Flame tube and combustion chamber having the same

Abstract

The present application relates to the technical field of engine combustion chamber, disclose a flame tube and have its combustion chamber, the flame tube is enclosed and is formed with combustion chamber and is equipped with air channel, the air channel includes air inlet and cooling flow channel, the air inlet and cooling flow channel are communicated, the air inlet is suitable for communicating with fuel pipeline;The flame tube comprises: end wall, located at one end of the combustion chamber, the air inlet is arranged in the end wall;Ring wall, which is connected with the end wall and surrounds the combustion chamber, and the cooling flow channel is arranged in the ring wall. The flame tube of the embodiment of the present application cools the combustion chamber by using fuel, reduces the cooling cost, and reduces the generation of thermal NOx.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of engine combustion chamber, in particular to a flame tube and a combustion chamber with the same. BACKGROUND

[0002] In the related art, the combustion chamber usually comprises a flame tube, fuel and air are introduced into the flame tube, the fuel and air are mixed and burned in the main combustion zone in the flame tube, but the temperature of the flame tube is high, not only the heat dissipation is needed, the cooling cost is increased, but also more thermal NOx (nitrogen oxide) is generated. SUMMARY

[0003] Therefore, the present application provides a flame tube and a combustion chamber with the same to solve the problems of high temperature of the flame tube and generation of more thermal NOx.

[0004] In a first aspect, the present application provides a flame tube, the flame tube is enclosed to form a combustion chamber and is provided with an air passage, the air passage comprises an air inlet and a cooling flow channel, the air inlet and the cooling flow channel are communicated, and the air inlet is adapted to be communicated with a fuel pipe; the flame tube comprises: an end wall located at one end of the combustion chamber, the air inlet is arranged on the end wall; a ring wall connected with the end wall and surrounding the combustion chamber, and the cooling flow channel is arranged in the ring wall.

[0005] Beneficial effects: the ring wall of the flame tube is provided with the cooling flow channel, the fuel flows to the air inlet through the fuel pipe, and then flows to the cooling flow channel from the air inlet, the fuel exchanges heat with the combustion chamber in the cooling flow channel, which can reduce the temperature of the combustion chamber, without the need to additionally set a cooling structure for the combustion chamber, thereby reducing the weight and cooling cost and reducing the generation of thermal NOx.

[0006] In an optional embodiment, the ring wall is two, one of the two ring walls is an inner ring wall and the other is an outer ring wall, the outer ring wall surrounds the inner ring wall, and the inner ring wall, the outer ring wall and the end wall enclose the combustion chamber; the air passage is two, one of the two air passages is an inner ring air passage and the other is an outer ring air passage, the cooling flow channel of the inner ring air passage is arranged in the inner ring wall, and the cooling flow channel of the outer ring air passage is arranged in the outer ring wall.

[0007] Beneficial effects: in the radial direction of the flame tube, the number of cooling flow channels is increased, and the heat exchange area of the overall cooling flow channel and the combustion chamber is larger, in unit time, a larger amount of fuel can exchange heat with the combustion chamber, the heat exchange efficiency is higher, and the cooling effect on the combustion chamber is better.

[0008] In an alternative embodiment, the end wall is provided with a converging flow channel, the converging flow channel being in communication with the cooling flow channels of the two air channels; the end wall is provided with an air through hole, the air through hole extending through the end wall along the axial direction of the flame tube, the air through hole being in communication with the combustion chamber and the converging flow channel.

[0009] Beneficial effects: the fuel in the two air channels can be mixed with the air in the air through hole, the fuel and air are premixed and then ignited in the combustion chamber, that is, the flame tube adopts premixed combustion, which can meet the requirements of fuel combustion for backfire inhibition and stable combustion, and the fuel is uniformly burned, the local reaction temperature is reduced, and the emission of NOx and other pollutants is reduced.

[0010] In an alternative embodiment, the end wall is provided with a plurality of injection flow channels, the air through hole is a plurality of air through holes, and the plurality of injection flow channels are in one-to-one correspondence with the plurality of air through holes, each injection flow channel being in communication with the converging flow channel; wherein the cross-sectional area of the injection flow channel is smaller than the cross-sectional area of the converging flow channel.

