CN108469390B - Detachable loop type single-phase flow erosion test device - Google Patents
Detachable loop type single-phase flow erosion test device Download PDFInfo
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- 238000012360 testing method Methods 0.000 title claims abstract description 113
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- 238000010438 heat treatment Methods 0.000 description 3
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- 229910000069 nitrogen hydride Inorganic materials 0.000 description 3
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- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention discloses a detachable loop type single-phase flow erosion test device. A heater is arranged in the liquid storage tank, an outlet at the bottom of the liquid storage tank is connected with a magnetic transmission pump, the magnetic transmission pump is connected to the liquid storage tank through a flow control valve, meanwhile, the outlet end of the magnetic transmission pump is connected to a test section through a first stop valve, and the test section is connected to an inlet at the top of the liquid storage tank through a second stop valve and a pressure control valve; the top of the liquid storage tank is connected with a feed valve, the side face of the liquid storage tank is provided with a liquid level meter, the top of the liquid storage tank is provided with a safety valve, an exhaust valve and a second pressure gauge, and the top of the liquid storage tank is provided with an emptying valve. The invention realizes the actual simulation working condition of the test pipeline in the industrial environment, researches the erosion corrosion rule and the erosion corrosion critical characteristic of the high-pressure single-phase flow erosion action pipeline system under the actual working condition, and provides a theoretical basis for the erosion prediction, the optimized design, the risk inspection, the safety evaluation and the service life prediction of the coal chemical industry and petrochemical industry pipelines.
Description
Technical Field
The invention relates to an erosion test device, in particular to a detachable loop type single-phase flow erosion test device used in industrial production.
Background
As special equipment for transporting fluid under certain pressure, a fluid pipeline has various failure modes and complex mechanism, and the common failure modes are as follows: material defects, corrosion of media, external damage, etc., wherein corrosion failure caused by scouring is the most widespread and common form of damage in piping systems. Erosion has obvious locality, paroxysmal and risky properties, and particularly erosion perforation caused by the flowing action of aqueous, corrosive and single-phase flow media becomes a key technical problem which troubles the safe operation of fluid pipelines.
In recent years, with the increasing processing proportion of heavy and sulfur-containing crude oil in the field of petrochemical industry, the erosion failure of petrochemical industry pipelines and pipe bundle type equipment (heat exchangers, air coolers and the like) is common, for example: the failure accident of the hydrogenation Reaction Effluent Air Cooler (REAC) is increasingly prominent, and becomes a main obstacle for seriously restricting the safe, stable and long-period operation of a hydrocracking device, and if corresponding technical measures and countermeasures are not adopted, the oil refining industry in China will face increasingly severe equipment erosion failure and device production safety problems.
At present, the deterioration of crude oil treated by various domestic large oil refineries is becoming more serious, the content of sulfur and nitrogen in the crude oil is increased, the corrosion of a high-pressure air cooler system of a hydrogenation device is increased, and the occurrence of accidents such as failure, unplanned shutdown and the like of an REAC system is expected to be more prominent. Although a large number of research related to the failure of the REAC system is conducted by scholars at home and abroad, for example, organizations such as NACE, UOP, API and the like at home and abroad have conducted decades of research on the REAC system and obtain certain results, a set of reliable prediction method for predicting the erosion damage degree of a hydrogenation air cooler system for processing high-sulfur crude oil does not exist so far.
Aiming at the erosion problems in the fields of coal chemical industry, petrochemical industry and natural gas transportation at present, the erosion mechanism of the pipeline is further researched, a series of erosion test devices are designed in some scientific research institutes, the erosion mechanism of the pipeline is researched by a test research means, and the critical flow rate of pipeline erosion is expected to be found. However, the existing erosion test device has some defects mainly that:
(1) the conventional erosion test device tests the average erosion rate by a weighing or thickness measuring method, and cannot realize the test research on the critical value and the transient characteristic of fluid erosion damage.
