WO2013053128A1 - 一种下管座过滤装置及使用该装置的防异物下管座 - Google Patents

一种下管座过滤装置及使用该装置的防异物下管座 Download PDF

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Publication number
WO2013053128A1
WO2013053128A1 PCT/CN2011/080768 CN2011080768W WO2013053128A1 WO 2013053128 A1 WO2013053128 A1 WO 2013053128A1 CN 2011080768 W CN2011080768 W CN 2011080768W WO 2013053128 A1 WO2013053128 A1 WO 2013053128A1
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Prior art keywords
fluid
straight section
filter device
inlet
channels
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PCT/CN2011/080768
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English (en)
French (fr)
Inventor
禹文池
李伟才
周跃民
吕先锋
郭严
刘雨利
Original Assignee
中科华核电技术研究院有限公司
中国广东核电集团有限公司
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Application filed by 中科华核电技术研究院有限公司, 中国广东核电集团有限公司 filed Critical 中科华核电技术研究院有限公司
Priority to PCT/CN2011/080768 priority Critical patent/WO2013053128A1/zh
Priority to EP11873994.5A priority patent/EP2642488B1/en
Priority to CN201180059198.5A priority patent/CN103403811B/zh
Priority to ES11873994.5T priority patent/ES2624269T3/es
Priority to US13/978,686 priority patent/US20130279642A1/en
Publication of WO2013053128A1 publication Critical patent/WO2013053128A1/zh

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    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C3/00—Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements
    • G21C3/30—Assemblies of a number of fuel elements in the form of a rigid unit
    • G21C3/32—Bundles of parallel pin-, rod-, or tube-shaped fuel elements
    • G21C3/322—Means to influence the coolant flow through or around the bundles
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C3/00—Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements
    • G21C3/30—Assemblies of a number of fuel elements in the form of a rigid unit
    • G21C3/32—Bundles of parallel pin-, rod-, or tube-shaped fuel elements
    • G21C3/3206—Means associated with the fuel bundle for filtering the coolant, e.g. nozzles, grids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/01—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements
    • B01D29/03—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements self-supporting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
    • B01D35/02—Filters adapted for location in special places, e.g. pipe-lines, pumps, stop-cocks
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C3/00—Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements
    • G21C3/30—Assemblies of a number of fuel elements in the form of a rigid unit
    • G21C3/32—Bundles of parallel pin-, rod-, or tube-shaped fuel elements
    • G21C3/33—Supporting or hanging of elements in the bundle; Means forming part of the bundle for inserting it into, or removing it from, the core; Means for coupling adjacent bundles
    • G21C3/3305—Lower nozzle
    • 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

Definitions

  • the present invention relates to a nuclear reactor, and more particularly to a lower header filter device and a foreign matter prevention header for a fuel assembly of a light water reactor nuclear power plant.
  • the fuel assembly of the light water reactor nuclear power plant generally includes five major components: the upper pipe socket, the guide pipe, the grid, the fuel rod and the lower pipe socket.
  • the grid is typically assembled from strips with 17 x 17 square grids.
  • the 25 guide tubes are placed in parallel in a partial grid grid, which successfully separates the guide tubes and controls the spacing between the guide tubes, thus forming a bundle of tubes.
  • the upper and lower ends of the tube bundle are fixed by the upper tube seat and the lower tube seat to form a fuel assembly skeleton.
  • the fuel rods are placed in parallel in a grid that is not occupied by the guide tubes.
  • the coolant flows from the lower part of the lower header through the fuel rod, slowing down the neutrons and taking away the fission energy, and flows out from the upper tube seat. Since the coolant usually entrains foreign matter, it is easy to cause certain abrasion on the fuel rod, etc., and has a great safety hazard.
  • the main structure includes an anti-foreign material panel and a lower header having a rib structure.
  • the lower header is composed of four legs and a connecting plate.
  • the foreign matter prevention board covers the upper surface of the upper tube seat for filtering foreign matter in the coolant to prevent foreign matter from abrading the fuel rod.
  • the apparatus for preventing foreign matter in the fuel assembly includes a lower header of a connecting plate with a small round hole and a foreign matter filtering bottom frame.
  • the small round holes on the lower tube connection plate filter large-sized foreign objects, and the foreign matter prevention frame filters the remaining small foreign matter.
  • the reduction in the flow cross-sectional area causes unnecessary pressure drop loss.
  • the pressure drop generated by the small round hole lower seat and the anti-foreign material frame is significantly larger than the pressure drop of the original scheme 1.
  • the monolithic stainless steel sheets are assembled into the connecting plates of the lower tube seat, and the flow path is deflected to allow foreign matter to be filtered.
  • the gap between the thin plates should not be too large. In this way, the fluid is in excessive contact with the wall surface during the flow, and the resistance along the path is large.
  • the above solution filters the foreign matter in the coolant, and there is still a problem that the object may be struck/scratched by the sharp object, or the pressure drop is too large, and the resistance along the path is large.
  • the technical problem to be solved by the present invention is to provide a lower header filter device that effectively filters foreign matter, has a small pressure drop, and an anti-foreign material lower header that uses the light pipe reactor of the lower header filter device.
