CN115083641B - Flow-blocking positioning and distributing device applied to pebble-bed type high-temperature reactor - Google Patents
Flow-blocking positioning and distributing device applied to pebble-bed type high-temperature reactor Download PDFInfo
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- CN115083641B CN115083641B CN202210717970.8A CN202210717970A CN115083641B CN 115083641 B CN115083641 B CN 115083641B CN 202210717970 A CN202210717970 A CN 202210717970A CN 115083641 B CN115083641 B CN 115083641B
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C19/00—Arrangements for treating, for handling, or for facilitating the handling of, fuel or other materials which are used within the reactor, e.g. within its pressure vessel
- G21C19/20—Arrangements for introducing objects into the pressure vessel; Arrangements for handling objects within the pressure vessel; Arrangements for removing objects from the pressure vessel
- G21C19/202—Arrangements for handling ball-form, i.e. pebble fuel
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C17/00—Monitoring; Testing ; Maintaining
- G21C17/10—Structural combination of fuel element, control rod, reactor core, or moderator structure with sensitive instruments, e.g. for measuring radioactivity, strain
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C19/00—Arrangements for treating, for handling, or for facilitating the handling of, fuel or other materials which are used within the reactor, e.g. within its pressure vessel
- G21C19/02—Details of handling arrangements
- G21C19/10—Lifting devices or pulling devices adapted for co-operation with fuel elements or with control elements
- G21C19/105—Lifting devices or pulling devices adapted for co-operation with fuel elements or with control elements with grasping or spreading coupling elements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
The invention provides a choked flow positioning and distributing device applied to a pebble bed type high-temperature reactor. The material taking disc is rotatably connected in the box body, and the middle baffle is positioned in the annular groove of the material taking disc. The driving mechanism drives the material taking disc to rotate in the cavity to drive the material taking hole to rotate to be communicated with any one of the ball inlet pipe, the chip collecting pipe, the first ball outlet pipe and the second ball outlet pipe. The invention integrates the serial fuel ball single conveying function, the burnup measuring and positioning function, the fuel ball directional distribution function, the helium choking function and the detritus self-guiding function of the fuel loading and unloading system, and solves the problems of large equipment quantity and large space occupation rate of the pebble-bed type high-temperature reactor fuel loading and unloading system.
Description
Technical Field
The invention relates to the technical field of reactor engineering, in particular to a choked flow positioning and distributing device applied to a pebble-bed type high-temperature reactor.
Background
The pebble-bed high-temperature gas cooled reactor is an advanced nuclear reactor with good inherent safety, can be used for high-efficiency power generation and high-temperature heat supply, and is one of the first-choice reactor types in the fourth generation nuclear energy system in the international nuclear energy field. The fuel loading and unloading system is used as an online refueling system of the high-temperature gas cooled reactor and is a key system for ensuring long-term safe and stable operation of the high-temperature reactor, so that the continuous operation capacity of the fuel loading and unloading system directly determines the safe operation level of the high-temperature reactor. The high temperature gas cooled reactor adopts spherical fuel element with graphite as matrix and has the characteristic of brittleness and hardness. During the transmission process of the fuel elements, dust and fragments are extremely easy to generate due to friction and collision between the balls and steel materials, so that fuel damage and equipment blockage faults are caused. Therefore, it is necessary to integrate and simplify the equipment of the fuel handling system that performs some critical functions, so as to shorten the fuel transfer path, reduce the potential collision probability, further improve the structural integrity of the fuel element and the reliability of the fuel handling system, and ensure long-term safe and stable operation of the reactor.
In the normal operation process of the fuel loading and unloading system, the functions of burnup measurement, directional distribution and helium choking of the off-stack fuel elements are required to be executed, and at present, the functions are executed in a plurality of types of equipment in the main stream of the ball bed type high-temperature stacks at home and abroad, and the system is required to provide sufficient installation space and maintenance space in arrangement, so that a fuel transmission path is long; and the fuel ball blocking problem faced by the operation of the fuel elements in helium, dust and debris environments is not fully considered in the devices designed by the stacks, and great challenges are brought to the operation of the system and the maintenance of the devices in the strong radioactive environments. Therefore, developing the integrated design of the equipment and solving the problem of ball jamming caused by scraps has important significance for safe operation and popularization of the high-temperature stack.
Disclosure of Invention
The invention aims to provide a flow blocking positioning and distributing device which is highly integrated, simple in structure and high in reliability and is applied to a pebble-bed type high-temperature reactor, and a series of problems of multiple devices, low chip compatibility, frequent blocking of the devices, difficult maintenance of the devices in a high-radioactivity environment and the like of a fuel loading and unloading system in the prior art are overcome.
