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WO2017089439A1 - Appareil pour détecter et localiser des sacs filtrants défectueux dans un dépoussiéreur à manches à l'aide de capacitance - Google Patents

Appareil pour détecter et localiser des sacs filtrants défectueux dans un dépoussiéreur à manches à l'aide de capacitance Download PDF

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Publication number
WO2017089439A1
WO2017089439A1 PCT/EP2016/078628 EP2016078628W WO2017089439A1 WO 2017089439 A1 WO2017089439 A1 WO 2017089439A1 EP 2016078628 W EP2016078628 W EP 2016078628W WO 2017089439 A1 WO2017089439 A1 WO 2017089439A1
Authority
WO
WIPO (PCT)
Prior art keywords
filter
grid
conductive component
conductive material
capacitance
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.)
Ceased
Application number
PCT/EP2016/078628
Other languages
English (en)
Inventor
Sunil RAJARAM
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.)
FLSmidth AS
Original Assignee
FLSmidth AS
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 FLSmidth AS filed Critical FLSmidth AS
Publication of WO2017089439A1 publication Critical patent/WO2017089439A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • B01D46/02—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
    • B01D46/0084—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours provided with safety means
    • B01D46/0086—Filter condition indicators

Definitions

  • the present invention relates to industrial baghouses and more particularly to an apparatus for detecting and locating leaks in the individual filter bags within the baghouse.
  • Baghouses typically include a housing (e.g. made of sheet metal) divided into two or more chambers, referred to as plenums, by one or more sheets. Disposed within openings communicating with the plenums are filters in the form of filter bags constructed of a suitable fabric. For structural rigidity filter bags are typically disposed around filter cages. A particle laden gas stream, induced by the action of a fan (from e.g. a manifold air tank), flows into one chamber (dirty air plenum) where dust accumulates on the filter bags as the gas passes through the fabric into the other chamber (clean air plenum) and out the exhaust.
  • a fan from e.g. a manifold air tank
  • More advanced techniques include using optical fibers disposed on each of the filter bags in order to identify which filter bags are defective.
  • this process is inefficient, impractical and problematic. For example, constant cleaning of the optical sensors is needed during operation to keep the optical sensors free of dust and prevent them from malfunctioning.
  • the apparatus may comprise: a grid of conductive material for sensing a change in capacitance, the grid of conductive material disposed above a filter cage assembly; and a processing device for determining the location of the change in capacitance, the processing device coupled to the grid of conductive material.
  • the grid of conductive material may be comprised of a first conductive component disposed in a lateral x-direction and a second conductive component disposed in a longitudinal y-direction.
  • the filter cage assembly may be comprised of a filter cage and a corresponding filter bag arranged around the periphery of the filter cage.
  • the filter cage assembly may comprise a venturi disposed within the filter cage.
  • the first conductive component may be comprised of bars or strips.
  • the bars or the strips may be comprised of copper.
  • the bar or the strips may be attached to the filter cage assembly.
  • the second conductive component may be a purge tube. In an exemplary embodiment, the second conductive component may be located on the purge tube. In an exemplary embodiment, the second conductive component may be located above the first conductive component. In an exemplary embodiment, there may be a gap between the first conductive component and the second conductive component. In an exemplary embodiment, the gap may be approximately 150 mm.
  • the processing device may be comprised of a sensor board and a microcontroller.
  • the first conductive component and the second conductive component may form grid points above the filter cage assembly wherein each of the grid points correspond to a single filter cage or filter bag.
  • the sensor board may be coupled to the grid of conductive material via channels, wherein the channels may correspond to rows and columns of filter bags.
  • a first set of channels may correspond to columns of filter bags and a second set of channels may correspond to rows of filter bags.
  • Figure 1 shows an overview of an exemplary embodiment of the apparatus according to the invention.
  • FIG. 2 shows an overview of an exemplary embodiment of the filter cage according to the invention.
  • FIG 1 depicts an exemplary embodiment of an apparatus 1 for detecting and locating failed filter bags in a baghouse.
  • the apparatus may contain a filter cage assembly 3.
  • the filter cage assembly 3 contains filter bags 7.
  • the filter cage assembly 3 may also contain a filter cage 6 (as shown in Figure 2).
  • the filter cage 6 can be a ground insulated wire welded structure and the filter bag 7 can be arranged around the periphery of the filter cage 6.
  • a venturi 8 may be disposed within the filter cage 6 (e.g.
  • a tube sheet 10 may be vertically disposed in a horizontal plane above the filter cages 6 and filter bags 7 in order to mechanically support, arrange or connect the filter cages 6 and filter bags 7.
