Taiheiyo Cement Corporation

Onoda Cement Co., Ltd.

Tetsuo Ogiri

Kenichi Honma

Soichiro Okamura

Youji Kawamura

Yoshihisa Tanaka

Takuya Shindo

Souichirou Okamura

Ryousuke Narishima

Hiroaki Iwakawa

Yoshiaki Sakamoto

To provide a device for removing radioactive cesium from waste material containing radioactive cesium, doing so at low energy and in a dependable manner. The removal devicefor radioactive cesium is provided with: a rotary kilnwhich is provided with a burnersupplying from the kiln outlet an organic matter Ocontaminated with radioactive cesium, and an inorganic matter charging portsupplying from the kiln inlet inorganic matter Scontaminated with radioactive cesium, and which is employed to burn the organic matter Otogether with the inorganic matter S; and a recovery device cooling tower, a cyclone, a bag filterfor recovering cesium that has volatilized in the rotary kiln. A drying/crushing device (dryer, crusher) for drying and crushing the organic matter Oprior to charging the radioactive cesium-contaminated organic matter to the rotary kiln can be provided. Additionally, a reforming/drying/crushing device (reformer, dryer, crusher) for reforming, drying, and crushing the inorganic matter Scan be provided. During burning of the organic matter Otogether with the inorganic matter S, a calcium source can be added as a reaction accelerant A to the rotary kiln.

Removal device for radioactive cesium

To provide a method and an apparatus for removing radioactive cesium from waste containing radioactive cesium at low cost. A radioactive cesium removal apparatusincluding: an incineratorfor burning an inflammable waste polluted with radioactive cesium; a suspension preheaterfor, with the combustion exhaust gas Gand a sensible heat of the incineration ash of a combustible C discharged from the incinerator, generating calcium oxide or/and magnesium oxide from a source of calcium oxide or/and a source of magnesium oxide, cyclones of the suspension preheater being arranged in multistages; a rotary kilnfor burning an inorganic substance S polluted with radioactive cesium together with the calcium oxide or/and the magnesium oxide and the incineration ash Dincluding the radioactive cesium; and collectorsfor collecting cesium volatilized in the rotary kiln.

Method for removal of radioactive cesium and facility therefor

A cyclone comprising a swirl cylinder, an inner tube disposed in the upper section of the swirl cylinder, an inlet duct arranged tangentially to the outer periphery of the swirl cylinder, a drop opening formed in the lower section of the swirl cylinder, and a straightening instrument disposed in a space directly below the inner tube. The straightening instrument includes a conical member coaxial with the inner tube and guide plates arranged along a conical surface at the outer periphery of the conical member. A lower section of each of the guide plates is curved to encounter the turn tangential velocity components of a circumferential spiral stream smoothly into axial velocities alone, and unnecessary vortices which are not required for separation of particles and which cause energy loss are eliminated.

Straightening instrument and cyclone

Growing community of inventors

Tokyo, Japan

Tetsuo Ogiri