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US 2026/0264016 A1Published application
In-situ regeneration of filter medium for improving catalytic efficiency
AssigneeW. L. Gore & Associates, Inc.
InventorsMonaca A. McNall, Jeffrey A. Kolde, Tarun K. Poddar
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Abstract
Various aspects of the present disclosure are directed towards apparatuses, systems, and methods of regenerating a filter medium for use in cleaning flue gas stream. The method may include increasing NOx removal efficiency of the filter medium by increasing the upstream NO2 concentration, wherein increasing the upstream NO2 concentration includes oxidizing NO to form additional NO2 outside the flue gas stream, and introducing the additional NO2 into the flue gas stream.
Claims33
A method comprising:
- providing at least one filter medium;
- wherein the at least one filter medium comprises:
- at least one catalyst material;
- and
- ammonium bisulfate (ABS) deposits, ammonium sulfate (AS) deposits, or any combination thereof;
- flowing a flue gas stream transverse to a cross-section of the at least one filter medium, such that the flue gas stream passes through the cross section of the at least one filter medium,
- wherein the flue gas stream comprises:
- NOx compounds comprising:
- Nitric Oxide (NO), and
- Nitrogen Dioxide (NO2);
- and
- increasing NOx removal efficiency of the at least one filter medium;
- wherein the increasing of the NOx removal efficiency of the at least one filter medium comprises increasing an upstream NO2 concentration to a range from 2% to 99% of a total concentration of the upstream NOx compounds,
- wherein the increasing the upstream NO2 concentration to a range from 2% to 99% of a total concentration of the upstream NOx compounds comprises:
- providing an NO stream;
- oxidizing the NO stream with at least one oxidizing agent to form additional NO2, and
- introducing the additional NO2 into the flue gas stream;
- and optionally wherein the NO stream is oxidized prior to being introduced into the flue gas stream.
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A method comprising:
- providing at least one filter medium
- wherein the at least one filter medium comprises at least one catalyst material;
- flowing a flue gas stream transverse to a cross-section of the at least one filter medium, such that the flue gas stream passes through the cross section of the at least one filter medium from an upstream side of the filter medium to a downstream side of the filter medium;
- wherein the flue gas stream comprises:
- NOx compounds comprising:
- Nitric Oxide (NO), and
- Nitrogen Dioxide (NO2);
- Sulfur Dioxide (SO2);
- and
- Ammonia (NH3);
- maintaining a NOx removal efficiency of the at least one filter medium in an amount of at least 50% of an initial NOx removal efficiency of the at least one filter medium by:
- providing an NO2 concentration, measured from the upstream side of the filter medium, in a range from 2% to 99% of a total concentration of the NOx compounds, wherein providing the NO2 concentration, measured from the upstream side of the filter medium, in a range from 2% to 99% of a total concentration of the NOx compounds comprises:
- providing an NO stream;
- oxidizing the NO stream with at least one oxidizing agent to form additional NO2, and
- introducing the additional NO2 into the flue gas stream;
- and
- controlling the NO2 concentration, measured from the downstream side of the filter medium, to a range of from 0.0001% to 0.5% of the concentration of the flue gas stream.
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A system comprising:
- at least one filter medium,
- wherein the at least one filter medium comprises:
- an upstream side;
- a downstream side;
- at least one catalyst material;
- and
- ammonium bisulfate (ABS) deposits, ammonium sulfate (AS) deposits, or any combination thereof;
- at least one filter bag,
- wherein the at least one filter medium is disposed within the at least one filter bag;
- and
- at least one filter bag housing,
- wherein the at least one filter bag is disposed within the at least one filter bag housing;
- wherein the at least one filter bag housing is configured to receive a flow of a flue gas stream transverse to a cross-section of the at least one filter medium, such that the flue gas stream passes through the cross section of the at least one filter medium from the upstream side of the at least one filter medium to the downstream side of the at least one filter medium,
- wherein the flue gas stream comprises:
- NOx compounds comprising:
- Nitric Oxide (NO), and
- Nitrogen Dioxide (NO2);
- and
- wherein the system is configured to increase an NOx removal efficiency of the at least one filter medium when an upstream NO2 concentration is increased to a range from 2% to 99% of a total concentration of the upstream NOx compounds,
- wherein increasing the upstream NO2 concentration to a range from 2% to 99% of a total concentration of the upstream NOx compounds comprises:
- providing an NO stream;
- oxidizing the NO stream with at least one oxidizing agent to form additional NO2, and
- introducing the additional NO2 into the flue gas stream.
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Dependencies are inferred from the claim text.