A device for testing gas-solid mixing and flow characteristics in a pressurized gas pipeline

Abstract

The present invention provides a device for testing gas-solid mixing and flow characteristics in a pressurized gas pipeline, which relates to an industrial pipeline monitoring device, including a pressurized pipeline main body, the experimental section and the particle adding section are combined to form an airflow loop, and the particle adding device is fixedly installed at the flange assembly port by fastening bolts; the air inlet pipe guides the airflow in the pipeline into the U-shaped mixing tube, and in the process of synchronous rotation with the stirring fan blade, the particles in the sealed particle storage box are spread in the U-shaped mixing tube to complete the gas-solid mixing. The present invention is designed according to the particularity of the pressurized pipeline. By guiding the airflow inside the pressurized pipeline into the particle adding device, the airflow of the pipeline itself is used as power to perform the gas-solid mixing operation. This design no longer requires an external pressurized air pump, thereby greatly reducing the cost of the particle adding process, and the particle adding rate can be adaptively adjusted according to the gas flow rate in the pipeline, fully ensuring the uniformity and continuity of the particle distribution.

Description

Technical Field

[0001] The invention relates to an industrial pipeline monitoring device, in particular to a device for testing gas-solid mixing and flow characteristics in a pressurized gas pipeline. Background Art

[0002] In many industrial production areas, such as petrochemicals, water supply and drainage, and heating, pipelines are critical infrastructure for transporting various fluids. These pipeline systems typically operate under a certain pressure to ensure that fluids can be efficiently transported from one location to another.

[0003] Accurately measuring the fluidity of pressurized pipelines has been a challenging problem. Traditional detection methods, such as direct measurement using flow sensors, cannot directly reflect the movement path of the fluid within the pipeline. To this end, researchers have begun to consider indirectly assessing the fluid's fluidity by adding specific solid particulate matter to the pipeline. Solid particles, as readily available substances with relatively stable physical properties, are being considered as tracers or functional agents for addition to pressurized pipelines. This is because the movement and distribution of particles within the pipeline as tracers can reflect the flow state of the fluid to a certain extent, thereby facilitating the acquisition of specific parameters such as flow velocity, flow rate, frictional resistance, and local resistance within the pipeline.

[0004] To this end, a multiphase erosion and corrosion coupling damage pipeline simulation experimental testing system and method with the publication number "CN119164870A" in the prior art includes a screw pump, a pressure measurement module, a high-pressure rubber expansion joint, a gas release module, a check valve, a special feeding module, a temperature control measurement module, a wall shear force measurement chamber, a fluid acceleration module, a buffer tank, a pipeline boosting module, a temperature sensor, an electrical control cabinet and a copper tube coil cooler arranged on the circulation pipeline; the device solves the problem of high sulfur, high chlorine and high acid harsh environment in petrochemical production equipment, and the difficulty in testing the gas-liquid / gas-liquid-solid multiphase erosion and corrosion coupling damage law and predicting the damage rate. By designing special feeding, pressurization, acceleration, constant temperature, anti-corrosion, anti-wear, anti-vibration and other structures, as well as precise control systems of temperature, flow, concentration and pressure, long-term stable operation and precise measurement of multiphase erosion and corrosion coupling damage are achieved, effectively supporting the safety assessment and risk prevention and control of complex flow-induced damage in petrochemical production equipment.

[0005] However, the above-mentioned device still has obvious defects during use: the above-mentioned device installs a particle adding device on the loop pipe to add particles to the inside of the pipe. This particle adding method cannot be used in a pressurized pipe. This is because there is a large pressure inside the pressurized pipe, and the pressure inside the pipe will hinder the normal progress of the particle adding process. In order to solve the above problems, the prior art further discloses a solution of using a pressurized air pump to pump a gas-solid mixed fluid into a pressurized pipe. Although this solution solves the problem of the inability to add particles normally, it requires the introduction of high-pressure gas, thereby increasing the cost of particle addition. In addition, the high-pressure gas is affected by the pressure in the pipe and its own air pressure during the release process, which may lead to inconsistent particle addition rates, thereby affecting the uniformity and continuity of the gas-solid mixing. Summary of the Invention

