What heat sources are generally used in tunnel drying equipment?
 The heat source of the tunnel dryer can be used: exhaust gas, steam heating air, flue gas or electric heating air. The flow direction can be divided into: natural circulation, one or more cycles, and intermediate heating and multi-stage recycling. Among them, the natural circulation is unreasonable, because the material stays in the equipment for a long time, which will affect the quality of the product and consume heat. The main advantage of multi-stage recycling is the high economy. Regardless of the longitudinal airflow, the lateral velocity of the air can be increased, the drying effect is better, and the purpose of uniform and rapid drying is achieved. In such drying equipment, the circulation of air in each section is mostly achieved by means of a blower provided in the apparatus. This internal blower reduces air resistance. Therefore, it is allowed to operate at atmospheric levels.
In recent years, a countercurrent and parallel flow operation process has been employed in tunnel drying equipment. For many materials, if only countercurrent operation is used, local condensation may occur, which may affect product quality. If only the cocurrent operation is used, the drying process starts smoothly, but at the end of the drying process, the drying strength is lowered.
　　
In addition, there are also trolleys that are hung on a monorail or hung on a special flat car. The door of the tunnel drying equipment must be tight. It can be designed according to the size of the workshop and the opening, double-turn, push-pull or lift. For push-push or lift doors, the transfer or steering car can be placed close to the drying equipment, but there is room for one or two cars to be placed when the door is opened.
　　
What heat sources are generally used in tunnel drying equipment?
　　
The heat source of the tunnel dryer can be used: exhaust gas, steam heating air, flue gas or electric heating air. The flow direction can be divided into: natural circulation, one or more cycles, and intermediate heating and multi-stage recycling. Among them, the natural circulation is unreasonable, because the material stays in the equipment for a long time, which will affect the quality of the product and consume heat. The main advantage of multi-stage recycling is the high economy. Regardless of the longitudinal airflow, the lateral velocity of the air can be increased, the drying effect is better, and the purpose of uniform and rapid drying is achieved. In such drying equipment, the circulation of air in each section is mostly achieved by means of a blower provided in the apparatus. This internal blower reduces air resistance. Therefore, it is allowed to operate at atmospheric levels.
　　
In recent years, a countercurrent and parallel flow operation process has been employed in tunnel drying equipment. For many materials, if only countercurrent operation is used, local condensation may occur, which may affect product quality. If only the cocurrent operation is used, the drying process starts smoothly, but at the end of the drying process, the drying strength is lowered.
　　
In addition, there are also trolleys that are hung on a monorail or hung on a special flat car. The door of the tunnel drying equipment must be tight. It can be designed according to the size of the workshop and the opening, double-turn, push-pull or lift. For push-push or lift doors, the transfer or steering car can be placed close to the drying equipment, but there is room for one or two cars to be placed when the door is opened.
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