CN108469390A - Detachable loop type single-phase flow erosion test device - Google Patents

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

Detachable loop type single-phase flow erosion test device

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 technique

As a special equipment that transports fluid under a certain pressure, the fluid pipeline has various failure forms and complex mechanisms. The common failure forms include: material defects, medium corrosion, external force damage, etc. Among them, the corrosion failure caused by erosion is the pipeline system. The most widespread and common form of damage. Erosion has obvious locality, suddenness and risk, especially the erosion and perforation caused by the flow of 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, in the field of petrochemical industry, with the increasing processing proportion of heavy and sulfur-containing crude oil, the erosion failure of pipelines and tube bundle equipment (heat exchangers, air coolers, etc.) in the petrochemical industry is more common, such as: hydrogenation reaction effluent Air cooler (REAC) failure accidents have become increasingly prominent, and have become a major obstacle that seriously restricts the safe, stable, and long-term operation of hydrocracking units. If corresponding technical measures and countermeasures are not taken, my country's oil refining industry will face increasingly severe problems. The erosion failure of equipment and the safety issues of device production.

At present, the inferior 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 scholars at home and abroad have conducted a large number of related researches on the failure of REAC systems, such as foreign NACE, UOP, API and other institutions 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 a hydroprocessing air cooler system for processing high-sulfur crude oil.

Aiming at 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 by means of experimental research , 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 measure the average erosion rate by weighing or thickness measurement, and cannot realize the test and research on the critical value and transient characteristics of fluid erosion damage.

(2) At present, it takes a long time to test related equipment, and the experimental results are difficult to promote engineering applications.

Contents 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 loop-type single-phase flow erosion test device, which is suitable for the erosion test of the coupling effect of corrosion and flow. A complete research system including simulation analysis of erosion mechanism and fluid dynamics, experimental research on critical characteristics or transient characteristics of protective film erosion damage, and industrial application and 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 stop valve, a test section, a second stop 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, the outlet at the bottom of the liquid storage tank is connected to the inlet port of the magnetic drive pump, and 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. Afterwards, it is 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 second 2. Pressure gauge. There is a vent valve 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, a first pressure gauge, a thermometer and a flow gauge are arranged on the pipeline between the second cut-off valve and the pressure control valve, and the automatic instrument control system is respectively connected with the second pressure gauge, the first pressure gauge, the thermometer and the flow meter.

The magnetic drive pump is connected to the first cut-off valve and the flow control valve through straight pipes, and the second cut-off valve is connected to the pressure control valve through straight pipes.

The test raw material enters the liquid storage tank from the feed valve, is heated by the heater, and is divided into two paths through the output of the magnetic drive pump. One path flows back into the liquid storage tank through the flow control valve, and the other path enters the test section through the first cut-off valve. After the output of the stage, it flows back to the liquid storage tank through the second cut-off valve and the pressure control valve, and the data collected by the thermometer, the first pressure gauge and the flow meter along the way between the second cut-off valve and the pressure control valve are transmitted to the automatic instrument control system.

The test section is a 1/4 circular arc pipeline structure, and electrochemical test sensors are arranged on it. The specific layout method is: the test section is divided into three sub-arc sections with a central angle of 30°, each sub-arc Electrochemical test sensors are installed on the pipe surface of the test section at the midpoint of the inner edge arc of each section, and the outer edge arc of each sub-arc section is connected with the outer edge arc of the adjacent sub-arc section The surface of the pipeline in the test section at the place is electrochemically tested with sensors; a parallel arc is made in the middle between the inner edge arcs of the test section pipeline surface and the side edge arcs on both sides respectively, as the inner parallel arcs, two The surface of the test section pipeline at the midpoint of the inner parallel arc is provided with an electrochemical test sensor; a parallel arc is made in the middle between the outer edge arcs of the test section pipeline surface and the side edge arcs on both sides respectively, as Outer parallel arcs, the two outer parallel arcs are divided into three sub-arcs corresponding to the 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 cut-off valve and a second cut-off valve, which are connected to the pipeline, thereby realizing the detachability of the test section through the first cut-off valve and the second cut-off 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 and real simulated working conditions of the test pipeline in the industrial environment, an erosion test device for real-time detection of the transient characteristics and critical values of material erosion damage, and can realize the test of the critical value and transient characteristics of fluid erosion damage Research, to study the erosion and corrosion laws of the pipeline system under the erosion effect of high-pressure single-phase flow under actual working conditions.

