Weakly-swirling premixed pre-vaporized low-emission combustor

Abstract

The application relates to a weak-rotation-flow premixing and pre-evaporation low-emission combustion chamber which comprises an air inlet channel, an oil conveying pipe, an annular-rotation-flow premixing and pre-evaporation chamber, a flame tube, an igniter and an air outlet channel, the air inlet channel and the oil conveying pipe are connected with the annular-rotation-flow premixing and pre-evaporation chamber, the annular-rotation-flow premixing and pre-evaporation chamber is sequentially connected with the flame tube and the air outlet channel, the igniter is arranged on the flame tube, and the annular-rotation-flow premixing and pre-evaporation chamber is provided with a plurality of axial screen holes and radial screen holes. The annular-rotation-flow premixing and pre-evaporation chamber is integrally packaged with the flame tube, the advantages of the two are combined, the working medium pre-evaporation, premixing and combustion functions are simultaneously achieved, the fuel completes evaporation and mixing with air in the same component, the structure is compact, the volume of the combustion chamber is reduced while the performance and environmental protection characteristics are considered, the gas working medium density is more uniform, the combustion chamber performance is improved, and the emission amount of pollutants such as nitrogen oxides is effectively reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of premixed and pre-vaporized combustion chambers, and particularly relates to a weakly-swirling premixed and pre-vaporized low-emission combustion chamber. BACKGROUND

[0002] With the increasing concern of people for living environment and health, people pay more attention to various pollution sources which harm their own health and destroy the environment and carry out strict control. In recent years, gas turbine engines have made remarkable progress in pursuit of large power and high thrust-to-weight ratio. However, with the continuous increase of combustion chamber inlet temperature, inlet pressure and temperature rise, the exhaust pollution problem is becoming increasingly serious. Although the proportion of aviation engines and industrial gas turbines in the total amount of combustion pollutant emissions is very small, due to their local characteristics, such as gathering high concentration of pollution emissions near the airport and the place where industrial gas turbines are used. In the air, various aircraft produce pollution emissions which are the only source of high-altitude atmospheric pollutants. Therefore, the emissions of gas turbines are subject to increasingly stringent restrictions, especially for the emissions of nitrogen oxides (NO X ) and the like, environmental protection requirements are becoming more and more stringent, which brings challenges to the design and use of gas turbine engines. The weakly-swirling premixed combustion technology has the characteristics of high combustion efficiency, compact combustion chamber structure, high outlet temperature field quality of combustion chamber, low NO X , low CO emission and the like, and is considered to be the most potential and promising combustion method among many low-emission schemes of gas turbines. The fuel and part of the air of the weakly-swirling premixed and pre-vaporized combustion chamber are first vaporized and mixed in the premixed and pre-vaporized device to form a relatively uniform oil-gas mixture, and then enter the flame tube. The local area of the combustion chamber flame tube works under the condition of more lean oil than the traditional combustion chamber, and the flame temperature is lower, thereby reducing the NOx emission level. Therefore, it is very important to develop a weakly-swirling premixed and pre-vaporized low-emission combustion chamber to reduce pollutant emissions. SUMMARY

[0003] In view of the above problems, the present application provides a weakly-swirling premixed and pre-vaporized low-emission combustion chamber, which has smaller volume, higher working efficiency, stable combustion organization and can reduce the emission of nitrogen oxides and the like compared with the traditional combustion chamber, and adopts the following technical scheme:

[0004] The application provides a weak-rotation-premixing-pre-vaporization low-emission combustion chamber, which comprises an air inlet channel, an oil conveying pipe, an annular-rotation-premixing-pre-vaporization chamber, a flame tube, an igniter and an air outlet channel, the air inlet channel and the oil conveying pipe are connected with the annular-rotation-premixing-pre-vaporization chamber, the annular-rotation-premixing-pre-vaporization chamber is sequentially connected with the flame tube and the air outlet channel, and the igniter is arranged on the flame tube, characterized in that the annular-rotation-premixing-pre-vaporization chamber is provided with a plurality of axial screen holes and radial screen holes; the air entering from the air inlet channel enters the annular-rotation-premixing-pre-vaporization chamber from the axial screen holes and the radial screen holes respectively, the fuel enters the annular-rotation-premixing-pre-vaporization chamber from the oil conveying pipe, is gasified under the action of the air entering from the axial screen holes, is uniformly mixed with the weak-rotation air current formed by the air entering from the radial screen holes, enters the flame tube, is ignited through the igniter, and the generated emissions are discharged from the air outlet channel.

