Visual device for powder generation and transportation and use method

Abstract

The invention discloses a powder generation and transportation visualization device and a use method, and belongs to the technical field of gas-solid two-phase flow experiments, the powder generation and transportation visualization device comprises a gas and powder generation module, a gas pipeline transportation module and a tail gas treatment and powder collection module which are communicated in sequence, the gas and powder generation module fuses solid particle size powder or powder generated by reaction with transportation gas to form a two-phase flow composed of gas and solid particles, the two-phase flow is subjected to long-distance transportation through the gas pipeline transportation module, and the sedimentation phenomenon of the powder is visually observed; and finally, the gas enters the tail gas treatment and powder collection module, powder in the gas is collected, solid particles are recycled, and pollution to the environment is reduced. The visualization device for powder generation and transportation provides an observation and simulation method for powder transportation and sedimentation in a negative pressure vacuum gas pipeline system.

Description

Technical Field

[0001] This invention relates to the field of gas-solid two-phase flow experimental technology, and in particular to a visualization device and method for powder generation and transport. Background Technology

[0002] For process systems that complete a specific process flow, the system is typically isolated from the outside world, maintains a certain pressure, and transports specific materials, while avoiding the presence of other impurities within the system. However, during long-term operation, atmospheric air continuously permeates into the system. The process gases within the system react with water vapor or other organic gases, producing micron-sized or even smaller solid powders. During the airflow process, these powders collide and coalesce, gradually increasing in size. When the inertial force of the powder moving with the airflow is insufficient to counteract gravity, it settles under the influence of friction with the pipes and equipment within the system. Over time, the powder continuously settles onto the inner wall surface. This powder settling within the system can lead to equipment blockage, performance degradation, and even malfunctions. To address these issues, it is necessary to develop a simulation experimental apparatus and method for powder generation and transport to observe the actual transport and settling of powders within pipes and specific components.

[0003] An analysis of the existing process system revealed the following problems: 1. Actual process systems typically employ closed, opaque metal pipes and equipment, making it impossible to directly observe the real-time processes of powder generation, agglomeration, growth, sedimentation, and flow within the system. Problems are only detected when powder sedimentation reaches a certain level, causing abnormal system pressure, equipment blockage, or a decrease in product yield. Early warning and prevention are impossible, leaving only a reactive response. There is a lack of intuitive understanding of the mechanisms, rates, and key locations of powder generation and sedimentation.

[0004] 2. Existing gas-solid two-phase flow experimental setups often focus on studying the transport characteristics of known powders, but are insufficient in simulating the core mechanism of "in-situ powder generation from gaseous reactions." Most setups use dry powder generators to directly inject pre-prepared powder. This method cannot simulate the dynamic process of "gas reaction → nucleation → growth." The pre-prepared powder differs from the powder generated by the actual reaction in terms of morphology, particle size distribution, and surface characteristics, affecting the realism of the experiment. Furthermore, actual process systems often operate under vacuum or specific pressures (positive or negative). The pressure environment directly affects the gas diffusion rate, reaction rate, and collision and coalescence efficiency of powder particles; ignoring pressure factors will distort the simulation results.

[0005] 3. A fixed experimental setup can usually only study one pipe diameter and one layout, and cannot simulate the complex piping network in actual industrial systems, such as elbows, reducers, orifice plates, valves, etc. These key components are the areas most prone to powder settling and blockage.

[0006] In summary, existing technologies suffer from problems such as difficulty in observation, simulation distortion, and poor flexibility, failing to effectively meet the urgent need for forward-looking, mechanistic, and predictive research on powder problems in process systems. There is a lack of a comprehensive powder generation and transport simulation experimental device that can highly reproduce the internal environment of the real system, has visualization observation capabilities, and is modular and scalable. Summary of the Invention

[0007] The purpose of this invention is to provide a visualization device for powder generation and transportation, addressing the technical deficiencies in the existing technology.

[0008] Another object of the present invention is to provide a method of using a visualization device for powder generation and transport.

