CN108295533B - Pre-filtering device and pre-filtering method for inlet water of nuclear power station pump station - Google Patents

Abstract

The invention discloses a pre-filtering device for inlet water of a nuclear power station pump station, which comprises a rack, a filter screen plate combined structure arranged on the rack, a lifting slide rail mechanism for lifting the rack up and down relative to an inlet water channel and a fixed locking mechanism for selectively locking or releasing the lifting position of the rack, wherein the fixed locking mechanism is arranged on the lifting slide rail mechanism or the rack, and the rack adjusts the depth of the filter screen plate combined structure in flowing liquid in the lifting process so as to enhance the intercepting and filtering capacity of the inlet water channel of the nuclear power station pump station, reduce the downstream operation load and the maintenance cost and improve the reliability and the safety of a cold source system of the nuclear power station pump station. In addition, the invention also discloses a pre-filtering method applying the pre-filtering device for the pump station inlet water of the nuclear power station.

Description

Pre-filtering device and pre-filtering method for inlet water of nuclear power station pump station

Technical Field

The invention relates to the field of filtration of a water inlet flow passage of a nuclear power station pump station, in particular to a water inlet pre-filtering device and a pre-filtering method of the nuclear power station pump station.

Background

With the progress of science and technology and the development of humanity, nuclear power plants are mature more and play a great role. The nuclear power station pump station provides a water source for a downstream cooling related system, so that seawater entering from the upstream of a water inlet flow channel of the nuclear power station pump station needs to be filtered and can be conveyed to the downstream for use.

At present, nuclear power stations under construction and in operation in China are located on the coast, and each nuclear power station depends on seawater as a heat sink to cool equipment of a nuclear island and a conventional island. Seawater intake of the nuclear power station from a water intake port to a pump station is mainly to filter and clean seawater through three barriers. The first barrier is an interception net in front of a water intake; the second channel is a coarse grating and a fine grating (comprising a trash remover); the third pass is a rotating drum screen. The meshes of the three barriers are sequentially decreased progressively to realize the progressive filtration of the seawater. Wherein, the larger the clearance of the filtering device, the more the functional position of the equipment is back, wherein the clearance of the grid bars of the thick grating is 200mm, which is mainly used for intercepting larger foreign matters; the gap between the grid bars of the fine grid is 50mm, and the fine grid is mainly used for intercepting foreign matters and larger marine organisms; the meshes of the drum-shaped filter screen are 3mm, and the drum-shaped filter screen is mainly used for terminal filtration and finally meets the requirement of a cold source system of a power station on the quality of cooling water.

At the present stage, the three barriers of seawater filtration and sewage disposal at the water intake of the nuclear power plant cannot effectively deal with the massive invasion of marine organisms. According to data statistics of the nuclear power operation research Institute (INPO), water intake blockage events of global nuclear power plants reach 61 times from 2004 to 2008, and most of the events are caused by aquatic organisms. Nearly 80% of events cause unit derating or shutdown, and more than 20% of events directly affect safety-related systems of the nuclear power plant.

Since 2013, in the water intake sea area of domestic power stations, events that influence engineering water intake due to jellyfish, spherical phaeocystis red tide, silt, small fishes and shrimps and the like occur successively, so that the pressure difference of a drum filter screen, an SEC system shellfish catcher filter screen and a plate heat exchanger is abnormally increased, even partial CRF pumps of the unit are automatically tripped due to high pressure difference of the drum filter screen, and then events such as load reduction operation and even shutdown of the unit are caused, so that the maintenance cost is greatly increased.

Therefore, it is urgently needed to add a pre-filtering device for inlet water of a nuclear power station pumping station before three barriers so as to reduce the operation load of a drum filter screen at a terminal and improve the operation reliability of the drum filter screen.

Disclosure of Invention

The invention aims to provide a nuclear power station pump station inlet water prefilter which can reduce the operation load of a drum filter screen at a terminal and improve the operation reliability.

It is another object of the present invention to provide a prefiltering method that reduces the operational load on the end drum filter.

In order to achieve the purpose, the pre-filtering device for the water inlet of the nuclear power station pump station is suitable for pre-filtering flowing liquid in a water inlet flow channel and comprises a rack, a filter screen plate combined structure arranged on the rack, a lifting slide rail mechanism for enabling the rack to lift up and down relative to the water inlet flow channel, a fixed locking mechanism for selectively locking or releasing the lifting position of the rack and a movable water baffle plate for selectively lifting up and down relative to the water inlet flow channel. The fixed locking mechanism is arranged on the lifting slide rail mechanism or the rack, and the rack drives the filter screen plate combined structure to lift so as to adjust the height of the filter screen plate combined structure in the water inlet flow passage; the length direction of the movable water baffle is the same as that of the rack, and the movable water baffle is used for selectively lifting relative to the water inlet flow channel to open or close a gap between the bottom of the filter screen plate combined structure and the bottom of the water inlet flow channel in the vertical direction.

