Electrostatic precipitator system having a discharge electrode with suspended wire

The electrostatic precipitator system with a customizable discharge electrode and movable grid efficiently collects ultrafine particles from wood combustion flue gas, addressing inefficiencies and health hazards by ensuring uniform electric field distribution and regular self-cleaning.

EP3492174B1Active Publication Date: 2025-10-22EXODRAFT
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Patent Information

Application Number
EP2018209941
Authority / Receiving Office
EP · EP
Patent Type
Patents
Current Assignee / Owner
Priority Date
2017-12-04
Filing Date
2018-12-03
Publication Date
2025-10-22
Estimated Expiration
2038-12-03

AI Technical Summary

Technical Problem

Existing electrostatic precipitator systems are inefficient in removing ultrafine particles from wood combustion flue gas, leading to health hazards due to particle penetration into the lungs, and face issues with particle build-up and clogging that reduce collection efficiency over time.

Method used

An electrostatic precipitator system with a discharge electrode comprising conductive wires suspended between connectors, supported by a rod, generates a customizable electric field to enhance particle charging and collection, using a secondary collection electrode and a movable grid for self-cleaning, with a uniform electric field distribution to improve efficiency.

Benefits of technology

The system effectively collects ultrafine particles on a larger surface area, reduces re-entrainment, and facilitates regular self-cleaning, maintaining high efficiency and preventing particle detachment, thus enhancing the removal of harmful particles from wood combustion flue gas.

✦ Generated by Eureka AI based on patent content.

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Abstract

The present invention relates to an electrostatic precipitator (ESP) system (1) for removal of dry particles from the flue gas in a chimney connected to e.g. a wood burning stove. The ESP system comprises a discharge electrode having a discharge electrode connector (204), which is connected to a high voltage generator (12), providing for an electric field around the discharge electrode. The discharge electrode is arranged in a flow passage part of which is delimited by a collection plate (5) forming the collection electrode of the ESP system. The discharge electrode has a first and a second wire connectors (201,202) which are connected to and separated a distance apart by a support rod (203). The first and second wire connectors have at least one wire (205) suspended between them. All the mentioned parts of the discharge electrode comprise, such as are made from, electrically conductive material.
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Claims

1. An electrostatic precipitator system (1) for dry particle precipitation, the system comprising: - a flue gas inlet (2) for receiving a flow of flue gas, - a flue gas outlet (3) for venting the flow of flue gas, - a flow passage (4) extending between the flue gas inlet (2) and the flue gas outlet (3), part of the flow passage (4) being delimited by a collection plate (5), the collection plate (5) comprising an electrically conductive material, - a high voltage generator, and - a discharge electrode (11) comprising: - a discharge electrode connector (204), which is connected to the high voltage generator (12), the high voltage generator (12) providing for an electric field being generated in a region around the discharge electrode (11) when the high voltage generator (12) is turned on, and - a first and a second wire connector (201,202), which are connected to and separated a distance apart by a support rod (203), the first and second wire connectors (201,202) having at least one wire (205) suspended between them, wherein the discharge electrode connector (204), the first and second wire connectors (201,202), the support rod (204), and the at least one wire (205) all comprise electrically conductive material, wherein the discharge electrode (11) is arranged inside the part of the flow passage (4) delimited by the collection plate (5), and wherein the connection between the discharge electrode (11) and the high voltage generator (12): - goes through an insulator (13) arranged between the high voltage generator (12) and the discharge electrode (11), or - is provided with other insulator means configured to hold the discharge electrode and prevent shortcutting of the system when the high voltage generator is turned on.

2. An electrostatic precipitator system (1) according to claim 1, wherein the at least one wire (205) has a characteristic width of 0.20 - 3.0 mm, such as 0.30 - 1.0 mm, such as 0.35 - 0.45 mm.

3. An electrostatic precipitator system (1) according to any of the previous claims, wherein the distance between the first and second wire connectors (201,202) is 100 - 1000 mm, such as 300 - 800 mm, such as 450 - 650 mm.

4. An electrostatic precipitator system (1) according to any of the previous claims, wherein the discharge electrode connector (204) is attached to the support rod (203) and located at a distance from the first and second wire connectors (201,202).

5. An electrostatic precipitator system (1) according to any of the previous claims, comprising a plurality of wires (205), wherein a first end (206) of the support rod (203) is mounted within a central region of the first wire connector (201), and a second end (207) of the support rod (203) is mounted within a central region of the second wire connector (202) such that the plurality of wires (205) can be arranged around the support rod (203).

6. An electrostatic precipitator system (1) according to any of the previous claims, wherein the first and second wire connectors (201,202) are shaped as disks each of which are shaped substantially as a circular segment.

7. An electrostatic precipitator system (1) according to claim 6, comprising a plurality of wires (205), wherein the wires (205) are fastened at or near an edge of the first and second wire connectors (201,202) and the wires (205) are distributed around the circumference of the disks.

8. An electrostatic precipitator system (1) according to any of the previous claims, wherein the at least one wire (205) is parallel to the support rod (203).

9. An electrostatic precipitator system (1) according to claim 8, wherein each of the first and second wire connectors (201,202) has a shape in the horizontal plane corresponding to that of a horizontal cross-section of the flow passage (4) delimited by the collection plate (5) when viewed in the vertical direction.

10. An electrostatic precipitator system (1) according to any of the preceding claims, wherein a voltage of 20 - 50 kV, such as 25 - 40 such as 25 - 35 kV, is generated by the high voltage generator (12), when the system (1) is in use.

11. An electrostatic precipitator system (1) according to any of the preceding claims, wherein the distance between the first and second wire connectors (201,202) is 100 - 200 mm shorter than the vertical length of the collection plate (5).

12. An electrostatic precipitator system (1) according to any of the preceding claims, further comprising a grid (101) being arranged within the collection plate (5), the grid (101) comprising a mesh-like structure, such as a mesh or a plate with holes, the mesh-like structure of the grid (101) being made of an electrically conductive material, and the grid (101) being dimensioned, shaped and arranged such that it extends along and at a distance from the collection plate (5), and the grid (101) and the collection plate (5) together forming a collection electrode.

13. An electrostatic precipitator system (1) according to claim 12, further comprising an actuator (112) for, when the actuator (112) is in operation, providing an upwards force to move the grid (101) upwards, so that the grid (101), after being moved upwards, drops from a height due to gravity resulting in the grid (101) impacting on an internal bottom structure (109) of the electrostatic precipitator system.

Citation Information

Patent Citations

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    EP0044361A1

  • Device to clean exhausts from small heating systems

    EP1193445A2

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    US20160288138A1