[0009] The technical solution adopted to achieve the purpose of this invention is: A visualization device for powder generation and transportation includes a gas and powder generation module, a gas pipeline transportation module, and a tail gas treatment and powder collection module connected in sequence. The gas and powder generation module fuses solid-particle-size powder or powder generated by reaction with the transportation gas to form a two-phase flow composed of gas and solid particles. The two-phase flow is transported over long distances through the gas pipeline transportation module, and the powder sedimentation phenomenon is visualized and observed. Finally, it enters the tail gas treatment and powder collection module to collect the powder in the gas, realize the recycling of solid particles, and reduce environmental pollution. The gas and powder generation module includes a gas-carrying powder transport unit and a powder generation transport unit, which are respectively connected to the inlet of the gas pipeline transport module.

[0010] In the above technical solution, the gas-carrying powder transport unit includes a compressed air pump, a powder storage tank, a powder conveying device, and a vacuum generator. The powder storage tank is connected to the powder conveying device, the outlet of the powder conveying device is connected to the inlet of the vacuum generator, the vacuum generator is connected to the compressed air pump, and the outlet of the vacuum generator is connected to the inlet of the gas pipeline transport module.

[0011] In the above technical solution, the powder generation and transportation unit includes a nitrogen high-pressure cylinder, a first gas source storage tank, a second gas source storage tank, and a reaction gas path device. The first gas source storage tank is connected to the first gas inlet of the reaction gas path device, the second gas source storage tank is connected to the second gas inlet of the reaction gas path device, the first gas inlet and the second gas inlet are opposite to each other, the nitrogen high-pressure cylinder is connected to the third gas inlet of the reaction gas path device, the outlet of the reaction gas path device is connected to the inlet of the gas pipeline transportation module, and the third gas inlet is opposite to the outlet of the reaction gas path device.

[0012] In the above technical solution, nozzles are provided at both the first gas inlet and the second gas inlet, and the two nozzles are arranged opposite to each other.

[0013] In the above technical solution, a mass flow controller is installed on the first gas source storage tank, and a preheating evaporator is installed in the second gas source storage tank, and a mass flow controller is also installed on the second gas source storage tank.

[0014] In the above technical solution, the gas pipeline transportation module includes a mounting bracket assembly and a transparent pipeline assembly mounted on the mounting bracket assembly via a quick-release connection assembly. The transparent pipeline assembly includes multiple visible straight pipe sections and curved pipes. The multiple visible straight pipe sections are arranged sequentially at intervals, and their ends are connected sequentially via curved pipes to form a long-distance visible transportation pipeline. The inlet of the long-distance visible transportation pipeline is connected to the outlet of the vacuum generator or the outlet of the reaction gas circuit device. The outlet of the long-distance visible transportation pipeline is connected to the inlet of the exhaust gas treatment and powder collection module.

[0015] In the above technical solution, metal corrugated pipe compensators are installed at intervals on the visualized straight pipe section and the curved pipe to ensure that the transparent pipe assembly is centered and stable.

[0016] In the above technical solution, the mounting bracket assembly includes two vertically arranged long channel steels and short channel steels fixed at intervals on each long channel steel by T-bolts. The short channel steels arranged on the two long channel steels are located on the same horizontal plane in pairs. The short channel steels located on the same horizontal plane are used to fix the ends of the visible straight pipe section.

[0017] In the above technical solution, one of the visualized straight pipe sections can be replaced by a typical structure pipe assembly, which is an orifice plate structure pipe assembly, a valve core structure pipe assembly, or a reducing structure pipe assembly. All of these are installed in the long-distance visualized transport pipeline through the quick-release connection assembly to replace any one of the visualized straight pipe sections.

[0018] In the above technical solution, the orifice plate structure pipe assembly includes a transparent straight pipe and an orifice plate arranged radially inside the transparent straight pipe; the valve core structure pipe assembly includes a transparent straight pipe and a valve core arranged inside the transparent straight pipe; the reducing structure pipe assembly includes a transparent straight pipe and a reducing pipe arranged inside the transparent straight pipe, wherein the reducing pipe gradually reduces the diameter of the transparent straight pipe and maintains the reduced diameter.

[0019] In the above technical solution, the exhaust gas treatment and powder collection module includes a powder recovery component, a powder filtration component, and a gas collection and evacuation component. The powder recovery component includes four cyclone filters connected in series. The inlet of the first cyclone filter is connected to the outlet of a long-distance visible transport pipeline, and the outlet of the last cyclone filter is connected to the powder filtration component. The powder filtration component uses a filter element made of polytetrafluoroethylene (PTFE) or borosilicate glass fiber. The gas collection and evacuation component includes a collection container and a corrosion-resistant dry vacuum pump that are interconnected by pipelines. The collection container is connected to the powder filtration component.

