The unit fuel injector for burners for liquid fuel, and a method for regulating fuel burners for liquid fuel

 

(57) Abstract:

The invention relates to a unit fuel injector for burners for liquid fuel with a major axis and a region of reverse flow of the fuel injector and the intake area, which is located along the main axis between the fuel nozzle and the area of reverse flow. In the inlet region can be created vortex for fuel. The reverse flow region is bordering the inlet region of the annular gap which narrows in the direction of the flow inlet region and enters line reverse flow. The invention allows to simplify the design of the nozzle, to ensure an exact fit, as well as to improve the accuracy of the control process of the fuel in the burner. 2 S. and 9 C.p. f-crystals, 4 Il.

The invention relates to the field of energy, particularly to nozzles for burners operating on liquid fuel.

Known unit fuel injector for burners for liquid fuel, containing the main axis, the region of reverse flow, the inlet area of the nozzle, and the inlet region is located along the main axis between the sprayer and the reverse flow region and configured to generate eddy currents topolnicki and thermal loads.

A known method of regulating the fuel supply to the burner is operating on liquid fuel, which consists in the fact that zapityvat a constant amount of fuel unit fuel injector, containing the main axis, the region of reverse flow, spray, intake area, which is located along the axis between the sprayer and the region of reverse flow in the inlet region and a vortex for fuel, and the current through the sprayer, adjust by means of the regulating valve installed in the return line flow.

The disadvantage of this method is the lack of regulation of fuel in a burner for liquid fuel.

The objective of the invention is to simplify the design of the nozzle, ensuring accurate fixation under mechanical and thermal loads for a long time, and also improve the accuracy of controlling the supply of fuel to the burner, running on liquid fuel.

The problem is solved in that the unit fuel injector for burners for liquid fuel contains the main axis, the region of reverse flow, the inlet area of the nozzle, and the inlet region is located along the main axis between the die reverse flow contains an annular gap, bordering the inlet region, tapering in the direction from the inlet region and followed the line of the reverse flow.

In addition, the annular gap has basically the shape of a circular ring and is symmetric about the major axis. The annular gap has a cross-section with alternating narrow areas and wide areas.

The annulus moves continuously in multiple channels currents that pass at least one line of the return stream. The flow channels in the form of holes passing, in particular axially relative to the main axis. The flow channels are arranged symmetrically relative to the main axis. Provided by from three to six channels of flow. The flow channels overlap axially with the line of the return stream. At least a region of reverse flow made turning and/or drilling. At least a region of reverse flow made whole.

The task is solved in that a method of regulating the fuel supply to the burner is operating on liquid fuel, is that zapityvat a constant amount of fuel unit fuel injector, containing the main axis, the region of reverse flow, rascim in the inlet region and a vortex for fuel, and the current back to the fuel quantity and the fuel quantity, the current through the sprayer, adjust by means of the regulating valve installed in the return line flow, while the reverse flow region has a ring gap, bordering the inlet region, tapering in the direction from the inlet region and followed the line of the reverse flow.

The region of reverse flow annular gap, which taper goes in-line back flow can simply be manufactured turning and/or drilling, is very precisely geometrically oriented in the unit fuel injector and because of the simple geometry and manufacturability fixed in geometric designs are also at high thermomechanical loads. Through the annular gap formed by the core, which is preferably directed along the main axis and has a shape of a needle. This core also geometrically fixed and may serve to stabilize the vortex flow of the fuel out of the fuel injector. This eddy current is achieved, for example, due to the tangential inflow of the fuel into the intake area, and flow into in the tangential direction of prva split moreover, the part is returned through the annular gap and the line of the reverse flow in the fuel storage. In the annular gap while the turbulence of the flow of fuel is reduced so that the line reverse flow takes place mostly for free from turbulence or at least with reduced turbulence. Thus the flow resistance in the return line flow has a small value. During the flow in the direction of the main axis through the annular gap existing within the turbulence depending on the selected narrowing, respectively, is greatly reduced, and avoids the reverse effect on the rotational symmetry of the flow of fuel in the fuel injector. Due to the simple geometric designs, additionally, it ensures the stability of the shape formed by the annular gap of the core. Hydraulic losses in the area of reverse flow are small. The reduction of turbulence in the area of reverse flow begins upstream, i.e. near the inlet region, and occurs depending on the degree of narrowing in a more or less long axial region. Reducing turbulence also occurs, starting with a weak effect, due to which the rotational simtelnet is what region of reverse flow can be made of a maximum of two parts, in particular of a single part. The annular gap is preferably round and symmetrical relative to the main axis, thereby reliably exclude the influence of the rotational symmetry of the vortex flow in the fuel injector.

