DE1260068B - Liquid fuel burner - Google Patents

Description

Liquid fuel burners The invention relates to pot burners for liquid fuels with an inner and an outer jacket, both im Air supply openings are arranged inside as well as in the outer jacket and where on the outer surface of the inner jacket several upwardly open, truncated cone-shaped baffles are arranged one above the other, with the next higher baffle a smaller one Base diameter than the lower one.

A liquid fuel pot burner is known in which a feed line for the liquid fuel in the lower part of the pot leads, wherein the side wall has rows of air supply openings in a The distance is arranged vertically with regard to the air supply into the inside of the pot, the openings of one of the lower rows being tangential with respect to the vertical Pot axes are aligned to the gas that is in the lower part of the pot forms to impart a rotary movement, and in which devices are provided, around the mixture of air and oil vapor rising from the lower part of the pot, To supply air. However, so far it has not been possible to sustain the considerable Avoid difficulties arising from the precipitates of carbon in Form of soot and coke in these pots.

According to the invention these disadvantages are eliminated in that all Air supply openings of the inner jacket close to the attachment point of the guide plates are arranged.

This creates a pot burner with a high degree of efficiency works and does not need to be cleaned over a long period of operation.

The following is an exemplary embodiment of the invention described with reference to the drawing, in which a schematic cross section a room air heater with a pot burner according to the invention is shown.

The room air heater shown in the drawing has a burner pot 2, which is arranged concentrically in a cylindrical housing, so that a annular space between the outer jacket of the pot and the housing and a horizontal space is formed between the bottom of the pot and the bottom of the housing will. For the supply of a liquid hydrocarbon fuel is at the bottom Part of the pot is connected to a line 10.

A motor-driven fan creates a flow of air that passes through the Combustion chamber heat exchanger flows past and is in heat exchange with this and which is discharged through an outlet. By the drive motor of the fan a fan 12 is also driven, which gasification and combustion air through a line 11 and an inner jacket 1 open at the bottom into the spaces between the pot and housing presses. This air is both through openings in the inner jacket l as also passed through openings in the outer jacket of the pot 2 into the pot interior, as in of the drawing represented by arrows, the arrows on the outer surface of the Pot 2 indicate the inclination of the air supply openings.

In the lower part of the combustion chamber 6 is an upwardly widened one Flame distributor arranged concentrically on the inner jacket 1, the combustion gases distributed, which then emerge from the top of the burner pot 2. Inside the pot and at a distance from this flame distributor a row is flared upwards Baffles 3, 4 and 5 arranged on the inner jacket 1 at a distance from each other are attached.

The gasification and combustion air flows into the inside of the pot Openings in the outer jacket of the pot are fed in several rows on the outer jacket of the pot are attached, these rows spaced apart are, and also through openings in the inner jacket 1, which are also in superimposed Rows are arranged and denoted by 7, 8 and 9, each row of openings on the inner jacket in the vicinity of the connection of a baffle with the inner jacket is arranged.

Each of the baffles 3, 4 and 5 is attached to the inner jacket 1 in such a way that that the angle between the baffle and the pipe wall is approximately an angle between 40 ° and 45 ° corresponds. These baffles have different outside diameters lowest baffle 3 has the largest outer diameter and up to the baffles 4 and 5 have smaller outer diameters.

The openings in the outer jacket of the pot have, as already stated, a certain direction and inclination. So are the openings in the bottom two Rows tangential and directed downwards, the openings of the middle rows only tangential or tangential and directed upwards, and the openings of the upper Row are only inclined upwards.

The pot burner according to the invention works as follows: The from Combustion and gasification air supplied to the fan 12 is on its way through the conduit 11 passing through the combustion chamber 6 and in the inner jacket 1 preheated. The main part of this preheated air that is in an appropriate ratio to the fuel supplied through the line 10, flows through the bores in the outer jacket into the inside of the pot. The preheated air promotes the gasification of the Fuel that continues by utilizing the combustion in the upper Part of the pot 2 and the combustion chamber 6 supported radiant heat generated will.

The temperature of this gasified fuel-air mixture is located however still below the cracking temperature because the lower zone in the burner pot essentially shielded from the radiant heat from above by the baffles is. When the mixture swirls between the outer jacket and the baffle 3 upwards flows, tangentially preheated air is supplied through the openings in the outer jacket. The mixture with the additional air also flows upwards in eddies, whereby through the further air supply openings on the outer jacket and on the inner jacket more air is added. Because this fuel-air mixture on the outer circumference of the baffle 3 swirls past upwards, this mixture is increasingly exposed to radiant heat from above because the upper baffles have smaller diameters exhibit. The proportion of air in the mixture increases progressively, also increases the mixture temperature so that there is essentially complete hydroxylation of the fuel. When this hydroxylated fuel is added to the top of air flows into the combustion chamber 6 from the upper air supply openings, will be a burn with a minimum of carbon residue in the pot and in reached the combustion chamber.

As already stated, the baffles 3, 4 and 5 are used to To shield the gasification zone from the heat radiation and the mixture rising upwards to increasingly expose this radiant heat. They are also used in Cooperation with the openings 7, 8 and 9 on the inner jacket to do that quickly circling flow of the mixture to prevent it from moving in a radial direction flows inside and down along the circumference of the inner jacket. This would create a carbon precipitate on the wall of the inner jacket allow a much lower temperature than the mixture has.

Particularly favorable operating characteristics result when the rows the air supply openings on the outer jacket at a short distance below the outer edge the baffles are arranged.

The pot burner shown, about 33 cm in diameter, can be equipped with a relatively small carbon precipitates can be burned at a maximum throughput of over 11.31 fuel / hour and with a minimum throughput of less than 7.61 fuel / hour.

Claims (1)

Claim: Pot burner for liquid fuels with an inner and an outer jacket, with air supply openings being arranged in both the inner and the outer jacket and with several upwardly open, truncated cone-like baffles arranged one above the other on the outer surface of the inner jacket, the next higher baffle each having one has a smaller base diameter than the lower one, characterized in that all the air supply openings (7, 8, 9) of the inner jacket (1) are arranged just above the attachment point of the guide plates (3, 4, 5) on this inner jacket. Documents considered: Swiss Patent No. 333 848; French Patent No. 1093 145; British Patent No. 570,420; U.S. Patent Nos. 2,625,214, 2,560,367, 2483925.