A fuel atomization system suitable for the combustion chamber of a regenerative micro gas turbine

Abstract

This invention discloses a fuel atomization system suitable for the combustion chamber of a regenerative micro gas turbine, comprising: a T-shaped evaporator, a swirling oil-gas duct, a coaxial atomizing nozzle, an air intake pipe, and a fuel line protection sleeve; the T-shaped evaporator, the swirling oil-gas duct, and the coaxial atomizing nozzle are arranged coaxially, the air intake pipe is eccentrically connected to the side wall of the coaxial atomizing nozzle and can introduce high-pressure gas from the section before the regenerator after the compressor, the initially atomized mixed oil and gas enters the swirling oil-gas duct for further atomization and then evaporates and is ejected through the T-shaped evaporator, the fuel line protection sleeve is coaxially arranged on the outside of the swirling oil-gas duct and the coaxial atomizing nozzle and can avoid the direct impact of high-temperature backflow gas on the coaxial atomizing nozzle. This invention can significantly optimize fuel atomization quality, shorten the combustion chamber length, improve combustion efficiency, and improve the uniformity of combustion chamber outlet temperature distribution by adding a coaxial atomizing nozzle and an air intake pipe upstream of the traditional evaporator.

Description

Technical Field

[0001] This invention belongs to the field of gas turbine technology, specifically relating to a fuel atomization system suitable for the combustion chamber of a regenerative micro gas turbine. Background Technology

[0002] Micro gas turbines typically have a single unit power output between 25kW and 300kW. Air is compressed by a compressor, increasing its pressure and temperature. The compressed air doesn't directly enter the combustion chamber but first flows through a regenerator, where it's preheated by the high-temperature exhaust gas from the turbine. This preheated air enters the combustion chamber, mixes with fuel, and burns to generate high-temperature gas. This high-pressure, high-temperature gas impacts the turbine blades, causing them to rotate and perform work. However, the fuel flow rate in the micro gas turbine combustion chamber is relatively low. Traditional centrifugal nozzle pressure atomization requires high machining precision and is prone to clogging. Evaporator tube fuel supply, due to its simple structure, light weight, and suitability for low-flow fuel atomization, is often used in micro gas turbine combustion chambers.

[0003] However, the evaporator fuel supply method has disadvantages such as difficulty in ignition, slow flame connection, and high lean-fuel flameout threshold due to the low fuel atomization quality.

[0004] Furthermore, when traditional T-shaped or U-shaped evaporator tubes are applied to the combustion chamber of a high-temperature regenerative micro gas turbine, the fuel nozzle is exposed to the high-temperature incoming gas (high-temperature, high-pressure gas reheated by the regenerator), and the fuel pipeline is enveloped by the high-temperature gas passing through the turbine. This easily leads to coking and blockage of the nozzle, fuel boiling, and consequently, large fluctuations in fuel flow. For example, this can cause malfunctions such as stalling at idle or oscillating combustion.

[0005] Therefore, how to provide a fuel atomization system suitable for the combustion chamber of a regenerative micro gas turbine is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] In view of this, the present invention takes into account the shortcomings of the evaporator tube fuel atomization system and the special application scenario of the regenerative micro gas turbine combustor, and provides a fuel atomization system suitable for the regenerative micro gas turbine combustor. This fuel atomization system can significantly improve the fuel atomization effect, especially the fuel atomization effect under low operating conditions, thereby improving combustion efficiency and improving the temperature distribution at the combustor outlet, while avoiding direct contact between the fuel pipeline and the high-temperature gas or regenerative flow.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a fuel atomization system suitable for the combustion chamber of a regenerative micro gas turbine, characterized in that it comprises: a T-shaped evaporator, a swirling oil-gas duct, a coaxial atomizing nozzle, an air intake pipe, and a fuel line protection sleeve; the T-shaped evaporator, the swirling oil-gas duct, and the coaxial atomizing nozzle are arranged coaxially from one end to the other; the air intake pipe is eccentrically connected to the side wall of the coaxial atomizing nozzle and can introduce high-pressure gas from the section before the regenerator after the compressor, thereby promoting the initial atomization of fuel in the coaxial atomizing nozzle; the initially atomized mixed oil and gas enters the swirling oil-gas duct for further atomization and then evaporates and is ejected from the combustion chamber flame tube through the T-shaped evaporator; the fuel line protection sleeve is coaxially arranged on the outside of the swirling oil-gas duct and the coaxial atomizing nozzle and can prevent the direct impact of high-temperature backflow gas on the coaxial atomizing nozzle.