[0005] By adopting the technical scheme, the liquid fuel is evaporated into gaseous fuel in the annular-rotation-premixing-pre-vaporization chamber by using the high-temperature gas working medium, and the gaseous fuel is mixed with the gas working medium under the action of the rotation to form the relatively uniform premixed gas entering the flame tube, which is helpful for the subsequent combustion in the combustion chamber. The application provides a weak-rotation-premixing-pre-vaporization low-emission combustion chamber, which integrates the annular-rotation-premixing-pre-vaporization chamber and the flame tube, combines the advantages of both, has the working medium pre-vaporization, pre-mixing and combustion functions, and the fuel is evaporated and mixed with the air in the same component, so that the structure is compact, the volume of the combustion chamber is reduced while the performance and environmental protection characteristics are considered, the density of the gas working medium is more uniform, the performance of the combustion chamber is improved, the local area of the flame tube of the combustion chamber can work under the condition of more lean oil, the flame temperature is lower, and therefore the emission amount of pollutants such as nitrogen oxides is effectively reduced.

[0006] Preferably, the annular-rotation-premixing-pre-vaporization chamber comprises an outer casing and an inner casing arranged at the front end of the inner casing, the axial screen holes and the radial screen holes are arranged on the front side of the outer casing, the axial screen holes are distributed within the front end surface of the inner casing, and the radial screen holes are distributed within the plane where the rear end surface of the inner casing is located, so that the air entering from the axial screen holes is separated from the air entering from the radial screen holes by the inner casing.

[0007] By adopting the technical scheme, the air entering from the axial screen holes provides high temperature for the fuel to evaporate and mix into a certain equivalence ratio, and controls the advancing direction, the air entering from the radial screen holes provides a weak-rotation air current for the annular-rotation-premixing-pre-vaporization chamber, so that the fuel and the air are uniformly mixed, the required equivalence ratio is reached, and the subsequent combustion in the flame tube is facilitated.

[0008] Preferably, the inner casing has a cross-section that is first reduced and then expanded.

[0009] By using the above technical solution, the fuel is beneficial to be spread, moved and uniformly mixed with air, which is helpful for the combustion in the subsequent flame tube and improves the combustion efficiency.

[0010] Preferably, the front end of the inner casing is communicated with the outlet of the oil delivery pipe.

[0011] By using the above technical solution, the fuel ejected from the oil delivery pipe and the air entering from the axial screen hole enter the inner casing together, and the fuel is changed from liquid state to gaseous state under the action of high-temperature gas flow and continues to move.

[0012] Preferably, the cross-section of the annular cyclone premixing and pre-evaporation chamber is smaller than that of the air inlet channel, the annular cyclone premixing and pre-evaporation chamber is embedded inside the air inlet channel, and there is a gap between the outer wall of the annular cyclone premixing and pre-evaporation chamber and the inner wall of the air inlet channel, so that part of the air can enter the annular cyclone premixing and pre-evaporation chamber from the radial screen hole.

[0013] By using the above technical solution, conditions are provided for the weak swirl of air entering the annular cyclone premixing and pre-evaporation chamber from the radial screen hole, and the overall structure of the combustion chamber is more compact.

[0014] Preferably, the length of the weak swirl premixing and pre-evaporation combustion chamber is 625 mm, the air inlet channel is cylindrical with a length of 225 mm and a diameter of 125 mm, the flame tube is cylindrical with a length of 300 mm and a diameter of 180 mm, and the air outlet channel is a circular truncated cone with a length of 100 mm, a front end face diameter of 125 mm and a rear end face diameter of 180 mm.

[0015] Preferably, the igniter is arranged on the side wall of the flame tube.

[0016] Preferably, the weak swirl premixing and pre-evaporation low-emission combustion chamber is a single-cylinder combustion chamber.

[0017] By using the above technical solution, only one flame tube is arranged as a combustion area in the traditional single-cylinder combustion chamber, and no mechanical structure is needed to form flameless combustion. The flameless combustion is realized while the temperature of the combustion products is more uniform, the combustion performance is optimized, and the emission of pollutants such as nitrogen oxides is reduced.

[0018] Preferably, the temperature of the air entering the air inlet channel is ≥700K.

