Gas combustion apparatus and method for controlling the same
OwnerEnrico Sebastianiinventor
Life of this patent
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Abstract
The apparatus consists basically of an atmospheric burner, a combustion chamber, and means for creating a vacuum within the combustion chamber. To provide optimum combustion using different gases from one gas family, means for detecting at least one apparatus temperature and means for controlling the primary air flow according to the temperature detected are provided. Various applications are described wherein the temperature is measured at the surface of a burner diffuser and the primary air is controlled to keep the temperature below a critical value and the flame stable. For improved operation at the ignition stage, the flow rate of the primary air is set at a comparatively low predetermined starting value.
Claims18
A method for controlling air being supplied to a gas combustion apparatus having an atmospheric burner comprising:
- a) introducing fuel gas in a class of fuel gases and a stream of primary air into a suction duct of a burner to form a fuel-gas air mixture;
- b) introducing said mixture into a diffuser associated with said burner and forming a flame region above a surface of said burner in a combustion chamber of said combustion apparatus, said primary air being introduced into the suction duct in an amount responsive to at least one temperature detected at or within the flame region of said burner, and in steady-state operation, said amount of primary air varying between a value substantially equal to the amount required for stoichiometric combustion of the fuel gas and a value largely exceeding said amount required for stoichiometric combustion of the fuel as;
- setting the burner to provide optimum combustion of said fuel gas, said optimum combustion corresponding to a desired temperature at or within said flame region of said burner;
- and
- varying said amount of primary air admixed with said fuel gas to change the ratio of primary air fuel gas to cause said detected temperature to approach said desired temperature.
A gas combustion apparatus comprising, a combustion chamber having:
- 1) a burner, said burner including:
- at least one gas outflow nozzle, a corresponding number of ducts with intake ports and at least one diffuser, said intake ports confronting respective ones of the nozzles for drawing in a flow of primary air, said at least one diffuser being in flow communication with at least one of said ducts and containing at least one outflow opening for a fuel gas/primary air mixture;
- 2) a temperature detecting means, said temperature detecting means including a first sensor which is located at a surface of said burner or at least within a flame region of said burner and downstream of said at least one outflow opening for detecting and generating a first temperature signal indicative of the temperature proximate to or at the surface of said at least one diffuser;
- 3) means for setting the burner to provide optimum combustion of a standard gas of a given family of gases, said optimum combustion corresponding to a desired temperature at the surface of said at least one diffuser;
- 4) means for varying said flow of primary air in said primary air-fuel gas mixture to change the ratio of primary air and fuel gas to cause said detected temperature to approach said desired temperature at said surface of said at least one diffuser, said flow varying means including means to control the mixture of said primary air with said fuel gas so that the amount of primary air, which, in steady-state operation of the burner, is allowed to vary from a value substantially equal to the amount required for stoichiometric combustion of the fuel gas up to a value exceeding that required for stoichiometric combustion;
- 5) an exhaust duct for venting gases of combustion;
- and
- 6) means for creating a vacuum within the combustion chamber with respect to the area of the nozzle(s).
Dependencies are inferred from the claim text.