(2) 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 the erosion test device at home and abroad, the invention aims to provide a detachable loop type single-phase flow erosion test device which is suitable for a complete research system such as an erosion mechanism of corrosion and flow coupling action, simulation analysis of fluid dynamics, test research on erosion damage critical characteristics or transient characteristics of a protective film, erosion failure prediction industrial application and popularization and the like.
In order to achieve the purpose, the invention adopts the technical scheme that:
the invention comprises a liquid storage tank, a heater, a flow control valve, a magnetic transmission pump, a straight pipe pipeline, a first stop valve, a test section, a second stop valve, an automatic instrument control system, a pressure control valve, a second pressure gauge, an exhaust valve, a safety valve, a feeding valve, a liquid level meter, an emptying valve and an electrochemical test sensor; a heater is arranged in the liquid storage tank, an outlet at the bottom of the liquid storage tank is connected with an inlet end of the magnetic transmission pump, an outlet end of the magnetic transmission pump is connected to an inlet in the middle of the liquid storage tank through a flow control valve, an outlet end of the magnetic transmission pump is connected to an inlet end of a test section through a first stop valve, and an outlet end of the test section is connected to an inlet in the top of the liquid storage tank after sequentially passing through a second stop valve and a pressure control valve; the top of the liquid storage tank is connected with a feed valve for adding test raw materials, a liquid level meter is arranged on the side face of the liquid storage tank, a safety valve, an exhaust valve and a second pressure gauge are arranged at the top of the liquid storage tank, and an emptying valve is arranged at the top of the liquid storage tank and is mainly used for emptying residual liquid of the device.
The automatic instrument control system is connected with the second pressure gauge, the first pressure gauge, the thermometer and the flowmeter respectively.
The magnetic transmission pump is respectively connected with the first stop valve and the flow control valve through straight pipe pipelines, and the second stop valve is connected with the pressure control valve through straight pipe pipelines.
The test raw materials enter the liquid storage tank from the feeding valve, are heated by the heater, are output by the magnetic transmission pump and are divided into two paths, one path of the test raw materials flows back into the liquid storage tank through the flow control valve, the other path of the test raw materials enters the test section through the first stop valve, the test section outputs the test raw materials and flows back to the liquid storage tank through the second stop valve and the pressure control valve, and data collected by the thermometer, the first pressure gauge and the flow gauge along the path between the second stop valve and the pressure control valve are transmitted to the automatic instrument control system.
The experimental section be 1/4 circular arc pipeline structure, arranged the electrochemistry test sensor above, the concrete arrangement mode is: the test section is divided into three sub-arc sections which respectively correspond to the central angles of 30 degrees, the surface of the test section pipeline at the midpoint of the inner edge arc line of each sub-arc section is provided with an electrochemical test sensor, and the surface of the test section pipeline at the midpoint of the outer edge arc line of each sub-arc section and the joint of the outer edge arc lines of the adjacent sub-arc sections is provided with the electrochemical test sensors; respectively making a parallel arc line from the inner edge arc line of the surface of the test section pipeline to the middle between the side edge arc lines at two sides as an inner parallel arc line, wherein the surface of the test section pipeline at the midpoint of the two inner parallel arc lines is provided with an electrochemical test sensor; and respectively making a parallel arc line from the outer edge arc line of the surface of the test section pipeline to the middle between the side edge arc lines at two sides as the outer parallel arc line, wherein the two outer parallel arc lines are equally divided into three sections of sub-arc lines with central angles of 30 degrees, and the surface of the test section pipeline at the midpoint of each section of sub-arc line is provided with an electrochemical test sensor.
The inlet end and the outlet end of the test section are respectively provided with a first stop valve and a second stop valve, and the test section is connected to a pipeline, so that the test section can be detached through the first stop valve and the second stop valve.
The central angle is the central angle corresponding to the 1/4 arc of the test segment.
