Erosion corrosion test assembly and evaluation method thereof

Abstract

The invention particularly relates to an erosion corrosion test assembly and an evaluation method thereof, and belongs to the technical field of erosion corrosion tests. The erosion corrosion test assembly comprises a detachable test parent part and a test part; the test parent part is used for mounting and fixing the test part; the test piece is used for erosion corrosion test. The evaluation method of the erosion corrosion test assembly is used for evaluating the erosion corrosion resistance of the metal material under the given working condition. Quantitative evaluation of the erosion corrosion resistance of the material under the given working condition is achieved, and pipeline design and material selection are effectively guided.

Description

Technical Field

[0001] The present invention relates to the technical field of erosion-corrosion tests, and particularly to an erosion-corrosion test assembly and an evaluation method thereof. Background Art

[0002] The erosion-corrosion phenomenon of gas-liquid two-phase flow widely exists in industries such as nuclear power, petroleum, chemical industry, and shipbuilding, especially in important equipment such as wet steam pipelines. Erosion-corrosion damage is local thinning, with a fast thinning rate, and can cause pipeline perforation and leakage in a short time, seriously threatening the reliability and operation safety of the power system. Therefore, the research on the erosion-corrosion of gas-liquid two-phase flow is very important.

[0003] There are many factors affecting the erosion-corrosion of gas-liquid two-phase flow, mainly including three categories: working conditions, materials, and flow fields. Among them, the working condition factors include temperature, humidity, and pressure, the material factors include hardness, toughness, and surface roughness, and the flow field factors include shear force and impact force.

[0004] The erosion-corrosion test of gas-liquid two-phase flow belongs to high-temperature and high-pressure tests. The overall components such as elbows, tees, and orifice plates are used as test pieces, and the uniform corrosion evaluation methods such as the weight loss method are used to evaluate the corrosion resistance of materials. The uniform corrosion evaluation method evaluates the corrosion resistance of materials by obtaining the mass difference of the test piece before and after the test, and dividing it by the test duration and the test area to obtain the average corrosion rate.

[0005] However, since the test piece is an overall component, and the erosion-corrosion of gas-liquid two-phase flow belongs to local thinning, with a small thinning area and thinning amount, there are the following two limitations in using the uniform corrosion evaluation method to evaluate the erosion-corrosion resistance of the overall component:

[0006] (1). The test area used to calculate the average corrosion rate is much larger than the actual erosion-corrosion area;

[0007] (2). Since the thinning amount caused by erosion-corrosion is small, the weight increase caused by high-temperature oxidation has a great influence on the evaluation result of the corrosion resistance;

[0008] (3). It is impossible to effectively and detailedly record the initial morphology inside the test piece.

[0009] The existing test pieces and uniform corrosion evaluation methods cannot effectively evaluate the erosion-corrosion of gas-liquid two-phase flow, that is, under a given working condition, it is impossible to quantitatively evaluate the erosion-corrosion resistance of different materials, and it is impossible to effectively guide pipeline design and material selection. Summary of the Invention

[0010] The purpose of the present invention is to provide an erosion-corrosion test assembly and an evaluation method thereof, to realize the quantitative evaluation of the erosion-corrosion resistance of metal materials under a given working condition, and to effectively guide pipeline design and material selection.

[0011] To achieve the above object, on the one hand, the present invention provides a erosion-corrosion test assembly, including a detachable test master part and test pieces; the test master part is used for installing and fixing the test pieces; the test pieces are used for erosion-corrosion tests.

[0012] As one possible implementation, the test master part is an elbow; both the outer ridge and the inner ridge of the elbow are provided with branch pipes for installing test pieces; the inner diameter of the upper half of the branch pipe is larger than that of the lower half, and the inner surface of the upper half of the branch pipe is provided with threads; a boss is formed at the reduced-diameter part of the branch pipe; both ends of the test master part are machined with flanges and are connected in the test loop through bolts.

[0013] As one possible implementation, the outer ridge of the elbow is provided with 5 branch pipes; the inner ridge of the elbow is provided with 2 branch pipes; 1 branch pipe is used for installing 1 test piece.

[0014] As one possible implementation, the test pieces are manufactured by machining; the whole test piece is a cube.

