Gas-solid multiphase flow cold-state simulation characterization device and method

Abstract

The application discloses a gas-solid multiphase flow cold-state simulation characterization device and method, and relates to the field of gas-solid multiphase flow cold-state simulation characterization devices and methods.The device comprises a gas supply system, a multiphase flow cold-state simulation device, a characterization data acquisition and analysis system and a fluidization gas system.The multiphase flow cold-state simulation device is composed of a fast particle spouting zone, a high-efficiency particle mixing zone, a sufficient fluidization zone, a primary particle sedimentation and collection zone, a particle settler and a detachable horizontal conveying pipe, and can realize cold-state simulation characterization research on different fluidization media.The application also provides a gas-solid multiphase flow cold-state simulation characterization method based on a particle concentration monitor, a bed layer micro-pressure difference monitor and a characterization data acquisition and analysis system, which can automatically and numerically monitor and analyze the motion distribution, concentration distribution, velocity distribution and particle behavior of the bed layer fluidization medium.The application has high automation degree, efficient and convenient data analysis, and has wide application prospects in the field of gas-solid multiphase flow cold-state simulation.

Description

Technical Field

[0001] This invention belongs to the field of energy and chemical technology, and specifically relates to a gas-solid multiphase flow cold-state simulation characterization device and method. Background Technology

[0002] Under the influence of fluidized gas, solid particles exhibit complex motion phenomena resembling fluid states, influenced by the density, size, surface characteristics, packing properties, and fluidization operating conditions of the fluidized particles. It is particularly important to note the significant non-uniformity in gas-solid multiphase flow. Macroscopically, this manifests as uneven distribution of particle concentration and velocity along the axial direction; microscopically, it manifests as particle aggregation and dispersion. Studying these macroscopic and microscopic non-uniform flow characteristics is a challenging and decisive factor in the study of particle motion behavior in gas-solid multiphase flow. Ideal gas-solid multiphase flow exhibits certain regularities, but in actual research, due to velocity disturbances at the flow cross-section, violent impacts and entrainment effects of bubbles upon contact, and the "ring-core" characteristics of the bed, gas-solid multiphase flow beds frequently experience backmixing, channeling, surging, and throttling. Therefore, conducting gas-solid multiphase flow research based on a cold-state simulation device is of great significance, offering advantages such as intuitiveness, flexible conditions, lower investment, and versatility of the fluidizing medium.

[0003] The existing publicly available technologies, gas-solid multiphase flow cold simulation characterization devices and methods, mainly have the following problems: First, most existing technologies rely on visual observation and cannot achieve numerical data acquisition and analysis. Most publicly available technologies only disclose a cold-state simulation device, which lacks the relevant equipment and data acquisition and analysis system for numerical characterization of bed fluidization. Therefore, the experimental and simulation results obtained are only qualitative conclusions and it is difficult to form quantitative research results.

[0004] Second, the lack of gas-solid two-phase flow characterization methods makes it impossible to meet the special bed monitoring requirements of cold model devices. Cold model devices are mainly used for small-scale simulation and characterization of fluidized beds. The bed volume is often smaller than that of industrial devices, which also determines that the characteristic parameters of the bed, such as pressure difference, density, porosity, circulation volume and particle velocity, are small and change rapidly. Existing publicly available technologies are difficult to monitor and analyze the above-mentioned characterization data.

[0005] Third, there is a lack of real-time monitoring systems and methods for gas-solid two-phase flow. The operating characteristic parameters of cold-model gas-solid two-phase flow change extremely rapidly, and existing publicly available technologies struggle to achieve the technical effect of combining real-time bed data with analysis.

[0006] Fourth, cold simulation devices for gas-solid multiphase flow have limited functionality and are difficult to modify. Existing publicly available cold simulation devices have relatively simple designs and fixed structures. When changing the bed structure parameters, it is often necessary to disassemble and process the entire cold simulation device. The modification cost and difficulty are both high, making it difficult to meet the current practical needs of the gas-solid multiphase flow research field. Summary of the Invention

[0007] In order to overcome the shortcomings of the prior art, the present invention aims to provide a gas-solid multiphase flow cold simulation characterization device and method, in order to solve at least one of the following problems in the field of gas-solid multiphase flow cold simulation characterization: difficulty in numerical acquisition and analysis of bed characterization data, inability to adapt to the small range and high frequency data acquisition requirements of cold simulation device, limited prediction systems and methods for gas-solid two-phase flow, and difficulty in modifying cold simulation device.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A gas-solid multiphase flow cold state simulation and characterization device includes a gas supply system, a multiphase flow cold state simulation device, a characterization data acquisition and analysis system, and a fluidizing gas system, wherein the fluidizing gas system loosens and fluidizes the entire multiphase flow cold state simulation device. The multiphase flow cold state simulation device includes a particle rapid jetting zone, a particle high-efficiency mixing zone, and a fully fluidized zone connected sequentially from bottom to top according to the direction of incoming gas. A bottom discharge valve for the particle rapid jetting zone is also connected below the particle rapid jetting zone. The mainstream gas of the multiphase flow cold state simulation device is introduced from the particle rapid jetting zone through pipeline L. The fully fluidized zone is connected to the primary particle settling and collection zone via a detachable horizontal conveying pipe section I. The primary particle settling and collection zone is connected to the gas-solid dust collector via a detachable horizontal conveying pipe section II at its top. The gas-solid dust collector is connected to the particle settling device. The bottom of the high-efficiency particle mixing zone is connected to the lower end of the particle return system via a return pipe II, and the bottom of the particle settling device is connected to the lower end of the particle return system via a return pipe I. The high-efficiency particle mixing zone is equipped with a particle concentration monitor; the high-efficiency particle mixing zone, the fully fluidized zone, the primary particle settling and collection zone, the detachable horizontal conveying pipe section I, the detachable horizontal conveying pipe section II, and the particle setter are all connected to bed micro-pressure differential monitors via micro-particle filter interlocking devices; the signals from the particle concentration monitor and the bed micro-pressure differential monitor are all uploaded to the characterization data acquisition and analysis system.

