EP2889089A1 - Method and apparatus for cleaning an electrofilter - Google Patents
Method and apparatus for cleaning an electrofilter Download PDFInfo
- Publication number
- EP2889089A1 EP2889089A1 EP14195633.4A EP14195633A EP2889089A1 EP 2889089 A1 EP2889089 A1 EP 2889089A1 EP 14195633 A EP14195633 A EP 14195633A EP 2889089 A1 EP2889089 A1 EP 2889089A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- liquid
- cleaning
- exhaust gas
- ash container
- electrostatic precipitator
- 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
Links
- 238000004140 cleaning Methods 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000007788 liquid Substances 0.000 claims abstract description 72
- 239000012717 electrostatic precipitator Substances 0.000 claims abstract description 28
- 238000010304 firing Methods 0.000 claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000004449 solid propellant Substances 0.000 claims abstract description 10
- 239000012535 impurity Substances 0.000 claims abstract description 6
- 239000008188 pellet Substances 0.000 claims abstract description 6
- 238000002347 injection Methods 0.000 claims description 25
- 239000007924 injection Substances 0.000 claims description 25
- 238000001704 evaporation Methods 0.000 claims description 15
- 230000008020 evaporation Effects 0.000 claims description 15
- 238000000746 purification Methods 0.000 claims description 10
- 239000007787 solid Substances 0.000 claims description 9
- 238000002485 combustion reaction Methods 0.000 claims description 8
- 238000009834 vaporization Methods 0.000 claims description 5
- 230000008016 vaporization Effects 0.000 claims description 5
- 239000002699 waste material Substances 0.000 claims description 3
- 239000007789 gas Substances 0.000 description 30
- 239000002956 ash Substances 0.000 description 28
- 239000002245 particle Substances 0.000 description 10
- 239000000428 dust Substances 0.000 description 8
- 230000008021 deposition Effects 0.000 description 4
- 239000012530 fluid Substances 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 238000007600 charging Methods 0.000 description 2
- 238000012958 reprocessing Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000008399 tap water Substances 0.000 description 2
- 235000020679 tap water Nutrition 0.000 description 2
- 239000002028 Biomass Substances 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 230000009849 deactivation Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000007786 electrostatic charging Methods 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000008400 supply water Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/34—Constructional details or accessories or operation thereof
- B03C3/74—Cleaning the electrodes
- B03C3/78—Cleaning the electrodes by washing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/02—Plant or installations having external electricity supply
- B03C3/16—Plant or installations having external electricity supply wet type
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/34—Constructional details or accessories or operation thereof
- B03C3/40—Electrode constructions
- B03C3/41—Ionising-electrodes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/34—Constructional details or accessories or operation thereof
- B03C3/40—Electrode constructions
- B03C3/45—Collecting-electrodes
- B03C3/49—Collecting-electrodes tubular
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/34—Constructional details or accessories or operation thereof
- B03C3/66—Applications of electricity supply techniques
- B03C3/68—Control systems therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/34—Constructional details or accessories or operation thereof
- B03C3/82—Housings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/34—Constructional details or accessories or operation thereof
- B03C3/88—Cleaning-out collected particles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C2201/00—Details of magnetic or electrostatic separation
- B03C2201/08—Ionising electrode being a rod
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C2201/00—Details of magnetic or electrostatic separation
- B03C2201/24—Details of magnetic or electrostatic separation for measuring or calculating parameters, efficiency, etc.
Definitions
- the invention relates to a method for cleaning an electrostatic filter for the exhaust gas purification of solid fuel firing, in particular pellet firing, wherein a defined amount of cleaning liquid, in particular water, is sprayed onto the electrostatic precipitator at certain time intervals and impurities are washed off on at least one electrode of the electrostatic precipitator by the cleaning liquid. Furthermore, the invention relates to a cleaning device for cleaning an electrostatic precipitator for the purification of solids firing, in particular pellet firing, with at least one controlled by a control device injector to spray a defined amount of cleaning liquid at certain time intervals on the electrostatic precipitator and wash off impurities on the electrostatic precipitator, and an ash container for Collect the solid combustion residues.
- WO 10/057488 A1 From the WO 10/057488 A1 is a wet-cleaning electrostatic precipitator for exhaust gas purification for the exhaust gases of biomass combustion known, in which the electrostatic precipitator has a Abscheidhunt through which the exhaust gas is passed, wherein in the region of the Abscheidhunt or adjacent to this a charging device for electrostatic charging of located in the exhaust Particles is arranged.
