Simulation experiment device and test method for sulfur particle deposition of high-sulfur natural gas elbow

Abstract

The invention discloses a high-sulfur-content natural gas elbow sulfur particle deposition simulation experiment device and a testing method, and relates to the technical field of high-sulfur-content natural gas gathering and transportation pipeline sulfur particle dynamic deposition. The sulfur particle deposition simulation experiment device for the high-sulfur-content natural gas pipeline can simulate the dynamic deposition process of sulfur particles under various working conditions such as different flow rates of the sulfur particles, different flow rates of gas, different particle sizes of the sulfur particles, different pipeline pressures, different pipe bending angles and different pipe bending materials; through the two-stage recovery and two-stage purification scheme of the activated carbon adsorption device, the cloth bag dust collector and the secondary filter screen, the sulfur particle recovery rate is highly reliable, and the danger to the environment and testers is remarkably reduced; and through the coupling design of the micro vibrator and the sulfur particle injection device, the problem of blockage caused by sulfur particle agglomeration is effectively solved, and the manual intervention frequency is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of dynamic deposition of sulfur particles in high-sulfur natural gas gathering and transportation pipelines, and specifically to a simulation experiment device and a testing method for sulfur particle deposition in high-sulfur natural gas elbows. Background Technique

[0002] With the rapid development of China's economy, the continuous growth of energy demand has made the development of unconventional gas reservoirs, including high-sulfur gas reservoirs, increasingly important. However, during the exploitation and production of high-sulfur gas reservoirs, the problem of sulfur deposition in gathering and transportation pipelines affects their efficient development. The increase in flow resistance, the aggravation of corrosion, and the blockage risk caused by sulfur particle deposition in pipelines have become key problems restricting safe transportation. Sulfur precipitates and deposits due to changes in temperature and pressure conditions in pipelines, and its distribution law is significantly affected by the flow velocity of gas-solid two-phase flow, pressure fluctuations, and pipeline geometric structures such as elbows and reduced-diameter sections. Most of the existing experimental devices are designed based on static or simplified working conditions, and it is difficult to accurately reproduce the coupling mechanism of the dynamic flow field and sulfur particle deposition in the actual transportation process. This results in insufficient accuracy of the deposition prediction model and a lack of reliable basis for optimizing the pigging cycle.

[0003] The patents on simulation devices for gas-solid two-phase flow particle deposition that have been publicly published are as follows:

[0004] Patent CN112945812A publicly discloses a sulfur deposition testing device for high-sulfur natural gas gathering and transportation pipelines. This patent realizes dynamic simulation and monitoring through a sulfur deposition testing system and a data acquisition system. However, for the design of the purging system, it relies on manual disassembly and re-cleaning of residual sulfur particles in the pipeline, resulting in limited experimental repeatability and efficiency. At the same time, the pressure difference control at the rear end of the sulfur particle injector is insufficient. Only relying on the front-section pressure compensation pipe to balance the injection pressure cannot ensure the uniform falling of sulfur particles, thus affecting the measurement accuracy of the deposition rate and the cumulative amount.

[0005] Patent CN110108444A discloses a sulfur deposition experimental device for high-sulfur natural gas pipelines. This invention can quantitatively analyze the influence laws of parameters such as pipe wall roughness, pressure, and flow velocity on the sulfur deposition rate through a detachable pipe section structure and a multi-variable regulation module. However, its gas storage system does not set up a gas replenishment linkage system, and in the later stage of the experiment, the gas supply pressure may decay due to insufficient gas storage volume, leading to flow velocity fluctuations and destroying the steady-state consistency of experimental parameters.

[0006] Based on this, in the prior art, the waste gas treatment of sulfur particle deposition experimental devices mostly relies on open discharge or simple filtration, and does not deeply purify the possible sulfur-containing vapors and harmful gases, posing environmental pollution and health hazards to operators. At the same time, defects such as particle agglomeration and flow field instability caused by pressure difference fluctuations during the sulfur particle injection process, as well as low sediment recovery efficiency and poor experimental repeatability, limit the accuracy of the research on sulfur deposition mechanisms.

[0007] Therefore, a new solution to the above problems is needed. Summary of the Invention

[0008] The object of the present invention is to provide a simulation experimental device and a testing method for sulfur particle deposition in high-sulfur natural gas elbows, aiming to provide a simulation experimental device and a testing method for sulfur particle deposition in high-sulfur natural gas elbows. By precisely controlling the parameters of gas-solid two-phase flow and real-time monitoring of the dynamic sulfur particle deposition, combined with the high-precision weighing, two-stage recovery and double-stage purification scheme of modular deposition pipe segments, the deposition distribution law of sulfur particles in the pipeline is safely and efficiently quantified, the deposition law of sulfur particles in the pipeline is revealed, and an experimental basis is provided for optimizing the pigging cycle and ensuring the flow safety of high-sulfur pipelines, so as to solve the technical problems raised in the background technology.

