Optimization method and system for capturing graphite dust in high temperature gas-cooled reactor

Abstract

The present disclosure proposes a method and system for optimizing the capture of graphite dust in a high temperature gas-cooled reactor, which includes obtaining an initial particle deposition rate of a charging and recharging circuit of a high temperature gas-cooled reactor, determining an easy deposition area based on the initial particle deposition rate, and installing a first ultrasonic generator on the outer wall of a pipeline in the easy deposition area; installing a second ultrasonic generator on the outer wall of an upstream pipeline near a dust filter of the high temperature gas-cooled reactor; operating the first ultrasonic generator according to a set cycle, and continuously operating the second ultrasonic generator; obtaining a particle deposition rate change value of 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 in the present disclosure, the efficiency of capturing graphite dust in a high temperature gas-cooled reactor can be improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of high temperature gas-cooled reactor graphite dust capture, and in particular to a high temperature gas-cooled reactor graphite dust capture optimization method and system. Background Art

[0002] The high temperature gas-cooled reactor is a reactor that uses graphite as a moderator and helium as a coolant. As an advanced fourth-generation nuclear power reactor technology, the high temperature gas-cooled reactor has the advantages of good safety, high power generation efficiency, good economy and extremely wide application. It can replace traditional fossil energy and achieve coordinated development of the economy and the ecological environment.

[0003] During the operation of the reactor, the core is loaded with hundreds of thousands of fuel balls, which are added to the reactor core through the top loading pipe and flow out through the bottom unloading pipe. However, during the circulation process, the fuel balls will rub and wear against themselves, the internal components of the graphite pile, the pipelines and equipment of the fuel loading and unloading system, and produce graphite dust. The accumulation of graphite dust in the return line may affect the circulation of the fuel balls and may form radioactive hot spots locally, causing inconvenience to the maintenance and overhaul of the equipment. In the event of an accident, the radioactive contamination caused by the leakage of graphite dust into the environment through the pipeline rupture is also a very concerned issue in modern nuclear safety design.

[0004] In order to remove graphite dust and gas impurities such as CO, CO2, and H2 in high-temperature gas-cooled reactors, a helium purification system is designed in the prior art. In the helium purification system, dust is filtered by a tubular dust filter to remove solid particles with a diameter of more than 1 μm. However, research on the German AVR test pebble bed high-temperature gas-cooled reactor shows that most graphite dust will be deposited in the core and the loading and replacement loop, and only a small part will enter the helium purification loop. Most graphite dust is gradually deposited and attached on the surface of a loop and in the dead zone of the flow under the helium coolant. In addition, research on the AVR test reactor also shows that the diameter of most graphite dust is less than 1 μm, and the median diameter of graphite dust is 0.76 μm, which reduces the filtering efficiency of the dust filter. Therefore, the existing high-temperature gas-cooled reactor graphite dust capture efficiency needs to be improved. Summary of the invention

[0005] The present disclosure aims to solve one of the technical problems in the related art at least to some extent.

[0006] To this end, the first objective of the present disclosure is to propose a high temperature gas-cooled reactor graphite dust capture optimization method to improve the high temperature gas-cooled reactor graphite dust capture efficiency.

[0007] The second objective of the present disclosure is to provide a high temperature gas-cooled reactor graphite dust capture optimization system.

[0008] To achieve the above-mentioned purpose, the first embodiment of the present disclosure proposes a method for optimizing the capture of graphite dust in a high temperature gas-cooled reactor, comprising:

[0009] Obtaining an initial particle deposition rate of a charging and refueling loop of a high temperature gas-cooled reactor, determining a deposition-prone region based on the initial particle deposition rate, and installing a first ultrasonic generator on an outer wall of a pipeline in the deposition-prone region;

[0010] A second ultrasonic generator is installed on the outer wall of the upstream pipeline of the dust filter close to the high temperature gas-cooled reactor;

[0011] Running the first ultrasonic generator according to a set cycle, and continuously running the second ultrasonic generator;

[0012] A particle deposition rate change value of graphite dust in the easy deposition area is obtained, and positions and working parameters of the first ultrasonic generator and the second ultrasonic generator are adjusted based on the particle deposition rate change value.

