a solid-liquid separation secondary tower, a gas hydrate decomposition pool, a gas-solid separation tower and a low temperature fractionation device. The present invention can achieve the removal of harmful substances such as heavy metals and coking waste gases while removing particulates. Compared with the current particulate control and waste gas treatment device, the gas hydrate method-based device is greatly simplified and can effectively remove multiple pollutants and realize energy saving and environmental protection.

According to embodiment, a carbon dioxide capturing system cools a regenerator discharge gas discharged from a regenerator 5 containing carbon dioxide by a cooling unit 8, and then sends the gas to a cleaner 9. The cleaner 9 receives condensed water generated from the regenerator discharge gas cooled by the cooler 9, and a gaseous cooled regenerator discharge gas, and cleans the cooled regenerator discharge gas by a cleaning liquid. The cleaner 9 has a first liquid reservoir 9b configured to store the condensed water, and a second liquid reservoir 9c configured to store the cleaning liquid having cleaned the cooled regenerator discharge gas.

An apparatus and a method are useful for removing pollutants from process effluent gas produced by an electrolytic cell used in an aluminum production plant to produce aluminum. The apparatus and method use a flow control device to control alumina supply to an electrolytic cell and to a dry scrubber contact reactor.

A method of removing carbon dioxide from flue gas is disclosed. The method comprises mixing the flue gas with ammonia; and contacting the gas mixture with calcium nitrate solution to produce calcium carbonate precipitates and ammonium nitrate solution; or contacting the gas mixture with sodium nitrate solution to produce sodium carbonate precipitates and ammonium nitrate solution. The carbonate/bicarbonate precipitates are recovered by separating the carbonate/bicarbonates (s) from said solutions. An apparatus for performing the above method is also disclosed. The apparatus comprises a reaction vessel with an inlet to receive said solution and an inlet to receive and deliver a flue gas-ammonia mixture to a gas-liquid contactor which is configured to diffuse said gas mixture into either calcium nitrate or sodium nitrate solution. The reaction vessel is also provided with an impellor and draft tube configured to circulate the diffused gas mixture throughout the calcium nitrate or sodium nitrate solution for a period of time sufficient to produce carbonate/bicarbonate precipitates locking the CO2 into a solid form.