[0006] The purpose of the present invention is to provide a device for testing gas-solid mixing and flow characteristics in a pressurized gas pipeline to solve the problems raised in the above background technology.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A device for testing gas-solid mixing and flow characteristics in a pressurized gas pipeline includes a pressurized pipeline body, the pressurized pipeline body consisting of a test section and a particle addition section, the test section and the particle addition section forming an airflow loop, a flange assembly opening being formed on the pipeline of the particle addition section, and a particle addition device being fixedly mounted at the flange assembly opening by fastening bolts;

[0009] The particle adding device includes a box body, a U-shaped mixing tube and a sealed particle storage box are fixedly installed in the box body, an air inlet pipe and an air outlet pipe are lifted and lowered in the box body, the air inlet pipe is connected to the air inlet end of the U-shaped mixing tube through a telescopic bellows, and the air outlet pipe is connected to the air outlet end of the U-shaped mixing tube through a telescopic bellows. Telescopic holes for the air inlet pipe and the air outlet pipe to be raised and lowered are provided at the box body and the flange assembly port. The air inlet pipe and the air outlet pipe are retracted upward in the daily mode and the telescopic holes are blocked. The air inlet pipe and the air outlet pipe are extended downward in the particle adding mode and enter the particle Inside the tube body of the adding section, the air inlet pipe guides the airflow in the pipeline into the U-shaped mixing tube in the particle adding mode. A stirring fan blade is fixedly installed in the U-shaped mixing tube in a fixed-axis rotating manner. The stirring fan blade is coaxially fixedly connected to the distribution turntable. The stirring fan blade rotates under the impetus of the airflow in the U-shaped mixing tube. The distribution turntable is connected to the sealed particle storage box provided in the box body, and in the process of synchronous rotation with the stirring fan blade, the particles in the sealed particle storage box are distributed in the U-shaped mixing tube, thereby completing gas-solid mixing. The fluid after gas-solid mixing is returned to the tube body of the particle adding section through the air outlet pipe;

[0010] The stirring blades are arranged at the rear end of the distribution turntable in the airflow direction, and the distribution turntable is provided with particle ejection holes in an annular array. The distribution turntable is provided with distribution compartments corresponding to the number of the particle ejection holes. Adjacent distribution compartments are separated by material partition baffles. The particles entering the distribution turntable are ejected through the particle ejection holes under the action of centrifugal force and mixed with the airflow. The stirring blades further mix and stir the gas-solid fluid.

[0011] CCD cameras are also provided at various locations in the experimental section, and the flow path of the fluid after the gas-solid mixture is photographed and detected by the CCD cameras.

[0012] Preferably, the air inlet pipe and the air outlet pipe are both fixedly connected to the same lifting plate, and the lifting movement of the lifting plate is arranged in a lifting slot opened in the box body. The lifting plate is also fixedly connected to the telescopic arm of the electric hydraulic telescopic cylinder, and the electric hydraulic telescopic cylinder is fixedly installed on the side wall of the box body. The air inlet pipe and the air outlet pipe are synchronously driven to perform lifting and lowering movements through the telescopic movement of the telescopic arm of the electric hydraulic telescopic cylinder.

[0013] Preferably, an axial connecting rod is fixedly installed at the axis of the stirring blade, and the axial connecting rod extends to the outside of the U-shaped mixing tube through a sealed bearing installed on the U-shaped mixing tube at one end away from the stirring blade. A driving pulley is also fixedly installed at the end of the axial connecting rod outside the U-shaped mixing tube, and a driven pulley is fixedly installed on the side of the sealed particle storage box. The driving pulley is connected to the driven pulley through a pulley belt, and the driven pulley is also fixedly connected to the unloading turntable through a connecting rod, and the unloading turntable is fixedly rotatably arranged at the unloading port opened at the bottom of the sealed particle storage box.

[0014] Preferably, a drop pipe is fixedly installed at the bottom of the discharge port, and the other end of the drop pipe passes through the U-shaped mixing pipe and is fixedly connected to a bearing ring arranged at the axis center of the distribution turntable.

[0015] Preferably, the pipe body of the particle adding section is further equipped with a pressure balancing pipe connected to the sealed particle storage box, and an opening and closing valve is also installed on the pressure balancing pipe.

[0016] Preferably, a feeding port is provided on the upper box body of the sealed particle storage box, and a sealing cover is installed on the feeding port.

[0017] Preferably, the sealed particle storage box is a glass container, and a glass observation window is provided on the side of the box body, through which the sealed particle storage box can be observed.