Preferably, the length direction of the frame is the same as the length direction of the filter screen plate combined structure.

Preferably, the lifting slide rail mechanism is mounted on the side wall of the machine frame in the length direction.

Preferably, the lifting slide rail mechanism comprises a slide rail groove and a roller assembly sliding up and down along the slide rail groove, the slide rail groove is pre-buried in a civil engineering structure, and the roller assembly is mounted on the frame.

Preferably, the roller assembly includes a roller supporting member and a roller mounted on the roller supporting member, the roller supporting member is fixed to the frame, the roller is located in the slide rail groove and slides along the slide rail groove, and the fixing and locking mechanism is arranged along the length direction of the frame and selectively penetrates through the roller supporting member and the slide rail groove.

Preferably, the rollers include a first roller and a second roller, the first roller is in rolling contact with the groove wall of the slide rail groove arranged along the width direction of the rack, and the second roller is in rolling contact with the groove wall of the slide rail groove arranged along the length direction of the rack.

Preferably, the filter screen plate combined structure is replaceably mounted on the frame.

Preferably, the rack at least comprises two rack sections along the vertical direction, and the two adjacent rack sections are spliced into a whole through a segmented connecting mechanism.

Preferably, the segment connecting mechanism comprises a lower support frame connected to the outer side of one of the two adjacent rack segments and an upper support frame connected to the outer side of the other of the two adjacent rack segments, and the upper support frame is detachably connected with the lower support frame.

Preferably, the lower supporting frame is provided with a first vertical plate parallel to the side wall of the rack section and a first horizontal plate vertically connected with the first vertical plate; the upper supporting frame is provided with a second vertical plate parallel to the side wall of the rack section and a second horizontal plate vertically connected with the second vertical plate, the first horizontal plate and the second horizontal plate are mutually stacked, and a first bolt vertically penetrates through the first horizontal plate and the second horizontal plate to lock the first horizontal plate and the second horizontal plate together.

Preferably, the lower supporting frame is further provided with a connecting vertical plate which is parallel to the second vertical plate and penetrates through the second horizontal plate, and a second bolt horizontally penetrates through the upper supporting frame and the connecting vertical plate to lock the second vertical plate and the connecting vertical plate together.

Preferably, a reinforced vertical plate is further arranged between the first horizontal plate and the first vertical plate, a vertical plate hole is formed in the center of the reinforced vertical plate, and the center line of the vertical plate hole is arranged along the length direction of the rack.

Preferably, the filter screen plate combined structure is a hollow annular structure closed end to end.

Preferably, the pre-filtering device for the pump station inlet water of the nuclear power station further comprises a chain plate for driving the filter screen plate combined structure to do lifting rotary motion and a power assembly for providing power for the chain plate, wherein the chain plate comprises a plurality of chain plate units which jointly enclose a closed loop structure, the chain plate units are hinged end to enable the chain plate to do lifting rotary motion, the chain plate units are provided with openings communicated with a space enclosed by the closed loop structure, the filter screen plate combined structure comprises a rotating screen plate, and the rotating screen plate is rotatably arranged on the chain plate units; in the process of the periodic lifting and rotating motion of the chain plate, the rotating screen plate rotates relative to the chain plate to periodically open and close the opening while the rotating screen plate performs the periodic lifting and rotating motion along with the chain plate.

Preferably, the rotating mesh plate automatically rotates to a position for closing the opening by the gravity of the rotating mesh plate in the process of the chain plate driving to ascend; the rotating screen plate automatically rotates to the position for opening the opening by the gravity of the rotating screen plate in the process of driving the chain plate to descend.

Preferably, the filter screen plate assembly structure further comprises a first frame, the first frame is mounted on the chain plate unit, the rotary screen plate has a mounting end located in front and used for pivoting along a lifting and rotating direction of the chain plate and a free end located behind the mounting end, and the mounting end is pivoted with the first frame.

Preferably, the filter screen plate combined structure further comprises a bucket-shaped screen plate and a second frame, the bucket-shaped screen plate is mounted on the second frame, and the second frame is mounted on a chain plate unit without the rotating screen plate.

Preferably, the bucket-shaped mesh plates and the rotating mesh plates are sequentially and alternately arranged along the lifting and rotating direction of the chain plate.

In order to achieve the above object, the pre-filtering method of the present invention comprises the steps of:

(1) judging the marine organism pollution concentration in the flowing liquid in the water inlet flow channel; and

(2) adjusting the lifting position of the frame relative to the water inlet flow channel according to the judgment result, so as to adjust the ratio lambda of the filtering section of the filter screen plate combined structure, wherein the lambda is X/(H + H); wherein X is a gap value between the bottom of the filter screen plate combined structure and the bottom of the water inlet flow channel, H is a water level value after filtering by the filter screen plate combined structure, and H is a water level loss value of the filter screen plate combined structure.

