EP0415486A1 - Procédé et appareil pour la purification électrostatique d'effluents de gaz nocifs et poussiéreux dans des séparateurs à plusieurs champs - Google Patents

Procédé et appareil pour la purification électrostatique d'effluents de gaz nocifs et poussiéreux dans des séparateurs à plusieurs champs Download PDF

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Publication number
EP0415486A1
EP0415486A1 EP90202257A EP90202257A EP0415486A1 EP 0415486 A1 EP0415486 A1 EP 0415486A1 EP 90202257 A EP90202257 A EP 90202257A EP 90202257 A EP90202257 A EP 90202257A EP 0415486 A1 EP0415486 A1 EP 0415486A1
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EP
European Patent Office
Prior art keywords
stage
precipitation
liquid
electrodes
precipitation electrodes
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
EP90202257A
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German (de)
English (en)
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EP0415486B1 (fr
Inventor
Karl Steinbacher
Hermann Schmidt
Wilhelm Leussler
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GEA Group AG
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Metallgesellschaft AG
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Filing date
Publication date
Priority claimed from DE3928808A external-priority patent/DE3928808C1/de
Priority claimed from DE19904004357 external-priority patent/DE4004357C1/de
Priority claimed from DE19904023723 external-priority patent/DE4023723C1/de
Application filed by Metallgesellschaft AG filed Critical Metallgesellschaft AG
Priority to AT90202257T priority Critical patent/ATE102852T1/de
Publication of EP0415486A1 publication Critical patent/EP0415486A1/fr
Application granted granted Critical
Publication of EP0415486B1 publication Critical patent/EP0415486B1/fr
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    • 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
    • B03C3/45—Collecting-electrodes
    • B03C3/53—Liquid, or liquid-film, 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
    • B03C3/017—Combinations of electrostatic separation with other processes, not otherwise provided for
    • 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
    • B03C3/025—Combinations of electrostatic separators, e.g. in parallel or in series, stacked separators or dry-wet separator combinations
    • 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
    • B03C3/76—Cleaning the electrodes by using a mechanical vibrator, e.g. rapping gear ; by using impact
    • 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

