Shrinkage-diffusion spray pipe device capable of controlling scaling ratio in supercritical carbon dioxide non-equilibrium condensation process

Abstract

The utility model discloses a contraction-diffusion spray pipe device capable of controlling the scaling ratio in the supercritical carbon dioxide non-equilibrium condensation process, which comprises a contraction-diffusion spray pipe device body, one end of the contraction-diffusion spray pipe device body is provided with a scaling spray pipe inlet, and the other end of the contraction-diffusion spray pipe device body is provided with a scaling spray pipe outlet. A convergent-divergent spray pipe flow channel is communicated between the convergent-divergent spray pipe inlet and the convergent-divergent spray pipe outlet; supercritical carbon dioxide fluid flows in from an inlet of the convergent-divergent spray pipe and flows out from an outlet of the convergent-divergent spray pipe through a flow channel of the convergent- According to the utility model, the plurality of pressure measurement movable modules and temperature measurement movable modules with the nozzle sliding modules are arranged, the nozzle structure does not need to be replaced, and the nozzle structure shape is dynamically controlled through the modularized structure arrangement, so that different fluid expansion rate conditions are matched.

Description

Technical Field

[0001] The utility model relates to a contraction-diffusion nozzle device capable of controlling the scaling ratio in a supercritical carbon dioxide non-equilibrium condensation process, in particular to a supercritical carbon dioxide non-equilibrium condensation contraction-diffusion nozzle dynamic control technology method, belonging to the supercritical carbon dioxide non-equilibrium condensation experimental technology field. Background Art

[0002] Thanks to the in-depth research on the theory of supercritical carbon dioxide closed Brayton cycle system, as well as the rapid development of high-speed light rotor manufacturing technology and related processes, the supercritical carbon dioxide power cycle power generation system is in the stage of key technology breakthrough and practical application research. With the gradual advancement of industrial tests, the reliability application of core power components such as turbines and compressors in its power cycle system under high parameter operation has gradually become the latest technical difficulty in this field, and has also become one of the key factors restricting the safe, reliable, economical and sustainable operation of supercritical carbon dioxide power generation systems in the future industrial application process. In 2014, the Sandia National Laboratory in the United States first observed the blade damage of the centripetal turbine during the test of the supercritical carbon dioxide closed Brayton cycle system it constructed. The blade damage phenomenon was relatively obvious at the trailing edge of the supercritical carbon dioxide centripetal turbine moving blade, and more serious damage and fracture occurred at the trailing edge of the stationary blade. With the increase of power and the improvement of operating parameters of the supercritical carbon dioxide power generation test system, the blade damage phenomenon of the core power component centripetal turbine has become more and more serious.

[0003] One of the important reasons for the above blade damage is that the condensed droplets formed during the rapid expansion flow of SCO2 in the high-speed centripetal turbine cascade flow channel eroded the blades and caused damage. The formation of SCO2 droplets in the cascade flow channel is a non-equilibrium condensation flow process under the coupling of thermal imbalance and dynamic imbalance, including two processes of droplet nucleation and droplet dynamic growth, involving heat and mass transfer between droplets and surrounding fluids, and between droplets. It is a very complex phase change process. There are two important imbalance characteristics in the phase transition of SCO2 fluid nucleation and growth. One is the thermal imbalance caused by supersaturated expansion, that is, the imbalance caused by the temperature difference between droplets and fluid. This unbalanced supersaturated state is restored to a balanced fluid state through nucleation and condensation processes, which is called thermal recovery; the other is the dynamic imbalance caused by droplets with different dynamic characteristics entrained in the high-speed steam flow, that is, the imbalance caused by the speed difference between droplets and fluid. The recovery of the fluid from a state lower than the steam flow speed to a balanced state equal to the steam flow speed is called inertial recovery. Therefore, experimental research on the non-equilibrium condensation process of supercritical carbon dioxide is very important, and it provides an important basic guarantee for the safe and reliable operation of supercritical carbon dioxide power generation units.