- a separation device In the region of the deposition chamber, a separation device is arranged, through which the charged particles flow, wherein a discharge device for a cleaning liquid sprays the region of the deposition device periodically and cleans the particles deposited on the surface of the deposition device.
- the cleaning fluid formed by, for example, water is passed into the sewage network or reused.
- the dirty water with the impurities washed off by the electrostatic precipitator can contain problematic substances, such as heavy metals, which must not be disposed of via the sewer system.
- a reprocessing of the dirty water is - especially for small systems - expensive because a variety of components such as pumping equipment, etc. are required.
- the object of the invention is to avoid these disadvantages and to allow a cost-effective and environmentally friendly cleaning of the electrostatic precipitator.
- this is achieved by collecting the dirty liquid draining from the electrostatic precipitator in an ash container, and by causing the entire liquid portion of the collected dirty liquid in the ash container to evaporate or evaporate.
- the drainage running ash container is placed under the electrostatic precipitator so that the entire Dirty liquid draining from the electrostatic filter can be collected in the ash container, and the entire liquid content of the collected dirty liquid in the ash container can evaporate or evaporate.
- the heat for evaporation or vaporization of the liquid fraction in the dirty liquid is preferably provided by the exhaust gas.
- the cleaning liquid in particular tap water from the existing water pipe with the available water pipe pressure, passed through a solenoid valve to the injector and the polluted surface of the electrostatic precipitator is supplied with the cleaning liquid via injectors, whereby adhering dirt is removed.
- the dirty liquid flows or drips downwards and enters the ash container arranged below the electrostatic precipitator.
- the liquid content of the dirty liquid is evaporated or evaporated, so that only the solid portions remain in the ash container and occasionally together the solid combustion residues in a conventional manner, for example with the residual waste, can be disposed of.
- the residual moisture in the ash container can be measured via a moisture sensor. If this residual moisture is too high immediately before a planned further injection of the cleaning liquid and is above a defined limit value, then the following injection of the cleaning liquid is not released and thus fails.
- Fig. 1 schematically shows a furnace 1 of a solid fuel 2, for example, for combustion of fuel pellets, with an arranged between the solid fuel 2 and a chimney 3 exhaust pipe 5.
- a cleaning module 6 is arranged, wherein within the housing 7 of the cleaning module 6, a high voltage unit and an electrostatic filter 9 having a positive precipitating electrode 10 formed by, for example, a sheath electrode and a negative spraying electrode 11 formed by a center electrode, for example, are disposed in the exhaust gas flow path 12.
- the collecting electrode 10 is arranged substantially vertically.
- the flow also takes place within the electrostatic precipitator 9 in the vertical direction.
- the flow within the cleaning module 6 is indicated by arrows S.
- Upstream, ie below, of the electrostatic precipitator 9, an ash container 13, which can be removed from the housing 7, is provided for catching fly ash, which forms an ash collecting space 14.
- an insulator for the power supply to the spray electrode 11 is designated.
- the electrostatic filter 9 serves for the separation of the particles in the exhaust gas and works in a known manner on the basis of the electrostatic principle.
- the deposition in the electrostatic filter 9 comprises the steps: release of electrical charges, Charging the dust particles in the electric field, transporting the charged dust particles to the collecting electrode 10, adhering the dust particles to the collecting electrode 10 and removing the dust layer from the collecting electrode 10.
- a cleaning device 15 which has an injection device 16 for a cleaning liquid, for example water.
- a cleaning liquid for example water.
- the example fed with tap water a supply water line injector 16 is disposed in the ash collecting space 14 below the electrostatic precipitator 9.
- the cleaning liquid can be injected via one or more nozzles 17 up to the collecting electrode 10, whereby the adhering dust particles are washed off.
- the dirty cleaning liquid - the dirty liquid - flows through its own weight along with the entrained dust particles along the collecting electrode 10 down and on into the ash container 13.
- the trained as removable from the housing 7 tray ash tray 13 is executed without running, so that the collected waste liquid remains in the ash container 13, so neither a sewer system, nor a reprocessing system is supplied.
