A micro gas turbine

Abstract

The present invention relates to the technical field of display equipment, and discloses a micro gas turbine, which includes a compressor, a combustion chamber and a turbine; wherein the combustion chamber includes: a gas premixing part for mixing gas and air to form a mixed gas; a flame tube connected to the gas premixing part, for receiving the mixed gas mixed by the gas premixing part and burning the mixed gas, and a plurality of vents are formed on the side wall of the flame tube facing the gas premixing part; a control component movably installed on the flame tube, for controlling the opening or closing of the vents. The micro gas turbine reduces combustion oscillation by arranging vents and control components on the flame tube, which is simple to operate, has significant effects, is low in cost, and does not significantly increase the mass of the whole machine.

Description

Technical Field

[0001] The present invention relates to the technical field of display equipment, and in particular to a micro gas turbine. Background Art

[0002] Micro gas turbines are widely used in the field of distributed power generation due to their compact structure, light weight and low maintenance costs. Micro gas turbines have three major components: compressor, combustion chamber and turbine. The overall performance of the combustion chamber directly affects the overall performance of the micro gas turbine.

[0003] At present, the government departments have increasingly stringent requirements for pollutant emissions (mainly NOx) generated by combustion. In order to reduce the emission of pollutants in the combustion chamber, the mainstream design concept in the world is premixed combustion, and the combustion temperature is controlled at 1600K-1900K, but combustion oscillation is very likely to occur under this combustion condition. Combustion oscillation is the pressure pulsation caused by unstable combustion. When the relative frequency of the heat release of combustion and the pressure pulsation in the flame tube of the combustion chamber is between -90 degrees and 90 degrees, the energy of the heat release of combustion will promote the pressure pulsation. When the pressure pulsation is large enough, it will cause mechanical vibration to damage the combustion chamber and its attached equipment. At present, there are mainly active control methods and passive control methods in the world to control combustion oscillation. The active control method generally monitors the pressure in the combustion chamber, and then adjusts the amount of fuel according to the pressure, changes the heat release of combustion in the combustion chamber, and then controls the combustion oscillation. Passive control currently used in the world is to install a shock absorber tube on the combustion chamber to absorb the sound energy generated by the combustion oscillation, thereby controlling the combustion oscillation. Both of these methods require the installation of other equipment on the combustion chamber, which increases the cost and makes the equipment more bulky. Summary of the invention

[0004] The present invention provides a micro gas turbine, which controls combustion oscillation by arranging vent holes and control components on a flame tube, has simple operation, significant effect, low cost and does not significantly increase the mass of the entire machine.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] The present invention provides a micro gas turbine, comprising a compressor, a combustion chamber and a turbine; wherein the combustion chamber comprises:

[0007] A gas premixing part for mixing gas with air to form a mixed gas;

[0008] A flame tube connected to the gas premixing part and used for receiving the mixed gas mixed by the gas premixing part and burning the mixed gas, wherein a plurality of vent holes are formed on the side wall of the flame tube facing the gas premixing part;

[0009] A control component is movably mounted on the flame tube and is used to control the opening or closing of the vent hole.

[0010] The above-mentioned micro gas turbine includes a compressor, a combustion chamber and a turbine; wherein the combustion chamber includes a gas premixing part, a flame tube and a control component, the gas premixing part is used to mix the gas entering the gas premixing part with air to form a mixed gas; the gas premixing part is connected to the flame tube, and the mixed mixed gas enters the flame tube from the gas premixing part and burns in the flame tube, a plurality of air vents are formed on the side wall of the flame tube facing the gas premixing part, the control component is movably installed on the flame tube, and the air vents can be controlled to be opened or closed by the control component; during the operation of the combustion chamber of the above-mentioned micro gas turbine, the gas and air are first introduced into the gas premixing part respectively according to demand, and the gas and air are fully mixed inside the gas premixing part to form a mixed gas, and then the mixed gas is introduced into the gas premixing part connected to the gas premixing part When the mixture burns inside the flame tube, when the relative frequency of the combustion heat release and the pressure pulsation in the flame tube is between -90 degrees and 90 degrees, the energy of the combustion heat release will promote the pressure pulsation. At this time, the vent hole can be opened by the control component. The vent hole can absorb and dissipate part of the sound energy generated by the pressure oscillation in the flame tube, thereby weakening the pressure oscillation caused by thermal-acoustic coupling, making the combustion tend to be stable, thereby preventing the mechanical vibration caused by the pressure pulsation from affecting the micro gas turbine, especially causing damage to the combustion chamber. After the pressure oscillation in the combustion chamber is weakened, the vent hole can be closed as needed. The design of arranging the vent hole on the flame tube and controlling the state of the vent hole by the control component provided by the present invention is simple to operate, has significant effect, low cost and will not significantly increase the weight of the whole machine.

