A sludge fluidized bed drying device

Abstract

The invention discloses a sludge fluidization bed drying device with the purpose of using abrasive to grind sludge during drying. The sludge fluidization bed drying device has the benefits of achieving the cyclic utilization of abrasive, effectively preventing a heating surface from being worn, and preventing impurities from being mixed into sludge drying process. The technical proposal is that the sludge fluidization bed drying device comprises a grinding bed, a material return bed and a drying bed which are connected sequentially, a center spacer is arranged between the grinding bed and the material return bed, passages are arranged at the upper part and the lower part of the center spacer and are communicated with the material return bed, a partition plate is arranged between the material return bed and the drying bed, a passage is arranged at the upper part of the partition plate and communicated with the drying bed, a sludge inlet and an abrasive inlet are formed in the grinding bed, a second heating pipe is arranged in the material return bed, an inlet baffle is arranged at the sludge inlet of the drying bed, an outlet baffle is arranged at the discharge opening of the drying bed, a first heating pipe is arranged in the space between the inlet baffle and the outlet baffle, and a plurality of hoods are arranged on the baseboards of the grinding bed, the material return bed and the drying bed and connected with a fluidization fan through fluidization air ducts.

Description

technical field [0001] The invention relates to the field of sludge treatment, in particular to a sludge fluidized bed drying device. Background technique [0002] (1) Requirements for sludge treatment and disposal [0003] 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. [0004] 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 ...

AI Technical Summary

Problems solved by technology

[0007] (1) The continuous consumption of river sand increases the cost;

[0008] (2) A large amount of river sand is added to the fluidized bed dryer, which causes the heating surface in the fluidized bed dryer to wear and the failure rate increases;

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