System and method for treating bleed gas from cement kiln

Abstract

The invention relates to a system and method for treating a bleed gas from a cement kiln. The bleed gas from the cement kiln is purified with a catalyst by efficiently removing organic pollutants contained in the bleed gas, while minimizing the poisoning of the catalyst by an acidic gas. A system (1) for treating a bleed gas from a cement kiln is provided which includes: a probe (5) which bleeds a kiln discharge gas passage, which extends from the bottom of a cement kiln to a lowermost-stage cyclone, of part of a combustion gas; a first heat exchanger (11) which recovers heat while cooling the bleed gas (G2) taken out by the probe (5); a bag filter (12) which separates dust from the bleed gas (G2) cooled by the first heat exchanger (11); a second heat exchanger (17) by which the bleed gas (G3) from which dust has been separated is heated with the heat recovered by the first heat exchanger (11); and a catalyst device (18) which decomposes organic pollutants contained in the bleed gas (G4) heated by the second heat exchanger (17) and removes the pollutants therefrom.

Description

[0001] This application is a branch of an invention patent application titled "processing system and method for extracting gas from a cement kiln", the international application date is February 25, 2009, the international application number is PCT / JP2009 / 053323, and the national application number is 200980106621.5 case application. technical field [0002] The present invention relates to a treatment system and treatment method for the exhaust gas of a cement kiln, especially related to the removal of the organic pollution contained in the exhaust gas extracted from the kiln exhaust flow path from the kiln tail of the cement kiln to the cyclone at the lowest stage Substance handling systems, etc. Background technique [0003] In the past, in cement manufacturing equipment, among chlorine, sulfur, alkali, etc., which caused problems such as clogging of preheaters, chlorine in particular has attracted attention. A chlorine bypass system, in which part of the combustion gas ...

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Problems solved by technology

[0005] As mentioned above, in the chlorine bypass system, although chlorine-containing dust is separated and recovered from the extracted combustion gas, the extracted gas after the dust has been separated still contains a considerable amount of sulfur oxides (SO X ), so it cannot be directly released to the atmosphere by the chlorine bypass exhaust

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