EP0267898A1 - Procede et dispositif de surveillance de l'ecoulement d'un courant de gaz sortant d'un filtre - Google Patents

Procede et dispositif de surveillance de l'ecoulement d'un courant de gaz sortant d'un filtre

Info

Publication number
EP0267898A1
EP0267898A1 EP86903229A EP86903229A EP0267898A1 EP 0267898 A1 EP0267898 A1 EP 0267898A1 EP 86903229 A EP86903229 A EP 86903229A EP 86903229 A EP86903229 A EP 86903229A EP 0267898 A1 EP0267898 A1 EP 0267898A1
Authority
EP
European Patent Office
Prior art keywords
filter
dynamic pressure
gas
measuring device
tube
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.)
Withdrawn
Application number
EP86903229A
Other languages
German (de)
English (en)
Inventor
Alexander Maria Reinhardt
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.)
Schumachersche Fabrik GmbH and Co KG
Original Assignee
Schumachersche Fabrik GmbH and Co KG
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 Schumachersche Fabrik GmbH and Co KG filed Critical Schumachersche Fabrik GmbH and Co KG
Publication of EP0267898A1 publication Critical patent/EP0267898A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P13/00—Indicating or recording presence, absence, or direction, of movement
    • G01P13/0006—Indicating or recording presence, absence, or direction, of movement of fluids or of granulous or powder-like substances
    • 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
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
    • B01D46/2407—Filter candles
    • 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
    • B01D46/42—Auxiliary equipment or operation thereof
    • B01D46/44—Auxiliary equipment or operation thereof controlling filtration
    • B01D46/446—Auxiliary equipment or operation thereof controlling filtration by pressure measuring
    • 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
    • B01D46/66—Regeneration of the filtering material or filter elements inside the filter
    • B01D46/70—Regeneration of the filtering material or filter elements inside the filter by acting counter-currently on the filtering surface, e.g. by flushing on the non-cake side of the filter
    • B01D46/71—Regeneration of the filtering material or filter elements inside the filter by acting counter-currently on the filtering surface, e.g. by flushing on the non-cake side of the filter with pressurised gas, e.g. pulsed air
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2273/00—Operation of filters specially adapted for separating dispersed particles from gases or vapours
    • B01D2273/20—High temperature filtration

