A corrosion resistance testing mechanism for stainless steel tubes in heat exchangers

Abstract

This utility model discloses a corrosion resistance testing mechanism for stainless steel tubes in heat exchangers, belonging to the field of steel pipe corrosion testing technology. It includes a frame on which a test cylinder is mounted. The test cylinder includes a closed base with a main body of a cover inserted into it, and a closed cover at the top of the main body. A steel pipe sample is located inside the main body of the cover, forming a corrosion chamber. A salt spray tube assembly is symmetrically installed on the main body of the cover. A corrosion solution pumping assembly is used to deliver the test corrosion solution into the test cylinder. A salt spray generator is used to deliver the test salt spray into the corrosion chamber. Its key technical features are: the device can simultaneously simulate the working conditions of the steel pipe sample under high temperature and high pressure corrosive solution and under the working conditions of the steel pipe sample in a humid saline-alkali environment, ensuring that the test results are more realistic. Furthermore, since the corrosion resistance tests under these two conditions can be performed simultaneously, the testing efficiency can be effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of steel pipe corrosion testing technology, specifically a corrosion resistance testing mechanism for stainless steel tubes in heat exchangers. Background Technology

[0002] Corrosion resistance testing of steel pipes is of great significance, serving as a crucial link in ensuring the safe and economical operation of industry. Through testing, the corrosion resistance of steel pipes in different environments can be scientifically assessed, preventing risks such as pipeline leaks and structural failures caused by corrosion, and preventing personal injury, environmental pollution, and property damage. Simultaneously, the test results provide a basis for material selection and corrosion protection design, optimizing project costs and extending the service life of steel pipes. In the energy, chemical, and construction industries, corrosion resistance testing also ensures the long-term stable operation of systems, reduces downtime for maintenance, improves overall economic efficiency, and is of great importance to promoting sustainable industrial development.

[0003] Utility model patent CN219320052U discloses a corrosion resistance testing device for chemical steel pipes. Its structure includes a reagent box containing three liquid storage tanks. A liquid heating pipe is fixedly installed at the lower end of the inner wall of each liquid storage tank. A testing chamber is fixedly connected to the upper end of the reagent box. The testing chamber has testing windows corresponding to the liquid storage tanks. A circulation pipe is fixedly connected between the upper end of the testing window and the liquid storage tank. The end of the circulation pipe near the testing window extends into the testing window and is slidably connected to an upper connector. A liquid delivery pipe is connected to the lower end of the inner wall of the testing window, and a liquid pump is fixedly installed on the liquid delivery pipe. A lower connector is fixedly connected to the end of the liquid delivery pipe located inside the testing window, corresponding to the upper connector. The lower end of the liquid delivery pipe extends into the liquid storage tank. This utility model recreates the working environment of a steel pipe when transporting high-temperature and high-pressure liquids, thereby measuring the corrosion resistance of the steel pipe during such transport.

[0004] While the aforementioned device can simulate the working environment of steel pipes transporting high-temperature and high-pressure liquids to test their corrosion resistance, the simulated working conditions are relatively simple. It can only test the corrosion resistance of the inner wall of the steel pipe under high-temperature and high-pressure liquid conditions, but cannot test the corrosion resistance of the outer wall of the steel pipe under humid and saline-alkali conditions. The working conditions of some heat exchanger steel pipes usually combine both of these situations. Therefore, it is difficult to simulate the working conditions of heat exchanger steel pipes in actual use with the aforementioned device alone, and the test results are difficult to match reality. Therefore, in order to address the above problems, a corrosion resistance testing mechanism for stainless steel tubes of heat exchangers is proposed. Utility Model Content

[0005] To address the problem that the steel pipe corrosion testing devices in comparative technologies simulate relatively simple working conditions, making it difficult to simulate the actual working conditions of heat exchanger steel pipes and thus making the test results difficult to match reality, this utility model provides a corrosion resistance testing mechanism for stainless steel heat exchanger pipes.

