Infrared heating technology

2024-04-23 12:24:55 21


Infrared light is non visible light with a wavelength longer than red light, ranging from 0.75 to 1000 wavelengths μ m. Commonly known as infrared light. Infrared can be divided into three parts based on the length of the wavelength, namely near-infrared, with wavelengths ranging from 1 to 3 μ M; Mid infrared, with wavelengths ranging from 3 to 40 μ M; Far infrared, with wavelengths ranging from 40 to 1000 μ M.

Any object in nature radiates infrared radiation outward, and the main function of infrared radiation is thermal action. Infrared heating technology is a new drying technology developed based on this characteristic.

The principle of infrared heating technology

Infrared heating technology is a drying method that uses the infrared radiation emitted by infrared radiation elements to be absorbed by materials and directly converted into thermal energy, achieving the purpose of heating and drying. Its essence is the process of infrared radiation heat transfer. Infrared, as an electromagnetic wave, has a certain degree of penetration and can transfer energy through radiation.

After absorbing infrared radiation energy, the material completely converts the radiation energy into the rotational energy of the material molecules or changes the rotational energy of the molecules. Moreover, vibration spectra can increase the amplitude of the vibration or rotation of material molecules, thereby exacerbating their internal vibrations.

Due to the extremely fast motion of electrons and molecular vibrations, the vibrations and collisions of lattice and bond groups between materials are faster, resulting in faster frictional heat generation. Therefore, when using infrared heating, the heating rate of materials is faster. Especially when the radiation frequency of infrared radiation is consistent with the natural frequency of material molecules, a phenomenon similar to resonance will occur, resulting in more intense internal movement of material molecules, faster heating, and thus achieving the goal of rapid drying.

Due to the certain penetrability of infrared radiation, the internal heat of the material continuously accumulates and the temperature rises during infrared heating; The external temperature of the material continuously decreases due to the continuous evaporation and heat absorption of moisture; The material forms a temperature difference from the inside out, so the thermal diffusion process of the material proceeds from the inside out.

In addition, the moisture content inside the material is greater than that outside, and the moisture always diffuses from the inside out. Therefore, the direction of wet diffusion and thermal diffusion of the material is consistent, thereby accelerating the diffusion of water, that is, accelerating the drying process of the material.

The physical characteristics of infrared heating technology

1. Infrared heating tubes have thermal effects, and the heating effect they bring during heating is one of the prominent heating methods among current heating methods.

2. When heated, it has extremely strong heating penetration ability. The heating effect is also very strong when penetrating through clouds and mist. In addition, the heating effect of cloud and mist projection is mainly limited by the wavelength of the heating tube. The infrared wavelength emitted by heating objects with different characteristics is also different. Infrared Z with different characteristics is easily received by objects with the same characteristics, but not by some gases.

3. When infrared heating technology is used for heating and drying, the heat energy it possesses is mainly transmitted through radiation, and the intensity of its amplitude is proportional to the temperature to the power of four.

4. The absorption and capacity of radiated thermal energy are directly proportional to the surface blackness of the heated object.

5. When using infrared heating technology to heat and dry, the thermal conductivity of the heated and dried object is mainly proportional to the temperature gradient. And it is inversely proportional to thermal resistance