Method for adjusting quality of outlet temperature field in improved design of combustion chamber of gas turbine

Abstract

The invention belongs to the technical field of gas turbine combustion chamber improved design, and particularly relates to a gas turbine combustion chamber improved design outlet temperature field quality adjusting method so as to improve the optimal main combustion zone oil-gas ratio FAR of a combustion chamber and the optimal main combustion zone and the working oil-gas ratio FAR work, calculate the main combustion zone air distribution ratio R main combustion zone of the combustion chamber, and improve the combustion chamber air distribution ratio R main combustion zone. And calculating to obtain a main combustion zone effective opening area S main combustion zone of the improved combustion chamber and a main combustion zone physical opening area A main combustion zone of the improved combustion chamber by combining the total effective opening area S total of the prototype combustion chamber and the flow coefficient mu main combustion zone of the opening of the main combustion zone, so as to adjust the main combustion zone physical opening area of the prototype combustion chamber. The method is convenient, fast and high in theoretical property, and can better improve the quality of the combustion chamber outlet temperature field.

Description

Technical Field

[0001] The present application belongs to the technical field of improved design of gas turbine combustion chambers, and specifically relates to a method for adjusting the quality of the outlet temperature field of an improved design of a gas turbine combustion chamber. Background Art

[0002] The quality of the combustion chamber outlet temperature field has a crucial impact on the life of the gas turbine blades. Data show that a 30°C rise in the gas temperature at a radial position of the turbine blade will reduce the life of the turbine blade by half. In the improved design of the gas turbine, it is necessary to reduce the combustion chamber temperature rise as much as possible to ensure the quality of the combustion chamber outlet temperature field, thereby ensuring the service life of the turbine blades.

[0003] The combustion chamber outlet temperature field is affected by many factors such as combustion chamber air flow distribution, nozzle atomization performance, swirler characteristics, etc. In the improvement and modification design of the combustion chamber, in order to reduce the development risk and shorten the development cycle, the method of adjusting the combustion chamber air flow distribution is usually adopted to reduce the combustion chamber temperature rise and improve the quality of the combustion chamber outlet temperature field.

[0004] Practice has shown that, under the premise that the total effective opening area of ​​the combustion chamber remains unchanged, increasing the effective opening area of ​​the main combustion zone of the combustion chamber and reducing the effective opening area on the rear section of the flame tube side wall can improve the quality of the combustion chamber outlet temperature field. In this regard, currently, in the improved and modified design of the combustion chamber, most of them are to increase the effective opening area of ​​the main combustion zone of the combustion chamber and reduce the effective opening area on the rear section of the flame tube side wall while ensuring that the total effective opening area of ​​the combustion chamber remains unchanged, so as to improve the quality of the combustion chamber outlet temperature field. This technical solution has the following defects in specific application:

[0005] 1) The adjustment amount of the effective opening area of ​​the main combustion zone of the combustion chamber is mostly based on experience, which is subjective and arbitrary, and there is a situation where the quality of the combustion chamber outlet temperature field cannot be well improved. Alternatively, it is determined by experiment or simulation, which is time-consuming and laborious.

[0006] 2) Taking into account the cheapness of the improved and modified design, the effective opening area of ​​the rear section of the flame tube side wall is mostly reduced by reducing the effective opening area of ​​the cooling holes on the flame tube side wall. The effective opening area of ​​the cooling holes on the flame tube side wall is sensitive to the flame tube wall temperature. Reducing the effective opening area of ​​the cooling holes on the flame tube side wall can easily lead to a significant increase in the flame tube wall temperature, seriously affecting the service life of the flame tube.

[0007] This application is proposed in view of the above-mentioned technical defects. Summary of the invention

[0008] The purpose of the present application is to provide a method for adjusting the quality of the outlet temperature field of an improved gas turbine combustion chamber design, so as to overcome or alleviate at least one of the known technical defects.