[0006] The technical solution adopted by the embodiments of this application to solve its technical problem is:

[0007] A corrosion resistance testing mechanism for stainless steel tubes in heat exchangers includes a frame on which a test cylinder is mounted. The test cylinder includes a closed base to which a sealed shroud body is inserted, and a sealed cover is provided at the top of the shroud body. A steel pipe sample is inserted into the closed base and located inside the shroud body, forming a corrosion chamber between the steel pipe sample and the shroud body. A salt spray tube assembly is symmetrically mounted on the shroud body and communicates with the corrosion chamber. A corrosion solution pumping assembly is used to deliver a test corrosion solution into the test cylinder and allow it to flow through the steel pipe sample. A salt spray generator is used to deliver test salt spray into the salt spray tube assembly, filling the entire corrosion chamber.

[0008] In one possible implementation, the closed base has a lower slot corresponding to the size of the steel pipe sample section, and the bottom end of the closed base is machined to form a water inlet.

[0009] In one possible implementation, the enclosure has two upper slots corresponding to the dimensions of the steel pipe section and the main body of the enclosure, respectively, and a water outlet is formed at the top of the enclosure.

[0010] In one possible implementation, a closed ring frame that engages with the closed base is fixedly provided on the inner wall of the bottom end of the cover body.

[0011] In one possible implementation, a plurality of guide rods arranged in a circular array are fixedly provided on the upper end face of the platform, and a positioning plate is provided on the outer sleeve of the closed cover, on which a plurality of guide holes corresponding to the positions of the guide rods are opened.

[0012] In one possible implementation, the salt spray tube assembly includes a ring tube with several sealed branch tubes fixedly arranged on its inner side, which are sealed to the main body of the hood, and the branch tubes are provided with sealing plugs that are bonded to the outer wall of the main body of the hood. In addition, a main tube is sealed to the ring tube.

[0013] In one possible implementation, the corrosive solution pumping assembly includes a heated storage tank with a heater inside, and a corrosion-resistant pump installed on the front side of the heated storage tank. The pump's output port is sealed to the inlet water pipe via a delivery pipe. Additionally, a recovery pipe is sealed to the outlet water pipe, with its end leading into the heated storage tank.

[0014] In one possible implementation, the salt spray generator includes a generating chamber with an ultrasonic atomizer at its bottom, a sealed delivery pipe on one side of the generating chamber, and a blower cylinder facing the delivery pipe on the other side, wherein the delivery pipe is sealed to the main pipe of the salt spray pipe group located below.

[0015] In summary, this utility model has the following beneficial technical effects:

[0016] During the test, the steel pipe sample is installed in the test cylinder. When the corrosion solution pumping assembly works to deliver the test corrosion solution into the test cylinder, the solution flows from bottom to top and fills the entire internal space of the steel pipe sample. This simulates the working conditions of the steel pipe sample when transporting a high-temperature and high-pressure corrosive solution, so as to test the corrosion resistance of its inner wall. At the same time, the salt spray generator generates salt spray and delivers it into the corrosion chamber through the salt spray tube assembly, so that the outer wall of the steel pipe sample is completely exposed to the salt spray environment. This simulates the working conditions of the steel pipe sample in a humid saline-alkali environment, so as to test the corrosion resistance of its outer wall.

[0017] Since the corrosion resistance tests under the two working conditions mentioned above can be carried out simultaneously, the time required to complete a complete test batch can be effectively shortened, thereby effectively improving the testing efficiency. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a partial structural schematic diagram of the present invention;

[0021] Figure 3 This is a schematic diagram of the test cylinder structure of this utility model;

[0022] Figure 4 This is a schematic diagram of the salt spray tube assembly structure of this utility model;

[0023] Figure 5 This is a schematic diagram of the corrosive solution pumping assembly of this utility model;

[0024] Figure 6 This is a schematic diagram of the salt spray generator structure of this utility model.

