CN108956440B - Corrosion test device and method for liquid lead or liquid lead bismuth alloy - Google Patents
Corrosion test device and method for liquid lead or liquid lead bismuth alloy Download PDFInfo
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- CN108956440B CN108956440B CN201810877654.0A CN201810877654A CN108956440B CN 108956440 B CN108956440 B CN 108956440B CN 201810877654 A CN201810877654 A CN 201810877654A CN 108956440 B CN108956440 B CN 108956440B
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- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
- G01N17/006—Investigating resistance of materials to the weather, to corrosion, or to light of metals
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
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Abstract
The invention discloses a corrosion test device and a corrosion test method for liquid lead or liquid lead-bismuth alloy, wherein the device comprises a box body, a glove box, a flange and a test section body, wherein the box body is provided with the glove box, the flange is fixed on the bottom plate of the glove box, and the test section body is arranged on the box body; the device also comprises a fixing device and a sealing device; the device also comprises a seal head, a gland and a support rod; the device also comprises a sampling operation window and a transition cabin which are arranged on the glove box; the glove box is characterized by further comprising a gas purification system connected with the inner space of the glove box, wherein the gas purification system is used for removing oxygen and water in the glove box. The device is a corrosion test device which has the advantages of deoxidization, water removal, simple structure, replaceable sealing structure and reliable sealing and is suitable for liquid lead or liquid lead-bismuth alloy so as to meet the test requirements. The method is a method of using the device.
Description
Technical Field
The invention relates to the technical field of corrosion tests of nuclear engineering, in particular to a corrosion test device and method for liquid lead or liquid lead-bismuth alloy.
Background
The liquid lead or the liquid lead bismuth alloy has high safety and reliability as a reactor coolant, and can obviously improve the inherent safety of the reactor compared with the existing pressurized water reactor coolant, but the corrosion problem of the liquid lead or the liquid lead bismuth alloy to the structural material is one of the key engineering problems to be solved urgently in the design and development of the reactor type. The research and development of a new structural material with good compatibility with the liquid lead or the liquid lead bismuth alloy is a technical bottleneck which must be broken through in the development of the lead-based reactor, so that the corrosion mechanism and law of the structural material in the liquid lead or the liquid lead bismuth alloy are mastered through a dynamic simulation material corrosion test outside the reactor, the research, the screening and the development of the novel structural material are facilitated, and a basis is provided for the design of the lead-based reactor.
In the prior art, no published report is found about the corrosion test device for the liquid lead or the liquid lead-bismuth alloy.
Disclosure of Invention
In order to solve the problem that the corrosion test device for the liquid lead or the liquid lead bismuth alloy is not published and reported in the prior art, the invention provides the corrosion test device and the method for the liquid lead or the liquid lead bismuth alloy, wherein the corrosion test device has the advantages of oxygen removal, water removal, simple structure, replaceable sealing structure, reliable sealing and suitability for the liquid lead or the liquid lead bismuth alloy, so as to meet the test requirements. The method is a method of using the device.
In order to solve the problems, the corrosion test device and the corrosion test method for the liquid lead or the liquid lead-bismuth alloy provided by the invention solve the problems through the following technical points: a corrosion test device and method for liquid lead or liquid lead-bismuth alloy, the device includes the container body, there is glove box taking the form of box on the said container body, also include fixing to the flange on the bottom plate of glove box, there are intercommunicating pores on the said bottom plate, the said intercommunicating pore communicates with centre hole of the flange;
the test device is characterized by further comprising a test section body, wherein a straight pipe section in a straight pipe shape is arranged at the upper end of the test section body, the upper end of the straight pipe section is inserted into the glove box from the communicating hole, an inlet branch pipe used for introducing liquid lead or liquid lead-bismuth alloy into the straight pipe section is further arranged on the side face of the straight pipe section, and the inlet branch pipe is located below the bottom plate;
the sealing device is used for sealing a gap between the straight pipe section and the flange, and the fixing device is used for fixing the straight pipe section on the flange;
the upper end of the support rod is fixed on the lower end face of the seal head, the seal head is fixed on the upper end of the straight pipe section through the gland, the support rod is embedded in the straight pipe section, and the lower end of the support rod extends to the position below a connecting point of the inlet branch pipe on the straight pipe section;
the glove box comprises a glove box body, and is characterized by further comprising a sampling operation window and a transition cabin, wherein the sampling operation window and the transition cabin are arranged on the glove box body, the sampling operation window comprises gloves and hand holes formed in the wall of the glove box body, hand insertion ends of the gloves are connected with the hand holes, finger ends of the gloves are located inside the glove box body, the transition cabin comprises an inner side cabin door and an outer side cabin door, the inner side cabin door is used as a part of the wall of the glove box body, and a closed cavity is formed inside the transition cabin after the inner side cabin door and;
after the connection between the test section body and the flange is completed, the connection between the seal head and the test section body is completed, and the inner side cabin door is closed, the glove box is a closed cavity;
the glove box is characterized by further comprising a gas purification system connected with the inner space of the glove box, wherein the gas purification system is used for removing oxygen and water in the glove box.
