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

Abstract

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 incinerator, odor of the sludge is brought into the incinerator and directly treated while the sludge is dried by virtue of hot smoke energy, and the system does not need to carry out tail gas deodorization, so that the tail gas dehumidification and deodorization costs are saved; and the whole system realizes adequate energy utilization, and is safe and capable of running for along time.

Description

technical field [0001] The invention relates to a sludge drying and incineration system and a drying and incineration method, belonging to the field of sludge drying and treatment. Background technique [0002] As my country's urbanization process continues to accelerate, the amount and rate of urban sewage treatment continue to increase, and the output of urban sludge, which is the main by-product of sewage treatment, also increases rapidly. Due to the late start of municipal sludge disposal in my country and relatively backward key technical equipment, a large amount of municipal sludge has not been properly disposed of. The incineration method has a significant reduction effect, saves land, can also eliminate various pathogens, and convert toxic and harmful substances into harmless substances. The sludge has a high moisture content and needs to be dried before it can be sent to the incinerator for incineration. The drying process absorbs heat while incineration releases ...

AI Technical Summary

Problems solved by technology

[0006] Purpose of the invention: Aiming at the problems of large energy consumption, high exhaust gas, and large safety hazards in the existing sludge drying and incineration treatment process, the present invention provides a sludge drying and incineration system and a method for sludge drying and incineration using the system. The system and method adopt partial high-temperature flue gas circulation to solve the problem of tail gas treatment, and the system achieves full energy utilization, which is applicable to the disposal of wet sludge with high moisture content

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