Bypass ventilation energy-saving and emission-reduction utilization system and process for co-processing wastes in cement kiln

The invention relates to a bypass ventilation energy-saving emission-reduction utilization system and process for co-processing wastes in a cement kiln, and is mainly applied to cement production enterprises. The system comprises a kiln tail smoke chamber, a first-stage quenching device, a first-stage quenching fan, an SNCR denitration device, a second-stage air mixing device, a second-stage air mixing fan, a kiln tail bag dust collector, a kiln tail SP waste heat boiler, an air preheater, an air blower, a dust collector, a tail exhaust fan, a kiln tail chimney and a hot air using device. Thekiln tail smoke chamber, the first-stage quenching device, the second-stage air mixing device, the air preheater, the dust collector, the tail exhaust fan and the kiln tail chimney are sequentially connected through a flue, the first-stage quenching device adopts air cooling, and the second-stage air mixing device adopts kiln tail SP waste heat boiler outlet smoke as cooling gas for cooling. In order to meet the environme