[0031] The invention provides a multiphase flow corrosion and flow pattern simulation experiment pipeline device, which includes a pipeline, a support, a corrosion-resistant storage tank, a corrosion-resistant pump, a ball valve, an electromagnetic flowmeter, a resistance probe, a thermometer, a pH meter, A dissolved oxygen meter and a high-speed camera, the pipeline includes an undulating pipeline corrosion test area and a horizontal pipeline corrosion test area.
[0032] A resistance probe is installed at each inclination angle of the corrugated pipeline corrosion test area to monitor the corrosion behavior at different inclination angles in real time. The resistance probe is set flush with the pipe wall of the pipeline.
[0033] The corrosion-resistant storage tank has a gas inlet at the bottom and a gas outlet at the top, an experimental liquid inlet on the upper side wall of the corrosion-resistant storage tank, and an experimental liquid outlet on the lower side wall. The gas inlet and gas outlet are connected to the corrosion-resistant storage tank. On the can.
[0034] Further, the gas inlet and the gas outlet are connected to the corrosion-resistant storage tank by using ball valves.
[0035] A thermometer, a pH meter and a dissolved oxygen meter are also installed at the bottom of the corrosion-resistant storage tank. The thermometer is used to measure the temperature of the experimental medium, the pH meter is used to measure the pH value of the experimental medium, and the dissolved oxygen meter is used to measure the dissolved oxygen of the experimental medium. The amount of oxygen.
[0036] The corrosion-resistant pump is installed on the pipeline and connected to the corrosion-resistant storage tank through a ball valve. The electromagnetic flowmeter is used to display the flow rate of the pipeline and is connected to the corrosion-resistant pump through the pipeline.
[0037] The inclination angle of the undulating pipeline corrosion test area can be adjusted through the connection between PVC pipe sections of different lengths to obtain an inclination angle within 0-90 degrees, showing horizontal, inclined and vertical flow states.
[0038] The horizontal part of the PVC pipe in the entire pipeline is connected by flanges, and the angled parts are connected by elbows.
[0039] The horizontal pipeline corrosion test area is composed of a main pipe and a bypass. Ball valves are installed on the bypass and the main pipe. The ball valve can control the path of the test liquid flowing through the pipeline.
[0040] The experimental pipeline is made of PVC pipe with a diameter of 10cm. The length of each pipeline can be adjusted according to the limitations of the experimental site and the needs of the inclination setting in the experiment. The entire pipeline system is perpendicular to the ground and is fixed by a bracket.
[0041] The sample in the main pipe of the horizontal pipeline corrosion test area uses a ring sample with the same inner diameter as the pipe, and O-rings are used for insulation between the samples. The ring sample can be used for weightlessness test and electrochemical test, and corresponds to the sample on the main pipe. Holes are drilled in the part, and stainless steel screws are used to contact the sample to derive the electrical signal of the sample. The adjacent sample is used as a reference electrode, and the electrochemical signal of the sample is tested one by one using a two-electrode system.
[0042] The corrosion-resistant storage tank is equipped with an electric heating tube and a thermocouple, which can maintain the constant temperature of the medium in the tank according to the set temperature.
[0043] The high-speed camera observes the flow patterns in different parts of the pipeline.
[0044] The present invention also provides a method for performing a simulation experiment using the above-mentioned multiphase flow corrosion and flow simulation experiment pipeline device, which is specifically:
[0045] The first step is to add the test solution medium to the corrosion-resistant storage tank 1. The volume of the solution is about 1/2 to 2/3 of the total volume of the corrosion-resistant storage tank 1. If a system containing sand is simulated, sand should be added;
[0046] The second step is to deoxygenate the simulation experiment pipeline device;
[0047] In the third step, when the oxygen removal capacity in the second step reaches the requirement, close the second ball valve 16 on the pipeline bypass of the horizontal pipeline corrosion test area, open the third ball valve 17 and the fourth ball valve 19 on the main pipeline, and open the corrosion resistance The pump 3 makes the experimental solution medium in the corrosion-resistant storage tank 1 flow in the pipeline, and the flow rate of the experimental solution medium is measured by the electromagnetic flowmeter 4, and the flow state of different parts in the pipeline is observed by a high-speed camera;
[0048] In the fourth step, after the experiment, close the corrosion resistant pump 3, the first ball valve 2, the second ball valve 16, the third ball valve 17 and the fourth ball valve 19, and remove the corrosive samples of the undulating pipe part and the horizontal pipe part.
