Gas turbine exhaust injection adjusting device and exhaust injection adjusting method thereof

Abstract

The invention provides a gas turbine exhaust injection adjusting device and an exhaust injection adjusting method thereof, the gas turbine exhaust injection adjusting device comprises an injection cylinder and an exhaust cylinder assembly which are coaxially arranged, and an annular injection channel is formed between the injection cylinder and the exhaust cylinder assembly. The exhaust cylinder assembly is sequentially composed of a transition section, an installation connecting section, a mixing section and an exhaust section, the installation connecting section is formed by tightly butting front and rear installation edges which are matched with each other, the mixing section is provided with a pressure measuring device, and the exhaust section is provided with an angle-adjustable airflow adjusting piece. Closed-loop control is formed by monitoring the pressure of the mixing section in real time and dynamically adjusting the opening degree of the air flow adjusting piece, and accurate adjustment of the injected air flow is achieved. The method has the beneficial effects that the temperature of a turbine shell can be effectively reduced, the exhaust back pressure is optimized, and the operation efficiency and working condition adaptability of the gas turbine are remarkably improved; and meanwhile, the overall structure is stable, connection is tight, good sealing performance, vibration resistance and high-temperature and high-pressure resistance are achieved, and the problems of adjustment lag and insufficient structural reliability in the prior art are solved.

Description

Technical Field

[0001] This invention relates to the technical field of gas turbines and gas turbine generator sets, specifically to a gas turbine exhaust ejector regulating device and its exhaust ejector regulating method. Background Technology

[0002] Gas turbines generate high-temperature, high-pressure, and high-speed exhaust gases during operation. Directly discharging this exhaust not only wastes energy but also causes excessive heat to rise in components such as the turbine casing, affecting engine efficiency, reliability, and lifespan. To address this issue, exhaust ejector devices are widely used in gas turbine exhaust systems. Their basic principle is to utilize the high-speed flow of the main exhaust gas to eject and entrain cooling air from the external environment, creating a mixed airflow that cools the turbine casing and regulates exhaust back pressure.

[0003] However, existing ejector devices have some common problems: First, the adjustment of ejector gas flow rate is often not sensitive and precise enough, making it difficult to adapt to the dynamic changes of gas turbines under different operating conditions; second, the internal pressure of the exhaust system is difficult to monitor online in real time and accurately, resulting in lag in adjustment; third, under harsh operating conditions of high pressure, high speed, and high temperature, the structural stability and sealing of the device face severe challenges, which can easily lead to vibration, leakage and structural fatigue, affecting the overall reliability and safety of operation.

[0004] Therefore, there is an urgent need in this field for a gas turbine exhaust ejector regulating device that can achieve dynamic and precise adjustment of ejector airflow, has online pressure detection capability, and is structurally robust, well-sealed, and resistant to high temperature and high pressure. Summary of the Invention

[0005] The purpose of this invention is to provide a gas turbine exhaust ejector regulating device and its exhaust ejector regulating method, which aims to achieve dynamic and precise regulation of the ejector airflow and has the ability to detect exhaust pressure online in real time. At the same time, its structural design can ensure long-term stable and reliable operation under high temperature, high pressure and high speed airflow environment.

[0006] According to one objective of the present invention, the present invention provides a gas turbine exhaust ejector regulating device, comprising an ejector tube and an exhaust stack assembly coaxially sleeved outside the ejector tube; The inlet end of the ejector tube is used to receive the main exhaust gas generated by the gas turbine; An annular ejector channel is formed between the exhaust stack assembly and the outer wall of the ejector tube for ejecting cooling airflow. The exhaust stack assembly includes, in sequence along the airflow direction, a transition section, a mounting and connecting section, a mixing section, and an exhaust section; The mounting connection section includes a front mounting edge and a rear mounting edge; The mixing section is equipped with a pressure measuring device for real-time detection of airflow pressure; An exhaust regulating device is provided in the exhaust section. The exhaust regulating device includes an adjustable airflow regulating plate, which is used to dynamically adjust the size of the ejector airflow in the ejector channel.

[0007] Furthermore, the front mounting edge and the rear mounting edge are tightly connected through a mating structure and fixedly connected by fasteners.

[0008] Furthermore, the transition section includes a transition cylinder and a transition cone connected by welding, wherein the large-diameter end of the transition cone is connected to the transition cylinder, and the small-diameter end is connected to the mounting connection section.

[0009] Furthermore, the outer wall of the mixing section is provided with a long flange edge to enhance the structural strength.

