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:
Jan. 09, 2007
Filed:
Jan. 12, 2001
Hirofumi Kikkawa, Kure, JP;
Yasuyoshi Kato, Kure, JP;
Naomi Imada, Kure, JP;
Takanori Nakamoto, Kure, JP;
Shigehito Takamoto, Kure, JP;
Hirofumi Kikkawa, Kure, JP;
Yasuyoshi Kato, Kure, JP;
Naomi Imada, Kure, JP;
Takanori Nakamoto, Kure, JP;
Shigehito Takamoto, Kure, JP;
Babcock-Hitachi-Kasushiki-Kaisha, Tokyo, JP;
Abstract
Disclosed are a method and an apparatus for treating an effluent containing ammonia in which method and apparatus NO concentration in the gas at the outlet of a catalyst tower does not rise to a high level even when the NHconcentration in the effluent was reduced and the amount of hazardous substances formed is small; in the method and apparatus, an NH-containing effluent A and a carrier gas (steam C and combustion gas F) are contacted in stripping towerto transfer the NHfrom the NH-containing effluent to a gas phase, the gas containing the generated NHis heated with pre-heaterand then contacted with catalyst layerplaced in catalyst towerto decompose the NHinto nitrogen and water; and at that time, the oxygen concentration in the gas to be introduced into catalyst towerand the NO concentration in the gas discharged from catalyst towerare determined by measuring instrumentsand, respectively, and the oxygen concentration in the gas to be introduced into catalyst toweris adjusted by adjusting valveso that the NO concentration becomes within a prescribed range.