[0004] At present, in the process of supercritical carbon dioxide equilibrium condensation experiment, the contraction-diffusion nozzle structure is mainly used to form different fluid expansion rates to analyze the non-equilibrium condensation process of the entire fluid. The existing supercritical carbon dioxide contraction-diffusion nozzle experimental platform is a fixed structure, and different contraction-diffusion nozzle structures need to be replaced to achieve different expansion rate conditions. It is impossible to achieve autonomous control without disassembly, and it is impossible to perform autonomous dynamic and precise regulation of the changes in the supercritical carbon dioxide non-equilibrium condensation process under different expansion rate conditions. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a technical solution as follows: a convergence-diffusion nozzle device with a controllable scaling ratio for use in a non-equilibrium condensation process of supercritical carbon dioxide, comprising a convergence-diffusion nozzle device body, wherein one end of the convergence-diffusion nozzle device body is provided with a convergence-diffusion nozzle inlet, and the other end is provided with a convergence-diffusion nozzle outlet, wherein a convergence-diffusion nozzle inlet and a convergence-diffusion nozzle outlet are connected with a convergence-diffusion nozzle flow channel; supercritical carbon dioxide fluid flows in through the convergence-diffusion nozzle inlet, flows out from the convergence-diffusion nozzle outlet through the convergence-diffusion nozzle flow channel;

[0006] The upper part of the convergent-divergent nozzle device is provided with 7 pressure measurement dynamic modules in sequence from the inlet end of the convergent-divergent nozzle to the outlet end of the convergent-divergent nozzle, and an upper outlet dynamic module is provided at the outlet of the convergent-divergent nozzle; the lower part of the convergent-divergent nozzle device is provided with 7 temperature measurement dynamic modules in sequence from the inlet end of the convergent-divergent nozzle to the outlet end of the convergent-divergent nozzle, and a lower outlet dynamic module is provided at the outlet of the convergent-divergent nozzle;

[0007] The pressure measurement dynamic module includes a nozzle sliding module 1, a sliding section 1, a driving structure 1 and a pressure sensor, wherein the driving structure 1 is connected to the driving control device via a data line, and the pressure sensor is connected to the pressure data acquisition device via a data line;

[0008] The temperature measurement dynamic module includes a second nozzle sliding module, a second sliding section, a second driving structure and a temperature measuring device, wherein the second driving structure is connected to the driving control device through a data line, and the temperature measuring device is connected to the temperature data acquisition device through a data line;

[0009] The movable module at the upper outlet includes a nozzle sliding module three, a sliding interval three, and a driving structure three, and the driving structure three is connected to the driving control device through a data line; the movable module at the lower outlet includes a nozzle sliding module four, a sliding interval four, and a driving structure four, and the driving structure four is connected to the driving control device through a data line; the pressure data acquisition device, the driving control device and the temperature data acquisition device are all connected to the computer system through data lines.

[0010] The advantages of the utility model compared with the prior art are: the utility model sets multiple pressure measurement dynamic modules and temperature measurement dynamic modules with nozzle sliding modules, without replacing the nozzle structure, and realizes dynamic control of the nozzle structure shape through modular structure setting to match different fluid expansion rate conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 The utility model is a structural schematic diagram of a contraction-diffusion nozzle device with a controllable scaling ratio used in a non-equilibrium condensation process of supercritical carbon dioxide. DETAILED DESCRIPTION

[0012] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0013] In the description of the embodiments of the present utility model, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate an orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, it is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0014] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components must be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0015] In the description of the embodiments of the present invention, "multiple" means at least 2.

