阅读说明：本技术 乏燃料筛分装置 (Spent fuel screening device ) 是由 陈伦树 于 2019-11-26 设计创作，主要内容包括：本发明乏燃料筛分装置,属于乏燃料后处理领域,目的是把剪切后乏燃料的外套管与包壳管和芯块进行筛选分离。包括底座、用于筛分外套管和芯块的乏燃料筛子以及用于导排芯块的下溜槽；所述下溜槽倾斜设置,其底端与芯块收集结构相连通；所述乏燃料筛子倾斜设置,其顶端与乏燃料导入装置相连通,底端与外套管导排结构相连通；乏燃料筛子安装于底座,经底座支撑于下溜槽上方,并与下溜槽的槽口相对应。本发明,经乏燃料剪机剪切的乏燃料棒通过乏燃料筛子,将外套管被隔离在乏燃料筛子内,芯块则被乏燃料筛子筛分经下溜槽的槽口掉落到下溜槽内实现外套管和芯块的筛分。(The invention discloses a spent fuel screening device, belongs to the field of spent fuel post-treatment, and aims to screen and separate an outer sleeve of sheared spent fuel, a cladding tube and pellets. The device comprises a base, a spent fuel sieve for sieving an outer sleeve and pellets and a lower chute for guiding and discharging the pellets; the lower chute is obliquely arranged, and the bottom end of the lower chute is communicated with the pellet collecting structure; the spent fuel sieve is obliquely arranged, the top end of the spent fuel sieve is communicated with the spent fuel guiding device, and the bottom end of the spent fuel sieve is communicated with the outer sleeve guide-discharge structure; the spent fuel sieve is arranged on the base, supported above the lower chute through the base and corresponds to the notch of the lower chute. According to the invention, the spent fuel rods sheared by the spent fuel shearing machine pass through the spent fuel sieve, the outer sleeve is isolated in the spent fuel sieve, and the pellets are sieved by the spent fuel sieve, fall into the lower chute through the notch of the lower chute and are sieved by the outer sleeve and the pellets.)

1. Spent fuel screening plant, its characterized in that: comprises a base (10), a spent fuel sieve used for sieving an outer sleeve and pellets and a lower chute (7) used for guiding and discharging the pellets; the lower chute (7) is obliquely arranged, and the bottom end of the lower chute is communicated with the pellet collecting structure; the spent fuel sieve is obliquely arranged, the top end of the spent fuel sieve is communicated with the spent fuel guiding device, and the bottom end of the spent fuel sieve is communicated with the outer sleeve guide-discharge structure; the spent fuel sieve is arranged on the base (10), is supported above the lower chute (7) through the base (10), and corresponds to the notch of the lower chute (7).

2. The spent fuel screening apparatus according to claim 1, wherein: the spent fuel sieve comprises a guide sieve (5), a fixed sieve (6) and a tipping sieve (9) which are sequentially arranged from top to bottom along the inclined direction of the spent fuel sieve; one end of the fixed sieve (6) is freely jointed with the end part of the guide sieve (5), and the other end is freely jointed with the end part of the tipping sieve (9); the guide sieve (5), the fixed sieve (6) and the tipping sieve (9) are detachably arranged on the base (10).

3. The spent fuel screening apparatus according to claim 2, wherein: and bounce steps (21) are arranged at the middle positions of the guide sieve (5), the fixed sieve (6) and the tipping sieve (9).

4. The spent fuel screening apparatus according to claim 2 or 3, wherein: the outer sleeve guide and discharge structure comprises a tipping bucket (22) arranged at the tail end of the tipping sieve (9), the tipping bucket (22) comprises a front side wall, a rear side wall and a bottom wall, the front side wall, the rear side wall and the bottom wall surround to form a U-shaped structure with two through ends, and the front side wall of the tipping bucket (22) is connected with the tail end of the tipping sieve (9).

5. The spent fuel screening device according to claim 4, wherein: the outer sleeve guide row structure also comprises a pushing hydraulic cylinder (18), a push rod (17), a pushing trolley (15) and a side chute (14); the side chute (14) and the pushing trolley (15) are respectively arranged on the opposite sides of the tipping bucket (22), the side chute (14) is communicated with the tipping bucket (22), one end of the push rod (17) is connected with the pushing hydraulic cylinder (18), the other end of the push rod is connected with the pushing trolley (15), and the pushing trolley (15) is driven by the pushing hydraulic cylinder (18) to axially reciprocate in the tipping bucket (22) along the tipping bucket (22).

