CN117497207A - Flow dividing device and high-temperature gas cooled reactor shutdown system - Google Patents
Flow dividing device and high-temperature gas cooled reactor shutdown system Download PDFInfo
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- CN117497207A CN117497207A CN202311194122.4A CN202311194122A CN117497207A CN 117497207 A CN117497207 A CN 117497207A CN 202311194122 A CN202311194122 A CN 202311194122A CN 117497207 A CN117497207 A CN 117497207A
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- 230000007246 mechanism Effects 0.000 claims abstract description 86
- 238000007789 sealing Methods 0.000 claims abstract description 52
- 239000007789 gas Substances 0.000 claims description 51
- WTEOIRVLGSZEPR-UHFFFAOYSA-N boron trifluoride Chemical compound FB(F)F WTEOIRVLGSZEPR-UHFFFAOYSA-N 0.000 claims description 45
- 239000006096 absorbing agent Substances 0.000 claims description 41
- 230000001105 regulatory effect Effects 0.000 claims description 33
- 229910015900 BF3 Inorganic materials 0.000 claims description 24
- 238000003860 storage Methods 0.000 claims description 16
- 230000001276 controlling effect Effects 0.000 claims description 9
- 239000001307 helium Substances 0.000 claims description 8
- 229910052734 helium Inorganic materials 0.000 claims description 8
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- 238000005452 bending Methods 0.000 claims description 6
- 238000000746 purification Methods 0.000 claims description 6
- 238000005507 spraying Methods 0.000 claims description 6
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 238000009826 distribution Methods 0.000 description 8
- 238000010030 laminating Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 6
- 238000013461 design Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 230000009257 reactivity Effects 0.000 description 3
- 230000004308 accommodation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000009194 climbing Effects 0.000 description 2
- 230000008094 contradictory effect Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000012552 review Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C7/00—Control of nuclear reaction
- G21C7/06—Control of nuclear reaction by application of neutron-absorbing material, i.e. material with absorption cross-section very much in excess of reflection cross-section
- G21C7/24—Selection of substances for use as neutron-absorbing material
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C7/00—Control of nuclear reaction
- G21C7/06—Control of nuclear reaction by application of neutron-absorbing material, i.e. material with absorption cross-section very much in excess of reflection cross-section
- G21C7/22—Control of nuclear reaction by application of neutron-absorbing material, i.e. material with absorption cross-section very much in excess of reflection cross-section by displacement of a fluid or fluent neutron-absorbing material, e.g. by adding neutron-absorbing material to the coolant
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Plasma & Fusion (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Monitoring And Testing Of Nuclear Reactors (AREA)
Abstract
The invention relates to the technical field of gas cooled shutdown, in particular to a flow dividing device and a high-temperature gas cooled shutdown system, comprising a containing mechanism, a flow dividing device and a flow dividing device, wherein the containing mechanism comprises a containing body and a feeding pipe fixedly arranged at the top end of the containing body; the flow guiding mechanism comprises a straight part and a bent pipe which are fixedly arranged at the bottom end of the accommodating body, a first threaded connecting part fixedly arranged at the bottom end of the straight part, and a second threaded connecting part fixedly arranged at the end part of the bent pipe; the size specification of the first threaded connecting piece is the same as that of the second threaded connecting piece, the accommodating body comprises an accommodating barrel and an accommodating groove arranged in the accommodating barrel, after the threaded end and the first threaded connecting piece are in threaded connection through the replacement of the jacking mechanisms with different specification lengths, the distance of the jacking mechanisms for pushing up the sealing piece is changed, the sliding height of the sliding piece is changed, the sliding of the plunger is controlled through controlling the sliding height of the sliding piece, and the number of gas channels is changed.
Description
Technical Field
The invention relates to the technical field of gas cooled shutdown, in particular to a flow dividing device and a high-temperature gas cooled shutdown system.
Background
The fuel elements of the pebble-bed high-temperature gas cooled reactor are randomly piled up in the reactor core, a regular channel cannot be formed, and the inserted control rod structure can cause faults such as bridging, broken balls and the like. The reactivity control apparatus of the pebble-bed type high temperature gas cooled reactor is thus disposed at the side reflection layer. However, the residual reactivity of the reactor is not excessive due to the low value of the absorber of the side reflecting layer, so that the reactor core structural design and the reactor power are limited, and a plurality of limiting conditions, such as the lifting speed of the control rod and the circulating speed of the fuel ball, are added for the operation of the reactor, so that a high-temperature gas cooled reactor shutdown system is provided.
In addition, a flow distribution device is needed to guide gas in the working process of the high-temperature gas cooled reactor shutdown system, a plurality of control valves are generally adopted by the conventional flow distribution device to control the quantity of gas flow distribution channels, when the flow distribution device is applied to the pebble-bed high-temperature gas cooled reactor, the valve structure is exposed and easy to damage, the quantity of the flow distribution pipes is more, more control valves are needed to be arranged, and the use cost is high.
Disclosure of Invention
The present invention has been made in view of the above or the problems in the prior art that the cost is high and the valve is vulnerable when the number of gas diversion passages is controlled by using a valve structure.
It is therefore an object of the present invention to provide a shunt device.
