EP0461695A1 - Procédé et appareil pour la purification d'effluents de gaz poussiéreux et nocifs - Google Patents

Procédé et appareil pour la purification d'effluents de gaz poussiéreux et nocifs Download PDF

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Publication number
EP0461695A1
EP0461695A1 EP91201274A EP91201274A EP0461695A1 EP 0461695 A1 EP0461695 A1 EP 0461695A1 EP 91201274 A EP91201274 A EP 91201274A EP 91201274 A EP91201274 A EP 91201274A EP 0461695 A1 EP0461695 A1 EP 0461695A1
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EP
European Patent Office
Prior art keywords
stage
liquid
precipitation
electrodes
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.)
Granted
Application number
EP91201274A
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German (de)
English (en)
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EP0461695B1 (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 DE4018488A external-priority patent/DE4018488C1/de
Priority claimed from DE19904023723 external-priority patent/DE4023723C1/de
Application filed by Metallgesellschaft AG filed Critical Metallgesellschaft AG
Publication of EP0461695A1 publication Critical patent/EP0461695A1/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
    • B03C3/34—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
    • B03C3/34—Constructional details or accessories or operation thereof
    • B03C3/40—Electrode constructions
    • 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
    • B03C3/01—Pretreatment of the gases prior to electrostatic precipitation
    • B03C3/011—Prefiltering; Flow controlling
    • 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, 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 method for cleaning dust and pollutant-containing exhaust gases, in which the exhaust gases are first subjected to dry cleaning in a mass separator and then to electrostatic cleaning in an electrostatic filter in a second stage, and to a device for carrying them out of the procedure.
  • DE-OS 2907081 describes a device for dry removal of dust from exhaust gas, consisting of a centrifugal separator with numerous dedusting cells and a downstream, horizontally flowed, dry electrostatic filter.
  • the teaching described in DE-OS 2907081 is based on the task of designing the centrifugal separator in a simple and compact manner, so that it can be arranged directly in front of the electrostatic filter without difficulty.
  • the device described in DE-OS 2907081 has the disadvantage that the exhaust gases which are passed through the device can only be freed of dust and other pollutants contained in the exhaust gas remain in the exhaust gas.
  • the invention is therefore based on the object of providing a method for cleaning exhaust gases containing dust and pollutants, in which the exhaust gases are first subjected to dry cleaning in a mass separator in a first stage and then to electrostatic cleaning in an electrostatic filter in a second stage, and in which dust and pollutants are separated from the Exhaust gas is reached.
  • the invention is also based on the object of providing an apparatus for carrying out the method.
  • the object on which the invention is based is achieved in that the exhaust gases are passed in the second stage through one or more fields with liquid-wetted, gas-forming precipitation electrodes.
  • “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, Hg and As present in the exhaust gas in gaseous or sublimed form. Centrifugal separators, such as cyclones or multicyclones, can be used as mass separators.
  • Metal plates, metal nets, plastic mesh or plates made of ceramic materials can be used as precipitation electrodes.
  • the liquid applied to the precipitation electrodes in the second stage is an aqueous solution.
  • the field strength is, for example, 1.5 to 5 kV / cm, and the precipitation area of the precipitation electrodes is in the range of 200 to 800 m2. It has surprisingly been found that the process according to the invention separates dust and pollutants in such a way that the limit values according to TA Lucas of 27.2.1986 for dust and pollutant concentrations in the clean gas are undershot.
  • a preferred embodiment of the invention consists in that the liquid is applied in the second stage at the upper ends of the precipitation electrodes and collected directly under the lower ends of the precipitation electrodes and discharged laterally from the separator and that the substantially dry dust still accumulating in the second stage is fed to a dust collecting device.
  • a dust collecting device 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. While the vast majority of the dust is separated in a dry form in the first stage, the dust that still enters the second stage can also be largely separated in a dry form and thus separated from the pollutants. It is advantageous that in the second stage there is no sludge which contains a relatively large amount of pollutants in addition to the dust and which would have to be treated. 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
  • German patent application P 39 28 808 describes a process for the electrostatic cleaning of exhaust gases containing dust and pollutants in multi-field electrostatic precipitators, in which the exhaust gases are fed to dry electrostatic cleaning in a first stage and then in a second electrostatic stage in which liquid is wetted Precipitation electrodes are arranged, are freed from the pollutants.
