Gas-solid mixing and flow characteristic testing device in pressurized gas pipeline

Abstract

The invention provides a device for testing gas-solid mixing and flow characteristics in an under-pressure gas pipeline, and relates to an industrial pipeline monitoring device, the device comprises an under-pressure pipeline main body, an experiment section and a particle adding section are combined to form a gas flow loop, and a flange assembly port is fixedly provided with a particle adding device through a fastening bolt; the gas inlet pipe guides gas flow in the pipeline into the U-shaped mixing pipe, and particles in the sealed particle storage box are distributed in the U-shaped mixing pipe in the synchronous rotation process of the gas inlet pipe and the stirring fan blades, so that gas-solid mixing is completed. The airflow in the pipeline with pressure is guided into the particle adding device, the airflow of the pipeline is used as power for gas-solid mixing operation, an external pressurizing air pump is not needed any more, and therefore the cost of the particle adding process is greatly reduced, the particle adding speed can be adjusted in a self-adaptive mode according to the flow speed of gas in the pipeline, and the particle adding efficiency is improved. And the distribution uniformity and continuity of the particles are fully ensured.

Description

Technical Field

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

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

[0003] At present, accurately detecting the fluidity of fluids in pressurized pipelines has always been a challenging problem. Traditional detection methods, such as direct measurement based on flow sensors, cannot intuitively reflect the movement path of the fluid in the pipeline. For this reason, researchers began to think about indirectly evaluating the fluidity of the fluid by adding specific solid particulate matter to the pipeline. Solid particles, as a substance that is easy to obtain and has relatively stable physical properties, are considered to be added to pressurized pipelines as tracers or functional agents, because the movement trajectory and distribution of particles as tracers in the pipeline can reflect the flow state of the fluid to a certain extent, which is conducive to obtaining specific parameters such as flow velocity, flow rate, friction resistance and local resistance in the pipeline.

[0004] To this end, a multiphase erosion-corrosion coupling damage pipeline simulation experimental test system and method with 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 booster module, a temperature sensor, an electric control cabinet and a copper tube coil cooler arranged on the circulation pipeline; the device solves the problem that the gas-liquid / gas-liquid-solid multiphase erosion and corrosion coupling damage law and the damage rate prediction are difficult to test in the harsh environment of high sulfur, high chlorine and high acid in petrochemical production equipment. By designing special feeding, pressurization, acceleration, constant temperature, anti-corrosion, anti-wear, anti-vibration and other structures, as well as temperature, flow, concentration and pressure precise control systems, 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 pipeline to add particles to the inside of the pipeline. This particle adding method cannot be used in a pressurized pipeline. This is because there is a large pressure inside the pressurized pipeline, and the pressure inside the pipeline 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 pipeline. 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 adding. 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 adding 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-mentioned background technology.

[0007] To achieve the above object, the present invention provides the following technical solutions: 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 adding section, the test section and the particle adding section are combined to form an airflow loop, a flange assembly port is provided on the pipeline of the particle adding section, and a particle adding device is fixedly installed at the flange assembly port by fastening bolts; The particle adding device comprises 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 with the air inlet end of the U-shaped mixing tube through a telescopic bellows, and the air outlet pipe is connected with the air outlet end of the U-shaped mixing tube through a telescopic bellows, and telescopic holes for lifting and lowering the air inlet pipe and the air outlet pipe are penetrated at the box body and the flange assembly port, the air inlet pipe and the air outlet pipe are contracted upward in the daily mode and the telescopic holes are blocked, and the air inlet pipe and the air outlet pipe are extended downward in the particle adding mode and enter the particle Inside the pipe body of the adding section, the air inlet pipe guides the airflow in the pipe to the U-shaped mixing tube in the particle adding mode, and a stirring blade is installed in the U-shaped mixing tube in a fixed-axis rotating manner. The stirring blade is coaxially fixedly connected with the material distribution turntable, and the stirring blade rotates under the impetus of the airflow in the U-shaped mixing tube. The material 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 blade, the particles in the sealed particle storage box are spread in the U-shaped mixing tube to complete gas-solid mixing, and the gas-solid mixed fluid is returned to the pipe 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. 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 provided at various locations of the experimental section, and the flow path of the fluid after the gas-solid mixture is photographed and detected by the CCD cameras.

[0008] 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 movement through the telescopic movement of the telescopic arm of the electric hydraulic telescopic cylinder.

[0009] 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 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. The unloading turntable is fixedly rotatably arranged at the unloading port opened at the bottom of the sealed particle storage box.

[0010] Preferably, a material dropping pipe is fixedly installed at the bottom of the material dropping port, and the other end of the material dropping pipe passes through the U-shaped mixing pipe and is fixedly connected to a bearing ring arranged at the axis center of the material distribution turntable.

