CN217051910U - Spent fuel pool sterilizing device - Google Patents
Spent fuel pool sterilizing device Download PDFInfo
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- CN217051910U CN217051910U CN202122685695.XU CN202122685695U CN217051910U CN 217051910 U CN217051910 U CN 217051910U CN 202122685695 U CN202122685695 U CN 202122685695U CN 217051910 U CN217051910 U CN 217051910U
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Abstract
The utility model particularly relates to a spent fuel pool sterilizing equipment, including installing the ultraviolet sterilization carbon removal deaerating plant on spent fuel pool purification loop. The utility model provides a spent fuel pool sterilizing equipment does not have the corruption to spent fuel pool, does not increase radioactive waste, and bactericidal effect is good.
Description
Technical Field
The utility model relates to a nuclear waste processing technology field especially relates to a spent fuel pool sterilizing equipment.
Background
The nuclear power plant spent fuel pool is used for receiving and storing spent fuel replaced from a reactor core during operation, and is provided with a cooling and purifying system for providing shielding of a spent fuel water entity, controlling the temperature of the spent fuel pool and maintaining the purposes of water quality clarification and low radioactivity level of the spent fuel pool. The spent fuel pool of the heavy water reactor nuclear power plant is operated without adding boric acid, and during the operation, the filter replacement period is found to be reduced from 18 months to an average period of only 6 months. Through disassembling the equipment and investigating and analyzing, the spent fuel pool is found to have a large amount of microorganism growth.
The heavy water reactor nuclear power station adopts an operation mode of improving the flow rate of purified water, and microorganisms are still not thoroughly solved. The spent fuel pool slime is analyzed and researched to be confirmed as a microbial metabolite; slime production is due to bacteria, not algae and fungi; the bacterial species are aerobic gram-positive streptococcus and a small amount of aerobic gram-positive brevibacterium; slime bacteria are autotrophic bacteria, and the carbon source is inorganic carbon, namely carbon dioxide dissolved in water. The influence of the microorganisms and the slime on the spent fuel cooling and purifying system comprises the aspects of reduction of purifying flow, corrosion of equipment, increase of radioactive wastes and the like caused by the slime. The micro-pores of the filter are blocked and the pressure difference is quickly increased due to the microorganisms, so that the filter is frequently replaced; the microorganism and the slime can cause the pressure difference of the purifying resin bed to rise, and also can cause the pore channel of the ion exchange resin to be blocked, so that the purifying capacity of the resin bed is lost; the oxygen concentration cell corrosion is formed on the metal surface by the microorganisms and the metabolites thereof, and the local intergranular corrosion is caused by the depolarization of the cathode.
The cooling flow is reduced due to mass propagation of microorganisms, the heat transfer efficiency of a heat exchanger is reduced, and the cooling function of the spent fuel pool is influenced; the filter and the purification bed are blocked, the pressure difference rises, the purification flow rate falls, and the water quality purification function of the spent fuel pool and the nuclear waste increase are further influenced. At present, the methods for effectively solving the problem of microorganism propagation in the spent fuel pool mainly comprise the following two methods: firstly, adding a boric acid solution into a spent fuel pool by utilizing the disinfection and corrosion prevention functions of boric acid to inhibit the reproduction of microorganisms in the spent fuel pool, but the boric acid has a certain corrosion function on the steel surface of the spent fuel pool; and secondly, discontinuously sterilizing the non-oxidizing bactericide in the spent fuel pool purification loop, and replacing the filter and the purification bed resin when the water quality approaches the control index, but slightly increasing the generation amount of radioactive waste.
SUMMERY OF THE UTILITY MODEL
Therefore, it is necessary to provide a spent fuel pool sterilization device, which has no corrosion to the spent fuel pool, does not increase radioactive wastes, and has a good sterilization effect, aiming at the problems that the existing method for inhibiting the propagation of microorganisms in the spent fuel pool corrodes the spent fuel pool and increases the radioactive wastes.
In order to achieve the above object, the present invention provides the following technical solutions:
a spent fuel pool sterilizing device comprises an ultraviolet sterilizing, carbon removing and oxygen removing device which is arranged on a spent fuel pool purifying loop.
The working principle is as follows: and (4) conveying the water at the bottom of the spent fuel pool to an ultraviolet sterilization, carbon removal and oxygen removal device, and returning the water to the spent fuel pool after ultraviolet sterilization, carbon removal and oxygen removal.
