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EP-4741062-A1 - ELECTROSTATIC PRECIPITATOR ASSEMBLY

EP4741062A1EP 4741062 A1EP4741062 A1EP 4741062A1EP-4741062-A1

Abstract

The invention relates to an electrostatic precipitator assembly (1) for arrangement in connection with an associated flue gas passageway (2). It comprises a discharge electrode (7), an insulator (8) for arrangement between an associated high voltage generator and the discharge electrode during use, and a connector rod (9) forming a connection between the discharge electrode and the insulator. A dust plate (10) of electrically non-conducting material, at least on the surface, is arranged at a distance from the flue gas passageway. The dust plate has a dust plate opening (16) through which the connector rod or an end region of the insulator extends. The electrostatic precipitator assembly may further comprise a shielding plate (12) configured to be mounted with its circumference arranged neighbouring a wall opening in a wall defining the associated flue gas passageway. The shielding plate comprises a shielding plate opening (15) through which flue gas can flow from the flue gas passageway towards the dust plate during use.

Inventors

  • LARSEN, ANDERS HØXBRO
  • Leftley, Christian
  • Hansen, Per Holm

Assignees

  • exodraft a/s

Dates

Publication Date
20260513
Application Date
20241108

Claims (15)

  1. Electrostatic precipitator assembly (1) for arrangement in connection with an associated flue gas passageway (2), such as a chimney or a chimney part, the electrostatic precipitator assembly (1) comprising: - a discharge electrode (7) configured to be arranged in the flue gas passageway (2) and configured to be electrically connected to an associated high voltage generator for providing an electric field being generated in a region around the discharge electrode (7) during use, - an insulator (8) configured to be arranged between the associated high voltage generator and the discharge electrode (7) during use, - a connector rod (9) forming a mechanical connection between the discharge electrode (7) and the insulator (8) and an electrical connection between the discharge electrode (7) and the associated high voltage generator during use, and - a dust plate (10) comprising electrically non-conducting material at least on the surface, the dust plate (10) being arranged at a distance from the flue gas passageway (2), the dust plate (10) having a dust plate opening (16) through which the connector rod (9) or an end region (21) of the insulator (8) to which end region (21) the connector rod (9) is connected extends while all or a remaining region, respectively, of the insulator (8) is placed next to a side of the dust plate (10) facing away from the flue gas passageway (2).
  2. Electrostatic precipitator assembly (1) according to claim 1, wherein the dust plate (10) is made from a material which has a surface resistivity in the order of 10 6 to 10 9 Ohm/square.
  3. Electrostatic precipitator assembly (1) according to claim 1 or 2, wherein the dust plate opening (16) is circular, or substantially circular, and has a diameter of 40-60%, such as 45-55%, such as around 50% of a diameter of the flue gas passageway (2) which the electrostatic precipitator assembly (1) is configured to be arranged in connection with during use.
  4. Electrostatic precipitator assembly (1) according to claim 1 or 2, wherein the dust plate opening (16) is circular, or substantially circular, and has a diameter of 70-90mm, such as 75-85mm, such as 78-82mm.
  5. Electrostatic precipitator assembly (1) according to any of the preceding claims, wherein the dust plate opening (16) has a surrounding edge (17) with a surface extending circumferentially as well having a width which is parallel or substantially parallel to a longitudinal axis of the connector rod (9).
  6. Electrostatic precipitator assembly (1) according to claim 5, wherein the width of the surrounding edge (17) is 0.5-10mm, such as 1-5mm, such as 1-2mm.
  7. Electrostatic precipitator assembly (1) according to claim 5 or 6, wherein the dust plate (10) has a larger thickness than the width of the surrounding edge (17) and wherein the dust plate opening (16) is chamfered so that the surrounding edge (17) is closest to the associated flue gas passageway (2) during use.
  8. Electrostatic precipitator assembly (1) according to any of the preceding claims, further comprising a shielding plate (12) configured to be mounted with its circumference arranged neighbouring a wall opening (13) in a wall (14) defining the associated flue gas passageway (2), the shielding plate (12) comprising a shielding plate opening (15) through which flue gas can flow from the flue gas passageway (2) towards the dust plate (10) during use.
  9. Electrostatic precipitator assembly (1) according to claim 8, wherein the shielding plate (10) is dimensioned and shaped so that it is configured to be arranged, during use, in an inspection hole of an associated inspection hatch (3) forming the chimney part.
  10. Electrostatic precipitator assembly (1) according to claim 8, wherein the shielding plate (12) is an annular ring dimensioned and shaped to be arranged, during use, at a connection between pipe sections (20) of a T-pipe forming the chimney part.
  11. Electrostatic precipitator assembly (1) according to any of claims 8-10, wherein a shortest distance between the shielding plate (12) and the dust plate (10) is 40-60mm, such as 50-55 mm.
  12. Electrostatic precipitator assembly (1) according to any of the preceding claims, further comprising an insert (19) onto which the insulator (8), the dust plate (10), and the shielding plate (12) are mounted.
  13. Electrostatic precipitator assembly (1) according to any of the preceding claims, further comprising a housing (11) accommodating at least the insulator (8) and the dust plate (10).
  14. Electrostatic precipitator assembly (1) according to any of the preceding claims, wherein the insulator (8) is arranged with a longitudinal axis parallel to the connector rod (9) or perpendicular to the connector rod (9).
  15. System for cleaning a flue gas flowing in an associated flue gas passageway (2), such as a chimney or a chimney part, comprising: - an electrostatic precipitator assembly (1) according to any of the preceding claims, - a high voltage generator, and - a T-pipe or an inspection hatch comprising at least a part of the associated flue gas passageway (2).

