DE102019105776A1 - Electrostatic separator for cleaning flue gases - Google Patents

Abstract

An electrostatic separator for the cleaning of flue gases, comprising a housing (1) with a removable collecting container (8) for separated particles, a gas inlet (2) and a gas outlet (3) and a flow channel arranged in between in the housing (1) and leading past the collecting container the gas inlet (2) downstream, downwardly directed first flow channel section (5) of the flow channel, a flow deflector (6) following the first flow channel section (5) into an upwardly directed second flow channel section (7) of the flow channel, the second flow channel section (7) opens into the gas outlet (3) and a corona discharge arrangement in the flow channel, comprising at least one disc-shaped corona discharge electrode (9, 10) and separation surfaces (11), suitable for the formation of a circumferential electric field (12) between the corona discharge electrode (9, 10) and the separation surfaces (11). Based on this, the task is to improve the suitability and safer handling of flue gas cleaning, especially for small heating systems. The object is achieved in that the separation surfaces (11) are earthed and are entirely or partially formed by the inner walls of the collecting container (8).

Description

The invention relates to an electrostatic separator for cleaning flue gases, preferably from technical conversion processes, preferably combustion processes such as e.g. from small combustion systems, ovens, combustion engines or other incineration systems.

Flue gases are particulate gases with solid and / or liquid components. They have a gaseous carrier component in which solid particles and / or liquid drops are suspended.

It is still common practice to burn solid fuels such as wood or coal for heating without any flue gas cleaning. The resulting flue gases cause fine dust and aerosol emissions and thus, on the one hand, pollution of the environment and, on the other hand, emissions-related health hazards. Fine dust particles and aerosols can be captured and processed by effective flue gas cleaning before they escape into the environment. An electrostatic precipitator is such an effective gas cleaning device.

A preferred use of the electrostatic separator is the cleaning of flue gases from small incineration plants such as incinerators for biomass, coke, coal, fuel oils, wood, wood pellets or other fossil fuels.

Electrostatic precipitators have a wide range of uses for cleaning aerosols. For example, in an in the CH 694 645 A5 electrostatic precipitators, which send particles of combustion gas through an ionizer, in which they are charged in a corona discharge which is generated at the sharp edges of a high-voltage electrode. The collector pipe of the separator is earthed. Charged particles are collected on the inner surface of the collector tube, mainly gas downstream of the ionizer.

Out DE 10 2004 039 118 it can be seen that particles can be charged and separated in a first ionization field. Charged particles are separated under the influence of an aerosol space charge on the inner surface of the walls of the separator chamber, through which the flue gases pass, and then exit the separator in a clean state.

Furthermore, from the DE 10 2008 049 211 A1 an electrostatic precipitator for cleaning flue gases from wood-burning stoves or stationary diesel engines. It consists of a housing with at least one gas inlet and one gas outlet. The gas inlet is followed in the direction of flow by a downwardly leading, tubular first flow channel section with a non-corona agglomerator, followed by a corona discharger, which opens into a covered shaft for collecting separated soot particles. The tubular second flow channel section follows from the covered shaft in the direction of flow, leading upwards, which opens into a gas outlet and is equipped as a collector with a rotatable, helical brush.

Based on this, one object of the invention is to design a concept for electrostatic separation for cleaning flue gases in such a way that it is particularly suitable for use with small combustion systems, especially in confined spaces or in environments that are sensitive to emissions, e.g. is suitable in buildings and is characterized by particularly safe handling.

The object is achieved by an electrostatic precipitator with the features of claim 1. Subclaims referring back to this reproduce advantageous embodiments.

The solution to the problem is based on an electrostatic separator for the cleaning of flue gases, comprising a housing with a preferably downwardly removable collecting container for separated particles, a gas inlet and a gas outlet and between a flow channel arranged in the housing and routed past the collecting container. After the gas inlet downstream, the flow channel initially follows a downwardly directed first flow channel section and from there opens into a flow deflector, from there into an upwardly directed second flow channel section of the flow channel and from which it exits into the gas outlet.

