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.:
Date of Patent:
Sep. 24, 2002
Filed:
May. 26, 1999
Nobuhide Kato, Ama-gun, JP;
Hiroshi Kurachi, Nagoya, JP;
NGK Insulators, Ltd., , JP;
Abstract
An NOx removal system has a combustion apparatus for applying energy to a load based on a predetermined combustion control process, an NOx remover for reacting NOx emitted from the combustion apparatus with NH to produce N and H O, an NH and/or urea introducing apparatus connected upstream of the NOx remover, for introducing NH and/or urea into a gas passage extending from the combustion apparatus to the NOx remover, and sensor, which is also sensitive connected downstream of the NOx remover, for generating a detected signal based on NH and NOx contained in a gas discharged from the NOx remover. A controller controls a rate at which NH and/or urea is introduced into the gas passage by the NH and/or urea introducing apparatus while repeatedly increasing and reducing the rate, in response to the detected signal generated by the NOx sensor. The NOx removal system, which employs NH and/or urea as a reducing agent, is capable of accurately controlling the rate at which NH and/or urea is introduced into the gas passage through a simple arrangement, and minimizing the discharge of NH and NOx.