Disc type sludge drying system based on cascade utilization of energy

Abstract

The invention relates to a disc type sludge drying system based on cascade utilization of energy. The system comprises a disc type drying system and a filter-press drying system, wherein the disc type drying system comprises a casing, a stirring shaft is mounted in the casing, discs are mounted on the stirring shaft in a spaced manner, a sludge inlet and a steam outlet are formed in the top of the casing, a dry sludge outlet is formed in the bottom of the casing, the stirring shaft is driven by a stirring motor at one end, the stirring shaft adopts a hollow structure, one end of the stirring shaft is a hot steam inlet, and a condensed water outlet pipe is inserted into the end; the filter-press drying system comprises a filter-press system, a sludge feeding system connected with the filter-press system, a vacuumization system, a hot water circulating system and a sludge output system, the sludge feeding system is connected with a sludge feeding end of the filter-press system, the sludge output system is connected with is connected with a sludge discharging end of the filter-press system, the vacuumization system is used for keeping the filter-press system in a negative pressure state during filter pressing of sludge, and the hot water circulating system is connected with the steam outlet of the disc type drying system.

Description

technical field [0001] The invention relates to the field of sludge treatment equipment, in particular to the technical field of sludge drying, in particular to a disc sludge drying system based on energy cascade utilization. Background technique [0002] A large amount of sludge will be produced after urban domestic sewage treatment. If the sludge cannot be treated in a timely, effective and stable manner, it will bring great hidden dangers to the urban environment and the safety of people's lives. In addition, industrial processes such as papermaking, chemical industry, tanning, printing and dyeing, and dredging of rivers and lakes will also produce a large amount of sludge. [0003] The reduction and harmlessness of sludge has become a major environmental protection problem that must be solved in the process of urban scientific development. The moisture content of the sludge produced in the sewage treatment plant is still as high as 80% after dehydration, and the volume ...

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Problems solved by technology

[0008] Aiming at the low energy utilization rate of the existing sludge drying system and the disc-type sludge drying equipment, after a long period of research, the applicant found that there is still a fatal shortcoming in that the disc dryer is of high temperature (100 -180°C), high dust (dust generated by sludge drying and rotating propulsion, dry sludge dust is flammable) air environment, and in a state of friction, there is a greater risk of explosion; and, in the existing sludge drying equipment , the scraper on the peripheral surface of the disc is a fixed structure, which cannot change the direction according to the dust pressure, and the dust scraping efficiency is low

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