Natural seawater natural film forming test device for copper-nickel alloy heat transfer tube

Abstract

The invention provides a copper-nickel alloy heat transfer pipe natural seawater natural film forming test device, which comprises a water pump, a seawater pipeline, at least one flusher module and a control system, seawater enters the flusher module through the water pump and the seawater pipeline, each flusher module comprises a water inlet water mixer, a water return water mixer and a heat transfer pipe, the inlet water mixer is provided with a plurality of water inlet end connectors, the return water mixer is correspondingly provided with a plurality of water outlet end connectors, one end of each heat transfer pipe is communicated with the corresponding water inlet end connector, the other end of each heat transfer pipe is communicated with the corresponding water outlet end connector, and the interiors of the inlet water mixer and the return water mixer are of labyrinth structures. The flow velocity of seawater entering different heat transfer pipes is kept consistent. By adopting the natural film-forming test device, a natural seawater natural film-forming test can be carried out on a plurality of heat transfer pipes at the same time, and by combining the positions of the water inlet end interface and the water outlet end interface and through a labyrinth structure in the water inlet and return water mixer, the same flow velocity of seawater in the heat transfer pipes with different specifications is realized, so that the natural film-forming test requirement is met; and a technical support is provided for corrosion protection of the copper-nickel alloy heat transfer pipe of ship sea communication heat exchange equipment.

Description

Technical Field

[0001] The invention relates to the field of corrosion protection of copper-nickel alloy heat transfer tubes of marine heat exchange equipment, and in particular to a natural seawater film formation test device for copper-nickel alloy heat transfer tubes. Background Art

[0002] The main components of copper-nickel alloy (iron white copper) pipes are Cu, Ni, Fe, Mn, etc. Common grades include BFe30-1-1 (B30 for short), BFe10-1.6-1 (B10 for short), etc. It can form a uniform and dense protective film layer on the surface in the natural seawater environment, thus showing good seawater corrosion resistance. At the same time, the copper ions released by copper-nickel alloy can effectively kill or inhibit the growth of marine organisms, and have good resistance to marine biofouling. Therefore, copper-nickel alloy pipes are widely used in heat exchange equipment and seawater pipe systems such as ships and coastal power plants. The common specifications of copper-nickel alloy heat transfer pipes for heat exchange equipment in ship sea-going systems are 14~20mm in outer diameter, 1.0~2.2mm in wall thickness, and 1000~6000mm in length.

[0003] The formation and evolution of the surface protective film layer of copper-nickel alloy heat transfer tubes used in heat exchange equipment of ship sea-going systems in natural seawater is a dynamic process, which is affected by many factors such as the pipe itself and the service working environment. There are areas with poor film formation in the copper-nickel alloy heat transfer tubes, which can easily cause abnormally rapid corrosion and leakage of the heat transfer tubes. GJB 4000-2000 "General Specifications for Ships Group 5 Auxiliary Systems" stipulates that the limit flow rate of copper-nickel alloy pipes in seawater systems increases with the increase of pipe diameter, and the design limit flow rate increases, but should not exceed 3.0m / s. "Copper Alloy Heat Exchangers and Pipeline Systems - Commissioning, Operation and Shutdown" published by KME, Germany in 1998 pointed out that the formation period of the protective passivation film layer on the surface of copper-nickel alloy pipes in clean oxygenated seawater is 8 to 12 weeks. The German industrial standard DIN 86004-1-2016 "Anti-corrosion design, measures and commissioning of marine and marine technical pipelines Part 1: Copper-nickel-iron pipeline systems" requires that copper-nickel alloy pipes can form a surface passivation film under flowing conditions in oxygen-rich and clean natural seawater within 14 to 90 days. Relevant industries at home and abroad have reached a consensus that copper-nickel alloy pipes can form a passivation film on the surface in oxygen-rich and clean natural flowing seawater.