  • the liquid applied is collected directly under the lower ends of the precipitation electrodes and laterally discharged from the separator and the essentially dry dust still present in the second stage is fed to a dust collection device, it has surprisingly been found that also A separate separation of dry dust on the one hand and pollutants on the other hand is possible if the first stage is not a dry electrostatic precipitator but a mass separator is executed. In the second stage of the process according to the invention, therefore, there is also no sludge loaded with pollutants, the disposal of which is problematic.
  • the residence time of the exhaust gases in the second stage is 2 to 6 seconds.
  • This measure has the effect that the gas temperature in the second stage only drops by approximately the temperature by which the gas temperature is reduced by the downstream Fan increased again due to gas compression.
  • the water dew point is raised by only 4 ° C.
  • the distance between the gas temperature and the water dew point in the second stage 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 residence time of the exhaust gases in the second stage is 2 to 6 seconds, the coarse grain fraction of the dust is separated in the first step and the fine grain fraction of the dust is separated in the second step.
  • the process can thus be carried out successfully at low gas speeds, the residence time in the second stage being sufficient to also 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 the pH in the range from 7 to 9 can be adjusted quickly and easily in the aqueous solution.
  • the spray system of the second stage and / or the housing wall of the second stage is tapped. It has surprisingly been shown 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 walls of the second stage and thus falls down is fed directly to the dust collecting device.
  • the tapping is not limited to the use of a specific tapping device.
  • the spray system is tapped once in 2 to 20 minutes.
  • minutes means the switch-on minutes in the operation of the second stage. 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 swirling of dust and briefly increased dust concentrations in the clean gas are avoided.
  • Another preferred embodiment of the invention is that the housing wall of the second stage in 20 to 120 Minutes is knocked once.
  • the term "minutes" means the switch-on minutes in the operation of the second stage. This measure thoroughly removes dust from the housing wall during operation without adversely affecting the process of electrostatic cleaning in the second stage.
  • the dead space between the precipitation electrodes and the housing wall 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 reach the second stage again by flushing the dead space.
  • the injected clean gas is largely freed of pollutants, so that corrosion, especially on the housing walls of the multi-field separator, is almost completely avoided.
  • the object on which the invention is based is further achieved by the provision of a device for carrying out the method, which consists of a mass separator arranged as a first stage and an electrostatic filter arranged as a second stage, liquid-wetted, gas-forming precipitation electrodes being arranged in the electrostatic filter. Dust and pollutants can be largely removed from the exhaust gas with the device at low gas speeds, so that the prescribed limit values for dust and pollutant concentrations are undershot.
  • overflow channels are arranged at the upper ends of the precipitation electrodes and collecting channels at the lower ends, the precipitation electrodes being attached to the lower end of the respective overflow channels.
  • this design ensures that the precipitation electrodes are sprinkled evenly, on the other hand it is ensured that the liquid loaded with the pollutants is collected relatively free of dust directly below the lower ends of the precipitation electrodes and then discharged.
  • the collecting troughs are dimensioned so that they can hold 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 wetted with a liquid film. 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 - starting from their upper end - is achieved.
  • 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 reliably avoided.
  • 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 change the flow rate 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 has the effect, on the one hand, that the liquid film between the bores of the tube and the precipitation electrode does not tear off, on the other hand, strengthened the connection between the tube and the precipitation electrode.
  • 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.
  • FIG. 1 shows a longitudinal section of the mass separator arranged as the first stage (1) and of the electrostatic filter arranged as the second stage (2).
  • the exhaust gas loaded with dust and pollutants enters the first stage (1), in which dry cleaning takes place in a mass separator, horizontally in the direction of the arrow.
  • a multicyclone is shown as a mass separator.
  • the dry dust separated from the exhaust gas in the first stage (1) is collected in the lower, funnel-shaped part of the mass separator and discharged via a lock (1 '').
  • the exhaust gas enters the second stage (2) immediately after the dry cleaning via the lock (1 ').