  • the present invention can also provide a lower header filter device having a small resistance along the path and capable of holding and retaining foreign matter in the coolant, and a foreign matter prevention base of the light water reactor using the lower header filter device .
  • the technical solution adopted by the present invention to solve the technical problem thereof is to provide a lower tube seat filtering device, which comprises a plurality of unit plates which are successively combined; and a fluid passage which is formed between the adjacent adjacent unit plates;
  • the fluid passage includes a plurality of spaced apart straight section fluid inlets, a plurality of spaced apart straight section fluid outlets, and a fluid subchannel connecting the straight section fluid inlet and the straight section fluid outlet;
  • An outlet section of each of the straight section fluid inlets in the intermediate position is in communication with the two fluid sub-channels, respectively; an inlet section of each of the straight section fluid outlets in the intermediate position is in communication with two of the fluid sub-channels, respectively.
  • the straight section fluid inlet is a pocket-shaped inlet.
  • the straight section fluid inlet and the straight section fluid outlet are staggered on both sides of the fluid sub-channel;
  • One of the straight section fluid inlets is in communication with two of the fluid sub-channels, and the two fluid sub-channels are in communication with two adjacent ones of the straight section fluid outlets, respectively.
  • the straight section fluid inlet and the straight section fluid outlet position are arranged opposite each other on both sides of the fluid sub-channel.
  • the fluid sub-channel includes a plurality of moisture inlet channels, a plurality of moisture outlet channels, and a plurality of convergence channels;
  • Two adjacent inlet moisture passages communicating with one of the straight section fluid inlets while communicating with one of the convergence channels; and wherein the convergence channels are simultaneously in communication with two of the outlet moisture passages, the two The outlet moisture passage simultaneously communicates with the straight section fluid outlet that is directly opposite the straight section fluid inlet.
  • the fluid sub-channels are two or more layers, and each of the fluid sub-channels includes the inlet moisture passage, the outlet moisture passage, and the convergence passage;
  • a plurality of intermediate converging channels are disposed between the adjacent two layers of fluid sub-channels, and the intermediate converging channels are connected to the adjacent two outlet moisture channels and the inflow water channels.
  • the unit plate is a metal plate having a scoop structure.
  • the material of the metal plate material is stainless steel, austenitic nickel alloy or Inconel.
  • the scoop-shaped structure of the adjacent unit plates includes inlet and outlet grooves respectively provided on upper and lower sides of the unit plate, and in the inlet groove a sub-channel groove connected to two adjacent ones of the outlet grooves on both sides;
  • a hollow space between the inlet grooves of the two adjacent unit plates forms the straight section fluid inlet, and the two outlets of the adjacent unit plates are concave.
  • the hollow space between the slots forms a straight section of fluid outlet, and a hollow space between the two sub-channel recesses of the adjacent unit plates forms the fluid sub-channel.
  • the edge of the unit plate is provided with a low pressure drop structure;
  • the low pressure drop structure includes one or more gradient inclined segments formed at the edge of the cell plate, and/or A circular arc segment formed by the edge of the unit board.
  • the unit plates are joined together to form a three-dimensional network structure, and the shape of the straight section fluid inlet and the straight section fluid outlet of the three-dimensional network structure are diamond, square, and circle. Shape or elliptical; and the unit plates are brazed together, and the brazing zone is elongated.
  • the present invention also provides a foreign material prevention lower pipe socket of a light water reactor, comprising a connecting plate and a bracket mounted on a lower side of the connecting plate; and the upper surface of the connecting plate is further provided with any of the above Lower header filter unit.
  • the upper and lower sides of the lower tube filter device are provided with filter ribs at the same time or separately; the filter rib portion partially blocks the straight section fluid inlet and/or the straight section fluid Export.
  • the invention has the following beneficial effects: forming a plurality of divided straight-line fluid inlets and straight-section fluid outlets by unit plate splitting, and connecting the straight-stage fluid inlet and the straight-stage fluid outlet through the fluid sub-channel to control the coolant flow direction, Preventing unnecessary eddy currents from being generated, so that the pressure loss is effectively controlled; the straight-stage fluid inlet and the straight-stage fluid outlet filter large foreign matter, enter the fluid sub-channel, and filter the fluid sub-channel again, so that the foreign matter can be sufficiently filter.
  • the straight section fluid inlet and the straight section fluid outlet, and the separately arranged fluid sub-channels can realize the segmentation and classification of foreign matter, and also realize the function of retaining foreign matter; in addition, the straight section fluid inlet and the fluid outlet adopt a nearly circular design.
  • the flow path can be reduced along the path, avoiding the phenomenon of sudden shrinkage and sudden expansion in the prior art; at the same time, the low pressure drop design of the cell plate edge, the split design of the fluid subchannel, the fluid is redistributed, and the balance is balanced.
  • the pressure drop of the adjacent flow channel, the pressure drop pre-balancing measure is beneficial to control the cross flow caused by the pressure drop in the section downstream, and achieve the effect of controlling unnecessary pressure drop loss.
