Fuel oil pre-evaporation flame tube

Abstract

According to the fuel oil pre-evaporation flame tube, the gas supply port is formed in the outer ring of the flame tube, cooling gas absorbs heat and cools the wall face of the flame tube through the bent pipe gas path channel to form high-temperature gas, and fuel oil in the annular oil storage groove absorbs the high-temperature gas from the corrugated gas path channel and heat of the inner wall of the flame tube to be heated into oil mist; oil mist enters the fuel oil nozzle through the oil mist flowing channel and is finally ejected to a corresponding place, high-temperature gas in the corrugated gas path channel enters the swirler through a straight gas path channel pipeline to be subjected to rotary jet flow, and a high-temperature backflow area is formed to facilitate oil mist ignition and flame propagation. The wall face of the flame tube is effectively cooled, heat of the wall face of the flame tube is effectively utilized, and fuel oil is fully atomized. According to the fuel oil pre-evaporation flame tube, stable combustion of fuel oil under the low working condition can be achieved, the combustion efficiency of the fuel oil is improved, and the combustion condition is improved.

Description

Technical Field

[0001] The utility model relates to the field of gas turbine combustion chambers, in particular to a fuel pre-evaporation flame tube. Background Art

[0002] Fuel atomization and evaporation are key factors affecting gas turbine performance, including combustion efficiency, high-altitude reignition, lean flameout limits, and pollutant emissions. Aviation gas turbines typically use aviation kerosene as fuel. The nozzle atomizes the kerosene under high pressure, causing it to evaporate and mix with the air. However, in traditional combustor designs, some of the atomized fuel remains unvaporized and burns, impacting overall combustor performance. This performance needs to be improved.

[0003] As one of the most important components in a gas turbine, the combustion chamber needs to withstand a huge heat load and thermal shock on the inner wall of the flame tube under high-temperature combustion conditions. The working environment is also very harsh. Excessively high wall temperature of the flame tube will cause erosion inside the flame tube. The current cooling method mainly introduces cooling gas from the cooling holes on the flame tube wall to form an air film on the inner wall of the flame tube. These cooling methods that mainly consume a lot of air are increasingly difficult to adapt to the development needs of high-performance aircraft engines. Therefore, how to reasonably reduce the wall temperature of the combustion chamber flame tube within a certain range is particularly important. Ensuring its working reliability and life is a problem that needs to be solved in the design of the gas turbine combustion chamber flame tube. Utility Model Content

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and propose a flame tube with fuel pre-evaporation, specifically: an air supply port is set on the outer ring of the flame tube, and the cooling air absorbs heat and cools the flame tube wall through the curved air path to form high-temperature gas and enters the corrugated air path at a certain inclination, and the fuel is supplied to the annular oil storage tank, and the fuel is heated into oil mist by the temperature of the wall of the corrugated air path and the temperature of the inner wall of the flame tube, and the oil mist enters the fuel nozzle through the oil mist flow channel and is finally guided to the corresponding location, and the high-temperature gas in the corrugated air path is rotated through the straight air path pipeline to the swirler to form a high-temperature reflux zone, which is conducive to the ignition of oil mist and flame propagation. This flame tube with fuel pre-evaporation can realize stable combustion of fuel under low working conditions, achieve a combustion-supporting effect, improve the combustion efficiency of the fuel, improve the combustion condition, promote better combustion of the fuel, and also reduce the temperature of the flame tube wall, thereby realizing effective energy utilization.

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

[0006] A flame tube for pre-evaporation of fuel, characterized in that it includes a flame tube outer ring, a flame tube inner ring, an air supply port, a curved air path channel, a corrugated air path channel, an annular oil storage tank, an oil mist flow channel, a fuel nozzle, a straight air path channel, and a swirler, wherein the corrugated air path channel is located in the annular oil storage tank, and the straight air path channel is located in the oil mist flow channel.

[0007] Preferably, the air supply port is circular.

[0008] Preferably, the curved air passage forms an angle with the corrugated air passage, and forms an angle of 30° to 40° with the inlet axis direction. The number of the curved air passages is 20 to 30, and the width of the air passage is determined according to actual conditions.

[0009] Preferably, the corrugated air passage is located on the same concentric circle as the axis of the annular oil storage tank, and the minimum gap between the corrugated air passage and the annular oil storage tank is 3 mm, and the maximum gap is 7 mm.

[0010] Preferably, there are three straight air passages and three oil mist flow passages, and the gap between the straight air passages and the oil mist flow passages is 3 mm.

[0011] The beneficial effects of the utility model are:

[0012] (1) An air supply port is set on the outer ring of the flame tube. The cooling air absorbs heat and cools the flame tube wall through the curved air path to form high-temperature gas. Compared with traditional air film cooling, it avoids the adverse effect of the viscous bottom layer of the air flow on the thermal conductivity and realizes effective cooling of the flame tube wall.

[0013] (2) High-temperature gas passes through the corrugated gas channel, and the fuel is supplied to the annular oil storage tank. The temperature of the corrugated gas channel wall and the temperature of the inner wall of the flame tube heat the fuel into oil mist. Compared with the traditional evaporator tube, the heat exchange area and thermal conductivity are increased, and the effective utilization of the heat of the flame tube wall and the sufficient atomization effect of the fuel are achieved.

