CN111426520A - Alkali metal sampling device - Google Patents
Alkali metal sampling device Download PDFInfo
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- CN111426520A CN111426520A CN202010302719.6A CN202010302719A CN111426520A CN 111426520 A CN111426520 A CN 111426520A CN 202010302719 A CN202010302719 A CN 202010302719A CN 111426520 A CN111426520 A CN 111426520A
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- alkali metal
- sampling
- metal sampling
- assembly
- sampling device
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/10—Devices for withdrawing samples in the liquid or fluent state
- G01N1/20—Devices for withdrawing samples in the liquid or fluent state for flowing or falling materials
- G01N1/2035—Devices for withdrawing samples in the liquid or fluent state for flowing or falling materials by deviating part of a fluid stream, e.g. by drawing-off or tapping
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/10—Devices for withdrawing samples in the liquid or fluent state
- G01N1/20—Devices for withdrawing samples in the liquid or fluent state for flowing or falling materials
- G01N1/2035—Devices for withdrawing samples in the liquid or fluent state for flowing or falling materials by deviating part of a fluid stream, e.g. by drawing-off or tapping
- G01N2001/205—Devices for withdrawing samples in the liquid or fluent state for flowing or falling materials by deviating part of a fluid stream, e.g. by drawing-off or tapping using a valve
Abstract
The invention provides an alkali metal sampling device which comprises an alkali metal sampling assembly, an operation box and an atmosphere adjusting assembly, wherein the alkali metal sampling assembly is in fluid communication with an alkali metal loop and used for extracting alkali metal from the alkali metal loop, the operation box is in sealed fit with the alkali metal sampling assembly and used for operating the alkali metal sampling assembly, and the atmosphere adjusting assembly is in fluid communication with an inner cavity of the alkali metal sampling assembly and used for providing a required internal atmosphere environment for the alkali metal sampling assembly. The alkali metal sampling assembly is directly connected to the alkali metal loop, so that online sampling of the alkali metal loop is realized, contact with air in the sampling process is avoided, a proper environment is provided for sampling of the alkali metal through the operation box hermetically matched with the alkali metal sampling assembly and the atmosphere adjusting assembly, contact of an alkali metal sample with the air is avoided in the whole process, the original property of the alkali metal is guaranteed as far as possible, and guarantee is provided for accuracy of subsequent tests or tests.
Description
Technical Field
The invention relates to a sampling device, in particular to a device for sampling alkali metal in a heat exchange loop or an experimental loop of a fast reactor.
Background
At present, materials such as alkali metal sodium, potassium, lithium, sodium-potassium alloy and the like are widely applied to the fields of chemical industry, fuel, metallurgy, pharmacy, nuclear energy and the like as heat transfer media. The presence of impurities in the alkali metal and the alloy affects the performance of the alloy, and particularly, the presence of impurities such as oxygen, carbon, calcium and the like in the alkali metal or the alloy affects the heat transfer performance of the material and also adversely affects the mechanical properties, service life, reliability and the like of relevant equipment using the material.
In practical applications, in order to study the properties of alkali metals and analyze the impurity concentration therein, the alkali metals used need to be sampled and analyzed. However, the chemical nature of alkali metals is extremely reactive and susceptible to reaction with water and oxygen in the air and/or on associated equipment and with the material of the sampling vessel itself, causing contamination of the collected sample. In addition, since the content of impurities in the alkali metal is generally in the order of μ g/g, very small contamination during sampling can cause great interference to the measurement result. In order to obtain a representative alkali metal sample and ensure that the sample is not polluted, certain sampling conditions need to be observed, for example, approximately the same working conditions as those of a sampling point of a main alkali metal heat exchange loop need to be established, and the error that impurities in the sampled sample may be redistributed is reduced to the minimum, namely, the impurities are prevented from being separated out or dissolved out on the pipe wall of a sampling container in the sampling process, and the sample is prevented from being polluted in the sampling preparation work, the sampling process and the transfer process.
At present, for example for the fast reactor of sodium-cooled fast reactor for example the sample operating mode that is the heat transfer circuit of a return circuit is more complicated, the effective useless sodium shutoff of the sampling tube of current portable sample container exposes in the air, in the useless sodium got into sample container very easily during the sample to because unable alkali metal that utilizes thoroughly erodees sample branch pipe and sample container, can pollute the sample during consequently the sample. In addition, the sampling device for the primary loop of the sodium-cooled fast reactor is used for sampling radioactive sodium in the primary loop of the sodium-cooled fast reactor, but the sampling device is complex in structure, large in equipment and not suitable for conventional alkali metal sampling.
