CN110542649A - Multifunctional liquid single-phase flow flowing corrosion testing loop - Google Patents
Multifunctional liquid single-phase flow flowing corrosion testing loop Download PDFInfo
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Abstract
The invention discloses a multifunctional liquid single-phase flow flowing corrosion testing loop. The corrosion test device comprises a liquid storage tank provided with a temperature detection and control device, wherein liquid in the tank is filled with nontoxic corrosive gas through a high-pressure gas cylinder to form liquid saturated with certain corrosive gas, the outlet of the liquid storage tank is connected with a variable-frequency centrifugal pump, the liquid enters a corrosion test section after being pressurized, a horizontal section can be selected for corrosion test, the liquid is measured by a flowmeter and returns to the liquid storage tank, and one section of horizontal straight pipe can be replaced by a parallel reducer pipe to simultaneously test the corrosion conditions of three pipe diameters; or the corrosion test can be carried out by selecting an up-slope and down-slope test section, and the corrosion test is carried out and the corrosion test is measured by a flowmeter and returned to the liquid storage tank. The invention has simple structure and easy installation, can carry out corrosion test experiments under the industrial pipe flows under various working conditions, and provides theoretical basis and support for corrosion prediction and protection, risk inspection, safety evaluation and service life prediction of petrochemical pipelines.
Description
Technical Field
The invention relates to a corrosion testing device, in particular to a multifunctional liquid single-phase flow flowing corrosion testing loop for petrochemical industry.
Background
The damage and harm caused by corrosion in the pipeline are manifold, which not only causes huge economic loss and causes various catastrophic accidents, but also consumes a large amount of precious and limited resources and energy, seriously pollutes the environment and threatens the survival and development of human beings to a certain extent. For example: in chemical and petroleum areas near the sea, the corrosion problem is particularly serious, and the normal production is directly influenced. Because of the large amount of corrosive ions in the seawater and the reduction and destruction of the protective layer on the surface of the metal material in the partial flow area due to the disturbance of the fluid, the corrosion of the material under various factors becomes more complicated and serious. If the fluid system has a second phase or a third phase (solid particles or bubbles generated in the system) in the flowing process of the liquid, the participating phases can break the original state, and the erosion system is corroded more. In actual production, the electrochemical corrosion damage is more serious, which greatly shortens the service life of equipment, seriously affects the production efficiency, and arouses high attention of people on the research of fluid-induced electrochemical corrosion. Therefore, the research on the electrochemical corrosion behavior aiming at the fluid flow characteristics is very important.
The CO2 content in most oil fields in China is high, for example, the CO2 content of some structures of the oil fields in North China reaches 20-40% (volume fraction); the content of CO2 in the gas field gas of the victory oil field part is 12 percent (volume fraction); the content of CO2 in the gas field gas of the south sea oil field cliff 13-1 block reaches 10 percent (volume fraction); the content of CO2 in the Changqing oil field part block is 4-6% (volume fraction). Since during oil and gas production there is often a large production of water, which often contains some iron, magnesium, calcium ions, etc., they tend to form some carbonates with CO 2. The generated carbonate is deposited on the inner wall of the oil well pipe for a long time, so that the blockage phenomenon can occur in the oil well pipe, if dirt in the pipe is not timely and regularly removed for a long time, the local corrosion can occur in the oil well pipe under the serious condition, and the normal production of an oil-gas field is influenced. For example: since 58 blocks of the North China oil field are exploited from 4 months in 1984 to 7 months in 1985, 3 high-yield wells are scrapped due to corrosion of CO2 on oil pipes and casings, and tens of millions of yuan is directly lost economically; after the Jilin dehui CO2 gas field well is tested and put into operation in 1985, gas production is abnormal in 1988, and oil pipes are found to be corroded and broken at the well depth of more than 300 meters during well workover, so that a large number of corrosion pits are formed at the broken surface.