Further, the spent fuel pool purifies the return circuit and includes spent fuel pool, elevator pump, mixes a filter and resin and purifies the bed, spent fuel pool bottom in proper order with the elevator pump, mix a filter and resin and purify bed top tube coupling, resin purifies bed bottom and spent fuel pool top tube coupling. And water at the bottom of the spent fuel pool is pumped to the mixed bed filter and the resin purification bed through the lifting pump, filtered and purified and then returned to the spent fuel pool.
Further, the ultraviolet sterilization carbon removal oxygen removal device is arranged on a pipeline between the lift pump and the mixed bed filter.
Furtherly, ultraviolet sterilization removes carbon deaerating plant includes ultraviolet sterilization and removes carbon deaerator and booster pump, fuel pool bottom in proper order with elevator pump and ultraviolet sterilization remove carbon deaerator top tube coupling, ultraviolet sterilization removes carbon deaerator bottom in proper order with the booster pump, mix a filter and resin and purify a top tube coupling, resin purifies bed bottom and spent fuel pool top tube coupling. Water at the bottom of the spent fuel pool is pumped to the top of the ultraviolet sterilization carbon-removal deaerator through the lifting pump to form small annular streams, and the small annular streams are sent to the mixed bed filter and the resin purification bed through the booster pump to return to the spent fuel pool after being subjected to filtration and purification after being subjected to ultraviolet sterilization carbon-removal deaerator ultraviolet sterilization and deaerating.
Further, the bottom of the resin purification bed is connected with a pipeline at the top of the ultraviolet sterilization and carbon removal deaerator, and a sterilization recirculation valve is arranged on a pipeline connecting the bottom of the resin purification bed and the top of the ultraviolet sterilization and carbon removal deaerator. And opening the sterilization recirculation valve, and circulating the water in the resin purification bed into the ultraviolet sterilization carbon-removal deaerator to perform ultraviolet sterilization carbon-removal deaerator.
Further, the ultraviolet sterilization decarbonization deaerator comprises a decarbonization tower, an ultraviolet device, a water distribution device, an air blower, a water collection tank and a carbon dioxide discharge port; an air blower is arranged at the bottom of the decarburization tower, a water distribution device and a carbon dioxide discharge port are arranged at the top of the decarburization tower, an ultraviolet device and an air distribution device are sequentially arranged in the decarburization tower from top to bottom, and a water collection tank is arranged right below the decarburization tower; spent fuel pond bottom in proper order with elevator pump and decarbonization tower top tube coupling, the header tank with in proper order with booster pump, mix bed filter and resin and purify bed top tube coupling, resin purifies bed bottom and spent fuel pond top tube coupling. The water at the bottom of the spent fuel pool is sent to the top of the decarbonization tower through a lifting pump to form small annular flows, and the small annular flows are sent to the mixed bed filter and the resin purification bed through a booster pump to be returned to the spent fuel pool after being filtered and purified after being subjected to ultraviolet sterilization, carbon removal and oxygen removal.
Further, the water distribution device comprises a porous 304 stainless steel flat plate and a multi-surface hollow plastic ball, the multi-surface hollow plastic ball is mounted on the porous 304 stainless steel flat plate, and water at the bottom of the spent fuel pool is pumped by a lifting pump to the top of the decarburization tower to form small annular trickles through the water distribution device.
Further, the air distribution device is a fishbone type 304 stainless steel perforated pipe.
Further, the power of the air blower is 2KW, and the air volume is 2400Nm 3 。
Furthermore, the ultraviolet device comprises a plurality of groups of ultraviolet lamp tube assemblies, each group of ultraviolet lamp tube assemblies is formed by connecting four ultraviolet lamp tubes end to form a square, each ultraviolet lamp tube is a 265nm ultraviolet lamp tube with the length of 1100cm, the diameter of 30cm and the power of 120W, and the daily treated water amount is 4500 tons.
Furthermore, the ultraviolet lamp tube adopts a mirror surface reflection arrangement, and the sterilization efficiency is increased by 30%.
Furthermore, a control switch of an ultraviolet lamp tube is arranged outside the decarburization tower, the control switch of the ultraviolet lamp tube is connected with a control circuit of a spent fuel pool purification loop, and the spent fuel pool purification loop is started and stopped to drive the ultraviolet lamp tube to be started and stopped.
