In the air stream drier, due to material in the dryer to drying of short residence time, the quality of the finished product to get the best control.

Due to extremely short residence time of supersonic airflow, it is difficult to effectively mix and combust for the fuel and air in scramjet combustor.

Owing to the short residence time, more uniform gas-solid flow and reduced backmixing of downer reactor, it can obtain more object products and the dry gas yield can be inhibited.