Method for simulating dew point corrosion test

Abstract

The invention provides a method for simulating a dew point corrosion test, which comprises the following steps: distilling and atomizing a chlorine salt solution to form chlorine salt gas; respectively heating and mixing chlorine salt gas and air to form mixed gas; providing an experiment bin, configuring the experiment bin to have different temperature areas, and then placing the sample in the experiment bin in the different temperature areas; compressing the mixed gas, and introducing the compressed mixed gas into the experiment cabin; and detecting the position of the dew formed on the surface of the sample so as to determine the dew point corrosion position. According to the technical scheme provided by the invention, the corrosion rate and corrosion degree of different materials can be measured under the condition of continuous temperature difference change in a salt-containing air dew point corrosion environment in a high-pressure environment.

Description

Technical Field

[0001] This application relates to the field of corrosion testing technology, specifically to a method for simulating dew point corrosion testing. Background Technology

[0002] As a key technology driving the transformation of energy production and utilization, energy storage will undoubtedly bring opportunities for energy transition, and compressed air energy storage is at the forefront of the energy storage technology field. If we could awaken the millennia-old salt caves and generate electricity by compressing air within them, it would be a "dialogue on energy" that transcends time.

[0003] Salt caverns, the tunnels left after salt mining, are a valuable non-renewable resource. my country is rich in salt caverns, most of which are large and well-sealed, making them suitable for storing important strategic materials such as oil and natural gas, and also ideal locations for storing compressed air. However, due to low utilization rates, the vast majority are currently idle. The establishment of a salt cavern compressed air energy storage project in this area will help explore new paths for the recycling and sustainable development of salt caverns.

[0004] The large amount of salt particles and chlorides such as NaCl and MgCl in the air inside the salt cavern are highly hygroscopic and easily form a water film on the metal surface. This water film is actually an electrolyte film containing dissolved salts. The chlorine-containing electrolyte is one of the main causes of local pitting corrosion. When various gaseous components dissolve in the salt cavern, the corrosion rate can reach 0.1 mm / a, accelerating the corrosion of the pipeline until it corrodes through.

[0005] With technological advancements, existing technologies include a low-temperature dew point corrosion test method and apparatus for phosphorus in yellow phosphorus tail gas on boiler materials. This method involves immersing the material in phosphoric acid solutions of different temperatures and concentrations for a specific time to evaluate its dew point corrosion performance. However, it substitutes general liquid corrosion for dew point corrosion, neglecting the fact that dew point corrosion in this environment is essentially corrosion of the material under a thin film of phosphoric acid. There are also apparatuses that use sulfur dioxide and sulfur trioxide gases as corrosive media to simulate sulfuric acid dew point corrosion caused by the condensation of sulfur dioxide and sulfur trioxide with water vapor. However, these methods are limited in that they only study the dew point corrosion formed by pollutant gases on water vapor, and the corrosion evaluation method only assesses the material's resistance to dew point corrosion by measuring the weight change before and after the test. The testing method is simplistic and cannot simulate corrosion under chloride ion-containing dew points, nor does it conform to the corrosion characteristics of salt cavern gases with high salt content.

[0006] Existing dew point corrosion testing devices are all suitable for simulating hydrochloric acid and sulfuric acid dew point corrosion conditions under normal or low pressure environments.

[0007] The content in the background section is merely technology known to the public and does not necessarily represent existing technology in this field. Summary of the Invention

[0008] This application aims to provide a method for simulating dew point corrosion testing, which solves the problem of measuring the corrosion rate and degree of corrosion of different materials under linear temperature difference changes in a salt-containing air dew point corrosion environment under high pressure.

[0009] According to one aspect of this application, a method for simulating dew point corrosion testing is proposed, comprising the following steps: distilling and atomizing a chloride solution to form chloride gas; heating and mixing the chloride gas and air separately to form a mixed gas; providing an experimental chamber configured with different temperature zones, and placing a sample in the experimental chamber within the different temperature zones; compressing the mixed gas and introducing it into the experimental chamber; and detecting the position of dew droplets formed on the surface of the sample to determine the location of dew point corrosion.

[0010] According to some embodiments, the method for simulating dew point corrosion testing further includes collecting chloride salt solutions for distillation and atomization, as well as an absorption tank for waste gas and waste liquid formed in the experimental chamber.