[0009] To achieve the above object, the present invention provides the following technical solution: A simulation experimental device for sulfur particle deposition in high-sulfur natural gas elbows, including a gas supply component, a gas-solid two-phase flow migration pipe segment (19), a sulfur particle feeding component, an elbow deposition section component and an emission treatment component. One end of the gas supply component is connected to the gas-solid two-phase flow migration pipe segment (19), the top of the gas-solid two-phase flow migration pipe segment (19) is connected to the sulfur particle feeding component, one end of the gas-solid two-phase flow migration pipe segment (19) away from the gas supply component is equipped with an elbow deposition section component, and one end of the elbow deposition section component away from the gas-solid two-phase flow migration pipe segment (19) is equipped with an emission treatment component.

[0010] Further, the gas supply component includes an air compressor (1), a safety valve (3), a gas buffer tank (4), a gate valve (6) and a Y-type filter (7). An air compressor (1) is arranged at one end of the gas buffer tank (4), and the air compressor (1) is connected to the gas buffer tank (4) through a bidirectional flange pipe (2). A safety valve (3) and a pressure sensor (8) are arranged on the top of the gas buffer tank (4), a drain port (5) is arranged at the bottom end of the gas buffer tank (4), a gas outlet is fixedly connected to the end of the gas buffer tank (4) away from the air compressor (1), and the end of the gas outlet away from the gas buffer tank (4) is connected to the gas-solid two-phase flow migration pipe segment (19) through the gate valve (6) and the Y-type filter (7) in sequence. The opening pressure of the safety valve (3) conforms to the ASME BPVC Section VIII standard and is set to 1.1 times the design pressure of the gas buffer tank (4).

[0011] Furthermore, a pressure sensor (8), a flow sensor (9), a temperature sensor (10) and a flapper check valve (11) are integrated at the front part of the gas-solid two-phase flow migration pipe section (19). The pressure sensor (8), the flow sensor (9) and the temperature sensor (10) are used to monitor the gas pressure, flow rate and temperature in real time. A replaceable first filter screen (18) is fixed to the inner wall of the gas-solid two-phase flow migration pipe section (19) through a clamping groove. The first filter screen (18) is used to intercept large-particle impurities. A gas purge port (12) and another sewage discharge port (5) are arranged at the bottom end of the gas-solid two-phase flow migration pipe section (19). The gas purge port (12) is used for purging after the experiment, and the sewage discharge port (5) is used for discharging residues in a directional manner after the experiment. The gas flow rate in the gas-solid two-phase flow migration pipe section (19) is closed-loop controlled by the flow sensor (9).

[0012] Furthermore, the sulfur particle feeding assembly includes a gas purge port (12), a sulfur particle filling valve (13), a sulfur particle injection device (14), a micro vibrator (15), a pressure equalizing filter screen (16) and a knife gate valve (17). The bottom end of the sulfur particle injection device (14) is connected to the gas-solid two-phase flow migration pipe section (19) through the knife gate valve (17). The knife gate valve (17) is used to regulate the flow rate of sulfur particles conveyed by the sulfur particle injection device (14) into the gas-solid two-phase flow migration pipe section (19). The opening and closing size of the knife gate valve (17) is manually controlled. A micro vibrator (15) is fixedly connected to one end of the sulfur particle injection device (14). The micro vibrator (15) is used to optimize the uniformity of particle falling. A pressure equalizing filter screen (16) is arranged at the end of the sulfur particle injection device (14) far from the micro vibrator (15). The pressure equalizing filter screen (16) is connected to the first filter screen (18) through a pipeline. The pressure equalizing filter screen (16) stabilizes the pressure of the sulfur particle injection device (14) through a pipeline pressure difference compensation mechanism with the filter screen (18). Another double flanged pipe (2), a gas purge port (12) and a sulfur particle filling valve (13) are fixedly connected to the top end of the sulfur particle injection device (14). The bottom end of the another double flanged pipe (2) is connected to the gas-solid two-phase flow migration pipe section (19). The sulfur particle filling valve (13) is used for filling sulfur particles.

[0013] Furthermore, the elbow deposition section assembly includes a transparent detachable deposition elbow pipe section (20), a high-density grid background board (21), and a visualization observation window (22). One end of the transparent detachable deposition elbow pipe section (20) is connected to the gas-solid two-phase flow migration pipe section (19). The transparent detachable deposition elbow pipe section (20) is made of a material with a high light transmittance. A high-density grid background board (21) is arranged on one side of the transparent detachable deposition elbow pipe section (20), and a visualization observation window (22) is arranged on the other side of the transparent detachable deposition elbow pipe section (20). A high-speed camera (28) is placed at one end of the visualization observation window (22) away from the transparent detachable deposition elbow pipe section (20). The movement trajectory and deposition distribution of sulfur particles are recorded through the cooperation of the high-density grid background board (21), the visualization observation window (22), and the high-speed camera (28).

