Dew point corrosion test device for simulating formation of salt-containing gas

Abstract

The invention provides a dew point corrosion test device for simulating formation of salt-containing gas, comprising: a gas mixing tank for uniformly mixing gas; the gas compression device is connected to the gas mixing tank and is used for compressing the mixed gas; the experiment bin comprises a plurality of experiment cavities which are sequentially connected, the side wall of each experiment cavity is provided with an independent annular constant-temperature cavity used for water bath or oil bath, every two adjacent experiment cavities are fixedly connected in a sealed mode through a plastic heat insulation ring, and the experiment bin is connected to the gas compression device; a sealed high-pressure cavity used for containing a sample is formed in the high-pressure chamber and is used for simulating salt-containing dew point corrosion in a high-pressure environment; and the temperature sensor is used for linearly adjusting the temperature of the experiment cavities which are connected in sequence. 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] The application relates to the technical field of corrosion tests, in particular to a dew point corrosion test device for simulating the formation of salt-containing gas. BACKGROUND

[0002] As one of the important technologies to promote the change of energy production and utilization mode, energy storage will undoubtedly bring opportunities for energy transformation, and compressed air energy storage is the "frontier of frontier" in the field of energy storage technology. If the millennium salt cave is awakened and the compressed air is used to generate electricity, it can be called a "energy dialogue" through time and space.

[0003] Salt cave, i.e. the mine left after salt mining, is a valuable non-renewable resource. China is rich in salt cave resources, most of which are large in size and good in sealing, suitable for storing important strategic materials such as oil and natural gas, and is also an ideal place for storing high-pressure air. However, due to low utilization rate, most of them are currently idle. The compressed air energy storage project in the salt cave will help explore new paths for the recycling and sustainable development of the salt cave.

[0004] With the development of technology, the existing technology has a dew point corrosion test device, which is suitable for salt acid and sulfuric acid dew point corrosion working condition simulation under normal pressure or low pressure environment.

[0005] The content of the background technology part is only the technology known by the discloser, and does not necessarily represent the prior art in the field. SUMMARY

[0006] The application aims to provide a dew point corrosion test device for simulating the formation of salt-containing gas, which solves the problem of measuring the corrosion rate and corrosion degree of different materials under the condition of linear temperature difference change of salt-containing air dew point corrosion environment under high pressure environment.

[0007] According to one aspect of the application, a dew point corrosion test device for simulating the formation of salt-containing gas is provided, which comprises: a gas mixing tank for uniformly mixing gas; a gas compression device connected to the gas mixing tank for compressing the mixed gas; an experimental bin comprising a plurality of experimental chambers connected in sequence, each experimental chamber having an independent annular constant temperature chamber for water bath or oil bath on the side wall, and two adjacent experimental chambers are sealingly connected and fixed by a plastic heat insulation ring, the experimental bin is connected to the gas compression device and contains a sealed high-pressure cavity for loading samples, for simulating salt-containing dew point corrosion under high pressure environment; a temperature sensor for linearly adjusting the temperature of the plurality of experimental chambers connected in sequence.

[0008] According to some embodiments, the surface of the temperature sensor is coated with a heat-conducting and corrosion-resistant coating, and is connected and fixed to the plurality of experimental chambers in a multi-stage sealing structure.

[0009] According to some embodiments, two adjacent experimental chambers are connected by a sealing connection.

[0010] According to some embodiments, the pressure in each experimental chamber is the same, and is used for a high-pressure environment of no more than 55 MPa.

[0011] According to some embodiments, the gas mixing tank comprises an inner cylinder and an outer cylinder, the inner cylinder is arranged in 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 gas inlet pipe connected with a gas compression device, and is provided with a gas mixing tank gas outlet pipe connected with the experimental chamber, and the outer cylinder is provided with a gas mixing tank water inlet pipe for supplying water to the constant-temperature liquid cavity and a gas mixing tank water outlet pipe for discharging water in the constant-temperature liquid cavity.

[0012] According to some embodiments, four gas baffles are arranged in the inner cylinder in sequence along the direction from the gas mixing tank gas inlet pipe to the gas mixing tank gas outlet pipe, each gas baffle is provided with a plurality of gas holes for gas passing, and the plurality of gas holes are alternately distributed at the center and the edge of the four gas baffles along the direction from the gas mixing tank gas inlet pipe to the gas mixing tank gas outlet pipe.