  • Figure 1 is a schematic view of a lower anti-foreign material stem of the present invention
  • Figure 2 is a partial schematic view showing the unit plate of the first embodiment of the lower header filter device of the present invention
  • Figure 3 is a schematic view of the two unit plates of the first embodiment of the lower header filter device of the present invention.
  • Figure 4 is a schematic view of a flow path of a first embodiment of the lower header filter device of the present invention.
  • Figure 5 is a schematic view showing a form of a cell plate edge of the first embodiment of the lower header filter device of the present invention.
  • Figure 6 is a schematic view showing another form of the cell plate edge of the first embodiment of the lower header filter device of the present invention.
  • Figure 7 is a schematic view showing another form of the cell plate edge of the first embodiment of the lower header filter device of the present invention.
  • Figure 8 is a schematic view of a flow path of a second embodiment of the lower header filter device of the present invention.
  • Figure 9 is a schematic view of a flow path of a third embodiment of the lower header filter device of the present invention.
  • Figure 10 is a schematic view showing a flow path of a fourth embodiment of the lower header filter device of the present invention.
  • Figure 11 is a schematic view of a flow path of a fifth embodiment of the lower header filter device of the present invention.
  • Figure 12 is a schematic view showing another form of the flow path of the fifth embodiment of the lower header filter device of the present invention.
  • Figure 13 is a schematic view showing a flow path of a sixth embodiment of the lower header filter device of the present invention.
  • Fig. 14 is a schematic view showing the addition of a filter rib according to the lower anti-foreign material stem of the present invention.
  • the first embodiment of the lower header filter device of the present invention can be used in the anti-foreign material lower header of the light water reactor, as shown in FIG.
  • the anti-foreign material lower tube holder includes a connecting plate 10, a bracket (not shown) mounted on the lower side of the connecting plate 10, and a lower header filtering device 30 and the like disposed on the upper surface of the connecting plate 10, through the lower header filtering device 30.
  • the foreign matter in the coolant is filtered to prevent damage of the fuel rod or the like by foreign matter in the coolant, resulting in an unnecessary accident.
  • the lower header can also include other components, and the present invention does not relate to such components, and therefore will not be described again.
  • the lower header filter device 30 includes a plurality of unit plates 31 which are sequentially assembled, and a fluid passage is formed between the adjacent unit plates 31 after the splitting, so that the coolant can flow through and utilize the fluid passage. The foreign matter in the coolant is filtered.
  • the unit plate 31 is a metal plate with a scoop structure, and the material of the metal plate may be stainless steel, austenitic nickel alloy, Inconel or other suitable metal.
  • the edges of the scoop structure between the two unit plates 31 are joined by brazing, and the brazing area is elongated in shape.
  • the plurality of unit plates 31 are connected to form a solid three-dimensional network structure, and the shape of the straight section fluid inlet and the straight section fluid outlet of the three-dimensional network structure are diamond, square, circular, elliptical or other shapes.
  • the mesh structure can significantly increase the strength of the connecting plate 10 and prevent high-speed foreign matter from colliding.
  • the scoop structure includes an inlet groove 311 and an outlet groove 312 which are alternately arranged on the upper and lower sides of the unit plate 31, and a sub-channel recess which communicates to the adjacent two outlet grooves 312 on both sides of the inlet groove 311.
  • the hollow space between the inlet grooves 311 of the adjacent two unit plate plates 31 forms a straight section fluid inlet 314, and the outlets of the adjacent two unit cell plates 31 are concave.
  • the hollow space between the slots 312 forms a straight section fluid outlet 315, and the hollow space between the sub-channel recesses 313 of the adjacent two unit cell plates 31 forms a fluid sub-channel 316.
  • the straight section fluid inlet 314 forms a pocket-shaped inlet, so that the foreign matter in the coolant can be effectively clamped and retained, thereby achieving a good filtering effect.
  • the filter ribs 32 may be disposed at the same time or separately on the upper and lower sides of the lower header filter device, as shown in FIG.
  • the filter ribs 32 partially block the straight section fluid inlet 314 and/or the straight section fluid outlet 315, thereby subdividing the straight section fluid inlet 314 and/or the straight section fluid outlet 315 to enhance the filtering effect.
  • the straight section fluid inlets 314 are arranged side by side in the zone I, while the straight section fluid outlets 315 are arranged side by side in the zone III; the fluid subchannels 316 are arranged in zone II, the straight section of the fluid inlet 314 and straight
  • the segment fluid outlet 315 is in communication.
  • the straight section fluid inlet 314 and the straight section fluid outlet 315 are staggered on the upper and lower sides of the unit plate 31, and the straight section of the inlet and outlet controls the coolant flow direction to prevent unnecessary eddy currents and pressure loss. Get effective control.
  • Two fluid sub-channels 316 are in communication with a straight section fluid inlet 314, and the two fluid sub-channels 316 are in communication with adjacent two straight section fluid outlets 315, respectively, such that large foreign bodies are introduced at the straight section fluid inlet 314.
  • the fluid sub-channel 316 is deflected, and the fine foreign matter in the coolant is again filtered by the deflected fluid sub-channel 316, the flow direction of which is indicated by the arrow in the figure.