Definitions

  • the invention relates to a method for monitoring the flow of the cleaned gas stream emerging from a cup-shaped filter from the open top thereof and a device for carrying out this method with at least one cup-shaped filter.
  • filter containers are used in which a larger number of pot-shaped or candle-shaped ceramic filters are suspended next to one another in a perforated plate.
  • the perforated plate divides a large closed container into two Subspaces, the gas to be cleaned being introduced into the lower subspace and passing through the filter elements from the outside inwards.
  • the cleaned gas reaches the upper part of the container from the interior of the filter elements open at the top and is derived from it for further use.
  • a filter cleaning device which has cleaning tubes arranged above each filter element, which end immediately above the open end of the filter elements and can be connected to a gas source. Through these tubes, short bursts of gas can be introduced into the filter interior, which, contrary to the usual flow path of the gas, pass through the filter elements during filtration and clean the outside of these.
  • This object is achieved according to the invention in a method of the type described at the outset by determining the back pressure of the gas flowing out of the filter and from this the flow velocity thereof by means of a pitot tube which is arranged above the open top and is open to the inside of the filter.
  • the pitot tubes assigned to the individual filters are connected in succession with a single dynamic pressure measuring device.
  • these dynamic pressure measuring tubes being able to be connected in succession with only one measuring device, so that the overall design effort can be kept very low.
  • a great advantage of the described method lies in the fact that closing valves, which selectively connect the dynamic pressure tubes to the measuring device, can be arranged outside the high-temperature range, so that no special structural measures are necessary to protect these devices.
  • a pulse Cleaning pipe is used, and that this is alternately connected to a gas source generating a gas surge directed into the filter or to a dynamic pressure measuring device.
  • This design has the great advantage that the tubes provided in any case above the pulse element for pulse cleaning can simultaneously be used as back-up pressure tubes without significant modifications being necessary. It is sufficient if the cleaning pipes are provided with an additional, lockable connection possibility with the dynamic pressure measuring device.
  • a filter is automatically closed when the back pressure value of this filter exceeds a certain value.
  • This increase in the back pressure indicates that the flow rate at which the gas exits the filter element has become higher than can be the case with an undamaged filter, i.e. too high a back pressure value indicates damage to a filter element.
  • this undesired shunt can be eliminated by immediately closing the damaged filter automatically.
  • the invention is also based on the object of providing a device for carrying out the method described.
  • a device of the type described at the outset which is characterized by a dynamic pressure pipe which is open to the inside of the filter and arranged above the open filter and a dynamic pressure measuring device with. which the ram pressure pipe can be connected.
  • the dynamic pressure measuring device comprises a measuring line for determining the static pressure in the area above the filter and a subtraction element which determines the difference between the pressure in the dynamic pressure tube and the pressure in the measuring line. In this way, the dynamic pressure caused by the gas flow can be determined in a simple manner.
  • dynamic pressure pipes can be connected via closing valves to a gas source producing a gas surge which can be introduced into the filter and that the dynamic pressure pipes can be connected downstream of the closing valves to the dynamic pressure measuring device via lines which can be closed by further closing valves.
  • a control which opens the closing valves of different filters one after the other, with one filter only one of the closing valve for the gas source or the closing valve for the dynamic pressure measuring device being opened at the same time.
  • FIG. 1 shows a schematic view of a filter system with gas surge cleaning and dynamic pressure monitoring and - 8th -
  • FIG. 2 shows a view similar to FIG. 1 of a modified exemplary embodiment, in which only one filter element is shown to increase the overview.
  • the devices shown in the drawings comprise a closed container 1, which is subdivided into a lower part space 3 and an upper part space 4 by a perforated plate 2.
  • the lower part 3 is connected to a gas supply 5, the upper part 4 with a gas outlet 6.
  • a larger number of pot-shaped or candle-shaped filter elements 7 are suspended from above in the holes of the perforated plate 2, which preferably consist of a ceramic material and have an elongated, circular-cylindrical shape.
  • the number of these filter elements can be very large, adjacent filter elements hang closely together.
  • each tube 9 is arranged on the central axis of the filter element, which ends just above the open end 8 of the filter element 7 and is open in the direction of the filter element.
  • the diameter of the tubes 9 is smaller than the inside diameter of the filter elements 7, so that gas flowing out of the filter elements can escape past the tube 9 into the upper part space 4.
  • a closing valve 10 is arranged in each tube 9, for example an electrically actuable solenoid valve which can be actuated via a control line 11. These closing valves 10 close a connection of the tube 9 to a high-pressure gas source, not shown in the drawing, which can be common to all tubes 9.
  • a line 12 branches off from each tube 9, whereby all lines 12 of all tubes 9 combine to form a common measuring line 13.
  • a closing valve 14 is arranged in each line 12, for example an electrically actuable solenoid valve which can be actuated via a control line 15.
  • the common measuring line 13 leads to a dynamic pressure measuring device 16 which is connected to the upper part 4 of the container 1 via a second reference line 17.
  • gas to be cleaned flows under high pressure and high temperatures via the feed 5 into the lower subspace 3 and passes through the filter elements 7 from the outside inwards.
  • the cleaned gas exits at the top of the filter elements 7 into the upper part space 4 and leaves it through the outlet 6 for further use.
  • the closing valve 10 is closed in the tube 9 associated with this filter element, while the closing valve 14 is opened.
  • the pressure which builds up in the interior of the tube 9 and is composed of the static pressure in the outlet region and the back pressure of the flowing gas acts via the measuring line 13 on the back pressure measuring device 16, and the static line in the upper part 4 via the reference line 17 prevailing pressure is supplied.
  • the difference between these two pressure values is formed in a subtractor of the dynamic pressure measuring device, which is a measure of the dynamic pressure prevailing at the filter outlet, which in turn provides information about the outflow speed and the volume flow of the gas at the filter outlet.
  • the damaged circuit element can be automatically closed by the control circuit determining that the reference value has been exceeded, for example by placing a closure plate on the damaged filter element.
  • the control circuit can then automatically clean the filter element.
  • the closing valve 14 is closed and then the closing valve 10 is opened briefly, so that a gas surge through the pipe 9 reaches the interior of the corresponding filter element, which flows through the filter element in the opposite direction and thereby discharges on the outside of the filter ⁇ repels pollution.
  • the operating conditions of the filter elements are checked one after the other by opening the corresponding closing valves 14 in time and one after the other.
  • the operating state determined in each case can be made visible on a display panel, preferably on a screen 18, on which all filter elements are displayed. Appropriate symbols can be used to indicate normal operating status, increased contamination or damage, so that an operator can immediately recognize the respective operating status of the overall system.
  • cleaning is usually also carried out continuously during normal operation, certain filter elements being successively determined in each case by briefly opening the corresponding one Closing valve 10 are cleaned. It is advantageous if the cleaning by opening the closing valve 10 and the dynamic pressure determination by opening the closing valve 14 are carried out both in terms of time and location, ie in the case of a filter element, cleaning and dynamic pressure determinations take place at different times, while on the other hand cleaning and Back pressure determination can be carried out simultaneously at different locations on the perforated plate. In this way it is avoided that the cleaning and the dynamic pressure determination mutually influence one another in an undesirable manner.
  • the tubes 9 used as dynamic pressure measuring probes are repeatedly cleaned by the cyclical cleaning, i.e. one inevitably obtains measuring probes that clean themselves again and again without additional design effort.
  • the system can be operated under extreme conditions, i.e. at high pressures, very high or very low temperatures, with radiation exposure etc., since the actual measuring instruments can be arranged outside the critical range.
  • the measurement can be carried out during operation and provides reliable information about the operating state of each individual filter element. Retrofitting with little effort is also possible in the case of plants which are already standing, since the cleaning systems which are present anyway can be used as measuring probes.

