Quenching means the rapid cooling of a hot gas (up to 1,400°C) in direct contact with water, ideally to its wet-bulb temperature. If required, air or an inert gas also be used to improve cooling and the cooling application.

To ensure fast quenching in a jet scrubber, optimum water atomisation, motive pressure, and water quantity (motive medium) in relation to the gas flow to be cooled (suction medium) are very important.

The design of a jet scrubber’s head is often modified, especially at temperatures of >250 °C. The goal is to provide optimum protection of the material used against excessively high temperatures and to prevent caking in the hot and dry transition section to the wet and cool section due to dust, product precipitation or condensation effects of the suction media used.