Tubular atomization mixer performance on-line under-pressure measurement experiment device and experiment method

Abstract

The invention provides a tubular atomization mixer performance online under-pressure measurement experiment device and experiment method. The device comprises an under-pressure test pipeline and a mixing pipeline which are communicated with each other, and an atomization mixer is arranged at the communication position of the under-pressure test pipeline and the mixing pipeline; the under-pressure testing pipeline is provided with a sleeve liquid discharging part and a purging window assembly, the under-pressure testing pipeline comprises a liquid collecting section, a liquid discharging hole is formed in the pipe wall of the liquid collecting section, and the sleeve liquid discharging part is arranged outside the liquid collecting section in a sleeving mode and communicated with the liquid discharging hole; the purging window assembly comprises a circular seam purging part and an optical window, the circular seam purging part is provided with a circular seam purging flow channel, and the circular seam purging flow channel is communicated with the purging air inlet system; the optical window is fixed at the end part of the circular seam purging part, and a liquid drop particle size testing device is arranged at the optical window. The device can realize comprehensive test analysis of the atomization pressure difference, the atomization efficiency and the droplet particle size of the atomization mixer, realizes comprehensive experiment evaluation test of the performance of the atomization mixer under different pressure conditions, and is high in measurement precision.

Description

Technical Field

[0001] The invention relates to the technical field of gas-liquid atomization mixing, and in particular to an online pressure measurement experimental device and an experimental method for the performance of a tubular atomization mixer. Background Art

[0002] Gas-liquid contact mass transfer is common in gas purification processes such as natural gas deacidification, natural gas dehydration, carbon dioxide capture and industrial waste gas treatment. The gas-liquid contact mass transfer rate is a key factor affecting the treatment efficiency, treatment capacity and compactness of the device. In the traditional absorption tower, the gas-liquid countercurrent contact mass transfer has a small gas-liquid contact area and limited gas flow rate, resulting in low gas-liquid mass transfer efficiency and large volume and weight of gas-liquid contact mass transfer equipment. The tubular atomization mixing contact absorber adopts the gas-liquid co-current mode in the pipe to realize the atomization contact and enhanced mass transfer of the absorbent in the pipe space. It has the advantages of compactness and flexible installation and layout, and is expected to realize the technological transformation of absorption mass transfer equipment and processes. Atomization particle size, atomization efficiency and mixing uniformity are key parameters in the mixing effect of tubular atomization, which are of great significance for determining the optimal atomization mixer structure parameters and establishing the correlation between gas-liquid mass transfer absorption parameters.

[0003] In the test and evaluation of the atomization mixing effect of the tubular atomizing mixing contact absorber, it is necessary to measure the droplet size and atomization efficiency. The experimental conditions of the direct measurement and research of the open fog field using high-speed camera method, laser diffraction method, etc. are quite different from the actual operating conditions of the pressurized tubular equipment, and the mass transfer relationship between the atomization mixing effect and the pressure cannot be established. If an offline measurement method is used, the operation steps are complicated and the real-time performance is not high, which cannot meet the needs of real-time adjustment of on-site experiments. If observation windows are directly opened on both sides of the pipeline and sealed with glass, and observation is made through the glass, the droplets in the pipeline will splash onto the test glass window, which is easily contaminated and difficult to measure effectively.

[0004] Therefore, how to realize online pressure measurement of tubular atomization mixing has become a technical problem that needs to be solved urgently, which is of great significance to the research and development of tubular atomization mixers and the efficient and safe operation of aerosol separation equipment. Summary of the invention

[0005] The purpose of the present invention is to provide an experimental device and method for measuring the performance of a tubular atomizer mixer online under pressure, so as to solve the technical problem that the online pressure measurement of tubular atomizer mixers in the prior art is difficult to operate and difficult to measure effectively. The preferred technical solutions among the many technical solutions provided by the present invention can produce many technical effects as described below.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] The tubular atomizer mixer performance online pressure measurement experimental device provided by the present invention comprises a pressure test pipeline and a mixing pipeline connected to each other, an air supply system connected to the mixing pipeline and used to provide a high-pressure airflow, a liquid supply system for stable liquid supply, and a purge air intake system for providing a purge airflow, wherein:

[0008] The pressure test pipeline is connected to the liquid outlet end of the mixing pipeline, and an atomizing mixer is provided at the connecting position of the two to atomize the gas-liquid two-phase;

[0009] The pressure test pipeline is provided with a sleeve drain and a purge window assembly, the pressure test pipeline includes a liquid collecting section, a liquid drain hole is provided on the pipe wall of the liquid collecting section, the sleeve drain is sleeved outside the liquid collecting section and is connected with the liquid drain hole, and a liquid drain port is provided on the sleeve drain;

[0010] The purge window assembly includes an annular gap purge portion and an optical window. The annular gap purge portion is provided with an annular gap purge flow channel, and the annular gap purge flow channel is connected to the purge air intake system; the optical window is fixed to the end of the annular gap purge portion and is sealed, and a droplet particle size testing device is provided at the optical window.

