CN115116636B - Optimization method and system for capturing graphite dust in high temperature gas-cooled reactor - Google Patents
Optimization method and system for capturing graphite dust in high temperature gas-cooled reactor Download PDFInfo
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- CN115116636B CN115116636B CN202210707421.2A CN202210707421A CN115116636B CN 115116636 B CN115116636 B CN 115116636B CN 202210707421 A CN202210707421 A CN 202210707421A CN 115116636 B CN115116636 B CN 115116636B
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Abstract
The invention provides a method and a system for optimizing graphite dust trapping of a high-temperature gas cooled reactor, wherein the method comprises the steps of obtaining an initial particle deposition rate of a loading and reloading loop of the high-temperature gas cooled reactor, determining an easy deposition area based on the initial particle deposition rate, additionally arranging a first ultrasonic generator on the outer wall of a pipeline in the easy deposition area, additionally arranging a second ultrasonic generator 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, continuously operating the second ultrasonic generator, obtaining a particle deposition rate change value of graphite dust in the easy deposition area, and adjusting 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 graphite dust trapping efficiency of the high-temperature gas cooled reactor can be improved.
Description
Technical Field
The disclosure relates to the technical field of high-temperature gas cooled reactor graphite dust trapping, in particular to a high-temperature gas cooled reactor graphite dust trapping 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 used as 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 economy and ecological environment.
During the operation of the reactor, the core is loaded with hundreds of thousands of fuel spheres which are added to the reactor core through the top-of-stack loading tubes and exit through the bottom-of-stack unloading tubes. However, the fuel balls can rub and abrade with themselves, the inner members of the graphite pile, the pipelines and equipment of the fuel loading and unloading system and generate graphite dust in the circulating process. As the accumulation of graphite dust in the loop assembly may affect the circulation of the fuel spheres and may locally form radioactive hot spots, inconvenience is brought to maintenance and overhaul of the equipment, and radioactive pollution caused by leakage of graphite dust into the environment through pipeline openings in the event of an accident is also a very concerned problem in modern nuclear safety design.
In order to remove graphite dust and gas impurities such as CO, CO 2、H2 and the like in a high-temperature gas cooled reactor, a helium purifying system is designed in the prior art. In helium purification systems, dust is filtered using a tubular dust filter to remove solid particles above 1 μm in diameter. However, research on the German AVR test ball bed type high temperature gas cooled reactor shows that most graphite dust is deposited in the reactor core and the loading and unloading loop, and only a small part of graphite dust enters the helium purifying loop. Most graphite dust gradually deposits on the surface of the primary circuit and in the flow dead zone, carried by the helium coolant. Further, the study of the AVR test stack also showed that the diameter of graphite dust was mostly less than 1 μm and the median diameter of graphite dust was 0.76 μm, resulting in a decrease in the filtration efficiency of the dust filter. Therefore, the existing graphite dust trapping efficiency of the high-temperature gas cooled reactor needs to be improved.
Disclosure of Invention
The present disclosure aims to solve, at least to some extent, one of the technical problems in the related art.
For this reason, a first object of the present disclosure is to propose a method for optimizing graphite dust trapping of a high-temperature gas cooled reactor, so as to improve the efficiency of graphite dust trapping of the high-temperature gas cooled reactor.
A second object of the present disclosure is to provide a high temperature gas cooled reactor graphite dust trapping optimization system.
To achieve the above objective, an embodiment of a first aspect of the present disclosure provides a method for optimizing graphite dust collection in a high temperature gas cooled reactor, including:
Obtaining an initial particle deposition rate of a loading and unloading loop of a high-temperature gas cooled reactor, determining an easy deposition area based on the initial particle deposition rate, and additionally arranging a first ultrasonic generator on the outer wall of a pipeline in the easy deposition area;
A second ultrasonic generator is additionally arranged on the outer wall of an upstream pipeline close to the 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.
In one embodiment of the disclosure, the method for obtaining the initial particle deposition rate of the charge loop of the high-temperature gas cooled reactor comprises selecting a typical part of the charge loop of the high-temperature gas cooled reactor for 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, 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 the deposition facilitating area.
In one embodiment of the present disclosure, the operating the first ultrasonic generator according to a set period includes dividing the set period into an operation period in which the first ultrasonic generator is started and a stop period in which the first ultrasonic generator is stopped.
