Mitsubishi Jukogyo Kabushiki Kaisha

Mitsubishi Heavy Industries Limited

Ohji Rubber & Chemicals Co., Ltd.

Other

Tohoku Electric Power Company, Inc.

Naohiko Ukawa

Susumu Okino

Toru Takashina

Atsushi Tatani

Kiyoshi Okazoe

Taku Shimizu

Kazuaki Kimura

Masakazu Onizuka

Eiji Ochi

Masao Hino

Kenji Inoue

Takashi Haruki

Naoharu Shinoda

Koichiro Iwashita

Shigeo Hasegawa

Masumi Atsukawa

Tsumoru Nakamura

Kouichiro Iwashita

Hiroshi Tanaka

Kazuto Kobayashi

Masaki Iijima

Tsuyoshi Oishi

Wataru Matsubara

Yukio Kita

Toyoshi Nakagawa

Takehiko Moriya

Masato Kaneko

Shinichiro Kotake

Makiichi Ishihara

Yoshihiro Shiraishi

Yoshihisa Saito

Takakazu Sunada

Kousuke Yamashita

Junji Ozaki

Kaname Kaneshige

Yasuyuki Ogushi

Takashi Kamijo

Hiromitsu Nagayasu

Kozo Iida

Toru Seto

Toshikuni Sera

Hiroshi Suzumura

Hiroshi Fujita

Koosoo Tao

Susumu Kono

Tsuyoshi Ohishi

Kenji Iwasaki

Naoyuki Takahashi

Michio Oshima

Atsushi Yoshioka

Ryuichiro Ebara

Toshiaki Kinomoto

Tokuma Arai

Kazuhiro Matsumoto

Shoichi Onishi

Sadaichi Shigeta

Yoshimitsu Kawanishi

Heiji Tanaka

Kouji Ikeda

Masaru Sakamoto

Kazumitsu Suzuki

Hideo Nakamoto

Yasuo Nishimura

Tamotsu Yamada

Kyozo Suyama

Masanori Tabata

Nobuo Kojima

Masaharu Yoshimi

An air pollution control apparatus includes: a denitration unit that removes nitrogen oxides from a flue gas; a desulfurization unit that is installed on a gas flow downstream side of the denitration unit to remove the sulfur oxides in a flue gasB; a finish denitration and desulfurization unit that is installed on the gas flow downstream side of the desulfurization unit to perform finish denitration and desulfurization of NOand SO; and a carbon dioxide recovery unit that is installed on the gas flow downstream side of the finish denitration and desulfurization unit to remove and recover the carbon dioxide in a flue gas.

Air pollution control apparatus

An air pollution control system includes a desulfurization apparatusthat reduces sulfur oxide contained in flue gassupplied from a boiler; and a COrecovery apparatusincluding a COabsorberthat reduces COcontained in flue gasthat has been desulfurized by the desulfurization apparatus, with the aid of an amine absorbent and an absorbent regeneratorthat regenerates the amine absorbent. Partof desulfurized flue gascontaining SOx is supplied to treated flue gas, from which COhas been reduced and which is discharged from a top portion of the COabsorber, so that remaining mist amine accompanying the treated flue gasis neutralized to amine sulfate or amine sulfite.

Air pollution control system and air pollution control method

In a flue gas treating system, an absorption tower (), a reheating section () and a fan () are arranged in line on a vertical axis so as to function as at least a part of a stack for emitting the treated flue gas into the atmosphere. Moreover, in a flue gas treating process, the amount of ammonia injected in the denitration step (a denitrator ()) and/or the amount of ammonia at a point downstream of the denitration step are determined so as to be on such an excessive level that ammonia or ammonium salt will remain in the flue gas introduced into the desulfurization step (absorption tower ()). Thus, the size and cost of the equipment can be reduced.

Flue gas treating system and process

Five combustion exhaust gas treatment systems capable of removing dust and selenium (Se) in combustion exhaust gas and making harmless are proposed: (1) combustion exhaust gas is cooled to 350&deg; C. or less, dust is separated, Se is transformed into insoluble compound, and Se is separated; (2) combustion exhaust gas is cooled to 350&deg; C. or less, dust is separated, Se elution preventive agent is added, and dust is formed into scale; (3) dust in combustion exhaust gas is collected by dust collector, dust is formed into slurry by making use of part of circulation liquid in desulfurization apparatus, and tetravalent Se in dust slurry is transformed into insoluble compound, which is separated into solid and liquid; (4) dust is separated from combustion exhaust gas by dust collector, and it is heated to gasify Se, and is led into desulfurization apparatus, etc., and formed into slurry, and Se is made into insoluble compound; and (5) a treating agent for making tetravalent Se insoluble is added to part of circulation liquid in desulfurization apparatus, and it is sprayed into combustion exhaust gas to make Se insoluble.