[0011] According to some embodiments, heated chloride gas and air are mixed in a gas mixing tank.

[0012] According to some embodiments, the chloride gas enters the gas mixing tank through a pressure reducing valve and a heat-conducting structure.

[0013] According to some embodiments, the air passes through a pressure reducing valve and a heat-conducting structure before entering a gas mixing tank.

[0014] According to some embodiments, the gas mixing tank includes an inner cylinder and an outer cylinder, characterized in that the inner cylinder is disposed inside the outer cylinder, and an annular constant temperature liquid chamber is formed between the inner cylinder and the outer cylinder; the inner cylinder is provided with a gas mixing tank inlet pipe connected to a gas compression device, and a gas mixing tank outlet pipe connected to the experimental chamber; the outer cylinder is provided with a gas mixing tank water inlet pipe for supplying water to the constant temperature liquid chamber and a gas mixing tank water outlet pipe for discharging water from the constant temperature liquid chamber.

[0015] According to some embodiments, four gas baffles are sequentially arranged in the inner cylinder along the direction from the gas mixing tank inlet pipe to the gas mixing tank outlet pipe. Each gas baffle is provided with multiple air holes for gas to pass through. Along the direction from the gas mixing tank inlet pipe to the gas mixing tank outlet pipe, the multiple air holes are alternately distributed at the center and edge of the four gas baffles. Along the direction from the gas mixing tank inlet pipe to the gas mixing tank outlet pipe, the flow area of ​​the multiple air holes on the four gas baffles gradually decreases and the distance between two adjacent gas baffles gradually increases.

[0016] According to some embodiments, an experimental chamber is constructed by connecting and fixing multiple sequentially connected experimental cavities using a multi-level sealing structure.

[0017] According to some embodiments, the pressure in each of the experimental chambers is the same, for a high-pressure environment not exceeding 55 MPa.

[0018] According to some embodiments, the experimental chamber is equipped with temperature sensors and pressure sensors to control the temperature and pressure of the experimental chamber.

[0019] Based on the above-mentioned method for simulating dew point corrosion test, the experimental device uses a mixture of high-pressure sodium chloride gas and air injected into the experimental chamber. At the same time, the temperature of the sealed cavity inside the experimental chamber is controlled by setting the temperature of the annular constant temperature chamber with water bath or oil bath on the inner wall of each experimental chamber in a constant temperature mode in different temperature ranges. The temperature of the sealed experimental chamber is adjusted by temperature sensor, and the temperature inside the sealed cavity is cooled from high temperature to low temperature, so that the experimental temperature of each experimental chamber changes linearly, thereby achieving its experimental purpose.

[0020] To further understand the features and technical content of this application, please refer to the following detailed description and drawings of this application. However, this description and drawings are only used to illustrate this application and are not intended to limit the scope of protection of this application in any way. Attached Figure Description

[0021] The embodiments of this disclosure are described in detail below with reference to the accompanying drawings. These drawings, which form part of this disclosure, are used to provide a further understanding of the disclosure. The illustrative embodiments of this disclosure and their descriptions are used to explain the disclosure and do not constitute an undue limitation of the disclosure. In the drawings:

[0022] Figure 1-2 A schematic diagram of the process structure according to an example embodiment of this application is shown.

[0023] Figure 3 A flowchart illustrating the steps according to an example embodiment of this application is shown. Detailed Implementation

[0024] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that this application will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar parts, and therefore repeated descriptions of them will be omitted.

[0025] The described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a full understanding of embodiments of this disclosure. However, those skilled in the art will recognize that the technical solutions of this disclosure can be practiced without one or more of these specific details, or other methods, components, materials, devices, or the like. In these cases, well-known structures, methods, devices, implementations, materials, or operations will not be shown or described in detail.

[0026] The flowcharts shown in the accompanying drawings are merely illustrative and do not necessarily include all content and operations / steps, nor do they necessarily have to be performed in the described order. For example, some operations / steps can be broken down, while others can be combined or partially combined; therefore, the actual execution order may change depending on the specific circumstances.

[0027] The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or apparatuses.

