Rake drying method for drying sludge by utilization of high-temperature flue gas

A technology of high-temperature flue gas and rake drying, which is applied in the direction of dehydration/drying/thickened sludge treatment, etc., can solve the problems of low dissipation, low energy consumption, and low labor intensity, and achieve reduced resistance, reduced power consumption, and reduced Effect of power consumption and operating costs
CN102730933AInactive Publication Date: 2012-10-17SOUTHEAST UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
SOUTHEAST UNIV
Publication Date
2012-10-17
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a rake drying method for drying sludge by the utilization of high-temperature flue gas and a device thereof. Sludge drying is a sludge disposal method, and the level of energy consumption during the drying process relates directly to the operation cost of sludge drying. Therefore, according to the invention, high-temperature flue gas generated from an incinerator is directly used for drying sludge, thus greatly reducing the operation cost of sludge drying. The method comprises the following steps of: allowing high-temperature flue gas to enter from a drying medium inlet (4) at one end of a sludge rake drier, allowing wet sludge to enter from a sludge inlet (3) at the same end to operate together with the high-temperature flue gas, letting the wet sludge in the sludge rake drier directly contact with the hot flue gas so as to realize the drying process, crushing massive sludge and pushing the sludge towards the other end of the sludge rake drier from the inlet by the use of a rake teeth (10) part, allowing the dried sludge to leave the sludge rake drier together with the flue gas from a drying medium outlet (7), letting the dried sludge to enter a gas-solid separator in a subsequent system, further utilizing the collected dry sludge, and discharging the dedusted flue gas into the atmosphere from a chimney.
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Description

technical field

[0001] The invention relates to a method and a device for directly using high-temperature flue gas to dry sludge, and belongs to the technical field of sludge treatment and disposal. Background technique

[0002] Sludge is a product of sewage treatment. Sludge has high organic content, is perishable, has a strong odor, and contains parasite eggs, pathogenic microorganisms, heavy metals such as copper, zinc, chromium, mercury, salts, and polychlorinated biphenyls. , dioxins, radionuclides and other refractory toxic and harmful substances, if they are not properly treated, they will be discharged arbitrarily, which will cause secondary pollution.

[0003] At present, the disposal methods of sludge are mainly landfill and composting. The landfill disposal method will occupy a large amount of land resources and easily cause secondary pollution. According to the methods of sterilization and aging, compost has different fertilizer efficiency and safety. This disp...

Claims

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