WO2014094567A1 - 安全壳内置换料水箱过滤器系统 - Google Patents

安全壳内置换料水箱过滤器系统 Download PDF

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Publication number
WO2014094567A1
WO2014094567A1 PCT/CN2013/089204 CN2013089204W WO2014094567A1 WO 2014094567 A1 WO2014094567 A1 WO 2014094567A1 CN 2013089204 W CN2013089204 W CN 2013089204W WO 2014094567 A1 WO2014094567 A1 WO 2014094567A1
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WIPO (PCT)
Prior art keywords
filter
water tank
containment
debris
replacement water
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2013/089204
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English (en)
French (fr)
Inventor
朱京梅
邢继
王晓江
吴明
朱明华
张卫
龚钊
信天民
赵侠
王长东
荆春宁
王宏杰
李军
曲昌明
于凤云
杨晓丽
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China Nuclear Power Engineering Co Ltd
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China Nuclear Power Engineering Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from CN201210548088.1A external-priority patent/CN103028285B/zh
Priority claimed from CN201210549550XA external-priority patent/CN103047129A/zh
Application filed by China Nuclear Power Engineering Co Ltd filed Critical China Nuclear Power Engineering Co Ltd
Priority to GB1509986.4A priority Critical patent/GB2522822B/en
Priority to MYPI2015701933A priority patent/MY188132A/en
Publication of WO2014094567A1 publication Critical patent/WO2014094567A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • B01D35/027—Filters adapted for location in special places, e.g. pipe-lines, pumps, stop-cocks rigidly mounted in or on tanks or reservoirs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D36/00—Filter circuits or combinations of filters with other separating devices
    • B01D36/02—Combinations of filters of different kinds
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/20—Filtering
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C19/00—Arrangements for treating, for handling, or for facilitating the handling of, fuel or other materials which are used within the reactor, e.g. within its pressure vessel
    • G21C19/28—Arrangements for introducing fluent material into the reactor core; Arrangements for removing fluent material from the reactor core
    • G21C19/30—Arrangements for introducing fluent material into the reactor core; Arrangements for removing fluent material from the reactor core with continuous purification of circulating fluent material, e.g. by extraction of fission products deterioration or corrosion products, impurities, e.g. by cold traps
    • G21C19/307—Arrangements for introducing fluent material into the reactor core; Arrangements for removing fluent material from the reactor core with continuous purification of circulating fluent material, e.g. by extraction of fission products deterioration or corrosion products, impurities, e.g. by cold traps specially adapted for liquids
    • 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 invention relates to a nuclear power plant safety system, and in particular to a safety tank internal displacement tank filter system. Background technique
  • the safety system pump suction filter acts to filter impurities.
  • the filter in the containment system of the containment and the suction port of the containment spray system is an important equipment for the safety system of the nuclear power plant.
  • Nuclear Power Plant Safety System The pump suction filter is a mechanical device that filters impurities. It is installed at the pump suction port and is capable of filtering water with a large amount of debris and can withstand the load caused by the accumulation of debris.
  • a safety system pump is installed downstream of the filter, and the operation of the pump generates water absorption, which causes the IRWST water (or pit water) to pass through the filter. Due to the blocking of the filter, the slag stays upstream of the filter. Therefore, the water quality of the water entering the downstream of the filter meets the requirements of the system operation, avoiding excessive slag entering the downstream pipeline and the core, affecting the operation of the equipment or accumulating in the core to affect the heat removal of the core.
  • the traditional filter is directly installed in the suction port of the safety injection system or the safety chamber spray system pump.
  • the filter screen is used to filter the slag. See Figure 1 for the traditional filter and 2 for the safety injection system or the safety case spray system pump. , 3 is the reactor core.
  • a containment water tank filter system in a containment body comprising a slag trash rack disposed above a hole of an upper floor of the inner displacement water tank, below the hole of the upper floor slab
  • a slag retention basket is arranged in the replacement tank, and the upper opening height of the slag retention basket is higher than the highest liquid level of the liquid in the inner displacement tank, and the opening is aligned with the upper floor hole of the inner displacement tank.
  • the slag retention basket is independently set with the pump suction filter.
  • the slag retention basket and the pump suction filter can be connected by a fixing device; the slag trash rack, broken
  • the slag retention basket and the pump suction filter form a three-stage filtration system.
  • the slag trap grille is a wave-shaped curved structure as a whole; the bottom of the slag trash rack is provided with a strong rib.