[0009] The technical solution of this application is:

[0010] A method for adjusting the quality of the outlet temperature field of a gas turbine combustion chamber improved design, comprising:

[0011] Step 1: Improve the optimal main combustion zone oil-gas ratio FAR of the combustion chamber 主燃区最佳 、Operating oil-gas ratio FAR 工作 , calculate the air distribution ratio R of the main combustion zone of the improved combustion chamber 主燃区 ;

[0012] Step 2: Improve the air distribution ratio R in the main combustion zone of the combustion chamber 主燃区 And the total effective opening area S of the prototype combustion chamber 总 , the effective opening area S of the main combustion zone of the improved combustion chamber is calculated 主燃区 ;

[0013] Step 3: Improve the effective opening area S of the main combustion zone of the combustion chamber 主燃区 and the flow coefficient μ of the opening in the main combustion zone 主燃区 , the physical opening area A of the main combustion zone of the improved combustion chamber is calculated 主燃区 ;

[0014] Step 4: Improve the physical opening area A of the main combustion zone of the combustion chamber 主燃区 , the physical opening area of ​​the main combustion zone of the prototype combustion chamber was adjusted;

[0015] Step 5: Improve the effective opening area S of the main combustion zone of the combustion chamber 主燃区 The difference between the effective opening area of ​​the main combustion zone of the prototype combustion chamber and △S 主燃区 , as the adjustment amount of the effective opening area on the rear section of the flame tube side wall of the improved combustion chamber △S 火焰筒壁后段 ;

[0016] Step 6: Adjust the effective opening area on the rear section of the flame tube side wall of the combustion chamber by △S 火焰筒壁后段 and the flow coefficient μ of the opening on the rear section of the flame tube side wall 火焰筒壁后段 , the adjustment amount of the physical opening area on the rear section of the flame tube side wall of the improved combustion chamber is calculated as △A 火焰筒壁后段 ;

[0017] Step 7: Adjust the amount of physical opening area △A on the rear section of the flame tube side wall of the improved combustion chamber 火焰筒壁后段 , the physical opening area on the rear section of the flame tube side wall of the prototype combustion chamber is adjusted.

[0018] According to at least one embodiment of the present application, in the above-mentioned method for adjusting the quality of the outlet temperature field of the improved design of the gas turbine combustion chamber, step 1 is specifically as follows:

[0019] R 主燃区 =FAR 工作 / FAR 主燃区最佳 .

[0020] According to at least one embodiment of the present application, in the above-mentioned method for adjusting the quality of the outlet temperature field of the improved design of the gas turbine combustion chamber, step 2 is specifically as follows:

[0021] S 主燃区 =R 主燃区 *S 总 .

[0022] According to at least one embodiment of the present application, in the above-mentioned method for adjusting the quality of the outlet temperature field of the improved design of the gas turbine combustion chamber, step three is specifically as follows:

[0023] A 主燃区 =S 主燃区 / μ 主燃区 .

[0024] According to at least one embodiment of the present application, in the above-mentioned method for adjusting the outlet temperature field quality of the improved design of the gas turbine combustion chamber, in step four, when adjusting the physical opening area of ​​the main combustion zone of the prototype combustion chamber, the physical opening area of ​​the head cooling hole is adjusted first. When the adjustment of the physical opening area of ​​the head cooling hole cannot meet the requirements, the physical opening areas of the main combustion hole and the swirler are adjusted in turn.

[0025] According to at least one embodiment of the present application, in the above-mentioned method for adjusting the quality of the outlet temperature field of the improved design of the gas turbine combustion chamber, step six is ​​specifically as follows:

[0026] △A 火焰筒壁后段 =△S 火焰筒壁后段 / μ 火焰筒壁后段 .

[0027] According to at least one embodiment of the present application, in the above-mentioned method for adjusting the outlet temperature field quality of the improved design of the gas turbine combustion chamber, when adjusting the physical opening area on the rear section of the flame tube side wall of the prototype combustion chamber, the physical opening area of ​​the flame tube mixing air inlet hole is adjusted first. When the adjustment of the physical opening area of ​​the flame tube mixing air inlet hole cannot meet the requirements, the physical opening area of ​​the flame tube cooling air inlet hole is adjusted. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of air distribution in a gas turbine combustion chamber provided in an embodiment of the present application.

