Detecting a cleaning process in a plant having filters arranged spatially offset from one another

Patent metadata

Field	Value
Publication number	US-2016151733-A1
Application number	US-201414905221-A
Country	US
Kind code	A1
Filing date	Jul 9, 2014
Priority date	Jul 17, 2013
Publication date	Jun 2, 2016
Grant date	—

Abstract

A method for detecting a cleaning process in a plant having filters ( 1, 31 ) arranged spatially offset from one another, wherein a first gas ( 21 ) having solid particles ( 20 ) is conducted in a first flow direction ( 10 ) filtered by a respective filter ( 1, 31 ). To clean the respective filter ( 1, 31 ), a second gas ( 22 ) is conducted through the filter ( 1, 31 ) opposite the first flow direction ( 10 ). Then listen to noise produced in the filtering or other physical phenomena to determine a condition of the filter including if it is being cleaned. To detect a cleaning process in a plant, a respective noise ( 12 ) is detected by acoustic sensors ( 2, 32, 2′, 32′, 42 ) arranged spatially offset from one another during the cleaning of the respective filter ( 1, 31 ). Further disclosed are a system for detecting a cleaning process in a plant having such filters, and such a plant.

First claim

1 . A method for detecting a cleaning process in a plant having filters wherein the filters are arranged spatially offset from one another, the method comprising:
feeding a first gas containing solid particles in a first flow direction through the filters for the first gas; for a purpose of cleaning the filters, feeding a second gas through the filters in a second direction of flow opposite to the first direction of flow, capturing a relevant noise which arises during the cleaning of the filters by means of respective acoustic sensors for picking up air sounds for each of the filters, arranging respective sensors for each filter with a spatial offset from one another, wherein the cleaning of the filters is detected by the capture of the noise by means of at least two of the acoustic sensors, by comparing, for at least two of the acoustic sensors for each of the filters, relevant time points for the arrival of the noise, and determining at least one difference interval, wherein the difference interval which is determined is compared with a relevant stored difference interval for the detecting of the cleaning process.

2 . The method as claimed in claim 1 , wherein the cleaning of each filter is detected by comparing the time points at which the relevant noise arrives at each of at least two acoustic sensors.

3 . (canceled)

4 . The method as claimed in claim 1 , wherein, for determining the relevant time point for the arrival of the noise at the relevant acoustic sensor, determining a point in time of a maximum noise amplitude.

5 . The method as claimed in claim 1 , further comprising analyzing relevant noise which has been captured by means of a Fourier transformation.

6 . The method as claimed in claim 5 , further comprising:
creating a first message if, within a prescribable frequency range, the energy of the noise which has been captured exceeds or falls below a prescribable first value.

7 . The method as claimed in claim 5 , further comprising:
creating a second message if a ratio of the energy of the noise, captured within a prescribable second frequency range, to the energy of the noise captured outside the prescribable second frequency range, exceeds or falls below a prescribable second value, as applicable.

8 . The method as claimed in claim 1 , further comprising capturing the relevant noise and filtering the relevant noise by a high-pass filter.

9 . The method as claimed in claim 1 , further comprising providing a sound enclosure for at least two of the sensors for a filter, arranging the at least two acoustic sensors for the filter in the sound enclosure; and
providing a valve in the sound enclosure, arranging the valve, for feeding the second gas through the filter in a second direction of flow to the filter opposite to the first flow direction.

10 . The method as claimed in claim 1 , wherein the at least two acoustic sensors are configured to create a sensor signal,
communicating the sensor signal to a computing unit, and determining by the computing unit, by comparing the sensor signal with a reference sensor signal, for determining a status for the at least one filter and/or for the valve for the at least one filter.

11 . A system for the detection of a cleaning process in a plant having filters wherein the filters are arranged spatially offset from one another, the system comprising:
a first filter through which a first gas containing solid particles is fed in a first flow direction through the first filter to be filtered by the first filter, and a first device for feeding the first gas in the first flow direction; a second device for feeding a second gas through the first filter in a direction of flow opposite to the first direction of flow for cleaning the first filter, acoustic sensors configured for picking up air sounds, the acoustic sensors are arranged with a spatial offset from one another, the acoustic sensors are located and configured to capture a relevant noise which arises during the cleaning of the first filter; and a computing unit configured to detect the cleaning of the filter by the capture of the noise by the at least two of the acoustic sensors; and for the first filter, the computing unit being configured for comparing the at least two of the acoustic sensors for the first filter for relevant time points for the arrival of the noise, such that at least one difference interval is determined, wherein the difference interval which is determined is compared with a relevant stored difference interval.

12 . The system as claimed in claim 11 , further comprising:
a sound enclosure, in which the acoustic sensors for the first filter are arranged; and the second device comprises a valve, configured and operable to feed the second gas through the first filter in a direction of flow opposite to the first flow direction.

13 . A plant for filtering a first gas containing particles of solid matter, the plant comprising:
filters arranged spatially offset from one another, through which the first gas is fed and by which the first gas is filtered, the second device for feeding a second gas in a direction of flow through the filters for cleaning the filters, and a system as claimed in claim 11 .

14 . The plant as claimed in claim 13 comprising:
the system further comprising a sound enclosure, in which the acoustic sensors for the filters are arranged; and
the second device comprises a valves arranged in the sound enclosure, configured and operable for feeding the second gas through the filters in a direction of flow opposite to the first flow direction of the first gas.

15 . A system for the detection of a cleaning process in a plant having filters, wherein the filters are arranged spatially offset from one another, the system comprising:
a first filter through which a first gas containing solid particles is fed in a first flow direction through the first filter to be filtered by the first filter, and a first device for feeding the first gas in the first flow direction; a second filter through which a second gas containing solid particles is fed in a second flow direction through the second filter to be filtered by the second filter, and a second device for feeding the second gas in the second flow direction; devices for feeding a second gas through the first and second filters in directions of flow opposite to the first and second directions of flow for cleaning the first filters, acoustic sensors configured for picking up air sounds, from the first and second filters, the acoustic sensors are arranged with a spatial offset from one another, first ones of the acoustic sensors are located and configured to capture a relevant noise which arises during the cleaning of the first filter, second ones of the acoustic sensors are located and configured to capture a relevant noise which arises during the cleaning of the second filter; a computing unit configured to detect the cleaning of the first and second filters by the capture of the noises by the at least two of the acoustic sensors for each of the filters; and for the first filter, the computing unit being configured for comparing the at least two of the acoustic sensors for the first filter for relevant time points for the arrival of the noise, such that at least one difference interval is determined, wherein the difference interval which is determined is compared with a relevant stored difference interval; and for the second filter, the computing unit being configured for comparing the at least two of the acoustic sensors for the second filter for relevant time points for the arrival of the noise, such that

Assignees

• Primetals Technologies Austria GmbH

Inventors

• Fischer Paul
• Hartl Franz
• Keusch Thomas
• Kuehas Thomas
• Lehofer Martin
• Riese Axel
• Rohrhofer Andreas
• Weinzinger Michael

Classifications

• B01D2273/24

  Making use of acoustic waves, e.g. for measurements · CPC title

• B01D46/0086 Primary

  Filter condition indicators · CPC title

• B01D46/0068

  Operations & Transport · mapped topic

• B01D46/00 Primary

  Filters or filtering processes specially modified for separating dispersed particles from gases or vapours (filtering elements B01D24/00-B01D35/00; filtering material B01D39/00; their regeneration outside the filters B01D41/00) · CPC title

• B01D46/71

  with pressurised gas, e.g. pulsed air · CPC title