Supersonic speed condensation phase change process in-situ online monitoring system and method

Abstract

The invention relates to the technical field of supersonic speed condensation phase change, in particular to a supersonic speed condensation phase change process in-situ online monitoring system and method.The supersonic speed condensation phase change process in-situ online monitoring system comprises a supersonic speed condensation generation device used for accelerating mixed gas containing condensable components to supersonic speed and generating condensation phase change; the first monitoring module is used for acquiring a liquid drop image in real time; the second monitoring module is used for monitoring process parameters of the mixed gas in real time; and the data acquisition and processing module is used for controlling the first monitoring module and the second monitoring module to perform synchronous data acquisition by adopting a unified time reference, and the data acquisition and processing module stores the acquired liquid drop images and the process parameters in the integrated database module in an associated manner so as to construct an association model between the liquid drop images and the process parameters. According to the device and the method, the liquid drop state can be continuously and visually monitored in real time in a complex supersonic flowing environment, and accurate and comprehensive data support is provided for deeply researching the condensation nucleation and liquid drop growth process in the supersonic condensation phase change process.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of supersonic condensation phase change, and in particular to a system and method for in-situ online monitoring of a supersonic condensation phase change process. BACKGROUND

[0002] As a new gas processing technology, supersonic cyclone separation has attracted extensive attention in recent years due to its compact structure, stable operation, high separation efficiency, energy saving and environmental protection, etc. The technology mainly uses a Laval nozzle to accelerate the mixed gas containing condensable components to supersonic speed. The gas expands adiabatically in the nozzle, causing the pressure and temperature to drop rapidly, thereby inducing the condensation phase change of the condensable components in the gas to form liquid droplets. Subsequently, the high-speed gas flow enters the cyclone structure, and the liquid droplets are separated from the high-speed gas flow under the action of strong cyclone centrifugal force, realizing an efficient gas-liquid separation process. As a core component, the supersonic condensation phase change process occurring inside the Laval nozzle is the key to affecting the separation performance. This process mainly includes two stages of condensation nucleation and droplet growth. Among them, the particle size distribution and number density of the droplets are the key parameters for evaluating the quality of the supersonic condensation and the subsequent separation efficiency. If the size of the generated droplets is too small, they are easily entrained by the high-speed gas flow and thus difficult to be effectively separated by the cyclone device. If the size of the generated droplets is too large, although they are easily affected by the centrifugal force, the number of nucleation is small, which limits the overall separation amount. In addition, the number density of the droplets determines the liquid mass per unit time, which also affects the processing capacity of the entire device. At the same time, process parameters such as pressure, temperature and flow rate will also affect the supersonic condensation phase change process.

[0003] At present, existing researches mainly focus on non-contact measurement and visualization research of specific physical quantities or single parameters. Although the existing technical solutions have achieved certain results in gas component measurement, particle size identification or condensation behavior visualization observation in specific scenarios, they have not realized in-situ online monitoring of condensation nucleation, droplet growth and distribution law in a supersonic flow environment. Moreover, there is a lack of synchronous control between the measurement channels in the existing technology, and real-time collection and correlation analysis of droplet parameters and key process parameters such as pressure, temperature and flow rate cannot be realized. SUMMARY

[0004] In order to solve the problem that existing researches cannot realize in-situ online monitoring of the supersonic condensation phase change process, the present application provides a system and method for in-situ online monitoring of a supersonic condensation phase change process.

[0005] In one aspect, the present application provides a system for in-situ online monitoring of a supersonic condensation phase change process, which adopts the following technical solution: A system for in-situ online monitoring of a supersonic condensation phase change process, comprising: The application relates to an ultrasonic condensation generating device for accelerating a mixed gas containing condensable components to an ultrasonic speed and generating a condensation phase change. A first monitoring module is arranged at the ultrasonic condensation generating device and is used for acquiring liquid drop images in real time; A second monitoring module is used for monitoring process parameters of the mixed gas in real time; A data acquisition and processing module comprises an image recognition and data analysis unit and a multi-channel synchronous data acquisition unit; and An integrated database module; The data acquisition and processing module adopts a unified time reference, controls the first monitoring module and the second monitoring module to perform synchronous data acquisition, and stores the acquired liquid drop images and process parameters in the integrated database module in association, so as to construct an association model between the liquid drop images and the process parameters.