In order to solve the technical problems, the invention provides the following technical scheme: the shunt device comprises a containing mechanism, a shunt device and a shunt device, wherein the containing mechanism comprises a containing body and a feeding pipe fixedly arranged at the top end of the containing body; the flow guiding mechanism comprises a straight part and a bent pipe which are fixedly arranged at the bottom end of the accommodating body, a first threaded connecting part fixedly arranged at the bottom end of the straight part, and a second threaded connecting part fixedly arranged at the end part of the bent pipe; the size specification of the first threaded connecting piece is the same as the size specification of the second threaded connecting piece; the accommodating body comprises an accommodating barrel, an accommodating groove arranged in the accommodating barrel, a transverse channel, a longitudinal channel and a diversion trench arranged in the accommodating barrel; the transverse channels and the longitudinal channels are vertically distributed and are mutually communicated, and the diversion trenches, the transverse channels and the accommodating trenches are in a communicated state; the plugging mechanism comprises a spring fixedly arranged at the bottom end of the accommodating barrel, a sealing piece fixedly arranged at the end part of the spring, and a sliding piece fixedly arranged at the top end of the sealing piece, wherein the surface of the sliding piece is provided with a guide groove; the pushing mechanism comprises a ring body rotationally arranged in the accommodating groove, a guide block fixedly arranged on the inner wall of the ring body, and a chute arranged on the surface of the ring body; the shutoff mechanism comprises a plunger slidingly arranged in the transverse channel and a pull rod fixedly arranged on the plunger; the conveying mechanism comprises a threaded end head which is in threaded connection with the first threaded connecting piece and a conveying pipe which is fixedly arranged on the threaded end head, and the surface of the conveying pipe is provided with an injection hole; and the jacking mechanism is slidably arranged in the conveying pipe and is used for pushing the sealing element to move when the conveying mechanism is connected with the flow guiding mechanism.
As a preferred embodiment of the shunt device according to the invention, wherein: the accommodating body further comprises a ring groove arranged on the inner wall of the accommodating groove; the pushing mechanism further comprises a limiting ring fixedly arranged on the outer wall of the ring body; the outer wall of the limiting ring is rotationally connected with the inner wall of the annular groove; the guide groove comprises a lower straight groove, a curved groove and an upper straight groove which are arranged on the surface of the sliding piece, and the lower straight groove, the curved groove and the upper straight groove are sequentially connected and mutually communicated.
As a preferred embodiment of the shunt device according to the invention, wherein: the accommodating mechanism further comprises a sealing ring table fixedly arranged on the accommodating barrel; the plugging mechanism further comprises a frustum fixedly arranged at the top end of the sliding piece.
As a preferred embodiment of the shunt device according to the invention, wherein: the through piece comprises a communicating pipe fixedly arranged at the bottom end of the accommodating barrel and an accommodating cavity arranged in the communicating pipe; the sealing piece comprises a sealing table fixedly arranged at the bottom end of the sliding piece and a conical head fixedly arranged at the bottom end of the sealing table; the first threaded connecting piece comprises a threaded sleeve fixedly arranged at the bottom end of the communicating pipe and a conical hole arranged at the top end of the threaded sleeve.
As a preferred embodiment of the shunt device according to the invention, wherein: the sliding piece comprises a sliding rod fixedly arranged at the top end of the sealing table, a sealing ring piece fixedly arranged on the outer wall of the sliding rod and a limiting groove arranged on the surface of the sliding rod; the accommodating body further comprises a limiting block fixedly arranged on the inner wall of the accommodating groove; the outer wall of the limiting block is in sliding connection with the inner wall of the limiting groove.
As a preferred embodiment of the shunt device according to the invention, wherein: the jacking mechanism comprises an inserted bar which is slidably arranged in the conveying pipe, a collision post which is fixedly arranged at the end part of the inserted bar, and a jacking rod which is fixedly arranged at the end part of the collision post.
As a preferred embodiment of the shunt device according to the invention, wherein: the conveying mechanism further comprises a supporting block and a fitting block which are fixedly arranged on the inner wall of the threaded end head.
The flow dividing device has the beneficial effects that: according to the invention, by replacing the jacking mechanisms with different specification lengths, after the threaded end head is in threaded connection with the first threaded connecting piece, the distance of the jacking mechanism for pushing the sealing piece upwards is changed, so that the sliding height of the sliding piece is changed, the sliding of the plunger is controlled by controlling the sliding height of the sliding piece, the number of gas channels is changed, a user can conveniently adjust according to the power of the reactor, and by adopting the structure, the structure has the advantages of stronger stability, longer service life, difficulty in damage and effective reduction of the use cost.
In view of the fact that in the practical use process, the absorber value of the side reflecting layer of the pebble-bed high-temperature gas cooled reactor is low, the residual reactivity of the reactor is not suitable to be too high, and the problems of reactor core structural design and reactor power are limited.
