GB2114019A - Indication of defective filter elements in filter plants - Google Patents

Indication of defective filter elements in filter plants Download PDF

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Publication number
GB2114019A
GB2114019A GB08200944A GB8200944A GB2114019A GB 2114019 A GB2114019 A GB 2114019A GB 08200944 A GB08200944 A GB 08200944A GB 8200944 A GB8200944 A GB 8200944A GB 2114019 A GB2114019 A GB 2114019A
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GB
United Kingdom
Prior art keywords
filter
elements
detector
filter elements
plant
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB08200944A
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GB2114019B (en
Inventor
Ronald George Godding
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
British Cast Iron Research Association
Bcira
Original Assignee
British Cast Iron Research Association
Bcira
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by British Cast Iron Research Association, Bcira filed Critical British Cast Iron Research Association
Priority to GB08200944A priority Critical patent/GB2114019B/en
Publication of GB2114019A publication Critical patent/GB2114019A/en
Application granted granted Critical
Publication of GB2114019B publication Critical patent/GB2114019B/en
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/0084—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours provided with safety means
    • B01D46/0086—Filter condition indicators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/56—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
    • G01M3/20—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material

Abstract

A dust-filter plant comprises a number of individual filter elements arranged in parallel. In order to see that the dust to be filtered is not passing unimpeded through any of the elements, each element is checked in sequence for the presence of dust on its clean air side. Apparatus for carrying out this checking includes a multi-port rotating switching valve (5) for sampling air from the clean air side of each filter element in turn, and arranged to stop when dust is detected by an associated detector (3), indicating means associated with the switching valve (5) thereby indicating which of the filter elements is defective. <IMAGE>