[0008] The beneficial technical effects of this invention are as follows: It utilizes high-pressure air to achieve multi-stage synergistic atomization, significantly improving fuel atomization and mixing quality within a very compact combustion chamber space. Simultaneously, through structural self-protection, it effectively addresses the impact of high temperatures on the fuel system. Specifically, bleed air pre-atomization introduces high-pressure gas between the compressor and the regenerator via a bleed air pipe. This gas has high pressure (after the compressor) and moderate temperature (before being heated by the regenerator), causing the fuel line to be enveloped by low-temperature bleed air, preventing contact with the regenerated flow. Using it as an atomizing medium generates strong shear force, initially breaking the fuel into finer droplets, and effectively avoiding the problems of deformation, fuel boiling, and coking that can easily occur when high-temperature gas acts on key geometric structures such as the fuel line and nozzles for extended periods. Further swirling re-atomization involves the pre-atomized fuel-air mixture entering a swirling fuel-air conduit, where centrifugal force... In this process, heavier, larger droplets are thrown against the pipe wall and further broken up. At the same time, the strong swirling flow greatly enhances the uniformity of fuel-air mixing, achieving a homogenized mixture effect. Finally, the mixture is atomized and ejected through the T-shaped evaporator. The highly uniform mixture enters the T-shaped evaporator, and with the high-quality pretreatment of the first two stages, the load on the evaporator is greatly reduced. The mixture is heated and rapidly evaporates into a gaseous state inside the pipe, and finally, a completely gaseous, highly uniform mixture is ejected from both ends of the T-shaped pipe, thereby improving combustion efficiency. In addition, the fuel line protection sleeve provides thermal protection. It wraps around the outside of the swirling fuel-air duct and the coaxial atomizing nozzle, which can isolate radiant heat and prevent direct contact between the fuel line and the high-temperature combustion gas. Furthermore, the coaxial atomizing nozzle, which has lower fuel pressure requirements, can use a larger diameter fuel nozzle, which effectively prevents fuel line blockage caused by fuel coking and carbonization.

[0009] Preferably, the coaxial atomizing nozzle includes an air chamber and a direct-injection fuel nozzle. The air chamber is a long, rotating structure with an air contraction nozzle at its head. The direct-injection fuel nozzle is located in the air chamber and is coaxially arranged with the air contraction nozzle. The end of the direct-injection fuel nozzle is 1-2 mm away from the air contraction nozzle. The air intake pipe is eccentrically connected to the air chamber and can generate swirling air in the air chamber. The external fuel introduced by the direct-injection fuel nozzle is initially atomized at the air contraction nozzle under the action of the swirling air.

[0010] The resulting technical effect is that by utilizing the high-speed swirling flow generated by the eccentric air intake, efficient pneumatic shearing and centrifugal atomization of the direct-injection fuel are achieved within a precise gap of 1-2 mm. This generates fine and uniform initial oil mist over an extremely short distance with the simplest non-moving part structure, creating optimal conditions for deep atomization and complete evaporation of the downstream swirling duct and T-shaped evaporator.

[0011] Preferably, the air intake tube is perpendicular to the central axis of the air cavity and has an eccentric distance of 3-5 mm.

[0012] The resulting technical effect is that by using eccentricity to introduce high-pressure, low-temperature gas eccentrically, it can protect the fuel nozzle on the one hand, and generate swirling gas on the other hand, which facilitates the initial atomization of fuel gas at the converging nozzle.

[0013] Preferably, the swirling oil-gas conduit is coaxially fixedly connected to one end of the air cavity near the air contraction nozzle. The side wall of the swirling oil-gas conduit is provided with a plurality of tangential air inlets, which are located upstream of the air contraction nozzle. The tangential air inlets are used to introduce compressed air that has passed through the regenerator. The direction of the swirling air generated by the tangential air inlets is opposite to the direction of the swirling air generated by the air intake pipe.

