Low emissions from combustion devices are obtained by burning a lean mixture of fuel and air obtained by pre-mixing gaseous fuel and air. Dry Low NOx (DLN) technology gas turbines, for example, typically burn natural gas under lean, pre-mixed conditions. Liquid fuels, by contrast, are typically burned by injecting a fuel spray directly into the combustor. This results in a diffusion flame in which the fuel is burned in a locally stoichiometric fuel/air mixture and causes high emissions. Under certain conditions, burning a liquid fuel is more desirable than burning a gaseous fuel. However, it would be desirable to avoid the high emissions associated with diffusion flames when burning such liquid fuels.
A method and apparatus for conditioning liquid fuels at a location external to a combustion device so that the resulting vapor phase fuel may be pre-mixed with air and burned under lean conditions, thus achieving low emissions, is described herein. Preferably, the liquid fuel is conditioned such that it may be used in a combustor configured for natural gas without modification to the combustor/fuel metering system. In one embodiment, the liquid fuel is sprayed into a vaporization chamber such that the spray does not impinge on any surface. The energy for vaporization is supplied through the injection of a hot diluent such as nitrogen or oxygen depleted air. Additional heat is added through the surface of the chamber to prevent heat loss and to maintain an internal surface temperature above the boiling point of the least volatile component of the liquid. The diluent gas also serves to control the dew point of the resultant vapor phase mixture. Additional heating to augment the vaporization process in the event that the diluent flow or temperature fall below the minimum levels needed for complete vaporization is supplied by internal heaters.
In another embodiment, the liquid fuel is sprayed onto a hot surface using a geometry such that the entire spray is intercepted by the surface. Heat is added through the surface to maintain an internal surface temperature above the boiling point of the least volatile component of the liquid fuel. The liquid droplets impinging on the surface are thus flash vaporized such that there is no build up of bulk liquid or a liquid film in the vaporizer. A carrier gas, such as nitrogen or air, may also be flowed through the vaporizer to control the dew point of the resultant vapor phase mixture. In some embodiments, a fuel nozzle is mounted at one end (the enclosed end) of a cylindrical chamber. The nozzle forms a hollow cone type spray with a spray angle chosen such that all of the spray impinges on the cylinder surface (in other embodiments a solid cone type spray nozzle is used). The preferred orientation is vertical, with the spray downward, so that the impingement of the spray on the walls is even. Two or more such chambers can be joined to a common manifold to accommodate higher capacities.
The features and advantages of the present invention will become more apparent from the detailed description set forth below when taken in conjunction with the drawings in which like reference numbers indicate identical or functionally similar elements.
Various embodiments of methods and apparatuses for conditioning liquid fuels are discussed below. Specific details are set forth in order to provide a thorough understanding of the present invention. The specific embodiments described below should not be understood to limit the invention. Additionally, for ease of understanding, certain method steps are delineated as separate steps. These steps should not be understood as necessarily distinct or order-dependent in their performance unless so indicated.
The complete disclosure of U.S. patent application Ser. No. 10/682,408, which was filed Oct. 10, 2003 (now U.S. Pat. No. 7,089,745), and which describes methods and devices for vaporizing, mixing, and delivering liquid fuels or liquefied gases which have been pre-vaporized with a reduced oxygen content air stream for use in combustion devices, is fully incorporated herein by reference. In addition, U.S. Patent Application Ser. No. 60/535,716, filed Jan. 12, 2004, and Ser. No. 11/033,180, filed Jan. 12, 2005 (now U.S. Pat. No. 7,435,080), which disclose systems and methods for flame stabilization and control, are both also fully incorporated herein by reference.
In some embodiments of a method and apparatus for conditioning liquids, such as hydrocarbon fuels, the liquid is sprayed into a chamber such that the spray does not impinge on any surface. The energy for vaporization is supplied through the injection of a hot diluent such as nitrogen or oxygen depleted air. Additional heat is added through the surface to prevent heat loss and to maintain an internal surface temperature above the boiling point of the least volatile component of the liquid. The diluent gas also serves to control the dew point of the resultant vapor phase mixture. Additional heating to augment the vaporization process in the event that the diluent flow or temperature fall below the minimum levels needed for complete vaporization is supplied by internal heaters. One application of the invention is the vaporization of liquid fuels, such as kerosene and heating oil, for introduction into a combustion device, such as a gas turbine. Pre-vaporizing the fuel in this manner allows the operation of the gas turbine in the lean, premixed mode, resulting in extremely low pollutant emissions.
In some embodiments, the sidewall and/or end wall of the chamber 110 are heated. In some embodiments, heating tape or heat tracing (MI cable) (not shown in
In the embodiment of
In alternative embodiments, the diluent gas is introduced into the chamber 110 through nozzles arranged on the sidewall of the chamber 110 and positioned, for example, between the nozzles 120 and or on one of the end walls of the chamber 110. Depending on the location and method in which the diluent gas is introduced into the chamber 110, the diluent gas may be introduced in a co-flow arrangement, a counter-flow arrangement, and/or at various angles in order to, for example, induce a swirling flow inside the chamber 110.
Referring now back to
The spool section 180 also includes one or more exit ports 182, similar to those of the chamber 110, through which vaporized liquid may exit the spool section 182. A drain 186 passes through the end cap 184 of the spool section 180 to allow any unvaporized liquids to be removed from the conditioner 100.
The spool section 180 may include a particulate collection device (not shown in
In some embodiments, a preheater (not shown in
It should be understood that the number of nozzles 120, the length of the chamber 110 and the spool section 180 can be modified to suit desired operating conditions (e.g., volume of fuel needed, type of liquid fuel to be conditioned, etc.). Thus, the design illustrated in
In the embodiments discussed above in connection with
The resulting spray from the nozzle 210 impinges on the interior cylindrical surface 240 of the vaporizer 200, and is evaporated due to heat input through the surface and from the hot carrier gas. As shown in the cross sectional view 500 of
As discussed above, a preheater is used to preheat the liquid fuel prior to entry into the chamber of the vaporizer in some embodiments. An example is shown in
Several embodiments of fuel conditioning devices have been discussed above. Numerous other modifications and variations of the present invention are possible in light of the above teachings. It is therefore to be understood that within the scope of the appended claims, the invention may be practiced otherwise than as specifically described herein.
This application is a Continuation of U.S. patent application Ser. No. 11/296,426, filed Dec. 8, 2005, which claims priority from U.S. Provisional Patent Application No. 60/634,221 filed Dec. 8, 2004. All of the foregoing are incorporated by reference in their entireties.
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20140199642 A1 | Jul 2014 | US |
Number | Date | Country | |
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Number | Date | Country | |
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Parent | 11296426 | Dec 2005 | US |
Child | 14213356 | US |