[0013] According to some embodiments, along the direction from the gas mixing tank gas inlet pipe to the gas mixing tank gas outlet pipe, the flow area of the plurality of gas holes on the four gas baffles gradually decreases and the distance between adjacent two gas baffles gradually increases.

[0014] According to some embodiments, the dew point corrosion test device for simulating the formation of salt-containing gas further comprises a raw material tank and a distillation device, the raw material tank contains a sodium chloride aqueous solution, the raw material tank can supply the sodium chloride aqueous solution to a distillation flask of the distillation device through a liquid supply pipeline, the distillation flask of the distillation device is further connected with a liquid discharge pipeline for discharging waste liquid in the distillation flask and a first gas discharge pipeline for discharging sodium chloride gas, the first gas discharge pipeline is connected with the gas mixing tank, the first gas discharge pipeline is provided with a raw material gas pump, a raw material gas pressure reducing valve and a raw material gas heat conducting oil tank, the liquid discharge pipeline is provided with a raw material waste liquid pump, the raw material waste liquid pump can suck the sodium chloride aqueous solution in the raw material tank into the distillation flask while discharging the waste liquid in the distillation flask, and keep the concentration of sodium chloride in the sodium chloride aqueous solution in the distillation flask stable.

[0015] According to some embodiments, the dew point corrosion test device for simulating the formation of salt-containing gas further comprises a gas bottle and a second gas discharge pipeline, the gas bottle is connected with the gas mixing tank through the second gas discharge pipeline, and the second gas discharge pipeline is provided with a secondary gas pressure reducing valve and a mixed gas heat conducting oil tank.

[0016] According to some embodiments, the dew point corrosion test device for simulating the formation of salt-containing gas further comprises a waste liquid and waste gas collection tank for collecting the waste liquid and waste gas discharged from the raw material tank, the distillation device and the experimental chamber.

[0017] Based on the dew point corrosion test device for simulating the formation of salt-containing gas, the experimental device injects a mixture of high-pressure sodium chloride gas and air into the experimental chamber, controls the temperature of the sealed cavity in the experimental chamber by controlling the temperature of the annular constant-temperature cavity of the water bath or oil bath on the inner wall of each experimental chamber in different temperature zones, adjusts the temperature of the sealed experimental chamber through a temperature sensor, and cools down the temperature in the sealed cavity from high temperature to low temperature, so that the experimental temperature of each experimental chamber changes linearly, thereby achieving the experimental purpose.

[0018] For a further understanding of the features and technical contents of the present application, please refer to the following detailed description and drawings of the present application. However, the description and drawings are only used to illustrate the present application, and do not limit the protection scope of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0019] The embodiments of the present disclosure will be described in detail below with reference to the drawings. Here, the drawings constituting a part of the present disclosure are used to provide a further understanding of the present disclosure. The illustrative embodiments of the present disclosure and their descriptions are used to explain the present disclosure, and do not constitute an improper limitation on the present disclosure. In the drawings:

[0020] Fig. 1-2 A flow structure schematic diagram according to an example embodiment of the present application is shown. DETAILED DESCRIPTION

[0021] Example embodiments now will be described more fully hereinafter with reference to the accompanying drawings. Example embodiments may, however, be implemented in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. Like reference numerals refer to like elements throughout the several views of the drawings, and description of the same will be omitted.

[0022] The described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the technology can be practiced without one or more of the specific details, or with other methods, components, materials, and so forth. In some instances, detailed descriptions of well-known structures, methods, devices, implementations, materials, and so forth are omitted to avoid obscuring the disclosure.

[0023] The flow chart shown in the drawing is only an exemplary illustration, and is not necessarily to include all the contents and operations / steps, nor is it necessarily to be executed in the order as described. For example, some operations / steps can be further decomposed, and some operations / steps can be combined or partially combined, so the actual execution order can be changed according to the actual situation.

[0024] The terms "first", "second", and the like in the specification and claims of the present application and in the above-described drawings are used to distinguish different objects, and are not used to describe a specific order. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but can optionally further include steps or units not listed, or can optionally further include other steps or units inherent to the process, method, product, or device.

[0025] The salt cavern compressed air energy storage project has large capacity, long service life, low cost, fast response, high operation, high efficiency, less pollution, and small occupation. It can realize "peak load shifting" and "frequency modulation and voltage stabilization" of power supply. The salt cavern compressed air energy storage technology compresses air by means of salt cavern to realize energy storage and conversion. During energy storage, the multi-stage compressor compresses air to a high pressure state and stores it in the underground salt cavern, completing the conversion of electric energy to air pressure potential energy; during energy release, the compressed air is released from the underground salt cavern to drive the turbine expander to generate electricity, completing the conversion of air pressure potential energy to electric energy.