[0020] Another aspect of the present invention includes a method of using the aforementioned visualization device for powder generation and transport, comprising the following steps: Step 1: If a gas-carrying powder transport unit is selected, the inlet of the powder generation and transport unit and the long-distance visual transport pipeline are sealed with a blind flange. Step 2: Start the corrosion-resistant dry vacuum pump to evacuate the entire device to a certain negative pressure state, close the inlet of the long-distance visual transport pipeline, observe the change of the pressure gauge value, and confirm that the system is airtight. Step 3: If the gas carries solid powder of different particle sizes, turn on the compressed air pump, and the compressed air enters the vacuum generator. A negative pressure is generated at the suction port of the vacuum generator. At the same time, solid powder of different particle sizes is poured into the powder storage tank. The powder conveying device is started. The powder is quantitatively and stably drawn out from the powder storage tank and sent into the vacuum generator. Under the action of high-speed airflow, the powder is instantly atomized to form a uniform gas-solid two-phase flow, which is then blown into a long-distance visible transport pipeline. To generate powder from different gas reactions: Activate the preheating evaporator in the dual gas source tank, open the high-pressure nitrogen cylinder, establish a stable nitrogen flow field, and then simultaneously open both the first and second gas source tanks. The two reaction gases are ejected through the nozzles of the reaction gas path device, meet and react to generate solid nanoparticle powder. The nitrogen flow carries the powder to form a gas-solid two-phase flow, which is then transported into a long-distance visible transport pipeline.

[0021] Step 4: The gas-solid two-phase flow formed in Step 3 flows stably in a long-distance visualized transport pipeline. The transport status and sedimentation of powder particles in the transported gas-solid two-phase flow in the visualized straight pipe section and curved pipe are observed and recorded to obtain the significance of the simulation experiment under different scenarios.

[0022] Step 5, Visual observation and recording of typical structural pipe fittings: The experiment can be stopped accordingly for different experimental scenarios, and one of the visualized straight pipe sections can be replaced by an orifice plate structure pipe assembly, valve core structure pipe assembly or reducing structure pipe assembly. Steps 1-3 are repeated to visualize and record the powder particle transport and sedimentation at the typical structural pipe assembly, and the simulation experimental results at the typical structural pipe fittings are obtained.

[0023] Step 6: The gas-solid two-phase flow finally enters the exhaust gas treatment and powder collection module. Part of the powder is collected by the powder recovery component, and another part of the powder is captured by the filter element at the powder filtration component. The remaining impurity gas is collected in the collection container. Finally, the clean gas is vented by the corrosion-resistant dry vacuum pump. After the experiment, the relevant devices in the gas and powder generation module and the exhaust gas treatment and collection module are turned off in sequence to complete the experimental operation.

[0024] Step 7: After the experiment is completed and the entire device is stable, the powder recovery component and powder filtration component will collect and capture the powder and weigh it or perform subsequent analysis. At the same time, the gas pipeline transport module will be disassembled to further observe and sample the sediment on the inner wall of the visualized straight pipe section and the curved pipe section.

[0025] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention proposes a visualization device and method for powder generation and transportation, providing an observation and simulation method for powder transportation and sedimentation problems in negative pressure vacuum gas pipeline systems.

[0026] 2. This invention provides a complete experimental procedure and visualization experimental device for powder transport and sedimentation during gas transport under negative pressure vacuum pipeline. Through experimental observation, the transport behavior of fixed-size powder or generated powder inside the gas transport and propagation process can be further understood, providing experimental basis for subsequent understanding of powder transport and sedimentation principles and optimization of pipeline design and process parameters.

[0027] 3. This invention provides a two-phase flow simulation generator with two modes: gas-carried fixed-size powder and gas-carried reaction-generated powder. The device can be flexibly assembled and can provide experimental means to simulate the transport of fixed-size powder in various scenarios such as powder introduction and powder generation evolution. 4. This invention provides a long-distance visualized transport pipeline that can simulate long-distance transport and typical structure pipeline components. The visualized straight pipe sections can be arbitrarily connected and switched with typical structure pipeline components, providing a visualized observation device and experimental means for simulating and exploring the evolution of powder behavior during long-distance transport with gas in the pipeline and the sedimentation process of powder inside the pipeline under specific typical structures. Attached Figure Description

[0028] Figure 1 A flowchart of a visualization simulation method for powder generation and transport.