[0011] Preferably, the control component includes a cover plate, which is rotatably mounted on the flame tube around the central axis of the flame tube, and a plurality of through holes are formed on the cover plate that penetrate the cover plate in the thickness direction. When the cover plate is located at the first workstation, the orthographic projection of the through hole on the side wall of the flame tube facing the cover plate covers the vent so that the vent is in an open state; when the cover plate is located at the second workstation, the orthographic projection of the through hole on the side wall of the flame tube facing the cover plate has no overlap with the vent so that the vent is in a closed state.

[0012] Preferably, an opening is provided at one end of the flame tube facing the gas premixing part, a protrusion protruding toward one side of the gas premixing part is formed at the edge of the opening, and the cover plate is sleeved on the outer side of the protrusion.

[0013] Preferably, a plurality of groups of ventilation holes are formed on the side wall of the flame tube facing the gas premixing part, which are spaced apart along a circular trajectory whose center line coincides with the center line of the flame tube, and each group of ventilation holes includes a plurality of radially arranged ventilation holes along the side wall of the flame tube facing the gas premixing part.

[0014] Preferably, the cover plate is in the shape of a ring, and is provided with a plurality of via holes spaced apart along a circular trajectory whose center line coincides with the center line of the cover plate, each via hole corresponds to each group of ventilation holes, or the cover plate is provided with a via hole corresponding one-to-one to each ventilation hole.

[0015] Preferably, the vent hole is circular.

[0016] Preferably, the diameter of the vent hole is 0.8 mm to 2 mm.

[0017] Preferably, the gas premixing part includes a radial swirler, a duty-stage gas pipe, a main-stage gas pipe, a main-stage gas cavity, a main-stage gas nozzle and a premixing channel.

[0018] Preferably, the amount of air entering the flame tube through all the air holes is less than ten percent of the amount of air entering the flame tube through the radial swirler.

[0019] Preferably, the flame tube further includes a mixing hole which is arranged on the side wall of the flame tube and penetrates the side wall of the flame tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic structural diagram of a combustion chamber of a micro gas turbine provided by the present invention;

[0021] Figure 2 A schematic diagram of the structure of a cover plate in a flame tube of a micro gas turbine provided by the present invention when the cover plate is located at the first working position;

[0022] Figure 3 A schematic structural diagram of a cover plate in a flame tube of a micro gas turbine provided by the present invention when the cover plate is located at the second working position.

[0023] icon:

[0024] 1-gas premixing part; 2-flame tube; 3-vent; 4-control component; 5-through hole; 6-protrusion; 7-radial swirler; 8-duty class gas pipe; 9-main stage gas pipe; 10-main stage gas cavity; 11-main stage gas nozzle; 12-premixing channel; 13-mixing hole. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] Please refer to Figure 1 , Figure 2 and Figure 3 The present invention provides a micro gas turbine, comprising a compressor, a combustion chamber and a turbine; wherein the combustion chamber comprises:

[0027] A gas premixing part 1 for mixing gas with air to form a mixed gas;

[0028] A flame tube 2 is communicated with the gas premixing part 1 and is used to receive the mixed gas mixed by the gas premixing part 1 and burn the mixed gas. A plurality of vent holes 3 are formed on the side wall of the flame tube 2 facing the gas premixing part 1.

[0029] A control component 4 is movably mounted on the flame tube 2 and is used to control the opening or closing of the ventilation hole 3.

[0030] The micro gas turbine comprises a compressor, a combustion chamber and a turbine; wherein the combustion chamber comprises a gas premixing part 1, a flame tube 2 and a control component 4, the gas premixing part 1 is used to mix the gas entering the gas premixing part 1 with air to form a mixed gas; the gas premixing part 1 is connected to the flame tube 2, and the mixed mixed gas enters the flame tube 2 from the gas premixing part 1 and burns in the flame tube 2, a plurality of vents 3 are formed on the side wall of the flame tube 2 facing the gas premixing part 1, the control component 4 is movably mounted on the flame tube 2, and the vents 3 can be controlled to be opened or closed by the control component 4; during the operation of the combustion chamber of the micro gas turbine, the gas and air are first introduced into the gas premixing part 1 respectively according to demand, and the gas and air are fully mixed in the gas premixing part 1 to form a mixed gas, and then the mixed gas is introduced into the gas premixing part 1 and the gas premixing part 1. When the mixed gas burns inside the flame tube 2 connected with the flame tube 1, when the relative frequency of the combustion heat release and the pressure pulsation in the flame tube 2 is between -90 degrees and 90 degrees, the energy of the combustion heat release will promote the pressure pulsation. At this time, the vent hole 3 can be opened by the control component 4. The vent hole 3 can absorb and dissipate part of the sound energy generated by the pressure oscillation in the flame tube 2, thereby weakening the pressure oscillation caused by the thermal-acoustic coupling, making the combustion tend to be stable, thereby preventing the mechanical vibration caused by the pressure pulsation from affecting the micro gas turbine, especially damaging the combustion chamber. After the pressure oscillation in the combustion chamber is weakened, the vent hole 3 can be closed as needed. The design of arranging the vent hole 3 on the flame tube 2 and controlling the state of the vent hole 3 by the control component 4 provided by the present invention is simple to operate, has significant effect, is low in cost and will not significantly increase the weight of the whole machine.

