Low temperature heat pump vacuum paddle dryer for sludge
- Category: Vacuum Drying Equipment >>>
- Supplier: Changzhou Doing Machine Co. Ltd.
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Product Overview
Description
Product Description
Main features
1. Used for thermal drying of various kinds of sludge/biosolids under vacuum condition;
2. Heating area: 10-300 M2
3. Volume of drying chamber: 500-25000 L
4. Working type: Batch type or continuous
5. Heat source: 65-85 ℃ hot water
Working Principle
PZG series Vacuum Paddle Dryer is specially designed for drying various kinds of sludge or biosolids with low temperature. 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 condenser.
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.
Technical advantages
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 waste heat in the vapor can be recycled by the heat pump to further reduce heat consumption.
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 paddle dryer can work both in batch or continuous operation to satisfy different working conditions.
Main technical parameters
Model | PZG-600 | PZG-1000 | PZG-2000 | PZG-4000 | PZG-6000 | PZG-8000 |
Volume L | 600 | 1000 | 2000 | 4000 | 6000 | 8000 |
Working volume L | 420 | 700 | 1400 | 2800 | 4200 | 5600 |
Heat transfer area M2 | 6 | 10 | 20 | 40 | 60 | 80 |
Evaporation rate kg/M2/hr | 6-10 | 6-10 | 6-10 | 6-10 | 6-10 | 6-10 |
Working temp. oC | 60-280 | 60-280 | 60-280 | 60-280 | 60-280 | 60-280 |
Vacuum degree Pa | 300-1500 | 300-1500 | 300-1500 | 300-1500 | 300-1500 | 300-1500 |
Detailed Images
Tubular heating jacket
1) Heating jacket working pressure can each 0.9 Mpa
2) Vacuum degree can reach 500 Pa. 3) Tubular heating jacket can insure very uniform heating
4) 80mm mineral insulation to considerably prevent hot loss
Hollow disc
1) Considerably increase heating surface
2) Much less welding area than other types of paddles
3) Self-cleaning disc surface can considerably enhance heat transfer
4) Small paddles welded on discs with different angle and quantity can perfectly mix and move wet materials
Integral beating seat and mechanical sealing
1) Bearing seat is mounted on end plate as an integral part of drying chamber to ensure the concentricity of shaft.
2) Water cooling jacket is equipped to increase the life-span of bearing.
3) Double-end mechanical seal is used to ensure high vacuum degree.
Vapor recovery system
The vacuum system consists of two-stage tubular condenser, separator and oilless roots vacuum pump to guarantee high vacuum degree (10 bars) and recovering rate (98%).
Installed projects
PZG-6500 vacuum paddle dryer in Hungary
PZG-8000 vacuum paddle dryer in Poland
PZG-2000 vacuum paddle dryer in Korea
PZG-8000 vacuum paddle dryer in China
PZG-8000 vacuum paddle dryer in China
PZG-8000 vacuum paddle dryer in Canada
Our factory
FAQ
Q: What information should be provided in order to get a proposal or quotation?
A: Our rotary vacuum paddle dryer is specially designed for each customer according to specific wet material, capacity, drying temperature and heat mediums. Before we can work out a detailed proposal, we have to know the following information:
1) Detailed information of wet material you are going to dry. We may ask you to provide composition report or samples for drying test.
2) Type of moisture.
3) Initial moisture content before drying
4) Required moisture content in dried product
5) Drying capacity in kg/h
6) Heat medium to be used for drying. Such as steam, thermal oil or hot water
Q: How the machine is delivered ?
A: Rotary vacuum paddle dryer is very heavy and its weight ranges from 3 tons to 50 tons. When the heating area is less than 60 M2, the dryer body can be shipped by 40 feet HQ container; 60-100 M2 should be shipped by 40 feet OT container; more than 100 M2, the dryer body has to be dismantled for shipping.
Q: What kind of after sale service you can provide?
A: We have professional after sale service team who can reach you in short notice. They can supervise the installation, do commissioning and train your workers.
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