DE8801073U1 - Heating device for solid fuels, especially tiled stove insert - Google Patents

Description

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Böekhöff & Co,

LEÖA-Werk GmbH S Go, KG ₁ Groninger Str» 1Ö

2950 Leer

"Heating device for solid fuels, in particular tiled stove insert"

The invention relates to a heating device for solid fuels, in particular a tiled stove insert, with a vibrating grate, in particular in the form of a double grate that can be moved into the closed and open position, a main combustion chamber and with an inlet for the

Primary air from below through the grate and preferably also at the level of the ember bed, horizontally through the ember bed, with a smoke outlet in the upper area of the rear wall or the adjoining upper cover and with a post-combustion chamber which is connected to the main combustion chamber via a flue gas transfer opening and into which post-combustion air guided through air preheating ducts is introduced in the area of the flue gas transfer opening.
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Heating devices similar to the above-mentioned type are known (DE-PS 32 39 267), which are designed as central heating boilers for solid fuels, in which the primary air is led over the grate through the ember bed in order to achieve lower combustion. In this known device, the afterburning air is arranged between the combustion chamber forming a filling shaft and the rear wall of the boiler ₍ which extends from the bottom above the ember bed to the upper cover of the boiler and is in open connection with downstream heating gas flues. The afterburning air is led via a vertical preheating shaft on the front into the upper area of the main combustion chamber and must flow downwards through the ember bed in the rear area in order to reach the flue gas transfer opening between the main combustion chamber and the afterburning chamber.

In another known heating device, in particular a tiled stove insert (DE-OS 36 06 125), in order to achieve complete combustion in the area between the main combustion chamber and the rear J

A post-combustion shaft is provided in the wall of the facility, which is connected to the main combustion chamber via a lower flue gas transfer opening at the level of the ember bed.

chamber is in open connection. The supply |

In the above arrangement, the afterburning air is supplied via horizontal air preheating ducts in the side walls of the heating device at the height of the ember bed. A cross-sectional constriction is provided above the flue gas transfer opening, in the area of which the afterburning air is supplied to the flue gases. The above heating device is also designed for lower combustion.

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The heating devices of the type described are structurally very complex due to the arrangement of the afterburning chambers provided in the depth behind the main combustion chamber and the design of the flue gas transfer openings to the afterburning chambers. They are only suitable for underburning and require a diversion of the flue gases that arise in the main combustion chamber above the ember bed or that enter this space, against the thermal buoyancy effect, in a downward direction to the flue gas transfer opening in the afterburning chamber. Since a considerable part of the depth of the heating devices is used by the afterburning chamber and the flue gas ducts that may be connected to it, the depth of the main combustion chamber is correspondingly limited.

The invention is based on the object of designing a heating device of the type mentioned in the introduction in such a way that the transfer of all flue gases generated in the main combustion chamber into the afterburning chambers is facilitated with little structural effort and a long flow path is formed in this chamber without congestion of the flue gases, so that a safe complete combustion of the carbonization gases and favorable utilization of the heat generated in the process is achieved.

To achieve the above object, the heating device mentioned at the beginning is characterized in that the afterburning chamber is arranged above the main combustion chamber and between these chambers a horizontal partition wall with at least one air preheating channel provided therein is provided, that the partition wall separates the chambers while leaving the flue gas

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that the passage opening is limited to the area of the rear wall of the device and that above and parallel to the aforementioned partition wall there is a further partition wall projecting from the rear wall of the device with a passage opening that can be closed by a heating flap in the area of the rear wall of the device.

Due to the above arrangement of the afterburning chamber, the entire depth of the heating device in the area of the main combustion chamber is available for this combustion chamber, so that, particularly when the heating device is designed as a tiled stove insert, heating can also be carried out using relatively long logs. The flue gases produced in the main combustion chambers reach the afterburning chamber via the flue gas transfer opening as a result of thermal buoyancy, are deflected horizontally there, but are again deflected as a result of thermal buoyancy into the space above the partition wall protruding from the rear wall of the device before they reach the flue gas outlet. The design described gives the post-combustion chamber a cross-section that is roughly equivalent to a horizontal U, which results in a correspondingly long path for the flue gases entering the post-combustion chamber, without the risk of the flue gases becoming blocked, as they do not have to flow in a direction opposite to the thermal buoyancy. On the other hand, the long flow paths in the post-combustion chamber ensure safe and complete post-combustion when sufficient post-combustion air is supplied, and also enable heat to be released to the walls of the heating device during this post-combustion.

