Pit filter

Abstract

The utility model relates to a pit filter and belongs to the technical field of pit filters. Comprising a first circulating pump inlet, a second circulating pump inlet and a plurality of filter bodies, the filter bodies are arranged on the two sides of the first circulating pump inlet and the two sides of the second circulating pump inlet respectively, and the filter bodies are sequentially arranged along an arc line; the plurality of filter bodies are divided into two groups, the water outlet ends of the first group of filter bodies are communicated with a first confluence channel, the water outlet ends of the second group of filter bodies are communicated with a second confluence channel, and the first confluence channel is respectively communicated with the first circulating pump inlet and the second circulating pump inlet; and the first confluence channel is respectively communicated with the first circulating pump inlet and the second circulating pump inlet. According to the utility model, the problem of unreasonable layout or small filtering area in the prior art is solved.

Description

Technical Field

[0001] The utility model relates to a pit filter and belongs to the technical field of pit filters. Background Art

[0002] The pit at the bottom of the reactor containment of a pressurized water reactor nuclear power plant is used to collect coolant from the primary circuit in case of major leakage. After a baseline accident such as a loss of coolant accident (LOCA) or a main steam line rupture accident (MSLB) occurs in a pressurized water reactor nuclear power plant, the coolant enters the containment pit through the rupture. The coolant will be filtered through the containment pit filter and then enter the safety injection system (RIS) and the containment spray system (EAS) through a pump device for reactor cooling to avoid serious damage to the core and overpressure in the containment.

[0003] Therefore, the containment pit filter is an important equipment of the safety system of the pressurized water reactor nuclear power plant. Its working condition under the recirculation condition directly affects the normal operation of the safety injection system and the containment spray system. After the accident, the coolant entering the containment pit is mixed with a large amount of insulation materials and other material fragments. These fragments must be filtered through the pit filter to ensure that the safety injection system and the containment spray system perform their safety functions.

[0004] At present, the power plants in operation in China basically use the original design of pit filters, which are composed of large debris racks (EAS004FD) and four filters (EAS005 / 006FI and RIS005 / 006FI). The four filters are located at the water inlets of EAS and RIS pumps, respectively, and are contained by EAS004FI in a cubic structure. The filtration area is only the side area of ​​the cube, which is very limited.

[0005] Due to the limited space in the nuclear power plant, it is necessary to reasonably arrange the filters in the limited space and minimize the impact of the arranged filters on other pipes and equipment in the plant. The traditional method of arranging a rectangular filter directly above the pit cannot meet the requirements of the filtration area, and the simple combination of new filter modules cannot adapt to the actual situation in the plant.

[0006] Therefore, a new solution needs to be proposed to solve this problem. Utility Model Content

[0007] The technical problem to be solved by the utility model is to provide a pit filter, which solves the problems of unreasonable layout or small filtering area in the prior art.

[0008] The technical problem to be solved by the utility model is achieved by adopting the following technical solutions:

[0009] A pit filter comprises a first circulation pump inlet, a second circulation pump inlet and a plurality of filter bodies, wherein the plurality of filter bodies are respectively arranged on both sides of the first circulation pump inlet and the second circulation pump inlet, and the plurality of filter bodies are sequentially arranged along an arc line;

[0010] Several filter bodies are divided into two groups. The water outlet ends of the first group of filter bodies are connected to a first confluence channel, and the water outlet ends of the second group of filter bodies are connected to a second confluence channel. The first confluence channel is respectively connected to the first circulation pump inlet and the second circulation pump inlet, and the second confluence channel is respectively connected to the first circulation pump inlet and the second circulation pump inlet.

[0011] The utility model is further configured as follows: the plurality of filter bodies are divided into a first filter module and a second filter module;

[0012] The first filter module includes a first confluence housing installed in the pit, a plurality of filter cartridge units installed on one side of the first confluence housing, and a first confluence pipe installed on the top of the other side of the first confluence housing;

[0013] The second filter module includes a second confluence shell installed in the pit, a plurality of filter cartridge units installed on one side of the second confluence shell, and a second confluence pipe installed on the bottom of the other side of the second confluence shell.