[0014] Furthermore, the emission treatment assembly includes a bag filter (23), a dust collection box (24), a quick-opening baffle (25), a gas vent pipe (26), and an activated carbon adsorption device (27). The other end of the transparent detachable deposition elbow pipe section (20) is equipped with a guiding pipe. One end of the guiding pipe away from the transparent detachable deposition elbow pipe section (20) is connected to the dust collection box (24) and the bag filter (23). A second filter screen (18) is arranged inside the dust collection box (24). A gas vent pipe (26) is arranged at the top of the dust collection box (24) corresponding to the position of the second filter screen (18). The un-deposited gas is discharged through the gas vent pipe (26) after two-stage dust collection by the dust collection box (24) and the bag filter (23). An activated carbon adsorption device (27) is arranged inside the gas vent pipe (26), and the inside of the activated carbon adsorption device (27) is filled with activated carbon filter elements. The activated carbon adsorption device (27) is used to adsorb some sulfur-containing vapors and harmful gases to ensure that the discharged gas meets the emission standards. A quick-opening baffle (25) is arranged at one end of the dust collection box (24) away from the guiding pipe. When the quick-opening baffle (25) is opened, it is used to take out the bag filter (23) from the dust collection box (24) to realize quantitative weighing of the sediment.

[0015] Furthermore, the transparent detachable deposition elbow pipe section (20) is made of polycarbonate material, with a pressure resistance of ≥2 MPa, a light transmittance of ≥90%, and an impact strength of ≥60 kJ / m 2 , suitable for a dynamic pressure environment of 0.1 - 2 MPa. The ratio of the curvature radius to the pipe diameter of the transparent detachable deposition elbow pipe section (20) is adjustable within 1.2:1 - 2.0:1 according to different experimental requirements;

[0016] The high-density grid background board (21) is a black-and-white high-contrast grid, and the accuracy of a single grid is 1 mm × 1 mm.

[0017] Further, the pressure equalizing filter screen (16) is a single-layer screen with a screen aperture of 1-2 mm. The pressure equalizing filter screen (16) is inclinedly installed, and the inclination angle is 30° to 45°. The pressure equalizing filter screen (16) is used to disperse sulfur particles and balance the pressure difference between the sulfur particle injection device (14) and the gas-solid two-phase flow transport pipe section (19).

[0018] Further, the filtering material of the bag filter (23) is PES, and the filtering efficiency is ≥99.5%. The aperture of the second filter screen (18) is ≤5 μm, which is used for quantitatively recovering undeposited particles. The dust collection box (24) and the second filter screen (18) are fixed by a snap-fastener structure, which supports quick replacement and cleaning.

[0019] A test method for a high-sulfur natural gas elbow sulfur particle deposition simulation experimental device, which is used for a high-sulfur natural gas elbow sulfur particle deposition simulation experimental device, at least includes the following steps:

[0020] Step 1: Connect the gas supply assembly, the gas-solid two-phase flow transport pipe section (19), the sulfur particle feeding assembly, the elbow deposition section assembly, and the emission treatment assembly in sequence, and check the sealing performance between the double-flange pipe (2), the gate valve (6), and the activated carbon adsorption device (27).

[0021] Step 2: Add sulfur particles to the sulfur particle injection device (14) through the sulfur particle filling valve (13). The mass range is 2.0-5.0 kg, and the particle size range is 10-200 μm. Then turn on the micro vibrator (15) to pre-run to verify the fluidity of the sulfur particles, and record the initial sulfur particle weight data.

[0022] Step 3: Start the air compressor (1), adjust the pressure of the gas buffer tank (4) to the target value, which conforms to the pressure tolerance range of ASME BPVC Section VIII, and set the gas flow rate to 1 m / s - 5 m / s through the flow sensor (9).

[0023] Step 4: Adjust the opening and closing size of the knife gate valve (17) to control the sulfur particle injection rate to be 0.5 g / s - 5.0 g / s, and form a stable gas-solid flow field in the gas-solid two-phase flow transport pipe section (19).

[0024] Step 5: Record the particle movement trajectory in the transparent deposition elbow pipe section (20) through the high-speed camera (28), synchronously collect the data of the pressure sensor (8) and the temperature sensor (10), and perform dynamic displacement calibration based on the high-density grid background board (21).