According to the scheme, as the glove box is a closed cavity, the sampling operation window is actually formed by arranging a hand hole on the wall of the glove box, then the gloves with air tightness are installed in the glove box through the hand hole, the specific installation form can adopt the glove installation form of the existing edible fungus inoculation box, the gloves are equivalent to the flexible wall of the glove box, and operators can put the gloves in the gloves through hands to realize the transfer operation of corrosion samples in the glove box and a transition cabin; the glove box is a closed cavity, the flange can be welded on the bottom plate, the flange and the bottom plate connecting surface are sealed by using a circumferential weld, the flange and the bottom plate can also be connected by using bolts, and a sealing gasket is arranged on the flange and the bottom plate connecting surface to realize sealing.
The securing means and sealing means may be arranged to: the fixing device and the sealing device are realized by the following three components: the sealing ring is arranged in a gap between the straight pipe section and the flange, the fixing cap is connected with the flange through the connecting bolt, and after the connecting bolt is fastened, the fixing cap exerts extrusion force on the sealing ring, the gap between the straight pipe section and the flange is sealed through the sealing ring, and the test section body is fixedly connected with the flange through the sealing ring. By adopting the mode, because the friction force between the required sealing ring and the straight pipe section as well as the friction force between the required sealing ring and the flange are large, the central hole on the flange can be a step hole with a step, and the large end of the step hole faces upwards, so that the sealing ring can be pressed and held in a specific area to increase the positive pressure between the sealing ring and the straight pipe section as well as between the sealing ring and the flange in the process of providing larger pressure for the sealing ring. Preferably, it is also provided that the sealing means comprises a sealing pressure pad, a connecting bolt and a sealing ring, wherein the sealing pressure pad replaces the function of the fixing cap in the above-mentioned solution for pressing the sealing pad under the function of the connecting bolt to obtain the sealing surface, except that since the sealing pressure pad is rigidly connected to the flange through the connecting bolt, the fixing means in this solution comprises a fixing cap which is supported on the sealing pressure pad or the flange through the lower end of the fixing cap by using a nut, such as a nut, which is in threaded connection with the straight pipe section, to provide a reliable fixing constraint for the test section body relative to the flange.
The transition cabin can be set to include the cabin body that is the tube-shape and be used for connecting the inboard hatch door of cabin body one side and be used for connecting the outside hatch door at the cabin body opposite side, and the accommodation space of transition cabin is enclosed into to cabin body, inboard hatch door, outside hatch door three, simultaneously, the inboard hatch door is when being regarded as glove box lateral wall partly, as the isolation component in glove box and transition cabin two spaces, and outside hatch door is as the hatch door between interior space of transition cabin and this device external environment.
The gas purification system is used for removing oxygen and water, and a large number of devices for removing oxygen and water in the prior art are used, and as a person skilled in the art, the purpose can be achieved by enabling gas inside the glove box to flow through the gas purification system.
When the device is used specifically, the corrosion test of the corrosion sample can be completed according to the following steps:
s1, completing the connection between the test section body and the flange, specifically: by the sealing means and fixing means provided above;
the connection of the corrosion sample and the support rod is completed, and the method specifically comprises the following steps: the connection of the corrosion sample, the support rod and the end enclosure is completed;
accomplish the support rod and be connected with experimental section body, specifically do: the connection of the seal head on the test section body is realized by utilizing the gland, the gland can be arranged to be in threaded connection with the test section body, and the gland applies force towards the test section body to the seal head to complete the connection;
s2, starting a main loop to carry out a corrosion test: introducing liquid lead or liquid lead-bismuth alloy into the area where the corrosion sample is located through the inlet branch pipe to perform corrosion test, wherein the main loop is equipment for providing the liquid lead or the liquid lead-bismuth alloy and can also be understood as a pipeline for correspondingly supplying the liquid lead or the liquid lead-bismuth alloy;
s3, after the corrosion test is finished, the corrosion sample is placed in the glove box in a mode of lifting the corrosion sample, and before the corrosion sample is placed in the glove box, oxygen and water in the glove box are removed through a gas purification system;
and S4, separating the corrosion sample from the support rod through the sampling operation window, then opening the inner side cabin door, transferring the corrosion sample into the transition cabin from the glove box, and then closing the inner side cabin door. In the step, the restraint of the seal head on the gland is removed, the gland is lifted, so that the corrosion sample can be transferred into the glove box from the test section body, the corrosion sample is separated from the support rod in the glove box in an oxygen-free, water-free or oxygen-less and water-less environment, then the inner side cabin door is opened, the corrosion sample is transferred into the transition cabin, and then the inner side cabin door is closed;
s5, taking out the corrosion sample from the device: the operator removes the corrosion sample from the transition compartment through the outboard hatch.