The invention aims to provide a sampling device which can be used for sampling alkali metal in a fast reactor and can be used for sampling alkali metal under the general condition, and the sampling device can realize quick and convenient sampling under the condition of meeting the pollution-free sampling.
Disclosure of Invention
In order to solve at least one of the above technical problems, an embodiment of the present invention provides an alkali metal sampling device, which includes an alkali metal sampling assembly, an operation box and an atmosphere adjusting assembly, wherein the alkali metal sampling assembly is in fluid communication with an alkali metal loop for extracting alkali metal from the alkali metal loop, the operation box is in sealed cooperation with the alkali metal sampling assembly for operating the alkali metal sampling assembly, and the atmosphere adjusting assembly is in fluid communication with an inner cavity of the alkali metal sampling assembly for providing a required internal atmosphere environment for the alkali metal sampling assembly.
The alkali metal sampling device can be directly connected to the alkali metal loop through the alkali metal sampling assembly, so that online sampling of the alkali metal loop is achieved, contact with air in the sampling process is avoided, test or transfer related operation of alkali metal extracted from the alkali metal loop is achieved through the operation box hermetically matched with the alkali metal sampling assembly, the sealing performance in the transfer process is further guaranteed, a proper environment is provided for sampling of the alkali metal through the atmosphere adjusting assembly, therefore, contact of an alkali metal sample with the air is avoided in the whole process, original properties of the alkali metal are guaranteed as far as possible, and guarantee is provided for accuracy of subsequent test or testing.
According to a preferred embodiment of the alkali metal sampling device of the present invention, the alkali metal sampling assembly comprises a hermetic housing, an alkali metal inlet pipe and an alkali metal outlet pipe provided at the bottom of the hermetic housing, and a sampling vessel provided inside the hermetic housing, wherein the height of the alkali metal outlet pipe is higher than the height of the sampling inlet of the sampling vessel in the longitudinal direction of the hermetic housing.
In another preferred embodiment of the alkali metal sampling device according to the present invention, the sealing housing comprises a cylinder having an opening at an upper portion thereof and a sealing cap provided on the opening, the sealing cap being openable to remove the sampling vessel from the cylinder.
According to a further preferred embodiment of the alkali metal sampling device according to the invention, the alkali metal sampling assembly further comprises a baffle plate disposed above the sampling vessel within the sealed housing, the baffle plate being supported on the inner wall of the sealed housing by a first support flange disposed on the inner wall of the sealed housing and being connected to the sampling vessel by a connection piece.
In a further preferred embodiment of the alkali metal sampling device according to the invention, the alkali metal sampling assembly further comprises a spacer disposed within the sealing housing above the baffle, the spacer being supported on the inner wall of the sealing housing by a second support flange disposed on the inner wall of the sealing housing.
According to a further preferred embodiment of the alkali metal sampling device according to the present invention, the alkali metal sampling assembly further comprises a cooling member provided on the outer wall of the hermetic case at a position close to the spacer, the cooling member being connected to the cooling source through a fluid line.
In another preferred embodiment of the alkali metal sampling device according to the present invention, the alkali metal sampling assembly further comprises a liquid level gauge disposed on an outer wall of the sealed housing.
According to a further preferred embodiment of the alkali metal sampling device according to the present invention, the level gauge is connected in fluid communication to the interior of the hermetic shell by a first connecting tube located below the alkali metal outlet tube and a second connecting tube located above the alkali metal outlet tube.
In a further preferred embodiment of the alkali metal sampling assembly according to the invention, the alkali metal sampling assembly further comprises a pressure cell for measuring the pressure of the upper cavity within the sealed housing.
According to a further preferred embodiment of the alkali metal sampling device of the present invention, the alkali metal sampling assembly further comprises a temperature measurement component for measuring the temperature of the alkali metal within the sealed housing.
In another preferred embodiment of an alkali metal sampling device according to the present invention, the atmosphere conditioning assembly comprises a vacuum pump and an inert gas source connected in fluid communication with the lumen of the alkali metal sampling assembly.
According to a further preferred embodiment of the alkali metal sampling device according to the present invention, the vacuum pump and the inert gas source are connected to the inside of the operation chamber in fluid communication.