[0009] The angle γ between the return pipe I and the particle settler is 0~160°, and the angle β between the return pipe II and the high-efficiency particle mixing zone is 0~160°.

[0010] The height of the rapid particle jetting zone is P, and the diameter is Q = 0.01P~0.95P; the air inlet of the rapid particle jetting zone connected to pipeline L is located on the lower side, the length of the air inlet is B, and the diameter is A = 0.01B~0.95B; the distance between the lower edge of the air inlet and the bottom of the rapid particle jetting zone is C = 0.01P~0.95P. The columnar portion of the high-efficiency particle mixing zone has a height of h, a diameter D of 0.01h to 0.95h, and a bottom angle α of 0 to 180°. The height of the cylindrical portion of the fully fluidized zone is M, the diameter is E = 0.01M~0.95M, and the bottom included angle θ = 0~180°; a feed port is provided on the fully fluidized zone, the diameter of the feed port is d = 0.01E~0.95E, and the distance between the lower edge of the feed port and the bottom of the fully fluidized zone is L = 0.01M~0.95M; the feed port is used to add the fluidizing medium of the multiphase flow cold state simulation device.

[0011] The particle concentration monitors are divided into K groups according to the vertical spacing t = 0.11h to 0.95h, and are evenly distributed in a ring radially to the upper, middle or lower part of the high-efficiency particle mixing zone; where h is the height of the columnar part of the high-efficiency particle mixing zone. In the high-efficiency mixing zone and the fully fluidized zone, the bed micro-pressure differential monitors are divided into N groups according to the vertical spacing Y = 0.01(M+h)~0.95(M+h), and are connected in a ring-shaped radial distribution to the upper, middle or lower parts of the high-efficiency mixing zone and the fully fluidized zone; where M is the height of the cylindrical part of the fully fluidized zone; In the particle setter, the bed micro-pressure differential monitors are divided into S groups according to the vertical spacing Z=0.01(M+h)~0.95(M+h), and are evenly distributed in a ring radially connected to the middle or lower part of the particle setter. In the primary particle settling and collection zone, the bed micro-pressure differential monitors are divided into T groups according to the vertical spacing g=0.01J~0.95J, and are evenly distributed in a ring radially in the middle or lower part of the primary particle settling and collection zone; where J is the height of the primary particle settling and collection zone. In detachable horizontal conveying pipe section I and detachable horizontal conveying pipe section II, bed micro-differential pressure monitors are divided into R groups according to the spacing U=0.01(M+h+J)~0.95(M+h+J), and are evenly distributed and connected to detachable horizontal conveying pipe section I and detachable horizontal conveying pipe section II.

[0012] In the high-efficiency particle mixing zone, the fluidizing gas system is divided into F-group branches, which are connected to the upper, middle or lower part of the high-efficiency particle mixing zone in a radially uniform manner through the end speed-increasing control device. In the primary particle settling collection zone, the fluidizing gas system is divided into Group I branches, which are connected in a radially uniform manner to the upper, middle or lower part of the primary particle settling collection zone through the terminal speed-increasing control device. In the pellet return system, the fluidizing gas system is divided into G group branches, which are connected to the upper, middle or lower part of the pellet return system in a radially evenly distributed manner through the end speed increase control device. In the particle setter, the fluidizing gas system is divided into H groups of branches, which are connected to the upper, middle or lower part of the particle setter in a radially uniform manner through the end speed-increasing control device.

[0013] The bottom of the primary particle settling and collection area is connected to W at an included angle μ=0~180°; W is one or more of the following: particle setter, particle return system, primary particle settling and collection area, detachable horizontal conveying pipe section I, detachable horizontal conveying pipe section II, return pipe I and return pipe II.

[0014] The gas supply system includes a fluidizing gas source, a precision pressure control valve, a fluidizing medium buffer tank, and a dehumidification and preheating system connected in sequence. Flow control valves are installed between the precision pressure control valve and the fluidizing medium buffer tank, and between the fluidizing medium buffer tank and the dehumidification and preheating system. The subsequent pipelines of the dehumidification and preheating system are divided into two lines, M and L: line M is connected to the fluidizing gas system via a flow control valve, a pressure precision monitor, and a total flow control valve; line L is connected to the particle rapid ejection zone via a flow control valve, a pressure precision monitor, and a total flow control valve.

[0015] The fluidizing medium is one or more of the following: coal, coke dust, oil shale, petroleum coke, dried sludge, quartz sand, catalyst, plastic, catalyst carrier, plant fruits, waste, and biomass particles; the gas source includes one or more of the following: nitrogen, oxygen, steam, syngas, carbon monoxide, hydrogen, methane, air, carbon dioxide, flue gas, helium, and argon; the dehumidification and preheating system includes one or more combinations of dehumidification and heating functions; the dehumidification method of the dehumidification and preheating system includes one or more combinations of cryogenic freezing, lithium bromide liquid adsorption, honeycomb adsorption, compressor, silica gel particle adsorption, and porous material adsorption; the heating method of the dehumidification and preheating system includes one or more combinations of electric auxiliary heating, low-pressure steam heating, medium-pressure steam heating, circulating gas heating, and oil bath heating.