The invention controls the sampling process to be always in an oxygen-free and water vapor-free or oxygen-less and water vapor-less environment through the gas purification system, and avoids or avoids the influence of water vapor and oxygen on the surface appearance of the sample as much as possible, thereby ensuring the accuracy and reliability of the test result.
According to the invention, the sealing test section body is sealed by pressing the top of the test section body by the seal head, the sealing and fixing between the test section body and the glove box are realized by the sealing device and the fixing device, and the sealing between the flange and the glove box is realized by adopting a welding mode or a mode of connecting and matching the seal gasket by bolts, so that the integral sealing reliability of the test device can be ensured, the high-temperature operation requirement can be met, meanwhile, the corresponding structure is simple, the corresponding sealing or sealing assembly can be conveniently obtained, each component which is easy to cause sealing leakage can be disassembled and replaced, the later maintainability is strong, and the cost can be greatly saved.
The inlet branch pipe of the test section body is positioned above the corrosion sample, and when the pipe orifice of the inlet branch pipe and the outlet below the test section body are both connected with the main loop, the structural design of the device is beneficial to the recovery of liquid lead or liquid lead-bismuth alloy after the corrosion test is finished.
As a person skilled in the art, it is not possible to guarantee a one hundred percent removal of water vapor and oxygen due to the gas purification system, and finally the effect of water vapor and oxygen inside the glove box on the corrosion sample is within acceptable limits. In the structural design of the invention, because the flow path of the liquid lead or the liquid lead-bismuth alloy is positioned at the outer side of the glove box in the experimental process, and the corrosion sample is placed in the glove box after the corrosion test is completed on the corrosion sample, the heat in the experimental process can be prevented from influencing the pressure and the temperature in the glove box to influence the sealing performance of the glove box, and the influence of the heat on the content of water vapor and oxygen in the glove box can be avoided.
In this scheme, set up the cockpit, when this device received the corruption sample and shifted out the corruption sample, all can pass through the cockpit shifts the corruption sample, like this, because the environment of cockpit compares in this device outside environment, steam and oxygen content still less, so pass through the cockpit, when this device received the corruption sample and shifted out the corruption sample, can realize getting into the glove box in the quantity of steam and oxygen still less.
As a further technical scheme of the device:
for the convenience mention and release head and support rod's connector, still including setting up the elevating gear in the glove box, elevating gear is located the head directly over, elevating gear is used for mentioning and releasing the head. There are many types of lifting devices in the prior art, and it is preferable to provide the lifting device as a ratchet lifting device having a simple structure, a light weight, and a pure mechanical structure to facilitate reliable performance in certain high temperature environments.
In order to facilitate the transfer operation of the corrosion sample, the sampling operation window is arranged on the side surface of the glove box, the transition cabin is arranged on the side surface of the glove box, and the side where the sampling operation window is located and the side where the transition cabin is located are different.
As a concrete implementation mode of the gas purification system, the gas purification system comprises a deoxidizing device, a water removing device, an activated carbon filter and a circulating fan, wherein the inlet end and the outlet end of the circulating fan are connected with the inner space of the glove box through pipelines, and the deoxidizing device, the water removing device and the activated carbon filter are connected in series on the pipelines.
In order to facilitate the connection of the device and a main loop, a pipe orifice of the inlet branch pipe is an inlet for introducing liquid lead or liquid lead-bismuth alloy, the direction of the inlet is vertical to the length direction of the straight pipe section, the lower end of the straight pipe section is also provided with a bent pipe section, the pipe orifice of the bent pipe section is an outlet for the liquid lead or the liquid lead-bismuth alloy, the direction of the outlet is vertical to the length direction of the straight pipe section, and the direction of the inlet is opposite to the direction of the outlet;
the corrosion sample position connected to the lower end of the support rod is positioned between the connection point of the inlet branch pipe on the straight pipe section and the bending point of the straight pipe section.
In order to realize the thermal compensation of the liquid lead or the liquid lead-bismuth alloy and conveniently carry out the corrosion test of the corrosion sample at different temperatures, the device also comprises a heating device, and the heating device is used for heating the pipe section between the inlet and the outlet.
As a heating device implementation scheme with simple structure, large adjustable range of heating power and high heat utilization rate, the heating device is an electric heating wire wound on the corresponding pipe section and also comprises a heat preservation layer wrapped outside the heating device.
In order to facilitate the connection and the disconnection of the support rod and the corrosion sample, the lower end of the support rod is also provided with an internal thread hole, and the internal thread hole is used for forming a threaded connection relation with the corrosion sample. Correspondingly, the upper end of the corrosion sample is provided with an external thread column matched with the internal thread hole.
In order to visually reflect whether the meteorological environment in the glove box meets the requirements of the corrosion test, the method is set as follows: the device also comprises an oxygen analyzer and a water analyzer which are arranged inside the glove box.