[0018] Preferably, the inner wall of the tube body of the particle adding section is further provided with an electromagnet, which, when energized, magnetically adsorbs and fixes the air inlet pipe and the air outlet pipe resting against the inner wall of the tube body at the bottom of the particle adding section.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The present invention is designed based on the particularity of pressurized pipelines. By guiding the airflow inside the pressurized pipeline into the particle adding device, the airflow in the pipeline itself is used as power to perform gas-solid mixing operations. This design no longer requires an external pressurized air pump, thereby greatly reducing the cost of the particle adding process. The particle adding rate can be adaptively adjusted according to the gas flow rate in the pipeline, fully ensuring the uniformity of particle distribution. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall and partially enlarged structure of the particle adding device of the present invention;

[0022] Figure 2 This is a gas flow diagram of the particle adding device of the present invention in the particle adding state;

[0023] Figure 3 This is a schematic structural diagram of the cloth turntable of the present invention;

[0024] Figure 4 This is a schematic diagram of the installation structure of the particle adding device of the present invention;

[0025] Figure 5 Attached to the instruction manual Figure 1 Schematic diagram of the locally enlarged structure of area A in the middle.

[0026] In the figure: 1 experimental section, 2 particle adding section, 3 flange assembly port, 4 fastening bolts, 5 box body, 6 air inlet pipe, 7 air outlet pipe, 8 telescopic bellows, 9 U-shaped mixing pipe, 10 telescopic hole, 11 stirring blade, 12 distribution turntable, 13 particle ejection hole, 14 distribution compartment, 15 material baffle, 16 lifting plate, 17 electric hydraulic telescopic cylinder, 18 axial connecting rod, 19 sealed bearing, 20 driving pulley, 21 pulley, 22 driven pulley, 23 connecting rod, 24 unloading turntable, 25 sealed particle storage box, 26 unloading port, 27 unloading pipe, 28 bearing ring, 29 pressure balance pipe, 30 opening and closing valve, 31 feeding port, 32 sealing cover, 33 glass observation window, 34 electromagnet, 35 lifting trough. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] See also Figure 1-5, the present invention provides a technical solution:

[0029] Example 1:

[0030] A device for testing gas-solid mixing and flow characteristics in a pressurized gas pipeline includes a pressurized pipeline body, the pressurized pipeline body consisting of an experimental section 1 and a particle addition section 2, the experimental section 1 and the particle addition section 2 forming an airflow loop, a flange assembly port 3 being formed on the pipeline of the particle addition section 2, and a particle addition device being fixedly mounted at the flange assembly port 3 by a fastening bolt 4;

[0031] The particle adding device includes a box body 5, in which a U-shaped mixing tube 9 and a sealed particle storage box 25 are fixedly installed. An air inlet pipe 6 and an air outlet pipe 7 are provided in a lifting manner in the box body 5. The air inlet pipe 6 is connected to the air inlet end of the U-shaped mixing tube 9 through a telescopic bellows 8, and the air outlet pipe 7 is connected to the air outlet end of the U-shaped mixing tube 9 through a telescopic bellows 8. A telescopic hole 10 for the air inlet pipe 6 and the air outlet pipe 7 to be raised and lowered is provided at the box body 5 and the flange assembly port 3. The air inlet pipe 6 and the air outlet pipe 7 are retracted upward in the daily mode and the telescopic hole 10 is blocked. The air inlet pipe 6 and the air outlet pipe 7 are extended downward in the particle adding mode and enter the particle Inside the tube body of the adding section 2, the air inlet pipe 6 guides the airflow in the pipeline to the U-shaped mixing tube 9 in the particle adding mode. A stirring blade 11 is fixedly installed in the U-shaped mixing tube 9. The stirring blade 11 is coaxially fixedly connected to the distribution turntable 12. The stirring blade 11 rotates under the impetus of the airflow in the U-shaped mixing tube 9. The distribution turntable 12 is connected to the sealed particle storage box 25 provided in the box body 5. In the process of synchronous rotation with the stirring blade 11, the particles in the sealed particle storage box 25 are dispersed in the U-shaped mixing tube 9 to complete gas-solid mixing. The fluid after gas-solid mixing is returned to the tube body of the particle adding section 2 through the air outlet pipe 7;

[0032] The stirring blades 11 are arranged at the rear end of the distribution turntable 12 in the airflow direction. The distribution turntable 12 is provided with a ring array of particle ejection holes 13. The distribution turntable 12 is provided with distribution compartments 14 corresponding to the number of the particle ejection holes 13. Adjacent distribution compartments 14 are separated by material partition baffles 15. The particles entering the distribution turntable 12 are ejected through the particle ejection holes 13 under the action of centrifugal force and mixed with the airflow. The stirring blades 11 further mix and stir the gas-solid fluid.

