Dürr has a comprehensive range of systems that use thermal processes for Air Pollution Control and is specially designed to meet customers' requirements. The thermal processes are based on the separation principle and use combustion to remove pollutants from exhaust air. This involves converting the pollutants in exhaust air into non-hazardous substances at specific temperatures, which allows the air to be purified.
The only condition for the use of thermal oxidation is that the pollutants must be flammable. The pollutants in the process exhaust air can be in the form of mist, steam, or gas.
A mixture of air and one or more flammable pollutants is converted using a supply of energy. The exhaust air is heated to such a high temperature during the combustion process that the hydrocarbons it contains combine with oxygen to produce steam and carbon dioxide.
Many of our customers use this type of Air Pollution Control System because the different variants available make it suitable for a wide variety of applications. The range includes special compact designs and systems that can operate in autothermal mode, so that no external energy supply is needed to purify the exhaust air. Systems that use thermal processes to incinerate pollutants are found in almost all areas of industry.
These systems fall into two basic groups: either recuperative or regenerative, depending on the pre-heating method used.
Recuperative thermal Air Pollution Control Systems (Ecopure® TAR) are particularly suitable where there are high concentrations of organic pollutants in the exhaust air. The only disadvantage of this type of system is the relatively high consumption of primary energy, in particular where pollutant levels in the exhaust air volume flow are low. For this reason, operators of Ecopure® TAR systems always rely on downstream energy recovery units to make their systems more cost-effective.
The Ecopure® VAR is a special variant which is ideal for the combustion of critical substances, such as explosive, toxic, and carcinogenic pollutants.
The Ecopure® RTO regenerative thermal oxidation system is not affected by this problem. In the regenerative method, the combustion energy pre-heats the incoming exhaust air. This allows the system to operate in autothermal mode with no external energy being used for the burner.
As well as complete plants, Dürr supplies additional equipment that can be retrofitted to existing systems. The Ecopure® COM burner makes the ideal addition to an Air Pollution Control System.