CN108469390B - Detachable loop type single-phase flow erosion test device - Google Patents

Abstract

The invention discloses a detachable annular channel type single-phase flow erosion test device. There is a heater inside the liquid storage tank, the bottom outlet of the liquid storage tank is connected to the magnetic drive pump, the magnetic drive pump is connected to the liquid storage tank through the flow control valve, and the outlet end of the magnetic drive pump is connected to the test section through the first stop valve. The section is connected to the top inlet of the liquid storage tank after passing through the second stop valve and the pressure control valve; the top of the liquid storage tank is connected with a feed valve, the side of the liquid storage tank is arranged with a liquid level gauge, and the top of the liquid storage tank is arranged with a safety valve, exhaust valve valve and a second pressure gauge, and a vent valve is arranged on the top of the liquid storage tank. The invention realizes the actual simulated working conditions of the test pipeline in the industrial environment, and studies the erosion corrosion law and erosion corrosion critical characteristics of the pipeline system under the erosion action of high-pressure single-phase flow under the actual working conditions, and is suitable for coal chemical and petrochemical pipelines. It provides a theoretical basis for erosion prediction, optimal design, risk inspection, safety assessment and life prediction.

Description

Detachable loop type single-phase flow erosion test device

technical field

The invention relates to an erosion test device, in particular to a detachable annular channel type single-phase flow erosion test device used in industrial production.

Background technique

As a special equipment that transports fluids under certain pressure, fluid pipelines have various failure modes and complex mechanisms. Common failure modes include: material defects, medium corrosion, external force damage, etc. Among them, the corrosion failure caused by scouring is the pipeline system. The most widespread and common form of vandalism. Erosion has obvious locality, suddenness and risk. Erosion perforation caused by water-containing, corrosive and single-phase flow media has become a key technical problem that plagues the safe operation of fluid pipelines.

In recent years, with the increasing proportion of heavy and sulfur-containing crude oil in the petrochemical industry, the erosion failure of petrochemical industry pipelines and tube bundle-type equipment (heat exchangers, air coolers, etc.) is common, for example: hydrogenation reaction effluent The failure of the air cooler (REAC) has become increasingly prominent and has become a major obstacle to the safe, stable and long-term operation of hydrocracking units. If no corresponding technical measures and countermeasures are taken, my country's oil refining industry will face more and more severe problems Erosion failure of equipment and safety problems of device production.

At present, the quality of crude oil processed by major domestic refineries is becoming more and more serious. The increase of sulfur and nitrogen content in crude oil will inevitably aggravate the corrosion of the high-pressure air cooler system of the hydrogenation unit. It is expected that the failure of the REAC system and unplanned shutdowns will occur more frequently protrude. Although domestic and foreign scholars have carried out a large number of researches on the failure of REAC systems, such as foreign institutions such as NACE, UOP, API, etc., have carried out research on REAC systems for decades and achieved certain results, but so far there is no reliable system. A prediction method to predict the degree of erosion damage of hydrotreating air cooler systems processing high-sulfur crude oil.

In view of the current erosion problems in the fields of coal chemical industry, petrochemical industry, and natural gas transportation, to further study the erosion mechanism of pipelines, some scientific research institutes have designed a series of erosion test devices to study the erosion mechanism of pipelines through experimental research methods. , in order to find the critical velocity of pipeline erosion. However, some shortcomings of the current erosion test device mainly lie in:

(1) Conventional erosion test devices often test the average erosion rate by weighing or thickness measurement, which cannot realize the test and study of the critical value and transient characteristics of fluid erosion damage.

(2) At present, the relevant equipment is tested for a long time, and the experimental results are difficult to promote engineering applications.

SUMMARY OF THE INVENTION

In view of the problems existing in the above-mentioned background technology and the shortcomings of erosion test devices at home and abroad, the purpose of the present invention is to provide a detachable annular channel type single-phase flow erosion test device, which is suitable for the erosion test of the coupling effect of corrosion and flow. It is a complete research system such as corrosion mechanism, simulation analysis of fluid dynamics, experimental research on critical characteristics or transient characteristics of protective film erosion failure, and industrial application promotion of erosion failure prediction.

