A pulse backwash filter device suitable for radioactive liquid

Abstract

The present invention belongs to the technical field of spent fuel reprocessing, and specifically relates to a pulse backwash filtration device suitable for radioactive liquid, comprising a radioactive liquid feed section provided with a radioactive liquid storage tank (1) and a backwash water feed section provided with a backwash water storage tank (2), the radioactive liquid feed section and the backwash water feed section being respectively connected to a flocculation tank (3), the radioactive liquid feed section being able to filter the radioactive liquid sent from the flocculation tank (3) through the radioactive liquid storage tank (1) and then send it out, and the backwash water feed section being able to backwash the radioactive liquid storage tank (1) through the backwash water in the backwash water storage tank (2). The entire set of equipment of the present invention has no mechanical moving parts, is not easily damaged, has high reliability, is convenient to clean and maintain, and is suitable for installation in a radioactive hot cell.

Description

Technical Field

[0001] The invention belongs to the technical field of spent fuel post-processing, and in particular relates to a pulse backwash filtering device suitable for radioactive liquid. Background Art

[0002] In the spent fuel reprocessing process, the spent fuel solution undergoes acidity and valence adjustment before being clarified. This process aims to separate solid impurities and some radioactive fission products from the solution, thereby obtaining a cleaner solvent extract. While centrifugation offers high processing capacity and clarification efficiency, the equipment contains rotating parts, making maintenance difficult. Media filtration, while simpler, is challenging to clean under radioactive conditions. Liquid clarification is a high priority for reprocessing plants worldwide. This is because the effectiveness of liquid clarification and the level of harmful impurities in the solution significantly impact the stable operation of the extractor and the effectiveness of the solvent extraction cycle purification. Consequently, many countries are researching the use of higher-performance filters. Many reprocessing plants use sintered stainless steel with filter media having a pore size of approximately 20μm. To improve filtration efficiency, there is a desire to utilize filter media with smaller pore sizes, such as 5μm, 3μm, or even 1μm. This improved filtration efficiency can enhance extraction purification and maintain stable production operations.

[0003] With the development of nuclear power, the content of fission products in power reactor fuel elements has become increasingly higher as they are burned up, and the amount of insoluble residues has also increased. Most of them are fine particles of precious metal elements. Therefore, the filter is required to not only improve the filtration efficiency, but also to achieve effective backflushing and slag removal. Summary of the Invention

[0004] The filtration and clarification of spent fuel solution is crucial to the stable operation of reprocessing plants. However, current research on filtration of radioactive liquids in China is insufficient, and a pulse backwash filtration process for spent fuel solution has not yet been mastered. The present invention aims to provide a device capable of conducting radioactive liquid filtration experiments and backwashing experiments under radioactive conditions, as well as studies on filter cake thickness and specific resistance at different filter pore sizes.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is a pulse backwash filtration device suitable for radioactive liquid, which includes a radioactive liquid feed section provided with a radioactive liquid storage tank and a backwash water feed section provided with a backwash water storage tank. The radioactive liquid feed section and the backwash water feed section are respectively connected to a flocculation tank. The radioactive liquid feed section can filter the radioactive liquid sent from the flocculation tank through the radioactive liquid storage tank and then send it out. The backwash water feed section can backwash the radioactive liquid storage tank through the backwash water in the backwash water storage tank.

[0006] further,

[0007] The radioactive liquid feeding section includes a first pipeline, a second pipeline, a third pipeline, a fourth pipeline, and a fifth pipeline; the radioactive liquid storage tank is capable of filtering the radioactive liquid;

[0008] The top end of the second pipeline is connected to the bottom end of the radioactive liquid storage tank, and the tail end is connected to the flocculation tank, so as to transport the radioactive liquid after flocculation treatment in the flocculation tank to the radioactive liquid storage tank;

[0009] The top end of the first pipeline is connected to a downstream pipeline for transporting the radioactive liquid, and the tail end is connected to the top end of the radioactive liquid storage tank, for transporting the radioactive liquid filtered in the radioactive liquid storage tank to the downstream pipeline;

[0010] The top end of the third pipeline is connected to one side of the top of the radioactive liquid storage tank, and the tail end is connected to the second pipeline. The third pipeline is used to provide the backwash water to the radioactive liquid storage tank to achieve the backwash operation;

[0011] The top end of the fourth pipeline is connected to the second pipeline and is close to the bottom end of the radioactive liquid storage tank. The tail end of the fourth pipeline is connected to one side of the top of the radioactive liquid storage tank. The fourth pipeline constitutes a bypass channel of the radioactive liquid storage tank. The fourth pipeline can realize the circulation of the radioactive liquid inside the radioactive liquid storage tank.

[0012] The radioactive liquid storage tank is provided with a first pressure gauge hole and a first air vent.