[0026] Hereinafter, a simulation device for dew point corrosion test of salt-containing gas according to an embodiment of the present application will be described in detail with reference to the accompanying drawings.

[0027] Fig. 1-2 A flow structure schematic diagram according to an example embodiment of the present application is shown.

[0028] As shown in Fig. 1-2 According to an example embodiment of the present application, the simulation device for dew point corrosion test of salt-containing gas, includes a gas mixing tank 7, a gas compression device 4, an experimental bin 8, and a temperature sensor 73.

[0029] The gas mixing tank 7 is used for uniformly mixing gas. The gas compression device 4 is connected to the gas mixing tank 7 and is used for compressing the mixed gas. The experimental bin 8 includes a plurality of experimental cavities connected in sequence, each experimental cavity has an independent annular constant temperature cavity 87 for water bath or oil bath on the side wall, and two adjacent experimental cavities are sealingly connected and fixed by a plastic heat insulation ring 86. The experimental bin 8 is connected to the gas compression device 4 and contains a sealed high-pressure cavity for loading a sample, which is used for simulating salt-containing dew point corrosion in a high-pressure environment. The temperature sensor 73 is used for linearly adjusting the temperature of the plurality of experimental cavities connected in sequence.

[0030] 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.

[0031] According to an embodiment of this application, two adjacent experimental chambers are fixedly connected by a sleeve seal.

[0032] According to the embodiments of this application, the pressure in each experimental chamber is the same, which is used for a high-pressure environment of no more than 55 MPa.

[0033] 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.

[0034] Specifically, such as Fig. 1 As 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] The constant temperature liquid enters the annular constant temperature cavity 87 of each experimental cavity from the experimental cavity water inlet pipe at the lower part of each experimental cavity, and then flows out from the experimental cavity water outlet pipe at the upper part of the experimental cavity, so as to keep and control the temperature of the inside of the experimental cavity.

[0039] According to the embodiment of the present application, the dew point corrosion test device for simulating the formation of salt-containing gas further comprises a waste liquid and gas collection tank 9 for collecting the waste liquid and gas discharged from the raw material tank 1, the distillation device 12 and the experimental cavity 8. A cooler 91 is arranged before the waste liquid and gas collection tank 9.

[0040] The waste liquid and gas collection tank 9 is used for collecting the experimental waste discharged from the experimental cavity 8 and the first part, as shown in the figure, the gas and liquid discharged after the fourth experimental cavity 82 are waste gas and waste liquid, which are directly discharged into the waste liquid and gas absorption tank containing 10% alkaline solution absorption liquid. Fig. 1

[0041] According to the embodiment of the present application, the dew point corrosion test device for simulating the formation of salt-containing gas further comprises a raw material tank 1 containing sodium chloride aqueous solution and a distillation device 12, the raw material tank 1 can supply sodium chloride aqueous solution to the distillation flask of the distillation device 12 through the liquid supply pipeline, the distillation flask of the distillation device 12 is further connected with a liquid discharge pipeline for discharging waste liquid in the distillation flask and a first gas discharge pipeline for discharging sodium chloride gas, the first gas discharge pipeline is connected with the gas mixing tank 7, the first gas discharge pipeline is provided with a raw material gas pump 3, a raw material gas pressure reducing valve and a raw material gas heat conducting oil tank 6, the liquid discharge pipeline is provided with a raw material waste liquid pump, the raw material waste liquid pump can suck the sodium chloride aqueous solution in the raw material tank 1 into the distillation flask while discharging the waste liquid in the distillation flask, and keep the concentration of sodium chloride in the sodium chloride aqueous solution in the distillation flask stable. The flow of the solution in the raw material tank 1 is controlled through the pneumatic ball valve 13 and the one-way valve 14. The gas mixing tank 7 is provided with a stop valve 15, and the multi-stage experimental cavity is provided with a discharge valve 85.