[0025] In the diagram: 1. Stand; 2. Test tube; 21. Enclosed base; 211. Lower slot; 212. Water inlet; 22. Main body of the cover; 221. Enclosed ring frame; 23. Corrosion chamber; 24. Enclosed cover; 241. Upper slot; 242. Water outlet; 25. Positioning plate; 251. Guide hole; 26. Guide rod; 3. Steel pipe sample section; 4. Salt spray tube assembly; 41. Ring pipe; 42. Branch pipe; 43. Sealing plug; 44. Main pipe; 5. Corrosion solution pumping assembly; 51. Heating storage tank; 52. Corrosion-resistant pump; 53. Infusion pipe; 54. Recovery pipe; 6. Salt spray generator; 61. Generator box; 62. Ultrasonic atomizer; 63. Delivery pipe; 64. Blower cylinder. Detailed Implementation

[0026] The technical solution in this application embodiment is to solve the problems mentioned in the background art, and the overall idea is as follows:

[0027] like Figure 1 - Figure 2 As shown, this embodiment provides a corrosion resistance testing mechanism for stainless steel tubes of heat exchangers, including a frame 1 on which a test cylinder 2 is mounted. The test cylinder 2 includes a closed base 21 on which a sealed shroud body 22 is inserted. The top of the shroud body 22 is covered with a sealed shroud 24. A steel pipe sample section 3 is inserted into the closed base 21 and located inside the shroud body 22, forming a corrosion chamber 23 between the steel pipe sample section 3 and the shroud body 22. A salt spray tube assembly 4 is symmetrically installed on the shroud body 22 and communicates with the corrosion chamber 23. A corrosion solution pumping assembly 5 is used to deliver a test corrosion solution to the test cylinder 2 and allow it to flow through the steel pipe sample section 3. A salt spray generator 6 is used to deliver test salt spray to the salt spray tube assembly 4, filling the entire corrosion chamber 23.

[0028] Based on the above structural design, the corrosion solution pumping assembly 5 can deliver the test corrosion solution to the test cylinder 2. The solution will flow from bottom to top and fill the entire internal space of the steel pipe sample 3, thereby simulating the working conditions of the steel pipe sample 3 when transporting a high-temperature and high-pressure corrosive solution, so as to conduct corrosion resistance testing on its inner wall. In addition, the salt spray generator 6 will generate salt spray and deliver it to the corrosion chamber 23 through the salt spray tube assembly 4, so that the outer wall of the steel pipe sample 3 is completely exposed to the salt spray environment, thereby simulating the working conditions of the steel pipe sample 3 in a humid saline-alkali environment, so as to test the corrosion resistance of its outer wall.

[0029] In particular, since the corrosion resistance tests under the two working conditions mentioned above can be carried out simultaneously, the time required to complete a complete test batch can be effectively shortened, thereby effectively improving the testing efficiency.

[0030] To ensure the overall sealing of test cylinder 2 and facilitate its better completion of the test, such as Figure 3As shown, the closed base 21 has a lower slot 211 corresponding to the size of the steel pipe sample 3, and the closed cover 24 has two upper slots 241 corresponding to the sizes of the steel pipe sample 3 and the cover body 22, respectively. The inner wall of the bottom end of the cover body 22 is fixedly provided with a closed ring frame 221 that engages with the closed base 21. Through the above structural scheme, the closed base 21, the cover body 22 and the closed cover 24 can be connected in a sealed manner, thereby forming a closed test environment for synchronous testing of the inner and outer walls of the steel pipe sample 3.