[0013] further,

[0014] A first valve and a first liquid level gauge are provided on the fourth pipeline;

[0015] On the second pipeline, a feed pump, a first pressure gauge, a first damper, a first flow sensor and a pressure sensor are sequentially provided along the direction from the radioactive liquid storage tank to the flocculation tank;

[0016] The tail end of the third pipeline is located on the second pipeline between the first damper and the first flow sensor;

[0017] The tail end and the top end of the fifth pipeline are both arranged on the second pipeline and located on both sides of the first flow sensor. The fifth pipeline is used as a backup bypass.

[0018] further,

[0019] The feed pump is provided with a first motor;

[0020] The pressure sensor is provided with a pressure transmitter;

[0021] Also included are a first isolation valve, a second isolation valve, a third isolation valve, a fourth isolation valve, and a fifth isolation valve disposed on the second pipeline;

[0022] Also included are a sixth isolation valve and a seventh isolation valve disposed on the third pipeline;

[0023] Also included are an eighth isolation valve and a ninth isolation valve disposed on the fourth pipeline;

[0024] Also included is a tenth isolation valve disposed on the fifth pipeline;

[0025] The second pipeline is also provided with a twenty-fourth isolation valve, a twenty-fifth isolation valve and a twenty-sixth isolation valve for connecting to other pipelines.

[0026] further,

[0027] The backwash water feed section includes a sixth pipeline, a seventh pipeline, an eighth pipeline, a ninth pipeline, a tenth pipeline and an eleventh pipeline;

[0028] The top end of the sixth pipeline is connected to the upstream pipeline for conveying the backwash water, and the tail end is connected to the top end of the backwash water storage tank, so as to provide the backwash water to the backwash water storage tank;

[0029] The top end of the seventh pipeline is connected to the bottom end of the backwash water storage tank, and the tail end is connected to the flocculation tank, so as to transport the backwash water in the backwash water storage tank to the flocculation tank;

[0030] The top end of the eighth pipeline is connected to the top side of the backwash water storage tank, and the tail end is connected to the seventh pipeline, serving as a safety valve outlet pipeline;

[0031] The top end of the ninth pipeline is connected to the eighth pipeline, and the tail end is connected to the seventh pipeline. The ninth pipeline is used for reflux, which can reduce the amount of flushing water;

[0032] The top end of the tenth pipeline is connected to the seventh pipeline and is close to the bottom end of the backwash water storage tank. The tail end of the tenth pipeline is connected to one side of the top of the backwash water storage tank. The tenth pipeline constitutes a bypass channel of the backwash water storage tank. The backwash water inside the backwash water storage tank can be circulated through the tenth pipeline.

[0033] A second pressure gauge hole and a second air vent are provided on the backwash water storage tank.

[0034] further,

[0035] A second valve and a second liquid level gauge are provided on the tenth pipeline;

[0036] On the seventh pipeline, a third valve, a second pressure gauge, a second damper and a second flow sensor are sequentially provided along the direction from the backwash water storage tank to the flocculation tank;

[0037] The tail end of the eighth pipeline is located on the seventh pipeline between the second damper and the second flow sensor;

[0038] The tail end of the ninth pipeline is located on the seventh pipeline between the tail end of the eighth pipeline and the second flow sensor;

[0039] The tail end and the top end of the eleventh pipeline are both arranged on the seventh pipeline and located on both sides of the second flow sensor. The eleventh pipeline serves as a backup bypass.

[0040] further,

[0041] The third valve is provided with a second motor;

[0042] The second flow sensor is also provided with a second liquid flow sensor control;

[0043] Also included is an eleventh isolation valve disposed on the sixth pipeline;

[0044] Also included are a twelfth isolation valve, a thirteenth isolation valve, a fourteenth isolation valve, and a fifteenth isolation valve disposed on the seventh pipeline;

[0045] Also included are a sixteenth isolation valve and a seventeenth isolation valve disposed on the eighth pipeline;

[0046] Also included is an eighteenth isolation valve disposed on the ninth pipeline;

[0047] Also included are a nineteenth isolation valve and a twentieth isolation valve disposed on the tenth pipeline;

[0048] Also included is a twenty-first isolation valve disposed on the eleventh pipeline;

[0049] The seventh pipeline is also provided with a twenty-seventh isolation valve, a twenty-eighth isolation valve and a twenty-ninth isolation valve for connecting to other pipelines.

[0050] further,

[0051] The flocculation tank is further provided with a twelfth pipeline and a thirteenth pipeline, the thirteenth pipeline is provided with a transmitter, the twelfth pipeline is connected to the upstream pipeline for conveying the radioactive liquid, and is used to convey the radioactive liquid to the flocculation tank, and the thirteenth pipeline serves as a backwash water outlet pipeline;

[0052] Also included is a twenty-second isolation valve disposed on the twelfth pipeline;

[0053] Also included is a twenty-third isolation valve disposed on the thirteenth pipeline.