The present invention can carry out more realistic actual working state simulation, and can obtain the critical condition of erosion corrosion by comparing and analyzing the results obtained from the fluid dynamics simulation analysis with the test process of the erosion device, and construct the critical erosion corrosion database, which is useful for coal chemical industry, Provide a 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 hydrogenation air cooling system tube bundles, and conduct erosion damage failure research, erosion prediction, optimization design, risk inspection, safety assessment and life prediction, etc. 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 structure 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 figure: including 1. Liquid storage tank, 2. Heater, 3. Flow control valve, 4. Magnetic drive pump, 5. Straight pipe, 6. First cut-off 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. Liquid level gauge, 19. Vent valve, 20-35, electrochemical test sensor.

Detailed ways

The present invention will be further described below in conjunction with drawings and embodiments.

As shown in Figure 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 pipe pipeline 5, a first shut-off valve 6, a test section 7, and a second shut-off 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; The liquid storage tank 1 is provided with a heater 2 inside, and 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 transmission pump 4 is connected to the inlet end of the test section 7 through the first cut-off 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 cut-off valve 8 and the pressure control valve 13 in turn. The top of liquid storage tank 1 is connected with feed valve 17 for adding test raw materials, liquid level gauge 18 is arranged on the side of liquid storage tank 1, and safety valve 16, exhaust valve 15 and second pressure are arranged on the top of liquid storage tank 1. Table 14, a vent 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, 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, and the automatic instrument control system 9 is respectively connected to the second Pressure gauge 14 , first pressure gauge 11 , thermometer 10 and 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, and transmits them to the automatic control system 9 for storage, and automatically prints the real-time experiment report when the experiment ends. The automatic instrument control system 9 realizes the automatic real-time adjustment of the actual working conditions of the test section 7 through the data collection and control of the thermometer 10, the first pressure gauge 11, and the flow meter 11, and adjusts corresponding parameters.

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

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

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, the feed valve 17 is first opened to introduce the actual working condition raw materials to the appropriate liquid level, and then the flow control valve 3 is adjusted according to the preset test conditions. 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 raw material is in the liquid storage tank 1, after being heated to the preset value by the heater 2, it is passed through the magnetic drive pump 4 Pressurized into the straight pipeline 5, and then divided into two paths, one path flows back into the liquid storage tank 1 through the flow control valve 3, ensuring 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 Flow back to the liquid storage tank 1, and the thermometer 10 along the way collects the real-time temperature value of the test section. By comparing with the predetermined value, the automatic control system judges whether to open the heater 2; the thermometer 10, the first pressure gauge 11, and the flow meter 12 collect the real-time temperature value of the test section. The flow value is transmitted to the automatic control system 9 for storage, and is automatically printed at the end of the experiment; the flow meter 12 collects the real-time flow value of the test section, and is transmitted 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 flow corrosion transient characteristics and erosion critical characteristics on-line, the present invention adopts an electrochemical on-line test sensor to monitor the electrochemical characteristics of the corrosion product protective film in real time, and captures the critical state where the state of the corrosion product protective film changes suddenly through calculation and analysis.

The installation method of the three-electrode electrochemical on-line test sensor on the test section 7 is as follows, see Figure 2-4: the test section 7 is a 1/4 arc pipe structure, and the test section 7 is divided into three sections with a central angle of 30°. Segment sub-arc section, as shown in Figure 2, the test section 7 pipe surfaces at the midpoint of the inner edge of each sub-arc section along the arc 71 are provided with electrochemical test sensors 20,21,22, each section sub-arc section The outer edge arc 72 midpoint and the test section 7 pipeline surface at the junction of the outer edge arc 72 of the adjacent sub-arc section 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, and the two inner parallel arcs 74 The test section 7 pipeline surface at the point is provided with electrochemical test sensors 23,24; Each make a parallel arc as the outer parallel arc 75, and the two outer parallel arcs 75 are equally divided into three sections of sub-arcs whose central angles are 30°, and the test section at the midpoint of each sub-arc is 7 Electrochemical test sensors 30, 33, 31, 34, 32, 35 are arranged on the surface of the pipeline.

The PLC control scheme of the automatic control system 9: the control system hardware adopts Siemens 1214C advanced and reliable microprocessor, and the control code is self-compiled. The temperature control method in the present invention is: 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 4～20mA current signal calibrated by the temperature value into a digital quantity of 0-12000 , by comparing with the preset threshold value, after judgment, a heating or stopping heating instruction is issued to the heater 2 .