[0004] In view of the importance of natural film formation of copper-nickel alloy heat transfer tubes in natural seawater, CN110567829A discloses a pipeline experimental device that simulates seawater scouring, which forms a scouring loop through a detachable pipeline and is used for scouring corrosion tests of material samples in different states. CN219117556U discloses an onshore pre-film treatment system for the inner wall of a heat transfer tube, which is suitable for heat transfer tubes with a specification of φ16×1.25×2645mm and a material of BFe30-1-1. It is used to perform pre-film treatment with land water containing oxygen at a certain flow rate to achieve the effect of corrosion prevention and leakage prevention. The above-mentioned pre-film treatment system does not involve a device for synchronously conducting film formation comparison tests on copper-nickel alloy heat transfer tubes of different specifications under different flow rate conditions in different water quality environments such as natural seawater. Summary of the invention

[0005] In view of this, the present invention aims to propose a natural seawater film formation test device for copper-nickel alloy heat transfer tubes, so as to solve the problem in the prior art of lack of a test device for simultaneously conducting natural film formation tests on copper-nickel alloy heat transfer tubes with different wall thicknesses in natural seawater environments with different flow rates.

[0006] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0007] A natural seawater film formation test device for copper-nickel alloy heat transfer tubes, comprising a water pump, a seawater pipeline, a scrubber module and a control system. Seawater enters the scrubber module through the water pump and the seawater pipeline. At least one scrubber module is provided, and each scrubber module comprises an inlet mixer, a return mixer and a heat transfer tube. The inlet mixer is provided with a plurality of inlet end interfaces, and the return mixer is provided with a plurality of outlet end interfaces correspondingly. One end of the heat transfer tube is connected to the inlet end interface, and the other end is connected to the outlet end interface. The inlet mixer and the return mixer are labyrinth structures inside, which are used to keep the flow rate of seawater entering different heat transfer tubes consistent. The natural film formation test device of the present invention can be used to conduct natural seawater natural film formation tests on multiple heat transfer tubes at the same time. Combined with the positions of the water inlet end interface and the water outlet end interface, the maze structure inside the inlet and return water mixer is used to achieve the same seawater flow rate in heat transfer tubes of different specifications, so as to meet the needs of the natural film formation test and provide technical support for the corrosion protection of copper-nickel alloy heat transfer tubes of ship seagoing heat exchange equipment.

[0008] Furthermore, one end of the heat transfer tube is connected to the water inlet interface through a connecting ball valve, a quick plug connector, and the other end is connected to the water outlet interface through a connecting ball valve, a quick plug connector. The connecting ball valve is used to control the opening, and the quick plug connector is used to realize the rapid disassembly and assembly of the heat transfer tube.

[0009] Furthermore, the water inlet interface and the water outlet interface are respectively provided with connecting ball valves, the first end of the quick connector is connected to the connecting ball valve, the second end of the quick connector is connected to the heat transfer tube, the first end includes a connecting portion and a boss located at the outer periphery of the first end, the connecting portion extends into the connecting ball valve and is connected to the connecting ball valve, the boss abuts against the outer end of the connecting ball valve, a first sealing ring is provided between the boss and the connecting ball valve, the heat transfer tube is provided with at least one groove at the connection with the quick connector, and a second sealing ring is provided between the groove and the second end of the quick connector. Through the matching relationship between the connecting ball valve, the quick connector and the heat transfer tube, it is ensured that the connection of the scrubber module remains sealed for a long time under the condition of a large range of seawater flow rate changes.

[0010] Furthermore, the scrubber module is a vertical scrubber or a horizontal scrubber, the heat transfer tubes of the vertical scrubber are placed vertically, and the heat transfer tubes of the horizontal scrubber are placed horizontally, so as to reasonably arrange multiple heat transfer tubes according to specific usage scenarios.

[0011] Furthermore, when a plurality of scrubber modules are provided, the plurality of scrubber modules are connected in series or in parallel, and the connection method of the plurality of scrubber modules can be selected according to the different specifications of the heat transfer tubes, the seawater flow rate and other requirements.

[0012] Furthermore, the natural film formation test device also includes a drain pipe, which is connected to the seawater pipeline. When the number of heat transfer tubes installed in the scrubber module is small, seawater is discharged to the outdoor seawater pool through the drain pipe to avoid the impact of excessive seawater flow on the heat transfer tube.

[0013] Furthermore, the seawater pipeline is provided with a first regulating valve and a first flow meter. According to the seawater flow rate flowing to the water inlet mixer, the seawater flow rate entering the water inlet mixer is controlled by controlling the power of the water pump and the opening of the first regulating valve, thereby controlling the seawater flow rate in each heat transfer tube.