[0013] In one embodiment of the present disclosure, the initial particle deposition rate of the charging and refueling loop of the high-temperature gas-cooled reactor is obtained, and the easy-deposition area is determined based on the initial particle deposition rate, including: for graphite dust, selecting a typical part of the charging and refueling loop of the high-temperature gas-cooled reactor, the typical part including a plurality of areas; obtaining the initial particle deposition rate of the typical part under the coupling action of multiple deposition mechanisms; arranging the initial particle deposition rates in descending order, and selecting a preset number of initial particle deposition rates in turn; and taking the area corresponding to the preset number of initial particle deposition rates as the easy-deposition area.

[0014] In one embodiment of the present disclosure, operating the first ultrasonic generator according to a set cycle includes: dividing the set cycle into an operating period and a stop period, starting the first ultrasonic generator during the operating period, and shutting down the first ultrasonic generator during the stop period.

[0015] In one embodiment of the present disclosure, the first ultrasonic generator or the second ultrasonic generator includes a plurality of ultrasonic generators respectively. When the first ultrasonic generator or the second ultrasonic generator is installed, the ultrasonic generators are evenly arranged at a preset angle.

[0016] In one embodiment of the present disclosure, the deposition trend of graphite dust in the easy-to-deposit area is obtained, and the positions and working 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.

[0017] In one embodiment of the present disclosure, after the first ultrasonic generator and the second ultrasonic generator are operated, a graphite dust sample is obtained, a particle size distribution of the graphite dust sample is measured, and the initial particle deposition rate is corrected based on the measurement results.

[0018] To achieve the above-mentioned purpose, the second embodiment of the present disclosure proposes a high temperature gas-cooled reactor graphite dust capture optimization system, comprising:

[0019] An ultrasonic generator module, the ultrasonic generator module comprising a first ultrasonic generator installed on the outer wall of the pipeline in the deposition-prone area and a second ultrasonic generator installed on the outer wall of the upstream pipeline near the dust filter of the high temperature gas-cooled reactor;

[0020] A control module, used for controlling the operation of the first ultrasonic generator according to a set period, and continuously controlling the operation of the second ultrasonic generator;

[0021] A processing module is used to obtain an initial particle deposition rate of a loading and unloading loop of a high-temperature gas-cooled reactor before installing the ultrasonic generator module, determine an easy-to-deposit area based on the initial particle deposition rate, obtain a particle deposition rate change value of graphite dust in the easy-to-deposit area after installing the ultrasonic generator module, and adjust the positions and working parameters of the first ultrasonic generator and the second ultrasonic generator based on the particle deposition rate change value.

[0022] In one embodiment of the present disclosure, the processing module, before the ultrasonic generator module is installed, is specifically used to: select a typical part of the loading and unloading circuit of the high-temperature gas-cooled reactor for graphite dust, wherein the typical part includes multiple areas; obtain the initial particle deposition rate of the typical part under the coupling of multiple deposition mechanisms; arrange the initial particle deposition rates in descending order, and select a preset number of initial particle deposition rates in turn; and use the area corresponding to the preset number of initial particle deposition rates as an easy deposition area.

[0023] In one embodiment of the present disclosure, the control module, when used to control the operation of the first ultrasonic generator according to a set cycle, is specifically used to: divide the set cycle into an operation period and a stop period, start the first ultrasonic generator in the operation period, and shut down the first ultrasonic generator in the stop period.

[0024] In one embodiment of the present disclosure, the processing module is also used to obtain the deposition trend of the graphite dust in the easy-to-deposit area, and adjust the position 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.