[0015] The front surface of the test piece is provided with an erosion surface, and the erosion surface is machined into the shape of an inner arc surface; the back surface of the test piece is machined with screw holes and positioning points; the flow direction marks are printed on the side surface of the test piece by a laser marking machine.

[0016] The test piece is installed in the branch pipe according to the flow direction marks on the side surface, the erosion surface is fitted with the inner wall of the test master part, and the back surface is connected with a pin through the screw hole; a PEEK gasket is arranged between the test piece and the pin and the branch pipe for insulation, and a taper thread plug is arranged in the upper half of the branch pipe to be in threaded fit with the inner surface of the branch pipe for sealing.

[0017] As one possible implementation, the erosion surface of the test piece is gradually polished with sandpaper to 600 mesh.

[0018] As one possible implementation, the test loop includes a feed water loop and a wet steam loop; the feed water loop includes a condenser, a make-up water pump, a water tank and a feed water pump; the wet steam loop includes a mixer and a pressure stabilizing tank.

[0019] The pressure stabilizing tank is provided with a make-up water inlet and a dry steam outlet, the water tank is provided with a feed water outlet, a make-up water outlet and a condensate inlet, and the mixer is provided with a feed water inlet, a dry steam inlet and a wet steam outlet.

[0020] The dry steam outlet is connected with the dry steam inlet through a dry steam pipe, the make-up water outlet is connected with the make-up water inlet through a make-up water pipe, the feed water outlet is connected with the feed water inlet through a feed water pipe, the wet steam outlet is connected with the erosion-corrosion test assembly through a wet steam pipe, and the condensate inlet is connected with the erosion-corrosion test assembly through a condensate pipe.

[0021] Pressure gauges, thermometers, flow meters and regulating valves are provided on the dry steam pipeline; pressure gauges and thermometers are provided on the wet steam pipeline, feed pumps, pressure gauges, thermometers, flow meters and regulating valves are provided on the feed water pipeline, pressure gauges and thermometers are provided on the wet steam pipeline, condensers are provided on the condensate pipeline, and make-up pumps are provided on the make-up water pipeline.

[0022] To achieve the above object, on the other hand, the present invention also provides a method for evaluating an erosion-corrosion test assembly, comprising the following steps:

[0023] Step 1, record the initial information of the test piece: Before the erosion-corrosion test, measure and record the size of the test piece; ultrasonically clean the test piece and then dry it; use a stereomicroscope to measure the thickness of the test piece at 2-4 positions and take the maximum value; use a laser confocal microscope, select a certain magnification, and take the highest point of the front end point and the lowest point of the front center of the test piece as the scanning range of the laser confocal microscope to obtain the initial three-dimensional morphology data of the test piece.

[0024] Step 2, install the test piece: Install the test piece on the test master piece; connect the flanges at both ends of the test master piece to the test loop through bolts.

[0025] Step 3, adjust the test loop to the given working condition: The test loop controls the dry steam and feed water flow rates to the given working condition through a regulating valve, and monitors the thermal parameters through a flow meter, a thermometer and a pressure gauge.

[0026] Step 4, conduct the erosion-corrosion test: After the test loop runs stably, record the thermal parameters, and at the same time record the start time and end time of the test.

[0027] Step 5, record the information of the test piece after the test: After the erosion-corrosion test, take out the test piece; remove rust from the test piece; ultrasonically clean the test piece and then dry it; use a stereomicroscope to measure the thickness of the test piece at 2-4 positions and take the maximum value; use a laser confocal microscope, select the same magnification as in Step 1, and take the highest point of the front edge end point and the lowest point of the front center of the test piece as the scanning range of the laser confocal microscope to obtain the three-dimensional morphology data of the test piece after the test.

[0028] Step 6, calculate the erosion-corrosion rate of the test piece: Read the initial three-dimensional morphology data and the three-dimensional morphology data after the test of the test piece through matlab software, and calculate the erosion-corrosion rate of the test piece.

[0029] Step 7, evaluate the erosion-corrosion resistance of the material: Sort out the thermal data of the erosion-corrosion test to obtain the operating parameters of the gas-liquid two-phase flow, and combine the volume loss method to obtain the anti-erosion-corrosion rate of the erosion-corrosion test material at different impact angles under the test working conditions.