[0028] Salt cavern compressed air energy storage projects offer advantages such as large capacity, long lifespan, low cost, fast response, flexible operation, high efficiency, low pollution, and small footprint. They can achieve peak shaving and valley filling, as well as frequency regulation and voltage stabilization in power supply. Salt cavern compressed air energy storage technology utilizes salt caverns to compress air, achieving energy storage and conversion. During storage, a multi-stage compressor compresses air to a high-pressure state and stores it in an underground salt cavern, completing the conversion of electrical energy into air pressure potential energy. During release, the compressed air is released from the underground salt cavern, driving a turbine expander to generate electricity, completing the conversion of air pressure potential energy into electrical energy.

[0029] The following will describe in detail a method for simulating dew point corrosion testing according to an embodiment of this application, with reference to the accompanying drawings.

[0030] Figure 1-2 A schematic diagram of the process structure according to an example embodiment of this application is shown. Figure 3 A flowchart illustrating the steps according to an example embodiment of this application is shown.

[0031] like Figure 3As shown in the example embodiment of this application, this disclosure provides a method for simulating dew point corrosion testing, comprising the following steps: distilling and atomizing a chloride solution to form chloride gas; heating and mixing the chloride gas and air separately to form a mixed gas; providing an experimental chamber, configuring the experimental chamber with different temperature zones, and placing the sample in the experimental chamber and placing it in different temperature zones; compressing the mixed gas and introducing it into the experimental chamber; detecting the position of the dew droplets formed on the surface of the sample to determine the location of dew point corrosion.

[0032] like Figure 1-2 As shown in the embodiment of this application, a dew point corrosion test device for simulating the formation of salt-containing gas includes a gas mixing tank 7, a gas compression device 4, an experimental chamber 8, a temperature sensor 73, and a pressure sensor 71.

[0033] Gas mixing tank 7 is used to introduce chloride gas and air into the gas mixing tank for uniform mixing. Gas compression device 4 is located between gas mixing tank 7 and experimental chamber, used to compress the mixed gas into the experimental chamber. Experimental chamber 8 includes multiple experimental chambers connected in sequence. Each experimental chamber has an independent annular constant temperature chamber 87 on its side wall for water bath or oil bath. Adjacent experimental chambers are sealed and fixed together by plastic heat insulation rings 86. Experimental chamber 8 is connected to gas compression device 4 and contains a sealed high-pressure cavity for holding the sample, used to simulate salt dew point corrosion under high pressure. Temperature sensor 73 is used to linearly adjust the temperature of the multiple sequentially connected experimental chambers.

[0034] According to an embodiment of this application, the surface of the temperature sensor 73 is coated with a thermally conductive and corrosion-resistant coating, and it is connected and fixed to multiple sequentially connected experimental chambers using a multi-level sealing structure.

[0035] According to an embodiment of this application, two adjacent experimental chambers are fixedly connected by a sleeve seal.

[0036] According to an embodiment of this application, a pressure sensor is used to linearly regulate the pressure of multiple sequentially connected experimental chambers. This ensures that the pressure in each experimental chamber is the same, providing a high-pressure environment not exceeding 55 MPa.

[0037] According to the embodiments of this application, each experimental chamber can simulate dew point corrosion of gases in a saline environment with a humidity of 10% to 95% RH.

[0038] Specifically, such as Figure 1As shown, the experimental chamber 8 adopts a four-stage design, consisting of a first-stage experimental chamber 81, a second-stage experimental chamber 82, a third-stage experimental chamber 82, and a fourth-stage experimental chamber 82 connected in series. Adjacent experimental chambers are fixed by a sleeve-sealed connection, or they can be connected by a joint with a wedge-shaped thread. Like the gas mixing tank 7, the experimental chamber 8 uses an external method of introducing a constant-temperature liquid to insulate the interior of each experimental chamber. Since each stage of the experimental chamber is independently set, a constant-temperature liquid of different temperatures can be introduced into the annular constant-temperature chamber 87 of each experimental chamber to simulate the temperature drop process under actual working conditions. Simultaneously, because the inner diameter of each stage of the experimental chamber is consistent, large samples of considerable length can be placed inside. Of course, this application does not limit the number of experimental chambers; the design can be adjusted according to actual experimental needs. The gas mixing tank 7 also has an annular constant-temperature chamber 71 on its outer side, which can be introduced with constant-temperature liquids of different temperatures to simulate the temperature drop process under actual working conditions.