[0014] Furthermore, each of the scrubber modules is provided with a second flow meter and a second regulating valve. The flow signal of the second flow meter provided on the scrubber module is collected and fed back to the control system, and the control system controls the second regulating valve in the corresponding pipeline to adjust the total flow of seawater entering each scrubber module.

[0015] Compared with the prior art, the copper-nickel alloy heat transfer tube natural seawater natural film formation test device described in the present invention has the following advantages:

[0016] (1) Through the design of the internal maze structure of the inlet mixer and the return mixer at both ends of the scrubber module, simulation calculation, and actual monitoring during the experiment, the flow velocity in each heat transfer tube can be made uniform, which is convenient for carrying out natural film formation experiments.

[0017] (2) Different scrubber modules are reasonably set according to the number of heat transfer tubes, seawater flow rate requirements, and space limitations of the test platform. Each scrubber module can accommodate 10 to 100 copper-nickel alloy heat transfer tubes of the same specifications, and each scrubber module can independently control and adjust the seawater flow rate.

[0018] (3) Both ends of each heat transfer tube of the scrubber module are connected with quick-connect connectors, which not only can meet the sealing requirements of seawater under high flow conditions, but also make it easy for each heat transfer tube to be removed at any time for sampling, testing and analysis. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0020] Figure 1 This is a schematic structural diagram of the natural film formation test device described in Example 1 of the present invention;

[0021] Figure 2 This is a control principle diagram of the natural film formation test device described in Example 1 of the present invention;

[0022] Figure 3 This is a schematic structural diagram of the natural film formation test device described in Example 2 of the present invention;

[0023] Figure 4 This is a control principle diagram of the natural film formation test device described in Example 2 of the present invention;

[0024] Figure 5 The present invention is a schematic structural diagram of a connecting ball valve, a quick-connect connector and a heat transfer tube.

[0025] Description of reference numerals:

[0026] 1. Inlet mixer; 2. Return mixer; 3. Heat transfer tube; 4. Connecting ball valve; 5. Quick connector; 6. First sealing ring; 7. Boss; 8. Second sealing ring; 9. Seawater pipeline; 10. Water pump; 11. Outdoor seawater pool. DETAILED DESCRIPTION

[0027] In order to make the above-mentioned objects, features and advantages of the present invention more clearly understood, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In addition, the directions involved in the following specific embodiments are briefly described: the directions or positional relationships indicated by "front", "rear", "upper", "lower", "left", "right", "top", "bottom" and the like mentioned in the embodiments refer to the directions or positional relationships shown in the accompanying drawings, and the term "on..." refers to being directly or indirectly supported by... elements.

[0028] It should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" 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, an electrical connection, or mutual communication; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] like Figure 1 or Figure 3 As shown, a natural seawater film formation test device for a copper-nickel alloy heat transfer tube of the present invention comprises a water pump 10, a seawater pipeline 9, a scrubber module and a control system. Seawater enters the scrubber module through the water pump 10 and the seawater pipeline 9. At least one scrubber module is provided, and each scrubber module comprises an inlet mixer 1, a return mixer 2 and a heat transfer tube 3. The inlet mixer 1 is provided with a plurality of inlet end interfaces, and the return mixer 2 is correspondingly provided with a plurality of outlet end interfaces. One end of the heat transfer tube 3 is connected to the inlet end interface, and the other end is connected to the outlet end interface. The inlet mixer 1 and the return mixer 2 are labyrinth structures for keeping the flow rate of seawater entering different heat transfer tubes 3 consistent.

[0030] The heat transfer tube 3 is made of copper-nickel alloy. Since the distance between the heat transfer tube 3 and the seawater pipeline 9 is different, and the heat transfer tube 3 has different specifications, the flow rate and flow rate of seawater directly entering the heat transfer tube 3 are different, but the natural film formation test requires the heat transfer tubes 3 in different states to be tested synchronously under the same flow rate conditions. Therefore, the labyrinth structure helps to achieve the same seawater flow rate in the heat transfer tube 3. After the seawater enters the water inlet mixer 1, it disperses into each heat transfer tube 3, and then converges into the return water mixer 2 and is discharged from the outdoor seawater pool 11. The natural film formation test device of the present invention can be used to perform natural seawater natural film formation tests on multiple heat transfer tubes 3 at the same time. Combined with the position of the water inlet end interface and the water outlet end interface, the labyrinth structure inside the water inlet and return water mixer can achieve the same seawater flow rate in heat transfer tubes 3 of different specifications, so as to meet the needs of the natural film formation test and provide technical support for the corrosion protection of the copper-nickel alloy heat transfer tube 3 of the ship's seagoing heat exchange equipment.