Aiming at the corrosion problem existing in the field of coal chemical industry and petrochemical industry transportation at present, the corrosion mechanism of the pipeline is further researched, a series of corrosion test devices are designed by some scientific research institutes, and the corrosion mechanism of the pipeline is researched by a test research means so as to predict the corrosion rate of the pipeline. However, the existing corrosion test devices have some disadvantages mainly in that the average corrosion rate of the conventional corrosion test devices is often measured by a weighing or thickness measuring method, the fluid flow cannot be coupled with the electrochemical corrosion, and the transient characteristics can be tested and researched. At present, the test time of related equipment is long, and the experimental result is difficult to popularize and apply in engineering
Disclosure of Invention
Aiming at the problems in the background technology and the defects of domestic and foreign corrosion experiment devices, the invention aims to provide a multifunctional liquid single-phase flow flowing corrosion test loop device which can perform single-phase flow circulating flow and simultaneously realize various experiment flows, online sampling, strong functionality, high variability, simple flow and flexible and convenient operation. The method is suitable for corrosion mechanism of corrosion and flow coupling action, simulation analysis of fluid dynamics, research of action effect and action mechanism of the corrosion inhibitor, prediction of corrosion of industrial pipelines and the like.
In order to achieve the purpose, the technical scheme adopted by the design is as follows: a multifunctional liquid single-phase flow flowing corrosion testing loop device comprises a liquid storage tank, a tank top pressure gauge, a temperature detecting and controlling device, a tank top vent valve, a high-pressure gas cylinder, a gas cylinder vent valve, a gas cylinder control valve, a connecting hose, an outlet control valve, a variable-frequency motor, a variable-frequency centrifugal pump, an outlet flow control valve, a first pressure gauge, a thermometer, a first tee joint, a first gate valve, a first polytetrafluoroethylene horizontal elbow testing section, a polytetrafluoroethylene horizontal straight pipe testing section, a first flange, a straight pipe replacing section, a second flange, a first check valve, a second tee joint, an electromagnetic flowmeter, a liquid storage tank inlet valve, a second gate valve, a second pressure gauge, a first expansion hose, a first polytetrafluoroethylene upward slope elbow testing section, a second polytetrafluoroethylene upward slope straight pipe testing section, a third polytetrafluoroethylene upward slope elbow testing section, a first polytetrafluoroethylene downward slope elbow testing section, a second polytetrafluoroethylene downward slope elbow testing section, a third polytetrafluoroethylene, A second flexible pipe, a fourth pressure gauge, a check valve and a movable support frame; the top of the high-pressure gas cylinder is provided with an air release valve and a control valve, and is connected to a liquid storage tank by a hose, the top of the liquid storage tank is provided with a pressure gauge and an air release valve, a temperature detection and control device is arranged in the liquid storage tank, the outlet of the liquid storage tank is connected with a variable frequency centrifugal pump, the variable frequency centrifugal pump is controlled by a variable frequency motor, fluid enters a tee joint I after being pressurized, the outlet of the tee joint I is divided into two paths, one path is controlled by a gate valve I and passes through a polytetrafluoroethylene horizontal elbow testing section and a polytetrafluoroethylene horizontal straight pipe testing section and then enters a replacement pipe section, the replacement pipe section can be directly replaced by; one path is controlled by a gate valve and the other path is controlled by a gate valve and then enters an up-slope and down-slope testing section and then returns to the liquid storage tank after being measured by an electromagnetic flowmeter.
The replacement pipe section is connected with the main pipeline by a flange and is easy to disassemble and replace, and the replacement pipe section can be replaced by a parallel reducing pipeline testing section; wherein the parallelly connected reducing pipeline test section contains the polytetrafluoroethylene test tube section of three kinds of different pipe diameters, selects the test pipe diameter through the switching of adjustment ooff valve, can accomplish the corrosion test of three kinds of different pipe diameters simultaneously.
the polytetrafluoroethylene test section is longitudinally and equidistantly provided with electrochemical test sensors, and the electrochemical test sensors are arranged in four directions of twelve o 'clock, three o' clock, six o 'clock and nine o' clock on the cross section.