In a further preferred embodiment of the alkali metal sampling device according to the invention, the operation housing comprises a lifting mechanism arranged inside for lifting the sampled alkali metal from the alkali metal sampling assembly.
According to a further preferred embodiment of the alkali metal sampling device according to the invention, the operating box comprises a transition box body which is arranged at the side of the operating box and is sealingly connected to the operating box.
Compared with the prior art, the invention has at least one of the following beneficial effects:
(1) according to the alkali metal sampling device, the fluid dynamics and the temperature working condition which are basically the same as those of the sampling point of the alkali metal heat exchange main loop are established through the alkali metal sampling assembly, a proper sampling environment is provided for online sampling of alkali metal, so that a sampled product and the alkali metal in the heat exchange main loop have the completely same working condition state, and the sampling precision and the reliability are improved;
(2) the operation box in the inert gas environment provides safe environment guarantee for taking out the alkali metal from the sampling container and transferring the sample, and avoids any pollution to the alkali metal sample in the transferring process;
(3) the alkali metal sampling device has reasonable structural design, has the advantages of less contamination, more sampling amount, capability of sampling high-temperature samples, simple operation, safety, reliability and the like in the sampling process, can ensure that representative samples are obtained, and better solves the problem of sampling alkali metals.
Drawings
Other objects and advantages of the present invention will become apparent from the following description of the invention which refers to the accompanying drawings, and may assist in a comprehensive understanding of the invention.
Fig. 1 is an overall schematic view of an alkali metal sampling device according to an exemplary embodiment of the present invention.
Fig. 2 is an enlarged schematic view of an alkali metal sampling assembly of an alkali metal sampling device according to the present invention.
It is noted that the drawings are not necessarily to scale and are merely illustrative in nature and not intended to obscure the reader.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention. It should be apparent that the described embodiment is one embodiment of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs.
An alkali metal sampling device 10 is provided according to an embodiment of the present invention, and the alkali metal sampling device 10 can be used for obtaining a sample of an alkali metal for heat exchange from a heat exchange loop of a fast reactor so as to be used for alkali metal detection operation. The alkali metal sampling device 10 of the invention can realize the online sampling operation of the alkali metal by establishing the fluid dynamics and temperature working conditions which are basically the same as the sampling point of the alkali metal heat exchange main loop in the device and reasonably arranging the related sampling components and the structures thereof, thereby ensuring that the alkali metal is prevented from being polluted in the sampling process and having simple and convenient operation.
The structure of the alkali metal sampling device 10 according to the present invention will be described in detail with reference to fig. 1 and 2. An alkali metal sampling assembly 10 according to the present invention includes an alkali metal sampling assembly 12, a control box 14, and an atmosphere conditioning assembly 16, as shown in fig. 1, wherein the alkali metal sampling assembly 12 is capable of being in fluid communication with an alkali metal circuit such that liquid alkali metal in the alkali metal circuit flows into the alkali metal sampling assembly 12, i.e., the alkali metal sampling assembly 12 can be used to draw alkali metal from the alkali metal circuit. The enclosure 14 may provide a good environment for removing alkali metal from the alkali metal sampling assembly 12, while the atmosphere conditioning assembly 16 may provide a guarantee of the atmosphere and environment within the alkali metal sampling assembly 12 and the enclosure 14. The control box 14 is in this case sealingly engaged with the alkali metal sampling assembly 12, so that a sealed operating environment is ensured during operation of the alkali metal sampling assembly 12 in the control box 14, in order to prevent contamination of the collected alkali metal by air. The atmosphere conditioning assembly 16 is in fluid communication with the interior cavity of the alkali metal sampling assembly 12 and the interior cavity of the control box 14 for providing a desired internal atmosphere environment for the alkali metal sampling assembly 12 and the control box 14.