  • the slag retention basket has an open area capable of accepting all the water flow and slag from the upstream, and is capable of accommodating the slag; a slag collection slab is disposed around the opening of the slag retention basket;
  • the surface of the stagnant basket is a stainless steel porous sieve.
  • the pump suction port filter comprises a plurality of filter modules arranged along the effective area of the displacement tank in the containment, and a base is arranged on four sides of the suction port of the safety system pump, and the filter module is fixed on the base, each The filter module comprises a combiner box disposed above the pit of the safety system pump suction port, the combiner box is connected to the bus tube channel, the filter tube assembly is provided with a filter assembly, and the filter assembly adopts a plate-like combination or a column-like combination structure on the plate or the column. A filter hole for filtering the slag is provided on the surface.
  • the filter plate of the filter assembly is adopted
  • the wavy perforated plate is used to increase the filtration area; the diameter or side length of the filter element is less than 2.1 ⁇ (or the required aperture).
  • the filter assembly of the plate-like combined structure is arranged in multiple layers; the filter assembly is disposed at the top of the manifold channel, or at the top and the upper portion of the manifold channel, or at the top and the upper sides of the manifold channel, Or the circumferential direction of the manifold channel.
  • the cross section of the manifold channel may be circular, elliptical, square, polygonal or rectangular.
  • the filtering module may adopt a combined mounting manner of a plate-like combined structure and a column-shaped combined structure filter assembly.
  • the combiner box is connected to the base of the suction port of the safety system pump by a bolt, and the combiner box is a rectangular or square box body, and the top and the side of the combiner box are frame structures, which are arranged along the diagonal direction of the frame. Strengthen the beam.
  • the beneficial effects of the invention are as follows:
  • the invention adopts three-stage filtration, and the slag trash rack can intercept large debris and prevent external impact, improve the ability of the filter to cope with accidents, and improve the safety of the system;
  • the pump suction filter has a similar or identical screen surface that intercepts and stores most of the slag, greatly reducing the amount of slag reaching the final stage of the filter and ensuring water quality within the IRWST, as it reaches the pump suction port.
  • the amount of slag is greatly reduced, so that the filtration area of the last stage filter can be reduced while maintaining a low pressure drop, and the total amount of fine particles and fibers passing through the filter is reduced, thereby reducing the possibility of downstream clogging.
  • Sex improve reactor safety; and three-stage filter, smaller footprint, more flexible layout, no need for large space, and suitable for underwater environment of internal displacement tank.
  • FIG. 1 is a schematic view showing a mounting structure of a pit filter in the prior art
  • FIG. 2 is a schematic structural view of a water tank filter system for a replacement tank in a containment of the present invention
  • FIG. 3 is a schematic structural view of a slag trap grill of the present invention.
  • Figure 4 is a schematic view showing the structure of the slag retention basket of the present invention
  • Figure 5 is a schematic view showing the structure of a filter module of the pump suction port filter of the present invention
  • FIG. 6 to FIG. 10 are schematic diagrams of a manifold path of different cross-sectional shapes of the filter of the present invention
  • FIGS. 11 to 14 are schematic views showing various connection modes of the filter assembly and the manifold channel of the present invention
  • FIG. 15 is a column structure filter assembly. Schematic diagram of the installation method of the manifold channel
  • Figure 16 is a schematic view showing the structure of a combiner box frame in which a reinforcing beam is provided. detailed description
  • the invention adopts a three-stage filter at the internal displacement water tank (IRWST) by changing the conventional single-stage filtration of the filter into a three-stage filtration, intercepting the slag under the accident condition, and finely distilling the water collected by the IRWST. Filtration to ensure that water entering the containment spray system (CSP) and safety injection system (RSI) does not cause blockage of the nozzles on the CSP system sprinkler ring and supports the fuel rod support grille during the RSI system recirculation phase Blocked.
  • CSP containment spray system
  • RSI safety injection system
  • the present invention provides a containment water tank filter system including a slag trash rack 4 disposed above a hole 7 of an upper floor of an inner displacement tank, below the hole 7 of the upper floor.
  • the inner displacement water tank is provided with a slag retention basket 5, and the upper opening height of the slag retention basket 5 is higher than the highest liquid level of the liquid in the inner displacement water tank, and the opening is aligned with the upper floor hole 7 of the inner displacement water tank;
  • the slag retention basket 5 is independently set with the pump suction port filter 6, or the slag retention basket 5 is connected with the pump suction port filter 6 by a fixing device; the slag trash rack 4, the slag retention basket 5
  • the pump suction filter 6 forms a three-stage filtration system.
  • the present invention designs the slag trash rack as a wave curved structure, as shown in FIG.