- the exhaust gas emitted from the solid fuel 2 passes through the inlet opening 18 in the cleaning module 6, is guided through a downpipe 19 down in and horizontally through the ash tray 13 formed by the ash tray 13, wherein it sweeps over the surface of the collected in the ash container 13 dirty liquid and these are heated. Thereafter, the exhaust gas is deflected upward and flows through the inlet hopper 20 into the electrostatic precipitator 9, wherein dust particles are charged and adhered to the collecting electrode 10. After passing through the electrostatic precipitator 9, the exhaust gas leaves the cleaning module 6 through the outlet 21 and is finally fed to the chimney 3.
- the exhaust gas temperature T A must be sufficiently high. Therefore, it is advantageous if the exhaust gas temperature T A is measured via at least one temperature sensor 22 and / or the moisture of the residues in the ash container 13 via a humidity sensor 23 and a control unit 24 is supplied. If the exhaust gas temperature T A below a limit of, for example, 100 ° C, or indicates the moisture sensor too high a water content in the ash of the ash container 13, so there is no further injection of the cleaning liquid until the exhaust gas temperature and / or the moisture content is back within the desired range ,
- the time interval t R between two injection events is thus dependent on the exhaust gas temperature T A , the exhaust gas volume, the surface of the dirty liquid in the ash container 13, and / or the collected amount of dirty liquid.
- the control unit 24 calculates the time interval t R and controls the injection of the cleaning fluid via at least one valve 25 formed, for example, by a magnetic valve.
- the control unit 24 controls the switching on and off of the current for the electrostatic filter 9, as well as the injection of the cleaning liquid.
- the electrostatic filter 9 is always turned on when the solid fuel firing is in operation, so even during startup and shutdown of the furnace 1 system, but not with deactivated solid fuel 2.
- the control unit 23 is a cleaning program - time-controlled and / or by the exhaust gas temperature T.
- the drying time .DELTA.t F for the electric filter 9 may for example be 5 to 30 minutes.
- the turn-on time t F for the electrostatic filter 9 may then be more than 2 hours, for example.
- a cleaning of the electrostatic filter 9 can for example be done 1 to 4 times a day.
- a quantity of cleaning liquid of, for example, 0.5 liters per injection process is sufficient.
- water is injected under the available line pressure, whereby feed pumps can be dispensed with. If the line pressure is too low, it is of course also possible to use a self-pump for injection.
Abstract
Die Erfindung betrifft ein Verfahren zum Reinigen eines Elektrofilters (9) für die Abgasreinigung von Feststofffeuerungen (2), insbesondere Pelletsfeuerungen, wobei eine definierte Menge an Reinigungsflüssigkeit, insbesondere Wasser, in bestimmten Zeitabständen auf den Elektrofilter (9) aufgespritzt wird und Verunreinigungen auf zumindest einer Elektrode (10, 11) des Elektrofilters (9) durch die Reinigungsflüssigkeit abgewaschen werden.The invention relates to a method for cleaning an electrostatic filter (9) for the exhaust gas cleaning of solid fuel firings (2), in particular pellet firing, wherein a defined amount of cleaning liquid, in particular water, is sprayed on the electrostatic precipitator (9) at certain time intervals and impurities on at least one Electrode (10, 11) of the electrostatic precipitator (9) are washed off by the cleaning liquid.
Eine kostengünstige und umweltverträgliche Reinigung des Elektrofilters (9) wird ermöglicht, wenn die vom Elektrofilter (9) abfließende Schmutzflüssigkeit in einem Aschebehälter (13) gesammelt wird und der gesamte Flüssigkeitsanteil der gesammelten Schmutzflüssigkeit im Aschebehälter (13) zum Verdunsten oder Verdampfen gebracht wird. A cost-effective and environmentally friendly cleaning of the electrostatic precipitator (9) is made possible when the dirty liquid flowing from the electrostatic filter (9) is collected in an ash container (13) and the entire liquid content of the collected dirty liquid in the ash container (13) is brought to evaporate or evaporate.
