Operating principle Low-pressure catalytic systems
First of all, the exhaust air from the production process is heated by an air-to-air heat exchanger. The air is then heated further using a burner, thermal oil, or steam until it reaches the operating temperature of the catalyst. In the catalyst the complex hydrocarbons are converted to substances with a simple structure at a temperature of 300 to 350°C. Oxidation causes the hydrocarbons to break down into carbon dioxide and water.
The heat generated during the conversion of the VOCs is transferred to the untreated exhaust air from the production process via an air-to-air heat exchanger.
If the VOC concentration is so high that more energy is produced than is needed for the reaction, the excess heat can bypass the heat exchanger and be taken directly into the chimney without being used.
In autothermal operation the required inlet temperature is achieved by pre-heating the exhaust air in the heat exchanger. As a result, the support burner does not need to provide any additional heat. If the system is not operating in autothermal mode, the support burner is needed to bring the exhaust air to the required temperature.
The inlet, catalyst, and final temperatures are measured and monitored. If the maximum operating temperature of the catalyst is exceeded, fresh air is added to reduce the pollutant burden and therefore the temperature.