Further, the decarbonizing tower has the length of 1200cm, the width of 1200cm, the height of 5150cm and the thickness of 10 cm; the decarbonization tower is made of glass fiber reinforced plastic materials, and the thickness of the filler layer is 1000 cm.
Further, the water collecting tank is a 304 stainless steel water tank which is 4010cm in length, 3010cm in width and 3010cm in height.
The utility model has the advantages of that:
the spent fuel pool sterilizing device of the utility model integrates the functions of killing microorganisms, removing TOC and inorganic carbon, and effectively solves the problem of microorganism propagation of the spent fuel pool without boric acid operation; the sterilization method has the advantages that the sterilization effect is good by adopting ultraviolet rays for sterilization, the generation amount of radioactive wastes is hardly increased, impurities are not introduced into water, the smell of the water is not additionally increased, sterilization byproducts such as trihalomethane and the like are not generated, the sterilization range is wide and rapid, the treatment time is short, the water quality problem cannot be caused by over-treatment, and the method is suitable for the application scene of the spent fuel pool.
The utility model discloses a spent fuel pool sterilizing equipment, low cost, the bactericidal effect is good, simple structure, simple to operate, operation and management are convenient, easily realize the automation, are favorable to the safety and stability operation of power plant.
Drawings
FIG. 1 is a schematic diagram of a spent fuel pool purification loop;
fig. 2 is a schematic structural view of a spent fuel pool purification loop for installing the spent fuel pool sterilization device of the present invention;
fig. 3 is a front view of the spent fuel pool sterilization device of the present invention;
fig. 4 is a top view of the spent fuel pool sterilization apparatus of the present invention.
In the figure, 1, a spent fuel pool; 2. a lift pump; 3. a mixed bed filter; 4. a resin purification bed; 5. a booster pump; 6. an ultraviolet sterilization carbon removal deaerator; 7. a sterilizing recirculation valve; 8. a decarbonizing tower; 9. an ultraviolet device; 10. a water distribution device; 11. a wind distribution device; 12. a blower; 13. a water collection tank; 14. an ultraviolet lamp tube assembly; 15. a control switch of the ultraviolet lamp tube; 16. a carbon dioxide discharge port.
Detailed Description
In the description of the present invention, it is to be understood that the terms "left end", "right end", "above", "below", "outside", "inside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1, the spent fuel pool purification loop comprises a spent fuel pool 1, a lift pump 2, a mixed bed filter 3 and a resin purification bed 4, wherein the bottom of the spent fuel pool 1 is sequentially connected with the lift pump 2, the mixed bed filter 3 and the top of the resin purification bed 4 through pipelines, and the bottom of the resin purification bed 4 is connected with the top of the spent fuel pool 1 through a pipeline. The water at the bottom of the spent fuel pool 1 is sent to the mixed bed filter 3 and the resin purification bed 4 through the lift pump 2 and returns to the spent fuel pool 1 after being filtered and purified.
Referring to fig. 2, the utility model provides a spent fuel pool sterilizing equipment, including installing the ultraviolet sterilization carbon removal deaerating plant on spent fuel pool purification loop, ultraviolet sterilization carbon removal deaerating plant installs on the pipeline between elevator pump 2 and mixed bed filter 3. And the water at the bottom of the spent fuel pool 1 is sent to an ultraviolet sterilization carbon removal and oxygen removal device, and returns to the spent fuel pool 1 after being subjected to ultraviolet sterilization carbon removal and oxygen removal.
Ultraviolet sterilization removes carbon deaerating plant and includes ultraviolet sterilization and removes carbon oxygen-eliminating device 6 and booster pump 5, 1 bottom in spent fuel pool removes carbon oxygen-eliminating device 6 top tube coupling with elevator pump 2 and ultraviolet sterilization in proper order, 6 bottoms in ultraviolet sterilization removes carbon oxygen-eliminating device and purifies 4 top tube couplings of bed with booster pump 5, mixed bed filter 3 and resin in proper order, resin purifies 4 bottoms and 1 top tube coupling in spent fuel pool. Water at the bottom of the spent fuel pool 1 is sent to the top of the ultraviolet sterilization and carbon removal deaerator 6 through the lifting pump 2 to form annular small trickle, and after the small trickle passes through the ultraviolet sterilization and carbon removal deaerator 6 and is subjected to ultraviolet sterilization and carbon removal deaerator, the small trickle is sent to the mixed bed filter 3 and the resin purification bed 4 through the booster pump 5 and is returned to the spent fuel pool 1 after being filtered and purified.
