Waste drying method and its system device

Abstract

The invention discloses a drying method by using a metal object as a heat transfer medium and a system device thereof. The method and the device adopt the granular metal object as the heat transfer medium, make the metal object accept heat of a heat source through a heat exchanger, allow the metal object with certain temperature and mud to be directly contacted and mixed in a drier, and transfer heat of the metal object to the mud by a transmission method, thereby achieving the aim of intensifying heat transfer, heating the mud and evaporating moisture in the mud. The device has the advantagesof simple and reliable system, strong controllability, good adaptability to multiple kinds of mud, requirement fulfillment to different specifications, small occupied area, low investment, high heatefficiency and the like, solves the technical problems of difficult tail gas treatment, high energy consumption and the like in the direct convection type drying technology by using flue gas or hot air as the heat transfer medium, and avoids the defects of complicated equipment, high cost, small capacity of single equipment, easy wall adhesion and the like in the indirect conduction type drying technology by using vapor or conduction oil as the heat transfer medium. The method and the device can be used for drying mud and other wet materials, household garbage and other waste materials.

Description

technical field [0001] The invention relates to a waste treatment technology, in particular to a waste drying method using metal as a heat transfer medium and its system device, which is suitable for drying wet materials such as sludge, and also for domestic and industrial waste Pretreatment of waste such as drying and crushing. Background technique [0002] With the continuous improvement of my country's water environment protection requirements, a large number of sewage treatment facilities have been constructed and put into operation, accompanied by a large amount of high-moisture (70%-85%) sludge, if these sludge cannot be timely, effectively and efficiently Stable treatment and disposal will bring great environmental hazards to the surrounding areas. [0003] Regardless of whether the sludge treatment is incineration, agricultural use or as a raw material for building materials, choosing an appropriate drying process is the key to reducing investment and operating costs...

AI Technical Summary

Problems solved by technology

In the existing drying technology, the direct convection technology using flue gas or hot air as the heat transfer medium cannot effectively deal with the exhaust gas and high energy consumption generated during the drying process, making it difficult to be applied in sludge drying.

The indirect conduction technology using steam or heat transfer oil as the heat transfer medium is restricted in its application due to its complex equipment manufacturing process, high cost, small capacity of a single equipment and easy to stick to the wall.

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