Porous injection evaporating pipe

Abstract

The utility model relates to the technical field of gas turbines, in particular to a porous injection evaporation pipe which comprises an evaporation pipe body and a fuel oil capillary pipe. The evaporation pipe body comprises a mixing pipe section and an injection pipe section, the pipe diameter of the mixing pipe section is gradually increased from one end to the other end, and the injection pipe section is fixedly connected with the end, with the maximum pipe diameter, of the mixing pipe section; a first air inlet is formed in the end, away from the injection pipe section, of the mixing pipe section, and the fuel oil capillary pipe is inserted from the injection pipe section and extends to the first air inlet. A plurality of first fuel nozzles are formed in the pipe wall of the injection pipe section. Thus, the gradually-increased pipe diameter of the evaporation pipe body can achieve the expansion effect within a certain length, then the mixing effect is improved, fuel flows to the downstream from the upstream, close to the first air inlet, of the evaporation pipe body, is sprayed out to the upstream of the flame tube from the downstream first fuel spraying opening and then flows to the downstream from the upstream of the flame tube to be sprayed out. The fuel mixing retention time can be prolonged within the effective length, and the mixing effect is enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of gas turbines, in particular to a multi-hole injection evaporation tube. Background Art

[0002] When a gas turbine burns liquid fuel, obtaining a better atomization effect and strengthening the mixing of liquid and air are the keys to improving combustion efficiency. For small or micro combustion chambers, due to size limitations, swirlers cannot be used. For conventional combustion chambers, the fuel stays in the combustion chamber for a short time and has a low degree of mixing with air, which can easily cause problems such as incomplete combustion. The evaporator tube has the characteristics of simple structure, low cost, and easy ignition. Therefore, the evaporator tube structure is often used in micro or small gas turbines.

[0003] The evaporator tube can not only realize the atomization and evaporation of fuel, but also realize the premixing of air and fuel in the tube. In the evaporator tube, the high-speed incoming air is used to break up the liquid fuel, and the high temperature outside the tube is also conducive to the evaporation of the liquid fuel, forming a fuel-air mixture that is sprayed from the evaporator tube outlet to the head of the combustion chamber. At the same time, the evaporator tube can also increase the residence time of the mixed air, so as to better realize the evaporation and premixing of fuel.

[0004] At present, the evaporator tube structure is mostly T-shaped, crutch-shaped and other structures. It is difficult to obtain a good oil-gas mixture in a short time. At the same time, the vortex is small when the straight tube evaporator tube flows inside, and the air and fuel are not mixed evenly, which can easily lead to incomplete combustion. Utility Model Content

[0005] The utility model aims to solve at least one problem in the above-mentioned background technology and provide a multi-hole spray evaporation tube.

[0006] In order to achieve the above-mentioned purpose, the utility model provides a multi-hole spray evaporation tube, comprising:

[0007] Evaporator tube body and fuel capillary tube;

[0008] The evaporation tube body comprises a mixing tube section and an injection tube section, the diameter of the mixing tube section gradually increases from one end to the other end, and the injection tube section is fixedly connected to the largest diameter end of the mixing tube section;

[0009] A first air inlet is provided at one end of the mixing pipe section away from the injection pipe section, the fuel capillary is inserted from the injection pipe section and extends to the first air inlet, and the fuel capillary is used to transport fuel into the evaporation pipe body;

[0010] A plurality of first fuel nozzles are arranged on the tube wall of the injection tube section, and the first fuel nozzles are used to spray out the mixed fuel in the tube body of the evaporation tube.

[0011] Preferably, the mixing pipe section comprises a first pipe section, a second pipe section and a third pipe section, the diameter of the second pipe section is larger than that of the first pipe section, the diameter of the third pipe section is larger than that of the second pipe section, and the injection pipe section, the third pipe section, the second pipe section and the first pipe section are fixedly connected in sequence;

[0012] The first air inlet is arranged on the first pipe section, and the fuel capillary is inserted through the third pipe section and extends into the first pipe section.

[0013] Preferably, the injection pipe section is configured to be conical, and the tip of the injection pipe section is away from the mixing pipe section;

[0014] The first fuel nozzles are evenly arranged along the circumference of the tube wall of the injection tube section, and the fuel capillary tube is inserted into the evaporation tube body along the central axis of the injection tube section.