[0042] ​The distillation device 12 is heated by oil bath or electric heating furnace for distillation, and the temperature is controlled at 60-200℃. The separated gas phase component is mainly mixed vapor of NaCl and H2O, and the bottom remains waste liquid. Since the vapor components of liquid sodium chloride solution with different concentrations are different at the same temperature, in order to ensure the constant concentration of the raw material, the solution in the raw material tank 1 is continuously pumped to the distillation device 12 at low speed by the raw material waste liquid pump to replace the fresh solution, so as to keep the solution component in the distillation device 12 stable. That is, the raw material waste liquid pump is arranged on the liquid discharge pipeline, and the raw material waste liquid pump can suck the sodium chloride aqueous solution in the raw material tank 1 into the distillation bottle while discharging the waste liquid in the distillation bottle, and keep the concentration of sodium chloride in the sodium chloride aqueous solution in the distillation bottle stable. The distilled gas is kept constant temperature, is delivered by the raw material gas pump 3, is decompressed by the raw material gas decompression valve, is given to about 0.1Mpa, is sent into the raw material gas heat conducting oil tank 6 for temperature control, the temperature is slightly higher than the dew point temperature to ensure that it is in gas state, and then enters the gas mixing tank 7.

[0043] According to the embodiment of the present application, the dew point corrosion test device for simulating the formation of salt-containing gas further comprises a gas bottle 2 and a second exhaust pipeline, the gas bottle 2 is connected with the gas mixing tank 7 through the second exhaust pipeline, and a two-stage gas decompression valve and a mixed gas heat conducting oil tank 6 are arranged on the second exhaust pipeline. The raw material tank 1 and the gas bottle 2 are respectively connected with a decompression valve 11. An electromagnetic valve is further arranged on the gas bottle 2, which is used for controlling the gas passing amount.

[0044] The second exhaust pipeline is provided with a two-stage gas decompression valve, and the gas is decompressed to 0.1Mpa by the two-stage gas decompression valve and then enters the gas heat oil tank to be heated to the same temperature as the first part of the raw material gas (i.e. the mixed vapor of NaCl and H2O), and then is sent into the gas mixing tank 7.

[0045] According to the embodiment of the present application, the gas mixing tank 7 comprises an inner cylinder and an outer cylinder, the inner cylinder is arranged in the outer cylinder, 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 gas inlet pipe connected with the gas compression device 4, and is provided with a gas mixing tank 7 gas outlet pipe connected with the experimental bin 8, and the outer cylinder is provided with a gas mixing tank 7 water inlet pipe for supplying water into the constant temperature liquid cavity and a gas mixing tank 7 water outlet pipe for discharging water in the constant temperature liquid cavity.

[0046] According to the embodiment of the present application, in order to make different kinds of gas uniformly mixed in the gas mixing tank 7, four gas baffles are arranged in the inner cylinder in sequence along the direction from the gas mixing tank 7 gas inlet pipe to the gas mixing tank 7 gas outlet pipe, and a plurality of gas holes for gas passing are arranged on each gas baffle, and the plurality of gas holes are alternately distributed at the center and the edge of the four gas baffles along the direction from the gas mixing tank 7 gas inlet pipe to the gas mixing tank 7 gas outlet pipe. A pressure measurer 71 is arranged on the gas mixing tank 7, which is used for monitoring the pressure in the inner cylinder and is used for experiment.

[0047] Specifically, as shown in Fig. 2 The gas mixing tank 7 adopts a double-layer structure, and a constant liquid (water or oil) is introduced into the outside to play a role of heat preservation and temperature control for the inside of the gas mixing tank 7. The temperature control can be slightly higher than the dew point temperature to prevent the gas from liquefying in the gas mixing tank 7. The constant temperature liquid enters from the lower gas mixing tank 7 water inlet pipe and is discharged from the upper gas mixing tank 7 water outlet pipe. The inside of the gas mixing tank 7 adopts four-stage gas baffles to generate a baffle for the mixed gas introduced to uniformly mix the mixed gas. Each stage of the gas baffles is divided into a gas baffle partition and a gas baffle hole. The first-stage gas baffle hole of the first-stage gas baffle is arranged at 45°, 135°, 225° and 315° directions with the center of the first-stage gas baffle partition as the center, and a solid circular thick plate with the same center as the gas mixing tank 7 is used to open holes in the above four directions, and the 0°, 90°, 180° and 270° directions are reserved with the original size to facilitate the connection with the inside of the gas mixing tank 7.