Preferably, the range of the filter section ratio lambda is more than or equal to 50% and less than or equal to 95%.

Compared with the prior art, the inlet water pre-filtering device for the nuclear power station pump station is additionally arranged on the inlet water flow passage of the original pump station, the intercepting and filtering capacity of the inlet water flow passage of the nuclear power station pump station is enhanced, the risk of overload stalling caused by the running load of a downstream drum-shaped filter screen can be reduced, the maintenance cost is effectively reduced, and the reliability and the safety of a cold source system of the nuclear power station pump station are improved. Meanwhile, the inlet water prefilter of the nuclear power station pump station comprises a rack, a filter screen plate combined structure arranged on the rack, a lifting slide rail mechanism for the rack to lift up and down relative to the inlet water channel and a fixed locking mechanism for selectively locking or releasing the lifting position of the rack, so that when a large amount of marine life invades, the inlet water prefilter of the nuclear power station pump station is quickly arranged in the inlet water channel by the lifting slide rail mechanism, thereby achieving the purpose of quick intervention and use and saving the reaction time for coping with the invasion of the marine life; and the frame adjusts the depth of the filter screen plate combined structure in the flowing liquid in the up-and-down lifting process, and the maximum filtering capacity is exerted on the premise of ensuring the safety of the inlet water pre-filtering device of the nuclear power station pump station.

Drawings

FIG. 1 is a schematic side view of a nuclear power plant pumping station influent prefilter of the present invention.

Fig. 2 is a schematic plan view of fig. 1 viewed from a direction.

Fig. 3 is an enlarged schematic view at B in fig. 2.

Fig. 4 is an enlarged schematic view at C in fig. 1.

Fig. 5 is a schematic plan view seen from the direction D in fig. 4.

FIG. 6 is a schematic structural diagram of a filter screen plate combination structure in the inlet water prefilter of the nuclear power station of the present invention.

Fig. 7 is a schematic plan view seen from the direction E in fig. 6.

FIG. 8 is a flow chart of a pre-filtering method of the present invention.

Detailed Description

In order to explain technical contents and structural features of the present invention in detail, the following description is made with reference to the embodiments and the accompanying drawings.

Referring to fig. 1 to 2, the inlet water prefilter for a nuclear power station pump station of the present invention is suitable for prefiltering flowing liquid in an inlet channel 200, and includes a frame 1, a filter screen plate assembly 2 mounted on the frame 1, a lifting slide rail mechanism 3 for lifting the frame 1 up and down relative to the inlet channel 200, a fixing and locking mechanism 4 for selectively locking or releasing a lifting position of the frame 1, a movable water baffle 5 for selectively lifting up and down relative to the inlet channel 200, a link plate 7 for driving the filter screen plate assembly 2 to perform lifting and rotating motions, and a power assembly (not labeled in the drawings) for providing power to the link plate. The fixed locking mechanism 4 is disposed on the lifting slide rail mechanism 3, and of course, the fixed locking mechanism 4 may be disposed on the frame 1, but is not limited thereto. The frame 1 adjusts the depth P of the filter screen plate combined structure 2 in the flowing liquid in the up-down lifting process; for example, as shown in fig. 1, in the present embodiment, when the frame 1 descends relative to the water inlet channel 200, the filter screen plate assembly 2 is continuously moved into the flowing liquid in the water inlet channel 200, so that the depth P of the filter screen plate assembly 2 in the flowing liquid is gradually increased, and the requirement of pre-filtering the flowing liquid with high marine biological pollution concentration is better met; when the frame 1 rises relative to the water inlet channel 200, the filter screen plate combination structure 2 moves in the direction of moving away from the flowing liquid, so that the depth P of the filter screen plate combination structure 2 in the flowing liquid gradually becomes smaller, and the requirement of pre-filtering the flowing liquid with small marine organism pollution concentration is better met, so that the reaction time is fast, and the pre-filtering mode can be flexibly adjusted, but the invention is not limited thereto. Specifically, in this embodiment, the length directions of the frame 1 and the filter screen plate composite structure 2 (indicated by the double-headed arrow in the filter screen plate composite structure 2 in fig. 2) are the same, so that the frame 1 and the filter screen plate composite structure 2 are transversely disposed in the water inlet channel 200 to better intercept and filter marine organisms in the flowing liquid in a transverse direction; meanwhile, the lifting slide rail mechanism 3 is used for being installed between the civil engineering structure 210 of the water inlet channel 200 and the machine frame 1, but not limited thereto. More specifically, the following:

as shown in fig. 1 and 2, the filter screen plate assembly structure 2 is replaceably mounted on the frame 1, so that the inlet water prefilter of the nuclear power station pump station of the present invention can adapt to marine biofiltration of different sizes. Specifically, in this embodiment, the filter screen plate assembly structure 2 is a hollow annular structure with a closed head and a closed tail, so that the filter screen plate assembly structure 2 rotates to scoop up marine organisms and is cleaned by the flushing device, and accordingly, the filter screen plate assembly structure 2 can be made into a plurality of modular units, and the modular units are connected with each other to form an annular structure, so that a new modular unit can be replaced when a certain modular unit is damaged, thereby improving the durability of the filter screen plate assembly structure 2 and further improving the overall service life of the inlet water prefilter of the nuclear power station pump station.