[0031] Specifically, Figure 2 and Figure 3 As shown, the control component 4 includes a cover plate, which is rotatably mounted on the flame tube 2 around the central axis of the flame tube 2, and a plurality of through holes 5 are formed on the cover plate that penetrate the thickness direction of the cover plate. When the cover plate is located at the first station, the orthographic projection of the through holes 5 on the side wall of the flame tube 2 facing the cover plate covers the vent hole 3 so that the vent hole 3 is in an open state; when the cover plate is located at the second station, the orthographic projection of the through holes 5 on the side wall of the flame tube 2 facing the cover plate has no overlap with the vent hole 3 so that the vent hole 3 is in a closed state.

[0032] The control component 4 includes a cover plate rotatably mounted on the flame tube 2 around the central axis of the flame tube 2, and a through hole 5 penetrating the thickness direction of the cover plate is provided on the cover plate. The cover plate can be rotated to be in a first position to open the vent hole 3 or in a second position to close the vent hole 3. When the cover plate is in the first position, the through hole 5 on the cover plate is aligned with the vent hole, so that an air flow channel is formed between the through hole 5 and the vent hole to absorb and dissipate part of the acoustic energy generated by the pressure oscillation in the flame tube 2, thereby weakening the pressure oscillation generated by the thermal-acoustic coupling; when the cover plate is rotated to be in the second position, the through hole 5 is not directly opposite to the vent hole 3 so that the air flow channel between the vent hole 3 and the through hole 5 is closed, thereby closing the vent hole 3. In the above adjustment process, it is only necessary to rotate the cover plate to switch the cover plate between the first position and the second position, and the adjustment method is simple.

[0033] Specifically, Figure 1 As shown, an opening is provided at one end of the flame tube 2 facing the gas premixing part 1 , a protrusion 6 protruding toward the gas premixing part 1 is formed at the edge of the opening, and a cover plate is sleeved on the outer side of the protrusion 6 .

[0034] An intercepting portion is provided at one end of the protrusion 6 away from the vent hole 3, which is parallel to the side wall of the flame tube 2 where the vent hole 3 is provided and extends from the center of the opening to a direction away from the center. The cover plate is provided between the intercepting portion and the side wall of the flame tube 2 where the vent hole 3 is provided.

[0035] Specifically, Figure 2 As shown, a plurality of groups of ventilation holes 3 are formed on the side wall of the flame tube 2 facing the gas premixing part 1, and are distributed at intervals along a circular trajectory whose center line coincides with the center line of the flame tube 2. Each group of ventilation holes 3 includes a plurality of ventilation holes 3 radially arranged along the side wall of the flame tube 2 facing the gas premixing part 1.

[0036] Each through hole 5 on the cover plate corresponds to a plurality of vent holes 3 , and the number of through holes 5 and vent holes 3 can be set as required to achieve an optimal effect.

[0037] Specifically, the cover plate is in the shape of a ring, and is provided with a plurality of via holes 5 spaced apart along a circular trajectory whose center line coincides with the center line of the cover plate, each via hole 5 corresponds to each group of vent holes 3, or the cover plate is provided with a via hole 5 corresponding one-to-one to each vent hole 3.

[0038] Each through hole 5 on the cover plate corresponds to a group or one vent hole 3, and the number of through holes 5 and vent holes 3 can be set as needed to achieve the best effect. The shape of the through hole 5 is circular or other shapes, and it only needs to meet the requirement that when the cover plate is located at the first working position, the orthographic projection of the through hole 5 on the side wall of the flame tube 2 facing the cover plate covers the vent hole 3 so that the vent hole 3 is in an open state.

[0039] Specifically, Figure 2As shown, the vent hole 3 is circular.

[0040] The vent hole 3 is preferably circular, but may also be in other shapes, which are not limited here.