[0011] Beneficial effects: since the cross-sectional area of the injection flow channel is smaller than the cross-sectional area of the converging flow channel, the flow rate of the fuel in the injection flow channel is faster and the pressure is greater, and the fuel has a greater speed when flowing out of the injection flow channel, that is, the kinetic energy of the fuel is greater, avoiding the fuel from gathering at the outlet of the injection flow channel, and the fuel can move a greater distance in the air through hole, thereby enabling the fuel and the air in the air through hole to be fully mixed.

[0012] In an alternative embodiment, the cooling flow channels are a plurality of cooling flow channels, and the plurality of cooling flow channels are arranged at intervals along the axial direction of the flame tube.

[0013] Beneficial effects: along the circumferential direction of the flame tube, the number of cooling flow channels is increased, and the overall heat exchange area of the cooling flow channels with the combustion chamber is larger, so that a larger amount of fuel can be exchanged with the combustion chamber in unit time, the heat exchange efficiency is higher, and the cooling effect on the combustion chamber is better.

[0014] In an alternative embodiment, the air channel further comprises a distribution flow channel, the distribution flow channel being provided in the end wall and comprising: a circumferential segment extending along the circumferential direction of the flame tube, the air inlet being in communication with the circumferential segment along the circumferential direction of the flame tube; a plurality of radial segments in communication with the circumferential segment and extending along the radial direction of the flame tube, each radial segment being in communication with at least one cooling flow channel.

[0015] Beneficial effects: by dividing the distribution flow channel into a circumferential segment and a plurality of radial segments, the fuel of the air inlet can flow to the plurality of radial segments through the circumferential segment, and then be delivered to the plurality of cooling flow channels through the radial segments, thereby improving the convenience of fuel delivery.

[0016] In an alternative embodiment, the end wall is provided with an air through hole, and the cooling flow channel comprises: a first cooling section in communication with the air inlet and extending along the axial direction of the flame tube; a second cooling section in communication with the air through hole and extending along the axial direction of the flame tube; and a third cooling section in communication with the first cooling section and the second cooling section at two ends thereof.

[0017] Beneficial effects: By dividing the cooling flow channel into three sections, not only the communication between the air inlet and the air through hole is achieved, but also the extension size of the cooling flow channel on the ring wall is extended, the time of fuel flowing on the ring wall is increased, which is beneficial to improve the heat exchange efficiency of the fuel and the combustion chamber and more effectively reduce the temperature of the combustion chamber.

[0018] In an alternative embodiment, the cooling flow channel is at least two, the two cooling flow channels are arranged at intervals along the circumferential direction of the flame tube, and the two first cooling sections are arranged oppositely; wherein, along the circumferential direction of the flame tube, the air inlet is located between the two first cooling sections and communicates with the two first cooling sections.

[0019] Beneficial effects: Along the circumferential direction of the flame tube, the number of cooling flow channels is increased, and the heat exchange area of the whole cooling flow channel and the combustion chamber is larger, more fuel can be exchanged with the combustion chamber in unit time, the heat exchange efficiency is higher, and the cooling effect on the combustion chamber is better.

[0020] In an alternative embodiment, the ring wall is provided with a mixing hole, at least one mixing hole is arranged between the first cooling section and the second cooling section of the cooling flow channel; and / or, the ring wall is provided with a mixing hole, at least one mixing hole is arranged between adjacent first cooling sections; and / or, the ring wall is provided with a mixing hole, the mixing hole is closer to the end wall relative to the third cooling section; and / or, the ring wall is provided with a main combustion hole, at least one main combustion hole is arranged between adjacent first cooling sections.

[0021] Beneficial effects: The distance between the first cooling section and the second cooling section can be prevented from being too small, the cooling range of the cooling flow channel in the circumferential direction of the flame tube is larger, the space between the first cooling section and the second cooling section is effectively utilized, and the number of arranged mixing holes is increased. And the distance between adjacent first cooling sections can be prevented from being too small, the cooling range of the adjacent two cooling flow channels in the circumferential direction of the flame tube is larger, the space between adjacent first cooling sections is effectively utilized, and the number of arranged main combustion holes and mixing holes is increased.

[0022] In a second aspect, the present application further provides a combustion chamber, comprising: a casing; a fuel pipe arranged in the casing; and the flame tube according to the first aspect arranged in the casing.