The ascending section and the descending section are connected with the horizontal pipeline through flexible hoses, the horizontal straight pipe section is supported through a movable support frame, and the position of the movable support frame is adjusted front and back to change the inclination angle of the ascending and descending.
The high-pressure gas cylinder is provided with an emptying valve, and gas is filled into the liquid in the liquid storage tank through the control valve, so that the liquid can be saturated, and the corrosion condition of different media contained in the liquid can be tested.
A temperature detection and control device is arranged in the liquid storage tank, the temperature of the liquid is adjusted according to the working condition, and a pressure gauge and an emptying valve of the liquid storage tank ensure the safety of the liquid storage tank; the loop is provided with an electromagnetic flowmeter, a pressure gauge and a thermometer for monitoring temperature, pressure and flow on line, the centrifugal pump has a frequency conversion speed regulation function, and the rotating speed and the lift are controlled in real time through a frequency conversion motor.
The invention has the beneficial effects that: the device provided by the invention realizes actual real simulation working conditions of the test pipeline in an industrial environment, can simultaneously test corrosion conditions of a bent pipe, a straight pipe, different pipe diameters and a bent section, can detect the corrosion transient characteristics of materials in real time, and can study the electrochemical corrosion rule of a single-phase flow corrosion action pipeline system under the actual working conditions.
The invention can simulate liquid phase fluid containing corrosive media such as O2, CO2 and the like, and carry out failure research of corrosion damage, corrosion prediction, optimization design, risk inspection, safety evaluation, life prediction and other safety guarantee technical research on pipeline and tube bundle equipment on a series of actual engineering corrosion failure cases such as pipelines and the like in a flowing state. In addition, the invention has simple structure, and all the pipe fittings and equipment are connected by flanges and are easy to disassemble, maintain and replace.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of a variable diameter test tube segment according to the present invention
FIG. 3 is a schematic cross-sectional view of a PTFE test block apparatus according to the present invention
FIG. 4 is a schematic longitudinal section view of a PTFE test section apparatus according to the present invention
In the figure: comprises 1, a liquid storage tank top, 2, a pressure gauge, 3, a temperature detection and control device, 4, a tank top vent valve, 5, a high-pressure gas cylinder, 6, a gas cylinder vent valve, 7, a gas cylinder control valve, 8, a connecting hose, 9, an outlet control valve, 10, a variable-frequency motor, 11, a variable-frequency centrifugal pump, 12, an outlet flow control valve, 13, a first pressure gauge, 14, a thermometer, 15, a tee joint I, 16, a gate valve I, 17, a polytetrafluoroethylene horizontal elbow test section, 18, a polytetrafluoroethylene horizontal straight pipe test section, 19, a flange I, 20, a straight pipe replacement section, 21, a flange II, 22, a check valve I, 23, a tee joint II, 24, an electromagnetic flowmeter, 25, a liquid storage tank, 26, a gate valve II, 27, a second pressure gauge, 28, a flexible hose I, 29, a polytetrafluoroethylene upward slope elbow test section I, 30, a polytetrafluoroethylene upward slope test section, 31, a polytetrafluoroethylene upward slope elbow test section II, 32. the device comprises a third pressure gauge 33, a first polytetrafluoroethylene downhill elbow testing section 34, a second polytetrafluoroethylene downhill elbow testing section 35, a second polytetrafluoroethylene downhill elbow testing section 36, a second expansion hose 37, a fourth pressure gauge 38, a check valve 39, a movable support frame 40, a third flange 41, a first switch valve 42, a first polytetrafluoroethylene variable diameter testing section 43, a second switch valve 44, a fourth flange 45, a third switch valve 46, a second polytetrafluoroethylene variable diameter testing section 47, a fourth switch valve 48, a fifth switch valve 49, a second polytetrafluoroethylene variable diameter testing section 50, a second switch valve 50 and testing holes 51-57.