[0054] Furthermore, the feed pump, the first flow sensor and the pressure transmitter are connected via a first signal chain line to realize the interlocking of the pressure signal and the pump, and the second motor and the pressure transmitter are connected via a second signal chain line to realize the interlocking of the pressure signal and the pump.

[0055] further,

[0056] The radioactive liquid storage tank is provided with a filter for filtering the radioactive liquid;

[0057] The filter comprises a cylindrical tank body, a filter element is provided in the tank body, a first flange is provided on the top of the tank body, a second flange is provided on the bottom of the tank body, a liquid outlet is provided on the first flange, and a liquid inlet is provided on the second flange. The radioactive liquid enters the tank body through the liquid inlet, is filtered by the filter element, and flows out from the liquid outlet.

[0058] An annular welding plate is provided inside the tank body, and a filter element is provided inside the tank body;

[0059] The filter element is a sintered stainless steel filter element with a U-shaped cross section, which is arranged on the axis of the tank body. The open end of the filter element is connected to the annular welding plate through a threaded joint, and the other end of the filter element is close to the feed liquid inlet. The filter element is a replaceable filter element with different pore sizes;

[0060] A filter cake is attached to the outer surface of the filter element; when the backwash operation is performed, the backwash water flows from the liquid outlet to flush the filter element, and the filter cake can be flushed down under the action of gravity;

[0061] The bottom of the tank body is provided with a slag discharge port for discharging the liquid from the backwash operation.

[0062] The beneficial effects of the present invention are:

[0063] 1. The present invention provides a pulse backwash filter device that can be used under radioactive conditions. There is currently no report in China on a related device that can achieve backwashing under such conditions.

[0064] 2. In radioactive experiments, leakage of radioactive liquid has always been a problem that everyone tries to avoid. The present invention effectively prevents accidents such as pressure buildup and leakage of radioactive liquid caused by untimely pump shutdown when starting and stopping the experiment by designing a bypass (the fourth pipeline 7 and the tenth pipeline 26) at the storage tank.

[0065] 3. The present invention designs pressure and flow feedback methods on the feed pipeline (second pipeline 5) to effectively avoid dangerous accidents such as leakage caused by pressure buildup. Among them, the first liquid flow sensor control 14 and 19 (the signal derived from the first motor 18) is used for signal feedback to prevent flow instability caused by changes in resistance in the pipeline. The signal feedback can effectively maintain the stability of the feed flow.

[0066] 4. The filter element 51 of the present invention is a "U-shaped" sintered stainless steel filter element. The radioactive liquid enters from the bottom of the "U-shaped" sintered stainless steel filter element and is filtered "from bottom to top", which can make the filter cake evenly adhere to the surface of the filter element, thereby improving the filtration efficiency.

[0067] 5. During backwashing, the backwash water of the present invention enters from the top of the "U-shaped" sintered stainless steel filter element and performs backwashing "from top to bottom", which can effectively make the filter cake fall off with the help of gravity, thereby improving the backwashing efficiency.

[0068] 6. The present invention takes into account the pressure conditions in each section of the pipeline and each component in the start-up and shutdown states, and improves the efficiency of the equipment by rationally designing the flow direction of the filtration and backwashing fluids. The entire set of equipment of the present invention has no mechanical moving parts, the equipment is not easy to damage, has high reliability, is easy to clean and maintain, and is suitable for installation in radioactive hot cells.

[0069] 7. The present invention can conduct experimental research and verification on the filtration process of radioactive liquid, has the characteristics of high equipment safety, suitability for radioactive operations, comprehensive data acquisition, and has industrial application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0070] Figure 1 Schematic diagram of a pulse backwash filtration device suitable for radioactive liquid according to a specific embodiment of the present invention;

[0071] Figure 2 Schematic diagram of the radioactive liquid feeding section described in a specific embodiment of the present invention;

[0072] Figure 3 Schematic diagram of the backwash water feed section described in a specific embodiment of the present invention;

[0073] Figure 4 is a schematic diagram of a flocculation tank according to a specific embodiment of the present invention;

[0074] Figure 5 is a schematic diagram of a filter according to a specific embodiment of the present invention;

