Method and process for co-combustion in a waste-to-energy facility

摘要

The co-combustion process may comprise the following unit operations: routing of hot gas ( 10 ) generated in the clinker cooling process to a rotary kiln ( 1 ); use of part of the rotary kiln exhaust gas to dry solid wastes in rotary dryers; leading the gases from both the dryer and the combustion kiln to the secondary combustion chamber ( 2 ); use of additional fuel to boost up the secondary combustion chamber reaction temperature to as high as 1200° C.; primary dry gas scrubbing in a precalciner or precalciners ( 3, 3 a); heat recovery ( 4 ) and power generation; secondary gas scrubbing ( 5 ) in a semi-dry scrubber; bag filtering after activated carbon injection and returning of all the collected ash and used carbon into the waste kiln and/or a cement kiln. Detrimental materials for cement processing generated by waste combustion can be by-passed to a scrubbing system and a cement kiln. Residue slag from waste kilns can be treated and reused.