The embodiment of the application provides a choked flow positioning and distributing device applied to a pebble-bed type high-temperature reactor, which comprises: the box, get material dish and middle baffle, form the columnar cavity that is used for installing and gets material dish and middle baffle in the box, the connection case lid can be dismantled to the box upper end, and the advance bulb of intercommunication cavity has been seted up to the case lid upper end, and the bits pipe, first play bulb and second play bulb have been seted up to the box lower extreme, and a measuring tank has been seted up in the outside of box.
The material taking disc is rotatably connected in the cavity, an annular groove for installing the middle baffle is transversely formed in the middle position of the material taking disc, a material taking hole is longitudinally formed in the material taking disc in a penetrating mode, one end of the material taking disc is connected with the output end of the driving mechanism, the driving mechanism drives the material taking disc to rotate in the cavity, and the material taking hole is driven to rotate to be communicated with any one of the ball inlet pipe, the chip collecting pipe, the first ball outlet pipe and the second ball outlet pipe.
The middle baffle is horizontally and fixedly arranged at the middle position in the cavity, the middle baffle is positioned in an annular groove of the material taking disc, the contact surface between the material taking disc and the middle baffle is a smooth surface, the middle baffle is longitudinally provided with a ball passing through hole and a chip flow guiding port, the chip flow guiding port is positioned right above the chip collecting pipe, the ball passing through hole is positioned close to the measuring groove, the aperture of the ball passing through hole is equal to the aperture of the material taking hole, and the material taking disc is communicated with the ball passing through hole or the chip flow guiding port by rotating.
The invention integrates the serial fuel ball single conveying function, the burnup measuring and positioning function, the fuel ball directional distribution function, the helium choking function and the detritus self-guiding function of the fuel loading and unloading system, and solves the problems of large equipment quantity and large space occupation rate of the pebble-bed type high-temperature reactor fuel loading and unloading system.
According to the invention, the problem of frequent blockage of the fuel ball transportation in the debris environment is solved by arranging the debris diversion holes, the reliability of the fuel loading and unloading system equipment is greatly improved, the usability and economic benefit of the pebble-bed high-temperature gas cooled reactor nuclear power unit are improved, and the internal irradiation and external irradiation risks brought by overhauling the existing equipment in a strong radioactive environment after blockage are reduced.
In some embodiments, the ball passing through hole and the debris flow port are located on opposite sides of the intermediate baffle.
In some embodiments, an upper bearing seat and a lower bearing seat are installed in the box body, the upper part of the rotating shaft is installed in the upper bearing seat through a first bearing, the lower end of the rotating shaft is installed in the lower bearing seat through a second bearing, and the upper end of the rotating shaft is connected with the output end of the driving mechanism.
In some embodiments, the debris flow vent is a grating hole having a smaller diameter than the diameter of the fuel sphere.
In some embodiments, the chip collecting pipe is of a funnel-shaped structure, and the pipe diameter of the upper end of the chip collecting pipe is larger than the diameter of the fuel ball.
In some embodiments, the chip collecting pipe is located right below the ball inlet pipe, and the axial line of the chip collecting pipe is collinear with the axial line of the ball inlet pipe.
In some embodiments, the take off tray includes an upper tray and a lower tray, each having a thickness slightly greater than the diameter of the fuel sphere.
In some embodiments, an annular limiting groove is formed in the bottom of the cavity, a stop block is fixed in the limiting groove, a limiting pin is fixed at the bottom of the material taking disc, the limiting pin is driven to slide along the limiting groove when the material taking disc rotates, and the rotation stops when the limiting pin rotates to touch the stop block.
In some embodiments, the measuring groove is located on one side of the lower turntable.
In some embodiments, an annular sealing structure is arranged between the bottom of the cavity and the bottom of the material taking disc, and the material taking disc is in sliding sealing fit with the cavity.
The working principle of the device is as follows:
singulation delivery function: in the initial state, the upper material taking hole of the material taking disc is coaxially communicated with the ball inlet pipe, and the material taking disc is positioned at the ball receiving position; after the fuel ball enters the upper material taking hole, the material taking disc rotates for a certain angle, the fuel ball entering the upper material taking hole can be rotated to the ball feeding through hole, and the fuel ball falls into the lower material taking hole from the ball feeding through hole. At the same time, the upstream series of fuel pellets are separated by the top surface of the upper turntable. Thereby completing the single conveying function of the fuel balls.
Burnup measurement positioning function: after the material taking disc rotates by a preset angle, the upper material taking hole is coaxially communicated with the ball passing through hole of the middle baffle, the upper rotary disc of the material taking disc is positioned at a volleyball position, and the lower rotary disc is positioned at a ball receiving position. The fuel ball of the upper material taking hole enters the lower material taking hole from the ball passing through hole by gravity. The side of the box body is provided with a measuring groove, and the axis of the measuring groove is perpendicularly intersected with the axis of the ball passing through hole of the middle baffle. When the fuel ball enters the lower material taking hole of the material taking disc through the ball passing through hole of the middle baffle plate, the axis of the measuring groove of the box body is intersected with the ball center of the fuel ball, the material taking disc stops rotating at the moment, and the fuel consumption measuring device arranged outside is aligned with the measuring groove, so that the fuel consumption measurement of the fuel ball can be realized.
