System device for directly and effectively spray-drying high-solid-content sludge and method thereof

Abstract

The invention provides a system device for directly and effectively spray-drying high-solid-content sludge, which comprises a hopper, wherein the hopper is connected with a feed pump and used for feed agitation, the feed pump is connected with one end of a nozzle in a spray drying tower through a pipeline, and the other end of the nozzle is connected with an air compressor; an air inlet at the lower part of the spray drying tower is connected with a hot blast furnace through the pipeline, the top of the spray drying tower is connected with a dust remover through the pipeline, the dust remover is connected with a smoke gas wet recovery tower through the pipeline provided with an exhaust fan, and the recovery tower is communicated with a pool arranged at the bottom of the recovery tower and a nozzle at the top through the pipeline provided with a water pump. The invention also provides a method adopting the system device for directly and effectively spray-drying the high-solid-content sludge. The invention has the effects that the energy consumption is low by using the method, and the atomized sludge has small grains, uniform diameter, good drying effect, high loosening degree and high porosity and is markedly superior to other drying forms. The produced drying sludge is adaptable to the paths of combustion heating, cement manufacture, greening, landfill and the like.

Description

technical field [0001] The invention relates to sludge treatment and disposal technology, in particular to a system device and method for directly and efficiently spraying and drying high-solid-content sludge of municipal sludge drying treatment, and is also applicable to industrial sludge, pipe network sludge and river sludge. Drying treatment of lake sludge. Background technique [0002] According to research and analysis, sludge and water molecules are very closely combined and have different phase states: free water; physically bound water, such as capillary / interstitial water, colloidal / surface adsorbed water; chemically bound water is called "Balanced water" includes intracellular water and molecular water. [0003] Free water can be removed by gravity sedimentation and mechanical action in sewage treatment plants. According to different process technologies, the moisture content of the sludge after removal is different, usually 65-95%. [0004] "Physically bound wa...

AI Technical Summary

Problems solved by technology

In the former, because the material is not fully dispersed, in order to ensure safe operation, the air inlet temperature in the bed is relatively low (about 220°C), so the overall thermal efficiency is low and the drying cost is high

At the same time, the requirements for supporting equipment are high and the investment is large, which hinders the popularization and application of this technology; while the existing spray-rotary incineration technology has poor atomization effect, the particle diameter is 200~2000μm, and the sludge to be treated needs to be treated by slurry mixing first. Increase its fluidity, so additional energy consumption is increased, and there are still problems of low drying efficiency and high cost

Moreover, due to the poor atomization effect, it must be used in conjunction with an incinerator to use coal mixed sludge to burn to generate heat to generate high-temperature flue gas, otherwise the coal consumption will be higher or only semi-dried sludge can be obtained, which limits the scope of application

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