[0025] Step 6: After the experiment is completed, close the gate valve (6) and the knife gate valve (17), disassemble the transparent detachable deposition elbow pipe section (20) and the bag type dust collector (23), weigh the sediment weight by the purge method respectively, analyze the particle size distribution and establish a CFD deposition model;

[0026] Step 7: Open the blowdown port (5) and the gas purge port (12), introduce high-pressure air, purge the experimental device, and reassemble the experimental device for the next experiment;

[0027] Step 8: Repeat Steps 3 to 7 to complete the experimental tests under the combined working conditions of different flow rates, sulfur particle injection rates, pressures, and particle sizes.

[0028] In Step 5, the frame rate of the high-speed camera (28) is ≥1000fps, and the dynamic resolution is ≤1mm;

[0029] In Step 7, the purge time is calculated according to the formula t = 3V / Q, where V is the system volume and Q is the purge gas flow rate. The shortest time is ≥5 minutes, so that the particle concentration at the outlet of the gas vent pipe (26) after purging is ≤0.05g / m 3 , and it is detected according to the ISO 16890 standard whether the bag type dust collector (23) can achieve a particle capture rate of ≥99.5%;

[0030] If the sulfur-containing gas concentration at the outlet of the gas vent pipe (26) exceeds the standard after multiple experiments, the activated carbon filter element needs to be replaced in time.

[0031] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0032] 1. The high-sulfur natural gas pipeline sulfur particle deposition simulation experimental device proposed by the present invention can simulate the dynamic deposition process of sulfur particles under various working conditions such as different flow rates of sulfur particles, different gas flow rates, different sulfur particle sizes, different pipeline pressures, different elbow angles, and different elbow materials, and through the two-stage recovery and double-stage purification scheme of the activated carbon adsorption device, the bag dust collector, and the secondary filter screen, the sulfur particle recovery rate is highly reliable, significantly reducing the danger to the environment and test personnel;

[0033] 2. Through the coupling design of the micro vibrator and the sulfur particle injection device, the blockage problem caused by sulfur particle agglomeration is effectively solved, the frequency of manual intervention is reduced, and the replaceable design of the transparent detachable deposition elbow pipe section enables the device to support rapid switching of pipe types, so as to adapt to the roughness conditions under different particle sizes and meet the experimental requirements of multiple working conditions;

[0034] 3. The high-sulfur natural gas pipeline sulfur particle deposition simulation experimental device proposed by the present invention has the advantages of good experimental repeatability and safe and controllable full process. Description of the Drawings

[0035] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0036] Figure 1 It is a schematic structural diagram of the whole of the present invention;

[0037] Figure 2 It is a top view of the sulfur particle injection device of the present invention;

[0038] Figure 3 It is a partial schematic diagram of the sulfur particle injection device of the present invention;

[0039] Figure 4 It is a side view of the elbow deposition section assembly of the present invention;

[0040] Figure 5 It is a front view of the filter screen of the present invention. Specific embodiments

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0042] Embodiment 1:

[0043] Please refer to Figure 1 , a high-sulfur natural gas elbow sulfur particle deposition simulation experimental device, including a gas supply assembly, a gas-solid two-phase flow migration pipe section (19), a sulfur particle feeding assembly, an elbow deposition section assembly, and an emission treatment assembly. One end of the gas supply assembly is connected to the gas-solid two-phase flow migration pipe section (19). The top of the gas-solid two-phase flow migration pipe section (19) is connected to the sulfur particle feeding assembly. The end of the gas-solid two-phase flow migration pipe section (19) away from the gas supply assembly is equipped with an elbow deposition section assembly. The end of the elbow deposition section assembly away from the gas-solid two-phase flow migration pipe section (19) is equipped with an emission treatment assembly.

[0044] The gas supply assembly includes an air compressor (1), a safety valve (3), a gas buffer tank (4), a gate valve (6) and a Y-type filter (7). One end of the gas buffer tank (4) is provided with an air compressor (1), and the air compressor (1) is connected to the gas buffer tank (4) through a two-way flange pipe (2). A safety valve (3) and a pressure sensor (8) are arranged on the top of the gas buffer tank (4). A drain port (5) is arranged at the bottom end of the gas buffer tank (4). The end of the gas buffer tank (4) far from the air compressor (1) is fixedly connected with an air outlet. The end of the air outlet far from the gas buffer tank (4) is connected to the gas-solid two-phase flow migration pipe section (19) through a gate valve (6) and a Y-type filter (7) in sequence. The opening pressure of the safety valve (3) conforms to the ASME BPVC Section VIII standard and is set to 1.1 times the design pressure of the gas buffer tank (4).