Directional allocation function: the fuel consumption measuring device is connected with the driving mechanism through the driving mechanism controller, the driving mechanism controller sends a measuring result to the driving mechanism controller after the fuel consumption measurement is completed, the driving mechanism controller controls the rotation angle of the driving mechanism according to the measuring result to drive the material taking disc to rotate, and the spherical fuel balls can be discharged to the first ball outlet pipe or the second ball outlet pipe, so that the directional distribution of the fuel balls is realized. The first ball outlet pipe receives fuel balls which are burnt out, the second ball outlet pipe receives fuel balls which are not burnt out, and the functions of the first ball outlet pipe and the second ball outlet pipe can be interchanged.
Gas choke function: the material taking disc and the bottom of the box body are provided with a certain fit clearance, so that the flow blocking function of gas is realized. Preferably, an annular sealing structure is arranged between the bottom of the cavity and the bottom of the material taking disc, the material taking disc is in sliding sealing fit with the cavity, and a good flow blocking effect is achieved by increasing local resistance.
The beneficial effects of the invention are as follows:
(1) The invention integrates the serial fuel ball single conveying function, the burnup measuring and positioning function, the fuel ball directional distribution function, the helium choking function and the detritus self-guiding function of the fuel loading and unloading system, and solves the problems of large equipment quantity and large space occupation rate of the pebble-bed type high-temperature reactor fuel loading and unloading system.
(2) According to the invention, the problem of frequent blockage of the fuel ball transportation in the debris environment is solved by arranging the debris diversion holes, the reliability of the fuel loading and unloading system equipment is greatly improved, the usability and economic benefit of the pebble-bed high-temperature gas cooled reactor nuclear power unit are improved, and the internal irradiation and external irradiation risks brought by overhauling the existing equipment in a strong radioactive environment after blockage are reduced.
Drawings
The foregoing and/or additional aspects and advantages of the present invention will become apparent and may be better understood from the following description of embodiments with reference to the accompanying drawings,
wherein:
FIG. 1 is a schematic diagram of the outline structure of a flow blocking positioning and distributing device applied to a pebble-bed type high-temperature reactor in an embodiment of the invention;
FIG. 2 is a schematic view of the outline structure of the bottom view angle of the flow blocking positioning and distributing device applied to the pebble bed type high temperature reactor according to the embodiment of the invention;
FIG. 3 is a longitudinal cross-sectional view of a flow-blocking positioning distribution device applied to a pebble-bed thermopile in accordance with an embodiment of the present invention;
FIGS. 4 and 5 are schematic views showing assembly of components in the case according to the embodiment of the present invention;
FIG. 6 is a schematic view of the structure of the case in FIG. 1;
FIG. 7 is a top view of the case;
FIG. 8 is a perspective cross-sectional view of the case;
FIG. 9 is a schematic view of the cover of FIG. 1;
FIG. 10 is a schematic view of the take off tray of FIG. 4;
FIG. 11 is a perspective cross-sectional view of the take-off tray;
FIG. 12 is a schematic view of the structure of the bottom of the take off tray;
FIG. 13 is a schematic view of the intermediate baffle of FIG. 4;
reference numerals:
1-a driving mechanism; 2-ball inlet pipe; 3-case cover; 4, a box body; 5-a chip collecting pipe; 6-a second ball outlet pipe; 7-a first ball outlet pipe; 8-an upper turntable; 9-measuring grooves; 10-ball passing through holes; 11-a lower turntable; 12-a first bearing; 13-a ball inlet; 14-feeding a material hole; 15-a debris flow port; 16-a lower material taking hole; 17-a second bearing; 18-an intermediate baffle; 19-a rotating shaft; 20-an upper bearing seat; 21-an annular groove; 22-bolts; 23-lower bearing pedestal.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
The following describes a flow blocking positioning distribution device applied to a pebble-bed type high-temperature reactor according to an embodiment of the present invention with reference to the accompanying drawings.