Referring to fig. 6 and 7, the link plate 7 includes a plurality of link plate units 71 enclosing a closed loop structure together, the plurality of link plate units 71 are hinged end to make the link plate 7 perform a lifting and lowering rotary motion, and the link plate units 71 have openings 72 communicating with a space 73 enclosed by the closed loop structure.

Referring to fig. 6 and 7, the filter screen assembly 2 includes a rotary screen 21, a first frame 22, a bucket-shaped screen 23, and a second frame 24. Rotatory otter board 21 is located link joint unit 21 on the ground of rotating, and the realization mode has: the rotary screen plate 21 is pivoted with the first frame 22 fixed on the chain plate unit 71; alternatively, the rotary screen 21 is fixed to the first frame 22 and is pivoted to the link plate unit 71 by the first frame 22. During the periodic elevating and revolving movement of the link plate 71, the rotating mesh plate 21 follows the periodic elevating and revolving movement of the link plate 7, and the rotating mesh plate 21 rotates relative to the link plate unit 71 to periodically open and close the opening 72. For example, in the present embodiment, the rotating mesh plate 21 automatically rotates to the position for closing the opening 72 by the gravity of the rotating mesh plate 21 during the lifting process driven by the link plate 7; the rotating mesh plate 21 is automatically rotated to a position for opening the opening 72 by the gravity of the rotating mesh plate 21 during the descent of the link plate 7, as shown in fig. 6. Therefore, the opening 72 is closed when the rotary screen plate 21 ascends, and the opening 72 is opened when the rotary screen plate 21 descends, so when the rotary screen plate 21 is applied to the inlet water prefilter of the nuclear power station pump station, the collected dirt between the rotary screen plate 21 at the ascending side and the rotary screen plate 21 at the descending side can smoothly flow away from the opening 72 of the chain plate unit 71 at the descending side along with water flow, the risk of load stop of the inlet water prefilter of the nuclear power station pump station is reduced, the maintenance cost is reduced, and the operation reliability is improved. More specifically, in the present embodiment, the rotating mesh plate 21 has a mounting end 211 located at the front and pivotally connected to the first frame 22 and a free end 212 located at the rear of the mounting end along the lifting and rotating direction of the link plate 7, the mounting end 211 is pivotally connected to the first frame 22, and the free end 212 periodically opens and closes the opening 72 around the pivotal connection between the mounting end 211 and the first frame 22.

Meanwhile, the bucket net plate 23 is mounted on the second frame 24, and the second frame 24 is mounted on the link plate unit 71 without the rotating net plate 21. That is, the first frame 22 and the second frame 24 are not disposed on the same link plate unit 71; therefore, by the bucket-shaped screen plate 23, the dirt is fished up by the bucket-shaped screen plate 23 in the process of lifting and rotating and is washed away by the washing device, and the filtering effect and the filtering capacity are improved. Specifically, in the present embodiment, the bucket-shaped mesh plates 23 and the rotating mesh plates 21 are alternately arranged in sequence along the lifting and revolving direction of the chain plates 7, so that the sum of the number of the bucket-shaped mesh plates 23 and the number of the rotating mesh plates 21 is equal to the number of the chain plate units 71; because the bucket-shaped net plates 23 and the rotary net plates 21 are sequentially and alternately arranged, correspondingly, the first frames 22 and the second frames 24 are also sequentially and alternately arranged; therefore, the bucket-shaped screen 23 and the rotating screen 21 are used in cooperation, so that the filter screen assembly 2 can intercept and filter more dirt while realizing internal cleaning, and moreover, the bucket-shaped screen 23 can collect the dirt discharged from the opening 72 of the chain plate unit 71 at the descending side outside the closed loop structure again, so that the bucket-shaped screen 23 can be carried above the closed loop structure to realize final cleaning when ascending. For example, when the rotating mesh plate 21 and the bucket-shaped mesh plate 23 are located at the ascending side, the rotating mesh plate 21 closes the opening 72, the bucket-shaped mesh plate 23 and the rotating mesh plate 21 intercept and filter the dirt, and the intercepted dirt is carried to the top of the closed-loop structure by the bucket-shaped mesh plate 23 to be cleaned conveniently; when the rotating screen plate 21 and the bucket-shaped screen plate 23 are positioned on the descending side, the rotating screen plate 21 opens the opening 72 of the chain plate unit 71 on the descending side, the dirt is discharged from the opening 72 of the chain plate unit 71 on the descending side along the liquid flowing direction, and the bucket-shaped screen plate 23 collects part of the discharged dirt again to the outer side of the closed loop structure and is cleaned when the dirt is circulated to the uppermost part of the closed loop structure next time. Of course, in other embodiments, the bucket-shaped net plate 23 can be replaced by the rotating net plate 21 according to the actual requirement, but is not limited thereto. Preferably, when the bucket-shaped mesh plate 23 is not provided, each link plate unit 71 at this time corresponds to one rotating mesh plate 21, that is, one rotating mesh plate 21 periodically opens and closes the opening 22 of one link plate unit 71.

