Quenching

Once the dust has been removed in the hot gas cleaning process, the gas is adiabatically cooled down to the saturation temperature in a quench stage. The gas outlet temperature depends on the water content of the gas at the inlet as well as on the acid concentration in the quench liquid.

Depending on the impurities and their concentrations, a quench tower followed by a scrubber is used. Alternatively, the gas can be quenched and simultaneously scrubbed using a Venturi quench scrubber. The gas is accelerated in the throat of the quench Venturi scrubber. Due to the intense contact between the scrubbing liquid and the accelerated gas, impurities are thus scrubbed out of the gas.

Outotec offers three options of proprietary equipment for the quenching phase of your gas cleaning system:

• Outotec Otovent
• Outotec Quencher
• Classic quenching tower