  • the ribs are added to the bottom design of the slag trap 4, and the trash rack is prevented from falling out into the inner tank.
  • the slag retention basket 5 is fixedly disposed in the inner displacement water tank, the height of the slag retention basket 5 is higher than the highest liquid level of the liquid in the inner displacement tank, and the opening of the slag retention basket 5 is aligned with the upper floor of the inner displacement tank Hole 3, as shown in Figure 2.
  • the upper floor of the inner displacement water tank has a plurality of holes 7, and a stagnant basket 5 is provided below the holes 7.
  • the structure of the slag retention basket 5 is as shown in Fig. 4.
  • the slag retention basket 5 should have an open area capable of accepting all the water flow and slag from the upstream; to prevent the slag from being left behind in the slag retention basket, If necessary, a slag collecting slab may be disposed around the opening of the slag retention basket 5; the slag retention basket 5 further includes a reinforcing rib for bearing weight, ensuring that the slag retention basket 1 has sufficient strength while storing the slag Withstand the impact of water flow.
  • the specific introduction of the slag retention basket can be referred to the applicant's patent application 201220698458. 5 "A device for intercepting and storing slag".
  • the pump suction filter comprises a plurality of filter modules arranged along the annular zone of the displacement tank in the containment, and a base is provided on four sides of the suction port of the safety system pump, and the filter module is fixed on the base.
  • Pump Suction The filter settings are modular and each filter assembly is connected by dozens of filter modules. The filter pressure drop due to upstream analysis of the amount of slag needs to ensure the net positive suction head requirements of the system pump downstream of the suction port.
  • the filter will be submerged in the internal displacement tank water for a long time, and the filter assembly can be flexibly arranged.
  • each of the filter modules 9 includes a combiner box 11 disposed above the pit of the safety system pump suction port, and the combiner tank 11 is connected to the manifold channel 12 along the two sides of the annular zone 10, and on the manifold channel 12
  • a filter assembly 13 is provided, and the filter assembly 13 is formed by a plate-like combination or a columnar combination structure, and a filter hole for filtering the slag is provided on the plate or the cylinder surface.
  • a combiner box is a box or box container that collects and holds water.
  • the surrounding or top can be a solid partition or a steel plate that acts as a mounting frame.
  • the bottom is not closed, allowing the suction of the pump to allow water to flow from the pump.
  • Outflow; the manifold channel refers to a channel or trough device that is not closed at both ends in the axial direction and is connected by flanges and connected to each other to allow the flow of the collected water to flow.
  • the cross section may be circular or rectangular. Square or oval shape. In addition to the location where the filter assembly is installed and the flange joints, the sides of the manifold are physically closed to support the frame and collect water.
  • four safety system pump suction port pits may be disposed in the containment area of the containment I RWST, and separate filter module assemblies are provided for each pit to satisfy Filtering requirements.
  • some filter module assemblies can be shared by the same series of injection injection systems to meet the filter area requirements.
  • Each of the suction port filter assemblies of the present invention is substantially submerged under water at a height of at least 10 Torr or other desired height dimension.
  • a number of manholes for maintenance and inspection are provided to the filter assembly.
  • the footprint of the entire filter assembly takes into account the space requirements of the person walking along the active area.
  • the combiner box 11 located above the pit 8 of the safety system pump suction port is a square or rectangular parallelepiped structure for facilitating a fixed connection to the floor or wall. Fixed connection to the ground and wall to ensure sealing Large debris and particles enter the suction port of the safety system pump.
  • the combiner box 11 is connected to the header channel 12 along both sides of the annular zone.
  • the combined surface of the combiner box is basically a solid steel plate, and if necessary, a vent or exhaust duct is added.
  • the manifold channel 12 is a fluid collection component that extends outwardly from the pit manifold.
  • the cross section of the manifold 12 can be a circular, elliptical, square, polygonal or rectangular shape (see Figures 6-10).
  • the basic combined surface of the manifold channel 12 is a solid steel plate. Make the necessary opening design for the location where the filter assembly 13 is to be installed.
  • the manifold channel 12 can be properly installed with filter components 1 3 except for the area connected to the ground.
  • the filter assembly 1 3 can be connected to the manifold channel 12 in a variety of similar forms such as top-loading, upper-side mounting, three-side mounting, and wraparound (see Figures 11-14).
  • Figure 1 is a top-loading type, the filter assembly 13 is disposed at the top of the manifold channel 12;
  • Figure 12 is the upper side mounting type, and the filter assembly 13 is disposed at the top and one side of the header channel 12;
  • the filter assembly 13 is disposed at the top and the upper sides of the manifold channel 12;
  • FIG. 14 is a wraparound type, and the filter assembly 13 is disposed in the circumferential direction of the manifold channel 12.
