The flue gas treatment air duct heater is an electric heating equipment designed specifically for industrial flue gas heating conditions. It is mainly installed in flue gas pipelines or ventilation ducts, and quickly heats the flowing flue gas to the required temperature through electric heating elements. It is widely used in environmental protection systems such as desulfurization and denitrification, exhaust gas treatment, VOCs treatment, RTO/RCO thermal storage and incineration.
1、 Core structure
Firstly, the heating element adopts 304/316L/310S stainless steel seamless electric heating tube, which is filled with high-purity crystalline magnesium oxide powder and compacted for insulation. The cold insulation resistance is ≥ 1000M Ω, the withstand voltage is ≥ 2000V, and the electrical safety performance is stable.
Secondly, the electric heating tube is wrapped with corrugated stainless steel fins, which increases the heat dissipation area by 5 to 8 times compared to the light tube, enhancing convective heat transfer efficiency. At the same time, it is equipped with optimized flow field design guide plates to ensure that the flue gas flows evenly through the heating surface, reducing local overheating and cold zones.
Thirdly, the equipment casing is fully welded and sealed with thickened steel plates, and an insulation protective layer is laid on the outer layer to effectively reduce heat loss and prevent smoke leakage; The overall modular structure facilitates installation, maintenance, and component replacement.
Fourthly, the control system integrates PID closed-loop regulation and PT100 platinum resistance temperature measurement, with a temperature control accuracy of ± 1 ℃, and is equipped with multiple safety mechanisms such as over temperature protection, fan interlock, and phase failure protection.
2、 Main technical features
Firstly, the heating response is fast, with a heating rate of up to 10 ℃/s, and the power can be adjusted in real-time according to the process load to avoid fluctuations in flue gas temperature.
Secondly, the thermal efficiency is relatively high. By combining fin enhanced heat transfer with low wind resistance flow field design, the thermal efficiency can reach over 95%, which is 15% to 30% energy-saving compared to the light pipe structure.
Thirdly, it has a wide temperature coverage range and can achieve multiple operating conditions including low temperature (≤ 160 ℃), medium temperature (≤ 260 ℃), and high temperature (≤ 600 ℃). The power range can be customized from 10kW to 1000kW.
Fourthly, the electric heating method has no combustion emissions, does not produce secondary pollutants such as sulfur dioxide and nitrogen oxides, and is easy to operate and maintain.
3、 Typical application scenarios
Firstly, the desulfurization and denitrification system of thermal power plants: after wet desulfurization, the flue gas is reheated to avoid white smoke at the chimney outlet; Accurate control of SCR denitration inlet flue gas temperature to ensure catalyst activity.
Secondly, waste gas treatment in the chemical and pharmaceutical industries: preheating the flue gas before VOCs, CO, and RTO devices to improve incineration or catalytic reaction efficiency.
Thirdly, dehumidification and anti condensation of flue gas: Heat the flue gas above the dew point to prevent condensation corrosion and dust adhesion blockage on the inner wall of the flue.
Fourth, industrial drying and drying system: providing a stable hot air source for the drying process.
4、 Key selection points
Firstly, clarify the composition and corrosiveness of the flue gas, and based on this, select heating tube materials such as 304, 316L, or 310S.
Secondly, provide flue gas flow rate, inlet and outlet temperatures, working pressure, and duct size for calculating heating power and flow field design.
Thirdly, confirm whether explosion-proof level, protection level, and special control protocol (PLC/DCS docking) are required.
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Post time: Sep-15-2026