6. The spent fuel screening device according to claim 5, wherein: a connecting hook (16) is arranged between the pushing trolley (15) and the push rod (17), one end of the connecting hook (16) is hinged to the pushing trolley (15), and the other end is hung to the push rod (17).

7. The spent fuel screening apparatus according to any one of claims 2 to 6, wherein: the tipping sieve (9) is movably arranged on the base (10) through a first rotating shaft, and the first rotating shaft is arranged in the middle of the tipping sieve (9); the guide sieve (5) is movably mounted on the base (10) through a second rotating shaft, the second rotating shaft is arranged at the top end of the guide sieve (5), rocking rods (12) are connected to the first rotating shaft and the second rotating shaft, a connecting rod (11) is arranged between the two rocking rods (12), and two ends of the connecting rod (11) are hinged to the corresponding rocking rods (12); a tipping driving device for driving the rocker (12) to swing is also arranged.

8. The spent fuel screening apparatus according to claim 7, wherein: the tipping driving device comprises a tipping hydraulic cylinder (20), a swinging rod (19) and a spline shaft (13), one end of the spline shaft (13) is connected with the swinging rod (19), the other end of the spline shaft is connected with the tipping sieve (9) in an inserting mode, and the other end, connected with the spline shaft (13), of the swinging rod (19) is hinged to the tipping hydraulic cylinder (20).

9. The spent fuel screening apparatus according to any one of claims 2 to 8, wherein: the device is characterized by further comprising a guide groove (3) and a slide carriage (4), wherein the guide groove (3) is obliquely arranged, the top end of the guide groove is a spent fuel inlet end, and the bottom end of the guide groove is a spent fuel outlet end; the slide carriage is positioned between the guide groove (3) and the guide sieve (5), one end of the slide carriage corresponds to the spent fuel outlet end of the guide groove (3), and the other end of the slide carriage extends downwards to the guide sieve (5) in an inclined mode.

10. The spent fuel screening apparatus according to claim 9, wherein: side guide plates (8) are arranged on two sides of the base (10), and the guide groove (3) and the slide carriage (4) are arranged on the side guide plates (8); the fixed sieve (6) is pressed on the base (10) through the side guide plate (8).

Technical Field

The invention belongs to the field of spent fuel post-treatment, and particularly relates to a spent fuel screening device.

Background

At present, nuclear fuel rods of nuclear power plants in China are taken out after reaching the combustion life and are stored in spent fuel pools of the nuclear power plants for cooling; after cooling, the spent fuel assembly is subjected to post-treatment such as disassembly, element cladding removal, fuel pellet dissolution and the like.

The spent fuel assembly is disassembled by conveying the cooled spent fuel to a shearing machine to be sheared into a plurality of small sections, and the sheared spent fuel sections fall into a hanging basket to enter subsequent treatment. The outer sleeve of the spent fuel section after shearing is easy to crack to form a barb; the barb is very easy to hang on the hanging basket, and when the outer sleeve is poured out from the hanging basket after the follow-up treatment is finished, part of the outer sleeve is hooked on the wall of the hanging basket, the outer sleeve cannot be completely poured out once, and the outer sleeve can be completely poured out for many times, so that the treatment efficiency is influenced.

Disclosure of Invention

The invention aims to screen and separate an outer sleeve of the sheared spent fuel from a cladding tube and a pellet. The separated outer sleeve is treated independently and does not fall into the hanging basket any more, but the cladding tube and the core block fall into the hanging basket for treatment, thereby solving the problem that part of the outer sleeve is easy to hang on the wall of the hanging basket and can not be poured out all at once.

The technical scheme adopted by the invention is as follows: the spent fuel screening device comprises a base, a spent fuel screen for screening the outer sleeve and the pellets and a lower chute for guiding and discharging the pellets; the lower chute is obliquely arranged, and the bottom end of the lower chute is communicated with the pellet collecting structure; the spent fuel sieve is obliquely arranged, the top end of the spent fuel sieve is communicated with the spent fuel guiding device, and the bottom end of the spent fuel sieve is communicated with the outer sleeve guide-discharge structure; the spent fuel sieve is arranged on the base, supported above the lower chute through the base and corresponds to the notch of the lower chute.

Further, the spent fuel sieve comprises a guide sieve, a fixed sieve and a tipping sieve which are sequentially arranged from top to bottom along the inclination direction of the spent fuel sieve; one end of the fixed sieve is freely jointed with the end part of the guide sieve, and the other end of the fixed sieve is freely jointed with the end part of the tipping sieve; the guide sieve, the fixed sieve and the tipping sieve are detachably arranged on the base.

Furthermore, the middle positions of the guide sieve, the fixed sieve and the tipping sieve are all provided with bouncing steps.