  • the filter component is a filter element mounted on the manifold channel, which may adopt a plate-like combination or a column-like combination structure, and the filter assembly of the plate-like composite structure is arranged in multiple layers, and holes are punched on the plate and on the cylinder surface for filtering. Crushed residue:
  • Plate-like composite structure The installation method of the plate-like combined filter assembly and the bus passage is shown in Figure 11 - Figure 14. These different connection methods can be applied to different processing requirements, layout requirements, filtration requirements, special side mounting, three Side-mounted or wrap-around filter assemblies are installed to ensure that water flows from the lower part of the filter assembly into the manifold path to ensure confluence.
  • the installation of the columnar composite structure filter assembly and the manifold channel is shown in Figure 15.
  • the plate-like composite filter plate may be a wavy perforated plate, such as the structure of Figure 3, to increase the filtration area and accommodate more debris.
  • connection between the confluence box 1 1 and the components of the filter assembly 1 3 is bolted to avoid thermal deformation due to the welded connection, which affects the stability and robustness of the structure.
  • the entire filter can also be assembled according to the actual installation requirements and conditions, using a combination of plate-like composite structure and column-shaped composite structure filter assembly.
  • the base is installed on the four sides of the suction port of the safety system pump.
  • the base is connected with the upper combiner box by bolts.