[0006] By adopting the technical scheme, the in-situ monitoring method based on the visual principle can realize real-time and continuous monitoring of liquid drop states in a complex ultrasonic flow environment through special optical imaging technology, high-speed camera equipment and a data processing algorithm matched with the optical imaging technology and the high-speed camera equipment, and can provide accurate and comprehensive data support for in-depth research on condensation nucleation and liquid drop growth in the ultrasonic condensation phase change process; the integrated database adopts a unified time reference to control the one-to-one correspondence between image frames and process parameters, and can realize process monitoring and optimization through visual platforms, intuitively and clearly show multi-source data trends, improve the stability and condensation efficiency of the ultrasonic condensation phase change process, and is especially suitable for natural gas purification and other fields.

[0007] In some embodiments, the ultrasonic condensation generating device is connected with an inlet pipe at one end and an outlet pipe at the other end, and comprises: A mounting bracket is provided with a main flow channel communicated with the inlet pipe and the outlet pipe, and the main flow channel comprises: A steady flow section connected with the inlet pipe; A Laval nozzle comprising a converging section, a throat and a diverging section, the converging section being connected with one end of the steady flow section away from the inlet pipe, the throat being connected with one end of the converging section away from the steady flow section, the diverging section being connected with one end of the throat away from the converging section, and one end of the diverging section away from the throat being communicated with the outlet pipe.

[0008] In some embodiments, the mounting bracket comprises a first transparent plate, a center piece and a second transparent plate, the main flow channel is arranged in the center piece, the first transparent plate and the second transparent plate are arranged on two sides in the axial direction of the inlet pipe respectively, and the first transparent plate and the second transparent plate are detachably connected with the center piece. The central piece comprises a first enclosing plate, a second enclosing plate, a first fixing block and a second fixing block, the first fixing block and the second fixing block are both stainless steel plates, the main flow channel is formed by the first enclosing plate, the second enclosing plate, the first fixing block and the second fixing block, and the first enclosing plate and the second enclosing plate are both transparent plates.

[0009] In some embodiments, the mounting bracket further comprises a first mounting plate and a second mounting plate, one side of the first mounting plate is connected with the inlet pipe, the other side is connected with the central piece, one side of the second mounting plate is connected with the outlet pipe, the other side is connected with the side of the central piece away from the inlet pipe, a plurality of connecting rods are arranged between the first mounting plate and the second mounting plate, the first mounting plate and the second mounting plate are detachably connected through the connecting rods, a first through slot is formed in the first mounting plate and communicates the inlet pipe and the main flow channel, and the shape of the first through slot transitions from a circle to a rectangle in the direction from the inlet pipe to the central piece.

[0010] In some embodiments, the first monitoring module comprises: a light source arranged towards the expansion section, the light source being configured to generate a parallel backlight to illuminate an observation region in the expansion section; a camera equipped with a microscope lens, the camera being arranged opposite the observation region, the camera and the light source being arranged on two sides of the axis direction of the inlet pipe, the camera being arranged opposite the light source, and the camera being configured to capture images of the liquid droplets at a frame rate greater than or equal to 10000 fps; and a diffuser arranged between the light source and the observation region.

[0011] In some embodiments, the process parameters include pressure parameters, temperature parameters and flow parameters, and the second monitoring module comprises: a plurality of pressure sensors in communication with the main flow channel, configured to collect pressure parameters in the main flow channel; a temperature sensor arranged at the inlet pipe and / or the outlet pipe, configured to collect temperature parameters; and a flow meter arranged at the inlet pipe and / or the outlet pipe, configured to collect flow parameters.

[0012] In some embodiments, a plurality of micro-holes are formed in the first fixing block, the micro-holes are arranged perpendicular to the axis of the inlet pipe, and the pressure sensors are arranged in the micro-holes.

[0013] In some embodiments, the first data processing path is configured to process the images of the liquid droplets, and sequentially performs image preprocessing, image segmentation and parameter extraction, and liquid droplet parameter calculation and analysis; the second data processing path is configured to process process sensor signals, and performs multi-channel data acquisition, data grouping and buffering, and transmission through a gigabit network; The first data processing path and the second data processing path run in parallel based on a unified time reference, and the output results are synchronously sent to the integrated database module.

[0014] In another aspect, the application also provides an in-situ online monitoring method for a supersonic condensation phase change process, based on the above-mentioned in-situ online monitoring system for a supersonic condensation phase change process, comprising the following steps: The mixed gas is accelerated and condensed to generate droplets in the supersonic condensation device; The first monitoring module is used to acquire droplet images in real time, and droplet parameters are extracted through an image processing algorithm; The second monitoring module is used to synchronously collect process parameters of the mixed gas; The extracted droplet parameters and the collected process parameters are associated based on a unified time reference, and are stored in an integrated database; and Based on the associated and stored data, an association model between the droplet parameters and the process parameters is constructed, and is displayed through a visualization platform.