[0016] The present invention also provides a cold-state simulation and characterization method for gas-solid multiphase flow, which uses the aforementioned cold-state simulation and characterization device for gas-solid multiphase flow and includes the following steps: 1) Gas distribution and flow pattern initialization of the multiphase flow cold state simulation device: After the fluidizing gas source is controlled by a precision pressure control valve and a flow control valve to reach the pressure and flow rate required by the process, it enters the fluidizing medium buffer tank until the pressure precision monitor on the fluidizing medium buffer tank reaches the process requirements. Pre-set the end-point speed increase control device on each branch of the fluidizing gas system to the operating state corresponding to the required end-point gas velocity. Control the pressure precision monitor, flow precision control valve, and flow master control valve on pipelines M and L to the operating state corresponding to the process requirements; open the flow master control valve on pipelines M and L to 200~500% of the required opening degree to open the gas path, and then operate the flow master control valve on pipelines M and L to 0.1~70% of the required opening degree to maintain the flow state initialization; 2) Calibration of the multiphase flow cold simulation device and the characterization data acquisition and analysis system: Operate the flow control valves on pipelines M and L to the specified opening degree; add the required amount of fluidizing medium from the feed port, then turn on the characterization data acquisition and analysis system, and open the discharge valve at the bottom of the particle rapid spraying zone to the specified opening degree. After the characterization data acquisition and analysis system collects the calibration data from the particle concentration monitor and the bed micro-differential pressure monitor, it plots the calibration curve and corrects the calibration deviation. 3) Characterization test using a multiphase flow cold-state simulation device: After adding the required amount of fluidizing medium for the characterization test from the feed port, the flow control valves on lines M and L are operated to the required opening degree for the characterization test. Bed characterization data from the particle concentration monitor and bed micro-differential pressure monitor are collected through the characterization data acquisition and analysis system. Sampling and analysis are performed at the discharge valve at the bottom of the particle rapid jetting zone. Simultaneously, sampling and analysis are performed at one or more combinations of the particle setter, particle return system, primary particle settling and collection area, detachable horizontal conveying pipe section I, detachable horizontal conveying pipe section II, return pipe I, and return pipe II. 4) Multi-factor characterization experiments of the multiphase flow cold-state simulation device: By adjusting the flow control valves on pipelines M and L to different test inlet air volumes and adding fluidizing media of different quantities, types, and properties, a multi-factor characterization test of the multiphase flow cold-state simulation device was conducted. Bed characterization data from particle concentration monitors and bed micro-pressure differential monitors were collected through the characterization data acquisition and analysis system, and samples were taken and analyzed at the discharge valve at the bottom of the particle rapid jetting zone. Simultaneously, samples were taken and analyzed at one or more combinations of particle setter, particle return system, primary particle settling and collection zone, detachable horizontal conveying pipe section I, detachable horizontal conveying pipe section II, return pipe I, and return pipe II.

[0017] Compared with the prior art, the beneficial effects of the present invention are: This invention utilizes a multiphase flow cold-state simulation device comprised of a rapid particle jetting zone, a high-efficiency particle mixing zone, a fully fluidized zone, a primary particle settling and collection zone, a particle setter, and a detachable horizontal conveying pipe to achieve cold-state simulation characterization studies of different fluidized media. This invention also provides a gas-solid multiphase flow cold-state simulation characterization method based on a particle concentration monitor, a bed micro-pressure differential monitor, and a characterization data acquisition and analysis system. This method enables automated and numerical analysis of the motion distribution, concentration distribution, velocity distribution, and particle behavior of bed fluidized media. This invention features a high degree of automation and efficient and convenient data analysis, and has broad application prospects in the field of gas-solid multiphase flow cold-state simulation. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 This is a schematic diagram of the structure of the rapid particle ejection zone 8 in this invention.

[0020] Figure 3 This is a schematic diagram of the structure of the high-efficiency particle mixing zone 9.

[0021] Figure 4 A schematic diagram of the structure of the fully fluidized zone 10.

[0022] In the diagram: 1. Gas supply system; 2. Multiphase flow cold state simulation device; 3. Characterization data acquisition and analysis system; 4. Fluidizing gas system; 5. Fluidizing gas source; 6. Fluidizing medium buffer tank; 7. Dehumidification and preheating system; 8. Particle rapid jetting zone; 9. Particle high-efficiency mixing zone; 10. Fully fluidized zone; 11. Detachable horizontal conveying pipe section I; 12. Primary particle settling and collection zone; 13. Detachable horizontal conveying pipe section II; 14. Gas-solid dust collector; 15. Particle settling. 16. Return pipe I; 17. Particle return system; 18. Return pipe II; 19. Feed port; 20. Precision pressure control valve; 21. Flow control valve; 22. Precision pressure monitor; 23. Flow control valve; 24. Particle concentration monitor; 25. Bed micro-pressure differential monitor; 26. End-of-line speed increase control device; 27. Micro-particle filter interlock; 28. Fluidizing medium; 29. ​​End-of-line particle controller; 30. Bottom discharge valve of particle rapid spraying zone. Detailed Implementation

[0023] The present invention will be further explained and described below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only some embodiments of this application, not all embodiments, and are not intended to limit the present invention. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application.