In order to solve the technical problems, the invention also provides the following technical scheme: the high-temperature gas cooled reactor shutdown system comprises two flow dividing devices, namely an upper partial flow device and a lower partial flow device, wherein the two flow dividing devices are used for spraying boron trifluoride neutron absorber, the lower part of the upper partial flow device is communicated with a reactor core, and the upper part of the lower partial flow device is communicated with the reactor core; and a helium purging system for displacing gas within the reactor; a flow meter for measuring the flow rate of boron trifluoride neutron absorber into the upper and lower partial flow devices; a first regulating valve for controlling the flow rate of boron trifluoride neutron absorber ejected from the upper stream device; a second regulating valve for controlling the flow rate of boron trifluoride neutron absorber ejected from the down-flow device; an absorber storage tank for storing boron trifluoride neutron absorber; a first shut-off valve for disconnecting the absorber tank; and a second shut-off valve for shutting off the connection with the first shut-off valve.
As a preferable scheme of the high-temperature gas cooled reactor shutdown system, the invention comprises the following steps: the absorber storage tank is a high-pressure storage tank, boron trifluoride is stored in the absorber storage tank, and the pressure is 8.0-10.0 MPa; the flowmeter is an electromagnetic flowmeter; the first regulating valve and the second regulating valve are electric regulating valves; the first stop valve and the second stop valve are electric stop valves.
As a preferable scheme of the high-temperature gas cooled reactor shutdown system, the invention comprises the following steps: the gas inlet and outlet of the absorber storage tank are connected with a first stop valve, the first stop valve is connected with a second stop valve through a pipeline, the second stop valve is respectively connected with two flow meters which are distributed up and down through T-shaped pipelines, the two flow meters are respectively connected with a first regulating valve and a second regulating valve through pipelines, the first regulating valve is connected with an upper part flow device through a pipeline, and the second regulating valve is connected with a lower part flow device through a pipeline.
The high-temperature gas cooled reactor shutdown system has the beneficial effects that: the shutdown system can be arranged at the top and the bottom of the reactor core, the holes of the side reflecting layer are reduced, the reactive value is higher and the reactor is shut down more reliably by directly spraying boron fluoride to the reactor core, and the absorber is filtered out of the reactor core through a helium purification system or atmosphere replacement when the reactor is started, so that the purpose of restarting is achieved, the diversity of the reactive control system is improved, the shutdown reliability of the pebble-bed high-temperature gas cooled reactor is improved, and the value of the reactive absorber is increased.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is an overall schematic view of a shunt device.
Fig. 2 is a schematic cross-sectional structure of the shunt device.
Fig. 3 is a schematic view of the internal structure of the shunt device.
Fig. 4 is a schematic view of the structure of the container of the shunt device.
Fig. 5 is a schematic diagram of a connection structure of a plugging mechanism and a diversion mechanism of the diversion device.
Fig. 6 is a schematic structural diagram of a plugging mechanism of the shunt device.
Fig. 7 is a schematic diagram of a connection structure of a pushing mechanism and a shutoff mechanism of the diverter.
Fig. 8 is a schematic structural view of a conveying mechanism of the shunt device.
Fig. 9 is a schematic diagram of a connection structure of a conveying mechanism and an overhead mechanism of the diverting device.
Fig. 10 is a schematic structural view of a top mechanism of a diverter with different specifications.
FIG. 11 is a schematic diagram of the overall structure of a high temperature gas cooled reactor shutdown system.
In the figure:
1. an absorber storage tank; 2. a first stop valve; 3. a second shut-off valve; 4. a first regulating valve; 5. a second regulating valve; 6. a flow meter; 7. an upper partial flow means; 8. a lower partial flow means; 9. a helium purification system;
100. a housing mechanism; 101. a housing body; 102. a feed pipe; 103. a seal ring table; 101a, a containing barrel; 101b, a receiving groove; 101c, transverse channels; 101d, longitudinal channels; 101e, diversion trenches; 101f, ring grooves; 101g, limiting blocks; 200. a diversion mechanism; 201. a straight-through member; 202. a first threaded connection; 203. bending the tube; 204. a second threaded connection; 201a, communicating tube; 201b, a receiving cavity; 202a, a threaded sleeve; 202b, a tapered hole; 300. a plugging mechanism; 301. a spring; 302. a seal; 303. a slider; 304. a guide groove; 305. a frustum; 302a, a sealing table; 302b, a conical head; 303a, a slide bar; 303b, a limit groove; 303c, sealing ring piece; 304a, a lower straight groove; 304b, curved slots; 304c, upper straight groove; 400. a pushing mechanism; 401. a ring body; 402. a guide block; 403. a chute; 404. a limiting ring; 500. a shutoff mechanism; 501. a plunger; 502. a pull rod; 600. a conveying mechanism; 601. a threaded end; 602. a delivery tube; 603. an injection hole; 604. a support block; 605. a bonding block; 700. a jacking mechanism; 701. a rod; 702. a contact column; 703. and (5) a push rod.
Detailed Description
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present invention is not limited to the specific embodiments disclosed below.
Further, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic can be included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
Embodiment 1, referring to fig. 1 to 10, a first embodiment of the present invention provides a flow dividing device, which includes a receiving mechanism 100 including a receiving body 101 and a feeding tube 102 fixedly disposed at a top end of the receiving body 101; in this embodiment, boron trifluoride neutron absorber can enter the interior of the containment body 101 through the feed tube 102.