[0019] By using the above technical solution, high temperature provides conditions for the gasification of fuel, and liquid fuel is changed into gaseous fuel.

[0020] In summary, the application relates to a weak swirl premixing and pre-vaporization low emission combustor, which comprises an air inlet channel, an oil delivery pipe, an annular swirler premixing and pre-vaporization chamber, a flame tube, an igniter and an air outlet channel. The air entering the air inlet channel enters the annular swirler premixing and pre-vaporization chamber from the axial screen hole and the radial screen hole, respectively. The fuel enters the annular swirler premixing and pre-vaporization chamber from the oil delivery pipe, is gasified under the action of the air entering from the axial screen hole, and is uniformly mixed with the weak swirl airflow formed by the air entering from the radial screen hole, and then enters the flame tube. After being ignited by the igniter, the generated emissions are discharged from the air outlet channel. The annular swirler premixing and pre-vaporization chamber is integrated and packaged with the flame tube, the advantages of the two are combined, the working medium pre-vaporization, premixing and combustion functions of the combustor are simultaneously realized, the fuel is vaporized and mixed with air in the same component, the structure is small and compact, the volume of the combustor is reduced while the performance and environmental protection characteristics are taken into account, and the gas working medium density is more uniform. The local area of the flame tube can work under the condition of leaner oil than the traditional combustor, thereby effectively improving the fuel combustion efficiency and reducing the emission of pollutants. BRIEF DESCRIPTION OF DRAWINGS

[0021] The accompanying drawings are included to provide a further understanding of embodiments and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments and, together with the description, serve to explain principles of the application. Other embodiments and many of the intended advantages of the present application will be readily appreciated as the same becomes better understood by reference to the following detailed description. The elements of the drawings are not necessarily to scale. Like reference numerals designate corresponding similar parts throughout.

[0022] Figure 1 is a structural schematic diagram of a weak swirl premixing and pre-vaporization low emission combustor according to an embodiment of the application.

[0023] Figure 2 is a structural schematic diagram of a weak swirl premixing and pre-vaporization low emission combustor according to an embodiment of the application from another angle.

[0024] Figure 3 is a temperature distribution diagram of the interior of the combustor obtained by simulation calculation according to an embodiment of the application.

[0025] Figure 4 is a mass flow distribution diagram of the fuel obtained by simulation calculation according to an embodiment of the application.

[0026] Figure 5 is a pressure distribution diagram of the interior of the combustor obtained by simulation calculation according to an embodiment of the application.

[0027] BRIEF DESCRIPTION OF DRAWINGS 1. air inlet channel; 2. oil delivery pipe; 3. annular swirler premixing and pre-vaporization chamber; 4. flame tube; 5. air outlet channel; 6. igniter. DETAILED DESCRIPTION

[0028] The application will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the related application, and not to limit the application. In addition, it should be noted that only the parts related to the application are shown in the drawings for ease of description.

[0029] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and embodiments.

[0030] Figure 1 is a structural schematic diagram of a weak swirl premixing and pre-vaporization low emission combustion chamber according to an embodiment of the present application, Figure 2 is a structural schematic diagram of a weak swirl premixing and pre-vaporization low emission combustion chamber according to another embodiment of the present application, referring to Figure 1 and Figure 2 A weak swirl premixing and pre-vaporization low emission combustion chamber according to an embodiment of the present application includes an air inlet channel 1, an oil delivery pipe 2, an annular swirl premixing and pre-vaporization chamber 3, a flame tube 4, an igniter 6, and an air outlet channel 5. The air inlet channel 1 and the oil delivery pipe 2 are both connected to the annular swirl premixing and pre-vaporization chamber 3. The annular swirl premixing and pre-vaporization chamber 3 is sequentially connected to the flame tube 4 and the air outlet channel 5. The igniter 6 is arranged on the flame tube 4. The annular swirl premixing and pre-vaporization chamber 3 is provided with a plurality of axial screen holes and radial screen holes. The air entering from the air inlet channel 1 enters the annular swirl premixing and pre-vaporization chamber 3 through the axial screen holes and the radial screen holes. The fuel enters the annular swirl premixing and pre-vaporization chamber 3 from the oil delivery pipe 2, is gasified under the action of the air entering from the axial screen holes, and is uniformly mixed with the weak swirl airflow formed by the air entering from the radial screen holes. The mixture enters the flame tube 4, is ignited by the igniter 6, and the generated emissions are discharged from the air outlet channel 5. The high-temperature gas working medium is used to change the liquid fuel into gaseous fuel in the annular swirl premixing and pre-vaporization chamber 3, and the gas working medium and the gaseous fuel are mixed and vaporized to become premixed gas under the action of the swirl, which is helpful for combustion in the subsequent combustion chamber. The present application provides a weak swirl premixing and pre-vaporization low emission combustion chamber, which integrates the annular swirl premixing and pre-vaporization chamber 3 and the flame tube 4, combines the advantages of both, has the functions of working medium pre-vaporization, premixing, and combustion, and completes the vaporization of the fuel and the mixing of the fuel and air in the same component. The structure is compact, the volume of the combustion chamber is reduced while the performance and environmental protection characteristics are taken into account, the density of the gas working medium is more uniform, the performance of the combustion chamber is improved, and the emission of pollutants such as nitrogen oxides is effectively reduced.