[0033] CCD cameras are also installed at various locations in the experimental section 1, and the flow path of the fluid after gas-solid mixing is photographed and detected by the CCD cameras.

[0034] In this embodiment, the main body of the pressurized pipeline is composed of an experimental section 1 and a particle adding section 2, and the experimental section 1 and the particle adding section 2 are combined to form an air flow loop, which makes the experimental section 1 and the particle adding section 2 both part of the pressurized test pipeline, wherein a flange assembly port 3 is opened on the pipeline of the particle adding section 2, and the installation of the particle adding device is completed through the flange assembly port 3. The beneficial effect of such a setting is that, compared with the particle adding method in the prior art, the modification of the main body of the pressurized pipeline in this embodiment is minimal, and the air inlet pipe 6 and the air outlet pipe 7 provided in the particle adding device are retracted in the normal state, so that the air flow in the pressurized pipeline is not affected by the particle adding device. Please refer to the attached manual for details. Figure 1 However, in the particle adding state, the air inlet pipe 6 and the air outlet pipe 7 extend downward and enter the pipe body of the particle adding section 2. The air inlet pipe 6 guides the airflow in the pipe to the U-shaped mixing pipe 9 in the particle adding mode. The advantage of this arrangement is that the particle adding process can be completed without the need to install a pressurized air pump. Furthermore, in this embodiment, the airflow is introduced into the U-shaped mixing pipe 9, and the airflow is further used to drive the stirring blade 11 to rotate. The stirring blade 11 is coaxially fixedly connected to the material distribution turntable 12, thereby driving the material distribution turntable 12 to rotate. The turntable 12 is connected to the sealed particle storage box 25. A feeding port 31 is provided on the box body 5 at the upper part of the sealed particle storage box 25. A sealing cover 32 is installed on the feeding port 31, so that the particles in the sealed particle storage box 25 can be added and the airtightness can be ensured. Therefore, the particles stored in the sealed particle storage box 25 enter the U-shaped mixing tube 9 through the distribution turntable 12 and are thrown out during the rotation of the distribution turntable 12, thereby completing the gas-solid mixing operation. Furthermore, in order to ensure the uniformity of the gas-solid mixing, the distribution turntable 1 2 is provided with particle ejection holes 13 in a circular array, and a distribution compartment 14 is provided inside. After falling into the distribution turntable 12, the particles are evenly separated in the distribution compartment 14 due to the rotation of the distribution turntable 12 and are ejected from the particle ejection holes 13 as the distribution compartment 14 rotates. The stirring blades 11 are provided at the rear end of the distribution turntable 12 in the airflow direction. On the one hand, they provide power for the centrifugal ejection of the particles, and on the other hand, they stir the ejected particles with the airflow, thereby promoting more uniform mixing. In summary, the above-mentioned device greatly reduces the cost of the particle addition process and fully ensures the uniformity of particle distribution. The particle addition section 2 of this embodiment is mainly used to connect to experimental pipelines in the laboratory to detect the fluidity of fluids in pressurized pipelines. It can also be used to connect to industrial pipelines in the industrial production field, so that it can add different particulate materials according to different needs. The added particulate materials include but are not limited to tracer ions, quartz sand particles, nano-composite drag reducer particles, desiccant particles or a combination thereof. The specific usage is selected according to the technical effect to be achieved.

[0035] Example 2:

[0036] The air inlet pipe 6 and the air outlet pipe 7 are both fixedly connected to the same lifting plate 16. The lifting plate 16 is movable in the lifting slot 35 provided in the box body 5. The lifting plate 16 is also fixedly connected to the telescopic arm of the electric hydraulic telescopic cylinder 17. The electric hydraulic telescopic cylinder 17 is fixedly mounted on the side wall of the box body 5. The telescopic movement of the telescopic arm of the electric hydraulic telescopic cylinder 17 synchronously drives the air inlet pipe 6 and the air outlet pipe 7 to move up and down.