Preferably, the mesh diameter of the rotary screen plate 21 and the bucket-shaped screen plate 23 is in the range of 3mm to 15mm, but not limited thereto. When the volume particles of the marine organisms in the water inlet runner 200 are large, the rotary screen plate 21 and the bucket-shaped screen plate 23 with large meshes are selected; when the volume particles of the marine life in the water inlet flow channel are small, the rotary screen plate 21 and the bucket-shaped screen plate 23 with small meshes are selected, and a user can select the rotary screen plate 21 and the bucket-shaped screen plate 23 with proper meshes according to actual needs, so the mesh diameters of the rotary screen plate 21 and the bucket-shaped screen plate 23 are not limited to the above.

As shown in fig. 2 and fig. 3, in the present embodiment, a lifting slide rail mechanism 3 is installed on a side wall of the frame 1 in the length direction (i.e. the direction indicated by the double arrow in the filter screen plate assembly structure 2 in fig. 2), and the lifting slide rail mechanism 3 is further located between the side wall of the frame 1 in the length direction and the civil engineering structure 210; preferably, the lifting slide rail mechanisms 3 are arranged on the left and right sides in the length direction of the frame 1, but not limited thereto. Specifically, the lifting slide rail mechanism 3 includes a slide rail groove 31 and a roller assembly sliding up and down along the inside of the slide rail groove 31, the slide rail groove 31 is pre-embedded in the civil engineering structure 210, and the roller assembly is installed on the frame 1. Therefore, the frame 1 is matched with the slide rail groove 31 by the roller components, so that the pre-filtering device for the nuclear power station pump station can be quickly installed on the water inlet flow passage 200, the reaction time of intervention treatment when marine organisms invade is prolonged, the frame 1 can lift up and down more smoothly, a guiding effect is provided for the up-and-down movement of the frame 1, the frame 1 is prevented from shaking in the up-and-down sliding process, and the working stability and reliability of the pre-filtering device for the nuclear power station pump station water inlet are maintained. More specifically, the roller assembly includes a roller supporting member 321 and a roller 322 mounted on the roller supporting member 321, the roller supporting member 321 is fixed to the frame 1, the roller 322 is located in the slide rail groove 31 and slides along the slide rail groove 31, the fixing and locking mechanism 4 is disposed along the length direction of the frame 1 and selectively penetrates the roller supporting member 321 and the slide rail groove 31, so that an operator can lock the position of the frame 1 by penetrating the fixing and locking mechanism 4 into the roller supporting member 321 and the slide rail groove 31 or pull out the fixing and locking mechanism 4 from the roller supporting member 321 to allow the frame 1 to be adjusted up and down relative to the water inlet channel 200 according to actual needs, and thus the operation is more flexible. For example, in the present embodiment, the roller 322 includes a first roller 322a and a second roller 322b, the first roller 322a is in rolling contact with a groove wall of the slide rail groove 31 arranged along the width direction of the rack 1 (i.e. the direction indicated by the arrow in the water inlet channel 200 in fig. 1 and the opposite direction), and the second roller 322b is in rolling contact with a groove wall of the slide rail groove 31 arranged along the length direction of the rack 1, so that the rack 1 is effectively prevented from moving along the horizontal direction in the up-and-down lifting process by the cooperation of the first roller 322a and the second roller 322b, thereby ensuring the smoothness and stability of the up-and-down lifting of the rack 1, but not limited thereto.

As shown in fig. 2, in the present embodiment, the length directions of the movable splash guard 5 and the frame 1 are the same, so that the movable splash guard 5 is horizontally disposed in the water inlet channel 220; the water guard plate 5 is moved to be selectively raised and lowered with respect to the water inlet channel 200 to open or close a gap X in an up-and-down direction between the bottom of the filter screen plate assembly 2 and the bottom of the water inlet channel 200. For example, when the pollution concentration of marine organisms in the water inlet channel 200 is low, the filter screen plate combined structure 2 rises, and the water baffle 5 is moved to block a gap between the bottom of the filter screen plate combined structure 2 and the bottom of the water inlet channel 200, so that sewage enters a downstream position after being filtered by the filter screen plate combined structure 2, and the sewage is filtered thoroughly in the load range of the filter screen plate combined structure 2; when the pollution concentration of marine organisms in the water inlet channel 200 is high, the filter screen plate combined structure 2 descends to the middle of the water inlet channel 200, the movable water baffle 5 slides upwards to allow a part of sewage to directly pass through the gap X, and therefore the operation load of the filter screen plate combined structure 2 is ensured in addition to the filtering part of sewage.