[0030] As one of the feasible ways, in step six, the erosion-corrosion rate of the test piece includes the volume loss v at a single position of the test piece ij , the erosion-corrosion rate r at a single position of the test piece ij , the average erosion-corrosion rate r of the test piece and the maximum erosion-corrosion rate r of the test piece max .

[0031] As one of the feasible ways, calculate the volume loss v at a single position of the test piece according to the following formula ij :

[0032]

[0033] Calculate the erosion-corrosion rate r at a single position of the test piece according to the following formula ij :

[0034]

[0035] Calculate the average erosion-corrosion rate of the test piece according to the following formula

[0036]

[0037] Calculate the maximum erosion-corrosion rate r of the test piece according to the following formula max :

[0038] r max = Max(r ij )

[0039] Wherein, n is the number of three-dimensional topography data points in the length direction of the test piece; m is the number of three-dimensional topography data points in the width direction of the test piece; a is the length of the test piece, in mm; b is the width of the test piece, in mm; a ij is the initial three-dimensional topography height data of the test piece, in mm; b ij is the three-dimensional topography height data of the test piece after the test, in mm; h a is the initial maximum thickness of the test piece 2-4, in mm; h b is the maximum thickness of the test piece 2-4 after the test, in mm; T is the test time, in h.

[0040] As one of the feasible ways, in step one, the magnification of the laser confocal microscope is 20-100 times; in step two, determine the unique installation position of the test piece according to the flow direction mark on the side of the test piece and the positioning point on the back.

[0041] The beneficial effects of the present invention are as follows:

[0042] The erosion-corrosion test assembly and its evaluation method of the present invention can quantitatively evaluate the erosion-corrosion resistance of materials under given working conditions by obtaining the three-dimensional topography information of the test piece before and after the test, effectively guiding pipeline design and material selection; the test mother piece is detachable and in series, which can improve the test efficiency, shorten the test cycle and reduce the test cost; the test piece is small in volume and convenient to install, and erosion-corrosion data at different positions can be obtained; the surface state of the test piece can be controlled to study the erosion-corrosion resistance of the same material with different surface states; it can be extended to the comparative study of the mass, internal macroscopic topography, damage characteristics and erosion pit depth of the test piece before and after the test; it can be applied to the performance evaluation of other high-temperature corrosion or damage types. Description of the Drawings

[0043] Figure 1 FIG. is a schematic structural diagram of an embodiment of the test loop;

[0044] Figure 2 FIG. is an assembly drawing of an embodiment of the erosion-corrosion test assembly;

[0045] Figure 3 FIG. is a schematic structural diagram of an embodiment of the test mother piece;

[0046] Figure 4 FIG. is a schematic structural diagram of an embodiment of the test piece;

[0047] Figure 5 FIG. is a schematic structural diagram of an embodiment of the sealing plug;

[0048] Figure 6 FIG. is a schematic structural diagram of an embodiment of the PEEK gasket;

[0049] Figure 7 FIG. is a schematic structural diagram of an embodiment of the pin.

[0050] In the figure, 1, wet steam circuit; 2, erosion-corrosion test assembly; 3, feed water circuit; 1-1, mixer; 1-2, pressure stabilizing tank; 2-1, test mother piece; 2-2, sealing plug; 2-3, pin; 2-4, test piece; 2-5, PEEK gasket; 3-1, condenser; 3-2, make-up water pump; 3-3, water tank; 3-4, feed water pump. Detailed Embodiments

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used in the description of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0052] Reference to "embodiment" in this text means that the specific features, structures, or characteristics described in connection with the embodiment may be included in at least one embodiment of the present application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment each time, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein may be combined with other embodiments.

[0053] In the description of the present invention, unless otherwise clearly specified and defined, terms such as "arranged", "installed", "connected", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances. The term "comprising", "including", or any other variant thereof is intended to cover non-exclusive inclusion, and in addition to the listed elements, it may also include other elements not explicitly listed.

[0054] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings and specific embodiments.

[0055] See Figures 1-7 , this embodiment provides a erosion-corrosion test assembly 2, including a detachable test master part 2-1 and a test piece 2-4; the test master part 2-1 is used for installing and fixing the test piece 2-4; the test piece 2-4 is used for erosion-corrosion tests.