[0015] In some embodiments, the image processing algorithm comprises image preprocessing, image segmentation, feature recognition and parameter extraction steps, the extracted droplet parameters comprise droplet size distribution and number density, and the process parameters comprise temperature parameters, pressure parameters and flow parameters.

[0016] By adopting the above technical solution, the changes in process parameters such as pressure, temperature and flow indirectly reflect the condensation nucleation and droplet growth process, the real-time collection of process parameters is realized through a multi-channel synchronous collection system, the droplet parameter data are coupled, the association model between the droplet parameters and the process parameters is constructed, and the internal mechanism of the supersonic spontaneous condensation process is analyzed in depth.

[0017] Compared with the prior art, the application has at least one of the following beneficial technical effects: 1. The application can associate the micro-generation and growth process of droplets with macro-process parameters in a real environment maintaining supersonic flow, breaking the limitation of traditional methods that can only be analyzed after the event or single parameter measurement, and providing accurate and comprehensive data support for in-depth study of the condensation nucleation and droplet growth process in the supersonic condensation phase change process; 2. By establishing an accurate association model between droplet key parameters (such as size distribution) and process conditions (such as inlet pressure and temperature), an operator can intuitively understand how process parameters affect the final condensation effect, so as to be able to adjust the working condition in real time, directional optimization, and finally realize the goal of improving the condensation efficiency and ensuring the stable operation of the separation process; 3. By redesigning the structure of the ultrasonic condensation generator, a modular ultrasonic condensation generator was established, which is not only easy to assemble, disassemble and maintain, and applicable to various industrial scenarios such as natural gas purification and light hydrocarbon recovery, but also facilitates real-time observation and recording of the state of droplets. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application; Figure 2 This is an internal sectional view of an embodiment of this application; Figure 3 This is a schematic diagram of the structure of the mainstream channel in the embodiments of this application; Figure 4 This is an exploded view of the mounting bracket in an embodiment of this application; Figure 5 This is an internal sectional view of an embodiment of this application; Figure 6 This is a flowchart of the data acquisition and processing module and the integrated database in the embodiments of this application.

[0019] In the picture: 1. Supersonic condensation generator; 12. Main flow channel; 13. Flow stabilization section; 14. Laval nozzle; 141. Contraction section; 142. Throat; 143. Expansion section; 2. Mounting bracket; 21. First transparent plate; 22. Central component; 221. First enclosure plate; 222. Second enclosure plate; 223. First fixing block; 2231. Micropore; 224. Second fixing block; 23. Second transparent plate; 24. First mounting plate; 241. First through groove; 25. Second mounting plate; 26. Connecting rod; 27. First curved surface; 28. Second curved surface; 3. Inlet pipe; 4. Outlet pipe; 5. First monitoring module; 51. Light source; 52. Camera; 53. Diffuser; 61. Temperature sensor; 62. Flow meter. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0021] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the term "and / or" herein is only to describe the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can represent the following three cases: A exists alone, A and B exist together, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects without special explanation.

[0022] The application provides an in-situ online monitoring system for a supersonic condensation phase change process, comprising a supersonic condensation generating device 1, a first monitoring module 5, a second monitoring module, a data acquisition and processing module, and an integrated database module. The supersonic condensation generating device 1 is used to accelerate a mixed gas containing possible components to supersonic speed and cause a condensation phase change. The first monitoring module 5 is arranged at the supersonic condensation generating device 1 and is used to acquire liquid droplet images in real time. The second monitoring module is used to monitor process parameters of the mixed gas in real time. The data acquisition and processing module comprises an image recognition and data analysis unit and a multi-channel synchronous data acquisition unit. The data acquisition and processing module adopts a unified time reference to control the first monitoring module and the second monitoring module to perform synchronous data acquisition. The data acquisition and processing module stores the acquired liquid droplet images and process parameters in association to the integrated database module to construct an association model between the liquid droplet images and the process parameters. By arranging the first monitoring module 5 and the second monitoring module and using the unified time reference to perform synchronous standby and associated storage, the application solves the synchronization problem of optical images and physical signals in a high-speed dynamic process, can accurately construct a dynamic association model between liquid droplet images / parameters and process parameters, and can monitor the liquid droplet state in real time and continuously in a complex environment of supersonic flow, thereby providing accurate and comprehensive data support for in-depth research on the condensation nucleation and liquid droplet growth process in the supersonic condensation phase change process.