The alkali metal sampling assembly of the alkali metal sampling device 10 according to the present invention is described below with reference to fig. 2. The alkali metal sampling assembly 12 includes a sealed housing 122, an alkali metal inlet tube 124 and an alkali metal outlet tube 126 disposed at the bottom of the sealed housing 122, and a sampling vessel 128 disposed inside the sealed housing 122, where the alkali metal outlet tube 126 is located at a higher position than a sampling inlet of the sampling vessel 128. The sealed housing 122 provides a sealed space for the sampling process to prevent the alkali metal from being contaminated by air during the sampling process. The alkali metal inlet pipe 124 may be fluidly connected to the alkali metal circuit by a valve such that alkali metal can flow into the sealed housing 122, while the alkali metal outlet pipe 126 may also be fluidly connected to the alkali metal circuit by a valve, thereby creating a flow of alkali metal within the interior cavity of the sealed housing 122 to enable online sampling within the sealed housing 122 by the sampling vessel 128. Here, in order to facilitate the entry of the alkali metal into the sampling vessel 128, the position of the alkali metal outlet tube 126 on the hermetic shell 122 may be set to be higher than the height of the sampling inlet of the sampling vessel 128, thereby making it possible to fill the sampling vessel 128 with the liquid alkali metal entered into the hermetic shell 122 before it flows out of the hermetic shell 122. Of course, the height of the alkali metal inlet pipe 124 and the alkali metal outlet pipe 126 may be set to be higher than the height of the sampling inlet of the sampling vessel 128. Here, the sealing housing 122 is preferably made of stainless steel, such as a stainless steel cylinder, or other shapes are also possible, and the alkali metal inlet pipe 124, the alkali metal outlet pipe 126, and the sampling container 128 are also preferably made of stainless steel.
To facilitate removal of the sampling vessel 128 from within the seal housing 122 upon completion of sampling, the seal housing 122 may be configured to include a barrel 1222 having an opening at an upper portion thereof and a seal cap 1224 disposed over the opening, the seal cap 1224 being capable of being opened to remove the sampling vessel 128 from within the barrel 1222. Here, it is possible to provide the opening of the cylinder 1222 in a flange shape while providing the sealing cover 1224 in a flange-like cover matching therewith, and to seal the opening by providing a snap between the flange-shaped opening and the sealing cover 1224, thereby forming a sealed space inside the sealing case 122.
Alkali metal sampling assembly 12 of alkali metal sampling device 10 of the present invention further comprises a baffle 130 disposed within seal housing 122 above sampling vessel 128, baffle 130 being supportable on the inner wall of seal housing 122 by a first support flange 1226 disposed on the inner wall of seal housing 122 and connected to sampling vessel 128 by a connector 1302. Here, the barrier 130 may be provided to have a substantially umbrella shape, a coupling 1302 may be provided at a lower portion of the barrier 130 for coupling the sampling vessel 218 to the barrier 130, and a lifting portion 1304 may be provided at an upper portion of the barrier 130, and the barrier 130 may be lifted by the lifting portion 1304. The baffle 130 can form a substantially sealing surface above the liquid alkali metal for blocking the transfer of alkali metal aerosol and heat from the alkali metal to the upper cavity of the sealed housing 122 above the baffle 130.
Further, a spacer 132 is provided in the hermetic case 122 above the baffle 130, and the spacer 132 is supported on the inner wall of the hermetic case 122 by a second support flange 1228 provided on the inner wall of the hermetic case 122. The shape of the partition 132 substantially matches the shape of the inner cavity of the seal housing 122, so that the partition 132 substantially occupies the circumferential space of the seal housing 122, and the partition 132 may be provided to have a certain thickness along the axial direction of the seal housing 122, thereby enabling better heat insulation and alkali metal aerosol isolation. The partition 132 may be made of an insulating material, and further includes a lifting portion 1322 provided at an upper portion, and the partition 132 may be removed from the hermetic case 122 by holding the lifting portion 1322. Thus, the baffle 130 and the spacer 132 separate the inner space of the hermetic shell 122, which not only prevents heat transfer between the upper cavity above the spacer 132 and the sampling cavity below the baffle 130, but also prevents the alkali aerosol in the sampling cavity from entering the upper cavity of the hermetic shell 122.
In order to prevent a large amount of aerosol from being generated at the partition 132, a cooling member 134 on an outer wall of the hermetic case 122 may be provided at a position near the partition 132, and the cooling member 134 is connected to the cold source 1344 through a fluid line 1342. The cold source 1344 may be a refrigeration device commonly used in the art that is in fluid communication with the cooling member 134 via two lines, thereby circulating a cooling medium between the cold source 1344 and the cooling member 134.