[0024] See Figure 1 This invention provides a fluidization simulation device and method that integrates cold-state simulation of gas-solid multiphase flow with bed data characterization. Unlike traditional cold-state simulation devices, this invention features novel structure, multifunctionality, and numerical characterization. Based on a particle concentration monitor, a bed micro-pressure differential monitor, and a characterization data acquisition and analysis system, this invention's cold-state simulation characterization method for gas-solid multiphase flow enables automated and numerical analysis of the motion distribution, concentration distribution, velocity distribution, and particle behavior of the fluidized bed medium. The technical solution provided by this invention differs fundamentally from existing technologies in terms of technical effect, invention purpose, application scope, and applicable objects. It represents a significant improvement and enhancement of existing technologies and possesses obvious creative and application value.

[0025] See Figure 1 The present invention provides a gas-solid multiphase flow cold state simulation characterization device, which mainly includes a gas supply system 1, a multiphase flow cold state simulation device 2, a characterization data acquisition and analysis system 3, and a fluidized gas system 4.

[0026] See Figure 1 The multiphase flow cold state simulation device 2 is the main part of the structure of the present invention. The gas supply system 1 supplies gas to it, the characterization data acquisition and analysis system 3 collects its experimental data and analyzes it, and the fluidizing gas system 4 loosens and fluidizes the entire multiphase flow cold state simulation device 2. Furthermore, the main structure of the multiphase flow cold state simulation device 2 is mainly composed of a particle rapid spraying zone 8, a particle high-efficiency mixing zone 9, a fully fluidized zone 10, a primary particle settling and collection zone 12, a gas-solid dust collector 14, and a particle setter 15 connected together; furthermore, the angle γ between the return pipe I 16 and the particle setter 15 is 0~160°, and the angle β between the return pipe II 18 and the particle high-efficiency mixing zone 9 is 0~160°. Furthermore, the tops of the fully fluidized zone 10 and the gas-solid dust collector 14 are both connected to the primary particle settling and collection zone 12. The primary particle settling and collection zone 12 is designed as a vertical structure, and its bottom is connected to W via pipes at an angle μ=0~180°. Here, W is one or more combinations of particle setter 15, particle return system 17, primary particle settling and collection zone 12, detachable horizontal conveying pipe section I 11, detachable horizontal conveying pipe section II 13, return pipe I 16, and return pipe II 18. Furthermore, the bottom of the high-efficiency particle mixing zone 9 is connected to the lower end of the particle return system 17 via return pipe II 18, and the bottom of the particle setter 15 is connected to the lower end of the particle return system 17 via return pipe I 16. Below the particle rapid spraying zone 8, there is also a bottom discharge valve 30 for discharging the fluidized medium.

[0027] Furthermore, a particle concentration monitor 24 is installed in the high-efficiency particle mixing zone 9. The high-efficiency particle mixing zone 9, the fully fluidized zone 10, the primary particle settling and collection zone 12, the detachable horizontal conveying pipe section I 11, the detachable horizontal conveying pipe section II 13, and the particle setter 15 are each connected to a bed micro-pressure differential monitor 25. Signals from the particle concentration monitor 24 and the bed micro-pressure differential monitor 25 are uploaded to the characterization data acquisition and analysis system 3, which performs data acquisition and analysis.

[0028] See Figure 1 and Figure 2 The structure of the rapid particle jetting zone 8 is further described. Its overall structure is T-shaped, consisting of a riser and an air inlet connected to the side wall of the riser. The riser is the main part of the rapid particle jetting zone 8, with a height of P and a diameter of Q = 0.01P~0.95P. The air inlet is located on the lower side of the riser and is connected to the incoming air. The length of the air inlet is B, and its diameter is A = 0.01B~0.95B. The distance between the lower edge of the air inlet and the bottom of the riser is C = 0.01P~0.95P. Through this design, different flow field conditions can be achieved in the rapid jetting zone 8.

[0029] See Figure 3 The structure of the high-efficiency mixing zone 9 is further elaborated. The height of the columnar part is h, its diameter D = 0.01h~0.95h, and the bottom included angle α = 0~180°. Different fluidization effects are achieved through different designs.

[0030] See Figure 4 The structure of the fully fluidized zone 10 is further described. The height of the cylindrical part is M, its diameter is E=0.01M~0.95M, and the bottom included angle θ=0~180°. A feeding port 19 is provided on the fully fluidized zone 10, with a feeding port diameter d=0.01E~0.95E. The distance between the lower edge of the feeding port 19 and the bottom of the fully fluidized zone 10 is L=0.01M~0.95M, which is used to add fluidizing medium. Different fluidization effects can be achieved through different designs.

[0031] Through the above-mentioned structural and connection features, the basic structural functions of the multiphase flow cold state simulation device are realized.

[0032] See Figure 1To characterize the instantaneous changes of the gas-solid multiphase flow bed in real time, accurately, and numerically, the gas-solid multiphase flow cold-state simulation characterization device of the present invention is also equipped with a bed data characterization system based on the characterization data acquisition and analysis system 3. First, the high-efficiency particle mixing zone 9, the fully fluidized zone 10, the primary particle settling and collection zone 12, the detachable horizontal conveying pipe section I 11, the detachable horizontal conveying pipe section II 13, and the particle setter 15 are all connected to the bed micro-pressure difference monitor 25 through the micro-particle filter locking connector 27. Second, the high-efficiency particle mixing zone 9 is connected to the particle concentration monitor 24. Third, the bed characteristic signals collected by the particle concentration monitor 24 and the bed micro-pressure difference monitor 2 are all uploaded to the characterization data acquisition and analysis system 3 for data analysis and calculation.