Furthermore, the outer sleeve guide and discharge structure comprises a tipping bucket arranged at the tail end of the tipping sieve, the tipping bucket comprises a front side wall, a rear side wall and a bottom wall, the front side wall, the rear side wall and the bottom wall surround to form a U-shaped structure with two through ends, and the front side wall of the tipping bucket is connected with the tail end of the tipping sieve.

Furthermore, the outer sleeve guide row structure also comprises a pushing hydraulic cylinder, a push rod, a pushing trolley and a side chute; the side chute and the pushing trolley are respectively arranged on the opposite sides of the tipping bucket, the side chute is communicated with the tipping bucket, one end of the push rod is connected to the pushing hydraulic cylinder, the other end of the push rod is connected to the pushing trolley, and the pushing hydraulic cylinder drives the pushing trolley to reciprocate in the tipping bucket along the axial direction of the tipping bucket.

Furthermore, a connecting hook is arranged between the pushing trolley and the push rod, one end of the connecting hook is hinged to the pushing trolley, and the other end of the connecting hook is hung to the push rod.

Further, the tipping sieve is movably arranged on the base through a first rotating shaft, and the first rotating shaft is arranged in the middle of the tipping sieve; the guide sieve is movably arranged on the base through a second rotating shaft, the second rotating shaft is arranged at the top end of the guide sieve, rocking rods are connected to the first rotating shaft and the second rotating shaft, a connecting rod is arranged between the two rocking rods, and two ends of the connecting rod are hinged to the corresponding rocking rods; and a tipping driving device for driving the rocker to swing is also arranged.

Furthermore, the tipping driving device comprises a tipping hydraulic cylinder, a swing rod and a spline shaft, one end of the spline shaft is connected with the swing rod, the other end of the spline shaft is connected with the tipping sieve in an inserting mode, and the other end, connected with the spline shaft, of the swing rod is hinged to the tipping hydraulic cylinder.

The device further comprises a guide groove and a slide carriage, wherein the guide groove is obliquely arranged, the top end of the guide groove is a spent fuel inlet end, and the bottom end of the guide groove is a spent fuel outlet end; the slide carriage is positioned between the guide groove and the guide sieve, one end of the slide carriage corresponds to the spent fuel outlet end of the guide groove, and the other end of the slide carriage extends to the guide sieve in an inclined and downward mode.

Furthermore, side guide plates are arranged on two sides of the base, and the guide groove and the slide carriage are arranged on the side guide plates; the fixed sieve is pressed on the base through the side guide plate.

The invention has the beneficial effects that: according to the invention, the spent fuel rods sheared by the spent fuel shearing machine pass through the spent fuel sieve, the outer sleeve is isolated in the spent fuel sieve, and the pellets are sieved by the spent fuel sieve, fall into the lower chute through the notch of the lower chute, so that the outer sleeve and the pellets are sieved. The screening reliability is ensured through one-time falling screening and three-time bouncing screening.

Drawings

FIG. 1 is a top view of the present invention;

FIG. 2 is a front view of the present invention;

FIG. 3 is a cross-sectional view A-A of FIG. 1;

FIG. 4 is a cross-sectional view E-E of FIG. 1;

FIG. 5 is a cross-sectional view F-F of FIG. 1;

fig. 6 is a sectional view taken along line J-J of fig. 1.

In the figure, a spent fuel shearing machine 1, a spent fuel rod 2, a guide groove 3, a slide carriage 4, a guide sieve 5, a fixed sieve 6, a lower slide carriage 7, a side guide plate 8, a tipping sieve 9, a base 10, a connecting rod 11, a rocker 12, a spline shaft 13, a side chute 14, a pushing trolley 15, a connecting hook 16, a push rod 17, a pushing hydraulic cylinder 18, a rocker 19, a tipping hydraulic cylinder 20, a bouncing step 21 and a tipping bucket 22.

Detailed Description

The invention is further described below with reference to the accompanying drawings:

the spent fuel screening device, as shown in fig. 1, 2 and 3, comprises a base 10, a spent fuel screen for screening the outer sleeve and the pellets, and a lower chute 7 for guiding and discharging the pellets; the lower chute 7 is obliquely arranged, and the bottom end of the lower chute is communicated with the pellet collecting structure; the base 10 is placed on the lower chute 7 through a pin shaft and can be replaced quickly; the spent fuel sieve is obliquely arranged, the top end of the spent fuel sieve is communicated with the spent fuel guiding device, and the bottom end of the spent fuel sieve is communicated with the outer sleeve guide-discharge structure; the spent fuel sieve is arranged on a base 10, is supported above the lower chute 7 through the base 10 and corresponds to the notch of the lower chute 7.