The method is a test method of any one of the devices, and comprises the following steps which are sequentially carried out:
s1, completing the connection between the test section body and the flange, the connection between the corrosion sample and the support rod, and the connection between the support rod and the test section body;
s2, starting a main loop to carry out a corrosion test: introducing liquid lead or liquid lead bismuth alloy to the area where the corrosion sample is located through the inlet branch pipe to perform a corrosion test;
s3, after the corrosion test is finished, the corrosion sample is placed in the glove box in a mode of lifting the corrosion sample, and before the corrosion sample is placed in the glove box, oxygen and water in the glove box are removed through a gas purification system;
s4, separating the corrosion sample from the support rod through the sampling operation window, then opening the inner side cabin door, transferring the corrosion sample into the transition cabin from the glove box, and then closing the inner side cabin door;
and S5, taking out the corrosion sample from the device.
The invention has the following beneficial effects:
the device and the method are adopted:
the invention controls the sampling process to be always in an oxygen-free and water vapor-free or oxygen-less and water vapor-less environment through the gas purification system, and avoids or avoids the influence of water vapor and oxygen on the surface appearance of the sample as much as possible, thereby ensuring the accuracy and reliability of the test result.
According to the invention, the sealing test section body is sealed by pressing the top of the test section body by the seal head, the sealing and fixing between the test section body and the glove box are realized by the sealing device and the fixing device, and the sealing between the flange and the glove box is realized by adopting a welding mode or a mode of connecting and matching the seal gasket by bolts, so that the integral sealing reliability of the test device can be ensured, the high-temperature operation requirement can be met, meanwhile, the corresponding structure is simple, the corresponding sealing or sealing assembly can be conveniently obtained, each component which is easy to cause sealing leakage can be disassembled and replaced, the later maintainability is strong, and the cost can be greatly saved.
The inlet branch pipe of the test section body is positioned above the corrosion sample, and when the pipe orifice of the inlet branch pipe and the outlet below the test section body are both connected with the main loop, the structural design of the device is beneficial to the recovery of liquid lead or liquid lead-bismuth alloy after the corrosion test is finished.
As a person skilled in the art, it is not possible to guarantee a one hundred percent removal of water vapor and oxygen due to the gas purification system, and finally the effect of water vapor and oxygen inside the glove box on the corrosion sample is within acceptable limits. In the structural design of the invention, because the flow path of the liquid lead or the liquid lead-bismuth alloy is positioned at the outer side of the glove box in the experimental process, and the corrosion sample is placed in the glove box after the corrosion test is completed on the corrosion sample, the heat in the experimental process can be prevented from influencing the pressure and the temperature in the glove box to influence the sealing performance of the glove box, and the influence of the heat on the content of water vapor and oxygen in the glove box can be avoided.
In this scheme, set up the cockpit, when this device received the corruption sample and shifted out the corruption sample, all can pass through the cockpit shifts the corruption sample, like this, because the environment of cockpit compares in this device outside environment, steam and oxygen content still less, so pass through the cockpit, when this device received the corruption sample and shifted out the corruption sample, can realize getting into the glove box in the quantity of steam and oxygen still less.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of a corrosion test apparatus for liquid lead or liquid lead-bismuth alloy according to the present invention;
FIG. 2 is a schematic diagram of a structure of one embodiment of an etching sample.
The labels in the figure are respectively: 1. the device comprises a test section body, 2, flanges, 3, a sealing pressure pad, 4, a fixing cap, 5, a gland, 6, a seal head, 7, a connecting bolt, 8, a sealing ring, 9, a bottom plate, 10, a support rod, 11, a corrosion sample, 12, a heating device, 13, a lifting device, 14, a sampling operation window, 15, a glove box, 16, a transition cabin, 17 and a gas purification system.
Detailed Description
The present invention will be described in further detail with reference to the following examples, but the present invention is not limited to the following examples:
example 1:
as shown in fig. 1 and fig. 2, the embodiment provides a specific implementation manner of a corrosion test apparatus for liquid lead or liquid lead-bismuth alloy, the apparatus includes a box body, a glove box 15 in a box shape is arranged on the box body, and further includes a flange 2 fixed on a bottom plate 9 of the glove box 15, a communication hole is arranged on the bottom plate 9, and the communication hole is communicated with a central hole of the flange 2;
the test device is characterized by further comprising a test section body 1, wherein a straight pipe section in a straight pipe shape is arranged at the upper end of the test section body 1, the upper end of the straight pipe section is inserted into the glove box 15 through the communicating hole, an inlet branch pipe used for introducing liquid lead or liquid lead bismuth alloy into the straight pipe section is further arranged on the side face of the straight pipe section, and the inlet branch pipe is located below the bottom plate 9;
the sealing device is used for sealing a gap between the straight pipe section and the flange 2, and the fixing device is used for fixing the straight pipe section on the flange 2;
the device is characterized by further comprising a seal head 6, a gland 5 and a support rod 10, wherein the upper end of the support rod is fixed on the lower end face of the seal head 6, the seal head 6 is fixed at the upper end of the straight pipe section through the gland 5, the support rod 10 is embedded into the straight pipe section, and the lower end of the support rod 10 extends to the position below a connecting point of the inlet branch pipe on the straight pipe section;
the glove box is characterized by further comprising a sampling operation window 14 and a transition cabin 16, wherein the sampling operation window 14 is arranged on the glove box 15, the sampling operation window 14 comprises gloves and hand holes formed in the wall of the glove box 15, hand insertion ends of the gloves are connected with the hand holes, finger ends of the gloves are located inside the glove box 15, the transition cabin 16 comprises an inner side cabin door and an outer side cabin door, the inner side cabin door is used as a part of the wall of the glove box 15, and after the inner side cabin door and the outer side cabin door are closed, a closed cavity is formed inside the transition cabin 16;
after the connection between the test section body 1 and the flange 2 is completed, the connection between the seal head 6 and the test section body 1 is completed, and the inner side cabin door is closed, the glove box 15 is a closed cavity;
and a gas purification system 17 connected to the inner space of the glove box 15, wherein the gas purification system 17 is used for removing oxygen and water in the glove box 15.