To reduce turbulence of the flow of fuel in the area of reverse flow annular gap has a cross-section, which consists of alternating narrow areas and wide areas. These alternating narrow region and a wide region preferably implemented due to the fact that the annular gap moves continuously in multiple channels currents, which flow into the at least one line of the return stream. Each channel currents has preferably a circular cross-section with a diameter, which preferably remains constant when considered in the axial direction and thus, since a certain degree of narrowing of the annular gap forms a wide area in the cross section of the annular gap. The flow channels preferably are holes passing, in particular axially relative to the main axis. Thus cane processing, moreover, the region of reverse flow thus can be manufactured from a single, in particular a metal block, for a small number of operations.

The flow channels are preferably symmetrically, in particular on a circle centered on the main axis. To ensure the possibility of not having a resistance to flow from the annular gap in the line of the reverse flow, there are three or more channels of the flow, in particular from five to ten.

The flow channels are preferably axially overlap with the line of reverse flow, which can be made in the form of the axial bore. Line reverse flow may have a diameter of about 2 cm due to overlapping channels flow line return flow inflow fuel line return flow is achieved with a minimum hydraulic resistance. The middle line of the channel flow, made in particular in the form of axial holes for this lies preferably on the outer perimeter line of the return stream.

The region of reverse flow device of the fuel injector is preferably manufactured by machining and/or drilling. Because of the simple geometry it can be made of several assembled components. With a line containing reverse flow detail of the reverse flow region is preferably connected by welding. Other mounting possibilities, for example by means of pins, are also possible. It is possible also to integrate line back flow is made of one single part of the region of reverse flow, in particular to enter it using a drill.

Aimed at a method of regulating fuel burners for liquid fuel problem is solved accordingly to the invention due to the fact that the unit fuel injector zapityvat a constant amount of fuel, and means provided in the return line flow regulating valve to regulate the amount of fuel, the current back through the line of the return stream. Due to this, also regulated by the amount of fuel, the current through the fuel injector. The unit fuel injector is for this purpose preferably the major axis, the reverse flow region, the inlet region and fuel injector, which are arranged in this sequence along the main axis, and in the inlet region can be created vortex for fuel, in particular due to the tangential zapisywania toplevelmenu from the inlet region and enters line reverse flow. Using the method of quantifying the ratio of the amount of fuel directed through the line reverse flow, and the amount of fuel directed through the fuel injector, can be adjusted in the ratio of 1:40, in particular 1:30.

In Fig. 1 shows a longitudinal section through the unit fuel injector of Fig. 2 is a cross section II-II in Fig. 1; Fig. 3 is a cross section III-III in Fig. 1; Fig. 4 is a cross section IV-IV in Fig. 1.

In Fig. 1 shows in longitudinal section a device of the fuel injector 1, which is directed along the main axis 5 and is essentially rotationally symmetrical with respect to the main axis 5. The unit fuel injector 1 is along the main axis 5, starting from the right edge of the drawing, the fuel injector 3, adjacent the inlet region 2, as well as on adjacent region of reverse flow 4. The reverse flow region 4 has having the form of a circular ring annular gap 6, which narrows down the flow in the region of the constriction (decrease turbulence) D1, D2.

Fig. 1 shows two different versions of narrowing the field, namely the area of narrowing D1 above the main axis 5, in which a short section of the annular gap 6 is narrowed and the area is ergodic continuously in the flow channels 11, which are made in the form of drilled holes. The annular gap 6 generates at its facing the inlet region 2 side of the metal core 13 region of reverse flow 4, which is centered relative to the main axis 5. The flow channels 11 are axially relative to the main axis 5 and fall into situated centric relative to the main axis 5 line return flow 7. This line reverse flow 7 is made in the form of holes. The flow channels 11 are respectively each center 16, which are located on the outer perimeter 15 of the line reverse flow 7. Downstream of the flow channels 11 in-line back flow 7 is the control valve 12.

Fig. 2 shows a cross section perpendicular to the main axis 5 through the unit fuel injector 1 in the region of axial overlap of the line reverse flow 7 flow channels 11. The centers of the 16 channels of the flow 11 lie on a circular outer perimeter line reverse flow 7.