[0037] In this embodiment, a mechanism for driving the air inlet pipe 6 and the air outlet pipe 7 to perform lifting movements is further disclosed. The air inlet pipe 6 and the air outlet pipe 7 are driven to perform lifting movements synchronously by the lifting and lowering of the electric hydraulic telescopic cylinder 17, and the electric hydraulic telescopic cylinder 17 is powered by an external power supply.

[0038] Example 3:

[0039] An axial connecting rod 18 is also fixedly installed at the axis of the stirring blade 11. The end of the axial connecting rod 18 away from the stirring blade 11 passes through the sealed bearing 19 installed on the U-shaped mixing tube 9 and extends to the outside of the U-shaped mixing tube 9. A driving pulley 20 is also fixedly installed at the end of the axial connecting rod 18 outside the U-shaped mixing tube 9. A driven pulley 22 is fixedly installed on the side of the sealed particle storage box 25. The driving pulley 20 is connected to the driven pulley 22 through a pulley belt 21. The driven pulley 22 is also fixedly connected to the unloading turntable 24 through a connecting rod 23. The unloading turntable 24 is fixedly rotatably arranged at the unloading port 26 opened at the bottom of the sealed particle storage box 25.

[0040] Preferably, a drop pipe 27 is fixedly installed at the bottom of the discharge port 26 , and the other end of the drop pipe 27 passes through the U-shaped mixing pipe 9 and is fixedly connected to a bearing ring 28 provided at the axis of the distribution turntable 12 .

[0041] In this embodiment, a discharge turntable 24 is further provided, which can prevent the particles from densely entering the U-shaped mixing tube 9 under the action of gravity, thereby affecting the uniformity of the particle addition process. For this purpose, an axial connecting rod 18 is fixedly installed at the axis of the stirring blade 11, and a driving pulley 20 is installed on the axial connecting rod 18. The driving pulley 20 is connected to the driven pulley 22 through a pulley belt 21, and the driven pulley 22 is also fixedly connected to the discharge turntable 24 through a connecting rod 23. The advantage of this arrangement is that the particles in the sealed particle storage box 25 can be quantitatively entered into the distribution turntable 12, and the rotation speed of the discharge turntable 24 depends on the stirring blade 11, and the rotation speed of the stirring blade 11 is determined by the flow velocity of the pressurized pipe body flowing through the stirring blade 11, which leads to a positive correlation between the rotation speed of the discharge turntable 24 and the flow velocity inside the pipe, so that when the flow velocity in the pipe is slow, the release speed of the particles is simultaneously slowed down. This design can effectively ensure the unit falling velocity of the particles, and thus ensure the uniformity of particle addition. In summary, the stirring blade 11 not only serves as a centrifugal ejection mechanism for the particles in the feeding turntable 12 and a mixing mechanism for the particles and the gas in the pipe, but can also perform quantitative release of particles according to the gas flow velocity in the pipe, so that the component produces multiple technical effects.

[0042] Example 4:

[0043] The pipe body of the particle adding section 2 is also equipped with a pressure balancing pipe 29 that is connected to the sealed particle storage box 25 , and an opening and closing valve 30 is also installed on the pressure balancing pipe 29 .

[0044] In this embodiment, in order to further ensure that the air pressure in the pipeline is balanced with the air pressure in the sealed particle storage box 25, the pipe body of the particle adding section 2 is also equipped with a pressure balance pipe 29 that is connected to the sealed particle storage box 25. The purpose of this setting is to fully ensure that the particles in the sealed particle storage box 25 can smoothly enter the U-shaped mixing tube 9, and an opening and closing valve 30 is also installed on the pressure balance pipe 29, so that the pressure balance pipe 29 is in a closed state under normal conditions.

[0045] Embodiment 5:

[0046] The sealed particle storage box 25 is a glass container, and a glass observation window 33 is provided on the side of the box body 5 , through which the sealed particle storage box 25 can be observed.

[0047] In this embodiment, the sealed particle storage box 25 is set as a glass container so that the interior thereof can be observed, and a volume scale can be further installed on the glass container so that a fixed volume of particles can be added to the sealed particle storage box 25 before the particles are added. A glass observation window 33 is also provided on the side of the box body 5, so that the condition inside the sealed particle storage box 25 can be observed conveniently during the particle addition process.

