Sludge fermentation stirring device

Abstract

The invention relates to a sludge fermentation stirring device which comprises a stirring main shaft and a plurality of stirring units fixedly arranged on the stirring main shaft; the stirring deviceis rotationally arranged in a sludge aerobic fermentation tower; a tower plate A and a tower plate B are alternately arranged in the tower to form a turn-back moving path of sludge materials, and theinclination directions of scraping blades on the tower plates of different types are arranged in opposite directions; the torsion borne by the stirring main shaft is optimized by reasonably selectingthe number and the mounting positions of spiral arms; the sizes or inclination angles of the scraping blades are adjusted to enable the areas of circular paths formed by the scraping blades to be thesame, so that the scraping and collecting amounts of the scraping blades are the same in each rotating period, and material accumulation on the tower plates is eliminated; the arrangement also allowsthe layer height of the adjacent tower plates to be reduced; in addition, the torsion borne by the stirring main shaft can be effectively reduced; rake assemblies are arranged between the adjacent scraping plates which are arranged at intervals or on one or more of a plurality of spiral arms; under the condition that the material moving period is not changed, the pile turning and oxygenating frequency is multiplied, the total standing time required by complete fermentation of the materials in the tower is shortened, the diameter and the overall height of tower equipment are reduced, and the equipment operation cost is reduced.

Description

technical field [0001] The invention relates to the technical field of environmental protection equipment, in particular to a stirring device for a sludge aerobic fermentation tower. Background technique [0002] Sludge is a kind of solid waste with a wide range of sources. A large amount of sludge waste will be generated in the process of sewage treatment, municipal river, sewer dredging and other production operations. The industrial treatment and disposal methods of sludge are mainly landfill, composting (fermentation), natural drying, incineration and other methods. At present, the treatment and disposal of sludge in my country is still dominated by direct landfill, but this extensive treatment method not only needs to occupy a large amount of land resources, but also poses a serious threat to the ecological environment. [0003] Sludge composting fermentation, as a resource-based sludge treatment method, has gradually attracted attention in recent years. Compared with ...

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Problems solved by technology

However, if the diameter is too large, the main shaft of the mixing device will continue to bear a large torque, which is prone to fatigue fracture; a large tower height requires a lot of energy to realize the feeding of sludge and the reflux of sludge after fermentation

This makes the cost of the tower sludge fermentation process always high

Moreover, the existing stirring and turning devices are mainly oblique scraper-type stirring devices, which only realize turning and oxygenation during the process of pushing materials, which makes the materials be pushed forward once during each turning and oxygenation process , the overall oxygenation rate of the material is low, it is necessary to extend the residence time of the material by increasing the diameter or height of the tower, so as to ensure the aerobic fermentation time

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