Definitions

  • the invention relates to a process for the electrostatic cleaning of dust and pollutant-containing exhaust gases in multi-field separators, the exhaust gases in the flow direction being first subjected to dry electrostatic cleaning in gas lanes formed from plate-shaped precipitation electrodes and then in a second stage by one or more Fields with liquid-wetted, gas lanes forming precipitation electrodes are passed and to a device for performing the method.
  • GB-PS 988,350 describes a method for electrical dust separation in which a drying tower, one or more dry-working electrical fields and one or more wet-working electrical fields are arranged one behind the other.
  • the water sprayed through nozzles into the wet field (s) flows off as cloudy, is thickened by thickener and injected into the drying tower by steam or compressed air, where the evaporated liquid humidifies the hot dryer gas and thus prevents spraying back in the dry working fields.
  • US Pat. No. 1,766,422 also describes a process for the electrostatic cleaning of exhaust gases containing dust and pollutants, in which the exhaust gas laden with dust and pollutants is first fed to dry electrostatic cleaning and then to wet electrostatic cleaning.
  • the precipitation electrodes are wetted with a treatment liquid in the wet electrostatic cleaning stage.
  • the gas velocity in the electrostatic separator is chosen so high that the fine grain fraction is separated in the dry electrostatic cleaning stage, the coarse grain fraction in the wet electrostatic cleaning stage.
  • a sludge accumulates in the sump of the wet electrostatic cleaning stage, which in addition to the dust also contains a relatively large amount of pollutants.
  • this method has the disadvantage that the exhaust gas is passed through the electrostatic precipitator at a relatively high gas velocity in order to cause the coarse grain fraction of the dust contained in the exhaust gas to be separated in the wet electrostatic cleaning stage.
  • This has the consequence that the residence time of the exhaust gas in the wet electrostatic cleaning stage is too short to the pollutants contained in the exhaust gas to such an extent remove that the limit values of TA-Luft from 27.02.1986 for the pollutants in the clean gas can be observed.
  • the invention is therefore based on the object to provide a method for the electrostatic cleaning of dust and pollutant-containing exhaust gases in multi-field separators, which the above. Avoids disadvantages and enables a separate separation of dry dust on the one hand and pollutants on the other hand, the pollutants contained in the exhaust gas in the wet electrostatic cleaning stage to be separated as largely as possible dust-free.
  • the object on which the invention is based is achieved in that the liquid added in the second stage at the upper ends of the precipitation electrodes is collected directly under the lower ends of the precipitation electrodes and discharged laterally from the separator, and in that the residue which still arises in the second stage is essentially dry dust is fed to a dust collector.
  • Dust means the solid particles contained in the exhaust gas; For example, in sintering plants, the dust consists mainly of iron oxide-containing solid particles, and in combustion plants, it consists of the small fly ash particles.
  • the term "pollutants" includes the acidic components contained in the exhaust gas such as HF, SO2, SO3 and HCl and the non-ferrous metals such as Pb, Cd present in the exhaust gas in gaseous or sublimed form. Hg and As.
  • At least one electric field is arranged in the first stage and in the second stage of the multi-field separator used. With an exhaust gas volume of 100,000 m3 / h, the field strength is 1.5 to 2.5 kV / cm and the total precipitation area of the multi-field separator is in the range of 400 to 700 m2.
  • Metal plates, metal nets, plastic mesh or plates made of ceramic can be used as plate-shaped precipitation electrodes Materials are used.
  • the liquid applied to the upper ends of the precipitation electrodes in the second stage is an aqueous solution.
  • Various types of devices such as dust bunkers, dust collecting channels and discharge elements such as screw conveyors can be used as the dust collecting device.
  • the dust still entering the second stage can also be separated dry to a large extent and thus separated from the pollutants. This is achieved in that only the precipitation electrodes are wetted and that the liquid used for sprinkling is drained off immediately below the precipitation electrodes in collecting channels, while the actual gas lane space and the space below the electrodes remain dry. Therefore, only a very small part of the dust gets into the liquid.
  • the method has the advantage that the pollutants contained in the exhaust gas are not mixed in the second stage with the substantially dry dust still accumulating in the second stage and are discharged from the separator. In the second stage, there is no sludge loaded with pollutants, the disposal of which is problematic. Furthermore, this method enables the dust resistance to be reduced to such an extent that the phenomenon of back spraying is avoided and dust and pollutants are separated in such a way that the limit values for pollutant concentrations in the clean gas are relatively far below.
  • the residence time of the gases in the first stage is 60 to 80% of the total residence time in a multi-field separator.
  • This measure has the effect that the gas temperature in the second stage is only approximately the Reduces the temperature difference by which the gas temperature increases again due to the gas compression by the downstream fan.
  • the water dew point is raised by only approx. 4 ° C.
  • the distance between the gas temperature and the water dew point in the second stage of the multi-field separator is chosen so large that the water dew point is not fallen below and thus the acidic pollutants do not condense on the non-wetted dry parts of the second stage . Special measures to avoid corrosion in the second stage are therefore not necessary.