The resin purifies 4 bottoms of bed and still removes carbon deaerator 6 top tube couplings with ultraviolet sterilization, resin purifies 4 bottoms of bed and sets up recirculation valve 7 that disinfects on the pipeline of being connected with 6 tops of ultraviolet sterilization carbon deaerator. And (4) opening the sterilization recirculation valve 7, and circulating the water in the resin purification bed 4 into the ultraviolet sterilization carbon-removal deaerator 6 for ultraviolet sterilization carbon-removal deaerator.
Referring to fig. 3-4, the ultraviolet sterilization decarbonization deaerator 6 comprises a decarburization tower 8, an ultraviolet device 9, a water distribution device 10, an air distribution device 11, a blower 12 and a water collection tank 13;
an air blower 12 is arranged at the bottom of the decarburization tower 8, a water distribution device 10 is arranged at the top of the decarburization tower 8, an ultraviolet device 9 and an air distribution device 11 are sequentially arranged in the decarburization tower 8 from top to bottom, and a water collection tank 13 is arranged right below the decarburization tower 8;
the fuel pool bottom in proper order with elevator pump 2 and the pipeline connection in decarbonization tower 8 top, header tank 13 with in proper order with booster pump 5, mix bed filter 3 and resin and purify 4 top pipeline connections in bed, resin purifies 4 bottoms in bed and 1 top pipeline connection in spent fuel pool. Water at the bottom of the spent fuel pool 1 is sent to the top of the decarbonization tower 8 through the lift pump 2 to form annular trickle, and the trickle is sent to the mixed bed filter 3 and the resin purification bed 4 through the booster pump 5 after being sterilized by ultraviolet rays, decarbonized and deoxygenated and then returned to the spent fuel pool 1 after being filtered and purified.
The water distribution device 10 comprises a porous 304 stainless steel flat plate and multi-surface hollow plastic balls, the multi-surface hollow plastic balls are mounted on the porous 304 stainless steel flat plate, and water at the bottom of the spent fuel pool 1 is sent to the top of the decarbonization tower 8 through the lifting pump 2 to form annular small trickle through the water distribution device 10, so that uniform water distribution is ensured.
The air distribution device 11 is a fishbone type 304 stainless steel perforated pipe.
The power of the blower is 2KW, and the air volume is 2400Nm 3 。
The ultraviolet device 9 comprises a plurality of groups of ultraviolet lamp tube assemblies 14, each group of ultraviolet lamp tube assemblies 14 is formed by connecting four ultraviolet lamp tubes end to form a square, each ultraviolet lamp tube is a 265nm ultraviolet lamp tube with the length of 1100cm, the diameter of 30cm and the power of 120W, and the daily treated water amount is 4500 tons.
The ultraviolet lamp tube adopts mirror surface reflection arrangement, and the sterilization efficiency is increased by 30%.
The decarbonizing tower 8 is 1200cm long, 1200cm wide, 5150cm high and 10cm thick; the decarbonization tower 8 is made of glass fiber reinforced plastic materials, and the thickness of a filler layer is 1000 cm.
The water collecting tank 13 is a 304 stainless steel water tank with the length 4010cm, the width 3010cm and the height 3010 cm.
The decarbonizing tower 8 is externally provided with a control switch 15 of an ultraviolet lamp tube, the control switch 15 of the ultraviolet lamp tube is connected with a control circuit of a spent fuel pool purification loop, and the spent fuel pool purification loop is started and stopped to drive the ultraviolet lamp tube to be started and stopped without manual intervention.
The top of the decarbonizing tower 8 is provided with a carbon dioxide discharge port 16.