[0056] In this embodiment, as one possible implementation, the test master part 2-1 is a cast elbow, with an outer diameter of 22 mm, a wall thickness of 2 mm, a bending radius of 27 mm, and the material is 304 stainless steel; both the outer ridge and the inner ridge of the elbow are provided with branch pipes for installing the test piece 2-4; the inner diameter of the upper half of the branch pipe is larger than that of the lower half, and the inner surface of the upper half of the branch pipe is provided with threads; a boss is formed at the reduced diameter of the branch pipe for cooperation with the PEEK gasket 2-5; both ends of the test master part 2-1 are machined with flanges and are connected in the test circuit through bolts.

[0057] In this embodiment, as one possible implementation, the outer ridge of the elbow is provided with 5 branch pipes; the inner ridge of the elbow is provided with 2 branch pipes; 1 branch pipe is used for installing 1 test piece 2-4.

[0058] In this embodiment, as one possible implementation, the test piece 2-4 is manufactured by machining; the test piece 2-4 is an overall cube of 5 mm × 5 mm × 4.6 mm, where the 5 mm × 5 mm surfaces are the front and back surfaces, and 4.6 mm is the thickness of the test piece 2-4;

[0059] The 5mm×5mm front surface of test piece 2-4 is the scouring surface, which is processed into an inner arc shape; on the back surface of test piece 2-4, there are tapped holes with a diameter of 3mm and a depth of 2.5mm and positioning points; on the side surface of test piece 2-4, flow direction marks are printed by a laser marking machine.

[0060] Test piece 2-4 is installed in the branch pipe according to the flow direction marks on the side surface, the scouring surface is fitted to the inner wall of test mother piece 2-1, and the back surface is connected to the pin 2-3 through the tapped hole; between test piece 2-4 and pin 2-3 and the branch pipe, a non-tight-fitting PEEK gasket 2-5 is provided for insulation, and a tapered thread plug 2-2 is provided on the upper half of the branch pipe to be thread-fitted with the inner surface of the branch pipe for sealing.

[0061] In this embodiment, as one of the realizable ways, the scouring surface of test piece 2-4 is gradually polished with sandpaper to 600 meshes.

[0062] See Figure 1 , in this embodiment, as one of the realizable ways, the test loop includes a feed water loop 3 and a wet steam loop 1; the feed water loop 3 includes a condenser 3-1, a make-up water pump 3-2, a water tank 3-3 and a feed water pump 3-4; the wet steam loop 1 includes a mixer 1-1 and a pressure stabilizing tank 1-2;

[0063] On the pressure stabilizing tank 1-2, there are a make-up water inlet and a dry steam outlet; on the water tank 3-3, there are a feed water outlet, a make-up water outlet and a condensate inlet; on the mixer 1-1, there are a feed water inlet, a dry steam inlet and a wet steam outlet;

[0064] The dry steam outlet is connected to the dry steam inlet through a dry steam pipeline, the make-up water outlet is connected to the make-up water inlet through a make-up water pipeline, the feed water outlet is connected to the feed water inlet through a feed water pipeline, the wet steam outlet is connected to the scouring and corrosion test assembly 2 through a wet steam pipeline, and the condensate inlet is connected to the scouring and corrosion test assembly 2 through a condensate pipeline;

[0065] On the dry steam pipeline, there are a pressure gauge, a thermometer, a flowmeter and a regulating valve; on the wet steam pipeline, there are a pressure gauge and a thermometer, on the feed water pipeline, there are a feed water pump 3-4, a pressure gauge, a thermometer, a flowmeter and a regulating valve, on the wet steam pipeline, there are a pressure gauge and a thermometer, on the condensate pipeline, there is a condenser 3-1, and on the make-up water pipeline, there is a make-up water pump 3-2.