  • the inventive division of the residence time enables the coarse grain fraction of the dust to be separated in the first stage and the fine grain fraction of the dust to be separated in the second stage.
  • the process can thus be carried out successfully at low gas velocities, the residence time in the second stage being sufficient to remove the pollutants from the exhaust gas to a sufficient extent.
  • a further preferred embodiment of the invention consists in that an alkaline aqueous solution with a pH of 7 to 9 is used as the liquid.
  • an alkaline aqueous solution with a pH of 7 to 9 is used as the liquid.
  • NaOH and / or KOH and / or Ca (OH) 2 is added to the liquid.
  • These substances are readily soluble in water, so that a pH in the range from 7 to 9 can be set quickly and without problems in the aqueous solution.
  • the precipitation electrodes are pulsed with a Range of 20 to 400 ms applied.
  • the precipitation electrodes are pulsed with a Range of 20 to 400 ms applied.
  • only so many DC voltage pulses are switched through to the spray electrode by this measure that just enough charge carriers are generated for the separation of the dust present in the raw gas stream.
  • the thyristor is then blocked for a period of 20 to 400 ms, the filter voltage falling exponentially until the next DC voltage pulses are switched through.
  • the filter voltage is kept at an optimal lower limit in order to avoid an excessive drop in the filter voltage and thus the driving force for the migration of the charged dust particles to the precipitation electrode.
  • the dead space between the precipitation electrodes and the housing wall of the separator is flushed with hot gas in the second stage.
  • the hot gas reaches the dead space via nozzles. This prevents condensation of the water vapor contained in the exhaust gas on the walls caused by the temperature falling below the dew point and the associated corrosion of the components of the second stage.
  • part of the clean gas discharged from the second stage is used as the hot gas. This measure ensures that pollutants do not get into the second stage of the multi-field separator again by flushing the dead space.
  • the injected clean gas is largely free of pollutants, so that corrosion, especially on the walls of the housing of the multi-field separator, is almost completely avoided.
  • the spray system of the second stage and / or the housing wall of the second stage is tapped.
  • the spray system of the second stage is to be understood as all the spray electrodes of the wet electrostatic cleaning stage and their suspension devices. It has surprisingly been found that the majority of the dust cleaned by the knocking is not deposited on the precipitation electrodes wetted with liquid, but partly in agglomerated form in the dry gas alley space or directly on the housing wall of the second stage and thus falls down is fed directly to the dust collecting device.
  • the implementation of the method according to the invention is not limited to the use of a specific tapping device.
  • Another embodiment of the invention is that the spray system is tapped once in 2 to 20 minutes.
  • the term "minutes" means the minutes when the second stage is switched on. If the spray system is tapped once in 2 to 20 minutes, the spray system is thoroughly cleaned without the actual process of electrostatic cleaning being adversely affected in the second stage.
  • the individual spray electrodes or the individual suspension devices of the spray system of a gas lane are tapped one after the other. This has the advantage that strong whirling up of dust and briefly increased dust concentrations in the clean gas are reliably avoided.
  • the housing wall of the second stage is tapped once in 20 to 120 minutes.
  • the term "minutes" means the switch-on minutes in the operation of the second stage. This measure thoroughly removes the dust from the housing during operation without adversely affecting the process of electrostatic cleaning in the second stage.
  • the object on which the invention is based is further achieved by the provision of a device in which the precipitation area of the precipitation electrodes of the second stage is 20 to 45% of the total precipitation area of the separator.
  • overflow troughs are arranged at the upper ends of the precipitation electrodes of the second stage and collecting troughs are arranged at the lower ends of the precipitation electrodes of the second stage, the precipitation electrodes of the second stage being fastened to the lower end of the respective overflow troughs.
  • the collecting troughs are dimensioned so that they can accommodate the amount of liquid, the throughput of which is usually 40 to 80 m3 / h with an exhaust gas amount of 100,000 m3 / h.
  • the overflow channels are dimensioned so that the precipitation electrodes are evenly covered with a Liquid film can be wetted. If the precipitation electrodes of the second stage are attached to the lower end of the respective overflow channels, a uniform wetting of the precipitation electrodes is achieved starting from the upper end of the precipitation electrodes.
  • At least one edge of the individual overflow channels is comb-shaped. This measure ensures that the precipitation electrodes are uniformly wetted with a liquid film and that the thickness of the liquid film is approximately constant over the precipitation surface of the respective precipitation electrode. This enables a uniform separation of the pollutants in the second stage, whereby almost the entire precipitation electrode surface is available for the separation of the pollutants and oversizing of the individual precipitation electrode surfaces is not necessary.
  • a liquid distributor pipe connected to the liquid supply and provided with openings is arranged in each overflow channel. According to this arrangement, the liquid can be fed to the individual overflow channels directly from above. With this arrangement it is also possible to circulate the liquid.
