Fuel oil pre-evaporation flame tube

Abstract

According to the fuel oil pre-evaporation flame tube, the gas supply opening 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, a high-temperature backflow area is formed, oil mist ignition and flame propagation are facilitated, compared with a traditional flame tube, the wall face of the flame tube is effectively cooled, and the service life of the flame tube is prolonged. And the heat of the wall surface of the flame tube is effectively utilized, and the 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 invention belongs to the field of gas turbine combustion chambers, and in particular relates to a flame tube for pre-evaporation of fuel oil. Background Art

[0002] The atomization and evaporation effects of fuel are key factors affecting the performance of gas turbines, including combustion efficiency, high-altitude re-ignition, lean flameout limit, and pollutant emissions. Aviation gas turbines generally 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 combustion chamber designs, part of the fuel is not completely evaporated after atomization and is burned, which affects the overall performance of the combustion chamber. The performance of the combustion chamber needs to be improved.

[0003] As one of the most important parts of 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 conditions of combustion. The working environment is also very harsh. Excessively high wall temperature of the flame tube will cause ablation 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 the reliability of the work and its life is a problem that needs to be solved in the current design of the gas turbine combustion chamber flame tube. Summary of the invention

[0004] The present invention mainly relates to a flame tube with fuel pre-evaporation in the technical field of a gas turbine combustion chamber, specifically: an air supply port is arranged on the outer ring of the flame tube, cooling air absorbs heat and cools the flame tube wall through a curved air path channel to form high-temperature gas and enters the corrugated air path channel at a certain inclination, the fuel is supplied to an annular oil storage tank, the fuel is heated into oil mist by the temperature of the wall of the corrugated air path channel and the temperature of the inner wall of the flame tube, the oil mist enters the fuel nozzle through the oil mist flow channel and is finally ejected to a corresponding location, the high-temperature gas in the corrugated air path channel is transported to a swirling jet from a straight air path channel pipeline to a swirler, forming a high-temperature reflux zone which is beneficial to the ignition of the oil mist and the propagation of the flame, the flame tube with fuel pre-evaporation can realize stable combustion of the 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 utilization of energy.

[0005] Technical Solution

[0006] The purpose of the present invention is to realize a flame tube for pre-evaporation of fuel oil.

[0007] The technical solution of the present invention is as follows:

[0008] 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.

[0009] The air supply port is circular.

[0010] The curved pipe gas path channel is at an angle to the corrugated gas path channel, and is at an angle of 30° to 40° to the inlet axis direction. The number of curved pipe gas paths is 20 to 30, and the width of the gas path channel is determined according to actual conditions.

[0011] The corrugated air passage is located on the same concentric circle of 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.

[0012] 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.

[0013] The present invention has the following beneficial effects:

[0014] (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 channel to form high-temperature gas. Compared with traditional air film cooling, it avoids the adverse effect of the air flow viscosity bottom layer on the thermal conductivity and realizes effective cooling of the flame tube wall. (2) The high-temperature gas passes through the corrugated air channel, and the fuel is supplied to the annular oil storage tank. The temperature of the corrugated air channel wall and the temperature of the flame tube inner wall heat the fuel into oil mist. Compared with the traditional evaporator, 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 realized. (3) The oil mist enters the fuel nozzle through the oil mist flow channel and is finally guided to the corresponding location. The high-temperature gas in the corrugated air channel is transported to the swirler through the straight air channel pipeline to form a rotating jet, forming a high-temperature reflux zone that is conducive to the ignition of oil mist and flame propagation. This fuel pre-evaporation flame tube can realize stable combustion of fuel under low working conditions, achieve a combustion-supporting effect, improve the combustion efficiency of fuel, and improve the combustion condition. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 An overall schematic diagram of a flame tube for pre-evaporation of fuel

[0016] Figure 2 An overall perspective view of a flame tube for pre-evaporation of fuel

[0017] Figure 3 Cross-sectional view of a flame tube for pre-evaporation of fuel oil

[0018] Figure 4 for Figure 3 Enlarged view of point A

[0019] Figure 5 for Figure 3 Enlarged view of point B

[0020] Figure 6 for Figure 1 XX section view

[0021] 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-supplementary combustion hole, 14-cooling hole. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other implementation methods obtained by ordinary technicians in the field without creative work belong to the scope of protection of the present application.

[0023] The present invention will now be further described with reference to the accompanying drawings:

[0024] Combination Figure 1 An overall schematic diagram of a flame tube for pre-evaporation of fuel oil. Figure 2 An overall perspective view of a flame tube for pre-evaporation of fuel oil. Figure 3 A cross-sectional view of a flame tube for pre-evaporation of fuel oil. Figure 4 for Figure 3 The enlarged picture of A 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 invention 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.

[0025] Specifically, the outer ring 1 of the flame tube is provided with a plurality of air supply ports 3. After the cooling air passes through the air supply ports 3, it absorbs heat and cools the flame tube wall through the curved pipe air passage 4 to form high-temperature gas. The high-temperature gas enters the corrugated air passage 5 at a certain inclination. The fuel oil flows into the annular oil storage tank 7 through the oil storage tank supply port 6. The high-temperature gas in the corrugated air passage 5 releases heat to the annular oil storage tank 7. The fuel oil absorbs the heat from the wall of the corrugated air passage 5 and the inner wall of the flame tube and heats into oil mist. The oil mist enters the fuel nozzle 9 through the oil mist flow channel 8 and is finally guided to the corresponding location. The high-temperature gas in the corrugated air passage 5 passes through the straight pipe air passage 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 to rotate the jet, forming a high-temperature reflux zone that is conducive to the ignition of the oil mist and the propagation of the flame. The air flow flowing into the mixing hole 12 and the afterburning hole 13 provides a combustion aid for the combustion reaction, and the cooling air flow flowing into the cooling hole 14 assists in reducing the temperature of the flame tube. This fuel pre-evaporation flame tube can achieve stable combustion of fuel under low operating 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.

[0026] Matters not covered by the present invention are known technologies.

[0027] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. 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. 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 oil according to claim 1, characterized in that: The curved pipe gas path channel is at an angle to the corrugated gas path channel, and is at an angle of 30° to 40° to the inlet axis direction. The number of curved pipe gas paths is 20 to 30, and the width of the gas path channel is determined according to actual conditions.

3. The flame tube for pre-evaporation of fuel oil according to claim 1, characterized in that: The corrugated air passage is located on the same concentric circle of 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 oil 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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