[0075] In the figure: 1- radioactive liquid storage tank, 2- backwash water storage tank, 3- flocculation tank, 4- first pipeline, 5- second pipeline, 6- third pipeline, 7- fourth pipeline, 8- fifth pipeline, 9- first valve, 10- first liquid level gauge, 11- feed pump, 12- first pressure gauge (local display), 13- first flow sensor, 14- first liquid flow sensor control, 15- first pressure gauge hole, 16- first air vent, 17- first damper, 18- first motor, 19- indicates the signal derived from the first motor 18, 20- indicates that the feed pump 11 can be turned on and off in the PLC system, 21- indicates that the start and stop status of the feed pump 11 can be displayed in the PLC system, 22-sixth pipeline, 23-seventh pipeline, 24-eighth pipeline, 25-ninth pipeline, 26-tenth pipeline, 27-eleventh pipeline, 28-second valve, 29-second liquid level gauge, 30-third valve, 31-second pressure gauge (local display), 32-second flow sensor, 33-second liquid flow sensor control, 34-second motor, 35-indicates motor signal, 36-indicates that the PLC system can display the pump status, 37-indicates that the PLC system can display the pump status, 38-second damper, 39-second pressure gauge hole, 40-second vent hole, 41-first signal chain line (for pressure signal and pump chain), 42-signal chain line (for (for pressure signal and pump interlocking), 43-twelfth pipeline, 44-pressure sensor, 45-pressure transmitter, 46-transmitter, 47-indicates that the flow signal of transmitter 46 is transmitted to the PLC system, 48-thirteenth pipeline, 49-first flange, 50-second flange, 51-filter element, 52-threaded joint, 53-ring welding plate, 54-liquid outlet, 55-liquid phase outlet (spare), 56-drain outlet valve, 57-liquid phase outlet, 58-slag discharge port, 59-liquid inlet, 60-first isolation valve, 61-second isolation valve, 62-third isolation valve, 63-fourth isolation valve, 64-fifth isolation valve, 65-sixth isolation valve, 66-seventh isolation valve Isolation valve, 67-eighth isolation valve, 68-ninth isolation valve, 69-tenth isolation valve, 70-eleventh isolation valve, 71-twelfth isolation valve, 72-thirteenth isolation valve, 73-fourteenth isolation valve, 74-fifteenth isolation valve, 75-sixteenth isolation valve, 76-seventeenth isolation valve, 77-eighteenth isolation valve, 78-nineteenth isolation valve, 79-twentieth isolation valve, 80-twenty-first isolation valve, 81-twenty-second isolation valve, 82-twenty-third isolation valve, 83-twenty-fourth isolation valve, 84-twenty-fifth isolation valve, 85-twenty-sixth isolation valve, 86-twenty-seventh isolation valve, 87-twenty-eighth isolation valve, 88-twenty-ninth isolation valve. DETAILED DESCRIPTION

[0076] The present invention will be further described below with reference to the accompanying drawings and examples.

[0077] The present invention provides a pulse backwash filter device suitable for radioactive liquid (see Figure 1 ), which includes a radioactive liquid feed section provided with a radioactive liquid storage tank 1 and a backwash water feed section provided with a backwash water storage tank 2, the radioactive liquid feed section and the backwash water feed section are respectively connected to the flocculation tank 3, the radioactive liquid feed section can filter the radioactive liquid sent from the flocculation tank 3 through the radioactive liquid storage tank 1 and then send it out, the backwash water feed section can backwash the radioactive liquid storage tank 1 through the backwash water in the backwash water storage tank 2, and also includes a PLC system for controlling the radioactive liquid feed section, the backwash water feed section and the flocculation tank 3.

[0078] Radioactive liquid feeding section (see Figure 2 ) includes a first pipeline 4, a second pipeline 5, a third pipeline 6, a fourth pipeline 7 and a fifth pipeline 8; the radioactive liquid storage tank 1 is capable of filtering the radioactive liquid;

[0079] The top end of the second pipeline 5 is connected to the bottom end of the radioactive liquid storage tank 1, and the tail end is connected to the flocculation tank 3, so as to transport the radioactive liquid after flocculation treatment in the flocculation tank 3 to the radioactive liquid storage tank 1;

[0080] The top end of the first pipeline 4 is connected to the downstream pipeline for transporting radioactive liquid, and the tail end is connected to the top end of the radioactive liquid storage tank 1, and is used to transport the radioactive liquid filtered in the radioactive liquid storage tank 1 to the downstream pipeline;

[0081] The top of the third pipeline 6 is connected to the top side of the radioactive liquid storage tank 1, and the tail end is connected to the second pipeline 5. The third pipeline 6 is used to provide backwash water to the radioactive liquid storage tank 1 to achieve backwashing operation;

[0082] The top end of the fourth pipeline 7 is connected to the second pipeline 5 and is close to the bottom end of the radioactive liquid storage tank 1. The tail end of the fourth pipeline 7 is connected to the top side of the radioactive liquid storage tank 1. The fourth pipeline 7 constitutes a bypass channel of the radioactive liquid storage tank 1. The fourth pipeline 7 can realize the circulation of the radioactive liquid inside the radioactive liquid storage tank 1.

[0083] A first pressure gauge hole 15 and a first air vent hole 16 are provided on the radioactive liquid storage tank 1 .

[0084] A first valve 9 and a first liquid level gauge 10 are provided on the fourth pipeline 7;

[0085] On the second pipeline 5, a feed pump 11, a first pressure gauge 12 (for local display), a first damper 17 (for reducing pump pulses and stabilizing flow), a first flow sensor 13, and a pressure sensor 44 are sequentially provided along the direction from the radioactive liquid storage tank 1 to the flocculation tank 3 (the pressure sensor 44 is located close to the flocculation tank 3 and is used to measure pressure).

