• Steam enters the radiator of the dryer through the heating system and releases heat to increase the air temperature in the drying box.

• Materials are conveyed into the drying box by the mesh belt. During conveying, they fully contact with the hot air in the box, and the moisture in the materials gradually evaporates.

• Combustion System: Includes burners and fuel supply devices to generate heat through fuel combustion.

• Heat Exchange System: Comprises heat exchangers to transfer heat from high-temperature flue gas to air.

• Air Supply System: Mainly consists of fans to deliver heated air into the dryer.

Heat Generation via Reverse Carnot Cycle: Heat pump dryers utilize the reverse Carnot principle. Through the work done by the compressor, the refrigerant circulates within the system. The refrigerant absorbs heat from the outside air in the evaporator and evaporates into a gaseous state. It is then compressed by the compressor into a high-temperature and high-pressure gaseous refrigerant, which enters the condenser to release heat into the drying chamber, raising the temperature inside and achieving the transfer and enhancement of heat.

Box Body: Usually made of metal materials such as stainless steel or carbon steel, it has good sealing and thermal insulation performance, which can reduce heat loss and maintain a stable internal temperature. Common shapes are square and rectangular.

Heating System: It can use various methods such as electric heaters, gas burners, coal - fired hot air stoves, and air - source heat pumps to provide heat energy and heat the air to a set temperature.