[0011] Preferably, the drainage holes are evenly spaced on the peripheral wall of the liquid collecting section, and the inner cavity of the sleeve drainage portion is connected to the pressure test pipeline;

[0012] The purge window assembly is provided with two groups, which are respectively connected to the opposite sides of the pressure test pipeline and arranged in a cross-shaped interconnecting pipe.

[0013] Preferably, the annular gap purge portion is a cylindrical structure with open ends, one end of the cylindrical structure is connected to the purge air intake system, and the optical window closes the other end of the cylindrical structure; the annular gap purge flow channel is opened on the side wall of the annular gap purge portion to form a stable air curtain.

[0014] Preferably, the optical window includes an end cover, an optical glass and a first sealing ring, the optical glass is sealed and fixed to the end cover by the first sealing ring, and the droplet particle size testing device can measure the atomized droplet particle size and particle size volume distribution within the cross-sectional range of the pressurized test pipeline through the optical glass.

[0015] Preferably, the gas supply system includes a high-pressure gas pipeline, a variable frequency screw compressor, a gas storage tank, a pipeline pressure reducing valve, a gas flow regulating valve, and a pressure stabilizing and compensating integrated gas flow meter, which are arranged on the high-pressure gas pipeline in sequence along the gas flow direction, and the high-pressure gas pipeline is connected to the mixing pipeline;

[0016] The liquid supply system comprises a liquid pipeline, a liquid supply tank, a liquid injection pump and a liquid stop valve which are sequentially arranged on the liquid pipeline along the liquid flow direction, and the liquid pipeline is connected with the mixing pipeline.

[0017] Preferably, the purge air intake system includes a purge gas pipeline, a high-pressure gas cylinder located on the purge gas pipeline and arranged in sequence along the air flow direction, a gas pressure reducing valve, a trace gas flow meter, a gas flow regulating valve, and a gas three-way conversion joint, and the gas three-way conversion joint is connected to the annular seam purge flow channel through a purge pipeline.

[0018] Preferably, a T-shaped window tee, a gas flow stabilizer and a pressure sensor are sequentially arranged along the airflow direction of the mixing pipeline, and the T-shaped window tee includes a tee window end cover, a tee window glass and a second sealing ring, wherein:

[0019] The three-way sight window end cover is located at the starting end of the mixing pipeline and blocks it, and the three-way sight window glass is fixed on the three-way sight window end cover through the second sealing ring.

[0020] Preferably, the tubular atomizer mixer performance online pressure measurement experimental device also includes a gas-liquid collection, purification and pressure regulation system, and the gas-liquid collection, purification and pressure regulation system includes a cyclone separation section, a gas-liquid filter, a pressure regulating valve, a filter drain valve and a liquid drain valve, wherein:

[0021] The cyclone separation section is connected to the pressurized test pipeline and is used for performing gas-liquid separation on the gas-liquid mixed two-phase flow generated by atomization. The pressure regulating valve regulates the pressure in the pressurized test pipeline by controlling the opening size, thereby meeting the measurement conditions of different pressures in the pressurized test pipeline of atomization.

[0022] The present invention also provides an online pressure measurement experimental method for the performance of a tubular atomizing mixer, using the above-mentioned online pressure measurement experimental device for the performance of a tubular atomizing mixer, the method comprising:

[0023] Keep the gas-liquid stable flow state in the pressure test pipeline unchanged and test the droplet size:

[0024] The test time is t1 minutes, and the time is measured by a stopwatch. At the beginning of the test, the appropriate purge air intake volume is adjusted first, and then the droplet particle size test device is turned on. The droplet particle size change curve or distribution diagram is obtained through data processing software, and the gas-liquid atomization mixing characteristics in the tubular atomizer mixer are obtained through further data processing and analysis;

[0025] The atomization efficiency of the atomizer mixer is tested while maintaining the stable gas-liquid flow state in the pressure test pipeline unchanged:

[0026] The test time is t2 minutes, and the stopwatch is used to collect the un-atomized liquid on the wall of the pressure test pipeline from the discharge port of the sleeve discharge part at the beginning of the test, and the initial cumulative flow of the injection pump is recorded at the same time;

[0027] When the timing ends, the un-atomized liquid collecting device is quickly removed from below the liquid discharge port, and the accumulated flow rate at the end of the liquid injection pump is recorded. The volume of liquid in the un-atomized liquid collecting device is measured with a measuring cylinder, and the atomization efficiency can be calculated by the formula; wherein: the atomization efficiency of the atomizing mixer is calculated by the following formula:

[0028]

[0029] Where V 收集 V is the volume of liquid collected in the non-atomized liquid collection device within the specified timing time, ml; 输送 It is the cumulative flow rate of the injection pump at the end of the specified timing time, ml.