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

The flow rate control method among the present invention is: the flow meter 12 transmits the real-time flow data to the automatic control system 9, and the A/D conversion module used in the system converts the 4～20mA current signal calibrated by the flow value into a current signal of 0-12000 The digital quantity is judged by comparing with the preset threshold value, and sends 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 simulate the actual working state more realistically. The function 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 to ensure the safety of the experiment, the air tightness of the experimental device was checked before the experiment. Close all outlet valves, pass nitrogen gas into the device through the air inlet to 10kgf cm-2, check all possible leak points with soapy water, keep the pressure for 1 hour, release to normal pressure, and add 4/5 volume to the device water, and then filled with nitrogen to 1kgf·cm-2, the same method is used to test the airtightness.

(2) Deoxygenation of the device: In order to ensure that the experiment is in an anaerobic state, after the airtightness is qualified, continue to fill the system with nitrogen to raise the system pressure to 10Kgf·cm-2, release it to normal pressure, and repeat the above process 10 times. Then, pass 40kg of distilled water into the system through a corrosion-resistant self-priming pump, heat to 60°C, blow nitrogen from the bottom of the container until the pressure is 5kgf·cm-2, and release the pressure in the container to normal pressure, repeat this 10 times , it is considered that the device is in an oxygen-free 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. After the temperature drops, the heater automatically heats up to realize the temperature control process.

(4) Pressure adjustment: The pressure is controlled simultaneously by the pressure control valve and the automatic control system. When the pressure rises to a specified value, the valve will automatically close, and after the pressure decreases, the valve will automatically and slowly open to realize the pressure control process.

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

Option 1: Directly connect the material pipeline in the safe 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 site safety management requirements and consider the operation method according to the actual situation on site.

Solution 2: Prepare the experimental solution by yourself. Use liquid ammonia, H2S gas and distilled water to prepare NH4HS solution.

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

The total volume of the erosion test 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 is introduced into the device to remove oxygen. After the air in the exhaust pipe is emptied, quantitative NH ₃ and H ₂ S gases are added successively. The mass measurement method is adopted during the operation, and the accuracy is 0.01Kg. Since the dissolution process of NH ₃ and H ₂ S in water is an exothermic reaction, the temperature of the system will increase during the solution preparation process. 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 passed through. 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 dissolved H ₂ S in ammonia water reaches saturation, the excess H ₂ All of S exists in the gas phase, which raises the pressure of the gas phase in the device. After the temperature was lowered to room temperature, H ₂ S was completely dissolved in aqueous ammonia, and the pressure dropped to normal pressure.

(6) Pre-coating experiment: First, sand the surface of the pre-coating probe to be tested step by step with water sandpaper to 800#, rinse with acetone and deionized water successively, scrub with absolute ethanol, dry it with cold air and put it in a desiccator. The pre-membrane probe is installed on the pre-membrane device. During the installation process, the positioning is accurate to ensure that the working surface of the pre-membrane probe is flush with the inner wall of the pre-membrane device.

Embodiment Utilize scanning electron microscope (SEM), X-ray photon spectrum (XPS), X-ray diffraction (XRD) to observe corrosion appearance, analyze corrosion product characteristic, carry out fluid dynamics simulation analysis through the test process with erosion device The obtained results are compared and analyzed, and the erosion corrosion law of the pipeline system under the erosion effect of high-pressure single-phase flow is studied, the critical conditions of erosion corrosion are obtained, and the erosion corrosion critical corrosion database is constructed. The specific test sequence of the erosion critical characteristics is as follows: sample preparation→experiment preparation→erosion critical characteristics test.

(1) Sample preparation: Before the corrosion test, the surface of the electrochemical test sensor to be tested was polished to 800# step by step with water sandpaper, rinsed with acetone and deionized water successively, scrubbed with absolute ethanol, and dried with cold air Store in a desiccator for later use.

(2) Experiment preparation: install the electrochemical test sensor embedded with the sample to be tested to the corresponding position of the test section, and position it accurately so that the end surface to be tested is flush with the inner wall. After the test piece is installed, operate according to the above-mentioned function realization method, including The air tightness test, system deoxygenation, liquid preparation, secondary deoxygenation process, electrochemical sensor pre-corrosion process are 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 to test the transient characteristics of erosion under different control factors.

(3) Erosion critical characteristic test: The sample to be corroded is pre-corroded in a specified corrosion environment. After completion, electrochemical tests are carried out according to the experimental plan, and the open circuit potential, Tafel curve, and AC impedance spectrum of the corrosion product film are tested under different control factors. , by comparing and analyzing the above electrochemical parameters, the critical characteristics of erosion damage to the corrosion product film are obtained.