Detailed Description
The invention is further illustrated by the following figures and examples.
As shown in FIG. 1, the concrete implementation of the invention comprises a liquid storage tank 1, a tank top pressure gauge 2, a temperature detection and control device 3, a tank top vent valve 4, a high-pressure gas cylinder 5, a gas cylinder vent valve 6, a gas cylinder control valve 7, a connecting hose 8, an outlet control valve 9, a variable-frequency motor 10, a variable-frequency centrifugal pump 11, an outlet flow control valve 12, a first pressure gauge 13, a thermometer 14, a tee junction I15, a gate valve I16, a polytetrafluoroethylene horizontal elbow test section 17, a polytetrafluoroethylene horizontal straight pipe test section 18, a flange I19, a straight pipe replacement section 20, a flange II 21, a check valve I22, a tee junction II 23, an electromagnetic flowmeter 24, a liquid storage tank inlet valve 25, a gate valve II 26, a second 27, a flexible hose I28, a polytetrafluoroethylene upward slope elbow test section I29, a polytetrafluoroethylene upward slope straight pipe test section 30, a polytetrafluoroethylene upward slope elbow test section II 31, a third pressure gauge 32, a polytetrafluoroethylene elbow test section I33, a polytetrafluoroethylene downhill straight pipe testing section 34, a polytetrafluoroethylene downhill elbow testing section II 35, a flexible hose II 36, a fourth pressure gauge 37, a check valve 38 and a movable supporting frame 39; the top of a high-pressure gas cylinder 5 is provided with an air release valve 6 and a control valve 7, and is connected to a liquid storage tank 1 by a hose 8, the top of the liquid storage tank 1 is provided with a pressure gauge 2 and an air release valve 4, a temperature detection and control device 3 is arranged in the tank, the outlet of the liquid storage tank 1 is connected with a variable frequency centrifugal pump 11, the variable frequency centrifugal pump 11 is controlled by a variable frequency motor 10, fluid enters a tee joint I15 after being pressurized, the outlet of the tee joint I15 is divided into two paths, one path is controlled by a gate valve I16, the fluid enters a replacement pipe section 20 after passing through a polytetrafluoroethylene horizontal elbow testing section 17 and a polytetrafluoroethylene horizontal straight pipe testing section 18, the replacement pipe section 20 can be directly replaced by a parallel reducing; one path is controlled by a gate valve II 26, enters an up-down slope testing section, is metered by an electromagnetic flowmeter 24 and returns to the liquid storage tank 1.
The replacement pipe section 20 is connected with the main pipeline by flanges 19 and 21 and is easy to disassemble and replace, and the replacement pipe section 20 can be replaced by a parallel reducing pipeline testing section; the parallel reducing pipeline testing section comprises three polytetrafluoroethylene testing pipe sections 42, 46 and 49 with different pipe diameters, and the testing pipe diameters are selected by adjusting the opening and closing of the switch valves 41, 43, 45, 47, 48 and 50, so that corrosion tests of the three different pipe diameters can be simultaneously completed.
The ascending section and the descending section are connected with the horizontal pipeline by adopting telescopic hoses 28 and 36, the horizontal straight pipe section is supported by adopting a movable support frame 39, and the inclination angle of the ascending and the descending is changed by adjusting the position of the movable support frame 39 back and forth.
The high-pressure gas bottle 5 is provided with an air release valve 6, gas is filled into the liquid in the liquid storage tank 1 through a control valve 7, the liquid can be saturated, and the corrosion condition of different media contained in the liquid can be tested.
A temperature detection and control device 3 is arranged in the liquid storage tank 1, the temperature of the liquid is adjusted according to the working condition, and a pressure gauge 2 and an emptying valve 4 are arranged in the liquid storage tank 1 to ensure the safety of the liquid storage tank 1; the loop is provided with an electromagnetic flowmeter 24, pressure gauges 13, 27, 32 and 37 and a thermometer 14 for monitoring temperature, pressure and flow on line, the centrifugal pump 11 has a frequency conversion speed regulation function, and the rotating speed and the lift are controlled in real time through a frequency conversion motor 10.
