CN115116636A - High-temperature gas cooled reactor graphite dust trapping optimization method and system - Google Patents
High-temperature gas cooled reactor graphite dust trapping optimization method and system Download PDFInfo
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Abstract
The method comprises the steps of obtaining the initial particle deposition rate of a charging and refueling loop of the high-temperature gas cooled reactor, determining an easily deposited area based on the initial particle deposition rate, and additionally installing a first ultrasonic generator on the outer wall of a pipeline of the easily deposited area; a second ultrasonic generator is additionally arranged on the outer wall of an upstream pipeline close to a dust filter of the high-temperature gas cooled reactor; operating the first ultrasonic generator according to a set period, and continuously operating the second ultrasonic generator; and obtaining a particle deposition rate change value of the graphite dust in the easy deposition area, and adjusting the positions and working parameters of the first ultrasonic generator and the second ultrasonic generator based on the particle deposition rate change value. According to the method disclosed by the invention, the high-temperature gas cooled reactor graphite dust collecting efficiency can be improved.
Description
Technical Field
The disclosure relates to the technical field of high-temperature gas cooled reactor graphite dust capture, in particular to a high-temperature gas cooled reactor graphite dust capture optimization method and system.
Background
The high-temperature gas cooled reactor is a reactor taking graphite as a moderator and helium as a coolant, is an advanced fourth-generation nuclear reactor type technology, has the advantages of good safety, high power generation efficiency, good economy, extremely wide application and the like, can replace the traditional fossil energy, and realizes the coordinated development of economic and ecological environments.
During the operation of the reactor, hundreds of thousands of fuel balls are loaded in the reactor core, and the fuel balls are added into the reactor core of the reactor through the reactor top feeding pipe and flow out through the reactor bottom discharging pipe. However, the fuel balls are subjected to frictional wear with the fuel balls, graphite reactor internals, fuel handling system pipelines and equipment during the circulation process, and graphite dust is generated. The circulation of fuel balls can be influenced along with the accumulation of graphite dust in a return circuit, radioactive hot spots can be formed locally, inconvenience is brought to the maintenance and overhaul of equipment, and radioactive pollution caused by leakage of the graphite dust into the environment through a pipeline break in an accident situation is also a very concerned problem in modern nuclear safety design.
For removing graphite dust, CO and CO in high-temperature gas cooled reactor 2 、H 2 And gas impurities are waited, and a helium purification system is designed in the prior art. In the helium gas purification system, the dust was filtered using a tubular dust filter to remove 1 μm in diameterThe solid particles of (a). However, the research of the German AVR test pebble bed type high-temperature gas cooled reactor shows that most of the graphite dust is deposited in the reactor core and the refueling loop, and only a small part of the graphite dust enters the helium purification loop. Most of the graphite dust is carried by helium coolant, and gradually deposits and adheres to the surface of a primary circuit and a flow dead zone. Furthermore, the investigation of the AVR test stack also revealed that the graphite dust has a diameter of mostly less than 1 μm and a median diameter of 0.76 μm, resulting in a decrease in the filtration efficiency of the dust filter. Therefore, the graphite dust capture efficiency of the existing high-temperature gas cooled reactor needs to be improved.
Disclosure of Invention
The present disclosure is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, a first objective of the present disclosure is to provide an optimization method for capturing graphite dust in a high temperature gas cooled reactor, so as to improve the capturing efficiency of graphite dust in the high temperature gas cooled reactor.
The second purpose of the present disclosure is to provide a high temperature gas cooled reactor graphite dust capture optimization system.
In order to achieve the above purpose, an embodiment of the first aspect of the present disclosure provides a method for optimizing graphite dust capture in a high temperature gas cooled reactor, including:
obtaining the initial particle deposition rate of a loading and refueling loop of the high-temperature gas cooled reactor, determining an easily deposited area based on the initial particle deposition rate, and additionally installing a first ultrasonic generator on the outer wall of a pipeline of the easily deposited area;
a second ultrasonic generator is additionally arranged on the outer wall of an upstream pipeline close to a dust filter of the high-temperature gas cooled reactor;
operating the first ultrasonic generator according to a set period, and continuously operating the second ultrasonic generator;
and obtaining a particle deposition rate change value of the graphite dust in the deposition-prone area, and adjusting the positions and working parameters of the first ultrasonic generator and the second ultrasonic generator based on the particle deposition rate change value.