The diversion mechanism 200 comprises a straight-through piece 201 and a bending tube 203 which are fixedly arranged at the bottom end of the accommodating body 101, a first threaded connecting piece 202 fixedly arranged at the bottom end of the straight-through piece 201, and a second threaded connecting piece 204 fixedly arranged at the end part of the bending tube 203; in this embodiment, the bottom of the accommodating mechanism 100 is uniformly provided with a plurality of diversion mechanisms 200, the diversion mechanisms 200 are used for being inserted into the reactor core and communicated with the core, boron trifluoride neutron absorber is conveyed into the core, and each diversion mechanism 200 is composed of a straight-through member 201 and four curved tubes 203 which are distributed at equal intervals circumferentially outside the straight-through member 201.
Preferably, the first threaded connection 202 is the same size as the second threaded connection 204.
Further, the accommodating body 101 includes an accommodating barrel 101a, an accommodating groove 101b arranged in the accommodating barrel 101a, a transverse channel 101c, a longitudinal channel 101d and a diversion trench 101e arranged in the accommodating barrel 101 a; in this embodiment, the accommodating barrel 101a is in a barrel structure, the bottom of the accommodating barrel 101a is provided with an accommodating groove 101b in a penetrating manner, the diameter of the upper end of the accommodating groove 101b is larger than that of the lower end, four equally-spaced circumferential transverse channels 101c and longitudinal channels 101d are arranged on the periphery of each accommodating groove 101b, and a diversion trench 101e is arranged at the connecting part of each transverse channel 101c and each accommodating groove 101 b.
Preferably, the transverse channel 101c and the longitudinal channel 101d are vertically distributed and are mutually communicated, and the diversion trench 101e, the transverse channel 101c and the accommodation trench 101b are in a communicated state.
The plugging mechanism 300 comprises a spring 301 fixedly arranged at the bottom end of the accommodating barrel 101a, a sealing piece 302 fixedly arranged at the end part of the spring 301, and a sliding piece 303 fixedly arranged at the top end of the sealing piece 302, wherein a guide groove 304 is formed in the surface of the sliding piece 303; in this embodiment, the seal member 302 can have a pushing-down trend by the elastic force of the spring 301, so that the sliding member 303 has a sliding-down trend, and two guide grooves 304 arranged in an array are formed on the outer wall of the sliding member 303.
The pushing mechanism 400 comprises a ring body 401 rotatably arranged in the accommodating groove 101b, a guide block 402 fixedly arranged on the inner wall of the ring body 401, and a chute 403 arranged on the surface of the ring body 401; in this embodiment, the ring body 401 can rotate inside the accommodating groove 101b, two symmetrically arranged guiding blocks 402 are fixedly mounted on the inner wall of the ring body 401, the outer wall of the guiding blocks 402 is slidably connected with the inner wall of the guiding groove 304, and four inclined grooves 403 in an equidistant circumferential array are formed in the surface of the ring body 401.
A shutoff mechanism 500 including a plunger 501 slidably disposed in the lateral passage 101c, and a tie rod 502 fixedly disposed on the plunger 501; in the present embodiment, the plunger 501 is capable of sliding in the lateral passage 101c, and the communication between the lateral passage 101c, the longitudinal passage 101d, and the receiving groove 101b can be controlled by controlling the sliding of the plunger 501, and the outer wall of the tie rod 502 and the inner wall of the chute 403 are slidably connected.
The conveying mechanism 600 comprises a threaded end 601 which is in threaded connection with the first threaded connector 202, and a conveying pipe 602 which is fixedly arranged on the threaded end 601, wherein the surface of the conveying pipe 602 is provided with a spray hole 603; in this embodiment, the screw head 601 can be fitted to the delivery pipe 602 by engaging the first screw coupling 202 and the second screw coupling 204, and the injection hole 603 on the delivery pipe 602 can inject the gas.
The jacking mechanism 700 is slidably arranged in the conveying pipe 602 and is used for pushing the sealing element 302 to move when the conveying mechanism 600 is connected with the flow guiding mechanism 200, in this embodiment, the jacking mechanism 700 is arranged in the conveying pipe 602, after the threaded end 601 and the first threaded connecting piece 202 are in threaded connection through changing the jacking mechanism 700 with different specification lengths, the distance that the jacking mechanism 700 pushes up the sealing element 302 is changed, the sliding height of the sliding element 303 is changed, and the sliding of the plunger 501 is controlled by controlling the sliding height of the sliding element 303, so that the number of gas channels is changed.
Preferably, the accommodating body 101 further includes a ring groove 101f provided on an inner wall of the accommodating groove 101 b; the pushing mechanism 400 further comprises a limiting ring 404 fixedly arranged on the outer wall of the ring body 401; in the present embodiment, the outer wall of the retainer ring 404 and the inner wall of the ring groove 101f are rotatably connected; the limiting ring 404 cooperates with the ring groove 101f to limit the ring 401.
The guide groove 304 includes a lower straight groove 304a, a curved groove 304b, and an upper straight groove 304c provided on the surface of the slider 303, the lower straight groove 304a, the curved groove 304b, and the upper straight groove 304c are sequentially connected and communicate with each other, and in this embodiment, the curved groove 304b is in an inclined state, when the guide block 402 slides inside the lower straight groove 304a and the upper straight groove 304c, the ring 401 does not rotate, and when the guide block 402 slides inside the curved groove 304b, the ring 401 rotates.
