NOx abatement system for a stationary burning system
AssigneeYara International Asa
InventorsWolfgang Kurka, Adi Zobl
Life of this patent
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Abstract
The present application relates to abatement processes and systems of nitrogen oxide (NOx) contained in exhaust gases, more in particular produced by stationary burner and combustion systems. The NOx are removed by reduction using a catalyst and a reducing agent that is introduced into the exhaust gases and being mixed therewith. The mixture is then conducted over the catalyst resulting in conversion of the NOx in environmentally neutral N2 and H2O. The present application more in particular relates to a mixing system for such a NOx abatement system to mix the exhaust gases with the reducing agent.
Claims20
A mixing system for a nitrogen oxide (NOx) abatement system, which comprises:
- a flow passage for conducting a NOx comprising exhaust gas stream in an exhaust gas stream flow direction;
- at least one injection lance positioned inside the flow passage and arranged with at least one injection point for introducing a NOx reducing agent into the exhaust gas stream;
- and
- flat deflector plates operatively associated with the at least one injection lance and positioned inside the flow passage downstream from the at least one injection point and in a transverse direction on the exhaust gas flow direction for mixing the NOx reducing agent with the exhaust gas stream by inducing turbulent flows, wherein the flat deflector plates are connected by means of at least one spacer to the at least one injection lance, wherein the at least one spacer extends in the exhaust gas flow direction from a first end attached to the at least one injection lance to a second end attached to at least one of the flat deflector plates.
A method for introducing a nitrogen oxide (NOx) reducing agent into and mixing the NOx reducing agent with an exhaust gas stream comprising NOx, the method comprising:
- conducting the exhaust gas stream comprising NOx through a flow channel;
- introducing the NOx reducing agent, through at least one injection lance, into the exhaust gas stream comprising NOx, wherein said at least one injection lance is arranged with at least one injection point for introducing the NOx reducing agent into the exhaust gas stream;
- mixing the NOx reducing agent with the exhaust gas stream comprising NOx by inducing turbulent flows with flat deflector plates operatively associated with the injection lances and positioned downstream from the injection points and transverse to the a direction of flow of the exhaust gas stream flow direction, wherein the flat deflector plates are connected by means of at least one spacer to at least one injection lance, wherein the at least one spacer extends in the direction of flow of the exhaust gas stream from a first end attached to the at least one injection lance to a second end attached to at least one of the flat deflector plates.
Dependencies are inferred from the claim text.