Taiheiyo Cement Corporation

Nippon Shokubai Co., Ltd.

Yasuhiro Uchiyama

Junichi Terasaki

Shinichiro Saito

Shinyuki Masaki

Hisashi Kondo

Mitsuharu Hagi

Osamu Yamaguchi

Kouji Kondou

Masafumi Nakazaki

Harutoshi Kidachi

A combustion exhaust gas processing device comprises: a dust collector collecting dust in a cement kiln combustion exhaust gas; a wet dust collector using sodium hypochlorite as a catalyst-poisoning-substance stripper for removing a catalyst-poisoning substance and mercury from a combustion exhaust gas which passed the dust collector; heaters downstream of the wet dust collector for heating the combustion exhaust gas from the wet dust collector; and a catalyst device from which NOx, a persistent organic pollutant, etc. in the heated combustion exhaust gas, are removed. An upstream side of the catalyst device is installed with an oxide catalyst such as titanium-vanadium and a downstream side is installed with a platinum catalyst as a noble-metal catalyst. The temperature of the combustion exhaust gas after the wet dust collector is increased up to 140&#xb0; C. or more with the heaters to prevent decline in denitration efficiency of and the decomposition efficiency of a volatile organic compound. A mercury adsorbing tower is provided for adsorbing the mercury in liquid exhausted from the wet dust collector and wastewater from the liquid is used to generate sodium hypochlorite for use in the wet dust collector.

Device and method for processing cement kiln combustion exhaust gas

A combustion exhaust gas processing device comprises: a dust collector collecting dust in a cement kiln combustion exhaust gas: a wet dust collector as a catalyst-poisoning-substance stripper removing a catalyst-poisoning substance from a combustion exhaust gas which passed the wet dust collector; and a catalyst device from which NOx, a persistent organic pollutant, etc. in the preheated combustion exhaust gas, are removed. A titanium-vanadium catalyst etc. as an oxide catalyst is used upstream of the catalyst device, and a platinum catalyst etc. as a noble-metal catalyst downstream of the catalyst device. The temperature of the combustion exhaust gas after the catalyst-poisoning substance is removed is increased up to 140&#xb0; C. or more with the preheaters to prevent decline in denitration efficiency of and the decomposition efficiency of a volatile organic compound.

Device and method for processing cement kiln combustion exhaust

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

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Ageo, Japan

Yasuhiro Uchiyama