[0029] Figure 2 General layout of the powder generation and transport visualization device (front view).

[0030] Figure 3 This is a schematic diagram of a gas-carrying powder transport unit.

[0031] Figure 4 This is a schematic diagram of a powder generation and transport unit.

[0032] Figure 5 General view of the powder generation and transport visualization device (back view).

[0033] Figure 6 A schematic diagram of the internal structure of a typical structural pipe fitting module.

[0034] Among them, 1: base; 2: gas and powder generation module; 2.1: gas-carrying powder transport unit; 2.2: powder generation and transport unit; 3: gas pipeline transport module; 4: typical structure pipeline assembly; 5: exhaust gas treatment and powder collection module; 6: compressed air pump; 7: nitrogen high-pressure cylinder; 8: powder storage tank; 9: powder conveying device; 10: vacuum generator; 11: 11: Gas source storage tank (single-way), 12: Gas source storage tank (second-way), 13: Reaction gas circuit device, 14: Transparent pipe assembly, 14.1 Visual straight pipe section, 14.2: Bend pipe, 15: Quick-release connection assembly, 16: Mounting bracket assembly, 16.1: Long channel steel, 16.2: Short channel steel, 17: Orifice plate structure pipe assembly, 17.1: Orifice plate, 18: Valve core structure pipe assembly, 18.1: Valve core, 19: Reducing structure pipe assembly, 19.1: Reducer, 20: Powder recovery assembly, 21: Powder filtration assembly, 22: Gas collection and evacuation assembly, 22.1: Collection container, 22.2: Corrosion-resistant dry vacuum pump, 23: Wheel, 24: Nozzle. Detailed Implementation

[0035] The present invention will be further described in detail below with reference to specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0036] Example 1 like Figures 1-6 As shown, a visualization device for powder generation and transportation includes a base 1, and a gas and powder generation module 2, a gas pipeline transportation module 3, and a tail gas treatment and powder collection module 5, which are sequentially connected on the base 1. The gas and powder generation module 2 fuses solid-particle powder or powder generated by reaction with the transport gas to form a two-phase flow consisting of a large amount of gas and a small amount of solid particles. The two-phase flow is transported over a long distance through the gas pipeline transportation module 3, and the powder settling phenomenon is visualized. Finally, it enters the tail gas treatment and powder collection module 5 to collect the powder in the gas, realize the recycling of solid particles, and reduce environmental pollution. Preferably, the bottom of the base is equipped with wheels for pushing.

[0037] The gas and powder generation module 2 includes a gas-carrying powder transport unit 2.1 and a powder generation transport unit 2.2, which are respectively connected to the inlet of the gas pipeline transport module 3; like Figure 3 As shown, the gas-carrying powder transport unit 2.1 is used to study the transport and sedimentation laws of powders with known characteristics. It includes a compressed air pump 6, a powder storage tank 8, a powder conveying device 9, and a vacuum generator 10. The powder storage tank 8 is connected to the powder conveying device 9. The outlet of the powder conveying device 9 is connected to the inlet of the vacuum generator 10. The vacuum generator 10 is connected to the compressed air pump 6. The outlet of the vacuum generator 10 is connected to the inlet of the gas pipeline transport module 3. The compressed air generated by the compressed air pump 6 is introduced into the vacuum generator 10, and a negative pressure is generated at the inlet to draw in solid powders of different particle sizes stored in the powder storage tank 8, which are quantitatively conveyed by the powder transport device, and atomized to form a two-phase flow that is blown into the inlet of the gas pipeline transport module 3.