[0014] The resulting technical effect is that by introducing high-temperature air rotating in the opposite direction, the mixed gas ejected from the upstream nozzle can be further impacted and atomized, providing optimal input for the T-shaped evaporator tube, and ultimately achieving efficient, clean, and stable combustion.

[0015] Preferably, the air intake pipe can draw high-pressure, low-temperature gas, accounting for 2% of the total gas volume, from the compressor and the regenerator to perform preliminary atomization of the fuel.

[0016] The resulting technical effect is as follows: Air is drawn from before the regenerator into the fuel atomization system. The pressure difference created by the flow losses in the regenerator (in regenerating micro gas turbines, while the regenerator recovers waste heat and improves overall efficiency, it also introduces a side effect—flow resistance. This causes the pressure of the high-pressure air from the compressor to drop significantly after passing through the regenerator) generates a high-speed airflow, enhancing atomization. In other words, the pressure difference between the upstream and downstream outlets of the coaxial atomizing nozzle generates a high-speed airflow. This high-pressure air, as it passes through a carefully designed nozzle channel, accelerates rapidly due to the pressure difference, ultimately being ejected at extremely high speed, thus enhancing the atomization effect.

[0017] Preferably, the oil circuit protection sleeve has a cylindrical structure, and its two ends are respectively connected to the outer wall of the combustion chamber and the outer casing of the gas turbine.

[0018] The resulting technical effects are: the combustion chamber and the casing provide a stable structural foundation for the installation of the fuel line protection sleeve; at the same time, the fuel line protection sleeve avoids the direct impact of high-temperature combustion gases on the fuel line, and avoids problems such as deformation of key geometric structures of the fuel line, fuel boiling, and coking.

[0019] Preferably, there are multiple T-shaped evaporator tubes arranged in a ring array at the mid-diameter position of the flame tube head of the recirculation combustion chamber of the regenerative micro gas turbine. Each of the multiple T-shaped evaporator tubes includes a main pipe and two branch pipes, and each of the two branch pipes is provided with a constriction nozzle. The main pipe includes a connecting section, a mid-diameter section, a conical transition section, and a small-diameter section. The inner diameter of the branch pipe is the same as the inner diameter of the small-diameter section. The airflow direction in the main pipe is opposite to the airflow direction of the constriction nozzle in the branch pipe. The connecting section is used for static sealing connection of the swirling oil and gas duct.

[0020] The resulting technical effects are: through circumferential distribution at the mid-diameter position, reverse airflow design between the main pipe and branch pipes, and aerodynamic optimization of the constricted nozzle and variable diameter flow channel, rapid, uniform, and stable ejection of fuel vapor in the flame tube is achieved, significantly improving the ignition performance, combustion efficiency, and uniformity of the outlet temperature field of the combustion chamber.

[0021] Preferably, a grate sealing structure is provided on the inner wall of the corresponding connecting section of the main pipe, and the main pipe is statically sealed to the outer wall of the swirling oil and gas duct through the grate sealing structure.

[0022] The resulting technical effect is that by utilizing the throttling effect of the comb teeth, a non-contact, highly reliable, and long-life labyrinth seal is constructed at the static sealing interface under high temperature and pressure fluctuations, solving the problems of easy leakage, easy burning, and difficult maintenance of the connection parts in the regenerative micro-gas engine. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the axial section structure of a fuel atomization system suitable for the combustion chamber of a regenerative micro gas turbine according to the present invention;

[0024] Figure 2 This is a schematic diagram of a T-shaped evaporator tube for a fuel atomization system suitable for the combustion chamber of a regenerative micro gas turbine according to the present invention; Figure 3 for Figure 2 A schematic diagram of the axial section structure; Figure 4 This is a schematic diagram of the axial cross-section of a swirl oil-gas duct structure for a fuel atomization system suitable for the combustion chamber of a regenerative micro gas turbine according to the present invention. Figure 5 This is a schematic diagram of the coaxial atomizing nozzle structure of a fuel atomization system suitable for the combustion chamber of a regenerative micro gas turbine according to the present invention; Figure 6 This is a schematic diagram of the assembly of a fuel atomization system and a flame tube suitable for the combustion chamber of a regenerative micro gas turbine according to the present invention; Figure 7 This is a schematic diagram of a fuel atomization system for a regenerative micro gas turbine combustion chamber, as described in this invention, within a regenerative micro gas turbine. Figure 8 This is a schematic diagram of air and fuel flow in an example of a regenerative micro gas turbine.