[0030] Preferably, before testing the droplet size and the atomization efficiency of the atomizer mixer, the method further comprises:

[0031] Step 1: Check the pipeline air tightness and circuit reliability of the entire experimental system; turn on the data processing computer and the droplet particle size test device, open the supporting software, adjust the laser probe position and optical path of the droplet particle size test device, and then preheat the instrument;

[0032] Step 2: adjusting the flow rate of the liquid supply system;

[0033] Step 3: adjusting the appropriate purge air intake volume of the purge air intake system;

[0034] Step 4: Adjust the flow rate of the gas supply system, thereby adjusting the gas flow rate and pressure of the pressure test pipeline, ensuring that the experimental gas flow rate and pressure reach the setting, and stably operate for the target time;

[0035] Step 5: According to the experimental setting requirements, based on the stable state of step 4, the pressure sensor is used to record the pressure difference when the single-phase airflow passes through the atomizer mixer; the liquid enters the atomizer mixer to ensure that the liquid flow is stable for a certain period of time, and then the atomization pressure difference of the atomizer mixer is recorded through the pressure sensor.

[0036] Compared with the prior art, the on-line pressure measurement experimental device and experimental method for the performance of a tubular atomizing mixer provided by the present invention have the following beneficial effects:

[0037] The droplet size test device measures the particle size and particle size volume distribution of the atomized droplets in the pressurized test pipeline by blowing the window assembly, and collects the un-atomized droplets on the wall of the pressurized test pipeline through the sleeve drain part, so as to calculate the atomization efficiency; the device can meet the test requirements of the spray laser particle size analyzer, can measure the droplet size online under pressure, and can simultaneously realize the comprehensive test and analysis of the atomization mixing performance of the atomizer mixer, such as the atomization pressure difference, atomization efficiency, and droplet size, and realize the comprehensive experimental evaluation test of the performance of the tubular atomizer mixer under different pressure conditions, with high measurement accuracy. The overall experimental device adopts a quick-install modular design, which can flexibly switch between different experimental conditions and test types to meet the test and evaluation of the performance of atomizer mixers with different structural forms. It is also suitable for other scenarios where pressurized glass windows are easily contaminated and affect the observation of the measuring equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0039] Figure 1 It is a schematic diagram of the overall structure of the online pressure measurement experimental device for the tubular atomization mixing performance of the present invention;

[0040] Figure 2 It is a side view of the T-shaped window tee of the present invention;

[0041] Figure 3 It is a cross-sectional view of the T-shaped window tee at AA of the present invention;

[0042] Figure 4 It is a schematic diagram of the cross-sectional structure at the liquid collecting section;

[0043] Figure 5 It is a structural schematic diagram of the pressure test pipeline;

[0044] Figure 6 It is a cross-sectional schematic diagram of the liquid collecting section of the pressure test pipeline;

[0045] Figure 7 is a side view of the optical window of the purge window assembly;

[0046] Figure 8 A cross-sectional view of the optical window AA of the purge window assembly;

[0047] Fig. 9 It is a cross-sectional view of the annular gap purge section AA.

[0048] In the figure: 1. variable frequency screw compressor; 2. gas storage tank; 3. pipeline pressure reducing valve; 4. gas flow regulating valve; 5. integrated gas flow meter with pressure stabilization and compensation; 6. T-type window tee; 7. quick-connect chuck; 8. gas flow stabilizer; 9. pressure sensor; 10. atomizing mixer; 11. pressure test pipeline; 12. sleeve drain; 13. liquid collection device; 14. purge window assembly; 15. spray laser particle size analyzer; 16. cyclone separation section; 17. gas-liquid filter; 18. pressure regulating valve; 19. filter drain valve; 20. drain valve; 21. gas tee conversion joint ; 22. Air intake flow regulating valve; 23. Gas flow meter; 24. Gas pressure reducing valve; 25. Gas cylinder; 26. Computer; 27. Liquid stop valve; 28. Liquid injection pump; 29. ​​Liquid supply tank; 30. Three-way sight glass end cover; 31. Three-way sight glass; 32. Second sealing ring; 33. Pressure test pipeline inlet; 35. Optical window; 36. Annular gap purge section; 37. Air inlet; 38. Pressure test pipeline outlet; 39. Drain port; 40. Liquid collecting section; 401. Drain hole; 41. End cover; 42. Optical glass; 43. First sealing ring; 44. Annular gap purge flow channel. DETAILED DESCRIPTION