[0023] Beneficial effects: fuel flows through the fuel pipe to the air inlet, and then flows from the air inlet to the cooling flow channel, the fuel exchanges heat with the combustion chamber in the cooling flow channel, which can reduce the temperature of the combustion chamber, without additional cooling structure for the combustion chamber, reducing the cooling cost, and reducing the generation of thermal NOx. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the specific embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0025] Figure 1 Figure 1 is a partial schematic view of a combustion chamber according to an embodiment of the present application;

[0026] Figure 2 Figure 2 is another partial schematic view of a combustion chamber according to an embodiment of the present application;

[0027] Figure 3 Figure 3 is a schematic view of a cooling flow channel of a flame tube according to an embodiment of the present application;

[0028] Figure 4 Figure 4 is a sectional view of an end wall of a flame tube according to an embodiment of the present application.

[0029] Legend of reference signs:

[0030] 1, flame tube; 2, casing; 3, fuel pipe; 31, main pipe; 32, inner ring pipe; 33, outer ring pipe; 4, combustion chamber;

[0031] 100, end wall; 110, air through hole; 120, injection flow channel; 130, distribution flow channel; 131, circumferential section; 132, radial section; 140, convergence flow channel;

[0032] 200, ring wall; 210, inner ring wall; 220, outer ring wall; 230, mixing hole; 240, main combustion hole;

[0033] 300, air passage; 310, air inlet; 320, cooling flow channel; 321, first cooling section; 322, second cooling section; 323, third cooling section;

[0034] 400, combustion chamber. DETAILED DESCRIPTION

[0035] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0036] In the related art, the fuel is usually stored in a liquid manner, and the fuel needs to enter the flame tube in a normal-temperature gaseous form. For example, in a hydrogen fuel aero-engine, the hydrogen fuel is stored in a liquid state at a temperature of 20K, and the temperature difference between the normal-temperature gaseous hydrogen fuel and the main combustion zone in the flame tube is about 280K. The hydrogen fuel has a very high mass heat value, and the adiabatic flame temperature is also very high. In the same oil-gas ratio state, the combustion temperature of the main combustion zone using hydrogen fuel is higher than that of the main combustion zone using aviation kerosene, which can cause more thermal NOx to be generated.

[0037] The embodiments of the present application will be described below with reference to the drawings. Figures 1 to 4 (in the drawings, the direction indicated by the dotted arrow is the flow direction of the fuel, and Figure 1 and Figure 2 The structure of the combustion chamber 4 is shown in FIG. 1 / 14), the embodiments of the present application will be described.

[0038] According to the embodiments of the present application, in one aspect, a flame tube 1 can be provided, which can be used in a hydrogen fuel aero-engine.

[0039] The flame tube 1 encloses a combustion cavity 400 and is provided with an air passage 300. The combustion cavity 400 can include a main combustion zone and a post-combustion zone, etc. The air passage 300 includes an air inlet 310 and a cooling flow passage 320, the air inlet 310 and the cooling flow passage 320 are communicated, and the air inlet 310 is adapted to be communicated with the fuel pipe 3.

[0040] The flame tube 1 includes an end wall 100 and a ring wall 200. The end wall 100 is located at one end of the combustion cavity 400, and the air inlet 310 is arranged on the end wall 100. The ring wall 200 is connected with the end wall 100 and surrounds the combustion cavity 400, and the cooling flow passage 320 is arranged in the ring wall 200.

[0041] That is, the fuel flows to the air inlet 310 through the fuel pipe 3, and then flows to the cooling flow passage 320 from the air inlet 310. The fuel exchanges heat with the combustion cavity 400 in the cooling flow passage 320, which can reduce the temperature of the combustion cavity 400. Without additional cooling structure for the combustion cavity 400, the weight and cooling cost are reduced, the generation of thermal NOx is reduced, and the proportion of air participating in combustion is increased. On the premise of ensuring flame stability, the equivalence ratio of the main combustion zone can be reduced, and the NOx emission can be greatly reduced.

[0042] In addition, the cooling flow channel 320 is directly configured on the flame tube 1, the cooling flow channel 320 is close to the combustion chamber 400, which is beneficial to improve the heat exchange efficiency of the fuel in the cooling flow channel 320 and the combustion chamber 400, and the integrated design reduces the processing difficulty and the processing cost.