[0010] Furthermore, the pressure measuring device is welded and fixed to the cylinder wall of the mixing section.

[0011] Furthermore, the airflow regulating vane in the exhaust regulating device is a louvered regulating vane or a butterfly valve regulating vane.

[0012] Furthermore, the exhaust section also includes a guide tube, and the exhaust regulating device is disposed at the end of the guide tube; the end of the exhaust tube assembly is connected to an external fixed structure via a round flange.

[0013] Furthermore, a gasket is provided at the connection between the circular flange and the guide tube.

[0014] Furthermore, it also includes a control system, which is signal-connected to the pressure measuring device and the exhaust regulating device, and is used to control the opening of the airflow regulating vane according to the pressure signal detected by the pressure measuring device, so as to realize closed-loop control of the ejector airflow.

[0015] According to a second objective of the present invention, the present invention provides an exhaust jet adjustment method for the above-mentioned gas turbine exhaust jet adjustment device, comprising the following steps: The airflow pressure in the mixing section is monitored in real time by the pressure measuring device. Based on the deviation between the monitored airflow pressure and the target pressure, the opening of the airflow regulating plate in the exhaust regulating device is adjusted to change the exhaust back pressure, thereby dynamically adjusting the size of the ejector airflow through the ejector channel.

[0016] This invention utilizes a unique structural design of the ejector and exhaust stack components to form an annular ejector channel between them, automatically ejecting cooling airflow using the high-speed flow of the main exhaust. Combined with real-time pressure monitoring of the mixing section and the linkage of adjustable airflow vanes in the exhaust section, dynamic and precise closed-loop control of the ejector airflow is achieved. This device effectively reduces turbine casing temperature, optimizes exhaust back pressure, and significantly improves the operating efficiency and reliability of the gas turbine under different operating conditions. Its overall structure is compact and tightly connected, possessing excellent high-temperature and high-pressure resistance and stability, solving problems such as adjustment lag, poor sealing, and susceptibility to vibration in existing technologies. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a cross-sectional structural diagram of an embodiment of the present invention; In the diagram: 1. Injector tube; 2. Transition tube; 3. Transition cone; 4. Front mounting edge; 5. Rear mounting edge; 6. Mixing section; 7. Circular flange; 8. Flow guide tube; 9. Exhaust regulating device; 10. Pressure measuring device. Detailed Implementation

[0019] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they may refer to a fixed connection, a detachable connection, or an integral connection; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or an indirect connection through an intermediate medium; and they may refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0022] Example 1 like Figure 1 As shown, this embodiment of a gas turbine exhaust ejector regulating device includes an ejector tube 1 and an exhaust pipe assembly coaxially sleeved outside the ejector tube 1; The inlet end of ejector tube 1 is used to receive the main exhaust gas generated by the gas turbine; An annular ejector channel is formed between the exhaust stack assembly and the outer wall of the ejector tube 1 for ejecting cooling airflow; The exhaust stack assembly includes, in sequence along the airflow direction, a transition section, a mounting and connecting section, a mixing section 6, and an exhaust section; The transition section includes a transition cylinder 2 and a transition cone 3. The large-diameter end of the transition cone 3 is connected to the transition cylinder 2, and the small-diameter end is connected to the installation connection section. The transition cylinder 2 and the transition cone 3 are connected by welding.

[0023] The mounting connection section includes a detachable front mounting edge 4 and a rear mounting edge 5. The front mounting edge 4 and the rear mounting edge 5 are tightly connected through a mating structure. The mating structure is either a concave-convex fit structure or a stepped fit structure. The front mounting edge 4 and the rear mounting edge 5 are fixedly connected by fasteners.

[0024] The outer wall of the mixing section 6 is provided with a long flange to enhance structural strength. The mixing section 6 is equipped with a pressure measuring device 10 for real-time monitoring of airflow pressure; the pressure measuring device 10 is fixedly installed on the cylinder wall of the mixing section 6. The pressure measuring device 10 is welded to the cylinder wall of the mixing section 6.

[0025] An exhaust regulating device 9 is installed within the exhaust section. The exhaust regulating device 9 includes an adjustable-angle airflow regulating vane for dynamically adjusting the magnitude of the ejector airflow in the ejector channel. The airflow regulating vane in the exhaust regulating device 9 is either a louvered regulating vane or a butterfly valve regulating vane.

[0026] The exhaust section also includes a guide tube 8, and an exhaust regulating device 9 is located at the end of the guide tube 8. The end of the exhaust tube assembly is connected to an external fixed structure via a circular flange 7, which is connected to the guide tube 8. A gasket is provided at the connection between the circular flange 7 and the guide tube 8.

