ELECTRIC AIR & PROCESS GAS HEATERS
Electric Flue Gas Heater
Custom electric flue gas heating equipment for emission systems, process temperature control and condensation prevention.
The Electric Flue Gas Heater is used to increase or maintain flue-gas temperature in industrial emission ducts or closed gas lines where downstream equipment, draft conditions or condensation control require a defined temperature.
The design can be customized from gas volume, dust loading, moisture, corrosive components, inlet and outlet temperatures, operating pressure and allowable pressure drop. The supply can include the heater, insulation, instruments and control cabinet.
Product Overview
The Electric Flue Gas Heater is an industrial heating section installed in a flue-gas duct or pipeline to raise gas temperature before emission-control equipment, stack discharge, heat-recovery equipment or other process stages.
A typical unit includes a fabricated casing or shell, electric heating element bank, support structure, terminal enclosure, insulation, temperature sensors and duct or flange connections. Cleaning and inspection access can be included where required.
Compared with an Electric Duct Heater for clean ventilation air, a flue-gas heater must consider dust, ash, moisture, acid dew-point risk, corrosion and fouling. These factors affect element arrangement, material selection, element watt density and maintenance access.
Xiangyuan Machinery can supply a standalone flue-gas heater, a heater with an independent control cabinet, or a coordinated section for an industrial emission or process-gas system.
Key Features
The Electric Flue Gas Heater can be engineered around the actual medium, duty, installation and control requirements of the project.
Flue-Gas Duty Calculation
Heating capacity is selected from gas volume, composition, inlet temperature and target temperature.
Duct or Pipeline Integration
Casing and connections can be adapted to the existing flue, transition section or pressure-bearing line.
Dust and Fouling Consideration
Element spacing and flow arrangement can be adjusted for ash, particles and cleaning access.
Condensation Control
The heater can maintain a specified gas temperature where dew-point margin is part of the process requirement.
High-Temperature Material Options
SS310S, Incoloy and selected alloys can be evaluated for elevated-temperature service.
Control and Interlock Integration
Temperature, draft, flow and downstream-system signals can be included in the control logic.
Typical Technical Parameters
The following parameters are for reference only. Final design is confirmed according to the operating medium, temperature, dimensions and project requirements.
| Parameter | Customizable Range or Options |
|---|---|
| Product Name | Electric Flue Gas Heater |
| Heating Medium | Industrial flue gas or combustion-related process gas |
| Heating Power | Custom engineered from gas flow and temperature rise |
| Temperature Range | Customized according to process, materials and gas composition |
| Working Pressure | Normally atmospheric or low pressure; pressure-bearing design where required |
| Gas Flow / Pressure Drop | Selected from actual system data and fan capability |
| Casing Material | Carbon steel, SS304, SS316L, SS310S or selected alloy |
| Heating Element Sheath Material | SS304, SS310S, Incoloy 800/840 or selected alloy |
| Installation | Duct-mounted, inline, horizontal, vertical or customized transition section |
| Control Method | PID, SCR, staged control, PLC or DCS interface |
| Explosion-Proof Option | Explosion-proof terminal enclosure and matched electrical configuration; Relevant explosion-proof products have obtained Chinese explosion-proof certification Ex db IIC T1–T6 Gb. |
| Protection Options | Independent over-temperature limit, fan or draft interlock, differential-pressure monitoring, ground-fault protection, protective grounding and emergency stop |
| Optional Design | Inspection door, cleaning access, insulation, drainage and customized maintenance access |
Structure, Materials, Control and Safety
Structure of the Heater
The flue-gas heater can use a rectangular duct-type casing or a cylindrical inline shell depending on the existing system. Electric elements are arranged to provide uniform exposure to the gas stream while controlling pressure drop and allowing maintenance.
The structure can include element support frames, removable element banks or flanged bundles, inspection doors, drain points, temperature ports, differential-pressure connections, insulation and external cladding.
For dusty or fouling gas, the design should provide suitable spacing and access. The gas direction, local velocity and element surface temperature are coordinated to reduce local deposition and overheating.
Materials and Customization
Casing and heating-element materials are selected from gas temperature, oxygen content, moisture, sulfur or chlorine components, ash and expected dew-point conditions. Carbon steel can be used where suitable; stainless steels and selected alloys are available for more demanding duties.
Insulation and external cladding can be selected to limit heat loss and protect personnel. Seals and terminal arrangements are matched to the operating temperature and site environment.
