The main components of the low-temperature sludge dewatering and drying integrated machine are:

Stacked screw sludge dewatering machine/belt sludge dewatering machine+low-temperature sludge drying machine

Jiangsu Boyi Environmental Protection Technology Co., Ltd. and Xi'an Jiaotong University have jointly developed a complete set of intelligent low-temperature sludge drying technology, which has achieved fruitful results. They have successively launched sludge dewatering and drying integrated machine models such as sludge low-temperature belt dryer, sludge low-temperature waste heat dryer, and sludge low-temperature box dryer, with advanced technology and significant treatment effects. Two invention patents have been applied for.

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Patent Name: Sludge Heat Pump Drying Airflow Optimization System Patent Name: Exhaust Drainage Sludge Drying System Based on Heat Pump Technology

The sludge dewatering and drying integrated machine equipment innovatively developed by Boyi Environmental Protection can directly dry sewage or sludge with a moisture content of less than 83% to dry sludge with a moisture content of 10% -30%, with a reduction of up to 90% and effective sterilization of up to 90%. Low energy consumption, pollution-free, widely used for drying and reducing municipal and industrial sludge (printing and dyeing, papermaking, electroplating, chemical, leather, pharmaceutical, etc.). Dry sludge with a moisture content of 10% -30% can be gasified, co burned, composted, or used as building materials for harmless resource disposal in the later stage.

Low temperature drying principle

The low-temperature sludge drying equipment utilizes the principle of low-temperature heat pump dehumidification and uses convective hot air drying to reduce the amount of wet sludge on the mesh belt. The entire equipment is designed to be fully enclosed, and the drying hot air has no heat loss.

Principle of dehumidification heat pump

Using a refrigeration system to cool and dehumidify the humid air from the drying room, while recovering the latent heat of moisture condensation to reheat the dried air, is a combination of dehumidification (dehumidification and drying) and heat pump (energy recovery), which is the recycling of energy during the drying process.

Product advantages

1、 Wide applicability

1. It can be widely applied to the drying treatment of various types of sludge, such as municipal, printing and dyeing, papermaking, electroplating, chemical, leather, etc;

2. The daily dehumidification and water removal capacity of a single device ranges from 200 kilograms to 50 tons, and all models can meet the requirements;

3. Electricity can be used directly, as well as energy sources such as steam and waste heat;

4. It can be "centralized treatment" or "decentralized disposal" to meet the requirements of sludge disposal policies in different regions;

5. Not affected by external environmental temperature (low temperature in winter) and humidity (humid in summer), suitable for use in various regions;

2、 Efficient reduction

1. It can directly dry sludge with a moisture content of 83% to 10% without the need for segmented disposal;

2. The drying process results in no loss of organic components, high calorific value of dry materials, and is suitable for later resource utilization;

3. The reduction can be as high as 80% or more, which can save a lot of transportation costs in the later stage;

4. Adopting the Pasteur sterilization method - low-temperature heating sterilization, drying temperature above 70 ℃ for 90 minutes to 120 minutes, with an effective sterilization rate of over 90%;

3、 Energy saving design

1. Adopting heat pump heat recovery technology, the closed drying mode has no waste heat emissions;

2. Drying 80% wet mud to 60% per ton, with a comprehensive electricity consumption of 125kw. h;

3. Drying of 80% wet mud to 10% per ton, with a comprehensive power consumption of 200kw/h;

4. Each 1 kWh of electricity can remove 4 kilograms of water (dehumidification performance ratio 1:4kg) H2o/kw.h);

4、 Safe and harmless

1. Fully enclosed 40-75 ℃ low temperature operation, no need to charge nitrogen for operation;

2. The oxygen content during the drying process is less than 12%, the dust concentration is less than 60g/m3, the particle temperature is less than 70 ℃, and there are no dust or explosion hazards;

3. Static spreading of sludge without mechanical static friction with the contact surface;

4. There is no "adhesive phase" stage in the drying process of urban sludge (about 60%);

5. The dry material is in granular form and poses no dust hazard;

6. Low discharge temperature (<50 ℃), no need for cooling, direct storage;

5、 Environmentally friendly and odorless

1. The entire equipment system adopts a closed design, with no odor leakage and no need to install complex deodorization devices;

2. By adopting a low-temperature drying process, the precipitation of H2S and NH3 is greatly reduced;

3. The disposal of condensate water (sludge moisture) is simple and can be discharged directly;

4. Adapt to sewage treatment plants in urban areas, rural areas, and scenic spots;

6、 Economic savings

1. Small footprint, with an average processing area of about 4m2 per ton of wet mud;

2. Can be installed in the basement to save land area;

3. No complex civil engineering structures or infrastructure construction, saving civil engineering costs;

4. Equipment installation is simple, with short installation and debugging cycles, saving time and costs;

7、 Intelligent operation

1. The equipment operates fully automatically, saving a lot of labor costs;

2. PLC+touch screen "intelligent control, which can achieve remote centralized control;

3. The moisture content of the discharged material can be adjusted arbitrarily (10% -50%);

8、 Stable and durable

1. Using corrosion-resistant materials such as stainless steel and electroplating anti-corrosion treatment for heat exchangers, with a long service life;

2. No mechanical wear during operation, with a service life of over 15 years;

3. No vulnerable or consumable parts, easy to use and manage;