Mitsubishi Hitachi Power Systems, Ltd.

Babcock-hitachi Kabushiki Kaisha

Babcock-hitachi K.k.

Mitsubishi Power, Ltd.

Jun Shimamura

Toshio Katsube

Hirofumi Kikkawa

Shigehito Takamoto

Hisayuki Orita

Eiji Miyamoto

Naoki Oda

Kouichi Yokoyama

Koichi Yokoyama

Masaharu Kuramoto

Hideaki Higashi

Takanori Nakamoto

Hiroshi Ishizaka

Nobuyuki Hokari

Atsushi Katagawa

Nobuyoshi Mishima

Masaaki Mukaide

Kazuki Kobayashi

Hiroyuki Nosaka

Takayuki Saitou

Noriko Yoshida

Yoshinori Taguchi

Shinya Ii

Noriaki Taniguchi

Yoshihiro Kidera

Ryota Ochiai

Miyamoto Eiji

Hiromichi Shimazu

Nobuo Yamane

Tsuyoshi Okawa

Takayuki Saito

Miyamoto Eiji,

A method for decomposing a nitroso compound, comprising: adding an aqueous solution containing hydrogen halide to a liquid to be treated that contains the nitroso compound in such a manner that the hydrogen halide is present in an amount of 2 mol or more and 20 mol or less per mol of a nitroso group in the nitroso compound; and subsequently heating the resulting liquid to be treated at a temperature of not lower that 75&#xb0; C. and not higher than a boiling point of water under ordinary pressure, thereby an amines are recovered.

Method and device for treating nitroso compound

A carbon dioxide (CO) chemical absorption system comprising: a COabsorption column for separating COfrom combustion exhaust gas by absorbing the COin the combustion exhaust gas with a COabsorbing liquid mainly composed of an aqueous alkanolamine solution; a regeneration column for regenerating the COabsorbing liquid by desorbing COgas from the COabsorbing liquid that has absorbed CO; a condenser for condensing water vapor entrained in the desorbed COgas discharged from the top of the regeneration column, thereby obtaining reflux water; a pipe for returning all or part of the reflux water obtained by the condenser to the top of the regeneration column, and dispersing the reflux water in the regeneration column; a collection plate for collecting the reflux water dispersed in an upper portion of a packed bed in the regeneration column; a pipe for sending the regenerated COabsorbing liquid from the bottom of the regeneration column to the top of the absorption column; and a pipe for joining the reflux water collected by the collection plate into the pipe for sending the regenerated COabsorbing liquid.

System for chemically absorbing carbon dioxide in combustion exhaust gas

An exhaust gas treatment system comprising: a COchemical absorption equipment comprising an absorption column which absorbs carbon dioxide (CO) in a combustion exhaust gas discharged from a combustion device with the use of an absorbing solution comprising an amine compound as a main component and a regeneration column which regenerates the absorbing solution by desorbing COfrom the absorbing solution which absorbed CO; a flash tank which depressurizes the absorbing solution withdrawn from a lower part of the regeneration column to flash-evaporate the absorbing solution; a vapor recompression equipment which compresses the vapor generated by the flash tank; a temperature control device which adjusts the vapor compressed by the vapor recompression equipment to be within a predetermined temperature; and a piping for feeding the vapor adjusted to the predetermined temperature by the temperature control device to the regeneration column.

Carbon dioxide chemical absorption system installed with vapor recompression equipment

A combustion exhaust gas treatment system comprising: a heat exchanger (A) for recovering heat contained in the combustion exhaust gas into heat medium, an absorption column for obtaining COremoved gas by absorbing COin the combustion exhaust gas into absorbent, a heat exchanger (B) for applying heat recovered by heat medium to the COabsorbed absorbent, a desorption column for desorbing the absorbent by removing COfrom the COabsorbed absorbent, a flash tank for flash vaporizing the desorbed absorbent and a heat exchanger (E) for transferring heat from the desorbed absorbent to the COabsorbed absorbent, wherein the COabsorbed absorbent can be supplied from the absorption column to the desorption column via the heat exchanger (E) and the heat exchanger (B) in this order, and the desorbed absorbent can be supplied from the desorption column to the absorption column via the flash tank and the heat exchanger (E) in this order.

Combustion exhaust gas treatment system and method of treating combustion exhaust gas

The COcapture system by chemical absorption for removing COfrom a combustion exhaust gas by a solvent, comprising: an absorber for absorbing COby a solvent, a regenerator for heating a rich solvent absorbed COthereby releasing CO, a gas exhaust system for discharging gas from the regenerator, a gas compressor installed in the gas exhaust system, a heat exchanger disposed downstream of the gas compressor for exchanging heat between compressed gas and rich solvent to be supplied to the regenerator, a gas-liquid separator disposed downstream of the heat exchanger for separating gas from condensed water, a condensed water supply system for supplying condensed water from the gas-liquid separator to the regenerator, another gas exhaust system for discharging gas containing high-concentration COfrom the gas-liquid separator, and a compressor disposed downstream of the gas-liquid separator in the another gas exhaust system for pressurizing the gas containing high-concentration CO.

[object Object]

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

A system is provided that prevents inhibition of adsorption of Hg and other heavy metals by activated carbon or other heavy metal adsorbent due to prior adsorption of sulfur trioxide (SO) in an exhaust gas containing SO. As it has been found that while SOis adsorbed, the adsorption of SOprecedes the adsorption of Hg and other heavy metals onto activated carbon, a basic substance injection system is disposed along an exhaust gas flow channel at an upstream side of an activated carbon injection system, thereby attaining effective removal of Hg and other heavy metals from the exhaust gas by adsorption thereof onto surface pores of the activated carbon. The SOconcentration after removal by basic substance conversion is computed from the SOconcentration before removal, and the activated carbon injection rate can be controlled based on the concentration after removal.

Exhaust gas purifying method and apparatus

Growing community of inventors

Hiroshima, Japan

Jun Shimamura