[0029] In order to better illustrate the present embodiment, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. In addition, the drawings are only used for illustrative purposes and should not be construed as limitations on the present application. DETAILED DESCRIPTION

[0030] In order to make the technical solution and advantages of the present application clearer, the technical solution of the present application will be described in further detail in detail and in detail with reference to the accompanying drawings. It can be understood that the specific embodiments described here are only partial embodiments of the present application, which are only used to explain the present application, not to limit the present application. It should be noted that, for the convenience of description, only the parts related to the present application are shown in the accompanying drawings, and other related parts can refer to the general design.

[0031] In addition, unless otherwise defined, the technical terms or scientific terms used in the description of this application shall have the usual meanings understood by those of ordinary skill in the art to which this application belongs. The words used in the description of this application to indicate orientation are only used to indicate relative directions or positional relationships. When the absolute position of the described object changes, its relative positional relationship may also change accordingly. The word "include" used in the description of this application indicates that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, but does not exclude other elements or objects.

[0032] In addition, it should be noted that, unless otherwise clearly specified and limited, the words "installation", "connection" and similar terms used in the description of this application should be understood in a broad sense. For example, the connection can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. Technical personnel in the field can understand its specific meaning in this application according to the specific circumstances.

[0033] Gas turbine combustor air distribution Figure 1 As shown, the inlet air of the combustion chamber enters the flame tube through the swirler, the head cooling hole, the main combustion hole, the flame tube cooling air inlet hole and the flame tube mixing air inlet hole, wherein the effective opening area of ​​the main combustion zone of the combustion chamber is composed of the effective opening areas of the swirler, the head cooling hole and the main combustion hole. By adjusting the effective opening area of ​​the head cooling hole, the effective opening area of ​​the main combustion zone of the combustion chamber is increased, which is more sensitive to reducing the temperature rise of the combustion chamber and has little effect on the main combustion zone of the combustion chamber, can well ensure the quality of the combustion chamber outlet temperature field, and has little change to the combustion chamber structure, which is easy to implement; the effective opening area on the rear section of the flame tube side wall is composed of the effective opening areas of the flame tube cooling air inlet hole and the flame tube mixing air inlet hole. By adjusting the effective opening area of ​​the flame tube mixing air inlet hole, the effective opening area on the rear section of the flame tube side wall is reduced, which has little effect on the flame tube wall temperature and will not cause a significant increase in the flame tube wall temperature, seriously affecting the service life of the flame tube.

[0034] Based on the above, an embodiment of the present application provides a method for adjusting the quality of the outlet temperature field of an improved gas turbine combustion chamber.

[0035] Step 1: Improve the optimal main combustion zone oil-gas ratio FAR of the combustion chamber 主燃区最佳 、Operating oil-gas ratio FAR 工作 , calculate the air distribution ratio R of the main combustion zone of the improved combustion chamber 主燃区 .

[0036] Improve the best main combustion zone oil-gas ratio FAR of the combustion chamber 主燃区最佳 The working oil-gas ratio FAR of the combustion chamber can be determined by theoretical calculation or analogy with similar combustion chambers to improve the combustion chamber 工作 Can be determined according to the development specifications.

[0037] R 主燃区 =FAR 工作 / FAR 主燃区最佳 ……(1)

[0038] Step 2: Improve the air distribution ratio R in the main combustion zone of the combustion chamber 主燃区 And the total effective opening area S of the prototype combustion chamber 总 , the effective opening area S of the main combustion zone of the improved combustion chamber is calculated 主燃区 .

[0039] S 主燃区 =R 主燃区 *S 总 ……(2)

[0040] Step 3: Improve the effective opening area S of the main combustion zone of the combustion chamber 主燃区 and the flow coefficient μ of the opening in the main combustion zone 主燃区 , the physical opening area A of the main combustion zone of the improved combustion chamber is calculated 主燃区 .

[0041] Flow coefficient μ of the main combustion zone opening 主燃区 It can be determined according to the design manual or test.

[0042] A 主燃区 =S 主燃区 / μ 主燃区 ……(3)

[0043] Step 4: Improve the physical opening area A of the main combustion zone of the combustion chamber 主燃区 , the physical opening area of ​​the main combustion zone of the prototype combustion chamber is adjusted.

