Babcock-Hitachi Kabushiki Kaisha

Masaharu Kuramoto

Shigehito Takamoto

Toshio Katsube

Jun Shimamura

Naoki Oda

Hirofumi Kikkawa

Eiji Miyamoto

Koichi Yokoyama

An object of the present invention is to solve these problems and to provide a exhaust gas treatment system which prevents formation of deposits in a main duct and a flue, on and after the point where the exhaust gases converge, after the removal of COand reduces labor required for maintenance such as cleaning, and thus enabling a long-term operation. Disclosed is an exhaust gas treatment system equipped with a carbon dioxide removal device, comprising a main ductthrough which an exhaust gas, after treating an exhaust gas from a boilerby a wet desulfurization device, passes; a diverging ductconfigured to diverge some of an exhaust gas flow from the main duct; an COremoval deviceconfigured to absorb and remove carbon dioxide (CO) in the diverged exhaust gas by an amine absorbent; and a return ductconfigured to converge the exhaust gas, from which COhas been removed by the COremoval device, with an exhaust gas that has not yet been diverged, wherein the return duct, before the point where the exhaust gases converge, is provided with heating meansconfigured to vaporize mist of the amine absorbent in the exhaust gas after convergence.

Exhaust gas treatment system equipped with carbon dioxide removal device

A method of recovering carbon dioxide, includes bringing gas to be processed containing carbon dioxide (CO) and oxygen into contact with the CO-absorbing solution in an absorption column to form a CO-rich solution; circulating the solution in a regeneration column to thermally release and recover COand recirculating the absorbing solution as a CO-poor solution inside the absorption column; and performing heat exchange between the solution being delivered from the absorption column to the regeneration column and the solution recirculated from the regeneration column to the absorption column, wherein an alkanolamine aqueous solution containing a silicone oil and/or an organosulfur compound is added to the solution inside the absorption column and/or the solution recirculated from the regeneration column to the absorption column to adjust the composition of the absorbing solution inside the absorption column.

Carbon dioxide-absorbing solution and method of recovering carbon dioxide

Growing community of inventors

Kure, Japan

Masaharu Kuramoto