A corona discharge arrangement is arranged in the flow channel, comprising at least one, preferably two disc-shaped corona discharge electrodes and separation surfaces, suitable for the formation of a circumferential electrical field between the corona discharge electrode and the separation surfaces as counter-electrodes. In the case of several corona discharge electrodes, these are arranged in series in the flow channel in the direction of flow and are preferably electrically connected to one another.

The disk-shaped corona discharge electrodes are preferably arranged orthogonally to the direction of flow in the flow channel, thus deflecting the flue gas flow in the flow channel by the electric field is carried out evenly and homogeneously over the entire field. To generate a uniform electric field strength over the entire field, it is proposed that the shortest distance between the circumferential edge of the corona discharge electrode and the closest inner wall is the same. Correspondingly, the electric field between the circumferential edge of a corona discharge electrode and the shortest distance in each case to the inner wall is at a maximum.

A preferred embodiment of the at least one disk-shaped corona discharge electrode is characterized in that it has circumferentially radially protruding electrode tips, the distance between the electrode tips then being decisive as the shortest distance and preferably uniformly the same to the closest deposition surface.

The separation surfaces are formed by the inner wall areas of the flow channel. The separation surfaces in the flow channel are preferably grounded (zero potential), while the at least one corona discharge electrode is preferably connected to a preferably common high-voltage source and through this has a potential difference to the zero potential, preferably a negative direct voltage potential. The housing or at least the inner walls of the flow channel or at least the separation surfaces are electrically conductive or coated in a conductive manner.

The separation surfaces extend in their entirety basically over all electrically conductive or conductive coated inner walls of the flow channel, which are electrically connected to one another and are thereby subjected to the same potential to one another.

Basically, the entire inner surface of the electrostatic separator forms the collecting surface for particles: particles are separated from the gas flow after passing through the gas inlet and before reaching the corona discharge arrangement, initially due to gas-dynamic phenomena, as gas-dynamic and mechanical precipitation on the inner walls, especially of the first flow channel section. When the gas flow reaches the first corona discharge electrode, the deposition takes place increasingly electrostatically in the corona discharge field, the particles being deposited essentially as particle deposits on the grounded inner wall areas. This deposition is repeated in the case of the second and possibly further corona discharge electrodes following the first corona discharge electrode. Deposition also takes place on the surfaces of the corona discharge electrodes (gas dynamic effects, mechanical collecting and collecting under the influence of electrical wind). Particles are also deposited on the upward-facing surfaces of the first and second and, if applicable, subsequent disc-shaped corona discharge electrodes (gas-dynamic effects, mechanical precipitation, partially electrostatic separation of positively charged particles from the gas flow on the surface of the high-voltage electrode with negative polarity, electrical precipitation Wind). Particles are deposited on the inner surface of the collecting container, which is also earthed. This deposition takes place due to space charge effects by means of mechanical forces, thermophoretic forces, electrical field forces between the inner surface of the collecting container and the rigid support between the corona discharge electrodes. The inner walls of the second flow channel section following the corona discharge electrodes in the direction of flow also under the influence of space charge effects, a further separation of charged particles takes place.

An essential basic idea of the invention is to form the separation surfaces entirely or partially, preferably for the most part, by inner walls of the collecting container. This means that the flow channel is passed through the collecting container or is tangent to it at least in the area of the corona discharge arrangement. The separation surfaces or some of the separation surfaces extend onto the inner wall of the collecting container, which thus forms part of the aforementioned inner wall of the flow channel. For this purpose, the collecting container and thus the inner walls are electrically conductive or have a conductive coating and form the aforementioned inner wall of the flow channel. The collecting container and thus the inner walls are electrically conductive or coated for this purpose.

A preferred embodiment also provides for at least one of the, preferably all, disk-shaped corona discharge electrodes to be arranged in the collecting container, i. they are not arranged in the interior of the housing, but at least partially protrude from the housing and into the collecting container.

A preferred embodiment is characterized in that only the areas on the separation surfaces with the shortest distance from one of the electrodes are entirely or partially, preferably predominantly, formed by inner walls of the collecting container.