[0016] In the description of the embodiments of the present utility model, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0017] Example:

[0018] A convergence-diffusion nozzle device capable of controlling a zoom ratio in a non-equilibrium condensation process of supercritical carbon dioxide, characterized in that: it comprises a convergence-diffusion nozzle device body, one end of the convergence-diffusion nozzle device body is provided with a convergence-diffusion nozzle inlet 1, and the other end is provided with a convergence-diffusion nozzle outlet 2, and a convergence-diffusion nozzle flow channel 3 is connected between the convergence-diffusion nozzle inlet 1 and the convergence-diffusion nozzle outlet 2; supercritical carbon dioxide fluid flows in through the convergence-diffusion nozzle inlet 1, flows out from the convergence-diffusion nozzle outlet 2 through the convergence-diffusion nozzle flow channel 3;

[0019] The upper part of the convergent-divergent nozzle device is provided with 7 pressure measurement dynamic modules I in sequence from the convergent-divergent nozzle inlet end 1 to the convergent-divergent nozzle outlet end 2, and an upper outlet dynamic module III is provided at the convergent-divergent nozzle outlet 2; the lower part of the convergent-divergent nozzle device is provided with 7 temperature measurement dynamic modules II in sequence from the convergent-divergent nozzle inlet end 1 to the convergent-divergent nozzle outlet end 2, and a lower outlet dynamic module IV is provided at the convergent-divergent nozzle outlet 2;

[0020] The pressure measurement dynamic module I includes a nozzle sliding module 4-1, a sliding section 5-1, a driving structure 6-1 and a pressure sensor 7. The driving structure 6-1 is connected to the driving control device 10 through a data line, and the pressure sensor 7 is connected to the pressure data acquisition device 9 through a data line.

[0021] The temperature measurement module II includes a nozzle sliding module II 4-2, a sliding interval II 5-2, a driving structure II 6-2 and a temperature measuring device 8, wherein the driving structure II 6-2 is connected to the driving control device 10 via a data line, and the temperature measuring device 8 is connected to the temperature data acquisition device 11 via a data line;

[0022] The moving module III at the upper outlet includes a nozzle sliding module III 4-3, a sliding interval III 5-3, and a driving structure III 6-3, and the driving structure III 6-3 is connected to the driving control device 10 through a data line; the moving module IV at the lower outlet includes a nozzle sliding module IV 4-4, a sliding interval IV 5-4, and a driving structure IV 6-4, and the driving structure IV 6-4 is connected to the driving control device 10 through a data line; the pressure data acquisition device 9, the driving control device 10 and the temperature data acquisition device 11 are all connected to the computer system 12 through data lines.

[0023] In the pressure measurement dynamic module I, the sliding section 5-1 and the driving structure 6-1 are sequentially arranged on the side of the nozzle sliding module 4-1 away from the convergent nozzle flow channel 3, the pressure sensor 7 is fixed to the nozzle sliding module 4-1 and is connected to the driving structure 6-1 in transmission, and the driving structure 6-1 controls the nozzle sliding module 4-1 and the pressure sensor 7 to move up and down synchronously in the sliding section 5-1.

[0024] In the temperature measurement dynamic module II, the sliding interval 5-2 and the driving structure 6-2 are sequentially arranged on the side of the nozzle sliding module 4-2 away from the convergent nozzle flow channel 3, the temperature measuring device 8 is fixed to the nozzle sliding module 4-2 and is connected to the driving structure 6-2 in transmission, and the driving structure 6-2 controls the nozzle sliding module 4-2 and the temperature measuring device 8 to move up and down synchronously in the sliding interval 5-2.

[0025] The 7 pressure measurement dynamic modules I and 1 dynamic module III at the upper outlet in the upper part and the 7 temperature measurement dynamic modules II and 1 dynamic module IV at the lower outlet in the lower part are arranged in an up-down symmetrical manner. The 7 pressure measurement dynamic modules I and 1 dynamic module III at the upper outlet in the upper part, a total of 8 modules, are arranged in a left-right symmetrical manner. The 7 temperature measurement dynamic modules II and 1 dynamic module IV at the lower outlet in the lower part, a total of 8 modules, are arranged in a left-right symmetrical manner.

