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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 10247414 B1

PDFFull Text
Expired
Date of Patent:
Apr. 02, 2019

Filed:

May. 09, 2016

Coal-fired boiler exhaust gas treatment apparatus and coal-fired boiler exhaust gas treatment method

Applicant:

Mitsubishi Hitachi Power Systems, Ltd., Yokohama-shi, Kanagawa, JP;

Inventors:

Noriyuki Imada, Yokohama, JP;

Atsushi Katagawa, Yokohama, JP;

Hirotaka Yamanari, Yokohama, JP;

Assignee:

MITSUBISHI HITACHI POWER SYSTEMS, LTD., Yokohama-shi, JP;

Attorney:

Westerman, Hattori, Daniels & Adrian, LLP

Primary Examiner:

Timothy C Vanoy

Int. Cl.
CPC ...
F23J 15/02 (2006.01); F23J 15/04 (2006.01); B01D 53/64 (2006.01); B01D 53/78 (2006.01); B01D 53/18 (2006.01); B01D 53/14 (2006.01); B01D 53/86 (2006.01); B01D 53/50 (2006.01); F23J 15/00 (2006.01);
U.S. Cl.
CPC ...
F23J 15/022 (2013.01); B01D 53/1481 (2013.01); B01D 53/18 (2013.01); B01D 53/505 (2013.01); B01D 53/64 (2013.01); B01D 53/78 (2013.01); B01D 53/8625 (2013.01); F23J 15/00 (2013.01); F23J 15/04 (2013.01); B01D 2252/10 (2013.01); B01D 2257/602 (2013.01);
Abstract

An exhaust gas treatment apparatus which includes a denitration device, a dust collector, and a desulfurization device in order, respectively, in a flow path of exhaust gas discharged from a boiler, wherein a heavy-metal component removal device is provided in the exhaust gas flow path between the dust collector and the desulfurization device. This device is provided with: an absorption tower including a nozzle which sprays acidic absorption liquid on the exhaust gas, a tank which stores liquid which has absorbed a heavy metal, and a pump which supplies the nozzle with the liquid in the tank; a neutralizing tank which neutralizes the liquid drawn from the absorption tower; and a separator which separates the neutralized liquid into a solid and a liquid component. Since a small amount of heavy metal can be removed in the absorption tower, re-emission of the heavy metal by the desulfurization device is prevented.

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