[0025] 1. T-shaped evaporator pipe, 11. Main pipe, 111. Connecting section, 112. Medium diameter section, 113. Conical transition section, 114. Small diameter section, 115. Grate sealing structure, 12. Branch pipe, 2. Swirl oil and gas duct, 21. Tangential air inlet, 3. Coaxial atomizing nozzle, 31. Air chamber, 32. Direct fuel nozzle, 33. Air contraction nozzle, 4. Air intake pipe, 5. Oil circuit protection sleeve, 6A. Combustion chamber flame tube, 6B. Combustion chamber outer wall, 6C. Outer casing. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] See the appendix of this invention. Figures 1 to 8According to an embodiment of the present invention, a fuel atomization system suitable for the combustion chamber of a regenerative micro gas turbine includes: a T-shaped evaporator 1, a swirling oil-gas duct 2, a coaxial atomizing nozzle 3, an air intake pipe 4, and an oil circuit protection sleeve 5; the T-shaped evaporator 1, the swirling oil-gas duct 2, and the coaxial atomizing nozzle 3 are arranged coaxially from one end to the other; the air intake pipe 4 is eccentrically connected to the side wall of the coaxial atomizing nozzle 3 and can introduce high-pressure gas from the section before the regenerator after the compressor, which promotes the initial atomization of fuel in the coaxial atomizing nozzle 3; the initially atomized mixed oil and gas enters the swirling oil-gas duct 2 for further atomization and then evaporates and is ejected in the combustion chamber flame tube 6A through the T-shaped evaporator 1; the oil circuit protection sleeve 5 is coaxially arranged on the outside of the swirling oil-gas duct 2 and the coaxial atomizing nozzle 3 and can avoid the direct impact of high-temperature backflow gas on the coaxial atomizing nozzle 3.

[0028] like Figure 6 As shown, multiple T-shaped evaporator tubes are welded to the head of the flame tube; the same number of coaxial atomizing nozzles as the T-shaped evaporator tubes are bolted to the nozzle mounting seats on the casing; during the testing phase, the swirling oil-gas conduit and the coaxial atomizing nozzles can be threaded together to facilitate the replacement of test pieces; during the application phase, the swirling oil-gas conduit and the coaxial atomizing nozzles can be welded together; the oil circuit protection sleeve is used to isolate the high-temperature gas from the oil circuit and is generally welded to the casing.

[0029] In other embodiments, the coaxial atomizing nozzle 3 includes an air chamber 31 and a direct fuel nozzle 32. The air chamber 31 is a long, rotating structure with an air contraction nozzle 33 at its head. The direct fuel nozzle 32 is located in the air chamber 31 and is coaxially arranged with the air contraction nozzle 33. The end of the direct fuel nozzle 32 is 1-2 mm away from the air contraction nozzle 33. The air intake pipe 4 is eccentrically connected to the air chamber 31 and can generate swirling air in the air chamber 31. The external fuel (fuel) introduced by the direct fuel nozzle 32 is initially atomized in the air contraction nozzle 33 under the action of the swirling air.

[0030] The inner diameter of the direct-injection fuel nozzle is determined by the fuel flow rate, so that the fuel injection velocity is 2~5m / s; the inner diameter of the air contraction nozzle is the decisive factor affecting the air flow rate of the coaxial atomizing nozzle 3, and the air intake of the coaxial atomizing nozzle 3 should be 2~3 times the fuel flow rate; the inner diameter of the air intake pipe is 4mm and the outer diameter is 6mm.

[0031] Specifically, the air intake tube 4 is perpendicular to the central axis of the air chamber 31 and has an eccentric distance of 3-5 mm.

[0032] In other embodiments, the swirling oil-gas duct 2 is coaxially fixedly connected to one end of the air cavity 31 near the air contraction nozzle 33. The side wall of the swirling oil-gas duct 2 is provided with a plurality of tangential air inlets 21, which are located upstream of the air contraction nozzle 33. The tangential air inlets 21 are used to introduce compressed air that has passed through the regenerator. The swirling air generated by the tangential air inlets 21 is in the opposite direction to the swirling air generated by the air intake pipe 4, which can further enhance the atomization effect.