In one embodiment of the present disclosure, the obtaining an initial particle deposition rate of a refueling circuit of a high temperature gas cooled reactor, and determining a deposition prone area based on the initial particle deposition rate, includes: selecting a typical part of a charging and refueling loop of a high-temperature gas cooled reactor aiming at graphite dust, wherein the typical part comprises a plurality of areas; obtaining the initial particle deposition rate of the typical part under the coupling action of a plurality of deposition mechanisms; the initial particle deposition rates are arranged in a descending order, and the initial particle deposition rates with preset number are selected in sequence; and taking the area corresponding to the deposition rate of the initial particles with the preset number as an easy deposition area.
In one embodiment of the present disclosure, the operating the first ultrasonic generator according to a set cycle includes: and dividing a set period into an operation period and a stop period, starting the first ultrasonic generator in the operation period, and stopping the first ultrasonic generator in the stop period.
In an embodiment of the present disclosure, the first ultrasonic generator or the second ultrasonic generator respectively includes a plurality of ultrasonic generators, and when the first ultrasonic generator or the second ultrasonic generator is additionally installed, the ultrasonic generators are uniformly arranged according to a preset included angle.
In one embodiment of the disclosure, a deposition trend of graphite dust in the deposition-prone region is obtained, and the positions and operating parameters of the first ultrasonic generator and the second ultrasonic generator are adjusted based on the deposition trend and the particle deposition rate change value.
In one embodiment of the present disclosure, a graphite dust sample is obtained after the first ultrasonic generator and the second ultrasonic generator are operated, a particle size distribution measurement is performed on the graphite dust sample, and the initial particle deposition rate is corrected based on the measurement result.
In order to achieve the above object, a second aspect of the present disclosure provides a system for capturing and optimizing graphite dust in a high temperature gas cooled reactor, including:
the ultrasonic generator module comprises a first ultrasonic generator and a second ultrasonic generator, wherein the first ultrasonic generator is additionally arranged on the outer wall of the pipeline of the easy deposition area, and the second ultrasonic generator is additionally arranged on the outer wall of the upstream pipeline of the dust filter close to the high-temperature gas cooled reactor;
the control module is used for controlling the first ultrasonic generator to operate according to a set period and continuously controlling the second ultrasonic generator to operate;
the processing module is used for obtaining the initial particle deposition rate of a loading and refueling loop of the high-temperature gas cooled reactor before the ultrasonic generator module is installed, determining an easily-deposited area based on the initial particle deposition rate, obtaining the particle deposition rate change value of graphite dust in the easily-deposited area after the ultrasonic generator module is installed, and adjusting the positions and working parameters of the first ultrasonic generator and the second ultrasonic generator based on the particle deposition rate change value.
In an embodiment of the present disclosure, before the ultrasonic generator module is installed, the processing module is specifically configured to: selecting a typical part of a charging and refueling loop of a high-temperature gas cooled reactor aiming at graphite dust, wherein the typical part comprises a plurality of areas; obtaining the initial particle deposition rate of the typical part under the coupling action of a plurality of deposition mechanisms; arranging the initial particle deposition rates in a descending order, and sequentially selecting a preset number of initial particle deposition rates; and taking the area corresponding to the deposition rate of the initial particles with the preset number as an easy deposition area.
In an embodiment of the present disclosure, the control module, when being configured to control the operation of the first ultrasonic generator according to a set period, is specifically configured to; and dividing a set period into an operation period and a stop period, starting the first ultrasonic generator in the operation period, and stopping the first ultrasonic generator in the stop period.
In an embodiment of the disclosure, the processing module is further configured to obtain a deposition tendency of the graphite dust in the deposition-prone region, and adjust the positions and operating parameters of the first ultrasonic generator and the second ultrasonic generator based on the deposition tendency and the particle deposition rate variation value.