[0031] As a preferred example of the present invention, the labyrinth structure is a labyrinth regulating valve, which is composed of a plurality of metal discs with labyrinth grooves stacked on top of each other. When seawater flows through these labyrinth flow channels, it will undergo multiple collisions and turns, thereby consuming energy and facilitating effective control of the flow rate.

[0032] One end of the heat transfer tube 3 is connected to the water inlet interface through the connecting ball valve 4 and the quick plug connector 5, and the other end is connected to the water outlet interface through the connecting ball valve 4 and the quick plug connector 5. The connecting ball valve 4 is used to control the opening, and the quick plug connector 5 is used to realize the rapid disassembly and assembly of the heat transfer tube 3. After completing a certain period of film forming test, the connecting ball valves 4 at both ends of the heat transfer tube 3 are closed, and the quick plug connector 5 is opened to remove the heat transfer tube 3, so as to detect and analyze the removed heat transfer tube 3, and the remaining heat transfer tubes 3 can continue to perform heat transfer tests without being affected.

[0033] Specific to the present invention Figure 5 In the embodiment, the water inlet interface and the water outlet interface are respectively provided with a connecting ball valve 4, the first end of the quick connector 5 is connected to the connecting ball valve 4, the second end of the quick connector 5 is connected to the heat transfer tube 3, the first end includes a connecting portion and a boss 7 located at the outer periphery of the first end, the connecting portion extends into the connecting ball valve 4 and is connected to the connecting ball valve 4, the boss 7 abuts against the outer end of the connecting ball valve 4, a first sealing ring 6 is provided between the boss 7 and the connecting ball valve 4, the heat transfer tube 3 is provided with at least one groove at the connection with the quick connector 5, and a second sealing ring 8 is provided between the groove and the second end of the quick connector 5. Through the matching relationship between the connecting ball valve 4, the quick connector 5 and the heat transfer tube 3, the heat transfer tube 3 adopts a double sealing design, and the connecting ball valve 4 and the quick connector 5 adopt a full-enclosed sealing connection structure, which ensures that the connection of the flusher module remains sealed for a long time under the condition of a large range of seawater flow rate changes.

[0034] The scrubber module is a vertical scrubber or a horizontal scrubber, the heat transfer tube 3 of the vertical scrubber is placed vertically, and the heat transfer tube 3 of the horizontal scrubber is placed horizontally. The scrubber module is designed as a vertical or horizontal structure, which is convenient for reasonably arranging multiple heat transfer tubes 3 according to specific usage scenarios.

[0035] When a plurality of the scrubber modules are provided, the plurality of scrubber modules are connected in series or in parallel, and the connection mode of the plurality of scrubber modules can be selected according to the different specifications of the heat transfer tubes 3, the seawater flow rate and other requirements.

[0036] The natural film formation test device further includes a drain pipe, which is connected to the seawater pipeline 9. When the number of heat transfer tubes 3 installed in the scrubber module is small, seawater is discharged to the outdoor seawater pool 11 through the drain pipe to avoid the impact of excessive seawater flow on the heat transfer tubes 3.

[0037] Furthermore, the seawater pipeline 9 is provided with a first regulating valve and a first flow meter. The control system controls each flusher module individually, and controls the seawater flow rate entering the inlet mixer 1 by controlling the power of the water pump 10 and the opening of the first regulating valve according to the seawater flow rate flowing to the inlet mixer 1, thereby controlling the seawater flow rate in each heat transfer tube 3.

[0038] Furthermore, each scrubber module is provided with a second flow meter and a second regulating valve, and the flow signal of the second flow meter provided on the scrubber module is collected and fed back to the control system, which controls the second regulating valve in the corresponding pipeline to adjust the total flow of seawater entering each scrubber module.

[0039] Accompanying flow meters are provided on at least two heat transfer tubes 3 of the same flusher module to facilitate monitoring of the uniformity of the seawater flow rate in the heat transfer tubes 3 .

