Adsorber for cleaning exhaust gases and associated method

Abstract

The invention relates to an adsorber (1a, 1b) for cleaning exhaust gas containing at least SOx and NOx, having: a gas distributor floor (2) for supplying the exhaust gas; a bulk material region (4) which is arranged above the gas distributor floor (2) and which is filled with adsorption and/or absorption medium, wherein the bulk material region (4) has a lower portion (9) and an upper portion (10), wherein the lower portion (9) is arranged above the gas distributor floor (2) and the upper portion (10) is arranged above the lower portion (9); - an extraction device (5) arranged above the bulk material region (4) for the purpose of extracting the exhaust gas which flows upwards from below; - a removal device (3) for removing the adsorption and/or absorption medium; - a hopper (6), arranged above the extraction device (5), for supplying the adsorption and/or absorption medium which travels through the bulk material region (4) from top to bottom; - a lance (7) which, in a transition regionbetween the upper (9) and the lower (10) portion of the bulk material region (4), projects into the bulk material region (4) and has at least one opening (25) for the direct injection of an ammonia-containing gas into the bulk material region (4). Also disclosed is a method for cleaning the exhaust gas.

Description

technical field [0001] The present invention relates to an adsorber and a method for purifying at least x and NO x Components of the off-gassing method. Background technique [0002] At present, the requirements for the purification degree of the waste gas produced in the industrial production process are constantly increasing. In terms of exhaust emissions, harmful substances such as NO x , SO x , HCl, dioxins, furans, heavy metals and dust concentrations must comply with legal maximum limit values. In the exhaust gas purification process, the desulfurization and denitrification of exhaust gas are particularly important. Among them, desulfurization is to convert sulfur dioxide (SO 2 ) and sulfur trioxide (SO 3 ) is separated from the exhaust gas, while denitrification is the reduction of nitrogen oxides (NO x ). Here, NO x Nitrogen monoxide (NO) and nitrogen dioxide (NO 2 ) general term, SO x is sulfur dioxide (SO 2 ) and sulfur trioxide (SO 3 ) collectively. ...

AI Technical Summary

Problems solved by technology

The disadvantage of the above design is that in the area of ​​the upper horizontal gas inflow and bulk-discharge floor (where the sinter offgas is discharged out of the adsorber at the side reversing position), there is no contact between the sinter offgas and the activated carbon, so that Adsorbers with upper gas inflow and bulk material discharge floors must have a higher construction height than adsorbers without such a floor in order to ensure the same height of the activated carbon layer

Another disadvantage of the upper gas inflow and bulk material discharge floor is that the adsorber is more expensive to maintain, since this floor divides the adsorber into two activated carbon layers, and due to the presence of the upper gas inflow and bulk material discharge floor, the adsorber More expensive to empty and repair

In addition, the above design also has the following disadvantages: when the sintering waste gas is thoroughly mixed with ammonia, the components of the sintering waste gas such as hydrogen chloride (HCl) and sulfur oxides (SO x ) may react with ammonia gas to form solid matter

This particulate solid matter can accumulate in the side reversing positions and in the gas inflow and bulk discharge bottom plates (deposition) and cause interruptions in operation

These deposits cannot be removed during continuous operation and can only be removed at considerable cost during an interruption of operation

Another disadvantage caused by particle deposits is the increasing pressure loss, since these deposits in the area of ​​the gas inflow floor adhere to the equipment surfaces and cannot be removed during operation

This condition results in uneven gas inflow

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