What are the design principles and working principles of industrial tunnel furnaces?

What are the design principles and working principles of industrial tunnel furnaces?

Industrial tunnel furnace is a device used for heating objects, mainly used in various heat treatment processes, calcination, melting, drying and other processes. Its design and working principle basically follow the following basic principles:

Design principle:

Structural design: The structure of an industrial tunnel furnace generally consists of a furnace body, heating system, control system, and peripheral auxiliary equipment. The furnace body is usually rectangular or cylindrical, with heating elements and a conveying system for working items inside. The control system is used to control the heating temperature, time, and maintain stable operation.

Material selection: The materials used in industrial tunnel furnaces must have characteristics such as heat resistance, corrosion resistance, and insulation. Common materials include furnace body materials (furnace, furnace door), insulation materials (insulation layer outside the furnace), and heating element materials (such as resistance wires, refractory materials, etc.).

Heat exchange principle: Industrial tunnel furnaces mainly transfer heat to working objects through conduction, heat transfer, and radiation. Conduction refers to the transfer of heat through direct contact between objects, while heat transfer refers to the convective transfer of heat through fluid media such as air, gas, or liquid. Radiation refers to the transfer of heat through thermal radiation, which can occur in a vacuum.

Heating system: The heating system of industrial tunnel furnaces usually uses electric resistance wires or burners as heat sources. Electric resistance wire converts energy into thermal energy through electrical energy, and the heat is transmitted to the working object through conduction and radiation. The burner mixes fuel with air and ignites it to form a flame. The heat of the flame is transferred to the working object through convection and radiation.

Control system: The control system of industrial tunnel furnaces usually consists of temperature control devices, time control devices, and safety devices. The temperature control device controls the working status of the heating system by sensing the temperature changes inside the furnace. The time control device is used to set and control the working time inside the furnace. The safety device is used to detect and prevent accidents such as high temperature and pressure inside the furnace.

Work item conveying system: Industrial tunnel furnaces usually use conveyor belts or rollers to transport work items. Conveyor belts are usually made of heat-resistant materials and can withstand high temperatures and weight. Work items enter the furnace chamber through a conveyor belt or roller conveyor from the furnace door, and then undergo heating treatment or other process operations in the furnace chamber before leaving the furnace chamber outlet.

In summary, the design and working principles of industrial tunnel furnaces mainly involve technical elements such as structural design, material selection, heat transfer principles, heating systems, control systems, and work item conveying systems. Through reasonable design and operation, industrial tunnel furnaces can achieve safe and stable heating and treatment processes, meeting the needs of industrial production.

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