[0033] See Figure 1 Furthermore, the connection method between the particle concentration monitor 24 and the bed micro-pressure differential monitor 25 and the multiphase flow cold state simulation device 2 has certain spatial characteristics: First, the particle concentration monitor 24 is divided into K groups according to the vertical spacing t = 0.11h~0.95h, and is evenly distributed in a ring radially at the upper, middle or lower part of the particle high-efficiency mixing zone 9. One purpose of this feature is to achieve uniform monitoring of particle concentration and avoid local monitoring errors; Second, in the particle high-efficiency mixing zone 9 and the fully fluidized zone 10, the bed micro-pressure differential monitor 25 is divided into N groups according to the vertical spacing Y = 0.01(M+h)~0.95(M+h), and is evenly distributed in a ring radially at the upper, middle or lower part of the particle high-efficiency mixing zone 9 and the fully fluidized zone 10. In the lower part, one purpose of this feature is to avoid local monitoring errors; in the particle settling tank 15, the bed micro-pressure differential monitors 25 are divided into S groups according to the vertical spacing Z = 0.01 (M+h) ~ 0.95 (M+h), and are evenly distributed in a ring radially connected to the middle or lower part of the particle settling tank 15. One purpose of this feature is to avoid local monitoring errors; in the primary particle settling collection zone 12, the bed micro-pressure differential monitors 25 are divided into T groups according to the spacing g = 0.01J ~ 0.95J, and are evenly distributed in a ring radially connected to the middle or lower part of the primary particle settling collection zone 12, where J is the height of the primary particle settling collection zone 12. One purpose of this feature is to avoid local monitoring errors; in the detachable horizontal conveying pipe section I The bed micro-differential pressure monitors 25 are divided into R groups according to the spacing U=0.01(M+h+J)~0.95(M+h+J), and are evenly connected to the detachable horizontal conveying pipe section I 11 and the detachable horizontal conveying pipe section II 13. One purpose of adopting this feature is to avoid local monitoring errors.

[0034] See Figure 1Furthermore, to fully fluidize the gas-solid multiphase flow cold-state simulation characterization device, multiple streams of fluidized loosening gas are connected to it: First, the gas supply system 1 includes a fluidized gas source 5, a precision pressure control valve 20, a fluidized medium buffer tank 6, and a dehumidification preheating system 7 connected in sequence; and flow control valves 21 are installed between the precision pressure control valve 20 and the fluidized medium buffer tank 6, and between the fluidized medium buffer tank 6 and the dehumidification preheating system 7; Second, after being controlled by the precision pressure control valve 20 and the flow control valve 21, the fluidized gas source 5 enters the fluidized medium buffer tank 6 to maintain a stable gas supply for the system. Subsequently, after passing through the flow control valve 21 and the dehumidification preheating system, it is divided into two pipelines, M and L. Pipeline M is connected to the fluidized gas system 4 through the flow control valve 21, the pressure precision monitor 22, and the flow master control valve 23 as the source of the entire loosening gas system. Pipeline L is connected to the particle... The rapid jetting zone 8; third, the fluidizing gas system 4 is subsequently divided into four major branches to fluidize the entire gas-solid multiphase flow cold state simulation characterization device: in the high-efficiency particle mixing zone 9, the fluidizing gas system 4 is divided into group F branches, which are connected to the upper, middle or lower part of the high-efficiency particle mixing zone 9 in a radially uniform manner through the end speed-increasing control device 26; in the primary particle settling and collection zone 12, the fluidizing gas system 4 is divided into group I branches, which are connected to the upper, middle or lower part of the primary particle settling and collection zone 12 in a radially uniform manner through the end speed-increasing control device 26; in the particle return system 17, the fluidizing gas system 4 is divided into group G branches, which are connected to the upper, middle or lower part of the particle return system 17 in a radially uniform manner through the end speed-increasing control device 26; in the particle setter 15, the fluidizing gas system 4 is divided into group H branches, which are connected to the upper, middle or lower part of the particle setter 15 in a radially uniform manner through the end speed-increasing control device 26.

[0035] Furthermore, the fluidizing medium of the gas-solid multiphase flow cold state simulation characterization device is one or more mixed particles of coal, coke fines, oil shale, petroleum coke, dry sludge, quartz sand, catalyst, plastic, catalyst carrier, plant fruit, garbage and biomass; the gas source 5 of the gas-solid multiphase flow cold state simulation characterization device includes one or more mixtures of nitrogen, oxygen, steam, syngas, carbon monoxide, hydrogen, methane, air, carbon dioxide, flue gas, helium and argon.

[0036] Furthermore, to ensure the stability of the fluidization in the gas-solid multiphase flow cold simulation characterization device, a dehumidification and preheating system 7 is introduced to perform pretreatment of the fluidizing gas using one or more methods, including dehumidification and heating. The dehumidification and preheating system 7 is connected after the fluidizing medium buffer tank 6, and a flow control valve 21 is installed directly between the two. The dehumidification methods of the dehumidification and preheating system 7 include one or more combinations of cryogenic freezing, lithium bromide liquid adsorption, honeycomb adsorption, compressor, silica gel particle adsorption, and porous material adsorption. The heating methods of the dehumidification and preheating system 7 include one or more combinations of electric auxiliary heating, low-pressure steam heating, medium-pressure steam heating, circulating gas heating, and oil bath heating.

