Method and device for exhaust gas purification

Abstract

For the purification of exhaust gases containing nitrogen oxides combined with CO, VOC or nitrous oxide, in particular from the production of cement clinker, nitric acid, adipic acid, fertilizers and uranium trioxide, a regenerator with at least two (A,B) Regenerative thermal after-combustion system by means of which CO, VOC and nitrous oxide are thermally purified in the combustion chamber (1) at a temperature of 800 to 1000 °C and Compounds thermally reduce nitrogen oxides with an SCR catalyst (6), where the thermally purified exhaust gas is removed from the corresponding two-part regenerator (A or B) at a temperature of about 300 °C at a suitable location via the SCR The catalyst (6) is directed in a fixed flow direction and then fed back to the remaining section (A', B') of the regenerator (A or B).

Description

technical field

[0001] The invention according to the preamble of claim 1 relates to a method. The invention also relates to a device for carrying out the method and to the use of the device. Background technique

[0002] The combination of a regenerative thermal afterburner system with selective catalytic reduction (SCR) is known from DE 19905733 B4. In this method, SCR catalyst materials are each disposed on a regenerative heat exchanger material, thereby achieving thorough catalytic denitrification with high thermal efficiency when adding a reductant at the regenerator inlet. However, this method does not allow the simultaneous purification of organic components because the temperature above the catalyst is not sufficient to thermally oxidize organic contaminants.

[0003] A method for purification of exhaust gases according to the preamble of claim 1 is known from EP 472 605 B1 in which the regenerator is divided vertically into three sections ( FIG. 4 ). First, the e...

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