AT501208B1 - STORAGE OVEN WITH TRAY STONES - Google Patents

Description

2 AT 501 208 B1

The invention relates to a storage furnace according to the preamble of claim 1.

The Grundofen (storage oven) has a - therefore the name - relatively low-lying firebox and was previously intended for a wood fire without rust. As a main feature formed behind the firebox firebox formed from ceramic material, which are permanently installed together with the whole furnace, which conduct the heating gases to the chimney and give the heat absorbed to the furnace outer walls, which store the heat and turn as radiant heat to the room. It is particularly suitable for long-flammable fuels, and its radiation and convection heat is in the lower temperature range.

The Zugquerschnitt behind the furnace is in conventional storage furnaces 2/3 to 3/3 and tapers towards the stovepipe to 1/3. Jump-like extensions and constrictions are to be avoided. When changing direction, round edges and corners.

The train length in the tiled stove should not be chosen arbitrarily, it is measured from the firebox to the chimney entrance.

Tensile cross-sections and tensile lengths are to be dimensioned so that they are matched to the Heizleistungs-Ofengröße, the exhaust gas mass flow, the discharge pressure of the chimney, the necessary heat extraction from the hot gases and the prevention of condensate at the chimney.

The said draft cross section calculation has long been state of the art and is described e.g. also applied to the computer-aided calculation program developed by the Heiztechnische Versuchs- und Forschungsanstalt. For example, e.g. with a heating power of 3.7 kW, reduce from 630 cm2 burn-up cross-section to the stovepipe to a cross-section of 256 cm2.

In the construction of known storage ovens, a furnace skeleton is erected, into which then the heating insert with the combustion chamber, the storage tank and the flue gas ducts are installed. These flues are built according to the tiled stove calculation with ceramic material (chamotte tiles). The disadvantage here is that a relatively long time is needed for the construction site and the storage furnace may be fired only in the range between full load and half load.

In DE 355 884 a storage furnace is described with Zugsteinen, which are superimposed, being made by a provided on the top opening a connection with the respective overhead Zugformstein. Apart from the lack of frontal openings that prevent a functionally juxtaposing the Zugsteine in a plane or in the longitudinal direction, the cross-section is indeed provided with a vault-like curve, but this does not widen conically downwards but remains substantially constant over the entire height wide.

Furthermore, in DE 34 40 700 A1 are described conglomerates for the establishment of a system of flue gas ducts, but these are so strung together that constantly successive cross-sectional constrictions and extensions arise, the inner channel along the flue gas path undergoes a constant change in cross section, which do in a flue should be avoided (as seen for example in FIG. 5 of this document). But it is also provided no guidance of the combustion gases along the tunnel cross-sectional longitudinal axis.

The object of the invention is to provide a storage oven of the type mentioned, which can be easily and quickly moved, and thus can be constructed inexpensively. 3 AT 501 208 B1

This is achieved by the features of the characterizing part of claim 1 according to the invention. Usually this is taken into account by a continuous reduction of the Rauchgaszugquerschnittes with increasing distance from the combustion chamber. By contrast, in the case of the invention, a cross-section which is constant over the entire length of the flue gas duct is provided, which is realized by means of modular identical draft blocks.

The cross section used in the storage furnace provided according to the invention can accommodate both the full initial flow and the reduced final flow of the flue gases so that the best possible heat transfer to the shaped brick is made possible. While after the combustion chamber, the flue gas stream spreads to the full cross-section, it flows in the end region of the flue only in the uppermost curved area with the conical course resulting reduced clear width, which can now continue to transmit its heat in this with a high efficiency , because the conically reduced tension cross section allows this.

In the train system of the storage furnace according to the invention with conical upwards, e.g. Trapezoidal, conical or tunnel-like Gewölbezugquerschnitt, results in a self-variable hydraulic diameter, which allows it without the expense of a previous Zugquerschnittsberechnung to exactly match the actual flow resistance and the existing differential pressure. Therefore, the storage furnace according to the invention can be optimally fired even with a partial load of well below 50%.

All ventilation calculations are based on round channel cross sections. In the tunnel-like channel cross sections according to the invention, the existing hydraulically equivalent diameter is used.

The flow resistance within the channel cross-section is significantly dependent on the flow velocity and thus also on the heating gas temperature. Due to the self-variable tension system with the conical channel cross-section, the fluidic matching of the channel resistances is possible.

The air or fuel gas always takes the path of least resistance. For this reason, it is necessary to match the air ducts (flow resistances) so that the planned volume of air can also flow through the intended air duct and the planned heat output at the intended location can also be effective.

Basically, the rising hot hot gases flow in the upper part of the hot gas flues through the line with the lowest flow resistance. Since the volume flows divide accordingly, the uniform flow resistance at different flow velocities is absolutely established in the running path.

The invention will be described in more detail with reference to the accompanying drawings. It shows

Fig. 1 a Zugmodulsystem an embodiment of the storage oven according to the invention in plan view;

2 shows a section through an exploded view of the tension module system of a further embodiment of the storage oven according to the invention;

Fig. 3 is a three-dimensional representation of the Zugmodulsystems another embodiment of the storage furnace according to the invention and

FIG. 4 shows a three-dimensional representation of a tension molding block of the storage furnace according to the invention according to FIG. 2.

Claims (4)

4 AT 501 208 B1 Numeral 1: Tension stones are made of refractory material, wherein they are preferably made of chamotte or chamotte casting materials, refractory concrete, magnesite, metal or cast iron. Numeral 2: Conical upwards conical draw, where the rising hot combustion gases escape and always flow through the hydraulic channel cross sections in the upper region of the Zugformsteins 1. As a result, the optimal Heizgasführung takes place. Reference numeral 3: Hydraulic diameter approx. 100 cm2 Reference 4: Hydraulic diameter approx. 570 cm2 Claims: 1. Storage furnace with a combustion chamber and at these subsequent Heizgaszügen which Heizgaszüge at least partially from prefabricated, modular Zugformsteinen with a vault-like inner channel cross-section, at its the vaulted inner side region opposite underside open and closed at its longitudinal sides, are composed, characterized in that the modular tensile bricks closed with the vault-like inner channel cross section at its top and open at their longitudinal end faces, so that the modular tensile bricks with arched inner cross section with their open longitudinal end faces to a Heizgaszug aneinandersetzbar are, resulting in a continuous channel with a constant longitudinal cross-section, and that between the opposing Innenkanalwandere hen measured clear opening width of the vault-like inner channel cross section, starting from the curved inner side region to the open bottom conically enlarged, with the clear opening width of the vault-like inner channel cross-section from the curved inner side area starting approximately up to the open bottom increased approximately to three times (Fig. 2). 2. Storage furnace according to claim 1, characterized in that the modular tensile bricks with a vault-like inner cross section have a trapezoidal, truncated cone-shaped or tunnel-shaped inner channel cross-section. 3. Storage oven according to one of claims 1 or 2, characterized in that the longitudinal sides extend at a right angle to the top and are each formed of a side wall having a substantially constant wall thickness, and that the vault-like inner channel cross-section is bounded by an inner channel wall , which has a substantially constant wall thickness, wherein the side walls and the inner channel walls within the Zugsteins are at least partially spaced apart from each other so that they form empty chambers between them. Hiezu 4 sheets drawings