In one or more embodiments of the disclosure, obtaining an initial particle deposition rate of a charging and refueling loop of a high-temperature gas-cooled reactor, determining an easy deposition area based on the initial particle deposition rate, and additionally installing a first ultrasonic generator on the outer wall of a pipeline of the easy deposition area; a second ultrasonic generator is additionally arranged on the outer wall of an upstream pipeline close to a dust filter of the high-temperature gas cooled reactor; operating the first ultrasonic generator according to a set period, and continuously operating the second ultrasonic generator; and obtaining a particle deposition rate change value of the graphite dust in the easy deposition area, and adjusting the positions and working parameters of the first ultrasonic generator and the second ultrasonic generator based on the particle deposition rate change value. Under the condition, the binding force between the deposited graphite dust and the metal pipe wall is damaged by the first running ultrasonic generator, so that the graphite dust falls off and enters the material loading and changing loop again, the micro-particle coagulation effect is generated by the second running ultrasonic generator, the diameter of the graphite dust at the inlet of the dust filter is increased, the deposition amount of the graphite dust in the material loading and changing loop is reduced, and the graphite dust collecting efficiency of the high-temperature gas cooled reactor is improved.
Additional aspects and advantages of the disclosure will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the disclosure.
Drawings
In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative efforts. The foregoing and/or additional aspects and advantages of the present disclosure will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic flow chart of a method for capturing and optimizing graphite dust in a high temperature gas cooled reactor according to an embodiment of the present disclosure;
fig. 2 is a schematic flowchart of a method for determining an easy deposition area according to an embodiment of the disclosure;
FIG. 3 is a schematic diagram of an arrangement of ultrasonic generators on the outer wall of a pipeline provided by the embodiment of the disclosure;
fig. 4 is a block diagram of a high temperature gas cooled reactor graphite dust capture optimization system according to an embodiment of the present disclosure.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. The following description refers to the accompanying drawings in which the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with embodiments of the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the disclosed embodiments, as detailed in the appended claims.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present disclosure, "a plurality" means at least two, e.g., two, three, etc., unless explicitly specifically limited otherwise. It should also be understood that the term "and/or" as used in this disclosure refers to and encompasses any and all possible combinations of one or more of the associated listed items.
Reference will now be made in detail to the embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and intended to be illustrative of the present disclosure, and should not be construed as limiting the present disclosure.
The invention provides a method and a system for trapping and optimizing high-temperature gas cooled reactor graphite dust, and mainly aims to improve the trapping efficiency of the high-temperature gas cooled reactor graphite dust by arranging an ultrasonic generator at a specific position.
In a first embodiment, fig. 1 is a schematic flow chart of a method for optimizing capture of graphite dust in a high temperature gas cooled reactor according to an embodiment of the present disclosure. As shown in fig. 1, the method for optimizing the capture of graphite dust by high temperature gas cooled reactor comprises the following steps:
and step S11, obtaining the initial particle deposition rate of the charging and refueling loop of the high-temperature gas cooled reactor, determining an easily-deposited area based on the initial particle deposition rate, and additionally installing a first ultrasonic generator on the outer wall of the pipeline of the easily-deposited area.
In the present embodiment, the initial particle deposition rate in step S11 is the particle deposition rate before the ultrasonic generators (the first ultrasonic generator and the second ultrasonic generator) are attached or before the attached ultrasonic generators are operated.
In some embodiments, the initial particle deposition rate in step S11 may be a particle deposition rate for graphite dust having a particle diameter of 0.1 to 10 μm.
In some embodiments, the initial particle deposition rate in step S11 may be calculated based on various deposition mechanisms, particle sizes, and the like. If a change in conditions such as particle size is observed, the initial particle deposition rate needs to be recalculated.
Fig. 2 is a schematic flow chart of a method for determining an easy deposition area according to an embodiment of the disclosure. In some embodiments, the obtaining of the initial particle deposition rate of the charging and refueling circuit of the high temperature gas cooled reactor in step S11 determines the deposition prone region based on the initial particle deposition rate, as shown in fig. 2, specifically includes: selecting a typical part of a charging and refueling loop of the high-temperature gas cooled reactor aiming at the graphite dust, wherein the typical part comprises a plurality of areas (step S111); obtaining the initial particle deposition rate of the typical part under the coupling action of a plurality of deposition mechanisms (step S112); arranging the initial particle deposition rates in a descending order, and sequentially selecting a preset number of initial particle deposition rates (step S113); the region corresponding to the predetermined number of initial particle deposition rates is set as the deposition facilitating region (step S114).
In some embodiments, the refueling circuit in step S111 is, for example, a helium circuit.
In some embodiments, the typical locations in step S111 are, for example, typical areas of the charging loop, such as upstream and downstream of the ball-crushing separation device, upstream and downstream of the choke, and the lowest end of the loop.