Specifically, the jack mechanism 700 includes a plunger 701 that slides and locates in the conveyer pipe 602, and the conflict post 702 of locating the plunger 701 tip is fixed, still including the ejector pin 703 of locating the conflict post 702 tip fixedly, in this embodiment, after the plunger 701 inserts conveyer pipe 602 inside, can effectively reduce the inside gas passage's of conveyer pipe 602 area, increase the pressure of air current, ejector pin 703 is used for contradicting sealing member 302, the ejector pin 703 of different length specifications can push up the sealing member 302 different distances after screw thread end 601 and first screw thread connection 202 threaded connection.
In the initial state, the first threaded connector 202 is not in threaded connection with the threaded end 601, at this time, under the action of the elastic force of the spring 301, the sealing member 302 slides down to the maximum stroke, the guide block 402 is located at the position of the upper straight groove 304c away from the curved groove 304b, the pull rod 502 is located at the position of the chute 403 away from the axis of the ring body 401, the plunger 501 is inserted into the transverse channel 101c to the maximum depth, and the longitudinal channel 101d and the channel inside the accommodating barrel 101a are cut off.
When a small amount of gas channels are needed, as shown in fig. 10, the ejector rod 703 is adopted, the ejector rod 700 with a shorter length is inserted into the conveying pipe 602, the threaded end 601 and the first threaded connector 202 are in threaded connection, in the threaded connection process, the ejector rod 703 pushes up the sealing member 302, so that the sliding member 303 slides up, when the sliding member 303 slides up, due to the shorter length of the ejector rod 703, the sliding member 303 slides up, the guide block 402 slides on the inner wall of the upper straight groove 304c, the ring body 401 does not rotate, and therefore the plunger 501 is in a state of blocking the transverse channel 101c, and only the straight member 201 is communicated with the interior of the accommodating barrel 101a, and the gas channels are one.
When more gas channels are needed, the ejector rod 703 is adopted, the ejector rod 700 is longer in length, the ejector rod 700 is inserted into the conveying pipe 602, the threaded end 601 and the first threaded connector 202 are in threaded connection, in the threaded connection process, the ejector rod 703 pushes up the sealing member 302, the sliding member 303 slides upwards, when the sliding member 303 slides upwards, due to the longer length of the ejector rod 703, the sliding member 303 slides upwards for a longer distance, the guide block 402 slides into the curved groove 304b from the inner wall of the upper straight groove 304c, and slides into the lower straight groove 304a from the curved groove 304b, the guide block 402 is pushed due to the guide of the curved groove 304b, the ring 401 rotates, the pull rod 502 is guided by the chute 403 to pull the plunger 501 out of the transverse channel 101c, and after the plunger 501 is pulled out for a certain distance, the containing groove 101b and the longitudinal channel 101d are communicated through the guide groove 101e, and the containing member 201 and the curved pipe 203 are communicated with the containing barrel 101 a.
In the actual use process, the conveying mechanism 600 at the corresponding position can be installed according to the requirement, gas channels with different distribution states can be formed, boron trifluoride neutron absorber enters the inside of the accommodating barrel 101a through the feeding pipe 102 and enters the through piece 201 through the accommodating groove 101b to convey gas, the conveying mechanism 600 is inserted into the reactor core to perform cooling and shutdown operation through spraying gas, and when the plunger 501 does not block the longitudinal channel 101d, the gas can also enter the bending pipe 203 through the accommodating groove 101b, the guide groove 101e, the transverse channel 101c and the longitudinal channel 101d to spray.
Embodiment 2 referring to fig. 1 to 10, which are a second embodiment of the present invention, unlike the previous embodiment, the accommodating mechanism 100 further includes a seal ring stage 103 fixedly provided on the accommodating tub 101 a; in the present embodiment, the seal ring stage 103 and the accommodation groove 101b are provided in one-to-one correspondence.
Preferably, the plugging mechanism 300 further includes a frustum 305 fixedly disposed at the top end of the sliding member 303, in this embodiment, the sealing member 302 is pushed down by the elastic force of the spring 301, when the first threaded connector 202 is not provided with the conveying mechanism 600, the frustum 305 can abut against the surface of the sealing ring 103 to form a sealing state, and when the sealing mechanism is matched with the sealing state, the pressure of the gas acts on the surface of the frustum 305, so that the gas of the unused guiding mechanism 200 can be prevented from overflowing.
Further, the through-hole 201 includes a communicating pipe 201a fixedly provided at the bottom end of the accommodating tub 101a, and an accommodating chamber 201b provided inside the communicating pipe 201 a; in this embodiment, the lower end surfaces of the accommodating chambers 201b are gradually reduced, when the conveying mechanism 600 is not mounted on the first threaded connection member 202, the elastic force of the springs 301 pushes down the sealing member 302, so that the outer surface of the sealing member 302 and the edge portion of the accommodating chambers 201b form interference, the bottom end of the communicating pipe 201a is sealed, and when the sealing member 302 is matched with the pressure of the gas during working, the gas of the unused flow guiding mechanism 200 can be prevented from overflowing.