The invention has the beneficial effects that:
the erosion test device realizes the actual real simulation working condition of the test pipeline in the industrial environment, detects the transient characteristic and the critical value of the erosion damage of the material in real time, can realize the test and research of the critical value and the transient characteristic of the erosion damage of the fluid, and researches the erosion corrosion rule of the high-pressure single-phase flow erosion action pipeline system under the actual working condition.
The method can simulate a more real actual working state, can obtain the critical condition of the erosion corrosion by comparing and analyzing the result obtained by the fluid dynamics simulation analysis in the test process of the erosion device, constructs a critical erosion corrosion database, and provides a theoretical basis for erosion prediction, optimal design, risk inspection, safety evaluation and service life prediction of pipelines in the coal chemical industry and the petrochemical industry.
The method can simulate a series of actual engineering erosion failure cases such as the tube bundle of the hydrogenation air cooling system and the like, and carry out the failure research of erosion damage, the safety guarantee technical research of pipelines and tube bundle equipment such as erosion prediction, optimized design, risk inspection, safety assessment, service life prediction and the like. In addition, the invention has simple structure and is easy to popularize.
Drawings
Fig. 1 is a schematic diagram of the structural principle of the present invention.
Fig. 2 is an enlarged view of region a (test segment 7) of fig. 1.
Fig. 3 is a left side view of the test section 7.
Fig. 4 is a right side view of the test section 7.
In the figure: the device comprises a liquid storage tank 1, a liquid storage tank 2, a heater 3, a flow control valve 4, a magnetic transmission pump 5, a straight pipe pipeline 6, a first stop valve 7, a test section 8, a second stop valve 9, an automatic instrument control system 10, a thermometer 11, a first pressure gauge 12, a flow gauge 13, a pressure control valve 14, a second pressure gauge 15, an exhaust valve 16, a safety valve 17, a feeding valve 18, a liquid level gauge 19, an emptying valve 20-35 and an electrochemical test sensor.
Detailed Description
The invention is further illustrated by the following figures and examples.
As shown in FIG. 1, the specific implementation of the invention comprises a liquid storage tank 1, a heater 2, a flow control valve 3, a magnetic transmission pump 4, a straight pipe 5, a first stop valve 6, a test section 7, a second stop valve 8, an automatic instrument control system 9, a pressure control valve 13, a second pressure gauge 14, an exhaust valve 15, a safety valve 16, a feed valve 17, a liquid level gauge 18, a vent valve 19 and electrochemical test sensors 20-35; a heater 2 is arranged in the liquid storage tank 1, an outlet at the bottom of the liquid storage tank 1 is connected with an inlet end of a magnetic transmission pump 4, an outlet end of the magnetic transmission pump 4 is connected to an inlet in the middle of the liquid storage tank 1 through a flow control valve 3, meanwhile, an outlet end of the magnetic transmission pump 4 is connected to an inlet end of a test section 7 through a first stop valve 6, and an outlet end of the test section 7 is connected to an inlet in the top of the liquid storage tank 1 after sequentially passing through a second stop valve 8 and a pressure control valve 13; the top of the liquid storage tank 1 is connected with a feed valve 17 for adding test raw materials, a liquid level meter 18 is arranged on the side face of the liquid storage tank 1, a safety valve 16, an exhaust valve 15 and a second pressure gauge 14 are arranged on the top of the liquid storage tank 1, and an emptying valve 19 is arranged on the top of the liquid storage tank.
The specific implementation is also provided with an automatic instrument control system 9, a first pressure gauge 11, a thermometer 10 and a flow meter 12 are arranged on a pipeline between the second stop valve 8 and the pressure control valve 13, and the automatic instrument control system 9 is respectively connected with a second pressure gauge 14, the first pressure gauge 11, the thermometer 10 and the flow meter 12.