In some embodiments, the multiple deposition mechanisms in step S112 are, for example, thermophoretic deposition, turbulent deposition, etc., and the initial particle deposition rate under the coupled action of the multiple mechanisms of thermophoretic deposition, turbulent deposition, etc. is calculated.
In some embodiments, the preset number in step S113 may be 3, for example, that is, the initial particle deposition rate of the first 3 bits in the descending sequence is selected. The region corresponding to the deposition rate of the first 3 initial particles may be referred to as a deposition-prone region.
In other embodiments, after the deposition-prone region is obtained, the deposition-prone region can be adjusted by combining experience feedback and actual operation conditions at home and abroad, and then a more accurate deposition-prone part can be obtained.
In other embodiments, after obtaining the deposition-prone region, the feasibility of the placement of the sonotrode and the environmental dosage conditions may be verified in the field for the identified deposition-prone region, and the appropriate location in the deposition-prone region to install the first sonotrode may be determined.
In this embodiment, the step S11 includes installing a first ultrasonic generator on the outer wall of the pipe in the easy deposition area, specifically, installing a first ultrasonic generator on the outer wall of the pipe in the accessible portion of the easy deposition area. Where the pipeline outer wall of the accessible portion may refer to a location that is spatially accessible to personnel or equipment, and the environmental dose rate during overhaul is assessed to allow access to personnel or equipment.
In the present embodiment, the first ultrasonic generator in step S11 is a generic term for the ultrasonic generator attached to the outer wall of the pipe in the deposition-prone region.
In step S11, the first ultrasonic generator includes a plurality of ultrasonic generators, and when the first ultrasonic generator is attached, the ultrasonic generators are uniformly arranged at a predetermined included angle. Wherein the preset included angle is the included angle of the adjacent ultrasonic generators. The preset included angle is, for example, one of 180 °, 120 ° and 90 °, that is, when the first ultrasonic generator is additionally installed, the ultrasonic generators are uniformly arranged on the outer wall of the pipeline at intervals of 180 °, 120 ° or 90 °.
In some embodiments, typical positions of an upstream and a downstream of a charging and refueling loop ball-crushing separation device, an upstream and a downstream of a flow damper, a lowest end of a loop and the like are selected for graphite dust with particle size of 0.1-10 μm, initial particle deposition rate under coupling action of multiple mechanisms such as thermophoretic deposition and turbulent deposition is analyzed, a position 3 before the initial particle deposition rate is selected as an easy deposition area, and meanwhile, the easy deposition position can be adjusted by combining operation experience feedback and actual operation conditions of high-temperature gas cooled reactors in foreign countries such as Germany, America and the like. The feasibility of the sonotrode arrangement was verified in the field for the identified sites, as well as the environmental dose conditions, and the appropriate installation site was finally determined, where the installation schematic of the first sonotrode may be as shown in fig. 3.
Fig. 3 is a schematic diagram of an ultrasonic generator arranged on the outer wall of a pipeline provided by the embodiment of the disclosure. As shown in fig. 3, 1 denotes a section of high temperature and high pressure helium pipeline, and the section of high temperature and high pressure helium pipeline 1 is an easy deposition area of a refueling loop of a high temperature gas cooled reactor. The outer wall of the pipeline in the area easy to deposit is additionally provided with 2 first ultrasonic generators, namely an ultrasonic generator 2 and an ultrasonic generator 3, and the ultrasonic generators 2 and 3 are arranged at intervals of 180 degrees in the circumferential direction of the pipeline. And 4, a pulse controller, wherein the pulse controller 4 is respectively connected with the ultrasonic generator 2 and the ultrasonic generator 3, and the pulse controller 4 respectively controls the operation of the ultrasonic generator 2 and the ultrasonic generator 3. And 5, a dust filter.
And step S12, adding a second ultrasonic generator on the outer wall of the upstream pipeline close to the dust filter of the high-temperature gas cooled reactor.
In this embodiment, the outer wall of the upstream pipe close to the dust filter of the high temperature gas cooled reactor in step S12 is the outer wall of the pipe closest to the straight pipe section of the dust filter (also referred to as dust filter).
In this embodiment, the second ultrasonic generator in step S12 is a generic term for an ultrasonic generator attached to the outer wall of the upstream pipe near the dust filter of the high temperature gas cooled reactor.
