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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 9802155 B1

PDFFull Text
Date of Patent:
Oct. 31, 2017

Filed:

Jul. 18, 2014

Method for purifying exhaust gas

Applicant:

Hitachi Zosen Corporation, Osaka-shi, JP;

Inventors:

Tsugumi Nishi, Osaka, JP;

Naoe Hino, Osaka, JP;

Seigo Yamamoto, Osaka, JP;

Susumu Hikazudani, Osaka, JP;

Assignee:

Hitachi Zosen Corporation, Osaka-shi, JP;

Attorney:

Locke Lord LLP

Primary Examiner:

Timothy Vanoy

Int. Cl.
CPC ...
B01D 53/56 (2006.01); B01D 53/94 (2006.01); F01N 3/20 (2006.01); B01J 29/46 (2006.01); B01D 53/86 (2006.01); F01N 3/10 (2006.01); F01N 13/00 (2010.01); F01N 3/04 (2006.01); F01N 3/00 (2006.01);
U.S. Cl.
CPC ...
B01D 53/9418 (2013.01); B01D 53/8631 (2013.01); B01J 29/46 (2013.01); F01N 3/04 (2013.01); F01N 3/108 (2013.01); F01N 3/206 (2013.01); F01N 3/2066 (2013.01); F01N 13/004 (2013.01); B01D 2251/21 (2013.01); B01D 2255/20746 (2013.01); B01D 2255/504 (2013.01); B01D 2258/012 (2013.01); B01D 2259/4566 (2013.01); F01N 3/005 (2013.01); F01N 2570/14 (2013.01); F01N 2590/02 (2013.01); F01N 2610/03 (2013.01); F01N 2610/06 (2013.01); F01N 2610/14 (2013.01); Y02T 10/24 (2013.01);
Abstract

The present invention provide a method for purifying exhaust gas in which nitrogen oxides (NOx) gas is removed from a combustion exhaust gas. The method for purifying exhaust gas according to the invention is characterized in that water vapor is further added to raw exhaust gas to be processed to increase the water vapor concentration in the exhaust gas and the resulting moisture-adjusted exhaust gas is introduced into a denitration catalyst layer. The water vapor concentration in the moisture-adjusted exhaust gas is preferably 22.0% by volume or less in the total of the water vapor originally contained in the raw exhaust gas and the added water vapor.

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