Preferably, the sealing member 302 includes a sealing platform 302a fixedly disposed at the bottom end of the sliding member 303, and a conical head 302b fixedly disposed at the bottom end of the sealing platform 302 a; in this embodiment, the diameter of the outer surface of the sealing platform 302a gradually decreases from top to bottom, so that the sealing performance of the sealing platform 302a when attached to the accommodating cavity 201b can be further improved, and the conical head 302b is disposed at the bottom center of the sealing platform 302 a.
Further, the first threaded connection 202 includes a threaded sleeve 202a fixedly disposed at the bottom end of the communicating pipe 201a, and a tapered hole 202b disposed at the top end of the threaded sleeve 202a, in this embodiment, the inner wall size of the tapered hole 202b and the outer wall size of the tapered head 302b are matched with each other, when the sealing platform 302a is attached to the bottom edge of the accommodating cavity 201b, the tapered head 302b is just inserted into and attached to the inner wall of the tapered hole 202b, and by attaching the tapered head 302b to the tapered hole 202b, gas overflow of the unused flow guiding mechanism 200 can be avoided.
Preferably, the sliding member 303 includes a sliding rod 303a fixedly arranged at the top end of the sealing platform 302a, a sealing ring piece 303c fixedly arranged on the outer wall of the sliding rod 303a, and a limiting groove 303b arranged on the surface of the sliding rod 303 a; in this embodiment, when the conical head 302b and the conical hole 202b are in the bonding state, the bottom surface of the sealing ring piece 303c at this time will be in the bonding and abutting state with the inner wall of the accommodating groove 101b, and by bonding the sealing ring piece 303c and the inner wall of the accommodating groove 101b, the gas in the unused diversion mechanism 200 can be prevented from overflowing.
Preferably, the accommodating body 101 further comprises a limiting block 101g fixedly arranged on the inner wall of the accommodating groove 101 b; in this embodiment, the outer wall of the stopper 101g is slidably connected to the inner wall of the stopper groove 303 b.
It should be noted that, conveying mechanism 600 still includes fixed supporting shoe 604 and the laminating piece 605 of locating the inner wall of screw thread end 601, in this embodiment, the top setting of screw thread end 601 is kept away from to supporting shoe 604, laminating piece 605 is close to the top setting of screw thread end 601, laminating piece 605 and supporting shoe 604 are equipped with a plurality ofly, and be equidistant circumference distribution and locate the inner wall of screw thread end 601, can assist spacing to climbing mechanism 700 through supporting shoe 604 and laminating piece 605, and, the thickness of supporting shoe 604 is greater than the thickness of laminating piece 605, after the inside of contradicting post 702 inserts screw thread end 601, can form the conflict spacing to the abutment post 702 through supporting shoe 604, laminating piece 605 laminating is supported the surface of touching post 702, increase the stability of touching post 702, because equidistant circumference distribution's laminating piece 605 and supporting shoe 604 have the clearance each other, consequently, can supply gas to circulate, because climbing mechanism 700 inserts after the conveyer pipe 602 inside space reduces, can increase gas pressure, promote gas blowout's effect.
The rest of the structure is the same as in embodiment 1.
In summary, the diversion mechanism 200 without the conveyance mechanism 600 can maintain good sealing performance during operation.
Embodiment 3, referring to FIG. 11, is a third embodiment of the present invention, which is different from the previous embodiment in that the embodiment provides a high temperature gas cooled reactor shutdown system, and the high temperature gas cooled reactor shutdown system comprises a split device, wherein two split devices are provided, namely an upper part flow device 7 and a lower part flow device 8, which are respectively used for spraying boron trifluoride neutron absorber, the lower part of the upper part flow device 7 is communicated with a reactor core, and the upper part of the lower part flow device 8 is communicated with the reactor core; and a helium purification system 9 for displacing the gas within the reactor; a flow meter 6 for measuring the flow rate of boron trifluoride neutron absorber into the upper partial flow device 7 and the lower partial flow device 8; a first regulating valve 4 for controlling the flow rate of boron trifluoride neutron absorber discharged from the upper flow divider 7; a second regulating valve 5 for controlling the flow rate of boron trifluoride neutron absorber discharged from the down-flow device 8; an absorber storage tank 1 for storing boron trifluoride neutron absorber; a first shut-off valve 2 for disconnecting the absorber tank 1; a second shut-off valve 3 for shutting off the connection with the first shut-off valve 2.
Specifically, the absorber storage tank 1 is a high-pressure storage tank, boron trifluoride is stored in the absorber storage tank, and the pressure is 8.0-10.0 MPa; the flowmeter 6 is an electromagnetic flowmeter; the first regulating valve 4 and the second regulating valve 5 are electric regulating valves; the first stop valve 2 and the second stop valve 3 are electric stop valves.
Further, the inlet and outlet of the gas of the absorber storage tank 1 are connected with the first stop valve 2, the first stop valve 2 is connected with the second stop valve 3 through a pipeline, the second stop valve 3 is respectively connected with two flow meters 6 which are distributed up and down through a T-shaped pipeline, the two flow meters 6 are respectively connected with the first regulating valve 4 and the second regulating valve 5 through pipelines, the first regulating valve 4 is connected with the upper part flow device 7 through a pipeline, and the second regulating valve 5 is connected with the lower part flow device 8 through a pipeline.
