DD301338A7 - OIL BURNER WITH WATER VAPOR REMOVAL - Google Patents

Abstract

The invention relates to an oil burner with steam atomization. The invention has for its object to primarily ignite oil in burners by the addition of superheated steam itself. This is inventively achieved in that the nozzle body is formed as a cross-section to the jacket cross-extension return cone and the jacket tube is enveloped by a return chamber forming a vapor chamber. figure

Description

For this 1 page drawing

Field of application of the invention

The invention relates to an oil burner with steam atomization in a steam boiler of a thermal power plant.

Characteristic of the known state of the art

Oil burners with steam atomization have a multiplicity of very different nozzle head designs, which aim at the finest possible distribution and division of the oil droplets.

They have a tube which connects a fuel inlet with a spray nozzle, and a second tube which connects a Dampfeinlafl with the spray nozzle, wherein the tubes are arranged coaxially to each other (DD-PS 249612, DD-PS 207964).

The mixing of the media may only take place in the atomizer nozzle, since malfunctions may occur when steam enters the fuel channel.

The complicated nozzle designs pollute quickly, especially in an operation without oil filter. In addition, the operability is decisively negatively affected by wear of the dimensionally stable channels. For all oil burners a spark ignition energy or a Zündinitial is required, whereby the ignition safety decreases for the subsequent combustion.

Since an entry of "finely atomised oil into the combustion chamber occurs during the ignition process, it is due to

unburned oil deposits an explosive hazard. When using high viscosity oil, an oil preheating is required outside the oil burner, which takes place with the supply of larger amounts of energy in order to achieve a high degree of atomization.

Also known is an arrangement for igniting oil and gas burners by the use of superheated steam. The superheated steam is added in or at the burner mouth and causes a viscosity jump of the oil, whereby an ignition of the mixture is achieved.

The amount of hot steam is very high, especially at high oil throughputs. The large hot steam rate has a strong inerting effect.

Object of the invention

The aim of the invention is to safely and easily ignite oils with high viscosity and to ensure a stable burner operation.

-2- 301338 Presentation of the Essence of the Invention

The invention is based on the problem of mainly igniting oil in burners by the addition of hot water. This is inventively achieved in that the nozzle body is formed as a cross-sectional extension of the jacket tube return cone and the jacket tube is enveloped by a return chamber forming a vapor chamber. The return cone protrudes from the Brennormund, is cross-sectional widening arranged to the jacket tube and has hot steam channels. The mass-laden return cone bowed a viscosity jump by its heating by means of superheated steam. By surviving the return cone from the burner mouth creates a reverse vortex as a ring vortex, which forms öicht around the return cone. These vortices contribute significantly to the heating of the return cone, whereby a reliable ignition of the oil is achieved in the starting operation (oil atomization in the microparticle area, sudden evaporation, auto-ignition).

Ausführungsbolsplel

Reference to an embodiment, the invention will be explained in more detail below. It shows the

Fig .: the oil burner irii cut.

The burner 1 consists of an oil jacket tube 2, which is bounded by the steam chamber 3 and the central steam pipe 4, and

the Düsendrallring 5 and return cone 6. The Düsendrallring 5 has the swirl body 7 and 8 Intensivheizschräge.

The distance of the swirl body 7 and the oil outlet surface 9 is between 1.5 to 3mnl "d" of the diameter of the Rücksprjngkegels6.

The return cone 6 has a central bore 10 with the paragraph 11 = tuf and circumferentially uniformly distributed holes 12, which open directly in front of the oil outlet surface 9.

The return cone 6 has the cone 13, which forms the conical annular channel 14 in cooperation with the Intensivheizschräge 8. Between the oil outlet surface 9 and swirl body 7, the annular chamber 15 and between the steam outlet 16 and Rücksprungkegelbegrenzung the ring vertebra 17th

The pipe connections of the burner 1 are in the swirl vapor control valve 18, the core steam valve 19, the oil control valve 20 and the oil purging device 21st

operation

Before putting the oil burner into operation, thoroughly preheat the nozzle head. The steam valves 18, 19 are opened. The swirl steam 22 and the core steam 23 heat the oil jacket tube 2 including the burner head, in particular the nozzle swirl ring 5, with a relatively large mass of steel. After reaching the temperature θΤ at the burner head (temperature sensor 24) a small Anfahrölmenge 25 is passed into the preheating chamber 2 by opening the valve 20. The amount of oil 25 flows through the burner 1 and exits via the conical annular channel 14 from the oil outlet surface 9 as a veil oil of the return cone 6. By the pulse steam 26 of the holes 12, the amount of oil 25 passes into the hot gas stream 27 of the swirl vapor 22. On the hot wall 8 and on the end face 28 of the Düsondrallringes 5 an amount of oil is evaporated. The annular zone 15 is filled with the evaporation product 29. The oil is vaporized and atomized by contact with the hot gas stream and ignited without much external energy input.

In cooperation with the hot walls 8,28 and the conical surface 30 and the hot gas 27, the constant ignition of the oil 25 is maintained. After ignition, the amount of oil 25 is increased so 'until the required heat output of the oil burner is reached. To adjust the flame, the swirl vapor 23 is largely throttled or closed. The burner 1 has no mechanical adjusting elements. Over the slot area 9 (exchangeable return cone 6), the basic setting of the P ^r enneis as a power burner, pilot burner or supporting burner.

Advantages of the invention

stable burner operation,

low ignition energy,

- elimination of contamination by ciampfseitiges blowing the burner head,

- intensive oil preheating within the burner lance.

Claims (9)

1. Oil burner with water vapor atomization, wherein in the burner, a central tube with steam connection and a jacket tube with fuel connection are arranged, which are integrated in a nozzle body having burner mouth, characterized in that the nozzle body as the jacket tube (2) querschnittserweiternder return cone (6) and the jacket tube (2) is enveloped by a vapor chamber (3) forming a return step. 2. Oil burner according to claim 1, characterized in that the return cone (6) is arranged outstandingly from the Brennermünd. 3. Oil burner according to claim 1 and 2, characterized in that the return cone (6) has hot steam channels. 4. Oil burner according to claim 3, characterized in that the hot steam duct is formed as a central bore (10). 5. Oil burner according to claim 3, characterized in that the hot steam ducts (12) are arranged distributed angularly and uniformly on the circumference of the return cone (6). 6. Oil burner according to claim 5, characterized in that the hot steam channels (12) are arranged at an angle to the outlet of the oil jacket tube (2). 7. Oil burner according to claim 5, characterized in that the outlet of the oil jacket tube (2) adapted in the burner mouth to the querschnittserweiternden return cone (6) and tapered. 8. Oil burner according to claim 5, 6 and 7, characterized in that the hot steam ducts and the oil jacket pipe (2) open into an annular chamber (15). 9. Oil burner according to claim 1, characterized in that the steam chamber (3) swirl body (7).