Description
Die Erfindung betrifft ein Verfahren zum Reinigen eines Elektrofilters für die Abgasreinigung von Feststofffeuerungen, insbesondere Pelletsfeuerungen, wobei eine definierte Menge an Reinigungsflüssigkeit, insbesondere Wasser, in bestimmten Zeitabständen auf den Elektrofilter aufgespritzt wird und Verunreinigungen auf zumindest einer Elektrode des Elektrofilters durch die Reinigungsflüssigkeit abgewaschen werden. Weiters betrifft die Erfindung eine Reinigungsvorrichtung zum Reinigen eines Elektrofilters für die Abgasreinigung von Feststofffeuerungen, insbesondere Pelletsfeuerungen, mit zumindest einer durch eine Steuereinrichtung gesteuerten Einspritzeinrichtung, um eine definierte Menge Reinigungsflüssigkeit in bestimmten Zeitabständen auf den Elektrofilter aufzuspritzen und Verunreinigungen am Elektrofilter abzuwaschen, sowie einen Aschebehälter zum Sammeln der festen Verbrennungsrückstände.The invention relates to a method for cleaning an electrostatic filter for the exhaust gas purification of solid fuel firing, in particular pellet firing, wherein a defined amount of cleaning liquid, in particular water, is sprayed onto the electrostatic precipitator at certain time intervals and impurities are washed off on at least one electrode of the electrostatic precipitator by the cleaning liquid. Furthermore, the invention relates to a cleaning device for cleaning an electrostatic precipitator for the purification of solids firing, in particular pellet firing, with at least one controlled by a control device injector to spray a defined amount of cleaning liquid at certain time intervals on the electrostatic precipitator and wash off impurities on the electrostatic precipitator, and an ash container for Collect the solid combustion residues.
Aus der
Das Schmutzwasser mit den vom Elektrofilter abgewaschenen Verunreinigungen kann aber Problemstoffe wie beispielsweise Schwermetalle enthalten, welche nicht über das Kanalnetz entsorgt werden dürfen. Eine Wiederaufbereitung des Schmutzwassers ist aber - insbesondere für Kleinanlagen - teuer, da eine Vielzahl von Komponenten wie Pumpen Einigungseinrichtungen, etc. erforderlich sind.However, the dirty water with the impurities washed off by the electrostatic precipitator can contain problematic substances, such as heavy metals, which must not be disposed of via the sewer system. However, a reprocessing of the dirty water is - especially for small systems - expensive because a variety of components such as pumping equipment, etc. are required.
Aufgabe der Erfindung ist es, diese Nachteile zu vermeiden und eine kostengünstige und umweltverträgliche Reinigung des Elektrofilters zu ermöglichen.The object of the invention is to avoid these disadvantages and to allow a cost-effective and environmentally friendly cleaning of the electrostatic precipitator.
Erfindungsgemäß wird dies dadurch erreicht, dass die vom Elektrofilter abfließende Schmutzflüssigkeit in einem Aschebehälter gesammelt wird, und dass der gesamte Flüssigkeitsanteil der gesammelten Schmutzflüssigkeit im Aschebehälter zum Verdunsten oder Verdampfen gebracht wird. Der ablauflos ausgeführte Aschebehälter ist dabei so unter dem Elektrofilter angeordnet, dass die gesamte vom Elektrofilter abfließende Schmutzflüssigkeit im Aschebehälter gesammelt werden kann, und der gesamte Flüssigkeitsanteil der gesammelten Schmutzflüssigkeit im Aschebehälter verdunsten bzw. verdampfen kann.According to the invention, this is achieved by collecting the dirty liquid draining from the electrostatic precipitator in an ash container, and by causing the entire liquid portion of the collected dirty liquid in the ash container to evaporate or evaporate. The drainage running ash container is placed under the electrostatic precipitator so that the entire Dirty liquid draining from the electrostatic filter can be collected in the ash container, and the entire liquid content of the collected dirty liquid in the ash container can evaporate or evaporate.
Die Wärme zum Verdunsten bzw. Verdampfen des Flüssigkeitsanteils in der Schmutzflüssigkeit wird vorzugsweise durch das Abgas bereitgestellt. Somit sind keine externen Heizeinrichtung zum Beheizen des Aschebehälters erforderlich. Bevorzugt wird die Reinigungsflüssigkeit, insbesondere Leitungswasser aus der vorhandenen Wasserleitung mit dem zur Verfügung stehenden Wasserleitungsdruck, über ein Magnetventil zur Einspritzeinrichtung geführt und über Einspritzdüsen die verschmutzte Oberfläche des Elektrofilters mit der Reinigungsflüssigkeit beaufschlagt, wodurch anhaftender Schmutz entfernt wird. Die Schmutzflüssigkeit fließt bzw. tropft nach unten ab und gelangt in den unter dem Elektrofilter angeordnete Aschebehälter. Im Aschebehälter wird der Flüssigkeitsanteil der Schmutzflüssigkeit verdunstet bzw. verdampft, so dass nur mehr die festen Anteile im Aschebehälter verbleiben und gelegentlich gemeinsam den festen Verbrennungsrückständen in herkömmlicher Weise, zum Beispiel mit dem Restmüll, entsorgt werden können.The heat for evaporation or vaporization of the liquid fraction in the dirty liquid is preferably provided by the exhaust gas. Thus, no external heater is needed to heat the ash box. Preferably, the cleaning liquid, in particular tap water from the existing water pipe with the available water pipe pressure, passed through a solenoid valve to the injector and the polluted surface of the electrostatic precipitator is supplied with the cleaning liquid via injectors, whereby adhering dirt is removed. The dirty liquid flows or drips downwards and enters the ash container arranged below the electrostatic precipitator. In the ash container, the liquid content of the dirty liquid is evaporated or evaporated, so that only the solid portions remain in the ash container and occasionally together the solid combustion residues in a conventional manner, for example with the residual waste, can be disposed of.