In one embodiment of the present disclosure, the first ultrasonic generator or the second ultrasonic generator respectively includes a plurality of ultrasonic generators, 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 installed.
In one embodiment of the present disclosure, a deposition trend of graphite dust of the deposition prone region is obtained, and the positions and operating parameters of the first and second ultrasonic generators are adjusted based on the deposition trend and the particle deposition rate variation value.
In one embodiment of the present disclosure, after the first and second ultrasonic generators are operated, a graphite dust sample is obtained, 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.
To achieve the above object, an embodiment of a second aspect of the present disclosure provides a graphite dust trapping optimization system for a high temperature gas cooled reactor, including:
The ultrasonic generator module comprises a first ultrasonic generator which is additionally arranged on the outer wall of the pipeline in the easy-to-deposit area and a second ultrasonic generator which is additionally arranged on the outer wall of the pipeline near 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 loading loop of the high-temperature gas cooled reactor before the ultrasonic generator module is additionally arranged, determining an easy deposition area based on the initial particle deposition rate, obtaining the particle deposition rate change value of graphite dust in the easy deposition 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.
In one embodiment of the disclosure, the processing module is specifically configured to select a typical part of a loading loop of a high-temperature gas cooled reactor for graphite dust, where the typical part includes a plurality of areas, obtain initial particle deposition rates of the typical part under the coupling action of a plurality of deposition mechanisms, arrange the initial particle deposition rates in a descending order, sequentially select a preset number of initial particle deposition rates, and use an area corresponding to the preset number of initial particle deposition rates as an easy deposition area.
In one embodiment of the disclosure, the control module is used for dividing a set period into an operation period and a stop period when the control module is used for controlling the first ultrasonic generator to operate according to the set period, and starting the first ultrasonic generator in the operation period and stopping the first ultrasonic generator in the stop period.
In one embodiment of the disclosure, the processing module is further configured to obtain a deposition trend of graphite dust in the deposition prone region, and adjust the positions and operating parameters of the first and second ultrasonic generators based on the deposition trend and the particle deposition rate variation value.
In one or more embodiments of the disclosure, an initial particle deposition rate of a charge loop of a high-temperature gas cooled reactor is obtained, an easy deposition area is determined based on the initial particle deposition rate, a first ultrasonic generator is additionally arranged 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 of a dust filter close to the high-temperature gas cooled reactor, the first ultrasonic generator is operated according to a set period, the second ultrasonic generator is continuously operated, a particle deposition rate change value of graphite dust in the easy deposition area is obtained, and the positions and working parameters of the first ultrasonic generator and the second ultrasonic generator are adjusted based on the particle deposition rate change value. Under the condition, the first ultrasonic generator is utilized to destroy the binding force of the deposited graphite dust and the metal pipe wall, so that the graphite dust falls off and reenters the loading and reloading loop, the second ultrasonic generator is utilized to generate tiny particle agglomeration, the diameter of the graphite dust at the inlet of the dust filter is increased, the deposition amount of the graphite dust in the loading and reloading loop is reduced, and the graphite dust capturing 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 prior art, the drawings that are required in the detailed description or the prior art will be briefly described, it will be apparent that the drawings in the following description are some embodiments of the present disclosure, and other drawings may be obtained according to the drawings without inventive effort for a person of ordinary skill in the art. 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, in which:
fig. 1 is a schematic flow chart of a method for optimizing graphite dust trapping of a high-temperature gas cooled reactor according to an embodiment of the disclosure;
FIG. 2 is a flow chart of a method for determining an easily deposited area according to an embodiment of the disclosure;
FIG. 3 is a schematic view of an ultrasonic generator disposed on an outer wall of a pipe according to an embodiment of the present disclosure;
fig. 4 is a block diagram of a high temperature gas cooled reactor graphite dust trapping optimization system provided by an embodiment of the present disclosure.
Detailed Description
Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the embodiments of the present disclosure. Rather, they are merely examples of apparatus and methods consistent with aspects of embodiments of the present disclosure as detailed in the accompanying claims.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means 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, schematic representations of the above terms are not necessarily directed 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, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present disclosure, the meaning of "a plurality" is at least two, such as two, three, etc., unless explicitly specified otherwise. It should also be understood that the term "and/or" as used in this disclosure refers to and encompasses any or all possible combinations of one or more of the associated listed items.
