A seawater-ice crystal two-phase flow rotating scouring corrosion test device

Abstract

The application relates to the field of low-temperature seawater corrosion tests, in particular to a seawater-ice crystal two-phase flow rotating scouring corrosion test device. A low-temperature condensate water pipe is arranged on the periphery of an ice storage water mixture container, an ice storage screen cylinder is arranged in the inner cavity of the ice storage water mixture container, and a transmission shaft extends into the inner cavity of the ice storage screen cylinder in the vertical direction; a rotating disc is arranged at the lower end of the transmission shaft, a horizontal bottom tray is arranged at the bottom of the rotating disc, and the rotating disc and the bottom tray are connected through a working electrode; a transmission gear one and a brush slip ring are arranged on the upper part of the transmission shaft, the transmission gear one is fixedly connected with the transmission shaft, and the brush slip ring is tightly connected with the transmission shaft; one end of an electrochemical test lead is connected with the working electrode, the other end of the electrochemical test lead extends into the inner hole of the transmission shaft and is connected with the transmission shaft, and the brush slip ring is connected with an electrochemical test system and the electrochemical test lead respectively. The temperature control operation of the ice storage water mixture container is convenient, and low-temperature seawater simulation test can be realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of low-temperature seawater corrosion test, in particular to a seawater-ice crystal two-phase flow rotating scouring corrosion test device. BACKGROUND

[0002] Due to the density difference between ice crystals and seawater, as a special liquid-solid two-phase fluid, under different operating conditions of the ship, the cooling system pipeline presents different degrees of heterogeneous flow characteristics, in addition, the collision between ice crystal particles in seawater also affects the flow characteristics of the two-phase flow, therefore, the seawater / ice crystal liquid-solid two-phase flow in the cooling system pipeline of the ship presents different flow characteristics, scouring corrosion rules and damage mechanisms. It is particularly crucial to explore the flow characteristics, scouring corrosion mechanism and damage mechanism of the seawater / ice crystal liquid-solid two-phase flow in the cooling system pipeline under different operating conditions of the ship. However, at present, there is a lack of evaluation device for the flow characteristics and scouring corrosion of the seawater / ice crystal liquid-solid two-phase flow in the cooling system pipeline under different operating conditions of the ship. Therefore, a seawater-ice crystal two-phase flow rotating scouring corrosion test device is built, so as to effectively evaluate the mechanical damage effect of the impact and wear of ice crystal particles on the material surface, under the interaction of mechanical damage and chemical corrosion damage, the service life of the equipment and the seawater cooling pipeline is evaluated, which has important guiding significance for the engineering design and safe operation of the seawater cooling system pipeline of the polar ship. SUMMARY

[0003] In order to solve the above problems, the purpose of the present application is to provide a seawater-ice crystal two-phase flow rotating scouring corrosion test device, which can accurately and effectively simulate the scouring corrosion condition of the seawater-ice crystal two-phase flow in the seawater cooling system pipeline of the polar ship, and can realize real-time electrochemical monitoring under high speed.

[0004] The technical scheme of the present application is as follows:

[0005] A seawater-ice crystal two-phase flow rotating scouring corrosion test device, the device comprises: an ice water mixture container, a low-temperature condensate water pipe, an ice storage net cylinder and a working electrode, and the specific structure is as follows:

[0006] The low-temperature condensate water pipe is arranged on the periphery of the ice water mixture container, the ice storage net cylinder is arranged in the inner cavity of the ice water mixture container, the ice storage net cylinder is a meshed cylindrical shape, the ice crystals and the seawater are isolated by the ice storage net cylinder, the ice crystals are located in the inner cavity of the ice storage net cylinder, the seawater is located between the periphery of the ice storage net cylinder and the inner cavity of the ice water mixture container, and the hollow transmission shaft extends to the inner cavity of the ice storage net cylinder in the vertical direction;

[0007] The lower end of the transmission shaft is connected with a horizontal rotating disc through a positioning pin, and the bottom of the rotating disc is provided with a horizontal bottom tray; the upper part of the transmission shaft is provided with a transmission gear one and a brush slip ring on the side surface, the transmission gear one is fixedly connected with the transmission shaft, and the brush slip ring is in close contact with the transmission shaft; the bottom of the rotating disc is provided with an electrochemical test lead, one end of the electrochemical test lead is connected with a working electrode, the other end of the electrochemical test lead extends into the inner hole of the transmission shaft and is connected with the transmission shaft, and the brush slip ring is connected with an electrochemical test system and the electrochemical test lead respectively.