[0049] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0050] In the description of the present invention, it should be understood that the terms "center", "length", "width", "height", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "side" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0051] The embodiment of the present invention provides an experimental device and method for online pressure measurement of the performance of a tubular atomizer mixer, wherein the purge window assembly 14 is a laser diffraction test window structure to prevent droplets from contaminating the window, and can complete comprehensive test and evaluation of the droplet size distribution, atomization efficiency, atomization pressure difference and other performance of the atomizer mixer 10 under different pressures, media, gas-liquid flow rates and other conditions. The experimental device adopts a quick-install modular design, which can flexibly switch between different experimental conditions and test types to meet the test and evaluation of the performance of tubular gas-liquid atomizer mixers 10 with different structural forms. It is also suitable for other scenarios where pressurized glass windows are easily contaminated and affect the observation of measurement equipment, such as: testing and evaluating the separation effect of a demisting gas-liquid separator, and has a wide range of practical value.

[0052] Combine the following Figure 1-Figure 9 The technical solution provided by the present invention is described in more detail.

[0053] Embodiment 1:

[0054] like Figure 1-Figure 9 As shown, the performance online pressure measurement experimental device of the tubular atomizing mixer 10 provided by the present invention comprises a pressure test pipeline 11 and a mixing pipeline connected to each other, an air supply system connected to the mixing pipeline and used for providing a high-pressure airflow, a liquid supply system for a stable liquid supply, and a purge air intake system for providing a purge airflow, wherein: the pressure test pipeline 11 is connected to the liquid outlet end of the mixing pipeline, and the atomizing mixer 10 is arranged at the connecting position of the two to atomize the gas-liquid two-phase; the pressure test pipeline 11 is provided with a sleeve drain portion 12 and a purge window assembly 14, and the pressure test pipeline 11 is connected to the mixing pipeline. The test tube 11 includes a liquid collecting section 40, a drainage hole 401 is arranged on the tube wall of the liquid collecting section 40, a sleeve drainage portion 12 is sleeved outside the liquid collecting section 40 and is connected with the drainage hole 401, and a drainage port 39 is arranged on the sleeve drainage portion 12; the purge window assembly 14 includes an annular gap purge portion 36 and an optical window 35, an annular gap purge channel 44 is arranged on the annular gap purge portion 36, and the annular gap purge channel 44 is connected with the purge air intake system; the optical window 35 is fixed to the end of the annular gap purge portion 36 and is sealed, and a droplet particle size testing device is arranged at the optical window 35.

[0055] Among them, the droplet particle size testing device includes a spray laser particle size analyzer 15 and a data processing computer 26 in the prior art. The spray laser particle size analyzer 15 is arranged outside the optical window 35, and measures the particle size and particle volume distribution of the atomized droplets within the cross-sectional range of the optical window 35 of the pressurized test pipeline 11, and is connected to the data processing computer 26 via a data cable.

[0056] See also Figure 1As shown, the pressure test pipeline 11 and the mixing pipeline are horizontally arranged pipelines, which are fixedly connected, and the mixing pipeline is the upstream pipeline of the pressure test pipeline 11. The gas and liquid phases are mixed in the mixing pipeline and atomized by the atomizing mixer 10. In the pressure test pipeline 11, the atomization efficiency and droplet size distribution can be tested.

[0057] As an alternative embodiment, see Figure 1 As shown, the gas supply system includes a high-pressure gas pipeline, a variable frequency screw compressor 1, a gas storage tank 2, a pipeline pressure reducing valve 24, an air intake flow regulating valve 22, and a pressure stabilizing and compensating integrated gas flow meter 23, and the high-pressure gas pipeline is connected to the mixing pipeline. The gas supply system provides a stable high-pressure gas flow for the pressure test pipeline 11.

[0058] In the embodiment of the present invention, the gas supply system adopts a variable frequency screw compressor 1, which can automatically adjust the screw speed according to the gas flow required by the experiment to ensure the stability of the pressure and flow of the gas supply system.

[0059] See also Figure 1 As shown, the liquid supply system includes a liquid pipeline, a liquid supply tank 29, a liquid injection pump 28, and a liquid stop valve 27 arranged in sequence along the liquid flow direction on the liquid pipeline, and the liquid pipeline is connected to the mixing pipeline. The liquid supply system provides a stable liquid supply to the atomizing mixer 10.

[0060] In the embodiment of the present invention, the liquid supply system uses an injection pump 28 to provide power for the liquid flow to ensure the stability of the liquid supply under a small flow rate, and the pressure of the injection pump 28 is guaranteed to be within the range of 1 MPa.