In the scheme, as the glove box 15 is a closed cavity, the sampling operation window 14 is actually formed by forming a hand hole in the wall of the glove box 15, and then the gloves with air tightness are installed in the glove box 15 through the hand hole, the specific installation form can adopt the glove installation form of the existing edible fungus inoculation box, the gloves are equivalent to the flexible wall of the glove box 15, and an operator can transfer the corrosion samples 11 in the glove box 15 and the transition cabin 16 by putting the gloves in the hands; as the glove box 15 is a closed cavity, the flange 2 can be welded on the bottom plate 9, the connection surface of the flange 2 and the bottom plate 9 is sealed by using a circumferential weld, the flange 2 and the bottom plate 9 can also be connected by adopting bolts, and a sealing gasket 8 is arranged on the connection surface of the flange 2 and the bottom plate 9 to realize sealing.
The securing means and sealing means may be arranged to: the fixing device and the sealing device are realized by the following three components: fixing cap 4, connecting bolt 7 and sealing washer, the sealing washer sets up in the clearance between straight tube section and flange 2, fixing cap 4 passes through connecting bolt 7 and flange 2 is connected, and in the fastening back of connecting bolt 7, the extrusion force is applyed to the sealing washer to fixing cap 4, realizes through the sealing washer that the clearance is sealed between straight tube section and the flange 2, realizes the fixed connection between test section body 1 and the flange 2 through the sealing washer. By adopting the mode, because the friction force between the required sealing ring and the straight pipe section as well as the friction force between the required sealing ring and the flange 2 are large, the central hole on the flange 2 can be set to be a step hole with a step, and the large end of the step hole faces upwards, so that the sealing ring can be pressed and held in a specific area to increase the positive pressure between the sealing ring and the straight pipe section as well as between the sealing ring and the flange 2 in the process of providing larger pressure for the sealing ring. Preferably, it is also possible to provide that the sealing means comprises a sealing pressure pad 3, a connecting bolt 7 and a sealing ring, wherein the sealing pressure pad 3 replaces the function of the fixing cap 4 in the above-mentioned solution for pressing the sealing gasket 8 under the function of the connecting bolt 7 to obtain a sealing surface, and the difference is that since the sealing pressure pad 3 is rigidly connected to the flange 2 by the connecting bolt 7, the fixing means in this solution comprises the fixing cap 4, and the fixing cap 4 is a nut, such as a nut screwed to the straight pipe section, supported on the sealing pressure pad 3 or on the flange 2 by the lower end of the fixing cap 4, and provides the test section body 1 with a reliable fixing constraint relative to the flange 2.
The transition cabin 16 can be set to include a cylindrical cabin body, an inner side cabin door used for being connected to one side of the cabin body and an outer side cabin door used for being connected to the other side of the cabin body, the inner side cabin door and the outer side cabin door enclose an accommodating space of the transition cabin 16, meanwhile, the inner side cabin door is used as an isolation component of the space between the glove box 15 and the transition cabin 16 while being used as a part of the side wall of the glove box 15, and the outer side cabin door is used as a cabin door between the inner space of the transition cabin 16 and the external environment.
The gas purification system 17 is used to remove oxygen and water, and there are a number of devices used in the prior art to remove oxygen and water from the gas, as those skilled in the art will appreciate, so that the gas inside the glove box 15 can be passed through the gas purification system 17 for this purpose.