[0008] The seawater-ice crystal two-phase flow rotating erosion corrosion test device, the ice water mixture container is a cylinder, and the top is provided with an opening, the upper part of the side is closed and provided with a water inlet, and the lower part of the side is closed and provided with a water outlet.

[0009] The seawater-ice crystal two-phase flow rotating erosion corrosion test device, the rotating disc and the bottom tray are disc-shaped, the side of the rotating disc is uniformly provided with a wedge-shaped fixed groove with a large inner side and a small outer side, the working electrode is a wedge-shaped structure corresponding to the fixed groove, and the working electrode is embedded in the fixed groove and matched with the fixed groove; after installation, the top surface of the working electrode is flush with the top surface of the rotating disc, the working surface outside the working electrode is tangent to the outer side wall of the rotating disc, and the rotating disc and the bottom tray are connected through bolts.

[0010] The seawater-ice crystal two-phase flow rotating erosion corrosion test device, the working electrode and the fixed groove are 12.

[0011] The seawater-ice crystal two-phase flow rotating erosion corrosion test device, the upper end of the transmission shaft is provided with a variable frequency speed regulating wheel, and the variable frequency speed regulating wheel is connected with a variable frequency speed regulating controller.

[0012] The seawater-ice crystal two-phase flow rotating erosion corrosion test device, the brush slip ring is connected with the electrochemical test lead through the transmission shaft and connected with the electrochemical test system through the working electrode conductive circuit, and realizes rotating conduction.

[0013] The seawater-ice crystal two-phase flow rotating erosion corrosion test device, the low-temperature condensate water pipe is spirally wound around the outer periphery of the ice water mixture container, and the low-temperature condensate water pipe is provided with a cold fluid medium.

[0014] The seawater-ice crystal two-phase flow rotating erosion corrosion test device, the inner wall of the ice water mixture container is provided with a vertical baffle, and the baffle is not less than one.

[0015] The seawater-ice crystal two-phase flow rotating erosion corrosion test device, the transmission gear one is connected with the transmission gear two through a synchronous belt, the transmission gear two is installed on the output end of the motor, and the transmission shaft and the motor are fixed on the hydraulic lifting device.

[0016] The seawater-ice crystal two-phase flow rotating scouring corrosion test device is further provided with a temperature controller, temperature sensors of the temperature controller are installed with two temperature sensing electrodes on the inner and outer sides of the ice storage net cylinder respectively, and the other end of the temperature controller is connected with the low-temperature condensate water pipe.

[0017] The present application has the following advantages and beneficial effects:

[0018] 1. The seawater-ice crystal two-phase flow rotating scouring corrosion test device can accurately and effectively simulate the scouring corrosion of the seawater-ice crystal two-phase flow in the seawater cooling pipe, and can realize real-time electrochemical test at high rotating speed, the test working electrode is convenient to disassemble and assemble in the clamping groove, the ice water mixture container is easy to clean, the temperature control operation is convenient, and low-temperature seawater simulation test can be realized.

[0019] 2. The rotating disc is convenient to separate from the test solution, the working electrode is convenient to install and disassemble, the disassembly and assembly time of the working electrode is shortened, and the test efficiency is effectively improved. DETAILED DESCRIPTION

[0020] Figure 1 It is a perspective structural schematic view of a seawater-ice crystal two-phase flow rotating scouring corrosion test device.

[0021] Figure 2 It is a sectional view of a seawater-ice crystal two-phase flow rotating scouring corrosion test device.

[0022] Figure 3 It is a sectional structural schematic view of an ice water mixture container (A-A sectional view in the figure). Figure 4

[0023] Figure 4 It is an assembly structural schematic view of a rotating disc, a transmission shaft and a motor.

[0024] Figure 5 It is an assembly top view of a rotating disc and a transmission shaft (B-B sectional view in the figure). Figure 3

[0025] Figure 6 It is a structural schematic view of a working electrode.