[0023] Specifically, in the present embodiment, the supersonic condensation generating device 1 is connected with an inlet pipe 3 at one end and an outlet pipe 4 at the other end, the inlet pipe 3 is used for supplying high-speed airflow into the supersonic condensation generating device 1, and the outlet pipe 4 is used for discharging liquid droplets. The supersonic condensation generating device 1 comprises a mounting bracket 2, the mounting bracket 2 is internally provided with a main flow channel 12, the main flow channel 12 is connected in communication with the inlet pipe 3 at one end and the outlet pipe 4 at the other end, the inlet main flow channel 12 comprises a steady flow section 13 and a Laval nozzle 14, the steady flow section 13 is connected in communication with the inlet pipe 3 at one end and the Laval nozzle 14 at the other end, the Laval nozzle 14 comprises a converging section 141, a throat 142 and a diverging section 143, the converging section 141 is connected with the steady flow section 13 at the end away from the inlet pipe 3, the throat 142 is connected to the converging section 141 at the end away from the steady flow pipe, the diverging section 143 is connected to the throat 142 at the end away from the converging section 141, and the diverging section 143 is connected in communication with the outlet pipe 4 at the end away from the throat 142. The converging section 141 of the Laval nozzle 14 adopts a Vitoshinsky curve, and the diverging section 143 adopts a conical pipe method. The Laval nozzle 14 is a core component, and due to its special structure, the fluid medium can realize the transition from subsonic speed to supersonic speed, and in the diverging section 143, the airflow expands rapidly to form a low-temperature and low-pressure environment, thereby providing conditions for the condensation phase change process of the condensable components.

[0024] Further, in the present embodiment, the mounting bracket 2 comprises a first transparent plate 21, a center piece 22 and a second transparent plate 23, the main flow channel 12 is provided in the center piece 22, the first transparent plate 21 and the second transparent plate 23 are respectively arranged on both sides of the axis direction of the inlet pipe 3, and the first transparent plate 21 and the second transparent plate 23 are detachably connected with the center piece 22; the center piece 22 comprises a first enclosing plate 221, a second enclosing plate 222, a first fixed block 223 and a second fixed block 224, the first fixed block 223 and the second fixed block 224 are both stainless steel plates, the main flow channel 12 is formed by splicing the first enclosing plate 221, the second enclosing plate 222, the first fixed block 223 and the second fixed block 224, and the first enclosing plate 221 and the second enclosing plate 222 are both transparent plates. In other words, in the present embodiment, the Laval nozzle 14 is constructed in a stacking manner, the Laval nozzle 14 is formed by stacking and enclosing the first enclosing plate 221, the second enclosing plate 222, the first fixed block 223 and the second fixed block 224, the wall surface of the first fixed block 223 towards the second fixed block 224 side is a first curved surface 27, the wall surface of the second fixed block 224 towards the first fixed block 223 side is a second curved surface 28, and the first curved surface 27 and the second curved surface 28 jointly form the converging section 141, the throat 142 and the diverging section 143 of the Laval nozzle 14.

[0025] Further, with reference to Figure 6In this embodiment, the main channel 12 has a rectangular cross-section, and the throat 142 of the Laval nozzle 14 also has a rectangular cross-section. The throat 142 of the Laval nozzle 14 has a length L and a width W, where the length L is 1 to 3 times the width W. In other embodiments, the main channel 12 may also be a pipe with a circular cross-section, which is not limited here.

[0026] The first enclosing plate 221 and the second enclosing plate 222 are made of plexiglass, while the first fixing block 223 and the second fixing block 224 are made of stainless steel. The first enclosing plate 221 is connected to the first fixing block 223 and the second fixing block 224 by bolts and fasteners, and the second enclosing plate 222 is also connected to the first fixing block 223 and the second fixing block 224 by bolts and fasteners. All the components of the first enclosing plate 221, the second enclosing plate 222, the first fixing block 223, and the second fixing block 224 are sealed together. This can be achieved by using sealing rings or applying sealant at the joints, which is not limited here. Since the mounting bracket 2 is assembled from the first enclosing plate 221, the second enclosing plate 222, the first fixing block 223, and the second fixing block 224, a modular design is achieved for the mounting bracket 2. This not only facilitates processing and assembly, but also, by designing the first enclosing plate 221 and the second enclosing plate 222 as transparent glass, allows the first monitoring module 5 and the second monitoring module to easily acquire droplet parameters.