[0066] Working principle of the test loop: The dry steam produced by the pressure stabilizing tank 1-2 enters the dry steam pipeline through the dry steam outlet, and then enters the mixer 1-1 through the dry steam inlet; the water in the water tank 3-3 enters the water supply pipeline as feed water through the water supply pump 3-4 through the water supply outlet, and then enters the mixer 1-1 through the water supply inlet; the water in the water tank 3-3 enters the pressure stabilizing tank 1-2 as make-up water through the make-up water pump 3-2 through the make-up water outlet and then through the make-up water inlet; the dry steam and the feed water are mixed in the mixer 1-1 to generate wet steam, which passes through the wet steam pipeline and the erosion-corrosion test assembly 2 successively through the wet steam outlet, and then enters the condensate pipeline, and forms condensate through the condenser 3-1 and enters the water tank 3-3 through the condensate inlet; the test loop can adjust thermal parameters such as temperature, pressure, and flow rate, and monitors thermal parameters such as temperature, pressure, and flow rate through a thermometer, a pressure gauge, and a flow meter.

[0067] This embodiment also provides an evaluation method for the erosion-corrosion test assembly, including the following steps:

[0068] Step 1: Record the initial information of the test piece 2-4:

[0069] Before the erosion-corrosion test, measure and record the size of the test piece 2-4; ultrasonically clean the test piece 2-4 with absolute ethanol, and then dry it. Measure the thickness of the test piece 2-4 with a stereomicroscope and take the maximum value; use a laser confocal microscope, select an appropriate magnification, and take the highest point of the front end point and the lowest point of the front center of the test piece 2-4 as the scanning range of the laser confocal microscope to obtain the initial three-dimensional morphology data of the test piece 2-4.

[0070] Step 2: Install the test piece 2-4:

[0071] Install the test piece 2-4 on the test master piece 2-1. With the vertical direction as 0°, install one test piece 2-4 at each of the 0°, 22.5°, 45°, 67.5°, and 90° positions of the outer ridge of the elbow, and install one test piece 2-4 at each of the 15° and 75° positions of the inner ridge of the elbow; connect the flanges at both ends of the test master piece 2-1 to the test loop through bolts.

[0072] Step 3: Adjust the test loop to the given working condition:

[0073] The test loop controls the flow rates of dry steam and feed water to the given working condition through a regulating valve, and monitors thermal parameters such as flow rate, temperature, and pressure through a flow meter, a thermometer, and a pressure gauge.

[0074] Step 4: Conduct the erosion-corrosion test:

[0075] After the test loop runs stably, record the parameters of the flow meter, the thermometer, and the pressure gauge, and at the same time record the start time and the end time of the test.

[0076] Step 5. Record the information of the test piece 2-4 after the test:

[0077] After the erosion-corrosion test, take out the test piece 2-4; remove rust from the test piece 2-4 using a brush; perform ultrasonic cleaning on the test piece 2-4 with absolute ethanol, and then dry it; measure the thickness of the test piece 2-4 using a stereomicroscope and take the maximum value; use a laser confocal microscope, select the same magnification as in Step 1, and take the highest point at the front edge endpoint and the lowest point at the front center of the test piece 2-4 as the scanning range of the laser confocal microscope to obtain the three-dimensional topography data of the test piece 2-4 after the test;

[0078] Step 6. Calculate the erosion-corrosion rate of the test piece 2-4:

[0079] Read the initial three-dimensional topography data and the three-dimensional topography data after the test of the test piece 2-4 through matlab software, and calculate the erosion-corrosion rate of the test piece 2-4;

[0080] Step 7. Evaluate the erosion-corrosion resistance of the material:

[0081] Sort out the thermal engineering data of the erosion-corrosion test to obtain the operating parameters such as the temperature, flow rate, and steam content of the vapor-liquid two-phase flow, and combine the volume loss method to obtain the erosion-corrosion resistance rate of the erosion-corrosion test material under different impact angles under the test conditions.

[0082] In this embodiment, as one of the achievable ways, in Step 6, the erosion-corrosion rate of the test piece 2-4 includes the volume loss v of a single position of the test piece 2-4 ij , the erosion-corrosion rate r of a single position of the test piece 2-4 ij , the average erosion-corrosion rate of the test piece 2-4 and the maximum erosion-corrosion rate r of the test piece 2-4 max ;

[0083] Calculate the volume loss v of a single position of the test piece 2-4 according to the following formula ij :

[0084]

[0085] Calculate the erosion-corrosion rate r of a single position of the test piece 2-4 according to the following formula ij :

[0086]

[0087] Calculate the average erosion-corrosion rate of the test piece 2-4 according to the following formula

[0088]

[0089] Calculate the maximum erosion-corrosion rate r of the test piece 2-4 according to the following formula max :