As shown in fig. 1 and 2, an embodiment of the present application provides a flow blocking positioning and distributing device applied to a pebble-bed high-temperature reactor, which includes: the novel automatic feeding device comprises a box body 4, a material taking disc, a middle baffle 18 and a driving mechanism 1, wherein a columnar cavity for installing the material taking disc and the middle baffle 18 is formed in the box body 4, the upper end of the box body 4 is detachably connected with a box cover 3, as shown in fig. 9, the upper end of the box cover 3 is provided with a ball inlet pipe 2 communicated with the cavity, as shown in fig. 6-8, the lower end of the box body 4 is provided with a chip collecting pipe 5, a first ball outlet pipe 7 and a second ball outlet pipe 6, the chip collecting pipe 5 is located on one side of the box body 4, and the first ball outlet pipe 7 and the second ball outlet pipe 6 are located on the other side of the box body 4 together. A measuring groove 9 is arranged on the outer side of the box body 4. The chip collecting pipe 5 is positioned under the ball inlet pipe 2, and the axial lead of the chip collecting pipe 5 is collinear with the axial lead of the ball inlet pipe 2.
As shown in fig. 3 and 4, an upper bearing seat 20 is installed above the cavity, a first bearing 12 is installed in the upper bearing seat 20, a lower bearing seat 23 is installed below the cavity, and a second bearing 17 is installed in the lower bearing seat 23. The first bearing 12 and the second bearing 17 are used to mount take off trays. The upper bearing seat 20 is provided with a ball inlet hole 13, the ball inlet hole 13 is communicated with the ball inlet pipe 2, the ball inlet hole 13 is collinear with the axial lead of the ball inlet pipe 2, and the aperture of the ball inlet hole 13 is equal to the aperture of the ball inlet pipe 2.
As shown in fig. 4, the material taking disc is connected to the cavity through a rotating shaft 19, the upper part of the rotating shaft 19 is installed in an upper bearing seat 20 through a first bearing 12, the lower end of the rotating shaft 19 is installed in a lower bearing seat 23 through a second bearing 17, the upper end of the rotating shaft 19 is connected to the output end of the driving mechanism 1 through a straight key or spline, and the driving mechanism 1 drives the material taking disc to rotate in the cavity. The driving mechanism 1 is in sealing connection with the box cover 3, and the box cover 3 is in sealing connection with the box body 4.
As shown in fig. 10 to 12, the material taking tray is provided with an annular groove 21 near the middle position from the transverse direction, so as to form a double-turntable structure, and the annular groove 21 is used for installing the middle baffle 18, so as to provide an installation space for the middle baffle 18. The annular groove 21 divides the material taking disc into an upper rotary disc 8 and a lower rotary disc 11, the material taking disc is longitudinally provided with a material taking hole in a penetrating way, the material taking hole is divided into an upper material taking hole 14 and a lower material taking hole 16 by the annular groove 21, and the axial leads of the upper material taking hole 14 and the lower material taking hole 16 are collinear. As the take off pan rotates, the upper take off apertures 14 and lower take off apertures 16 also rotate simultaneously therewith.
The driving mechanism 1 drives the material taking disc to rotate and further drives the material taking hole to rotate to be communicated with any one of the ball inlet pipe 2, the chip collecting pipe 5, the first ball outlet pipe 7 and the second ball outlet pipe 6. The upper disc 8 and the lower disc 11 are of equal thickness and are both slightly larger than the diameter of the fuel sphere. So that the material taking hole accommodates a fuel ball.
In some specific embodiments, the thickness of the upper disc 8 and the lower disc 11 is greater than 1mm of the diameter of the fuel sphere.
The middle baffle 18 is horizontally and fixedly installed in the cavity near the middle position, and as shown in fig. 13, the middle baffle 18 is of a disc type structure and is a static piece. The intermediate baffle 18 is located in an annular groove 21 of the take-off tray, and the contact surface between the take-off tray and the intermediate baffle 18 is a smooth surface, so that the take-off tray can rotate along the intermediate baffle 18. The middle baffle 18 is longitudinally provided with a ball passing through hole 10 and a chip guide opening 15, the chip guide opening 15 is positioned right above the chip collecting pipe 5, the ball passing through hole 10 is positioned close to the measuring groove 9, the aperture of the ball passing through hole 10 is equal to that of the material taking hole, and the material taking disc enables the material taking hole to be communicated with the ball passing through hole 10 or the chip guide opening 15 through rotation.
In some embodiments, the ball passing holes 10 and the chip flow guide 15 are located on opposite sides of the intermediate baffle 18, respectively, i.e., the ball passing holes 10 and the chip flow guide 15 are disposed 180 °.
In some particular embodiments, as shown in fig. 5, the intermediate baffle 18 is secured to the interior of the tank 4 by bolts 22 or screws or other means. Specifically, a circle of screw holes are formed in the edge of the middle baffle 18, the cavity is a stepped cavity, two layers of annular steps are formed in the inner wall of the cavity, and the middle baffle 18 is fixed to the upper end of the annular step of the lower layer through bolts 22. The upper end of the box body 4 is detachably connected with the box cover 3 through bolts. The upper bearing seat 20 is fixedly connected to the upper annular step end of the upper layer of the inner cavity of the box body 4 through bolts 22.