  • the straight-section fluid inlet 314 as shown in the figure forms a smooth bag-like structure, has the function of holding and retaining foreign matter in the coolant, and realizes segmentation, classification and filtering of foreign matter by the fluid sub-channel 316, and also realizes the function of retaining foreign matter.
  • Segmentation of foreign matter reduces the risk of clogging the filter unit due to all foreign matter being filtered, and retaining and retaining foreign matter in the lower header of the fuel assembly, moving to the outside of the stack along with the discharge of the fuel assembly, cooling the entire circuit The total amount of foreign matter in the agent is greatly reduced.
  • the shape of the straight section fluid inlet 314 is nearly circular, so that the resistance along the flow path can be reduced without the phenomenon of sag, sudden expansion and the like.
  • the low pressure drop structure may be one or more sections of continuously graded inclined sections 317 formed at the edge of the unit plate 31, and/or a circular arc section 318 formed at the edge of the unit plate 31, as shown in Figures 5-7, to reduce fluid Flow through the resistance.
  • the deflection zone of the fluid sub-channel 316 the fluid is redistributed, balancing the pressure drop of the adjacent flow channel, and this pressure drop pre-balancing measure is beneficial to the downstream of the control component due to the pressure drop in the section.
  • the resulting cross flow achieves the effect of controlling unnecessary pressure drop losses.
  • the DC channel design is adopted for the straight section fluid outlet 315 to control the turbulent flow of the downstream fluid.
  • a second embodiment of the lower header filter device 30 of the present invention differs from the first embodiment in that the straight section fluid inlet 314 and the straight section fluid outlet 315 are different in size. As shown, the length of the straight section fluid inlet 314 is less than the length of the straight section fluid outlet 315, thereby making the outflow more stable, avoiding unnecessary eddy currents, etc., and effectively controlling pressure loss.
  • a third embodiment of the lower header filter device 30 of the present invention differs from the first embodiment in that the straight section fluid inlet 314 and the straight section fluid outlet 315 are different in size. As shown, the length of the straight section fluid inlet 314 is greater than the length of the straight section fluid outlet 315, thereby allowing the coolant to stay at the straight section fluid inlet 314 for a longer period of time, more effectively filtering foreign matter in the coolant, and improving filtration. .
  • a fourth embodiment of the lower header filter device 30 of the present invention differs from the first embodiment in that the angle of inclination of the fluid sub-channels 316 is different.
  • the fluid sub-channel 316 of the present embodiment has a small angle of inclination and an angle of about 10-20 degrees with the direction of the incoming flow, that is, the steering of the fluid is more gentle, thereby avoiding fluid diversion. Large, the problem of increased resistance along the way.
  • a fifth embodiment of the lower header filter device 30 of the present invention which differs from the first embodiment in the arrangement of the straight section fluid inlet 314, the straight section fluid outlet 315 and the fluid subchannel 316.
  • the location is different.
  • the straight section fluid inlet 314 and the straight section fluid outlet 315 are aligned in opposite directions on both sides of the fluid sub-channel 316.
  • the fluid sub-channel 316 includes a plurality of influent channels 3161, a plurality of outflow channels 3162, and a plurality of converging channels 3162, that is, the fluid sub-channels 316 are divided into a multi-layer structure, which is two layers in this embodiment.
  • two adjacent intake moisture passages 3161 communicating with a straight section fluid inlet 314 are simultaneously in communication with one of the condensation passages 3162; and the converging passages 3162 are simultaneously in communication with the two outlet moisture passages 3162, the two The outlet moisture passage 3162 simultaneously communicates with the straight section fluid outlet 315 that is opposite the straight section fluid inlet 314.
  • a sixth embodiment of the lower header filter device 30 of the present invention which differs from the fourth embodiment in that the fluid sub-channel 316 is a plurality of layers, and each layer of fluid sub-channels 316 includes a water inlet passage 3161, an outlet moisture passage 3162, and a condensation passage 3162; and a plurality of intermediate condensation passages 3162 are provided between the adjacent two-layer fluid distribution passages 316, and the intermediate condensation passages 3162 communicate with the adjacent two outlet moisture passages. 3162 and the inlet moisture channel 3161.