[0027] In this embodiment, the outlet end of the ejector tube 1 extends into the internal space of the mixing section 6. The front mounting edge 4 is welded to the transition section, and the rear mounting edge 5 is welded to the mixing section 6.

[0028] It also includes a control system, which is signal-connected to the pressure measuring device 10 and the exhaust regulating device 9, and is used to control the opening of the airflow regulating vane according to the pressure signal detected by the pressure measuring device 10. The control system is configured to: when the detected pressure is higher than a preset target value, control the airflow regulating vane to close to increase the ejector airflow; when the detected pressure is lower than the preset target value, control the airflow regulating vane to open to decrease the ejector airflow.

[0029] A gas turbine includes the aforementioned gas turbine exhaust ejector regulating device.

[0030] A gas turbine generator set includes the gas turbine described above.

[0031] The exhaust ejector regulation method of the above-mentioned gas turbine exhaust ejector regulation device includes the following steps: The airflow pressure in the mixing section 6 is monitored in real time by the pressure measuring device 10; Based on the deviation between the monitored airflow pressure and the target pressure, the opening of the airflow regulating plate in the exhaust regulating device 9 is adjusted to change the exhaust back pressure, thereby dynamically adjusting the size of the ejector airflow through the ejector channel.

[0032] Example 2 like Figure 1 As shown, this embodiment discloses a gas turbine exhaust ejector regulating device, comprising an ejector tube 1 and an exhaust stack assembly. The ejector tube 1 is located at the center, and its inlet end is connected to the exhaust outlet of the gas turbine to guide the high-temperature, high-pressure main exhaust. The exhaust stack assembly is coaxially sleeved on the outside of the ejector tube 1.

[0033] An annular gap, or ejector channel, is formed between the outer wall of ejector tube 1 and the inner wall of the exhaust pipe assembly. According to the ejector principle in fluid mechanics, when the main exhaust flows through the outlet of ejector tube 1 at high speed, a negative pressure is generated at the inlet of the ejector channel, thereby automatically ejecting the cooling air from the external environment.

[0034] The exhaust stack assembly includes, in sequence along the airflow direction: Transition section: It is formed by welding together a cylindrical transition tube 2 and a conical transition cone 3, and is used to smoothly guide and contract the cooling airflow from the ejector channel.

[0035] The mounting connection section includes a front mounting edge 4 and a rear mounting edge 5. The front mounting edge 4 is welded to the small-diameter end of the transition cone 3, and the rear mounting edge 5 is welded to the rear mixing section 6. The front and rear mounting edges 4 and 5 are detachably connected by bolts. To ensure no leakage under high pressure and high speed, the mating surfaces of both are machined into a mutually fitting concave-convex structure or a stepped structure, so that they can fit tightly when the bolts are tightened, eliminating gaps.

[0036] Mixing section 6: This is a cylindrical section whose internal space is the area where the main exhaust air and the ejected cooling air are thoroughly mixed. The outlet end of the ejector tube 1 extends into the interior of mixing section 6. A long, circumferentially extending flange is welded to the outer wall of the mixing section 6. This structure greatly enhances the rigidity and strength of mixing section 6 and effectively suppresses structural vibrations that may be caused by airflow pulsation. A pressure measuring device 10 (such as a pressure sensor tapping tube) is welded to the wall of mixing section 6 to monitor the pressure of the mixed airflow in real time.

[0037] Exhaust section: Includes a guide tube 8 and an exhaust regulating device 9 at its end. The guide tube 8 is connected to the gas turbine housing or external fixed structure via a circular flange 7, providing fixed support for the entire exhaust stack assembly. To reduce vibration transmission and wear, a high-temperature resistant metal gasket or elastic gasket (not shown) is installed between the circular flange 7 and the guide tube 8. The exhaust regulating device 9 contains one or more airflow regulating vanes (such as louvered or butterfly valve structures) that can rotate around an axis. By driving these airflow regulating vanes to change their angle through an external actuator (such as a motor or hydraulic cylinder, not shown), the exhaust flow area and back pressure can be changed, thereby influencing the ejection effect of the ejector channel and achieving dynamic adjustment of the ejector airflow magnitude.

