Carbon Fiber Heater Tube Designs for Drying Lines

Industrial drying lines, particularly in sectors like large-scale coating factories, food processing plants, and textile printing and dyeing facilities, utilize various types of drying chambers. These are often referred to as drying rooms, drying ovens, or tunnel kilns, with design solutions tailored based on component dimensions and operational experience validated through specific design processes. Today, we share insights into a bridge-type drying line.

Bridge-type drying lines offer several advantages over other forms. They minimize smoke emission at both ends, ensuring cleaner workshop environments. Utilizing air curtain fans for exhaust reduces noise levels. These lines efficiently utilize workshop air, with the horizontal section suspended in mid-air, allowing space underneath for electrical cabinets and toolboxes, thereby optimizing spatial use. However, the extended inclines for preheating and cooling phases increase initial equipment investment, representing a drawback of this design.

Typically, these lines consist of a furnace framework, insulation layers, infrared radiators, and heat-resistant conveyor belts. The framework is usually constructed using angle or channel steel, with insulation thickness ranging from 80mm to 150mm, maintaining a surface design temperature below 50 degrees Celsius. Sections of the drying line are typically 2 meters in length, connected via bolted joints to accommodate installation and thermal expansion.

Infrared radiators for drying lines can include options like carbon fiber heater tubes and tungsten wire infrared heating tubes. Ventilation system design must account for emissions from drying processes, aiming to keep the concentration of flammable vapors below 50% of the explosion limit within the drying chamber. Besides exhaust ports on either side of the chamber, additional vents should be positioned where water and solvent emissions are highest during drying stages to prevent hazardous gas leaks, which could lead to workshop explosions.

Choosing carbon fiber heater tubes involves preliminary simulated experiments to test paint infrared absorption spectra. This determines the optimal wavelength band for carbon fiber heater tubes. Subsequently, radiators are selected based on experimental data. Given the complexity of paint compositions, which often absorb multiple infrared wavelengths, designs must cater to specific needs, selecting either mid-range or high-temperature bands for drying.

Despite meticulous design and uniform distribution of carbon fiber heater tubes, temperature variations persist within drying chambers, with differences of up to 60°C between upper and lower regions. This phenomenon primarily arises from thermal convection within the chamber despite infrared radiation heating from carbon fiber tubes. Segmenting the cross-section into upper, middle, and lower zones with varied densities of heating elements proportionately arranged can effectively mitigate temperature differentials.

In conclusion, optimal design of industrial drying lines, particularly those utilizing carbon fiber heater tubes, demands meticulous consideration of infrared radiation properties, ventilation system efficacy, and spatial utilization to ensure efficient and safe operations in diverse manufacturing environments.

For optimal industrial drying solutions utilizing carbon fiber heater tubes, trust GlobalQT for innovative designs. Contact us via our website for more information or email us at contact@globalquartztube.com.