[0026] From the inlet 1 of the convergent-divergent nozzle to the middle throat position of the convergent-divergent nozzle channel 3, which is in the nozzle contraction stage, the lateral spacing of the nozzle sliding modules 4 gradually decreases; from the middle throat of the convergent-divergent nozzle channel 3 to the outlet 2 of the convergent-divergent nozzle, which is in the nozzle diffusion stage, the lateral spacing of the nozzle sliding modules 4 gradually increases, and the proportional relationship between adjacent nozzle sliding modules 4 is: L1=1.14*L2+0.36*M, M is the span size of the pressure sensor 7 or the temperature measuring device 8.

[0027] The seven pressure sensors 7 and the seven temperature measuring devices 8 transmit data in real time to the computer system 12 through the pressure data acquisition device 9 and the temperature data acquisition device 11. Based on the pressure and temperature measurement data, the expansion rate required for the non-equilibrium condensation of supercritical carbon dioxide can be calculated, and then the scaling ratio of the zoom nozzle can be calculated through the expansion rate. According to the required scaling ratio requirement, the computer system 12 uses the drive control device 10 to accurately control the advance or exit of the 14 drive structures 6 in the sliding range 5, so as to realize dynamic control of the zoom nozzle flow channel 3 structure.

[0028] In this embodiment, there is no need to replace the nozzle structure. Through modular structural settings, dynamic control of the nozzle structure shape is achieved to match different fluid expansion rate conditions.

[0029] The above description of the utility model and its implementation methods is not restrictive. The drawings show only one implementation method of the utility model, and the actual structure is not limited thereto. In short, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the invention of the utility model, they should all fall within the protection scope of the utility model.

Claims

1. A contraction-diffusion nozzle device with controllable scaling ratio for use in the non-equilibrium condensation process of supercritical carbon dioxide, characterized in that: The invention comprises a convergent-divergent nozzle device body, wherein one end of the convergent-divergent nozzle device body is provided with a convergent-divergent nozzle inlet (1), and the other end is provided with a convergent-divergent nozzle outlet (2), and a convergent-divergent nozzle flow channel (3) is connected between the convergent-divergent nozzle inlet (1) and the convergent-divergent nozzle outlet (2); a supercritical carbon dioxide fluid flows in through the convergent-divergent nozzle inlet (1), flows through the convergent-divergent nozzle flow channel (3), and flows out from the convergent-divergent nozzle outlet (2); The upper part of the convergent-divergent nozzle device is provided with 7 pressure measurement dynamic modules (I) in sequence from the convergent-divergent nozzle inlet (1) to the convergent-divergent nozzle outlet (2), and an upper outlet dynamic module (III) is provided at the convergent-divergent nozzle outlet (2); the lower part of the convergent-divergent nozzle device is provided with 7 temperature measurement dynamic modules (II) in sequence from the convergent-divergent nozzle inlet (1) to the convergent-divergent nozzle outlet (2), and a lower outlet dynamic module (IV) is provided at the convergent-divergent nozzle outlet (2); The pressure measurement dynamic module (I) comprises a nozzle sliding module (4-1), a sliding interval (5-1), a driving structure (6-1) and a pressure sensor (7), wherein the driving structure (6-1) is connected to a driving control device (10) via a data line, and the pressure sensor (7) is connected to a pressure data acquisition device (9) via a data line; The temperature measurement module (II) comprises a second nozzle sliding module (4-2), a second sliding section (5-2), a second driving structure (6-2) and a temperature measuring device (8), wherein the second driving structure (6-2) is connected to a driving control device (10) via a data line, and the temperature measuring device (8) is connected to a temperature data acquisition device (11) via a data line; The upper outlet moving module (III) comprises a nozzle sliding module three (4-3), a sliding interval three (5-3), and a driving structure three (6-3), and the driving structure three (6-3) is connected to a driving control device (10) via a data line; the lower outlet moving module (IV) comprises a nozzle sliding module four (4-4), a sliding interval four (5-4), and a driving structure four (6-4), and the driving structure four (6-4) is connected to a driving control device (10) via a data line; the pressure data acquisition device (9), the driving control device (10), and the temperature data acquisition device (11) are all connected to a computer system (12) via data lines.