According to the invention, the spent fuel rods 2 sheared by the spent fuel shearing machine 1 enter the spent fuel sieve through the spent fuel guiding device, and the outer sleeve is isolated in the spent fuel sieve and slides to the outer sleeve guide-discharge structure along the inclined direction of the spent fuel sieve because the diameter of the outer sleeve is larger than that of the pellets; the pellet is then sieved by the spent fuel sieve and falls into the lower chute 7 through the notch of the lower chute 7, and slides into the pellet collecting structure, which is a hanging basket in the embodiment, under the action of gravity along the inclined direction of the lower chute 7. Because the spent fuel sieve sets up in the slope for spent fuel rod 2 relies on the gravity to move in the spent fuel sieve, realizes the screening of outer tube and pellet in the motion process, need not the purpose of spent fuel sieve motion in order to realize the screening, makes spent fuel screening plant more energy-conserving, overall structure is simpler. And the spent fuel rod 2 moves along the inclined direction of the spent fuel sieve under the action of gravity, so that the sieving path is prolonged, and the sieving is more thorough.

In order to sieve more thoroughly, it is preferable that the spent fuel screen includes a guide screen 5, a fixed screen 6 and a tilting screen 9, which are arranged in sequence, from top to bottom in the inclined direction of the spent fuel screen, as shown in fig. 2 or 3; one end of the fixed sieve 6 is freely jointed with the end part of the guide sieve 5, and the other end is freely jointed with the end part of the tipping sieve 9; the guide screen 5, the fixed screen 6 and the tilting screen 9 are detachably mounted on the base 10. The guide sieve 5, the fixed sieve 6 and the tipping sieve 9 are arranged, so that three-time sieving is realized, and the outer sleeve can be effectively sieved.

In order to achieve a further screening, it is preferred that a bouncing step 21 is provided in the middle position of each of the guide screen 5, the fixed screen 6 and the tilting screen 9, as shown in fig. 2 or 3. The bouncing step 21 is arranged, so that the spent fuel rod 2 can bounce when moving to the bouncing step 21, under the impact of bouncing, part of the core body which is not separated from the spent fuel rod 2 is separated from the outer sleeve, and the bouncing step 21 is arranged in the middle position, so that the core body which is separated by bouncing and the sieve part of the outer sleeve below the bouncing step 21 are continuously sieved, namely the spent fuel sieving device realizes three-time bouncing sieving.

The outer sleeve guide structure may be a channel-type structure, such as a guide groove, and preferably, the outer sleeve guide structure includes a dump bucket 22 disposed at the end of the tilting screen 9, the dump bucket 22 includes a front side wall, a rear side wall and a bottom wall, and is surrounded by the front side wall, the rear side wall and the bottom wall to form a U-shaped structure with two through ends, and the front side wall of the dump bucket 22 is connected with the end of the tilting screen 9. The tipping bucket 22 of this structure, when the outer tube dropped to tipping bucket 22 by tipping sieve 9, the back lateral wall played the effect of blockking to the outer tube, and the outer tube in the tipping bucket 22 can be discharged through the export at both ends to change the discharge direction of outer tube into the direction of motion of spent fuel rod 2 in the perpendicular to spent fuel sieve, be favorable to the reasonable distribution of each structure, practice thrift occupation space. Meanwhile, the outer sleeve can be discharged by means of hydraulic cylinders and the like, so that the labor input is reduced, and as shown in fig. 5, the outer sleeve guide and discharge structure further comprises a material pushing hydraulic cylinder 18, a push rod 17, a material pushing trolley 15 and a side chute 14; the side chute 14 and the pushing trolley 15 are respectively arranged on the opposite sides of the tipping bucket 22, the side chute 14 is communicated with the tipping bucket 22, one end of the push rod 17 is connected to the pushing hydraulic cylinder 18, the other end of the push rod is connected to the pushing trolley 15, and the pushing trolley 15 is driven by the pushing hydraulic cylinder 18 to reciprocate in the tipping bucket 22 along the axial direction of the tipping bucket 22.

The pushing trolley 15 is arranged beside the tipping bucket 22 and is arranged on the rail and movably matched with the rail, when the piston rod of the pushing hydraulic cylinder 18 extends out, the push rod 17 pushes the pushing trolley 15 to move into the tipping bucket 22 along the rail, an outer sleeve in the tipping bucket 22 is pushed to the side chute 14 through an outlet at one end of the tipping bucket 22, and the outer sleeve is discharged through the side chute 14.