[0027] Reference Figures 2 to 4 The mounting bracket 2 also includes a first mounting plate 24 and a second mounting plate 25. One side of the first mounting plate 24 is sealed to the inlet pipe 3, and the other side is sealed to the center member 22. One side of the second mounting plate 25 is sealed to the outlet pipe 4, and the other side is sealed to the side of the center member 22 away from the inlet pipe 3. Multiple connecting rods 26 are provided between the first mounting plate 24 and the second mounting plate 25. The first mounting plate 24 and the second mounting plate 25 are detachably connected by the connecting rods 26. The first mounting plate 24 has a first through groove 241 that connects the inlet pipe 3 and the main channel 12. The shape of the first through groove 241 changes from a circle to a rectangle along the direction from the inlet pipe 3 to the center member 22. By setting the first mounting plate 24 and the second mounting plate 25, a reliable connection between the central component 22 and the inlet pipe 3 and the outlet pipe 4 can be achieved. At the same time, the overall structural design of the mounting bracket 2 facilitates installation and disassembly. The design of the first through groove 241 ensures a smooth transition of high-speed airflow when it enters the main channel 12 from the inlet pipe 3, reducing flow loss and interference. In addition, the first mounting plate 24 and the second mounting plate 25 are connected by a connecting rod 26, which can ensure the overall structural strength and pressure-bearing sealing of the mounting bracket 2.

[0028] Reference Figure 1 and Figure 2Further, in the embodiment, the first monitoring module 5 comprises a light source 51, a camera 52 and a diffuser 53, the light source 51 is arranged towards the divergent section 143 of the Laval nozzle 14, the light source 51 is used to generate parallel backlight to irradiate the observation area in the divergent section 143, the camera 52 is selected as a high-speed camera 52, the camera 52 is equipped with a microscope lens, the camera 52 is arranged to observe the observation area, the camera 52 and the light source 51 are arranged on both sides of the inlet axis direction respectively, the camera 52 is arranged opposite to the light source 51, and the camera 52 is used to shoot the droplet image at a frame rate greater than or equal to 10000 fps. Specifically, in the embodiment, the light source 51 adopts a combination of LED light and Fresnel lens, the emitted light of the LED light source 51 is changed into parallel light irradiation, the diffuser 53 is arranged between the light source 51 and the observation area, and the diffuser 53 can make the incident light generated by the light source 51 to be scattered and distributed. The power of the LED light source 51 is 40 W; the magnification of the microscope lens of the high-speed camera 52 is 25 times; and the shooting frame rate of the high-speed camera 52 is 10000 fps.

[0029] With reference to Figure 4 and Figure 5 Further, the second monitoring module comprises a plurality of pressure sensors, a temperature sensor 61 and a flow meter, the plurality of pressure sensors are communicated with the main flow channel 12, and are used to collect the pressure parameters in the main flow channel 12; the temperature sensor 61 is arranged at the inlet pipe 3 and / or the outlet pipe 4, and is used to collect the temperature parameters; and the flow meter is arranged at the inlet pipe 3 and / or the outlet pipe 4, and is used to collect the flow parameters. Specifically, in the embodiment, a plurality of micro-holes 2231 are arranged on the first fixed block 223, the micro-holes 2231 are arranged perpendicularly to the axis of the inlet pipe 3, and the pressure sensors are arranged in the micro-holes 2231; the pressure adopts the average value of the parameters measured by the plurality of pressure sensors, the temperature is measured on line by the thermocouple, and the flow is measured by the vortex flow meter 62.

[0030] In some embodiments, the data acquisition and processing module adopts a dual-channel parallel processing architecture, including a first data processing channel and a second data processing channel, the first data processing channel is used for processing droplet images, sequentially performing image preprocessing, image segmentation and parameter extraction, and droplet parameter calculation and analysis; specifically, image preprocessing includes noise reduction, contrast enhancement and the like to improve image quality, image segmentation and parameter extraction is to automatically identify and outline the droplet shape profile through algorithm, and then calculate the size, projected area and the like of single droplet, droplet parameter calculation and analysis is based on the statistics of a large number of droplets to obtain the droplet size distribution, average diameter, number density and the like parameters of the whole field. The second data processing channel is used for processing process sensor signals, multi-channel data acquisition is performed through a multi-channel signal collector to convert analog signals into digital signals; then data grouping and buffering are performed, and identification is added to the data packet according to sensor type and time; finally, through gigabit network transmission technology, high-speed and stable data stream is sent to the integrated database module; wherein the first data processing channel and the second data processing channel run in parallel based on a unified time reference, and the output results are synchronously sent to the integrated database module, so as to facilitate subsequent construction of an accurate correlation model.

