Round-tube-type drying machine

Abstract

The invention discloses a round-tube-type drying machine. The drying machine comprises a transmission mechanism, a machine support, a jacketed heating housing and a heat shaft round tube heating trayset. In the drying machine, sludge is heated and dried through multiple circles of heat exchange ring tubes, dry sludge and wet sludge are backmixed and intensively stirred under the relative action of advancing scrapers and retreating scrapers between the heat exchange ring tubes, thus, the sludge is dried and passes through a viscous zone quickly, the moisture of sludge at the front section is reduced, the sludge amount of the heating surface at the rear end is increased, the drying capacity of the unit heating surface of the drying machine is increased on the whole, and the equipment cost is reduced; the drying machine can be widely applied to heat drying in various sludge treatment fields, such as municipal sludge, industrial sludge and oilfield sludge, and can also be applied to thermal desorption and thermal decomposition of some solid wastes.

Description

technical field [0001] The invention belongs to the technical field of thermal drying of sludge, solid waste heat desorption and thermal decomposition, and in particular relates to a circular tube drying machine. Background technique [0002] In the fields of energy, chemical industry, petroleum, textile printing and dyeing, papermaking, municipal and other fields, a large amount of sludge with high moisture content is usually produced. [0003] The composition of sludge is very complex. In addition to a large amount of water, it also contains a large amount of organic matter, refractory organic matter, various trace elements, pathogenic microorganisms, parasite eggs, heavy metals, etc., and is accompanied by stench. [0004] At present, sludge disposal methods include landfill, agricultural use, and incineration. Sludge incineration has the obvious advantages of reduction, harmlessness, and resource utilization. During the incineration process, all germs are killed, the s...

AI Technical Summary

Problems solved by technology

This has caused the sludge of these two dryers to stay in the viscous zone for a long time. At this time, the sludge is easy to adhere to the heating surface and is not easy to fall off, resulting in an increase in the thermal resistance of the sludge and a decrease in the drying rate. The scraper breaks the sludge, but none of them can solve the problem of sludge sticking well

[0008] In addition, as the sludge is dried and dehydrated, the volume of the sludge is greatly reduced, and the amount of sludge in contact with the rear-end heating surface of these two dryers is greatly reduced compared with the front-end heating surface, resulting in the rear-end heating surface can only be The sludge is partially heated at the bottom, and the heating surface is not effectively utilized, which is equivalent to wasting part of the heating surface

[0009] In addition, the heating surfaces around the main shaft of these two drying machines are all plate structures, which have poor pressure bearing capacity, so if steam drying is used, generally the maximum saturated steam pressure can only be controlled at 0.2-0.8MPa , which correspondingly limits the temperature increase of the heating steam, which is not conducive to improving the drying heat transfer rate per unit area

[0010] In addition, the drying waste gas of the two types of dryers currently in use is subjected to cyclone dust removal after leaving the dryer through the connecting pipe, which causes a large amount of dust in the drying waste gas to block the connecting pipe. The farther the distance is, the more serious it is. It also complicates the system

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