[0015] Preferably, the pipe wall of the mixing pipe section is configured to be sawtooth-shaped.

[0016] Preferably, a plurality of groups of spoiler columns are arranged in the mixing pipe section, and the spoiler columns are radially arranged on the pipe wall of the mixing pipe section;

[0017] At least two spoiler columns are arranged in each group, and the plurality of spoiler columns in each group are arranged at intervals along the circumferential direction of the tube wall of the mixing tube section, and the spoiler columns in the plurality of groups are arranged at intervals from each other.

[0018] Preferably, the fuel capillary tube comprises a spiral tube section and a straight tube section, the spiral tube section is fixedly connected to the straight tube section, the spiral tube section is arranged in a spiral shape, the straight tube section is arranged in a straight shape, and the straight tube section is inserted into the tube body of the evaporator tube;

[0019] A plurality of second fuel nozzles are arranged at one end of the straight tube section away from the spiral tube section, and the second fuel nozzles are used to transport fuel into the tube body of the evaporator tube.

[0020] Preferably, a plurality of the second fuel nozzles are arranged on the axial surface of the straight tube segment and on the circumferential tube wall of the straight tube segment;

[0021] The second fuel nozzles on the tube wall of the straight tube section are evenly arranged along the circumference of the tube wall.

[0022] Preferably, the spoiler column is arranged at the connection between the first pipe segment and the second pipe segment, and at the connection between the second pipe segment and the third pipe segment.

[0023] Preferably, the spoiler columns in the two groups are staggered with each other in the axial direction of the evaporator tube body.

[0024] Preferably, the multi-hole jet evaporation tube is arranged in a casing, one end of the casing has a second air inlet, and the first air inlet is connected to the second air inlet;

[0025] A fuel inlet is arranged at one end of the spiral tube section away from the evaporation tube body, the fuel inlet penetrates the casing and communicates with the outside, and the fuel inlet is arranged close to the second air inlet.

[0026] Based on this, the beneficial effects of the utility model are:

[0027] 1. According to the scheme of the utility model, the fuel capillary is inserted into the evaporator tube body from the end away from the first air inlet and extends to the first air inlet. With such a configuration, the evaporator tube can be inserted from the downstream of the flame tube, so that after the fuel is sprayed to the upstream of the evaporator tube body through the fuel capillary, it flows through the upstream of the evaporator tube body to the downstream space for primary mixing, and after being sprayed to the upstream of the flame tube through the evaporator tube body, it flows through the upstream of the flame tube to the downstream space for secondary mixing, so as to obtain a longer mixing section in a shorter distance, thereby improving the mixing uniformity problem, increasing the mixed gas residence time, and improving the combustion efficiency;

[0028] 2. According to the scheme of the utility model, the evaporation tube body includes a mixing tube section and an injection tube section. The diameter of the mixing tube section gradually increases. The injection tube section is fixedly connected to the maximum diameter end of the mixing tube section. At the same time, the injection tube section is set to be conical, and the tip is set away from the mixing tube section. In this way, the mixing tube section can provide a larger mixing space, and the conical structure of the injection tube section can provide a higher mixing flow rate. When secondary mixing is performed with the main combustion hole in the flame tube, a better mixing effect can be achieved;

[0029] 3. Through the solution of the utility model, the pipe wall of the mixing pipe section is set to a zigzag shape, which can increase the heat exchange area and enhance the heat exchange of the fuel. At the same time, it can also extend the residence time of the mixture and enhance the mixing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic diagram schematically shows the structure of an evaporation tube according to an embodiment of the utility model;

[0031] Figure 2 A cross-sectional view schematically showing an evaporation tube according to an embodiment of the utility model;

[0032] Figure 3 A diagram schematically showing the use state of an evaporation tube according to an embodiment of the utility model;

[0033] Explanation of the reference numerals: evaporator tube body 10, mixing tube section 101, first air inlet 1011, first tube section 1012, second tube section 1013, third tube section 1014, injection tube section 102, first fuel nozzle 1021, spoiler column 103, fuel capillary 20, fuel inlet 201, spiral tube section 202, straight tube section 203, second fuel nozzle 2031, flame tube 30, casing 40, second air inlet 401, third fuel nozzle 402. DETAILED DESCRIPTION

[0034] The content of the present application will now be discussed with reference to exemplary embodiments. It should be understood that the embodiments discussed are only to enable those skilled in the art to better understand and thus implement the content of the present application, rather than implying any limitation on the scope of the present application.