[0031] In a preferred embodiment, the length of the weakly swirling premixing and pre-vaporization combustion chamber is 625 mm, the length of the air inlet channel 1 is 225 mm, and the diameter is 125 mm; the length of the flame tube 4 is 300 mm, and the diameter is 180 mm; the length of the air outlet channel 5 is 100 mm, the diameter of the front end surface is 125 mm, and the diameter of the rear end surface is 180 mm; the annular swirling premixing and pre-vaporization chamber 3 comprises a pre-vaporization chamber and a premixing chamber, and the length of the premixing chamber is 78 mm.

[0032] In a specific embodiment, the annular swirling premixing and pre-vaporization chamber 3 comprises an outer casing and an inner casing arranged at the front end inside the outer casing, the axial screen holes and the radial screen holes are arranged at the front side of the outer casing, and the axial screen holes are distributed within the range of the front end surface of the inner casing, and the radial screen holes are distributed within the range of the plane where the rear end surface of the inner casing is located, so that the axial air entering the inner casing is separated from the radial air entering the inner casing. The air entering from the axial screen holes provides high temperature for the fuel to vaporize and gasify, while controlling the direction of the air. The air entering from the radial screen holes provides weak swirling flow for the annular swirling premixing and pre-vaporization chamber 3, so that the fuel and air are uniformly mixed, the required equivalence ratio is achieved, and the subsequent combustion in the flame tube 4 is facilitated.

[0033] In a specific embodiment, the inner casing has a cross section that is first reduced and then expanded, which is conducive to the dispersion, movement of the fuel, and the mixing of the fuel and air.

[0034] In a specific embodiment, the front end of the inner casing is connected to the outlet of the oil delivery pipe 2, so that the fuel sprayed from the oil delivery pipe 2 and the air entering from the axial screen holes enter the inner casing together, and the fuel changes from liquid to gas under the action of high-temperature airflow and continues to move.

[0035] In a specific embodiment, the cross section of the annular swirling premixing and pre-vaporization chamber 3 is smaller than the cross section of the air inlet channel 1, the annular swirling premixing and pre-vaporization chamber 3 is embedded inside the air inlet channel 1, and there is a gap between the outer wall of the annular swirling premixing and pre-vaporization chamber 3 and the inner wall of the air inlet channel 1, so that part of the air can enter the annular swirling premixing and pre-vaporization chamber 3 from the radial screen holes, and the overall structure of the combustion chamber is more compact.

[0036] In a specific embodiment, the annular swirling premixing and pre-vaporization chamber 3 comprises a pre-vaporization chamber at the front end and a premixing chamber at the rear end, the inner casing is arranged in the pre-vaporization chamber, and the pre-vaporization of the liquid fuel occurs under the action of high-temperature axial airflow. The premixing chamber is at the rear end of the pre-vaporization chamber, the airflow entering from the radial screen holes generates weak swirling flow, and mixes with the gas from the pre-vaporization chamber to form a relatively uniform premixed gas.

[0037] In a specific embodiment, the igniter 6 is arranged on the side wall of the flame tube 4.

[0038] In one specific embodiment, the weakly-swirling premixed pre-vaporized low-emission combustor is a single-cylinder combustor, i.e. only one flame tube 4 is provided as the combustion area. By using a conventional single-cylinder combustor, no mechanical structure needs to be added for forming flameless combustion, the combustion product temperature is more uniform while realizing flameless combustion, the combustion performance is optimized, and the emission of pollutants such as nitrogen oxides is reduced.

