Sludge drying and reducing device and method

Abstract

The invention relates to a sludge drying reduction device and method. The device comprises a drying cylinder which is transversely arranged, wherein the drying cylinder comprises a feeding end and a discharging end; an air inlet is formed in the feeding end of the drying cylinder; an air outlet is formed in the discharging end; a rotating shaft penetrates through the center of an inner cavity of the drying cylinder in an axis direction; the rotating shaft is connected to a motor; a plurality of annular stirring blades are distributed outside the rotating shaft; an included angle of 30-60 degrees is formed between the stirring blades and the radial plane of the rotating shaft; all the stirring blades have the consistent direction. Wet sludge is fed from the feeding end of the drying cylinder, flue gas at the temperature of 850-950 DEG C is introduced from the air inlet of the drying cylinder, the flue gas introduction speed is controlled to be 3-12m / s, and the retention time of the flue gas in the drying cylinder does not exceed 2s. The wet sludge is heated by adopting the high-temperature flue gas, so that the sludge moisture is rapidly evaporated, and the drying efficiency of the wet sludge is improved. Meanwhile, the heat conversion rate is improved, so that the heat efficiency reaches 90%. The sludge drying reduction device has the advantages of high drying strength, low heat energy consumption and energy conservation.

Description

technical field [0001] The invention relates to the technical field of sludge treatment, in particular to a sludge drying and reducing device and method. Background technique [0002] Sludge is the product of sewage treatment. Due to its high water content, complex composition, and more organic matter, it has a certain viscosity. Therefore, the current sludge disposal methods mainly use landfill and composting. However, the landfill disposal method occupies a large amount of land resources and is likely to cause secondary pollution; the method of sterilization and aging of compost can achieve the purpose of recycling, but the treatment process is long, and it will also occupy a large amount of land resources, and the disposal cost is also high. In addition, sludge containing harmful components such as heavy metals should not be disposed of in this way. [0003] The dried sludge can be greatly reduced, harmless and resourceful. At the same time, the dried sludge can be used ...

AI Technical Summary

Problems solved by technology

However, in the above-mentioned technical scheme, the crushing device, the propulsion device and the scraper are arranged sequentially in the machine body from the wet sludge feeding port to the dry sludge discharging port. Therefore, only The crushing, propulsion and scraping functions are realized in sections, and the crushing, propulsion and scraping functions cannot be realized at the same time in the whole process, so it has certain limitations, which affect its high production efficiency and heat conversion rate

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