[0049] The second step further specifically includes opening the gas inlet 8, filling the corrosion-resistant storage tank 1 with non-oxygen gas, such as nitrogen, from the gas inlet 8 through the booster pump, opening the gas outlet 11 and the first ball valve 2, using dissolved oxygen The meter 7 measures the dissolved oxygen content of the experimental medium. When the deoxygenation amount reaches the requirement, close the ball valve of the gas outlet 11, and fill the experimental solution medium with the experimental gas from the gas inlet 8 to complete the gas filling after reaching the experimental pressure, and adopt pH Meter 6 test solution pH value.
[0050] The invention provides a pipeline device capable of simulating multiphase flow corrosion and flow patterns and a simulation experiment method. The device is designed with a transparent PVC experimental pipeline system, which is convenient to observe the flow pattern changes in the pipeline, and simulates the fluctuating pipe by designing different inclination angles Road; the horizontal pipe section adopts a ring-shaped sample with the same internal diameter as the pipe, which is convenient for loading and unloading and use. It can truly simulate the flow state of the industrial site and the multiphase flow corrosion experiment pipeline system, which is suitable for studying gas, liquid and solid Corrosion behavior and flow pattern of multiphase flow in pipelines in granular environment, such as multiphase flow corrosion and flow pattern simulation study of oil and gas transportation systems, multiphase flow corrosion and flow pattern simulation study of pipelines of oil refinery equipment, corrosion inhibitors inside pipelines Performance evaluation, corrosion inhibitor treatment process evaluation and pipeline internal coating screening, etc.
[0051] The following examples are used to describe the implementation of the present invention in detail, so as to fully understand how the present invention applies technical means to solve technical problems and achieve the realization process of technical effects and implement them accordingly.
[0052] Such as figure 1 with figure 2 As shown, the multiphase flow corrosion and flow simulation experiment pipeline device provided by the present invention includes pipelines, brackets, corrosion-resistant storage tank 1, corrosion-resistant pump 3, first ball valve 2, second ball valve 16, and third ball valve 17 and fourth ball valve 19, electromagnetic flowmeter 4, resistance probe 12-15, thermometer 5, pH meter 6, dissolved oxygen meter 7, high-speed camera, the pipeline includes undulating pipeline corrosion test area and horizontal pipeline In the corrosion test area, resistance probes 12-15 are installed at the inclination of the undulating pipeline corrosion test area to monitor the corrosion behavior at different inclination angles in real time. The resistance probes are set flush with the pipe wall of the pipeline. The storage tank has a gas inlet 8 at the bottom and a gas outlet 11 at the top. There is an experimental liquid inlet 10 on the upper side wall of the corrosion-resistant storage tank, and an experimental liquid outlet 9 on the lower side wall. The gas inlet 8 and the gas outlet 11 respectively pass The ball valve is connected to the corrosion-resistant storage tank 1. A thermometer 5, a pH meter 6 and a dissolved oxygen meter 7 are also installed at the bottom of the corrosion-resistant storage tank 1. The thermometer 5 is used to measure the temperature of the experimental medium, and the pH meter 6 is used to measure the experiment. The pH value of the medium, the dissolved oxygen meter 7 is used to measure the dissolved oxygen content of the experimental medium, the corrosion-resistant pump 3 is installed on the pipeline, and is connected to the corrosion-resistant storage tank 1 through the first ball valve 2, and the electromagnetic flowmeter 4 is used for Shows the flow of the pipeline, which is connected to the corrosion-resistant pump 3 through the pipeline. The inclination of the pipeline in the corrosion test area of the undulating pipeline can be adjusted through the connection between the PVC pipe sections of different lengths to obtain an inclination within 0-90 degrees , Showing horizontal, inclined and vertical flow conditions. The horizontal part of