[0086] The tail end of the third pipeline 6 is located on the second pipeline 5 between the first damper 17 and the first flow sensor 13;

[0087] The tail end and the top end of the fifth pipeline 8 are both arranged on the second pipeline 5 and located on both sides of the first flow sensor 13. The fifth pipeline 8 is used as a backup bypass and is used when the flow meter fails.

[0088] The feed pump 11 is provided with a first motor 18; Figure 2 Among them, 19 represents the signal derived from the first motor 18, 20 represents that the feed pump 11 can be turned on and off in the PLC system, 21 represents that the start and stop status of the feed pump 11 can be displayed in the PLC system, and 14 represents that the signal of the first flow sensor 13 (the transmitter head on site) has been transmitted to the PLC system;

[0089] The pressure sensor 44 is provided with a pressure transmitter 45;

[0090] It also includes a first isolation valve 60, a second isolation valve 61, a third isolation valve 62, a fourth isolation valve 63 and a fifth isolation valve 64 provided on the second pipeline 5;

[0091] Also included are a sixth isolation valve 65 and a seventh isolation valve 66 provided on the third pipeline 6;

[0092] Also included are an eighth isolation valve 67 and a ninth isolation valve 68 provided on the fourth pipeline 7;

[0093] Also included is a tenth isolation valve 69 provided on the fifth pipeline 8;

[0094] The second pipeline 5 is also provided with a twenty-fourth isolation valve 83, a twenty-fifth isolation valve 84 and a twenty-sixth isolation valve 85 for connecting to other pipelines.

[0095] Backwash water feed section (see Figure 3 ) includes a sixth pipeline 22, a seventh pipeline 23, an eighth pipeline 24, a ninth pipeline 25, a tenth pipeline 26 and an eleventh pipeline 27;

[0096] The top end of the sixth pipeline 22 is connected to the upstream pipeline for conveying backwash water, and the tail end is connected to the top end of the backwash water storage tank 2, for providing backwash water to the backwash water storage tank 2;

[0097] The top of the seventh pipeline 23 (the backwash water inlet pipeline) is connected to the bottom of the backwash water storage tank 2, and the tail end is connected to the flocculation tank 3, so as to transport the backwash water in the backwash water storage tank 2 to the flocculation tank 3;

[0098] The top of the eighth pipeline 24 is connected to the top side of the backwash water storage tank 2, and the tail end is connected to the seventh pipeline 23, serving as the safety valve outlet pipeline for protecting the positive displacement pump and related systems;

[0099] The top of the ninth pipeline 25 is connected to the eighth pipeline 24, and the tail end is connected to the seventh pipeline 23. The ninth pipeline 25 is a spare port for backflow, which can reduce the amount of flushing water;

[0100] The top end of the tenth pipeline 26 is connected to the seventh pipeline 23 and is close to the bottom end of the backwash water storage tank 2. The tail end of the tenth pipeline 26 is connected to the top side of the backwash water storage tank 2. The tenth pipeline 26 constitutes a bypass channel of the backwash water storage tank 2. The tenth pipeline 26 can realize the circulation of backwash water inside the backwash water storage tank 2.

[0101] A second pressure gauge hole 39 and a second air vent hole 40 are provided on the backwash water storage tank 2 .

[0102] A second valve 28 and a second level gauge 29 are provided on the tenth pipeline 26;

[0103] On the seventh pipeline 23, along the direction from the backwash water storage tank 2 to the flocculation tank 3, a third valve 30, a second pressure gauge 31 (on-site display), a second damper 38 (to reduce pump pulses and stabilize flow), and a second flow sensor 32 (the second flow sensor 32 is close to the flocculation tank 3) are sequentially provided;

[0104] The tail end of the eighth pipeline 24 is located on the seventh pipeline 23 between the second damper 38 and the second flow sensor 32;

[0105] The tail end of the ninth pipeline 25 is located on the seventh pipeline 23 between the tail end of the eighth pipeline 24 and the second flow sensor 32;

[0106] The tail end and the top end of the eleventh pipeline 27 are both arranged on the seventh pipeline 23 and located on both sides of the second flow sensor 32. The eleventh pipeline 27 serves as a backup bypass and is used when the flow meter fails.

[0107] The third valve 30 is provided with a second motor 34; Figure 3 Among them, 35 indicates the motor signal, 36 indicates that the PLC system can display the pump status, and 37 indicates that the PLC system can start and stop the pump;

[0108] The second flow sensor 32 is also provided with a second liquid flow sensor control 33;

[0109] Also included is an eleventh isolation valve 70 disposed on the sixth pipeline 22;

[0110] Also included are a twelfth isolation valve 71 , a thirteenth isolation valve 72 , a fourteenth isolation valve 73 and a fifteenth isolation valve 74 provided on the seventh pipeline 23 ;

[0111] Also included are a sixteenth isolation valve 75 and a seventeenth isolation valve 76 provided on the eighth pipeline 24;

[0112] Also included is an eighteenth isolation valve 77 provided on the ninth pipeline 25;

[0113] Also included are a nineteenth isolation valve 78 and a twentieth isolation valve 79 provided on the tenth pipeline 26;

[0114] Also included is a twenty-first isolation valve 80 provided on the eleventh pipeline 27;

[0115] The seventh pipeline 23 is also provided with a twenty-seventh isolation valve 86, a twenty-eighth isolation valve 87 and a twenty-ninth isolation valve 88 for connecting to other pipelines.

