Multi-scene high-temperature adaptive multiphase flow local measurement system and method

Abstract

The invention relates to the technical field of chemical engineering measurement, and particularly discloses a multi-scene higher-temperature adaptive multiphase flow local measurement system and method, and the system comprises a constant-temperature reactor, a bubble generation device, a detachable higher-temperature adaptive telecentric optical probe, a jacket type constant-temperature liquid cooling heat dissipation device, and a data processing unit. The bubble generating device is used for introducing flow-controllable bubbles into the reactor to generate a gas phase environment; the constant-temperature reactor device can control the temperature of the reactor to form a target high-temperature environment; the detachable higher-temperature adaptive telecentric optical probe is used for acquiring local images in the constant-temperature reactor through the observation hole; the data processing unit can display the local measurement environment monitored by the optical probe in real time, control the acquisition frequency and the picture quality through the processor, and store the shot picture. According to the invention, the local dispersion characteristics of the multi-phase system can be measured in different temperature environments, and the online stable and accurate measurement of the local characteristics of the multi-phase flow in a high-temperature environment can be realized.

Description

Technical Field

[0001] This invention relates to the field of chemical engineering measurement technology, and in particular to a multi-scenario, high-temperature adaptable multiphase flow local measurement system and method. Background Technology

[0002] Multiphase flow reactors are widely used in chemical, petrochemical, and energy conversion industries. Their heat and mass transfer efficiency depends on local fluid dynamics characteristics such as size distribution and phase content distribution within the reactor. Therefore, measuring these local characteristics is a core prerequisite for optimizing reaction processes, controlling equipment safety, and regulating product quality. In actual production processes, high-temperature conditions are common, such as in coal chemical gasification furnaces, catalytic cracking reactors, and high-temperature molten salt heat exchange systems. Accurately capturing their local micro-dynamics is of irreplaceable value in breaking through the "black box" of high-temperature multiphase flow processes.

[0003] With the development of measurement technology, image methods, due to their intuitiveness and information-rich characteristics, are widely used for measuring local characteristics. They are mainly divided into two categories: non-invasive and invasive. While non-invasive methods avoid direct contact with the measured medium, they have low spatial resolution and can only be used for transparent systems, making it difficult to accurately capture the local microscopic characteristics of multiphase flows. Invasive image measurement methods, on the other hand, offer higher spatial resolution and flexibility, making them an ideal technical approach for measuring the local characteristics of multiphase flows, and have been widely used in ambient temperature and pressure multiphase flow scenarios. However, existing invasive image measurement methods suffer from problems such as high-temperature failure of optical lenses and sealing structures, insufficient heat dissipation and temperature control capabilities, and thermal deformation of mechanical structures when applied in high-temperature environments. Currently, they cannot be applied to such environmental conditions, necessitating the development of an invasive image measurement technology and method adaptable to high-temperature environments.

[0004] CN104344120A discloses a sealing method utilizing the solidification properties of high-temperature molten salt. Its core principle is to introduce a cooling system into the annular surface of the flange gap, causing the molten salt to gradually solidify during flow, forming an annular sealing ring. This technology achieves sealing through physical phase change, avoiding the aging problems of traditional sealing materials at high temperatures. It has a temperature resistance range of 50–1300℃ and is particularly suitable for multiphase flow systems containing molten salt (such as nuclear heat exchange systems and solar thermal storage devices).

[0005] CN114992326A discloses a mechanical seal structure and a mixed-phase pump for high-parameter mixed media, solving the problem that existing sealing structures cannot simultaneously achieve sealing of three-phase mixed media in high-parameter environments. It features a WC-Co hard alloy coating (hardness > 1200HV) on the moving ring surface and millimeter-level spiral dynamic pressure grooves on the stationary ring, forming a stable liquid film through hydrodynamic pressure effect, achieving zero leakage at 3000 r / min speed, 150℃ temperature, and 15MPa pressure. This invention's sealing structure has good wear resistance and can achieve sealing of single-phase, two-phase mixed, and three-phase mixed media, making it suitable for high-parameter environments and unknown media environments, with a wide range of applications.

[0006] CN116230819A discloses a superhydrophobic coating technology based on a unit cell strategy. This coating consists of diatomaceous earth microshells (rigid framework) and silica nanoseeds (releaseable functional components), simultaneously resisting the adhesion of liquid phases (such as crude oil and wastewater), gas phases (such as water vapor), solid phases (such as dust particles), and highly viscous phases (such as asphalt). It exhibits a contact angle >160° and a roll-off angle <5°. Through a self-healing mechanism that releases nanoseeds by breaking down the microshells, the coating maintains its superhydrophobicity after a Taber wear test (1kg load, 1000 cycles), demonstrating a 30-100 times improvement in wear resistance compared to traditional coatings. In a 300℃ thermal aging test, the coating adhesion retention rate is >90%, making it suitable for preventing coking on the inner walls of high-temperature multiphase flow equipment, such as catalytic cracking reactors and gasifiers.

[0007] Although existing research has developed sealing structures and adaptation methods with certain temperature resistance to meet the sealing requirements of high-temperature operating conditions, which can achieve short-term reliable sealing in specific high-temperature scenarios; at the same time, in the field of material surface modification, functional coating materials with different hydrophilic and hydrophobic properties have also been developed. However, these technological achievements have not yet formed an integrated solution that can adapt to complex multiphase flow systems, resulting in the technical need for measuring the local characteristics of high-temperature multiphase flow still not being met.

[0008] To address this, the present invention provides a multi-scenario high-temperature adaptable local measurement system and method for multiphase flow, so as to achieve stable invasive measurement of high-temperature multiphase flow systems. Summary of the Invention

[0009] The purpose of this invention is to provide a multi-scenario, high-temperature adaptable multiphase flow local measurement system and method to solve the problems existing in the prior art.

[0010] To achieve the above objectives, the present invention provides a multi-scenario, high-temperature adaptable multiphase flow local measurement system, comprising:

[0011] A thermostatic reactor is used to provide a multiphase flow environment with a constant temperature.

[0012] A bubble generating device is used to inject bubbles with a controllable flow rate into the constant-temperature reactor to generate a gas phase environment.