The automatic instrument control system 9 collects real-time data of the test section on the thermometer 10, the first pressure gauge 11 and the flow meter 11, transmits the real-time data to the automatic instrument control system 9 for storage, and automatically prints a real-time experiment report when the experiment is finished. The automatic instrument control system 9 adjusts corresponding parameters through data acquisition and control of the thermometer 10, the first pressure gauge 11 and the flow meter 11, and realizes automatic real-time adjustment of the actual working condition of the test section 7.
The magnetic transmission pump 4 is respectively connected with the first stop valve 6 and the flow control valve 3 through straight pipe pipelines 5, and the second stop valve 8 is connected with the pressure control valve 13 through straight pipe pipelines 5.
The test raw materials enter the liquid storage tank 1 from the feed valve 17, are heated by the heater 2, are pumped into the straight pipe pipeline 5 by the magnetic transmission pump 4 and then are output and divided into two paths, one path returns to the liquid storage tank 1 through the flow control valve 3, the other path enters the test section 7 through the first stop valve 6, the test section 7 outputs and then flows back to the liquid storage tank 1 through the second stop valve 8, the straight pipe pipeline 5 and the pressure control valve 13, and data collected by the thermometer 10, the first pressure gauge 11 and the flow gauge 12 along the path between the second stop valve 8 and the pressure control valve 13 are transmitted to the automatic instrument control system 9.
The working principle of the invention is as follows:
as shown in fig. 1, a detachable single-phase flow erosion test device is installed, before a test, a feed valve 17 is firstly opened to introduce a field actual working condition raw material to a proper liquid level, then control parameters of a flow control valve 3, a heater 2 and a pressure control valve 13 are modulated according to preset test conditions, a first stop valve 6 and a second stop valve 8 are opened, the test raw material is heated to a preset value by the heater 2 in a liquid storage tank 1, then the test raw material is pressurized by a magnetic transmission pump 4 to enter a straight pipe pipeline 5, and then the test raw material is divided into two paths, one path flows back to the liquid storage tank 1 through the flow control valve 3, the other path is ensured to enter a test section 7 with an experimental preset flow value and then flows back to the liquid storage tank 1 through the second stop valve 8, a thermometer 10 on the way collects a real-time temperature value of the test section; the thermometer 10, the first pressure gauge 11 and the flow gauge 12 collect real-time flow values of the test section, and transmit the real-time flow values to the automatic control system 9 for storage, and automatic printing is performed after the experiment is finished; the flow meter 12 collects real-time flow values of the test section, transmits the real-time flow values to the automatic control system 9 for storage, and automatically prints real-time experimental data after the experiment is finished.
In order to test the transient characteristic and the erosion critical characteristic of the flow corrosion on line, the invention adopts an electrochemical on-line test sensor to monitor the electrochemical characteristic of the corrosion product protective film in real time and capture the critical state of the corrosion product protective film in which the state is mutated through calculation and analysis.
The three-electrode electrochemical on-line test sensor on test section 7 is mounted as follows, see fig. 2-4: the test section 7 is of an 1/4 circular arc pipeline structure, the test section 7 is divided into three sub-circular arc sections which respectively correspond to the central angles of 30 degrees, as shown in fig. 2, the pipeline surface of the test section 7 at the midpoint of the inner edge arc line 71 of each sub-circular arc section is provided with electrochemical test sensors 20,21 and 22, and the pipeline surface of the test section 7 at the junction of the midpoint of the outer edge arc line 72 of each sub-circular arc section and the outer edge arc line 72 of the adjacent sub-circular arc section is provided with electrochemical test sensors 25,26,27,28 and 29; as shown in fig. 3, a parallel arc line is respectively formed from the inner edge arc line 71 of the pipeline surface of the test section 7 to the middle between the side edge arc lines 73 at the two sides, and is used as an inner parallel arc line 74, and the electrochemical test sensors 23 and 24 are arranged on the pipeline surface of the test section 7 at the midpoint of the two inner parallel arc lines 74; as shown in fig. 4, a parallel arc line is respectively formed from an outer edge arc line 72 of the surface of the test section 7 to the middle between side edge arc lines 73 at two sides, and is used as an outer parallel arc line 75, the two outer parallel arc lines 75 are respectively divided into three sub-arc lines with central angles of 30 degrees, and the surface of the test section 7 at the midpoint of each sub-arc line is provided with electrochemical test sensors 30,33,31,34,32, 35.