[0045] The front part of the gas-solid two-phase flow migration pipe section (19) is integrated with a pressure sensor (8), a flow sensor (9), a temperature sensor (10) and a flap check valve (11). The pressure sensor (8), the flow sensor (9) and the temperature sensor (10) are used to monitor the gas pressure, flow rate and temperature in real time. The inner wall of the gas-solid two-phase flow migration pipe section (19) is fixed with a replaceable first filter screen (18) through a card slot. The first filter screen (18) is used to intercept large-particle impurities. A gas purge port (12) and another drain port (5) are arranged at the bottom end of the gas-solid two-phase flow migration pipe section (19). The gas purge port (12) is used for purging after the experiment, and the drain port (5) is used for discharging the residues in a directional manner after the experiment. The gas flow rate in the gas-solid two-phase flow migration pipe section (19) is closed-loop controlled by the flow sensor (9).

[0046] Please refer to Figure 2 and Figure 3, the sulfur particle feeding assembly includes a gas purging port (12), a sulfur particle filling valve (13), a sulfur particle injection device (14), a micro vibrator (15), a pressure equalizing filter screen (16) and a knife gate valve (17). The bottom end of the sulfur particle injection device (14) is connected to the gas-solid two-phase flow transport pipe section (19) through the knife gate valve (17). The knife gate valve (17) is used to control the flow rate of sulfur particles transported by the sulfur particle injection device (14) into the gas-solid two-phase flow transport pipe section (19). The opening and closing size of the knife gate valve (17) is manually controlled. One end of the sulfur particle injection device (14) is fixedly connected with a micro vibrator (15), and the micro vibrator (15) is used to optimize the uniformity of particle falling. A pressure equalizing filter screen (16) is arranged at one end of the sulfur particle injection device (14) far away from the micro vibrator (15). The pressure equalizing filter screen (16) is connected to the first filter screen (18) through a pipeline. The pressure equalizing filter screen (16) stabilizes the pressure of the sulfur particle injection device (14) through the pipeline pressure difference compensation mechanism between it and the filter screen (18). The top end of the sulfur particle injection device (14) is fixedly connected with another double flange pipe (2), a gas purging port (12) and a sulfur particle filling valve (13). The bottom end of the other double flange pipe (2) is connected to the gas-solid two-phase flow transport pipe section (19). The sulfur particle filling valve (13) is used for filling sulfur particles.

[0047] Please refer to Figure 4 , the elbow deposition section assembly includes a transparent detachable deposition elbow pipe section (20), a high-density grid background board (21) and a visualization observation window (22). One end of the transparent detachable deposition elbow pipe section (20) is connected to the gas-solid two-phase flow transport pipe section (19). The transparent detachable deposition elbow pipe section (20) is made of a material with a high light transmittance. A high-density grid background board (21) is arranged on one side of the transparent detachable deposition elbow pipe section (20). A visualization observation window (22) is arranged on the other side of the transparent detachable deposition elbow pipe section (20). A high-speed camera (28) is placed at one end of the visualization observation window (22) far away from the transparent detachable deposition elbow pipe section (20). The movement trajectory and deposition distribution of sulfur particles are recorded through the cooperation of the high-density grid background board (21), the visualization observation window (22) and the high-speed camera (28).

[0048] The emission treatment component includes a bag filter (23), a dust collection box (24), a quick-opening baffle (25), a gas vent pipe (26), and an activated carbon adsorption device (27). The other end of the transparent detachable deposition elbow pipe section (20) is equipped with a guiding pipe. The end of the guiding pipe far from the transparent detachable deposition elbow pipe section (20) is connected to the dust collection box (24) and the bag filter (23). A second filter screen (18) is arranged inside the dust collection box (24). A gas vent pipe (26) is arranged at the top of the dust collection box (24) corresponding to the position of the second filter screen (18). The un-deposited gas is discharged through the gas vent pipe (26) after two-stage dust collection by the dust collection box (24) and the bag filter (23). An activated carbon adsorption device (27) is arranged inside the gas vent pipe (26), and the inside of the activated carbon adsorption device (27) is filled with activated carbon filter elements. The activated carbon adsorption device (27) is used to adsorb some sulfur-containing vapors and harmful gases to ensure that the discharged gas meets the emission standards. A quick-opening baffle (25) is arranged at one end of the dust collection box (24) far from the guiding pipe. When the quick-opening baffle (25) is opened, it is used to take out the bag filter (23) from the dust collection box (24) to realize quantitative weighing of the sediment.

[0049] The transparent detachable deposition elbow pipe section (20) is made of polycarbonate material, with a pressure resistance of ≥2 MPa, a light transmittance of ≥90%, and an impact strength of ≥60 kJ / m 2 , and it is applicable to a dynamic pressure environment of 0.1 - 2 MPa. The ratio of the curvature radius to the pipe diameter of the transparent detachable deposition elbow pipe section (20) can be adjusted within 1.2:1 - 2.0:1 according to different experimental requirements;

[0050] The high-density grid background board (21) is a black-and-white high-contrast grid, and the precision of a single grid is 1 mm × 1 mm.

