Wood-burning stove with electrostatic particle separator

Description

[0001] The invention relates to a fireplace stove with a smoke deflection chamber arranged above its combustion chamber, which is provided with two identically designed smoke outlets, the first of which exits upwards and the second towards the rear of the fireplace stove, wherein one of these smoke outlets is connected to a flue pipe leading to the chimney, while the other smoke outlet is closed by a blind cover.

[0002] The purpose of the two flue outlets leading from the baffle chamber is to allow the stove, as designed, to be connected to either a vertically upward-facing or a horizontally downward-facing flue pipe without any structural modifications. When a vertically upward-facing flue pipe is connected, the horizontally downward-facing flue outlet of the baffle chamber is closed with the blanking plate. Conversely, when a horizontally downward-facing flue pipe is connected, the vertically upward-facing flue outlet of the baffle chamber is closed with the blanking plate. Naturally, identical connection flanges are required at all interfaces for both the flue pipe and the blanking plate.

[0003] For some time now, there has been a requirement to reduce the dust contained in the flue gases of wood-burning stoves. To this end, it is known to install electrostatic dust separators in suitable locations, usually outside the stove in the area behind its flue outlet or at the chimney. Such electrostatic dust separators generally require considerable installation space and complex electrical wiring.

[0004] In the prior art, such fireplaces are disclosed, for example, in the documents DE 20 2009 013497 U1, EP 1 193 445 B1, EP 4 033 150 A2, EP 3 736 491 A1 and DE 10 2008 005096.

[0005] The object of the invention is to use the smoke deflection chamber and its specially designed smoke outlets in a fireplace of the type mentioned above for electrostatic dust separation.

[0006] To solve this problem, the invention proposes, starting from a fireplace of the type mentioned at the outset, that the walls of the smoke deflection chamber and the subsequent smoke outlets are designed as separation electrodes of an electrostatically acting dust separation device, and that a spray electrode is arranged in the interior of the smoke deflection chamber, which is electrically insulated from the blind cover.

[0007] Electrostatic dust collection devices for separating fine dust from flue gas often operate with a negatively charged spray electrode (cathode), which electrostatically charges the dust particles contained in the flue gas, and with large-area collection electrodes with zero potential (anode), on which the electrically charged dust particles are deposited. According to the invention, the walls and deflection devices of the flue gas deflection chamber, as well as the subsequent flue outlets, are used as collection electrodes. They are therefore made of an electrically conductive metal and are appropriately grounded. According to the invention, the spray electrode used to charge the dust particles contained in the flue gas is electrically insulated from the blanking plate and projects freely into the interior of the flue gas deflection chamber used as the collection electrode.

[0008] A particularly preferred embodiment of the invention provides that the blind cover carrying the spray electrode is connected to a high-voltage supply line, which is passed through the blind cover from the outside and then runs through a tubular insulator attached to the inside of the blind cover, which extends into the interior of the smoke deflection chamber and is provided at its distal end with an electrode holder that holds the spray electrode connected to the high-voltage supply line in position.

[0009] By using the existing blanking plate as a spray electrode holder, a considerable amount of installation space for the electrostatic dust separator is saved, and in addition, the possibility is created to easily retrofit existing wood-burning stoves of the aforementioned type with such a dust separator.

[0010] Furthermore, the tubular insulator is positioned centrally within the smoke outlet of the smoke deflection chamber, which is covered by the blind cover, while the spray electrode, supported by the blind cover, is located centrally within the smoke outlet of the smoke deflection chamber, which is connected to the smoke pipe. This ensures that all high-voltage components maintain a maximum distance from the surrounding components at zero potential, thus preventing spark discharges.

[0011] Particularly good insulation of the high-voltage supply line is achieved when the tubular insulator is designed as a glass tube that surrounds the high-voltage supply line with a distance of at least 5 millimeters and is also evacuated.

[0012] An embodiment of the invention is explained in more detail below with reference to the drawing. The drawing shows: Figure 1: schematically in a vertical section a fireplace according to the invention with a vertically connected flue pipe; Figure 2 : schematically in a vertical step a fireplace according to the invention with a horizontally connected flue pipe; Figure 3 : schematically in side view the blind cover with the support device for the spray electrode.

[0013] In the drawing, the housing of the wood-burning stove is designated by reference numeral 1. This housing 1 contains a combustion chamber 2, the interior of which is visible from the outside through a glass pane 3.

[0014] Above the combustion chamber 2, in the housing 1, there is a smoke deflection chamber 4, which is equipped with two deflection plates 4a and 4b and has two identically designed smoke outlets 5 and 6, of which the first (namely the smoke outlet 5) leads vertically upwards and the second (namely the flue gas outlet 6) leads horizontally to the rear out of the housing 1 of the stove or its smoke deflection chamber 4.