[0013] A detachable high-temperature adaptable telecentric optical probe is installed in the observation hole on the constant temperature reactor. The detachable high-temperature adaptable telecentric optical probe is used to acquire local images inside the constant temperature reactor through the observation hole.

[0014] A jacketed constant temperature liquid cooling heat dissipation device is installed on the detachable high temperature adaptable telecentric optical probe. The jacketed constant temperature liquid cooling heat dissipation device is used to control the temperature of the detachable high temperature adaptable telecentric optical probe.

[0015] The data processing unit includes a display and a processor. The display is used to display the local multiphase flow environment captured by the detachable high-temperature adaptable telecentric optical probe in real time. The processor is used to control the image acquisition frequency and image quality of the detachable high-temperature adaptable telecentric optical probe and to store the acquired images.

[0016] Preferably, the isothermal reactor comprises:

[0017] A constant temperature bath, which has a built-in flow control system and a temperature measurement system, is used to provide a constant temperature liquid;

[0018] An open-ended jacketed reactor, comprising an outer insulating jacket and an inner main reactor; the outer insulating jacket is provided with observation holes, and the constant temperature bath is connected to the inlet and outlet of the outer insulating jacket; the outer insulating jacket regulates the temperature of the inner main reactor by circulating a constant temperature liquid.

[0019] A stirring blade is disposed inside the inner layer of the main reactor and is used to provide a multiphase flow mixing environment for the inner layer of the main reactor.

[0020] A stirring motor is used to drive the stirring blades.

[0021] Preferably, the bubble generating device includes:

[0022] A gas distributor is disposed inside the inner main reactor and is used to constrain the size and distribution of bubbles entering the inner main reactor.

[0023] An air compressor is used to supply air at different flow rates to the gas distributor to provide a gaseous environment for the inner main reactor.

[0024] A gas flow meter is installed on the pipeline between the air compressor and the gas distributor. The gas flow meter is used to control the actual flow rate of gas injected into the inner main reactor.

[0025] Preferably, the detachable high-temperature adaptable telecentric optical probe includes:

[0026] Hydrophilic / hydrophobic interchangeable optical lenses;

[0027] The integrated pole body has a hollow structure, and the jacketed constant temperature liquid cooling heat dissipation device is sleeved and installed on the outside of the integrated pole body;

[0028] A telecentric optical module is installed at one end of the integrated rod body and is used to acquire local images inside the inner main reactor.

[0029] A detachable sealing end is installed on the outer insulation jacket and can be detachably installed on the other end of the integrated rod body. The detachable sealing end is used to achieve high-temperature sealing and isolation between the multiphase flow system under test and the telecentric optical module. An optical lens positioning groove is provided at one end of the detachable sealing end located inside the inner main reactor. The optical lens positioning groove adopts a stepped anti-detachment structure and is used to precisely limit the position of the hydrophilic and hydrophobic replaceable optical lens.

[0030] Preferably, the detachable sealing end includes a mating flange and a double-layer high-temperature resistant sealing assembly; the mating flange is made of corrosion-resistant and high-temperature resistant material, and the sealing surface of the mating flange is a concave-convex surface to ensure sealing accuracy at high temperatures; the double-layer high-temperature resistant sealing assembly includes a main sealing gasket and an auxiliary sealing gasket, and the double-layer high-temperature resistant sealing assembly is disposed between the mating flanges to form a reliable medium seal under high-temperature conditions.

[0031] Preferably, the hydrophilic / hydrophobic replaceable optical lens includes a quartz substrate lens, a hydrophilic / hydrophobic functional coating, and a standardized quick-release interface; the quartz substrate lens has a light transmittance of not less than 95%, a thickness of 3mm to 8mm, and rounded edges with a radius of 0.5mm to 1mm to avoid scratching the sealing components during assembly; the hydrophilic / hydrophobic functional coating is a superhydrophilic coating, a superhydrophobic coating, or an amphiphilic coating; the superhydrophilic coating has a water contact angle of not more than 10°, suitable for liquid-solid multiphase flow systems requiring rapid drainage, such as mixed systems containing high-viscosity liquids, to avoid liquid film residue; the superhydrophobic coating has a water contact angle of not less than 150° and a roll-off angle of not more than 5°, suitable for multiphase flow systems containing mist-like gas phases or easily adhered liquids, such as high-temperature oil-gas mixtures, to prevent droplet atomization and adhesion; the amphiphilic coating is used for dual repulsion of polar and non-polar media, suitable for gas-liquid-solid three-phase mixed systems.

[0032] Preferably, the integrated rod body serves as the structural support and optical path carrier for the probe, and is formed by integral precision machining; the integrated rod body is made of corrosion-resistant and high-temperature resistant material, the length tolerance of the integrated rod body is ±0.1mm, the straightness of the rod body is no greater than 0.05mm / m, and the coaxiality is no greater than 5μm, to ensure the optical path alignment accuracy with the telecentric optical module.

[0033] Preferably, the telecentric optical module includes a telecentric lens, a high-speed camera, and a light source control system; the image distortion of the telecentric lens is less than 0.2%, the high-speed camera is mounted on the integrated pole body through the telecentric lens, and the light source control system is an LED light group built into the connection between the detachable sealed end and the integrated pole body.

[0034] Preferably, the jacketed constant temperature liquid cooling heat dissipation device includes a jacketed flow channel, a cooling medium inlet and outlet, and a constant temperature control module. The jacketed flow channel is arranged around the integrated rod body, and the constant temperature control module is connected to the jacketed flow channel through the cooling medium inlet and outlet; thereby realizing dynamic adjustment of the cooling medium temperature and ensuring that the temperature of the integrated rod body is stably controlled below 40°C, avoiding thermal distortion of optical components caused by high temperature.

[0035] Preferably, the corrosion-resistant and high-temperature-resistant material is 316L stainless steel; the material of the double-layer high-temperature-resistant sealing assembly is a fluororubber / graphite composite high-temperature-resistant sealing gasket with a temperature range of -20℃ to 260℃ and a short-term peak temperature of 300℃; and the quartz substrate lens is made of high-transmittance fused silica.