Combustion exhaust gas treatment system

A method and system for desulfurizing flue gas in which desulfurization is effected by bringing absorbent slurry containing limestone into contact with flue gas. The method classifies absorbent slurry extracted from a desulfurization absorber, returns a fine-side fluid to the desulfurization absorber, and sends a coarse-side fluid to a solid-liquid separator. Supplied limestone powder is mixed to yield limestone slurry by a solid-liquid mixer, and the limestone slurry is classified, sending the small-particle fluid component thereof to the desulfurization absorber, and sending the large-particle fluid component thereof to a limestone fine grinder. And, limestone contained in the large-particle fluid component is finely ground by the limestone fine grinder and the finely ground limestone is sent to the desulfurization absorber. According to the desulfurization method and system, the concentration of limestone in the desulfurization absorber is increased while the concentration of residual limestone in by-product gypsum is kept low, whereby the desulfurization performance of the absorber can be enhanced, and the operation power for the whole system can be decreased.

Exhaust gas desulfurizing method and system therefor

This invention relates to equipment for treating the aforesaid waste plastics directly with supercritical water, and an object thereof is to provide a method for the anticorrosive treatment of waste plastics treating equipment which makes it possible to use inexpensive stainless steel. Waste plastics treating equipment made of stainless steel is charged with a predetermined amount of an aqueous solution containing at least one alkali metal salt, and this aqueous solution is deaerated until its dissolved oxygen content is reduced to 0.5 mg/L or less. After the temperature and pressure of the equipment are raised until supercritical conditions are established, these temperature and pressure are maintained for a predetermined period of time.

Method for the anticorrosive treatment of waste plastics treating equipment

This invention relates to a flue gas treating process including a heat recovery step for recovering heat from flue gas by means of a heat exchanger (,) and thereby cooling the flue gas, and a subsequent absorption step for bringing the flue gas into gas-liquid contact with an absorbing fluid (D) in absorption towers (,) so as to remove at least SO,present in the flue gas by absorption into the absorbing fluid (D), which is characterized, for example, in that a powder addition step for spraying a powder collectable in the absorption step into the flue gas is provided prior to the heat recovery step. This invention makes it possible to provide a flue gas treating process in which a countermeasure against SO,present in flue gas can be easily achieved without resorting to ammonia injection and the flue gas can further be purified without the disadvantage of causing the injected substance to remain in the treated flue gas.

Flue gas treating process and system

Five combustion exhaust gas treatment systems capable of removing dust and selenium (Se) in combustion exhaust gas and making harmless are proposed: (1) combustion exhaust gas is cooled to 350.degree. C. or less, dust is separated, Se is transformed into insoluble compound, and Se is separated; (2) combustion exhaust gas is cooled to 350.degree. C. or less, dust is separated, Se elution preventive agent is added, and dust is formed into scale; (3) dust in combustion exhaust gas is collected by dust collector, dust is formed into slurry by making use of part of circulation liquid in desulfurization apparatus, and tetravalent Se in dust slurry is transformed into insoluble compound, which is separated into solid and liquid; (4) dust is separated from combustion exhaust gas by dust collector, and it is heated to gasify Se, and is led into desulfurization apparatus, etc., and formed into slurry, and Se is made into insoluble compound; and (5) a treating agent for making tetravalent Se insoluble is added to part of circulation liquid in desulfurization apparatus, and it is sprayed into combustion exhaust gas to make Se insoluble.

Disclosed is an economical process for treating a large amount of plastics waste in which thermoplastics, crosslinked plastics, thermosetting plastics or a mixture thereof can be continuously and rapidly degraded and converted into oil without sorting various types of plastics waste. According to this process, powdered plastics obtained by grinding thermoplastics, crosslinked plastics, thermosetting plastics or a mixture thereof is mixed with water to form a slurry, and a dispersing agent such as a water-absorbing resin, a water-soluble polymer or a surface-active agent is added thereto. The resulting mixed slurry is fed to a tubular continuous reactor where the powdered plastics is degraded under reaction conditions causing the water to be in or near its supercritical region. Finally, oil is recovered from the reaction product.

Process and system for converting plastics waste into oil

Flue gas is treated for the presence of SO.sub.3, without resorting to ammonia injection, by adding a powder into the flue gas and subsequently bringing the flue gas into gas-liquid contact with an absorbing fluid, whereby the SO.sub.2 present in the flue gas is removed by absorption into the absorbing fluid. The treatment process may also include introducing the flue gas into a dust collector, whereby dust, including the powder present in the flue gas, is collected, and/or recovering heat from the flue gas by means of a heat exchanger, whereby the flue gas is cooled. A system for treating flue gas is also provided.

Exhaust gas desulfurization system

There is provided a method for flue gas desulfurization which is capable of conducting minute control of oxidation and which is capable of maintaining the concentration of sulfurous acid in an absorbent liquid within a proper range in a highly reliable and efficient manner, even in the case where an abrupt change occurs in the operational conditions of the system. In the method for controlling the oxidation in flue gas desulfurization, the value of proportional sensitivity K in the feed back control process, which is based primarily on the oxidation-reduction potential, is increased depending on the deviation .epsilon. in a region where the detected oxidation reduction potential value PN is below the target oxidation reduction potential value SN in correspondence with the characteristic change of the oxidation-reduction potential against the concentration of sulfurous acid.

Method for controlling oxidation in flue gas desulfurization

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Hiroshima, Japan

Naohiko Ukawa