  • the filter cages 6 with corresponding filter bags 7 (and the first/second conductive components 4, 5) may be electrically insulated from the tube sheet 10. Such electrical insulation is advantageous when neither the first/second conductive components 4, 5 nor the filter cage assembly 3 are grounded. In an exemplary embodiment, in order to accurately sense a change in capacitance, neither the first/second conductive components 4, 5 nor the filter cage assembly 3 are grounded.
  • the filter cages 6 with corresponding filter bags 7 may be arranged in a 4 (row) x 3 (column) grid. It may be appreciated that in operation there will be significantly more columns and/or rows. Rows of the filter cages 6 with corresponding filter bags 7 may be connected using a first conductive component 4.
  • the first conductive component 4 can be in the form of bars or strips.
  • the first conductive component 4 may be disposed over the tube sheet 10 and attach e.g. onto the side(s) of the filter cages 6 / filter bags 7. In some embodiments the bars or the strips are comprised of copper.
  • the first conductive component 4 may be arranged so that it is substantially perpendicular to the second conductive component 5.
  • the second conductive component 5 can be placed on e.g. purge tubes 9.
  • the second conductive components are the purge tubes 9.
  • each of the purge tubes 9 are arranged over a column of filter cages 6 / filter bags 7.
  • the purge tubes 9 are comprised of steel.
  • the purge tubes 9 may be mild steel tubes with air holes along their length, the holes being aligned to the center of the respective filter cages 6.
  • the vertical gap there is a vertical gap between the first conductive component 4 and the second conductive component 5. In some embodiments, the vertical gap is approximately 150 mm. Such a vertical gap assists in e.g. the expansion of compressed air inside the filter cages 6/ venturi 8.
  • dust can be passed through the filter bag 6 whereby the dust gets deposited on the surface of the filter bag 6 and clean air comes out the other side of the filter bag 6.
  • the deposited dust on the outer surface of the filter bag may be cleaned by introducing compressed air into the filter bag 6 via e.g. a manifold air tank 1 1 .
  • the compressed air from the manifold air tank 1 1 may be given a short pulse using e.g. solenoid purge valves 12.
  • the air from the purge valves 12 passes through purge tubes 9 (or other second conductive components 5) which may be connected to the manifold air tank 1 1 .
  • the purge tubes 9 may have small air holes along the length of the purge tubes 9 for air to release. The holes are in line with the holes in the top of the filter bags 6.
  • the grid of conductive material 2 is capable of sensing a change in capacitance due to failed filter bags 7.
  • the first conductive component 4 and the second conductive component 5 form grid points (p) above the filter cage assembly 3.
  • Each of the grid points (p) correspond to a single filter cage 6 / filter bag 7.
  • grid point p1 corresponds to the filter bag 7 in row 1 , column 1
  • grid point p2 corresponds to the filter bag 7 in row 1 column 2
  • grid point p3 corresponds to the filter bag 7 in row 1 , column 3
  • grid point p4 corresponds to the filter bag in row 2 column 1
  • grid point p5 corresponds to the filter bag 7 in row 2
  • grid point p6 corresponds to the filter bag in row 2 column 3
  • grid point p7 corresponds to the filter bag 7 in row 3, column 1
  • grid point p8 corresponds to the filter bag in row 3 column 2
  • grid point p9 corresponds to the filter bag 7 in row 3, column 3
  • grid point p10 corresponds to the filter bag in row 4 column 1
  • grid point p1 1 corresponds to the filter bag 7 in row 4, column 2
  • grid point p12 corresponds to the filter bag in row 4, column 3
  • Figure 1 also depicts a processing device 20.
  • the processing device 20 may be coupled to the grid of conductive material 2.
  • the processing device 20 can determine the location of the change in capacitance which was sensed by the grid of conductive material 2.
  • the processing device 20 is comprised of a sensor board 21 and a microcontroller 22.
  • the processing device 20 may be connected to the grid of conductive material 2 by lead channels 30.
  • the lead channels 30 may be connected directly from the grid of conductive material 2 to the sensor board 21 .
  • the first conductive component 4 may be connected to the sensor board 21 via channels (30d-30h) and the second conductive component 5 is connected to the sensor board via other channels (30a-30c).
  • the microcontroller 22 can be connected to the sensor board 21 via an interface card 23.
  • the interface card 23 can be an RS232 interface card.
  • a power supply 24 supplies power to the microcontroller 22 and the sensor board 21 .
  • the microcontroller 22 is able to calculate the capacitance measured from the sensor board 21 .
  • the gap between the first conductive component 4 and the second conductive component 5 has only clean air and therefore a certain constant capacitance value which is sensed by the grid of conductive material 2 and measured by the processing device 20.
  • the dust from the corresponding failed filter bag 7 comes out into the clean air side and passes through the gap between the first conductive component 4 and the second conductive component 5 which results in a capacitive value change sensed by the grid of conductive material 2.
  • the processing device 20 is then able to measure and determine the precise location of the failed filter bag 7.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)