Eine vollständige Verdunstung bzw. Verdampfung der Schmutzflüssigkeit kann ermöglicht werden, wenn der Zeitabstand zwischen zwei Einspritzungen der Reinigungsflüssigkeit in Abhängigkeit von der Abgastemperatur, vom Abgasvolumen, der Oberfläche der Schmutzflüssigkeit im Aschebehälter, und/oder der gesammelten Schmutzflüssigkeitsmenge bestimmt wird. Insbesondere kann der Zeitabstand tR zwischen zwei Einspritzvorgängen der Reinigungsflüssigkeit nach folgender Gleichung berechnet werden:
wobei
-
T A - der Mittelwert der Abgastemperatur über der gesamten Betriebszeit der Feuerung und
- k
- ein die Verdampfungswärme, den Abgasvolumenstrom, die Oberfläche der Schmutzflüssigkeit in der Aschelade, und die zu verdampfende Schmutzflüssigkeitsmenge berücksichtigender Rechenfaktor ist.
in which
-
T A - the average of the exhaust gas temperature over the entire operating time of the furnace and
- k
- is the heat of vaporization, the exhaust gas flow rate, the surface of the dirty liquid in the ashtray, and the calculation of the amount of dirty liquid to be evaporated.
Wesentlich ist, dass zwischen zwei Einspritzvorgängen genügend Zeit zur Verfügung steht, um eine vollständige Verdunstung bzw. Verdampfung des Schmutzwassers zu bewirken. Über einen Feuchtigkeitssensor kann gegebenenfalls die Restfeuchtigkeit im Aschebehälter gemessen werden. Ist diese Restfeuchtigkeit unmittelbar vor einer geplanten weiteren Einspritzung der Reinigungsflüssigkeit zu hoch und liegt über einem definierten Grenzwert, so wird die folgende Einspritzung der Reinigungsflüssigkeit nicht frei gegeben und fällt somit aus.It is essential that sufficient time is available between two injection processes to effect complete evaporation or evaporation of the dirty water. If necessary, the residual moisture in the ash container can be measured via a moisture sensor. If this residual moisture is too high immediately before a planned further injection of the cleaning liquid and is above a defined limit value, then the following injection of the cleaning liquid is not released and thus fails.
Die Erfindung wird im Folgenden anhand der Fig. näher erläutert. Es zeigen:
- Fig. 1
- schematisch eine Feuerungsanlage einer Feststofffeuerung mit einem Abgasreinigungsmodul;
- Fig. 2
- den Abgasreinigungsmodul mit der Vorrichtung zum Reinigen eines Elektrofilters in einer Schrägansicht i;
- Fig. 3
- den Abgasreinigungsmodul ohne Modulgehäuse in einer Schrägansicht;
- Fig. 4
- den Abgasreinigungsmodul in einer Schrägansicht in einem Schnitt gemäß der Linie IV - IV in
Fig. 5 ; - Fig. 5
- den Abgasreinigungsmodul in einer Schrägansicht in einem Schnitt gemäß der Linie V - V in
Fig. 4 ; - Fig. 6
- den Abgasreinigungsmodul in einem Schnitt gemäß der Linie VI - VI in
Fig. 7 ; - Fig. 7
- den Abgasreinigungsmodul in einer Seitenansicht; und
- Fig. 8
- die Steuerung der Einspritzung der Reinigungsflüssigkeit während des Betriebes.