Referring to fig. 1, 4 and 5, the frame 1 at least includes two frame sections 11 along the vertical direction, and the two adjacent frame sections 11 are spliced into a whole through the segmented connecting mechanism, and the frame 1 is made into a segmented structure, so that the inlet water prefilter for the nuclear power station pumping station occupies a smaller space when being lifted, and segmented transportation, storage and lifting are realized. Specifically, the segment connecting mechanism comprises a lower support frame connected to the outer side of one of the two adjacent rack sections 11 and an upper support frame connected to the outer side of the other of the two adjacent rack sections 11, and the upper support frame and the lower support frame are detachably connected to simplify the structure of the segment connecting mechanism. More specifically, the lower support frame is provided with a first vertical plate 611 parallel to the side wall of the frame section 11 and a first horizontal plate 612 vertically connected to the first vertical plate 611; meanwhile, the upper support frame is provided with a second vertical plate 621 parallel to the side wall of the rack section 11 and a second horizontal plate 622 vertically connected with the second vertical plate 621, the first horizontal plate 612 and the second horizontal plate 622 are mutually stacked, and a first bolt 63 vertically penetrates through the first horizontal plate 612 and the second horizontal plate 622 to lock the first horizontal plate 612 and the second horizontal plate 622 together, so that the assembly and disassembly are facilitated; preferably, the lower supporting frame is further provided with a connecting vertical plate 613 parallel to the second vertical plate 611 and penetrating the second horizontal plate 622, and a second bolt 64 horizontally penetrates the upper supporting frame and the connecting vertical plate 613 to lock the second vertical plate 621 and the connecting vertical plate 613 together, so that the connecting vertical plate 613 and the second vertical plate 621 are used for locking, and a locking is added between the upper and lower supporting frames 61 and 62, so that the locking between the upper and lower supporting frames 62 and 62 is more fastened. Meanwhile, a reinforced vertical plate 614 is further arranged between the first horizontal plate 612 and the first vertical plate 611, a vertical plate hole 6141 is formed in the center of the reinforced vertical plate 614, and the center line of the vertical plate hole 6141 is arranged along the length direction of the rack 1, so that the first horizontal plate 612 is prevented from being broken due to over-concentrated stress of the first horizontal plate 612 by the reinforced vertical plate 614, and the lifting device can penetrate through all the vertical plate holes 6141 to conveniently lift the rack 1 by the lifting device.

Referring to fig. 8, the pre-filtering method 200 of the present invention includes the following steps:

and S001, judging the marine organism pollution concentration in the flowing liquid in the water inlet flow channel 200.

S002, adjusting the lifting position of the frame 1 relative to the water inlet runner 200 according to the judgment result, and adjusting the ratio lambda of the filtering section of the filter screen plate combined structure 2, wherein the lambda is X/(H + H); as shown in fig. 1, X is a gap value between the bottom of the filter screen plate composite structure 2 and the bottom of the water inlet channel 200, H is a water level value after filtering by the filter screen plate composite structure 2, and H is a water level loss value of the filter screen plate composite structure 2; preferably, the range of the ratio lambda of the filtering section is more than or equal to 50% and less than or equal to 95%, so as to ensure the working reliability of the inlet water prefilter for the nuclear power station pump station. Specifically, in this embodiment, the adjustment process of the filter section ratio λ is: when the concentration of the dirt of the marine organisms in the flowing liquid in the water inlet runner 200 is high, the filtering section ratio lambda is adjusted to be lower; when the concentration of marine organism contaminants in the flowing liquid in the influent channel 200 is low, the higher filtration cross-sectional ratio λ is adjusted, and the concentration ratio of marine organisms in the flowing liquid in the influent channel 200 is measured by the maximum filtration capacity of the downstream drum filter. For example, in the present embodiment, the method for adjusting the filtering section ratio λ is as follows: when the pollution concentration of marine organisms in the water inlet runner 200 is low, the filter screen plate combined structure 2 rises to improve the ratio lambda value of the filter section; when the pollution concentration of the marine organisms in the water inlet channel 200 is high, the filter screen plate combination structure 2 is lowered to reduce the filter section ratio lambda value.

The working principle of the inlet water prefilter of the nuclear power station pump station is explained with reference to the attached drawings: the frame 1 can be quickly installed in the water inlet runner 200 by the slide rail groove 31 pre-buried in the civil engineering structure 210 and the roller components installed on the frame 1; when the pollution concentration of marine organisms in the flowing liquid in the water inlet runner 200 is low, the fixed locking mechanism 4 is operated at the moment, so that the fixed locking mechanism 4 allows the rack 1 to be adjusted to be lifted relative to the water inlet runner 200, the rack 1 is lifted, and the position of the rack 1 lifted relative to the water inlet runner 200 is locked by the fixed locking mechanism 4 after the rack is lifted to the position; when the marine organism pollution concentration in the flowing liquid in the water inlet flow channel 200 is high, the fixing and locking mechanism 4 is operated at the moment, the fixing and locking mechanism 4 allows the rack 1 to be adjusted in a lifting mode relative to the water inlet flow channel 200, so that the rack 1 descends, and after the rack descends to the proper position, the fixing and locking mechanism 4 locks the descending position of the rack 1 relative to the water inlet flow channel 200 so as to match the pre-filtration of different marine organism concentrations.