  • the filtration capacity of the fluid sub-channels 316 can be further increased and the fluids can be better redistributed to balance the pressure drop across adjacent channels.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Nozzles (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Filtration Of Liquid (AREA)
  • Jet Pumps And Other Pumps (AREA)
  • Structure Of Emergency Protection For Nuclear Reactors (AREA)

Abstract

一种可用于轻水反应堆核电站燃料组件的下管座过滤装置及防异物下管座，该下管座过滤装置(30)包括多片依次拼合的单元板(31)；拼合的相邻单元板(31)之间形成贯通的流体通道；流体通道包括多个分隔排列的直段流体入口(314)、多个分隔排列的直段流体出口(315)、及连通直段流体入口(314)和直段流体出口(315)的流体分通道(316)；中间位置的每一所述直段流体入口(314)的出口段分别与两个所述流体分通道(316)连通；中间位置的每一所述直段流体出口(315)的入口段分别与两个所述流体分通道(316)连通。利用直段流体入口、直段流体出口、流体分通道等，控制了冷却剂流向，防止产生不必要的涡流，使得压力损失得到有效控制；将大型的异物过滤后，进入流体分通道，通过将流体分通道再次过滤，实现了分段过滤，从而可以提高过滤效果。

Description

一种下管座过滤装置及使用该装置的防异物下管座 【技术领域】
本发明涉及核反应堆，更具体地说，涉及一种可用于轻水反应堆核电站燃料组件的下管座过滤装置及防异物下管座。
【背景技术】
轻水堆核电站燃料组件一般包括上管座、导向管、格架、燃料棒和下管座等五大部件。该格架一般由条带组装，具有17×17个方形栅格。25根导向管平行放置在部分格架栅格中，格架将导向管成功隔开，控制了导向管之间间距，这样就构成了管束。管束上下两端由上管座和下管座固定，组成了燃料组件骨架。燃料棒平行放置在没有被导向管占据的栅格中。冷却剂从下管座下部流入流经燃料棒，将中子慢化并带走裂变能，从上管座流出。由于冷却剂通常会夹带异物，容易对燃料棒等造成一定的磨蚀，具有较大的安全隐患。
为了过滤冷却剂中的异物，现有出现了一些过滤技术，如美国专利US5283812、US7149272B2、US5030412等。如第一种异物过滤下管座方案1中，主要结构包括防异物板和具有板筋结构的下管座。下管座由四个支腿、连接板构成。防异物板覆盖在上管座上表面，用于过滤冷却剂中的异物，防止异物磨蚀燃料棒。在该方案中，当体型较大或/和尖锐的异物（如螺钉、螺帽、金属切削物）以高速去撞击防异物板时，有可能划破防异物板，造成燃料组件的防异物装置失效，进而造成异物磨损燃料棒。
在第二种的异物过滤下管座方案2中，燃料组件中防异物的装置有：带小圆孔的连接板的下管座、异物过滤底部格架。下管座连接板上的小圆孔过滤大尺寸的异物，防异物格架过滤剩余较小的异物。在本方案中，在下管座连接板出入口处，流通截面积减少造成了不必要的压降损失。小圆孔下管座和防异物格架产生的压降明显大于原有方案1的压降。
在第三种过滤装置中，单片式不锈钢薄板组装成下管座的连接板，流道形成了偏折，异物得以过滤。在该方案中，为了提升下管座异物过滤效率，则薄板之间的间隙不能太大。这样流体在流动过程中与壁面接触过多，沿程阻力较大。
上述方案对冷却剂中的异物进行过滤，仍然存在要么可能被锐物体撞击/划破防异物板，要么压降过大、沿程阻力较大的问题。
【发明内容】
本发明要解决的技术问题在于，提供一种有效过滤异物、压降小的下管座过滤装置、以及使用该下管座过滤装置的轻水反应堆的防异物下管座。
进一步的，本发明还能提供一种沿程阻力小、并可夹持、留存冷却剂中异物的下管座过滤装置、以及使用该下管座过滤装置的轻水反应堆的防异物下管座。
本发明解决其技术问题所采用的技术方案是：提供一种下管座过滤装置，包括多片依次拼合的单元板；拼合的相邻所述单元板之间形成贯通的流体通道；
所述流体通道包括多个分隔排列的直段流体入口、多个分隔排列的直段流体出口、以及连通所述直段流体入口和直段流体出口的流体分通道；
中间位置的每一所述直段流体入口的出口段分别与两个所述流体分通道连通；中间位置的每一所述直段流体出口的入口段分别与两个所述流体分通道连通。
在本发明的下管座过滤装置中，所述直段流体入口为袋形入口。
在本发明的下管座过滤装置中，所述直段流体入口和直段流体出口交错排列在所述流体分通道的两侧；
一个所述直段流体入口连通有两个所述流体分通道，并且，所述两个流体分通道分别与相邻的两个所述直段流体出口连通。
在本发明的下管座过滤装置中，所述直段流体入口和直段流体出口位置相正对排列在所述流体分通道的两侧。
在本发明的下管座过滤装置中，所述流体分通道包括多个进水分通道、多个出水分通道、以及多个汇聚通道；