[0025] In one or more embodiments of the present disclosure, the initial particle deposition rate of the charging and recharging loop of the high temperature gas-cooled reactor is obtained, the easy deposition area is determined based on the initial particle deposition rate, and a first ultrasonic generator is installed on the outer wall of the pipeline in the easy deposition area; a second ultrasonic generator is installed on the outer wall of the upstream pipeline near the dust filter of the high temperature gas-cooled reactor; the first ultrasonic generator is operated according to a set cycle, and the second ultrasonic generator is continuously operated; the particle deposition rate change value of the graphite dust in the easy deposition area is obtained, and the position and working parameters of the first ultrasonic generator and the second ultrasonic generator are adjusted based on the particle deposition rate change value. In this case, the first ultrasonic generator is used to destroy the bonding force between the deposited graphite dust and the metal pipe wall, causing the graphite dust to fall off and re-enter the charging and recharging loop, and the second ultrasonic generator is used to generate a tiny particle agglomeration effect, increase the diameter of the graphite dust at the inlet of the dust filter, reduce the deposition amount of graphite dust in the charging and recharging loop, and improve the graphite dust capture efficiency of the high temperature gas-cooled reactor.

[0026] Additional aspects and advantages of the present disclosure will be given in part in the following description and in part will be obvious from the following description or learned through practice of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the specific implementation of the present disclosure or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the specific implementation or prior art description. Obviously, the drawings described below are some implementations of the present disclosure. For ordinary technicians in this field, other drawings can also be obtained based on these drawings without creative work. The above and / or additional aspects and advantages of the present disclosure will become obvious and easy to understand from the following description of the embodiments in conjunction with the drawings, in which:

[0028] Figure 1 A schematic diagram of a process for optimizing the capture of graphite dust in a high temperature gas-cooled reactor provided in an embodiment of the present disclosure;

[0029] Figure 2 A schematic diagram of a flow chart of a method for determining an easy deposition area provided in an embodiment of the present disclosure;

[0030] Figure 3 A schematic diagram of arranging an ultrasonic generator on the outer wall of a pipeline provided in an embodiment of the present disclosure;

[0031] Figure 4 A block diagram of a high temperature gas-cooled reactor graphite dust capture optimization system provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0032] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the embodiments of the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the embodiments of the present disclosure as detailed in the appended claims.

[0033] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0034] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood 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 of the features. In the description of the present disclosure, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. It should also be understood that the term "and / or" used in the present disclosure refers to and includes any or all possible combinations of one or more associated listed items.

[0035] Embodiments of the present disclosure are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present disclosure, and should not be construed as limiting the present disclosure.

[0036] The present disclosure provides a high temperature gas-cooled reactor graphite dust capture optimization method and system, the main purpose of which is to improve the high temperature gas-cooled reactor graphite dust capture efficiency by arranging an ultrasonic generator at a specific position.

[0037] In a first embodiment, Figure 1 The following is a flow chart of a method for optimizing the capture of graphite dust in a high temperature gas-cooled reactor provided in an embodiment of the present disclosure. Figure 1 As shown, the high temperature gas-cooled reactor graphite dust capture optimization method comprises the following steps:

[0038] Step S11, obtaining an initial particle deposition rate of a charging and recharging loop of a high temperature gas-cooled reactor, determining an easy deposition area based on the initial particle deposition rate, and installing a first ultrasonic generator on an outer wall of a pipeline in the easy deposition area.

[0039] In this embodiment, the initial particle deposition rate in step S11 is the particle deposition rate before the ultrasonic generator (the first ultrasonic generator and the second ultrasonic generator) is installed or before the installed ultrasonic generator is put into operation.

[0040] 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 0.1-10 μm.

[0041] In some embodiments, the initial particle deposition rate in step S11 can be calculated based on various deposition mechanisms, particle diameters, etc. If it is found that the particle diameters, etc., have changed, the initial particle deposition rate needs to be recalculated.

[0042] Figure 2 Schematic diagram of a method for determining an easy deposition area provided in an embodiment of the present disclosure. In some embodiments, the initial particle deposition rate of the charging and recharging circuit of the high temperature gas-cooled reactor is obtained in step S11, and the easy deposition area is determined based on the initial particle deposition rate, such as Figure 2 As shown, it specifically includes: for graphite dust, selecting a typical part of the charging and recharging loop of the high temperature gas-cooled reactor, the typical part includes multiple areas (step S111); obtaining the initial particle deposition rate of the typical part under the coupling of multiple deposition mechanisms (step S112); arranging the initial particle deposition rates in descending order, and selecting a preset number of initial particle deposition rates in turn (step S113); and using the area corresponding to the preset number of initial particle deposition rates as an easy deposition area (step S114).