[0031] The application also provides an in-situ online monitoring system for a supersonic condensation phase change process, based on the above-mentioned in-situ online monitoring system for a supersonic condensation phase change process, comprising the following steps: The mixed gas containing condensable components is introduced into the supersonic condensation generating device 1, sequentially passes through the steady flow section 13 and the Laval nozzle 14, the steady flow section 13 uniformly distributes the mixed gas, and the Laval nozzle 14 increases the flow rate of the mixed gas and reduces the pressure and temperature, reaches supersonic speed in the expansion section 143, forms a low-temperature and low-pressure environment, so that the condensable components in the mixed gas spontaneously condense to generate droplets; The first monitoring module 5 is used to acquire droplet images in real time, and droplet parameters are extracted through an image processing algorithm, the image processing algorithm includes image preprocessing, image segmentation, feature recognition and parameter extraction steps, the extracted droplet parameters include droplet size distribution and number density, and the image is preprocessed to improve image clarity and recognizability, the image segmentation algorithm is used to automatically identify and statistically analyze the droplet features in the image, so as to deeply understand the droplet nucleation and growth law in the supersonic condensation phase change process, and the droplet size data are transmitted to the database; The second monitoring module is used for synchronously collecting process parameters of the mixed gas, including pressure parameters, flow parameters and temperature parameters. The temperature of the mixed gas is measured on-line by a thermocouple, the pressure sensor is communicated with the main flow channel 12 through the micro hole 2231 to realize the minimum interference collection of the gas parameters, and the flow measurement adopts a vortex flowmeter 62. The multi-channel synchronous data acquisition technology is used to collect the process parameters such as pressure, temperature and flow in real time, and the data is buffered in the local storage space of the multi-channel signal acquisition device, and then transmitted to the database through the gigabit Ethernet transmission; The data acquisition module of the integrated database is used to collect the droplet parameters and process parameter data in real time by using a unified time reference control, so as to ensure that the image frame corresponds to the process parameter one by one. The data storage module stores the data in real time and supports historical data traceability. The data structure includes a droplet parameter table and a process parameter table. The data reading module extracts data from the storage module according to the time index, processes the data by combining an analysis algorithm, constructs a correlation model between the droplet parameters and the process parameters such as pressure, temperature and flow, and presents the trend of multi-source data in a visual manner, so as to realize real-time and efficient monitoring of the supersonic condensation phase change process and improve the stability and condensation efficiency of the supersonic condensation phase change process.

[0032] An embodiment of the present application is used for studying the spontaneous condensation process of water vapor components in natural gas, and the implementation is as follows: The supersonic condensation occurrence device 1 has a rectangular cross section. The length L of the throat 142 is 1.5 times the width W of the throat 142. The power of the LED light source 51 is 40 W. The magnification of the microscope lens of the high-speed camera 52 is 25 times. The shooting frame rate of the high-speed camera 52 is 10000 fps. The pressure measuring point (micro hole 2231) is set to 15.

[0033] The natural gas is introduced into the supersonic condensation generating device 1, the wet natural gas enters from the inlet channel, passes through the steady flow section 13 and the Laval nozzle 14 in turn, the steady flow section 13 uniformly distributes the mixed gas, the Laval nozzle 14 increases the flow rate of the mixed gas, and the pressure and temperature are reduced, the supersonic speed is reached in the expansion section 143, and the low-temperature and low-pressure environment is formed, so that the water vapor component in the natural gas spontaneously condenses to generate liquid droplets. The droplet parameter in-situ monitoring module arranged at the Laval nozzle 14 is used, a backlight illumination mode is adopted, a high-speed camera 52 is used to observe the water droplet imaging in real time, water droplet size data is collected, and the image is preprocessed to improve the image definition and recognizability. The image segmentation algorithm is used for automatic identification and statistical analysis of the water droplet characteristics in the image, so as to deeply understand the nucleation and growth law of the water droplets in the supersonic condensation phase change process, and the water droplet size data is transmitted to the database. Through the process parameter monitoring module arranged in the supersonic condensation generating device 1, various measurement technologies are used to accurately measure the key parameters, the temperature of the natural gas is measured online by using a thermocouple, the pressure sensor is communicated with the main flow channel 12 through the micro hole 2231, the minimum interference collection of the gas parameters is realized, and the flow measurement adopts a vortex flowmeter 62. The multi-channel synchronous data acquisition technology is used to collect the process parameters such as pressure, temperature and flow in real time, and the data is buffered in the local storage space of the multi-channel signal collector, and then transmitted to the database through the gigabit Ethernet. Through the data acquisition module of the integrated database, the multi-channel data such as water droplet parameters and process parameters are acquired in real time; the data storage module stores the data in real time and supports the saving of historical data, the data storage structure includes a droplet parameter table, a process parameter table and the like; the data reading module extracts parameter data from the storage module according to the time index, processes the data by combining the analysis algorithm, constructs the correlation model between the droplet parameters and the process parameters such as pressure, temperature and flow, and intuitively and clearly presents the trend of multi-source data in a visual manner, realizes real-time and efficient monitoring of the supersonic condensation phase change process, and improves the stability and condensation efficiency of the supersonic condensation phase change process.