In order to achieve the above object, the technical scheme adopted in the present invention is:

The invention includes a liquid storage tank, a heater, a flow control valve, a magnetic drive pump, a straight pipe, a first cut-off valve, a test section, a second cut-off valve, an automatic instrument control system, a pressure control valve, a second pressure gauge, Exhaust valve, safety valve, feed valve, liquid level gauge, vent valve and electrochemical test sensor; there is a heater inside the liquid storage tank, and the outlet at the bottom of the liquid storage tank is connected with the inlet end of the magnetic drive pump. The outlet end is connected to the middle inlet of the liquid storage tank through the flow control valve, while the outlet end of the magnetic drive pump is connected to the inlet end of the test section through the first cut-off valve, and the outlet end of the test section passes through the second cut-off valve and the pressure control valve in turn. It is then connected to the top inlet of the liquid storage tank; the top of the liquid storage tank is connected with a feed valve for adding test raw materials, a liquid level gauge is arranged on the side of the liquid storage tank, and a safety valve, an exhaust valve and a first pressure valve are arranged on the top of the liquid storage tank. Two pressure gauges, a vent valve is arranged on the top of the liquid storage tank, which is mainly used to empty the residual liquid of the device.

It also includes an automatic instrument control system. The pipeline between the second shut-off valve and the pressure control valve is provided with a first pressure gauge, a thermometer and a flow meter, and the automatic instrument control system is respectively connected to the second pressure gauge, the first pressure gauge, the thermometer and the flow meter. flow meter.

The magnetic drive pump is respectively connected with the first cut-off valve and the flow control valve through a straight pipe pipeline, and the second cut-off valve and the pressure control valve are connected through a straight pipe pipeline.

The test material enters the liquid storage tank from the feeding valve, is heated by the heater, and is divided into two paths through the output of the magnetic drive pump, one path is returned to the liquid storage tank through the flow control valve, and the other path enters the test section through the first stop valve. After the output of the segment, it flows back to the liquid storage tank through the second stop valve and the pressure control valve. The data collected between the second stop valve and the pressure control valve is transmitted to the automatic instrument control system through the thermometer, the first pressure gauge and the flow meter.

The test section is a 1/4 arc pipe structure, and electrochemical test sensors are arranged on it. The specific arrangement is as follows: the test section is divided into three sub-arc sections with respective corresponding central angles of 30°. Electrochemical test sensors are installed on the pipe surface of the test section at the midpoint of the inner edge arc of the segment, and the outer edge arc of each sub-arc segment is connected to the outer edge arc of the adjacent sub-arc segment The surface of the pipeline in the test section is all electrochemical test sensors; in the middle of the inner edge arc of the pipeline surface of the test section to the side edge arcs on both sides, a parallel arc is made, as an inner parallel arc, two parallel arcs are made. An electrochemical test sensor is arranged on the surface of the pipeline of the test section at the midpoint of the inner parallel arc; a parallel arc is made in the middle between the outer edge arc of the pipe surface of the test section and the side edge arcs on both sides, as Outer parallel arcs, the two outer parallel arcs are divided into three sub-arcs with a corresponding central angle of 30°, and the surface of the test section pipeline at the midpoint of each sub-arc is equipped with an electrochemical test sensor.

The inlet end and the outlet end of the test section are respectively equipped with a first stop valve and a second stop valve, and are connected to the pipeline, thereby realizing the disassembly of the test section 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 section.

The beneficial effects that the present invention has are:

The invention realizes the actual real simulated working conditions of the test pipeline in the industrial environment, the erosion test device for real-time detection of the transient characteristics and critical value of material erosion damage, and can realize the test of the critical value and transient characteristics of fluid erosion damage Research, study the erosion and corrosion law of the pipeline system under the erosion effect of high-pressure single-phase flow under actual working conditions.

The invention can simulate the actual working state more realistically, and can obtain the critical conditions of scouring corrosion by comparing and analyzing the results obtained by the fluid dynamic simulation analysis with the test process of the scouring device, and construct the database of the scouring and corrosion critical corrosion. It provides theoretical basis for erosion prediction, optimal design, risk inspection, safety assessment and life prediction of petrochemical pipelines.

The invention can simulate a series of actual engineering erosion failure cases such as the tube bundle of the hydrogenation air cooling system, and carry out the failure research of erosion damage, erosion prediction, optimization design, risk inspection, safety assessment and life prediction. Safeguard technology research. In addition, the present invention has a simple structure and is easy to popularize.

Description of drawings

FIG. 1 is a schematic diagram of the structural principle of the present invention.

Fig. 2 is an enlarged view of area A (test section 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 picture: including 1, liquid storage tank, 2, heater, 3, flow control valve, 4, magnetic drive pump, 5, straight pipe, 6, first stop valve, 7, test section, 8, second Globe valve, 9, Automatic instrument control system, 10, Thermometer, 11, First pressure gauge, 12, Flow meter, 13, Pressure control valve, 14, Second pressure gauge, 15, Exhaust valve, 16, Safety valve, 17. Feed valve, 18, Level gauge, 19, Vent valve, 20-35, Electrochemical test sensor.