Description

SPECIFICATION Indication of defective filter elements in filter plants This invention relates to filter plants which comprise a plurality of filter elements arranged in parallel. Such filter plants will hereinafter be referred to as "of the kind described".
Filter plants of the kind described are commonly used for separating contaminants from both liquids and gases, but particularly for extracting dust from air by arrays of filter bags or pockets.
Such filter plants often incorporate a contaminant detector in their outlets to indicate when the contaminant is flowing unimpeded through a filter element or group of filter elements i.e., when an element or group of elements has failed, possibly due to breakdown of the filter fabric. In ferrous foundries, for instance, certain metallic contaminants would be detected by a magnetic dust detector.
Following an indication of failure of the filter, the faulty element has previously been identified by individually checking each element or group of elements, which is a time-consuming and sometimes unpleasant task. It is an aim of the invention to provide a filter plant of the kind described incorporating an indicator which informs the operator which filter element or elements are to be replaced if and when an element failure occurs.
One aspect of the invention consists in a method of identifying one or more defective filter elements or groups of filter elements in a filter plant of the kind described in which material from the individual outlets of the elements or groups of elements is sequentially sampled, the samples being passed to a contamination detector, each element or group of elements being checked in turn. In this way, the need for separate detectors for each element or group of elements is obviated.
A further aspect of the invention consists in apparatus for identifying one or more defective filter elements in a filter plant of the kind described comprising a contamination detector having an inlet in communication with sampling means arranged sequentially to derive its input from the outputs of each of the filter elements or group of filter elements in turn, and display means operating in connection with the detector and the sampling means adapted to indicate which, if any, of the elements or group of elements permit throughflow of contaminant to the detector. A pump is provided at an outlet of the detector to ensure flow through the apparatus. Such apparatus is particularly suitable for use with filter plants comprising arrays of bag or pocket filters for the separation of dust from air, and in particular dust containing magnetic particles such as is found in a ferrous foundry.In such an application, the detector is preferably a magnetic dust detector of a known type.
The invention will now be further described, by way of example only, with reference to the accompanying drawing, which is a schematic diagram of apparatus according to the invention adapted for installation in the dust filtering plant of a ferrous foundry.
As shown in the drawing, an indicating apparatus shown generally at 1 is connected to the clean air side of individual filter elements (not shown) of a filter plant of the kind shown generally at 2. The clean air side of the filter plant is at slightly negative pressure because of the fan used to maintain flow through the system which includes the filter elements (not shown).
The indicating apparatus comprises a magnetic dust detector 3 fed through a tube 4 by a sampling device in the form of a multi-port motorised switching valve 5. Only nine operative ports are shown, but in practice the number corresponds to the number of filter elements of the plant.
The parts of the switching valve 5 are fed by thin sampling tubes 6 installed in the outlet mouths of each of the filter elements. It is necessary that the suction pressure in the sampling tubes 6 be sufficiently low to overcome the slight negative pressure of the clean air side of the filter plant, and a pump 7 is provided for this purpose.
The air from the filter element under check is drawn by means of the pump 7 through the detector 3 for a fixed period, during which the detector will operate if more than a pre-set amount of magnetic dust is present. The output of the detector 3 is used to stop the rotation of the valve 5 which causes a rotary indicator (not shown) to stop against a mark denoting the identity of the filter element in question.
Those tubes 6 from the filter plant not currently in communication with the detector 3 are left open in an enclosure 8 surrounding the valve 5 which is open to atmosphere through a filter 9.
Because the filter elements are under negative pressure, clean air will be drawn back towards the elements, ensuring that the tubes 6 are kept clean.
The switching valve 5 may be set to any switching speed, but a typical period for complete rotation of a 24-port valve is 26 minutes.
1. A method of identifying one or more defective filter elements or group of filter elements in a filter plant of the kind described in which material from the individual outlets of the elements or group of elements is sequentially sampled, the samples being passed to a contamination detector, each element or group of elements thereby being checked in turn.
2. Apparatus for identifying one or more defective filter elements in a filter plant of the kind described comprising a contamination detector having an inlet in communication with sampling means arranged sequentially to derive its input from the outlets of each of the filter elements or groups of filter elements in turn, and display means operating in conjunction with the detector and the sampling means adapted to indicate which, if any, of the elements or groups of
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (7)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Indication of defective filter elements in filter plants This invention relates to filter plants which comprise a plurality of filter elements arranged in parallel. Such filter plants will hereinafter be referred to as "of the kind described". Filter plants of the kind described are commonly used for separating contaminants from both liquids and gases, but particularly for extracting dust from air by arrays of filter bags or pockets. Such filter plants often incorporate a contaminant detector in their outlets to indicate when the contaminant is flowing unimpeded through a filter element or group of filter elements i.e., when an element or group of elements has failed, possibly due to breakdown of the filter fabric. In ferrous foundries, for instance, certain metallic contaminants would be detected by a magnetic dust detector. Following an indication of failure of the filter, the faulty element has previously been identified by individually checking each element or group of elements, which is a time-consuming and sometimes unpleasant task. It is an aim of the invention to provide a filter plant of the kind described incorporating an indicator which informs the operator which filter element or elements are to be replaced if and when an element failure occurs. One aspect of the invention consists in a method of identifying one or more defective filter elements or groups of filter elements in a filter plant of the kind described in which material from the individual outlets of the elements or groups of elements is sequentially sampled, the samples being passed to a contamination detector, each element or group of elements being checked in turn. In this way, the need for separate detectors for each element or group of elements is obviated. A further aspect of the invention consists in apparatus for identifying one or more defective filter elements in a filter plant of the kind described comprising a contamination detector having an inlet in communication with sampling means arranged sequentially to derive its input from the outputs of each of the filter elements or group of filter elements in turn, and display means operating in connection with the detector and the sampling means adapted to indicate which, if any, of the elements or group of elements permit throughflow of contaminant to the detector. A pump is provided at an outlet of the detector to ensure flow through the apparatus. Such apparatus is particularly suitable for use with filter plants comprising arrays of bag or pocket filters for the separation of dust from air, and in particular dust containing magnetic particles such as is found in a ferrous foundry.In such an application, the detector is preferably a magnetic dust detector of a known type. The invention will now be further described, by way of example only, with reference to the accompanying drawing, which is a schematic diagram of apparatus according to the invention adapted for installation in the dust filtering plant of a ferrous foundry. As shown in the drawing, an indicating apparatus shown generally at 1 is connected to the clean air side of individual filter elements (not shown) of a filter plant of the kind shown generally at 2. The clean air side of the filter plant is at slightly negative pressure because of the fan used to maintain flow through the system which includes the filter elements (not shown). The indicating apparatus comprises a magnetic dust detector 3 fed through a tube 4 by a sampling device in the form of a multi-port motorised switching valve 5. Only nine operative ports are shown, but in practice the number corresponds to the number of filter elements of the plant. The parts of the switching valve 5 are fed by thin sampling tubes 6 installed in the outlet mouths of each of the filter elements. It is necessary that the suction pressure in the sampling tubes 6 be sufficiently low to overcome the slight negative pressure of the clean air side of the filter plant, and a pump 7 is provided for this purpose. The air from the filter element under check is drawn by means of the pump 7 through the detector 3 for a fixed period, during which the detector will operate if more than a pre-set amount of magnetic dust is present. The output of the detector 3 is used to stop the rotation of the valve 5 which causes a rotary indicator (not shown) to stop against a mark denoting the identity of the filter element in question. Those tubes 6 from the filter plant not currently in communication with the detector 3 are left open in an enclosure 8 surrounding the valve 5 which is open to atmosphere through a filter 9. Because the filter elements are under negative pressure, clean air will be drawn back towards the elements, ensuring that the tubes 6 are kept clean. The switching valve 5 may be set to any switching speed, but a typical period for complete rotation of a 24-port valve is 26 minutes. CLAIMS
1. A method of identifying one or more defective filter elements or group of filter elements in a filter plant of the kind described in which material from the individual outlets of the elements or group of elements is sequentially sampled, the samples being passed to a contamination detector, each element or group of elements thereby being checked in turn.
2. Apparatus for identifying one or more defective filter elements in a filter plant of the kind described comprising a contamination detector having an inlet in communication with sampling means arranged sequentially to derive its input from the outlets of each of the filter elements or groups of filter elements in turn, and display means operating in conjunction with the detector and the sampling means adapted to indicate which, if any, of the elements or groups of elements permit throughflow of contaminant to the detector.
3. Apparatus according to Claim 2 in which a pump is provided at an outlet of the detector.
4. Apparatus according to Claim 2 or Claim 3 in conjunction with filter elements of the bag or pocket types, adapted to separate dust from air.
5. Apparatus according to Claim 4 in which the detector is a magnetic dust detector.
6. A method for identifying one or more defective filter elements in a filter plant of the kind described, substantially as described herein with reference to and as illustrated in the accompanying drawings.
7. Apparatus for identifying one or more defective filter elements in a filter plant of the kind described, substantially as described herein with reference to and as illustrated by the accompanying drawings.
GB08200944A 1982-01-13 1982-01-13 Indication of defective filter elements in filter plants Expired GB2114019B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08200944A GB2114019B (en) 1982-01-13 1982-01-13 Indication of defective filter elements in filter plants