[0043] In some embodiments, the refueling loop in step S111 is, for example, a helium loop.

[0044] In some embodiments, the typical locations in step S111 are typical areas such as upstream and downstream of the ball separation device of the loading and unloading loop, upstream and downstream of the baffle, and the lowest end of the loop.

[0045] In some embodiments, the multiple deposition mechanisms in step S112 are, for example, thermophoretic deposition, turbulent deposition and other mechanisms, and the initial particle deposition rate under the coupling effect of multiple mechanisms such as thermophoretic deposition, turbulent deposition and other mechanisms is calculated.

[0046] In some embodiments, the preset number in step S113 may be, for example, 3, that is, the first 3 initial particle deposition rates in the descending sequence are selected. The regions corresponding to the first 3 initial particle deposition rates may be used as easy deposition regions.

[0047] In other embodiments, after the easy deposition area is obtained, the easy deposition area can be adjusted in combination with domestic and foreign experience feedback and actual operation conditions, so as to obtain a more accurate easy deposition location.

[0048] In other embodiments, after obtaining the deposition-prone area, the feasibility of ultrasonic generator arrangement and environmental dose conditions can be verified on-site for the identified deposition-prone area, and finally a suitable location for installing the first ultrasonic generator in the deposition-prone area can be determined.

[0049] In this embodiment, the step S11 of installing the first ultrasonic generator on the outer wall of the pipeline in the deposition-prone area specifically includes installing the first ultrasonic generator on the outer wall of the pipeline at an accessible portion of the deposition-prone area. The accessible portion of the outer wall of the pipeline may refer to a portion that is spatially accessible to personnel or equipment, and a portion that is accessible to personnel or equipment after evaluation of the environmental dose rate during the overhaul.

[0050] In this embodiment, the first ultrasonic generator in step S11 is a general term for ultrasonic generators installed on the outer wall of the pipeline in the deposition-prone area.

[0051] In step S11, the first ultrasonic generator includes a plurality of ultrasonic generators, and when the first ultrasonic generator is installed, the ultrasonic generators are evenly arranged at a preset angle. The preset angle is the angle between adjacent ultrasonic generators. The preset angle is, for example, one of 180°, 120°, and 90°, that is, when the first ultrasonic generator is installed, each ultrasonic generator is evenly arranged on the outer wall of the pipeline at an angle interval of 180°, 120°, or 90°.

[0052] In some embodiments, for graphite dust with a particle size of 0.1 to 10 μm, typical locations such as the upstream and downstream of the ball separation device in the loading and replacement loop, the upstream and downstream of the baffle, and the lowest end of the loop are selected to analyze the initial particle deposition rate under the coupling of multiple mechanisms such as thermophoretic deposition and turbulent deposition, and the top three locations with the highest initial particle deposition rate are selected as easy deposition areas. At the same time, the easy deposition locations can also be adjusted based on the feedback from the operation experience of high-temperature gas-cooled reactors in foreign countries such as Germany and the United States and the actual operation conditions. For the identified locations, the feasibility of the ultrasonic generator layout and the environmental dose conditions are verified on site, and finally the appropriate installation location is determined, where the installation diagram of the first ultrasonic generator can be as shown below: Figure 3 shown.

[0053] Figure 3 This is a schematic diagram of arranging an ultrasonic generator on the outer wall of a pipe provided in an embodiment of the present disclosure. Figure 3As shown, 1 represents a section of high-temperature and high-pressure helium pipeline, and the section of high-temperature and high-pressure helium pipeline 1 is a deposition-prone area of ​​the loading and unloading loop of the high-temperature gas-cooled reactor. A first ultrasonic generator is installed on the outer wall of the pipeline in the deposition-prone area. There are two first ultrasonic generators, namely ultrasonic generator 2 and ultrasonic generator 3. Ultrasonic generator 2 and ultrasonic generator 3 are arranged at an interval of 180° in the circumferential direction of the pipeline. 4 represents a pulse controller, and pulse controller 4 is connected to ultrasonic generator 2 and ultrasonic generator 3 respectively. Pulse controller 4 controls the operation of ultrasonic generator 2 and ultrasonic generator 3 respectively. 5 represents a dust filter.