[0043] In some embodiments, as shown in Figure 1 and Figure 2 The two ring walls 200 are an inner ring wall 210 and an outer ring wall 220, the outer ring wall 220 surrounds the inner ring wall 210, and the inner ring wall 210, the outer ring wall 220 and the end wall 100 enclose the combustion chamber 400; the two air channels 300 are an inner ring air channel and an outer ring air channel, the cooling flow channel 320 of the inner ring air channel is arranged on the inner ring wall 210, and the cooling flow channel 320 of the outer ring air channel is arranged on the outer ring wall 220.

[0044] In this way, in the radial direction of the flame tube 1, the number of cooling flow channels 320 is increased, and the heat exchange area of the cooling flow channel 320 as a whole and the combustion chamber 400 is larger, the inner ring side and the outer ring side of the combustion chamber 400 can exchange heat with the cooling flow channel 320, and in unit time, a larger amount of fuel can exchange heat with the combustion chamber 400, the heat exchange efficiency is higher, and the cooling effect on the combustion chamber 400 is better.

[0045] In some embodiments, as shown in Figure 4 The end wall 100 is provided with a flow collecting channel 140, the flow collecting channel 140 is in communication with the cooling flow channels 320 of the two air channels 300, the flow collecting channel 140 can extend in the radial direction of the flame tube 1, and the width of the flow collecting channel 140 can gradually increase from inside to outside in the radial direction of the flame tube 1. The end wall 100 is provided with an air through hole 110, the air through hole 110 penetrates the end wall 100 in the axial direction of the flame tube 1, the air through hole 110 is in communication with the combustion chamber 400 and the flow collecting channel 140, and air enters the combustion chamber 400 from the air through hole 110.

[0046] By arranging the flow collecting channel 140, the fuel in the two air channels 300 and the air in the air through hole 110 can be mixed, the fuel and the air are premixed before entering the combustion chamber 400 and are ignited, that is, the flame tube 1 adopts a premixed combustion combustion mode, which can meet the requirements of fuel combustion on backfire inhibition and stable combustion, effectively avoid backfire ablation, uniform fuel combustion, reduce local reaction temperature, and reduce the emission of NOx and other pollutants.

[0047] In addition, the flow collecting channel 140 is integrated on the flame tube 1 to realize the mixing of fuel and air, without the need to additionally arrange a premixing structure of fuel and air in the combustion chamber 4, which can reduce the size of the combustion chamber 4, reduce the processing difficulty, reduce the number of parts, and reduce the weight of the engine.

[0048] In addition, since the fuel and air have been premixed on the flame tube 1, the vortex finder can be omitted, and the weight and cost of the combustion chamber 4 can be reduced.

[0049] In some embodiments, as shown in FIG. 1, the end wall 100 is provided with a plurality of injection channels 120, and the air through holes 110 are also provided in plurality, and the plurality of injection channels 120 and the plurality of air through holes 110 are connected in one-to-one correspondence, and each injection channel 120 is connected between one air through hole 110 and the collecting channel 140. Figure 4

[0050] Specifically, the collecting channel 140 is provided with a plurality of injection channels 120 on each side in the circumferential direction of the flame tube 1, and the plurality of injection channels 120 on each side of the collecting channel 140 in the circumferential direction of the flame tube 1 are arranged in a radial direction of the flame tube 1.

[0051] By increasing the number of air through holes 110, the amount of air in the combustion chamber 400 can be ensured to be sufficient while reducing the cross-sectional area of the air through hole 110, and the radius of the air through hole 110 can be 2 mm, and the cross-sectional area of the injection channel 120 can be reduced, and the size of the injection channel 120 can be 0.5 mm x 1.0 mm. By adopting the structure of small-aperture multi-point injection, fuel backfire ablation can be effectively avoided, and the combustion stability can be improved.

[0052] In addition, the cross-sectional area of the injection channel 120 is smaller than that of the collecting channel 140. The flow rate of the fuel in the injection channel 120 is faster and the pressure is greater, and the fuel has a greater speed when flowing out of the injection channel 120, that is, the kinetic energy of the fuel is greater, and the fuel can change from liquid to gas after being injected out of the injection channel 120, avoiding the fuel from gathering at the outlet of the injection channel 120, and the fuel can move a greater distance in the air through hole 110, thereby fully mixing the fuel and the air in the air through hole 110, improving the combustion efficiency in the combustion chamber 400, more effectively meeting the requirements of fuel combustion on backfire suppression and combustion stability, reducing the local reaction temperature, and reducing the emission of NOx and other pollutants.