The alkali metal sampling assembly 12 of the alkali metal sampling assembly 10 of the present invention may further comprise a level gauge 136 disposed on an outer wall of the sealed housing 12. The level gauge 136 may be used to measure the hydraulic pressure of the liquid alkali metal within the sampling cavity within the sealed housing 122, thereby enabling the level of the liquid alkali metal to be determined, and also enabling the gas pressure within the sampling cavity to be measured. The fluid level gauge 136 is connected in fluid communication to the sampling lumen of the sealed housing 122 by a first connecting tube 1362 located below the alkali metal outlet tube 126 and a second connecting tube 1364 located above the alkali metal outlet tube 126. That is, in the height direction of the alkali metal sampling assembly 12, the height of the alkali metal outlet tube 126 is higher than the height of the first connecting tube 1362 and lower than the height of the second connecting tube 1364. The measured level point of the level gauge 136 is located above the alkali metal outlet tube 126 so that the level gauge 136 can signal when the liquid level within the sampling cavity in the sealed housing 122 exceeds the measured level point. The level of liquid measured by the level gauge 136 may be displayed by a display on the console box and when the level gauge 136 signals, an alarm signal may be provided by the display or another alarm device.
Heating means may be provided on the outer wall of the bottom of the barrel 1222 of the alkali metal sampling assembly 12 to heat the barrel 1222 to ensure that the alkali metal entering the sampling vessel 128 of the alkali metal sampling assembly 12 is in a liquid state and maintains as consistent a condition as possible with the alkali metal circuit. Here, a heating wire may be wound around an outer wall of the bottom of the cylinder 1222, so that the cylinder 1222 is heated. In addition, in order to accurately know the temperature in the sampling cavity of the cartridge 1222, a temperature measuring part 1230 is provided on the sidewall of the cartridge 1222, and the temperature measuring part 1230 may be a thermocouple. Notably, the thermometric component 1230 may be used to measure the temperature of the alkali metal within the sealed housing 122.
The alkali sampling assembly 12 of the alkali sampling device 10 according to the present invention may further include a pressure measuring component 1232 for measuring the pressure within the upper cavity within the sealed housing 122. The pressure measurement unit 1232 may measure whether the pressure within the upper cavity within the sealed housing 122 has changed when the sealing cap 1224 is opened. Similarly, a temperature measuring part, such as a temperature thermocouple 1234, for measuring the temperature of the upper cavity of the hermetic case 122 may also be provided.
The atmosphere conditioning assembly 16 of an alkali metal sampling assembly 10 according to the present disclosure may include a vacuum pump 162 and an inert gas source 164 in fluid communication with the lumen of the alkali metal sampling assembly 12. The vacuum pump 162 may be used to evacuate the interior cavity of the alkali metal sampling assembly 12 to ensure that the interior has a sufficiently low oxygen concentration to prevent chemical reaction between the alkali metal and oxygen, and to fill the interior cavity of the alkali metal sampling assembly 12 with an inert gas via the inert gas source 164 to provide a good exterior environment for access to the alkali metal. In addition, in order to satisfy the requirement of environmental cleaning of the operation box 14, the vacuum pump 162 and the inert gas source 164 may be fluidly connected to the inside of the operation box 14, so that the inside of the operation box 14 may be evacuated by the vacuum pump 162, and the inside of the operation box 14 may be filled with an inert gas by the inert gas source 164, where the inert gas may be argon, thereby providing a friendly working environment for extraction of the alkali metal.
Here, vacuum pump 162 and inert gas source 164 may be fluidly connected to alkali metal sampling assembly 12 and process chamber 14 by communication lines, such as, as shown in FIG. 1, a single line may be used for both evacuating from alkali metal sampling assembly 12 and process chamber 14 and filling alkali metal sampling assembly 12 with inert gas, and a separate line may be used for filling process chamber 14 with inert gas. A first valve 1622 may be disposed at the exhaust port of the vacuum pump 162 for on-off controlling the exhaust line of the vacuum pump 162, one side of the first valve 1622 facing away from the vacuum pump 162 may divide the line into two paths, one path leading to the alkali metal sampling assembly 12 and the other path leading to the operation box 14, and a second valve 1624 and a third valve 1626 may be disposed on the line leading to the alkali metal sampling assembly 12 and the operation box 14, respectively. Thus, a vacuum may be drawn on the alkali metal sampling assembly 12 by opening the first and second valves 1622, 1624, and on the operator pod 14 by opening the first and third valves 1622, 1626.
Further, to save piping, an inert gas source 164 is also connected to the piping leading to the alkali metal sampling assembly 12 through a fourth valve 1642, whereby the alkali metal sampling assembly 12 can be filled with inert gas by opening the fourth valve 1642 and the second valve 1624 with the first valve 1622 and the third valve 1626 closed. In order to measure the pressure of the inert gas filling the alkali metal sampling assembly 12, a pressure measuring unit 1644, which may be a pressure gauge, for example, is provided at the outlet position of the fourth valve 1642.