When the device is used specifically, the corrosion test of the corrosion sample can be completed according to the following steps:
s1, completing the connection of the test section body 1 and the flange 2, specifically: by the sealing means and fixing means provided above;
the connection between the corrosion sample and the support rod 10 is completed, specifically: the connection of the corrosion sample, the support rod 10 and the end enclosure 6 is completed;
the connection of the supporting rod 10 and the test section body 1 is completed, and the method specifically comprises the following steps: the connection of the seal head 6 on the test section body 1 is realized by utilizing the gland 5, the gland 5 can be arranged to be in threaded connection with the test section body 1, and the seal head 6 is applied with force towards the test section body 1 through the gland 5 to complete the connection;
s2, starting a main loop to carry out a corrosion test: introducing liquid lead or liquid lead-bismuth alloy into the area where the corrosion sample is located through the inlet branch pipe to perform corrosion test, wherein the main loop is equipment for providing the liquid lead or the liquid lead-bismuth alloy and can also be understood as a pipeline for correspondingly supplying the liquid lead or the liquid lead-bismuth alloy;
s3, after the corrosion test is finished, the corrosion sample is placed into the glove box 15 in a mode of lifting the corrosion sample, and before the corrosion sample is placed into the glove box 15, oxygen and water in the glove box 15 are removed through the gas purification system 17;
and S4, completing the separation of the corrosion sample from the support rod 10 through the sampling operation window 14, then opening the inner side cabin door, transferring the corrosion sample from the glove box 15 to the transition cabin 16, and then closing the inner side cabin door. In the step, the restraint of the seal head 6 on the gland 5 is removed, the gland 5 is lifted, so that the corrosion sample 11 can be transferred from the test section body 1 into the glove box 15, the corrosion sample 11 is separated from the support rod 10 in the environment of no oxygen, no water or less oxygen and less water in the glove box 15, then the inner side cabin door is opened, the corrosion sample 11 is transferred into the transition cabin 16, and then the inner side cabin door is closed;
s5, taking out the corrosion sample from the device: the operator removes the corrosion sample 11 from the transition compartment 16 through the outboard hatch door.
The invention controls the sampling process to be always in the oxygen-free and water vapor-free or oxygen-less and water vapor-less environment through the gas purification system 17, and avoids or avoids the influence of water vapor and oxygen on the surface appearance of the sample as much as possible, thereby ensuring the accuracy and reliability of the test result.
According to the invention, the sealing test section body 1 is sealed by pressing the top of the test section body 1 by the seal head 6, the sealing and fixing between the test section body 1 and the glove box 15 are realized by the sealing device and the fixing device, and the sealing between the flange 2 and the glove box 15 is realized by adopting a welding mode or a mode of connecting and matching the seal gasket 8 by bolts, so that the whole sealing reliability of the test device can be ensured, the high-temperature operation requirement can be met, meanwhile, the corresponding structure is simple, the corresponding sealing or sealing assembly can be conveniently obtained, each component which easily causes the sealing leakage can be disassembled and replaced, the later maintainability is strong, and the cost can be greatly saved.
The inlet branch pipe of the test section body 1 is positioned above the corrosion sample, and when the pipe orifice of the inlet branch pipe and the lower outlet of the test section body 1 are both connected with the main loop, the structural design of the device is beneficial to the recovery of liquid lead or liquid lead-bismuth alloy after the corrosion test is finished.
As a person skilled in the art, it is not possible to guarantee a one hundred percent removal of water vapor and oxygen by the gas purification system 17, and finally the effect of water vapor and oxygen inside the glove box 15 on the corrosion of the sample 11 is within acceptable limits. In the structural design of the invention, because the flow path of the liquid lead or the liquid lead-bismuth alloy is positioned at the outer side of the glove box 15 in the experimental process, and the corrosion sample 11 is placed in the glove box 15 after the corrosion test is completed on the corrosion sample 11, the heat in the experimental process can be prevented from influencing the sealing performance of the glove box 15 due to the influence of the pressure and the temperature inside the glove box 15, and the influence of the heat on the content of water vapor and oxygen in the glove box 15 can be avoided.
In the scheme, the transition cabin 16 is arranged, and when the device receives the corrosion sample 11 and moves out the corrosion sample 11, the corrosion sample 11 can be transferred through the transition cabin 16, so that the environment of the transition cabin 16 is less in content of water vapor and oxygen compared with the environment outside the device, and the device can receive the corrosion sample 11 and move out the corrosion sample 11 through the transition cabin 16, so that the amount of the water vapor and the oxygen entering the glove box 15 is less.
Example 2:
the embodiment is further limited on the basis of the embodiment 1, as shown in fig. 1 and 2, in order to facilitate lifting and releasing the connection body of the seal head 6 and the support rod 10, the sealing device further comprises a lifting device 13 arranged in the glove box 15, the lifting device 13 is positioned right above the seal head 6, and the lifting device 13 is used for lifting and releasing the seal head 6. There are many types of lifting devices 13 known in the art, and it is preferable to provide the lifting device 13 as a ratchet lifting device 13 having a simple, lightweight, purely mechanical structure to facilitate reliable performance in certain high temperature environments.
In order to facilitate the transferring operation of the corrosion sample 11, the sampling operation window 14 is disposed on a side of the glove box 15, the transition chamber 16 is disposed on a side of the glove box 15, and the side of the sampling operation window 14 is different from the side of the transition chamber 16.