[0038] like Figure 4As shown, the powder generation and transport unit 2.2 is used to accurately simulate the reaction caused by gas leakage in the process system, i.e., the in-situ powder generation process. It includes a nitrogen high-pressure cylinder 7, a primary gas source storage tank 11, a secondary gas source storage tank 12, and a reaction gas path device 13. The primary gas source storage tank 11 is connected to the first gas inlet of the reaction gas path device 13, and the secondary gas source storage tank 12 is connected to the second gas inlet of the reaction gas path device 13. The first and second gas inlets are opposite to each other. The nitrogen high-pressure cylinder 7 is connected to the third gas inlet of the reaction gas path device 13, and the outlet of the reaction gas path device 13 is connected to the inlet of the gas pipeline transport module 3. Opposite to the outlet of the reaction gas path device 13, the reaction gas 1 stored in the first gas source storage tank 11 and the reaction gas 2 stored in the second gas source storage tank 12 enter the reaction gas path device 13 and are rapidly and uniformly mixed and reacted in the nitrogen gas flow generated by the nitrogen high-pressure gas cylinder 8, generating powder particles that enter the gas pipeline transport module 3. Preferably, nozzles are provided at both the first gas inlet and the second gas inlet, and the two nozzles are arranged opposite each other so that the reaction gas 1 and the reaction gas 2 are sprayed against each other. A mass flow controller is installed on the first gas source storage tank 11, and a preheating evaporator is provided in the second gas source storage tank 12, and a mass flow controller is installed on the second gas source storage tank 12.

[0039] The gas pipeline transport module 3 includes a mounting bracket assembly 16 and a transparent pipeline assembly 14 mounted on the mounting bracket assembly 16 via a quick-release connection assembly 15. The transparent pipeline assembly 14 is the main pipeline for gas and powder transport, and is precision-machined from acrylic (PMMA) or polycarbonate (PC) materials with high optical transparency, high surface finish, and good mechanical strength to ensure visibility throughout the transport process. The transparent pipeline assembly 14 includes multiple visible straight pipe sections 14.1 and curved pipes 14.2 (preferably semi-circular pipes). The multiple visible straight pipe sections 14.1 are arranged in parallel at intervals, and their ends are connected sequentially by curved pipes 14.2 to form a long-distance visible transport pipeline. The inlet of the long-distance visible transport pipeline is connected to the outlet of the vacuum generator 10 or the outlet of the reaction gas path device 13, and the outlet of the long-distance visible transport pipeline is connected to the inlet of the exhaust gas treatment and powder collection module 5. The length and number of the visible straight pipe sections 14.1 and curved pipes 14.2 are automatically increased or decreased according to the required pipeline transport distance in different scenarios.

[0040] Preferably, the quick-release connection assembly 15 is used to achieve a quick and reliable sealed connection between each transparent pipe assembly 14. It can be a KF series quick-release flange joint. To avoid installation stress, metal bellows compensators are installed at intervals on the visible straight pipe section 14.1 and the bend pipe 14.2 to ensure that the transparent pipe assembly 14 is aligned and stable.

[0041] Preferably, the mounting bracket assembly 16 provides stable support for the quick-release connection assembly 15 and the transparent pipe assembly 14. The mounting bracket assembly 16 includes two vertically arranged long channel steels 16.1 and short channel steels 16.2 (the number of short channel steels 16.2 is 10) fixed at intervals on each long channel steel 16.1 by T-bolts. Preferably, the short channel steels 16.2 arranged on the two long channel steels 16.1 are located on the same horizontal plane (or the same inclined plane) in pairs. The short channel steels 16.2 located on the same horizontal plane are used to fix the ends of the visible straight pipe section 14.1.

[0042] Furthermore, one of the visualized straight pipe segments 14.1 is replaced with a typical structure pipe assembly 4, which is an orifice plate structure pipe assembly 17, a valve core structure pipe assembly 18, or a reducing structure pipe assembly 19. This assembly is installed in the long-distance visualized transport pipeline via the quick-release connection assembly 15 to replace any one of the visualized straight pipe segments 14.1, thereby simulating powder transport for different structural components. The orifice plate structure pipe assembly 17 includes a transparent straight pipe and an orifice plate 17.1 radially disposed within the transparent straight pipe; the valve core structure pipe assembly 18 includes a transparent straight pipe and a valve core 18.1 disposed within the transparent straight pipe; the reducing structure pipe assembly 19 includes a transparent straight pipe and a reducing pipe 19.1 disposed within the transparent straight pipe. The reducing pipe 19.1 gradually reduces the diameter of the transparent straight pipe while maintaining this reduced diameter.