[0048] Example 6:

[0049] The inner wall of the tube body of the particle adding section 2 is further provided with an electromagnet 34 , which, when energized, magnetically adsorbs and fixes the air inlet pipe 6 and the air outlet pipe 7 resting against the inner wall of the tube body at the bottom of the particle adding section 2 .

[0050] In order to further overcome the influence of the airflow in the pipeline on the air inlet pipe 6 and the air outlet pipe 7, an electromagnet 34 is also provided on the inner wall of the tube body of the particle adding section 2. The air inlet pipe 6 and the air outlet pipe 7 are adsorbed by the magnetic adsorption force generated by the electromagnet 34, thereby ensuring the stability of their connection in the particle adding section 2. To this end, the bottom of the air inlet pipe 6 and the air outlet pipe 7 is provided with a magnetic adsorption material that cooperates with the electromagnet 34.

[0051] Working principle: The particle adding device is installed on the particle adding section 2 through the flange assembly port 3 opened on the particle adding section 2. In the normal mode, the electric hydraulic telescopic cylinder 17 drives the lifting plate 16 to pull the air inlet pipe 6 and the air outlet pipe 7 upward. At this time, the lower ends of the air inlet pipe 6 and the air outlet pipe 7 block the box 5 and the telescopic hole 10 at the flange assembly port 3. At this time, the air flow in the particle adding section 2 follows the instructions attached to the manual. Figure 1 When particles need to be added to the particle adding section 2, the electric hydraulic telescopic cylinder 17 pushes the lifting plate 16 down. At this time, the air inlet pipe 6 and the air outlet pipe 7 extend downward to the particle adding section 2. At this time, the air inlet pipe 6 and the air outlet pipe 7 block the two ends of the particle adding section 2. The gas changes its direction of travel and flows along the air inlet pipe 6, the telescopic bellows 8 arranged on the right, the U-shaped mixing pipe 9, the telescopic bellows 8 arranged on the left, and finally flows back to the particle adding section 2 through the air outlet pipe 7, thereby forming an air flow loop. Refer to the attached manual for details. Figure 2, because the gas in the particle adding section 2 passes through the U-shaped mixing tube 9, a stirring blade 11 is installed in the fixed axis rotation type. When the air flow passes through the stirring blade, it will push it to rotate on the fixed axis, and the stirring blade 11 is coaxially fixedly connected to the distribution turntable 12. Therefore, the rotation of the stirring blade 11 will drive the distribution turntable 12 to rotate synchronously. The distribution turntable 12 is also connected to the blanking pipe 27 through the bearing ring 28. The blanking pipe 27 is fixedly installed on the U-shaped mixing tube 9. At the same time, the rotation of the stirring blade 11 also drives the active pulley 20 to rotate. The rotation of the active pulley 20 drives the driven pulley 22 and the blanking turntable 24 to rotate. The blanking turntable 24 rotates to seal the particle storage box 25. The particles enter the distribution turntable 12 through the drop pipe 27. The distribution turntable 12 is provided with distribution compartments 14 corresponding to the number of particle throwing holes 13. The particles falling into the drop pipe 27 enter the distribution compartments 14 of the distribution turntable 12 under the action of gravity. Since the distribution turntable 12 rotates along with the stirring blades 11 on a fixed axis, the particles in the distribution compartments 14 are thrown out through the particle throwing holes 13 under the action of centrifugal force during the rotation of the distribution turntable 12. The thrown particles are further stirred and mixed with the gas in the U-shaped mixing tube 9 through the rotation of the stirring blades 11. The stirred and mixed gas-solid mixed fluid is returned to the particle adding section 2 through the outlet pipe 7.