与一个所述直段流体入口连通的两个相邻所述进水分通道，同时与一个所述汇聚通道连通；并且，所述汇聚通道同时与两个所述出水分通道连通，所述两个出水分通道同时连通与该所述直段流体入口正对的所述直段流体出口。
在本发明的下管座过滤装置中，所述流体分通道为两层或多层，每一层所述流体分通道均包括所述进水分通道、出水分通道、以及汇聚通道；
并且在相邻的两层流体分通道之间设有多个中间汇聚通道，所述中间汇聚通道连通相邻的两出水分通道和进水分通道。
在本发明的下管座过滤装置中，所述单元板为带有瓢状结构的金属板材。
在本发明的下管座过滤装置中，所述金属板材的材料为不锈钢、奥氏体镍络合金或因科镍。
在本发明的下管座过滤装置中，相邻的所述单元板的瓢状结构包括分别在所述单元板的上下两侧设置的入口凹槽和出口凹槽、以及在所述入口凹槽两侧连通至相邻的两个所述出口凹槽的分通道凹槽；
所述单元板拼合后，两片相邻的所述单元板的所述入口凹槽之间的中空空间形成了所述直段流体入口，两片相邻的所述单元板的所述出口凹槽之间的中空空间形成了直段流体出口，两片相邻的所述单元板的所述分通道凹槽之间的中空空间形成了所述流体分通道。
在本发明的下管座过滤装置中，所述单元板的边缘设有低压降结构；所述低压降结构包括在所述单元板边缘形成的一段或多段渐变倾斜段、和/或在所述单元板边缘形成的圆弧段。
在本发明的下管座过滤装置中，所述单元板拼合形成立体网状结构，所述立体网状结构的所述直段流体入口和所述直段流体出口的形状为菱形、方形、圆形或椭圆形；并且所述单元板之间采用钎焊连接，钎焊区形状为长条形。
本发明还提供一种轻水反应堆的防异物下管座，包括连接板、以及安装在所述连接板下侧的支架；在所述连接板的上表面还设有上述任一项所述的下管座过滤装置。
在本发明的防异物下管座中，所述下管座过滤装置的上下两侧同时或分别设置有过滤筋条；所述过滤筋条部分遮挡所述直段流体入口和/或直段流体出口。
实施本发明具有以下有益效果：通过单元板拼合形成多个分隔排列的直段流体入口和直段流体出口，并通过流体分通道连通直段流体入口和直段流体出口，控制了冷却剂流向，防止其产生不必要的涡流，使得压力损失得到有效控制；直段流体入口和直段流体出口将大型的异物过滤后，进入流体分通道，通过将流体分通道再次过滤，从而可以将异物充分的过滤。
另外，直段流体入口和直段流体出口、分开设置的流体分通道，可以实现分段分类过滤异物，还实现了留存异物的功能；另外，直段流体入口、流体出口采用近乎圆形的设计，流道得沿程阻力得以降低，避免了现有技术中的突缩、突扩等现象；同时，对单元板边缘进行低压降设计，流体分通道的分流设计，流体进行了重新分配，平衡了相邻流道的压降，这种压降预平衡措施有利于控制组件下游因为截面内压降原因而引起的横流，达到控制不必要的压降损失的效果。
【附图说明】
下面将结合附图及实施例对本发明作进一步说明，附图中：
图1是本发明防异物下管座的示意图；
图2是本发明下管座过滤装置的第一实施例的单元板的局部示意图；
图3是本发明下管座过滤装置的第一实施例的两个单元板拼合后的示意图；
图4是本发明下管座过滤装置的第一实施例的流道的示意图；
图5是本发明下管座过滤装置的第一实施例的单元板边缘的一种形式的示意图；
图6是本发明下管座过滤装置的第一实施例的单元板边缘的另一种形式的示意图；
图7是本发明下管座过滤装置的第一实施例的单元板边缘的另一种形式的示意图；
图8是本发明下管座过滤装置的第二实施例的流道的示意图；
图9是本发明下管座过滤装置的第三实施例的流道的示意图；
图10是本发明下管座过滤装置的第四实施例的流道的示意图；
图11是本发明下管座过滤装置的第五实施例的流道的示意图；
图12是本发明下管座过滤装置的第五实施例的流道另一种形式的示意图；
图13是本发明下管座过滤装置的第六实施例的流道的示意图；
图14是本发明防异物下管座增加过滤筋条的示意图。
【具体实施方式】
本发明的下管座过滤装置的第一实施例，可用于轻水反应堆的防异物下管座中，如图1所示。该防异物下管座包括连接板10、安装在连接板10下侧的支架（图未示）、以及设置在连接板10上表面的下管座过滤装置30等，通过下管座过滤装置30对冷却剂中的异物进行过滤，从而避免冷却剂中的异物对燃料棒等的损坏，而造成不必要的事故。当然，该下管座还可以包括其他的组件，本发明不涉及该等组件，故不赘述。
如图2所示，该下管座过滤装置30包括多片依次拼合的单元板31，拼合后相邻的单元板31之间形成贯通的流体通道，使得冷却剂能够流过，并利用流体通道对冷却剂中的异物进行过滤。
在本实施例中，该单元板31为带有瓢状结构的金属板材，该金属板材的材料可以选用不锈钢、奥氏体镍络合金、因科镍或其他合适的金属。当两个单元板31拼合时，两单元板31之间的瓢状结构的边缘通过钎焊连接，钎焊区形状为长条形。多片单元板31连接后组成了牢固的立体网状结构，立体网状结构的所述直段流体入口和所述直段流体出口的形状为菱形、方形、圆形、椭圆形或其他形状，该网状结构能显著提高连接板10强度，防止高速异物撞击失效。
