Hitachi, Ltd.

Babcock-hitachi Kabushiki Kaisha

Takeo Komuro

Yukio Hishinuma

Hidetoshi Akimoto

Hisao Yamashita

Shin Tamata

Fumito Nakajima

Shuichi Kanno

Norio Arashi

Yasushi Muranaka

Tomohiko Miyamoto

Kenichi Gomi

Ryuichi Kaji

Hideo Kikuchi

Terufumi Kawasaki

Osamu Kanda

Yoshiki Shibano

Hajime Iinuma

Hiroshi Terada

Tsugihiro Yukitake

In order to prevent exhaust pipe for exhausting perfluorocompound (PFC) decomposition gas after washing from corrosion, a mist separating apparatus is provided at a rear stage of the washing tower for washing the PFC decomposition gas. The corrosion of the exhaust pipe can be prevented by removing the mist from the washed gas.

Apparatus for treating perfluorocompound gas

Mineral impurities can be effectively removed from coal by introducing oil droplets into an aqueous slurry of pulverized coal. Coal, which is lipophilic, attaches to the surface of the oil droplets and floats upwardly along with the oil droplets utilizing their buoyancy. On the other hand, mineral impurities, which are hydrophilic, are left in the aqueous slurry.

Process for removing ash from coal

Sulfur oxides contained in the flue gas from coal-fired boiler are adsorbed by an adsorbent prepared by dry-distilling a portion of fuel coal satisfying at least one of requirements of an ash content lower than 15% by weight and a fixed carbon content of at least 50% by weight, thereby producing semi-coke, and activating the semi-coke by steam, and then the sulfur oxides-adsorbed adsorbent is heated to desorb the adsorbed sulfur oxides at a high concentration. The desorbed sulfur oxides are passed through a bed of semi-coke before the activation to recover the sulfur oxides as elemental sulfur.

Process for dry desulfurization of flue gas

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Hitachi, Japan

Takeo Komuro