Another preferred embodiment is characterized in that only the areas on the separation surfaces with the shortest distance plus a maximum of 50%, more preferably 20%, more preferably 10% of the shortest distance to one of the electrodes, are entirely or partially, preferably predominantly formed by inner walls of the collecting container.

The at least one corona discharge electrode is preferably fixed in the flow channel by, preferably only by, a rigid high-voltage line and is connected via this to a high-voltage source outside the housing. It goes without saying that only if the high-voltage line and the electrically conductive inner wall of the flow channel are insulated from one another is the aforementioned potential difference between the corona discharge electrode and the inner wall as separation surfaces possible at all.

The rigid high-voltage line ends at a first corona discharge electrode. In the case of several corona discharge electrodes, which are preferably arranged one behind the other in the flow direction in the flow channel, the corona discharge electrodes are connected to one another by an electrically conductive rigid connection, e.g. a rigid metal beam connected to each other.

The rigid high voltage line is preferably axially in the first flow channel section, i. aligned with its free end downwards and has no electrical contact with the inner wall. The distance from the high-voltage line to the inner wall away from the at least corona discharge electrode to avoid deposits is also preferably greater than the aforementioned shortest distance between the circumferential edge of the corona discharge electrode and the closest inner wall.

The high-voltage line is led out of the flow channel preferably via a gas-impermeable high-voltage leadthrough away from the gas inlet. In order to reduce the risk of contamination by deposits from the flue gas to be cleaned on the inner wall and the high-voltage line and thus a basically possible risk of short-circuits, the gas-impermeable high-voltage bushing is provided away from the gas inlet.

A tubular electrical insulator is preferably also arranged around the high-voltage line on the high-voltage line in the flow channel itself. This insulator preferably extends from the gas-impermeable high-voltage bushing to shortly before or to the first electrode and electrically insulates the high-voltage line from the first flow channel section. The tubular electrical insulator also serves to improve the operational stability of the separator, to extend the length of the insulating surface between the aforementioned separation surface and high-voltage line, and to reduce electrical leakage currents.

In order to prevent the risk of a short circuit at the end of the insulator, it is proposed within the scope of one embodiment to configure the tubular electrical insulator so that it has an inner diameter greater than the outer diameter of the rigid high-voltage line. Between the high-voltage line and the tubular insulator, there is thus a clearance and thus a circumferential gap, the tubular electrical insulator being advantageously suspended from the gas-impermeable high-voltage bushing and the gap thus only being open at the bottom. This gap, especially when the gap width changes during operation, fundamentally makes it difficult to achieve a continuous deposit coating over the transition between the insulator and the high-voltage line across the open end of the gap. The tubular insulator preferably consists of a hose made of an elastic or pliable material, preferably a silicone, a silicone-containing material or another temperature-resistant elastic material. Alternatively, the tubular insulator can be elastically fixed in the aforementioned suspension. This has the advantageous effect that the insulator is moved relative to the high-voltage line by the flow of flue gas, as a result of which the aforementioned gap changes dynamically with the flow and possible deposits in and on the gap are loosened. Since the high-voltage line with the insulator is arranged in the first downward flow channel section from above at the high-voltage bushing down to the gap, the released deposits in the gap are carried downward out of the gap by gravity alone, thereby stabilizing the gap.

The tubular electrical insulator preferably ends at a predeterminable fixed distance before it is reached, ie above a first of the at least one corona discharge electrode. This prevents the particles deposited on the first of the at least one corona discharge electrode from reaching the lower end of the insulator as bulk material and possibly causing a short circuit or a leakage current path. This bed is created on the upward-facing surface of the corona discharge electrode, in that there is accumulation of particle masses discharged from the gap or directly from the flue gas. Said fixed distance preferably corresponds to between 10%, 20% or 30% to 50%, 70% or 80% of the maximum dimension of the first of the at least a disc-shaped corona discharge electrode. For electrostatic separators for small combustion systems, ovens, internal combustion engines with exhaust gas flow volumes in the range between 20 and 300 m ³ / h, the fixed distance is typically between 2 and 15 cm.