[0116] The flocculation tank 3 is also provided with a twelfth pipeline 43 and a thirteenth pipeline 48 (see Figure 4 ), a transmitter 46 is provided on the thirteenth pipeline 48; Figure 4 In the figure, 47 indicates that the flow signal of the transmitter 46 is transmitted to the PLC system; the twelfth pipeline 43 is connected to the upstream pipeline for conveying radioactive liquid, and is used to convey radioactive liquid to the upstream pipeline; the thirteenth pipeline 48 is used as the backwash water outlet pipeline (also a maintenance valve);

[0117] Also included is a twenty-second isolation valve 81 provided on the twelfth pipeline 43;

[0118] A twenty-third isolation valve 82 is also included, which is disposed on the thirteenth pipeline 48 .

[0119] The feed pump 11, the first flow sensor 13 and the pressure transmitter 45 are connected via a first signal chain line 41 to realize the interlocking of the pressure signal and the pump. The second motor 34 and the pressure transmitter 45 are connected via a second signal chain line 42 to realize the interlocking of the pressure signal and the pump.

[0120] The radioactive liquid storage tank 1 is provided with a filter (see Figure 5 ), used to filter radioactive liquid;

[0121] The filter comprises a cylindrical tank body, in which a filter element 51 is disposed. A first flange 49 (quick-opening flange) is disposed on the top of the tank body, and a second flange 50 (detachable) is disposed on the bottom of the tank body. A liquid outlet 54 is disposed on the first flange 49, and a liquid inlet 59 is disposed on the second flange 50. Radioactive liquid enters the tank body through the liquid inlet 59, is filtered by the filter element 51, and then flows out of the liquid outlet 54.

[0122] An annular welding plate 53 is provided inside the tank body, and a filter element 51 is provided inside the tank body;

[0123] The filter element 51 is a sintered stainless steel filter element with a U-shaped cross section. It is arranged on the axis of the tank body. The open end of the filter element 51 is connected to the annular welding plate 53 through a threaded joint 52. The other end of the filter element 51 (the closed end) is close to the liquid inlet 59. The filter element 51 is a replaceable filter element with different pore sizes.

[0124] The filter cake is attached to the outer surface of the filter element 51, with the liquid outlet 54 at the bottom and the filtered liquid inlet 59 at the top. This design allows the filter cake to be more evenly adhered to the surface of the filter element 51. During backwashing, backwashing water flows from the liquid outlet 54 to flush the filter element 51, and the filter cake can be easily washed down by the backwashing water under the action of gravity.

[0125] A slag discharge port 58 is provided at the bottom of the tank body for discharging the liquid from the backwash operation.

[0126] Finally, the specific application of the present invention is described:

[0127] First, the main control computer is turned on to monitor the readings on various instruments (all instruments and electrical equipment are connected to the PLC system via signal lines, and the relevant functions of the PLC system are displayed on the main control computer's display). The valves on the radioactive liquid delivery pipeline (second pipeline 5) are then opened (note that the valves on the bypass fourth pipeline 7 should not be opened). The feed pump 11 is then turned on to allow the radioactive liquid to pass through the filter element 51 in the radioactive liquid storage tank 1. As filtration progresses, the resistance of the filter element 51 increases. When the pressure difference between the liquid outlet 54 and the liquid inlet 59 reaches a specified value, the system determines that the filter element 51 has reached the specified load and automatically opens the valve and pump on the bypass (fourth pipeline 7) of the radioactive liquid storage tank to circulate the radioactive liquid. The valves on the radioactive liquid delivery pipeline (second pipeline 5) and the feed pump 11 are then closed in sequence, stopping the feeding of the radioactive liquid. At this point, the slag discharge port 58 below the filter is opened to drain the remaining liquid inside the filter. After draining the liquid from the filter, open the valves and pump on the backwash water delivery pipeline (line 7, line 23) in sequence (note that the valves on the bypass line 10, line 26, should not be opened) to begin backwashing. After a specified number of pulse flushes, stop backwashing. At this point, the filter element is regenerated. Open the valve and pump on the bypass line (line 10, line 26) to the backwash water storage tank, then close the valves and pump on the backwash water delivery pipeline (line 7, line 23) in sequence. Finally, open the valve and pump on the radioactive liquid pipeline (line 2, line 5) to continue filtration. Repeat this process.