In step S12, the second ultrasonic generator includes a plurality of ultrasonic generators, and when the second ultrasonic generator is attached, the ultrasonic generators are uniformly arranged at a predetermined included angle. For example, when the second ultrasonic generator is added, the ultrasonic generators are uniformly arranged on the outer wall of the pipe at angular intervals of 180 °, 120 ° or 90 °.
And step S13, operating the first ultrasonic generator according to a set period, and continuously operating the second ultrasonic generator.
In this embodiment, operating the first ultrasonic generator at the set period in step S13 can make the dust (i.e., graphite dust) fall off by using the sonic vibration to continue circulating with the gas (e.g., helium gas) in the recharging circuit.
In step S13, the first ultrasonic generator is operated according to a set cycle, including: the set period is divided into an operation period during which the first ultrasonic generator is started and a stop period during which the first ultrasonic generator is stopped. The set period may be, for example, a period in units of time such as days, weeks, and months. Therefore, the first ultrasonic generator can be started at set periodic intervals. For example, setting the cycle to be 1 day and the operation time period to be 0.5 hour, after the arrangement of the first ultrasonic generator is completed, setting the starting time to be 0.5 hour every day, and promoting the deposited graphite dust to be separated from the metal pipe wall to reenter the material loading and changing loop.
In the present embodiment, the continuous operation of the second ultrasonic generator in step S13 enables the dust diameter (i.e., the particle diameter of the graphite dust) to be increased by the principle of agglomeration, and the filtering effect (i.e., the capturing efficiency) to be improved. Specifically, the second ultrasonic generator immediately adjacent to the dust filter is kept in continuous operation, and the proportion of graphite dust particles with diameters of more than 1 μm is increased by utilizing the coagulation principle, so that the efficiency of the dust filter is improved.
And step S14, obtaining a particle deposition rate change value of the graphite dust in the easy deposition area, and adjusting the positions and working parameters of the first ultrasonic generator and the second ultrasonic generator based on the particle deposition rate change value.
In some embodiments, step S14 obtains the deposition condition of the graphite dust in the deposition-prone region, and adjusts the positions and operating parameters of the first ultrasonic generator and the second ultrasonic generator based on the deposition condition of the graphite dust.
In some embodiments, the graphite dust deposition profile includes a particle deposition rate change value of the graphite dust.
In some embodiments, the particle deposition rate variation value of the graphite dust of the easy deposition area (e.g., accessible portion of the easy deposition area) may be obtained through the reload loop apparatus disassembly window in step S14. Wherein the change value of the particle deposition rate of the graphite dust is the rechecking condition of the deposition rate of the graphite dust.
In some embodiments, the load change loop equipment disassembly window is a time window, which refers to the moment when each equipment in the load change loop is subjected to preventive disassembly maintenance, i.e., the graphite dust deposition condition on the inner wall of the open pipeline can be checked in step S14 when each equipment in the load change loop (i.e., the load change pipeline) is subjected to preventive disassembly maintenance.
In the present embodiment, the particle deposition rate variation value of the graphite dust in step S14 can be obtained by calculation based on the initial particle deposition rate and the particle deposition rates obtained after the operation of the first ultrasonic wave generator and the second ultrasonic wave generator.
In this embodiment, the operating parameters of the first ultrasonic generator and the second ultrasonic generator may include, but are not limited to, the frequency of the ultrasonic generator, the set period and the operation period of the first ultrasonic generator, and the like.
In some embodiments, the deposition condition of the graphite dust further includes a deposition tendency, i.e., step S14 can further obtain the deposition tendency of the graphite dust in the deposition-prone region, and adjust the positions and operating parameters of the first ultrasonic generator and the second ultrasonic generator based on the deposition tendency and the particle deposition rate variation value.
In some embodiments, the graphite soot deposition profile may also include an open site graphite soot deposition variation. Wherein, the opening part of the equipment after disassembly is the opening part because the equipment needing disassembly and maintenance is arranged on the material changing loop.
In some embodiments, graphite soot deposition conditions may also include piping radiation hot spot variations, and the like.