[0040] The flow velocities in the inlet mixer 1, the return mixer 2 and the heat transfer tube 3 are simulated and calculated. The fluid in each heat transfer tube 3 is evenly distributed, and the flow velocity error at the same height is small, which meets the test accuracy requirements.

[0041] The seawater pipeline 9 includes three parts: seawater immersion, outdoor ocean atmosphere exposure and test room. The seawater immersion part includes structures such as filters, pipe fittings, flanges and elbow tees. The seawater enters the scrubber module after the silt is filtered out by the filter. The outdoor ocean atmosphere exposure part adopts a flexible anti-corrosion pipeline. After entering the test room part, the seawater enters the scrubber module through the first regulating valve, pressure gauge and first flow meter.

[0042] The material of the parts in contact with seawater in the natural film formation test device should be titanium alloy or plastic resistant to seawater corrosion. The natural film formation test device should be able to operate continuously for more than one year in a natural seawater environment, and at the same time avoid the introduction of impurity elements such as iron ions during the test process to affect the test results.

[0043] The copper-nickel alloy heat transfer tube natural seawater natural film formation test device of the present invention is adopted. By designing the internal maze structure of the water inlet mixer 1 and the return water mixer 2 at both ends of the scrubber module, simulating calculations, and actual monitoring during the experiment, the flow rate in each heat transfer tube 3 can be uniform, which is convenient for carrying out natural film formation tests. The flow rate adjustment range in the heat transfer tube 3 is 0.5~5.0m / s, and the adjustment accuracy is ±0.2m / s. The present invention can also reasonably set different scrubber modules according to the number of heat transfer tubes 3, the seawater flow rate requirements, and the space limitations of the test platform. Each scrubber module can meet 10~100 copper-nickel alloy heat transfer tubes 3 of the same specifications, and each scrubber module can independently control and adjust the seawater flow rate. Both ends of each heat transfer tube 3 of the scrubber module are connected with quick-plug connectors 5, which can not only meet the sealing of seawater under high flow rate conditions, but also facilitate each heat transfer tube 3 to be removed at any time for sampling, detection and analysis. Each flusher module is provided with a parallel return water mixer 2, and the seawater flow rate in the flusher module can be controlled to vary over a wide range through the control system and the second regulating valve, while ensuring the uniformity and accuracy of the flow control of the heat transfer tube 3. Example 1

[0044] In this embodiment, if Figure 2 As shown, the scrubber module is a vertical scrubber, and is divided into a first scrubber module and a second scrubber module connected in parallel. An inlet mixer 1 is arranged at the bottom of each scrubber module, and a return mixer 2 is arranged at the top.

[0045] The first scrubber module is provided with two rows of thin-walled heat transfer tubes 3, each row has 42 tubes, and each row of thin-walled heat transfer tubes 3 is placed vertically. The second scrubber module is provided with two rows of thick-walled heat transfer tubes 3, each row has 8 tubes, and each row of thick-walled heat transfer tubes 3 is placed vertically (not all heat transfer tubes 3 are shown in the figure). The specification parameters of the thin-walled heat transfer tubes 3 and the thick-walled heat transfer tubes 3 and the parameters for the natural film formation test are shown in Table 1, where the design flow rate is the flow rate of seawater in the heat transfer tube 3. The specifications of the thin-walled heat transfer tubes 3 are The specifications of the thick-walled heat transfer tube 3 are The heat transfer tube 3 can be from different manufacturers. The designed flow rate of the natural film formation test of seawater in the heat transfer tube 3 is 3.0 m / s, which can meet the film formation tests of different flow rates such as 2.5 m / s, 3.0 m / s and 3.5 m / s, as well as the film formation tests of different cycles.

[0046] According to the number of thin-walled heat transfer tubes 3, a corresponding number of water inlet interfaces are opened on the water inlet mixer 1 of the first flusher module, and a corresponding number of water outlet interfaces are opened on the return water mixer 2. The thin-walled heat transfer tube 3 is connected to the first flusher module through a connecting ball valve 4 and a quick connector 5.

[0047] According to the number of thick-walled heat transfer tubes 3, a corresponding number of water inlet interfaces are opened on the water inlet mixer 1 of the second flusher module, and a corresponding number of water outlet interfaces are opened on the return water mixer 2. The thick-walled heat transfer tube 3 is connected to the second flusher module through a connecting ball valve 4 and a quick-connect connector 5.