the PVC pipe in the whole pipeline adopts flange connection, and the inclined part adopts elbow connection. The horizontal pipeline corrosion test area is composed of main pipe and bypass. The second ball valve 16, the third ball valve 17, and the fourth ball valve 19 are set on the bypass and the main pipe respectively. The ball valve can control the path of the experimental liquid flowing through the pipeline. The experimental pipeline is made of PVC pipe with a diameter of 10cm and the length of each pipeline. It can be adjusted according to the limitation of the experimental site and the inclination setting in the experiment. The entire pipeline system is vertical to the ground and fixed by brackets. The sample in the main pipeline in the horizontal pipeline corrosion test area uses the same ring sample as the inner diameter of the pipeline. 20 , 22, O-rings 21 and 23 are used for insulation between the samples. The ring-shaped sample can be used for weightlessness test and electrochemical test. Holes are punched in the main pipe road and the corresponding part of the sample, and stainless steel screws 24 and 25 are used to contact the sample. , The electrical signal of the sample is derived, the adjacent sample is used as the reference electrode, and the electrochemical signal of the sample is tested one by one using a two-electrode system. The corrosion-resistant storage tank 1 is equipped with an electric heating tube and a thermocouple, which can be set according to the temperature Keep the medium in the tank at a constant temperature, and the high-speed camera observes the flow patterns in different parts of the pipeline.
[0053] The present invention also provides a method for performing a simulation experiment using the above-mentioned multiphase flow corrosion and flow simulation experiment pipeline device, specifically adding the experimental solution medium in the corrosion-resistant storage tank 1, and the volume of the solution is about the total volume of the corrosion-resistant storage tank 1. 1/2 to 2/3 of the volume. If simulating a system containing sand, sand should be added; open the gas inlet 8, and fill the corrosion-resistant storage tank 1 with non-oxygen gas, such as nitrogen, from the gas inlet 8 through the booster pump. Open the gas outlet 11 and the first ball valve 2, and use the dissolved oxygen meter 7 to measure the dissolved oxygen content of the experimental medium. When the deoxygenation amount reaches the requirement, close the ball valve of the gas outlet 11, and charge the experimental solution medium from the gas inlet 8 to the experiment Use gas to complete the inflation after reaching the experimental pressure, and use the pH meter 6 to test the pH value of the solution; close the second ball valve 16 on the pipeline bypass of the horizontal pipeline corrosion test area, and open the third ball valve 17 and the fourth ball valve on the main line 19. Turn on the corrosion-resistant pump 3 to make the experimental solution medium in the corrosion-resistant storage tank 1 flow in the pipeline, measure the flow of the experimental solution medium through the electromagnetic flowmeter 4, and use a high-speed camera to observe the flow patterns in different parts of the pipeline; After finishing, close the corrosion resistant pump 3, ball valve 2, ball valve 16, ball valve 17 and ball valve 19, and disassemble the corroded samples of the undulating pipeline part and the horizontal pipeline part.
[0054] All of the above-mentioned primary implementations of this intellectual property have not set restrictions on other forms of implementation of this new product and/or new method. Those skilled in the art will use this important information and modify the above content to achieve a similar implementation. However, all modifications or transformations based on the new products of the present invention belong to the reserved rights.
[0055] The above are only preferred embodiments of the present invention, and are not intended to limit the present invention in other forms. Anyone familiar with the profession may use the technical content disclosed above to change or modify the equivalent of equivalent changes. Examples. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still belong to the protection scope of the technical solution of the present invention.