[0053] In addition, since the fuel and air have been premixed on the flame tube 1, the vortex finder can be omitted, and the weight and cost of the combustion chamber 4 can be reduced. Furthermore, the provision of the injection channel 120 can omit the nozzle, and further reduce the weight and cost of the combustion chamber 4.

[0054] In some embodiments, as shown in FIG. 1, the end wall 100 is provided with a plurality of injection channels 120, and the air through holes 110 are also provided in plurality, and the plurality of injection channels 120 and the plurality of air through holes 110 are connected in one-to-one correspondence, and each injection channel 120 is connected between one air through hole 110 and the collecting channel 140. Figure 3 ​As shown, the cooling flow channels 320 are multiple, and the multiple cooling flow channels 320 are arranged along the axial direction of the flame tube 1. In this way, the number of cooling flow channels 320 is increased along the circumferential direction of the flame tube 1, and the heat exchange area of the cooling flow channels 320 as a whole is larger, so that more fuel can be exchanged with the combustion chamber 400 in unit time, the heat exchange efficiency is higher, and the cooling effect on the combustion chamber 400 is better.

[0055] In some embodiments, as Figure 4 As shown, the air passage 300 further comprises a distribution flow channel 130 arranged in the end wall 100. The distribution flow channel 130 comprises a circumferential section 131 extending along the circumferential direction of the flame tube 1, and a plurality of radial sections 132. The air inlet 310 is connected to the circumferential section 131 along the circumferential direction of the flame tube 1, and the circumferential section 131 is located at the center of the circumferential section 131. The radial section 132 is connected to the circumferential section 131 and extends along the radial direction of the flame tube 1. Each radial section 132 is connected to at least one of the plurality of cooling flow channels 320. Any two radial sections 132 are connected to different two cooling flow channels 320.

[0056] By dividing the distribution flow channel 130 into the circumferential section 131 and the plurality of radial sections 132, the fuel in the air inlet 310 can flow to the plurality of radial sections 132 through the circumferential section 131, and then be delivered to the plurality of cooling flow channels 320 through the radial section 132, thereby improving the convenience of fuel delivery.

[0057] For example, each distribution flow channel 130 comprises two radial sections 132, each radial section 132 is connected to one of the cooling flow channels 320, and the distribution flow channel 130 has a flow converging channel 140 on each side along the circumferential direction of the flame tube 1. The distribution flow channel 130 and the radial section 132 close to it are connected to the same cooling flow channel 320.

[0058] The distribution flow channel 130 comprises an inner ring distribution flow channel and an outer ring distribution flow channel. The inner ring distribution flow channel is connected to the cooling flow channel 320 of the inner ring wall 210, and the radial section 132 of the inner ring distribution flow channel extends outward from the circumferential section 131 along the radial direction of the flame tube 1. The outer ring distribution flow channel is connected to the cooling flow channel 320 of the outer ring wall 220, and the radial section 132 of the outer ring distribution flow channel extends inward from the circumferential section 131 along the radial direction of the flame tube 1.

[0059] Any two adjacent flow converging channels 140 have an inner ring distribution flow channel and an outer ring distribution flow channel. Each flow converging channel 140 and the radial section 132 of the inner ring distribution flow channel close to it are connected to the same cooling flow channel 320 of the inner ring wall 210. Each flow converging channel 140 and the radial section 132 of the outer ring distribution flow channel close to it are connected to the same cooling flow channel 320 of the outer ring wall 220.

[0060] In some implementations, such as Figure 3 and Figure 4 As shown, the end wall 100 is provided with an air passage 110, and the cooling channel 320 includes a first cooling section 321, a second cooling section 322, and a third cooling section 323. The first cooling section 321 communicates with the air inlet 310 and extends along the axial direction of the flame tube 1, the second cooling section 322 communicates with the air passage 110 and extends along the axial direction of the flame tube 1, and the two ends of the third cooling section 323 are respectively connected to the first cooling section 321 and the second cooling section 322.

[0061] In other words, fuel flows from the air inlet 310 into the first cooling section 321, passes through the third cooling section 323 to the second cooling section 322, and is finally injected into the air passage 110. The third cooling section 323 can be connected to the confluence channel 140.

