A method for adjusting the outlet temperature field quality of an improved gas turbine combustor design

Abstract

This application belongs to the technical field of improved design of gas turbine combustors, and specifically relates to a method for adjusting the quality of the outlet temperature field of an improved design of a gas turbine combustor to improve the optimal main combustion zone oil-gas ratio FAR of the combustor. 主燃区最佳 , working oil-gas ratio FAR 工作 , calculate the air distribution ratio R in 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 , in order to adjust the physical opening area of ​​the main combustion zone of the prototype combustion chamber, it is convenient, fast, theoretically strong, and can ensure better improvement of the temperature field quality of the combustion chamber outlet.

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 is crucial to the life of gas turbine blades. Data shows that a 30°C increase in gas temperature at a radial position on the turbine blades can reduce the blade life by half. Improved gas turbine designs require minimizing the combustion chamber temperature increase to ensure the quality of the combustion chamber outlet temperature field and, consequently, the service life of the turbine blades.

[0003] The combustor outlet temperature field is affected by multiple factors, including combustor air flow distribution, nozzle atomization performance, and swirler characteristics. To reduce development risk and shorten development cycles during combustor design improvements, adjustments to the combustor air flow distribution are often used to lower combustor temperature rise and improve the quality of the combustor 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, in the current improvement and modification design of the combustion chamber, most of them 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 to improve the quality of the combustion chamber outlet temperature field while ensuring that the total effective opening area of ​​the combustion chamber remains unchanged. This technical solution has the following defects in specific application:

[0005] 1) The adjustment 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 may not be able to effectively improve the quality of the combustion chamber outlet temperature field. Alternatively, it is determined by experiments or simulations, which is time-consuming and labor-intensive.

[0006] 2) Considering the cheapness of the improved and modified design, in order to reduce the effective opening area on the rear section of the flame tube side wall, the effective opening area of ​​the cooling holes on the flame tube side wall is mostly reduced. 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 this 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 an improved gas turbine combustor design, comprising:

[0011] Step 1: Improve the optimal main combustion zone oil-gas ratio FAR of the combustion chamber 主燃区最佳 , working oil-gas ratio FAR 工作 , calculate the air distribution ratio R in 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 , adjust the physical opening area of ​​the main combustion zone of the prototype combustion chamber;

[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 △S of the effective opening area on the rear section of the flame tube side wall of the improved combustion chamber 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 , calculate the adjustment amount of the physical opening area on the rear section of the flame tube side wall of the improved combustion chamber △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 , adjust the physical opening area on the rear section of the flame tube side wall of the prototype combustion chamber.

[0018] 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 combustor, 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 outlet temperature field quality of the improved design of the gas turbine combustor, 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 outlet temperature field quality of the improved design of the gas turbine combustor, 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 outlet temperature field quality of the improved design of the gas turbine combustor, 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 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 This 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 this 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 understood as limiting this application. DETAILED DESCRIPTION

[0030] To make the technical solution and its advantages of this application more clear, the technical solution of this application will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described here are only some of the embodiments of this application and are only used to explain this application, not to limit this application. It should be noted that for ease of description, only the parts relevant to this application are shown in the accompanying drawings, and other relevant 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 should have the usual meanings understood by those skilled in the art in the field to which this application belongs. The words indicating orientation used in the description of this application 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 means 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 stipulated 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 combustion chamber inlet air enters the flame tube through the swirler, the head cooling hole, the main combustion hole, the flame tube cooling air inlet and the flame tube mixing air inlet, 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. It 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 and the flame tube mixing air inlet. By adjusting the effective opening area of ​​the flame tube mixing air inlet, 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 combustor design.

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

[0036] Improve the optimal fuel-gas ratio FAR in the main combustion zone 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 working oil-gas ratio FAR of the combustion chamber. 工作 It 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 , adjust the physical opening area of ​​the main combustion zone of the prototype combustion chamber.

[0044] The physical opening area of ​​the main combustion zone of the prototype combustion chamber is adjusted to conform to 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 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 △S of the effective opening area on the rear section of the flame tube side wall of the improved combustion chamber 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 , calculate the adjustment amount of the physical opening area on the rear section of the flame tube side wall of the improved combustion chamber △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 test.

[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 , adjust the physical opening area on the rear section of the flame tube side wall of the prototype combustion chamber.

[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 consistent.

[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 combustor to improve the optimal main combustion zone oil-gas ratio FAR of the combustor. 主燃区最佳 , working oil-gas ratio FAR 工作 , calculate the air distribution ratio R in 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 , in order to adjust the physical opening area of ​​the main combustion zone of the prototype combustion chamber, it is convenient, fast, theoretically strong, and can ensure better improvement of the temperature field quality of the combustion chamber outlet.

[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 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 It 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.

[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 replacements to the relevant technical features, and the technical solutions after these changes or replacements 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 , working oil-gas ratio FAR 工作 , calculate the air distribution ratio R in 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 , adjust the physical opening area of ​​the main combustion zone of the prototype combustion chamber; 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 △S of the effective opening area on the rear section of the flame tube side wall of the improved combustion chamber 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 , calculate the adjustment amount of the physical opening area on the rear section of the flame tube side wall of the improved combustion chamber △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 , adjust the physical opening area on the rear section of the flame tube side wall of the prototype combustion chamber.

2. The method for adjusting the outlet temperature field quality of a 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 outlet temperature field quality of a 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 outlet temperature field quality of a gas turbine combustor 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 outlet temperature field quality of a gas turbine combustor 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 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 combustor according to claim 1, characterized in that: Step six 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 outlet temperature field quality of a gas turbine combustor 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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