[0054] Step S12, installing a second ultrasonic generator on the outer wall of the upstream pipeline of the dust filter close to the high temperature gas-cooled reactor.

[0055] In this embodiment, the outer wall of the upstream pipeline close to the dust filter of the high temperature gas-cooled reactor in step S12 is the outer wall of the pipeline at the straight pipe section closest to the dust filter (also called the dust filter) upstream.

[0056] In this embodiment, the second ultrasonic generator in step S12 is a general term for ultrasonic generators installed on the outer wall of the upstream pipeline close to the dust filter of the high temperature gas-cooled reactor.

[0057] In step S12, the second ultrasonic generator includes a plurality of ultrasonic generators, and when the second ultrasonic generator is installed, the ultrasonic generators are evenly arranged at a preset angle. For example, when the second ultrasonic generator is installed, each ultrasonic generator is evenly arranged on the outer wall of the pipeline at an angle interval of 180°, 120° or 90°.

[0058] Step S13, operating the first ultrasonic generator according to a set cycle, and continuously operating the second ultrasonic generator.

[0059] In this embodiment, the operation of the first ultrasonic generator according to the set cycle in step S13 can utilize the acoustic vibration to make the dust (i.e. graphite dust) fall off and continue to circulate with the gas (e.g. helium) in the loading and unloading loop.

[0060] In step S13, the first ultrasonic generator is operated according to the set cycle, including: dividing the set cycle into an operating period and a stop period, starting the first ultrasonic generator in the operating period, and shutting down the first ultrasonic generator in the stop period. The set cycle can be, for example, a period with days, weeks, months, etc. as time units. Thus, the first ultrasonic generator can be started at set cycle intervals. For example, if the set cycle is 1 day and the operating period is 0.5 hours, then after the first ultrasonic generator is arranged, it is set to start for 0.5 hours every day to promote the separation of the deposited graphite dust from the metal pipe wall and re-enter the loading and replacement circuit.

[0061] In this embodiment, the continuous operation of the second ultrasonic generator in step S13 can increase the dust diameter (i.e., the particle size of graphite dust) by utilizing the condensation principle, thereby improving the filtering effect (i.e., the collection efficiency). Specifically, the second ultrasonic generator adjacent to the dust filter is continuously operated, and the proportion of graphite dust particles with a diameter of more than 1 μm is increased by utilizing the condensation principle, thereby improving the efficiency of the dust filter.

[0062] Step S14, obtaining a particle deposition rate change value of graphite dust in an easy deposition area, and adjusting the position and working parameters of the first ultrasonic generator and the second ultrasonic generator based on the particle deposition rate change value.

[0063] In some embodiments, step S14 obtains the deposition condition of graphite dust in the easy-to-deposit area, and adjusts the position and working parameters of the first ultrasonic generator and the second ultrasonic generator based on the deposition condition of the graphite dust.

[0064] In some embodiments, the graphite dust deposition condition includes a particle deposition rate variation value of the graphite dust.

[0065] In some embodiments, in step S14, the change value of the particle deposition rate of graphite dust in the easy deposition area (for example, the accessible part of the easy deposition area) can be obtained through the disassembly window of the material replacement circuit equipment. The change value of the particle deposition rate of graphite dust is the graphite dust deposition rate verification situation.

[0066] In some embodiments, the dismantling window of the loading and unloading circuit equipment is a time window, which refers to the moment when each device in the loading and unloading circuit is preventively dismantled and overhauled. That is, in step S14, the graphite dust deposition on the inner wall of the open pipeline can be checked when each device in the loading and unloading circuit (i.e., the loading and unloading pipeline) is preventively dismantled and overhauled.

[0067] In this embodiment, the change value of the particle deposition rate of the graphite dust in step S14 can be calculated based on the initial particle deposition rate and the particle deposition rates obtained after the first ultrasonic generator and the second ultrasonic generator are operated.