[0026] In the figure, 1 is an ice water mixture container, 2 is a low-temperature condensate water pipe, 3 is a variable frequency speed controller, 4 is an ice storage net cylinder, 5 is a working electrode (51 is a working surface), 6 is a rotating disc, 7 is a bottom tray, 8 is a transmission shaft, 9 is a variable frequency speed wheel, 10 is an electrochemical test lead wire, 11 is a transmission gear one, 12 is an electric brush slip ring, 13 is a baffle, 14 is a fixed groove, 15 is a positioning pin, 16 is a drain port, 17 is a synchronous belt, 18 is a water inlet, 19 is a transmission gear two, 20 is a motor, and 21 is a hydraulic lifting device. DETAILED DESCRIPTION ​​

[0027] As Figures 1-6 shown, the seawater-ice crystal two-phase flow rotating scouring corrosion test device of the application mainly comprises: an ice water mixture container 1, a low-temperature condensate water pipe 2, a variable frequency speed control device 3, an ice storage net cylinder 4, a working electrode 5, etc., and the specific structure is as follows:

[0028] The ice water mixture container 1 is cylindrical, and an opening is arranged at the top thereof, a water inlet 18 is arranged at the upper part of the side surface thereof, and a water outlet 16 is arranged at the lower part of the side surface thereof; the low-temperature condensate water pipe 2 is arranged at the periphery of the ice water mixture container 1, and a vertical baffle 13 is arranged on the inner wall of the ice water mixture container 1; the ice storage net cylinder 4 is arranged in the inner cavity of the ice water mixture container 1, the ice storage net cylinder 4 is a meshed cylindrical shape, the ice crystals and the seawater are isolated by the ice storage net cylinder 4, the ice crystals are located in the inner cavity of the ice storage net cylinder 4, the seawater is located between the periphery of the ice storage net cylinder 4 and the inner cavity of the ice water mixture container 1, and a hollow transmission shaft 8 extends into the inner cavity of the ice storage net cylinder 4 in the vertical direction.

[0029] The lower end flange of the transmission shaft 8 is connected with a horizontal rotating disc 6 through a positioning pin 15, the bottom of the rotating disc 6 is provided with a horizontal bottom tray 7, the rotating disc 6 and the bottom tray 7 are both disc-shaped, and the side surface of the rotating disc 6 is uniformly provided with “wedge-shaped” fixing grooves 14 with large inner side surface and small outer side surface; as Figure 5 , Figure 6 shown, the working electrode 5 is a “wedge-shaped” structure corresponding to the fixing grooves 14, the working electrode 5 is embedded in the fixing grooves 14 and matches the fixing grooves 14; after installation, the top surface of the working electrode 5 is flush with the top surface of the rotating disc 6, the working surface 51 on the outer side of the working electrode 5 is tangent to the outer side wall of the rotating disc 6, and the rotating disc 6 and the bottom tray 7 are connected through bolts.

[0030] The upper end of the transmission shaft 8 is provided with a variable frequency speed control wheel 9, the variable frequency speed control wheel 9 is connected with the variable frequency speed control device 3; the upper side surface of the transmission shaft 8 is provided with a transmission gear one 11 and a brush slip ring 12, the transmission gear one 11 is fixedly connected with the transmission shaft 8, and the brush slip ring 12 is tightly connected with the transmission shaft 8; the transmission gear one 11 is connected with a transmission gear two 19 through a synchronous belt 17, the transmission gear two 19 is installed on the output end of a motor 20; the bottom of the rotating disc 6 is provided with an electrochemical test lead 10, one end of the electrochemical test lead 10 is connected with the working electrode 5, the other end of the electrochemical test lead 10 extends into the inner hole of the transmission shaft 8 and is connected with the transmission shaft 8, the brush slip ring 12 is connected with an electrochemical test system and the electrochemical test lead respectively, on one hand, the brush slip ring 12 is connected with the electrochemical test lead 10 through the transmission shaft 8, and on the other hand, the brush slip ring 12 is connected with the electrochemical test system through a working electrode conductive circuit, and rotating conduction is realized.

[0031] The working electrode 5 and the fixing grooves 14 are both 12, the working electrode 5 is embedded in the fixing grooves 14, and the working electrode 5 can be conveniently rotated for scouring test.

[0032] The low-temperature condensate water pipe 2 is spirally wound on the periphery of the ice storage water mixture container 1, and the low-temperature condensate water pipe 2 is filled with cold fluid medium, so as to ensure that the ice crystals in the ice storage water mixture container 1 and seawater are controlled at-5-0 DEG C.