[0061] In the embodiment of the present invention, the liquid medium of the atomizing mixer 10 can be changed according to the experimental requirements, and can be water, white oil, alcohol amine solution, glycol and other liquid media.

[0062] See also Figure 1 As shown, the purge air intake system includes a purge gas pipeline, a high-pressure gas cylinder 25 arranged in sequence along the air flow direction on the purge gas pipeline, a gas pressure reducing valve 24, a trace gas flow meter 23, an air intake flow regulating valve 22, and a gas three-way conversion joint 21. The gas three-way conversion joint 21 is connected to the annular gap purge flow channel 44 through a purge pipeline. The purge air intake system provides a clean and stable purge air flow for the annular gap purge part 36.

[0063] As an alternative embodiment, see Figure 1As shown, the online pressure measurement experimental device for the performance of the tubular atomizing mixer 10 also includes a gas-liquid collection, purification and pressure regulation system, which includes a cyclone separation section 16, a gas-liquid filter 17, a pressure regulating valve 18, a filter drain valve 19 and a liquid drain valve, wherein: the cyclone separation section 16 is connected to the pressure test pipeline 11, and is used for gas-liquid separation of the gas-liquid mixed two-phase flow generated by atomization, and the pressure regulating valve 18 regulates the pressure in the pressure test pipeline 11 by controlling the opening size, thereby satisfying the measurement conditions of different pressures in the atomization pressure test pipeline 11.

[0064] As an alternative embodiment, see Figure 5 As shown, the drainage holes 401 are evenly spaced on the peripheral wall of the liquid collecting section 40, and the inner cavity of the sleeve drainage part 12 is connected to the pressure test pipeline 11 through the drainage holes 401; during the measurement process, the sleeve drainage part 12 first collects the liquid film that is not atomized and attached to the tube wall to evaluate the atomization efficiency. The liquid collecting section 40 is a stainless steel tube with a porous wall, such as Figure 5 As shown, the liquid film that is not atomized and attached to the tube wall is collected to evaluate the atomization efficiency.

[0065] The pressure test pipeline 11 is mainly made of welded stainless steel pipes, and the inlet and outlet are sealed and connected to the mixing pipeline and the cyclone separation section 16 of the gas-liquid collection, purification and pressure regulation system by flanges. Figure 4 The pressure test pipeline inlet 33 and the pressure test pipeline outlet 38 are fixedly connected to the liquid outlet end of the mixing pipeline and the cyclone separation section 16 respectively.

[0066] See also Figure 4 There are two groups of purge window assemblies 14, which are respectively connected to the opposite sides of the pressure test pipeline 11 and arranged in a cross-shaped interconnecting pipe.

[0067] The spray laser particle size analyzer 15 measures the particle size and concentration of the atomized droplets in the pressurized test pipeline 11 by blowing the window assembly 14 . The annular gap blowing part 36 ensures that the optical glass 42 is free of pollution, thereby obtaining accurate measurement results.

[0068] As an optional embodiment, the annular gap purge portion 36 is a cylindrical structure with open ends, one end of the cylindrical structure is connected to the purge air intake system, and the optical window 35 closes the other end of the cylindrical structure; the annular gap purge flow channel 44 is opened on the side wall of the annular gap purge portion 36 to form a stable air curtain.

[0069] In this embodiment, the sleeve drain portion 12 and the purge window assembly 14 are the key to performing pressure-online measurement. Figure 4 As shown, the annular gap purge portion 36 has an air inlet 37 that enters the annular gap purge flow channel 44. Figure 6As shown, air inlet purge is performed through the annular gap purge channel 44 to prevent droplets in the pipe flow from splashing onto the optical windows 35 on both sides, thereby preventing interference with the measurement results.

[0070] As an optional embodiment, the optical window 35 includes an end cover 41, an optical glass 42 and a first sealing ring 43. The optical glass 42 is sealed and fixed to the end cover 41 by the first sealing ring 43. The droplet particle size testing device can measure the atomized droplet particle size and particle size volume distribution within the cross-sectional range of the pressurized test pipeline 11 through the optical glass 42.

[0071] The glass window is made of high-transmittance optical glass 42, the optical glass 42 is fixed by a threaded end cap 41, and the optical glass 42 is sealed by a first sealing ring 43. Figure 5 shown.

[0072] As an alternative embodiment, see Figure 1 , Figure 2 and Figure 3 As shown, a T-shaped window tee 6, a gas flow stabilizer 8 and a pressure sensor 9 are sequentially arranged along the airflow direction of the mixing pipeline. The T-shaped window tee 6 includes a three-way window end cover 30, a three-way window glass 31 and a second sealing ring 32, wherein: the three-way window end cover 30 is located at the starting end of the mixing pipeline and seals it, and the three-way window glass 31 is fixed to the three-way window end cover 30 through the second sealing ring 32.