An optional temperature sensor for the flow channel is advantageous for operating the electrostatic separator for flue gas cleaning of combustion processes. Depending on the flue gas temperature, the flue gas cleaning can be activated or deactivated by applying an HV voltage to the at least one corona discharge electrode. The temperature is preferably detected by at least one temperature detection sensor in the first flow channel section or on the housing near the first flow channel section.

During operation of the electrostatic precipitator, there is a risk that smaller amounts of condensate will form on the inner walls of the flow channel, especially in the start-up phase before an operating temperature is reached, in particular on even colder areas of the inner wall, which will, however, be evaporated again by the hot gas during ongoing stationary operation and thus only negligibly impair the process stability of the electrostatic deposition. If the temperature conditions in the two flow channel sections do not permit evaporation, the condensates flow, driven by gravity, preferably continuously and vertically downwards into the collecting container. It is optionally proposed that the high voltage only be switched through to the at least one corona discharge electrode above 50 ° C to 70 ° C, preferably above 60 ° C, measured with the temperature detection sensor in the first flow channel cross section, and thus activate the electrostatic separation.

• 1a und b prinzipielle Ansichten von Ausführungsbeispielen für je einen elektrostatischen Abscheider mit einer Koronaentladeanordnung mit zwei scheibenförmigen Koronaentladungselektroden, bei der die Temperatur nahe der Hochspannungsdurchführung im Strömungskanal (1a) oder am Gehäuse (1b) ermittelt wird,
• 2 eine sowie prinzipielle Ansicht eines Ausführungsbeispiels in Anlehnung an 1a oder b (jedoch ohne Temperaturmessvorrichtung) mit abgenommen Sammelbehälter,
• 3 eine Querschnittdarstellung der in 1a dargestellten Ausführungsform auf der Höhe des Gaseintritts und des Gasaustritts,
• 4 eine beispielhafte Ausgestaltung eines starren Trägers mit den beiden Koronaentladungselektroden (nur angedeutet) im Bereich der Strömungsumlenkung der Ausführungsbeispiele gemäß 1a, 1b, 2 und 3 sowie
• 5 eine Detailansicht der Hochspannungsleitung im Bereich oberhalb der ersten Koronaentladungselektrode mit Ablagerungen von Partikeln.

The invention is explained in more detail with the aid of further exemplary embodiments, the following figures and descriptions. All the features shown and their combinations are not limited to these exemplary embodiments and their configurations. Rather, these should be viewed as being representative of further possible further configurations, which are not shown explicitly as exemplary embodiments. Show it

• 1a and b basic views of exemplary embodiments for each one electrostatic precipitator with a corona discharge arrangement with two disc-shaped corona discharge electrodes, at which the temperature near the high-voltage bushing in the flow channel ( 1a) or on the housing ( 1b) is determined
• 2 a and basic view of an embodiment based on 1a or b (but without temperature measuring device) with the collecting container removed,
• 3 a cross-sectional view of the in 1a the embodiment shown at the level of the gas inlet and gas outlet,
• 4th an exemplary configuration of a rigid carrier with the two corona discharge electrodes (only indicated) in the area of the flow deflection of the embodiments according to FIG 1a , 1b , 2 and 3 such as
• 5 a detailed view of the high-voltage line in the area above the first corona discharge electrode with deposits of particles.

In the 1a and b as well as 2 and 3 illustrated embodiments show a housing 1 of the electrostatic precipitator with a gas inlet 2 and a gas outlet 3 and between these arranged in the housing flow channel, comprising one in the flow direction 4th downwardly directed first flow channel section 5 , a flow deflector following the first flow channel section 6th into an upwardly directed second flow channel section 7th of the flow channel. The case 1 itself is open at the bottom, but is through a collecting container that closes the opening 8th finished with handles on both sides towards the outside. The housing and / or the collecting container are preferably made of metal and grounded in the exemplary embodiment.

1a shows an embodiment with laterally arranged gas inlet and gas outlet for use, for example, in a horizontal exhaust line, for example in a transition line between a furnace and a chimney shaft.

1b shows, however, an embodiment with a laterally arranged gas inlet and upwardly directed gas outlet, for example suitable for installation in a chimney shaft, into which the gas outlet opens directly.