[0048] In order to facilitate the operation of connecting the ball valves 4 at both ends of the heat transfer tube 3, the ball valves 4 should be staggered up and down by a certain distance when being installed.

[0049] Table 1

[0050]

[0051] The inlet and return water mixers of the first scrubber module and the second scrubber module adopt a labyrinth structure, and combined with the position design of their respective water inlet and outlet interfaces, the seawater flow rate in the heat transfer tube 3 is made the same to carry out a natural film formation test.

[0052] The seawater pipeline 9 is arranged between the first scrubber module and the second scrubber module, so that seawater can flow in from the middle of the two. The water pump 10 adopts a titanium alloy variable frequency self-priming pump with a flow rate of 150m 3 / h, head is 30m, suction head is 4.5m, specification is 1.75×0.45×0.9m. In order to ensure the reliability of the device, the titanium alloy variable frequency self-priming pump needs to be kept in one standby and one in use.

[0053] For each flusher module, a water inlet mode of bottom-in and top-out is adopted. After the seawater enters the water inlet mixer 1 through the water pump 10 and the seawater pipeline 9, it passes through the connecting ball valve 4 and the quick-connect joint 5 connected to the water inlet mixer 1 and disperses into each heat transfer tube 3, and then flows through the quick-connect joint 5 connected to the return water mixer 2 and merges into the return water mixer 2. The diameter of the return water mixer 2 is DN150, and the diameter of the inlet water mixer 1 is DN200, which is used to ensure that the heat transfer tube 3 is filled with seawater under low flow rate conditions.

[0054] The outlet of the first flusher module is provided with a flow meter FT103 and a regulating valve FV103, which are used to adjust the flow of this path and thus control the flow rate in the thin-walled heat transfer tube 3 to reach the designed flow rate. The water inlet of the second flusher module is provided with a regulating valve FV102, and the water outlet is provided with a flow meter FT102, which is used to adjust the opening of FV102, control the flow in the thick-walled heat transfer tube 3 and thus control the flow rate to reach the designed flow rate. The outlet of the water pump 10 is provided with a flow meter FT101 and a regulating valve FV101, and the flow meter FT101 calculates and controls the opening of the regulating valve FV101 through an automatic feedback control system to ensure the smooth and safe conduct of the test.

[0055] The flow velocities in the inlet mixer 1, the return mixer 2 and the heat transfer tube 3 are simulated and calculated. The fluid in each heat transfer tube 3 is evenly distributed, and the flow velocity error at the same height is 0.5%, which meets the test accuracy requirements.

[0056] After different test cycles of 15 days, 1 month, 2 months and 3 months, a certain number of heat transfer tubes 3 are removed or replaced, and the number and specifications of the remaining heat transfer tubes 3 are input into the control system. The flow rate of each flusher module can be automatically calculated by the control system, and then the opening of each valve is adjusted to control the seawater flow rate of the flusher module. At the same time, the flow meter of each flusher module pipeline feeds back the flusher module flow rate to the control system. Example 2

[0057] The specifications of the thin-walled heat transfer tube 3 and the thick-walled heat transfer tube 3 used in Example 2 are the same as those in Example 1.

[0058] like Figure 3~4As shown, the scrubber module of Example 2 adopts a horizontal scrubber with a multi-layer and multi-row structure. The scrubber module is divided into three parts. The first scrubber module is provided with 54 thin-walled heat transfer tubes 3, the second scrubber module is provided with 36 thin-walled heat transfer tubes 3, and the third scrubber module is provided with 18 thick-walled heat transfer tubes 3 (not all heat transfer tubes 3 are shown in the figure). After the first scrubber module and the second scrubber module are connected in series, they are connected in parallel with the third scrubber module to the seawater pipeline 9. The width of the scrubber module is 0.8m. The specifications and arrangement of the heat transfer tubes 3 are shown in Table 2.

[0059] Table 2

[0060]

[0061] The connection between the heat transfer tube 3, the quick-connect connector 5 and the connecting ball valve 4 is the same as that in the first embodiment.

[0062] The inlet and return water mixers of the first, second and third scrubber modules adopt a labyrinth structure, and are designed in combination with the position of their respective inlet and outlet interfaces to achieve the same seawater flow rate in the heat transfer tube 3 for natural film formation tests.