[0062] By dividing the cooling channel 320 into three sections, not only can the connection between the air inlet 310 and the air passage 110 be realized, but the extension dimension of the cooling channel 320 on the annular wall 200 is also extended. The fuel flows on the annular wall 200 for a longer time, which is beneficial to improving the heat exchange efficiency between the fuel and the combustion chamber 400 and more effectively reducing the temperature of the combustion chamber 400.

[0063] For example, the first cooling section 321 and the second cooling section 322 can be arranged in parallel. In this way, the first cooling section 321 and the second cooling section 322 together occupy a small space, which can improve the space utilization of the ring wall 200.

[0064] Furthermore, the third cooling section 323 can be arc-shaped, and there can be a smooth transition between the third cooling section 323 and the first cooling section 321, as well as between the third cooling section 323 and the second cooling section 322. This can reduce the flow resistance in the fuel recooling channel 320, increase the fuel flow rate, and prevent excessive local stress on the inner wall of the cooling channel 320, thereby reducing the probability of damage to the flame tube 1.

[0065] In some implementations, such as Figure 3 As shown, there are at least two cooling channels 320, which are spaced apart along the circumference of the flame tube 1. This increases the number of cooling channels 320 along the circumference of the flame tube 1, resulting in a larger heat exchange area between the cooling channels 320 and the combustion chamber 400. This allows for more fuel to exchange heat with the combustion chamber 400 per unit time, resulting in higher heat exchange efficiency and better cooling of the combustion chamber 400.

[0066] In addition, the two first cooling sections 321 are arranged oppositely, that is, the two first cooling sections 321 of the two cooling flow channels 320 are located between the two second cooling sections 322 of the two cooling flow channels 320. Among them, the air inlet 310 is located between the two first cooling sections 321 in the circumferential direction of the flame tube 1, and the air inlet 310 communicates with the two first cooling sections 321.

[0067] In this way, one air inlet 310 can provide combustion for two adjacent cooling flow channels 320, reducing the number of air inlets 310, and the distance between the air inlet 310 and the first cooling section 321 is short, so the size of the pipeline between the air inlet 310 and the first cooling section 321 is small, reducing the processing difficulty and processing cost, and ensuring the structural strength of the flame tube 1.

[0068] In some embodiments, as shown in Figure 3 The annular wall 200 is provided with a mixing hole 230, and at least one mixing hole 230 is arranged between the first cooling section 321 and the second cooling section 322 of the cooling flow channel 320. The mixing hole 230 is used to adjust the outlet temperature of the combustion chamber 4.

[0069] By arranging the mixing hole 230 between the first cooling section 321 and the second cooling section 322, on the one hand, it can prevent the distance between the first cooling section 321 and the second cooling section 322 from being too small, thereby avoiding the length of the third cooling section 323 being too small and being inconvenient to process, and the cooling range of the cooling flow channel 320 in the circumferential direction of the flame tube 1 is larger, fully utilizing the space of the annular wall 200 in the circumferential direction of the flame tube 1, and the heat exchange area with the combustion chamber 400 is larger, which can effectively absorb the temperature in the combustion chamber 400, and cool the combustion chamber 400, on the other hand, it can effectively utilize the space between the first cooling section 321 and the second cooling section 322, increase the arrangement number of the mixing hole 230, and be beneficial to accurately adjust the outlet temperature of the combustion chamber 4, and improve the space utilization of the annular wall 200.

[0070] In some embodiments, as shown in Figure 3 The annular wall 200 is provided with a mixing hole 230, and at least one mixing hole 230 is arranged between the two first cooling sections 321, and the mixing hole 230 is used to adjust the outlet temperature of the combustion chamber 4.

[0071] By arranging the mixing holes 230 between the adjacent first cooling sections 321, on the one hand, the distance between the adjacent first cooling sections 321 can be prevented from being too small, the cooling range of the adjacent two cooling flow channels 320 in the circumferential direction of the flame tube 1 is larger, the space of the ring wall 200 in the circumferential direction of the flame tube 1 is fully utilized, the heat exchange area with the combustion chamber 400 is larger, the temperature in the combustion chamber 400 can be effectively absorbed, the combustion chamber 400 is cooled, on the other hand, the space between the adjacent first cooling sections 321 can be effectively utilized, the arrangement number of the mixing holes 230 is increased, which is beneficial to accurately adjust the outlet temperature of the combustion chamber 4, and the space utilization of the ring wall 200 is improved.