[0068] In this embodiment, the operating parameters of the first ultrasonic generator and the second ultrasonic generator may include but are not limited to the ultrasonic generator frequency, the setting cycle and operating time period of the first ultrasonic generator and other parameters.

[0069] In some embodiments, the graphite dust deposition condition also includes a deposition trend, that is, step S14 can also obtain the deposition trend of the graphite dust in the easy deposition area, and adjust the position 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.

[0070] In some embodiments, the graphite dust deposition conditions may also include graphite dust deposition changes at the openings. Since there are devices on the loading and replacement circuit that need to be disassembled for repair, the openings of these devices after disassembly are the openings.

[0071] In some embodiments, the graphite dust deposition conditions may also include changes in pipeline radiation hot spots, etc.

[0072] 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 review, the graphite dust deposition changes at the opening, the pipeline radiation hotspot changes, etc. Thus, the graphite dust deposition rate review, the graphite dust deposition changes at the opening, the pipeline radiation hotspot changes, etc. can be comprehensively considered for the positions ranked higher after the deposition rate review, the positions with faster deposition in the on-site inspection, the positions with obvious increase in pipeline radiation dose, etc., and the positions of each ultrasonic generator in the existing first ultrasonic generator and the second ultrasonic generator are increased or adjusted to optimize the acoustic oscillation effect. In addition, the ultrasonic generator frequencies of the first ultrasonic generator and the second ultrasonic generator, the setting cycle of the first ultrasonic generator, and the operating time period are adjusted and optimized.

[0073] In some embodiments, when adjusting and optimizing parameters such as the ultrasonic generator frequencies of the first ultrasonic generator and the second ultrasonic generator, the set cycle and operating time period of the first ultrasonic generator, etc., they can also be adjusted and optimized in combination with experimental experience.

[0074] In some embodiments, after the first ultrasonic generator and the second ultrasonic generator are operated, step S14 may also obtain a graphite dust sample, measure the particle size distribution of the graphite dust sample, and correct the initial particle deposition rate in step S11 based on the measurement results.

[0075] In the high temperature gas-cooled reactor graphite dust capture optimization method of the embodiment of the present disclosure, the initial particle deposition rate of the high temperature gas-cooled reactor loading and unloading circuit is obtained, the easy deposition area is determined based on the initial particle deposition rate, and a first ultrasonic generator is installed on the outer wall of the pipeline in the easy deposition area; a second ultrasonic generator is installed on the outer wall of the upstream pipeline near the dust filter of the high temperature gas-cooled reactor; the first ultrasonic generator is operated according to a set cycle, and the second ultrasonic generator is continuously operated; the particle deposition rate change value of the graphite dust in the easy deposition area is obtained, and the position and working parameters of the first ultrasonic generator and the second ultrasonic generator are adjusted based on the particle deposition rate change value. In this case, the principle of ultrasonic oscillation is utilized, and the binding force between the deposited graphite dust and the metal tube wall is destroyed by the running first ultrasonic generator, causing the graphite dust to fall off and re-enter the charging and changing loop, and further filtered through the dust filter along with the gas in the charging and changing loop, thereby reducing the amount and rate of graphite dust deposition in the charging and changing loop. At the same time, the tiny particle agglomeration effect caused by ultrasonic oscillation is utilized, and the tiny particle agglomeration effect is generated by the running second ultrasonic generator, thereby increasing the diameter of graphite dust at the entrance of the dust filter, reducing the amount of graphite dust deposition in the charging and changing loop, and improving the filtration efficiency of the dust filter, thereby improving the graphite dust capture efficiency of the high-temperature gas-cooled reactor. In addition, the method disclosed in the present invention is also applicable to helium environments, and in this case, the method disclosed in the present invention can also be referred to as a graphite dust capture optimization method for helium environments of high-temperature gas-cooled reactors.

[0076] The following are system embodiments of the present disclosure, which can be used to execute the method embodiments of the present disclosure. For details not disclosed in the system embodiments of the present disclosure, please refer to the method embodiments of the present disclosure.