  • the combiner box is a rectangular or square box. Except for the bottom, the other sides can be framed and set in the diagonal direction. Reinforce the beam, see Figure 16.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Plasma & Fusion (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Structure Of Emergency Protection For Nuclear Reactors (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)

Abstract

一种安全壳内置换料水箱过滤器系统，包括设置在内置换料水箱上层楼板的孔洞（7）上方的碎渣拦污栅（4），在上层楼板的孔洞（7）下方的内置换料水箱内设置碎渣滞留篮（5），碎渣滞留篮（5）上部开口高度高于内置换料水箱中液体的最高液面，开口对准内置换料水箱的上层楼板孔洞（7）；在内置换料水箱内，碎渣滞留篮（5）与泵吸入口过滤器（6）独立设置，或者将碎渣滞留篮（5）与泵吸入口过滤器（6）采用固定装置连接；碎渣拦污栅（4）、碎渣滞留篮（5）、泵吸入口过滤器（6）形成三级过滤系统。

Description

安全壳内置换料水箱过滤器系统 技术领域
本发明涉及核电厂安全系统， 具体涉及一种安全壳内置换料水箱过滤器系 统。 背景技术
核电厂安全壳内发生 L0CA或主蒸汽管道断裂等事故时， 安全壳内高能管线 破裂， 破口介质的喷放力将对周围的保温材料、 土建结构及设备的涂漆以及其 他物质等形成冲击破坏， 从而导致大量各类碎渣的产生， 如果碎渣传递至安全 注入喷淋、 安全喷淋系统入口处的水池（例如二代加压水堆机组中的地坑 , 三 代压水堆机组中内置换料水箱 IRWST )并沉积在其内部设置的过滤器上， 滤网上 的碎渣累积将会引起碎渣层压降的增加， 进而有可能导致安全注入系统或安全 壳喷淋系统及泵产生流量不足、 汽蚀等问题， 影响核电厂安全。
在事故工况下， 安全壳喷淋系统、 安全注入系统要投入使用， 利用 IRWST 水（或地坑汇集的水）进行堆芯注入和安全壳喷淋， 为了保证喷淋水质， 有必 要进行 IRWST 内 （或地坑汇集的水）碎渣的过滤。 安全系统泵吸入口过滤器即 起到过滤杂质的作用。 安全壳内安注系统和安全壳喷淋系统泵吸入口处的过滤 器， 是核电厂安全系统的重要设备。 核电站安全系统泵吸入口过滤器是一种过 滤杂质的机械类设备， 它安装于泵吸入口处， 能够过滤带有大量碎渣的水， 并 能承受碎渣积聚而带来的负荷。 它的工作原理是， 过滤器下游安装有安全系统 泵， 泵的运行产生吸水的作用， 导致 IRWST水（或地坑水）通过过滤器， 由于 过滤器的阻挡， 碎渣滞留在过滤器上游， 从而使进入过滤器下游的水的水质满 足系统运行要求， 避免过量碎渣进入下游管道和堆芯， 影响设备的运行或者堆 积在堆芯内影响堆芯余热导出。
传统过滤器直接安装在安全注入系统或安全壳喷淋系统泵吸入口， 采用滤 网过滤碎渣， 见图 1 , 图中 1为传统过滤器， 2为安全注入系统或安全壳喷淋系 统泵， 3为反应堆堆芯。
为了防止产生流量不足、 汽蚀等问题， 传统过滤器需要具有较大的过滤面 积， 保证过滤器整体压降在限值内。 因此传统过滤器的布置需要占据相当大空 间， 以二代压水堆核电厂为例， 地坑过滤器布置占据了一半的环廊面积。 同时 由于流通面积过大， 还导致通过滤网的微粒和纤维较多， 可能影响反应堆堆芯 的热量导出。 发明内容
针对现有技术中所存在的不足， 本发明的目的是提供一种占地面积小、 布 置更为灵活， 且过滤效率高的安全壳内置换料水箱过滤器系统。 本发明所采用的技术方案如下： 一种安全壳内置换料水箱过滤器系统， 包 括设置在内置换料水箱上层楼板的孔洞上方的碎渣拦污栅， 在所述上层楼板的 孔洞下方的内置换料水箱内设置碎渣滞留篮， 碎渣滞留篮上部开口高度高于内 置换料水箱中液体的最高液面， 开口对准内置换料水箱的上层楼板孔洞。 在内 置换料水箱内， 碎渣滞留篮与泵吸入口过滤器独立设置， 如果受空间限值， 可 以将碎渣滞留篮与泵吸入口过滤器采用固定装置连接； 碎渣拦污栅、 碎渣滞留 篮、 泵吸入口过滤器形成三级过滤系统。 进一步， 所述的碎渣拦污栅整体为波浪式曲面结构； 碎渣拦污栅的底部设 置力口强筋。 进一步， 所述碎渣滞留篮具有能够接受来自上游的所有水流及碎渣的开口 面积， 并能容纳碎渣； 所述碎渣滞留篮的开口处周围设置碎渣收集围板； 所述 碎渣滞留篮的表面为不锈钢制多孔滤网。 进一步， 所述的泵吸入口过滤器包括若干个沿安全壳内置换料水箱有效区 布置的过滤模块， 在安全系统泵吸入口的四边设置基座， 所述过滤模块固定在 基座上， 每个过滤模块包括设置在安全系统泵吸入口地坑上方的汇流箱， 汇流 箱连接汇流筒道， 汇流筒道上设有过滤组件， 过滤组件采用板片状组合或柱状 组合结构， 在板片上或柱面上设有用于过滤碎渣的过滤孔。
