Patent
Process for reducing emissions in the operation of stationary internal-combustion engines
TLDR
In this paper, a two-stage process is provided in which a catalytic reduction stage (30) for the substantial removal of the nitrogen oxides, with the addition of ammonia (50), and an additional catalytic oxidation stage (40) in which the residual oxygen present in the prepurified waste gas is utilised for oxidation of hydrocarbons, carbon monoxide and excess ammonia, are connected in series.Abstract:
In order to reduce emissions of nitrogen oxides, hydrocarbons and carbon monoxide in the operation of stationary internal-combustion engines having excess air coefficients greater than 1, a two-stage process is provided in which a catalytic reduction stage (30) for the substantial removal of the nitrogen oxides, with the addition of ammonia (50), and a catalytic oxidation stage (40) in which the residual oxygen present in the prepurified waste gas is utilised for oxidation of hydrocarbons, carbon monoxide and excess ammonia, are connected in series. Any leakage of ammonia from the first catalytic stage is decreased by the following oxidation step. A reduction in the amount of the pollutant components comprising nitrogen oxides, hydrocarbons and carbon monoxide is achieved at virtually all excess air coefficients greater than 1.read more
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Cleaning exhaust gases from combustion installations
TL;DR: In this article, a dilute urea solution prepared in a reagent tank is introduced into the hot exhaust gas flow of differing concentrations and is finely sprayed in the direction of the exhaust gas flows.
Patent
Purification of combustion gases
TL;DR: In this article, an aqueous urea solution prepared in a reactant tank (20) is introduced into the hot exhaust gas stream (30) of varying concentration and finely sprayed in the direction of the exhaust gas streams.
Patent
Exhaust treatment system and method for treatment of an exhaust as stream
Magnus Nilsson,Henrik Birgersson +1 more
TL;DR: The present exhaust treatment system comprises: - a first oxidation catalyst (311 ) arranged to oxidize compounds comprising one or several of nitrogen, carbon, and hydrogen; - a second dosage device (371 ), arranged downstream of said first oxidizer, including a slip-catalyst for reduction of nitrogen oxides (NOx), and secondarily for oxidation of additive as discussed by the authors.
Patent
Catalytic appts. for reducing nitrogen oxide(s) in I.C. engine exhaust - has catalyst bed of different materials active in different temp. ranges of exhaust gas
TL;DR: In this article, the authors proposed a set of catalytic appts. for reducing nitrogen oxides in an I.C. range of the exhaust gas stream of an engine.
Patent
Catalyst for purification of gases from overstoichiometric process in combustion motors and gas turbines
TL;DR: In this article, a honeycomb form was presented for the purification of exhaust gases, in particular from internal combustion engines and gas turbines, operated under superstoichiometric conditions.
References
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Patent
Ammonia/fuel ratio control system for reducing nitrogen oxide emissions.
TL;DR: In this article, a method and apparatus for efficiently reducing the amount of nitrogen oxides contained in a combusted gas stream from an engine combustion chamber was described, where ammonium is reliably and instantaneously metered to the combusted gaseous gas stream conduit in a preselected proportion to the fuel mass flow rate and only in response to the sensed temperature of the gas stream in the reactor.
Patent
Verfahren zur Abgasreinigung
Claus Prof Dr Flockenhaus,Karl Heinrich Laue,Theo Sander,Erich Hackler,Blagoje Dr. Levkov,Daniel Grimm,Hartmut Dr Kainer,Hermann Stein +7 more
TL;DR: In this paper, a Verfahren zur Reinigung eines verschiedene Schadstoffe enthaltenden Abgases soll das Abgas zusammen with den SchadStoffen direkt einem Reduktionsreaktor zugefuhrt werden.
Patent
Process for the catalytic purification of car exhausts
Werner Dr Biffar,Klaus Dr Kratte,Rudi Dr Lehnert,Wolf Dieter Dr Mross,Klaus Starke,Matthias Dr. Schwarzmann +5 more
TL;DR: In this paper, a process for the catalytic purification of nitrogen oxide-containing exhaust gases from internal combustion engines is described, in which ammonia is added to the exhaust gases and the gas mixture is passed over a non-noble metal catalyst which may, if appropriate, be applied to a support.