  • each overflow channel is connected to the respective liquid distributor pipe. This measure ensures that each precipitation electrode is connected directly to the respective liquid distribution pipe via the respective overflow channel, which allows quick access to the precipitation electrode during repair work.
  • a tube is arranged at the upper end of each precipitation electrode of the second stage, which is connected directly to the precipitation electrode, which has holes on the side facing away from the precipitation electrode in the plane of the precipitation electrode and which is connected to the liquid supply, wherein collecting troughs are arranged at the lower ends of the precipitation electrodes of the second stage.
  • the tube can be connected to the precipitation electrode, for example, by welding, gluing or by a screw or rivet connection. It has surprisingly been found that there is no crystal formation when the liquid emerges from the bores, so that a uniform irrigation of the precipitation electrodes is ensured over a long operating time.
  • the thickness of the liquid film can also be optimized by changing the amount of liquid supplied. It can also be advantageous to change the throughput of the liquid in a fixed cycle during the continuous supply of the liquid.
  • the diameter of the bores is 8 to 12 mm. This measure results in a particularly uniform distribution of the liquid on the respective precipitation electrode.
  • the hole spacing of the bores is 20 to 40 mm. If the hole spacing of the bores is 20 to 40 mm, the thickness of the liquid film on the precipitation electrode can be set particularly advantageously, since a liquid film with a constant thickness is already formed on the outer surface of the tube.
  • the diameter of the tube is 60 to 140 mm. This has the advantage that when such a tube is used, the usual throughputs for the liquid, which are between 40 and 80 m3 / h with an exhaust gas quantity of 100,000 m3 / h, can be applied to the precipitation electrodes without problems. If the tube has a diameter of 60 to 140 mm, it can be used in many ways, so that the costs for the device according to the invention are reduced by series production of the tube.
  • the tube is additionally connected to the precipitation electrode via at least one plate arranged in the longitudinal direction of the tube.
  • this measure ensures that the liquid film between the bores of the tube and the precipitation electrode does not tear off, on the other hand the connection between the tube and the precipitation electrode is strengthened.
  • Each plate can be connected to the tube and the precipitation electrode, for example by welding, gluing or by a screw or rivet connection.
  • At least one plate is connected tangentially to the tube. This measure ensures a continuous transition of the liquid film between the tube and the plate.
  • a hot gas supply is arranged in the second stage.
  • the arrangement of a hot gas supply in the second stage enables the dead space between the precipitation electrodes and the housing wall of the separator to be flushed with hot gas in the second stage.
  • Another embodiment of the invention is that the edges of each precipitation electrode of the second stage are connected to a pipeline which is connected to the liquid supply. This has the advantage that the liquid can be fed directly to the individual precipitation electrodes, the individual gas lanes between the precipitation electrodes being kept free for gas passage, so that the separation process in the second stage of the multi-field separator is not hindered.
  • the pipeline is provided with openings on the lower edge of each precipitation electrode of the second stage.
  • the exhaust gas loaded with dust and pollutants enters the first stage (1), in which dry electrostatic cleaning takes place, in the direction of the arrow.
  • the first stage (1) there are dry working precipitation electrodes (3a) and spray electrodes (4) which are held in a suspension device (18) and are electrically insulated with support insulators (19).
  • the dry working precipitation electrodes (3a) of the first stage (1) are cleaned by periodic tapping during operation.
  • a dust collecting device (5a) and a discharge device (6a) are provided in the first stage (1) to discharge the dry dust.
  • the exhaust gas enters the second stage (2) immediately after the dry electrostatic cleaning.
  • the second stage (2) there are precipitation electrodes (3b) and spray electrodes (4) wetted with liquid.
  • the precipitation electrodes (3b) and spray electrodes (4) are electrically insulated with post insulators (19).
  • the liquid loaded with pollutants runs down the respective precipitation electrode surfaces and reaches the respective collecting troughs (8).
  • a dust collecting device (5b) and a discharge device (6b) are provided for separating the dust which is dry in the second stage.
  • a hot gas supply (11) is arranged in the second stage (2) of the multi-field separator. The hot gas (21) passes through the nozzles of the hot gas supply (11) into the dead spaces between the precipitation electrodes (3b) and the housing wall [9) of the separator. The clean gas leaves the second stage (2) of the multi-field separator in the direction of the arrow.
  • the dust collecting device (5b) is designed according to FIG. 2 as a discharge screw, which feeds the dry dust accumulating in the second stage (2) to a discharge member (6b).
  • the liquid, which is collected by the collecting troughs (8) and is loaded with pollutants, is discharged laterally via an outlet (20). Via the outlet (20), the loaded liquid, in which dissolved salts are present, can be fed to a downstream crystallization system, in which the dissolved salts are obtained as solids.
  • FIG 3 shows a wetted precipitation electrode (3b) with a liquid supply (13) and the collecting trough (8).
