CN210514049U - Top corrosion testing device for variable wind field regulation and control in high-pressure kettle - Google Patents
Top corrosion testing device for variable wind field regulation and control in high-pressure kettle Download PDFInfo
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- CN210514049U CN210514049U CN201921073332.7U CN201921073332U CN210514049U CN 210514049 U CN210514049 U CN 210514049U CN 201921073332 U CN201921073332 U CN 201921073332U CN 210514049 U CN210514049 U CN 210514049U
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Abstract
The utility model belongs to the field of metal corrosion, in particular to top corrosion test device of variable wind field regulation and control in autoclave. The method comprises the following steps: the system comprises a sample loading plate, an electrochemical workstation, a variable wind field supply system, a condensing system, a pressure control system, a temperature control system and a computer distributed control system DCS. The sample loading plate comprises a sample loading plate body made of an insulating material and used for loading a sample; the electrochemical workstation is connected with the three-electrode system sample through a lead and is used for collecting and recording electrochemical corrosion data in real time; the variable wind field supply system comprises a corrosion-resistant fan, a variable wind field air supply adapter and a variable frequency motor; the condensing system comprises a circulating condensing medium box, a circulating cooling pipeline and a first temperature sensor for detecting the temperature of a cooling medium in the circulating condensing medium box. Testing arrangement's advantage lies in can be with low experiment running cost, usable electrochemistry test system acquires the relevant dynamics data of top corrosion process, monitors its evolution law over time.
Description
Technical Field
The utility model belongs to the metal corrosion field, in particular to top corrosion test device of variable wind field regulation and control in autoclave.
Background
Top Corrosion (TLC) means that during the transportation of oil and gas in pipelines, condensed water is formed in the upper half part of the inner wall of the pipeline due to the temperature of the pipeline wall being lower than the water dew point of water vapor, and volatile CO in the moisture2And the acidic medium is dissolved in the condensed water, so that the corrosion of the inner wall of the pipeline is caused. In recent years, accidents caused by roof erosion occur more frequently. Therefore, it is important to study the electrochemical mechanism of the top corrosion and establish the relevant test standard.
At present, the simulation devices for researching top corrosion are few, and mainly relate to a static simulation test device and a loop test device in an autoclave, the former cannot simulate the dynamic environment between a pipeline and a medium in an actual working condition, and the latter has high construction and operation costs and is not easy to clean the pipeline.
SUMMERY OF THE UTILITY MODEL
To the technical problem, the utility model provides a top corrosion test device of variable wind field regulation and control in autoclave concentrates on setting for, shows and controls test parameter through DCS, designs according to pipeline top condition under the pipeline actual operating mode, selects different wind field conditions to the regulation and control parameter of the required condensing temperature of meticulous setting test, the required pressure of sample test, corrosive medium temperature and moisture wind speed; the top corrosion test data of various materials can be obtained at high flux in one experiment, parallel comparison is carried out, and the data collection and material selection evaluation efficiency are accelerated.
The utility model discloses a realize through following technical scheme:
a variable wind field regulated top corrosion test apparatus in an autoclave, comprising:
the sample loading plate comprises a sample loading plate body made of an insulating material and used for loading samples, wherein the samples comprise a weight loss sample and a three-electrode system sample for electrochemical test;
the electrochemical workstation is connected with the three-electrode system sample through a lead and is used for collecting and recording electrochemical corrosion data in real time;
the variable wind field supply system comprises a corrosion-resistant fan, a variable wind field air supply adapter and a variable frequency motor; the corrosion-resistant fan is connected with the variable wind field air supply switching port and is arranged inside the high-pressure kettle, the variable frequency motor is arranged outside the high-pressure kettle and is connected with the corrosion-resistant fan through a transmission shaft, the variable frequency motor drives the corrosion-resistant fan to work through the transmission shaft, and a wind field required by testing is provided for the surface of the sample loading plate body through the variable wind field air supply switching port;
the condensation system comprises a circulating condensation medium tank, a circulating cooling pipeline and a first temperature sensor for detecting the temperature of a cooling medium in the circulating condensation medium tank; the sample loading plate is arranged at the bottom of the circulating condensing medium box and is in contact with the bottom of the box;
the pressure control system is used for providing pressure required by the test for the sample, and comprises an autoclave and a gas supply system for feeding gas into the autoclave, wherein the autoclave is inflated and pressurized to the pressure required by the test through the gas supply system;
the temperature control system is used for heating the corrosion medium in the autoclave body and controlling the temperature of the corrosion medium in the autoclave;
computer distributed control system DCS, including the DCS workstation, the DCS workstation with condensing system the pressure control system temperature control system and variable wind field supply system connects for synthesize the required condensing temperature of regulation and control sample test, the required pressure of sample test, corrode medium temperature and the required wind regime of sample test, in order to realize the simulation to various top corrosion operating mode.
