Combustion – Fuel disperser installed in furnace – Spaced fuel dispersing orifices within furnace
Patent
1996-11-01
1999-12-21
Jones, Larry
Combustion
Fuel disperser installed in furnace
Spaced fuel dispersing orifices within furnace
431 1, 431159, 25112915, 25112905, 25112921, F23C 500
Patent
active
060041277
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to an oil burner for heating systems.
BACKGROUND OF THE INVENTION
Oil burners for heating systems conventionally comprise a combustion chamber into which fuel is continually fed via a nozzle.
Oil burners, particularly larger burners, are subject to resonance vibrations, the vibration behaviour of which in oil burners is caused by the combustion space and the nature of the air feed which together form a resonant body.
In the case of gas burners, operated at the resonant frequency, as is described for instance in WO 92/08928 or WO 82/00097, the causes of such vibrations are known and the thereby resulting disadvantages are combated by a variety of means.
Due to the inertia of the gas flowing into a feed pipe a vacuum materializes in the combustion chamber following combustion, as a result of which, on the one hand, gas and air are drawn in and, on the other, a return flow of hot combustion gases occurs which ignite the subsequent fuel mixture inflow. Accordingly, a cyclic process materializes which pulsates at a frequency which substantially depends on the dimensioning of the combustion chamber and feed pipe or feed conduit and the nature of the gas concerned.
Such pulsed operated burners may also create an enormous noise which is in the range of roughly 90 to 140 db(A). This is why in WO 92/08928 a system is provided which decouples the resonance system of the combustion chamber and fuel feed conduit acoustically from the downstream heat exchanger. The resonant frequency occuring in the case of these pulsed burners is of the order of a few 100 Hz and depends on the shape and size of the cavities formed by the combustion chamber and feed conduits.
In the case of gas burners an attempt is also made to prevent the occurence of resonance vibrations by means of damping cavities which are arranged around the gas feed conduit. One such arrangement is known, for example, from DE 33 24 805 A1.
As far as simple small oil burners are concerned which are suitable for operating the heating systems of small houses and should not in general be operated pulsed, resonance vibrations occuring may not only create a noise nuisance, but also result in the oil burner being ruined.
In addition to this, it is known that oil burners as compared to gas burners pose a greater emission problem, caused, on the one hand, by the constitutents contained in the fuel oil and, on the other, by a poorer atomization of occasionaly viscous oil in the combustion chamber so that it is difficult to achieve completely stoichiometric combustion. Also, the oil feed conduits for the continual oil feed tend to dribble which results in a poor combustion as regards emission pollution.
For internal combustion engines very many different kinds of fuel injection devices have been known for a long time. These fuel injection devices are, as a rule, configured as a pumped nozzle system. The pumps employed are solenoid-operated, in which the plunger of the pump is impacted by a solenoid-actuated armature. A variety of pumps having piezoelectric actuators is also known.
In DE-OS 23 07 435 a fuel injection device for internal combustion engines is described in which the pump working space is connected to the pressure space of at least one hydraulically actuatable spring-loaded injection valve by an electrically driven plunger pump and is in connection with a source of pressure via a feed valve. On commencement of the pumping action the plunger exercises a certain idle stroke as a result of which the mass of the plunger is accelerated prior to the actual pumping stroke and the stored kinetic energy is made use of to boost the pressure in the pump working space. For this purpose the injection device comprises as the plunger a soft iron armature which is driven by a linear motor over a relatively long distance.
Such injection devices operating on the energy-storage principle have subsequently been further developed, corresponding injection devices being known from DD-PS 120 514 and DD-PS 213 427. These fuel injection
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Ficht Reinhold
Heimberg Wolfgang
Hellmich Wolfram
Kogl Franz
Ficht GmbH & Co. KG
Jones Larry
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