[0015] The walls of the smoke deflection chamber 4, as well as its deflection plates 4a and 4b, and the walls of the smoke outlets 5 and 6 are made of electrically conductive metal and are grounded so that they can serve as a separating electrode in the electrostatic dust separation device described below.

[0016] At the in Figure 1In the illustrated embodiment, a flue pipe 7 leading to a chimney (not shown) is connected to the vertically upward-leading flue outlet 5. Furthermore, the horizontally rearward-leading flue outlet 6 is covered by a blanking plate 8. The connecting elements (flange connections) between the flue outlet 5 and the flue pipe 7 on the one hand, and between the flue outlet 6 and the blanking plate 8 on the other, are identical, so that, if necessary, the flue pipe 7 can also be attached to the horizontal flue outlet 6 and the blanking plate 8 to the vertical flue outlet 5, as shown in Figure 2 is shown.

[0017] According to the invention, the blind cover 8 is provided with a high-voltage supply line 9, which is insulated and passes through the blind cover 8 from the outside and then runs through a tubular insulator 10 attached to the inside of the blind cover 8. This insulator 10 is designed as an evacuated glass tube that surrounds the high-voltage supply line 9 at a minimum distance of 5 mm and is provided at its distal end with an electrode holder 11, which carries a spray electrode 12.

[0018] The dimensions, shape, and position of the insulator 10, the electrode holder 11, and the spray electrode 12 are adapted to the shape of the smoke deflection chamber 4 and its smoke outlets 5 and 6 such that the tubular insulator 10 runs centrally through the smoke outlet 5 or 6 covered by the blind cover 8, and the spray electrode 12, supported by the blind cover 8, is always arranged centrally in the smoke outlet 5 or 6 of the smoke deflection chamber 4 connected to the smoke tube 7 (see figure). Fig. 1 u. Fig 2 ).

[0019] The Figure 3 shows the blanking plate 8 in its removed state with its high-voltage supply line 9, the insulator 10, the electrode holder 11 and the spray electrode 10 running at right angles to the insulator 10.

[0020] During operation, the spray electrode 10 electrostatically charges the dust particles contained in the smoke rising from the combustion chamber 2 of the fireplace, so that these dust particles are deposited on the walls of the smoke deflection chamber and its smoke outlets, which serve as separation electrodes, and can be detached from time to time by suitable measures, such as blowing or shaking, and returned to the combustion chamber 2. Reference symbol list

[0021] 1 Housing 2 Combustion chamber 3 Glass pane 4 Smoke deflection chamber, 4a Deflector plate, 4b Deflector plate 5 Vertical smoke outlet 6 Horizontal smoke outlet 7 Smoke pipe 8 Blanking plate 9 High-voltage supply line 10 Insulator 11 Electrode holder 12 Spray electrode

Claims

1. Wood-burning stove with a smoke deflection chamber (4) arranged above its combustion chamber (2), which is provided with two similarly designed smoke outlets (5, 6), the first of which (5) exits the wood-burning stove upwards and the second (6) exits the wood-burning stove backwards, whereby one of these smoke outlets (5 or 6) is connected to a flue pipe (7) leading to the chimney, while the other smoke outlet (6 or 5) is closed by a blind cover (8), characterized in that that the walls of the smoke deflection chamber (4) and the adjoining smoke outlets (5, 6) are designed as separation electrodes of an electrostatic dust separation device, and that in the interior of the smoke deflection chamber (4) a spray electrode (12) is arranged which is carried and electrically insulated from the blind cover.

2. Wood-burning stove according to claim 1, characterized in that that the blind cover (8) carrying the spray electrode (12) (8) is connected to a high-voltage supply line (9) which is fed through the blind cover (8) from the outside and then runs through a tubular insulator (10) attached to the inside of the blind cover (8), which extends into the interior of the smoke deflection chamber and is provided at its distal end with an electrode holder (11) which holds the spray electrode (12) connected to the high-voltage supply line (9) in position.

3. Wood-burning stove according to claims 1 and 2, characterized in that the tubular insulator (10) runs centrally through the smoke outlet (5 or 6) covered by the blind cover (8) and the spray electrode (12) carried by the blind cover (8) is arranged centrally in the smoke outlet (6 or 5) connected to the flue pipe (7).

4. Wood-burning stove according to claims 2 or 3, characterized in that the tubular insulator (12) is designed as a glass tube, which surrounds the high-voltage supply line (9) at a distance of at least 5 millimeters.

5. Wood-burning stove according to claim 4, characterized in that the insulator (10) designed as a glass tube is evacuated.