Embodiments of the present disclosure are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and intended for the purpose of explaining the present disclosure and are not to be construed as limiting the present disclosure.
The disclosure provides a method and a system for optimizing graphite dust trapping of a high-temperature gas cooled reactor, and mainly aims to improve the efficiency of graphite dust trapping of the high-temperature gas cooled reactor by arranging an ultrasonic generator at a specific part.
In a first embodiment, fig. 1 is a schematic flow chart of a method for optimizing graphite dust trapping in a high-temperature gas cooled reactor according to an embodiment of the disclosure. As shown in FIG. 1, the method for optimizing graphite dust collection of the high-temperature gas cooled reactor comprises the following steps:
And S11, obtaining an initial particle deposition rate of a loading and unloading loop of the 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 in the easy deposition 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 added or before the 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 size 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 size, and the like. If conditions such as particle diameter change are found, the initial particle deposition rate needs to be recalculated.
Fig. 2 is a flowchart of a method for determining an easy deposition area according to an embodiment of the disclosure. In some embodiments, the initial particle deposition rate of the charge loop of the high-temperature gas cooled reactor is obtained in the step S11, and the deposition-prone area is determined based on the initial particle deposition rate, as shown in fig. 2, specifically, the method comprises the steps of selecting a typical part of the charge loop of the high-temperature gas cooled reactor for graphite dust (step S111), obtaining the initial particle deposition rate of the typical part under the coupling action of multiple deposition mechanisms (step S112), arranging the initial particle deposition rates in a descending order, sequentially selecting a preset number of initial particle deposition rates (step S113), and taking the area corresponding to the preset number of initial particle deposition rates as the deposition-prone area (step S114).
In some embodiments, the charge circuit in step S111 is, for example, a helium circuit.
In some embodiments, typical locations in step S111 are, for example, typical areas upstream and downstream of the ball breaker of the charge circuit, upstream and downstream of the choke, the lowest end of the circuit, and so on.
In some embodiments, the multiple deposition mechanisms in step S112 are, for example, multiple mechanisms such as thermophoresis deposition, turbulent deposition, etc., and the initial particle deposition rate under the coupling action of the multiple mechanisms such as thermophoresis deposition, turbulent deposition, etc. is calculated.
In some embodiments, the preset number in step S113 may be, for example, 3, i.e., the initial particle deposition rate of the first 3 bits in the descending sequence is selected. The region corresponding to the initial particle deposition rate of the first 3 bits may be regarded as a deposition-prone region.
In other embodiments, after the easy-to-deposit region is obtained, the easy-to-deposit region can be adjusted by combining domestic and foreign experience feedback and actual operation conditions, so that a more accurate easy-to-deposit position is obtained.
In other embodiments, the location of the easy-to-deposit area where the first ultrasonic generator is installed may be determined by verifying the feasibility of the placement of the ultrasonic generator, and the environmental dose, in situ, for the identified easy-to-deposit area.
In this embodiment, the first ultrasonic generator is additionally mounted on the outer wall of the pipeline in the easy-to-deposit area in step S11, which specifically includes the first ultrasonic generator being additionally mounted on the outer wall of the pipeline in the accessible portion of the easy-to-deposit area. Where the outer wall of the conduit of the accessible portion may refer to a location that is spatially accessible to personnel or equipment, and where the environmental dose rate is assessed during a overhaul to allow access to the personnel or equipment.
In this embodiment, the first ultrasonic generator in step S11 is a generic term for an ultrasonic generator attached to the outer wall of the pipe in the deposition-prone area.
In step S11, the first ultrasonic generator includes a plurality of ultrasonic generators, and the ultrasonic generators are uniformly arranged according to a preset included angle when the first ultrasonic generator is additionally installed. Wherein the preset included angle is the included angle of the adjacent ultrasonic generators. The predetermined angle is, for example, one of 180 °, 120 ° and 90 °, that is, when the first ultrasonic generator is added, the ultrasonic generators are uniformly arranged on the outer wall of the pipe at intervals of 180 °, 120 ° or 90 °.
