System, method, and apparatus for ameliorating deposits in selective catalytic reduction systems for the reduction of nitrogen oxide emissions in steam methane reformers
AssigneeIntegrated Global Services, Inc.
InventorsJefferson Landers Shelton, Mark Braithwaite, JR., Jan Albert Schutte, Morgan Watson
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Abstract
A system, method, and apparatus for ameliorating deposits in selective catalytic reduction systems for the reduction of nitrogen oxide emissions in steam methane reformers. The system includes positioning a dual stage refractory particulate (RP) filter placed in an upstream airflow from a Selective Catalytic Reduction System (SCRS). The first stage is formed of a perforated steel plate with a second stage formed of a wire mesh screen. The system may employ air cannons to clean each of the first stage and the second stages.
Claims21
An apparatus for reducing particulate blockage of a catalyst bed in a Selective Catalytic Reduction System (SCRS), comprising:
- a dual screen element having a first stage, configured to be positioned in an upstream direction in an exhaust gas flow, and a second stage positioned in a downstream direction from the first stage, the dual screen element disposed at an offset angle from a longitudinal axis of an exhaust shaft of the SCRS, the dual screen element positioned upstream in the exhaust gas flow from the catalyst bed;
- the first stage formed as a perforated steel plate having a plurality of apertures defined through a thickness of the perforated steel plate, the plurality of apertures defined in a spaced apart relation throughout a surface of the first stage, when disposed at the offset angle, the perforated steel plate having an aperture opening area at least equal to a cross-sectional area bounded by the exhaust shaft;
- and
- the second stage formed as a wire mesh screen spaced apart from the first stage by a separation distance.
A screen element for reducing particulate blockage of a catalyst bed in a refractory of a steam methane reformer, the refractory producing an exhaust gas flow in which a quantity of one or more of a refractory particulate (RP) contaminant and a stringed refractory fiber (RF) contaminant are carried in the exhaust gas flow, the exhaust gas flow carried within an exhaust shaft of the refractory having an outlet opening to the catalyst bed, the screen element comprising:
- a perforated steel plate having a plurality of apertures defined through a thickness of the perforated steel plate, the plurality of apertures defined in a spaced apart relation throughout a surface of the perforated steel plate, the screen element disposed at an offset angle from a longitudinal axis of the exhaust shaft, the screen element positioned upstream in the exhaust gas flow from the catalyst bed, the perforated steel plate having an aperture opening area at least equal to a cross-sectional area bounded by the exhaust shaft.
A screen element for reducing particulate blockage of a catalyst bed in a refractory of a steam methane reformer, the refractory producing an exhaust gas flow in which a quantity of one or more of a refractory particulate (RP) contaminant and a stringed refractory fiber (RF) contaminant are carried in the exhaust gas flow, the exhaust gas flow carried within an exhaust shaft of the refractory having an outlet opening to the catalyst bed, the screen element comprising:
- a wire mesh screen element disposed at an offset angle from a longitudinal axis of the exhaust shaft, the wire mesh screen adapted to be positioned upstream in the exhaust gas flow from the catalyst bed, the wire mesh screen element having mesh opening area at least equal to a cross-sectional area bounded by the exhaust shaft.
Dependencies are inferred from the claim text.