Efficient low-temperature closed crawler-type sludge drying machine and working method thereof

Abstract

The invention discloses an efficient low-temperature closed crawler-type sludge drying machine and a working method thereof. The efficient low-temperature closed crawler-type sludge drying machine comprises a storage bin, a slitting granulation mechanism, a heat pump mechanism, a mesh belt conveying mechanism, a discharging mechanism, an external sealing box body and a group of box doors, and thegroup of box doors are arranged on the external sealing box body. According to the efficient low-temperature closed crawler-type sludge drying machine, in the sludge dehumidification drying machine-sludge drying process, a dehumidification heat pump is adopted for air dehumidification and heating, and sludge drying is achieved; convection hot air drying is conducted, dry hot air is used as a drying medium, moisture in the sludge absorbs heat waves in the air to be vaporized into the air, and therefore the drying purpose is achieved; when the dehumidification heat pump is used for drying, air is subjected to closed circulation (no waste heat or waste gas is discharged) between the drying chamber and the dehumidification heat drying agent; and traditional hot air drying is an open system which heats air in a drying chamber through a heat source and discharges the air after moisture absorption, and the energy utilization rate is reduced by 20%-50%.

Description

Technical field [0001] The invention belongs to the technical field of solid waste disposal and comprehensive utilization, and particularly relates to a high-efficiency low-temperature closed crawler sludge dryer. The invention also relates to a working method of a high-efficiency low-temperature airtight crawler sludge dryer. Background technique [0002] With the large-scale construction and operation of sewage treatment plants in China, the output of sludge has also increased significantly, and the threat to environmental pollution is becoming more and more serious. Most of the water content of dehydrated sludge is still higher than 80%, and contains a lot of toxic and harmful substances. The nature is unstable and difficult to use as resources. Therefore, proper drying treatment is extremely necessary before final disposal such as composting or incineration. The low-temperature heat pump drying technology in the drying technology has a small footprint and drying The unique a...

AI Technical Summary

Problems solved by technology

[0005] 1. High energy consumption. Drying is a process of net energy consumption. Using steam or heat transfer oil as a heat source requires a large amount of petrochemical energy, and energy consumption usually accounts for more than 80% of the total processing cost; existing drying equipment uses heating exhaust Wet method, low energy utilization rate; every ton of water evaporated consumes about 1.5 tons of steam, and consumes about 70kw.h of electricity;

[0006] 2. Existing waste heat drying of high-temperature flue gas has high drying temperature, large amount of dust, and difficult disposal of exhaust gas;

[0007] 3. There is a safety risk, and there is a safety risk if the drying temperature is above 100°C. In order to avoid explosion, sludge drying usually needs to reduce the oxygen content by adding nitrogen;

[0008] 4. It is not environmentally friendly, emits a large amount of odor, and needs to build a responsible tail gas treatment system; the working environment of the drying workshop is poor; the heating source of the drying process uses a boiler, which also emits a large amount of tail gas, and there is a problem of secondary sludge;

[0009] 5. The drying process is complicated, there is a sticky area, there are many wearing parts of the device, and the maintenance amount is large

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