PLC control scheme of the automatic control system 9: the hardware of the control system adopts a Siemens 1214C advanced and reliable microprocessor, and the control code is compiled by itself. The temperature control method comprises the following steps: the thermometer 10 transmits real-time temperature data to an automatic control system 9, an A/D conversion module used in the system converts a 4-20 mA current signal calibrated by a temperature value into a digital quantity of 0-12000, and a heating instruction or a heating stopping instruction is sent to the heater 2 by comparing the digital quantity with a preset threshold value and judging.
The pressure control method comprises the following steps: the first pressure gauge 11 transmits real-time pressure data to the automatic control system 9, an A/D conversion module used in the system converts a 4-20 mA current signal calibrated by a pressure value into a digital quantity of 0-12000, and the digital quantity is compared with a preset threshold value, and an opening or closing instruction is sent to the pressure control valve 13 through judgment.
The flow rate control method in the invention comprises the following steps: the flow meter 12 transmits real-time flow data to the automatic control system 9, an A/D conversion module used in the system converts a 4-20 mA current signal calibrated by a flow value into a digital quantity of 0-12000, and an opening or closing instruction is sent to the flow control valve 3 by comparing the digital quantity with a preset threshold value and judging.
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 is as follows: air tightness test → system oxygen removal → temperature regulation → pressure regulation → liquid preparation → electrochemical sensor pre-corrosion process → experiment.
(1) And (3) air tightness test: in order to ensure the stability of system pressure and medium content and simultaneously ensure the experimental safety, the air tightness of the experimental device is tested before the experiment. All outlet valves were closed, nitrogen gas was introduced into the apparatus through the gas inlet to 10kgf cm-2, all possible leakage points were checked with soapy water, pressure was maintained for 1 hour, then the apparatus was vented to normal pressure, 4/5 volumes of water were added to the apparatus, nitrogen gas was again introduced to 1kgf cm-2, and airtightness was checked by the same method.
(2) Deoxidizing the device: in order to ensure that the experiment is in an anaerobic state, after the airtight condition is qualified, the nitrogen is continuously filled to increase the system pressure to 10Kgf cm < -2 >, the system pressure is released to the normal pressure, and the process is repeated for 10 times. Then, 40kg of distilled water was introduced into the system through a corrosion-resistant self-priming pump, heated to 60 ℃ and nitrogen was blown from the bottom of the vessel to a pressure of 5kgf cm-2, and the pressure in the vessel was vented to normal pressure, and this was repeated 10 times, whereby the inside of the apparatus was considered to be in an oxygen-free state.
(3) Temperature regulation: the temperature is controlled by the electric heater and the automatic control system at the same time, when the temperature rises to a specified value, the heater automatically trips off to stop heating, and after the temperature is reduced, the heater automatically heats, so that the temperature control process is realized.
(4) Pressure regulation: the pressure is controlled by the pressure control valve and the automatic control system at the same time, when the pressure rises to a specified value, the valve is automatically closed, and when the pressure is reduced, the valve is automatically and slowly opened, so that the pressure control process is realized.
(5) Solution preparation: in the experiment, two sets of experimental protocols were developed.
The first scheme is as follows: the material pipeline is directly led in a factory safety area of a factory and enters an experimental device, and an experiment is directly carried out by using an actual material medium. But the operation mode is considered according to the actual situation of the site according to the site safety management requirement.
Scheme II: prepare the experimental solution by itself. Liquid ammonia, H2S gas and distilled water are adopted to prepare NH4HS solution.
