Hitachi, Ltd.

Babcock-hitachi Kabushiki Kaisha

Takahiro Tachi

Akira Kato

Hisao Yamashita

Tomoichi Kamo

Hiroshi Kawagoshi

Toshio Ogawa

Tatsuya Suzuki

Yasuyoshi Kato

Fumito Nakajima

Osamu Kuroda

Shinpei Matsuda

Masakatsu Hayashi

Hiroshi Miyadera

Toshijiro Ohashi

Yuzo Hiroshige

Yuji Ochiai

Takashi Kitamura

Akio Honji

Masakatsu Fujishita

Noriko Watanabe

Miho Saito

A manufactured article treatment processing method and system includes reading out from a manufactured article being subjected to treatment information of component parts of the article and specific properties of the component parts, extraction of the component parts to be separated on the basis of predetermined specific properties serving as information for detachment and specific properties of the component parts, and treatment of the component parts to be separated and other components parts through different processes, respectively.

Manufactured article treatment processing system

A treatment processing system for determining proper and appropriate treatment methods and procedures in accordance with states of discarded articles and outputting the determined procedures. Treatment methods are decided which are desirable for manufactured articles for carrying out corresponding treatments of the manufactured articles. The treatment processing system includes a unit for reading out information affixed to the discarded articles, a unit for storing databases for required information, a treatment procedure decision unit, a treatment procedure altering unit, and a detector for detecting whether or not treatment is being executed in conformance with the relevant treatment procedure.

Product disposal system

An apparatus is provided for purifying an exhaust gas discharged from an internal combustion engine, which comprises a first exhaust gas passage including a nitrogen oxide removing catalyst and a three way catalyst, a second exhaust gas passage including the three way catalyst, a gas flow regulator for selectively directing the exhaust gas to the first and second exhaust gas passages, and a control unit which directs the exhaust gas to the first exhaust gas passage (thereby passing exhaust gas first through the nitrogen oxide removing catalyst and thereafter through the three way catalyst) when the temperature of the nitrogen oxide removing catalyst is within a hydrocarbon adsorbing range of temperature thereof while the engine is warming up, and to the second exhaust gas passage (thereby passing the exhaust gas only through the three way catalyst) when the temperature of the nitrogen oxide removing catalyst exceeds the hydrocarbon adsorbing range of temperature thereof.

Exhaust gas purifying apparatus and method for internal combustion engine

An exhaust gas cleaning system has a catalyzer provided in the exhaust passage of the engine and an adsorbent provided upstream from the catalyzer. The adsorbent temporarily adsorbs unburned hydrocarbons emitted in large amounts immediately after the engine is started. The system provides an amount of air required to substantially eliminate unburned hydrocarbons, based on the temperature of the adsorbent and the oxygen concentration in exhaust gas upstream from the catalyzer. An air supplying unit is provided upstream from the adsorbent. A temperature sensor is provided for the adsorbent. An oxygen sensor is provided at the inlet of the catalyzer. A control unit calculates the amount of air (oxygen) necessary for the catalyzer to convert the unburned hydrocarbons released from the adsorbent, based on signals from the temperature sensor and the oxygen sensor and the exhaust flow rate. The control unit accordingly controls the air supplying unit.

System for controlling oxygen concentration in exhaust gas and exhaust

A process for removing nitrogen oxides from exhaust gases containing volatile metal compounds with good efficiency by contacting the gases with a catalyst comprising TiO.sub.2, difficulty reduced by the compounds, in the presence of ammonia, and such a catalyst are provided, which process is characterized in that the average pore diameter of the TiO.sub.2 is 10,000 .ANG. or less and the proportion of the volume of pores having pore diameters of 400-5,000 .ANG. to the total pore volume is 50% or more; a denitration-active component is supported on the TiO.sub.2 ; a catalyst carrier precursor comprising an aqueous slurry sol of TiO.sub.2 or Ti hydroxide prepared by hydrolyzing a Ti salt is precalcined at 150.degree.-700.degree. C., followed by adding a denitration-active component and then normally calcining the mixture; and a polymer compound having a thermal decomposition temperature of 110.degree. to 300.degree. C. is added in 1-20% by weight to the catalyst carrier precursor, followed by precalcining the mixture at the thermal decomposition temperature or higher.

Process for removing nitrogen oxides

A process for removing nitrogen oxides from exhaust gases containing volatile metal compound by the use of a catalyst the activity of which is hardly reduced by the volatile metal compound and a catalyst for the process are provided, which process comprises contacting the exhaust gases with a catalyst comprising TiO.sub.2 and a composite oxide of vanadium and molybdenum and/or a composite oxide of vanadium and manganese in the presence of ammonia.

Catalyst for removing nitrogen oxides

A process for removing nitrogen oxides from exhaust gases containing at least nitrogen oxides and volatile metal compounds by the use of a catalyst having prevented activity reduction due to the volatile metal compounds and having a superior durability is provided, which process comprises contacting the exhaust gases with a catalyst containing TiO.sub.2, a compound active to nitrogen oxides-removing reaction such as oxides of V, Cr, Mo, W, Fe, Co, Ni, Cu, Ce, etc. and/or sulfates thereof and a metal sulfate containing water of crystallization such as those of Al, Mg or Mn, in the presence of ammonia at 150.degree. to 600.degree. C.

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Hitachi, Japan

Takahiro Tachi