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Sampling of tangential flow streams

D A Lundgren, M D Durham, K W Mason

    American Industrial Hygiene Association Journal
    |August 1, 1978
    PubMed
    Summary
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    Tangential flow in industrial stacks causes errors in measuring flow rate and particulate concentration. Installing straightening vanes can significantly reduce these measurement errors.

    Area of Science:

    • Environmental Engineering
    • Industrial Emissions Monitoring

    Background:

    • Industrial stacks often exhibit tangential flow, a swirling gas motion that can impact measurement accuracy.
    • Accurate determination of volumetric flow rate and particulate concentration is crucial for regulatory compliance and process control.

    Purpose of the Study:

    • To describe the causes and characteristics of tangential flow in industrial stacks.
    • To analyze the errors introduced by tangential flow in volumetric flow rate and particulate concentration measurements.
    • To investigate the impact of tangential flow on emission rate determination at a cyclone collector outlet.

    Main Methods:

    • Experimental investigation at the outlet of a cyclone collector.
    • Analysis of errors induced by tangential flow on key emission parameters.

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    Main Results:

    • Tangential flow was observed to introduce significant errors in flow rate and particulate concentration measurements.
    • Straightening vanes were experimentally found to be effective in mitigating these errors.

    Conclusions:

    • Tangential flow is a critical factor affecting the accuracy of industrial stack emission monitoring.
    • The implementation of flow straightening devices, such as vanes, is recommended to improve the reliability of emission rate measurements.