Detailed ways

The present invention will be further described below with reference to the accompanying drawings and embodiments.

As shown in FIG. 1 , the specific implementation of the present invention includes a liquid storage tank 1, a heater 2, a flow control valve 3, a magnetic drive pump 4, a straight pipeline 5, a first stop valve 6, a test section 7, and a second stop valve. 8. Automatic instrument control system 9, pressure control valve 13, second pressure gauge 14, exhaust valve 15, safety valve 16, feed valve 17, liquid level gauge 18, vent valve 19 and electrochemical test sensors 20-35; There is a heater 2 inside the liquid storage tank 1, the bottom outlet of the liquid storage tank 1 is connected to the inlet end of the magnetic drive pump 4, and the outlet end of the magnetic drive pump 4 is connected to the middle inlet of the liquid storage tank 1 through the flow control valve 3, and at the same time. The outlet end of the magnetic drive pump 4 is connected to the inlet end of the test section 7 through the first stop valve 6, and the outlet end of the test section 7 is connected to the top inlet of the liquid storage tank 1 through the second stop valve 8 and the pressure control valve 13 in turn. ; The top of the liquid storage tank 1 is connected with a feed valve 17 for adding test raw materials, a liquid level gauge 18 is arranged on the side of the liquid storage tank 1, and a safety valve 16, an exhaust valve 15 and a second pressure are arranged on the top of the liquid storage tank 1 Table 14, a vent valve 19 is arranged on the top of the liquid storage tank.

In the specific implementation, an automatic instrument control system 9 is also provided. The pipeline between the second shut-off valve 8 and the pressure control valve 13 is provided with a first pressure gauge 11, a thermometer 10 and a flow meter 12. The automatic instrument control system 9 is connected to the second The pressure gauge 14 , the first pressure gauge 11 , the thermometer 10 and the flow gauge 12 .

The automatic instrument control system 9 collects the real-time data of the thermometer 10, the first pressure gauge 11, and the flow meter 11 in the test section, transmits it to the automatic control system 9 for storage, and automatically prints a real-time experimental report at the end of the experiment. The automatic instrument control system 9 realizes automatic real-time adjustment of the actual working conditions of the test section 7 by adjusting the corresponding parameters by collecting and controlling the data of the thermometer 10 , the first pressure gauge 11 and the flow meter 11 .

The magnetic drive pump 4 is respectively connected with the first cut-off valve 6 and the flow control valve 3 through the straight pipe 5 , and the second cut-off valve 8 and the pressure control valve 13 are connected with the straight pipe 5 .

The test raw material enters the liquid storage tank 1 from the feeding valve 17, is heated by the heater 2, and is pumped into the straight pipe line 5 through the magnetic drive pump 4. The output is divided into two paths, and one path is returned to the liquid storage tank 1 through the flow control valve 3. In the test section 7, the other path enters the test section 7 through the first cut-off valve 6, and the output of the test section 7 flows back to the liquid storage tank 1 through the second cut-off valve 8, the straight pipe 5 and the pressure control valve 13, and the second cut-off valve 8 The data is collected and transmitted to the automatic instrument control system 9 through the thermometer 10 , the first pressure gauge 11 , and the flow meter 12 along the way with the pressure control valve 13 .

The working principle of the present invention:

As shown in Figure 1, the detachable single-phase flow erosion test device is installed. Before the test, first open the feed valve 17 to introduce the actual working conditions on the site to a suitable liquid level, and then adjust the flow control valve according to the preset test conditions. 3, The control parameters of the heater 2 and the pressure control valve 13, open the first cut-off valve 6 and the second cut-off valve 8, the test material is in the liquid storage tank 1, heated to the preset value by the heater 2, and then passed through the magnetic drive pump 4 Pressurized into the straight pipe line 5, and then divided into two paths, one of which is returned to the liquid storage tank 1 through the flow control valve 3 to ensure that the other path enters the test section 7 with the predetermined flow value of the experiment, and then passes through the second stop valve 8 along the pipeline. It flows back to the liquid storage tank 1, and the thermometer 10 collects the real-time temperature value of the test section along the way. By comparing with the predetermined value, the automatic control system judges whether to turn on the heater 2; The flow rate value is transmitted to the automatic control system 9 for storage, and the test is automatically printed after the end of the experiment; the flow meter 12 collects the real-time flow rate value of the test section and transmits it to the automatic control system 9 for storage, and the real-time experimental data is automatically printed at the end of the experiment.