[0014] The utility model is further configured as follows: the first group of filter bodies is provided with 8-12 filter bodies and includes 3-5 first filter modules and 5-7 second filter modules, the second filter modules in the first group of filter bodies are all arranged on one side of the first circulation pump inlet and the second circulation pump inlet, and the first filter modules in the first group of filter bodies are all arranged on the other side of the first circulation pump inlet and the second circulation pump inlet;

[0015] The second group of filter bodies is provided with 8-12 filter bodies and all of them are second filter modules, and the second filter modules in the second group of filter bodies are all arranged on the other side of the first circulation pump inlet and the second circulation pump inlet;

[0016] The first circulation pump inlet is provided with a first confluence interface and a second confluence interface, the second circulation pump inlet is provided with a third confluence interface and a fourth confluence interface, the first confluence tube and the second confluence tube in the first group of filter bodies cooperate with the first confluence interface and the second confluence interface to form a first confluence channel, and the second confluence tube in the second group of filter bodies cooperate with the second confluence interface and the fourth confluence interface to form a second confluence channel.

[0017] The utility model is further configured as follows: the first group of filter bodies includes 4 first filter modules and 6 second filter modules, and the second group of filter bodies includes 10 second filter modules.

[0018] The utility model is further configured as follows: the arc distance between two adjacent filter bodies located on one side of the first circulation pump inlet and the second circulation pump inlet is 5°-6°, and the arc distance between two adjacent filter bodies located on the other side of the first circulation pump inlet and the second circulation pump inlet is 5°-6°.

[0019] The utility model is further configured as follows: the spacing arc between two adjacent filter bodies located on one side of the first circulation pump inlet and the second circulation pump inlet is 5.5°, and the spacing arc between two adjacent filter bodies located on the other side of the first circulation pump inlet and the second circulation pump inlet is 5.5°.

[0020] The beneficial effects of the utility model are:

[0021] 1. By arranging a plurality of filter bodies in an arc shape and dividing them into two groups, and connecting the two groups of filter bodies to the first circulation pump inlet and the second circulation pump inlet through the first confluence channel and the second confluence channel respectively, the two groups of filter bodies constitute one backup and one use, are independent of each other and do not affect each other, and meet the single failure criterion;

[0022] 2. The filter body is divided into two modular structures, which are installed in a modular manner to facilitate later maintenance and meet interchangeability requirements;

[0023] 3. Set 5-7 filter bodies on one side of the first circulating pump inlet and the second circulating pump inlet, and set 13-15 filter bodies on the other side of the first circulating pump inlet and the second circulating pump inlet, so as to make reasonable use of the corridor space and make the space layout more compact;

[0024] 4. By setting the filter body as a new type of cartridge filter, the filtration area is increased to meet higher blockage rate requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0026] Figure 2 yes Figure 1 A partial enlarged view of part A.

[0027] Figure 3 It is a structural schematic diagram of the first filtering module part in the utility model.

[0028] Figure 4 It is a structural schematic diagram of the second filtering module part in the utility model.

[0029] In the figure: 1. first circulation pump inlet; 2. second circulation pump inlet; 3. filter body; 4. first confluence channel; 5. second confluence channel; 6. first filter module; 7. second filter module; 8. first confluence shell; 9. filter cartridge unit; 10. first confluence pipe; 11. second confluence shell; 12. second confluence pipe; 13. first confluence interface; 14. second confluence interface; 15. third confluence interface; 16. fourth confluence interface. DETAILED DESCRIPTION

[0030] In order to make the technical means, creative features, objectives and effects of the present invention easier to understand, the present invention is further described below in conjunction with specific illustrations.