[0077] See also Figure 4 , Figure 4 This is a block diagram of a high temperature gas-cooled reactor graphite dust capture optimization system provided by an embodiment of the present disclosure. The high temperature gas-cooled reactor graphite dust capture optimization system 10 includes an ultrasonic generator module 11, a control module 12 and a processing module 13, wherein:

[0078] The ultrasonic generator module 11 includes a first ultrasonic generator installed on the outer wall of the pipeline in the deposition-prone area and a second ultrasonic generator installed on the outer wall of the upstream pipeline near the dust filter of the high-temperature gas-cooled reactor;

[0079] A control module 12, used to control the operation of the first ultrasonic generator according to a set period, and continuously control the operation of the second ultrasonic generator;

[0080] The processing module 13 is used to obtain the initial particle deposition rate of the loading and unloading loop of the high-temperature gas-cooled reactor before installing the ultrasonic generator module, determine the easy deposition area based on the initial particle deposition rate, obtain the particle deposition rate change value of the graphite dust in the easy deposition area after installing the ultrasonic generator module, and adjust the position and working parameters of the first ultrasonic generator and the second ultrasonic generator based on the particle deposition rate change value.

[0081] Optionally, the control module 12, when used to control the operation of the first ultrasonic generator according to a set cycle, is specifically used to: divide the set cycle into an operation period and a stop period, start the first ultrasonic generator in the operation period, and shut down the first ultrasonic generator in the stop period.

[0082] Optionally, the processing module 13, before the ultrasonic generator module is installed, is specifically used to: for graphite dust, select a typical part of the loading and unloading loop of the high-temperature gas-cooled reactor, the typical part includes multiple areas; obtain the initial particle deposition rate of the typical part under the coupling of multiple deposition mechanisms; arrange the initial particle deposition rates in descending order, and select a preset number of initial particle deposition rates in turn; and use the area corresponding to the preset number of initial particle deposition rates as an easy deposition area.

[0083] Optionally, the processing module 13 is further used to obtain the deposition trend of graphite dust in the deposition-prone area, and adjust the position 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.

[0084] It should be noted that the above explanation of the embodiment of the high temperature gas-cooled reactor graphite dust capture optimization method is also applicable to the high temperature gas-cooled reactor graphite dust capture optimization system of this embodiment, which will not be repeated here.

[0085] In the high temperature gas-cooled reactor graphite dust capture optimization system of the embodiment of the present disclosure, the ultrasonic generator module includes a first ultrasonic generator installed on the outer wall of the pipeline in the easy deposition area and a second ultrasonic generator installed on the outer wall of the upstream pipeline near the dust filter of the high temperature gas-cooled reactor; the control module controls the operation of the first ultrasonic generator according to a set period, and continuously controls the operation of the second ultrasonic generator; the processing module obtains the initial particle deposition rate of the loading and unloading circuit of the high temperature gas-cooled reactor before installing the ultrasonic generator module, determines the easy deposition area based on the initial particle deposition rate, obtains the particle deposition rate change value of the graphite dust in the easy deposition area after installing the ultrasonic generator module, and adjusts the position and working parameters of the first ultrasonic generator and the second ultrasonic generator based on the particle deposition rate change value. In this case, the principle of ultrasonic oscillation is utilized, and the binding force between the deposited graphite dust and the metal tube wall is destroyed by the running first ultrasonic generator, causing the graphite dust to fall off and re-enter the charging and changing loop, and further filtered through the dust filter along with the gas in the charging and changing loop, thereby reducing the amount and rate of graphite dust deposition in the charging and changing loop. At the same time, the tiny particle agglomeration effect caused by ultrasonic oscillation is utilized, and the tiny particle agglomeration effect is generated by the running second ultrasonic generator, thereby increasing the diameter of graphite dust at the entrance of the dust filter, reducing the amount of graphite dust deposition in the charging and changing loop, and improving the filtration efficiency of the dust filter, thereby improving the graphite dust capture efficiency of the high-temperature gas-cooled reactor. In addition, the system disclosed in the present invention is also applicable to helium environments, and in this case, the system disclosed in the present invention can also be called a graphite dust capture optimization system for helium environments of high-temperature gas-cooled reactors.