  • the liquid passes from the liquid supply (13) via the pipeline (12) to the overflow channel (7) and from there via the surface of the precipitation electrode (3b) into the collecting channel (8).
  • the loaded liquid is discharged via the outlet (20).
  • FIG. 4 shows a perspective section of some gas lanes between the precipitation electrodes (3b) with hot gas supply (11), overflow channels (7) and collecting channels (8).
  • the liquid is fed through the pipeline (12) to the respective overflow channel (7) and reaches the precipitation electrode (3b) via the edges (10) of the overflow channel (7).
  • the hot gas (21) is injected through the hot gas feed (11) into the dead space between the precipitation electrode (3b) and the housing wall (9) of the separator.
  • a precipitation electrode (3b) with overflow channel (7) and collecting channel (8) is shown, in which the liquid is supplied to the overflow channel (7) from above.
  • the liquid passes into a liquid distributor pipe (15) which is provided with openings (16) and which is connected to the liquid feed (13) Overflow channel (7).
  • the precipitation electrode (3b) is weighted down by a weight (17). This enables them to be fixed centrally in the collecting trough (8).
  • a valve (23) is arranged outside the housing wall (9) of the separator in the liquid feed (13) with which the amount of liquid can be metered exactly.
  • the liquid feed (13) and the liquid distributor pipe (15) are connected to the overflow channel (7) by webs (22).
  • the precipitation electrode (3b) can thus be held on the liquid distributor pipe (15) and the liquid feed (13) via the overflow channel (7).
  • FIG. 9 shows a collecting trough (8) with a part of the pipeline (12) on the lower edge of a precipitation electrode (3b). Part of the liquid supplied passes through the openings (14) directly into the collecting channel (8) and rinses it out. The unloaded liquid is discharged from the collecting channel (8) together with the loaded liquid.
  • spray electrodes (4) of the second stage (2) are shown schematically together with a tapping device.
  • Metal wires, metal strips or plastic fibers coated with electrically conductive substances can be used as spray electrodes, for example.
  • Each spray electrode (4) is clamped vertically in a frame (4a) belonging to the suspension device (18), on which an anvil (4b) is arranged.
  • the monkey (23) is firmly connected to a rotatably mounted shaft (24).
  • a lifting lever (25) is attached to the shaft (24) and is pivoted (26) is connected to a pull rod (27).
  • the pull rod (27) is arranged to be vertically displaceable by the bearing (28). If the pull rod (27) is now moved in the direction of the arrow, the monkey (23) strikes the anvil (4b).
  • FIG. 11 the housing wall (9) of the second stage (2) is shown together with a knocking device.
  • the knocking device corresponds to that knocking device which is shown in FIG. If the pull rod (27) is moved in the direction of the arrow, the drop hammer (23) strikes the anvil (9a), which is arranged directly on the housing wall (9).
  • FIG. 12 shows the top view of the knocking device shown in FIG. 11.
  • the shaft (24) is shown enlarged in FIG.
  • the drop hammer (23) is welded to the shaft (24).
  • the lifting lever (25) is also welded to the shaft (24).
  • the head device shown in FIGS. 10 to 12 is only given as an example. Other knocking devices can also be used.
  • the tube (29) which is connected to the precipitation electrode (3b).
  • the tube (29) On its side facing away from the precipitation electrode (3b), the tube (29) has holes (30) in the plane (32) of the precipitation electrode (3b) through which the liquid exits from the inside of the tube to the outside.
  • the tube (29) is additionally connected to the precipitation electrode (3b) via the plates (31a) and (31b).
  • the plates (31a) and (31b) are connected tangentially over the entire length of the tube (29) to the tube (29) at the points (X) and (X ').
  • the liquid escaping through the bores (30) runs on the outer wall of the tube (29) to the plates (31a) and (31b), whereby a Forms liquid film with a constant thickness.
  • the liquid reaches the surface of the precipitation electrode (3b) directly via the plates (31a) and (31b) and flows downwards.
  • the amount of exhaust gas from a sintered belt is 400,000 Nm3 / h, the exhaust gas having a temperature of 120 ° C, a dew point of 40 ° C and a dust content of 1 g / Nm3.
  • the duration of the treatment time in the first stage (1) of the multi-field separator is 6.2 s
  • the treatment time in the second stage (2) of the multi-field separator is 1.8 s
  • the precipitation area of the precipitation electrodes (3b) of the second stage (2) is 23% of the total precipitation area of the separator.
  • the throughput for the liquid for wetting the precipitation electrodes (3b) is 300 m3 / h.
  • a residual dusty content after treatment in the range of the first stage (1) was 135 mg / Nm3 and in the second stage (2) of 21 mg / Nm3 measured.
  • the emission values for dusty inorganic substances were below the second stage (2) for class I (Cd, Hg, etc.) below 0.2 mg / Nm3, for class II (As, Ni, etc.) below 1.0 mg / Nm3 and for class III (Pb, F, Sn, etc.) below 5.0 mg / Nm3 (classification of the dust-like inorganic substances according to TA-Luft from 27.02.1986).
  • the limit values for vaporous or gaseous inorganic substances - especially for SO2 with 500 mg / Nm3 - were not exceeded in the test.
  • the temperature drop in the area of the wetted precipitation electrodes (3b) was approx. 25 ° C, causing the gas temperature to drop to 95 ° C and the dew point to be raised to 44 ° C.
  • the downstream fan increased the gas temperature by 24 ° C, which raised it to 119 ° C again.
  • the gas therefore had one Gas inlet temperature at the chimney base of 119 ° C.
  • the relatively slight cooling of the exhaust gas which was brought about in accordance with the invention in the second stage (2), achieved energy savings of approximately 120 kW for the 3 MW blower used at a gas inlet temperature of 95 ° C. and a dew point of 44 ° C. .