[0072] In some embodiments, as shown in Figure 3 The ring wall 200 is provided with the mixing holes 230, the mixing holes 230 are closer to the end wall 100 relative to the third cooling section 323, the mixing holes 230 are used to adjust the outlet temperature of the combustion chamber 4, and the position of the mixing holes 230 is usually close to the outlet of the combustion chamber 4.

[0073] By arranging the mixing holes 230 closer to the end wall 100 relative to the third cooling section 323, that is, the third cooling section 323 is closer to the outlet of the combustion chamber 4 relative to the mixing holes 230, therefore, the size of the cooling flow channel 320 in the axial direction of the flame tube 1 is larger, the space of the ring wall 200 in the axial direction of the flame tube 1 can be fully utilized, and the heat exchange area with the combustion chamber 400 is larger, the combustion chamber 400 can be more effectively cooled.

[0074] In some embodiments, as shown in Figure 3 The ring wall 200 is provided with the mixing holes 230, the ring wall 200 is provided with the main combustion holes 240, at least one main combustion hole 240 is arranged between the adjacent first cooling sections 321, wherein the main combustion holes 240 are used to organize the combustion of the fuel in the combustion chamber 400, and the main combustion holes 240 are closer to the end wall 100 relative to the mixing holes 230.

[0075] By arranging the main combustion holes 240 between the adjacent first cooling sections 321, on the one hand, the distance between the adjacent first cooling sections 321 can be prevented from being too small, the cooling range of the adjacent two cooling flow channels 320 in the circumferential direction of the flame tube 1 is larger, the space of the ring wall 200 in the circumferential direction of the flame tube 1 is fully utilized, the heat exchange area with the combustion chamber 400 is larger, the temperature in the combustion chamber 400 can be effectively absorbed, the combustion chamber 400 is cooled, on the other hand, the space between the adjacent first cooling sections 321 can be effectively utilized, the arrangement number of the main combustion holes 240 is increased, which is beneficial to accurately adjust the combustion temperature of the combustion chamber 4, and the space utilization of the ring wall 200 is improved.

[0076] According to an embodiment of the present application, in another aspect, there is also provided a combustion chamber 4, which comprises the casing 2, the fuel pipe 3 and the flame tube 1. The fuel pipe 3 is arranged in the casing 2. The flame tube 1 is arranged in the casing 2.

[0077] That is, the fuel flows through the fuel pipe 3 to the air inlet 310, and then flows from the air inlet 310 to the cooling flow channel 320, and the fuel exchanges heat with the combustion chamber 400 in the cooling flow channel 320, which can reduce the temperature of the combustion chamber 400, without the need to additionally provide a cooling structure for the combustion chamber 400, thereby reducing the cooling cost and reducing the generation of thermal NOx.

[0078] The fuel pipe 3 comprises a main pipe 31, an inner ring pipe 32 and an outer ring pipe 33, the inner ring pipe 32 and the outer ring pipe 33 are communicated with the main pipe 31, the inner ring pipe 32 is communicated with the inner ring split flow channel, and the outer ring pipe 33 is communicated with the outer ring split flow channel, that is, the fuel of the inner ring pipe 32 flows to the cooling flow channel 320 of the inner ring wall 210, and the fuel of the outer ring pipe 33 flows to the cooling flow channel 320 of the outer ring wall 220.

[0079] The working process of the combustion chamber 4 is described in conjunction with the accompanying drawings:

[0080] Firstly, the fuel is split from the main pipe 31 of the fuel pipe 3 to the inner ring pipe 32 and the outer ring pipe 33;

[0081] Then, the fuel of the inner ring pipe 32 flows to the cooling flow channel 320 of the inner ring wall 210 through the inner ring split flow channel, and the fuel of the outer ring pipe 33 flows to the cooling flow channel 320 of the outer ring wall 220 through the outer ring split flow channel;

[0082] Next, the fuel in the cooling flow channel 320 flows through the first cooling section 321, the third cooling section 323 and the second cooling section 322 in sequence, and then flows to the converging flow channel 140;

[0083] Finally, the fuel of the converging flow channel 140 is injected to the air via hole 110 through the injection flow channel 120, mixed with the air in the air via hole 110, and then enters the combustion chamber 400 to be burned.