  • In the second stage (2) there are liquid-wetted precipitation electrodes (3) and spray electrodes (4) which 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 (5) and a discharge device (6) are provided for separating the dust which is dry in the second stage (2).
  • a hot gas supply (11) is arranged in the second stage (2). The hot gas (21) passes through the nozzles of the hot gas supply (11) into the dead spaces between the precipitation electrodes (3) and the housing wall (9) of the second stage (2). The clean gas leaves the second stage (2) horizontally in the direction of the arrow.
  • the dust collecting device (5) is designed according to FIG. 2 as a discharge screw, which conveys the dry dust accumulating in the second stage (2) to a discharge member (6) feeds.
  • 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.
  • a wetted precipitation electrode (3) with a liquid supply (13) and the collecting channel (8) is shown.
  • 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 electrodes (3) 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 (3) 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 (3) via the edges (10) of the overflow channel (7).
  • the hot gas (21) is injected through the hot gas supply (11) into the dead space between the precipitation electrode (3) and the housing wall (9) of the separator.
  • a precipitation electrode (3) 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 reaches the overflow channel (7) via a liquid distributor pipe (15) which is provided with openings (16) and is connected to the liquid supply (13).
  • the precipitation electrode (3) is through a weight (17) weighed down. 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 (3) 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 (3). 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 (4).
  • 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.
  • FIG. 13 shows a tube (29) which is connected to the precipitation electrode (3).
  • the tube (29) On its side facing away from the precipitation electrode (3), the tube (29) has bores (30) in the plane (32) of the precipitation electrode (3) through which the liquid exits from the inside of the tube to the outside.
  • the tube (29) is additionally connected to the precipitation electrode (3) via the plates (31a) and (31b).
  • the plates (31a) and (31b) are connected at points (X) and (X ') tangentially over the entire length of the tube (29) to the tube (29).
  • the liquid escaping through the bores (30) runs on the outer wall of the tube (29) the plates (31a) and (31b), whereby a liquid film with a constant thickness is formed.
  • the liquid reaches the surface of the precipitation electrode (3) via the plates (31a) and (31b) and flows downwards.
  • FIG. 14 shows the section B-B through the tube (29) in the plane (32) of the precipitation electrode (3) according to FIG. 1.
  • the liquid is discharged to the outside in the direction of the arrow and forms a liquid film of almost constant thickness on the outer surface of the tube (29).
  • the amount of exhaust gas from a sintered belt is 400,000 Nm3 / h, whereby the exhaust gas has a temperature of 120 ° C, a dew point of 40 ° C and a dust content of 1.5 g / Nm3.
  • the exhaust gas is passed horizontally into a multi-cyclone arranged as the first stage (1).
  • the gas quantities are divided into many cyclones of small diameter, but arranged in parallel in a common housing, but with high centrifugal force.
  • the multicyclone used has the following fraction separation levels with regard to the grain size: Grain size in ⁇ m Fractional separation degrees in% 0-2 0 2 - 5 50 5 - 10 80 10-15 93 15-20 95 20-30 97 > 30 99
  • the overall separation efficiency of the multicyclone is 91.5%.
  • the exhaust gas with a dust content of 0.128 g / Nm3 thus enters the electrostatic filter arranged as the second stage (2).
  • the precipitation area of the liquid-coated precipitation electrodes (3) of the second stage (2) is 1500 m2.
  • the throughput for the liquid for wetting the precipitation electrodes (3) is 300 m3 / h.
  • a residual dusty substance content after treatment is measured in the electrostatic filter arranged as second stage (2) of 18 mg / Nm3.
  • the emission values for dusty inorganic substances are below the second stage (2) for class I (Cd, Hg, etc.) below 0.2 mg / Nm3, for class II (from As, Ni etc.) 1.0 mg / Nm3 and for class III (Pb, F, Sn etc.) below 5.0 mg / Nm3 (classification of the dusty inorganic substances according to TA-Luft from 27.2.1986).
  • 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 (3) is 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 increases the gas temperature by 24 ° C, which in turn raises it to 119 ° C.
  • the gas therefore has a gas inlet temperature at the chimney base of 119 ° C.
  • the relatively slight cooling of the exhaust gas which is brought about according to the invention in the second stage (2), achieves an energy saving 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. .
EP91201274A 1990-06-09 1991-05-29 Procédé et appareil pour la purification d'effluents de gaz poussiéreux et nocifs Expired - Lifetime EP0461695B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE4018488A DE4018488C1 (en) 1990-06-09 1990-06-09 Removing dust and hazardous materials from waste gases - by sepg. dust in dry multi-cyclone stage, and wet electrostatic precipitator stage
DE4018488 1990-06-09
DE4023723 1990-07-26
DE19904023723 DE4023723C1 (fr) 1989-08-31 1990-07-26