[0041] Specifically, when the shape of the vent hole 3 is circular, the diameter of the vent hole 3 is preferably 0.8 mm to 2 mm.

[0042] Specifically, the diameter of the vent hole 3 can be selected to be 0.8mm, 0.9mm, 1.0mm, 1.0mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm or 2mm, and circular vent holes 3 of different diameters can be set according to specific needs.

[0043] Specifically, Figure 1 As shown, the gas premixing part 1 includes a radial swirler 7, a duty-stage gas pipe 8, a main-stage gas pipe 9, a main-stage gas chamber 10, a main-stage gas nozzle 11 and a premixing channel 12.

[0044] During operation, air enters the gas premixing part 1 from the radial swirler 7, and gas enters the gas premixing part 1 from the duty class gas pipe 8 and the main stage gas pipe 9. The air entering the gas premixing part 1 mixes with the gas to form a mixed gas, and then flows into the flame tube 2 from the premixing channel 12, and the mixed gas burns in the flame tube 2.

[0045] Specifically, the amount of air entering the flame tube 2 through all the air vents 3 is less than ten percent of the amount of air entering the flame tube 2 through the radial swirler 7 .

[0046] The amount of air entering the flame tube 2 through the air holes 3 can be adjusted by adjusting the diameter of the air holes 3 or adjusting the state of the control component 4 to adjust the overlapping area of ​​the orthographic projection of the through hole 5 on the side wall of the flame tube 2 facing the cover plate and the air holes 3, so that the amount of air entering the flame tube 2 through all the air holes 3 is less than ten percent of the amount of air entering the flame tube 2 through the radial swirler 7.

[0047] Specifically, Figure 1 , Figure 2 and Figure 3 As shown, the flame tube 2 further includes a mixing hole 13 which is arranged on the side wall of the flame tube 2 and penetrates the side wall of the flame tube 2 .

[0048] External air can enter the flame tube 2 through the mixing hole 13, and the high-temperature flue gas generated by the combustion of the mixed gas in the flame tube 2 is mixed with the air entering from the mixing hole 13 and then flows out from the combustion chamber outlet.

[0049] Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A micro gas turbine, characterized in that: It includes a compressor, a combustion chamber and a turbine; wherein the combustion chamber includes: A gas premixing part for mixing gas with air to form a mixed gas; A flame tube connected to the gas premixing part and used for receiving the mixed gas mixed by the gas premixing part and burning the mixed gas, wherein a plurality of vent holes are formed on the side wall of the flame tube facing the gas premixing part; A control component movably mounted on the flame tube and used for controlling the opening or closing of the vent hole; The control assembly includes a cover plate, which is rotatably mounted on the flame tube around the central axis of the flame tube, and a plurality of through holes penetrating the thickness direction of the cover plate are formed on the cover plate, and when the cover plate is located at the first station, the orthographic projection of the through hole on the side wall of the flame tube facing the cover plate covers the vent hole so that the vent hole is in an open state; when the cover plate is located at the second station, the orthographic projection of the through hole on the side wall of the flame tube facing the cover plate does not overlap with the vent hole so that the vent hole is in a closed state; An opening is provided at one end of the flame tube facing the gas premixing part, a protrusion protruding toward one side of the gas premixing part is formed at the edge of the opening, and the cover plate is sleeved on the outer side of the protrusion; A plurality of groups of vent holes are formed on the side wall of the flame tube facing the gas premixing part and are spaced apart along a circular trajectory whose center line coincides with the center line of the flame tube, and each group of vent holes includes a plurality of vent holes radially arranged along the side wall of the flame tube facing the gas premixing part; The cover plate is in the shape of a ring, and is provided with a plurality of via holes spaced apart along a circular trajectory whose center line coincides with the center line of the cover plate, each via hole corresponds to each group of vent holes, or the cover plate is provided with a via hole corresponding one-to-one to each vent hole.

2. The micro gas turbine according to claim 1, characterized in that: The vent hole is circular.

3. The micro gas turbine according to claim 2, characterized in that: The diameter of the vent hole is 0.8 mm to 2 mm.

4. The micro gas turbine according to claim 1, characterized in that: The gas premixing part includes a radial swirler, a duty-stage gas pipe, a main-stage gas pipe, a main-stage gas cavity, a main-stage gas nozzle and a premixing channel.

5. The micro gas turbine according to claim 4, characterized in that: The amount of air entering the flame tube through all the air holes is less than 10 percent of the amount of air entering the flame tube through the radial swirler.

6. The micro gas turbine according to claim 1, characterized in that: The flame tube also includes a mixing hole which is arranged on the side wall of the flame tube and penetrates the side wall of the flame tube.

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