Further, the variable wind field supply system further comprises a multichannel hot-wire anemometer for monitoring the wind speed in real time, wherein the multichannel hot-wire anemometer is arranged at a position 5-10 mm behind the sample in the sample loading plate body and used for testing the wind speed on the surface of the sample loading plate body.
Further, the structural shape of the air supply opening of the variable air field air supply switching opening is determined according to the shape of the sample.
Furthermore, the inner side wall of the circulating condensing medium box and the bottom of the box body are made of metal materials with high heat conductivity coefficients; the outer side wall of the circulating condensing medium box adopts heat insulating materials;
and circulating refrigerant is input into or output from the circulating condensing medium box through the circulating cooling pipeline.
Furthermore, a plurality of sample clamping grooves are formed in one side, close to the variable wind field air supply switching port, of the sample loading plate body, and the sample clamping grooves can simultaneously accommodate a plurality of groups of weightless samples and three-electrode system samples to be inserted simultaneously for testing.
Furthermore, the whole autoclave is sealed, and a sealing rubber ring and a sealing bolt are adopted at the sealing part of the autoclave cover and the autoclave body to ensure the whole sealing effect of the autoclave body;
and a transmission shaft between the corrosion-resistant fan and the variable frequency motor in the variable wind field supply system and the autoclave body are subjected to sealing treatment.
Further, the temperature control system comprises an electric heater arranged on the autoclave body for heating the corrosion medium and a second temperature sensor for measuring the temperature of the corrosion medium.
The utility model has the advantages that:
the device of the utility model can be designed according to the top condition of the pipeline under the actual working condition of the pipeline, test parameters are set, displayed and controlled in a centralized way through DCS, the device is designed according to the top condition of the pipeline under the actual working condition of the pipeline, different wind field conditions are selected, and the regulation and control parameters of temperature, pressure, cooling and moisture wind speed are set finely; the precise simulation of various top corrosion working conditions can be realized by comprehensively regulating and controlling the temperature, the pressure, the cooling and the variable wind field with low experimental operation cost; the top corrosion test data of various materials can be obtained at high flux in one experiment, parallel comparison is carried out, and the data collection and material selection evaluation efficiency is accelerated; and when sample weight loss test data is obtained, relevant kinetic data of the top corrosion process can be obtained by using an electrochemical test, and the time evolution rule of the top corrosion process is monitored.
Compared with the simulation of the loop pipeline device on the top corrosion in the prior art, the construction cost and the experimental operation cost of the test system provided by the utility model are both greatly reduced; compared with the existing autoclave simulation method and device, the device can realize the accurate simulation of the flowing state of the moisture and the liquid film generated by condensation on the surface of the sample.
Drawings
FIG. 1 is a schematic structural view of a variable wind field controlled top corrosion testing apparatus in an autoclave according to an embodiment of the present invention;
FIG. 2 is a schematic top view of a variable wind field regulated top corrosion test apparatus in an autoclave according to an embodiment of the present invention;
fig. 3 is a schematic diagram of the wire connection of the three-electrode system according to the embodiment of the present invention.
Reference numerals: 1. hot wire anemometer wires; CO 2.CO2A partial pressure monitoring sensor; 3. a second temperature sensor; 4. an electric heater; 5. etching the medium; 6. a first temperature sensor; 7. a gas supply pressure monitoring pressure gauge; 8. a pressure reducing valve; 9. a sample loading plate; 10. an autoclave; 11. sealing the rubber ring; 12. a seal bolt; 13. the outer side wall of the circulating condensing box; 14. the bottom of the box body of the circulating condensing box; 15. a three-electrode lead; 16. an atmospheric valve; 17. a safety valve; 18. a corrosion-resistant fan; 19. a porous air supply disc; 20. an oxygen dissolving instrument; 21. variable wind field air supply switching mouth.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
On the contrary, the invention is intended to cover alternatives, modifications, equivalents and alternatives which may be included within the spirit and scope of the invention as defined by the appended claims. Furthermore, in order to provide a better understanding of the present invention to the public, certain specific details are set forth in the following detailed description of the invention. It will be apparent to those skilled in the art that the present invention may be practiced without these specific details.
