Low-temperature harmless solid waste drying machine

Working Principle

• Heat Pump Closed-Cycle Dehumidification Technology: Utilizes a refrigeration system to cool and dehumidify humid air, while recovering the latent heat of condensation from the air's moisture through the heat pump principle. It employs hot air circulation for condensation, dehumidification, and drying of sludge. For example, the Weilinfesi Low-Temperature Sludge Dehumidification Heat Pump Drying Machine uses this method to achieve energy recovery by circulating humid air in a closed loop between the drying chamber and the dehumidification dryer.
• Mechanical Deep Dewatering Technology: Reduces moisture content to below 60% through physical pressing combined with chemical modification. For instance, the Weilinfesi 9600 series equipment adopts a combined process of "sludge modification and cell wall disruption + mechanical pressing." The sludge modification machine breaks down the cell wall structure, destabilizes colloids, and converts bound water into free water. This is followed by an S-shaped pressing dewatering process, which uses the tension of the filter belt and the diameter difference of rollers to create gradient pressure, achieving deep pressing dewatering.
• Disc-Type Drying Technology: The dryer mainly consists of hollow disc rotors and a jacketed stator. Moist sludge is fed into the gap between the sealed rotor and stator through the inlet. Low-pressure saturated steam enters the hollow discs of the combined hollow shaft via steam pipelines. Indirect heat exchange occurs through the hollow discs, and the thorough stirring and propulsion by the hollow rotor rapidly evaporate the moisture in the sludge, pushing it toward the discharge port.

Features

• High Efficiency and Energy Savings: For example, the Weilinfesi third-generation pulse dust removal low-temperature dryer achieves a heat recovery utilization rate of over 80%. Drying one ton of sludge from 80% moisture content to 10% requires only 200 kW·h of electricity, with a dehumidification performance ratio of 1:4 kg H₂O/kW·h.
• Environmental Safety: The fully sealed system design prevents odor leakage, and condensate water can be discharged directly without additional deodorization equipment. It operates at low temperatures (40-75°C), with oxygen content during drying below 12%, dust concentration below 60 g/m³, particle temperature below 70°C, and no dust emission.
• Significant Volume Reduction: Can dry sludge from 83% moisture content to 10%-30%, achieving a volume reduction of over 75%. The dried sludge can be used for gasification, co-firing, incineration, biofuel production, greening soil, or as a recyclable material for cement or construction raw materials.
• Easy Operation: Equipped with an intelligent control system, such as PLC + touch screen control, enabling remote centralized control. It is simple to operate, easy to maintain, and capable of fully automatic operation, significantly reducing labor costs.
• Strong Adaptability: The equipment can be flexibly customized based on processing capacity and site constraints, supports modular assembly, saves over 50% of space, reduces investment costs by 40%, and can handle various types of organic waste, including municipal and industrial sludge.