更进一步， 当所述过滤组件为板片状组合结构时， 过滤组件的过滤板采用 波浪状打孔板， 以增加过滤面积； 过滤组件的过滤孔直径或边长小于 2. 1匪 （或 要求的孔径）。
更进一步， 所述板片状组合结构的过滤组件为多层设置； 过滤组件设置在 汇流筒道的顶部， 或汇流筒道的顶部及一侧上部， 或汇流筒道的顶部及两侧上 部， 或汇流筒道的周向。
更进一步， 所述的汇流筒道横截面可以为圆形、 椭圆形、 正方形、 多边形 或长方形。 进一步， 所述的过滤模块可以采用板片状组合结构和柱状组合结构过滤组 件的组合式安装方式。 进一步， 所述的汇流箱通过螺栓与安全系统泵吸入口的基座相连接， 所述 汇流箱为长方形或正方形箱体， 汇流箱的顶部及侧面为框架结构， 沿框架的对 角线方向设置加强梁。 本发明的有益效果如下： 本发明采用三级过滤， 碎渣拦污栅可以拦截大碎 渣， 防止外来冲击， 提高了过滤器应对事故的能力， 提高系统的安全性； 碎渣 滞留篮采用与泵吸入口过滤器类似或相同的滤网表面， 可以拦截并储存大部分 碎渣， 从而极大减少到达最后一级过滤器碎渣量， 并且可以保证 IRWST 内的水 质， 由于到达泵吸入口过滤器的碎渣量大大减少， 从而可以在减少最后一级过 滤器的过滤面积的同时仍然保持较低的压降， 而且通过过滤器的微小颗粒和纤 维的总量减少， 降低下游发生堵塞的可能性， 提高反应堆安全性； 而且三级过 滤器， 占地面积较小， 布置更为灵活， 不需要大面积空间， 同时适用于内置换 料水箱这种水下环境。
附图说明
图 1为现有技术中地坑过滤器的安装结构示意图；
图 2为本发明的安全壳内置换料水箱过滤器系统结构示意图；
图 3为本发明的碎渣拦污栅结构示意图；
图 4为本发明的碎渣滞留篮结构示意图； 图 5为本发明的泵吸入口过滤器的一个过滤模块结构示意图；
图 6至图 10为本发明的过滤器不同横截面形状的汇流筒道示意图； 图 11至图 14 为本发明的过滤组件与汇流筒道的多种连接方式示意图； 图 15为柱状结构过滤组件与汇流筒道的安装方式示意图；
图 16为设置加强梁的汇流箱框架结构示意图。 具体实施方式
下面结合附图和具体实施例对本发明作详细说明。
本发明通过将传统的过滤器单级过滤改为三级过滤， 在内置换料水箱 (IRWST)处设置了三级过滤器， 在事故工况下拦截碎渣， 对 IRWST收集到的水进 行精细过滤， 以确保进入安全壳喷淋系统 （CSP )及安全注入系统（RSI ) 的水 不会引起 CSP系统喷淋环管上的喷嘴的堵塞以及在 RSI 系统再循环阶段对燃料 棒支撑隔栅的堵塞。
如图 2 所示， 本发明提供的安全壳内置换料水箱过滤器系统， 包括设置在 内置换料水箱上层楼板的孔洞 7上方的碎渣拦污栅 4 , 在所述上层楼板的孔洞 7 下方的内置换料水箱内设置碎渣滞留篮 5 ,碎渣滞留篮 5上部开口高度高于内置 换料水箱中液体的最高液面， 开口对准内置换料水箱的上层楼板孔洞 7 ; 在内置 换料水箱内，碎渣滞留篮 5与泵吸入口过滤器 6独立设置， 或者将碎渣滞留篮 5 与泵吸入口过滤器 6采用固定装置连接； 碎渣拦污栅 4、 碎渣滞留篮 5、 泵吸入 口过滤器 6形成三级过滤系统。
为了增大碎渣拦污栅 4 的拦截面积， 本发明将碎渣拦污栅设计为波浪式曲 面结构， 如图 3所示。 为了增大碎渣拦污栅的结构强度， 在碎渣拦污栅 4的底 部设计中增加加强筋， 同时可防止拦污栅脱落至内置换料水箱中。 碎渣拦污栅 的具体介绍可以参照申请人同期申请的专利 201220700048. X《内置换料水箱的 大碎渣拦污栅》。
碎渣滞留篮 5 固定设置在内置换料水箱内， 碎渣滞留篮 5的高度高于内置 换料水箱中液体的最高液面， 碎渣滞留篮 5 的开口对准内置换料水箱的上层楼 板孔洞 3 , 如图 2所示。 内置换料水箱的上层楼板具有若干孔洞 7 , 在孔洞 7的 下方设置滞留篮 5。碎渣滞留篮 5的结构如图 4所示，碎渣滞留篮 5应具有能够 接受来自上游的所有水流及碎渣的开口面积； 为防止碎渣遗漏在碎渣滞留篮外， 必要时可以在碎渣滞留篮 5的开口处周围设置碎渣收集围板； 碎渣滞留篮 5还 包括起承重作用的加强筋， 保证碎渣滞留篮 1 具有足够的强度在贮存碎渣的同 时承受水流的冲击。 碎渣滞留篮的具体介绍可以参照申请人同期申请的专利 201220698458. 5 《一种用于拦截并贮存碎渣的装置》。