In some embodiments, typical parts such as the upstream and downstream of a ball breaking separation device of a charging loop, the upstream and downstream of a flow blocking device, the lowest end of the loop and the like are selected aiming at graphite dust with the particle size of 0.1-10 mu m, initial particle deposition rates under the coupling action of various mechanisms such as thermophoresis deposition, turbulent flow deposition and the like are analyzed, the part 3 of the initial particle deposition rate is selected as an easy deposition area, and simultaneously, the easy deposition part can be adjusted by combining the operation experience feedback and actual operation conditions of high-temperature gas cooled reactors in foreign countries such as Germany, america and the like. For the identified sites, the feasibility of the sonotrode arrangement is verified in situ, and the environmental dose situation, and the appropriate installation site is finally determined, wherein a schematic installation of the first sonotrode can be shown in fig. 3.
Fig. 3 is a schematic view of an ultrasonic generator disposed on an outer wall of a pipeline according to an embodiment of the present disclosure. As shown in fig. 3, 1 represents a section of high-temperature high-pressure helium gas pipeline, and the section of high-temperature high-pressure helium gas pipeline 1 is an easy-to-deposit area of a loading and reloading loop of a high-temperature gas cooled reactor. The outer wall of the pipeline in the easy-to-deposit area is additionally provided with 2 first ultrasonic generators, namely an ultrasonic generator 2 and an ultrasonic generator 3, and the ultrasonic generators 2 and the ultrasonic generators 3 are arranged at 180-degree intervals in the circumferential direction of the pipeline. And 4 represents a pulse controller, 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. Reference numeral 5 denotes a dust filter.
And 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 pipe upstream of the dust filter in the high temperature gas cooled reactor in step S12 is the outer wall of the pipe at the position of the straight pipe section upstream closest to the dust filter (also referred to as the 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 pipeline 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 the ultrasonic generators are uniformly arranged according to a preset included angle when the second ultrasonic generator is additionally installed. For example, when the second ultrasonic generators are added, the ultrasonic generators are uniformly arranged on the outer wall of the pipeline at an angle interval of 180 °, 120 ° or 90 °.
Step S13, the first ultrasonic generator is operated according to a set period, and the second ultrasonic generator is continuously operated.
In this embodiment, the first ultrasonic generator operating at the set period in step S13 can utilize sonic vibration to make the dust (i.e., graphite dust) fall off and continue to circulate with the gas (e.g., helium) in the charge-up circuit.
In step S13, the first ultrasonic generator is operated in accordance with a set period, including dividing the set period into an operation period in which the first ultrasonic generator is started and a stop period in which the first ultrasonic generator is stopped. The set period may be a period in units of time such as days, weeks, and months. Thus, the first ultrasonic generator can be started at set periodic intervals. For example, the period is set to be 1 day, and the operation period is set to be 0.5 hour, then after the first ultrasonic generator is arranged, the first ultrasonic generator is set to be started for 0.5 hour each day, so that the deposited graphite dust is separated from the metal pipe wall, and the deposited graphite dust enters the charging and discharging loop again.
In the present embodiment, the continuous operation of the second ultrasonic generator in step S13 can increase the dust diameter (i.e., the particle diameter of the graphite dust) by utilizing the agglomeration principle, and improve the filtering effect (i.e., the trapping efficiency). Specifically, the second ultrasonic generator closely adjacent to the dust filter keeps continuously running, and the proportion of graphite dust particles with the diameter of more than 1 mu m is increased by utilizing the condensation principle, so that the efficiency of the dust filter is improved.
And S14, obtaining a particle deposition rate change value of graphite dust in the easy-deposition area, and adjusting the positions and the 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 a deposition of graphite dust in the deposition prone region, and adjusts the positions and operating parameters of the first and second ultrasonic generators based on the deposition of graphite dust.
In some embodiments, the graphite dust deposition condition includes a particle deposition rate variation value of the graphite dust.
In some embodiments, the particle deposition rate variation value of the graphite dust of the deposition-prone region (e.g., an accessible portion of the deposition-prone region) may be obtained through the charge-loop apparatus disassembly window in step S14. The particle deposition rate change value of the graphite dust is the graphite dust deposition rate rechecking condition.
In some embodiments, the disassembly window of the charging circuit equipment is a time window, and the time window refers to the moment of preventive disassembly maintenance of each equipment of the charging circuit, that is, graphite dust deposition on the inner wall of the opening pipeline can be checked in step S14 when each equipment on the charging circuit (i.e. the charging pipeline) is preventive disassembly maintenance.
In this embodiment, the particle deposition rate variation value of the graphite dust in step S14 may be calculated based on the initial particle deposition rate and the particle deposition rate obtained after the operation of the first ultrasonic generator and the second ultrasonic generator.