[0090] r max = Max(r ij )

[0091] where n is the number of three-dimensional topography data points in the length direction of the test piece 2-4; m is the number of three-dimensional topography data points in the width direction of the test piece 2-4; a is the length of the test piece 2-4, in mm; b is the width of the test piece 2-4, in mm; a ij is the initial three-dimensional topography height data of the test piece 2-4, in mm; b ij is the three-dimensional topography height data of the test piece 2-4 after the test, in mm; h a is the initial maximum thickness of the test piece 2-4, in mm; h b is the maximum thickness of the test piece 2-4 after the test, in mm; T is the test time, in h.

[0092] In this embodiment, as one of the realizable ways, in step one, the magnification of the laser confocal microscope is 20-100 times; determine the unique installation position of the test piece 2-4 according to the flow direction mark on the side and the positioning point on the back of the test piece 2-4.

[0093] The above-described embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, all of which belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims

1. A erosion-corrosion test assembly, characterized in that It includes a detachable test mother part (2-1) and a test part (2-4); the test mother part (2-1) is used to install and fix the test part (2-4); the test part (2-4) is used for erosion-corrosion test.

2. The erosion-corrosion test assembly according to claim 1, characterized in that, The test mother part (2-1) is an elbow; both the outer ridge and the inner ridge of the elbow are provided with branch pipes for installing the test part (2-4); the inner diameter of the upper half of the branch pipe is larger than that of the lower half, and the inner surface of the upper half of the branch pipe is provided with threads; a boss is formed at the reduced diameter of the branch pipe; both ends of the test mother part (2-1) are machined with flanges and are connected to the test loop through bolts.

3. The erosion-corrosion test assembly according to claim 2, wherein, The outer ridge of the elbow is provided with 5 branch pipes; the inner ridge of the elbow is provided with 2 branch pipes; 1 branch pipe is used to install 1 test part (2-4).

4. The erosion-corrosion test assembly according to claim 2, wherein, The test part (2-4) is manufactured by machining; the whole test part (2-4) is a cube. The front of the test part (2-4) is provided with an erosion surface, and the erosion surface is machined into the shape of an inner arc surface; the back of the test part (2-4) is machined with screw holes and positioning points; the flow direction mark is printed on the side of the test part (2-4) by a laser marking machine. The test part (2-4) is installed in the branch pipe according to the flow direction mark on the side, the erosion surface is attached to the inner wall of the test mother part (2-1), and the back is connected with a pin (2-3) through the screw hole; a PEEK gasket (2-5) is arranged between the test part (2-4) and the pin (2-3) and the branch pipe for insulation, and a taper thread plug (2-2) is arranged between the bosses on the upper half of the branch pipe to be in threaded fit with the inner surface of the branch pipe for sealing.

5. The erosion-corrosion test assembly according to claim 4, characterized in that The erosion surface of the test part (2-4) is gradually polished with sandpaper to 600 meshes.

6. The erosion-corrosion test assembly according to claim 1, characterized in that, The test loop includes a feed water loop (3) and a wet steam loop (1); the feed water loop (3) includes a condenser (3-1), a make-up water pump (3-2), a water tank (3-3) and a feed water pump (3-4); the wet steam loop (1) includes a mixer (1-1) and a pressure stabilizing tank (1-2). The pressure stabilizing tank (1-2) is provided with a make-up water inlet and a dry steam outlet, the water tank (3-3) is provided with a feed water outlet, a make-up water outlet and a condensate inlet, and the mixer (1-1) is provided with a feed water inlet, a dry steam inlet and a wet steam outlet. The dry steam outlet and the dry steam inlet are connected through a dry steam pipeline, the make-up water outlet and the make-up water inlet are connected through a make-up water pipeline, the feed water outlet and the feed water inlet are connected through a feed water pipeline, the wet steam outlet and the erosion-corrosion test assembly are connected through a wet steam pipeline, and the condensate inlet and the erosion-corrosion test assembly are connected through a condensate pipeline. A pressure gauge, a thermometer, a flowmeter and a regulating valve are arranged on the dry steam pipeline; a pressure gauge and a thermometer are arranged on the wet steam pipeline, a feed water pump (3-4), a pressure gauge, a thermometer, a flowmeter and a regulating valve are arranged on the feed water pipeline, a pressure gauge and a thermometer are arranged on the wet steam pipeline, a condenser (3-1) is arranged on the condensate pipeline, and a make-up water pump (3-2) is arranged on the make-up water pipeline.

