US 2026/0216648 A1 · REDUCING THE CONTENT OF NOX AND N2O IN THE OFFGAS FROM FIRING PLANTS OPERATED WITH NH3 FOR CATALYTIC DECOMPOSITION OF NH3

Abstract

The invention relates to reduction of the content of NOX and N2O in the offgas (flue gas) of an NH3-operated firing system integrated into a system for catalytic decomposition of NH3 to N2 and H2. For this purpose, the firing system preferably comprises a combustion device in which NH3 is combusted to generate heat of combustion, and an NH3 decomposition device which is in heat exchange with the combustion device and in which NH3 is decomposed catalytically to N2 and H2. The heat required for the catalytic decomposition of NH3 in the NH3 decomposition device is provided by the combustion of NH3 in the combustion device. The combustion device preferably comprises at least a burner and a combustion chamber. The firing system is preferably configured analogously to a primary reformer.

Claims25

Dependent claims

A method of reducing the content of NOX and N2O in the offgas of an NH3-operated firing system, the process comprising the following steps:

(a) combusting NH3 to operate the firing system, preferably comprising a combustion device and an NH3 decomposition device, for catalytic decomposition of NH3 to N2 and H2, producing an offgas which comprises N2, H2O, NOX and N2O and which leaves the firing system;
(b) optionally and preferably cooling the offgas in at least one heat exchanger disposed downstream of the firing system in flow direction of the offgas;
(c) transferring the optionally cooled offgas into an offgas treatment system;
(d) reducing the N2O content in the offgas by;
(d1) decomposing N2O over an N2O decomposition catalyst, and/or
(d2) chemically reducing N2O with reducing agent over an N2O reduction catalyst;
(e) reducing the NOX content in the offgas by chemical reduction of NOX with reducing agent over an NOX reduction catalyst;
and
(f) optionally and preferably cooling the offgas in at least one heat exchanger disposed downstream of the offgas treatment system in flow direction of the offgas.

6 more elements

Dependencies are inferred from the claim text.

Reducing the content of nox and n2o in the offgas from firing plants operated with nh3 for catalytic decomposition of nh3

Life of this patent

Reducing the content of nox and n2o in the offgas from firing plants operated with nh3 for catalytic decomposition of nh3

Life of this patent

Abstract

Claims25