Drying and incineration system, and drying and incineration method for sludge

The invention discloses a drying and incineration system, and a drying and incineration method for sludge. The system comprises a dryer used for drying wet sludge, a fluidized bed incinerator used forcarrying out incineration treatment on the dried sludge and exhaust gas of the dryer, a waste heat boiler used for recovering and utilizing high-temperature smoke waste heat generated due to incineration, an air pre-heater used for re-recovering the smoke waste heat and providing hot air combustion-supporting wind for the incinerator, and a tail gas treatment device used for purifying smoke subjected to waste heat utilization and then discharging the smoke, wherein one path of a high-temperature smoke outlet of the incinerator communicates with the dryer, and carries out contact drying on thewet sludge, the other path is connected with a flue of the waste heat boiler, and an exhaust port of the dryer communicates with the incinerator. A part of the high-temperature smoke is circulated inthe dryer and the incinera