In order to fill the operation box 14 with the inert gas having a relatively low pressure, a line is branched from the line between the inert gas source 164 and the fourth valve 1642, and is connected to the operation box 14 in fluid communication, and a pressure reducing valve 1646 is provided in the line leading from the inert gas source 164 to the operation box 14, and the output gas of the inert gas source 164 is depressurized by the pressure reducing valve 1646 and then filled into the operation box 14.
The enclosure 14 of the alkali metal sampling device 10 according to the present invention may further include an internally disposed lifting mechanism 142, the lifting mechanism 142 being configured to lift the sampled alkali metal from the alkali metal sampling assembly 12. Here, the partition 132 and the baffle 130 may be lifted from the cylinder 1222 after opening the sealing cover 1224 of the sealing case 122, respectively, and the sampling vessel 128 may be simultaneously extracted during the lifting of the baffle 130, thereby extracting the liquid alkali metal contained in the sampling vessel 128. In the process, the internal sample container 128 or the like can be handled via a handling opening 148 provided in the side wall of the handling box 14, wherein advantageously two handling openings 148 are provided.
The control box 14 may further include a transition box disposed at a side of the control box 14 and hermetically connected to the control box 14. in the embodiment shown in fig. 1, two transition boxes are provided, a first transition box 144 having a larger volume and a second transition box 146 having a smaller volume, respectively, and the transition boxes may be used for transferring the sampled alkali metal, and the alkali metal can be transported to other test boxes or laboratories through the transition boxes.
The operation of the alkali metal sampling device 10 according to the present invention will be briefly described below. When it is desired to sample alkali metal from the alkali metal circuit of the fast reactor, a complete set of alkali metal sampling apparatus 10 is first prepared with sealing cap 1224 of alkali metal sampling assembly 12 in a tightly sealed condition and with the various valves of atmosphere control assembly 16 of alkali metal sampling apparatus 10 in a closed condition. Next, the alkali metal inlet pipe 124 and the alkali metal outlet pipe 126 of the alkali metal sampling device 10 according to the present invention are connected to the upstream and downstream of the alkali metal circuit, respectively, where the upstream and downstream are only the positional relationship with respect to the flow direction of the alkali metal, and the absolute positions of the alkali metal inlet pipe 124 and the alkali metal outlet pipe 126 and the alkali metal circuit are not limited herein. At this time, the valves between the alkali metal inlet pipe 124 and the alkali metal outlet pipe 126 and the alkali metal circuit are in a closed state.
The process chamber 14 and the alkali metal sampling assembly 12 may then be provided with an atmosphere and environment suitable for operation by a vacuum pump 162 and an inert gas source 164, respectively. For example, the process chamber 14 may be first evacuated, which may involve opening the first valve 1622 and the third valve 1626, activating the vacuum pump 162, measuring the vacuum level in the process chamber 14 with a pressure gauge disposed in the process chamber 14 until the desired vacuum level is reached, and shutting down the vacuum pump 162. First valve 1622 may then be closed and process chamber 14 filled with inert gas by opening inert gas source 164 and pressure relief valve 1646. Here, after the operation box 14 is filled with the inert gas for a certain time, the inert gas source 164 and the pressure reducing valve 1646 may be closed, the first valve 1622 may be opened again to continue to vacuumize the operation box 14, and then the inert gas may be filled again, and the above operations may be repeatedly performed as needed, so as to ensure that the oxygen concentration in the operation box 14 is less than a certain value, so as to meet the operation requirement. Of course, the inside of the operation box 14 may be subjected to the circulation cleaning process by the circulation cleaner attached to the operation box 14 itself so that the inside of the operation box 14 satisfies the required operation conditions.