[0051] The pressure equalizing filter screen (16) is a single-layer screen, with a screen aperture of 1 - 2 mm. The pressure equalizing filter screen (16) is installed obliquely, and the inclination angle is 30° to 45°. The pressure equalizing filter screen (16) is used to disperse sulfur particles and balance the pressure difference between the sulfur particle injection device (14) and the gas-solid two-phase flow migration pipe section (19).

[0052] The filtering material of the bag filter (23) is PES, with a filtering efficiency of ≥99.5%. The aperture of the second filter screen (18) is ≤5 μm, which is used for quantitative recovery of un-deposited particles. The dust collection box (24) and the second filter screen (18) are fixed through a snap-fastener structure, supporting quick replacement and cleaning.

[0053] The first filter screen (18) and the second filter screen (18) refer to Figure 5 , and in this embodiment, it is a beveled-edge filter screen. Different meshes of beveled-edge filter screens can be replaced according to experimental needs.

[0054] Example Two:

[0055] Based on the above example, this example proposes a test method for a simulation experiment device of sulfur particle deposition in a high-sulfur natural gas elbow, which is used for the simulation experiment device of sulfur particle deposition in a high-sulfur natural gas elbow, and at least includes the following steps:

[0056] Step 1: Connect the gas supply component, the gas-solid two-phase flow migration pipe section (19), the sulfur particle feeding component, the elbow deposition section component and the emission treatment component in sequence, and check the sealing performance between the double flanged pipe (2), the gate valve (6) and the activated carbon adsorption device (27);

[0057] Step 2: Add sulfur particles to the sulfur particle injection device (14) through the sulfur particle filling valve (13), with a mass range of 2.0 - 5.0 kg and a particle size range of 10 - 200 μm, and turn on the micro vibrator (15) to pre-run to verify the fluidity of the sulfur particles, and record the initial sulfur particle weight data;

[0058] Step 3: Start the air compressor (1), adjust the pressure of the gas buffer tank (4) to the target value, which conforms to the ASME BPVC Section VIII pressure tolerance range, and set the gas flow rate to 1 m / s - 5 m / s through the flow sensor (9);

[0059] Step 4: Adjust the opening and closing size of the knife gate valve (17) to control the sulfur particle injection rate to 0.5 g / s - 5.0 g / s, and form a stable gas-solid flow field in the gas-solid two-phase flow migration pipe section (19);

[0060] Step 5: Record the particle movement trajectory in the transparent deposition elbow pipe section (20) through the high-speed camera (28), synchronously collect the data of the pressure sensor (8) and the temperature sensor (10), and perform dynamic displacement calibration based on the high-density grid background board (21);

[0061] Step 6: After the experiment, close the gate valve (6) and the knife gate valve (17), disassemble the transparent detachable deposition elbow pipe section (20) and the bag type dust collector (23), weigh the sediment weight respectively by the purging method, analyze the particle size distribution and establish a CFD deposition model;

[0062] Step 7: Open the sewage outlet (5) and the gas purging port (12), introduce high-pressure air, purge the experimental device, and reassemble the experimental device for the next experiment;

[0063] Step 8: Repeat Step 3 to Step 7 to complete the experimental combinations of different flow rates, sulfur particle injection rates, pressures and particle sizes.

[0064] In Step 5, the frame rate of the high-speed camera (28) is ≥ 1000 fps, and the dynamic resolution is ≤ 1 mm;

[0065] In Step 7, the purging time is calculated according to the formula t = 3V / Q, where V is the system volume and Q is the purging gas flow rate. The shortest time is ≥ 5 minutes, so that the particle concentration at the outlet of the gas vent pipe (26) after purging is ≤ 0.05 g / m 3 , and it is detected according to the ISO 16890 standard whether the bag filter (23) can achieve a particle capture rate of ≥ 99.5%;

[0066] If the sulfur-containing gas concentration at the outlet of the gas vent pipe (26) exceeds the standard after multiple experiments, the activated carbon filter element needs to be replaced in time.

[0067] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.

Claims

1. Simulation experimental device for sulfur particle deposition in high-sulfur natural gas elbows, characterized in that: It includes a gas supply assembly, a gas-solid two-phase flow transportation pipe section (19), a sulfur particle feeding assembly, a bent pipe deposition section assembly, and an emission treatment assembly. One end of the gas supply assembly is connected to the gas-solid two-phase flow transportation pipe section (19). The top of the gas-solid two-phase flow transportation pipe section (19) is connected to the sulfur particle feeding assembly. A bent pipe deposition section assembly is installed at one end of the gas-solid two-phase flow transportation pipe section (19) away from the gas supply assembly. An emission treatment assembly is installed at one end of the bent pipe deposition section assembly away from the gas-solid two-phase flow transportation pipe section (19).

