The combustion chamber with the optimum number of nozzles

 

(57) Abstract:

The combustion chamber of a gas turbine engine with an optimum number of nozzles includes a housing, a heating pipe and the front of the device with the air swirler and nozzle supply of liquid or gaseous fuel. Front camera device made with the optimum number of nozzles - three pieces 100 cm2square transverse (middle) section of the flame tube. The invention allows to reduce the emission of nitrogen oxides with minimal underburning of fuel. 3 Il.

The invention relates to gas turbine engines and installations for various purposes and can be used in the aviation, transport, marine, locomotive and stationary power plants.

Known combustion chamber, comprising a housing, a heating pipe and the front of the device with the air swirler and nozzle supply of liquid or gaseous fuels, such as combustion chamber of aircraft gas turbine engine TV7-117 and others (see[1], booklet TV7-117S Turboprop Engine, Moscow, Aviation Publishing Hourse, 1993; [2] USSR Author's certificate N 308653, CL P 23 K 3/00, 1983).

Known also adopted for the prototype combustor, based on the principle of micro is kami supply of liquid or gaseous fuel, moreover, the number of nozzles is determined by the formula (see RF patent N 2094705 from 27.10.97).

For example, for engine TV7-117 recommended to install the nozzle 72, which leads to lower emissions of NOxin 2 times.

However, the number of nozzles is selected by patent N 2094705, does not take into account the change of the completeness of fuel combustion from the number of nozzles per unit cross-sectional area of the flame tube.

The present invention is to reduce emissions of nitrogen oxides at a minimum level of underburning of fuel, because the main requirement to heat the car is in need of fuel economy.

This task is achieved by the fact that "microfamilies" combustion chamber, comprising a housing, a heating pipe and the front of the device with the air swirler and nozzle supply of liquid or gaseous fuel, front camera device made with the optimum number of nozzles per unit cross-sectional area of the flame tube three nozzles 100 cm2square transverse (middle) section of the flame tube.

The proposed combustion chamber is different from the known, accepted as a prototype, the signs above, therefore, predlozheniy combustion is the sharp reduction of the number of nozzles in comparison with recommendations on patent N 2094705. For example, for engine TV7 - 117 optimum number of nozzles is 30 pieces instead of 72 pieces under the patent 2094705.

In Fig. 1, for example, presents the structural layout of the combustion chamber. It includes a housing 1, a heating pipe 2, the swirler air 3 and the nozzle supply of liquid or gaseous fuels 4. Transverse (middle) section of the flame tube is determined by the diameter of the heating pipe DWand the height of the flame tube HW.

In Fig. 2 shows variations of the form A location of the optimum number of nozzles: 3 pieces 100 cm2fuselage mid-section of the flame tube.

The combustion chamber is as follows.

Compressed in the compressor, the air enters into the cavity of the housing 1, from which it enters the flame tube 2 through the many cracks and holes and through the swirler air 3. Through a nozzle 4 into the combustion chamber is fed under the pressure of a liquid or gaseous fuel.

The combustion of hydrocarbon fuels in the combustion chamber to provide a high gas temperature at the exit is accompanied by the emission of nitrogen oxides.

In Fig. 3, the solid curve shows the ratio of emissions of NOx(NOx)optand with a dotted line relationship underburning knogo section of the flame tube,

where is the combustion fuel Nf- the number of the nozzles;

FWsectional (middle) section of the flame tube, cm2;

(NOx)opt- emissions of NOxwhen the optimum number of nozzles.

Curves constructed on the basis of processing and generalization of experimental data on more than 300 tests of the combustion chambers of different engines.

The least value of the incomplete burning of fuel and almost minimal emissions of NOxcorresponds to the number of nozzles of the calculation: three pieces 100 cm2square transverse (middle) section of the flame tube.

When reducing the (optimal) number of nozzles increases and underburning of fuel and emissions of NOx.

When zooming in (optimal) number of nozzles emissions of NOxdecreases almost imperceptibly (solid curve asymptotically approaches the horizontal), and underburning of fuel increases dramatically.

The course of the left part of the curves is explained by the processes of poor distribution and mixing of the fuel in the combustion chamber throughout the mass of air that is accompanied by incomplete burning of fuel and emissions of NOx.

Course right side crooked is the circulation of the combustion chambers with the optimum number of nozzles (3 pieces 100 cm2cross-sectional area of the flame tube) allows to provide minimum levels of underburning of fuel and emissions of NOxto reduce weight, complexity and cost of manufacture of the engine to increase its efficiency and environmental cleanliness.

The combustion chamber of a gas turbine engine with an optimum number of nozzles, comprising a housing, a heating pipe and the front of the device with the air swirler and nozzle supply of liquid or gaseous fuel, characterized in that the front camera device made with the optimum number of nozzles - three pieces 100 cm2square transverse (middle) section of the flame tube.

 

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Burner // 2099639

The invention relates to energy, transport and chemical engineering and can be used in combustion chambers of gas turbines, and other fuel combustion devices

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.

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FIELD: gas-turbine engines.

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EFFECT: reduced emission of pollutants in exhaust gases, improved starting characteristics and fuel economic efficiency, enhanced reliability of combustion chamber.

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FIELD: mechanical engineering; gas-turbine engines.

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