[0048] The mixed gas enters from the gas mixing tank 7 inlet pipe and is discharged from the first-stage gas baffle hole to the second-stage gas baffle. The second-stage baffle hole of the second-stage gas baffle is arranged in the center of the second-stage gas baffle to facilitate the baffle of the mixed gas after entering. At the same time, the second-stage baffle hole is a dozen circular small holes to facilitate the breaking and uniform mixing of the mixed gas entering. The mixed gas passes through the second-stage baffle hole and reaches the third-stage gas baffle. The third-stage gas baffle and the first-stage gas baffle are the same in shape, but are rotated counterclockwise by 45° when connected with the inside of the gas mixing tank 7. The third-stage baffle partition and the third-stage gas baffle hole of the third-stage gas baffle and the first-stage gas baffle are exchanged in position to make the mixed gas more uniform. The fourth-stage gas baffle partition of the fourth-stage gas baffle is arranged around, and the mixed gas is mixed uniformly and discharged from the fourth-stage baffle hole in the middle position. The mixed gas is injected into the first-stage experimental cavity 81 of the experimental tank 8 through the gas mixing tank 7 inlet pipe and outlet pipe.

[0049] In addition, in order to further facilitate the uniform mixing of the gas in the gas mixing tank 7, the flow area of the plurality of holes on the four gas baffles gradually decreases in the direction from the gas mixing tank 7 inlet pipe to the gas mixing tank 7 outlet pipe, and the distance between adjacent two gas baffles gradually increases, so as to facilitate the uniform mixing of the gas.

[0050] Finally, it should be noted that the above only describes the example embodiments of the present disclosure and is not intended to limit the present disclosure. Although the present disclosure is described in detail with reference to the foregoing embodiments, those skilled in the art can modify the technical solutions described in the foregoing embodiments or make equivalent replacements to some technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A dew point corrosion test apparatus simulating the formation of salt-containing gases, characterized in that, include: Gas mixing tank, used for uniformly mixing gases; A gas compression device, connected to the gas mixing tank, is used to compress the mixed gas; The experimental chamber includes multiple experimental chambers connected in sequence. Each experimental chamber has an independent annular constant temperature chamber on its side wall for water bath or oil bath. Adjacent experimental chambers are sealed and fixed by plastic heat insulation rings. The experimental chamber is connected to the gas compression device and contains a sealed high-pressure cavity for holding the sample, which is used to simulate salt dew point corrosion under high pressure. Temperature sensors are used to linearly regulate the temperature of multiple experimental chambers connected in sequence.

2. The dew point corrosion test apparatus for simulating the formation of salt-containing gases according to claim 1, characterized in that, The surface of the temperature sensor 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.

3. The dew point corrosion test apparatus for simulating the formation of salt-containing gases according to claim 1, characterized in that, The two adjacent experimental chambers are fixed together by a sleeve-sealed connection.

4. The dew point corrosion test apparatus for simulating the formation of salt-containing gases according to claim 1, characterized in that, The pressure inside each of the experimental chambers is the same, designed for a high-pressure environment not exceeding 55 MPa.

5. The dew point corrosion test apparatus for simulating the formation of salt-containing gases according to claim 1, characterized in that, The gas mixing tank includes: The system comprises an inner cylinder and an outer cylinder, with the inner cylinder disposed inside the outer cylinder. 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.

6. The dew point corrosion test apparatus for simulating the formation of salt-containing gases according to claim 5, 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.

7. The dew point corrosion test apparatus for simulating the formation of salt-containing gases according to claim 1, characterized in that, Also includes: The raw material tank contains an aqueous solution of sodium chloride.

8. The dew point corrosion test apparatus for simulating the formation of salt-containing gases according to claim 7, characterized in that, Also includes: The distillation apparatus supplies the sodium chloride aqueous solution to the distillation flask via a feed line from a raw material tank. The distillation flask is also connected to a drain line for discharging waste liquid from the flask and a first exhaust line for discharging sodium chloride gas. The first exhaust line is connected to a gas mixing tank and is equipped with a raw material gas pump, a raw material gas pressure reducing valve, and a raw material gas heat transfer oil tank. The drain line is equipped with a raw material waste liquid pump, which can simultaneously discharge the waste liquid from the distillation flask and draw the sodium chloride aqueous solution from the raw material tank into the distillation flask, thus maintaining a stable sodium chloride concentration in the sodium chloride aqueous solution of the distillation flask.

9. The dew point corrosion test apparatus for simulating the formation of salt-containing gases according to claim 1, characterized in that, Also includes: The gas cylinder is connected to the gas mixing tank via the second exhaust pipeline. The second exhaust pipeline is equipped with a two-stage gas pressure reducing valve and a mixed gas heat transfer oil tank.

10. The dew point corrosion test apparatus for simulating the formation of salt-containing gases according to claim 8, characterized in that, Also includes: Waste liquid and waste gas collection tanks used to collect waste liquid and waste gas discharged from the raw material tank, distillation device and experimental chamber.

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