[0011] Preferably, the pipe body of the particle adding section is also equipped with a pressure balance pipe connected to the sealed particle storage box, and an opening and closing valve is also installed on the pressure balance pipe.

[0012] Preferably, 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.

[0013] 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.

[0014] Preferably, an electromagnet is further provided on the inner wall of the tube body of the particle adding section, and when powered on, the electromagnet magnetically adsorbs and fixes the air inlet pipe and the air outlet pipe against the inner wall of the tube body at the bottom of the particle adding section.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention is designed based on the particularity of pressurized pipelines. The airflow inside the pressurized pipeline is guided into the particle adding device, and 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

[0016] Figure 1 It is a schematic diagram of the overall and partial enlarged structure of the particle adding device of the present invention; Figure 2 A gas flow diagram of the particle adding device of the present invention in a particle adding state; Figure 3 It is a schematic diagram of the structure of the cloth turntable of the present invention; Figure 4 This is a schematic diagram of the installation structure of the particle adding device of the present invention; Figure 5 Attached to the instruction manual Figure 1 Schematic diagram of the local enlarged structure of area A in the middle.

[0017] 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 fan blade, 12 material distribution turntable, 13 particle throwing hole, 14 material distribution compartment, 15 material partition baffle, 16 lifting plate, 17 electric hydraulic telescopic cylinder, 18 axial connecting rod, 19 sealed bearing, 20 driving pulley, 21 belt, 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 slot. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0019] See also Figure 1-5 , the present invention provides a technical solution: Embodiment 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 an experimental section 1 and a particle adding section 2, the experimental section 1 and the particle adding section 2 are combined to form an airflow loop, a flange assembly port 3 is opened on the pipeline of the particle adding section 2, and a particle adding device is fixedly installed at the flange assembly port 3 by a fastening bolt 4; The particle adding device comprises 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 with the air inlet end of the U-shaped mixing tube 9 through a telescopic bellows 8, and the air outlet pipe 7 is connected with the air outlet end of the U-shaped mixing tube 9 through a telescopic bellows 8, and a telescopic hole 10 for the air inlet pipe 6 and the air outlet pipe 7 to be lifted and lowered is provided through 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, and 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 installed in the U-shaped mixing tube 9 in a fixed-axis rotating manner. The stirring blade 11 is coaxially fixedly connected with the material distribution turntable 12. The stirring blade 11 rotates under the impetus of the airflow in the U-shaped mixing tube 9. The material distribution turntable 12 is connected to the sealed particle storage box 25 provided in the box body 5, and in the process of synchronous rotation with the stirring blade 11, the particles in the sealed particle storage box 25 are spread in the U-shaped mixing tube 9 to complete gas-solid mixing. The gas-solid mixed fluid is returned to the tube body of the particle adding section 2 through the air outlet pipe 7; 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 particle ejection holes 13 in an annular array. 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. CCD cameras are also installed at various locations in the experimental section 1, and the flow path of the fluid after the gas-solid mixture is photographed and detected by the CCD cameras.

[0020] 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 arranged in the particle adding device are retracted in the normal state, so that the airflow in the pressurized pipeline is not affected by the particle adding device. For details, please refer to the attached manual. 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 installing 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 with 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 an annular array, and a distribution compartment 14 is arranged inside. After falling into the distribution turntable 12, the particles are evenly divided in the distribution compartment 14 due to the rotation of the distribution turntable 12, and are thrown out from the particle ejection holes 13 as the distribution compartment 14 rotates. The stirring blade 11 is arranged at the rear end of the airflow direction of the distribution turntable 12. On the one hand, it provides power for the centrifugal ejection of the particles, and on the other hand, it stirs the thrown particles with the airflow, so as to promote more uniform mixing. In summary, the above 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 the experimental pipeline in the laboratory to detect the fluidity of the fluid in the pressurized pipeline. It can also be connected to the industrial pipeline in the field of industrial production for use, so that it can add different particulate matter according to different needs, wherein the added particulate matter includes but is not limited to tracer ions, quartz sand particles, nano-composite drag reducer particles, desiccant particles or a combination thereof, and the specific use is selected according to the technical effect to be achieved.

[0021] Embodiment 2: 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 groove 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 installed 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.

[0022] 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, and 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.

[0023] Embodiment three: 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 a 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 located outside the U-shaped mixing tube 9. A driven pulley 22 is fixedly rotatably installed on the side of the sealed particle storage box 25. The driving pulley 20 is connected to the driven pulley 22 through a 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 a unloading port 26 opened at the bottom of the sealed particle storage box 25.

[0024] Preferably, a material dropping pipe 27 is fixedly installed at the bottom of the material dropping port 26 , and the other end of the material dropping pipe 27 passes through the U-shaped mixing pipe 9 and is fixedly connected to a bearing ring 28 arranged at the axis center of the material distribution turntable 12 .