The alkali metal sampling assembly 12 may then be evacuated and filled with an inert gas. After the process chamber 14 is evacuated and filled with inert gas, each valve is closed. At this time, the first valve 1622 and the second valve 1624 are opened and the vacuum pump 162 is started, so that the vacuum pumping process of the internal cavity of the alkali metal sampling assembly 12 can be realized, and after a certain vacuum degree is reached, the vacuum pump 162 may be first turned off, the first valve 1622 is turned off, then the fourth valve 1642 is turned on, and the inert gas source 164 is turned on, so as to fill the internal cavity of the alkali metal sampling assembly 12 with inert gas. Similar to evacuating and filling the enclosure 14 with an inert gas, the internal cavity of the alkali metal sampling assembly 12 may be evacuated and filled with an inert gas for a plurality of cycles to reduce the oxygen concentration in the internal cavity of the alkali metal sampling assembly 12 to a value to meet operational requirements. To test the tightness of the alkali metal sampling assembly 12, the internal cavity of the alkali metal sampling assembly 12 may be filled with an inert gas and then subjected to a pressure holding process, where the pressure holding process may be determined according to actual requirements, such as tens of minutes or hours.
The vacuum or pressure within the alkali metal sampling assembly 12 may be measured using a pressure measurement component 1232, such as a pressure gauge. The sealing state of the alkali metal sampling assembly 12 can be judged by observing the pressure measured by the pressure measuring unit 1232 over a certain period of time. After the sealing state has reached the relevant requirements, sampling of the alkali metal can be carried out with the alkali metal sampling device 10 according to the invention.
Next, cooling member 134 disposed on the outer wall of sealed housing 122 may be opened to cool the space of alkali metal sampling assembly 12 around spacer 132. Upon activation of the cold source 1344, a cooling medium within the cold source 1344 may circulate between the cold source 1344 and the cooling member 134 via the fluid line 1342, thereby providing a cooling medium for cooling the outer wall of the sealed housing 122. Likewise, the temperature of the upper cavity within alkali metal sampling assembly 12 between spacer 132 and sealing cap 1224 may be measured using a temperature measuring device such as thermocouple 1234. At the same time, a heating wire wound around the outer wall of the bottom of the cylinder 1222 of the sealing case 122 is energized to heat the bottom of the cylinder 1222, and the temperature of the bottom cavity of the cylinder 1222 is measured, where the upper cavity and the sampling cavity are thermally insulated by the barrier 130 and the partition 132. When the temperature measured by the temperature measuring device reaches the desired temperature, the valves on the alkali metal inlet tube 124 and the alkali metal outlet tube 126 are opened, so that the alkali metal flows into the sampling cavity of the cylinder 1222 of the sealed housing 122 and into the sampling vessel 128. Here, the gaseous alkali metal located near the partition 132 may be cooled by the cooling member 134 to condense the gaseous alkali metal therein, thereby preventing the gaseous alkali metal from continuing to rise into the upper cavity of the hermetic case 122. In addition, the cooling part 134 may prevent the formation of alkali metal aerosol by condensation of alkali metal.
Subsequently, the valves on the alkali metal inlet tube 124 and the alkali metal outlet tube 126 may be closed, and then the second valve 1624 and the third valve 1626 may be opened, thereby placing the upper cavity of the alkali metal sampling assembly 12 in fluid communication with the interior cavity of the cabinet 14, and correspondingly releasing the inert gas within the upper cavity of the alkali metal sampling assembly 12 into the cabinet 14, thereby providing the same operating environment within the alkali metal sampling assembly 12 and the cabinet 14. At this time, the sealing cover 1224 may be opened in the operation box 14, the partition 132 may be lifted by the lifting mechanism 142, for example, the lifting portion 1322 of the partition 132 may be gripped by the lifting mechanism 142, and the partition 132 may be lifted by lifting the lifting portion 1322 and placed in the operation box 14. Then, when the lifting mechanism 142 is used to hold the lifting part 1304 of the shutter 130 and lift the shutter 130, the sampling vessel 128 is lifted into the operation box 14 together with the shutter 130 since the sampling vessel 128 is connected to the shutter 130 by the connection member 1302. The alkali metal sample in the sampling vessel 128 may then be subjected to a related test or transferred to another testing device. Here, the alkali metal sample in the sampling vessel 128 may be transferred to another testing apparatus through the first transition box 144 or the second transition box 146 for subsequent testing. After the alkali metal in sampling vessel 128 has been removed, sampling vessel 128 may be replaced in cabinet 14, sampling vessel 128 may then be installed to the lower portion of connector 1302 of baffle plate 130, baffle plate 130 may be placed in barrel 1222 of sealed housing 122 of alkali metal sampling assembly 12 using lifting mechanism 142, spacer 132 may then be placed in barrel 1222 via lifting mechanism 142, and sealing cap 1224 may be sealingly disposed on barrel 1222 for the next sampling.