The embodiment of the utility model provides a top corrosion testing device regulated by a variable wind field in an autoclave, which is used for simulating the top corrosion condition of moisture in the pipe wall under the actual working condition at different flow rates; the device is suitable for simulating the top corrosion condition of a wet gas pipeline and a sulfur-containing oil pipeline in certain specific environments, and provides a test research means for researching the occurrence and development rules, influencing factors, material selection evaluation, screening and optimization of protective measures and establishing related standards of the top corrosion.
The top corrosion test device comprises:
the sample loading plate comprises a sample loading plate body made of an insulating material and used for loading samples, wherein the samples comprise a weight loss sample and a three-electrode system sample for electrochemical test;
the electrochemical workstation is connected with the three-electrode system sample through a lead and is used for collecting and recording electrochemical corrosion data in real time; specifically, the electrochemical workstation is disposed outside the autoclave, and the lead wires are connected to the electrochemical workstation through the autoclave.
The variable wind field supply system is used for providing wind field working conditions required by testing for the sample;
a condensing system in contact with and cooling said sample to bring said sample to a stable condensing temperature required for testing;
the pressure control system is used for providing pressure required by the test for the sample in a mode of supplying gas and pressurizing in the autoclave;
the temperature control system is used for heating the corrosion medium in the autoclave body and controlling the temperature of the corrosion medium in the autoclave so as to stabilize the temperature of the corrosion medium in the autoclave at the temperature required by the test;
computer distributed control system DCS, including the DCS workstation, the DCS workstation with condensing system the pressure control system temperature control system and variable wind field supply system connects for synthesize the required condensing temperature of regulation and control sample test, the required pressure of sample test, corrode medium temperature and the required wind regime of sample test, in order to realize the simulation to various top corrosion operating mode. Preferably, the computer distributed control system further comprises a control cabinet, a transmitter and a data transmission cable, wherein pressure, corrosive liquid temperature, condensation temperature, wind speed and electrochemical data in the high-pressure kettle in the whole set of test device are transmitted to the DCS workstation in real time through the transmitter, and various parameters of the test can be adjusted through the workstation.
In this embodiment, the variable wind field supply system includes a corrosion-resistant fan made of an anti-corrosion material, a variable wind field air supply adapter, a variable frequency motor, and a multi-channel hot-wire anemometer for monitoring wind speed in real time; the corrosion-resistant fan is connected with the variable wind field air supply switching port and is arranged inside the high-pressure kettle; the variable frequency motor is arranged outside the high-pressure kettle and is connected with the corrosion-resistant fan through a transmission shaft; the variable frequency motor drives the corrosion-resistant fan to work through a transmission shaft, and a wind field required by testing is provided for the surface of the sample loading plate body through the variable wind field air supply adapter;
the multichannel hot wire anemometer is arranged at a position 5-10 mm behind the sample in the sample loading plate body and used for testing the wind speed on the surface of the sample loading plate body.
Preferably, the corrosion-resistant fan is made of corrosion-resistant stainless steel materials with the same corrosion-resistant fan and the same high-pressure kettle; and the multi-channel hot-wire anemoscope and the variable frequency motor are connected with the distributed control system DCS of the computer, the testing wind speed can be set on the DCS workstation, the variable frequency motor can be started by the DCS workstation, the DCS workstation provides the suitable wind field working condition of the test sample through the real-time control on the variable frequency motor and the multi-channel hot-wire anemoscope, the wind speed is stabilized at the wind speed required by the test, the moisture wind with the fixed wind speed is blown to the surface of the sample loading plate in parallel, and therefore the top corrosion condition of the moisture in the pipe wall at different flow speeds under the actual working condition is simulated.
In this embodiment, the structural shape of the air supply opening of the variable air field air supply switching opening needs to be determined according to the shape of the sample, so that the condition of the sample surface air field conforms to the condition of the simulated working condition.
Specifically, the sample is an arc sample which can be cut from an actual pipeline, or a plane sample; when air is supplied, parallel air can be supplied along a plane sample, or arc air parallel to the sample can be supplied along an arc sample, or cylindrical or partial cylindrical/fan-shaped air with the same diameter as the arc sample can be supplied; therefore, the air supply port structure of the variable air field air supply switching port needs to be designed in an auxiliary mode through simulation of the air field in the autoclave and near the surface of the sample, and the condition of the air field on the surface of the sample is guaranteed to be consistent with the condition of simulating industrial and mining.