[0031] Meanwhile, to improve the ease of installation of the enclosure 24, such as... Figure 2 As shown, a number of guide rods 26 arranged in a circular array are fixedly installed on the upper surface of the platform 1. The enclosure 24 is covered with a positioning plate 25, which has a number of guide holes 251 corresponding to the positions of the guide rods 26. The sliding connection between the guide rods 26 and the guide holes 251 can play a guiding role, so that when the enclosure 24 is installed, the upper slot 241 on it can be precisely aligned with the top of the steel pipe sample section 3 and the main body of the cover 22, thereby improving the installation efficiency.

[0032] To achieve the cyclical transport of the corrosive solution, such as Figure 2 , Figure 5 As shown, the bottom of the closed base 21 is machined with a water inlet 212, and the top of the closed cover 24 is machined with a water outlet 242. The corrosion solution pumping assembly 5 includes a heating storage tank 51, which is equipped with a heater. A corrosion-resistant pump 52 is installed on the front side of the heating storage tank 51. Its output end interface is sealed to the water inlet 212 through a liquid delivery pipe 53. In addition, a recovery pipe 54 is sealed to the water outlet 242, and its end leads into the heating storage tank 51. When conducting corrosion solution testing, the corrosion-resistant pump 52 extracts the high-temperature corrosion solution stored in the heating storage tank 51 and delivers it to the steel pipe sample section 3 through the liquid delivery pipe 53. After the steel pipe sample section 3 is filled, it flows out from the water outlet 242 and flows back to the heating storage tank 51 through the recovery pipe 54.

[0033] To achieve salt spray testing, such as Figure 4 , Figure 6As shown, the salt spray generator 6 includes a generating chamber 61, with an ultrasonic atomizer 62 installed at its bottom. A sealed delivery pipe 63 is installed on one side of the generating chamber 61, and a blower cylinder 64 facing the delivery pipe 63 is installed on the other side. The delivery pipe 63 is sealed to the main pipe 44 of the salt spray pipe assembly 4 located below. Additionally, the salt spray pipe assembly 4 includes a ring pipe 41, with several sealed branch pipes 42 fixedly installed inside. These branch pipes are sealed to the main body 22 of the hood, and each branch pipe 42 has a sealing plug that adheres to the outer wall of the hood body 22. 43. In addition, a main pipe 44 is sealed to the ring pipe 41. Based on the above structural scheme, when the ultrasonic atomizer 62 is working, it will vibrate the salt solution stored in the generating box 61 into salt mist and spray it out. Under the action of the blower 64, it will be transported to the ring pipe 41 through the main pipe 44 via the delivery pipe 63, and finally flow into the corrosion chamber 23 evenly through the branch pipe 42, so that the outer wall of the steel pipe sample 3 is completely exposed to the salt mist environment, thereby simulating the working condition of the steel pipe sample 3 in a humid saline-alkali environment, so as to test the corrosion resistance of its outer wall.

[0034] The lower salt spray tube assembly 4 is used to transport salt spray into the corrosion chamber 23, while the upper salt spray tube assembly 4 is used to discharge salt spray from the corrosion chamber 23. The upper salt spray tube assembly 4 is connected to the salt spray absorption tank through a gas pipe, and the salt spray that escapes is absorbed by the solution in the absorption tank to prevent it from spreading in the operating environment.

[0035] The working principle and usage process of this utility model:

[0036] During the test, the steel pipe sample 3 is installed in the test cylinder 2. The sealed connection between the closed base 21, the main body of the cover cylinder 22 and the closed cover 24 ensures that the test cylinder 2 as a whole can form a closed test environment for synchronous testing of the inner and outer walls of the steel pipe sample 3.

[0037] During the corrosion solution test, the corrosion-resistant pump 52 extracts the high-temperature corrosion solution stored in the heating storage tank 51 and delivers it to the steel pipe sample section 3 through the infusion pipe 53. After the steel pipe sample section 3 is filled, it flows out from the outlet pipe 242 and flows back to the heating storage tank 51 through the recovery pipe 54.

