Sludge drying device based on industrial waste heat

Abstract

The invention provides a sludge drying device based on industrial waste heat. The sludge drying device comprises a cavity and a heat exchange device, wherein a feed port and a discharge port are formed in two ends of the cavity respectively, and sludge enters the cavity from the feed port and is discharged from the discharge port; the heat exchange device is arranged on the outer wall of the cavity and provides a heat source to exchange heat with the sludge to dry the sludge, and the heat source in the heat exchange device adopts recovered industrial waste heat. According to the sludge dryingdevice based on the industrial waste heat, the heat exchange device adopting the recovered industrial waste heat as the heat source is arranged on the outer wall of the sludge drying device and exchanges heat with the sludge to dry the sludge, so that the problem that toxic and harmful gas is produced by large consumption of steam and overhigh drying temperature in the traditional drying process is solved.

Description

technical field [0001] The invention relates to the field of garbage treatment, in particular to a sludge drying device based on industrial waste heat. Background technique [0002] There are many sewage treatment plants in my country, with a daily sewage treatment capacity of 140 million tons. Sludge is an inevitable product in the sewage treatment process. The current annual output has exceeded 40 million tons, and it is expected to reach 90 million tons in 2020. If such a large amount of sludge is not properly disposed of, it will cause serious environmental problems. However, the sludge disposal rate in my country is only 58% at present, and it is mainly filled up, accounting for about 65%. The sludge filled up takes up a lot of land, and its leachate may pollute groundwater. Therefore, there is an urgent need for efficient sludge reduction, stabilization and harmless treatment and disposal technologies, among which sludge thermal drying technology is one of the importa...

AI Technical Summary

Problems solved by technology

The method of using hot steam and hot flue gas to dry sludge consumes a large amount of high-quality heat energy on the one hand; on the other hand, the drying temperature is relatively high, generally at 150-200°C, which easily leads to the precipitation of organic volatile components in sludge, resulting in Toxic and harmful gas

In addition, the structure of the equipment is complicated, and the sludge is easy to adhere to the shaft or the wall of the equipment, and the important parts of the equipment are seriously worn after long-term use; the sludge is greatly tossed or even fluidized in the existing equipment, which may generate dust and cause the risk of dust explosion

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