[0052] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A device for testing gas-solid mixing and flow characteristics in a pressurized gas pipeline, comprising a pressurized pipeline body, the pressurized pipeline body consisting of a test section and a particle addition section, characterized in that: The experimental section and the particle addition section are combined to form an airflow loop, a flange assembly port is opened on the pipeline of the particle addition section, and a particle addition device is fixedly installed at the flange assembly port by fastening bolts; The particle adding device includes a box body, a U-shaped mixing tube and a sealed particle storage box are fixedly installed in the box body, an air inlet pipe and an air outlet pipe are lifted and lowered in the box body, the air inlet pipe is connected to the air inlet end of the U-shaped mixing tube through a telescopic bellows, and the air outlet pipe is connected to the air outlet end of the U-shaped mixing tube through a telescopic bellows. Telescopic holes for the air inlet pipe and the air outlet pipe to be raised and lowered are provided at the box body and the flange assembly port. The air inlet pipe and the air outlet pipe are retracted upward in the daily mode and the telescopic holes are blocked. The air inlet pipe and the air outlet pipe are extended downward in the particle adding mode and enter the particle Inside the tube body of the adding section, the air inlet pipe guides the airflow in the pipeline into the U-shaped mixing tube in the particle adding mode. A stirring fan blade is fixedly installed in the U-shaped mixing tube in a fixed-axis rotating manner. The stirring fan blade is coaxially fixedly connected to the distribution turntable. The stirring fan blade rotates under the impetus of the airflow in the U-shaped mixing tube. The distribution turntable is connected to the sealed particle storage box provided in the box body, and in the process of synchronous rotation with the stirring fan blade, the particles in the sealed particle storage box are distributed in the U-shaped mixing tube, thereby completing gas-solid mixing. The fluid after gas-solid mixing is returned to the tube body of the particle adding section through the air outlet pipe; The stirring blades are arranged at the rear end of the distribution turntable in the airflow direction, and the distribution turntable is provided with particle ejection holes in an annular array. The distribution turntable is provided with distribution compartments corresponding to the number of the particle ejection holes. Adjacent distribution compartments are separated by material partition baffles. The particles entering the distribution turntable are ejected through the particle ejection holes under the action of centrifugal force and mixed with the airflow. The stirring blades further mix and stir the gas-solid fluid. CCD cameras are also installed at various locations in the experimental section to take pictures of the flow path of the fluid after the gas-solid mixture. The axis of the stirring blade is also fixedly installed with an axial connecting rod, and the end of the axial connecting rod away from the stirring blade passes through the sealed bearing installed on the U-shaped mixing tube and extends to the outside of the U-shaped mixing tube. The end of the axial connecting rod outside the U-shaped mixing tube is also fixedly installed with a driving pulley, and a driven pulley is fixedly rotatably installed on the side of the sealed particle storage box. The driving pulley is connected to the driven pulley through a pulley belt, and the driven pulley is also fixedly connected to the unloading turntable through a connecting rod. The unloading turntable is fixedly rotatably arranged at the unloading port opened at the bottom of the sealed particle storage box.

2. The device for testing gas-solid mixing and flow characteristics in a pressurized gas pipeline according to claim 1, characterized in that: The air inlet pipe and the air outlet pipe are both fixedly connected to the same lifting plate. The lifting movement of the lifting plate is arranged in a lifting slot opened in the box. The lifting plate is also fixedly connected to the telescopic arm of the electric hydraulic telescopic cylinder. The electric hydraulic telescopic cylinder is fixedly installed on the side wall of the box. The air inlet pipe and the air outlet pipe are synchronously driven to move up and down through the telescopic movement of the telescopic arm of the electric hydraulic telescopic cylinder.

3. The device for testing gas-solid mixing and flow characteristics in a pressurized gas pipeline according to claim 2, characterized in that: A drop pipe is fixedly installed at the bottom of the discharge port, and the other end of the drop pipe passes through the U-shaped mixing pipe and is fixedly connected to a bearing ring arranged at the axis center of the distribution turntable.

4. The device for testing gas-solid mixing and flow characteristics in a pressurized gas pipeline according to claim 3, characterized in that: The pipe body of the particle adding section is also equipped with a pressure balancing pipe that is in communication with the sealed particle storage box, and an opening and closing valve is also installed on the pressure balancing pipe.

5. The device for testing gas-solid mixing and flow characteristics in a pressurized gas pipeline according to claim 4, characterized in that: A feeding port is provided on the box body at the upper part of the sealed particle storage box, and a sealing cover is installed on the feeding port.

6. The device for testing gas-solid mixing and flow characteristics in a pressurized gas pipeline according to claim 5, characterized in that: The sealed particle storage box is a glass container, and a glass observation window is provided on the side of the box body, through which the sealed particle storage box can be observed.

7. The device for testing gas-solid mixing and flow characteristics in a pressurized gas pipeline according to claim 6, characterized in that: The inner wall of the tube body of the particle adding section is further provided with an electromagnet, which, when energized, magnetically adsorbs and fixes the air inlet pipe and the air outlet pipe resting against the inner wall of the tube body at the bottom of the particle adding section.

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