[0038] During the salt spray test, the ultrasonic atomizer 62 vibrates the salt solution stored in the generator 61 into salt spray and sprays it out. Under the action of the blower 64, the spray is transported through the delivery pipe 63 and the main pipe 44 to the ring pipe 41, and finally flows evenly into the corrosion chamber 23 through the branch pipe 42, so that the outer wall of the steel pipe sample 3 is completely exposed to the salt spray environment. This simulates the working conditions of the steel pipe sample 3 in a humid and saline-alkali environment, so as to test the corrosion resistance of its outer wall.

[0039] Finally, it should be noted that the above embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A heat exchanger stainless steel tube corrosion resistance testing mechanism, characterized in that, include: A test tube (2) is mounted on a test stand (1). The test tube (2) includes a closed base (21) on which a sealed cover body (22) is inserted. The top of the cover body (22) is covered with a sealed cover (24). A steel pipe section (3) is inserted into a closed base (21) and located inside the main body of the cover (22). A corrosion cavity (23) is formed between the steel pipe section (3) and the main body of the cover (22). The salt spray tube assembly (4) is symmetrically installed on the main body of the hood (22) and is connected to the corrosion chamber (23); The corrosion solution pumping assembly (5) is used to deliver the test corrosion solution into the test cylinder (2) and to make it flow through the steel pipe sample section (3); Salt spray generator (6) is used to deliver test salt spray into the salt spray tube assembly (4) so ​​that it fills the entire corrosion chamber (23).

2. The heat exchanger stainless steel tube corrosion resistance testing mechanism according to claim 1, characterized in that: The closed base (21) has a lower slot (211) corresponding to the size of the steel pipe sample section (3), and the bottom end of the closed base (21) is machined to form a water inlet (212).

3. The heat exchanger stainless steel tube corrosion resistance testing mechanism according to claim 2, characterized in that: The enclosure (24) has two upper slots (241) that correspond to the dimensions of the steel pipe section (3) and the main body of the enclosure (22), respectively, and the top of the enclosure (24) is machined to form a water outlet (242).

4. The corrosion resistance testing mechanism for stainless steel tubes in heat exchangers according to claim 2, characterized in that: The inner wall of the bottom end of the cover body (22) is fixedly provided with a closed ring frame (221) that is engaged with the closed base (21).

5. The heat exchanger stainless steel tube corrosion resistance testing mechanism according to claim 1, characterized in that: The upper surface of the platform (1) is fixedly provided with a number of guide rods (26) arranged in a circular array. The closed cover (24) is covered with a positioning plate (25), which has a number of guide holes (251) corresponding to the positions of the guide rods (26).

6. The corrosion resistance testing mechanism for stainless steel tubes in heat exchangers according to claim 1, characterized in that: The salt spray tube assembly (4) includes a ring tube (41), with several sealed branch tubes (42) fixedly installed on its inner side. These branch tubes are sealed to the main body (22), and the branch tubes (42) are provided with sealing plugs (43) that are bonded to the outer wall of the main body (22). In addition, a main tube (44) is sealed to the ring tube (41).

7. The corrosion resistance testing mechanism for stainless steel tubes in heat exchangers according to claim 3, characterized in that: The corrosive solution pumping assembly (5) includes a heating storage tank (51) with a heater inside. A corrosion-resistant pump (52) is installed on the front side of the heating storage tank (51). Its output port is sealed to the inlet pipe (212) through a delivery pipe (53). In addition, a recovery pipe (54) is sealed to the outlet pipe (242), and its end is connected to the heating storage tank (51).

8. The corrosion resistance testing mechanism for stainless steel tubes in heat exchangers according to claim 6, characterized in that: The salt spray generator (6) includes a generator box (61) with an ultrasonic atomizer (62) at the bottom. A sealed delivery pipe (63) is provided on one side of the generator box (61), and a blower cylinder (64) facing the delivery pipe (63) is provided on the other side. The delivery pipe (63) is sealed to the main pipe (44) of the salt spray pipe group (4) located below.

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