According to the alkali metal sampling device 10, the alkali metal sampling assembly 12 establishes the fluid dynamics and temperature working conditions which are basically the same as those of the sampling point of the alkali metal heat exchange main loop, a proper sampling environment is provided for online sampling of the alkali metal, the sampled product and the alkali metal in the heat exchange main loop have the completely same working condition state, and therefore sampling precision and reliability are improved. Further, the operation box 14 using the inert gas environment provides a safe environmental guarantee for the extraction of the alkali metal from the sampling container 128 and the transfer of the sample, and avoids any contamination of the alkali metal sample during the transfer process. Therefore, the alkali metal sampling device has reasonable structural design, has the advantages of less contamination, more sampling amount, capability of sampling high-temperature samples, simple operation, safety, reliability and the like in the sampling process, can ensure that representative samples are obtained, and better solves the problem of sampling alkali metals.
It should also be noted that, in the case of the embodiments of the present invention, features of the embodiments and examples may be combined with each other to obtain a new embodiment without conflict.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and the scope of the present invention is subject to the scope of the claims.
Claims (14)
1. An alkali metal sampling device, comprising:
an alkali metal sampling assembly in fluid communication with an alkali metal circuit for extracting alkali metal from the alkali metal circuit;
an operation box hermetically matched with the alkali metal sampling assembly and used for operating the alkali metal sampling assembly; and
an atmosphere conditioning assembly in fluid communication with the inner cavity of the alkali metal sampling assembly for providing a desired internal atmosphere environment for the alkali metal sampling assembly.
2. Alkali metal sampling device according to claim 1, characterized in that:
the alkali metal sampling assembly comprises a sealing shell, an alkali metal inlet pipe and an alkali metal outlet pipe which are arranged at the bottom of the sealing shell, and a sampling container arranged inside the sealing shell, wherein the height of the alkali metal outlet pipe is higher than that of a sampling inlet of the sampling container in the longitudinal direction of the sealing shell.
3. Alkali metal sampling device according to claim 2, wherein:
the sealing shell comprises a cylinder body with an opening at the upper part and a sealing cover arranged on the opening, and the sealing cover can be opened so as to take out the sampling container from the cylinder body.
4. Alkali metal sampling device according to claim 2, wherein:
the alkali metal sampling assembly further comprises a baffle disposed within the seal housing above the sampling vessel, the baffle supported on the inner wall of the seal housing by a first support flange disposed on the inner wall of the seal housing and connected to the sampling vessel by a connector.
5. Alkali metal sampling device according to claim 4, wherein:
the alkali metal sampling assembly further includes a spacer disposed within the sealed housing above the baffle, the spacer supported on the inner wall of the sealed housing by a second support flange disposed on the inner wall of the sealed housing.
6. Alkali metal sampling device according to claim 5, wherein:
the alkali metal sampling assembly further includes a cooling member disposed on an outer wall of the sealed housing at a position near the spacer, the cooling member being connected to a cold source through a fluid line.
7. Alkali metal sampling device according to claim 2, wherein:
the alkali metal sampling assembly further comprises a liquid level gauge disposed on an outer wall of the sealed housing.
8. Alkali metal sampling device according to claim 7, wherein:
the liquid level gauge is connected to the interior of the hermetic shell in fluid communication by a first connecting tube located below the alkali metal outlet tube and a second connecting tube located above the alkali metal outlet tube.
9. Alkali metal sampling device according to claim 2, wherein:
the alkali metal sampling assembly further includes a load cell for measuring pressure of an upper cavity within the sealed housing.
10. Alkali metal sampling device according to claim 2, wherein:
the alkali metal sampling assembly further comprises a temperature measurement component for measuring the temperature of the alkali metal in the sealed housing.
11. Alkali metal sampling device according to claim 1, characterized in that:
the atmosphere conditioning assembly includes a vacuum pump and an inert gas source connected in fluid communication with the inner lumen of the alkali metal sampling assembly.
12. Alkali metal sampling device according to claim 11, wherein:
the vacuum pump and the inert gas source are connected in fluid communication to an interior of the process chamber.
13. Alkali metal sampling device according to claim 1, characterized in that:
the handle box includes an internally disposed lifting mechanism for lifting the sampled alkali metal from the alkali metal sampling assembly.
14. Alkali metal sampling device according to claim 1, characterized in that:
the operation box comprises a transition box body which is arranged on the side surface of the operation box and is connected with the operation box in a sealing mode.
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