[0025] In this embodiment, a feed 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 feed turntable 24 through a connecting rod 23. The advantage of this arrangement is that the particles in the sealed particle storage box 25 can quantitatively enter the distribution turntable 12, and the rotation speed of the feed 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 pipeline body flowing through the stirring blade 11, which causes the rotation speed of the discharge turntable 24 to be positively correlated with the flow velocity inside the pipeline, so that when the pipeline flow velocity 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 then 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 distribution turntable 12 and a mixing mechanism for the particles and the gas in the pipeline, but can also release the particles quantitatively according to the gas flow velocity in the pipeline, so that the component produces multiple technical effects.

[0026] Embodiment 4: The pipe body of the particle adding section 2 is also equipped with a pressure balance pipe 29 which is connected with the sealed particle storage box 25 , and an opening and closing valve 30 is also installed on the pressure balance pipe 29 .

[0027] 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 connected to the sealed particle storage box 25. The purpose of this arrangement 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.

[0028] Embodiment five: 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.

[0029] 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 adding the particles, and a glass observation window 33 is also provided on the side of the box body 5, so as to facilitate observation of the conditions in the sealed particle storage box 25 during the particle addition process.

[0030] Embodiment six: The inner wall of the tube body of the particle adding section 2 is also provided with an electromagnet 34 , which, when powered on, magnetically adsorbs and fixes the air inlet pipe 6 and the air outlet pipe 7 against the inner wall of the tube body at the bottom of the particle adding section 2 .

[0031] 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. For this purpose, a magnetic adsorption material cooperating with the electromagnet 34 is provided at the bottom of the air inlet pipe 6 and the air outlet pipe 7.

[0032] 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 daily 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, and 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, and the gas changes its direction of travel, 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. Figure 2, since the gas in the particle adding section 2 passes through the U-shaped mixing tube 9, a stirring blade 11 is installed in the mixing tube 9 in a fixed-axis rotating manner. When the airflow passes through the stirring blade, it will push it to rotate on the fixed axis, and the stirring blade 11 is coaxially fixedly connected with the material distribution turntable 12. Therefore, the rotation of the stirring blade 11 will drive the material distribution turntable 12 to rotate synchronously. The material distribution turntable 12 is also connected to the blanking pipe 27 through a 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 make the sealed 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 gas-solid mixed fluid after stirring and mixing is returned to the particle adding section 2 through the outlet pipe 7.

[0033] Although 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 the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present 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 adding section are combined to form an airflow loop, a flange assembly port is provided on the pipeline of the particle adding section, and a particle adding device is fixedly installed at the flange assembly port by fastening bolts; The particle adding device comprises 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 with the air inlet end of the U-shaped mixing tube through a telescopic bellows, and the air outlet pipe is connected with the air outlet end of the U-shaped mixing tube through a telescopic bellows, and telescopic holes for lifting and lowering the air inlet pipe and the air outlet pipe are penetrated at the box body and the flange assembly port, the air inlet pipe and the air outlet pipe are contracted upward in the daily mode and the telescopic holes are blocked, and the air inlet pipe and the air outlet pipe are extended downward in the particle adding mode and enter the particle Inside the pipe body of the adding section, the air inlet pipe guides the airflow in the pipe to the U-shaped mixing tube in the particle adding mode, and a stirring blade is installed in the U-shaped mixing tube in a fixed-axis rotating manner. The stirring blade is coaxially fixedly connected with the material distribution turntable, and the stirring blade rotates under the impetus of the airflow in the U-shaped mixing tube. The material 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 blade, the particles in the sealed particle storage box are spread in the U-shaped mixing tube to complete gas-solid mixing, and the gas-solid mixed fluid is returned to the pipe 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. 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 provided at various locations of the experimental section, and the flow path of the fluid after the gas-solid mixture is photographed and detected by the CCD cameras.

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 and lowering movement of the lifting plate is arranged in a lifting slot provided 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 perform lifting and lowering movements through the telescopic movement of the telescopic arm of the electric hydraulic telescopic cylinder.

3. A device for testing gas-solid mixing and flow characteristics in a pressurized gas pipeline according to claim 1 or 2, characterized in that: An axial connecting rod is fixedly installed at the axis of the stirring blade, and the end of the axial connecting rod away from the stirring blade passes through a sealed bearing installed on the U-shaped mixing tube and extends to the outside of the U-shaped mixing tube. A driving pulley is fixedly installed at the end of the axial connecting rod outside the U-shaped mixing tube, and a driven pulley is 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 rotatably arranged on a fixed axis at a unloading port opened at the bottom of the sealed particle storage box.

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

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

6. The device for testing gas-solid mixing and flow characteristics in a pressurized gas pipeline according to claim 5, 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.

7. The device for testing gas-solid mixing and flow characteristics in a pressurized gas pipeline according to claim 6, 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.

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

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