Method of and device to control fuel delivery into combustion chamber of gas-turbine plant

FIELD: gas-turbine plants.

SUBSTANCE: proposed method includes changing of fuel rate depending on power by metering out delivery of fuel into manifolds of coaxially installed pilot and main burners of burner assemblies with preliminary mixing of fuel and air. Burner assemblies are installed in two tiers, and fuel is delivered into burners of both tiers. At starting fuel is fed into manifold of pilot burners of outer tier and before idling, into manifold of pilot, burners of inner tier. At idling amount of fuel fed into pilot burners of outer and inner tiers is maintained equal. Then fuel delivery into pilot burners of outer and inner tiers is increased. Prior to operation under no-load conditions fuel is fed to main burners of outer and inner tiers. In the range from no-load to rated load, fuel delivery into main burners is increased with simultaneously decreasing relative portion of fuel fed through pilot burners. Invention provides reduction of content of nitrogen oxides NOxin exhaust gases of gas-turbine plant.

EFFECT: provision of stable burning of lean mixtures under any operating conditions.

4 cl, 2 dwg

 

The invention relates to combustion chambers of gas-turbine units (GTU), and in particular to methods of controlling the feed of fuel into the combustion chambers and devices for their implementation.

Known methods closest to the invention is a method of controlling the feed of fuel into the combustion chamber of the gas turbine, including the change of fuel consumption, depending on plant capacity by dispensing fuel in the reservoir duty and main burners burners with premixing of fuel and air [1].

The device for implementing this method comprises a burner with premixing of fuel and air, including the pilot and main burner, mounted coaxially to each other. Each burner is connected with the fuel reservoir connected by pipeline with the set of its input fuel metering.

Using the dosing fuel is supplied to the fuel reservoir duty and main burners. Pilot burners contain diffusion channel to launch and combustion stability of the combustion chamber on all modes of GTP [1].

A disadvantage of the known method and device is the high level of concentration of nitrogen oxides NOx in the exhaust gases of the gas turbine, due to the presence of the diffusion channel pilot burners.

Task invented the I is the reduction of harmful emissions of nitrogen oxides NOx in the exhaust gases of the gas turbine while ensuring stable combustion of the poor mixtures on all modes of plant operation.

This task is solved in that in the known method of regulating the supply of fuel into the combustion chamber of the gas turbine, including the change of fuel consumption, depending on its power by dispensing fuel in the reservoir duty and main burners burners with premixing of fuel and air, the fuel supply is carried out in two tiers of burners, and the run mode, the fuel is fed to the collector pilot burners outer layer, before entering the regime of small gas - in manifold pilot burners inner layer, at idling conditions support the same amount of fuel supplied to pilot burners outer and inner layers, then increase fuel flow to the pilot burners of the outer and inner layers, before entering the idle mode served fuel to the main burners of the outer and inner layers, and the range of modes from idle to rated increase fuel flow to the main burner, thus reducing the relative proportion of fuel supplied through the pilot burners.

This task is solved by the fact that in the known device for regulating the supply of fuel into the combustion chamber of the gas turbine, containing the burner with premixing of fuel and air, including the pilot and main burning and, mounted coaxially to each other, and each burner is connected with the fuel reservoir connected by pipeline with the set of its input fuel metering, the burner is installed in two layers, the device is equipped with an additional collector connected with on-duty burners inner layer and an additional pump, the inlet of which is connected to the pipeline connecting the collector of the pilot burners of the outer layer with its dispenser, while the collector of the fuel supply to the main burners connected additional pipeline with the main burners of the inner layer.

The proposed method of regulating the supply of fuel into the combustion chamber when using the proposed device allows you to burn a pre-prepared poorer mixture, resulting in reduced concentration of nitrogen oxides in the exhaust gases of the gas turbine engine.

This is due to the arrangement of burners in two tiers.

Consistent fuel flow to the pilot burners of the outer and inner layers provides an exit to the run mode and steady camera work on transient conditions. When connecting the main burners main modes, the NOx reduction is achieved by reducing the relative proportion of fuel supplied to pilot burners.

1 schematically shows the device for regulating the supply of fuel into the combustion chamber GTU,

figure 2 shows the dependence of the distribution of the fuel reservoir to the combustion chamber from the operation mode (power) GTU, where

figure 1 represents the relative fuel consumption, G1through the fuel manifold pilot burners of the outer layer from the total

figure 2 - relative fuel consumption, G2through additional collector pilot burners inner tier of the total,

figure 3 - relative fuel consumption, G3through a manifold main burner inner and outer layers

graph 4 - total relative fuel consumption, GΣ,

figure 5 - relative fuel consumption through fuel manifold pilot burners outer layer with a throw fuel at startup.

Device for regulating the supply of fuel into the combustion chamber of the gas turbine (figure 1) contains installed at the entrance to the combustion chamber 1 burner 2 with premixing of fuel and air. Burner device 2 includes the pilot and main burners 3 and 4 mounted coaxially.