The rest of the structure is the same as in embodiment 2.
When the reactor needs to be shut down, the first stop valve 2 is opened, the second stop valve 3 is opened, the first regulating valve 4 is regulated to enable the indication number of the flowmeter 6 to be 1-2 kg/s, and the second regulating valve 5 is regulated to enable the indication number of the flowmeter 6 to be 1-2 kg/s; the first control valve 4 and the second control valve 5 are closed when the absorber tank 1 pressure is < 7.2 MPa.
When the reactor is started, the boron fluoride obtained in the reactor core can be filtered by starting the helium purification system 9; or the inside atmosphere of the reactor is replaced with air, and then the pure helium gas is refilled.
In conclusion, the shutdown system provided by the invention can be arranged at the top and the bottom of the reactor core, the holes of the side reflection layer are reduced, the reactive value is higher and the reactor is shutdown more reliably by directly spraying boron fluoride to the reactor core, and the absorber is filtered out of the reactor core through the helium purification system 9 or atmosphere replacement during the starting of the reactor core, so that the restarting purpose is achieved, the diversity of the reactive control system is increased, the shutdown reliability of the pebble-bed high-temperature gas cooled reactor is improved, and the value of the reactive absorber is increased.
It is important to note that the construction and arrangement of the present application as shown in a variety of different exemplary embodiments is illustrative only. Although only a few embodiments have been described in detail in this disclosure, those skilled in the art who review this disclosure will readily appreciate that many modifications are possible (e.g., variations in sizes, dimensions, structures, shapes and proportions of the various elements, values of parameters (e.g., temperature, pressure, etc.), mounting arrangements, use of materials, colors, orientations, etc.) without materially departing from the novel teachings and advantages of the subject matter described in this application. For example, elements shown as integrally formed may be constructed of multiple parts or elements, the position of elements may be reversed or otherwise varied, and the nature or number of discrete elements or positions may be altered or varied. Accordingly, all such modifications are intended to be included within the scope of present invention. The order or sequence of any process or method steps may be varied or re-sequenced according to alternative embodiments. In the claims, any means-plus-function clause is intended to cover the structures described herein as performing the recited function and not only structural equivalents but also equivalent structures. Other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments without departing from the scope of the present inventions. Therefore, the invention is not limited to the specific embodiments, but extends to various modifications that nevertheless fall within the scope of the appended claims.
Furthermore, in order to provide a concise description of the exemplary embodiments, all features of an actual implementation may not be described (i.e., those not associated with the best mode presently contemplated for carrying out the invention, or those not associated with practicing the invention).
It should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort might be complex and time consuming, but would nevertheless be a routine undertaking of design, fabrication, and manufacture for those of ordinary skill having the benefit of this disclosure.
It should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention may be modified or substituted without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered in the scope of the claims of the present invention.
Claims (10)
1. A shunt device, characterized by: comprising the steps of (a) a step of,
the accommodating mechanism (100) comprises an accommodating body (101) and a feeding pipe (102) fixedly arranged at the top end of the accommodating body (101);
the flow guiding mechanism (200) comprises a straight-through part (201) and a bending tube (203) which are fixedly arranged at the bottom end of the accommodating body (101), a first threaded connecting part (202) which is fixedly arranged at the bottom end of the straight-through part (201), and a second threaded connecting part (204) which is fixedly arranged at the end part of the bending tube (203);
the first threaded connection (202) has the same dimensional specification as the second threaded connection (204);
the accommodating body (101) comprises an accommodating barrel (101 a), an accommodating groove (101 b) arranged in the accommodating barrel (101 a), a transverse channel (101 c), a longitudinal channel (101 d) and a diversion trench (101 e) arranged in the accommodating barrel (101 a);
the transverse channels (101 c) and the longitudinal channels (101 d) are vertically distributed and are communicated with each other, and the diversion trenches (101 e), the transverse channels (101 c) and the accommodating trenches (101 b) are in a communicated state;
the plugging mechanism (300) comprises a spring (301) fixedly arranged at the bottom end of the accommodating barrel (101 a), a sealing piece (302) fixedly arranged at the end part of the spring (301), and a sliding piece (303) fixedly arranged at the top end of the sealing piece (302), wherein a guide groove (304) is formed in the surface of the sliding piece (303);
the pushing mechanism (400) comprises a ring body (401) rotatably arranged in the accommodating groove (101 b), a guide block (402) fixedly arranged on the inner wall of the ring body (401), and a chute (403) arranged on the surface of the ring body (401);
a shutoff mechanism (500) including a plunger (501) slidably disposed in the lateral passage (101 c), and a tie rod (502) fixedly disposed on the plunger (501);
the conveying mechanism (600) comprises a threaded end head (601) which is in threaded connection with the first threaded connecting piece (202), and a conveying pipe (602) which is fixedly arranged on the threaded end head (601), wherein the surface of the conveying pipe (602) is provided with an injection hole (603);
and the jacking mechanism (700) is slidably arranged in the conveying pipe (602) and is used for pushing the sealing element (302) to move when the conveying mechanism (600) is connected with the flow guiding mechanism (200).