Compared with the prior art, the inlet water prefilter of the nuclear power station pump station is additionally arranged on the inlet water flow passage 200 of the original pump station, the intercepting and filtering capacity of the inlet water flow passage 200 of the nuclear power station pump station is enhanced, the risk of overload stalling caused by the running load of a downstream drum-shaped filter screen can be reduced, the maintenance cost is effectively reduced, and the reliability and the safety of a cold source system of the nuclear power station pump station are improved. Meanwhile, the inlet water prefilter of the nuclear power station pump station comprises a rack 1, a filter screen plate combined structure 2 arranged on the rack 1, a lifting slide rail mechanism 3 which is arranged between a civil engineering structure 210 of the inlet water channel 200 and the rack 1 and is used for lifting the rack 1 up and down relative to the inlet water channel 200, and a fixed locking mechanism 4 used for selectively locking or releasing the lifting position of the rack 1, so that when a large amount of marine organisms invade, the inlet water prefilter of the nuclear power station pump station is quickly arranged in the inlet water channel 200 by the lifting slide rail mechanism 3, the purpose of quick intervention and use is achieved, and the reaction time for coping with the invasion of the marine organisms is saved; and the frame 1 adjusts the depth P of the filter screen plate combined structure 2 in the flowing liquid in the up-and-down lifting process, thereby playing the maximum filtering capacity on the premise of ensuring the safety of the inlet water prefilter of the nuclear power station pump station.

It is noted that the values of H and H are standard parameters of the filter screen assembly 2, which are well known in the art and therefore will not be described in detail herein. Meanwhile, the length direction of the frame 1 and the length direction of the filter screen plate combined structure 2 are the same as the transverse direction of the water inlet runner 200, and the width direction of the frame 1 is the same as the longitudinal direction of the water inlet runner 200; the structure of the power assembly for driving the link plate 7 to perform the lifting and lowering rotary motion is well known in the art, and therefore, will not be described in detail herein; it is understood that, when the filter screen plate assembly 2 does not need to perform the lifting and lowering rotation, the chain plate 7 and the power assembly can be eliminated, and the above example is not limited thereto.

The above disclosure is only a preferred embodiment of the present invention, and should not be taken as limiting the scope of the invention, so that the appended claims are intended to cover all such modifications and changes as fall within the true spirit of the invention.

Claims (20)

1. The utility model provides a nuclear power station pump station advances water prefilter, is suitable for the interior mobile liquid prefilter of inlet channel, its characterized in that: the water inlet flow passage lifting device comprises a rack, a filter screen plate combined structure arranged on the rack, a lifting slide rail mechanism for enabling the rack to lift up and down relative to the water inlet flow passage, a fixed locking mechanism for selectively locking or releasing the lifting position of the rack, and a movable water baffle plate for selectively lifting up and down relative to the water inlet flow passage, wherein the fixed locking mechanism is arranged on the lifting slide rail mechanism or the rack, and the rack drives the filter screen plate combined structure to lift up and down so as to adjust the height of the filter screen plate combined structure in the water inlet flow passage; the length direction of the movable water baffle is the same as that of the rack, and the movable water baffle is used for selectively lifting relative to the water inlet flow channel to open or close a gap between the bottom of the filter screen plate combined structure and the bottom of the water inlet flow channel in the vertical direction.

2. The nuclear power plant pump station inlet water prefilter of claim 1, wherein the length direction of the rack is the same as the length direction of the filter screen plate combined structure.

3. The nuclear power plant pump station inlet water prefilter of claim 1, wherein the lifting slide rail mechanism is mounted on a side wall of the frame in a length direction.

4. The nuclear power station pump station inlet water prefilter device according to claim 1, wherein the lifting slide rail mechanism comprises a slide rail groove and a roller assembly which slides up and down along the inside of the slide rail groove, the slide rail groove is pre-buried in a civil structure, and the roller assembly is mounted on the frame.

5. The nuclear power plant pump station influent water prefilter according to claim 4, wherein the roller assembly comprises a roller support member and a roller mounted on the roller support member, the roller support member is fixed to the frame, the roller is located in the slide rail groove and slides along the slide rail groove, and the fixing and locking mechanism is arranged along the length direction of the frame and selectively penetrates through the roller support member and the slide rail groove.