[0073] The three-way window glass 31 also uses high-transmittance optical glass 42, and the three-way window glass 31 is fixed with a threaded three-way window end cover 30, which is convenient for disassembly and cleaning of the window glass. At the same time, the pressure atomization effect of the atomizing mixer 10 can be observed through the three-way window glass 31.

[0074] The inner wall surface of each pipe section of the experimental device needs to be smoothed and flattened to facilitate separation and drainage. The pipe sections are connected by a quick-connect chuck 7 structure, and the pressure test pipeline 11 is connected to the atomizing mixer 10 and the cyclone separation section 16 through a flange. The experimental bench is assembled with aluminum alloy profiles, and the overall detachable modular design is adopted, which is convenient for disassembly, combination and adjustment of the experimental device according to the different atomization structures to be tested.

[0075] Embodiment 2:

[0076] This embodiment provides an online pressure measurement experimental method for the performance of a tubular atomizing mixer. Using the online pressure measurement experimental device for the performance of a tubular atomizing mixer of the above embodiment, the method is performed according to the following steps:

[0077] Step 1: Check the pipeline air tightness and circuit reliability of the entire experimental system; turn on the data processing computer 26 and the spray laser particle size analyzer 15, open the supporting software, adjust the laser probe position and optical path of the spray laser particle size analyzer 15, and then preheat the instrument.

[0078] Step 2: Close the liquid stop valve 27, inject a sufficient amount of the liquid medium required for the test into the liquid supply tank 29, turn on the injection pump 28 and then adjust the required liquid inlet flow rate.

[0079] Step 3: Close the purge air intake flow regulating valve 22, open the gas cylinder 25, adjust the gas pressure reducing valve 24 to the set purge pipeline intake pressure, and select the appropriate purge air intake volume through the air intake flow regulating valve 22 combined with the indication of the trace gas flow meter 23 during purge.

[0080] Step 4: First close the gas flow regulating valve 4, check the set pressure and then open the variable frequency screw compressor 1. The atmospheric pressure air is pressurized by the variable frequency screw compressor and becomes high-pressure air. The high-pressure air enters the gas storage tank after being purified by the pipeline gas filter). The high-pressure air in the gas storage tank 2 is reduced in pressure by the pipeline pressure reducing valve 3 and then enters the pressure stabilizing and compensating integrated gas flow meter 5. By adjusting the opening of the gas flow regulating valve 4 and the outlet pressure regulating valve 18, the gas flow and pressure of the experimental pipeline are regulated to the set values, and stably run for 5 minutes.

[0081] Step 5: According to the experimental setting requirements, based on the stable state of step 4, the pressure difference when the single-phase airflow passes through the atomizing mixer is recorded by the pressure sensor 9; the liquid stop valve 27 is opened, the liquid injection pump 28 delivery switch is turned on, and the liquid enters the atomizing mixer 10, and the liquid flow is ensured to be stable for 2 minutes, and then the atomization pressure difference of the atomizing mixer 10 is recorded by the pressure sensor 9;

[0082] Step 6: Keep the gas-liquid stable flow state in step 5 unchanged and test the droplet size of the atomizer mixer 10; the test time is 2 minutes, which is timed by a stopwatch. At the beginning of the test, first open the purge air flow regulating valve 22, adjust the appropriate purge air volume, and then open the spray laser particle size analyzer 15 laser probe and data processing computer 26 on both sides of the optical window of the pressurized test pipeline 11. The droplet size change curve or distribution cloud map is obtained through the data processing software, and the gas-liquid atomization mixing characteristics in the tubular atomizer mixer are obtained through further data processing and analysis.

[0083] Step 7: Keep the gas-liquid stable flow state in step 5 unchanged, and test the atomization efficiency of the tubular gas-liquid atomizing mixer; the test time is 5 minutes, and the stopwatch is used to time it. At the beginning of the test, the sleeve drain 12 of the pressure test pipeline 11 collects the un-atomized liquid on the tube wall, and the initial cumulative flow of the injection pump 28 is recorded; when the timing ends, the un-atomized liquid collection device 13 is quickly removed from the bottom of the drain port, and the cumulative flow at the end of the injection pump 28 is recorded. The liquid volume in the un-atomized liquid collection device 13 is measured with a measuring cylinder, and the atomization efficiency can be calculated by the formula. Among them: The atomization efficiency of the atomizing mixer is calculated using the following formula,

[0084]

[0085] Where V 收集 V is the volume of liquid collected in the non-atomized liquid collection device within the specified timing time, ml; 输送 It is the cumulative flow rate of the injection pump at the end of the specified timing time, ml.