In this embodiment, the condensing system includes a circulating condensing medium tank, a circulating cooling pipeline, and a first temperature sensor for monitoring the temperature of the cooling medium in the circulating condensing medium tank;
the sample loading plate is arranged at the bottom of the circulating condensing medium box and is in contact with the bottom of the box; the inner side wall of the circulating condensing medium box and the bottom of the box body are made of metal materials with high heat conductivity coefficients, and particularly, pure copper, pure aluminum, aluminum alloy or pure silver can be used for ensuring the cooling effect on a contacted sample; the outer side wall of the circulating condensation medium box adopts a heat insulation material to ensure the heat preservation effect of the condensation medium; wherein, the circulating condensing medium box is arranged in the autoclave and is positioned above the corrosive medium in the autoclave, and preferably, the circulating condensing medium box can be fixedly arranged at the lower part of the autoclave cover. Preferably, a buckle is designed at the bottom of the circulating condensing medium box and used for installing the sample loading plate.
And circulating refrigerant is input into or output from the circulating condensation medium box through the circulating cooling pipeline, and the temperature of the circulating refrigerant in the circulating condensation medium box is stabilized at a condensation temperature value required by testing through the first temperature sensor and the DCS workstation.
Specifically, the condensing temperature can be set on the DCS workstation, a circulating refrigerant is injected into the circulating condensing medium box through the circulating cooling pipeline, the monitoring temperature sensor detects the temperature of the circulating refrigerant, the circulating refrigerant in the circulating condensing medium box is stabilized at the condensing temperature value required by the test through the circulating cooling pipeline, the circulating condensing medium box, the monitoring temperature sensor and the DCS workstation, and the sample is in the condensing temperature value required by the stable test due to the fact that the sample is in contact with the bottom of the circulating condensing medium box.
In this embodiment, a plurality of sample card slots are arranged on one side of the sample loading plate body close to the variable wind field air supply switching port, and the plurality of sample card slots can simultaneously accommodate a plurality of groups of weightless samples and three-electrode system samples to be simultaneously inserted for testing.
Preferably, the sample loading plate is installed at the bottom of the circulating condensing medium box through a buckle, and the sample on the sample loading plate is insulated from the bottom of the circulating condensing medium box;
specifically, before installation, the bottom of the box body with high heat conductivity coefficient is coated with insulating heat-conducting silica gel so as to ensure the insulation between the three-electrode system sample and the weightless sample and the bottom of the box body;
preferably, the conducting wire connected with the three-electrode system sample and the electrochemical workstation adopts an enameled wire with an outer insulating material, and the conducting wire is sealed by sealant at the position penetrating through the bottom of the circulating condensing medium box body, so that the refrigerant in the circulating condensing medium box is prevented from leaking;
in the embodiment, the pressure control system comprises an autoclave, a gas supply system for supplying gas to the autoclave, a pressure gauge for detecting the pressure in the autoclave, a safety valve and a vent valve which are arranged on the autoclave; the autoclave was inflated and pressurized to the pressure required for the test by the gas supply system.
Preferably, the gas supply system comprises a gas supply source, a gas supply pipeline connected with the gas supply source for supplying gas to the autoclave, a gas supply pressure monitoring pressure gauge arranged on the gas supply pipeline, and a pressure reducing valve; the autoclave comprises an autoclave body and an autoclave cover, and the safety valve and the vent valve of the pressure gauge for detecting the pressure in the autoclave can be arranged on the autoclave cover; a gas supply line may pass through the autoclave body into the interior of the autoclave. The gas supply source is a high-pressure storage tank or a gas cylinder, the autoclave is inflated and pressurized to the pressure required by the test in a mode of externally connecting the high-pressure storage tank or the gas cylinder, the part of the gas supply pipeline positioned inside the autoclave is connected with a porous gas supply disc, and the porous gas supply disc is arranged at the bottom of the autoclave.