In some specific embodiments, the debris flow vents 15 are grating holes having a smaller diameter than the diameter of the fuel sphere. The fuel ball can enter the upper material taking hole 14 from the ball inlet pipe 2, then the scraps can fall into the lower material taking hole 16 through the grid holes by means of self gravity, finally fall into the scrap collecting pipe 5 and are discharged, and therefore the scrap self-guiding function is achieved.
In some specific embodiments, the chip collecting tube 5 is in a funnel-shaped structure, and the tube diameter of the upper end of the chip collecting tube 5 is larger than the diameter of the fuel ball so as to collect chips to a larger extent.
In some embodiments, the inlets of the upper and lower take out holes 14, 16 of the take out pan are rounded to avoid damage to the fuel ball caused by rubbing during the ball take out process.
In some specific embodiments, an annular limiting groove is formed in the bottom of the cavity, a stop block is fixed in the limiting groove, a limiting pin is fixed at the bottom of the material taking disc, the limiting pin is driven to slide along the limiting groove when the material taking disc rotates, and the rotation stops when the limiting pin rotates to touch the stop block. Ensuring the accurate rotation and periodic change of the material taking disc in a controllable range.
In some specific embodiments, the inner diameters of the ball inlet pipe 2, the ball inlet hole 13, the upper material outlet hole 14, the lower material outlet hole 16, the first ball outlet pipe 7 and the second ball outlet pipe 6 are the same, and are 2-4 mm larger than the diameter of the fuel ball.
In some specific embodiments, the measuring groove 9 is located on one side of the lower turntable 11. At the moment when the fuel ball falls from the ball passing through hole 10 of the middle rotary table to the lower material taking hole 16, the distance between the measuring groove 9 and the fuel ball is nearest, which is more beneficial to measuring the fuel ball burn-up.
In some specific embodiments, a cask is provided downstream of the chip-collecting duct 5 for storing graphite dust and debris discharged from the upstream chip-collecting duct 5.
The invention is further described below by means of specific examples.
Example 1
As shown in fig. 1, a choked flow positioning and distributing device applied to a pebble-bed type high-temperature reactor comprises: the box body 4, the material taking disc, the middle baffle 18 and the driving mechanism 1 are arranged in the box body 4 to form a cavity, the cavity is cylindrical, the material taking disc, the middle baffle 18 and matched components are arranged in the cavity, and the upper end of the box body 4 is detachably connected with the box cover 3. The upper end of the case cover 3 is provided with a ball inlet pipe 2 communicated with the cavity. The driving mechanism 1 is arranged at the center of the upper end of the box cover 3 and is used for driving the material taking disc in the box body 4 to rotate. The chip collecting pipe 5, the first ball outlet pipe 7 and the second ball outlet pipe 6 are arranged at the lower end of the box body 4, the chip collecting pipe 5 is used for discharging graphite dust and scraps, and the first ball outlet pipe 7 and the second ball outlet pipe 6 are used for discharging fuel balls after the dust and scraps are removed. The outside of the box 4 is provided with a measuring groove 9 for measuring the fuel ball falling into the box, so as to realize the directional distribution function of the fuel ball, and if the fuel ball is burnt out, the fuel ball is discharged from the first ball outlet pipe 7, and if the fuel ball is not burnt out, the fuel ball is discharged from the second ball outlet pipe 6.
As shown in fig. 2, the lower end of the box body 4 is provided with a chip collecting pipe 5, a first ball outlet pipe 7 and a second ball outlet pipe 6, the chip collecting pipe 5 is positioned on one side of the box body 4, and the first ball outlet pipe 7 and the second ball outlet pipe 6 are jointly positioned on the other side of the box body 4. The chip collecting pipe 5 is positioned under the ball inlet pipe 2, and the axial lead of the chip collecting pipe 5 is collinear with the axial lead of the ball inlet pipe 2.
