US 12,076,683 B2
System, method, and apparatus for ameliorating deposits in selective catalytic reduction systems for the reduction of nitrogen oxide emissions in steam methane reformers
Jefferson Landers Shelton, Jacksonville, AL (US); Mark Braithwaite, Jr., Richmond, VA (US); Jan Albert Schutte, Midlothian, VA (US); and Morgan Watson, Chesterfield, VA (US)
Assigned to Integrated Global Services Inc., Richmond, VA (US)
Filed by Integrated Global Services Inc., Richmond, VA (US)
Filed on Apr. 16, 2021, as Appl. No. 17/301,879.
Claims priority of provisional application 63/011,230, filed on Apr. 16, 2020.
Prior Publication US 2021/0322911 A1, Oct. 21, 2021
Int. Cl. B01D 46/10 (2006.01); B01D 39/10 (2006.01); B01D 39/12 (2006.01); B01D 46/62 (2022.01); B01D 46/69 (2022.01); B01D 46/71 (2022.01); B01D 51/00 (2006.01); B01D 53/86 (2006.01)
CPC B01D 46/62 (2022.01) [B01D 39/10 (2013.01); B01D 46/10 (2013.01); B01D 46/69 (2022.01); B01D 46/71 (2022.01); B01D 51/00 (2013.01); B01D 53/8631 (2013.01); B01D 2257/404 (2013.01); B01D 2267/40 (2013.01)] 23 Claims
OG exemplary drawing
 
1. An apparatus for reducing particulate blockage of a catalyst bed in a coal fired refractory, comprising:
a dual element screen having a first stage and a second stage disposed within a frame at a desired separation distance between the first stage and the second stage;
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, the perforated steel plate having a first open area ratio (OAR) between the plurality of apertures and a surface of the perforated steel plate of at least 30%; and
the second stage formed as a wire mesh screen having a second OAR between a pore and a surface area of the wire mesh screen of at least 30%.