Working principle of the invention
As shown in figure 1, a multifunctional liquid single-phase flow flowing corrosion test loop is installed, before an experiment, a liquid storage tank 1 is filled with liquid, the liquid level height is controlled to be 4/5 of the liquid storage tank, then a temperature detection and control device 3, a variable frequency motor 10 and an outlet flow control valve 12 are adjusted according to conditions required by the experiment, and a test path is selected according to the opening and closing of a selected gate valve.
If only the horizontal pipe section is used for testing, the outlet control valve 9, the inlet control valve 25 and the first gate valve 16 of the liquid storage tank are opened, liquid is heated to a preset temperature in the liquid storage tank 1 through the temperature detection and control device, the variable frequency centrifugal pump 11 is started to pressurize, the pressurized liquid is detected through the first pressure gauge 13 and the thermometer 14 and then enters the first tee joint 15, and the liquid enters the electromagnetic flowmeter to be metered back to the liquid storage tank 1 after passing through the polytetrafluoroethylene horizontal elbow testing section 17 and the polytetrafluoroethylene horizontal straight pipe testing section 18 due to the fact that the first gate valve 16 is opened.
If only the up-down slope section is tested, the outlet control valve 9, the inlet control valve 25 and the gate valve II 26 of the liquid storage tank are opened, liquid is heated to a preset temperature in the liquid storage tank 1 through a temperature detection and control device, the variable frequency centrifugal pump 11 is started to pressurize, the pressurized liquid is detected through the first pressure gauge 13 and the thermometer 14 and then enters the tee joint I15, the gate valve II 26 is opened, the liquid enters the up-slope polytetrafluoroethylene testing section 29-31 after being measured through the second pressure gauge 27, enters the down-slope polytetrafluoroethylene testing section 33-35 after being measured through the third pressure gauge 32, enters the electromagnetic flowmeter 24 after being measured through the fourth pressure gauge and returns to the liquid storage tank 1.
If the industrial needs exist, two paths can be tested simultaneously, an outlet control valve 9, an inlet control valve 25, a first gate valve 16 and a second gate valve 26 of the liquid storage tank are opened, liquid is heated to a preset temperature in the liquid storage tank 1 through a temperature detection and control device, a variable frequency centrifugal pump 11 is started to pressurize, the pressurized liquid enters a first tee joint 15 after being detected through a first pressure gauge 13 and a thermometer 14, the liquid flows in two paths because the first gate valve and the second gate valve 26 are opened simultaneously, one path of the liquid flows through a horizontal pipe section, and the liquid flows to a second tee joint 23 after being tested through a polytetrafluoroethylene horizontal elbow testing section 17 and a polytetrafluoroethylene horizontal straight pipe testing section 18; one path of the polytetrafluoroethylene is measured by a second pressure gauge 27 and then enters an ascending polytetrafluoroethylene test section 29-31, is measured by a third pressure gauge 32 and then enters a descending polytetrafluoroethylene test section 33-35, and flows to a second tee 23 after being measured by a fourth pressure gauge; the two paths of fluid are converged at the second tee joint 23, enter an electromagnetic flow meter 24 and are measured to return to the liquid storage tank 1.
The replacement pipe section 20 is connected with the main pipeline by flanges 19 and 21 and is easy to disassemble and replace, and the replacement pipe section 20 can be replaced by a parallel reducing pipeline testing section; the parallel reducing pipeline testing section comprises three polytetrafluoroethylene testing pipe sections 42, 46 and 49 with different pipe diameters, the testing pipe diameter is selected by adjusting the opening and closing of the switch valves 41, 43, 45, 47, 48 and 50, for example, only the switch valves 41 and 43 are opened to test the reducing section 42, the switch valves 41, 43, 45 and 47 are opened to test the reducing section 42 and 46, the switch valves 41, 43, 45, 47, 48 and 50 are opened simultaneously, and the reducing section 42, 46 and 49 are tested; after the device is installed, the first gate valve 16 and the second gate valve 26 are controlled to select a testing path according to the method.