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To form the post-combustion chamber, only the two partition walls arranged one above the other are required. When the heating flap arranged in the upper partition wall projecting from the rear wall of the device is moved to the open position, it opens up a flue gas passage opening that is aligned with the flue gas passage opening and thus enables the flue gases to be extracted from the main combustion chamber into the smoke extractor via the shortest possible route during heating. Due to the integrated arrangement of the pivoting heating flap in the aforementioned partition wall, the heating flap in the closed position serves as part of the boundary wall of the post-combustion chamber in the area of the flue gas inlet into this chamber.

Since the partition wall provided between the main combustion chamber and the post-combustion chamber is heated by the radiant heat and also by the flue gases flowing against this partition wall when there is an appropriate bed of embers in the main combustion chamber, a very high degree of preheating results from the post-combustion air flowing through the air pre-heating channel in this partition wall to the post-combustion chamber.

The supply of post-combustion air to the air pre-heating channel in the partition wall between the main combustion chamber and the post-combustion chamber can be directly from the front of the heating device.

30 bar in the air preheating channel mentioned. However, a design according to claim 2 is particularly useful, in which the post-combustion air is already preheated when it enters the air preheating channel described above in the partition wall. Due to the long wave of the post-combustion air through the air preheating channel,

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This results in an even greater warming of the air. At the same time, cooling of the partition wall provided with the air preheating duct in the area of the air inlet is avoided.

For the joint supply of the afterburning air into the vertical preheating channels in the front boundary wall of the main combustion chamber, according to claim 3 _a preheating chamber connected to these preheating channels can be provided, which is equipped with an air inlet opening adjustable by means of a slide valve.

Further details of the heating device are given in claims 4 and 5.

The drawing shows an embodiment of the invention in various sectional views.

Show it:

Fig. 1 shows a central longitudinal section parallel to the side view of the heating device.

Fig. 2 is a section through the arrangement according to Fig. 1 along the section line II-II,

Fig. 3 is a section through the arrangement according to Fig.

1 along section line III-III, 30

Fig. 4 is a sectional view of the arrangement according to Fig. 1 along the section line IV-IV.

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The heating device shown in the figures represents a tiled stove insert, which has an outer casing made of cast iron, which is made up of several parts and is designated as a whole with ribs la formed on the individual parts of this outer casing 1 and pointing outwards. In the upper cover 1b of the outer casing 1, in the area of the rear wall 1d of the outer casing 1, an upward-facing smoke outlet 3 with a cylindrical cross-section is formed. The front wall of the outer casing 1 is equipped with a filling door 4 and an ash door 5. In the lower area of the ash door, a manually operated air slide 6 is arranged for supplying the primary air into the interior of the heating device. On the inside of the rear wind and the front wall outside the filling and ash tray as well as the inside of the cover 1b outside the smoke outlet 3, a fireproof lining 7 is provided, which can consist of a calcium silicate fiber fleece in the area of the cover 1b and the front wall.

Above the removable ash box 8 arranged on the floor 1c of the heating device, a grate is provided, which in the example shown is designed as a double grate 9 that can be moved into the closed and open position. Immediately above the double grate 9, a supply nozzle 10 is arranged for the supply of primary air in a horizontal direction through the bed of embers that forms on the grate 9.

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Above the grate 9 is the main combustion chamber, designated as 11 in its entirety, which is limited at the top by a horizontal partition wall 12 at the height of the upper edge of the filling door 4. The partition wall 12 simultaneously forms the lower limit of the afterburning chamber 13 provided above the main combustion chamber 11, which is divided by a further partition wall 14 extending above the partition wall 12 from the rear wall 1d and parallel to the partition wall 12 in such a way that the afterburning chamber 13 forms a horizontal U in cross-section and the flue gases flowing into the afterburning chamber 13 must follow the U-shape of the afterburning chamber 13 in their flow path.

The partition wall 12 ends at a distance in front of the rear wall ld, so that in this area a flue gas transfer opening 15 remains, through which the flue gases rising from the main combustion chamber 11 enter the post-combustion chamber 13. The partition wall 12 encloses at least one air preheating channel 16, or it is designed as a hollow wall to form an air preheating channel 16. Post-combustion air is led through the air preheating channel 16, which is fed to the flue gases flowing into the post-combustion chamber 13 through nozzle-shaped openings 17 in the area of the flue gas transfer opening 15.

The further partition wall 14 projecting above the partition wall Ii is provided with an opening 19 in the area of the rear wall 1d of the heating device that can be closed by a heating flap 18. The heating flap 18 can be pivoted about a pivot axis 20 into the closed and open positions and for this purpose can be moved into the external position via a pull and push element 21.