[0033] The baffle 13 is not less than one, and when the baffle 13 is more than two, the baffle 13 is uniform along the circumference, and the baffle 13 can uniformly mix the ice crystal particles.

[0034] The transmission shaft 8 and the motor 20 are fixed on the hydraulic lifting device 21, and the hydraulic lifting device 21 is used for driving the transmission shaft 8 to lift.

[0035] The device is also provided with a temperature controller, one end of a temperature sensor of the temperature controller is provided with two temperature sensing electrodes located at the inner and outer sides of the ice storage mesh cylinder, the other end of the temperature controller is connected with the low-temperature condensate water pipe, a temperature signal is fed back, the test solution in the ice storage water mixture container is controlled at constant temperature, and the scouring corrosion test under the low-temperature (-5-0 DEG C) environment is realized.

[0036] The implementation result shows that the high-speed rotation of the working electrode in the test solution simulates different flow characteristics and scouring corrosion conditions of the seawater / ice crystal liquid-solid two-phase fluid in the ship cooling system, basically approaches the actual use condition, the result is high in accuracy, accurate test data of the corrosion performance of the metal material under the low-temperature seawater-ice crystal flow scouring condition is provided.

Claims

1. A rotating seawater-ice crystal two-phase flow erosion corrosion test device, characterized by, The device comprises an ice water mixture container, a low-temperature condensate water pipe, an ice storage net cylinder, and a working electrode. The ice water mixture container is provided with a low-temperature condensate water pipe outside, and the ice storage net cylinder is arranged in the inner cavity of the ice water mixture container. The lower end of the transmission shaft is connected to a horizontal rotating disc through a positioning pin, and the bottom of the rotating disc is provided with a horizontal bottom tray. The upper part of the transmission shaft is provided with a transmission gear one and a brush slip ring on the side surface, the transmission gear one is fixedly connected to the transmission shaft, and the brush slip ring is in close contact with the transmission shaft. The rotating disc is provided with an electrochemical test lead at the bottom, one end of the electrochemical test lead is connected to the working electrode, the other end of the electrochemical test lead extends into the inner hole of the transmission shaft and is connected to the transmission shaft, and the brush slip ring is connected to the electrochemical test system and the electrochemical test lead.

2. The rotating seawater-ice crystal two-phase flow erosion test apparatus according to claim 1, wherein The rotating disc and the bottom tray are both disc-shaped, the side surface of the rotating disc is uniformly provided with a "wedge-shaped" fixed groove with a large inner side surface and a small outer side surface, the working electrode is in a "wedge-shaped" structure corresponding to the fixed groove, and the working electrode is embedded in the fixed groove and matched with the fixed groove.

3. The rotating seawater-ice crystal two-phase flow erosion test apparatus according to claim 1, wherein The low-temperature condensate water pipe is spirally wound outside the ice water mixture container, and the low-temperature condensate water pipe is provided with a cold fluid medium.

4. The rotating seawater-ice crystal two-phase flow erosion test apparatus according to claim 1, wherein The ice water mixture container is cylindrical, and the top is provided with an opening.

5. The rotating seawater-ice crystal two-phase flow erosion test apparatus according to claim 1, wherein The working electrode and the fixed groove are both 12.

6. The rotating seawater-ice crystal two-phase flow erosion test apparatus according to claim 1, wherein The upper end of the transmission shaft is provided with a variable frequency speed regulating wheel connected to a variable frequency speed regulating controller.

7. The rotating seawater-ice crystal two-phase flow erosion test apparatus according to claim 1, wherein The brush slip ring is connected to the electrochemical test lead through the transmission shaft and connected to the electrochemical test system through the working electrode conductive circuit, and realizes rotating conduction.

8. The rotating seawater-ice crystal two-phase flow erosion test apparatus according to claim 1, wherein The inner wall of the ice water mixture container is provided with a vertical baffle, and the number of baffles is not less than one. The transmission gear one is connected to a transmission gear two through a synchronous belt, the transmission gear two is installed at the output end of a motor, and the transmission shaft and the motor are both fixed on a hydraulic lifting device. The device is also provided with a temperature controller, one end of a temperature sensor of the temperature controller is provided with two temperature sensing electrodes located on the inner and outer sides of the ice storage net cylinder, and the other end of the temperature controller is connected to the low-temperature condensate water pipe.

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