Exhaust gas treatment apparatus

Patent metadata

Field	Value
Publication number	US-9283520-B2
Application number	US-201113990057-A
Country	US
Kind code	B2
Filing date	Nov 28, 2011
Priority date	Nov 29, 2010
Publication date	Mar 15, 2016
Grant date	Mar 15, 2016

Abstract

An object of the present invention is to easily reduce dust having large particle diameter that affects blocking and abrasion to prevent deposition thereof in a reactor. An exhaust gas NOx removal apparatus comprises a NOx removal rector having a catalyst layer for removing nitrogen oxides in a combustion exhaust gas; a duct structure having a stab-up point at which a flow of the exhaust gas changes from a horizontal direction to a vertical direction in an exhaust gas duct on the upstream side of the NOx removal reactor; a tilt thin plate slit in which a number of thin plates are disposed in the duct of the horizontal direction of an inlet of the stub-up point or/and in an inlet of the catalyst layer in the NOx removal reactor in a vertical direction with a slit width smaller than an opening width of the catalyst layer at a predetermined inclination angle relative to the cross-section of an exhaust gas flow path; and a dust collecting/discharging portion attached to the lower end of a tilt thin plate slit.

First claim

The invention claimed is:

1. An exhaust gas NOx removal apparatus comprising:
a NOx removal reactor having a catalyst layer for removing nitrogen oxides in a combustion exhaust gas;
a duct located upstream of the NOx removal reactor, the duct having a stub-up point at which a flow of the exhaust gas changes from a horizontal direction to a vertical direction in the duct;
a screen ( 13 A) comprising a number of thin plates which are disposed in a plane parallel to each other to form vertical slits, a width of the slits being smaller than an opening width of the catalyst layer, the screen ( 13 A) being located in a horizontal portion of the duct at an inlet side of the stub-up point, and the screen ( 13 A) being tilted at a predetermined angle relative to the cross-section of an exhaust gas flow path; and
a dust collecting/discharging portion ( 11 ) attached to the lower end of the screen ( 13 A).

2. The apparatus according to claim 1 , further comprising:
a screen ( 13 B) comprising a number of thin plates which are disposed in a plane parallel to each other to form vertical slits; a width of the slits being smaller than an opening width of the catalyst layer, the screen ( 13 B) being located in an inlet duct of the catalyst layer in the NOx removal reactor, and the screen ( 13 B) being tilted at a predetermined angle relative to the cross-section of an exhaust gas flow path; and
a dust collecting/discharging portion ( 12 ) attached to the lower end of the screen ( 13 B).

3. The apparatus according to claim 2 , wherein the opening width of the catalyst layer is 3 to 10 mm, the height of the thin plates is 30 to 100 mm, and the tilt angle of the screens ( 13 A, 13 B) is 5 to 45 degrees relative to a horizontal direction.

4. The apparatus according to claim 1 , wherein the opening width of the catalyst layer is 3 to 10 mm, the height of the thin plates is 30 to 100 mm, and the tilt angle of the screen ( 13 A) is 5 to 45 degrees relative to a horizontal direction.

5. An exhaust gas NOx removal apparatus comprising
a NOx removal reactor having a catalyst layer for removing nitrogen oxides in a combustion exhaust gas;
a duct located upstream of the NOx removal reactor, the duct having a stub-up point at which a flow of the exhaust gas changes from a horizontal direction to a vertical direction in the duct;
a screen ( 13 B) comprising a number of thin plates which are disposed in a plane parallel to each other to form vertical slits, a width of the slits being smaller than an opening width of the catalyst layer, the screen ( 13 B) being located in an inlet duct of the catalyst layer in the NOx removal reactor, and the screen ( 13 B) being tilted at a predetermined angle relative to the cross-section of an exhaust gas flow path; and
a dust collecting/discharging portion ( 12 ) attached to the lower end of the screen ( 13 B).

6. The apparatus according to claim 5 , wherein the opening width of the catalyst layer is 3 to 10 mm, the height of the thin plates is 30 to 100 mm, and the tilt angle of the screen ( 13 B) is 5 to 45 degrees relative to a horizontal direction.

Assignees

• Ishikawa Kanji
• Ishioka Masaaki
• Yashiro Katsuhiro
• Mitsubishi Hitachi Power Sys

Inventors

• Ishikawa Kanji
• Ishioka Masaaki
• Yashiro Katsuhiro

Classifications

• B03C3/017

  Combinations of electrostatic separation with other processes, not otherwise provided for · CPC title

• F23J2217/20

  by baffles · CPC title

• B01D2258/0283

  Flue gases · CPC title

• F23J15/02

  of purifiers, e.g. for removing noxious material (traps for solid residues F23J3/04) · CPC title

• B01D53/9418 Primary

  for removing nitrogen oxides by selective catalytic reduction [SCR] using a reducing agent in a lean exhaust gas · CPC title