Fig. 3 shows a cross section perpendicular to the main axis 5 in the area between the overlap K and reduce turbulence D1, D2 with six flow channels 11 a circular cross-section, the centers of which u is perpendicular to the main axis 5 of the area of reverse flow 4. Tapering annular gap 6 has a cross-section 8, which has alternately narrow region 9 and the wider region 10. Wide region 10 is formed with flow channels 11. The annular gap 6 covers performed centric relative to the main axis 5 of the core 13.

Fed into the unit fuel injector 1 fuel flows into the inlet region 2 through the inlet channel 17 in the tangential direction. Due to this, in the inlet region 2 is formed with the turbulence eddy current that is rotationally symmetric relative to the main axis 5. Part of this flow according to the flow arrow 14 is directed into the region of reverse flow 4. Another part in the form of swirl flows from the fuel injector 3 is not represented in the combustion chamber. It has a twist for stabilized by the core 13 so that provided a uniform introduction of fuel through the nozzle into the combustion chamber. Due to a thermo-stable geometric fixing region of reverse flow 4 is uniform introduction through the nozzle in a long time at high thermomechanical loads. Also with the turbulence part of the course, which comes in kolawole overlap area K in-line back flow 7 goes for fuel, which is largely free from twists. Due to the regulating valve 12 cross-section of the pipe reverse flow 7 is variable. Depending on the cross-section line reverse flow 7 is regulated current back the amount of fuel. At a constant mass flow of fuel that is injected in the inlet region 2, so by installing a cross-sectional line reverse flow 7 automatic regulation injected through fuel injector 3 fuel quantity. Unit fuel injector 1, the ratio of the amount of fuel directed through the line reverse flow 7, the amount of fuel entering the fuel injector 3 is set between 1:30. This is consistent with the requirements of the burner for liquid fuel for gas turbines, which must be adjusted from idle to maximum power.

The invention is characterized especially durable and just made a region of reverse flow unit fuel injector, in particular for burners for liquid fuel of the gas turbine. The reverse flow region is annular gap that forms centric and Versatel the output current of the fuel injector. The annular gap is constantly narrowing in the direction of the line reverse flow and transforms continuously into the flow channels. These flow channels preferably be axially relative to the main axis and axially overlap with the passing also axially and centered relative to the main axis line of the return stream. The whole area is a reverse flow can be made of a single part using a turning and/or drilling. Due to this, at low cost to manufacture and simple manufacture is provided accurately reproducible geometry. The region of reverse flow is stably fixed in its geometric position even in the case of pulsating flow and high mechanical loads. Separation or loss of large or small parts with a negative impact on the flow in the fuel injector reliably excluded.

1. The unit fuel injector for burners for liquid fuel, containing the main axis, the region of reverse flow, the inlet area of the nozzle, and the inlet region is located along the main axis between the sprayer and the reverse flow region and configured to create a vortex flow of the fuel, characterized in that Oblako area and rolling in-line back flow.

2. The device under item 1, characterized in that the annular gap is mainly in the form of a circular ring and is symmetric about the major axis.

3. Device according to any one of paragraphs.1 to 3, characterized in that the annular gap has a cross-section with alternating narrow areas and wide areas.

4. Device according to any one of paragraphs.1 to 4, characterized in that the annular gap moves continuously in multiple channels currents that pass at least one line of the return stream.

5. The device according to p. 4, characterized in that the flow channels are made in the form of holes passing, in particular, axially relative to the main axis.

6. The device under item 4 or 5, characterized in that the flow channels are arranged symmetrically relative to the main axis.

7. Device according to any one of paragraphs.4 to 6, characterized in that there are from three to six channels of flow.

8. Device according to any one of paragraphs.4 to 7, characterized in that the flow channels overlap axially with the line of the return stream.

9. The unit fuel injector according to any one of the preceding paragraphs, characterized in that at least a region of reverse flow made Turner the, that at least a region of reverse flow made whole.

11. The method of regulating the fuel supply to the burner is operating on liquid fuel, which consists in the fact that zapityvat a constant amount of fuel unit fuel injector, containing the main axis, the region of reverse flow, spray, intake area, which is located along the axis between the sprayer and the region of reverse flow in the inlet region and a vortex for fuel, and the current back to the fuel quantity and the fuel quantity, the current through the sprayer, adjust by means of the regulating valve installed in the return line flow, characterized in that the region of reverse flow is annular gap, bordering the inlet region, tapering in the direction from the inlet region and followed the line of the reverse flow.

 

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