[0035] As used herein, the term “including” and variations thereof are to be interpreted as open-ended terms meaning “including, but not limited to.” The term “based on” is to be interpreted as “based, at least in part, on.” The terms “one embodiment” and “an embodiment” are to be interpreted as “at least one embodiment.”

[0036] Figure 1 A schematic diagram schematically shows the structure of an evaporation tube according to an embodiment of the utility model. Figure 2 A cross-sectional view schematically shows an evaporation tube according to an embodiment of the present invention. Figure 3 A diagram schematically shows the use state of the evaporation tube of one embodiment of the utility model, as shown in FIG. Figure 1-3 As shown, a multi-hole spray evaporation tube of the utility model comprises:

[0037] Evaporation tube body 10 and fuel capillary tube 20;

[0038] The evaporation tube body 10 includes a mixing tube section 101 and an injection tube section 102. The diameter of the mixing tube section 101 gradually increases from one end to the other end. The injection tube section 102 is fixedly connected to the largest diameter end of the mixing tube section 101.

[0039] A first air inlet 1011 is provided at one end of the mixing pipe section 101 away from the injection pipe section 102. The fuel capillary 20 is inserted from the injection pipe section 102 and extends to the first air inlet 1011. The fuel capillary 20 is used to transport fuel into the evaporator tube body 10.

[0040] A first fuel nozzle 1021 is provided on the tube wall of the injection tube section 102 , and the first fuel nozzle 1021 is used to spray out the mixed fuel in the evaporator tube body 10 .

[0041] Specifically, the evaporator tube body 10 is set to be a straight cylinder, which includes a mixing tube section 101 and an injection tube section 102. The diameter of the mixing tube section 101 gradually increases from one end to the other end, which can achieve an expansion effect within a certain range and improve the mixing effect within an effective length. At the same time, it can also increase the heat exchange area and achieve a more sufficient heat exchange effect for the fuel.

[0042] like Figure 3 As shown, the multi-hole jet evaporation tube is arranged in the flame tube 30, and a casing 40 is arranged outside the flame tube 30. A second air inlet 401 is arranged at one end of the casing 40, and a third fuel nozzle 402 is arranged at the other end. The first air inlet 1011 of the evaporation tube body 10 is arranged close to the third fuel nozzle 402. The fuel capillary tube 20 runs through the casing 40. The end of the fuel capillary tube 20 away from the evaporation tube body 10 has a fuel inlet 201, and the fuel inlet 201 is arranged close to the second air inlet 401.

[0043] In this arrangement, the multi-porous jet evaporator tube is "inserted upside down at the tail end" of the flame tube 30, and the end thereof that sprays fuel is located in the upstream area of ​​the flame tube 30, so that the fuel and air are mixed inside the evaporator tube body 10 and sprayed out from the upstream of the flame tube 30, and secondary mixing is also performed in the process from upstream to downstream in the flame tube 30. By increasing the fuel premixing section, the problem of mixing uniformity is improved, the residence time of the mixed gas is increased, the mixing effect is improved, and the combustion efficiency is improved.

[0044] Further, the mixing pipe section 101 includes a first pipe section 1012, a second pipe section 1013 and a third pipe section 1014, the diameter of the second pipe section 1013 is larger than the first pipe section 1012, the diameter of the third pipe section 1014 is larger than the first pipe section 1012, the diameter of the third pipe section 1014 is larger than the second pipe section 1013, and the injection pipe section 102, the third pipe section 1014, the second pipe section 1013 and the first pipe section 1012 are fixedly connected in sequence;

[0045] The first air inlet 1011 is disposed on the first pipe section 1012 , and the fuel capillary tube 20 is inserted through the third pipe section 1014 and extends into the first pipe section 1012 .

[0046] Specifically, the first pipe section 1012, the second pipe section 1013 and the third pipe section 1014 are configured as straight tubes, and a larger mixing space can be provided through the multi-section evaporator tube structure. At the same time, the straight tube-shaped first pipe section 1012, the second pipe section 1013 and the third pipe section 1014 can allow the mixed fuel to be mixed stably before expansion, thereby ensuring the uniformity of the mixing.