Landscapes

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

Abstract

Afin de mettre en oeuvre un procédé de surveillance de l'écoulement du courant de gaz purifié sortant par la face supérieure ouverte d'un filtre en forme de pot, également à l'aide des installations actuelles sans modifier le filtre (7), il est proposé de déterminer la pression dynamique du courant de gaz sortant du filtre à l'aide d'un tube de Pitot (9) disposé au-dessus de la face supérieure et ouvert en direction du filtre. Un dispositif pour la mise en oeuvre de ce procédé est décrit.
EP86903229A 1986-05-30 1986-05-30 Procede et dispositif de surveillance de l'ecoulement d'un courant de gaz sortant d'un filtre Withdrawn EP0267898A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/DE1986/000226 WO1987007179A1 (fr) 1986-05-30 1986-05-30 Procede et dispositif de surveillance de l'ecoulement d'un courant de gaz sortant d'un filtre

Publications (1)

Publication Number Publication Date
EP0267898A1 true EP0267898A1 (fr) 1988-05-25

Family

ID=6790319

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86903229A Withdrawn EP0267898A1 (fr) 1986-05-30 1986-05-30 Procede et dispositif de surveillance de l'ecoulement d'un courant de gaz sortant d'un filtre

Country Status (2)

Country Link
EP (1) EP0267898A1 (fr)
WO (1) WO1987007179A1 (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4719791A (en) * 1986-12-05 1988-01-19 Ets, Inc. Individual filter bag monitoring system for baghouses
US4988368A (en) * 1989-12-28 1991-01-29 Shell Oil Company Method for determination of slag tap blockage
US4963163A (en) * 1989-12-28 1990-10-16 Shell Oil Company Determination of gasifier outlet and quench zone blockage
US5116395A (en) * 1991-07-09 1992-05-26 Pneumafil Corporation Dust collection with programmable cleaning air control
DE4226144A1 (de) * 1992-08-07 1994-02-10 Babcock Energie Umwelt Vorrichtung zur Überwachung von Filterelementen
DE4226145A1 (de) * 1992-08-07 1994-02-10 Babcock Energie Umwelt Verfahren zur Überwachung von Filterelemente
DE4226146A1 (de) * 1992-08-07 1994-02-10 Babcock Energie Umwelt Vorrichtung zum Filtern von heißen, staubbeladenen Gasen
US5391218A (en) * 1993-09-08 1995-02-21 Donaldson Company, Inc. Diagnostic and control system for dust collector
DE19819583A1 (de) * 1998-04-30 1999-11-11 Siemens Ag Luftfilter
DE10151269B4 (de) * 2001-10-17 2005-08-25 Sartorius Ag Verfahren zum Überwachen der Integrität von Filtrationsanlagen
CN107308748B (zh) * 2017-08-22 2018-03-23 新乡市新垣防腐保温制品有限公司 一种自动反吹除尘粉尘处理器

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB812244A (en) * 1956-07-09 1959-04-22 Metals Disintegrating Co A gas filtering apparatus
US3176449A (en) * 1961-12-06 1965-04-06 Buffalo Forge Co Reverse-jet type dust filter

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8707179A1 *

Also Published As

Publication number Publication date
WO1987007179A1 (fr) 1987-12-03

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Inventor name: REINHARDT, ALEXANDER, MARIA