[0037] In another aspect, the present invention provides a cold-state simulation and characterization method for gas-solid multiphase flow, specifically including the following steps: First, it should be noted that the fluidizing medium is one or more mixed particles selected from coal, coke fines, oil shale, petroleum coke, dried sludge, quartz sand, catalyst, plastic, catalyst carrier, plant fruits, waste, and biomass. The gas source 5 includes one or more mixtures of nitrogen, oxygen, steam, syngas, carbon monoxide, hydrogen, methane, air, carbon dioxide, flue gas, helium, and argon. This embodiment is only described using quartz sand and nitrogen as examples; the described embodiments are only a part of the embodiments of this application, not all of them, and are not intended to limit the invention.

[0038] 1) Gas distribution and flow pattern initialization of gas-solid multiphase flow cold simulation device 2: 1.1) Adjust the gas supply system 1 to meet the process requirements.

[0039] In a further embodiment of the present invention, the fluidizing gas source 5 enters the fluidizing medium buffer tank 6 after being controlled by the precision pressure control valve 20 and the flow control valve 21 to reach the pressure and flow rate required by the process. The fluidizing gas source 5 enters the fluidizing medium buffer tank 6 until the pressure precision monitor 22 on the fluidizing medium buffer tank 6 reaches the process requirements. The main purpose of this step is to stabilize the gas source of the system.

[0040] 1.2) Pre-set the end-of-line speed control device 26 of each branch of the fluidizing gas system 4 to the operating state corresponding to the required end-of-line gas velocity.

[0041] In a further embodiment of the present invention, specifically, the end-of-line speed increase control device 26 of the fluidizing gas line F+I+G+H attached to the fluidizing gas system 4 is pre-set to the operating state corresponding to the required end-of-line gas speed. The main purpose of this step is to adjust each fluidizing gas through the end-of-line speed increase control device 26.

[0042] 1.3) Control the pressure precision monitor 22, flow precision control valve 21, and flow master control valve 23 on pipelines M and L to the operating state corresponding to the process requirements; open the flow master control valve 23 on pipelines M and L to 200~500% of the required opening degree to open the gas path, and then operate the flow master control valve 23 on pipelines M and L to 0.1~70% of the required opening degree to maintain the flow state initialization.

[0043] In a further embodiment of the present invention, specifically, the pressure precision monitor 22, flow precision control valve 21, and flow master control valve 23 on pipelines M and L are set to the operating state corresponding to the process requirements; the flow master control valve 23 on pipelines M and L is opened to 200-500% of the required gas volume to open the gas path, and then the flow master control valve 23 is operated to 0.1-70% of the required gas volume to maintain the flow state initialization.

[0044] 2) Calibration of the multiphase flow cold simulation device 2 and the characterization data acquisition and analysis system 3: For different fluidized media, targeted calibration tests are required. The flow control valve 23 on operating pipelines M and L is opened to the required calibration gas volume. The required amount of fluidized medium is added from the feed port 19 to the fully fluidized zone 10. Then, the characterization data acquisition and analysis system 3 is turned on, and the discharge valve 30 at the bottom of the particle rapid jetting zone is opened to the calibration degree. After collecting the calibration data from the particle concentration monitor 24 and the bed micro-differential pressure monitor 25, the characterization data acquisition and analysis system 3 plots the calibration curve and corrects for calibration deviations.

[0045] 3) Characterization experiments using the multiphase flow cold simulation device 2: After adding the required amount of fluidizing medium for the characterization test from the feed port 19, the flow control valve 23 on the operating pipelines M and L is adjusted to the required opening degree for the characterization test. The bed characterization data from the particle concentration monitor 24 and the bed micro-pressure differential monitor 25 are collected by the characterization data acquisition and analysis system 3. Sampling and analysis are performed at the discharge valve 30 at the bottom of the particle rapid jetting zone. Simultaneously, sampling and analysis are performed at one or more combinations of the particle setter 15, the particle return system 17, the primary particle settling and collection area 12, the detachable horizontal conveying pipe section I 11, the detachable horizontal conveying pipe section II 13, the return pipe I 16, and the return pipe II 18.

[0046] 4) Multi-phase flow cold-state simulation device 2 multi-factor characterization test: The flow control valves 23 on the operating pipelines M and L are used to introduce different test air volumes and fluidizing media of different quantities, types, and properties to conduct multi-factor characterization tests on the multiphase flow cold state simulation device 2. The bed characterization data of the particle concentration monitor 24 and the bed micro-pressure difference monitor 25 are collected by the characterization data acquisition and analysis system 3 and sampled and analyzed at the discharge valve 30 at the bottom of the particle rapid jetting zone. At the same time, sampling and analysis are performed at one or more combinations of particle setter 15, particle return system 17, primary particle settling and collection area 12, detachable horizontal conveying pipe section I 11, detachable horizontal conveying pipe section II 13, return pipe I 16, and return pipe II 18.

[0047] The above-mentioned gas-solid multiphase flow cold state simulation characterization method can realize the fluidization of fluidized media under different conditions. Furthermore, by collecting bed operation data from particle concentration monitor 24 and bed micro-pressure difference monitor 25 on the multiphase flow cold state simulation device 2, and through calculation and experimental analysis by the characterization data acquisition and analysis system 3, numerical calculation results such as the motion distribution, concentration distribution, velocity distribution and particle behavior of the bed fluidized medium can be obtained, thereby further understanding the fluidization behavior of a specific fluidized medium.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of the claims.