[0086] Step 8: After the data required for the experiment are measured, first turn off the injection pump 28 of the liquid supply system, and then gradually close the liquid stop valve 27; close the purge air flow regulating valve 22, and close the gas cylinder 25; turn off the variable frequency screw compressor 1, wait for the gas pressure in the gas storage tank 2 to be zero, and then close the pipeline pressure reducing valve 3 and the gas flow regulating valve 4; collect the liquid in the pipeline through the drain valve 20; stop running the spray laser particle size analyzer 15 and the computer 26, and complete a complete tubular gas-liquid atomizer mixer atomization mixing performance test experiment.

[0087] Compared with the prior art, the present invention has the following beneficial effects:

[0088] (1) The experimental device and method of the present invention, combined with testing means such as pressure sensors and spray laser particle size analyzers, can simultaneously realize comprehensive testing and analysis of atomization mixing performance such as atomization pressure difference, atomization efficiency, and droplet particle size of a tubular gas-liquid atomizer mixer, and realize comprehensive experimental evaluation and testing of the performance of a tubular atomizer mixer under different pressure conditions, with high measurement accuracy.

[0089] (2) In the experimental device of the present invention, the purge window assembly and the sleeve drain can meet the test requirements of the spray laser particle size analyzer, and can measure the droplet particle size online under pressure. The experimental device as a whole adopts a quick-install modular design, which can flexibly switch between different experimental conditions and test types to meet the test and evaluation of the performance of tubular gas-liquid atomizer mixers with different structural forms. It is also suitable for other scenarios where pressurized glass windows are easily contaminated and affect the observation of measurement equipment.

[0090] In the description of this specification, specific features, structures or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0091] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0092] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. An experimental device for online pressure measurement of the performance of a tubular atomizer mixer, characterized in that: It includes a pressure test pipeline and a mixing pipeline connected to each other, an air supply system connected to the mixing pipeline and used to provide a high-pressure airflow, a liquid supply system for stable liquid supply, and a purge air intake system for providing a purge airflow, wherein: The pressure test pipeline is connected to the liquid outlet end of the mixing pipeline, and an atomizing mixer is provided at the connecting position of the two to atomize the gas-liquid two-phase; The pressure test pipeline is provided with a sleeve drain and a purge window assembly, the pressure test pipeline includes a liquid collecting section, a liquid drain hole is provided on the pipe wall of the liquid collecting section, the sleeve drain is sleeved outside the liquid collecting section and is connected with the liquid drain hole, and a liquid drain port is provided on the sleeve drain; The purge window assembly includes an annular gap purge portion and an optical window. The annular gap purge portion is provided with an annular gap purge flow channel, and the annular gap purge flow channel is connected to the purge air intake system; the optical window is fixed to the end of the annular gap purge portion and is sealed, and a droplet particle size testing device is provided at the optical window.

2. The on-line pressure measurement experimental device for the performance of a tubular atomizer mixer according to claim 1 is characterized in that: The drainage holes are evenly spaced on the peripheral wall of the liquid collecting section, and the inner cavity of the sleeve drainage portion is connected to the pressure test pipeline; The purge window assembly is provided with two groups, which are respectively connected to the opposite sides of the pressure test pipeline and arranged in a cross-shaped interconnecting pipe.

3. The on-line pressure measurement experimental device for the performance of a tubular atomizer mixer according to claim 1 is characterized in that: The annular gap purge portion is a cylindrical structure with open ends, one end of the cylindrical structure is connected to the purge air intake system, and the optical window closes the other end of the cylindrical structure; the annular gap purge flow channel is opened on the side wall of the annular gap purge portion to form a stable air curtain.

4. The on-line pressure measurement experimental device for the performance of a tubular atomizer mixer according to claim 1 is characterized in that: The optical window includes an end cover, an optical glass and a first sealing ring. The optical glass is sealed and fixed to the end cover through the first sealing ring. The droplet particle size testing device can measure the atomized droplet particle size and particle size volume distribution within the cross-sectional range of the pressurized test pipeline through the optical glass.

5. The on-line pressure measurement experimental device for the performance of a tubular atomizer mixer according to claim 1 is characterized in that: The gas supply system includes a high-pressure gas pipeline, a variable frequency screw compressor, a gas storage tank, a pipeline pressure reducing valve, a gas flow regulating valve, and a pressure stabilizing and compensating integrated gas flow meter, which are arranged on the high-pressure gas pipeline in sequence along the gas flow direction. The high-pressure gas pipeline is connected to the mixing pipeline; The liquid supply system comprises a liquid pipeline, a liquid supply tank, a liquid injection pump and a liquid stop valve which are sequentially arranged on the liquid pipeline along the liquid flow direction, and the liquid pipeline is connected with the mixing pipeline.