In order to test the transient characteristic of the flow corrosion on line, the invention adopts an electrochemical on-line test sensor, monitors the electrochemical characteristic of the corrosion product protective film in time, and captures the critical state of the corrosion product protective film, which is mutated, through calculation and analysis.
The polytetrafluoroethylene test sections 17-18, 29-31, 33-35, 42, 46 and 49 are provided with electrochemical test sensors 55-57 which are arranged at equal intervals, and the electrochemical test sensors are arranged at four directions of twelve o 'clock 51, three o' clock 52, six o 'clock 53 and nine o' clock 54 on the cross section.
In the specific implementation of the invention, the actual corrosion medium is adopted and the temperature, pressure and flow control regulating system is utilized to simulate the actual working state. The function realization process of the experimental device comprises the following steps of air tightness test, system deoxygenation, temperature regulation, pressure regulation, liquid preparation, electrochemical sensor pre-corrosion process and experiment.
And (3) air tightness test: the air tightness test is to ensure the stability of the pressure and the medium content of the system and the safety of the test and to test the air tightness of the test device before the test. All outlet valves are closed, nitrogen is introduced into the liquid storage tank to 10kgf cm < -2 > through the high-pressure gas cylinder, all possible leakage points are checked by using soapy water, after pressure maintaining is carried out for hours, the leakage points are discharged to normal pressure, 4/5 volumes of water are added into the liquid storage tank 1, and the airtightness is checked by adopting the same method after nitrogen is introduced into the liquid storage tank to 1kgf cm < -2 >.
Deoxidizing the device: in order to ensure that the experiment has no environmental oxygen interference, after the air tightness is qualified, the high-pressure gas cylinder 5 is continuously filled with nitrogen to increase the pressure of the ring channel to 10kgf cm < -2 >, and then the pressure is released to the normal pressure, and the process is repeated for 5 times. Then, distilled water was added into the liquid storage tank 1, heated to 60 ℃, and nitrogen was filled from the bottom of the liquid storage tank 1 until the pressure in the loop system became 5kgf cm-2, and the pressure in the loop system was released to normal pressure, and this was repeated 10 times, and it was considered that the test loop was in an oxygen-free state at this time.
Temperature regulation: the temperature is regulated by the temperature detection and control device, when the temperature rises to a specified value, the heating is stopped, and after the temperature is reduced, the heating is automatically carried out, so that the temperature control process is realized.
Pressure regulation: the rotating speed of the data variable frequency motor is detected through the pressure gauge, so that the lift of the variable frequency centrifugal pump is adjusted, and the fluid pressure is controlled.
Solution preparation: in the test, two sets of experimental schemes are planned, wherein the schemes are always connected with the experiment of taking back materials in industrial production and entering an experimental device for experiment, but whether the materials meet the experimental safety requirements or not needs to be considered; solution is prepared automatically, if the solution contains salt ions, the experimental liquid is prepared according to the concentration requirement and added into a liquid storage tank, and if the liquid is saturated with certain corrosive gas, the liquid can be continuously introduced into the liquid storage tank through a high-pressure gas cylinder.
Pre-corrosion process of the electrochemical sensor: firstly, polishing the to-be-detected surface of the pre-filming probe to 800# step by using water sand paper, washing the to-be-detected surface by using acetone and deionized water, scrubbing the to-be-detected surface by using absolute ethyl alcohol, drying the to-be-detected surface by using cold air, putting the to-be-detected surface into a dryer, mounting the pre-filming probe onto a pre-filming device after drying, accurately positioning the pre-filming probe during mounting, and ensuring that the working surface of the pre-filming.