6. The nuclear power plant pump station influent water prefilter according to claim 5, wherein the rollers comprise a first roller and a second roller, the first roller is in rolling contact with the groove wall of the slide rail groove arranged along the width direction of the rack, and the second roller is in rolling contact with the groove wall of the slide rail groove arranged along the length direction of the rack.

7. The nuclear power plant pump station influent prefilter apparatus of claim 1 wherein said screen panel assembly is replaceably mounted to said frame.

8. The nuclear power plant pumping station inlet water prefilter of claim 1, wherein the frame comprises at least two frame sections in the vertical direction, and two adjacent frame sections are spliced into a whole through a segmented connecting mechanism.

9. The nuclear power plant pumping station influent prefilter according to claim 8 wherein said segmented connecting mechanism comprises a lower support frame connected to the outside of one of two adjacent said frame sections and an upper support frame connected to the outside of the other of two adjacent said frame sections, said upper support frame being detachably connected to said lower support frame.

10. The nuclear power plant pump station inlet water prefilter of claim 9 wherein the lower support frame is provided with a first vertical plate parallel to the side wall of the rack section and a first horizontal plate vertically connected to the first vertical plate; the upper supporting frame is provided with a second vertical plate parallel to the side wall of the rack section and a second horizontal plate vertically connected with the second vertical plate, the first horizontal plate and the second horizontal plate are mutually stacked, and a first bolt vertically penetrates through the first horizontal plate and the second horizontal plate to lock the first horizontal plate and the second horizontal plate together.

11. The nuclear power plant pump station inlet water prefilter of claim 10, wherein the lower support frame is further provided with a connecting vertical plate parallel to the second vertical plate and penetrating the second horizontal plate, and a second bolt horizontally penetrates the upper support frame and the connecting vertical plate to lock the second vertical plate and the connecting vertical plate together.

12. The nuclear power station pump station inlet water prefilter of claim 10, wherein a reinforced vertical plate is further arranged between the first horizontal plate and the first vertical plate, a vertical plate hole is arranged in the center of the reinforced vertical plate, and the center line of the vertical plate hole is arranged along the length direction of the rack.

13. The nuclear power plant pump station inlet water prefilter of claim 1 wherein the filter screen panel composite structure is a hollow annular structure closed end to end.

14. The nuclear power station pump station inlet water prefilter according to claim 1, further comprising a chain plate for driving the filter screen plate composite structure to perform lifting and rotating motions and a power assembly for providing power to the chain plate, wherein the chain plate comprises a plurality of chain plate units which jointly enclose a closed loop structure, the chain plate units are hinged end to enable the chain plate to perform lifting and rotating motions, the chain plate units are provided with openings communicated with a space enclosed by the closed loop structure, the filter screen plate composite structure comprises a rotating screen plate, and the rotating screen plate is rotatably arranged on the chain plate units; in the process of the periodic lifting and rotating motion of the chain plate, the rotating screen plate rotates relative to the chain plate to periodically open and close the opening while the rotating screen plate performs the periodic lifting and rotating motion along with the chain plate.

15. The nuclear power plant pump station inlet water prefilter device according to claim 14, wherein said rotating screen plate automatically rotates to a position closing said opening by the gravity of said rotating screen plate during the ascent driven by said link plate; the rotating screen plate automatically rotates to the position for opening the opening by the gravity of the rotating screen plate in the process of driving the chain plate to descend.

16. The nuclear power plant pump station inlet water prefilter device of claim 15, wherein the filter screen plate combined structure further comprises a first frame, the first frame is mounted on the chain plate unit, the rotary screen plate has a mounting end for pin joint located in front and a free end located behind the mounting end along the lifting and rotating direction of the chain plate, and the mounting end is pin-jointed with the first frame.

17. The nuclear power plant pump station inlet water prefilter device of claim 14, wherein the filter screen plate combined structure further comprises a bucket-shaped screen plate and a second frame, the bucket-shaped screen plate is mounted on the second frame, and the second frame is mounted on a chain plate unit without the rotating screen plate.

18. The nuclear power plant pump station inlet water prefilter of claim 17, wherein the hopper-shaped screen plates are arranged alternately with the rotating screen plates in sequence along the lifting and rotating direction of the chain plates.

19. A pre-filtering method using the device for pre-filtering the pump station inlet water of the nuclear power plant according to any one of claims 1 to 18, which is characterized by comprising the following steps:

(1) judging the marine organism pollution concentration in the flowing liquid in the water inlet flow channel; and

(2) adjusting the lifting position of the frame relative to the water inlet flow channel according to the judgment result, so as to adjust the ratio lambda of the filtering section of the filter screen plate combined structure, wherein the lambda is X/(H + H); wherein X is a gap value between the bottom of the filter screen plate combined structure and the bottom of the water inlet flow channel, H is a water level value after filtering by the filter screen plate combined structure, and H is a water level loss value of the filter screen plate combined structure.

20. The prefiltration process of claim 19 wherein said filter cross-sectional ratio λ is in the range of 50% to 95%.

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