2. The sulfur particle deposition simulation experimental device for high-sulfur natural gas elbow according to claim 1, characterized in that: The gas supply assembly includes an air compressor (1), a safety valve (3), a gas buffer tank (4), a gate valve (6), and a Y-type filter (7). An air compressor (1) is arranged at one end of the gas buffer tank (4). The air compressor (1) and the gas buffer tank (4) are connected through a two-way flange pipe (2). A safety valve (3) and a pressure sensor (8) are arranged on the top of the gas buffer tank (4). A sewage drain port (5) is arranged at the bottom end of the gas buffer tank (4). An air outlet is fixedly connected to one end of the gas buffer tank (4) away from the air compressor (1). The end of the air outlet away from the gas buffer tank (4) is connected to the gas-solid two-phase flow transportation pipe section (19) through a gate valve (6) and a Y-type filter (7) in sequence. The opening pressure of the safety valve (3) is set to 1.1 times the design pressure of the gas buffer tank (4).

3. The sulfur particle deposition simulation experimental device for high-sulfur natural gas elbow according to claim 2, characterized in that: The front part of the gas-solid two-phase flow transportation pipe section (19) is integrated with a pressure sensor (8), a flow sensor (9), a temperature sensor (10), and a flap check valve (11). The pressure sensor (8), the flow sensor (9), and the temperature sensor (10) are used to monitor the gas pressure, flow rate, and temperature in real time. The inner wall of the gas-solid two-phase flow transportation pipe section (19) is fixed with a replaceable first filter screen (18) through a card slot. The first filter screen (18) is used to intercept large-particle impurities. A gas purge port (12) and another sewage drain port (5) are arranged at the bottom end of the gas-solid two-phase flow transportation pipe section (19). The gas purge port (12) is used for purging after the experiment. The sewage drain port (5) is used to direct the discharge of residues after the experiment. The gas flow rate in the gas-solid two-phase flow transportation pipe section (19) is closed-loop controlled by the flow sensor (9).

4. The high-sulfur natural gas elbow sulfur particle deposition simulation experimental device according to claim 3, wherein: The sulfur particle feeding assembly includes a gas purging port (12), a sulfur particle filling valve (13), a sulfur particle injection device (14), a micro vibrator (15), a pressure equalizing filter screen (16), and a knife gate valve (17). The bottom end of the sulfur particle injection device (14) is connected to the gas-solid two-phase flow migration pipe section (19) through the knife gate valve (17). The knife gate valve (17) is used to control the flow rate of sulfur particles transported by the sulfur particle injection device (14) into the gas-solid two-phase flow migration pipe section (19). The opening and closing size of the knife gate valve (17) is manually controlled. One end of the sulfur particle injection device (14) is fixedly connected with a micro vibrator (15), and the micro vibrator (15) is used to optimize the uniformity of particle falling. A pressure equalizing filter screen (16) is arranged at one end of the sulfur particle injection device (14) away from the micro vibrator (15). The pressure equalizing filter screen (16) is connected to the first filter screen (18) through a pipeline. The pressure equalizing filter screen (16) stabilizes the pressure of the sulfur particle injection device (14) through the pipeline pressure difference compensation mechanism between it and the filter screen (18). The top end of the sulfur particle injection device (14) is fixedly connected with another double flanged pipe (2), a gas purging port (12), and a sulfur particle filling valve (13). The bottom end of the another double flanged pipe (2) is connected to the gas-solid two-phase flow migration pipe section (19). The sulfur particle filling valve (13) is used for filling sulfur particles.

5. The sulfur particle deposition simulation experimental device for high-sulfur natural gas elbows according to claim 4, wherein: The elbow deposition section assembly includes a transparent detachable deposition elbow pipe section (20), a high-density grid background board (21), and a visualization observation window (22). One end of the transparent detachable deposition elbow pipe section (20) is connected to the gas-solid two-phase flow migration pipe section (19). The transparent detachable deposition elbow pipe section (20) is made of a material with a high light transmittance. A high-density grid background board (21) is arranged on one side of the transparent detachable deposition elbow pipe section (20). A visualization observation window (22) is arranged on the other side of the transparent detachable deposition elbow pipe section (20). A high-speed camera (28) is placed at one end of the visualization observation window (22) away from the transparent detachable deposition elbow pipe section (20). The movement trajectory and deposition distribution of sulfur particles are recorded through the cooperation of the high-density grid background board (21), the visualization observation window (22), and the high-speed camera (28).