In the embodiment, the corrosion rule of a pipeline system in an oil field low-pressure water delivery pipeline containing CO2 is researched by analyzing the result obtained by carrying out fluid dynamics simulation analysis in the test process of a corrosion device.
Sample preparation: oil field oil extraction waste water (sewage corrosion liquid) retrieved from an oil field is added into a liquid storage tank, and CO2 is introduced into the liquid storage tank by a high-pressure gas cylinder until the liquid storage tank is saturated.
Preparation of the experiment: the electrochemical test sensor embedded with the sample to be tested is installed at a corresponding position of a test section, the position is accurately positioned, the end face to be tested is flush with the inner wall, after the test piece is installed, the operation is carried out according to the function implementation method, the operation comprises an air tightness test, a system deoxygenation process, a liquid preparation process and a secondary deoxygenation process, the pre-corrosion process of the electrochemical sensor is the same as the pre-filming process of an actual experiment, and the corrosion environment is the same. And after the preparation of the corrosion product film is finished, formally starting an experiment, and carrying out electrochemical corrosion tests under different control factors.
And pre-corroding the corrosion sample in a specified corrosion environment, then carrying out electrochemical test according to an experimental scheme, testing the open-circuit potential, curve and alternating-current impedance spectrum of the corrosion product film under different control factors, and obtaining the corrosion rate by comparing and analyzing the electrochemical parameters.
According to the early-stage calculation analysis result in the implementation of the invention, the data acquisition of the test section can be accurately and economically carried out under the condition that a small amount of sensors are arranged in the typical corrosion high-risk area.
Claims (7)
1. A multi-functional liquid single-phase flow corrosion test loop is characterized in that: comprises a liquid storage tank (1), a tank top pressure gauge (2), a temperature detection and control device (3), a tank top emptying valve (4), a high-pressure gas cylinder (5), a gas cylinder emptying valve (6), a gas cylinder control valve (7), a connecting hose (8), an outlet control valve (9), a variable-frequency motor (10), a variable-frequency centrifugal pump (11), an outlet flow control valve (12), a first pressure gauge (13), a thermometer (14), a tee joint I (15), a gate valve I (16), a polytetrafluoroethylene horizontal elbow testing section (17), a polytetrafluoroethylene horizontal straight pipe testing section (18), a flange I (19), a straight pipe replacing section (20), a flange II (21), a check valve I (22), a tee joint II (23), an electromagnetic flowmeter (24), a liquid storage tank inlet valve (25), a gate valve II (26), a second pressure gauge (27), a flexible hose I (28) and a polytetrafluoroethylene upward slope elbow testing section I (29), the device comprises a polytetrafluoroethylene ascending straight pipe testing section (30), a polytetrafluoroethylene ascending elbow testing section II (31), a third pressure gauge (32), a polytetrafluoroethylene descending elbow testing section I (33), a polytetrafluoroethylene descending straight pipe testing section (34), a polytetrafluoroethylene descending elbow testing section II (35), a flexible hose II (36), a fourth pressure gauge (37), a check valve (38) and a movable support frame (39); high-pressure gas cylinder (5) are equipped with atmospheric valve (6) and control valve (7), connect liquid storage pot (1) through hose (8), liquid storage pot (1) inside is provided with temperature detection and controlling means (3), the tank deck is equipped with atmospheric valve (4) and tank deck pressure gauge (2), the export is connected with frequency conversion centrifugal pump (11), fluid reachs tee bend one (15) after the pressure boost, tee bend one (15) divide into two exports, an export is connected with the section of sloping from top to bottom, an export is connected with horizontal pipeline, by gate valve (16, 26) selection route, after the fluid gets into the corrosion test, get back to liquid storage pot (1) after through electromagnetic flowmeter (24) measurement.