Preferably, in order to maintain the pressure stability, the autoclave is sealed as a whole, and a sealing rubber ring and a sealing bolt are adopted at the sealing position of the autoclave cover and the autoclave body to ensure the whole sealing effect of the autoclave body. And a transmission shaft between the corrosion-resistant fan and the variable frequency motor in the variable wind field supply system and the autoclave body are also required to be sealed, specifically, a stainless steel pipe is sleeved outside the transmission shaft, one end of the stainless steel pipe is connected with the autoclave body in a welding manner, and the other end of the stainless steel pipe is welded on a shell of the variable frequency motor, so that a good sealing effect between the transmission shaft and the autoclave body is realized.
In the embodiment, the temperature control system comprises an electric heater arranged on the autoclave body for heating the corrosive medium, and a second temperature sensor for measuring the temperature of the corrosive medium; specifically, the second temperature sensor may adopt a thermocouple type temperature sensor; the electric heater adopts resistance heating.
And (4) starting an electric heater on the DCS workstation to heat the corrosive medium, combining a second temperature sensor, using PID control to keep the temperature of the corrosive liquid at a temperature value required by testing, and releasing pressure through an emptying valve during overpressure. Wherein the corrosive medium is taken from the site of the oil and gas transmission pipeline or configured according to requirements.
The process of testing by adopting the top corrosion testing device regulated by the variable wind field in the autoclave in the embodiment comprises the following steps:
selecting a variable wind field air supply switching port according to the shape of the sample;
loading the three-electrode sample and the weightless sample into a clamping groove of a sample loading plate;
pouring a corrosion medium into the high-pressure kettle;
injecting cooling medium into the circulating condensation medium box, setting the condensation temperature on the DCS workstation, and starting the circulating condenser;
pressurizing the autoclave to the pressure required by the test;
heating the corrosion medium in the autoclave to reach the temperature required by the test;
after the test pressure, the temperature of a corrosive medium and the condensation temperature in the high-pressure kettle are stable, setting the test wind speed on a DCS workstation, starting a variable frequency fan, and monitoring in real time through a multi-channel hot wire anemometer to enable the wind speed to be stable at the wind speed required by the test;
blowing the wet air with fixed air speed to the surface of the sample loading plate so as to simulate the top corrosion condition of the wet air in the pipe wall under different flow speeds under the actual working condition;
monitoring corrosion data in real time through an electrochemical workstation;
and taking out the weight loss sample after the test to detect the corrosion weight loss condition.
Specifically, the test procedure comprises the following steps:
and selecting a specific air supply adapter according to the sample condition and installing the adapter. The sample can be an arc sample cut from an actual pipeline or a plane sample; when air is supplied, parallel air can be supplied along a plane sample, or arc air parallel to the sample can be supplied along an arc sample, or cylindrical or partial cylindrical/fan-shaped air with the same diameter as the arc sample can be supplied; therefore, the air supply port structure of the variable air field air supply switching port needs to be designed in an auxiliary mode through simulation of the air field in the high-pressure kettle and near the surface of the sample, and the condition of the air field on the surface of the sample is ensured to be consistent with the condition of simulating industrial and mining;
loading a three-electrode sample (wherein a reference electrode and an auxiliary electrode both use a solid electrode) and a weightless sample into a clamping groove of a sample loading plate, installing the sample loading plate provided with a buckle at the bottom of a circulating condensing medium box, and coating insulating silica gel at the bottom of the circulating condensing medium box with high heat conductivity coefficient before installation to ensure the insulation between the three-electrode sample/the weightless sample and a metal cooling bottom; the three-electrode system sample is connected with the electrochemical workstation through a lead, the lead adopts an enameled wire with an outer coating insulating material, and the seal gum is used for sealing the lead at the position where the lead passes through the metal cooling bottom, so that the refrigerant is prevented from leaking; hot wire anemoscope probes are arranged close to the rear part of each group of three-electrode samples/weightless samples and used for monitoring the wind speed of moisture;
preparing a corrosion solution according to a set value, pouring the corrosion solution into the high-pressure kettle, wherein the liquid level of the corrosion solution is lower than the bottom surface of the sample loading plate, and the distance between the two can be adjusted according to the test requirement; screwing a sealing bolt on a high-pressure kettle cover provided with a pressure gauge, a temperature sensor, a sample loading plate, an emptying valve, a safety valve and a condensing system;
and injecting a cooling medium into the circulating condensation medium box, setting a condensation temperature on the DCS workstation, starting the circulating condenser, detecting the temperature of the circulating refrigerant by the monitoring temperature sensor, stabilizing the circulating refrigerant in the circulating condensation medium box at a condensation temperature value required by the test through the circulating cooling pipeline, the circulating condensation medium box, the monitoring temperature sensor and the DCS workstation, and enabling the sample to be at the condensation temperature value required by the stable test due to the fact that the sample is in contact with the bottom of the circulating condensation medium box.