As a specific implementation manner of the gas purification system 17, the gas purification system 17 includes a deaerator, a water removal device, an activated carbon filter, and a circulation fan, an inlet end and an outlet end of the circulation fan are connected to an inner space of the glove box 15 through a pipeline, and the deaerator, the water removal device, and the activated carbon filter are all connected in series to the pipeline.
In order to facilitate the connection of the device and a main loop, a pipe orifice of the inlet branch pipe is an inlet for introducing liquid lead or liquid lead-bismuth alloy, the direction of the inlet is vertical to the length direction of the straight pipe section, the lower end of the straight pipe section is also provided with a bent pipe section, the pipe orifice of the bent pipe section is an outlet for the liquid lead or the liquid lead-bismuth alloy, the direction of the outlet is vertical to the length direction of the straight pipe section, and the direction of the inlet is opposite to the direction of the outlet;
the corrosion sample position connected to the lower end of the support rod 10 is positioned between the connection point of the inlet branch pipe on the straight pipe section and the bending point of the straight pipe section.
In order to realize the thermal compensation of the liquid lead or the liquid lead-bismuth alloy and conveniently carry out the corrosion test of the corrosion sample 11 at different temperatures, the device also comprises a heating device 12, wherein the heating device 12 is used for heating the pipe section between the inlet and the outlet.
As a heating device 12 implementation scheme with simple structure, large adjustable range of heating power and high heat utilization rate, the heating device 12 is an electric heating wire wound on a corresponding pipe section and also comprises a heat preservation layer wrapped on the outer side of the heating device 12.
In order to facilitate the connection and disconnection of the support rod 10 and the corrosion sample 11, the lower end of the support rod 10 is further provided with an internal threaded hole for forming a threaded connection relationship with the corrosion sample. Correspondingly, the upper end of the corrosion sample 11 is provided with an external thread column matched with the internal thread hole.
In order to visually reflect whether the weather environment in the glove box 15 satisfies the corrosion test requirements, the method is set as follows: and an oxygen analyzer and a water analyzer installed inside the glove box 15.
Example 3:
this example provides a specific test method based on example 1 or 2, including the following steps performed in sequence:
s1, completing the connection between the test section body 1 and the flange 2, the connection between the corrosion sample and the support rod 10 and the connection between the support rod 10 and the test section body 1;
s2, starting a main loop to carry out a corrosion test: introducing liquid lead or liquid lead bismuth alloy to the area where the corrosion sample is located through the inlet branch pipe to perform a corrosion test;
s3, after the corrosion test is finished, the corrosion sample is placed into the glove box 15 in a mode of lifting the corrosion sample, and before the corrosion sample is placed into the glove box 15, oxygen and water in the glove box 15 are removed through the gas purification system 17;
s4, separating the corrosion sample from the support rod 10 through the sampling operation window 14, then opening the inner side cabin door, transferring the corrosion sample from the glove box 15 to the transition cabin 16, and then closing the inner side cabin door;
and S5, taking out the corrosion sample from the device.
The foregoing is a more detailed description of the present invention in connection with specific preferred embodiments thereof, and it is not intended that the specific embodiments of the present invention be limited to these descriptions. For those skilled in the art to which the invention pertains, other embodiments that do not depart from the gist of the invention are intended to be within the scope of the invention.
Claims (10)
1. The corrosion test device for the liquid lead or the liquid lead-bismuth alloy is characterized by comprising a box body, wherein a box-shaped glove box (15) is arranged on the box body, the corrosion test device further comprises a flange (2) fixed on a bottom plate (9) of the glove box (15), a communication hole is formed in the bottom plate (9), and the communication hole is communicated with a central hole of the flange (2);
the test section comprises a test section body (1), wherein a straight tubular straight pipe section is arranged at the upper end of the test section body (1), the upper end of the straight pipe section is inserted into a glove box (15) through a communication hole, an inlet branch pipe used for introducing liquid lead or liquid lead-bismuth alloy into the straight pipe section is further arranged on the side surface of the straight pipe section, and the inlet branch pipe is positioned below a bottom plate (9);
the sealing device is used for sealing a gap between the straight pipe section and the flange (2), and the fixing device is used for fixing the straight pipe section on the flange (2);
the device is characterized by further comprising a seal head (6), a gland (5) and a support rod (10), wherein the upper end of the support rod (10) is fixed on the lower end face of the seal head (6), the seal head (6) is fixed at the upper end of the straight pipe section through the gland (5), the support rod (10) is embedded into the straight pipe section, and the lower end of the support rod (10) extends to the position below a connection point of the inlet branch pipe on the straight pipe section;
the glove box is characterized by further comprising a sampling operation window (14) and a transition cabin (16) which are arranged on the glove box (15), wherein the sampling operation window (14) comprises gloves and hand holes which are formed in the wall of the glove box (15), hand insertion ends of the gloves are connected with the hand holes, finger ends of the gloves are located inside the glove box (15), the transition cabin (16) comprises an inner side cabin door and an outer side cabin door, the inner side cabin door is used as a part of the wall of the glove box (15), and after the inner side cabin door and the outer side cabin door are closed, a closed cavity is formed inside the transition cabin (16);
after the test section body (1) is connected with the flange (2), the end socket (6) is connected with the test section body (1), and the inner side cabin door is closed, the glove box (15) is a closed cavity;
and a gas purification system (17) connected to the inner space of the glove box (15), wherein the gas purification system (17) is used for removing oxygen and water in the glove box (15).