[0038] The working process of this embodiment: After the gas turbine starts, high-temperature, high-pressure exhaust gas enters the ejector tube 1 and is ejected at high speed. This high-speed airflow ejects external cooling air through the ejector channel into the exhaust stack assembly. The cooling airflow is guided through the transition section and mixes with the main exhaust gas in the mixing section 6, cooling the main exhaust gas and the turbine outer casing. The pressure measuring device 10 monitors the pressure in the mixing section 6 in real time. Based on the deviation between this pressure signal and the target value, the control system drives the airflow regulating vane in the exhaust regulating device 9 to operate. If it is necessary to increase the ejector cooling gas flow rate, the regulating vane is closed to increase the back pressure and enhance the ejection effect; conversely, the regulating vane is opened. This forms a closed-loop control, ensuring that the gas turbine obtains suitable cooling and exhaust conditions under various operating conditions.

[0039] This invention provides real-time pressure signal feedback through a pressure measuring device, which then controls the airflow regulating vanes in the exhaust gas regulating device. This enables dynamic, closed-loop, and precise control of the ejector airflow magnitude, allowing for rapid response to changes in gas turbine operating conditions and optimizing cooling and exhaust back pressure. The pressure measuring device integrated into the mixing section provides online real-time monitoring of pressure in key parts of the exhaust system, offering direct data support for regulation, control, and status monitoring.

[0040] The installation connection section of this invention features a matching front and rear mounting edges, secured with bolts, effectively preventing gap leakage under high-pressure, high-speed airflow and ensuring airtightness and structural stability. The long flange design of the mixing section enhances overall structural rigidity and effectively prevents airflow-induced vibration. The invention's rational structural layout and vibration-damping gasket design at the round flange jointly guarantee the long-term operational reliability and service life of the device under harsh operating conditions. Installation, disassembly, and maintenance are more convenient and faster, improving production efficiency and economy.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A gas turbine exhaust ejector regulating device, characterized in that, It includes an ejector tube and an exhaust pipe assembly coaxially sleeved outside the ejector tube; The inlet end of the ejector tube is used to receive the main exhaust gas generated by the gas turbine; An annular ejector channel is formed between the exhaust stack assembly and the outer wall of the ejector tube for ejecting cooling airflow. The exhaust stack assembly includes, in sequence along the airflow direction, a transition section, a mounting and connecting section, a mixing section, and an exhaust section; The mounting connection section includes a front mounting edge and a rear mounting edge; The mixing section is equipped with a pressure measuring device for real-time detection of airflow pressure; An exhaust regulating device is provided in the exhaust section. The exhaust regulating device includes an adjustable airflow regulating plate, which is used to dynamically adjust the size of the ejector airflow in the ejector channel.

2. The gas turbine exhaust ejector regulating device according to claim 1, characterized in that, The front mounting edge and the rear mounting edge are tightly connected through a mating structure and fixedly connected by fasteners.

3. The gas turbine exhaust ejector regulating device according to claim 1, characterized in that, The transition section includes a transition cylinder and a transition cone connected by welding. The large-diameter end of the transition cone is connected to the transition cylinder, and the small-diameter end is connected to the mounting connection section.

4. The gas turbine exhaust ejector regulating device according to claim 1, characterized in that, The outer wall of the mixing section is provided with a long flange edge to enhance the structural strength.

5. The gas turbine exhaust ejector regulating device according to claim 1, characterized in that, The pressure measuring device is welded and fixed to the cylinder wall of the mixing section.

6. The gas turbine exhaust ejector regulating device according to claim 1, characterized in that, The airflow regulating vane in the exhaust regulating device is either a louvered regulating vane or a butterfly valve regulating vane.

7. The gas turbine exhaust ejector regulating device according to claim 1, characterized in that, The exhaust section also includes a guide tube, and the exhaust regulating device is located at the end of the guide tube; the end of the exhaust tube assembly is connected to an external fixed structure via a round flange.

8. The gas turbine exhaust ejector regulating device according to claim 7, characterized in that, A gasket is provided at the connection between the circular flange and the guide tube.

9. The gas turbine exhaust ejector regulating device according to claim 1, characterized in that, It also includes a control system, which is signal-connected to the pressure measuring device and the exhaust regulating device, and is used to control the opening of the airflow regulating plate according to the pressure signal detected by the pressure measuring device, so as to realize closed-loop control of the ejector airflow.

10. The exhaust jet adjustment method of the gas turbine exhaust jet adjustment device according to any one of claims 1-9, characterized in that, Includes the following steps: The airflow pressure in the mixing section is monitored in real time by the pressure measuring device. Based on the deviation between the monitored airflow pressure and the target pressure, the opening of the airflow regulating plate in the exhaust regulating device is adjusted to change the exhaust back pressure, thereby dynamically adjusting the size of the ejector airflow through the ejector channel.

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