Water from the bottom of the spent fuel pool 1 passes through a lift pump 2 to form small annular trickles at the top of the sterilization device, the small annular trickles pass through ultraviolet sterilization and a blower 12 to remove CO2 and O2, and then pass through a booster pump 5 to return to the spent fuel pool 1 through a filter and a resin purification bed 4. After the system is improved, the system can sterilize, remove carbon and oxygen, improve the water quality of a purification loop, play a role in controlling 1 microorganism in the spent fuel pool, and better protect purification bed resin, thereby reducing the generation of nuclear waste and maintaining the safe and stable operation of a power plant.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the concept of the present invention, several variations and modifications can be made, which all fall within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (8)
1. A spent fuel pool sterilization device is characterized by comprising an ultraviolet sterilization, carbon removal and oxygen removal device arranged on a spent fuel pool purification loop;
the spent fuel pool purification loop comprises a spent fuel pool (1), a lift pump (2), a mixed bed filter (3) and a resin purification bed (4), wherein the bottom of the spent fuel pool (1) is sequentially connected with the lift pump (2), the mixed bed filter (3) and a top pipeline of the resin purification bed (4), and the bottom of the resin purification bed (4) is connected with the top pipeline of the spent fuel pool (1);
ultraviolet sterilization removes carbon deoxidization device and includes ultraviolet sterilization removes carbon deoxidization ware (6) and booster pump (5), fuel pool (1) bottom in proper order with elevator pump (2) and ultraviolet sterilization remove carbon deoxidization ware (6) top tube coupling, ultraviolet sterilization removes carbon deoxidization ware (6) bottom in proper order with booster pump (5), mix bed filter (3) and resin and purify bed (4) top tube coupling.
2. The spent fuel pool sterilizing device according to claim 1, wherein the ultraviolet sterilization, carbon removal and oxygen removal device is installed on a pipeline between the lift pump (2) and the mixed bed filter (3).
3. The spent fuel pool sterilizing device according to claim 1, wherein the bottom of the resin purification bed (4) is further connected with a pipeline at the top of the ultraviolet sterilization carbon-removal deaerator (6), and a sterilization recirculation valve (7) is arranged on a pipeline at the bottom of the resin purification bed (4) connected with the top of the ultraviolet sterilization carbon-removal deaerator (6).
4. The spent fuel pool sterilizing device according to claim 1, wherein the ultraviolet sterilizing and carbon removing deaerator (6) comprises a decarburization tower (8), an ultraviolet device (9), a water distribution device (10), an air distribution device (11), a blower (12), a water collection tank (13) and a carbon dioxide discharge port (16); an air blower (12) is arranged at the bottom of the decarburization tower (8), a water distribution device (10) and a carbon dioxide discharge port (16) are arranged at the top of the decarburization tower (8), an ultraviolet device (9) and an air distribution device (11) are sequentially arranged in the decarburization tower (8) from top to bottom, and a water collection tank (13) is arranged right below the decarburization tower (8); spent fuel pool (1) bottom in proper order with elevator pump (2) and decarbonization tower (8) top tube coupling, header tank (13) with in proper order with booster pump (5), mix bed filter (3) and resin purification bed (4) top tube coupling.
5. The spent fuel pool sterilization device according to claim 4, wherein the water distribution device (10) comprises a porous 304 stainless steel flat plate and multi-surface hollow plastic balls, the multi-surface hollow plastic balls are mounted on the porous 304 stainless steel flat plate, and water at the bottom of the spent fuel pool (1) is sent to the top of the decarburization tower (8) through the water distribution device (10) to form small annular trickles.
6. The spent fuel pool sterilizing device according to claim 4, wherein the air distribution device (11) is a fishbone type 304 stainless steel perforated pipe.
7. The spent fuel pool sterilizing device according to claim 4, wherein the ultraviolet device (9) comprises a plurality of groups of ultraviolet lamp tube assemblies (14), each group of ultraviolet lamp tube assemblies (14) is formed by connecting four ultraviolet lamp tubes end to form a square, and the ultraviolet lamp tubes are arranged in a mirror reflection manner.
8. The spent fuel pool sterilization device according to claim 4, wherein a control switch (15) of an ultraviolet lamp is arranged outside the decarbonization tower (8), the control switch (15) of the ultraviolet lamp is connected with a control circuit of a spent fuel pool purification loop, and the spent fuel pool purification loop is started and stopped to drive the ultraviolet lamp to start and stop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122685695.XU CN217051910U (en) | 2021-11-04 | 2021-11-04 | Spent fuel pool sterilizing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122685695.XU CN217051910U (en) | 2021-11-04 | 2021-11-04 | Spent fuel pool sterilizing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217051910U true CN217051910U (en) | 2022-07-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122685695.XU Active CN217051910U (en) | 2021-11-04 | 2021-11-04 | Spent fuel pool sterilizing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217051910U (en) |
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2021
- 2021-11-04 CN CN202122685695.XU patent/CN217051910U/en active Active
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