Babcock-hitachi Kabushiki Kaisha

Mitsubishi Hitachi Power Systems, Ltd.

Eiji Miyamoto

Yasuyoshi Kato

Koichi Yokoyama

Shigehito Takamoto

Naoki Oda

Masatoshi Fujisawa

Naomi Imada

Hiroshi Ishizaka

Jun Shimamura

Takashi Michimoto

Kazuki Kobayashi

Kouichi Yokoyama

Takeshi Hirota

Hirofumi Kikkawa

Toshio Katsube

Yoshinori Nagai

Naomi Yoshida

Masaharu Kuramoto

Masatochi Fujisawa

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

An object of the present invention is to provide a COremoval apparatus that prevents release of an amine compound of an absorbing solution from a COabsorption device. The COremoval apparatus includes a desorption columnthat heats and regenerates an amine compound aqueous solution discharged from a decarbonatormaking counterflow contact of a combustion exhaust gas and an amine compound aqueous solution; and reflux means that refluxes an amine compound aqueous solution regenerated in the desorption columnto the decarbonatorvia a cooler. A contact section that makes counterflow contact of reflux water of the desorption columnand a CO-removed combustion exhaust gas is formed in two stages, and the cooleron the downstream side of the desorption column is also formed in two stages. Reflux water from the first stage cooler is supplied to the first stage contact section, and reflux water from the second stage cooler is supplied to the second stage contact section. As a result, the reflux water from the cooleron the downstream side of the desorption columncan be efficiently used for amine removal of the decarbonator, and a concentration of an amine released from the decarbonator can be reduced.

Apparatus for removing carbon dioxide in combustion exhaust gas

An object of the present invention is to provide a method for treating an exhaust gas containing CO, that can adjust the concentration of an oxidation inhibitor in an absorbent to the concentration enough to inhibit oxidation, without measuring the concentration of the oxidation inhibitor in an alkanolamine contained in a COabsorbent. Disclosed are a method and a device for adjusting the compositional ratio of an absorbent, in which absorption and release of carbon dioxide are performed by adding an oxidation inhibitor to an alkanolamine absorbent when the sum of the concentrations of ammonia and an alkylamine in an absorber column outlet gas of a COabsorption equipment.

Method and device for treating exhaust gas containing carbon dioxide

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 particulate material removing filter for exhaust gas from a diesel engine is provided. The particulate material removing filter is formed by laminating metal laths having an oxidation catalyst layer containing a noble metal that oxidizes nitrogen oxide in exhaust gas into nitrogen dioxide. The metal laths are laminated to form a laminate in such a manner that the drawing direction of the metal lath processing differs by 90 degrees with each other.

Filter for exhaust gas from diesel engine and equipment

A particulate matter-removing filter being resistant to clogging and ash blocking, requiring no special means such as back-washing and heating combustion, and being formed of inexpensive materials; and exhaust emission controlling method and device using this. (1) A particulate-matter-containing exhaust emission controlling filter which uses as a basic unit a pair of porous corrugated sheet and a porous flat sheet that support an exhaust emission controlling catalyst, has a molding formed by laminating the porous corrugated sheets so that their ridge lines alternately cross perpendicularly, has one of side surfaces, perpendicularly crossing the corrugated sheet ridge lines, of the molding or mutually-adjoining two surfaces that are the perpendicularly-crossing side surfaces sealed, and has exhaust gas in-flow passage and out-flow passage respectively formed between porous corrugated sheets via a porous flat sheet. (2) A filter having the exhaust emission controlling catalyst that is an oxidizing catalyst for oxidizing nitrogen monoxide in an exhaust gas.

Particulate matter-containing exhaust emission controlling filter, exhaust emission controlling method and device

The catalyst structure of the present invention for purifying an exhaust gas is preferable for increasing the contact of an exhaust gas, to be treated, with a catalyst by disturbing the flow of the exhaust gas in a gas flow passage thereby obtain a highly efficient and compact apparatus for treating the exhaust gas. Such catalyst structure is produced by forming two or more catalyst elements each supporting a catalyst component on its surface and having flat plate portions and level-changing portions formed alternately therein with the angle formed between the flat plate portion and the level-changing portion being in a specific range, and then stacking the catalyst elements in a frame. A catalyst structure is also obtained by stacking a large number of the catalyst elements described above through metallic, ceramic, or glass netlike members interposed therebetween and each having a large number of perforated holes. The catalyst structure has such advantages that dust is hardly deposited between the catalyst elements, that a sufficiently high strength can be obtained even when the thickness of catalyst elements is reduced, and that the catalyst structure can be placed in an exhaust gas flue to use as an exhaust gas treating apparatus. When the exhaust gas treating apparatus is employed, an efficient exhaust gas treatment can be effected without damaging the catalyst elements while repressing the pressure loss.

Exhaust emission control catalyst element, catalyst structure, production method thereof, exhaust emission control apparatus and exhaust emission control method using the apparatus

Exhaust emission control catalyst structure

Growing community of inventors

Kure, Japan

Eiji Miyamoto