6. The high-sulfur natural gas elbow sulfur particle deposition simulation experimental device according to claim 5, characterized in that: The emission treatment assembly includes a bag filter (23), a dust collection box (24), a quick-opening baffle (25), a gas vent pipe (26), and an activated carbon adsorption device (27). The other end of the transparent detachable sedimentation elbow pipe section (20) is equipped with a guiding pipe. One end of the guiding pipe away from the transparent detachable sedimentation elbow pipe section (20) is connected to the dust collection box (24) and the bag filter (23). A second filter screen (18) is arranged inside the dust collection box (24). A gas vent pipe (26) is arranged at the top of the dust collection box (24) corresponding to the position of the second filter screen (18). The un-deposited gas is discharged through the gas vent pipe (26) after two-stage dust collection by the dust collection box (24) and the bag filter (23). An activated carbon adsorption device (27) is arranged inside the gas vent pipe (26), and the inside of the activated carbon adsorption device (27) is filled with activated carbon filter elements; the activated carbon adsorption device (27) is used to adsorb some sulfur-containing vapors and harmful gases to ensure that the discharged gas meets the emission standards. A quick-opening baffle (25) is arranged at one end of the dust collection box (24) away from the guiding pipe. When the quick-opening baffle (25) is opened, it is used to take out the bag filter (23) from the dust collection box (24) to realize quantitative weighing of the sediment.

7. The sulfur particle deposition simulation experimental device for high-sulfur natural gas elbow according to claim 5, characterized in that: The transparent detachable sedimentation elbow pipe section (20) is made of polycarbonate material, and the ratio of the curvature radius to the pipe diameter of the transparent detachable sedimentation elbow pipe section (20) is adjustable within 1.2:1 - 2.0:1 according to different experimental requirements; The high-density grid background board (21) is a black-and-white high-contrast grid, and the precision of a single grid is 1mm×1mm.

8. The high-sulfur natural gas elbow sulfur particle deposition simulation experimental device according to claim 4, wherein: The pressure equalizing filter screen (16) is a single-layer screen, the aperture of the screen is 1 - 2mm, the pressure equalizing filter screen (16) is installed obliquely, and the inclined angle is 30° to 45°. The pressure equalizing filter screen (16) is used to disperse sulfur particles and balance the pressure difference between the sulfur particle injection device (14) and the gas-solid two-phase flow migration pipe section (19).

9. The high-sulfur natural gas elbow sulfur particle deposition simulation experimental device according to claim 7, wherein: The filtering material of the bag filter (23) is PES, the aperture of the second filter screen (18) is ≤5μm, which is used for quantitative recovery of un-deposited particles; the dust collection box (24) and the second filter screen (18) are fixed by a snap-fastening structure, which supports quick replacement and cleaning.

10. Testing method for the sulfur particle deposition simulation experimental device of high-sulfur natural gas elbow, for the high-sulfur natural gas elbow sulfur particle deposition simulation experimental device according to any one of claims 1-9, characterized in that: At least includes the following steps: Step 1: Connect the gas supply assembly, the gas-solid two-phase flow migration pipe section (19), the sulfur particle feeding assembly, the elbow sedimentation section assembly, and the emission treatment assembly in sequence, and check the sealing performance between the double-flange pipe (2), the gate valve (6), and the activated carbon adsorption device (27); Step 2: Add sulfur particles to the sulfur particle injection device (14) through the sulfur particle filling valve (13), the mass range of which is 2.0 - 5.0 kg, the particle size range is 10 - 200 μm, and start the micro-vibrator (15) to pre-run to verify the fluidity of the sulfur particles, and record the initial sulfur particle weight data; Step 3: Start the air compressor (1), adjust the pressure of the gas buffer tank (4) to the target value, which conforms to the pressure tolerance range of ASME BPVC Section VIII, and set the gas flow rate to 1 m / s - 5 m / s through the flow sensor (9); Step 4: Adjust the opening and closing size of the knife gate valve (17) to control the sulfur particle injection rate to 0.5 g / s - 5.0 g / s, and form a stable gas-solid flow field in the gas-solid two-phase flow migration pipe section (19); Step 5: Record the particle movement trajectory in the transparent deposition elbow pipe section (20) through the high-speed camera (28), synchronously collect the data of the pressure sensor (8) and the temperature sensor (10), and perform dynamic displacement calibration based on the high-density grid background board (21); Step 6: After the experiment is over, close the gate valve (6) and the knife gate valve (17), disassemble the transparent detachable deposition elbow pipe section (20) and the bag type dust collector (23), weigh the sediment weight respectively by the purging method, analyze the particle size distribution and establish a CFD deposition model; Step 7: Open the drain port (5) and the gas purge port (12), introduce high-pressure air, purge the experimental device, and reassemble the experimental device for the next experiment; Step 8: Repeat Steps 3 to 7 to complete the experimental tests of combined working conditions with different flow rates, sulfur particle injection rates, pressures and particle sizes.

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