泵吸入口过滤器包括若干个沿安全壳内置换料水箱环形区布置的过滤模 块， 在安全系统泵吸入口的四边设置基座， 过滤模块固定在基座上。 泵吸入口 过滤器设置使用模块化设计， 每个过滤器组件由数十组过滤模块连接而成。 根 据上游分析碎渣量导致的过滤器压降需确保吸入口下游系统泵的净正吸入压头 要求。 过滤器将长期淹没于内置换料水箱水中， 过滤器组件可灵活布置。
如图 5所示， 所述每个过滤模块 9 包括设置在安全系统泵吸入口地坑上方 的汇流箱 11 , 汇流箱 11沿环形区 10的两侧连接汇流筒道 12 , 汇流筒道 12上 设有过滤组件 1 3 , 过滤组件 1 3采用板片状组合或柱状组合结构， 在板片上或柱 面上设有用于过滤碎渣的过滤孔。
汇流箱是指一种汇集并容纳水流的箱式或盒式容器， 四周或顶部可以是实 体隔板， 也可以是起安装框架作用的钢板， 下方不封闭， 从而允许靠泵的吸力 使水流从下方流出； 汇流筒道是指一种沿轴向方向两端面不封闭， 并通过法兰 连接并前后相连的允许汇集水流流动的渠式或槽式装置， 其横截面可以是圆形、 长方形、 正方形或椭圆形等形状。 除安装过滤组件的部位和法兰连接处外， 汇 流筒道四周是实体封闭的， 起支撑框架和汇集水流的作用。
在一个实施例中， 为了适应 IRWST内部空间布置限制， 可以在安全壳 I RWST 环形区内设置 4 个安全系统泵吸入口地坑， 针对每个地坑， 设置独立的过滤器 模块组件， 来满足过滤的要求。
为了避免过滤面积过大而受到布置空间及占地面积的限制， 可通过同一系 列的安注安喷系统共用某些过滤模块组件， 以满足过滤面积的要求。
本发明所述的每个吸入口过滤器组件整体淹没于水下至少 1 0匪高度或其他 要求的高度尺寸。
根据布置覆盖范围， 对过滤器组件设置了若干便于进行维修及检查的人孔。 整个过滤器组件的占地空间要考虑人员沿有效区域行走的空间需求。
位于安全系统泵吸入口地坑 8上方的汇流箱 11是正方体或长方体结构， 便 于进行与地面或墙面的固定连接。 与地面和墙面的固定连接要保证密封， 避免 大的碎渣及颗粒进入安全系统泵吸入口。 汇流箱 11沿环形区两侧连接汇流筒道 12。 汇流箱的组合面基本为实体钢板， 必要时加排气孔或排气导管。
汇流筒道 12为从地坑汇流箱向外延伸的流体汇集部件。 汇流筒道 12横截 面可以为圆形、 椭圆形、 正方形、 多边形或长方形等适用形状（见图 6-图 10 )。 汇流筒道 12的基本组合面为实体钢板。 对于需要安装过滤组件 1 3的位置进行 必要的开孔设计。 汇流筒道 12除与地面连接的区域外， 均可以适当安装过滤组 件 1 3。 过滤组件 1 3与汇流筒道 12的连接方式可以为上装式、 上侧装式、 三侧 装式、 环绕式等多种类似形式（见图 11-图 14 )。 图 1 1为上装式， 过滤组件 1 3 设置在汇流筒道 12的顶部； 图 12为上侧装式， 过滤组件 1 3设置在汇流筒道 12 的顶部及一侧上部； 图 1 3为三侧装式， 过滤组件 1 3设置在汇流筒道 12的顶部 及两侧上部； 图 14为环绕式， 过滤组件 1 3设置在汇流筒道 12的周向。
过滤组件是安装于汇流筒道上的过滤元件， 其可以采用板片状组合或柱状 组合结构， 板片状组合结构的过滤组件为多层设置， 在板片上和柱面上要打孔 用于过滤碎渣：
板片状组合结构： 板片状组合过滤组件与汇流通道的安装方式见图 11-图 14,这些不同的连接方式可适用于不同的加工要求、 布置要求、 过滤要求， 特别 两侧装、 三侧装或环绕式这类的过滤组件安装方式， 可以确保水流从过滤组件 较低的位置进入汇流筒道， 确保汇流水量。
柱状组合结构： 柱状组合结构过滤组件与汇流筒道的安装方式见图 15。 板片状组合过滤板可以采用波浪状打孔板， 例如类似图 3 的结构， 用以增 加过滤面积， 并容纳更多的碎渣。
汇流筒道 12、 汇流箱 1 1与过滤组件 1 3的各零部件之间的连接采用螺栓连 接形式， 避免因为焊接连接而产生热变形， 影响结构的稳定性和坚固性。
整个过滤器还可以根据实际安装需求和条件限制， 采用板片状组合结构和 柱状组合结构过滤组件的组合式安装设计。