Before pressurization, deoxidizing operation is carried out on a corrosive medium in the autoclave, high-purity inert gas is introduced through a gas inlet, and meanwhile, a vent valve is opened to carry out deoxidizing operation; after deoxidization, opening a gas supply electromagnetic valve externally connected with a high-pressure storage tank or a gas cylinder through a DCS (distributed control system) workstation, pressurizing the inside of the autoclave to the pressure required by testing, releasing the pressure through an emptying valve when the pressure is over high, and ensuring the pressure to be kept in the pressure-bearing safety range of the autoclave by using a safety valve;
starting an electric heating system on a DCS workstation to heat a corrosive medium, combining a thermocouple type temperature sensor, using PID control to keep the temperature of corrosive liquid at a temperature value required by testing, and releasing pressure through an emptying valve when overpressure occurs;
setting a test wind speed on a DCS workstation, starting a variable frequency fan, enabling the wind speed to be stabilized at the wind speed required by the test through real-time monitoring of the variable frequency fan and a hot wire anemoscope, and blowing the moisture wind with the fixed wind speed to the surface of the sample loading plate in parallel, thereby simulating the top corrosion condition of the moisture in the pipe wall under different flow speeds under the actual working condition;
starting an electrochemical workstation, and starting to record electrochemical data so as to monitor electrochemical corrosion data over time;
and (4) taking out the weight loss sample after the test is finished, and detecting the weight loss condition of the sample.
The following is a description of a flat sample as shown in FIG. 1:
a plane sample is used, so that a plane air supply adapter is selected, the variable wind field air supply adapter 21 is flat, the variable wind field air supply adapter 21 is connected with the corrosion-resistant fan 18, and parallel air can be supplied along the plane sample;
mounting a hot wire anemometer probe at the rear part of each group of samples, and connecting a hot wire anemometer lead 1;
pouring a prepared solution of the corrosive medium 5 into the high-pressure kettle 10, wherein the liquid level is lower than the bottom surface of the sample loading plate 9;
will be provided with CO2On the high-pressure kettle lid of partial pressure monitoring sensor 2, second temperature sensor 3, sample loading plate 9, atmospheric valve 16, relief valve 17 and condensing system (including circulation condensation medium case, circulative cooling pipeline, first temperature sensor 6), the autoclave wholly is sealed, at autoclave lid and autoclave kettle body sealing department, adopts sealed rubber ring 11 and sealing bolt 12 to guarantee the whole sealed effect of the kettle body.
Injecting a cooling medium into a circulating condensing medium box, starting a circulating condensing machine on a DCS workstation according to the test requirement, wherein the temperature of the circulating condensing machine is 10 ℃ in the example, controlling the temperature close to a sample to be 10 ℃, namely the condensing temperature to be 10 ℃, and monitoring the temperature of a refrigerant by using a second temperature sensor 6;
opening a gas cylinder gas supply electromagnetic valve on a DCS workstation, and introducing high-purity N through a gas inlet2Simultaneously opening an emptying valve 16 to perform deoxidization operation, wherein the nitrogen introducing time is more than or equal to 10 hours; after deoxidization, the electromagnetic valve for gas supply of the gas cylinder is closed on the DCS workstation, and low-temperature CO is opened2The gas supply electromagnetic valve of the pressure storage tank is provided with a gas supply pressure monitoring pressure gauge 7 and a pressure reducing valve 8 on a gas supply pipeline, and CO is introduced into a gas inlet2By CO2Partial pressure monitoring sensor for testing CO in autoclave2Partial pressure, controlling the pressure in the testPressure, in this case 1.6 MPa;
starting an electric heater 4 on a DCS (distributed control system) workstation to enable the temperature of a solution of a corrosive medium 5 to reach and be kept at a test temperature, and testing the temperature of the corrosive medium by adopting a first temperature sensor 6; this example is 80 ℃;
after the pressure to be tested, the temperature of the corrosive solution and the condensation temperature are stable, starting a variable frequency fan, and setting the wind speed of the fan to be 1.3m/s on a DCS (distributed control system) workstation until the wind speed measured by a hot wire anemometer is stable;
operating an electrochemical workstation, starting to record electrochemical data, and testing for 24 hours;
and (4) taking out the weight loss sample after the test is finished, and detecting the weight loss condition of the sample.