Description

FIELD OF THE INVENTION The present invention relates to an electrostatic precipitator assembly for arrangement in connection with an associated flue gas passageway. In particular, it relates to such an electrostatic precipitator assembly having a design with which it is possible to limit or avoid the build-up of particles on the insulator and thereby ensure a high efficiency in the removal of particles from the flue gas passageway. BACKGROUND OF THE INVENTION An electrostatic precipitator system can be used for reducing the number of fine and ultrafine particles in an aerosol or a flow of flue gas from e.g. a wood-burning stove or a pellet boiler. In such a system, an electric field is generated by a discharge electrode arranged in the flue gas passageway, typically a chimney, and connected to a high voltage generator. The electric field causes the aerosol or flue gas around the discharge electrode to become ionized. Hereby either free electrons or charged gas molecules become trapped on the particles and thereby charge the particles. The charged particles are repulsed from the discharge electrode towards a grounded collection electrode on which they settle and build up and from where they can subsequently be removed in a controlled manner. Hereby the amount of pollution can be significantly lowered. The electrostatic precipitator system comprises an insulator which is arranged between the high voltage generator and the discharge electrode. A connector rod forms a mechanical connection between the discharge electrode and the insulator and an electrical connection between the discharge electrode and the associated high voltage generator. Typically, a high voltage cable passes through the insulator and connects to the connector rod to the high voltage generator. All these components are typically arranged in a housing mounted laterally onto the chimney forming the flue gas passage. The connector rod extends through an opening in the side wall of the flue gas passageway, and this opening and the surrounding gas flow patterns mean that a small amount of particle-containing flue gas flows into the housing in which the insulator is arranged. The high voltage, typically in the order of 30,000V results in some of the particles being deposited on the insulator. These particles comprise carbon dust which is electrically conducting thereby resulting in a current running between the deposited particles and the plate on which the insulator is mounted. This means that there is less power available for the functioning of the discharge electrode whereby the efficiency of the cleaning process is reduced. Hence, an improved electrostatic precipitator assembly would be advantageous, and in particular a more efficient and/or reliable electrostatic precipitator assembly would be advantageous. OBJECT OF THE INVENTION It is an object of the present invention to provide an electrostatic precipitator assembly with which it is possible to control the flow of flue gas into the space between an insulator of the electrostatic precipitator assembly and a flue gas passageway in connection with which the electrostatic precipitator assembly is arranged. It is another object of the present invention to provide an electrostatic precipitator assembly with which the build-up of particles on an insulator of the electrostatic precipitator assembly can be limited, such as avoided, compared to other similar known assemblies. It is another object of the present invention to provide an electrostatic precipitator assembly with which a high efficiency in the removal of particles from the flue gas passageway is obtained. It is an object of some embodiments of the present invention to provide an electrostatic precipitator assembly which is configured to be arranged in connection with an inspection hole of a known inspection hatch arranged in a flue gas passageway, such as a chimney. It is another object of some embodiments of the present invention to provide an electrostatic precipitator assembly which is configured to be arranged at a connection between pipe sections of a T-pipe forming a chimney part. It is a further object of the present invention to provide an alternative to the prior art. In particular, it may be seen as an object of the present invention to provide an electrostatic precipitator assembly that solves the above-mentioned problems of the prior art. SUMMARY OF THE INVENTION The above-described object and several other objects are intended to be obtained in a first aspect of the invention by providing an electrostatic precipitator assembly for arrangement in connection with an associated flue gas passageway, such as a chimney or a chimney part, the electrostatic precipitator assembly comprising: a discharge electrode configured to be arranged in the flue gas passageway and configured to be electrically connected to an associated high voltage generator for providing an electric field being generated in a region around the discharge elect