2. The detachable multifunctional liquid single-phase flow corrosion experiment test loop device according to claim 1, wherein: straight tube replacement section (20) accessible is dismantled flange one (19) and flange two (21) and is unloaded and be replaced by the reducing pipeline part that connects in parallel, including flange three (40), ooff valve one (41), polytetrafluoroethylene reducing test section one (42), ooff valve two (43), flange four (44), ooff valve three (45), polytetrafluoroethylene reducing test section two (46), ooff valve four (47), ooff valve five (48), polytetrafluoroethylene reducing test section two (49), ooff valve two (50).
3. The detachable multifunctional liquid single-phase flow corrosion experiment test loop device according to claim 1, wherein: the polytetrafluoroethylene test sections (17-18, 29-31, 33-35, 42, 46, 49) are longitudinally and equidistantly provided with electrochemical test sensors (55-57), and the electrochemical test sensors are arranged in four directions of twelve o 'clock (51), three o' clock (52), six o 'clock (53) and nine o' clock (54) on the cross section.
4. The detachable multifunctional liquid single-phase flow corrosion experiment test loop device according to claim 1, wherein: the upslope section and the downslope section are connected with the horizontal pipeline by adopting telescopic hoses (28 and 36), the horizontal straight pipe section is supported by adopting a movable support frame (39), and the inclination angle of the upslope and the downslope is changed by moving the movable support frame (39) back and forth.
5. The detachable multifunctional liquid single-phase flow corrosion experiment test loop device according to claim 1, wherein: the outlet of the tee joint I (15) is divided into two paths, one path is controlled by a gate valve I (16), and enters a replacement pipe section (20) after passing through a polytetrafluoroethylene horizontal elbow testing section (17) and a polytetrafluoroethylene horizontal straight pipe testing section (18), the replacement pipe section (20) can be directly replaced by a parallel variable diameter pipeline, and the replacement pipe section returns to the liquid storage tank (1) after being metered by an electromagnetic flowmeter (24); one path is controlled by a gate valve II (26), enters an up-slope and down-slope testing section, and returns to the liquid storage tank (1) after being measured by an electromagnetic flow meter (24).
6. The detachable multifunctional liquid single-phase flow corrosion experiment test loop device according to claim 1, wherein: the high-pressure gas bottle (5) is provided with an emptying valve (6), and gas is filled into the liquid in the liquid storage tank (1) through a control valve (7), so that the liquid can be saturated, and the corrosion conditions of different media can be tested.
7. The detachable multifunctional liquid single-phase flow corrosion experiment test loop device according to claim 1, wherein: a temperature detection and control device (3) is arranged in the liquid storage tank (1) and is used for adjusting the temperature of the liquid according to the working condition, and a pressure gauge (2) and an emptying valve (4) are arranged in the storage tank to ensure the safety of the liquid storage tank (1); the loop is provided with an electromagnetic flowmeter (24), pressure gauges (13, 27, 32 and 37) and a thermometer (14) for monitoring temperature, pressure and flow on line, the centrifugal pump (8) has a frequency conversion speed regulation function, and the rotating speed and the lift are controlled in real time through a frequency conversion motor (10).
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Cited By (6)
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| CN112275215A (en) * | 2020-10-23 | 2021-01-29 | 西南石油大学 | High-temperature high-pressure reaction kettle for monitoring experimental environment |
| CN112557441A (en) * | 2020-11-30 | 2021-03-26 | 西南石油大学 | Experimental platform and method for influence of gas pipeline fire injection on safety of adjacent liquid hydrocarbon pipes |
| CN113063725A (en) * | 2021-03-25 | 2021-07-02 | 西南石油大学 | Method for quickly identifying corrosion main control factors in pipeline |
| CN113466118A (en) * | 2021-07-02 | 2021-10-01 | 兰州城市学院 | Corrosion test device for petroleum conveying equipment |
| CN113984639A (en) * | 2021-10-29 | 2022-01-28 | 中船黄埔文冲船舶有限公司 | Pipe flow type corrosion test device |
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