Sludge drying system with high thermal driving force

Abstract

The invention provides a sludge drying system with high thermal driving force. According to the sludge drying system, on the basis of fluidized drying, sludge is radiated by microwaves, so that water molecules in the sludge are prompted to rub and collide with each other so as to heat without the restriction of heat conduction, internal and external heating is uniform, and the water molecules in the sludge are prompted to diffuse outwards under the action of the thermal driving force; granulation and fluidization of the sludge are realized by adopting a sludge spraying and dry backmixing granulation technique, so that a granule structure of which an inner core is basically dry and an outer surface layer is wrapped with the sludge is formed, and complete drying of the sludge is facilitated; the surface layer of the sludge granule is prevented from being quickly dried by adopting a water vapor backflow surface humidity preservation technique, so that more adverse effects are not generated on thermal diffusion of the internal water molecules.

Description

technical field [0001] The invention relates to the technical field of sludge treatment, in particular to a sludge drying system with high thermal driving force. Background technique [0002] Sludge is an important pollution output formed in industrial and agricultural production and urban life. will produce sludge. Sludge contains a large number of harmful microorganisms, heavy metals and organic pollutants. If not properly disposed of, it will have a serious negative impact on the natural environment and people's health. [0003] Sludge incineration is to make the combustible substances in sludge burn at high temperature and make them oxidatively decompose, so as to achieve the purpose of reducing sludge capacity, killing harmful microorganisms, removing toxicity and making full use of energy. Sludge incineration is a widely used and mature sludge high-temperature treatment technology in foreign countries. It can minimize the volume of sludge, and has the advantages of f...

AI Technical Summary

Problems solved by technology

The flow of circulating gas quickly carries away water vapor, which is very effective for drying the sludge surface layer. However, experiments have proved that when the moisture content of the sludge surface layer is sufficiently reduced, it will start to solidify and compact, which will give the sludge The conduction of internal moisture to the surface is hindered, which greatly affects the drying effect

Images