Liquid heaters and vaporizers – Fluid fuel – Explosion
Patent
1992-01-17
1993-03-02
Favors, Edward G.
Liquid heaters and vaporizers
Fluid fuel
Explosion
431 1, F22B 3100
Patent
active
051899892
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a boiler containing a pulsatory burner which is mounted in the water space of a hot water boiler and comprises a combustion chamber with a neck provided as an air inlet, and a non-return valve controlling the air flow through the air inlet to the combustion chamber, said non-return valve having a seat concentric with the air inlet, wherein there is provided at least one air inlet opening, and a flat, relatively think circular valve ring which is elastically flexible and, in the closed position of the valve, engages the seat and keeps the air inlet opening closed but can be operated to an open position by depression in the combustion chamber.
DE-C-933 651 discloses a boiler comprising a pulsatory burner consisting of a combustion chamber with a neck provided as an air inlet and a non-return valve controlling the air flow through the air inlet to the combustion chamber.
SE-B-435 098 shows how the non-return valve can be constructed and how the air inlet can be provided in a pulsatory burner of the above-mentioned type. The valve seat then consists of a flared portion at one end of the neck, the other end thereof being connected to the combustion chamber. The neck bears a valve body in which the seat and the valve ring are provided, and in the neck a fuel injection nozzle having ignition electrodes is provided. It is noted that the neck has a considerable axial length, and the reason therefore is that the non-return valve shall be spaced from the combustion chamber to avoid contamination and formation of coke on the valve seat. Then, also the injection nozzle will be at a relatively large distance from the combustion chamber, which is favourable since as a consequence thereof it will be subjected to contamination and exposed to heat radiation from the combustion chamber to a smaller extent but, on the other hand, due to such a location of the nozzle a bad fuel distribution in the combustion chamber will be obtained.
The most serious disadvantage of the provision of a long neck as in the known embodiment is, however, that the air inlet represents a dead volume in the combustion chamber, i.e. a volume which is not necessary for the combustion proper. By the dead volume being large, the movement of the valve ring will not occur as quickly and distinctly as desired. The opening period for the non-return valve becomes relatively long, and when the non-return valve is open back flow of gas from the combustion chamber can occur through the air inlet, dust (soot) being transported up to the valve seat and the valve disk causing contamination thereon. When the non-return valve does not work distinctly, the function of the burner becomes unreliable.
The purpose of the invention is to eliminate or at least considerably reduce the said disadvantages by reducing the dead volume of the combustion chamber and locating the non-return valve closer to the combustion chamber.
According to the invention the pulsatory burner of the above-mentioned type for this purpose has obtained the characterizing features of claim 1.
By passing water which is drawn off from the water space of the boiler along the outside of the neck of the combustion chamber, said neck will be cooled. The oil which is ejected into the neck from the fuel injection nozzle then will be kept so cold in the neck, due to the cooling thereof, that the oil will not be vaporized on the wall of the air inlet with following formation of coke. The zone where the vaporization of the oil will take place has been moved down into the combustion chamber to the inside of the top of the combustion chamber where the formation of coke will not cause any trouble; existing coke is removed by vibration and/or burning. The dead volume which is reduced by the arrangement of a shorter neck makes possible a quick and distinct movement of the valve ring and a lower location of the fuel nozzle and thus a more favourable distribution of the fuel in the combustion chamber.
For further explanation of the invention embodiments thereof are described below reference bei
REFERENCES:
patent: 3252496 (1966-05-01), Haag
patent: 3267985 (1966-08-01), Kitchen
patent: 4488865 (1984-12-01), Davis
Lundberg Stefan
Nilsson Jan
Favors Edward G.
Pulsonex AB
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