Hitachi, Ltd.

Babcock-hitachi Kabushiki Kaisha

Hitachi Plant Engineering Construction Co., Ltd.

Babcock-hitachi K.k.

Hokkaido Electric Power Company, Inc.

Babcock-hitachi, Ltd.

Tsukasa Nishimura

Hiroshi Kuroda

Masanori Fujii

Masakatsu Nishimura

Shigeru Nozawa

Sumihiro Miura

Osamu Kanda

Taiki Hashimoto

Nobuo Yoshida

Shinpei Matsuda

Toshio Sawa

Shigeoki Nishimura

Toshikatsu Mori

Yasuyuki Nishimura

Teruo Kumagai

Seiichi Kikkawa

Takanori Kuwahara

Kouji Otani

Ikuo Shimokobe

Kenji Shibata

Tadaaki Mizoguchi

Yoshinori Okubo

Tsutomu Ueno

Hiraki Mikami

Kosaku Otsubo

Satoshi Kudo

A storage apparatus and its control method capable of shortening data save time at the time of power shutdown are suggested. The storage apparatus includes a processor for controlling reading/writing user data from/to a disk device(s), and a cache memory for storing user data sent and received between a channel adapter and a the disk adapter and control data used by the processor, wherein the control data is sorted into and stored in the nonvolatile memory or the volatile memory according to its update frequency.

Storage apparatus and its control method

A storage system, which is coupled to a computer, includes a storage device, a controller, a plurality of cache memory units, and a connecting unit. Each of the plurality of cache memory units includes: a cache memory for storing data; an auxiliary storage device for holding a content of data even after shutdown of power; and a cache controller for controlling an input/output of data to/from the cache memory and the auxiliary storage device. The cache controller store data stored in the cache memory, which is divided into a plurality of parts, into a plurality of the auxiliary storage devices included in the plurality of cache memory units.

Storage system and data management method

A process for producing a hydrated and cured product of a lime-gypsum-coal ash mixture capable of constituting a high-performance desulfurizing agent, with a high yield and in a simplified manner is provided, which process comprises adding water to a mixture of lime, used desulfurizing agent and coal ash, followed by kneading the resulting mixture, then extruding the resulting kneaded material through a hole of 2 to 10 mm in diameter to obtain bullet-like materials, hydrating and curing said bullet-like materials, followed by drying.

Process for producing hydrated and cured product of lime-gypsum-coal ash

A flue gas desulfurization process by which gypsum can be recovered; the amount of water used therein is small, the effluent is treated in a closed system, the equipment used is minimized, and no scaling occurs; and an apparatus therefor are provided, the process including the following first process and second process: the first process comprising a cooling step of cooling and dedusting a SO.sub.2 -containing flue gas and removing acidic gases, an absorption step of contacting the cooled gas with a slurry containing limestone and lime to absorb and remove SO.sub.x and form CaSO.sub.3, a pH-adjusting step of adding H.sub.2 SO.sub.4 to the resulting slurry, an oxidation step of blowing an oxygen-containing gas in the pH-adjusted slurry to form gypsum, a step of concentrating the resulting gypsum slurry, a step of adjusting the concentration of the resulting slurry, a step of centrifugally separating gypsum, and a step of treating the effluent discharged from the cooling step, and the second process comprising, in the first process, further feeding the slurry of the absorption step to the cooling step where unreacted limestone is reacted with SO.sub.2 to form CaSO.sub.3 .

Flue gas desulfurization process

A flue gas desulfurization process capable of producing a high purity gypsum and also making equipment employed as minimum as possible is provided, which process comprises the steps of cooling and dedusting flue gas containing SO.sub.x ; contacting the cooled gas with a slurry containing limestone to remove SO.sub.x by absorption and also form CaSO.sub.3 ; controlling the pH of the resulting slurry and then blowing air therein to form gypsum; and separating gypsum from the resulting slurry. As a modification of the above process, the slurry of the above second absorption step is further fed to the above first cooling step where unreacted limestone and SO.sub.x are reacted to form CaSO.sub.3.

Limestone-gypsum flue gas desulfurization process

An improved process for desulfurizing combustion exhaust gases of mainly coal containing sulfur oxides, HF and dust containing Al is provided, which process consists of four steps; a first step of contacting the gases with calcium carbonate or hydroxide in the form of slurry to convert the sulfur oxides into CaSO.sub.3 ; a second step of contacting O.sub.2 with the resulting slurry to convert CaSO.sub.3 into CaSO.sub.4 ; a third step of separating CaSO.sub.4 and mother liquor from the resulting slurry; and a fourth step of preparing a slurry of calcium carbonate or hydroxide to be employed in the first step, from the mother liquor, the pHs of the slurry and the mother liquor in the first and fourth steps being adjusted to 5 or higher by adding alkali such as sodium carbonate. According to the present process, it is possible to prevent hindrance of HF and Al contained in dust to the reaction of SO.sub.2 -absorbent (CaCO.sub.3 or Ca[OH].sub.2) with SO.sub.2 gas, and thereby improve percentage desulfurization and also obtain a high quality gypsum.

Process for desulfurizing combustion exhaust gases

Waste water issued from a wet type desulfurization apparatus and containing thionic acid ions is introduced into ion-exchange towers filled with weak-basic anion-exchange which has to effect anion exchange therein. The weak-basic anion-exchange resin which has adsorbed the thionic acid ions is desorbed by contacting an alkaline solution. The thionic acid ions included in the desorbing solution are decomposed by heating them in the presence of acid. A decomposed solution is issued out of the system after its neutralization.

Method of treatment of waste water containing sulfur compounds

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Kure, Japan

Tsukasa Nishimura