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Heat Pump Sludge Dryer

Views: 40     Author: Stone Chen     Publish Time: 2021-09-14      Origin: Site

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Our PZG series Vacuum Paddle Dryer is specially designed for drying various kinds of sludge under high vacuum condition. The dryer consists of a jacketed cylindrical drying chamber and a single shaft welded with hollow discs. Both drying chamber jacket and hollow discs are filled with heating medium, such as hot water, hot thermal oil or steam, to form heating surface. The small paddles/blades welded on the discs with different angles can completely mix and regularly move the wet materials with the shaft rotation for uniform heat transfer. The evaporated moisture is sucked out by the vacuum pump after going through the air-liquid separator and tubular condensor. 

The high vacuum can considerably reduce the water boiling point, which is the basic principle of vacuum drying. Our PZG series vacuum paddle dryer can work with 65-85 ℃ hot water from heat pump. Meanwhile,  waste heat in vapor can be recycled by the heat pump to further reduce heat consumption. 

Working principle

Our Vacuum Paddle Dryer with hot water heat pump has been increasingly used for drying sewage sludge, industrial sludge, organic waste, fishmeal, feather meal etc, due to the following overwhelming advantages: 

1. Low temperature drying: The vacuum degree can reach as high as 500 pa, under which the water boiling point is only 45 ℃. The evaporation rate can still reach 6-8 kg water/hr/M2 when use 65 ℃ hot water for drying. 

2. Super low energy consumption: The average heat consumption to evaporate 1 kg water is about 600 kcal due to high vacuum drying condition, large heating surface and little heat loss. Most of the waste heat in vapor can be recycled by the heat pump to further increase heat efficiency. 

3. Almost zero-emission: The drying process conducts in a completely sealed system and the evaporated moisture is trapped by air-liquid separator and tubular condenser to prevent emission. 

4. Batch or continuous operation: Our vacuum disc paddle dryer can work both in batch or continuous operation to satisfy different working conditions. 


Continuous PZG-8000 dryer


Continuous PZG-600 dryer


Sewage sludge drying plant


Electroplated sludge drying plant







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