2. The shunt device of claim 1, wherein: the accommodating body (101) further comprises a ring groove (101 f) arranged on the inner wall of the accommodating groove (101 b);
the pushing mechanism (400) further comprises a limiting ring (404) fixedly arranged on the outer wall of the ring body (401);
the outer wall of the limiting ring (404) is rotationally connected with the inner wall of the annular groove (101 f);
the guide groove (304) comprises a lower straight groove (304 a), a curved groove (304 b) and an upper straight groove (304 c) which are arranged on the surface of the sliding piece (303), and the lower straight groove (304 a), the curved groove (304 b) and the upper straight groove (304 c) are sequentially connected and communicated with each other.
3. The shunt device of claim 2, wherein: the accommodating mechanism (100) further comprises a sealing ring table (103) fixedly arranged on the accommodating barrel (101 a);
the plugging mechanism (300) further comprises a frustum (305) fixedly arranged at the top end of the sliding piece (303).
4. A shunt device according to claim 3, wherein: the through part (201) comprises a communicating pipe (201 a) fixedly arranged at the bottom end of the accommodating barrel (101 a), and an accommodating cavity (201 b) arranged inside the communicating pipe (201 a);
the sealing piece (302) comprises a sealing table (302 a) fixedly arranged at the bottom end of the sliding piece (303), and a conical head (302 b) fixedly arranged at the bottom end of the sealing table (302 a);
the first threaded connecting piece (202) comprises a threaded sleeve (202 a) fixedly arranged at the bottom end of the communicating pipe (201 a), and a conical hole (202 b) arranged at the top end of the threaded sleeve (202 a).
5. The shunt device of claim 4, wherein: the sliding piece (303) comprises a sliding rod (303 a) fixedly arranged at the top end of the sealing table (302 a), a sealing ring piece (303 c) fixedly arranged on the outer wall of the sliding rod (303 a), and a limiting groove (303 b) formed in the surface of the sliding rod (303 a);
the accommodating body (101) further comprises a limiting block (101 g) fixedly arranged on the inner wall of the accommodating groove (101 b);
the outer wall of the limiting block (101 g) is connected with the inner wall of the limiting groove (303 b) in a sliding mode.
6. The shunt device of claim 5, wherein: the jacking mechanism (700) comprises an inserting rod (701) which is slidably arranged in the conveying pipe (602), an abutting column (702) which is fixedly arranged at the end part of the inserting rod (701), and a push rod (703) which is fixedly arranged at the end part of the abutting column (702).
7. The shunt device of claim 6, wherein: the conveying mechanism (600) further comprises a supporting block (604) and a fitting block (605) which are fixedly arranged on the inner wall of the threaded end head (601).
8. The utility model provides a high temperature gas cooled reactor shutdown system which characterized in that: the device comprises two diversion devices as claimed in any one of claims 1 to 7, namely an upper partial flow device (7) and a lower partial flow device (8), which are used for spraying boron trifluoride neutron absorber, wherein the lower part of the upper partial flow device (7) is communicated with a reactor core, and the upper part of the lower partial flow device (8) is communicated with the reactor core; the method comprises the steps of,
a helium purification system (9) for displacing gas within the reactor;
a flow meter (6) for measuring the flow rate of boron trifluoride neutron absorber into the upper partial flow device (7) and the lower partial flow device (8);
a first regulating valve (4) for controlling the flow rate of boron trifluoride neutron absorber ejected from the upper flow divider (7);
a second regulating valve (5) for controlling the flow rate of boron trifluoride neutron absorber ejected from the down-flow device (8);
an absorber storage tank (1) for storing boron trifluoride neutron absorber;
a first shut-off valve (2) for disconnecting the absorber tank (1);
and a second shut-off valve (3) for shutting off the connection with the first shut-off valve (2).
9. The high temperature gas cooled reactor shutdown system of claim 8, wherein: the absorber storage tank (1) is a high-pressure storage tank, boron trifluoride is stored in the absorber storage tank, and the pressure is 8.0-10.0 MPa;
the flowmeter (6) is an electromagnetic flowmeter;
the first regulating valve (4) and the second regulating valve (5) are electric regulating valves;
the first stop valve (2) and the second stop valve (3) are electric stop valves.
10. The high temperature gas cooled reactor shutdown system of claim 8 or 9, wherein: the gas inlet and outlet of the absorber storage tank (1) are connected with a first stop valve (2), the first stop valve (2) is connected with a second stop valve (3) through a pipeline, the second stop valve (3) is respectively connected with two flowmeters (6) which are distributed up and down through T-shaped pipelines, the two flowmeters (6) are respectively connected with a first regulating valve (4) and a second regulating valve (5) through pipelines, the first regulating valve (4) is connected with an upper part flow device (7) through a pipeline, and the second regulating valve (5) is connected with a lower part flow device (8) through a pipeline.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311194122.4A CN117497207B (en) | 2023-09-15 | 2023-09-15 | Flow dividing device and high-temperature gas cooled reactor shutdown system |
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| CN202311194122.4A CN117497207B (en) | 2023-09-15 | 2023-09-15 | Flow dividing device and high-temperature gas cooled reactor shutdown system |
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| CN117497207B CN117497207B (en) | 2024-06-04 |
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| CN117497207B (en) | 2024-06-04 |
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