In order to test the transient characteristics and erosion critical characteristics of flow corrosion on-line, the present invention adopts an electrochemical online test sensor, monitors the electrochemical characteristics of the corrosion product protective film in real time, and captures the critical state of the sudden change of the corrosion product protective film state through calculation and analysis.

The installation method of the three-electrode electrochemical online test sensor on the test section 7 is as follows, as shown in Figure 2-4: The test section 7 is a 1/4 arc pipe structure, and the test section 7 is divided into three parts with a corresponding central angle of 30°. The sub-arc segment, as shown in Figure 2, the surface of the test section 7 pipeline at the midpoint of the inner edge arc 71 of each sub-arc segment is provided with electrochemical test sensors 20, 21, 22, and each sub-arc segment is The test section 7 pipeline surfaces at the midpoint of the outer edge arc 72 and at the junction of the outer edge arc 72 of the adjacent sub-arc segments are electrochemically tested sensors 25, 26, 27, 28, 29; as shown in Figure 3 As shown, a parallel arc is made in the middle between the inner edge arc 71 of the pipe surface of the test section 7 and the side edge arc 73 on both sides respectively, as the inner parallel arc 74, among the two inner parallel arcs 74 Electrochemical test sensors 23 and 24 are arranged on the surface of the pipeline of the test section 7 at the point; as shown in FIG. One parallel arc is made for each, as the outer parallel arc 75, and the two outer parallel arcs 75 are divided into three sub-arcs with a corresponding central angle of 30°, and the test section at the midpoint of each sub-arc is 7 The surface of the pipeline is equipped with electrochemical test sensors 30, 33, 31, 34, 32, 35.

PLC control scheme of automatic control system 9: The control system hardware adopts Siemens 1214C advanced and reliable microprocessor, and the control code is compiled by itself. The temperature control method in the present invention is as follows: the real-time temperature data of the thermometer 10 is transmitted to the automatic control system 9, and the A/D conversion module used in the system converts the 4-20 mA current signal calibrated by the temperature value into a digital quantity of 0-12000 , by comparing with the preset threshold value, it is judged that the heater 2 is given a heating or heating stop instruction.

The pressure control method in the present invention is as follows: the first pressure gauge 11 transmits real-time pressure data to the automatic control system 9, and the A/D conversion module used in the system converts the 4-20 mA current signal calibrated by the pressure value into a 0- The digital quantity of 12000 is compared with the preset threshold value, and after judgment, an opening or closing command is issued to the pressure control valve 13.

The flow rate control method in the present invention is as follows: the flow meter 12 transmits real-time flow data to the automatic control system 9, and the A/D conversion module used in the system converts the 4-20 mA current signal calibrated by the flow value into a 0-12000 current signal. The digital quantity, through comparison with the preset threshold value, is judged to issue an opening or closing command to the flow control valve 3.

In the specific implementation of the present invention, the actual corrosive medium is used and the temperature, pressure and flow control and adjustment system are used to carry out a more realistic simulation of the actual working state. The functional realization process of the experimental device is as follows: air tightness test→system deoxygenation→temperature adjustment→pressure adjustment→liquid preparation→electrochemical sensor pre-corrosion process→experiment.

(1) Air tightness test: In order to ensure the stability of the system pressure and medium content, and at the same time to ensure the safety of the experiment, the air tightness of the experimental device is checked before the experiment. Close all outlet valves, pass nitrogen to the device through the air inlet to 10kgf·cm-2, check all possible leak points with soapy water, keep the pressure for 1 hour, vent it to normal pressure, and add 4/5 volume to the device The water is filled with nitrogen to 1kgf·cm-2, and the air tightness is checked by the same method.

(2) Deoxygenation of the device: In order to ensure that the experiment is in an oxygen-free state, after the airtightness is qualified, continue to fill with nitrogen to raise the system pressure to 10Kgf·cm-2, vent it to normal pressure, and repeat the above process 10 times. Then, 40kg of distilled water was introduced into the system through a corrosion-resistant self-priming pump, heated to 60°C, nitrogen was bubbled from the bottom of the container to a pressure of 5kgf cm-2, and the pressure in the container was released to normal pressure, repeated 10 times. , it is considered that the device is in an anaerobic state at this time.

(3) Temperature adjustment: The temperature is controlled by the electric heater and the automatic control system at the same time. When the temperature rises to the specified value, the heater automatically trips and stops heating. When the temperature decreases, the heater automatically heats up to realize the temperature control process.