- Fig. 1
- schematically a firing system of a solid fuel with an exhaust gas purification module;
- Fig. 2
- the exhaust gas purification module with the device for cleaning an electrostatic filter in an oblique view i;
- Fig. 3
- the exhaust gas purification module without module housing in an oblique view;
- Fig. 4
- the exhaust gas purification module in an oblique view in a section along the line IV - IV in
Fig. 5 ; - Fig. 5
- the exhaust gas cleaning module in an oblique view in a section along the line V - V in
Fig. 4 ; - Fig. 6
- the emission control module in a section along the line VI - VI in
Fig. 7 ; - Fig. 7
- the exhaust gas purification module in a side view; and
- Fig. 8
- the control of the injection of the cleaning liquid during operation.
Die Elektrofilter 9 dient zur Abscheidung vom Partikeln im Abgas und arbeitet in bekannter Weise auf der Basis des elektrostatischen Prinzips. Die Abscheidung im Elektrofilter 9 beinhaltet die Schritte: Freisetzung von elektrischen Ladungen, Aufladung der Staubpartikel im elektrischen Feld, Transport der geladenen Staubteilchen zur Niederschlagselektrode 10, Anhaftung der Staubpartikel an der Niederschlagselektrode 10 und Entfernung der Staubschicht von der Niederschlagselektrode 10.The
Zur Entfernung der an der Niederschlagelektroden 10 anhaftenden Staubschicht ist eine Reinigungsvorrichtung 15 vorgesehen, welche eine Einspritzeinrichtung 16 für eine Reinigungsflüssigkeit, beispielsweise Wasser, aufweist. Die beispielsweise mit Leitungswasser einer Versorgungswasserleitung gespeiste Einspritzeinrichtung 16 ist im Ascheauffangraum 14 unterhalb des Elektrofilters 9 angeordnet. Über die Einspritzeinrichtung 16 kann die Reinigungsflüssigkeit über eine oder mehrere Düsen 17 nach oben auf die Niederschlagselektrode 10 gespritzt werden, wodurch die anhaftenden Staubpartikel abgewaschen werden. Die verschmutzte Reinigungsflüssigkeit - die Schmutzflüssigkeit - fließt durch das eigene Gewicht samt dem mitgerissenen Staubpartikeln entlang der Niederschlagselektrode 10 nach unten und weiter in den Aschebehälter 13.To remove the dust layer adhering to the
Der als aus dem Gehäuse 7 entfernbare Lade ausgebildete Aschebehälter 13 ist ablauflos ausgeführt, so dass die gesammelte Schmutzflüssigkeit im Aschebehälter 13 verbleibt, also weder einem Abwassersystem, noch einem Wiederaufbereitungssystem zugeführt wird.The trained as removable from the
Das aus der Feststofffeuerung 2 emittierte Abgas gelangt über die Eintrittsöffnung 18 in den Reinigungsmodul 6, wird über ein Fallrohr 19 nach unten in und horizontal durch den durch den Aschebehälter 13 gebildeten Ascheauffangraum 14 geführt, wobei es die Oberfläche der im Aschebehälter 13 aufgefangenen Schmutzflüssigkeit überstreicht und diese erwärmt. Danach wird das Abgas nach oben umgelenkt und strömt durch den Einlauftrichter 20 in den Elektrofilter 9, wobei Staubpartikel aufgeladen werden und an der Niederschlagselektrode 10 anhaften. Nach Passieren des Elektrofilters 9 verlässt das Abgas den Reinigungsmodul 6 durch den Austritt 21 und wird schließlich dem Kamin 3 zugeführt.The exhaust gas emitted from the
Beim Durchströmen des Ascheauffangraumes 14 durch das Abgas wird Wärme an die Schmutzflüssigkeit abgegeben und ein Verdunsten bzw. Verdampfen dieser bewirkt. Nach dem vollständigen Verdunsten bzw. Verdampfen der Flüssigkeitsanteile der Schmutzflüssigkeit verbleiben die abgewaschenen festen Bestandteile im Aschebehälter 13 und können problemlos mit den festen Verbrennungsrückständen entsorgt werden.As it flows through the
