29-09-2022 дата публикации
Номер: US20220305316A1
Принадлежит:
A system () and method () for detecting and suppressing a dust explosion occurring in a process enclosure (). A sensor () generates a pressure signal indicative of a pressure within the enclosure (). A processing element () 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 () 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. 1. A method for detecting and suppressing a dust explosion occurring in a process enclosure , the method comprising the steps of:generating with a pressure sensor a pressure signal indicative of a pressure within the process enclosure; and sampling the received pressure signal at a higher frequency,', 'converting the sampled pressure signal from the higher frequency to a lower frequency,', 'filtering the converted pressure signal with a first filter to remove a first portion of the pressure signal having a rate of increase that grows over one millisecond with more than a first pre-established maximum magnitude,', 'filtering the first filtered pressure signal with an intermediate filter to remove a second portion of the pressure signal having a rate of increase exceeding a second pre-established maximum magnitude,', 'filtering the intermediate filtered pressure signal with a second filter having a cut-off frequency, a stop band attenuation factor, and an end of passband frequency, and', 'activating a suppression system if the first filtered pressure ...
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