The key to collecting VOCs waste gas is to determine control points and control wind speed, and several basic concepts are as follows:
① Control point: refers to the position where harmful substances are released until the initial energy is exhausted, and the release rate is reduced to the level of irregular airflow in the environment.
② Control wind speed: The minimum wind speed required to inhale harmful VOCs substances into the hood at the control point.
③ Hood mouth wind speed: The average wind speed on the effective cross-section at the hood mouth.
④ Section wind speed: The average wind speed on an open section.
The key assessment points for controlling wind speed requirements through various forms of exhaust collection are shown in the table below:
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