During the implementation of the present invention, according to the preliminary calculation and analysis results, the arrangement of sensors in the above-mentioned typical high-corrosion high-risk areas can realize the accurate and economical data collection of the test section under the condition of a small number of sensors.

Claims (5)

1. a kind of detachable loop-type single-phase flow wash-out testing device, it is characterised in that：Including fluid reservoir (1), heater (2), Flow control valve (3), magnetic drive pump (4), straight tube pipeline (5), the first shut-off valve (6), test section (7), the second shut-off valve (8), automatic instrument control system (9), pressure-control valve (13), second pressure gauge (14), air bleeding valve (15), safety valve (16), Inlet valve (17), liquid level gauge (18), blow valve (19) and electrochemical test sensor (20-35)；Fluid reservoir (1), which is internally provided with, to be added Hot device (2), fluid reservoir (1) outlet at bottom are connect with the arrival end of magnetic drive pump (4), the outlet end warp of magnetic drive pump (4) Flow control valve (3) is connected to the centre entrance of fluid reservoir (1), while the first shut-off valve of outlet end of magnetic drive pump (4) (6) it is connected to the arrival end of test section (7), the outlet end of test section (7) is successively through the second shut-off valve (8), pressure-control valve (13) the upper side entrance of fluid reservoir (1) is connected to after；The charging for test raw material to be added is connected at the top of fluid reservoir (1) Valve (17), fluid reservoir (1) side arrangement have liquid level gauge (18), the top layout of fluid reservoir (1) to have safety valve (16), air bleeding valve (15) and second pressure gauge (14), the top layout of fluid reservoir have blow valve (19).

2. a kind of detachable loop-type single-phase flow wash-out testing device according to claim 1, it is characterised in that：Further include Automatic instrument control system (9), the pipeline between the second shut-off valve (8) and pressure-control valve (13) are equipped with first pressure gauge (11), thermometer (10) and flowmeter (12), automatic instrument control system (9) are separately connected second pressure gauge (14), the first pressure Power table (11), thermometer (10) and flowmeter (12).

3. a kind of detachable loop-type single-phase flow wash-out testing device according to claim 1, it is characterised in that：Described Magnetic drive pump (4) is connected by straight tube pipeline (5) between the first shut-off valve (6), flow control valve (3) respectively, and second It is connected by straight tube pipeline (5) between shut-off valve (8) and pressure-control valve (13).

4. a kind of detachable loop-type single-phase flow wash-out testing device according to claim 1, it is characterised in that：Experiment is former Material enters from inlet valve (17) in fluid reservoir (1), and heated device (2) heating is divided into two-way by magnetic drive pump (4) output, It is flowed back into fluid reservoir (1) through flow control valve (3) all the way, another way enters test section (7), experiment through the first shut-off valve (6) Fluid reservoir (1), the second shut-off valve (8) and pressure are flowed back to after the second shut-off valve (8) and pressure-control valve (13) after section (7) output Being transmitted to certainly by thermometer (10), first pressure gauge (11), flowmeter (12) gathered data on the way between control valve (13) Dynamic blind controller system (9).

5. a kind of detachable loop-type single-phase flow wash-out testing device according to claim 1, it is characterised in that：Described Test section (7) is 1/4 circular arc pipeline configuration, is disposed with electrochemical test sensor (20-35) above, concrete arrangement is： Test section (7) is divided into the three cross-talk arc sections that respectively corresponding central angle is 30 ° of degree, per the inside edge camber line (71) of cross-talk arc section Test section (7) pipe surface of midpoint be equipped with electrochemical test sensor (20,21,22), per the outer of cross-talk arc section Test section (7) pipe surface of outer edge camber line (72) joint of edge camber line (72) midpoint and adjacent sub- arc section is equal Electrochemical test sensor (25,26,27,28,29)；Test section (7) pipe surface inside edge camber line (71) respectively to two A parallel camber line is respectively made in centre of the side of side between camber line (73), as interior parallel camber line (74), parallel arc in two Test section (7) pipe surface of line (74) midpoint is provided with electrochemical test sensor (23,24)；In test section (7) pipeline The outer edge camber line (72) on surface arrives centre of the side of both sides between camber line (73) and respectively makees a parallel camber line respectively, as Outer parallel camber line (75), two outer parallel camber lines (75) are divided into the three cross-talk circular arc lines that respectively corresponding central angle is 30 ° of degree, often Test section (7) pipe surface of cross-talk circular arc line midpoint is equipped with electrochemical test sensor (30,33,31,34,32,35).