Sludge drying system and method

Abstract

The invention relates to a sludge drying system and method. A flue gas discharged from a boiler is used as fluidized gas of a drying device of a fluidized bed to dry wet sludge, discharged exhaust gas with high concentration of oxygen is introduced into the boiler for carrying out incineration treatment, the hot flue gas discharged from the boiler is used for supplementing the fluidized gas such that the temperature of the fluidized gas is higher than the dew point temperature and the concentration of oxygen in the fluidized gas keeps away from an explosion limit. According to the technical scheme disclosed by the invention, the sludge drying system comprises a boiler, wherein one path of a flue gas exhaust outlet of the boiler is connected with a chimney, the other path of the flue gas exhaust outlet of the boiler is connected with a first gas inlet of a 1# mixer with a three-way structure, a gas exhaust outlet of the 1# mixer is connected with a gas inlet of the drying device of the fluidized bed, a gas exhaust outlet of the drying device of the fluidized bed is connected with a gas inlet of a 2# mixer with a three-way structure, a first gas exhaust outlet of the 2# mixer is connected with a gas inlet of a condenser, a gas outlet of the condenser is connected with a second gas inlet of the 1# mixer, and a second gas exhaust outlet of the 2# mixer is connected to a gas inlet of the boiler; boiler tube bundles are arranged inside a boiler hearth and the boiler tube bundles are communicated with heating tubes of the drying device of the fluidized bed.

Description

technical field [0001] The invention relates to the field of sludge treatment, in particular to a sludge drying system and method. Background technique [0002] With the rapid increase in the amount of sewage treatment, the sludge production has also increased sharply. The moisture content of the dehydrated wet sludge is as high as 75%, containing toxic and harmful substances such as heavy metals, pathogens and persistent organic substances. The wet sludge has a large volume and is easy to deteriorate. , Difficult to handle, if not handled properly, it is easy to cause secondary pollution. [0003] After the sludge is dried, the volume can be reduced by more than 80%. The stability and solidification performance of the dried sludge is greatly improved, it is not easy to deteriorate, it is convenient for transportation and storage, and it is conducive to further resource utilization. The drying treatment of wet sludge has been applied more and more. [0004] Wet sludge cont...

AI Technical Summary

Problems solved by technology

The disadvantage of this technical route is that the dried gas medium after cooling is in a state of water vapor saturation, the subsequent transportation pipelines and equipment are prone to low-temperature corrosion, the equipment failure rate is high, and the operation and maintenance costs are high

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