[0036] A multi-scenario, high-temperature-adaptive local measurement method for multiphase flow, using the aforementioned multi-scenario, high-temperature-adaptive local measurement system for multiphase flow, specifically includes the following steps:

[0037] Depending on the system being measured, different hydrophilic and hydrophobic interchangeable optical lenses are selected. The detachable high-temperature adaptable telecentric optical probe is installed and pre-positioned at the observation hole on the constant temperature reactor.

[0038] A target measurement temperature environment is generated using a constant-temperature reactor;

[0039] If the dispersed phase includes a gas phase, a gas phase environment is generated in the isothermal reactor by a bubble generator; if the dispersed phase is a liquid phase or a solid phase, the corresponding dispersed phase is added to the isothermal reactor.

[0040] Turn on the stirring motor in the constant temperature reactor to create a turbulent environment, so that the dispersed phase can be effectively dispersed;

[0041] The flow conditions inside the constant temperature reactor are captured by a detachable high-temperature adaptable telecentric optical probe, and the image acquisition frequency and image quality are controlled by a processor.

[0042] Collect and store images taken by a detachable, high-temperature-adaptive telecentric optical probe.

[0043] Compared with the prior art, the present invention has the following advantages and technical effects:

[0044] The multi-scenario high-temperature adaptable multiphase flow local measurement system and method provided by the present invention can measure the local dispersion characteristics of multiphase systems under different temperature environments. Especially under high temperature (60-120℃) environments, the dispersed phase / continuous phase will undergo phase changes, making the interphase interaction more complex. The measurement device provided by the present invention is of great significance for revealing this process. Attached Figure Description

[0045] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0046] Figure 1 This is a schematic diagram of a multi-scenario high-temperature adaptable multiphase flow local measurement system provided in Embodiment 1 of the present invention;

[0047] Figure 2 This is a schematic diagram of the detachable high-temperature adaptable telecentric optical probe provided in Embodiment 1 of the present invention;

[0048] Figure 3 This is a partial schematic diagram of a high-temperature gas-liquid two-phase system according to Application Example 1 of the present invention;

[0049] Figure 4This is a partial schematic diagram of a high-temperature liquid-liquid two-phase system according to Comparative Application Example 1 of the present invention;

[0050] Figure 5 This is a partial schematic diagram of a high-temperature gas-liquid-solid three-phase system according to Application Example 2 of the present invention;

[0051] Figure 6 This is a partial schematic diagram of a high-temperature gas-liquid-liquid three-phase system according to Comparative Application Example 2 of the present invention;

[0052] In the diagram: 1. Air compressor; 2. Gas flow meter; 3. Gas distributor; 4. Perforated jacketed reactor; 5. Stirring motor; 6. Stirring blade; 7. Observation port; 8. Constant temperature bath; 9. Detachable high-temperature adaptable telecentric optical probe; 10. Telecentric optical module; 11. Processor; 12. Display; 13. High-speed camera; 14. Telecentric lens; 15. Jacketed constant temperature liquid cooling device; 16. Detachable sealed end; 17. Hydrophilic / hydrophobic replaceable optical lens; 18. Integrated rod body; 19. Constant temperature control module. Detailed Implementation

[0053] It should be noted that, unless otherwise specified, the embodiments and features described in this invention can be combined with each other. The described embodiments are merely some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this invention. The invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0054] It should be noted that the examples and comparative results presented in this invention are primarily intended to aid in understanding the invention. The gas-liquid-solid (air-water-particle) or gas-liquid-liquid (air-water-silicone oil) three-phase materials selected in the conclusions are commonly used materials in cold model testing, but in practical applications, they are not limited to these materials and systems, although the measurement methods remain the same. Furthermore, the terms "comprising" and "having" are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products, or apparatuses.

[0055] This invention provides a multi-scenario, high-temperature adaptable multiphase flow local measurement system, comprising:

[0056] A thermostatic reactor is used to provide a multiphase flow environment with a constant temperature.

[0057] A bubble generator is used to inject bubbles with a controllable flow rate into a constant-temperature reactor to create a gaseous environment.

[0058] A detachable high-temperature-adaptive telecentric optical probe 9 is installed in the observation hole 7 on the constant temperature reactor. The detachable high-temperature-adaptive telecentric optical probe 9 is used to acquire local images inside the constant temperature reactor through the observation hole 7.

[0059] A jacketed constant temperature liquid cooling heat dissipation device 15 is installed on a detachable high temperature adaptable telecentric optical probe 9. The jacketed constant temperature liquid cooling heat dissipation device 15 is used to control the temperature of the detachable high temperature adaptable telecentric optical probe 9.

[0060] The data processing unit includes a display 12 and a processor 11. The display 12 is used to display the local multiphase flow environment captured by the detachable high-temperature adaptable telecentric optical probe 9 in real time. The processor 11 is used to control the image acquisition frequency and image quality of the detachable high-temperature adaptable telecentric optical probe 9 and to store the acquired images.

[0061] Further optimization of the scheme, the isothermal reactor includes:

[0062] Thermostatic bath 8 has a built-in flow control system and temperature measurement system. Thermostatic bath 8 is used to provide thermostatic liquid.

[0063] The perforated jacketed reactor 4 includes an outer insulation jacket and an inner main reactor. The outer insulation jacket is provided with observation holes 7. The constant temperature bath 8 is connected to the inlet and outlet of the outer insulation jacket. The outer insulation jacket regulates the temperature of the inner main reactor by circulating the constant temperature liquid.

[0064] The stirring blade 6 is located inside the inner main reactor and is used to provide a multiphase flow mixing environment for the inner main reactor.

[0065] Stirring motor 5 is used to drive stirring blade 6.

[0066] Further optimization of the scheme includes the following bubble generating device:

[0067] Gas distributor 3 is located inside the inner main reactor and is used to constrain the size and distribution of bubbles entering the inner main reactor.

[0068] Air compressor 1 is used to supply air at different flow rates to gas distributor 3, providing a gaseous environment for the inner main reactor;

[0069] Gas flow meter 2 is installed on the pipeline between air compressor 1 and gas distributor 3. Gas flow meter 2 is used to control the actual flow rate of gas injected into the inner main reactor.