7. An evaluation method for an erosion-corrosion test assembly, comprising the following steps: Step 1: Record the initial information of the test part (2-4): Before the erosion-corrosion test, measure and record the dimensions of the test piece (2-4); ultrasonically clean the test piece (2-4), and then dry it; use a stereo microscope to measure the thickness of the test piece 2-4 and take the maximum value; use a laser confocal microscope, select a certain magnification, and take the highest point of the front end point and the lowest point of the front center of the test piece (2-4) as the scanning range of the laser confocal microscope to obtain the initial three-dimensional topography data of the test piece (2-4); Step Two: Install the test piece (2-4): Install the test piece (2-4) on the test master piece (2-1); connect the flanges at both ends of the test master piece (2-1) to the test loop through bolts; Step Three: Adjust the test loop to the given working condition: The test loop controls the dry steam and feed water flow to the given working condition through a control valve, and monitors the thermal parameters through a flow meter, a thermometer and a pressure gauge; Step Four: Conduct the erosion-corrosion test: After the test loop runs stably, record the thermal parameters, and at the same time record the start time and end time of the test; Step Five: Record the post-test information of the test piece (2-4): After the erosion-corrosion test, take out the test piece (2-4); remove rust from the test piece (2-4); ultrasonically clean the test piece (2-4), and then dry it; use a stereo microscope to measure the thickness of the test piece 2-4 and take the maximum value; use a laser confocal microscope, select the same magnification as in Step One, and take the highest point of the front edge end point and the lowest point of the front center of the test piece (2-4) as the scanning range of the laser confocal microscope to obtain the post-test three-dimensional topography data of the test piece (2-4); Step Six: Calculate the erosion-corrosion rate of the test piece (2-4): Read the initial three-dimensional topography data and the post-test three-dimensional topography data of the test piece (2-4) through matlab software to calculate the erosion-corrosion rate of the test piece (2-4); Step Seven: Evaluate the erosion-corrosion resistance of the material: Sort out the thermal data of the erosion-corrosion test to obtain the operating parameters of the gas-liquid two-phase flow, and combine the volume loss method to obtain the erosion-corrosion resistance rates of the erosion-corrosion test material under different impact angles under the test working conditions.

8. The evaluation method of the erosion-corrosion test component according to claim 7, characterized in that In Step 6, the erosion-corrosion rate of the test piece (2-4) includes the volume loss v at a single position of the test piece (2-4) ij , the erosion-corrosion rate r at a single position of the test piece (2-4) ij , the average erosion-corrosion rate of the test piece (2-4) and the maximum erosion-corrosion rate r of the test piece (2-4) max .

9. The evaluation method of the erosion-corrosion test assembly according to claim 8, wherein Calculate the volume loss v of the test piece (2-4) at a single position according to the following formula ij :[[]]END]] Calculate the erosion-corrosion rate r of the test piece (2-4) at a single position according to the following formula ij : Calculate the average erosion-corrosion rate of the test piece (2-4) according to the following formula Calculate the maximum erosion-corrosion rate r of the test piece (2-4) according to the following formula max : r max = Max(r ij ) Among them, n is the number of three-dimensional topography data points in the length direction of the test piece (2-4); m is the number of three-dimensional topography data points in the width direction of the test piece (2-4); a is the length of the test piece (2-4), in mm; b is the width of the test piece (2-4), in mm; a ij is the initial three-dimensional topography height data of the test piece (2-4), in mm; b ij is the three-dimensional topography height data of the test piece (2-4) after the test, in mm; h a is the initial maximum thickness of the test piece 2-4, in mm; h b is the maximum thickness of the test piece 2-4 after the test, in mm; T is the test time, in h.

10. The evaluation method of the erosion-corrosion test component according to claim 7, characterized in that In Step One, the magnification of the laser confocal microscope is 20-100 times; in Step Two, determine the unique installation position of the test piece (2-4) according to the side flow direction mark and the back positioning point of the test piece (2-4).

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