[0034] Another embodiment of the present application is directed to the spontaneous condensation process of the methane component in the hydrogen mixed natural gas, and the specific implementation is as follows: For the condensation characteristics of methane, the cross section of the supersonic condensation generating device 1 is a rectangular structure, the length L of the throat 142 is 2 times the width W of the throat 142, the power of the LED light source 51 is 60 W, the frame rate of the high-speed camera 52 is increased to 20000 fps, the magnification of the microscope lens is 30 times, and the pressure measuring point (micro hole 2231) is set to 20, so as to more accurately capture the pressure distribution.

[0035] The hydrogen-mixed natural gas is introduced into the supersonic condensation generating device 1, sequentially passes through the flow stabilizing section 13 and the Laval nozzle 14, the flow stabilizing section 13 uniformly distributes the mixed gas, the Laval nozzle 14 increases the flow rate of the mixed gas, and the pressure and temperature are reduced, the supersonic speed is reached in the expansion section 143, and the low-temperature and low-pressure environment is formed, so that the methane component in the hydrogen-mixed natural gas spontaneously condenses to generate liquid droplets. The liquid droplet parameter in-situ monitoring module arranged at the Laval nozzle 14 is used, a backlight illumination mode is adopted, a high-speed camera 52 is used to observe the imaging of the methane liquid droplets in real time, the liquid droplet size data is collected, and the image is pretreated to improve the image definition and recognizability. The image segmentation algorithm is used to automatically identify and statistically analyze the characteristics of the methane liquid droplets in the image, so as to deeply understand the nucleation and growth law of the methane liquid droplets in the supersonic condensation phase change process, and the methane liquid droplet size data is transmitted to the database. Through the process parameter monitoring module arranged at the supersonic condensation generating device 1, various measurement technologies are used to accurately measure the key parameters, the temperature of the hydrogen-mixed natural gas is measured online by using a thermocouple, a pressure sensor is communicated with the main flow channel 12 through a micro hole 2231, the gas parameter is collected with minimum interference, and a vortex flowmeter 62 is used for flow measurement. A multi-channel synchronous data acquisition technology is used to collect the process parameters such as pressure, temperature and flow in real time, and the data is buffered in the local storage space of the multi-channel signal acquisition device, and then transmitted to the database through gigabit Ethernet. Through the data acquisition module of the integrated database, the multi-channel data such as the methane liquid droplet parameters and the process parameters are acquired in real time; the data storage module stores the data in real time and supports the saving of historical data, the data storage structure includes a liquid droplet parameter table, a process parameter table and the like; the data reading module extracts the parameter data from the storage module according to the time index, processes the data by combining the analysis algorithm, constructs the correlation model between the methane liquid droplet parameters and the process parameters such as pressure, temperature and flow, and intuitively and clearly presents the trend of multi-source data in a visual manner, realizes real-time and efficient monitoring of the supersonic condensation phase change process.

[0036] The above are preferred embodiments of the present application, and do not limit the protection scope of the present application, therefore: any equivalent changes made on the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. An in-situ online monitoring system for a supersonic condensation phase transition process, characterized in that, include: The supersonic condensation generator (1) is used to accelerate a mixed gas containing condensable components to supersonic speed and cause a condensation phase change. The first monitoring module (5) is located at the ultrasonic condensation generator (1) and is used to acquire droplet images in real time. The second monitoring module is used to monitor the process parameters of the mixed gas in real time; The data acquisition and processing module includes an image recognition and data analysis unit and a multi-channel synchronous data acquisition unit; as well as Integrated database module; The data acquisition and processing module adopts a unified time base to control the first monitoring module (5) and the second monitoring module to perform synchronous data acquisition. The data acquisition and processing module stores the acquired droplet images and process parameters in association to the integrated database module to construct a correlation model between droplet images and process parameters.

2. The in-situ online monitoring system for a supersonic condensation phase transition process according to claim 1, characterized in that: The ultrasonic condensation generator (1) is connected to an inlet pipe (3) at one end and an outlet pipe (4) at the other end. The ultrasonic condensation generator (1) includes: The mounting bracket (2) has a main channel (12) connected to the inlet pipe (3) and the outlet pipe (4), the main channel (12) comprising: A flow stabilization section (13) is connected to the inlet pipe (3); The Laval nozzle (14) includes a contraction section (141), a throat (142), and an expansion section (143). The contraction section (141) is connected to the end of the flow stabilization section (13) away from the inlet pipe (3). The throat (142) is connected to the end of the contraction section (141) away from the flow stabilization section (13). The expansion section (143) is connected to the end of the throat (142) away from the contraction section (141). The end of the expansion section (143) away from the throat (142) is connected to the outlet pipe (4).

