Lechler's scrubber and quench systems are types of air pollution control technologies used to reduce emissions from industrial processes.

A scrubber system, also known as a gas scrubber or an air scrubber, is designed to remove pollutants from exhaust gas streams. The process involves passing the gas stream through a liquid (usually water) which absorbs or reacts with the pollutants. The scrubbing liquid can be sprayed or circulated in a variety of ways to ensure effective gas-liquid contact. The resulting waste stream is then treated to remove or recover the pollutants before being discharged or recycled. Scrubbers can be used to remove a wide range of pollutants including particulates, sulfur dioxide (SO2), nitrogen oxides (NOx), and volatile organic compounds (VOCs).

A quench system, on the other hand, is designed to cool high-temperature gas streams to prevent the formation of certain pollutants such as nitrogen oxides. The quench process involves injecting a liquid (usually water) into the hot gas stream, causing the temperature to rapidly drop. This can help to prevent the formation of pollutants by reducing the reaction time and temperature of the exhaust gas. Quenching can also help remove certain pollutants, such as heavy metals, by condensing them onto the liquid droplets. The resulting waste stream is then treated to remove or recover the pollutants before being discharged or recycled.

So, which system will work best for your application? Scrubbers are generally more effective at removing a wider range of pollutants, but can be more complex and expensive to install and maintain. Quench systems are simpler and more cost-effective, but may not be as effective at removing all types of pollutants. Ultimately, the choice between the two will depend on the specific requirements of the application and the pollutants that need to be removed.