Um ein vollständiges Verdunsten bzw. Verdampfen der Schmutzflüssigkeit zu erreichen ist es wesentlich, dass jeweils zwischen zwei Einspritzvorgängen genug Zeit bleibt, um ein vollständiges Verdunsten bzw. Verdampfen zu ermöglichen. Weiters muss die Abgastemperatur TA ausreichend hoch sein. Daher ist es vorteilhaft, wenn die Abgastemperatur TA über zumindest einen Temperatursensor 22 und/oder die Feuchtigkeit der Rückstände im Aschebehälter 13 über einen Feuchtigkeitssensor 23 gemessen wird und einer Steuereinheit 24 zugeführt wird. Ist die Abgastemperatur TA unterhalb eines Grenzwertes von beispielsweise 100°C, oder zeigt der Feuchtigkeitssensor einen zu hohen Wassergehalt in der Asche des Aschebehälters 13 an, so erfolgt keine weitere Einspritzung der Reinigungsflüssigkeit, bis die Abgastemperatur und/oder der Feuchtigkeitsgehalt wieder im Sollbereich liegt.In order to achieve complete evaporation or vaporization of the dirty liquid, it is essential that enough time remains between two injection processes to allow complete evaporation or evaporation. Furthermore, the exhaust gas temperature T A must be sufficiently high. Therefore, it is advantageous if the exhaust gas temperature T A is measured via at least one
Der Zeitabstand tR zwischen zwei Einspritzvorgängen ist somit abhängig von der Abgastemperatur TA, vom Abgasvolumen, der Oberfläche der Schmutzflüssigkeit im der Aschebehälter 13, und/oder der gesammelten Schmutzflüssigkeitsmenge.The time interval t R between two injection events is thus dependent on the exhaust gas temperature T A , the exhaust gas volume, the surface of the dirty liquid in the
Für die Ermittlung des Zeitabstandes tR zwischen zwei Einspritzvorgängen der Reinigungsflüssigkeit kann folgende Gleichung verwendet werden:
wobei
-
T A - der Mittelwert der Abgastemperatur TA über der gesamten Betriebszeit der Feuerung und
- k
- ein die Verdampfungswärme, den Abgasvolumenstrom, die Oberfläche der Schmutzflüssigkeit im Aschebehälter und die zu verdampfende Schmutzflüssigkeitsmenge berücksichtigender Rechenfaktor
in which
-
T A - the average value of the exhaust gas temperature T A over the entire operating time of the furnace and
- k
- a calculation of the heat of vaporization, the exhaust gas volume flow, the surface of the dirty liquid in the ash container and the amount of dirty liquid to be evaporated
Die Steuereinheit 24 berechnet den Zeitabstand tR und steuert über zumindest ein beispielsweise durch ein Magnetventil gebildetes Ventil 25 die Einspritzung der Reinigungsflüssigkeit.The
Die Steuereinheit 24 steuert das Ein- und Ausschalten des Stromes für den Elektrofilter 9, sowie die Einspritzung der Reinigungsflüssigkeit. Grundsätzlich ist der Elektrofilter 9 stets eingeschalten, wenn die Feststofffeuerung in Betrieb ist, also auch während des Anfahrens und Abfahrens der Feuerungsanlage 1 Anlage, aber nicht bei deaktivierter Feststofffeuerung 2. Durch die Steuereinheit 23 wird ein Reinigungsprogramm - zeitgesteuert und/oder durch die Abgastemperatur TA gesteuert - gefahren und dabei der Elektrofilter 9 abgeschaltet und die Einspritzeinrichtung 16 über das Ventil 24 kurz - zum Beispiel für 0,5 bis 1 Sekunden eingeschaltet. Mit dem erneuten Einschalten des Elektrofilters 9 wird gewartet, bis dieser wieder weitgehend abgetrocknet ist. Die Trocknungsdauer ΔtF für den Elektrofilter 9 kann beispielsweise 5 bis 30 Minuten betragen. Die Einschaltzeit tF für den Elektrofilter 9 kann dann zum Beispiel mehr als 2 Stunden betragen. Eine Reinigung des Elektrofilters 9 kann beispielsweise 1 bis 4 mal pro Tag erfolgen. Für kleinere bis mittlere Hausfeuerungsanlagen reicht beispielsweise eine Reinigungsflüssigkeitsmenge von beispielsweise 0,5 Liter pro Einspritzvorgang. Bevorzugt wird als Reinigungsflüssigkeit Wasser unter dem zur Verfügung stehenden Leitungsdruck eingespritzt, wodurch Speisepumpen entfallen können. Falls der Leitungsdruck zu gering ist, kann selbstverständlich zur Einspritzung auch eine eigen Pumpe verwendet werden.The
In
- E= 1,
- F=0 und
- G=1
- E = 1,
- F = 0 and
- G = 1