[0044] The physical opening area of ​​the main combustion zone of the prototype combustion chamber is adjusted to match the physical opening area A of the main combustion zone of the improved combustion chamber. 主燃区 , thereby increasing the effective opening area of ​​the main combustion zone of the improved combustion chamber, which is consistent with the effective opening area S of the main combustion zone of the improved combustion chamber 主燃区 .

[0045] When adjusting the physical opening area of ​​the main combustion zone of the prototype combustion chamber, the physical opening area of ​​the head cooling hole is adjusted first. When the adjustment of the physical opening area of ​​the head cooling hole cannot meet the requirements, the physical opening areas of the main combustion hole and the swirler are adjusted in turn.

[0046] Step 5: Improve the effective opening area S of the main combustion zone of the combustion chamber 主燃区 The difference between the effective opening area of ​​the main combustion zone of the prototype combustion chamber and △S 主燃区 , as the adjustment amount of the effective opening area on the rear section of the flame tube side wall of the improved combustion chamber △S 火焰筒壁后段 .

[0047] Step 6: Adjust the effective opening area on the rear section of the flame tube side wall of the combustion chamber by △S 火焰筒壁后段 and the flow coefficient μ of the opening on the rear section of the flame tube side wall 火焰筒壁后段 , the adjustment amount of the physical opening area on the rear section of the flame tube side wall of the improved combustion chamber is calculated as △A 火焰筒壁后段 .

[0048] Flow coefficient μ of the opening on the rear section of the flame tube side wall 火焰筒壁后段 It can be determined according to the design manual or tests.

[0049] △A 火焰筒壁后段 =△S 火焰筒壁后段 / μ 火焰筒壁后段 ……(4)

[0050] Step 7: Adjust the amount of physical opening area △A on the rear section of the flame tube side wall of the improved combustion chamber 火焰筒壁后段 , the physical opening area on the rear section of the flame tube side wall of the prototype combustion chamber is adjusted.

[0051] The physical opening area on the rear section of the flame tube side wall of the prototype combustion chamber is adjusted to ensure that the total effective opening area of ​​the improved combustion chamber is the same as the total effective opening area S of the prototype combustion chamber. 总 Match.

[0052] When adjusting the physical opening area on the rear section of the flame tube side wall of the prototype combustion chamber, the physical opening area of ​​the flame tube mixing air inlet hole is adjusted first. When the physical opening area of ​​the flame tube mixing air inlet hole cannot meet the requirements, the physical opening area of ​​the flame tube cooling air inlet hole is adjusted.

[0053] The above embodiment discloses a method for adjusting the quality of the outlet temperature field of the improved design of the gas turbine combustion chamber to improve the optimal main combustion zone oil-gas ratio FAR of the combustion chamber. 主燃区最佳 、Operating oil-gas ratio FAR 工作 , calculate the air distribution ratio R of the main combustion zone of the improved combustion chamber 主燃区 , and then combined with the total effective opening area S of the prototype combustion chamber总 , the flow coefficient μ of the main combustion zone opening 主燃区 , the effective opening area S of the main combustion zone of the improved combustion chamber is calculated 主燃区 And improve the physical opening area A of the main combustion zone of the combustion chamber 主燃区 , so as to adjust the physical opening area of ​​the main combustion zone of the prototype combustion chamber, which is convenient, fast, theoretically strong, and can ensure better improvement of the quality of the combustion chamber outlet temperature field.

[0054] The method for adjusting the quality of the outlet temperature field of the improved design of the gas turbine combustion chamber disclosed in the above embodiment is to adjust the physical opening area of ​​the flame tube side wall rear section of the prototype combustion chamber, and give priority to adjusting the physical opening area of ​​the flame tube mixing inlet hole, so as to ensure that the total effective opening area of ​​the improved combustion chamber is equal to the total effective opening area S of the prototype combustion chamber. 总 It has little effect on the wall temperature of the flame tube and will not cause a significant increase in the wall temperature of the flame tube, seriously affecting the service life of the flame tube.