As shown in fig. 3 and 4, an upper bearing seat 20 is installed above the cavity, a first bearing 12 is installed in the upper bearing seat 20, a lower bearing seat 23 is installed below the cavity, and a second bearing 17 is installed in the lower bearing seat 23. The first bearing 12 and the second bearing 17 are used to mount take off trays. The upper bearing seat 20 is provided with a ball inlet hole 13, the ball inlet hole 13 is communicated with the ball inlet pipe 2, the ball inlet hole 13 is collinear with the axial lead of the ball inlet pipe 2, and the aperture of the ball inlet hole 13 is equal to the aperture of the ball inlet pipe 2. The material taking disc is connected in the cavity through a rotating shaft 19, the upper part of the rotating shaft 19 is installed in an upper bearing seat 20 through a first bearing 12, the lower end of the rotating shaft 19 is installed in a lower bearing seat 23 through a second bearing 17, the upper end of the rotating shaft 19 is connected with the output end of the driving mechanism 1 through a straight key or a spline, and the driving mechanism 1 drives the material taking disc to rotate in the cavity. The driving mechanism 1 is in sealing connection with the box cover 3, and the box cover 3 is in sealing connection with the box body 4. The middle baffle 18 is horizontally and fixedly arranged at a position close to the middle in the cavity, the middle baffle 18 is longitudinally provided with a ball passing through hole 10 and a chip guide opening 15, the chip guide opening 15 is positioned right above the chip collecting pipe 5, the ball passing through hole 10 is positioned close to the measuring groove 9, the aperture of the ball passing through hole 10 is equal to that of the material taking hole, and the material taking disc enables the material taking hole to be communicated with the ball passing through hole 10 or the chip guide opening 15 through rotation. The inner diameters of the ball inlet pipe 2, the ball inlet hole 13, the upper material outlet hole 14, the lower material outlet hole 16, the first ball outlet pipe 7 and the second ball outlet pipe 6 are the same, and are 2-4 mm larger than the diameter of the fuel ball. The measuring groove 9 is located on one side of the lower turntable 11. At the moment when the fuel ball falls from the ball passing through hole 10 of the middle rotary table to the lower material taking hole 16, the distance between the measuring groove 9 and the fuel ball is nearest, which is more beneficial to measuring the fuel ball burn-up. After the fuel consumption measurement is completed, the fuel consumption measurement device sends the measurement result to the driving mechanism controller, and the driving mechanism controller controls the rotation angle of the driving mechanism 1 according to the measurement result to drive the material taking disc to rotate, so that the spherical fuel balls can be discharged to the first ball outlet pipe 7 or the second ball outlet pipe 6, and the directional distribution of the fuel balls is realized. The driving mechanism 1 drives the material taking disc to rotate and further drives the material taking hole to rotate to be communicated with any one of the ball inlet pipe 2, the chip collecting pipe 5, the first ball outlet pipe 7 and the second ball outlet pipe 6. The chip collecting pipe 5 is of a funnel-shaped structure, and the pipe diameter of the upper end of the chip collecting pipe 5 is larger than the diameter of the fuel ball so as to collect chips in a larger range.
As shown in fig. 5, the intermediate baffle 18 is secured to the interior of the tank 4 by bolts 22 or screws or other means. Specifically, a circle of screw holes are formed in the edge of the middle baffle 18, the cavity is a stepped cavity, two layers of annular steps are formed in the inner wall of the cavity, and the middle baffle 18 is fixed to the upper end of the annular step of the lower layer through bolts 22. The upper end of the box body 4 is detachably connected with the box cover 3 through bolts. The upper bearing seat 20 is fixedly connected to the upper annular step end of the upper layer of the inner cavity of the box body 4 through bolts 22.
As shown in fig. 6, a cavity is formed inside the case 4, and a circle of screw holes are formed at the edge of the upper end of the case 4 for installing the case cover 3. The inner wall of the cavity is provided with two layers of annular steps for mounting the middle baffle 18 and the upper bearing seat 20.
As shown in fig. 7, a lower bearing housing 23 is provided at the bottom center of the case 4 for mounting the second bearing 17. The bottom of the box body 4 is connected with a chip collecting pipe 5, a first ball outlet pipe 7 and a second ball outlet pipe 6, the chip collecting pipe 5 is positioned on one side of the box body 4, and the first ball outlet pipe 7 and the second ball outlet pipe 6 are jointly positioned on the other side of the box body 4.
As shown in fig. 8, the inner wall of the chamber is provided with two annular steps for mounting the intermediate baffle 18 and the upper bearing housing 20.
As shown in fig. 9, the upper end of the case cover 3 is provided with a ball inlet pipe 2 communicated with the cavity, the center of the case cover is provided with a shaft hole, a circle of screw holes are arranged along the edge of the case cover, and the case cover 3 can be fixedly arranged at the upper end of the case body 4 through bolts.
As shown in fig. 10 to 12, the material taking tray is provided with an annular groove 21 near the middle position from the transverse direction, so as to form a double-turntable structure, and the annular groove 21 is used for installing the middle baffle 18, so as to provide an installation space for the middle baffle 18. The annular groove 21 divides the material taking disc into an upper rotary disc 8 and a lower rotary disc 11, the material taking disc is longitudinally provided with a material taking hole in a penetrating way, the material taking hole is divided into an upper material taking hole 14 and a lower material taking hole 16 by the annular groove 21, and the axial leads of the upper material taking hole 14 and the lower material taking hole 16 are collinear. As the take off pan rotates, the upper take off apertures 14 and lower take off apertures 16 also rotate simultaneously therewith. The upper turntable 8 and the lower turntable 11 have equal thickness and are both slightly larger than the diameter of the fuel sphere by 1mm. So that the material taking hole accommodates a fuel ball. The inlets of the upper material taking hole 14 and the lower material taking hole 16 of the material taking disc are subjected to chamfering treatment so as to avoid damage to the fuel ball caused by scratch and scratch in the ball taking process.