Claims (10)
wobei
in which
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ATA50858/2013A AT514928B1 (en) | 2013-12-27 | 2013-12-27 | Method for cleaning an electrostatic precipitator |
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EP2889089A1 true EP2889089A1 (en) | 2015-07-01 |
EP2889089B1 EP2889089B1 (en) | 2017-08-23 |
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Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1382037A (en) * | 1917-08-11 | 1921-06-21 | Int Precipitation Co | Process and apparatus for recovering soluble constituents from furnace-fumes |
DE2138247A1 (en) * | 1970-08-01 | 1972-02-10 | Masuda Senichi | Electric dust collector |
DE2749886A1 (en) * | 1977-11-08 | 1979-05-10 | Saarberg Hoelter | Salt load disposal in flue gas desulphurisation plant - by spraying saturated wash water upstream of electrofilter |
DE3307999A1 (en) * | 1982-06-01 | 1984-09-13 | Frank Dieter Dipl.-Phys. Dr. 8000 München Peschanel | Process and plant for decreasing pollutants in gases |
US6193782B1 (en) * | 1999-03-30 | 2001-02-27 | Croll Reynolds Clean Air Technologies, Inc. | Modular condensing wet electrostatic precipitators and method |
US6294003B1 (en) * | 1999-03-30 | 2001-09-25 | Croll Reynolds Clean Air Technologies, Inc. | Modular condensing wet electrostatic precipitators |
US6488740B1 (en) * | 2000-03-01 | 2002-12-03 | Electric Power Research Institute, Inc. | Apparatus and method for decreasing contaminants present in a flue gas stream |
WO2010057488A1 (en) | 2008-11-20 | 2010-05-27 | Fachhochschule Gelsenkirchen | Wet-cleaning electrostatic filter for cleaning exhaust gas and a suitable method for the same |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT406024B (en) * | 1995-05-02 | 2000-01-25 | Scheuch Alois Gmbh | SYSTEM FOR ELECTROSTATIC CLEANING OF DUST-CONTAINED EXHAUST GAS |
US8092578B2 (en) * | 2008-08-25 | 2012-01-10 | Eisenmann Corporation | Method and apparatus for eliminating or reducing waste effluent from a wet electrostatic precipitator |
FI20096157A (en) * | 2009-11-06 | 2011-05-07 | Lo Group Oy | Procedure for cleaning an electric filter cell in an air purifier |
-
2013
- 2013-12-27 AT ATA50858/2013A patent/AT514928B1/en active
-
2014
- 2014-12-01 EP EP14195633.4A patent/EP2889089B1/en active Active
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1382037A (en) * | 1917-08-11 | 1921-06-21 | Int Precipitation Co | Process and apparatus for recovering soluble constituents from furnace-fumes |
DE2138247A1 (en) * | 1970-08-01 | 1972-02-10 | Masuda Senichi | Electric dust collector |
DE2749886A1 (en) * | 1977-11-08 | 1979-05-10 | Saarberg Hoelter | Salt load disposal in flue gas desulphurisation plant - by spraying saturated wash water upstream of electrofilter |
DE3307999A1 (en) * | 1982-06-01 | 1984-09-13 | Frank Dieter Dipl.-Phys. Dr. 8000 München Peschanel | Process and plant for decreasing pollutants in gases |
US6193782B1 (en) * | 1999-03-30 | 2001-02-27 | Croll Reynolds Clean Air Technologies, Inc. | Modular condensing wet electrostatic precipitators and method |
US6294003B1 (en) * | 1999-03-30 | 2001-09-25 | Croll Reynolds Clean Air Technologies, Inc. | Modular condensing wet electrostatic precipitators |
US6488740B1 (en) * | 2000-03-01 | 2002-12-03 | Electric Power Research Institute, Inc. | Apparatus and method for decreasing contaminants present in a flue gas stream |
WO2010057488A1 (en) | 2008-11-20 | 2010-05-27 | Fachhochschule Gelsenkirchen | Wet-cleaning electrostatic filter for cleaning exhaust gas and a suitable method for the same |
Also Published As
Publication number | Publication date |
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AT514928A4 (en) | 2015-05-15 |
AT514928B1 (en) | 2015-05-15 |
EP2889089B1 (en) | 2017-08-23 |
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