[0031] like Figure 1-Figure 4 As shown, a pit filter includes a first circulation pump inlet 1, a second circulation pump inlet 2 and a plurality of filter bodies 3, wherein the plurality of filter bodies 3 are respectively arranged on both sides of the first circulation pump inlet 1 and the second circulation pump inlet 2, and the plurality of filter bodies 3 are arranged in sequence along an arc line, and the arc distance between two adjacent filter bodies 3 located on one side of the first circulation pump inlet 1 and the second circulation pump inlet 2 (that is, the distance between the center lines of the filter bodies 3 in the radial direction of the arc line) is 5°-6°, preferably 5.5°, and the arc distance between two adjacent filter bodies 3 located on the other side of the first circulation pump inlet 1 and the second circulation pump inlet 2 is 5°-6°, preferably 5.5°.

[0032] Several filter bodies 3 are divided into two groups. The water outlet ends of the first group of filter bodies 3 are connected to a first confluence channel 4, and the water outlet ends of the second group of filter bodies 3 are connected to a second confluence channel 5. The first confluence channel 4 is respectively connected to the first circulation pump inlet 1 and the second circulation pump inlet 2, and the second confluence channel 5 is respectively connected to the first circulation pump inlet 1 and the second circulation pump inlet 2.

[0033] In order to enable the filter body 3 to be installed in a modular manner, the filter bodies 3 are divided into a first filter module 6 and a second filter module 7, and the filter body 3 is divided into two modular structures. Through modular installation, it is convenient for later maintenance and meets the interchangeability requirements. Among them:

[0034] The first filter module 6 includes a first confluence housing 8 installed in the pit, a plurality of filter cartridge units 9 installed on one side of the first confluence housing 8, and a first confluence pipe 10 installed on the top of the other side of the first confluence housing 8; the second filter module 7 includes a second confluence housing 11 installed in the pit, a plurality of filter cartridge units 9 installed on one side of the second confluence housing 11, and a second confluence pipe 12 installed on the bottom of the other side of the second confluence housing 11. By setting the filter body 3 as a new type of filter cartridge, the filtration area is increased to meet higher blockage rate requirements.

[0035] The first circulation pump inlet 1 and the second circulation pump inlet 2 are both provided with a cover plate, the cover plate on the first circulation pump inlet 1 is fixedly installed with a first confluence interface 13 and a second confluence interface 14, the cover plate on the second circulation pump inlet 2 is fixedly installed with a third confluence interface 15 and a fourth confluence interface 16, the first confluence tube 10 and the second confluence tube 12 in the first group of filter bodies 3 cooperate with the first confluence interface 13 and the second confluence interface 14 to form a first confluence channel 4, the second confluence tube 12 in the second group of filter bodies 3 cooperate with the second confluence interface 14 and the fourth confluence interface 16 to form a second confluence channel 5.

[0036] The first group of filter bodies 3 is provided with 8-12 filter bodies 3, preferably 10, and includes 3-5 first filter modules 6 and 5-7 second filter modules 7, preferably 4 first filter modules 6 and 6 second filter modules 7, the second filter modules 7 in the first group of filter bodies 3 are all arranged on one side of the first circulation pump inlet 1 and the second circulation pump inlet 2, and the first filter modules 6 in the first group of filter bodies 3 are all arranged on the other side of the first circulation pump inlet 1 and the second circulation pump inlet 2;

[0037] The second group of filter bodies 3 is provided with 8-12 filter bodies 3 and all of them are second filter modules 7 , preferably 10. The second filter modules 7 in the second group of filter bodies 3 are all arranged on the other side of the first circulation pump inlet 1 and the second circulation pump inlet 2 .

[0038] The implementation principle of the utility model is:

[0039] By arranging a number of filter bodies 3 in an arc shape and dividing them into two groups, and the two groups of filter bodies 3 are respectively connected to the first circulation pump inlet 1 and the second circulation pump inlet 2 through the first confluence channel 4 and the second confluence channel 5, the two groups of filter bodies 3 constitute one backup and one use, are independent of each other, do not affect each other, and meet the single failure criterion.

