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Changzhou Xianzhu Drying Equipment Co., Ltd
Working principle and wide application of small sludge dryer
Date: 2025-06-06Read: 5
The small-scale sludge dryer achieves efficient dewatering and capacity reduction through integrated thermodynamic and mechanical design. Its core principles and typical applications are as follows:
1、 Working principle
1. Heat pump low-temperature drying system
The heat pump absorbs heat from the environment, and the refrigerant evaporates into low-temperature gas in the evaporator to absorb heat; Compressed by a compressor to form high-temperature gas, it releases heat into the sludge in the condenser to promote water evaporation, and finally reduces pressure through an expansion valve to circulate again.
The operating temperature is usually ≤ 80 ℃ to avoid the risk of organic matter decomposition or dust explosion.
2. Circulating wind and humidity control technology
Wet air is forcibly discharged from the equipment, while dry air is replenished to maintain a low humidity environment inside the cabin and ensure continuous dehydration efficiency.
Accurately adjust the air volume and temperature and humidity parameters to ensure even heating of the sludge.
3. Anti stick conveying structure
The sludge is evenly conveyed into the drying area by a spiral/belt conveyor and slowly moved to fully contact the hot air.
The hollow shaft blade combination design utilizes the difference in linear velocity to achieve self-cleaning, effectively solving the problem of high viscosity sludge "sticking to the shaft".
4. Closed thermal energy recovery
Fully enclosed operation reduces odor emission, and the waste heat recovery system significantly reduces energy consumption, with energy consumption 40% -60% lower than traditional equipment.
2、 Core application scenarios
1. Municipal and industrial sludge: treating activated sludge from sewage treatment plants, high viscosity sludge from papermaking/printing and dyeing/leather industries, with a moisture content that can be reduced from 90% to 10% -30%.
2. Special hazardous waste disposal: safe drying of hospital sludge, electroplating sludge and other hazardous waste containing heavy metals or pathogens.
3. Organic waste resource utilization: converting kitchen waste and biological fermentation residue into fuel or fertilizer raw materials.
4. Distributed processing requirements: Suitable for small batch sludge reduction scenarios such as laboratories, small factories, or emergency treatment stations.
Technical adaptability explanation: For sludge with high oil content or strong cell walls (such as petrochemical sludge and activated sludge), it is necessary to cooperate with pre-treatment such as wall breaking conditioning to improve drying efficiency.
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