(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 the specified value, the valve automatically closes, and when the pressure decreases, the valve automatically opens slowly to realize the pressure control process.

(5) Solution preparation: In the test, two sets of experimental plans were drawn up.

Option 1: Directly connect the material pipeline in the safety area of the factory area, enter the experimental device, and conduct the experiment directly with the actual material medium. However, it is necessary to comply with the on-site safety management requirements and consider the operation mode according to the actual situation on site.

Option 2: Prepare the experimental solution by yourself. The NH4HS solution is prepared with liquid ammonia, H2S gas and distilled water.

The principle of preparing the solution is as follows: NH ₃ +H ₂ S→NH ₄ HS

The total volume of the erosion experiment device is V _total = 50L, the total volume of the experimental medium is set to V _liquid = 36.00L, m is the amount of NH ₄ HS substance, and the calculation formula of the raw material concentration is as follows:

In the formula, c represents the raw material concentration, W _NH4HS represents the mass of NH ₄ HS, W _H2O represents the mass of H ₂ O, W _NH3 represents the mass of NH ₃ , and W _H2S represents the mass of H ₂ S.

Quantitative distilled water was introduced into the device to remove oxygen. After the air in the exhaust pipe was evacuated, quantitative NH ₃ and H ₂ S gases were added successively. The mass measurement method was adopted during the operation, with an accuracy of 0.01Kg. Since the dissolution of _NH3 and _H2S in water is an exothermic reaction, the temperature of the system will increase during solution preparation. NH ₃ is very soluble in water, and the solubility in water is 1:700 (volume ratio), so ammonia water will be formed after NH ₃ is introduced. H ₂ S is easily soluble in water, and the solubility in water is 1:2.6 (volume ratio). However, the presence of ammonia water increases the solubility of H ₂ S. When the H ₂ S dissolved in ammonia water reaches saturation, the excess H ₂ All of S is present in the gas phase, which increases the pressure of the gas phase in the device. After the temperature was lowered to room temperature, H ₂ S was completely dissolved in ammonia water, and the pressure was reduced to normal pressure.

(6) Pre-filming experiment: first grind the test surface of the pre-filming probe to 800# with water sandpaper, rinse with acetone and deionized water successively, scrub with absolute ethanol, dry with cold air and place it in a desiccator. The pre-film probe is installed on the pre-film device. During the installation process, it is accurately positioned to ensure that the working surface of the pre-film probe is flush with the inner wall of the pre-film device.

Example Corrosion morphology was observed by scanning electron microscope (SEM), X-ray photon spectroscopy (XPS), and X-ray diffraction (XRD), and the characteristics of corrosion products were analyzed, and the fluid dynamics simulation analysis was carried out through the test process with the erosion device. The obtained results were compared and analyzed, and the scour corrosion law of the pipeline system under the effect of high pressure single-phase flow erosion was studied under the actual working conditions, and the scour corrosion critical conditions were obtained, and the scour corrosion critical corrosion database was constructed. The specific test sequence of the erosion critical characteristic is as follows: sample preparation → experiment preparation → erosion critical characteristic test.

(1) Sample preparation: Before the corrosion test, first grind the surface to be measured of the electrochemical test sensor to 800# with water sandpaper, rinse with acetone and deionized water, scrub with absolute ethanol, and dry with cold air. Put in a desiccator for later use.

(2) Experiment preparation: Install the electrochemical test sensor embedded with the sample to be tested in the corresponding position of the test section, and position it accurately so that the end face to be tested is flush with the inner wall. The process of air tightness test, system deoxygenation, liquid dispensing, and secondary deoxygenation process, electrochemical sensor pre-corrosion process is the same as the actual experimental pre-film process, and the corrosion environment is the same. After the corrosion product film was prepared, the experiment was officially started, and the erosion transient characteristics test under different control factors was carried out.

(3) Erosion critical characteristic test: the samples to be corroded are pre-corroded in a designated corrosion environment, and then electrochemical tests are performed according to the experimental plan to test the open circuit potential, Tafel curve, and AC impedance spectrum of the corrosion product film under different control factors. , through the comparative analysis of the above electrochemical parameters, the critical characteristics of erosion damage of the corrosion product film are obtained.

In the implementation of the present invention, according to the previous calculation and analysis results, arranging sensors in the above-mentioned typical high-risk corrosion areas can realize the accurate and economical data collection of the test section with a small number of sensor arrangements.

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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