3. The in-situ online monitoring system for a supersonic condensation phase transition process according to claim 2, characterized in that: The mounting bracket (2) includes a first transparent plate (21), a central component (22), and a second transparent plate (23). The main channel (12) is opened in the central component (22). The first transparent plate (21) and the second transparent plate (23) are respectively arranged on both sides of the axial direction of the inlet pipe (3). The first transparent plate (21) and the second transparent plate (23) are detachably connected to the central component (22). The central component (22) includes a first enclosure plate (221), a second enclosure plate (222), a first fixing block (223), and a second fixing block (224). The first fixing block (223) and the second fixing block (224) are both stainless steel plates. The main channel (12) is assembled from the first enclosure plate (221), the second enclosure plate (222), the first fixing block (223), and the second fixing block (224). The first enclosure plate (221) and the second enclosure plate (222) are both transparent plates.

4. The in-situ online monitoring system for a supersonic condensation phase transition process according to claim 3, characterized in that: The mounting bracket (2) further includes a first mounting plate (24) and a second mounting plate (25). One side of the first mounting plate (24) is connected to the inlet pipe (3) and the other side is connected to the center member (22). One side of the second mounting plate (25) is connected to the outlet pipe (4) and the other side is connected to the side of the center member (22) away from the inlet pipe (3). Multiple connecting rods (26) are provided between the first mounting plate (24) and the second mounting plate (25). The first mounting plate (24) and the second mounting plate (25) are detachably connected by the connecting rods (26). A first through groove (241) is provided on the first mounting plate (24) to connect the inlet pipe (3) and the main channel (12). The shape of the first through groove (241) changes from circular to rectangular along the direction from the inlet pipe (3) to the center member (22).

5. The in-situ online monitoring system for a supersonic condensation phase transition process according to claim 2, characterized in that: The first monitoring module (5) includes: A light source (51) is positioned toward the expansion section (143), and the light source (51) is used to generate parallel backlight to illuminate the observation area within the expansion section (143); A camera (52) equipped with a microscope lens is positioned facing the observation area. The camera (52) and the light source (51) are respectively positioned on opposite sides of the axial direction of the inlet pipe (3). The camera (52) is positioned opposite to the light source (51). The camera (52) is used to capture droplet images at a frame rate greater than or equal to 10,000 fps. A diffuser (53) is positioned between the light source (51) and the observation area.

6. The in-situ online monitoring system for a supersonic condensation phase transition process according to claim 3, characterized in that: The process parameters include pressure parameters, temperature parameters, and flow rate parameters, and the second monitoring module includes: Multiple pressure sensors are connected to the main channel (12) to collect pressure parameters within the main channel (12); A temperature sensor (61), disposed at the inlet pipe (3) and / or the outlet pipe (4), is used to collect the temperature parameters; and A flow meter (62) is installed at the inlet pipe (3) and / or the outlet pipe (4) for collecting the flow parameters.

7. The in-situ online monitoring system for a supersonic condensation phase transition process according to claim 6, characterized in that: The first fixing block (223) has a plurality of microholes (2231) which are perpendicular to the axis of the inlet pipe (3) and the pressure sensor is disposed in the microholes (2231).

8. The in-situ online monitoring system for a supersonic condensation phase transition process according to claim 1, characterized in that: The data acquisition and processing module includes: The first data processing path is used to process droplet images, sequentially performing image preprocessing, image segmentation and parameter extraction, and droplet parameter calculation and analysis; The second data processing path is used to process process sensor signals, perform multi-channel data acquisition, data grouping and buffering, and transmit data via gigabit network. The first data processing path and the second data processing path operate in parallel based on a unified time reference, and their output results are synchronously sent to the integrated database module.

9. A method for in-situ online monitoring of a supersonic condensation phase transition process, characterized in that, The in-situ online monitoring system for the ultrasonic condensation phase transition process according to any one of claims 1-8 includes the following steps: The mixed gas is accelerated and condensed into droplets in the supersonic condensation generator (1); Using the first monitoring module (5), droplet images are acquired in real time, and droplet parameters are extracted through image processing algorithms; The process parameters of the mixed gas are collected synchronously using the second monitoring module; Using a unified time reference, the extracted droplet parameters are correlated with the collected process parameters and stored in an integrated database; as well as Based on the associated stored data, a correlation model between droplet parameters and process parameters is constructed and displayed through a visualization platform.

10. The method for in-situ online monitoring of a supersonic condensation phase transition process according to claim 9, characterized in that: The image processing algorithm includes image preprocessing, image segmentation, feature recognition, and parameter extraction steps. The extracted droplet parameters include droplet size distribution and number density. The process parameters include temperature parameters, pressure parameters, and flow rate parameters.

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