[0039] To ensure that the temperatures of the solutions introduced into each experimental chamber do not affect each other, high-temperature resistant plastic heat insulation rings 86 (such as heat insulation connecting rings made of polytetrafluoroethylene plastic) are used to connect two adjacent experimental chambers, so that the two adjacent experimental chambers do not directly contact each other and thus isolate the temperature interference between them.

[0040] Specifically, the first-level experimental chamber 81 and the second-level experimental chamber 82 are connected and insulated from each other by a first-level heat-insulating connecting ring; the second-level experimental chamber 82 and the third-level experimental chamber 82 are connected and insulated from each other by a second-level heat-insulating connecting ring; and the third-level experimental chamber 82 and the fourth-level experimental chamber 82 are connected and insulated from each other by a third-level heat-insulating connecting ring.

[0041] The connection points of two adjacent experimental cavities are wedge-shaped inner and outer conical surfaces, respectively. The two adjacent experimental cavities are sealed and fixed by a conical polytetrafluoroethylene (PTFE) heat insulation ring. The inner and outer surfaces of the PTFE heat insulation ring can be provided with internal and external threads that match the two adjacent experimental cavities, respectively.

[0042] The constant temperature liquid enters the annular constant temperature chamber 87 of each experimental chamber from the experimental chamber inlet pipe at the bottom of each experimental chamber, and then flows out from the experimental chamber outlet pipe at the top of the experimental chamber, so as to keep and control the temperature inside the experimental chamber.

[0043] According to an embodiment of this application, the dew point corrosion test apparatus simulating the formation of salt-containing gases further includes a waste liquid and waste gas collection tank 9 for collecting waste liquid and waste gas discharged from the raw material tank 1, distillation device 12, and experimental chamber 8. A cooler 91 is provided before the waste gas enters the waste gas collection tank 9.

[0044] Waste liquid and waste gas collection tank 9 is used to collect the experimental waste discharged from the experimental chamber 8 and the first part, such as Figure 1As shown, the gas and liquid discharged after passing through the fourth-stage experimental chamber 82 are waste gas and waste liquid, which are directly discharged into the waste liquid and waste gas absorption tank containing 10% alkaline solution absorption liquid.

[0045] According to an embodiment of this application, the dew point corrosion test apparatus simulating the formation of salt-containing gases further includes a raw material tank 1 and a distillation apparatus 12. The raw material tank 1 contains an aqueous sodium chloride solution and can supply the aqueous sodium chloride solution to the distillation flask of the distillation apparatus 12 via a delivery pipeline. The distillation flask of the distillation apparatus 12 is also connected to a drain pipeline for discharging waste liquid from the distillation flask and a first exhaust pipeline for discharging sodium chloride gas. The first exhaust pipeline is connected to a gas mixing tank 7 and is equipped with a raw material gas pump 3, a raw material gas pressure reducing valve, and a raw material gas heat transfer oil tank 6. The drain pipeline is equipped with a raw material waste liquid pump, which can discharge the waste liquid in the distillation flask while simultaneously drawing the aqueous sodium chloride solution from the raw material tank 1 into the distillation flask, thus maintaining a stable sodium chloride concentration in the aqueous sodium chloride solution of the distillation flask. The flow rate of the solution in the raw material tank 1 is controlled by a pneumatic ball valve 13 and a one-way valve 14. A shut-off valve 15 is provided on the gas mixing tank 7, and discharge valves 85 are provided on each of the multi-stage experimental chambers.

[0046] Distillation apparatus 12 employs an oil bath or electric furnace for heating and distillation, with the temperature controlled between 60℃ and 200℃. The separated gaseous components are mainly a mixture of NaCl and H2O vapors, with the remaining liquid at the bottom being waste liquid. Since the vapor composition of liquid sodium chloride solutions of different concentrations varies at the same temperature, a waste liquid pump is used to continuously pump the solution from raw material tank 1 to distillation apparatus 12 at a low speed to replace it with fresh solution, thus maintaining the stability of the solution composition in distillation apparatus 12. Specifically, a waste liquid pump is installed on the drain line, which can simultaneously discharge the waste liquid from the distillation flask and draw the sodium chloride aqueous solution from raw material tank 1 into the distillation flask, maintaining a stable sodium chloride concentration in the solution. The distilled gas, kept at a constant temperature, is pumped by raw material gas pump 3 and depressurized by a raw material gas pressure reducing valve to approximately 0.1 MPa before being sent to the raw material gas heat transfer oil tank 6 for temperature control. Its temperature is slightly higher than the dew point temperature to ensure it remains gaseous before entering the gas mixing tank 7.