In some embodiments, the positions and working parameters of the first ultrasonic generator and the second ultrasonic generator are adjusted according to the graphite dust deposition rate rechecking condition, the graphite dust deposition change condition at the opening part, the pipeline radiation hot spot change condition and the like. Therefore, the rechecking condition of the deposition rate of the graphite dust, the deposition change condition of the graphite dust at the opening part, the radiation hot spot change condition of the pipeline and the like can be comprehensively considered, the parts which are sequenced to the front after the rechecking of the deposition rate, the parts with faster deposition, the parts with obvious increase of the radiation dosage of the pipeline and the like are inspected on site, the positions of the ultrasonic generators in the existing first ultrasonic generator and the second ultrasonic generator are increased or adjusted to optimize the sound wave oscillation effect, and in addition, the parameters of the ultrasonic generators of the first ultrasonic generator and the second ultrasonic generator, the set period of the first ultrasonic generator, the running period and the like are adjusted and optimized.
In some embodiments, the parameters of the ultrasonic generator frequency of the first ultrasonic generator and the second ultrasonic generator, the set period and the running period of the first ultrasonic generator and the like can be adjusted and optimized by combining experimental experience.
In some embodiments, step S14 may further obtain a graphite dust sample after the first and second ultrasonic generators are operated, perform particle size distribution measurements on the graphite dust sample, and modify the initial particle deposition rate in step S11 based on the measurements.
In the high-temperature gas-cooled reactor graphite dust trapping optimization method, the initial particle deposition rate of a loading and refueling loop of a high-temperature gas-cooled reactor is obtained, an easily deposited area is determined based on the initial particle deposition rate, and a first ultrasonic generator is additionally arranged on the outer wall of a pipeline of the easily deposited area; a second ultrasonic generator is additionally arranged on the outer wall of an upstream pipeline close to a dust filter of the high-temperature gas cooled reactor; operating the first ultrasonic generator according to a set period, and continuously operating the second ultrasonic generator; and obtaining a particle deposition rate change value of the graphite dust in the easy deposition area, and adjusting the positions and working parameters of the first ultrasonic generator and the second ultrasonic generator based on the particle deposition rate change value. Under the condition, by utilizing the ultrasonic oscillation principle, the binding force between the deposited graphite dust and the metal pipe wall is damaged by the first ultrasonic generator in operation, the graphite dust is caused to fall off and reenters the material loading and changing loop, and is further filtered by the dust filter along with the gas in the material loading and changing loop, so that the deposition amount and the deposition rate of the graphite dust in the material loading and changing loop are reduced, meanwhile, the micro-particle coagulation effect caused by the ultrasonic oscillation is utilized, the micro-particle coagulation effect is generated by the second ultrasonic generator in operation, the diameter of the graphite dust at the inlet of the dust filter is increased, the deposition amount of the graphite dust in the material loading and changing loop is reduced, the filtering efficiency of the dust filter is improved, and the graphite dust collecting efficiency of the high-temperature gas cooled reactor is improved. In addition, the method disclosed by the invention is also suitable for a helium environment, and in this case, the method disclosed by the invention can also be called a graphite dust collection optimization method for the helium environment of the high-temperature gas cooled reactor.
The following are embodiments of the disclosed system that may be used to perform embodiments of the disclosed method. For details not disclosed in the embodiments of the system of the present disclosure, refer to the embodiments of the method of the present disclosure.
Referring to fig. 4, fig. 4 is a block diagram of a high temperature gas cooled reactor graphite dust capture optimization system according to an embodiment of the present disclosure. The high-temperature gas cooled reactor graphite dust trapping optimization system 10 comprises an ultrasonic generator module 11, a control module 12 and a processing module 13, wherein:
the ultrasonic generator module 11 comprises a first ultrasonic generator arranged on the outer wall of the pipeline of the easy deposition area and a second ultrasonic generator arranged on the outer wall of the upstream pipeline close to the dust filter of the high-temperature gas cooled reactor;
the control module 12 is used for controlling the first ultrasonic generator to operate according to a set period and continuously controlling the second ultrasonic generator to operate;
and the processing module 13 is used for obtaining the initial particle deposition rate of the refueling loop of the high-temperature gas cooled reactor before the ultrasonic generator module is additionally arranged, determining an easily-deposited area based on the initial particle deposition rate, obtaining a particle deposition rate change value of graphite dust in the easily-deposited area after the ultrasonic generator module is additionally arranged, and adjusting the positions and working parameters of the first ultrasonic generator and the second ultrasonic generator based on the particle deposition rate change value.
Optionally, the control module 12 is specifically configured to control the operation of the first ultrasonic generator according to a set period; the set period is divided into an operation period during which the first ultrasonic generator is started and a stop period during which the first ultrasonic generator is stopped.
