The Tokyo Electric Power Company, Incorporated

Taiheiyo Cement Corporation

Kouji Kondou

Osamu Yamaguchi

Junichi Terasaki

Yasuhiro Uchiyama

Jun Motohashi

Harutoshi Kidachi

Masafumi Nakazaki

Chikashi Nakazawa

An exhaust gas treatment method including: (A) a step of treating exhaust gas from cement manufacturing equipment by using a dust collectorto collect dust containing chlorinated organic compounds, and discharging the exhaust gas after the treatment by the dust collector, and (B) a step of charging all or part of the dust collected by the dust collectorinto a place (e.g. a rotary kiln, a pre-calciner, and a cyclone) having a temperature of at least 800&#xb0; C. inside the cement manufacturing equipment. The remainder of the dust from step (B) maybe charged into a place (e.g. a raw material supply passage) having a temperature below 800&#xb0; C. inside the cement manufacturing equipment, provided the amount of the remainder to be charged is smaller than a certain amount. Chlorinated organic compounds such as dioxins in the exhaust gas can be decomposed efficiently to be made harmless, merely by including simple and low-cost means (e.g. a dust feeding means, etc.).

Method and system for treating exhaust gas from cement manufacturing equipment

The invention is directed to an apparatus for detecting if a distributed power supply is switched from cooperation with another power system to isolated or single operation. The distributed power supply includes a synchronous generator and possibly also another power source such as an induction generator. The single operation detecting apparatus includes a frequency detector connected to a line system of a customer, reactive power regulating equipment connected to the distributed power supply, a fluctuation signal generator for providing periodic small fluctuations to a reactive power setter of the reactive power regulating equipment, and a single operation signal generator for monitoring the output of the frequency detector to output a single operation signal when the monitored output deviates from a range between allowable upper and lower limits around a reference frequency. It is possible to detect the isolated or single operation mode by actively disturbing the balance between the energy generated by the distributed power supply and the power consumed by the distributed power supply, when the distributed power supply disconnected from the cooperation with power system.

Single or isolated operation detecting apparatus for a distributed power

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Tokyo, Japan

Kouji Kondou