[0043] The exhaust gas treatment and powder collection module 5 is used to ensure the safety and environmental protection of the experimental process and to realize the recycling of powder. It includes a powder recovery component 20, a powder filtration component 21, and a gas collection and evacuation component 22. The powder recovery component 20 includes four cyclone filters connected in series. The inlet of the first cyclone filter is connected to the outlet of the long-distance visual transport pipeline, and the outlet of the last cyclone filter is connected to the powder filtration component 21. When the exhaust gas carrying powder after passing through the long-distance visual transport pipeline enters the four cyclone filters, a high-speed rotating airflow is formed. Under the action of centrifugal force, the particles are thrown into the collection area of ​​the cyclone filter and the separated gas is discharged into the powder filtration component 21. The collected particles can be recycled. The powder filter assembly 21 uses a filter element made of polytetrafluoroethylene (PTFE) or borosilicate glass fiber. The gas collection and evacuation assembly 22 is located at the end of the entire processing path and includes a collection container 22.1 and a corrosion-resistant dry vacuum pump 22.2 connected to each other via pipes. The collection container 22.1 is connected to the powder filter assembly 21. The collection container 22.1 is used to collect the reaction gas or special working gas by freezing. The corrosion-resistant dry vacuum pump 22.2 is used for evacuating the gas at the end. The entire device provides and maintains a certain pressure to overcome the flow resistance of each module, guide the orderly flow of gas, establish a stable airflow, collect the working gas for subsequent reuse, and safely pump the permanent gas that cannot be condensed to the atmosphere to ensure the normal operation of the system.

[0044] Example 2 This embodiment provides a method for using the visualization device for powder generation and transport described in Embodiment 1, including the following steps: Step 1, Select the powder generation method: If the gas-carrying powder transport unit 2.1 is selected, the powder generation and transport unit 2.2 and the inlet of the long-distance visible transport pipeline are sealed by a blind plate; if the powder generation and transport unit 2.2 is selected, the gas-carrying powder transport unit 2.1 and the inlet of the long-distance visible transport pipeline are sealed by a blind plate. Step 2: Initialize the experimental system. Start the corrosion-resistant dry vacuum pump 22.2 to evacuate the entire device to a certain negative pressure state. Close the inlet of the long-distance visual transport pipeline and observe the change in the pressure gauge value to confirm that the system is airtight.

[0045] Step 3: If the gas carries solid powder of different particle sizes, turn on the compressed air pump 6, and the compressed air enters the vacuum generator 10. A negative pressure is generated at the suction port of the vacuum generator 10. At the same time, solid powder of different particle sizes (such as 10-micron spherical alumina powder) is poured into the powder storage tank 8. The powder conveying device 6 is started. The powder is quantitatively and stably drawn out from the powder storage tank 8 and sent into the vacuum generator 10. Under the action of high-speed airflow, the powder is atomized instantly to form a uniform gas-solid two-phase flow, and then blown into a long-distance visible transport pipeline. For different gas reactions that generate powder: start the preheating evaporator in the dual gas source storage tank 12, turn on the high-pressure nitrogen cylinder 7 to establish a stable nitrogen flow field, and then simultaneously turn on the first gas source storage tank 11 (such as TiCl4 gas) and the second gas source storage tank 12 (such as water vapor) and the corresponding pipelines. The two reaction gases (TiCl4 gas and water vapor) are sprayed out through the nozzle of the reaction gas path device 13, meet and react (such as the hydrolysis reaction TiCl4(g)+2H2O(g)→TiO2(s)+4HCl(g)), generating fine solid nanoparticle powder (initial particles, such as titanium dioxide (TiO2)). The nitrogen gas flow carries the powder to form a gas-solid two-phase flow and transports it into a long-distance visible transport pipeline.

[0046] Step 4: The gas-solid two-phase flow formed in Step 3 flows stably in a long-distance visualized transport pipeline. The transport status and sedimentation of powder particles in the transported gas-solid two-phase flow in the visualized straight pipe section 14.1 and the curved pipe 14.2 (90-degree bend) are observed and recorded to obtain the significance of the simulation experiment under different scenarios.

[0047] Step 5, Visual observation and recording of typical structural pipe fittings: The experiment can be stopped accordingly for different experimental scenarios, and one of the visualized straight pipe sections 14.1 can be replaced by the orifice plate structure pipe assembly 17, valve core structure pipe assembly 18 or reducing structure pipe assembly 19. Steps 1-3 are repeated to visualize and record the powder particle transport and sedimentation at the typical structural pipe assembly 4, and obtain the simulation experimental results at the typical structural pipe assembly 4.

