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Abstract

A system (10) and method (100) for detecting and suppressing a dust explosion occurring in a process enclosure (12). A sensor (14) generates a pressure signal indicative of a pressure within the enclosure (12). A processing element (16) analyzes the signal to determine whether the dust explosion is occurring. The signal is sampled at a higher frequency, and then converted to a lower frequency by averaging, then filtered with first and intermediate filters to remove portions of the signal having rates of increase that exceed pre-established maximum magnitudes, and then filtered with a second filter having an appropriate cut-off frequency, stop band attenuation factor, and end of passband frequency. An alarm and a suppression system (18) are activated if a static pressure exceeds a limit, a rate of pressure increase exceeds a limit, or a total suppressed pressure exceeds a limit, each of which indicates occurrence of the dust explosion.

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First Claim