As shown in fig. 13, the intermediate baffle 18 is a disk-like structure and is a stationary member. The intermediate baffle 18 is located in an annular groove 21 of the take-off tray, and the contact surface between the take-off tray and the intermediate baffle 18 is a smooth surface, so that the take-off tray can rotate along the intermediate baffle 18. The through ball hole 10 and the chip flow guide 15 are respectively positioned at two opposite sides of the middle baffle 18, namely, the through ball hole 10 and the chip flow guide 15 are arranged at 180 degrees. The debris flow port 15 is a grating hole having a smaller diameter than the diameter of the fuel sphere, but allowing dust or debris to pass through. The fuel ball can enter the upper material taking hole 14 from the ball inlet pipe 2, then dust or scraps can fall into the lower material taking hole 16 through the grid holes by means of self gravity, finally fall into the scrap collecting pipe 5 to be discharged, and the scrap self-guiding function is realized.
In addition, annular spacing groove can also be offered to the cavity bottom, and a dog is fixed in the spacing groove, and the charging tray bottom is fixed with the spacer pin, drives the spacer pin and slides along the spacing groove when the charging tray rotates, rotates to when touching with the dog and stops rotating. Ensuring the accurate rotation and periodic change of the material taking disc in a controllable range.
The lower end of the chip collecting pipe 5 is provided with a shielding tank for storing graphite dust and chips discharged from the upstream chip collecting pipe 5.
The working principle of the device is as follows:
singulation delivery function: in the initial state, the upper material taking hole 14 of the material taking disc is coaxially communicated with the ball inlet pipe 2, and the material taking disc is positioned at a ball receiving position; after the fuel ball enters the upper material taking hole 14, the material taking disc rotates by a certain angle, the fuel ball entering the upper material taking hole 14 can be rotated to the ball feeding through hole, and the fuel ball falls into the lower material taking hole 16 from the ball feeding through hole. At the same time, the upstream series of fuel pellets is separated by the top surface of the upper turntable 8. Thereby completing the single conveying function of the fuel balls.
Burnup measurement positioning function: after the material taking disc rotates 180 degrees (preset angle), the upper material taking hole 14 is coaxially communicated with the ball passing through hole 10 of the middle baffle 18, the upper rotary disc 8 of the material taking disc is positioned at a volleyball position, and the lower rotary disc 11 is positioned at a ball receiving position. The fuel ball of the upper take-off hole 14 enters the lower take-off hole 16 from the ball passing through hole 10 by gravity. The side of the box body 4 is provided with a measuring groove 9, and the axis of the measuring groove 9 is perpendicularly intersected with the axis of the ball passing through hole 10 of the middle baffle 18. When the fuel ball enters the lower material taking hole 16 of the material taking disc through the ball passing through hole 10 of the middle baffle 18, the axis of the measuring groove 9 of the box body 4 is intersected with the ball center of the fuel ball, the material taking disc stops rotating at the moment, and the fuel ball can be burnt and measured by using the external fuel consumption measuring device to align with the measuring groove 9.
Directional allocation function: the fuel consumption measuring device is connected with the driving mechanism 1 through the driving mechanism controller, the driving mechanism controller sends a measuring result to the driving mechanism controller after the fuel consumption measurement is completed, the driving mechanism controller controls the rotation angle of the driving mechanism 1 according to the measuring result to drive the material taking disc to rotate, and the spherical fuel balls can be discharged to the first ball outlet pipe 7 or the second ball outlet pipe 6, so that the directional distribution of the fuel balls is realized. The first ball outlet pipe 7 receives fuel balls which are burnt out, the second ball outlet pipe 6 receives fuel balls which are not burnt out, and the functions of the two balls can be interchanged.