[0070] Further optimization of the design includes the following: A detachable, high-temperature-adaptive telecentric optical probe 9.

[0071] 17. Hydrophilic / hydrophobic replaceable optical lenses;

[0072] The integrated pole body 18 has a hollow structure, and the jacketed constant temperature liquid cooling heat dissipation device 15 is installed on the outside of the integrated pole body 18.

[0073] Telecentric optical module 10 is installed at one end of the integrated rod body 18. The telecentric optical module 10 is used to acquire local images inside the inner main reactor.

[0074] The detachable sealing end 16 is installed on the outer insulation jacket and can be detachably installed on the other end of the integrated rod body 18. The detachable sealing end 16 is used to achieve high-temperature sealing isolation between the multiphase flow system under test and the telecentric optical module 10. An optical lens positioning groove is provided at one end of the detachable sealing end 16 located inside the inner main reactor. The optical lens positioning groove adopts a stepped anti-detachment structure and is used to accurately limit the position of the hydrophilic and hydrophobic replaceable optical lens 17.

[0075] Further optimization of the design: the detachable sealing end 16 includes a mating flange and a double-layer temperature-resistant sealing assembly; the mating flange is made of corrosion-resistant and high-temperature-resistant material and the sealing surface of the mating flange is a raised surface; the double-layer temperature-resistant sealing assembly includes a main sealing gasket and an auxiliary sealing gasket, and the double-layer temperature-resistant sealing assembly is set between the mating flanges.

[0076] Further optimization of the design: the hydrophilic / hydrophobic replaceable optical lens 17 includes a quartz base lens, a hydrophilic / hydrophobic functional coating, and a standardized quick-release interface; the light transmittance of the quartz base lens is not less than 95%, and the thickness of the quartz base lens is 3mm to 8mm; the hydrophilic / hydrophobic functional coating is a superhydrophilic coating, a superhydrophobic coating, or an amphiphilic coating; the water contact angle of the superhydrophilic coating is not greater than 10°, the water contact angle of the superhydrophobic coating is not less than 150°, the roll-off angle of the superhydrophobic coating is not greater than 5°, and the amphiphilic coating is used for dual repulsion of polar and non-polar media.

[0077] Further optimization of the design: the integrated shaft 18 is made of corrosion-resistant and high-temperature resistant material, the length tolerance of the integrated shaft 18 is ±0.1mm, the straightness of the shaft is no more than 0.05mm / m, and the coaxiality is no more than 5μm.

[0078] Further optimization of the scheme: the telecentric optical module 10 includes a telecentric lens 14, a high-speed camera 13, and a light source control system; the image distortion of the telecentric lens 14 is less than 0.2%, the high-speed camera 13 is mounted on the integrated pole body 18 through the telecentric lens 14, and the light source control system is an LED light group built into the connection between the detachable sealed end 16 and the integrated pole body 18.

[0079] The scheme is further optimized. The jacketed constant temperature liquid cooling heat dissipation device 15 includes a jacketed flow channel, a cooling medium inlet and outlet, and a constant temperature control module 19. The jacketed flow channel is arranged around the integrated rod body 18, and the constant temperature control module 19 is connected to the jacketed flow channel through the cooling medium inlet and outlet.

[0080] Further optimization of the design: the corrosion-resistant and high-temperature-resistant material is 316L stainless steel; the double-layer high-temperature-resistant sealing component is made of fluororubber / graphite composite high-temperature-resistant sealing gasket with a temperature range of -20℃ to 260℃ and a short-term peak temperature of 300℃; the quartz base lens is made of high-transmittance fused silica material.

[0081] A multi-scenario, high-temperature-adaptive local measurement method for multiphase flow, using the aforementioned multi-scenario, high-temperature-adaptive local measurement system for multiphase flow, specifically includes the following steps:

[0082] Select different hydrophilic and hydrophobic replaceable optical lenses 17 according to the measurement system. After the detachable high-temperature adaptable telecentric optical probe 9 is installed, it is placed in advance at the observation hole 7 on the constant temperature reactor.

[0083] A target measurement temperature environment is generated using a constant-temperature reactor;

[0084] If the dispersed phase includes a gas phase, a gas phase environment is generated in the isothermal reactor by a bubble generator; if the dispersed phase is a liquid phase or a solid phase, the corresponding dispersed phase is added to the isothermal reactor.

[0085] Turn on the stirring motor 5 in the constant temperature reactor to create a turbulent environment so that the dispersed phase can be effectively dispersed;

[0086] The flow conditions inside the constant temperature reactor are captured by a detachable high-temperature adaptable telecentric optical probe 9, and the image acquisition frequency and image quality are controlled by the processor 11.

[0087] Collect and store images captured by the detachable high-temperature adaptable telecentric optical probe 9.

[0088] Example 1

[0089] Figure 1 This embodiment provides a schematic diagram of a multi-scenario, high-temperature adaptable, multiphase flow local measurement system. The measurement system includes a bubble generator, a constant-temperature reactor, a detachable, high-temperature adaptable telecentric optical probe 9, and a data processing unit, wherein:

[0090] A bubble generator is used to introduce bubbles with a controllable flow rate into the reactor to create a gaseous environment.

[0091] A constant-temperature reactor can control the temperature of the reactor to create a high-temperature environment for target measurement.

[0092] The detachable high-temperature adaptable telecentric optical probe 9 can capture local characteristics inside the reactor in a high-temperature environment. It can select hydrophilic or hydrophobic interchangeable optical lenses according to the reaction medium to complete the imaging task.

[0093] The data processing unit can control the image acquisition frequency and image quality, and can save the photos captured by the probe.

[0094] In this embodiment of the invention, the isothermal reactor is connected to the isothermal bath 8 via an outer insulation jacket to insulate the inner main reactor and provide a target measurement temperature environment. The isothermal reactor refers to a chemical reaction device capable of maintaining a certain temperature and providing a turbulent (dispersion) environment; the continuous phase refers to the medium in the isothermal reactor that continuously and uniformly fills the entire reactor space; the target detection environment refers to the measurement environment created in the isothermal reactor due to the different physical properties of the continuous and dispersed phases and the different set temperatures of the reactor; the bubble generator is used to create a gaseous dispersed phase environment in the continuous phase, and can initially control the distribution of the gas phase in the reactor according to different aeration rates and the structure of the gas distributor 3; the detachable high-temperature adaptable telecentric optical probe 9 is used to photograph the dispersion state of the local dispersed phase under high-temperature conditions, and its structure is as follows. Figure 2 As shown, it includes a detachable sealed end 16, a jacketed constant temperature liquid cooling heat dissipation device 15, an integrated rod body 18, a hydrophilic and hydrophobic replaceable optical lens 17, and a telecentric optical module 10; the data processing unit can control the image acquisition frequency and image quality, and save the photos taken by the probe.

