High volume, high rise
Waste gas volumes easily reach tens of thousands of cubic metres per hour with rises above 100 °C, so several heating banks are switched in stages to balance the electrical load.
DIANREZHANELECTRIC HEATINGIndustry Solutions中文INDUSTRY SOLUTION · S2
Waste gas heating
to the duty.
Waste-gas pre-heating and duct boosting before catalytic oxidation. Fix air volume, rise, pressure drop and fan interlocks.
- Waste gas volume (m³/h)
- Inlet / target temperature
- Fan static pressure and duct cross-section
- Gas composition and concentration
- Control method and interlock requirements
SCENARIO
Typical duty
Read the process, then the equipment
Abatement systems in coating, printing and chemical plants must lift ambient or low-temperature waste gas to the temperature catalytic oxidation, RTO or biological treatment needs. The duty is high volume, large temperature rise and continuous running, and the fan and heater must be reliably interlocked so the elements can never run dry.
Pressure drop and flow
Heater bundles add duct resistance and shift the fan operating point; pressure drop must be checked against cross-section velocity with a spare access section.
Corrosive media
The gas may carry acidic or sticky components, so element sheaths and duct walls need corrosion resistance and cleanability.
Safety interlocks
On fan failure or low flow the heating must break before anything else, and over-temperature must stop the unit before the elements overheat.
SOLUTION PATH
From duty to equipment,
four steps
- 01
Verify volume and rise
Size the heat duty from actual volume flow (m³/h) with inlet and target temperature, allowing for leakage and fluctuation, then set installed power and spare margin.
- 02
Match the duct construction
From duct cross-section and velocity fix the heated length, finned-tube layout and flow-straightening, keeping section velocity and pressure drop under control.
- 03
Set staged control
Switch heating groups against the temperature-rise demand and hold outlet temperature with PID or SSR power control.
- 04
Lock in the interlocks
Interlock the fan running signal into the heater circuit, and add over-temperature protection, flammable-gas alarm coupling and supply-failure protection.
RECOMMENDED EQUIPMENT
Equipment directions
FAQ
Common questions
01What pre-heat temperature is needed before catalytic oxidation?+
Light-off temperature depends on the catalyst and commonly sits in the 250–350 °C band; the supplier’s data governs. Size the power from the difference between inlet and target temperature.
02How much pressure drop does the heater add?+
It depends on section velocity and fin density and is normally kept inside a reasonable range. Send the duct cross-section and available fan static pressure and the proposal will state the calculated resistance.
03Can it be split into two banks for duty/standby?+
Yes. High-power installations are commonly built as two or more banks, one running while another is serviced, or switched by load stage to balance uptime and electricity cost.
INQUIRY PREP
Come prepared,
decide faster on Waste Gas & VOC
Have these parameters ready — they feed directly into model selection, power sizing and mechanical design review.- Waste gas volume (m³/h)
- Inlet / target temperature
- Fan static pressure and duct cross-section
- Gas composition and concentration
- Control method and interlock requirements
Other solutions
S1Chemical & process pipeline heatingHeat-up, trace heating and temperature holding for process media. Fix medium, pressure, corrosivity and Ex requirements first.S3Industrial drying & hot airStable hot air for drying rooms, lines and fresh-air systems. Judge velocity, temperature uniformity and staged control.S4Reactor thermal-oil temperature controlIndirect heating and constant control through a thermal-oil loop. Fix the temperature band, circulation rate and heat consumers.S5Tank & liquid heatingLiquid heat-up through flanged immersion elements or an external loop. Watch level, scaling, material and surface load.S6Hazardous-area electric heatingHeating for flammable or explosive atmospheres: zone, Ex level, temperature class, isolation and over-temperature protection.