位于安全系统泵吸入口四边安装基座， 基座与上方的汇流箱采用螺栓连接， 汇流箱为长方形或正方形箱体， 除底部外， 其他面都可以采用框架结构， 并在 对角线方向设置加强梁， 见图 16。
泵吸入口过滤器的具体介绍可以参照申请人同期申请的专利 20121 0549550. X《核电站内置换料水箱内安全系统泵吸入口过滤器》。 需要注意的是， 上述具体实施例仅仅是示例性的， 在本发明的上述教导下， 本领域技术人员可以在上述实施例的基础上进行各种改进和变形， 而这些改进 或者变形均落在本发明的保护范围内。 本领域技术人员应该明白， 上面的具体 描述只是为了解释本发明的目的， 并非用于限制本发明。 本发明的保护范围由 权利要求及其等同物限定。

Claims

权 利 要 求
1.一种安全壳内置换料水箱过滤器系统， 其特征在于： 包括设置在内置换 料水箱上层楼板的孔洞（ 7 )上方的碎渣拦污栅（ 4 ),在所述上层楼板的孔洞（ 7 ) 下方的内置换料水箱内设置碎渣滞留篮（5 ), 碎渣滞留篮（5 )上部开口高度高 于内置换料水箱中液体的最高液面， 开口对准内置换料水箱的上层楼板孔洞
( 7 ), 内置换料水箱楼板上的孔洞数量根据工程实际情况确定； 在内置换料水 箱内， 碎渣滞留篮 （5 ) 与泵吸入口过滤器（6 )独立设置， 或者将碎渣滞留篮
( 5 ) 与泵吸入口过滤器（ 6 )采用固定装置连接； 碎渣拦污栅（ 4 )、 碎渣滞留 篮（5 )、 泵吸入口过滤器（6 )形成三级过滤系统。
2. 如权利要求 1所述的安全壳内置换料水箱过滤器系统， 其特征在于： 所 述的碎渣拦污栅（4 )整体为波浪式曲面结构。
3. 如权利要求 2所述的安全壳内置换料水箱过滤器系统， 其特征在于： 所 述的碎渣拦污栅（4 ) 的底部设置加强筋。
4. 如权利要求 1所述的安全壳内置换料水箱过滤器系统， 其特征在于： 所 述碎渣滞留篮（ 5 )具有能够接受来自上游的所有水流及碎渣的开口面积， 并容 纳碎渣。
5. 如权利要求 4所述的安全壳内置换料水箱过滤器系统， 其特征在于： 所 述碎渣滞留篮（5 ) 的开口处周围设置碎渣收集围板。
6. 如权利要求 4或 5所述的安全壳内置换料水箱过滤器系统，其特征在于： 所述碎渣滞留篮（5 ) 的表面为不锈钢制多孔滤网。
7. 如权利要求 1所述的安全壳内置换料水箱过滤器系统， 其特征在于： 所 述的泵吸入口过滤器（6 ) 包括若干个沿安全壳内置换料水箱可用区域（10 )布 置的过滤模块（ 9 ), 在安全系统泵吸入口的上方（吸入口垂直方向）或侧边（吸 入口水平方向）设置基座， 所述过滤模块固定在基座上， 每个过滤模块包括设 置在安全系统泵吸入口地坑（8 )上方的汇流箱 （11 ), 汇流箱 （11 )连接汇流 筒道（ 12 ), 汇流筒道（ 12 ) 上连接有过滤组件 （ 13 ), 过滤组件（ 13 )采用板 片状组合或柱状组合结构， 在板片上或柱面上设有用于过滤碎渣的过滤孔。
8. 如权利要求 7所述的安全壳内置换料水箱过滤器系统， 其特征在于： 当 所述过滤组件（13) 为板片状组合结构时， 过滤组件（13) 的过滤板采用波浪 状打孔板， 以增加过滤面积。
9. 如权利要求 8所述的安全壳内置换料水箱过滤器系统， 其特征在于： 所 述板片状组合结构的过滤组件为多层平行或连续设置。
10. 如权利要求 7或 8或 9所述的安全壳内置换料水箱过滤器系统， 其特 征在于： 所述的过滤组件（ 13 )设置在汇流筒道（ 12 )的顶部， 或汇流筒道（ 12 ) 的顶部及一侧上部， 或汇流筒道（12 ) 的顶部及两侧上部， 或汇流筒道（12 ) 的周向。
11. 如权利要求 7 所述的安全壳内置换料水箱过滤器系统， 其特征在于： 所述的汇流筒道（12)横截面可以为圆形、 椭圆形、 正方形、 多边形或长方形。
12. 如权利要求 7 所述的安全壳内置换料水箱过滤器系统， 其特征在于： 所述的过滤模块采用板片状组合结构和柱状组合结构过滤组件的组合式安装方 式。
13. 如权利要求 7 所述的安全壳内置换料水箱过滤器系统， 其特征在于： 所述的汇流箱 （ 11 )通过螺栓与安全系统泵吸入口的基座相连接， 所述汇流箱 为长方形或正方形箱体， 汇流箱的顶部及侧面为框架结构， 沿框架的对角线方 向设置加强梁。
14. 如权利要求 7或 8所述的安全壳内置换料水箱过滤器系统， 其特征在 于： 过滤组件（13) 的过滤孔直径或边长小于 2.1
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