[0086] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps recorded in this disclosure can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solutions disclosed in this disclosure can be achieved, and this disclosure is not limited here.

[0087] The above specific implementations do not constitute a limitation on the protection scope of the present disclosure. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A high temperature gas-cooled reactor graphite dust capture optimization method, characterized in that: include: Obtaining an initial particle deposition rate of a charging and refueling loop of a high temperature gas-cooled reactor, determining a deposition-prone region based on the initial particle deposition rate, and installing a first ultrasonic generator on an outer wall of a pipeline in the deposition-prone region; A second ultrasonic generator is installed on the outer wall of the upstream pipeline of the dust filter close to the high temperature gas-cooled reactor; Running the first ultrasonic generator according to a set cycle, and continuously running the second ultrasonic generator; Obtaining a particle deposition rate change value of 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; The step of obtaining an initial particle deposition rate of a charging and recharging loop of a high temperature gas-cooled reactor and determining a deposition-prone region based on the initial particle deposition rate comprises: For graphite dust, a typical location of a high temperature gas-cooled reactor refueling circuit is selected, and the typical location includes multiple areas; Obtaining the initial particle deposition rate of the typical location under the coupling of multiple deposition mechanisms; Arrange the initial particle deposition rates in descending order, and select a preset number of initial particle deposition rates in sequence; The area corresponding to the initial particle deposition rate of the preset number is used as the easy deposition area The step of operating the first ultrasonic generator according to a set cycle includes: Dividing the set cycle into an operating period and a stop period, starting the first ultrasonic generator during the operating period, and shutting down the first ultrasonic generator during the stop period; The deposition trend of graphite dust in the easy-to-deposit area is obtained, and the positions and working 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.

2. The high temperature gas-cooled reactor graphite dust capture optimization method according to claim 1, characterized in that: The first ultrasonic generator or the second ultrasonic generator includes a plurality of ultrasonic generators respectively. When the first ultrasonic generator or the second ultrasonic generator is installed, the ultrasonic generators are evenly arranged according to a preset angle.

3. The high temperature gas-cooled reactor graphite dust capture optimization method according to claim 1, characterized in that: Also includes: After the first ultrasonic generator and the second ultrasonic generator are operated, a graphite dust sample is obtained, a particle size distribution of the graphite dust sample is measured, and the initial particle deposition rate is corrected based on the measurement result.

4. A high temperature gas-cooled reactor graphite dust capture optimization system, characterized in that: include: An ultrasonic generator module, the ultrasonic generator module comprising a first ultrasonic generator installed on the outer wall of the pipeline in the deposition-prone area and a second ultrasonic generator installed on the outer wall of the upstream pipeline near the dust filter of the high temperature gas-cooled reactor; A control module, used for controlling the operation of the first ultrasonic generator according to a set period, and continuously controlling the operation of the second ultrasonic generator; a processing module, for obtaining an initial particle deposition rate of a charging and recharging circuit of a high temperature gas-cooled reactor before installing the ultrasonic generator module, determining an easy deposition area based on the initial particle deposition rate, obtaining a particle deposition rate change value of graphite dust in the easy deposition area after installing the ultrasonic generator module, 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; The processing module, before the ultrasonic generator module is installed, is specifically used for: For graphite dust, a typical location of a high temperature gas-cooled reactor refueling circuit is selected, and the typical location includes multiple areas; Obtaining the initial particle deposition rate of the typical location under the coupling of multiple deposition mechanisms; Arrange the initial particle deposition rates in descending order, and select a preset number of initial particle deposition rates in sequence; The area corresponding to the initial particle deposition rate of the preset number is used as an easy deposition area; The control module, when used to control the operation of the first ultrasonic generator according to a set cycle, is specifically used to: Dividing the set cycle into an operating period and a stop period, starting the first ultrasonic generator during the operating period, and shutting down the first ultrasonic generator during the stop period; The processing module is further used to obtain the deposition trend of the graphite dust in the easy-to-deposit area, and adjust the position 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.

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