Gas choke function: and a certain fit clearance is arranged between the material taking disc and the bottom of the box body 4, so that the flow blocking function of gas is realized. Preferably, an annular sealing structure is arranged between the bottom of the cavity and the bottom of the material taking disc, the material taking disc is in sliding sealing fit with the cavity, and a good flow blocking effect is achieved by increasing local resistance.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
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 invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
For purposes of this disclosure, the terms "one embodiment," "some embodiments," "example," "a particular 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 invention. 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.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (10)
1. The utility model provides a be applied to ball bed formula high temperature heap choked flow location distribution device which characterized in that includes:
the box body is internally provided with a columnar cavity for installing the material taking disc and the middle baffle, the upper end of the box body is detachably connected with the box cover, the upper end of the box cover is provided with a ball inlet pipe communicated with the cavity, the lower end of the box body is provided with a chip collecting pipe, a first ball outlet pipe and a second ball outlet pipe, and the outer side of the box body is provided with a measuring groove;
the material taking disc is rotatably connected in the cavity, an annular groove for installing the middle baffle is transversely formed in the material taking disc near the middle position, a material taking hole is formed in the material taking disc in a penetrating mode in the longitudinal direction, one end of the material taking disc is connected with the output end of the driving mechanism, the driving mechanism drives the material taking disc to rotate in the cavity, and the material taking hole is driven to rotate to be communicated with any one of the ball inlet pipe, the chip collecting pipe, the first ball outlet pipe and the second ball outlet pipe;
the middle baffle is horizontally and fixedly arranged at a middle position in the cavity, the middle baffle is positioned in an annular groove of the material taking disc, a contact surface between the material taking disc and the middle baffle is a smooth surface, the middle baffle is longitudinally provided with a ball passing through hole and a chip diversion opening, the chip diversion opening is positioned right above the chip collecting pipe, the ball passing through hole is positioned close to the measuring groove, the aperture of the ball passing through hole is equal to the aperture of the material taking hole, and the material taking disc enables the material taking hole to be communicated with the ball passing through hole or the chip diversion opening through rotation.
2. The flow-blocking positioning distribution device for the pebble-bed type high-temperature reactor according to claim 1, wherein the passing through holes and the scraps flow-guiding openings are respectively positioned at two opposite sides of the middle baffle plate.
3. The choked flow positioning and distributing device for the pebble-bed type high-temperature reactor according to claim 1, wherein an upper bearing seat and a lower bearing seat are arranged in the box body, the upper part of the rotating shaft is arranged in the upper bearing seat through a first bearing, the lower end of the rotating shaft is arranged in the lower bearing seat through a second bearing, and the upper end of the rotating shaft is connected with the output end of the driving mechanism.
4. The flow-blocking positioning distribution device applied to a pebble-bed type high-temperature reactor according to claim 1, wherein the debris flow-guiding port is a grating hole, and the aperture of the grating hole is smaller than the diameter of the fuel pebble.
5. The choked flow positioning and distributing device applied to a pebble bed type high-temperature reactor according to claim 1, wherein the chip collecting tube is of a funnel-shaped structure, and the diameter of the upper end of the chip collecting tube is larger than that of a fuel pebble.
6. The flow-blocking positioning and distributing device for a pebble-bed type high-temperature reactor according to any one of claims 1 to 5, wherein the chip collecting pipe is positioned right below the ball inlet pipe, and the axial lead of the chip collecting pipe is collinear with the axial lead of the ball inlet pipe.
7. The flow-blocking positioning distribution device for the pebble-bed type high-temperature reactor according to claim 1, wherein the material taking disc comprises an upper rotary disc and a lower rotary disc, and the thicknesses of the upper rotary disc and the lower rotary disc are slightly larger than the diameter of the fuel pebbles.
8. The choked flow positioning and distributing device applied to the pebble-bed type high-temperature reactor according to claim 1, wherein an annular limiting groove is formed in the bottom of the cavity, a stop block is fixed in the limiting groove, a limiting pin is fixed at the bottom of the material taking disc, the limiting pin is driven to slide along the limiting groove when the material taking disc rotates, and the rotation stops when the limiting pin rotates to touch the stop block.
9. The flow blocking positioning and distributing device for a pebble bed type high temperature reactor according to claim 1, wherein the measuring groove is located at one side of the lower turntable.
10. The choked flow positioning and distributing device for the pebble-bed type high-temperature reactor according to claim 1, wherein an annular sealing structure is arranged between the bottom of the cavity and the bottom of the material taking disc, and the material taking disc is in sliding sealing fit with the cavity.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210717970.8A CN115083641B (en) | 2022-06-21 | 2022-06-21 | Flow-blocking positioning and distributing device applied to pebble-bed type high-temperature reactor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210717970.8A CN115083641B (en) | 2022-06-21 | 2022-06-21 | Flow-blocking positioning and distributing device applied to pebble-bed type high-temperature reactor |
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| CN115083641A CN115083641A (en) | 2022-09-20 |
| CN115083641B true CN115083641B (en) | 2023-05-16 |
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| CN103474113A (en) * | 2013-09-30 | 2013-12-25 | 清华大学 | Pebble-bed module type high-temperature gas cooled reactor fuel loading and unloading system |
| CN103761999A (en) * | 2014-01-24 | 2014-04-30 | 清华大学 | Crossroad device for high-temperature gas cooled reactor |
| JP2018527562A (en) * | 2015-12-31 | 2018-09-20 | 清華大学Ｔｓｉｎｇｈｕａ Ｕｎｉｖｅｒｓｉｔｙ | Spent fuel negative pressure unloading system for nuclear power plants |
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| CN115083641A (en) | 2022-09-20 |
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