Claims

1. A gas-solid multiphase flow cold-state simulation and characterization device, characterized in that, It includes a gas supply system (1), a multiphase flow cold state simulation device (2), a characterization data acquisition and analysis system (3), and a fluidizing gas system (4), wherein the fluidizing gas system (4) loosens and fluidizes the entire multiphase flow cold state simulation device (2); The multiphase flow cooling simulation device (2) includes a particle rapid jetting zone (8), a particle high-efficiency mixing zone (9) and a fully fluidized zone (10) connected sequentially from bottom to top according to the direction of incoming gas. The particle rapid jetting zone (8) is also connected to a bottom discharge valve (30) of the particle rapid jetting zone. The mainstream gas of the multiphase flow cooling simulation device (2) is introduced from the particle rapid jetting zone (8) through pipeline L. The fully fluidized zone (10) is connected to the primary particle settling and collection zone (12) via a detachable horizontal conveying pipe section I (11). The primary particle settling and collection zone (12) is connected to the gas-solid dust collector (14) via a detachable horizontal conveying pipe section II (13) at its top. The gas-solid dust collector (14) is connected to the particle setter (15). The bottom of the high-efficiency particle mixing zone (9) is connected to the lower end of the particle return system (17) via a return pipe II (18), and the bottom of the particle setter (15) is connected to the lower end of the particle return system (17) via a return pipe I (16). The high-efficiency particle mixing zone (9) is equipped with a particle concentration monitor (24); the high-efficiency particle mixing zone (9), the fully fluidized zone (10), the primary particle settling and collection zone (12), the detachable horizontal conveying pipe section I (11), the detachable horizontal conveying pipe section II (13), and the particle setter (15) are all connected to bed micro-pressure differential monitors (25) via micro-particle filter interlocking devices (27); the signals from the particle concentration monitor (24) and the bed micro-pressure differential monitor (25) are all uploaded to the characterization data acquisition and analysis system (3); Wherein, the height of the particle rapid jetting zone (8) is P, and the diameter is Q=0.01P~0.95P; the air inlet of the particle rapid jetting zone (8) connected to the pipeline L is located on the lower side, the length of the air inlet is B, and the diameter is A=0.01B~0.95B; the distance between the lower edge of the air inlet and the bottom of the particle rapid jetting zone (8) is C=0.01P~0.95P; The columnar part of the high-efficiency particle mixing zone (9) has a height of h, a diameter D of 0.01h~0.95h, and a bottom angle α of 0~180°. The height of the cylindrical part of the fully fluidized zone (10) is M, the diameter is E=0.01M~0.95M, and the bottom included angle θ=0~180°; Q<D<E; a feeding port (19) is provided on the fully fluidized zone (10), the diameter of the feeding port is d=0.01E~0.95E, and the distance between the lower edge of the feeding port (19) and the bottom of the fully fluidized zone (10) is L=0.01M~0.95M; the feeding port (19) is used to add the fluidizing medium of the multiphase flow cold state simulation device (2).

2. The gas-solid multiphase flow cold-state simulation and characterization device according to claim 1, characterized in that, The angle γ between the return pipe I (16) and the particle setter (15) is 0~160°, and the angle β between the return pipe II (18) and the particle high-efficiency mixing zone (9) is 0~160°.

3. The gas-solid multiphase flow cold-state simulation and characterization device according to claim 1, characterized in that, The particle concentration monitor (24) is divided into K groups according to the vertical spacing t=0.11h~0.95h, and is evenly distributed in a ring radially to the upper, middle or lower part of the high-efficiency particle mixing zone (9); where h is the height of the columnar part of the high-efficiency particle mixing zone (9); In the high-efficiency particle mixing zone (9) and the fully fluidized zone (10), the bed micro-pressure differential monitor (25) is divided into N groups according to the vertical spacing Y = 0.01(M+h)~0.95(M+h), and is connected in a ring-shaped radial distribution to the upper, middle or lower part of the high-efficiency particle mixing zone (9) and the fully fluidized zone (10); where M is the height of the cylindrical part of the fully fluidized zone (10); In the particle setter (15), the bed micro-pressure differential monitor (25) is divided into S groups according to the vertical spacing Z=0.01(M+h)~0.95(M+h), and is evenly distributed in a ring radially connected to the middle or lower part of the particle setter (15). In the primary particle settling and collection zone (12), the bed micro-pressure differential monitors (25) are divided into T groups according to the vertical spacing g=0.01J~0.95J, and are evenly distributed in a ring radially in the middle or lower part of the primary particle settling and collection zone (12); where J is the height of the primary particle settling and collection zone (12); In the detachable horizontal conveying pipe section I (11) and the detachable horizontal conveying pipe section II (13), the bed micro differential pressure monitor (25) is divided into R groups according to the spacing U=0.01(M+h+J)~0.95(M+h+J), and is evenly connected to the detachable horizontal conveying pipe section I (11) and the detachable horizontal conveying pipe section II (13).

4. The gas-solid multiphase flow cold-state simulation and characterization device according to claim 1, characterized in that, In the high-efficiency particle mixing zone (9), the fluidizing gas system (4) is divided into F groups of branches, which are connected to the upper, middle or lower part of the high-efficiency particle mixing zone (9) in a radially uniform manner through the end speed-increasing control device (26). In the primary particle settling collection zone (12), the fluidizing gas system (4) is divided into I groups of branches, which are connected to the upper, middle or lower part of the primary particle settling collection zone (12) in a radially uniform manner through the end speed-increasing control device (26). In the pellet return system (17), the fluidizing gas system (4) is divided into G group branches, which are connected to the upper, middle or lower part of the pellet return system (17) in a radially uniform manner through the end speed increase control device (26). In the particle setter (15), the fluidizing gas system (4) is divided into H groups of branches, which are connected to the upper, middle or lower part of the particle setter (15) in a radially uniform manner through the end speed control device (26).