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Electrostatic Separation (AREA)
  • Treating Waste Gases (AREA)
EP90202257A 1989-08-31 1990-08-22 Procédé et appareil pour la purification électrostatique d'effluents de gaz nocifs et poussiéreux dans des séparateurs à plusieurs champs Expired - Lifetime EP0415486B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90202257T ATE102852T1 (de) 1989-08-31 1990-08-22 Verfahren und vorrichtung zur elektrostatischen reinigung staub- und schadstoffhaltiger abgase in mehrfeldrigen abscheidern.

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
DE3928808 1989-08-31
DE3928808A DE3928808C1 (en) 1989-08-31 1989-08-31 Treating chemical pollutants - by passage of waste gas through multiple passages between collector plates
DE19904004357 DE4004357C1 (en) 1989-08-31 1990-02-13 Gas electrostatic cleaning system - has linkage driven hammer operating against striker at bottom edge of screen
DE4004357 1990-02-13
DE4023723 1990-07-26
DE19904023723 DE4023723C1 (fr) 1989-08-31 1990-07-26

Publications (2)

Publication Number Publication Date
EP0415486A1 true EP0415486A1 (fr) 1991-03-06
EP0415486B1 EP0415486B1 (fr) 1994-03-16

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Application Number Title Priority Date Filing Date
EP90202257A Expired - Lifetime EP0415486B1 (fr) 1989-08-31 1990-08-22 Procédé et appareil pour la purification électrostatique d'effluents de gaz nocifs et poussiéreux dans des séparateurs à plusieurs champs

Country Status (6)

Country Link
US (1) US5137546A (fr)
EP (1) EP0415486B1 (fr)
JP (1) JPH03165848A (fr)
KR (1) KR910004255A (fr)
AU (1) AU624527B2 (fr)
DE (1) DE59004994D1 (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
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WO2007140882A1 (fr) * 2006-06-07 2007-12-13 Alstom Technology Ltd Précipitateur électrostatique humide
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CN106955789A (zh) * 2017-05-25 2017-07-18 安徽意义环保设备有限公司 一种组合式自动清灰的电除尘器
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WO2007140882A1 (fr) * 2006-06-07 2007-12-13 Alstom Technology Ltd Précipitateur électrostatique humide
US8088198B2 (en) 2006-06-07 2012-01-03 Alstom Technology Ltd Wet electrostatic precipitator
WO2011054878A1 (fr) * 2009-11-05 2011-05-12 Omega Thermo Products Llc Panneau et utilisation d'un tel panneau dans un dispositif pour nettoyer des gaz par extraction d'impuretés à partir de ceux-ci
US8303686B2 (en) 2009-11-05 2012-11-06 Omega Thermo Products Llc Panel and use of such a panel in a device for cleaning gases by removing impurities therefrom
CN103551250A (zh) * 2013-11-05 2014-02-05 福建龙净环保股份有限公司 一种电除尘器及其振打方法
CN105396694A (zh) * 2015-12-31 2016-03-16 哈尔滨众维豪环保科技有限公司 一种干湿式一体电除尘装置
CN106179742A (zh) * 2016-08-30 2016-12-07 艾尼科环保技术(安徽)有限公司 一种带蒸发冷却段的干湿复合型静电除尘器
CN106975569A (zh) * 2017-02-23 2017-07-25 合肥三邦环保科技有限公司 一种静电式油烟净化装置
CN106975569B (zh) * 2017-02-23 2018-07-17 合肥三邦环保科技有限公司 一种静电式油烟净化装置
CN106955789A (zh) * 2017-05-25 2017-07-18 安徽意义环保设备有限公司 一种组合式自动清灰的电除尘器
CN106975571A (zh) * 2017-05-25 2017-07-25 安徽意义环保设备有限公司 一种可以自动清灰的电除尘器
CN106975572A (zh) * 2017-05-25 2017-07-25 安徽意义环保设备有限公司 一种电除尘器阴极吊挂系统

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US5137546A (en) 1992-08-11
AU624527B2 (en) 1992-06-11
DE59004994D1 (de) 1994-04-21
AU6200690A (en) 1991-03-07
EP0415486B1 (fr) 1994-03-16
KR910004255A (ko) 1991-03-28

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