In this embodiment, the working parameters of the first ultrasonic generator and the second ultrasonic generator may include, but are not limited to, parameters such as the frequency of the ultrasonic generator, the setting period and the operation period of the first ultrasonic generator.
In some embodiments, the graphite dust deposition condition further includes a deposition trend, that is, step S14 may further obtain a deposition trend of graphite dust in the deposition prone area, and adjust the positions and the operating parameters of the first ultrasonic generator and the second ultrasonic generator based on the deposition trend and the particle deposition rate variation value.
In some embodiments, the graphite dust deposition profile may also include an open site graphite dust deposition profile. Wherein, because the equipment which needs disassembly and maintenance is arranged on the loading and reloading loop, the opening position after the disassembly of the equipment is the opening position.
In some embodiments, the graphite dust deposition conditions may also include pipe radiant 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 rechecking condition of the deposition rate of graphite dust, the deposition change condition of graphite dust at the opening part, the change condition of a radiation hot spot of a pipeline and the like. Therefore, the graphite dust deposition rate rechecking condition can be comprehensively considered, the graphite dust deposition change condition of the opening part, the pipeline radiation hot spot change condition and the like are used for checking the position of the front part of the rechecking of the deposition rate, the position of the part of the pipeline with faster deposition, the position of each ultrasonic generator in the existing first ultrasonic generator and the position of each ultrasonic generator in the existing second ultrasonic generator are increased or adjusted to optimize the sonic oscillation effect, and in addition, parameters such as the ultrasonic generator frequency of the first ultrasonic generator and the second ultrasonic generator, the setting period and the operation period of the first ultrasonic generator and the like are adjusted and optimized.
In some embodiments, when parameters such as the ultrasonic generator frequency of the first ultrasonic generator and the second ultrasonic generator, the setting period and the operation period of the first ultrasonic generator are adjusted and optimized, experimental experience can be combined to adjust and optimize the parameters.
In some embodiments, after the first and second ultrasonic generators are operated, step S14 may further obtain a graphite dust sample, perform a particle size distribution measurement on the graphite dust sample, and correct the initial particle deposition rate in step S11 based on the measurement result.
In the method for optimizing graphite dust trapping of the high-temperature gas cooled reactor, an initial particle deposition rate of a loading and unloading loop of the high-temperature gas cooled reactor is obtained, an easy deposition area is determined based on the initial particle deposition rate, a first ultrasonic generator is additionally arranged 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 of a dust filter close to the high-temperature gas cooled reactor, the first ultrasonic generator is operated according to a set period, the second ultrasonic generator is operated continuously, a particle deposition rate change value of graphite dust in the easy deposition area is obtained, and the positions and working parameters of the first ultrasonic generator and the second ultrasonic generator are adjusted based on the particle deposition rate change value. Under the condition, the binding force of the deposited graphite dust and the metal pipe wall is destroyed through the first ultrasonic generator which operates by utilizing the ultrasonic oscillation principle, so that the graphite dust falls off and reenters the loading and reloading loop, and the gas in the loading and reloading loop is further filtered through the dust filter, so that the deposition amount and deposition rate of the graphite dust in the loading and reloading loop are reduced, meanwhile, the tiny particle agglomeration caused by ultrasonic oscillation is utilized, the tiny particle agglomeration is generated through the second ultrasonic generator which operates, the diameter of the graphite dust at the inlet of the dust filter is increased, the deposition amount of the graphite dust in the loading and reloading loop is reduced, and the filtering efficiency of the dust filter is improved, so that the graphite dust trapping efficiency of the high-temperature gas cooled reactor is improved. In addition, the method disclosed by the invention is also suitable for helium environment, and the method disclosed by the invention can be also called a graphite dust trapping optimization method of the helium environment of the high-temperature gas cooled reactor.
The following are system embodiments of the present disclosure that may be used to perform method embodiments of the present disclosure. For details not disclosed in the embodiments of the disclosed system, please refer to the embodiments of the disclosed method.
