Babcock-Hitachi Kabushiki Kaisha

Mitsubishi Hitachi Power Systems, Ltd.

Hitachi, Ltd.

Shigehito Takamoto

Hirofumi Kikkawa

Hiroyuki Kaku

Takanori Nakamoto

Fumito Nakajima

Hiroshi Ishizaka

Shigeru Nozawa

Masakatsu Nishimura

Naoki Oda

Eiji Miyamoto

Koichi Yokoyama

Toshio Katsube

Yasuyuki Nishimura

Jun Shimamura

Nobuyasu Meguri

Naoki Fujiwara

Masaharu Kuramoto

Koya Sakamoto

Yutaka Yoneda

Yasuyoshi Kato

Hisao Yamashita

Hiroshi Kuroda

Yoshijiro Arikawa

Atsushi Morihara

Naomi Imada

Tomohiko Miyamoto

Shuntaro Koyama

Jinichi Tomuro

Sadao Takahashi

Mutsuo Yamada

Atsushi Katagawa

Taiji Kamiguchi

Hirotoshi Tanimoto

Kazunori Shoji

Yoshinori Ohtani

Eiji Kida

Masayasu Murata

Genroku Nakao

Akio Ueda

Kunikatsu Yoshida

Masayuki Yamamoto

Mitsuharu Kon

Hiroshi Ishisaka

Miyamoto Eiji

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

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

Disclosed are a method and an apparatus for treating an effluent containing ammonia in which method and apparatus NO concentration in the gas at the outlet of a catalyst tower does not rise to a high level even when the NHconcentration in the effluent was reduced and the amount of hazardous substances formed is small; in the method and apparatus, an NH-containing effluent A and a carrier gas (steam C and combustion gas F) are contacted in stripping towerto transfer the NHfrom the NH-containing effluent to a gas phase, the gas containing the generated NHis heated with pre-heaterand then contacted with catalyst layerplaced in catalyst towerto decompose the NHinto nitrogen and water; and at that time, the oxygen concentration in the gas to be introduced into catalyst towerand the NO concentration in the gas discharged from catalyst towerare determined by measuring instrumentsand, respectively, and the oxygen concentration in the gas to be introduced into catalyst toweris adjusted by adjusting valveso that the NO concentration becomes within a prescribed range.

Method for treating amonia-containing effluent water

A wet-type flue gas desulfurization method and plant making use of a solid desulfurizing agent in which exhaust gas exhausted from a combustion apparatus such as a boiler is brought into contact with absorbing liquid to absorb sulfur oxide from the exhaust gas into the absorbing liquid followed by neutralization of the absorbing liquid containing the sulfur oxide thus absorbed. The solid desulfurizing agent is selectively retained in an absorbing liquid neutralizing zone and the absorbing liquid, containing water as a main constituent and solid products formed from the absorbed sulfur oxide, is selectively removed from the neutralizing zone. In the neutralizing zone the upward flow of the absorbing liquid, optionally augmented by an upward flow of air or water, forms a fluidized bed of limestone particles, thereby preventing coating of the limestone by gypsum and thereby retaining reactivity of limestone. According to the present invention, coexistence of Al and F in the absorbing liquid seldom deteriorates the desulfurizing performance. Further, it is possible to reduce power and cost required to grind limestone and to achieve a higher desulfurizing performance.

Wet-type flue gas desulfurization plant and method making use of a solid

Wet-type flue gas desulfurization plant

CO is recovered from a CO-containing gas by contacting a CO-containing gas with a non-aqueous CO-absorbing solution comprising 3 to 6 moles/l of hexametaphosphateamine, 1 to 4 moles/l of cuprous chloride, 0.1 to 1% by weight of water and an organic solvent, thereby absorbing CO into the CO-absorbing solution from the CO-containing gas, and then atomizing the CO-absorbed solution, thereby stripping CO from the CO-absorbed solution and obtaining a CO gas, while recycling the CO-freed absorbing solution to the absorption of CO from the CO-containing gas with remarkable reduction in the corrosion rate on apparatus materials without impairing the CO absorption, and use of a two-fluid, simultaneous atomizing means for atomizing the CO-absorbed solution together with the vapor of the organic solvent can improve the CO stripping rate, and reduce the CO recovery cost.

Process for absorbing CO

The present invention provides a desulfurizing agent comprising a porous oxide carrier, at least one of molybdenum oxide and tungsten oxide as a first component, supported on the carrier, and at least one of manganese oxide, cobalt oxide and nickel oxide as a second component, supported mainly on the surface of the first component. In a coal gasification system using the present desulfurizing agent and a power generation system using the purified gas therefrom, a reduction column for converting a portion of sulfur dioxide in the regenerated gas to hydrogen sulfide as a pretreatment means to a Claus reaction column can be eliminated when the desulfurizing agent is regenerated. Furthermore, in the present invention a desulfurizing agent capable of reacting with hydrogen sulfide to form a solid sulfur compound at a high temperature is supplied to a gasification furnace and the resulting sulfur compound is withdrawn from the gasification furnace as molten slag together with ashes of fine coal powder, where desulfurization can be attained without a Claus reaction column and without a reduction column. Such desulfurization is likewise applicable to a coal gasification system and a power generation system based on the coal gasification.

Desulfurizing agent and process for treating hydrogen sulfide containing

A fluidized bed combustor wherein a combustion chamber and a regeneration chamber are both contained in a single hollow body is provided. These two chambers are formed by vertically partitioning the body by a partition wall, which has an upper opening and a lower one, and also each have a perforated plate at the bottom part thereof on which a heat transfer medium containing a desulfurizing agent is placed and fluidized. The desulfurizing agent is transferred from the combustion chamber through the lower opening to the regeneration chamber and circulated by overflow through the upper opening again to the combustion chamber. Various modifications of the above-mentioned fundamental embodiment are proposed. Combustion and desulfurization are automatically and effectively carried out in a single apparatus to give a high percentage desulfurization, make the apparatus compact, and reduce the initial cost and the running cost thereof.

Fluidized bed combustor and a method of operating same

A process for producing an oxygen-containing organic compound by oxidizing olefins under milder conditions is provided, which process comprises oxidizing an olefin activated by its complex formation, in the presence of a platinum group metal complex capable of forming an olefin complex through coordination of the platinum group metal with said olefin, and also in the presence of water, and further oxidizing and regenerating the resulting reduced platinum group metal complex with oxygen coordinated with a transition metal and activated thereby.

Process for producing an oxygen-containing organic compound from olefins

A coal-water slurry producing system comprises: a continuous wet-type ball mill for grinding the coal with the addition of water and additives thereto to obtain coal-water slurry, supplying device for supplying the coal-water slurry discharged from the ball mill to a filtering apparatus, for filtering the supplied coal-water slurry to remove coal particles of a predetermined particle size or above, delivery device for delivering the filtered coal-water slurry containing coal particles of the predetermined particle size or below to a slurry storage tank, and a combustion apparatus. The coal-water slurry producing system further comprises a screen apparatus disposed at an exit of the ball mill to remove coarse coal particles contained in the coal-water slurry, and recovery device for recovering the removed coarse coal particles at an entrance of the ball mill.

Coal-water slurry producing system

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Kure, Japan

Shigehito Takamoto