[0039] In one specific embodiment, the temperature of the air entering the air inlet channel 1 is ≥ 700 K, which provides conditions for the gasification of the fuel, and the liquid fuel is converted into gaseous fuel.

[0040] In one specific embodiment, a nozzle is provided at the outlet of the oil delivery pipe 2 to atomize the fuel, which helps its gasification.

[0041] In one specific embodiment, the fuel entering from the oil delivery pipe 2 is kerosene.

[0042] The implementation principle of the weak swirl premixing and pre-evaporation low emission combustion chamber according to an embodiment of the present application is as follows: the combustion chamber comprises an air inlet channel 1, an oil delivery pipe 2, an annular swirl premixing and pre-evaporation chamber 3, a flame tube 4, an igniter 6 and an air outlet channel 5, the oil delivery pipe 2 is connected to the front end of the annular swirl premixing and pre-evaporation chamber 3, the air inlet channel 1, the annular swirl premixing and pre-evaporation chamber 3, the flame tube 4 and the air outlet channel 5 are connected in sequence, and the igniter 6 is arranged on the flame tube 4. The annular swirl premixing and pre-evaporation chamber 3 is embedded in the shell of the air inlet channel 1, and comprises an outer casing and an inner casing arranged at the front end inside the outer casing. The front side of the outer casing is provided with axial screen holes and radial screen holes, the axial screen holes are distributed within the range of the front end surface of the inner casing, and the radial screen holes are distributed within the range of the plane where the rear end surface of the inner casing is located. The inner casing has a shape with a cross section that is first reduced and then expanded. In operation, fuel enters the inner casing of the annular swirl premixing and pre-evaporation chamber 3 from the oil delivery pipe 2, and air enters from the air inlet channel 1 and is divided into two air flows. One air flow enters the inner casing from the axial screen holes to provide high temperature for the fuel and control the advancing direction of the liquid working medium, and the other air flow enters the annular swirl premixing and pre-evaporation chamber 3 from the radial screen holes to provide a weak swirl air flow. The fuel entering the inner casing is mixed with the high-temperature air flow entering from the axial screen holes and vaporized and gasified at a required temperature, and then is uniformly mixed with the weak swirl air flow formed by the air entering from the radial screen holes to form an oil-gas mixture with a required equivalence ratio, which enters the flame tube 4, is ignited by the igniter 6, and then the combustion generated emissions are discharged from the air outlet channel 5. The weak swirl premixing and pre-evaporation low emission combustion chamber integrates the annular swirl premixing and pre-evaporation chamber 3 and the flame tube 4, combines the advantages of both, has the functions of working medium pre-evaporation, premixing and combustion, and completes the evaporation of the fuel and the mixing of the fuel and air in the same component, so that the structure is compact, the volume of the combustion chamber is reduced while the performance and environmental protection characteristics are taken into account, the density of the gas working medium is more uniform, the performance of the combustion chamber is improved, the local area of the flame tube 4 can work under a leaner oil condition compared with the traditional combustion chamber, the flame temperature is lower, the temperature field quality at the outlet of the combustion chamber is high, and thus the emission amount of pollutants such as nitrogen oxides and carbon monoxide is effectively reduced.

[0043] To verify that the structure and size of the preferred embodiment have good combustion efficiency, the preferred embodiment is simulated. The combustion of the preferred embodiment is simulated by using a commercial software Fluent under certain fuel mass flow and air inlet conditions, and the temperature distribution diagram, gaseous kerosene density diagram and pressure distribution diagram of the simulation results are obtained, as shown in Figure 3 、 Figure 4 and Figure 5 .

[0044] From Figure 3It can be known from the figure that after the liquid kerosene is mixed with the high-temperature gas, the mixed gas reaches the flame tube for combustion, the highest temperature on the yz section is 1156.96 K, and the average temperature is 1101.87 K. Figure 4 It can be known from the figure that after the liquid kerosene is mixed with the high-temperature gas in the premixing and pre-vaporization chamber, the mixed gas of gaseous kerosene is formed, and the mass fraction of the gaseous kerosene on the yz section is 0.951%. Figure 5 It can be known from the figure that the high-temperature gas enters from the gas inlet, and due to the limited size of the sieve hole, the gas cannot pass through the sieve hole completely, so a high-pressure area is formed at the gas inlet, while the annular cyclone premixing and pre-vaporization chamber and the flame tube are low-pressure areas. Therefore, the combustion chamber of the application has the functions of working medium pre-vaporization, premixing and combustion, and can reduce the volume of the combustion chamber while taking into account the performance and environmental protection characteristics, the local area of the flame tube can work under the condition of leaner oil than the traditional combustion chamber, which can effectively improve the working efficiency and power, organize stable flameless combustion and reduce the emission of pollutants.