[0033] The area of ​​the tangential air inlet 21 is determined by the air intake volume of the tangential air inlet and the pressure loss of the flame tube. The air intake volume of the tangential air inlet 21 is the total air intake volume of the evaporator tube minus the air intake volume of the coaxial atomizing nozzle. The constriction outlet diameter of the swirling oil and gas duct is generally 0.8 times the inlet diameter of the swirling oil and gas duct. The swirling oil and gas duct is designed to be wider at the front and narrower at the back to reduce swirling losses.

[0034] The intake pipe 4 is an airflow pipe from the compressor of its gas turbine to the coaxial atomizing nozzle. The intake pipe 4 can draw high-pressure low-temperature gas, accounting for 2% of the total gas volume, from the compressor to the compressor and perform preliminary atomization of fuel.

[0035] In some other embodiments, the oil circuit protection sleeve 5 has a cylindrical structure, and the two ends of the oil circuit protection sleeve 5 are respectively connected to the outer wall 6B of the combustion chamber and the outer casing 6C of the gas turbine, resulting in a stable installation structure.

[0036] In a specific embodiment, there are multiple T-shaped evaporator tubes 1, which are arranged in a ring array at the mid-diameter position of the flame tube head of the recirculation combustion chamber of the regenerative micro gas turbine. Each T-shaped evaporator tube 1 includes a main pipe 11 and two branch pipes 12, and each branch pipe 12 is provided with a converging nozzle. The main pipe 11 includes a connecting section 111, a mid-diameter section 112, a conical transition section 113, and a small-diameter section 114. The inner diameter of the branch pipe 12 is the same as the inner diameter of the small-diameter section 114. The airflow direction in the main pipe 11 is opposite to the airflow direction of the converging nozzle of the branch pipe. The connecting section 111 is used for static sealing connection of the swirling oil and gas duct 2.

[0037] The branch pipe outlet diameter D13 of the evaporator is determined based on the combustion chamber flow distribution and pressure loss in the example. Considering the high incoming flow temperature of the regenerative micro gas turbine combustion chamber, the residual gas coefficient at the evaporator outlet is generally set to 0.35~0.4. To ensure smooth airflow, the main pipe small diameter section diameter D12 of the evaporator should meet the following requirements. The diameter D11 of the main pipe of the evaporator is 1.2~1.5D12. During the design, it should be ensured that the swirling oil and gas conduit can be inserted into the connection section of the main pipe of the evaporator.

[0038] In some other embodiments, a toothed sealing structure 115 is provided on the inner wall of the main pipe 11 corresponding to the connecting section 111, and the main pipe 11 is statically sealed (tightly fitted) to the outer wall of the swirling oil and gas duct 2 through the toothed sealing structure 115.

[0039] Compared with existing technologies, it has the following advantages: 1) High-pressure low-temperature bleed air is used to protect the fuel nozzle, avoiding direct contact between the fuel nozzle and the high-temperature incoming flow passing through the regenerator, thus preventing the nozzle from becoming clogged due to coking. 2) The oil circuit protection sleeve isolates the fuel line from the high-temperature combustion gas returning from the fuel line, preventing the fuel in the fuel line from boiling due to heat and forming a two-phase flow, which would make the fuel flow unstable. 3) The high-pressure bleed air introduced into the coaxial atomizing nozzle is used to perform preliminary atomization of fuel, which improves the fuel atomization quality, improves the ignition and flame performance of the evaporator combustion chamber, improves combustion efficiency, and improves the uniformity of the combustion chamber outlet temperature distribution. 4) The use of swirling oil-gas conduits ensures uniform distribution of the oil-gas mixture in the T-shaped evaporator tube, improving the uniformity of the combustion chamber outlet temperature distribution; 5) The selected nozzle has a simple structure, good atomization effect, and can be used for various fuels such as kerosene, oil extraction, and SUF.

[0040] The apparatus and methods disclosed in the embodiments are described simply because they correspond to the methods disclosed in the embodiments. For relevant details, please refer to the method section.

