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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 10232308 B1

PDFFull Text
Date of Patent:
Mar. 19, 2019

Filed:

Apr. 01, 2016

Method and device for wet flue-gas desulfurization

Applicant:

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

Inventors:

Wakako Shimohira, Yokohama, JP;

Hirofumi Kikkawa, Yokohama, JP;

Atsushi Katagawa, 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 ...
B01D 53/14 (2006.01); B01D 53/18 (2006.01); B01D 53/50 (2006.01); B01D 53/64 (2006.01); B03D 1/02 (2006.01); B03D 1/08 (2006.01); B01D 53/78 (2006.01); B03D 1/14 (2006.01); B03D 1/24 (2006.01); C02F 1/24 (2006.01); C02F 1/28 (2006.01);
U.S. Cl.
CPC ...
B01D 53/1481 (2013.01); B01D 53/14 (2013.01); B01D 53/1412 (2013.01); B01D 53/1418 (2013.01); B01D 53/185 (2013.01); B01D 53/50 (2013.01); B01D 53/504 (2013.01); B01D 53/64 (2013.01); B01D 53/78 (2013.01); B03D 1/02 (2013.01); B03D 1/028 (2013.01); B03D 1/08 (2013.01); B03D 1/14 (2013.01); B03D 1/24 (2013.01); C02F 1/24 (2013.01); C02F 1/28 (2013.01); B01D 2251/402 (2013.01); B01D 2251/404 (2013.01);
Abstract

In order to heighten the recovery of activated carbon by separation in a flotation device and stably inhibit mercury from being re-emitted in a desulfurization/absorption tower and from coming into gypsum to be recovered, a method is provided, the method comprising: adding activated carbon to an absorption liquid to be sprayed into the desulfurization/absorption tower to thereby remove mercury components from the flue gas simultaneously with desulfurization of the flue gas; sending the absorption liquid used for the desulfurization to the flotation device to thereby form a foam bubble layer; reducing the drainage volume so that the physical properties of the bubble layer are within given ranges, in such an amount that the concentration of chlorine ions in the absorption liquid does not exceed a given value; and simultaneously adding Ca and/or Mg ions and a frothing agent to the absorption liquid.

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