5. The gas-solid multiphase flow cold-state simulation and characterization device according to claim 1, characterized in that, The bottom of the primary particle settling and collection area (12) is connected to W at an angle μ=0~180°; W is one or more of the following: particle setter (15), particle return system (17), primary particle settling and collection area (12), detachable horizontal conveying pipe section I (11), detachable horizontal conveying pipe section II (13), return pipe I (16) and return pipe II (18).

6. The gas-solid multiphase flow cold-state simulation and characterization device according to claim 1, characterized in that, The gas supply system (1) includes a fluidizing gas source (5), a precision pressure control valve (20), a fluidizing medium buffer tank (6), and a dehumidification preheating system (7) connected in sequence. A flow control valve (21) is installed between the precision pressure control valve (20) and the fluidizing medium buffer tank (6), and between the fluidizing medium buffer tank (6) and the dehumidification preheating system (7). The subsequent pipelines of the dehumidification preheating system (7) are divided into two lines, M and L: pipeline M is connected to the fluidizing gas system (4) through the flow control valve (21), the pressure precision monitor (22), and the flow control valve (23), and pipeline L is connected to the particle rapid spraying zone (8) through the flow control valve (21), the pressure precision monitor (22), and the flow control valve (23).

7. The gas-solid multiphase flow cold-state simulation and characterization device according to claim 6, characterized in that, The fluidizing medium is a mixture of one or more particles of coal, coke dust, oil shale, petroleum coke, dried sludge, quartz sand, catalyst, plastic, catalyst carrier, plant fruit, garbage, and biomass; the gas source (5) includes one or more mixtures of nitrogen, oxygen, steam, syngas, carbon monoxide, hydrogen, methane, air, carbon dioxide, flue gas, helium, and argon; the dehumidification and preheating system (7) includes a combination of one or more methods of dehumidification and heating functions; the dehumidification method of the dehumidification and preheating system (7) includes a combination of one or more methods of cryogenic freezing, lithium bromide liquid adsorption, honeycomb adsorption, compressor, silica gel particle adsorption, and porous material adsorption; the heating method of the dehumidification and preheating system (7) includes one or more of the following: electric auxiliary heating, low-pressure steam heating, medium-pressure steam heating, circulating gas heating, and oil bath heating.

8. A cold-state simulation and characterization method for gas-solid multiphase flow, characterized in that, The gas-solid multiphase flow cold simulation characterization apparatus according to claim 6 or 7 includes the following steps: 1) Multiphase flow cold state simulation device (2) Gas distribution and flow state initialization: The fluidizing gas source (5) is controlled by the precision pressure control valve (20) and the flow control valve (21) to reach the pressure and flow rate required by the process and then enters the fluidizing medium buffer tank (6) until the pressure precision monitor (22) on the fluidizing medium buffer tank (6) reaches the process requirements; The end-point speed control device (26) of each branch of the fluidizing gas system (4) is pre-set to the operating state corresponding to the required end gas velocity; Control the pressure precision monitor (22), flow precision control valve (21), and flow total control valve (23) on pipelines M and L to the operating state corresponding to the process requirements; open the flow total control valve (23) on pipelines M and L to 200~500% of the required opening degree to open the gas path, and then operate the flow total control valve (23) on pipelines M and L to 0.1~70% of the required opening degree to maintain the flow state initialization; 2) Calibration of the multiphase flow cold simulation device (2) and the characterization data acquisition and analysis system (3): Turn the flow control valve (23) on the operating pipelines M and L to the opening degree required for the calibration gas volume; add the required amount of fluidizing medium from the feed port (19), then turn on the characterization data acquisition and analysis system (3), and open the bottom discharge valve (30) of the particle rapid spraying zone to the calibration opening degree. After the characterization data acquisition and analysis system (3) collects the calibration data of the particle concentration monitor (24) and the bed micro pressure difference monitor (25), it plots the calibration curve and corrects the calibration deviation. 3) Characterization test of multiphase flow cold simulation device (2): After adding the required amount of fluidized medium for the characterization test from the feed port (19), the flow control valve (23) on the operating pipelines M and L is adjusted to the required opening for the characterization test. The bed characterization data of the particle concentration monitor (24) and the bed micro-pressure differential monitor (25) are collected by the characterization data acquisition and analysis system (3). Sampling and analysis are performed at the discharge valve (30) at the bottom of the particle rapid spraying zone. Sampling and analysis are also performed at one or more combinations of the particle settling device (15), the particle return system (17), the primary particle settling collection area (12), the detachable horizontal conveying pipe section I (11), the detachable horizontal conveying pipe section II (13), the return pipe I (16), and the return pipe II (18). 4) Multiphase flow cold state simulation device (2) Multifactor characterization test: The flow control valve (23) on the operating pipelines M and L is used to introduce different test air intakes and different test quantities, types and properties of fluidizing media to conduct multi-factor characterization tests of the multiphase flow cold state simulation device (2). The bed characterization data of the particle concentration monitor (24) and the bed micro pressure difference monitor (25) are collected through the characterization data acquisition and analysis system (3) and sampled and analyzed at the bottom discharge valve (30) of the particle rapid spraying zone. At the same time, sampling and analysis are performed at one or more combinations of the particle setter (15), particle return system (17), primary particle settling collection area (12), detachable horizontal conveying pipe section I (11), detachable horizontal conveying pipe section II (13), return pipe I (16) and return pipe II (18).

Images