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IGS - Electrically Heated Regenerative Thermal Afterburning (Electric RNV, Electric RTO)
In the fight against climate change, exhaust air and exhaust gas cleaning systems such as RTO/RNV systems play an important role by effectively eliminating climate-damaging pollutants from the exhaust air of a wide variety of production processes. However, the oxidation chambers of many RTO/RNV systems are often heated with natural gas, which can have a negative impact on the CO2 balance. An electric RTO/RNV with electric heating registers enables the use of electricity from 100% renewable energies instead of fossil fuels and thus significantly optimizes the CO2 balance. The current global situation in terms of rising gas costs and impending gas shortages is also contributing to the increased demand for this technology.
- Autothermal operation from approx. 1-2 g/Nm³ pollutant concentration
- Gas burner system available instead of electric heating register
- Robust process, not susceptible to otherwise problematic substances such as catalysts, aerosols, deposits from components in the exhaust air, etc.
- burnout system for cleaning deposits
- Stepless control of the oxidation temperature via electric heating register
- Extraction of energy (hot bypass) for waste heat recovery and adaptation to high pollutant concentrations above 5-6g/Nm³
- Injection of small amounts of pollutant liquid into the combustion chamber
- Simple operation and fully automatic operation
- Safe compliance with the clean gas limit values according to TA-Luft
- Optimized consumption balance, since, in contrast to a gas burner system, no combustion air is required
RNV 2-chamber system
Minimal design variant of an RNV plant.
Compact design consisting of 2 reactor chambers which are connected via a common oxidation chamber.
The switching process of the valves results in small pollutant peaks in the clean gas, which make it difficult to comply with the tightened emission limits of < 20 mgC/Nm³ from the TA Luft (2021). The 2-chamber variant can often only be used at correspondingly low pollutant concentrations or when other emission limits apply.
RNV 2-chamber system with purge air buffer
Extension of the 2-chamber system by a special container with its own valve control for the targeted absorption (buffer) of the pollutant peak and return to the exhaust air stream before entering the RNV system.
This makes the system suitable for higher concentrations and the strictest emission limits < 20 mgC/Nm³. There are only restrictions for very large volume flows, due to the size of the purge air buffer tank.
RNV 3-chamber system
Largest design variant of an RNV plant, consisting of 3 reactor chambers and a connecting oxidation chamber. Pollutant peaks from valve switching processes are effectively eliminated by programmed flushing cycles using the 3rd chamber.
Suitable for large exhaust air volume flows without restrictions regarding pollutant concentrations or legally specified emission limits.
Can also be equipped with 4-5 reactor chambers for very large exhaust air volume flows >50,000 Nm³/h.
2-chamber system for cleaning exhaust gas with carbonization products from a pyrolysis process
exhaust air volume:
~400 Nm³/h
exhaust air temperature:
330°C
Pollutants:
Carbon monoxide (CO) and various short-chain hydrocarbons (VOCs)
3-chamber system for cleaning exhaust air from a paint shop in the automotive sector
exhaust air volume:
~13,000 Nm³/h
exhaust air temperature:
25 – 50 °C
Pollutants:
Short-chain hydrocarbons (VOCs) from paint products