[0014] (3) The oil mist enters the fuel nozzle through the oil mist flow channel and is finally directed to the corresponding location. The high-temperature gas in the corrugated gas channel is transported through the straight gas channel to the swirler to form a rotating jet, forming a high-temperature reflux area that is beneficial to the ignition of the oil mist and the propagation of the flame. This fuel pre-evaporation flame tube can realize the stable combustion of the fuel under low working conditions, achieve the combustion-supporting effect, improve the combustion efficiency of the fuel, and improve the combustion condition. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0016] Figure 1 Overall schematic diagram of a fuel pre-evaporation flame tube

[0017] Figure 2 Overall perspective view of a fuel pre-evaporation flame tube

[0018] Figure 3 Cross-sectional view of a flame tube for fuel pre-evaporation

[0019] Figure 4 for Figure 3 Enlarged view of point A in the middle

[0020] Figure 5 for Figure 3 Enlarged view of point B in the middle

[0021] Figure 6 for Figure 1 XX cross-sectional view

[0022] In the figure: 1-flame tube outer ring, 2-flame tube inner ring, 3-air supply port, 4-elbow air path channel, 5-corrugated air path channel, 6-oil storage tank oil supply port, 7-annular oil storage tank, 8-oil mist flow channel, 9-fuel nozzle, 10-straight pipe air path channel, 11-swirler, 12-mixing hole, 13-afterburning hole, 14-cooling hole. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0024] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or a component or structure referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0025] Combine Figure 1 An overall schematic diagram of a fuel pre-evaporation flame tube. Figure 2 An overall perspective view of a fuel pre-evaporation flame tube. Figure 3 A cross-sectional view of a fuel pre-evaporation flame tube. Figure 4 for Figure 3 A magnified image in the middle. Figure 5 for Figure 3 The enlarged image of point B in the middle, Figure 6 for Figure 1 The XX cross-sectional view realizes a flame tube with fuel pre-evaporation. The utility model uses cooling air to effectively cool the flame tube wall, effectively utilizes the heat of the flame tube wall and realizes sufficient atomization effect of the fuel. While ensuring stable combustion of the fuel, it improves the combustion efficiency of the fuel, improves the combustion condition of the combustion chamber, and meets the requirements of high efficiency and high utilization.

[0026] Specifically, the outer ring 1 of the flame tube is provided with multiple air supply ports 3. After passing through the air supply ports 3, the cooling air absorbs heat from the flame tube wall through the curved air channel 4 and cools it down to form high-temperature gas. The high-temperature gas enters the corrugated air channel 5 at a certain inclination. The fuel flows into the annular oil storage tank 7 through the oil storage tank supply port 6. The high-temperature gas in the corrugated air channel 5 releases heat to the annular oil storage tank 7. The fuel absorbs heat from the wall of the corrugated air channel 5 and the inner wall of the flame tube and is heated into oil mist. The oil mist enters the fuel nozzle 9 through the oil mist flow channel 8 and is finally directed to the corresponding location. The high-temperature gas in the corrugated air channel 5 passes through the straight air channel 10 and further heats and atomizes the oil mist in the oil mist flow channel 8. The high-temperature gas flows to the swirler 11 as a rotating jet, forming a high-temperature recirculation zone that is conducive to the ignition of the oil mist and the propagation of the flame. The air flowing into the mixing hole 12 and the afterburning hole 13 provides an oxidant for the combustion reaction. The cooling air flowing into the cooling hole 14 helps to reduce the temperature of the flame tube. This fuel pre-evaporation flame tube can achieve stable combustion of fuel under low working conditions, achieve a combustion-supporting effect, improve the combustion efficiency of the fuel, improve the combustion conditions, promote better combustion of the fuel, and also reduce the temperature of the flame tube wall, realizing effective utilization of energy.

[0027] Matters not covered in this utility model are known technologies.

[0028] The above embodiments are intended only to illustrate the technical concepts and features of the present invention. Their purpose is to enable those familiar with the art to understand the contents of the present invention and implement them accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications based on the spirit of the present invention are intended to be included in the scope of protection of the present invention.

Claims

1. A flame tube for pre-evaporation of fuel, characterized by: It includes a flame tube outer ring, a flame tube inner ring, an air supply port, a curved air path channel, a corrugated air path channel, an annular oil storage tank, an oil mist flow channel, a fuel nozzle, a straight air path channel, and a swirler. The corrugated air path channel is located in the annular oil storage tank, and the straight air path channel is located in the oil mist flow channel.

2. The flame tube for pre-evaporation of fuel according to claim 1, characterized in that: The curved air passage forms an angle with the corrugated air passage, and forms an angle of 30° to 40° with the inlet axis direction. The number of the curved air passages is 20 to 30, and the width of the air passage is determined according to actual conditions.

3. The flame tube for pre-evaporation of fuel according to claim 1, characterized in that: The corrugated air passage is located on the same concentric circle as the axis of the annular oil storage tank. The minimum gap between the corrugated air passage and the annular oil storage tank is 3 mm, and the maximum gap is 7 mm.

4. The flame tube for pre-evaporation of fuel according to claim 1, characterized in that: There are three straight tube air passages and three oil mist flow passages, and the gap between the straight tube air passages and the oil mist flow passages is 3 mm.

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