2. The corrosion test device for liquid lead or liquid lead-bismuth alloy according to claim 1, further comprising a lifting device (13) arranged in the glove box (15), wherein the lifting device (13) is positioned right above the seal head (6), and the lifting device (13) is used for lifting and releasing the seal head (6).
3. The corrosion test device for liquid lead or liquid lead-bismuth alloy according to claim 1, characterized in that the sampling operation window (14) is arranged on the side of the glove box (15), the transition chamber (16) is arranged on the side of the glove box (15), and the sampling operation window (14) is arranged on a different side from the transition chamber (16).
4. The corrosion test device for liquid lead or liquid lead-bismuth alloy according to claim 1, wherein the gas purification system (17) comprises a deaerator, a water remover, an activated carbon filter and a circulating fan, wherein the inlet end and the outlet end of the circulating fan are connected with the inner space of the glove box (15) through pipelines, and the deaerator, the water remover and the activated carbon filter are connected in series on the pipelines.
5. The corrosion test device for liquid lead or liquid lead-bismuth alloy according to claim 1, wherein the pipe orifice of the inlet branch pipe is an inlet for introducing the liquid lead or liquid lead-bismuth alloy, the inlet is oriented in a direction perpendicular to the length direction of the straight pipe section, the lower end of the straight pipe section is also provided with a bent pipe section, the pipe orifice of the bent pipe section is an outlet for the liquid lead or liquid lead-bismuth alloy, the outlet is oriented in a direction perpendicular to the length direction of the straight pipe section, and the inlet is oriented in a direction opposite to the direction of the outlet;
the position of the corrosion sample (11) connected to the lower end of the support rod (10) is positioned between the connection point of the inlet branch pipe on the straight pipe section and the bending point of the straight pipe section.
6. The corrosion testing apparatus for liquid lead or liquid lead bismuth alloy according to claim 5, further comprising a heating device (12), wherein the heating device (12) is used for heating the pipe section between the inlet and the outlet.
7. The corrosion test device for liquid lead or liquid lead-bismuth alloy according to claim 6, wherein the heating device (12) is an electric heating wire wound on the corresponding pipe section, and further comprises an insulating layer wrapped outside the heating device (12).
8. The corrosion test device for liquid lead or liquid lead-bismuth alloy according to any one of claims 1 to 7, characterized in that the lower end of the support rod (10) is further provided with an internally threaded hole for forming a threaded connection with a corrosion coupon (11).
9. The apparatus for testing corrosion of liquid lead or liquid lead bismuth alloy according to any one of claims 1 to 7, further comprising an oxygen analyzer and a water analyzer installed inside the glove box (15).
10. A method for testing the corrosion of liquid lead or a liquid lead bismuth alloy, characterized in that it is a method for testing the device provided in any one of claims 1 to 9, comprising the following steps carried out in sequence:
s1, completing the connection between the test section body (1) and the flange (2), the connection between the corrosion sample (11) and the support rod (10), and the connection between the support rod (10) and the test section body (1);
s2, starting a main loop to carry out a corrosion test: introducing liquid lead or liquid lead-bismuth alloy to the area where the corrosion sample (11) is located through the inlet branch pipe to perform a corrosion test;
s3, after the corrosion test is finished, the corrosion sample (11) is placed into a glove box (15) in a mode of lifting the corrosion sample (11), and oxygen and water in the glove box (15) are removed through a gas purification system (17) before the corrosion sample (11) is placed into the glove box (15);
s4, separating the corrosion sample (11) from the support rod (10) through the sampling operation window, then opening the inner side cabin door, transferring the corrosion sample (11) from the glove box (15) to the transition cabin (16), and then closing the inner side cabin door;
s5, taking out the corrosion sample (11) from the device.
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| CN110307949B (en) * | 2019-05-17 | 2021-03-30 | 华北电力大学 | Labyrinth type sealing element hydraulic experiment bench |
| CN111398149B (en) * | 2020-04-30 | 2022-06-10 | 中国核动力研究设计院 | Static immersion test device and test method for liquid lead bismuth environment |
| CN112414927A (en) * | 2020-11-06 | 2021-02-26 | 中国科学院金属研究所 | Universal method for researching corrosion behavior of structural material in lead-bismuth alloy melt |
| CN114999692B (en) * | 2022-06-16 | 2024-05-28 | 中国核动力研究设计院 | Helium atmosphere maintaining device for high-temperature gas cooled reactor |
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