The burner 2 is placed in two layers - outer 5 and 6. Pilot burners 3 of the outer layer 5 is connected with the fuel reservoir 7 is connected by pipe 8 with the fuel dispenser 9. Pilot burners 3 inner layer 6 is connected to the additional collector 10 associated with the optional fuel metering 11, the inlet of which is connected with the pipe 8. Main burner 4 of the outer layer 5 is connected with the fuel reservoir 12, the associated additional pipe 13 with the main burners 4 inner layer 6. The fuel manifold 12 of the pipe 14 is connected with the metering device 15 mounted parallel to the dispenser 9.

The method is as follows. When starting the gas turbine fuel into the combustion chamber 1 is fed by a metering device 9 through the pipe 8 and flows into the fuel reservoir 7 pilot burners 3 of the outer layer 5. Additional dispenser 11 and the spout 15 are closed. Before the release of GTP on the regime of small gas opens an additional dispenser 11 and the fuel comes in additional collector 10 pilot burners 3 inner layer 6. At idling conditions with the help of feeders 9 and 11 is kept close largest amount of fuel supplied to pilot burners 3 of the outer layer 5 and inner layer 6. A further increase in power turbines is done by increasing the fuel dispenser 9 in the reservoir 7 and 10 pilot burners 3 outer and inner tiers 5 and 6. Before entering the gas turbine to idle mode opens the spout 15 and the fuel enters the manifold 12 main burners 4 of the outer layer 5 and inner layer 6. The increase in power turbines from idle to rated is done by increasing p the villas fuel dispenser 15 in the fuel manifold 12 main burners 4 of the outer layer 5 and inner layer 6.

Regulation of fuel into the combustion chamber while reducing power of the gas turbine from nominal mode to a stop is made using pipettes 15, 11 and 9 in the reverse direct the course of GTU.

The use of additional metering device 11 connected with the dispenser 9, allows the latter to operate the device at transient conditions and to maintain the relative flow through the pilot burners 3 main modes (see figure 2). The dispenser 11 is switched to the run mode and provides an equal amount of expenditure through the pilot burners 3 outer and inner tiers 5 and 6.

Suitable number of burners in tiers to do the same, which simplifies the control flow of fuel into the combustion chamber due to the equality of the hydraulic resistance of the fuel reservoir and the burners in the tiers.

The fuel in the manifold pilot burners outdoor stage on the run mode throw fuel in a time less than 1 second, followed by exposure for 2...5 seconds of constant fuel consumption and further reduce 15-50% significantly improves the starting of the combustion chamber with a pre-treatment of the poor fuel-air mixture and increases the stability of GTU. This is achieved by a sharp rise and achieve favorable for starting excess fuel. The decrease in supplies is Yes fuel after ignition of the combustion chamber reduces the excess fuel, which raises the stability of operation of the gas turbine engine.

The invention allows to reduce the content of nitrogen oxides NOxin the exhaust gases of the gas turbine while ensuring stable combustion of the poor mixtures in all modes of operation.

Source of information:

[1] U.S. Patent No. 5450725, MKI F 23 R 3/30, publ. in 1995

1. The method of regulating the fuel supply to the combustion chamber of a gas turbine plant including the change of fuel consumption, depending on its power by dispensing fuel in the reservoir duty and main burners burners with premixing of fuel and air, wherein the fuel supply is carried out in two tiers of burners, and the run mode, the fuel is fed to the collector pilot burners outer layer, before entering the regime of small gas - in manifold pilot burners inner layer, on the regime of small gas support close to the value of the amount of fuel supplied to pilot burners outer and inner layers, then increase fuel flow to the pilot burners of the outer and inner layers, before entering the idle mode served fuel to the main burners of the outer and inner layers, and the range of modes from idle to rated increase fuel flow to the main burner, thus reducing the relative is Olu fuel supplied through the pilot burners.

2. The method of regulating the fuel supply to the combustion chamber of a gas turbine installation according to claim 1, characterized in that in the run mode, the fuel is fed to the collector pilot burners outer layer throw, followed by exposure for 2...5 with constant fuel and its further reduction to 15...50%.

3. Device for regulating the supply of fuel into the combustion chamber of a gas turbine plant comprising a burner with premixing of fuel and air, including the pilot and main burner, mounted coaxially to each other, and each burner is connected with the fuel reservoir connected by pipeline with the set of its input fuel metering, characterized in that the burner is installed in two layers, the device is equipped with an additional collector connected with on-duty burners inner layer and an additional pump, the inlet of which is connected to the pipeline connecting the collector of the pilot burners of the outer layer with its dispenser, while the collector of the fuel supply to the main burners connected more pipeline with the main burners of the inner layer.

4. Device for regulating the supply of fuel into the combustion chamber of a gas turbine installation according to claim 3, characterized in that chicagoreader devices in tiers in the same way.



 

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