System and process for drying sludge using pulse combustion internal heating fluid bed

Abstract

The invention discloses a system for drying sludge using a pulse combustion internal heating fluid bed. The system comprises a pulse combustor, a wet sludge feeding granulating device, an internal heating fluid bed drier, a dust removing device and a deodorizing device. The invention also discloses a corresponding process for drying the sludge using the pulse combustion internal heating fluid bed. According to the invention, the process that the pulse combustion is combined with the heating fluid bed is adopted for sludge drying, so that the drying intensity is improved, the energy consumption is reduced, the treatment quantity of waste gas is reduced, and meanwhile the oxygen content of the system is reduced; dust combustion and explosion danger are prevented; and the system and the process are safe and reliable.

Description

technical field [0001] The invention relates to a pulsating combustion internal heating fluidized bed system and process for sludge drying. Background technique [0002] Sludge is produced in a large amount, is unstable, has a foul smell, and contains toxic and harmful substances such as pathogenic microorganisms. If it enters the environment without proper treatment, it will cause secondary pollution to water bodies and the atmosphere. Therefore, the purpose of sludge treatment and disposal and the guiding principles to be followed are "reduction, stabilization, harmlessness and recycling". To achieve the "four modernizations" required above, removing moisture is the key. After the traditional concentration and dehydration process, the moisture content of the sludge cannot reach below 60%, and the moisture content of the economical mechanical dewatering cake is about 75%. In order to achieve the deep dehydration of sludge, it is necessary to introduce the drying technolog...

AI Technical Summary

Problems solved by technology

Its advantages are simple process flow, large single-machine processing capacity, and easy industrialization. The disadvantages are that the production equipment is huge, covers a large area, and takes a long time to dry. Large, the whole drying process is less economical

Its advantages are high drying efficiency, no danger of explosion and fire, small tail gas emissions, low operating costs, and good economics in the entire drying process. The disadvantages are that the drying process and equipment are more complicated, and the processing capacity of a single machine is small. And it is easy to stick to the wall, so it is not suitable for the sludge with strong adhesion

Representative devices such as the high-speed film dryer designed by Vomm, the new fluidized bed dryer developed by Sulzer, and the belt dryer introduced by Envirex also have disadvantages such as large energy consumption and serious adhesion problems.

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