6. The on-line pressure measurement experimental device for the performance of a tubular atomizer mixer according to claim 1 is characterized in that: The purge air intake system includes a purge gas pipeline, a high-pressure gas cylinder arranged in sequence on the purge gas pipeline along the air flow direction, a gas pressure reducing valve, a trace gas flow meter, a gas flow regulating valve, and a gas three-way conversion joint. The gas three-way conversion joint is connected to the annular seam purge flow channel through a purge pipeline.

7. The on-line pressure measurement experimental device for the performance of a tubular atomizer mixer according to claim 1 is characterized in that: A T-shaped window tee, a gas flow stabilizer and a pressure sensor are sequentially arranged along the airflow direction of the mixing pipeline, wherein the T-shaped window tee comprises a tee window end cover, a tee window glass and a second sealing ring, wherein: The three-way sight window end cover is located at the starting end of the mixing pipeline and blocks it, and the three-way sight window glass is fixed on the three-way sight window end cover through the second sealing ring.

8. The on-line pressure measurement experimental device for the performance of a tubular atomizer mixer according to claim 1 is characterized in that: The tubular atomizer mixer performance online pressure measurement experimental device also includes a gas-liquid collection, purification and pressure regulation system, which includes a cyclone separation section, a gas-liquid filter, a pressure regulating valve, a filter drain valve and a liquid drain valve, wherein: The cyclone separation section is connected to the pressurized test pipeline and is used for performing gas-liquid separation on the gas-liquid mixed two-phase flow generated by atomization. The pressure regulating valve regulates the pressure in the pressurized test pipeline by controlling the opening size, thereby meeting the measurement conditions of different pressures in the pressurized test pipeline of atomization.

9. An experimental method for measuring the performance of a tubular atomizer mixer online under pressure, characterized in that: Using the tubular atomizing mixer performance online pressure measurement experimental device according to any one of claims 1 to 8, the method comprises: Keep the gas-liquid stable flow state in the pressure test pipeline unchanged and test the droplet size: The test time is t1 minutes, and the time is measured by a stopwatch. At the beginning of the test, the appropriate purge air intake volume is adjusted first, and then the droplet particle size test device is turned on. The droplet particle size change curve or distribution diagram is obtained through data processing software, and the gas-liquid atomization mixing characteristics in the tubular atomizer mixer are obtained through further data processing and analysis; The atomization efficiency of the atomizer mixer is tested while maintaining the stable gas-liquid flow state in the pressure test pipeline unchanged: The test time is t2 minutes, and the stopwatch is used to collect the un-atomized liquid on the wall of the pressure test pipeline from the discharge port of the sleeve discharge part at the beginning of the test, and the initial cumulative flow of the injection pump is recorded at the same time; When the timing ends, the un-atomized liquid collecting device is quickly removed from below the liquid discharge port, and the accumulated flow rate at the end of the liquid injection pump is recorded. The volume of liquid in the un-atomized liquid collecting device is measured with a measuring cylinder, and the atomization efficiency can be calculated by the formula; wherein: the atomization efficiency of the atomizing mixer is calculated by the following formula: Where V 收集 V is the volume of liquid collected in the non-atomized liquid collection device within the specified timing time, ml; 输送 It is the cumulative flow rate of the injection pump at the end of the specified timing time, ml.

10. The on-line pressure measurement experimental method for the performance of a tubular atomizing mixer according to claim 9, characterized in that: Before testing the droplet size and the atomization efficiency of the atomizer mixer, the method further comprises: Step 1: Check the pipeline air tightness and circuit reliability of the entire experimental system; turn on the data processing computer and the droplet particle size test device, open the supporting software, adjust the laser probe position and optical path of the droplet particle size test device, and then preheat the instrument; Step 2: adjusting the flow rate of the liquid supply system; Step 3: adjusting the appropriate purge air intake volume of the purge air intake system; Step 4: Adjust the flow rate of the gas supply system, thereby adjusting the gas flow rate and pressure of the pressure test pipeline, ensuring that the experimental gas flow rate and pressure reach the setting, and stably operate for the target time; Step 5: According to the experimental setting requirements, based on the stable state of step 4, the pressure sensor is used to record the pressure difference when the single-phase airflow passes through the atomizer mixer; the liquid enters the atomizer mixer to ensure that the liquid flow is stable for a certain period of time, and then the atomization pressure difference of the atomizer mixer is recorded through the pressure sensor.

Images