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drawn and dashed position. The pull and push member 21 extends in the example through the air heating channel 16 in the partition wall 12 and is connected to the filling door 4, so that when the filling door is opened the heating flap is also moved into the dashed position to release the opening 19. By means of a further manual actuating device not shown in the drawing, the heating flap can be moved into the position to release the opening 19 in the projecting partition wall 14 even when the filling door is closed.

In the example shown, the partition wall 12 is designed as a hollow chamber wall in the area facing the main combustion chamber, with the hollow chamber being delimited by metal walls so that good heat transfer to the post-combustion air flowing through the hollow chamber wall takes place. However, towards the post-combustion chamber 13, the partition wall 12 is provided with thermal insulation 22 so that in this area the main combustion chamber 11 is thermally insulated from the post-combustion chamber 13.

In the example shown, the supply of post-combustion air to the hollow chamber 16 of the partition wall 12 is carried out by vertical preheating channels 23 and 24 provided on both sides of the filling door 4 in the front boundary wall, which are particularly clearly visible in the sectional view according to Fig. 4. These preheating channels 23 and 24 extend upwards to the height of the partition wall 12 and are there in open connection with the air preheating channel 16, which is formed by the partition wall 12 designed as a hollow wall. The lower ends of the preheating channels 23 and 24 are also in open connection

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with an air preheating chamber 25 directly below the filling door 4 and partially covering the ash door 5, which borders the main combustion chamber 11 towards the front of the furnace just above the ember bed. The supply of the post-combustion air to the preheating chamber 25 is carried out by a manually operable slide 26 provided in the ash door 5, through which, when opened, the post-combustion air can enter the preheating chamber 25 through the inlet opening 27.

The secondary combustion air is thus preheated in the preheating chamber 25 by the radiation and/or contact heat caused by the bed of embers during operation of the heating device and passes through the preheating channels 23 and 24, which are also adjacent to the main combustion chamber, into the air preheating channel 16, the partition wall 12 designed as a hollow chamber wall.

From the illustrated embodiment it is clear that the main combustion chamber 11 extends over the entire depth of the heating device, so that despite the presence of the afterburning chamber, a large-volume main combustion chamber 11 is available for accommodating even bulky heating material, such as large logs. Regardless of whether the device is operated with logs or other solid fuels and also regardless of the type of air supply to the fuel - depending on the position of the double grate 9 - the flue gases are guided into the afterburning chamber 13 as a result of their thermal buoyancy and, by flowing around the partition wall 12, contribute to preheating the afterburning air guided in the air preheating channel 16 located therein to the afterburning chamber 13 or the flue gas inlet opening 15.

Claims (2)

8243 claims 1. Heating device for solid fuels, in particular tiled stove insert, with a vibrating grate, in particular in the form of a double grate that can be moved into the closed and open position, a main combustion chamber and with an entry of the primary air from below through the grate and preferably also at the level of the ember bed, horizontally through the ember bed, with a suction extractor in the upper area of the rear wall or the adjoining upper cover and with a post-combustion chamber, which is connected to the main combustion chamber via a flue gas transfer opening and into which post-combustion air guided through air preheating channels is introduced in the area of the flue gas transfer opening, characterized in that the post-combustion chamber (13) is arranged above the main combustion chamber (11) and between these chambers a horizontal partition wall (12) with at least one air preheating channel (16) provided therein is provided, that the partition wall (12) separates the chambers while leaving the Flue gas passage opening (15) is limited in the area of the rear wall of the device and that above and parallel to the aforementioned partition wall, a further partition wall (14) protruding from the rear wall of the device with a passage opening (19) that can be closed by a heating flap (18) is arranged in the area of the rear wall of the device. I * I 2. Heating device according to claim 1, characterized in that for the supply of the afterburning air to the partition wall (12) between the main combustion chamber (11) and the afterburning chamber (13), vertical preheating channels (23, 24) arranged in the front boundary wall of the main combustion chamber, running to the side of the filling door (4), with air inlet openings arranged below the filling door and air outlet openings opening into the partition wall, are provided. Heating device according to claim 2, characterized in that below the filling door (4) there is provided a preheating chamber (25) adjacent to the main combustion chamber (11) and connected to the vertical preheating channels (23, 24) with an air inlet opening (27) adjustable by a slide (26). Heating device according to one of claims 1 to 3, characterized in that the partition wall (12) arranged between the main combustion chamber (11) and the afterburning chamber (13) has nozzle-shaped outlet openings (17) for the afterburning air in the upper region of its front side facing the rear wall of the device. Heating device according to one of the preceding claims, characterized in that the partition wall (12) provided between the main combustion chamber (11) and the post-combustion chamber (13) is designed as a hollow chamber wall that is thermally insulated from the post-combustion chamber,