DK176315B1 - Wood stove insert - Google Patents

Description

DK 176315 B1 i

The present invention relates to a wood stove insert wherein the insert comprises a grate for positioning above ground level fireplaces with a closed combustion chamber stove and which provides a rapid ignition of solid fuel, resulting in a reduction in the emission of polluting flue gas particles. Firewood ignition devices to ensure trouble-free solid fuel ignition by means of a grating device are known e.g. from US Patent 2004173205 and WO Patent 2004079266, but these writings are not intended to be used in incinerators with a closed combustion chamber and do not aim to provide a directional supply of combustion air, resulting in a reduction in the emission of pollutant flue gas particles.

In principle, ignition of solid fuel in stoves 20 is problematic because the conventional location of the air and ash burner grate at the bottom of the combustion chamber does not take into account an optimal supply of primary air to the combustion. Either because it is blocked by the solid fuel that is trying to ignite, or gives an unintended 25 large supply of primary combustion air if the fuel is placed inappropriately in relation to the grate. When blocking the supply of air, it will be difficult to ignite the fire due to deficits in the supply of primary combustion air, which means that the temperature in the 30 combustion chamber does not become high enough for the combustible flue gases in the fuel to be released and ignited (ignited).

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Excessive supply of primary combustion air will cause an accidental cooling of the fuel and the combustion chamber, which prevents over-combustion of the fuel due to cooling and fire of flames from the fuel.

Due to the aforementioned issues, it is often necessary to add additional ignition media, e.g. newspapers, ignition blocks or ignition fluid, several times 10 during the ignition procedure before the heat generation from the fuel is sufficiently large for the combustible flue gases to be released in amounts that trigger an over-ignition of the fuel and the combustion proceeds autonomously, without the addition of ignition media.

15 During the period from the start of the ignition test, until the combustion of the fuel takes place, the combustion takes place incompletely and as a result, a polluting soothing flue gas containing harmful particles, including PAH-20 compounds, tar substances and dioxin.

The object of the present invention is to provide an insert for a stove which can ensure rapid ignition of the fuel following an ignition procedure and which alleviates the above ignition and pollution problems. This is done by placing the stove for the stove on top of the ash grate in the combustion chamber, after which the fuel which is desired to be ignited is placed on the grate of the stove. After ignition of an ignition medium beneath the fuel, the stove insert provides a directional and free supply of combustion air to the fuel and ensures that the flames emitted by the ignition medium cover the fuel surfaces according to a predetermined flow pattern.

Hereby, the heat energy which is triggered by the ignition medium is concentrated and provides a forced heating of the fuel and the furnace room with the resulting over-burning of the fuel. When combustion of the fuel occurs, the combustion proceeds autonomously and at such a high temperature that the emission of contaminated flux flue gas particles is eliminated or substantially reduced.

The invention consists of an insert for a wood-burning stove, in which the insert comprises, in addition to a grate, a horizontal bottom plate whose upper side is connected to three vertical rectangular in 5-plate horizontal lower edges and wherein the two plates are substantially parallel to a distance corresponding to the third plate. and wherein the three vertical plates are connected substantially in the vertical plate units and wherein a substantially horizontal shaking device is connected to the 2 parallel plates and placed above the level of the horizontal base plate such that a cavity is present between the base plate and the shaker and where there are ventilation openings in the plates positioned above the shaker and wherein the middle vertical plate has at least one substantially horizontal top plate and a vertical spacer arrangement towards the center of the insert.

The combustion ignition device is formed in its entirety 30 so that the supply of heat energy from the ignition medium and combustion air is directional. This makes it possible to ignite the fuel, which causes a rapid heating of the fuel surfaces and furnace space, resulting in a rapid development of combustible flue gases.

According to the invention, a location of the fuel on the grating device provides a free flow of heat energy from the ignition medium and primary combustion air via the fuel cavity. The base plate is configured to screen for free flow of cooling primary air on the sides of the fuel and, under the influence of thermodynamic conditions in the combustion chamber, forces heated air / flue gas toward the cavity which accelerates the heating of the fuel. The ventilation holes shown on the vertical side plates are designed to provide the supply of heated secondary air to the fuel from the furnace room, which accelerates the heating of the fuel. The rear vertical side plate spacer device is designed to provide that the heat energy emitted from the ignition medium coats a relatively large surface of the fuel at high speed. The baffle is designed to ensure that the heat energy emitted from the ignition medium is directed towards and ignites the fuel located high in the combustion chamber. There is a cavity between the base plate and the shaker in which the ignition medium 30 is placed.

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List of Figures

Figure: stove insert insert illustrative details reference number 5 1. bottom plate 2. rectangular plates 3. ventilation openings in the plates 4. horizontal baffle 5. spacing device 6. grating device 7. cavity between the bottom plate and grating device insert for a stove, the insert comprising a grate, 15 is a horizontal bottom plate (1), the upper side of which is connected to the horizontal lower edges of three vertical rectangular plates (2) and wherein the two plates are substantially parallel to one spacing corresponding to the extent of the third plate and where the three vertical plates 20 are connected substantially in the vertical plate units and wherein a substantially horizontal shaking arrangement (6) is connected to the two parallel plates (2) and located above the level of the horizontal base plate (1) such that a cavity (7) is present between the bottom plate and the shaker and where there are ventilation openings (3) in the plates (2) located above the shaker (6) and wherein said intermediate vertical plate has at least one substantially horizontal guide plate (4) above and a vertical spacer means toward the center of said insert.

Claims (1)

DK 176315 B1 6 1st insert for a wood stove, the insert comprising a grate for placing firewood above the substrate level characterized by further comprising a horizontal bottom plate (1) whose upper side is connected to three vertical rectangular 10 plate (2) horizontal lower edges and wherein the two plates are substantially parallel to a spacing corresponding to the horizontal extent of the third plate and wherein the three vertical plates are connected substantially in the vertical plate units and wherein a substantially horizontal shaking device (6) is connected to the two parallel plates (2) and located above the level of the horizontal base plate (1) such that a cavity (7) is present between the base plate and the grating device and where there are ventilation openings (3) in the plates (2) located above the grating device (6). ) and wherein the intermediate vertical plate has at least one substantially horizontal guide pad (4) at the top as well as a vertical spacer (5) ) facing towards the center of the insert. 25