[0095] Optionally, the constant temperature reactor includes an open-jacket reactor 4, a stirring motor 5, stirring blades 6, and a constant temperature bath 8. The open-jacket reactor 4 includes an outer insulation jacket, an inner reactor body, and an observation hole 7. The inlet and outlet of the outer insulation jacket are connected to the constant temperature bath 8 to provide the target measurement temperature environment for the inner reactor body. The observation hole 7 is used to place an optical probe to achieve invasive measurement. The stirring motor 5 provides power to the stirring blades 6 and can control the rotation speed of the stirring blades 6. The stirring blades 6 provide a turbulent environment for the inner reactor body. The constant temperature bath 8 provides a circulating liquid at a preset temperature for the inner reactor body.

[0096] For example, such as Figure 1As shown, the constant temperature reactor may include an open-jacket reactor 4, a stirring motor 5, stirring blades 6, and an observation hole 7; the inner diameter of the open-jacket reactor 4 may be 190 mm, the outer diameter may be 210 mm, and the jacket width may be 10 mm; the stirring blades 6 may be six-bladed upward-sloping blades with a blade diameter of 63 mm, a blade height of 48 mm, a width of 38 mm, and a thickness of 2 mm; the observation hole 7 may have an inner diameter of 25 mm; the constant temperature bath 8, model DC-3015, has a temperature control range of -5℃ to 100℃ and a temperature control accuracy of ±0.5℃.

[0097] For example, the bubble generating device includes an air compressor 1, a gas flow meter 2, and a gas distributor 3. The air compressor 1 can be a silent oil-free air compressor with a power of 550-9000W and a gas flow rate of 110-600L / min. The gas flow meter 2 can be an MF5712 (range 0-20L / min) miniature gas mass flow meter. The gas distributor 3 can have an outer diameter of 52mm and an inner diameter of 48mm, with 30 small holes of 1mm in diameter evenly distributed at the bottom of the distributor.

[0098] Specifically, a detachable, high-temperature-adaptive telecentric optical probe, such as... Figure 2As shown, the device includes a high-speed camera 13, a telecentric lens 14, a jacketed constant-temperature liquid cooling device 15, a detachable sealing end 16, a hydrophilic / hydrophobic replaceable optical lens 17, and an integrated rod body 18. The high-speed camera 13 has a sufficiently high acquisition frequency to capture the dynamic process of a reaction instant. The telecentric lens 14 can ignore the influence of image distortion during shooting, with a lens image distortion rate of <0.2%. The jacketed constant-temperature liquid cooling device 15 surrounds the integrated rod body 18 and is used to control the temperature of the rod body and internal components. It includes a jacketed flow channel, a cooling medium inlet and outlet, and a constant-temperature control module 19. The inner wall of the jacketed flow channel is polished to reduce the flow resistance of the cooling medium. The detachable sealing end 16 is used to achieve high-temperature sealing isolation between the probe and the multiphase flow system being measured. It includes a mating flange, a double-layer high-temperature resistant sealing assembly, and an optical lens positioning groove. The mating flange is made of corrosion-resistant and high-temperature resistant material, and the flange sealing surface is designed as a raised / concave surface to ensure sealing accuracy at high temperatures. The double-layer high-temperature resistant sealing assembly is embedded in the two flanges. Within the sealing surface gap of the disc, including the main sealing gasket and the auxiliary sealing gasket, a double-sealing redundancy design is used to avoid sealing failure caused by alternating gas-liquid impact and solid particle embedding in multiphase flow. The optical lens positioning groove is located in the center area of ​​the sealing end, employing a stepped anti-detachment structure. The groove's coaxiality is ≤5μm and its depth tolerance is ±0.02mm. This groove is used for precise positioning of the hydrophilic / hydrophobic replaceable optical lens 17. Simultaneously, a flexible dustproof rubber ring is built into the groove opening to prevent external media dust or droplets from intruding into the lens surface. The hydrophilic / hydrophobic replaceable... The optical lens 17 is the core optical component of the probe, used to adapt to the anti-adhesion requirements of different multiphase flow media. It includes a quartz substrate lens, hydrophilic and hydrophobic functional coating, and a standardized quick-release interface. The integrated rod body 18 serves as the structural support and optical path carrier of the probe, and is precision machined as a whole. The length of the rod body can be customized according to the working distance of the camera, with a length tolerance of ±0.1mm, a straightness of ≤0.05mm / m, and a coaxiality of ≤5μm, to ensure the optical path alignment accuracy with the telecentric optical module 10.

[0099] For example, the high-speed camera 13 can be a PhantomVEO710L with a frame rate of up to 2000fps; the sealing end and integrated rod body 18 are made of corrosion-resistant and high-temperature resistant 316L stainless steel; the sealing ring is made of fluororubber / graphite composite high-temperature resistant sealing gasket with a temperature range of -20℃ to 260℃ and a short-term peak temperature resistance of up to 300℃; the hydrophilic and hydrophobic replaceable optical lens 17 is made of high-transmittance fused silica material (transmittance ≥95%, 400~800nm ​​visible light band), the lens thickness is set to 10mm, and the edges are rounded (rounded corner radius 0.5~1mm) to avoid scratching the sealing components during assembly;

[0100] Optionally, the data processing unit includes a processor 11 and a display 12; wherein, the display 12 is used to display in real time the local multiphase flow environment in the isothermal reactor captured by the optical probe; the processor 11 is mainly used to control the image acquisition frequency and image quality, and to save the photos taken by the probe.