该瓢状结构包括分别在单元板31的上下两侧交错设置的入口凹槽311和出口凹槽312、以及在入口凹槽311两侧连通至相邻的两个出口凹槽312的分通道凹槽313。如图3所示，在单元板31拼合后，相邻的两片单元板31的入口凹槽311之间的中空空间形成了直段流体入口314，相邻的两片单元板31的出口凹槽312之间的中空空间形成了直段流体出口315，相邻的两片单元板31的分通道凹槽313之间的中空空间形成了流体分通道316。
由于该入口凹槽311为接近于圆形的瓢状，使得该直段流体入口314形成袋形入口，从而可以有效的夹持并留置冷却剂中的异物，起到良好的过滤效果。
进一步的，在该下管座过滤装置的上下两侧可以同时或分别设置过滤筋条32，如图14所示。该过滤筋条32部分地遮挡直段流体入口314和/或直段流体出口315，从而将直段流体入口314和/或直段流体出口315细分，从而起到强化过滤效果的作用。
如图4所示，直段流体入口314并排隔开设置在I区，而直段流体出口315并排隔开设置在III区；流体分通道316设置在II区，将直段流体入口314和直段流体出口315连通。在本实施例中，该直段流体入口314和直段流体出口315交错排列在单元板31的上下两侧，出入口的直段控制了冷却剂流向，防止其产生不必要的涡流，压力损失的得到有效控制。
与一个直段流体入口314连通有两个流体分通道316，并且，该两个流体分通道316分别与相邻的两个直段流体出口315连通，从而在直段流体入口314将大型的异物过滤后，进入流体分通道316形成偏折，利用偏折的流体分通道316将冷却剂中的细小异物再次过滤，其流向如图中箭头所示。如图所示的直段流体入口314形成圆滑的袋状结构，具有夹持并留存冷却剂中异物功能，并且利用流体分通道316实现了分段、分类过滤异物，还实现了留存异物的功能。分段过滤异物，降低了由于异物全部在一次过滤后堵塞过滤装置的风险，并且夹持和留存在燃料组件下管座中异物，伴随着燃料组件卸料一起移至堆外，整个一回路冷却剂中的异物总量大幅下降。
该直段流体入口314的形状近乎于圆形，使得流道的沿程阻力得以降低，而不存在突缩、突扩等现象。另外，还可以同时在单元板31的边缘设置低压降结构，。该低压降结构可以为在单元板31边缘形成的一段或多段连续渐变的倾斜段317、和/或在单元板31边缘形成的圆弧段318，如图5-7所示，起到降低流体流过阻力的作用。
另外，在第II区，流体分通道316的偏折区，流体进行了重新分配，平衡了相邻流道的压降，这种压降预平衡措施有利于控制组件下游因为截面内压降原因而引起的横流，达到控制不必要的压降损失的效果。同时对直段流体出口315采用直流道设计，控制了下游流体的紊流。
如图8所示，是本发明的下管座过滤装置30的第二实施例，其与第一实施例的区别在于，直段流体入口314和直段流体出口315的尺寸不同。如图所示，直段流体入口314的长度小于直段流体出口315的长度，从而使得出流更加的稳定，避免了产生不必要的涡流等，有效控制压力损失。
如图9所示，是本发明的下管座过滤装置30的第三实施例，其与第一实施例的区别在于，直段流体入口314和直段流体出口315的尺寸不同。如图所示，直段流体入口314的长度大于直段流体出口315的长度，从而使得冷却剂在直段流体入口314处停留更长时间，更有效的过滤冷却剂中的异物，提高过滤效果。
如图10所示，是本发明的下管座过滤装置30的第四实施例，其与第一实施例的区别在于，流体分通道316的倾斜角度不同。如图所示，本实施例的流体分通道316的倾斜角度较小，与来流方向的夹角约为10-20度，也就是说流体的转向更加的平缓，从而使得避免了流体转向过大，沿程阻力增加的问题。
如图11所示，是本发明的下管座过滤装置30的第五实施例，其与第一实施例的区别在于，直段流体入口314、直段流体出口315和流体分通道316的设置位置等不同。在本实施例中，直段流体入口314和直段流体出口315位置相正对排列在流体分通道316的两侧。而流体分通道316包括多个进水分通道3161、多个出水分通道3162、以及多个汇聚通道3162，也就是说，将流体分通道316分为多层结构，本实施例为两层。
如图所示，与一个直段流体入口314连通的两个相邻进水分通道3161，同时与一个汇聚通道3162连通；并且，汇聚通道3162同时与两个出水分通道3162连通，该两个出水分通道3162同时连通与该直段流体入口314正对的直段流体出口315。通过流体分通道316的增加设置，可有效地增加了流体分通道316的过滤能力，并且对流体进行了更好的重新分配，平衡了相邻流道的压降。
可以理解的，该多个进水分通道3161、多个出水分通道3162、以及多个汇聚通道3162的形状可以根据需要进行调整，如图12所示。
如图13所示，是本发明的下管座过滤装置30的第六实施例，其与第四实施例的区别在于，该流体分通道316为多层，每一层流体分通道316均包括进水分通道3161、出水分通道3162、以及汇聚通道3162；并且在相邻的两层流体分通道316之间设有多个中间汇聚通道3162，中间汇聚通道3162连通相邻的两出水分通道3162和进水分通道3161。通过增加流体分通道316的层数，可进一步的增加了流体分通道316的过滤能力，并且对流体进行了更好的重新分配，平衡了相邻流道的压降。
可以理解的，上述各实施例的各技术特征之间可以进行结合、互用，而不受限制。

Claims (13)

  1. 一种下管座过滤装置，其特征在于，包括多片依次拼合的单元板；拼合的相邻所述单元板之间形成贯通的流体通道；