The customer should provide gas analysis or available process data so material selection is based on the actual service rather than a generic flue-gas description.
Control System
Outlet flue-gas temperature is normally controlled through PID and SCR or staged power regulation. The control system can operate locally or communicate with the customer’s PLC or DCS.
Optional monitoring includes inlet temperature, outlet temperature, element sheath temperature, draft or differential pressure, fan status and downstream equipment readiness.
The sequence can require confirmed fan or draft operation before energization, reduce power when flow decreases and provide alarm or shutdown when temperature or pressure conditions exceed limits.
Safety Protection
Typical protection includes independent over-temperature cutoff, fan or draft interlock, differential-pressure or flow monitoring, ground-fault protection, protective grounding and emergency stop.
For gas containing dust or condensable components, inspection and cleaning intervals should be included in the operating plan. Accumulated deposits can reduce heat transfer and raise local element temperature.
For hazardous-area applications, explosion-proof terminal enclosures and matched electrical configurations are available. Relevant explosion-proof products have obtained Chinese explosion-proof certification Ex db IIC T1–T6 Gb. The final configuration is confirmed according to the site classification and actual operating conditions.
Typical Applications
Typical applications for the Electric Flue Gas Heater include flue-gas temperature control, condensation prevention and emission-system heating duties. Final selection should be based on confirmed process data.
Emission Duct Heating
Raising flue-gas temperature before stack or emission-control equipment.
Condensation Prevention
Maintaining temperature above a required dew-point margin in industrial flues.
Desulfurization / Denitrification Support
Providing a specified gas temperature before selected treatment processes.
Heat-Recovery Systems
Adjusting flue-gas temperature around recovery or downstream process equipment.
Industrial Furnaces
Supplementary heating for furnace exhaust or process-gas sections.
Boiler Flue Systems
Temperature adjustment in suitable boiler-related flue-gas duties.
Dryer Exhaust Systems
Heating or maintaining exhaust temperature in industrial drying lines.
Process Equipment Packages
Integrating a flue-gas heating section into environmental or thermal-process equipment.
How to Select the Right Electric Flue Gas Heater
Please provide the following information so Xiangyuan Machinery can select and design the Electric Flue Gas Heater for the actual operating conditions.
Gas Flow
Provide normal, minimum and maximum flue-gas volume or mass flow.
Gas Composition
List moisture, oxygen, sulfur, chlorine, dust and other known components.
Inlet Temperature
State normal, start-up and minimum inlet temperatures.
Outlet Temperature
State required temperature and allowable deviation.
Pressure / Draft
Provide operating pressure, fan data and allowable pressure drop.
Dust Loading
Describe ash, particles, fouling tendency and cleaning method.
Dew Point
Provide known acid or water dew-point information where relevant.
Materials
State required casing, element, cladding and insulation materials.
Connection Size
Provide duct or flange dimensions and installation orientation.
Control Signals
Define local control, PLC/DCS interface and interlock requirements.
Site Classification
Provide hazardous-area information where applicable.
Maintenance Access
State available removal direction and inspection space.
Frequently Asked Questions
Common questions about Electric Flue Gas Heater selection, customization and industrial use.
What is an Electric Flue Gas Heater?
What information is required for design?
How is it different from an Electric Duct Heater?
Can it help prevent condensation?
How is an Electric Flue Gas Heater different from an Electric Exhaust Gas Heater?
Can high-temperature or explosion-proof options be supplied?
Why Choose Xiangyuan Machinery
Xiangyuan Machinery designs and manufactures industrial electric heaters, heating elements and control systems for customized process conditions. The Electric Flue Gas Heater is engineered around the customer’s medium, thermal duty, installation limits and safety requirements.
Thermal & Material Engineering
Thermal design based on actual inlet conditions, target temperature and operating duty. Material selection matched to the medium, temperature, pressure and site environment.
Flexible Mechanical Arrangement
Flexible power, connection, installation and maintenance-access arrangements.
Control & Safety Integration
PID, SCR, staged control, PLC, HMI and remote interface options where required. Product-specific temperature, flow, pressure, level or electrical interlocks can be integrated.
Complete Project Supply
Supply scope can include the heater, control cabinet, instruments and related system components. Manufacturing inspection, electrical testing and technical documentation can be prepared according to project scope.
Tell Us Your Flue Gas Heating Conditions
Send the medium, flow rate, inlet and outlet temperatures, operating pressure, power supply, installation dimensions, control method and site requirements. Xiangyuan Machinery will prepare a suitable technical proposal and quotation.