[0041] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A fuel oil atomizing system suitable for use in a recuperated microturbine combustor, comprising: include: The T-shaped evaporator (1), the swirling oil and gas duct (2), the coaxial atomizing nozzle (3), the air intake pipe (4), and the oil circuit protection sleeve (5) are arranged coaxially from one end to the other. The air intake pipe (4) is eccentrically connected to the side wall of the coaxial atomizing nozzle (3) and can introduce high-pressure gas from the section before the regenerator after the compressor, so as to promote the initial atomization of fuel in the coaxial atomizing nozzle (3). The initially atomized mixed oil and gas enters the swirling oil and gas duct (2) for further atomization and then evaporates and sprays out in the combustion chamber flame tube (6A) through the T-shaped evaporator (1). The oil circuit protection sleeve (5) is coaxially arranged on the outside of the swirling oil and gas duct (2) and the coaxial atomizing nozzle (3) and can avoid the direct impact of high-temperature backflow gas on the coaxial atomizing nozzle (3).

2. The fuel atomization system for a regenerative micro gas turbine combustion chamber according to claim 1, characterized in that, The coaxial atomizing nozzle (3) includes an air chamber (31) and a direct fuel nozzle (32). The air chamber (31) is a long rotating body structure and its head is provided with an air contraction nozzle (33). The direct fuel nozzle (32) is located in the air chamber (31) and is coaxially arranged with the air contraction nozzle (33). The end of the direct fuel nozzle (32) is 1~2mm away from the air contraction nozzle (33). The air intake pipe (4) is eccentrically connected to the air chamber (31) and can generate swirling air in the air chamber (31). The external fuel introduced by the direct fuel nozzle (32) is initially atomized at the air contraction nozzle (33) under the action of the swirling air.

3. The fuel atomization system for a regenerative micro gas turbine combustion chamber according to claim 2, characterized in that, The air intake tube (4) is perpendicular to the central axis of the air cavity (31) and has an eccentric distance of 3-5 mm.

4. A fuel atomization system suitable for the combustion chamber of a regenerative micro gas turbine according to claim 2, characterized in that, The swirling oil and gas duct (2) is coaxially fixedly connected to one end of the air cavity (31) near the air contraction nozzle (33). The side wall of the swirling oil and gas duct (2) is provided with a plurality of tangential air inlets (21). The tangential air inlets (21) are located upstream of the air contraction nozzle (33). The tangential air inlets (21) are used to introduce compressed air that has passed through the regenerator. The direction of the swirling air generated by the tangential air inlets (21) is opposite to the direction of the swirling air generated by the air intake pipe (4).

5. A fuel atomization system suitable for the combustion chamber of a regenerative micro gas turbine according to claim 1, characterized in that, The air intake pipe (4) can draw high-pressure low-temperature gas, which accounts for 2% of the total gas volume, from the compressor and the regenerator and perform preliminary atomization of fuel.

6. A fuel atomization system suitable for the combustion chamber of a regenerative micro gas turbine according to claim 1, characterized in that, The oil circuit protection sleeve (5) has a cylindrical structure, and the two ends of the oil circuit protection sleeve (5) are respectively connected to the outer wall of the combustion chamber (6B) and the outer casing (6C) of the gas turbine.

7. A fuel atomization system suitable for the combustion chamber of a regenerative micro gas turbine according to claim 1, characterized in that, There are multiple T-shaped evaporator tubes (1), which are arranged in a ring array at the mid-diameter position of the flame tube head of the recirculation combustion chamber of the regenerative micro gas turbine. Each of the multiple T-shaped evaporator tubes (1) includes a main pipe (11) and two branch pipes (12). Each of the two branch pipes (12) is provided with a constriction nozzle. The main pipe (11) includes a connecting section (111), a mid-diameter section (112), a conical transition section (113), and a small-diameter section (114). The inner diameter of the branch pipe (12) is the same as the inner diameter of the small-diameter section (114). The airflow direction in the main pipe (11) is opposite to the airflow direction of the constriction nozzle of the branch pipe. The connecting section (111) is used for static sealing connection of the swirling oil and gas duct (2).

8. A fuel atomization system suitable for the combustion chamber of a regenerative micro gas turbine according to claim 7, characterized in that, A toothed sealing structure (115) is provided on the inner wall of the connecting section (111) of the main pipe (11), and the main pipe (11) is statically sealed to the outer wall of the swirling oil and gas duct (2) through the toothed sealing structure (115).

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