[0040] The above shows and describes the basic principles, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited to the above embodiments. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of protection claimed by the utility model. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A pit filter, characterized in that: The invention comprises a first circulation pump inlet (1), a second circulation pump inlet (2) and a plurality of filter bodies (3), wherein the plurality of filter bodies (3) are respectively arranged on both sides of the first circulation pump inlet (1) and the second circulation pump inlet (2), and the plurality of filter bodies (3) are arranged in sequence along an arc line; A plurality of filter bodies (3) are divided into two groups, the water outlet ends of the filter bodies (3) of the first group are connected to a first confluence channel (4), and the water outlet ends of the filter bodies (3) of the second group are connected to a second confluence channel (5), the first confluence channel (4) is respectively connected to the first circulation pump inlet (1) and the second circulation pump inlet (2), and the second confluence channel (5) is respectively connected to the first circulation pump inlet (1) and the second circulation pump inlet (2).

2. A pit filter according to claim 1, characterized in that: The plurality of filter bodies (3) are divided into a first filter module (6) and a second filter module (7); The first filter module (6) comprises a first flow converging shell (8) installed in the pit, a plurality of filter cartridge units (9) installed on one side of the first flow converging shell (8), and a first flow converging pipe (10) installed on the top of the other side of the first flow converging shell (8); The second filter module (7) comprises a second flow confluence shell (11) installed in the pit, a plurality of filter cartridge units (9) installed on one side of the second flow confluence shell (11), and a second flow confluence pipe (12) installed on the bottom of the other side of the second flow confluence shell (11).

3. A pit filter according to claim 2, characterized in that: The first group of filter bodies (3) is provided with 8-12 filter bodies (3) and includes 3-5 first filter modules (6) and 5-7 second filter modules (7), the second filter modules (7) in the first group of filter bodies (3) are all arranged on one side of the first circulation pump inlet (1) and the second circulation pump inlet (2), and the first filter modules (6) in the first group of filter bodies (3) are all arranged on the other side of the first circulation pump inlet (1) and the second circulation pump inlet (2); The second group of filter bodies (3) is provided with 8-12 filter bodies (3) and all of them are second filter modules (7), and the second filter modules (7) in the second group of filter bodies (3) are all arranged on the other side of the first circulation pump inlet (1) and the second circulation pump inlet (2); The first circulation pump inlet (1) is provided with a first confluence interface (13) and a second confluence interface (14), the second circulation pump inlet (2) is provided with a third confluence interface (15) and a fourth confluence interface (16), the first confluence pipe (10) and the second confluence pipe (12) in the first group of filter bodies (3) cooperate with the first confluence interface (13) and the second confluence interface (14) to form a first confluence channel (4), and the second confluence pipe (12) in the second group of filter bodies (3) cooperate with the second confluence interface (14) and the fourth confluence interface (16) to form a second confluence channel (5).

4. A pit filter according to claim 1, characterized in that: The first group of filter bodies (3) includes four first filter modules (6) and six second filter modules (7), and the second group of filter bodies (3) includes ten second filter modules (7).

5. A pit filter according to claim 1, characterized in that: The arc distance between two adjacent filter bodies (3) located on one side of the first circulation pump inlet (1) and the second circulation pump inlet (2) is 5°-6°, and the arc distance between two adjacent filter bodies (3) located on the other side of the first circulation pump inlet (1) and the second circulation pump inlet (2) is 5°-6°.

6. A pit filter according to claim 5, characterized in that: The arc distance between two adjacent filter bodies (3) located on one side of the first circulation pump inlet (1) and the second circulation pump inlet (2) is 5.5°, and the arc distance between two adjacent filter bodies (3) located on the other side of the first circulation pump inlet (1) and the second circulation pump inlet (2) is 5.5°.

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