[0047] At the same time, the fuel capillary 20 is inserted through the third pipe section 1014 and extends into the first pipe section 1012, so that the fuel can be immediately mixed with the air of the first air inlet 1011 after being sprayed out from the fuel capillary 20, thereby improving mixing efficiency.

[0048] Furthermore, the injection pipe section 102 is configured to be conical, and the tip of the injection pipe section 102 is away from the mixing pipe section 101;

[0049] The first fuel nozzles 1021 are evenly arranged along the circumferential direction of the tube wall of the injection tube section 102 , and the fuel capillary tube 20 is inserted into the evaporation tube body 10 along the central axis of the injection tube section 102 .

[0050] Specifically, setting the injection pipe section 102 to a cone shape can compress and converge the mixed fuel when it is sprayed, thereby increasing the flow rate of the mixed fuel. When the mixed fuel is sprayed from the porous injection evaporator tube into the flame tube 30, a better secondary mixing effect with the air can be achieved.

[0051] Furthermore, a plurality of groups of spoiler columns 103 are arranged in the mixing pipe section 101, and the spoiler columns 103 are radially arranged on the pipe wall of the mixing pipe section 101;

[0052] At least two spoiler columns 103 are arranged in each group, and preferably four are arranged. The multiple spoiler columns 103 in each group are arranged at intervals along the circumferential direction of the pipe wall of the mixing pipe section 101, and the multiple groups of spoiler columns 103 are arranged at intervals from each other.

[0053] Specifically, the spoiler column 103 is set to be cylindrical and is perpendicular to the tube wall of the mixing tube section 101. The setting of the spoiler column 103 can enhance the airflow disturbance, generate more vortices in the limited mixing tube section 101, and further enhance the mixing effect of fuel and air.

[0054] Each group of spoiler columns 103 is arranged at the connection between the first pipe segment 1012 and the second pipe segment 1013, and at the connection between the second pipe segment 1013 and the third pipe segment 1014, and the spoiler columns 103 in the two groups are staggered in the axial direction of the evaporator tube body 10, and the staggered angle range is 30°-60°, preferably 45°. Such an arrangement can further enhance the airflow disturbance.

[0055] Furthermore, the fuel capillary tube 20 includes a spiral tube section 202 and a straight tube section 203, the spiral tube section 202 is fixedly connected to the straight tube section 203, the spiral tube section 202 is set to a spiral shape, the straight tube section 203 is set to a straight shape, and the straight tube section 203 is inserted into the evaporator tube body 10;

[0056] A plurality of second fuel nozzles 2031 are disposed at one end of the straight tube section 203 away from the spiral tube section 202 . The second fuel nozzles 2031 are used to transport fuel into the evaporator tube body 10 .

[0057] Specifically, the setting of the spiral pipe segment 202 can form a swirl after the fuel passes through the spiral pipe segment 202, which can enhance the heat exchange effect. At the same time, the spiral pipe segment 202 is located in the flame tube 30, absorbing heat in the high temperature area of ​​the flame tube 30, so that the initial temperature of the fuel increases, thereby improving the fuel atomization effect.

[0058] At the same time, the second fuel nozzle 2031 is located at the end of the straight tube segment 203, and multiple second fuel nozzles 2031 are arranged on the axial surface of the straight tube segment 203 and on the circumferential side wall of the straight tube segment 203. At the same time, the second fuel nozzles 2031 on the tube wall of the straight tube segment 203 are evenly arranged along the circumference of the tube wall. With this arrangement, the second fuel nozzles 2031 located in the axial direction can form a counter-attack with the air of the first air inlet 1011, and the second fuel nozzles 2031 located in the circumferential direction can cross-jet with the air, thereby enhancing the turbulence and further strengthening the mixing effect.

[0059] Furthermore, the tube wall of the mixing tube section 101 is configured to be serrated. With this configuration, the serrated evaporator tube body 10 structure can increase the heat exchange area, enhance heat exchange, extend the residence time of the mixture, and strengthen the mixing effect. At the same time, the serrated structure can also withstand a certain amount of thermal expansion at high temperatures, absorb more heat, and enhance the atomization and evaporation of the liquid fuel.