[0101] For example, the image acquisition frequency and image quality are controlled by the camera frame rate, exposure time, and exposure intensity; the camera exposure time refers to the duration for which the camera sensor receives light and records signals, usually set to 150μs; the shooting frame rate refers to the number of times the image acquisition device captures a local image per unit time, usually expressed as the number of image frames captured per second (FramesPerSecond, fps), with a preset frame rate of 2000fps; the exposure intensity is controlled by the LED light group built into the connection between the detachable sealed end 16 and the integrated rod body 18.

[0102] It should be noted that the gas phase can be air, inert gas, etc., the liquid phase can be tap water, silicone oil, n-hexane, etc., and the solid phase can be silica, PMMA particles, etc.; the gas phase aeration rate can be 5-15 L / min, for example, 5 L / min, 10 L / min, 15 L / min; the solid phase concentration can be 1-5 wt.%, for example, 1 wt.%, 3 wt.%, 5 wt.%; the liquid phase concentration can be 1-10 vol%, for example, 1 vol%, 3 vol%, 5 vol%, 8 vol%, 10 vol; the stirring speed can be 200-500 rpm, for example, 200 rpm, 300 rpm, 400 rpm, 500 rpm; if the stirring speed is too low, it will be difficult to suspend the solid phase and disperse the bubbles; if the stirring speed is too high, a higher frame rate is required.

[0103] The measurement methods mainly include the construction of a high-temperature environment, the generation and flow field stabilization of the dispersed phase, and image acquisition and data storage. The construction of the high-temperature environment mainly involves connecting the constant temperature bath 8 to the inlet and outlet of the outer insulation jacket of the open-type jacketed reactor 4, and achieving constant temperature control through the temperature of the constant temperature bath 8. The generation and flow field stabilization of the dispersed phase are achieved by using a bubble generator if the dispersed phase is gaseous, and by directly adding it to the reactor if the dispersed phase is liquid or solid. The mixing of the dispersed phase is achieved by the stirring motor 5 driving the stirring blades 6. Image acquisition and data storage are achieved through a detachable high-temperature adaptable telecentric optical probe 9, a processor 11, and a display 12. The hydrophilic / hydrophobic replaceable optical lens 17 can be replaced according to the experimental system. If there is an oil phase in the dispersed / continuous phase, a hydrophobic coated lens is used; otherwise, an uncoated lens is used.

[0104] For example, the high-temperature environment setup can be achieved by connecting the constant temperature bath 8 to the outer insulation jacket via a circulation pipeline. The constant temperature bath 8 is started and run for 3 minutes to check for leaks in the pipeline before stopping. The detachable high-temperature adaptable telecentric optical probe 9 is placed at the predetermined measurement point through the observation hole 7. The predetermined measurement point can be placed at different radial positions according to the length of the integrated rod 18, and the axial position is determined by the opening position. The jacketed constant temperature liquid cooling heat dissipation device 15 is started, the cooling water flow rate is adjusted to 5L / min, and the probe rod temperature is monitored to be ≤40℃. After the detachable high-temperature adaptable telecentric optical probe 9 is placed, the constant temperature bath 8 is started again, the target temperature is set, and the heating rate is controlled at 5℃ / min.

[0105] For example, the axial position of the observation hole 7 can be 80mm or 160mm from the bottom; the length of the rod can be 120mm; the target temperature can be -20℃ to 120℃, such as 25℃, 40℃, 60℃, 80℃, or 100℃.

[0106] For example, the generation of the dispersed phase and the stabilization of the flow field include the introduction of the dispersed phase and the start of the stirring motor 5. For the introduction of the dispersed phase, if it is a gas phase, start the air compressor 1, adjust the gas flow meter 2 to the target ventilation rate (which can be 5 L / min), observe the flow meter reading, and confirm that the gas phase generation is stable after the fluctuation is ≤ ±5% for 30 seconds. If it is a solid / liquid phase, add it to the reactor according to the predetermined dispersed phase concentration ratio (the liquid phase can be 1 vol.%, and the solid phase can be 1 wt.%). Once the flow field is stabilized, start the stirring motor 5, set the stirring speed to 300 rpm, and run for 5 minutes.

[0107] For example, in image acquisition and data storage, the environment monitored by the optical probe is observed through the display 12, and the exposure time is adjusted to ensure the quality of the acquired image, for example, the exposure time can be 150μs; the shooting frame rate is set according to the motion of the dispersed phase, for example, the shooting frame rate can be 2000fps; after the shooting is completed, the captured image is saved.

[0108] The following application examples are performed using the measurement system provided in the above embodiments.

[0109] Application Example 1

[0110] This application example provides a method for local measurement of multiphase flow under high-temperature gas-liquid two-phase conditions. The measurement method is performed using the measurement system provided in Example 1 and specifically includes the following steps:

[0111] (1) Connect the outer jacket of the constant temperature reactor to the constant temperature bath 8, and set the target temperature of the circulating liquid to 80℃; the optical probe is placed at the position to be measured through the measurement hole without a coated lens; start the liquid cooling heat dissipation device, adjust the cooling water flow rate and monitor the probe rod temperature ≤40℃;

[0112] (2) After the water temperature in the reactor is constant, start the bubble generator to generate gas phase, adjust the gas flow meter 2 to the ventilation rate of 5L / min, and wait for the flow fluctuation ≤±5% and continue for 30s to confirm stability.

[0113] (3) After the aeration is stable, start the stirring motor 5, set the stirring speed to 300 rpm, and run for 5 minutes to stabilize the flow field;

[0114] (4) Image acquisition is performed through the data processing unit. The exposure time is adjusted (e.g., 150 μs) to ensure image quality. The shooting frame rate is set according to the dispersed phase motion (e.g., 2000 fps). After acquisition, the images are saved. The captured images are as follows: Figure 3 As shown.