In the representation of a first embodiment according to 1a are the circumferential lines or separations of the individual components to highlight the continuous flow channel in contrast to the illustration in 1b not shown.

The first and second flow channel sections are in favor of a compact construction 5 or. 7th arranged parallel to one another, more preferably arranged vertically parallel to one another.

Furthermore, the illustrated embodiments each include a corona discharge arrangement in the flow channel with two disc-shaped corona discharge electrodes 9 and 10 as well as separation surfaces 11 , suitable for the formation of a rotating electrical field 12 between the corona discharge electrode and the separation surfaces. As in the embodiments according to 1a and b, the two corona discharge electrodes are preferably one before and one after the flow deflection 6th arranged. The at least one corona discharge electrode is more preferably oriented orthogonally to the first and / or the second flow channel section. With a vertical alignment of the flow channel sections mentioned, the disk-shaped corona discharge electrodes are aligned horizontally.

The corona discharge electrodes 9 and 10 are like especially in 2 not shown in the housing 1 arranged, but protrude downward from the housing 1 out. As in 1a and b, they are inside the collecting container 8th arranged. Likewise, the areas on the separation surfaces with the shortest distance from one of the electrodes are entirely or partially, preferably predominantly formed by inner walls of the collecting container.

The two corona discharge electrodes 9 and 10 show how in 3 to be recognized schematically, circumferentially radially protruding electrode tips 25th on to which the field strengths of the electric field 12 are maximal. These electrode tips each preferably have the same distance A from the respectively closest deposition surface, so that the electric fields have approximately the same field strength over the entire circumference of the corona discharge electrodes.

The two corona discharge electrodes 9 and 10 are also, as in 4th represented by an electrically conductive rigid support 13 along the flow deflection 6th connected to each other, so that one and the same electrical potential is applied to them. The rigid support is only connected (electrically conductive) to the corona discharge electrodes, positions them relative to one another in the flow channel and preferably has no connection to other components, in particular to the inner walls of the flow channel, in particular in the area of the flow deflector 6th on. The carrier is preferably a sheet metal carrier, the sheet metal for this purpose as upright as possible, ie vertically and as aixal in the flow channel in the area of the deflection for the benefit of a minimal pressure drop in the gas flow 6th is arranged.

Furthermore, a rigid high-voltage line is shown in the figures 15th axially in the first flow channel section 6th arranged, both as a carrier element for fixing the corona discharge electrodes 9 and 10 in the flow channel as well as an electrical connection of this to a high voltage source 16 serves. The high-voltage line is through a high-voltage bushing 17th with a preferably ceramic element 18th , alternatively a glass element as an electrical insulator for the housing 1 from the top of the first flow channel 5 diverted and held. Furthermore, around the high-voltage line there is an elastic or pliable tubular electrical insulation, preferably a silicone hose 19th provided, which has a larger inner diameter than the outer diameter of the high-voltage line with the formation of an annular gap 21st having. The end of the hose 20th of the silicone hose 19th ends as previously explained and in 5 shown at a fixed distance H above the first corona discharge electrode 9 . The height H preferably exceeds the maximum possible bed height of the particle bed 22nd on the first corona discharge electrode 9 so that between the particle deposits 23 on the silicone tube 19th at the lower end of the hose 20th and the aforementioned particle bed 22nd on the first corona discharge electrode 9 .

The application of the high voltage source to the corona discharge electrodes 16 preferably takes place in a temperature-controlled manner, with a potential difference only being fed in from an adjustable operating temperature. It is proposed to have at least one temperature detection in the first flow channel section 5 above the gas inlet 2 to undertake. This is done by means of a temperature detection sensor 24 either selectively, as in 1a shown, in the inner volume or integrally over the wall surface, as in 1b shown, on the upper wall of the first flow channel section near the high-voltage bushing 17th .