The principle of solution preparation is as follows: NH (NH)3+H2S→NH4HS
Total volume V of erosion experimental devicetotalThe total volume V of the test medium was set to 50Lliquid36.00L, m is NH4The amount of HS substance and the raw material concentration are calculated according to the following formula:
wherein c represents the raw material concentration, WNH4HSRepresents NH4Mass of HS, WH2OTo representH2Mass of O, WNH3Represents NH3Mass of (W)H2SRepresents H2The mass of S.
Quantitative distilled water is introduced into the device and oxygen is removed, and quantitative NH is added into the device after air in the exhaust pipe is exhausted3And H2S gas, the accuracy is 0.01Kg by adopting a mass metering method in the operation process. Due to NH3And H2The dissolution process of S in water is an exothermic reaction, and thus the temperature of the system will rise during the solution formulation process. NH (NH)3Very soluble in water, with a solubility in water of 1: 700 (volume ratio) so NH is introduced3Ammonia is then formed. H2S is readily soluble in water, with a solubility in water of 1: 2.6 (volume ratio), however, the presence of ammonia increases H2Solubility of S, H dissolved in aqueous ammonia2After S is saturated, excess H2S is totally present in the gas phase, raising the pressure of the gas phase in the apparatus. After the temperature is reduced to room temperature, H2S is completely dissolved in ammonia water, and the pressure is reduced to normal pressure.
(6) Pre-filming experiment: 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, a Scanning Electron Microscope (SEM), an X-ray photon spectroscopy (XPS) and an X-ray diffraction (XRD) are used for observing the corrosion morphology, the characteristics of a corrosion product are analyzed, the characteristic is compared with the result obtained by carrying out fluid dynamics simulation analysis in the test process of the erosion device, the erosion corrosion rule of a high-pressure single-phase flow erosion action pipeline system under the actual working condition is researched, the erosion corrosion critical condition is obtained, and an erosion corrosion critical corrosion database is constructed. The specific test sequence of the erosion critical characteristics is as follows: sample preparation → experimental preparation → erosion critical characteristics test.
(1) Sample preparation: before the corrosion test, the surface to be tested of the electrochemical test sensor is firstly polished to 800# by water sand paper, washed by acetone and deionized water, scrubbed by absolute ethyl alcohol, dried by cold air and then placed into a dryer for standby.
(2) 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 corrosion product film is prepared, formally starting an experiment, and carrying out erosion transient characteristic tests under different control factors.
(3) Erosion critical characteristic test: and after the corrosion sample is pre-corroded in a specified corrosion environment, carrying out electrochemical test according to an experimental scheme, testing the open-circuit potential, the Tafel curve and the alternating-current impedance spectrum of the corrosion product film under different control factors, and obtaining the critical characteristic of the corrosion product film subjected to erosion damage 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 (4)
1. The utility model provides a can dismantle circuit formula single-phase flow erosion test device which characterized in that: the device comprises a liquid storage tank (1), a heater (2), a flow control valve (3), a magnetic transmission pump (4), a straight pipe pipeline (5), a first stop valve (6), a test section (7), a second stop valve (8), an automatic instrument control system (9), a pressure control valve (13), a second pressure gauge (14), an exhaust valve (15), a safety valve (16), a feed valve (17), a liquid level meter (18), a vent valve (19) and electrochemical test sensors (20-35); a heater (2) is arranged in the liquid storage tank (1), an outlet at the bottom of the liquid storage tank (1) is connected with an inlet end of a magnetic transmission pump (4), an outlet end of the magnetic transmission pump (4) is connected to an inlet in the middle of the liquid storage tank (1) through a flow control valve (3), an outlet end of the magnetic transmission pump (4) is connected to an inlet end of a test section (7) through a first stop valve (6), and an outlet end of the test section (7) is connected to an inlet in the upper side face of the liquid storage tank (1) after sequentially passing through a second stop valve (8) and a pressure control valve (13); the top of the liquid storage tank (1) is connected with a feed valve (17) for adding test raw materials, the side surface of the liquid storage tank (1) is provided with a liquid level meter (18), the top of the liquid storage tank (1) is provided with a safety valve (16), an exhaust valve (15) and a second pressure gauge (14), and the bottom of the liquid storage tank is provided with an emptying valve (19);