[0048] Step 6: The gas-solid two-phase flow finally enters the tail gas treatment and powder collection module 5. Most of the powder is collected by the powder recovery component 20, and the remaining small powder particles are captured by the filter element at the powder filtration component 21. The remaining impurity gases, such as the impurity gases generated in the reaction, are collected in the collection container 22.1. Finally, the relatively clean gas is vented by the corrosion-resistant dry vacuum pump 22.2. After the experiment, the relevant devices in the gas and powder generation module 2 and the tail gas treatment and collection module are turned off in sequence to complete the experimental operation.

[0049] Step 7: After the experiment is completed and the entire device is stable, the powder recovery component 20 and the powder filtration component 21 are used to recover the collected and captured powder and weigh or perform subsequent analysis. At the same time, the gas pipeline transport module 3 is disassembled to further observe and sample the sediment on the inner wall of the visualized straight pipe section 14.1 and the curved pipe section 14.2.

[0050] The above description is only a preferred embodiment of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A visualization device for powder generation and transport, characterized in that, The system comprises a gas and powder generation module, a gas pipeline transportation module, and a tail gas treatment and powder collection module connected in sequence. The gas and powder generation module fuses solid-particle powder or powder generated by reaction with the transport gas to form a two-phase flow consisting of gas and solid particles. The two-phase flow is transported over long distances through the gas pipeline transportation module, and the powder settling phenomenon is visualized and observed. Finally, it enters the tail gas treatment and powder collection module to collect the powder in the gas, realize the recycling of solid particles, and reduce environmental pollution. The gas and powder generation module includes a gas-carrying powder transport unit and a powder generation transport unit, which are respectively connected to the inlet of the gas pipeline transport module.

2. The visualization device according to claim 1, characterized in that, The gas-carrying powder transport unit includes a compressed air pump, a powder storage tank, a powder conveying device, and a vacuum generator. The powder storage tank is connected to the powder conveying device, the outlet of the powder conveying device is connected to the inlet of the vacuum generator, the vacuum generator is connected to the compressed air pump, and the outlet of the vacuum generator is connected to the inlet of the gas pipeline transport module.

3. The visualization device according to claim 1, characterized in that, The powder generation and transport unit includes a nitrogen high-pressure cylinder, a primary gas source storage tank, a secondary gas source storage tank, and a reaction gas path device. The primary gas source storage tank is connected to the first gas inlet of the reaction gas path device, and the secondary gas source storage tank is connected to the second gas inlet of the reaction gas path device. The first and second gas inlets are opposite to each other. The nitrogen high-pressure cylinder is connected to the third gas inlet of the reaction gas path device, and the outlet of the reaction gas path device is connected to the inlet of the gas pipeline transport module. The third gas inlet is opposite to the outlet of the reaction gas path device.

4. The visualization device according to claim 3, characterized in that, A mass flow controller is installed on the first gas source storage tank, and a preheating evaporator is installed in the second gas source storage tank, and a mass flow controller is also installed on the second gas source storage tank.

5. The visualization device according to claim 1, characterized in that, The gas pipeline transport module includes a mounting bracket assembly and a transparent pipeline assembly mounted on the mounting bracket assembly via a quick-release connection assembly. The transparent pipeline assembly includes multiple visible straight pipe sections and curved pipes. The multiple visible straight pipe sections are arranged sequentially at intervals, and their ends are connected sequentially via curved pipes to form a long-distance visible transport pipeline. The inlet of the long-distance visible transport pipeline is connected to the outlet of the vacuum generator or the outlet of the reaction gas circuit device. The outlet of the long-distance visible transport pipeline is connected to the inlet of the exhaust gas treatment and powder collection module.

6. The visualization device according to claim 5, characterized in that, The mounting bracket assembly includes two vertically arranged long channel steels and short channel steels fixed at intervals on each long channel steel by T-bolts. The short channel steels arranged on the two long channel steels are located on the same horizontal plane in pairs. The short channel steels located on the same horizontal plane are used to fix the ends of the visible straight pipe section.

7. The visualization device according to claim 5, characterized in that, One of the visualized straight pipe sections can be replaced with a typical structure pipe assembly, which is an orifice plate structure pipe assembly, a valve core structure pipe assembly, or a reducing structure pipe assembly. All of these are installed in the long-distance visualized transport pipeline through the quick-release connection assembly to replace any one of the visualized straight pipe sections.