Publications (2)

Publication Number Publication Date
EP0461695A1 true EP0461695A1 (fr) 1991-12-18
EP0461695B1 EP0461695B1 (fr) 1995-02-15

Family

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Family Applications (1)

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EP91201274A Expired - Lifetime EP0461695B1 (fr) 1990-06-09 1991-05-29 Procédé et appareil pour la purification d'effluents de gaz poussiéreux et nocifs

Country Status (7)

Country Link
US (1) US5160510A (fr)
EP (1) EP0461695B1 (fr)
JP (1) JPH04227075A (fr)
KR (1) KR920000359A (fr)
AT (1) ATE118371T1 (fr)
AU (1) AU643794B2 (fr)
DE (1) DE59104573D1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
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DE102008046410A1 (de) * 2008-09-04 2010-03-11 Eisenmann Anlagenbau Gmbh & Co. Kg Vorrichtung zum Abscheiden von Lack-Overspray
DE102008046414A1 (de) * 2008-09-04 2010-03-18 Eisenmann Anlagenbau Gmbh & Co. Kg Vorrichtung zum Abscheiden von Lack-Overspray
DE102009006528A1 (de) * 2009-01-28 2010-07-29 Eisenmann Anlagenbau Gmbh & Co. Kg Anlage zum Beschichten, insbesondere Lackieren, von Gegenständen, insbesondere Fahrzeugkarosserien
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DE102008046410A1 (de) * 2008-09-04 2010-03-11 Eisenmann Anlagenbau Gmbh & Co. Kg Vorrichtung zum Abscheiden von Lack-Overspray
DE102008046414A1 (de) * 2008-09-04 2010-03-18 Eisenmann Anlagenbau Gmbh & Co. Kg Vorrichtung zum Abscheiden von Lack-Overspray
US8945288B2 (en) 2008-09-04 2015-02-03 Eisenmann Ag Device for separating paint overspray
DE102008046410B4 (de) * 2008-09-04 2016-03-17 Eisenmann Se Vorrichtung zum Abscheiden von Lack-Overspray
DE102009006528A1 (de) * 2009-01-28 2010-07-29 Eisenmann Anlagenbau Gmbh & Co. Kg Anlage zum Beschichten, insbesondere Lackieren, von Gegenständen, insbesondere Fahrzeugkarosserien
WO2010086093A1 (fr) * 2009-01-28 2010-08-05 Eisenmann Anlagenbau Gmbh & Co. Kg Installation de revêtement, notamment de peinture, d'objets, notamment de carrosseries de véhicule
DE102011012011A1 (de) * 2011-02-22 2012-08-23 Eisenmann Ag Vorrichtung zum Abscheiden von Overspray

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ATE118371T1 (de) 1995-03-15
DE59104573D1 (de) 1995-03-23
EP0461695B1 (fr) 1995-02-15
KR920000359A (ko) 1992-01-29
AU7823291A (en) 1991-12-12
JPH04227075A (ja) 1992-08-17
US5160510A (en) 1992-11-03

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