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08200944A GB2114019B (en) 1982-01-13 1982-01-13 Indication of defective filter elements in filter plants

Publications (2)

Publication Number Publication Date
GB2114019A true GB2114019A (en) 1983-08-17
GB2114019B GB2114019B (en) 1985-06-05

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Family Applications (1)

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GB08200944A Expired GB2114019B (en) 1982-01-13 1982-01-13 Indication of defective filter elements in filter plants

Country Status (1)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996025997A1 (en) * 1995-02-21 1996-08-29 Abbott Laboratories On-line air filter integrity testing apparatus
GB2342431A (en) * 1998-08-19 2000-04-12 Mcintyre J Fume purification system for a furnace
RU2458730C2 (en) * 2009-11-13 2012-08-20 Украинский Государственный Научно-Технический Центр По Технологии И Оборудованию, Обработке Металлов, Защите Окружающей Среды И Использованию Вторичных Ресурсов Для Металлургии И Машиностроения "Энергосталь" Bag filter for gas cleaning
CN114001883A (en) * 2021-12-30 2022-02-01 山东海林环保设备工程有限公司 Sealing performance detection device of environmental protection equipment

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996025997A1 (en) * 1995-02-21 1996-08-29 Abbott Laboratories On-line air filter integrity testing apparatus
GB2342431A (en) * 1998-08-19 2000-04-12 Mcintyre J Fume purification system for a furnace
RU2458730C2 (en) * 2009-11-13 2012-08-20 Украинский Государственный Научно-Технический Центр По Технологии И Оборудованию, Обработке Металлов, Защите Окружающей Среды И Использованию Вторичных Ресурсов Для Металлургии И Машиностроения "Энергосталь" Bag filter for gas cleaning
CN114001883A (en) * 2021-12-30 2022-02-01 山东海林环保设备工程有限公司 Sealing performance detection device of environmental protection equipment
CN114001883B (en) * 2021-12-30 2022-03-25 山东海林环保设备工程有限公司 Sealing performance detection device of environmental protection equipment

Also Published As

Publication number Publication date
GB2114019B (en) 1985-06-05

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Legal Events

Date Code Title Description
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
746 Register noted 'licences of right' (sect. 46/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19930113