the test section (7) is of an 1/4 arc pipeline structure, electrochemical test sensors (20-35) are arranged on the test section, and the specific arrangement mode is as follows: the test section (7) is divided into three sub-arc sections which correspond to the central angles of 30 degrees respectively, electrochemical test sensors (20,21,22) are arranged on the surface of the test section (7) at the middle point of the inner edge arc line (71) of each sub-arc section, and the electrochemical test sensors (25,26,27,28,29) are arranged on the surface of the test section (7) at the connection position of the middle point of the outer edge arc line (72) of each sub-arc section and the outer edge arc line (72) of the adjacent sub-arc section; an inner edge arc line (71) on the surface of the pipeline of the test section (7) is respectively connected with the middle between the side edge arc lines (73) at two sides to form a parallel arc line which is used as an inner parallel arc line (74), and the surface of the pipeline of the test section (7) at the midpoint of the two inner parallel arc lines (74) is provided with electrochemical test sensors (23, 24); the method is characterized in that a parallel arc line is respectively made from an outer edge arc line (72) of the surface of the test section (7) to the middle between side edge arc lines (73) at two sides and is used as an outer parallel arc line (75), the two outer parallel arc lines (75) are equally divided into three sub-arc lines respectively corresponding to the central angles of 30 degrees, and the surface of the test section (7) at the midpoint of each sub-arc line is provided with an electrochemical test sensor (30,33,31,34,32, 35).
2. The detachable loop type single-phase flow erosion test device according to claim 1, wherein: the automatic flow meter is characterized by further comprising an automatic meter control system (9), a first pressure meter (11), a thermometer (10) and a flow meter (12) are arranged on a pipeline between the second stop valve (8) and the pressure control valve (13), and the automatic meter control system (9) is respectively connected with the second pressure meter (14), the first pressure meter (11), the thermometer (10) and the flow meter (12).
3. The detachable loop type single-phase flow erosion test device according to claim 1, wherein: the magnetic transmission pump (4) is respectively connected with the first stop valve (6) and the flow control valve (3) through straight pipe pipelines (5), and the second stop valve (8) is connected with the pressure control valve (13) through the straight pipe pipelines (5).
4. The detachable loop type single-phase flow erosion test device according to claim 1, wherein: the test raw materials enter the liquid storage tank (1) from the feeding valve (17), are heated by the heater (2), are output by the magnetic transmission pump (4) and divided into two paths, one path flows back to the liquid storage tank (1) through the flow control valve (3), the other path enters the test section (7) through the first stop valve (6), the test section (7) flows back to the liquid storage tank (1) after being output through the second stop valve (8) and the pressure control valve (13), and data collected by the second stop valve (8) and the pressure control valve (13) are transmitted to the automatic instrument control system (9) along the way through the thermometer (10), the first pressure gauge (11) and the flow meter (12).
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| CN110672507A (en) * | 2019-10-14 | 2020-01-10 | 浙江理工大学 | Adjustable oil-water two-phase pipe wall wetting and corrosion measurement experimental device |
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Inventor after: Jin Haozhe Inventor after: Our country is rich Inventor after: OuYang Pengwei Inventor after: Lv Wenchao Inventor after: Xu Xiaofeng Inventor before: Our country is rich Inventor before: OuYang Pengwei Inventor before: Lv Wenchao Inventor before: Xu Xiaofeng Inventor before: Jin Haozhe |
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Application publication date: 20180831 Assignee: Zhejiang Zhongjing Bearing Co.,Ltd. Assignor: ZHEJIANG SCI-TECH University Contract record no.: X2022330000080 Denomination of invention: Detachable loop type single-phase flow erosion test device Granted publication date: 20201027 License type: Common License Record date: 20220506 |