Optionally, the processing module 13, before the ultrasonic generator module is added, is specifically configured to: selecting a typical part of a charging and refueling loop of the high-temperature gas cooled reactor aiming at graphite dust, wherein the typical part comprises a plurality of areas; obtaining the initial particle deposition rate of a typical part under the coupling action of a plurality of deposition mechanisms; arranging the initial particle deposition rates in a descending order, and sequentially selecting the initial particle deposition rates with preset number; and taking the area corresponding to the deposition rate of the initial particles with the preset number as an easy deposition area.
Optionally, the processing module 13 is further configured to obtain a deposition tendency of the graphite dust in the deposition-prone region, and adjust positions and operating parameters of the first ultrasonic generator and the second ultrasonic generator based on the deposition tendency and the particle deposition rate variation value.
It should be noted that the above explanation of the embodiment of the method for capturing and optimizing the graphite dust of the high temperature gas cooled reactor is also applicable to the system for capturing and optimizing the graphite dust of the high temperature gas cooled reactor of the embodiment, and is not repeated herein.
In the high-temperature gas cooled reactor graphite dust trapping optimization system, an ultrasonic generator module comprises a first ultrasonic generator and a second ultrasonic generator, wherein the first ultrasonic generator is additionally arranged on the outer wall of a pipeline of an easily deposited area, and the second ultrasonic generator is additionally arranged on the outer wall of an upstream pipeline close to a dust filter of a high-temperature gas cooled reactor; the control module controls the first ultrasonic generator to operate according to a set period and continuously controls the second ultrasonic generator to operate; the processing module obtains an initial particle deposition rate of a refueling loop of the high-temperature gas cooled reactor before the ultrasonic generator module is additionally arranged, determines an easily-deposited area based on the initial particle deposition rate, obtains a particle deposition rate change value of graphite dust in the easily-deposited area after the ultrasonic generator module is additionally arranged, and adjusts the positions and working parameters of the first ultrasonic generator and the second ultrasonic generator based on the particle deposition rate change value. Under the condition, by utilizing the ultrasonic oscillation principle, the binding force between the deposited graphite dust and the metal pipe wall is damaged by the first ultrasonic generator in operation, the graphite dust is caused to fall off and reenters the material loading and changing loop, and is further filtered by the dust filter along with the gas in the material loading and changing loop, so that the deposition amount and the deposition rate of the graphite dust in the material loading and changing loop are reduced, meanwhile, the micro-particle coagulation effect caused by the ultrasonic oscillation is utilized, the micro-particle coagulation effect is generated by the second ultrasonic generator in operation, the diameter of the graphite dust at the inlet of the dust filter is increased, the deposition amount of the graphite dust in the material loading and changing loop is reduced, the filtering efficiency of the dust filter is improved, and the graphite dust collecting efficiency of the high-temperature gas cooled reactor is improved. In addition, the system of the present disclosure is also applicable to a helium environment, and in this case, the system of the present disclosure may also be referred to as a graphite dust capture optimization system of a high temperature gas cooled reactor helium environment.
It should be understood that various forms of the flows shown above may be used, with steps reordered, added, or deleted. For example, the steps described in the present disclosure may be executed in parallel, sequentially or in different orders, and the present disclosure is not limited thereto as long as the desired results of the technical aspects of the present disclosure can be achieved.
The above detailed description should not be construed as limiting the scope of the disclosure. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made, depending on design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
Claims (10)
1. A high-temperature gas cooled reactor graphite dust capture optimization method is characterized by comprising the following steps:
obtaining the initial particle deposition rate of a loading and refueling loop of a high-temperature gas cooled reactor, determining an easily-deposited area based on the initial particle deposition rate, and additionally installing a first ultrasonic generator on the outer wall of a pipeline of the easily-deposited area;
a second ultrasonic generator is additionally arranged on the outer wall of an upstream pipeline close to a dust filter of the high-temperature gas cooled reactor;
operating the first ultrasonic generator according to a set period, and continuously operating the second ultrasonic generator;
and obtaining a particle deposition rate change value of the graphite dust in the deposition-prone area, and adjusting the positions and working parameters of the first ultrasonic generator and the second ultrasonic generator based on the particle deposition rate change value.