[0115] Application Example 2

[0116] This application example provides a local measurement method for multiphase flow under high-temperature liquid-liquid two-phase conditions. The measurement method is performed in the measurement system provided in Example 1 and specifically includes the following steps:

[0117] (1) Connect the outer jacket of the constant temperature reactor to the constant temperature bath 8, and set the target temperature of the circulating liquid to 80℃; the optical probe is made of a lens with a hydrophobic coating and is placed at the position to be measured through the measuring hole; start the liquid cooling heat dissipation device, adjust the cooling water flow rate and monitor the probe rod temperature ≤40℃;

[0118] (2) After the water temperature in the reactor is constant, add silicone oil to the reactor as the dispersed phase at a concentration of 1 vol.%;

[0119] (3) Start the stirring motor 5, set the stirring speed to 300 rpm, and run for 5 minutes to stabilize the flow field;

[0120] (4) Image acquisition is performed through the data processing unit. The shooting frame rate is set to 2000fps and the exposure time to 150μs to ensure image quality. After acquisition, the images are saved. The captured images are as follows: Figure 4 As shown.

[0121] Comparative Application Example 1

[0122] This application example provides a method for local measurement of multiphase flow in a gas-liquid-solid three-phase system under high-temperature conditions. The measurement method is performed using the measurement system provided in Example 1 and specifically includes the following steps:

[0123] (1) Connect the outer jacket of the constant temperature reactor to the constant temperature bath 8, and set the target temperature of the circulating liquid to 80℃; the optical probe is placed at the position to be measured through the measurement hole without a coated lens; start the liquid cooling heat dissipation device, adjust the cooling water flow rate and monitor the probe rod temperature ≤40℃;

[0124] (2) After the water temperature in the reactor is constant, add silica particles as solid phase to the reactor at a concentration of 1 wt.%; start the bubble generator to generate gas phase, adjust the gas flow meter 2 to the ventilation rate of 5 L / min, and wait for the flow fluctuation ≤ ±5% and continue for 30s to confirm stability.

[0125] (3) After the aeration is stable, start the stirring motor 5, set the stirring speed to 300 rpm, and run for 5 minutes to stabilize the flow field;

[0126] (4) Image acquisition is performed through the data processing unit. The exposure time is adjusted (e.g., 150 μs) to ensure image quality. The shooting frame rate is set according to the dispersed phase motion (e.g., 2000 fps). After acquisition, the images are saved. The captured images are as follows: Figure 5 As shown.

[0127] Comparative Application Example 2

[0128] This application example provides a method for local measurement of multiphase flow in a gas-liquid-liquid three-phase system under high-temperature conditions. The measurement method is performed using the measurement system provided in Example 1 and specifically includes the following steps:

[0129] (1) Connect the outer jacket of the constant temperature reactor to the constant temperature bath 8, and set the target temperature of the circulating liquid to 80℃; the optical probe is made of a lens with a hydrophobic coating and is placed at the position to be measured through the measuring hole; start the liquid cooling heat dissipation device, adjust the cooling water flow rate and monitor the probe rod temperature ≤40℃;

[0130] (2) After the water temperature in the reactor is constant, add silicone oil to the reactor as the dispersed phase at a concentration of 1 vol.%; start the bubble generator to generate the gas phase, adjust the gas flow meter 2 to the ventilation rate of 5 L / min, and wait until the flow fluctuation is ≤ ±5% and lasts for 30 seconds to confirm stability.

[0131] (3) After the aeration is stable, start the stirring motor 5, set the stirring speed to 300 rpm, and run for 5 minutes to stabilize the flow field;

[0132] (4) Image acquisition is performed through the data processing unit. The exposure time is adjusted (e.g., 150 μs) to ensure image quality. The shooting frame rate is set according to the dispersed phase motion (e.g., 2000 fps). After acquisition, the images are saved. The captured images are as follows: Figure 6 As shown.

[0133] Performance testing

[0134] The images obtained by applying Examples 1 and 2 and comparing them are as follows: Figure 3-6 As shown.

[0135] Figure 3The image shows a partial measurement of the gas-liquid two-phase system obtained in Example 1 under high temperature conditions. It can be seen that at higher temperatures (80℃), there are many small bubbles in the gas-liquid two-phase system. This may be due to the phase change of some water molecules, which produces water vapor.

[0136] Figure 4 To compare the local measurement results of the liquid-liquid two-phase system under high temperature obtained in Application Example 1, it can be found that using an optical lens with a hydrophobic coating can effectively prevent oil phase from contaminating the lens; in addition, even under conditions where no air is introduced, some small bubbles will be generated in the system, but the presence of the liquid phase will reduce the number of bubbles generated accordingly.

[0137] Figure 5 The local measurement images of the gas-liquid-solid three-phase system obtained in Example 2 under high temperature conditions show that the bubbles are more dispersed and have a higher sphericity after the addition of particles.

[0138] Figure 6 By comparing the local measurement images of the gas-liquid-liquid three-phase system obtained in Example 2 under high temperature conditions, it can be found that under the condition of liquid phase presence, the bubble shape is closer to spherical, and the shape and size distribution of the droplets are relatively uniform.

[0139] In summary, the present invention provides a multi-scenario, high-temperature adaptable multiphase flow local measurement system and method, which can measure the local dispersion characteristics of multiphase systems under different temperature environments. Especially under high-temperature environments, the dispersed phase / continuous phase undergoes phase changes, making the interphase interactions more complex. The measurement device provided by the present invention is of great significance for revealing this process.

[0140] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A multi-scenario, high-temperature adaptable multiphase flow local measurement system, characterized in that, include: A thermostatic reactor is used to provide a multiphase flow environment with a constant temperature. A bubble generating device is used to inject bubbles with a controllable flow rate into the constant-temperature reactor to generate a gas phase environment. A detachable high-temperature adaptable telecentric optical probe (9) is installed in the observation hole (7) on the constant temperature reactor. The detachable high-temperature adaptable telecentric optical probe (9) is used to acquire local images inside the constant temperature reactor through the observation hole (7). A jacketed constant temperature liquid cooling heat dissipation device (15) is installed on the detachable high temperature adaptable telecentric optical probe (9). The jacketed constant temperature liquid cooling heat dissipation device (15) is used to control the temperature of the detachable high temperature adaptable telecentric optical probe (9). The data processing unit includes a display (12) and a processor (11). The display (12) is used to display the local multiphase flow environment captured by the detachable high-temperature adaptable telecentric optical probe (9) in real time. The processor (11) is used to control the image acquisition frequency and image quality of the detachable high-temperature adaptable telecentric optical probe (9) and to store the acquired images.

