Babcock-hitachi Kabushiki Kaisha

Mitsubishi Hitachi Power Systems, Ltd.

Mitsubishi Power, Ltd.

Kazuki Kobayashi

Hiroshi Ishizaka

Yasuyoshi Kato

Hirofumi Kikkawa

Naomi Imada

Eiji Miyamoto

Hiroyuki Nosaka

Takeshi Hirota

Hiroshi Takezaki

Jun Shimamura

Takashi Michimoto

Masatoshi Fujisawa

Hideaki Higashi

Masatochi Fujisawa

Goki Sasaki

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

After adjusting an exhaust gas temperature at an exit of a heat recovery unit () of an exhaust gas treating apparatus to not more than a dew point temperature of sulfur trioxide (SO), a heavy metal adsorbent is supplied from a heavy metal adsorbent supply unit () disposed in an exhaust gas at an entrance of a precipitator () or an intermediate position within the precipitator (), and the exhaust gas containing the heavy metal adsorbent is supplied into the precipitator (). Preferably at this stage, the heavy metal adsorbent is supplied into the exhaust gas at the entrance of the precipitator () 0.1 seconds after the exhaust gas temperature at the exit of the heat recovery unit () has been adjusted to not more than the dew point temperature of SO. Further preferably, in order to prevent acid corrosion of equipment, the heavy metal adsorbent is supplied after spraying an alkali into the exhaust gas at the entrance or exit of the heat recovery unit () and adjusting the exhaust gas temperature at the exit of the heat recovery unit to not more than the dew point temperature of SO. Accordingly, even when coal with a high sulfur content is used as fuel, heavy metals in the exhaust gas can be removed effectively.

Exhaust gas treating method and apparatus

A method and apparatus for treating an exhaust gas comprising heavy metals, wherein the apparatus comprises a heat recovery unit, recovering exhaust gas heat at an exit of the air preheater; a precipitator, collecting soot/dust contained in an exhaust gas at an exit of the heat recovery unit; a wet flue gas desulfurizer, removing sulfur oxides contained in the exhaust gas at the exit of the precipitator; and a reheater, heating the exhaust gas at the exit of the wet flue gas desulfurizer. Each of the heat recovery unit and the reheater has a heat exchanger tube, and a circulation line is disposed to connect the heat exchanger tubes. A sulfur trioxide (SO) removing agent is supplied to the upstream side of the heat recovery unit, and the temperature of the exhaust gas at the exit of the heat recovery unit is adjusted to not more than a dew point of sulfur trioxide.

Method and apparatus for treating discharge gas

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

Growing community of inventors

Hiroshima, Japan

Kazuki Kobayashi