In order to facilitate the detachment and replacement, preferably, a coupling hook 16 is arranged between the pushing trolley 15 and the push rod 17, one end of the coupling hook 16 is hinged to the pushing trolley 15, and the other end is hung to the push rod 17.

Of course, the outer sleeve of the small-assembly spent fuel rod 2 or the large-assembly spent fuel rod 2 after being cut is not cracked, so that the screening or the cleaning of the sieve is not needed, namely, the spent fuel rod 2 is positioned in the spent fuel sieve, and the spent fuel rod 2 in the spent fuel sieve is poured into the lower chute 7. As shown in fig. 3, 4 and 6, the tipping screen 9 is movably mounted on the base 10 through a first rotating shaft, which is arranged in the middle of the tipping screen 9; the guide sieve 5 is movably mounted on the base 10 through a second rotating shaft, the second rotating shaft is arranged at the top end of the guide sieve 5, rocking bars 12 are connected to the first rotating shaft and the second rotating shaft, a connecting rod 11 is arranged between the two rocking bars 12, and two ends of the connecting rod 11 are hinged to the corresponding rocking bars 12; a tilt drive is also provided to drive the rocker 12 in oscillation. One of the rockers 12 swings, the sieve corresponding to the rocker 12 rotates around the rotating shaft thereof, and simultaneously, the connecting rod 11 drives the other rocker 12 to swing, and the corresponding sieve rotates around the rotating shaft thereof. In the invention, the tipping screen 9 and the guide screen 5 are simultaneously turned over through the rocker 12 and the connecting rod 11, and the materials on the tipping screen 9 and the guide screen 5 are all poured into the lower chute 7.

The tipping driving device comprises a tipping hydraulic cylinder 20, a swing rod 19 and a spline shaft 13, one end of the spline shaft 13 is connected with the swing rod 19, the other end of the spline shaft 13 is inserted into the tipping sieve 9, and the other end of the swing rod 19, which is connected with the spline shaft 13, is hinged with the tipping hydraulic cylinder 20. The structure of the tipping drive device enables the tipping hydraulic cylinder 20 and the pushing hydraulic cylinder 18 to be arranged in an operation chamber, and a protective wall can be arranged between the operation chamber and a hot chamber for screening the spent fuel rods 2.

When the equipment is replaced, in an operation room, the connecting pin shaft of the axial positioning block on the spline and the tipping hydraulic cylinder 20 is manually removed, the spline shaft 13 is pulled outwards to separate the spline shaft 13 from the tipping sieve 9, then the base 10 is lifted away from the lower chute 7 by the travelling crane and then is lifted into a new sieve, the spline shaft 13 is pushed inwards to connect the spline shaft 13 with the tipping sieve 9, and the sieve replacement is completed.

When the pushing trolley is replaced, in an operation room, a connecting pin shaft of the push rod 17 and the pushing hydraulic cylinder 18 is manually removed, the push rod 17 is pulled outwards, the pushing trolley 15 is pulled to the maintenance position, then the pushing trolley 15 is hung away by a crane, a new pushing trolley 15 is replaced, and the push rod 17 is manually pushed inwards and pushed into the hook, so that the replacement of the pushing trolley 15 is completed.

Because the tipping driving device and the outer sleeve guide row structure adopt modularization and are free from bolt connection, the manual operation and replacement time in the hot chamber is greatly reduced.

In order to smoothly guide the spent fuel rods 2 sheared by the spent fuel shearing machine 1 into the guide screen 5, the guide screen device preferably further comprises a guide groove 3 and a slide carriage 4, wherein the guide groove 3 is obliquely arranged, the top end of the guide groove is a spent fuel inlet end, and the bottom end of the guide groove is a spent fuel outlet end; the slide carriage is positioned between the guide groove 3 and the guide sieve 5, one end of the slide carriage corresponds to the spent fuel outlet end of the guide groove 3, and the other end of the slide carriage extends downwards to the guide sieve 5 in an inclined mode. According to the structure, the spent fuel rod 2 sheared by the spent fuel shearing machine 1 slides into the slide carriage 4 through the guide groove 3, and then falls to the guide sieve 5 from the slide carriage 4 by means of gravity, and falls for one time on the guide sieve 5 for sieving.

Preferably, the two sides of the base 10 are provided with side guide plates 8, and the guide groove 3 and the slide carriage 4 are both arranged on the side guide plates 8; the fixed screen 6 is pressed on the base 10 through the side guide plate 8. The side guide plate 8 not only plays a role of supporting the guide groove 3 and the slide carriage 4, but also ensures that the fixed screen 6 is more reliably installed.