[0128] The device described in the present invention is not limited to the embodiments described in the specific implementation manner. Those skilled in the art may derive other implementation manners based on the technical solution of the present invention, which also fall within the scope of the technical innovation of the present invention.

Claims

1. A pulse backwash filter device suitable for radioactive liquid, characterized by: The invention comprises a radioactive liquid feeding section provided with a radioactive liquid storage tank (1) and a backwashing water feeding section provided with a backwashing water storage tank (2), wherein the radioactive liquid feeding section and the backwashing water feeding section are respectively connected to a flocculation tank (3), the radioactive liquid feeding section can filter the radioactive liquid sent from the flocculation tank (3) through the radioactive liquid storage tank (1) and then send it out, and the backwashing water feeding section can perform a backwashing operation on the radioactive liquid storage tank (1) through the backwashing water in the backwashing water storage tank (2); The radioactive liquid feed section comprises a first pipeline (4), a second pipeline (5), a third pipeline (6), a fourth pipeline (7) and a fifth pipeline (8); the radioactive liquid storage tank (1) is capable of filtering the radioactive liquid; The top end of the second pipeline (5) is connected to the bottom end of the radioactive liquid storage tank (1), and the tail end is connected to the flocculation tank (3), and is used to transport the radioactive liquid after flocculation treatment in the flocculation tank (3) to the radioactive liquid storage tank (1); The top end of the first pipeline (4) is connected to a downstream pipeline for transporting the radioactive liquid, and the tail end is connected to the top end of the radioactive liquid storage tank (1), and is used to transport the radioactive liquid filtered from the radioactive liquid storage tank (1) to the downstream pipeline; The top end of the third pipeline (6) is connected to one side of the top of the radioactive liquid storage tank (1), and the tail end is connected to the second pipeline (5). The third pipeline (6) is used to provide the backwash water to the radioactive liquid storage tank (1) to achieve the backwash operation; The top end of the fourth pipeline (7) is connected to the second pipeline (5) and is close to the bottom end of the radioactive liquid storage tank (1); the tail end of the fourth pipeline (7) is connected to one side of the top of the radioactive liquid storage tank (1); the fourth pipeline (7) constitutes a bypass channel of the radioactive liquid storage tank (1); and the fourth pipeline (7) can realize the circulation of the radioactive liquid inside the radioactive liquid storage tank (1); A first pressure gauge hole (15) and a first air vent (16) are provided on the radioactive liquid storage tank (1); A first valve (9) and a first liquid level gauge (10) are provided on the fourth pipeline (7); On the second pipeline (5), a feed pump (11), a first pressure gauge (12), a first damper (17), a first flow sensor (13), and a pressure sensor (44) are sequentially provided along the direction from the radioactive liquid storage tank (1) to the flocculation tank (3); The tail end of the third pipeline (6) is located on the second pipeline (5) between the first damper (17) and the first flow sensor (13); The tail end and the top end of the fifth pipeline (8) are both arranged on the second pipeline (5) and located on both sides of the first flow sensor (13). The fifth pipeline (8) is used as a backup bypass.

2. A pulse backwash filter device suitable for radioactive liquid as claimed in claim 1, characterized in that: The feed pump (11) is provided with a first motor (18); The pressure sensor (44) is provided with a pressure transmitter (45); It also includes a first isolation valve (60), a second isolation valve (61), a third isolation valve (62), a fourth isolation valve (63) and a fifth isolation valve (64) provided on the second pipeline (5); It also includes a sixth isolation valve (65) and a seventh isolation valve (66) provided on the third pipeline (6); It also includes an eighth isolation valve (67) and a ninth isolation valve (68) provided on the fourth pipeline (7); Also included is a tenth isolation valve (69) provided on the fifth pipeline (8); The second pipeline (5) is also provided with a twenty-fourth isolation valve (83), a twenty-fifth isolation valve (84) and a twenty-sixth isolation valve (85) for connecting to other pipelines.

3. A pulse backwash filter device suitable for radioactive liquid as claimed in claim 2, characterized in that: The backwash water feed section includes a sixth pipeline (22), a seventh pipeline (23), an eighth pipeline (24), a ninth pipeline (25), a tenth pipeline (26) and an eleventh pipeline (27); The top end of the sixth pipeline (22) is connected to the upstream pipeline for conveying the backwash water, and the tail end is connected to the top end of the backwash water storage tank (2), so as to provide the backwash water to the backwash water storage tank (2); The top end of the seventh pipeline (23) is connected to the bottom end of the backwash water storage tank (2), and the tail end is connected to the flocculation tank (3), so as to transport the backwash water in the backwash water storage tank (2) to the flocculation tank (3); The top end of the eighth pipeline (24) is connected to the top side of the backwash water storage tank (2), and the tail end is connected to the seventh pipeline (23), serving as a safety valve outlet pipeline; The top end of the ninth pipeline (25) is connected to the eighth pipeline (24), and the tail end is connected to the seventh pipeline (23). The ninth pipeline (25) is used for reflux, which can reduce the amount of flushing water; The top end of the tenth pipeline (26) is connected to the seventh pipeline (23) and is close to the bottom end of the backwash water storage tank (2). The tail end of the tenth pipeline (26) is connected to one side of the top of the backwash water storage tank (2). The tenth pipeline (26) constitutes a bypass channel of the backwash water storage tank (2). The backwash water inside the backwash water storage tank (2) can be circulated through the tenth pipeline (26). A second pressure gauge hole (39) and a second air vent (40) are provided on the backwash water storage tank (2).