8. The visualization device according to claim 7, characterized in that, The orifice plate structure pipe assembly includes a transparent straight pipe and an orifice plate arranged radially inside the transparent straight pipe; the valve core structure pipe assembly includes a transparent straight pipe and a valve core arranged inside the transparent straight pipe; the reducing structure pipe assembly includes a transparent straight pipe and a reducing pipe arranged inside the transparent straight pipe, wherein the reducing pipe gradually reduces the diameter of the transparent straight pipe and maintains the reduced diameter.

9. The visualization device according to claim 1, characterized in that, The exhaust gas treatment and powder collection module includes a powder recovery component, a powder filtration component, and a gas collection and evacuation component. The powder recovery component includes four cyclone filters connected in series. The inlet of the first cyclone filter is connected to the outlet of a long-distance visible transport pipeline, and the outlet of the last cyclone filter is connected to the powder filtration component. The powder filtration component uses a filter element made of polytetrafluoroethylene or borosilicate glass fiber. The gas collection and evacuation component includes a collection container and a corrosion-resistant dry vacuum pump that are interconnected by pipelines. The collection container is connected to the powder filtration component.

10. The method of using the visualization device for powder generation and transport as described in any one of claims 1 to 9, characterized in that, Includes the following steps: Step 1: If a gas-carrying powder transport unit is selected, the inlet of the powder generation and transport unit and the long-distance visual transport pipeline are sealed with a blind flange. Step 2: Start the corrosion-resistant dry vacuum pump to evacuate the entire device to a certain negative pressure state, close the inlet of the long-distance visual transport pipeline, observe the change of the pressure gauge value, and confirm that the system is airtight. Step 3: If the gas carries solid powder of different particle sizes, turn on the compressed air pump, and the compressed air enters the vacuum generator. A negative pressure is generated at the suction port of the vacuum generator. At the same time, solid powder of different particle sizes is poured into the powder storage tank. The powder conveying device is started. The powder is quantitatively and stably drawn out from the powder storage tank and sent into the vacuum generator. Under the action of high-speed airflow, the powder is instantly atomized to form a uniform gas-solid two-phase flow, which is then blown into a long-distance visible transport pipeline. To generate powder from different gas reactions: Activate the preheating evaporator in the dual gas source tank, turn on the high-pressure nitrogen cylinder to establish a stable nitrogen flow field, and then simultaneously turn on both the first and second gas source tanks; the two reacting gases are ejected through the nozzles of the reaction gas path device, meet and react to generate solid nanoparticle powder, and the nitrogen flow carries the powder to form a gas-solid two-phase flow, which is then transported into a long-distance visible transport pipeline; Step 4: The gas-solid two-phase flow formed in Step 3 flows stably in a long-distance visualized transport pipeline. The transport status and sedimentation of powder particles in the transported gas-solid two-phase flow in the visualized straight pipe section and curved pipe are observed and recorded to obtain the significance of the simulation experiment under different scenarios. Step 5, Visual observation and recording of typical structural pipe fittings: The experiment can be stopped accordingly for different experimental scenarios, and one of the visualized straight pipe sections can be replaced by the orifice plate structure pipe assembly, valve core structure pipe assembly or reducing structure pipe assembly. Steps 1-3 are repeated to visualize and record the powder particle transport and sedimentation at the typical structural pipe assembly, and obtain the simulation experimental results at the typical structural pipe fittings. Step 6: The gas-solid two-phase flow finally enters the tail gas treatment and powder collection module. Part of the powder is collected by the powder recovery component, and another part of the powder is captured by the filter element at the powder filtration component. The remaining impurity gas is collected in the collection container. Finally, the clean gas is discharged by the corrosion-resistant dry vacuum pump. After the experiment, the relevant devices in the gas and powder generation module and the tail gas treatment and collection module are turned off in sequence to complete the experimental operation. Step 7: After the experiment is completed and the entire device is stable, the powder recovery component and powder filtration component will collect and capture the powder and weigh it or perform subsequent analysis. At the same time, the gas pipeline transport module will be disassembled to further observe and sample the sediment on the inner wall of the visualized straight pipe section and the curved pipe section.

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