Referring to fig. 4, fig. 4 is a block diagram of a graphite dust trapping optimization system of a high-temperature gas cooled reactor according to an embodiment of the 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 which is arranged on the outer wall of the pipeline in the easy-to-deposit area and a second ultrasonic generator which is arranged on the outer wall of the pipeline near the dust filter of the high-temperature gas cooled reactor;
A control module 12 for controlling the operation of the first ultrasonic generator and continuously controlling the operation of the second ultrasonic generator according to a set period;
The processing module 13 is used for obtaining the initial particle deposition rate of the loading loop of the high-temperature gas cooled reactor before the ultrasonic generator module is added, determining the easy deposition area based on the initial particle deposition rate, obtaining the particle deposition rate change value of graphite dust in the easy deposition area after the ultrasonic generator module is added, and adjusting the positions and the 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 used for dividing the 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 when the first ultrasonic generator is controlled to operate according to the set period.
Optionally, the processing module 13 is specifically configured to select, for graphite dust, a typical part of a loading loop of the high-temperature gas cooled reactor, where the typical part includes a plurality of regions, obtain initial particle deposition rates of the typical part under the coupling action of a plurality of deposition mechanisms, arrange the initial particle deposition rates in a descending order, sequentially select a preset number of initial particle deposition rates, and use a region corresponding to the preset number of initial particle deposition rates as a deposition-prone region.
Optionally, the processing module 13 is further configured to obtain a deposition trend of graphite dust in the deposition prone area, and adjust the positions and the operating parameters of the first ultrasonic generator and the second ultrasonic generator based on the deposition trend and the particle deposition rate variation value.
It should be noted that the foregoing explanation of the embodiment of the method for optimizing the collection of graphite dust in a high-temperature gas cooled reactor is also applicable to the system for optimizing the collection of graphite dust in a high-temperature gas cooled reactor in this embodiment, and is not described herein.
In the graphite dust trapping optimizing system of the high-temperature gas cooled reactor, 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 easy-to-deposit area, the second ultrasonic generator is additionally arranged on the outer wall of an upstream pipeline of a dust filter close to the high-temperature gas cooled reactor, a control module controls the first ultrasonic generator to operate according to a set period and continuously controls the second ultrasonic generator to operate, a processing module obtains the initial particle deposition rate of a loading loop of the high-temperature gas cooled reactor before the ultrasonic generator module is additionally arranged, the easy-to-deposit area is determined based on the initial particle deposition rate, the particle deposition rate change value of graphite dust of the easy-to-deposit area is obtained after the ultrasonic generator module is additionally arranged, and the positions and the working parameters of the first ultrasonic generator and the second ultrasonic generator are adjusted based on the particle deposition rate change value. Under the condition, the binding force of the deposited graphite dust and the metal pipe wall is destroyed through the first ultrasonic generator which operates by utilizing the ultrasonic oscillation principle, so that the graphite dust falls off and reenters the loading and reloading loop, and the gas in the loading and reloading loop is further filtered through the dust filter, so that the deposition amount and deposition rate of the graphite dust in the loading and reloading loop are reduced, meanwhile, the tiny particle agglomeration caused by ultrasonic oscillation is utilized, the tiny particle agglomeration is generated through the second ultrasonic generator which operates, the diameter of the graphite dust at the inlet of the dust filter is increased, the deposition amount of the graphite dust in the loading and reloading loop is reduced, and the filtering efficiency of the dust filter is improved, so that the graphite dust trapping efficiency of the high-temperature gas cooled reactor is improved. In addition, the system of the present disclosure is also applicable to helium environments, and at this time, the system of the present disclosure can also be referred to as a graphite dust trapping optimization system of a high temperature gas cooled reactor helium environment.
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present disclosure may be performed in parallel, sequentially, or in a different order, so long as the desired result of the technical solution of the present disclosure can be achieved, and the present disclosure is not limited herein.
The above detailed description should not be taken as limiting the scope of the present disclosure. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present disclosure are intended to be included within the scope of the present disclosure.
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| CN202210707421.2A CN115116636B (en) | 2022-06-21 | 2022-06-21 | Optimization method and system for capturing graphite dust in high temperature gas-cooled reactor |
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| HTR-10一回路放射性石墨粉尘实验系统设计及研究;谢锋;曹建主;陈志鹏;董玉杰;;原子能科学技术;20150420(04);摘要、745页第1栏第1段-748页第2栏第1段 * |
| 颗粒-壁面相互作用对石墨粉尘在高温气冷堆蒸汽发生器换热管表面沉积过程的影响;魏明哲;张易阳;吴莘馨;雒晓卫;;原子能科学技术;20160820(08);摘要 * |
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