A flow around the elastic or limp tubular electrical insulation, preferably the silicone hose, with flue gas advantageously causes a continuous or recurring movement of the hose end around the high-voltage line. The associated constant changes in the width of the gap 21st in the area of the hose end 20th leads to a detachment of particles from particles deposited on the hose and / or high-voltage line, in particular in the gap. The detached particles or particle agglomerates then fall under the force of gravity following on top of the first corona discharge electrode 9 .

In particular, unsteady flow components such as turbulence around the hose end lead to its constant movement. To this extent, within the framework of a preferred embodiment of the first flow channel section 5 this is optionally provided with corresponding sources of flow disturbance, not shown in further detail in the figures, such as baffles and / or separation edges, in which turbulence is generated locally and its flow trailing onto the hose end 20th , but more preferably not to the aforementioned electric fields 12 around the first corona discharge electrode 9 extends.

A particularly preferred embodiment of the aforementioned compact structure provides a housing 1 before, which includes a cylindrical internal volume (cf. 3 ), the one above the flow deflector 6th through a partition 14th with an electrically conductive and grounded surface as part of the separation surfaces is divided into two semi-cylindrical partial volumes, one of the partial volumes forming the first and the second flow channel section. This advantageously favors a cylindrical outer contour of the housing 1 of the electrostatic separator and thus also a design as a collection container 8th as a cylindrical pot with preferred uniform inside and outside diameter, ie a stepless transition in particular of the inside walls between the housing and the collecting container.

The collecting container can be attached to the lower opening of the housing and can be locked, for example, with a bayonet connection or with clamps. To prevent flue gas from escaping between the housing and the collecting container, a pair of sealing surfaces adapted to one another is optionally provided with a separate encircling sealing ring there. In a first embodiment, the collecting container and the housing, at least their inner walls, which form the flow channel, have the same electrical potential as the housing, preferably earth or zero potential. In a further optional embodiment, the collecting container and the housing are acted upon with a different electrical potential, whereby different electrostatic forces of attraction to the respective inner walls of the housing, i. first or second flow channel section, and sump, i.e. can be implemented in the area of flow deflection.

In the illustrated embodiments, the partition protrude 14th and the first and second flow channel sections extend 5 or. 7th from above into the collecting container 8th into it, while the area of flow deflection 6th below the partition 14th is provided in the collection container. In this case, a corona discharge electrode is arranged in each of the two flow channel sections on both sides of the dividing wall in the collecting container, which electrodes likewise protrude into the collecting container arranged on both sides of the dividing wall. The area of the inner wall of the flow channel, which is closest to the corona discharge electrodes, is thus shifted to the lower part of the partition and, like this, also into the collecting container.

In this way, at least some of the separation surfaces are shifted towards the inner walls of the collecting container, whereby the particle deposits advantageously take place directly in the collecting container and can be removed with this directly from the electrostatic separator. In addition, after the collection container has been removed, the corona discharge electrodes are accessible for cleaning, for example of deposits in the area of the high-voltage line.

List of reference symbols

1

casing

2

Gas inlet

3

Gas outlet

4th

Direction of flow

5

first flow channel section

6th

Flow deflection

7th

second flow channel section

8th

Collection container

9

first corona discharge electrode

10

second corona discharge electrode

11

Separation surfaces

12

rotating electric field

13

rigid beam

14th

partition wall

15th

High voltage line

16

High voltage source

17th

High voltage bushing

18th

ceramic element

19th

Silicone hose

20th

Hose end

21st

gap

22nd

Particle pouring

23

Particle deposition

24

Temperature detection sensor

25th

Electrode tips

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• CH 694645 A5 [0005]
• DE 102004039118 [0006]
• DE 102008049211 A1 [0007]

Claims (19)

