US5346533A
Expired / Lapsed
US
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Method of monitoring filter components
Assignee: DEUTSCHE BABCOCK ENERGIE- und UMWELTTECHNIK
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Filing: 1993-07-28
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Granted: 1994-09-13
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Expires: 2013-07-28
Abstract
Abstract A method of monitoring filter components. The components are hollow and employed for filtering hot and dusty gases. They are accommodated in groups in a housing. Each group communicates through a single supply line with a filtered-gas line. The filtered-gas line conveys the filtered gas away. A sweeper is injected in the form of a gas into each supply line in cycles at higher pressure. The sweeping cycle is recorded. Measurement is carried out in the flow of sweeper and/or of filtered gas. The result of the measurement is compared with the record and an alarm released in the event of a discrepancy.
Inventors
- 👤 Werner Jelich
- 👤 Heiko Rehwinkel
- 👤 Friedrich Klauke
- 👤 Dieter Konig
- 👤 Udo Kalthoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:16
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/24; B01D46/2403; B01D46/2407; B01D46/0084; B01D46/0086; B01D46/42; B01D46/44; B01D46/446; B01D46/66; B01D46/70; B01D46/71; B01D2273/00; B01D2273/20
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
172 words
A method for monitoring hollow filter elements used for filtering hot and dusty gases, comprising the steps of: arranging said filter elements in groups in a filter housing; connecting each group through a single supply line with a filtered-gas line; conveying filtered gas away through said filtered gas line; injecting a filtering sweeping medium with flow in form of a gas into each supply line in cycles at higher pressure; registering a filtering cycle; recording and measuring at least one of sweeper flow and filtered gas flow; comparing a result of said measuring step with a registration of a sweeping cycle; and releasing an alarm when a difference results from said comparing step, whereby a defective filter element can be isolated and penetration of unfiltered gas into the filtered gas is prevented, each sweeping cycle being related to a change at a filtered gas side, a group having a defective filter element being excluded from sweeping and a fracture in the defective filter element becoming sealed with dust and decontamination being initiated.
Claim 2
Independent Claim
172 words
A method for monitoring hollow filter elements used for filtering hot and dusty gases, comprising the steps of: arranging said filter elements in groups in a filter housing; connecting each group through a single supply line with a filtered-gas line; conveying filtered gas away through said filtered gas line; injecting a filtering sweeping medium with flow in form of a gas into each supply line in cycles at higher pressure; registering a filtering cycle; recording and measuring at least one of sweeper flow and filtered gas flow; comparing a result of said measuring step with a registration of a sweeping cycle; and releasing an alarm when a difference results from said comparing step, whereby a defective filter element can be isolated and penetration of unfiltered gas into the filtered gas is prevented, each sweeping cycle being related to a change at a filtered gas side, a group having a defective filter element being excluded from sweeping and a fracture in the defective filter element becoming sealed with dust and decontamination being initiated.
Claim 3
Dependent Claim
58 words
A method as defined in claim 1, including the steps of generating individual sweeping pulses in each sweeping lance during a sweeping cycle; recording a maximum value of said individual sweeping pulses; comparing said maximum value with a standard; and releasing said alarm for a respective group of filter elements when a difference results from said comparing step.
Claim 4
Dependent Claim
60 words
A method as defined in claim 1, including the steps of measuring dust density and a pressure pulse of the filtered gas in relation to the sweeping cycle; designating said measuring step to a group of filter elements that was swept; and releasing said alarm for a related group of filter elements when a difference results from said comparing step.
Claim 5
Dependent Claim
56 words
A method as defined in claim 1, including the steps of measuring dust density of the filtered gas in relation to the sweeping cycle; designating said measuring step to a group of filter elements that was swept; and releasing said alarm for a related group of filter elements when a difference results from said comparing step.
Claim 6
Dependent Claim
57 words
A method as defined in claim 1, including the steps of measuring a pressure pulse of the filtered gas in relation to the sweeping cycle; designating said measuring step to a group of filter elements that was swept; and releasing said alarm for a related group of filter elements when a difference results from said comparing step.
Claim 7
Dependent Claim
28 words
A method as defined in claim 1, including the step of withdrawing a particular group of filter elements from sweeping when a difference results from said comparing step.
Claim 8
Dependent Claim
32 words
A method as defined in claim 1, including the steps of recording and comparing sweeping pulses, dust density, and a pressure pulse, through switching means, with a recording of a sweeping cycle.
Claim 9
Independent Claim
279 words
A method for monitoring hollow filter elements used for filtering hot and dusty gases, comprising the steps of: arranging said filter elements in groups in a filter housing; connecting each group through a single supply line with a filtered-gas line; conveying filtered gas away through said filtered gas line; injecting a filtering sweeping medium with flow in form of a gas into each supply line in cycles at higher pressure; registering a filtering cycle; recording and measuring at least one of sweeper flow and filtered gas flow; comparing a result of said measuring step with a registration of a sweeping cycle; and releasing an alarm when a difference results from said comparing step, whereby a defective filter element can be isolated and penetration of unfiltered gas into the filtered gas is prevented, each sweeping cycle being related to a change at a filtered gas side, a group having a defective filter element being excluded from sweeping and a fracture in the defective filter element becoming sealed with dust and decontamination being initiated; generating individual sweeping pulses in each sweeping lance during a sweeping cycle; recording a maximum value of said individual sweeping pulses; comparing said maximum value with a standard; releasing said alarm for a respective group of filter elements when a difference results form said comparing step; measuring dust density and a pressure pulse of the filtered gas in relation to the sweeping cycle; designating said measuring step to a group of filter elements that was swept; withdrawing a particular group of filter elements from sweeping; and recording and comparing sweeping pulses, dust density, and a pressure pulse, through switching means, with a recording of a sweeping cycle.
Claim 10
Independent Claim
279 words
A method for monitoring hollow filter elements used for filtering hot and dusty gases, comprising the steps of: arranging said filter elements in groups in a filter housing; connecting each group through a single supply line with a filtered-gas line; conveying filtered gas away through said filtered gas line; injecting a filtering sweeping medium with flow in form of a gas into each supply line in cycles at higher pressure; registering a filtering cycle; recording and measuring at least one of sweeper flow and filtered gas flow; comparing a result of said measuring step with a registration of a sweeping cycle; and releasing an alarm when a difference results from said comparing step, whereby a defective filter element can be isolated and penetration of unfiltered gas into the filtered gas is prevented, each sweeping cycle being related to a change at a filtered gas side, a group having a defective filter element being excluded from sweeping and a fracture in the defective filter element becoming sealed with dust and decontamination being initiated; generating individual sweeping pulses in each sweeping lance during a sweeping cycle; recording a maximum value of said individual sweeping pulses; comparing said maximum value with a standard; releasing said alarm for a respective group of filter elements when a difference results form said comparing step; measuring dust density and a pressure pulse of the filtered gas in relation to the sweeping cycle; designating said measuring step to a group of filter elements that was swept; withdrawing a particular group of filter elements from sweeping; and recording and comparing sweeping pulses, dust density, and a pressure pulse, through switching means, with a recording of a sweeping cycle.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-09-12 | 1998-03-14 | 1998-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-09-12 | 2002-03-14 | 2002-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-09-12 | 2006-03-14 | 2006-09-13 | $7700.00 | Window Closed / Lapsed |