Patent ID: 7947242

Claim:
A cement kiln chlorine/sulfur bypass system for use with a cement kiln which produces a kiln exhaust including exhaust gas and exhaust dust, the system comprising: an air bleed means for bleeding a kiln exhaust gas passage, which runs from an end of a cement kiln to a bottom cyclone, of a part of a combustion gas including calcium oxide (CaO) and sulfur dioxide (SO 2 ), the air bleed means receiving the kiln exhaust from the cement kiln; a separating means for separating dust in the gas bled by the air bleed means into coarse particles and fine particles; and a wet dust collector receiving the fine particles and exhaust gas from the separating means, the wet dust collector being configured to separate the fine particles from the gas, the wet dust collector further being configured to generate calcium hydroxide (Ca(OH) 2 ) from the calcium oxide (CaO) in the fine particles and the water from the wet dust collector, and to allow sulfur dioxide (SO 2 ) to react with the calcium hydroxide (Ca(OH) 2 ) to remove sulfur from the bled gas.