    所述流体通道包括多个分隔排列的直段流体入口、多个分隔排列的直段流体出口、以及连通所述直段流体入口和直段流体出口的流体分通道；
    中间位置的每一所述直段流体入口的出口段分别与两个所述流体分通道连通；中间位置的每一所述直段流体出口的入口段分别与两个所述流体分通道连通。
  2. 根据权利要求1所述的下管座过滤装置，其特征在于，所述直段流体入口为袋形入口。
  3. 根据权利要求1所述的下管座过滤装置，其特征在于，所述直段流体入口和直段流体出口交错排列在所述流体分通道的两侧；
    一个所述直段流体入口连通有两个所述流体分通道，并且，所述两个流体分通道分别与相邻的两个所述直段流体出口连通。
  4. 根据权利要求1所述的下管座过滤装置，其特征在于，所述直段流体入口和直段流体出口位置相正对排列在所述流体分通道的两侧。
  5. 根据权利要求4所述的下管座过滤装置，其特征在于，所述流体分通道包括多个进水分通道、多个出水分通道、以及多个汇聚通道；
    与一个所述直段流体入口连通的两个相邻所述进水分通道，同时与一个所述汇聚通道连通；并且，所述汇聚通道同时与两个所述出水分通道连通，所述两个出水分通道同时连通与该所述直段流体入口正对的所述直段流体出口。
  6. 根据权利要求5所述的下管座过滤装置，其特征在于，所述流体分通道为两层或多层，每一层所述流体分通道均包括所述进水分通道、出水分通道、以及汇聚通道；
    并且在相邻的两层流体分通道之间设有多个中间汇聚通道，所述中间汇聚通道连通相邻的两出水分通道和进水分通道。
  7. 根据权利要求1所述的下管座过滤装置，其特征在于，所述单元板为带有瓢状结构的金属板材。
  8. 根据权利要求7所述的下管座过滤装置，其特征在于，所述金属板材的材料为不锈钢、奥氏体镍络合金或因科镍。
  9. 根据权利要求7所述的下管座过滤装置，其特征在于，相邻的所述单元板的瓢状结构包括分别在所述单元板的上下两侧设置的入口凹槽和出口凹槽、以及在所述入口凹槽两侧连通至相邻的两个所述出口凹槽的分通道凹槽；
    所述单元板拼合后，两片相邻的所述单元板的所述入口凹槽之间的中空空间形成了所述直段流体入口，两片相邻的所述单元板的所述出口凹槽之间的中空空间形成了直段流体出口，两片相邻的所述单元板的所述分通道凹槽之间的中空空间形成了所述流体分通道。
  10. 根据权利要求1-9任一项所述的下管座过滤装置，其特征在于，所述单元板的边缘设有低压降结构；所述低压降结构包括在所述单元板边缘形成的一段或多段渐变倾斜段、和/或在所述单元板边缘形成的圆弧段。
  11. 根据权利要求1-9任一项所述的下管座过滤装置，其特征在于，所述单元板拼合形成立体网状结构，所述立体网状结构的所述直段流体入口和所述直段流体出口的形状为菱形、方形、圆形或椭圆形；并且所述单元板之间采用钎焊连接，钎焊区形状为长条形。
  12. 一种轻水反应堆的防异物下管座，包括连接板、以及安装在所述连接板下侧的支架；其特征在于，在所述连接板的上表面还设有权利要求1-10任一项所述的下管座过滤装置。
  13. 根据权利要求12所述的防异物下管座，其特征在于，所述下管座过滤装置的上下两侧同时或分别设置有过滤筋条；所述过滤筋条部分遮挡所述直段流体入口和/或直段流体出口。
PCT/CN2011/080768 2011-10-14 2011-10-14 一种下管座过滤装置及使用该装置的防异物下管座 WO2013053128A1 (zh)

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EP11873994.5A EP2642488B1 (en) 2011-10-14 2011-10-14 Bottom nozzle filter device and debris-resistant bottom nozzle using the device
CN201180059198.5A CN103403811B (zh) 2011-10-14 2011-10-14 一种下管座过滤装置及使用该装置的防异物下管座
ES11873994.5T ES2624269T3 (es) 2011-10-14 2011-10-14 Dispositivo de filtro de tobera inferior y tobera inferior resistente a los residuos que usa el dispositivo
US13/978,686 US20130279642A1 (en) 2011-10-14 2011-10-14 Bottom nozzle filtering device and debris-preventive bottom nozzle using the same

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EP2642488A4 (en) 2015-03-04
CN103403811B (zh) 2016-01-06
ES2624269T3 (es) 2017-07-13

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