[0060] To summarize, the fuel capillary 20 is inserted into the evaporator tube body 10 from the end away from the first air inlet 1011 and extends to the first air inlet 1011. With this arrangement, the evaporator tube can be inserted from the downstream of the flame tube 30, so that the fuel is mixed once in the evaporator tube body 10 after being sprayed out through the fuel capillary 20, and is mixed twice in the flame tube 30 after being sprayed out through the evaporator tube body 10. A longer mixing section can be obtained in a shorter distance, thereby improving the problem of mixing uniformity, increasing the residence time of the mixed gas, and improving the combustion efficiency.

[0061] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with (but not limited to) technical features with similar functions disclosed in the present application.

[0062] It should be understood that the size of the serial numbers of the steps in the invention content and embodiments of the present application does not absolutely mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

Claims

1. A porous jet evaporation tube, characterized in that: include: Evaporator tube body and fuel capillary tube; The evaporation tube body comprises a mixing tube section and an injection tube section, the diameter of the mixing tube section gradually increases from one end to the other end, and the injection tube section is fixedly connected to the largest diameter end of the mixing tube section; A first air inlet is provided at one end of the mixing pipe section away from the injection pipe section, the fuel capillary is inserted from the injection pipe section and extends to the first air inlet, and the fuel capillary is used to transport fuel into the evaporation pipe body; A plurality of first fuel nozzles are arranged on the tube wall of the injection tube section, and the first fuel nozzles are used to spray out the mixed fuel in the tube body of the evaporation tube.

2. A porous jet evaporation tube according to claim 1, characterized in that: The mixing pipe section includes a first pipe section, a second pipe section and a third pipe section, the diameter of the second pipe section is larger than that of the first pipe section, the diameter of the third pipe section is larger than that of the second pipe section, and the injection pipe section, the third pipe section, the second pipe section and the first pipe section are fixedly connected in sequence; The first air inlet is arranged on the first pipe section, and the fuel capillary is inserted through the third pipe section and extends into the first pipe section.

3. The porous jet evaporation tube according to claim 1, characterized in that: The injection pipe section is configured to be conical, and the tip of the injection pipe section is away from the mixing pipe section; The first fuel nozzles are evenly arranged along the circumference of the tube wall of the injection tube section, and the fuel capillary tube is inserted into the evaporation tube body along the central axis of the injection tube section.

4. The porous jet evaporation tube according to claim 1, characterized in that: The pipe wall of the mixing pipe section is configured to be in a sawtooth shape.

5. The porous jet evaporation tube according to claim 2, characterized in that: A plurality of groups of flow-disturbing columns are arranged in the mixing pipe section, and the flow-disturbing columns are radially arranged on the pipe wall of the mixing pipe section; At least two spoiler columns are arranged in each group, and the plurality of spoiler columns in each group are arranged at intervals along the circumferential direction of the tube wall of the mixing tube section, and the spoiler columns in the plurality of groups are arranged at intervals from each other.

6. The porous jet evaporation tube according to claim 1, characterized in that: The fuel capillary tube comprises a spiral tube section and a straight tube section, the spiral tube section is fixedly connected to the straight tube section, the spiral tube section is arranged in a spiral shape, the straight tube section is arranged in a straight shape, and the straight tube section is inserted into the tube body of the evaporator tube; A plurality of second fuel nozzles are arranged at one end of the straight tube section away from the spiral tube section, and the second fuel nozzles are used to transport fuel into the tube body of the evaporator tube.

7. The multi-hole spray evaporation tube according to claim 6, characterized in that: A plurality of the second fuel nozzles are arranged on the axial surface of the straight tube segment and on the circumferential tube wall of the straight tube segment; The second fuel nozzles on the tube wall of the straight tube section are evenly arranged along the circumference of the tube wall.

8. The multi-hole spray evaporation tube according to claim 5, characterized in that: The spoiler column is arranged at the connection between the first pipe section and the second pipe section, and the connection between the second pipe section and the third pipe section.

9. The multi-hole spray evaporation tube according to claim 8, characterized in that: The spoiler columns in the two groups are staggered with each other in the axial direction of the evaporator tube body.

10. The porous jet evaporation tube according to claim 6, characterized in that: The multi-hole jet evaporation tube is arranged in the casing, one end of the casing has a second air inlet, and the first air inlet is connected to the second air inlet; A fuel inlet is arranged at one end of the spiral tube section away from the evaporation tube body, the fuel inlet penetrates the casing and communicates with the outside, and the fuel inlet is arranged close to the second air inlet.

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