DD294329A5 - BURNERS FOR BURNING LIQUID FUELS - Google Patents

Abstract

The burner for the combustion of liquid fuels can be used as start-up or support burner for steam and Heiszwassererzeuger that are operated with solid fuels. The object of the invention is to develop a burner with which the Zuendstabilitaet is increased at the same time, the amount of Zerstaeubermedium is significantly lowered and the control range is greatly expanded. The features essential to the invention are characterized in that the steam-fuel nozzles 8 have steam inlet openings 10 which are at least opposite the circumference, are arranged uniformly around the circumference and are perpendicular to the axis of the steam-fuel duct 8. By means of burner is reached {burner; Ignition and support burner; Oelbrenner; start-up burner; ignition stability; fuel atomization; Burner head; atomizing}

Description

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Field of application of the invention

The invention is applicable in all energy systems in which heating oil is used for steam or heat generation. In particular, the oil burner is suitable as start-up or support burner for steam and hot water generators, which are operated with solid fuels.

Characteristic of the known state of the art The oil burners used as start-up and support burners for boilers with dust firing have a number of disadvantages:

- The quality of combustion depends on the mixing of the reactants, which is determined by the supply pressure of the oil, the air or the steam. Pressure changes worsen the quality of the combustion.

- The control range of known burners ranges from 100 to 70% load.

- The combustion efficiency, especially when starting up boilers from the cold state is 80%.

- The amount of Zerstäubermedium is very high with over 0.25kg steam / kg of oil.

The gas-dynamic burner, type WKZ (patent PL 263904 of 30 1.87), based on the atomization of a partial amount of oil with Steam, which is guided as a gas mixture in the main fuel stream vird. The effectiveness of oil combustion at start-up and Support operation was thus significantly improved. The operating experience in Polish power plants is positive. Other burner designs such as DD-PS 239253 are due to different applications (glass furnaces) after

built there technological requirements.

Burners such as EP 0160769 oriented to the improvement of individual effects such. B. a cheaper fuel gasification

by means of high turbulence.

It is therefore necessary an oil burner, which in extreme operating conditions (cold combustion chamber) a fast and stable Ignition achieved, a complete combustion ensures, reliable and in a wide range is regulatable. Object of the invention

The aim of the invention is to design an oil burner, which improves the ignition stability even with poorer oil qualities, intensifies the fuel atomization in the upstream fuel nozzle and simplifies the production of the feed ring.

Essence of the invention The invention relates to a burner for the combustion of liquid fuels, mainly in energy boiler systems. Characteristic of the known prior art is the burner according to the patent PL 263904, from the burner lance, the Burner head and an intermediate intermediate ring exists. The intermediate ring has an annular Fuel chamber and intake nozzles lying axiai in front of the steam-fuel nozzles. Between the outlet of the suction nozzle

and the inlet of the steam-fuel nozzle is an annular gap, is sucked from the. The burner head has atomizer and vapor fuel nozzles.

The object of the invention is, in further technical simplification and reduction of the manufacturing cost of the burner and

when using inferior oil qualities than before, to improve the overall ignition stability significantly and reduce the consumption of Zorstäubermedium economically measurable.

Jine cheapening the Bronner construction is usually always with a reduction or limitation of Use properties associated. The previously achieved cheapening takes into account that

- Pressure changes worsen the quality of combustion,

- The amount consumption of Zerstäubermedium very high liagt (0.25kg steam / kg oil) and

- the combustion efficiency in the cold start is 80%.

The invention succeeds in achieving a surprisingly high economic advantage with details known per se. According to the invention, a significantly higher Bronnstoffzerstäubung is achieved with a new intermediate ring and new steam-fuel nozzles.

The intermediate ring has radial-axial bores through which the liquid fuel from the central fuel supply channel of the steam-fuel nozzle is supplied. The steam chamber of the head has a favorable, annular shape, in which protrude the steam-fuel nozzles. The vapor from the chamber is passed through radial bores in the steam-fuel nozzle, while axially flows from the intermediate ring of the fuel. The axial bore in the intermediate ring is in axis to the axial bore of the steam-fuel nozzle. The correct position of the head in the intermediate ring secures a dowel. The connection lance, intermediate ring and burner head is made by a compression nut. The features essential to the invention (see Figure 1) are characterized in that the steam-fuel nozzles 8 have steam inlet openings 10 which are at least opposite to the circumference and these steam inlet openings 10 perpendicular to the axis of the steam-fuel nozzle 8 and evenly on the circumference of Steam fuel nozzle 8 are arranged. Secure dowel 17 and 16 press nut that burner head 5 and intermediate ring 11 are connected to the burner lance and thus are fixed correctly to each other locally.

The constructive simplicity of the burner design nevertheless makes it possible to achieve a high level of technical progress, which is documented in the following:

better atomization of the partial fuel quantity by vertical meeting of the fuel and steam steel,

Use of higher viscosity fuel,

- simple and cheap production of the structural parts.

embodiment The invention will be explained in more detail with reference to an embodiment shown in FIG. The burner consists of the lance 1 with the end piece 2, which steam supply channels 3 and the fuel central channel. 4

has.

The burner head 5 has steam-fuel nozzles 8 and Brennstoffzerstäuberdüsen 7 and an annular Steam chamber 6. The lance end 2 of the lance 1 and the burner head 5 are pre-connected with a press nut 16. Each of the steam-fuel nozzles 8 has an axial bore 9 for the fuel-vapor mixture and radial, in 2 levels

superimposed, evenly distributed over the nozzle circumference bore 10 for the steam supply.

Between the burner head 5 and the lance end 2, an intermediate ring 11 is arranged, which holes 12 for steam and

has radial-axial bores 13 for the liquid fuel. The passage openings for the fuel have a radial 14 and axial 15 part, the latter being in axis to the steam-fuel nozzle 8.

The correct position of the intermediate ring 11 to the burner head 5 is taken over by dowel 17.

Claims (4)

1. Burner for the combustion of liquid fuels, wherein the burner head has fuel atomizing nozzles and steam-fuel nozzles and is located above the intermediate ring, characterized in that the steam-fuel nozzles (8) have steam inlet openings (10) on the circumference at least opposite. 2. Burner according to claim 1, characterized in that the steam inlet openings (10) are arranged perpendicular to the axis of the steam-fuel nozzle (8). 3. Burner according to claim 1 and 2, characterized in that the steam inlet openings (10) are arranged uniformly on the circumference of the steam-fuel nozzle (8). 4. Branner according to claim 1, characterized in that the burner head (5) and intermediate ring (11) by means of a compression nut (16) are connected to the burner lance and so the correct position of the burner head to the intermediate ring is fixed.