Method and device for purifying the flue gases of a sintering process of ores and/or other material-containing materials in metal production

An apparatus for the purification of waste gas of an at least partially burnt solid fuel, wherein said waste gas contains one or more gasses selected from the group consisting of CO2, CO, O2, H2O and N2, and one or more pollutants selected from the group consisting of NOx, SOx, HCl, Hg, dioxins, furans, dusts, and sublimatable residues, condensable residues, heavy hydrocarbons, and heavy metals;

• characterized by:
• a moving bed reactor, tilled with a lower and an upper adsorption agent and/or absorption agent layer, with a lower horizontal gas inflow and a bulk material removal tray, through which said waste gas can flow from below into a lower layer of said adsorption and/or absorption agent already polluted with NOx, and/or N2, and SOx;
• a mixing element, subsequently inserted on an upper free surface of said lower adsorption and/or absorption agent layer, for intimate mixing of said waste gas, purified of a main quantity of SOx, with an ammonium-containing compound;
• an upper, horizontal gas inflow and said bulk material removal tray of said moving bed reactor, without blocking elements in an area of upper gas inflow and said hulk material removal tray, through which said waste gas, mixed with said ammonium-containing compound and purified of said main quantity of SOx can flow from below, into said upper layer of said adsorption and/or absorption agent already polluted with NOx or N2 and small quantities of SOx;
• an upper free surface of said upper adsorption and/or absorption agent layer from which said waste gas, purified of said main quantity of SOx and NOx components, can leave said adsorption and/or absorption layer, so as to subsequently leave said moving bed reactor;
• a bulk material-distributing tray on said upper end of said moving bed reactor that can be supplied by fresh and/or regenerated adsorption and/or absorption agent, via said upper free surface of said upper layer of said adsorption agent and/or absorption agent, from above;
• bulk material discharge elements, on or below said lower gas inflow and said bulk material removal tray, taking place by subsequent conducting, removal, and migration rate of said adsorption and/or absorption agent;
• and,
• control means of said bulk material discharge elements, by means of which a loading quantity of said adsorption and/or absorption agent in said upper layer of said moving bed reactor can be adjusted with SOx to a pre-specifiable quantity fraction, relative to said loaded adsorption and/or absorption agent, by corresponding actuation of said bulk material discharge elements, below or on said lower gas inflow and said bulk material removal tray.

A method for the purification of waste gas that contains one or more gasses selected from the group consisting of CO2, CO, O2, H2O and N2, and one or more pollutants selected from the group consisting of NOx, SOx, HCl, HS, Hg, dioxins, furans, dusts, sublimatable residues and condensable residues, heavy hydrocarbons, and heavy metals, said method including the steps of:

• a. flowing said waste gas into a moving bed reactor from below through a lower horizontal gas inflow and bulk material removal tray of the moving bed reactor, into a lower layer of adsorption and/or absorption agent already polluted with NOx and SOx and/or other pollutants, and with a throughflow of a lower adsorption agent and/or absorption agent layer, adsorbs at least a main quantity of SOx from said waste gas in a pore system of said adsorption an/or absorption agent, loaded with NOx and/or N2;
• b. removing said waste gas from said lower adsorption and/or absorption agent layer on its upper free surface so as to be intimately mixed subsequently for conversion of said NOx with ammonium-containing compound;
• c. flowing said waste gas that is mixed with said ammonium-containing compound and purified of said main quantity of SOx from below through an upper horizontal gas inflow and a bulk material removal tray of said moving bed reactor, an upper layer of said adsorption and/or absorption agent already polluted with NOx, N2 and/or SOx with throughflow of said upper adsorption and/or absorption agent layer, adsorbs at least a main quantity of NOx components from said waste gas and/or their reaction products, on a surface of said adsorption and/or absorption agent, loaded with NOx N2 and/or SOx;
• d. removing said waste gas that is purified of said main quantity of SOx and NOx components from said upper adsorption and/or absorption agent layer on its upper free surface, so as to subsequently leave said process;
• e. supplying fresh and/or regenerated adsorption and/or absorption agent to said upper free surface of said upper layer of said adsorption and/or absorption agent, via a bulk material-distributing tray, on the upper end of said moving bed reactor and without interruption by blocking elements in an area of upper gas inflow and said bulk material removal tray, subsequently migrates completely through said upper and lower layers of said entire moving bed reactor, gradually, from above downwards, and thereby successively, is initially loaded with NOx or N2 and water vapor on its surface, and subsequently with SOx in its pore system, and subsequently migrates through a lower gas inflow and said bulk material removal tray of said moving bed reactor, a subsequent conducting, removal, and migration rate of said adsorption agent and/or said absorption agent takes place via bulk material discharge elements, below or on said lower gas inflow and said bulk material removal tray;
• and,
• f. loading a quantity of said adsorption and/or absorption agent in said upper layer of said moving bed reactor with SOx is adjusted to a pre-specifiable quantity fraction, relative to said loaded adsorption and/or absorption agent, by corresponding actuation of said bulk material discharge elements, below or on said lower gas and said bulk material removal tray.