2. A contraction-diffusion nozzle device with controllable scaling ratio for use in non-equilibrium condensation of supercritical carbon dioxide according to claim 1, characterized in that: In the pressure measurement dynamic module (I), a sliding zone (5-1) and a driving structure (6-1) are sequentially arranged on a side of the nozzle sliding module (4-1) away from the convergent-divergent nozzle flow channel (3); the pressure sensor (7) is fixed to the nozzle sliding module (4-1) and is in transmission connection with the driving structure (6-1); the driving structure (6-1) controls the nozzle sliding module (4-1) and the pressure sensor (7) to move up and down synchronously in the sliding zone (5-1).

3. The shrink-diffuse nozzle device with controllable scaling ratio for non-equilibrium condensation of supercritical carbon dioxide according to claim 1, characterized in that: In the temperature measurement dynamic module (II), the sliding interval 2 (5-2) and the driving structure 2 (6-2) are sequentially arranged on the side of the nozzle sliding module 2 (4-2) away from the convergent nozzle flow channel (3), the temperature measuring device (8) is fixed to the nozzle sliding module 2 (4-2) and is transmission-connected to the driving structure 2 (6-2), and the driving structure 2 (6-2) controls the nozzle sliding module 2 (4-2) and the temperature measuring device (8) to move up and down synchronously in the sliding interval 2 (5-2).

4. The shrink-diffuse nozzle device with controllable scaling ratio for non-equilibrium condensation of supercritical carbon dioxide according to claim 1, characterized in that: The 7 pressure measurement dynamic modules (I) and 1 upper outlet dynamic module (III) in the upper part and the 7 temperature measurement dynamic modules (II) and 1 lower outlet dynamic module (IV) in the lower part are arranged in an up-down symmetrical manner; the 7 pressure measurement dynamic modules (I) and 1 upper outlet dynamic module (III) in the upper part, a total of 8 modules, are arranged in a left-right symmetrical manner; the 7 temperature measurement dynamic modules (II) and 1 lower outlet dynamic module (IV) in the lower part, a total of 8 modules, are arranged in a left-right symmetrical manner.

5. The shrink-divergence nozzle device with controllable scaling ratio for non-equilibrium condensation of supercritical carbon dioxide according to claim 1, characterized in that: From the inlet of the convergent-divergent nozzle (1) to the middle throat position of the convergent-divergent nozzle flow channel (3), which is in the nozzle contraction stage, the lateral spacing of the nozzle sliding modules (4) gradually decreases; from the middle throat of the convergent-divergent nozzle flow channel (3) to the outlet of the convergent-divergent nozzle (2), which is in the nozzle diffusion stage, the lateral spacing of the nozzle sliding modules (4) gradually increases, and the proportional relationship between adjacent nozzle sliding modules (4) is: L1 = 1.14*L2+0.36*M, where M is the span size of the pressure sensor (7) or the temperature measuring device (8).

6. The shrink-divergence nozzle device with controllable scaling ratio for non-equilibrium condensation of supercritical carbon dioxide according to claim 1, characterized in that: The seven pressure sensors (7) and the seven temperature measuring devices (8) transmit data in real time to a computer system (12) through a pressure data acquisition device (9) and a temperature data acquisition device (11). Based on the pressure and temperature measurement data, the expansion rate required for the non-equilibrium condensation of supercritical carbon dioxide can be calculated, and then the scaling ratio of the zoom nozzle can be calculated through the expansion rate. According to the required scaling ratio requirements, the computer system (12) controls the 14 drive structures (6) to move or exit accurately in the sliding range (5) through the drive control device (10), thereby realizing dynamic control of the zoom nozzle flow channel (3) structure.

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