[0045] The specific embodiments of the application are described above, but the protection scope of the application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical range disclosed in the application, which should be covered in the protection scope of the application. Therefore, the protection scope of the application should be subject to the protection scope of the claims.

[0046] In the description of the application, it should be understood that the orientation or position relationship indicated by the terms "upper", "lower", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application. The word 'includes' does not exclude the existence of elements or steps not listed in the claims. The word 'one' or 'one' before an element does not exclude the existence of multiple such elements. The simple fact that certain measures are recorded in mutually different dependent claims does not mean that the combination of these measures cannot be used to improve. Any reference symbol in the claims should not be interpreted as limiting the scope.

Claims

1. A low-emission combustion chamber with weak swirling premixing and preevaporation, comprising an inlet channel, an oil supply pipe, an annular swirling premixing and preevaporation chamber, a flame tube, an igniter, and an outlet channel, wherein the inlet channel and the oil supply pipe are both connected to the annular swirling premixing and preevaporation chamber, the annular swirling premixing and preevaporation chamber is sequentially connected to the flame tube and the outlet channel, and the igniter is disposed on the flame tube, characterized in that: The annular cyclone premixing and preevaporation chamber is provided with multiple axial and radial screen holes. Air entering through the inlet channel enters the annular cyclone premixing and preevaporation chamber through both the axial and radial screen holes. Fuel enters the annular cyclone premixing and preevaporation chamber from the oil supply pipe, vaporizes under the action of air entering through the axial screen holes, and then mixes evenly with the weak swirling airflow formed by air entering through the radial screen holes. The mixture then enters the flame tube, is ignited by the igniter, and the resulting emissions are discharged through the outlet channel. The annular cyclone premixing and preevaporation chamber includes an outer casing and an inner casing located at the front end of the outer casing. The sieve holes and the radial sieve holes are arranged on the front side of the outer casing, and the axial sieve holes are distributed within a range not exceeding the front end face of the inner casing, and the radial sieve holes are distributed within a range not exceeding the plane where the rear end face of the inner casing is located, thereby separating the axially entering air from the radially entering gas through the inner casing; the cross-section of the annular cyclone premixing and preevaporating chamber is smaller than the cross-section of the air inlet channel, the annular cyclone premixing and preevaporating chamber is embedded inside the air inlet channel, and there is a gap between the outer wall of the annular cyclone premixing and preevaporating chamber and the inner wall of the air inlet channel, so that some air can enter the annular cyclone premixing and preevaporating chamber through the radial sieve holes.

2. The low-emission combustion chamber with weak swirl premixing and preevaporation according to claim 1, characterized in that: The inner casing has a cross-section that first narrows and then expands.

3. The low-emission combustion chamber with weak swirl premixing and preevaporation according to claim 1, characterized in that: The front end of the inner casing is connected to the outlet of the oil supply pipe.

4. The low-emission combustion chamber with weak swirl premixing and preevaporation according to claim 1, characterized in that: The weak swirling premixed pre-evaporation combustion chamber has a total length of 625mm. The air inlet channel is cylindrical, with a length of 225mm and a diameter of 125mm. The flame tube is cylindrical, with a length of 300mm and a diameter of 180mm. The air outlet channel is frustum-shaped, with a length of 100mm, a front end diameter of 125mm, and a rear end diameter of 180mm.

5. The low-emission combustion chamber with weak swirl premixing and preevaporation according to claim 1, characterized in that: The igniter is located on the side wall of the flame tube.

6. The low-emission combustion chamber with weak swirl premixing and preevaporation according to claim 1, characterized in that: The weak swirling premixed preevaporation low-emission combustion chamber is a single-tube combustion chamber.

7. The low-emission combustion chamber with weak swirl premixing and preevaporation according to claim 1, characterized in that: The air temperature entering the air inlet channel is ≥700K.

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