[0055] So far, the technical solution of the present application has been described in conjunction with the preferred embodiments shown in the accompanying drawings. Those skilled in the art should understand that the scope of protection of the present application is obviously not limited to these specific embodiments. Without departing from the principles of the present application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the scope of protection of the present application.

Claims

1. A method for adjusting the quality of the outlet temperature field of a gas turbine combustion chamber with improved design, characterized in that: include: Step 1: Improve the optimal main combustion zone oil-gas ratio FAR of the combustion chamber 主燃区最佳 、Operating oil-gas ratio FAR 工作 , calculate the air distribution ratio R of the main combustion zone of the improved combustion chamber 主燃区 ; Step 2: Improve the air distribution ratio R in the main combustion zone of the combustion chamber 主燃区 And the total effective opening area S of the prototype combustion chamber 总 , the effective opening area S of the main combustion zone of the improved combustion chamber is calculated 主燃区 ; Step 3: Improve the effective opening area S of the main combustion zone of the combustion chamber 主燃区 and the flow coefficient μ of the opening in the main combustion zone 主燃区 , the physical opening area A of the main combustion zone of the improved combustion chamber is calculated 主燃区 ; Step 4: Improve the physical opening area A of the main combustion zone of the combustion chamber 主燃区 , the physical opening area of ​​the main combustion zone of the prototype combustion chamber was adjusted; Step 5: Improve the effective opening area S of the main combustion zone of the combustion chamber 主燃区 The difference between the effective opening area of ​​the main combustion zone of the prototype combustion chamber and △S 主燃区 , as the adjustment amount of the effective opening area on the rear section of the flame tube side wall of the improved combustion chamber △S 火焰筒壁后段 ; Step 6: Adjust the effective opening area on the rear section of the flame tube side wall of the combustion chamber by △S 火焰筒壁后段 and the flow coefficient μ of the opening on the rear section of the flame tube side wall 火焰筒壁后段 , the adjustment amount of the physical opening area on the rear section of the flame tube side wall of the improved combustion chamber is calculated as △A 火焰筒壁后段 ; Step 7: Adjust the amount of physical opening area △A on the rear section of the flame tube side wall of the improved combustion chamber 火焰筒壁后段 , the physical opening area on the rear section of the flame tube side wall of the prototype combustion chamber is adjusted.

2. The method for adjusting the quality of the outlet temperature field of the improved design of the gas turbine combustion chamber according to claim 1, characterized in that: Step 1 is as follows: R 主燃区 =FAR 工作 / FAR 主燃区最佳 。 3. The method for adjusting the quality of the outlet temperature field of the improved design of the gas turbine combustion chamber according to claim 1, characterized in that: Step 2 is as follows: S 主燃区 =R 主燃区 *S 总 。 4. The method for adjusting the quality of the outlet temperature field of the improved design of the gas turbine combustion chamber according to claim 1, characterized in that: Step three is as follows: A 主燃区 =S 主燃区 / m 主燃区 。 5. The method for adjusting the quality of the outlet temperature field of the improved design of the gas turbine combustion chamber according to claim 1, characterized in that: In step 4, when adjusting the physical opening area of ​​the main combustion zone of the prototype combustion chamber, the physical opening area of ​​the head cooling hole is adjusted first. When the adjustment of the physical opening area of ​​the head cooling hole cannot meet the requirements, the physical opening areas of the main combustion hole and the swirler are adjusted in turn.

6. The method for adjusting the quality of the outlet temperature field of the improved design of the gas turbine combustion chamber according to claim 1, characterized in that: Step 6 is as follows: △A 火焰筒壁后段 =△S 火焰筒壁后段 / m 火焰筒壁后段 。 7. The method for adjusting the quality of the outlet temperature field of the improved design of the gas turbine combustion chamber according to claim 1, characterized in that: When adjusting the physical opening area on the rear section of the flame tube side wall of the prototype combustion chamber, the physical opening area of ​​the flame tube mixing air inlet hole is adjusted first. When the physical opening area of ​​the flame tube mixing air inlet hole cannot meet the requirements, the physical opening area of ​​the flame tube cooling air inlet hole is adjusted.

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