The invention discloses a process and device for desulfurization-denitration of a flue gas. A desulfurization-denitration solution is used in an absorption tower to absorb sulfur dioxide and/or nitrogen oxides from the flue gas or various combustion tail (waste) gases. The desulfurization-denitration solution with absorbed sulfur dioxide and/or nitrogen oxides releases the sulfur dioxide and/or nitrogen oxides by heating and/or gas stripping and/or vacuum regeneration in a regeneration tower. The released sulfur dioxide and/or nitrogen oxides are further concentrated into a sulfur dioxide and/or nitrogen oxide product with a higher purity in a concentration tower. The regenerated desulfurization-denitration solution is recycled for use. The process and device have a wide range of industrial applications, and can be used for desulfurization and/or denitration of flue gases, incineration gases, coke-oven gases, synthetic waste gases from dyestuff plants, pollutant gases discharged from chemical fiber plants and other industrial raw material gases or waste gases containing SOx.

The invention discloses a process and device for desulfurization-denitration of a flue gas. A desulfurization-denitration solution is used in an absorption tower to absorb sulfur dioxide and/or nitrogen oxides from the flue gas or various combustion tail (waste) gases. The desulfurization-denitration solution with absorbed sulfur dioxide and/or nitrogen oxides releases the sulfur dioxide and/or nitrogen oxides by heating and/or gas stripping and/or vacuum regeneration in a regeneration tower. The released sulfur dioxide and/or nitrogen oxides are further concentrated into a sulfur dioxide and/or nitrogen oxide product with a higher purity in a concentration tower. The regenerated desulfurization-denitration solution is recycled for use. The process and device have a wide range of industrial applications, and can be used for desulfurization and/or denitration of flue gases, incineration gases, coke-oven gases, synthetic waste gases from dyestuff plants, pollutant gases discharged from chemical fiber plants and other industrial raw material gases or waste gases containing SOx.

The invention discloses a process and device for desulfurization-denitration of a flue gas. A desulfurization-denitration solution is used in an absorption tower to absorb sulfur dioxide and/or nitrogen oxides from the flue gas or various combustion tail (waste) gases. The desulfurization-denitration solution with absorbed sulfur dioxide and/or nitrogen oxides releases the sulfur dioxide and/or nitrogen oxides by heating and/or gas stripping and/or vacuum regeneration in a regeneration tower. The released sulfur dioxide and/or nitrogen oxides are further concentrated into a sulfur dioxide and/or nitrogen oxide product with a higher purity in a concentration tower. The regenerated desulfurization-denitration solution is recycled for use. The process and device have a wide range of industrial applications, and can be used for desulfurization and/or denitration of flue gases, incineration gases, coke-oven gases, synthetic waste gases from dyestuff plants, pollutant gases discharged from chemical fiber plants and other industrial raw material gases or waste gases containing SOx.

The invention discloses a process and device for desulfurization-denitration of a flue gas. A desulfurization-denitration solution is used in an absorption tower to absorb sulfur dioxide and/or nitrogen oxides from the flue gas or various combustion tail (waste) gases. The desulfurization-denitration solution with absorbed sulfur dioxide and/or nitrogen oxides releases the sulfur dioxide and/or nitrogen oxides by heating and/or gas stripping and/or vacuum regeneration in a regeneration tower. The released sulfur dioxide and/or nitrogen oxides are further concentrated into a sulfur dioxide and/or nitrogen oxide product with a higher purity in a concentration tower. The regenerated desulfurization-denitration solution is recycled for use. The process and device have a wide range of industrial applications, and can be used for desulfurization and/or denitration of flue gases, incineration gases, coke-oven gases, synthetic waste gases from dyestuff plants, pollutant gases discharged from chemical fiber plants and other industrial raw material gases or waste gases containing SOx.

A process for removing sulphur dioxide from the gaseous effluent of a smelter furnace comprising the steps of: providing the gaseous effluent from a smelter; separating the sulphur dioxide from the gaseous effluent to provide concentrated sulphur dioxide and effluent for discharge into the atmosphere; mixing the concentrated sulphur dioxide with a fuel gas; heating the mixture such that the concentrated sulphur dioxide and fuel gas react to form a gaseous product mixture comprising sulphur and hydrogen sulphide; and removing the majority of preferably substantially all of the sulphur and hydrogen sulphide from the gaseous product mixture; wherein the remaining gaseous product mixture is incinerated before being vented into the atmosphere or is recycled into the smelter furnace.

A process for removing sulphur dioxide from the gaseous effluent of a smelter furnace comprising the steps of: providing the gaseous effluent from a smelter; separating the sulphur dioxide from the gaseous effluent to provide concentrated sulphur dioxide and effluent for discharge into the atmosphere; mixing the concentrated sulphur dioxide with a fuel gas; heating the mixture such that the concentrated sulphur dioxide and fuel gas react to form a gaseous product mixture comprising sulphur and hydrogen sulphide; and removing the majority of preferably substantially all of the sulphur and hydrogen sulphide from the gaseous product mixture; wherein the remaining gaseous product mixture is incinerated before being vented into the atmosphere or is recycled into the smelter furnace.

A method for removing a target substance from a gas is provided. The method comprises providing a capture medium comprising an alkaline aqueous solution for dissolving the target substance comprised in the gas to form a target ion in the capture medium, contacting the target substance comprised in the gas with the capture medium to form a target ion in the capture medium, and transporting the target ion comprised in the capture medium to a process medium via an ion transport mechanism, wherein the process medium comprises an aqueous solution comprising an ion having an electric charge opposite to that of the target ion, and which interacts with the target ion to form a compound in the process medium, wherein the ion transport mechanism is adapted to allow a flow of ions between the capture medium and the process medium to maintain charge balance. An apparatus for removing a target substance from a gas, and use of the method and apparatus disclosed herein in treatment of industrial exhaust gas or air are also provided.