[0084] Although the embodiments of the present application are described in conjunction with the accompanying drawings, various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and changes fall within the scope defined by the appended claims.

Claims

1. A flame tube, characterized by The flame tube (1) is surrounded by a combustion chamber (400) and is provided with an air channel (300), the air channel (300) comprises an air inlet (310) and a cooling flow channel (320), the air inlet (310) and the cooling flow channel (320) are communicated, and the air inlet (310) is adapted to communicate with a fuel pipe (3); The flame tube (1) comprises: An end wall (100) located at one end of the combustion chamber (400), the air inlet (310) is arranged on the end wall (100), and the end wall (100) is provided with an air through hole (110); A ring wall (200) connected with the end wall (100) and surrounding the combustion chamber (400), the cooling flow channel (320) is arranged in the ring wall (200), and the ring wall (200) is provided with a mixing hole (230); The cooling flow channel (320) comprises a first cooling section (321), a second cooling section (322) and a third cooling section (323), the first cooling section (321) is communicated with the air inlet (310) and extends along the axial direction of the flame tube (1), the second cooling section (322) is communicated with the air through hole (110) and extends along the axial direction of the flame tube (1), and the two ends of the third cooling section are communicated with the first cooling section (321) and the second cooling section (322) respectively; The cooling flow channel (320) is at least two, two cooling flow channels (320) are arranged in the circumferential direction of the flame tube (1), and two first cooling sections (321) are arranged opposite to each other, the air inlet (310) is located between and communicated with two first cooling sections (321) in the circumferential direction of the flame tube (1); At least one mixing hole (230) is arranged between the first cooling section (321) and the second cooling section (322) of the cooling flow channel (320), and / or at least one mixing hole (230) is arranged between adjacent first cooling sections (321).

2. The flame tube of claim 1, wherein, The ring wall (200) is two, one of the two ring walls (200) is an inner ring wall (210) and the other is an outer ring wall (220), the outer ring wall (220) surrounds the inner ring wall (210), and the inner ring wall (210), the outer ring wall (220) and the end wall (100) surround the combustion chamber (400); The air channel (300) is two, one of the two air channels (300) is an inner ring air channel and the other is an outer ring air channel, the cooling flow channel (320) of the inner ring air channel is arranged in the inner ring wall (210), and the cooling flow channel (320) of the outer ring air channel is arranged in the outer ring wall (220).

3. The flame tube of claim 2, wherein, The end wall (100) is provided with a converging flow channel (140), and the converging flow channel (140) is communicated with the cooling flow channels (320) of the two air channels (300). The end wall (100) is provided with an air through hole (110) penetrating the end wall (100) along the axial direction of the flame tube (1), the air through hole (110) being in communication with the combustion cavity (400) and the converging flow passage (140).

4. The flame tube of claim 3, wherein, The end wall (100) is provided with a plurality of injection flow passages (120), the air through hole (110) being a plurality of air through holes, the plurality of injection flow passages (120) being in one-to-one correspondence with the plurality of air through holes (110) and in communication with the converging flow passage (140). The cross-sectional area of the injection flow passage (120) is smaller than the cross-sectional area of the converging flow passage (140).

5. The flame tube of claim 1, wherein, The air passage (300) further comprises a shunt flow passage (130) arranged in the end wall (100) and comprising: a circumferential segment (131) extending along the circumferential direction of the flame tube (1), the air inlet (310) being in communication with the circumferential segment (131) in the circumferential direction of the flame tube (1); a plurality of radial segments (132) in communication with the circumferential segment (131) and extending along the radial direction of the flame tube (1), each radial segment (132) being in communication with at least one cooling flow passage (320).

6. The flame tube of claim 1, wherein, The mixing hole (230) is closer to the end wall (100) relative to the third cooling segment (323); and / or, The annular wall (200) is provided with a main combustion hole (240), at least one main combustion hole (240) being arranged between adjacent first cooling segments (321).

7. A combustion chamber, characterized by Comprise: a casing (2); a fuel pipe (3) arranged in the casing (2); a flame tube (1) according to any one of claims 1-6 arranged in the casing (2).

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