[0047] According to an embodiment of this application, the dew point corrosion test apparatus simulating the formation of salt-containing gases further includes a gas cylinder 2 and a second exhaust pipeline. The gas cylinder 2 is connected to a gas mixing tank 7 via the second exhaust pipeline. The second exhaust pipeline is equipped with a two-stage gas pressure reducing valve and a mixed gas heat-conducting structure, which can be a heat-conducting oil tank 6. Pressure reducing valves 11 are connected to the raw material tank 1 and the gas cylinder 2 respectively. A solenoid valve is also installed on the gas cylinder 2 to control the gas flow rate.

[0048] The second exhaust pipeline is equipped with a two-stage gas pressure reducing valve. After the gas is reduced to 0.1 MPa by the two-stage gas pressure reducing valve, it enters the gas hot oil tank and is heated to the same temperature as the raw material gas in the first part (i.e. the mixed vapor of NaCl and H2O mentioned above), and then sent to the gas mixing tank 7.

[0049] According to an embodiment of this application, the gas mixing tank 7 includes an inner cylinder and an outer cylinder. The inner cylinder is disposed inside the outer cylinder, and an annular constant temperature liquid cavity is formed between the inner cylinder and the outer cylinder. The inner cylinder is provided with a gas mixing tank 7 inlet pipe connected to the gas compression device 4, and a gas mixing tank 7 outlet pipe connected to the experimental chamber 8. The outer cylinder is provided with a gas mixing tank 7 water inlet pipe for supplying water to the constant temperature liquid cavity and a gas mixing tank 7 water outlet pipe for discharging water from the constant temperature liquid cavity.

[0050] According to an embodiment of this application, in order to uniformly mix different types of gases in the gas mixing tank 7, four gas baffles are sequentially arranged along the direction from the gas inlet pipe to the gas outlet pipe of the gas mixing tank 7. Each gas baffle has multiple air holes for gas passage, and these multiple air holes are alternately distributed at the center and edge of the four gas baffles along the direction from the gas inlet pipe to the gas outlet pipe of the gas mixing tank 7. A pressure sensor 71 is installed on the gas mixing tank 7 to monitor its internal pressure for experimental purposes.

[0051] Specifically, such as Figure 2 As shown, the gas mixing tank 7 adopts a double-layer structure. A constant-temperature liquid (water or oil) is introduced into the outside to insulate and control the internal temperature of the gas mixing tank 7. The temperature is controlled slightly above the dew point temperature to prevent gas liquefaction within the gas mixing tank 7. The constant-temperature liquid enters through the water inlet pipe at the bottom of the gas mixing tank 7 and exits through the water outlet pipe at the top. The interior of the gas mixing tank 7 uses four-stage gas baffles to create flow deflections and ensure uniform mixing of the introduced gas. Each stage of the gas baffle consists of a gas baffle partition and gas baffle vents. The first-stage gas baffle vents are located at 45°, 135°, 225°, and 315° around the center of the first-stage gas baffle partition. A solid circular thick plate with the same center as the gas mixing tank 7 is used to create openings in these four directions. The original dimensions of the 0°, 90°, 180°, and 270° directions are retained for easy connection to the interior of the gas mixing tank 7.