4. A pulse backwash filter device suitable for radioactive liquid as claimed in claim 3, characterized in that: exist The tenth pipeline (26) is provided with a second valve (28) and a second liquid level gauge (29); On the seventh pipeline (23), a third valve (30), a second pressure gauge (31), a second damper (38) and a second flow sensor (32) are sequentially provided along the direction from the backwash water storage tank (2) to the flocculation tank (3); The tail end of the eighth pipeline (24) is located on the seventh pipeline (23) between the second damper (38) and the second flow sensor (32); The tail end of the ninth pipeline (25) is located on the seventh pipeline (23) between the tail end of the eighth pipeline (24) and the second flow sensor (32); The tail end and the top end of the eleventh pipeline (27) are both arranged on the seventh pipeline (23) and located on both sides of the second flow sensor (32). The eleventh pipeline (27) serves as a backup bypass.

5. A pulse backwash filter device suitable for radioactive liquid as claimed in claim 4, characterized in that: The third valve (30) is provided with a second motor (34); The second flow sensor (32) is also provided with a second liquid flow sensor control (33); Also included is an eleventh isolation valve (70) disposed on the sixth pipeline (22); It also includes a twelfth isolation valve (71), a thirteenth isolation valve (72), a fourteenth isolation valve (73) and a fifteenth isolation valve (74) provided on the seventh pipeline (23); It also includes a sixteenth isolation valve (75) and a seventeenth isolation valve (76) provided on the eighth pipeline (24); Also included is an eighteenth isolation valve (77) disposed on the ninth pipeline (25); Also included are a nineteenth isolation valve (78) and a twentieth isolation valve (79) disposed on the tenth pipeline (26); Also included is a twenty-first isolation valve (80) disposed on the eleventh pipeline (27); The seventh pipeline (23) is also provided with a twenty-seventh isolation valve (86), a twenty-eighth isolation valve (87) and a twenty-ninth isolation valve (88) for connecting to other pipelines.

6. A pulse backwash filter device suitable for radioactive liquid as claimed in claim 5, characterized in that: The flocculation tank (3) is further provided with a twelfth pipeline (43) and a thirteenth pipeline (48), and the thirteenth pipeline (48) is provided with a transmitter (46); the twelfth pipeline (43) is connected to an upstream pipeline for conveying the radioactive liquid, and is used to convey the radioactive liquid to the upstream pipeline, and the thirteenth pipeline (48) serves as a backwash water outlet pipeline; Also included is a twenty-second isolation valve (81) provided on the twelfth pipeline (43); Also included is a twenty-third isolation valve (82) disposed on the thirteenth pipeline (48).

7. A pulse backwash filter device suitable for radioactive liquid as claimed in claim 6, characterized in that: The feed pump (11), the first flow sensor (13) and the pressure transmitter (45) are connected via a first signal interlock line (41) to achieve pressure signal interlocking with the pump, and the second motor (34) and the pressure transmitter (45) are connected via a second signal interlock line (42) to achieve pressure signal interlocking with the pump.

8. The pulse backwash filter device for radioactive liquid according to claim 7, characterized in that: The radioactive liquid storage tank (1) is provided with a filter for filtering the radioactive liquid; The filter comprises a cylindrical tank body, a filter element (51) is provided in the tank body, a first flange (49) is provided on the top of the tank body, a second flange (50) is provided on the bottom of the tank body, a liquid outlet (54) is provided on the first flange (49), and a liquid inlet (59) is provided on the second flange (50), the radioactive liquid enters the tank body through the liquid inlet (59), is filtered by the filter element (51), and then flows out from the liquid outlet (54); An annular welding plate (53) is provided inside the tank body, and a filter element (51) is provided inside the tank body; The filter element (51) is a sintered stainless steel filter element with a U-shaped cross section, which is arranged on the axis of the tank body. One open end of the filter element (51) is connected to the annular welding plate (53) through a threaded joint (52), and the other end of the filter element (51) is close to the feed liquid inlet (59). The filter element (51) is a replaceable filter element with different pore sizes. A filter cake is attached to the outer surface of the filter element (51); when the backwashing operation is performed, the backwashing water flows in from the liquid outlet (54) to flush the filter element (51), and the filter cake can be flushed down under the action of gravity; The bottom of the tank body is provided with a slag discharge port (58) for discharging the liquid from the backwashing operation.

Images