Abstract

L'invention concerne un appareil (1) pour détecter et localiser des sacs filtrants défectueux dans un dépoussiéreur à manches, comprenant : une grille de matériau conducteur (2) pour détecter un changement de capacitance, la grille de matériau conducteur étant disposée au-dessus d'un ensemble cage de filtre (3) ; et un dispositif de traitement (20) pour déterminer l'emplacement du changement de capacitance, le dispositif de traitement (20) étant accouplé à la grille de matériau conducteur (2) ; la grille de matériau conducteur (2) comprenant un premier élément conducteur (4) disposé dans une direction x latérale et un second élément conducteur (5) disposé dans une direction y longitudinale.
PCT/EP2016/078628 2015-11-25 2016-11-24 Appareil pour détecter et localiser des sacs filtrants défectueux dans un dépoussiéreur à manches à l'aide de capacitance Ceased WO2017089439A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DKPA201570759 2015-11-25
DKPA201570759 2015-11-25

Publications (1)

Publication Number Publication Date
WO2017089439A1 true WO2017089439A1 (fr) 2017-06-01

Family

ID=58762995

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2016/078628 Ceased WO2017089439A1 (fr) 2015-11-25 2016-11-24 Appareil pour détecter et localiser des sacs filtrants défectueux dans un dépoussiéreur à manches à l'aide de capacitance

Country Status (1)

Country Link
WO (1) WO2017089439A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2025097133A1 (fr) * 2023-11-02 2025-05-08 Nitto Bend Technologies, Inc. Capteur extensible pour sacs filtrants

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4400971A (en) * 1981-05-29 1983-08-30 Electric Power Research Institute, Inc. Method and means for measuring particulate matter on a filter
US20070084339A1 (en) * 2005-10-05 2007-04-19 General Electric Company Methods and Systems for Detecting Baghouse Filter Leaks
CN202460360U (zh) * 2012-03-05 2012-10-03 沃晓枫 带物位计的长袋脉冲除尘器储灰仓
WO2015042960A1 (fr) * 2013-09-30 2015-04-02 Schneider Electric It Corporation Procédé et système de détection d'accumulation de poussière dans un système de filtration de chauffage, de ventilation et de climatisation

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4400971A (en) * 1981-05-29 1983-08-30 Electric Power Research Institute, Inc. Method and means for measuring particulate matter on a filter
US20070084339A1 (en) * 2005-10-05 2007-04-19 General Electric Company Methods and Systems for Detecting Baghouse Filter Leaks
CN202460360U (zh) * 2012-03-05 2012-10-03 沃晓枫 带物位计的长袋脉冲除尘器储灰仓
WO2015042960A1 (fr) * 2013-09-30 2015-04-02 Schneider Electric It Corporation Procédé et système de détection d'accumulation de poussière dans un système de filtration de chauffage, de ventilation et de climatisation

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2025097133A1 (fr) * 2023-11-02 2025-05-08 Nitto Bend Technologies, Inc. Capteur extensible pour sacs filtrants

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