2. The multi-scenario high-temperature adaptable multiphase flow local measurement system according to claim 1, characterized in that, The isothermal reactor includes: Thermostatic bath (8) is equipped with a flow control system and a temperature measurement system. The thermostatic bath (8) is used to provide thermostatic liquid. An open-ended jacketed reactor (4) includes an outer heat-insulating jacket and an inner main reactor. An observation hole (7) is provided on the outer heat-insulating jacket. The constant temperature bath (8) is connected to the inlet and outlet of the outer heat-insulating jacket. The outer heat-insulating jacket regulates the temperature of the inner main reactor by circulating a constant temperature liquid. A stirring blade (6) is disposed on the inner side of the inner main reactor, and the stirring blade (6) is used to provide a multiphase flow mixing environment for the inner main reactor; A stirring motor (5) is used to drive the stirring blades (6).

3. The multi-scenario high-temperature adaptable multiphase flow local measurement system according to claim 2, characterized in that, The bubble generating device includes: Gas distributor (3), the gas distributor (3) is disposed on the inner side of the inner main reactor, the gas distributor (3) is used to constrain the size and distribution of bubbles entering the inner main reactor; An air compressor (1) is used to supply air at different flow rates to the gas distributor (3) to provide a gaseous environment for the inner main reactor. A gas flow meter (2) is installed on the pipeline between the air compressor (1) and the gas distributor (3). The gas flow meter (2) is used to control the actual flow rate of the gas injected into the inner main reactor.

4. The multi-scenario high-temperature adaptable multiphase flow local measurement system according to claim 2, characterized in that, The detachable high-temperature adaptive telecentric optical probe (9) includes: Hydrophilic and hydrophobic interchangeable optical lenses (17); The integrated pole body (18) is a hollow structure, and the jacketed constant temperature liquid cooling heat dissipation device (15) is sleeved and installed on the outside of the integrated pole body (18). Telecentric optical module (10), which is installed at one end of the integrated rod body (18), is used to acquire local images inside the inner main reactor. A detachable sealing end (16) is installed on the outer insulation jacket and can be detachably installed on the other end of the integrated rod body (18). The detachable sealing end (16) is used to achieve high-temperature sealing isolation between the multiphase flow system under test and the telecentric optical module (10). An optical lens positioning groove is provided at one end of the detachable sealing end (16) located inside the inner main reactor. The optical lens positioning groove adopts a stepped anti-detachment structure and is used to precisely limit the position of the hydrophilic and hydrophobic replaceable optical lens (17).

5. The multi-scenario high-temperature adaptable multiphase flow local measurement system according to claim 4, characterized in that, The detachable sealing end (16) includes a mating flange and a double-layer temperature-resistant sealing assembly; the mating flange is made of corrosion-resistant and high-temperature-resistant material and the sealing surface of the mating flange is a concave-convex surface; the double-layer temperature-resistant sealing assembly includes a main sealing gasket and an auxiliary sealing gasket, and the double-layer temperature-resistant sealing assembly is disposed between the mating flanges.

6. The multi-scenario high-temperature adaptable multiphase flow local measurement system according to claim 4, characterized in that, The hydrophilic / hydrophobic replaceable optical lens (17) includes a quartz base lens, a hydrophilic / hydrophobic functional coating, and a standardized quick-release interface; the light transmittance of the quartz base lens is not less than 95%, and the thickness of the quartz base lens is 3mm to 8mm; the hydrophilic / hydrophobic functional coating is a superhydrophilic coating, a superhydrophobic coating, or an amphiphilic coating; the water contact angle of the superhydrophilic coating is not greater than 10°, the water contact angle of the superhydrophobic coating is not less than 150°, the roll-off angle of the superhydrophobic coating is not greater than 5°, and the amphiphilic coating is used for dual repulsion of polar and nonpolar media.

7. The multi-scenario high-temperature adaptable multiphase flow local measurement system according to claim 4, characterized in that, The integrated pole body (18) is made of corrosion-resistant and high-temperature resistant material. The length tolerance of the integrated pole body (18) is ±0.1mm, the straightness of the pole body is no greater than 0.05mm / m, and the coaxiality is no greater than 5μm.

8. The multi-scenario high-temperature adaptable multiphase flow local measurement system according to claim 4, characterized in that, The telecentric optical module (10) includes a telecentric lens (14), a high-speed camera (13), and a light source control system; the image distortion of the telecentric lens (14) is less than 0.2%, the high-speed camera (13) is mounted on the integrated pole body (18) through the telecentric lens (14), and the light source control system is an LED light group built into the connection between the detachable sealed end (16) and the integrated pole body (18).

9. The multi-scenario high-temperature adaptable multiphase flow local measurement system according to claim 4, characterized in that, The jacketed constant temperature liquid cooling heat dissipation device (15) includes a jacketed flow channel, a cooling medium inlet and outlet and a constant temperature control module (19). The jacketed flow channel is arranged around the integrated rod body (18), and the constant temperature control module (19) is connected to the jacketed flow channel through the cooling medium inlet and outlet.

10. A multi-scenario, high-temperature adaptable local measurement method for multiphase flow, characterized in that, The multi-scenario high-temperature adaptable multiphase flow local measurement system according to any one of claims 1-9 specifically includes the following steps: Select different hydrophilic and hydrophobic interchangeable optical lenses (17) according to the measurement system. After the detachable high-temperature adaptable telecentric optical probe (9) is installed, it is placed in advance at the observation hole (7) on the constant temperature reactor. A target measurement temperature environment is generated using a constant-temperature reactor; If the dispersed phase includes a gas phase, a gas phase environment is generated in the isothermal reactor by a bubble generator; if the dispersed phase is a liquid phase or a solid phase, the corresponding dispersed phase is added to the isothermal reactor. Turn on the stirring motor (5) in the constant temperature reactor to create a turbulent environment so that the dispersed phase can be effectively dispersed; The flow conditions inside the constant temperature reactor are captured by a detachable high-temperature adaptable telecentric optical probe (9), and the image acquisition frequency and image quality are controlled by a processor (11). Collect and store images taken by a detachable high-temperature adaptable telecentric optical probe (9).

Images