This patent is involved in a quencher applicable for the Ascontaining offgas cooling during the pyrometallurgy of the nonferrous metals. The new quencher is based on the air direct cooling without more moisture in the offgas to ensure the system kept in good dedusting environment and also to reduce the water consumption. This cooler can eliminate dew and mud occurrence and control the temperature through the frequency converting of the blower and it is easy and reliable to operate.