[0063] In Example 2, the water pump 10 uses a flow rate of 100m 3 / h, a submersible pump with a head of 30m, made of nickel-aluminum bronze pump, equipped with 18.5KW submersible motor, model 250QJT-100-25 / 18.5, specification Φ235×1500mm. The submersible pump is placed in a titanium alloy cage in the pit of the tidal range test platform. In order to keep the submersible pump cool, the submersible pump should be immersed in seawater and placed 1.5~3.0m away from the tidal range platform. At the same time, a layer of filter mesh is wrapped around the cage to prevent the bottom mud and marine life from entering the submersible pump.

[0064] The natural film formation test device of Example 2 uses an automatic feedback control system to control each flushing module one by one. Figure 4 As shown, the first flusher module, the second flusher module and the third flusher module are respectively provided with an electromagnetic flowmeter and an electric regulating valve. Considering that the number of heat transfer tubes 3 in the first flusher module and the second flusher module is greater than that in the third flusher module, in order to better adjust the flow rate of each heat transfer tube 3 and ensure that each heat transfer tube 3 has the same flow rate to better perform the natural film formation test, an electric regulating valve is also provided in the pipeline after the first flusher module and the second flusher module are connected in series. The number of heat transfer tubes 3 of each flusher module is set through the human-machine interface (HMI), the flow signal of the electromagnetic flowmeter is collected, and the signal is fed back to the automatic feedback control system to control the electric regulating valve in the corresponding pipeline, so as to adjust the flow rate of each flusher module to the control flow rate corresponding to the designed flow rate.

[0065] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the claims.

Claims

1. A copper-nickel alloy heat transfer tube natural seawater natural film formation test device, characterized in that: The invention comprises a water pump (10), a seawater pipeline (9), a scrubber module and a control system. Seawater enters the scrubber module through the water pump (10) and the seawater pipeline (9). At least one scrubber module is provided. Each scrubber module comprises an inlet mixer (1), a return mixer (2) and a heat transfer tube (3). The inlet mixer (1) is provided with a plurality of inlet interfaces, and the return mixer (2) is correspondingly provided with a plurality of outlet interfaces. One end of the heat transfer tube (3) is connected to the inlet interface, and the other end is connected to the outlet interface. The inlet mixer (1) and the return mixer (2) have a labyrinth structure inside, so as to keep the flow rate of seawater entering different heat transfer tubes (3) consistent.

2. The natural film formation test device according to claim 1, characterized in that: One end of the heat transfer tube (3) is connected to a water inlet interface via a connecting ball valve (4), a quick-connect joint (5), and the other end is connected to a water outlet interface via a connecting ball valve (4), a quick-connect joint (5).

3. The natural film formation test device according to claim 2, characterized in that: The water inlet interface and the water outlet interface are respectively provided with a connecting ball valve (4); the first end of the quick connector (5) is connected to the connecting ball valve (4); the second end of the quick connector (5) is connected to the heat transfer tube (3); the first end comprises a connecting portion and a boss (7) located at the outer periphery of the first end; the connecting portion extends into the interior of the connecting ball valve (4) and is connected to the connecting ball valve (4); the boss (7) abuts against the outer end of the connecting ball valve (4); a first sealing ring (6) is provided between the boss (7) and the connecting ball valve (4); the heat transfer tube (3) is provided with at least one groove at the connection with the quick connector (5); and a second sealing ring (8) is provided between the groove and the second end of the quick connector (5).

4. The natural film formation test device according to claim 1, characterized in that: The scrubber module is a vertical scrubber or a horizontal scrubber, the heat transfer tube (3) of the vertical scrubber is placed vertically, and the heat transfer tube (3) of the horizontal scrubber is placed horizontally.

5. The natural film formation test device according to claim 1, characterized in that: When a plurality of flusher modules are provided, the plurality of flusher modules are connected in series or in parallel.

6. The natural film formation test device according to claim 1, characterized in that: The natural film formation test device also includes a drain pipe, which is connected to the seawater pipeline (9).

7. The natural film formation test device according to claim 1, characterized in that: The seawater pipeline (9) is provided with a first regulating valve and a first flow meter.

8. The natural film formation test device according to claim 1, characterized in that: Each of the flusher modules is correspondingly provided with a second flow meter and a second regulating valve.

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