2. The method for optimizing the dust collection of the graphite powder in the high temperature gas cooled reactor according to claim 1, wherein the obtaining of the initial particle deposition rate of the refueling circuit of the high temperature gas cooled reactor and the determining of the deposition prone area based on the initial particle deposition rate comprise:
selecting a typical part of a charging and refueling loop of a high-temperature gas cooled reactor aiming at graphite dust, wherein the typical part comprises a plurality of areas;
obtaining the initial particle deposition rate of the typical part under the coupling action of a plurality of deposition mechanisms;
arranging the initial particle deposition rates in a descending order, and sequentially selecting a preset number of initial particle deposition rates;
and taking the area corresponding to the preset number of initial particle deposition rates as an easy deposition area.
3. The method for capturing and optimizing the graphite dust in the high temperature gas cooled reactor according to claim 1, wherein the operating the first ultrasonic generator according to the set period comprises the following steps:
and dividing a set period into an operation period and a stop period, starting the first ultrasonic generator in the operation period, and stopping the first ultrasonic generator in the stop period.
4. The method for capturing and optimizing the graphite dust in the high-temperature gas-cooled reactor according to claim 1, wherein the first ultrasonic generator or the second ultrasonic generator comprises a plurality of ultrasonic generators respectively, and the ultrasonic generators are uniformly arranged according to a preset included angle when the first ultrasonic generator or the second ultrasonic generator is additionally arranged.
5. The method for optimizing the dust capture of the graphite powder in the high temperature gas cooled reactor according to claim 1, further comprising:
and acquiring the deposition trend of the graphite dust in the easy deposition area, and adjusting the positions and working parameters of the first ultrasonic generator and the second ultrasonic generator based on the deposition trend and the particle deposition rate change value.
6. The method for optimizing dust collection of graphite dust in a high temperature gas cooled reactor according to claim 1 or 5, further comprising:
and after the first ultrasonic generator and the second ultrasonic generator operate, obtaining a graphite dust sample, carrying out particle size distribution measurement on the graphite dust sample, and correcting the initial particle deposition rate based on the measurement result.
7. A high temperature gas cooled reactor graphite dust capture optimization system, comprising:
the ultrasonic generator module comprises a first ultrasonic generator arranged on the outer wall of the pipeline of the easy deposition area and a second ultrasonic generator arranged on the outer wall of the upstream pipeline close to the dust filter of the high-temperature gas cooled reactor;
the control module is used for controlling the first ultrasonic generator to operate according to a set period and continuously controlling the second ultrasonic generator to operate;
the processing module is used for obtaining the initial particle deposition rate of a charging and refueling loop of the high-temperature gas cooled reactor before the ultrasonic generator module is added, determining an easily deposited area based on the initial particle deposition rate, obtaining the particle deposition rate change value of graphite dust in the easily deposited area after the ultrasonic generator module is added, and adjusting the positions and working parameters of the first ultrasonic generator and the second ultrasonic generator based on the particle deposition rate change value.
8. The system of claim 7, wherein the processing module, prior to being installed with the ultrasonic generator module, is specifically configured to:
selecting a typical part of a charging and refueling loop of a high-temperature gas cooled reactor aiming at graphite dust, wherein the typical part comprises a plurality of areas;
obtaining the initial particle deposition rate of the typical part under the coupling action of a plurality of deposition mechanisms;
the initial particle deposition rates are arranged in a descending order, and the initial particle deposition rates with preset number are selected in sequence;
and taking the area corresponding to the preset number of initial particle deposition rates as an easy deposition area.
9. The high temperature gas cooled reactor graphite dust capture optimization system of claim 7, wherein the control module, when being configured to control the operation of the first ultrasonic generator according to a set period, is specifically configured to;
and dividing a set period into an operation period and a stop period, starting the first ultrasonic generator in the operation period, and stopping the first ultrasonic generator in the stop period.
10. The high temperature gas cooled reactor graphite dust capture optimization system of claim 7, wherein the processing module is further configured to obtain a deposition trend of graphite dust in the deposition prone region, and adjust the position and operating parameters of the first ultrasonic generator and the second ultrasonic generator based on the deposition trend and the particle deposition rate variation value.
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| CN202210707421.2A CN115116636A (en) | 2022-06-21 | 2022-06-21 | High-temperature gas cooled reactor graphite dust trapping optimization method and system |
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| CN202210707421.2A CN115116636A (en) | 2022-06-21 | 2022-06-21 | High-temperature gas cooled reactor graphite dust trapping optimization method and system |
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