Electrostatic separator for the cleaning of flue gases, comprising: a) a housing (1) with a removable collection container (8) for separated particles, a gas inlet (2) and a gas outlet (3) and a flow channel arranged in between in the housing and guided past the collection container, b ) a downwardly directed first flow channel section (5) of the flow channel following the gas inlet (2) downstream, c) a flow deflector (6) following the first flow channel section into an upwardly directed second flow channel section (7) of the flow channel, the second flow channel section in the Gas outlet (3) opens out and d) a corona discharge arrangement in the flow channel, comprising at least one disc-shaped corona discharge electrode (9, 10) and separation surfaces (11), suitable for the formation of a circumferential electrical field (12) between the at least one corona discharge electrode (9, 10) and the separation surfaces (11), dadur ch characterized in that e) the separation surfaces (11) are grounded and are entirely or partially formed by inner walls of the collecting container (8). Electrostatic precipitator after Claim 1 , characterized in that at least one of the, preferably all, disk-shaped corona discharge electrodes (9, 10) are arranged in the collecting container (8). Electrostatic precipitator after Claim 1 or 2 , characterized in that the at least one corona discharge electrode (9, 10) is fixed in the flow channel by a rigid high-voltage line (15) and is connected via this to a high-voltage source (16) outside the housing (1). Electrostatic precipitator after Claim 3 , characterized in that the rigid high-voltage line (15) is axially aligned in the first flow channel section (5) and opens out of the flow channel via a gas-impermeable high-voltage bushing (17) away from the gas inlet (2). Electrostatic precipitator after Claim 3 or 4th , characterized in that a tubular electrical insulator (19) is arranged around the rigid high-voltage line (15) in the flow channel. Electrostatic precipitator after Claim 5 , characterized in that the tubular electrical insulator (19) has an inside diameter larger than the outside diameter of the rigid high-voltage line (15), is suspended from the gas-impermeable high-voltage bushing (17) and is made of a hose made of an elastic or pliable material. Electrostatic precipitator after Claim 6 , characterized in that the material comprises or is silicone. Electrostatic precipitator after Claim 5 or 6th , characterized in that the tubular electrical insulator (19) ends at a predeterminable fixed distance (H) in front of a first of the at least one corona discharge electrode (9). Electrostatic precipitator after Claim 6 , characterized in that the predeterminable fixed distance (H) is between 2 and 15 cm. Electrostatic precipitator according to one of the preceding claims, characterized in that the corona discharge arrangement has two corona discharge electrodes (9, 10), one before and one after the flow deflection and the two corona discharge electrodes through an electrically conductive rigid support (13) along the flow deflection (6) are interconnected. Electrostatic precipitator according to one of the preceding claims, characterized in that the at least one corona discharge electrode (9, 10) has circumferentially radially protruding electrode tips (25), the distance (A) between the electrode tips and the closest separation surface (11) being uniformly the same. Electrostatic precipitator according to one of the preceding claims, characterized in that the at least one corona discharge electrode (9, 10) are aligned orthogonally to the first and / or the second flow channel section (5, 7). Electrostatic precipitator according to one of the preceding claims, characterized in that the first and second flow channel sections (5, 7) are arranged parallel to one another. Electrostatic precipitator after Claim 13 , characterized in that the first and the second flow channel section (5, 7) are oriented vertically and / or the at least one corona discharge electrode (9, 10) are oriented horizontally. Electrostatic precipitator after Claim 13 or 14th , characterized in that the housing (1) encloses a cylindrical internal volume which is located above the flow deflector (6) is divided by a partition (14) with an electrically conductive and grounded surface as part of the separation surfaces (11) into two semi-cylindrical partial volumes, one of the partial volumes forming the first and second flow channel sections (5, 7). Electrostatic precipitator after Claim 15 , characterized in that the partition (14) and the first and second flow channel sections (5, 7) protrude or extend from above into the collecting container (8), the deflection (6) is provided below the partition in the collecting container and in a corona discharge electrode (9, 10) is arranged in each of the two flow channel sections (5, 7) on both sides of the partition in the collecting container. Electrostatic separator according to one of the preceding claims, characterized in that the collecting container (8) is designed in a pot-shaped extension to the housing (1) and can be connected to the housing (1) in a sealing manner via a mechanical lock, preferably a bayonet lock. Electrostatic separator according to one of the preceding claims, characterized in that a temperature detection sensor (24) is arranged in the first flow channel section (5) or on the housing (1) near the first flow channel section. Electrostatic precipitator after Claim 18 , characterized in that the temperature detection sensor (24) is arranged above the gas inlet (2) in or on the first flow channel section (5).

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