[0052] The mixed gas enters through the inlet pipe of the gas mixing tank 7 and exits through the vents of the first-stage gas baffle to the second-stage gas baffle. The vents of the second-stage gas baffle are located in the center of the second-stage gas baffle, facilitating the flow of the mixed gas after entry through the baffle. Simultaneously, the vents of the second-stage baffle consist of more than a dozen small circular holes, which facilitates the breaking up and uniform mixing of the incoming mixed gas. After passing through the vents of the second-stage baffle, the mixed gas proceeds to the third-stage gas baffle. The third-stage gas baffle has the same shape as the first-stage gas baffle, but it is rotated 45° counterclockwise when connected to the interior of the gas mixing tank 7. The positions of the third-stage baffle baffle and the vents of the third-stage gas baffle are interchanged with those of the first-stage gas baffle, resulting in more uniform mixing of the passing gas. The fourth-stage gas baffle is set around the perimeter. After the mixed gas is finally mixed, it is discharged from the gas hole of the fourth-stage gas baffle in the middle position and is already a uniformly mixed gas. It is then injected into the first-stage experimental chamber 81 of the experimental chamber 8 through the inlet and outlet pipes of the gas mixing tank 7.

[0053] In addition, to further facilitate uniform mixing of gases in the gas mixing tank 7, the flow area of ​​the multiple gas holes on the four gas baffles gradually decreases and the distance between two adjacent gas baffles gradually increases along the direction from the gas inlet pipe to the gas outlet pipe of the gas mixing tank 7, so as to facilitate uniform mixing of gases.

[0054] Finally, it should be noted that the above descriptions are merely exemplary embodiments of this disclosure and are not intended to limit this disclosure. Although this disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the protection scope of this disclosure.

Claims

1. A method for simulating dew point corrosion testing, characterized in that, Includes the following steps: The chloride salt solution is distilled and atomized to form chloride salt gas; Chloride gas and air are heated separately and then mixed to form a mixed gas. An experimental chamber is provided, which is configured to have different temperature zones. The sample is then placed in the experimental chamber and placed in different temperature zones. The mixed gas is compressed and introduced into the experimental chamber; The location of dew droplets formed on the surface of the sample is detected to determine the location of dew point corrosion.

2. The method for simulating dew point corrosion testing according to claim 1, characterized in that, It also includes a waste gas and waste liquid absorption tank for collecting chloride salt solutions for distillation and atomization, as well as the experimental chamber.

3. The method for simulating dew point corrosion testing according to claim 1, characterized in that, The heated chloride gas and the air are mixed in a gas mixing tank.

4. The method for simulating dew point corrosion testing according to claim 3, characterized in that, The chloride gas enters the gas mixing tank through a pressure reducing valve and a heat-conducting structure.

5. The method for simulating dew point corrosion testing according to claim 3, characterized in that, The air enters the gas mixing tank through a pressure reducing valve and a heat-conducting structure.

6. The method for simulating dew point corrosion testing according to claim 3, wherein the gas mixing tank comprises an inner cylinder and an outer cylinder, characterized in that, The inner cylinder is disposed inside the outer cylinder, and an annular constant temperature liquid chamber is formed between the inner cylinder and the outer cylinder. The inner cylinder is provided with a gas mixing tank inlet pipe connected to a gas compression device and a gas mixing tank outlet pipe connected to the experimental chamber. The outer cylinder is provided with a gas mixing tank water inlet pipe for supplying water to the constant temperature liquid chamber and a gas mixing tank water outlet pipe for discharging water from the constant temperature liquid chamber.

7. The method for simulating dew point corrosion testing according to claim 6, characterized in that, Four gas baffles are arranged sequentially in the inner cylinder along the direction from the gas inlet pipe to the gas outlet pipe of the gas mixing tank. Each gas baffle is provided with multiple air holes for gas to pass through. Along the direction from the gas inlet pipe to the gas outlet pipe of the gas mixing tank, the multiple air holes are alternately distributed at the center and the edge of the four gas baffles. Along the direction from the gas inlet pipe to the gas outlet pipe of the gas mixing tank, the flow area of ​​the multiple air holes on the four gas baffles gradually decreases and the distance between two adjacent gas baffles gradually increases.

8. The method for simulating dew point corrosion testing according to claim 1, characterized in that, The experimental chamber is constructed by connecting and fixing multiple sequentially connected experimental cavities using a multi-stage sealing structure.

9. The method for simulating dew point corrosion testing according to claim 8, characterized in that, The pressure inside each of the experimental chambers is the same, designed for a high-pressure environment not exceeding 55 MPa.

10. The method for simulating dew point corrosion testing according to claim 1, characterized in that, The experimental chamber is equipped with temperature and pressure sensors to control the temperature and pressure of the experimental chamber.

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