Claims (7)
1. A variable wind field regulated and controlled top corrosion test device in an autoclave, comprising:
the sample loading plate comprises a sample loading plate body made of an insulating material and used for loading samples, wherein the samples comprise a weight loss sample and a three-electrode system sample for electrochemical test;
the electrochemical workstation is connected with the three-electrode system sample through a lead and is used for collecting and recording electrochemical corrosion data in real time;
the variable wind field supply system comprises a corrosion-resistant fan, a variable wind field air supply adapter and a variable frequency motor; the corrosion-resistant fan is connected with the variable wind field air supply switching port and is arranged inside the high-pressure kettle, the variable frequency motor is arranged outside the high-pressure kettle and is connected with the corrosion-resistant fan through a transmission shaft, the variable frequency motor drives the corrosion-resistant fan to work through the transmission shaft, and a wind field required by testing is provided for the surface of the sample loading plate body through the variable wind field air supply switching port;
the condensation system comprises a circulating condensation medium tank, a circulating cooling pipeline and a first temperature sensor for detecting the temperature of a cooling medium in the circulating condensation medium tank; the sample loading plate is arranged at the bottom of the circulating condensing medium box and is in contact with the bottom of the box;
the pressure control system is used for providing pressure required by the test for the sample, and comprises an autoclave and a gas supply system for feeding gas into the autoclave, wherein the autoclave is inflated and pressurized to the pressure required by the test through the gas supply system;
the temperature control system is used for heating the corrosion medium in the autoclave body and controlling the temperature of the corrosion medium in the autoclave;
computer distributed control system DCS, including the DCS workstation, the DCS workstation with condensing system the pressure control system temperature control system and variable wind field supply system connects for synthesize the required condensing temperature of regulation and control sample test, the required pressure of sample test, corrode medium temperature and the required wind regime of sample test, realize the simulation to various top corrosion operating mode.
2. The variable wind field controlled roof corrosion test device in the autoclave according to claim 1, wherein the variable wind field supply system further comprises a multichannel hot wire anemometer for monitoring wind speed in real time, the multichannel hot wire anemometer is disposed 5-10 mm behind the sample in the sample loading plate body, and is used for testing the wind speed on the surface of the sample loading plate body.
3. The variable wind field regulated and controlled top corrosion test device in an autoclave of claim 1, wherein the structural shape of the air supply outlet of the variable wind field air supply adapter is determined according to the shape of a sample.
4. The variable wind field regulated and controlled top corrosion test device in the autoclave of claim 1, wherein the inner side wall of the circulating condensing medium tank and the bottom of the tank body are made of metal materials with high heat conductivity coefficients; the outer side wall of the circulating condensing medium box adopts heat insulating materials;
and circulating refrigerant is input into or output from the circulating condensing medium box through the circulating cooling pipeline.
5. The device for testing the variable wind field regulated and controlled top corrosion in the autoclave according to claim 1, wherein a plurality of sample clamping grooves are formed in one side, close to a variable wind field air supply adapter, of the sample loading plate body, and the plurality of sample clamping grooves can simultaneously accommodate a plurality of groups of weightless samples and three-electrode system samples to be inserted simultaneously for testing.
6. The variable wind field regulated and controlled top corrosion test device in the autoclave according to claim 1, wherein the whole autoclave is sealed, and a sealing rubber ring and a sealing bolt are adopted at the sealing position of the autoclave cover and the autoclave body to ensure the whole sealing effect of the autoclave body;
and a transmission shaft between the corrosion-resistant fan and the variable frequency motor in the variable wind field supply system and the autoclave body are subjected to sealing treatment.
7. The variable wind field regulated top corrosion test device in an autoclave of claim 1, wherein the temperature control system comprises an electric heater arranged on the autoclave body to heat the corrosive medium, and a second temperature sensor for measuring the temperature of the corrosive medium.
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| CN201921073332.7U CN210514049U (en) | 2019-07-10 | 2019-07-10 | Top corrosion testing device for variable wind field regulation and control in high-pressure kettle |
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| CN201921073332.7U CN210514049U (en) | 2019-07-10 | 2019-07-10 | Top corrosion testing device for variable wind field regulation and control in high-pressure kettle |
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| CN (1) | CN210514049U (en) |
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2019
- 2019-07-10 CN CN201921073332.7U patent/CN210514049U/en active Active
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