CN209496630U - A kind of passive chemical medicine system applied to nuclear power plant - Google Patents
A kind of passive chemical medicine system applied to nuclear power plant Download PDFInfo
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- CN209496630U CN209496630U CN201920119394.0U CN201920119394U CN209496630U CN 209496630 U CN209496630 U CN 209496630U CN 201920119394 U CN201920119394 U CN 201920119394U CN 209496630 U CN209496630 U CN 209496630U
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- containment
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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Abstract
The utility model provides a kind of passive chemical medicine system applied to nuclear power plant comprising: it is arranged in containment and is located at chemistry addition case and normally closed isolating valve above water tank；The chemistry addition case is connect by pipeline with one end of the normally closed isolating valve, and the other end of the normally closed isolating valve is connect by pipeline with water tank；The normally closed isolating valve is used to open when dose of radiation is exceeded in containment spray system starting and containment.The utility model carries out chemical dosing to water tank using passive injection mode, and dosing method is simple, and equipment and number of tubes are few；It is arranged on the pipeline between chemistry addition case and water tank due to normally closed isolating valve, eliminates the risk of container spray pump cavitation；Just beginning dosing when the chemistry medicine system need to meet exceeded both conditions of dose of radiation in containment spray system starting and containment simultaneously, avoids starting under the not increased accident conditions of radioactive level in containment.
Description
Technical field
The utility model relates to nuclear industry technical fields, and in particular to a kind of passive chemical dosing applied to nuclear power plant
System.
Background technique
Important safety barrier of the containment as nuclear power plant, can protect reactor from the harm of external event；Accident
Last one of the barrier contained afterwards as nuclear reactor radioactivity, can protect environment and the public from excess radiation.Work as reactor
After loss of-coolant accident (LOCA) or main steam pipe break accident occurs, in a large amount of Mass and energy release to containment, cause containment temperature and pressure
Power increases rapidly, while the radioactive level in containment also increases rapidly.To prevent containment over-temp and over-pressure, it is necessary in time will
Containment heat derives, while reducing the radioactive level in containment.
Containment spray system is the important engineered safety system in pressurized-water reactor nuclear power plant, and function is: in accident conditions
Under, when the pressure and temperature in containment is increased to certain value, the pressure and temperature in containment is reduced to acceptable
Level, to keep the integrality of containment.Meanwhile by chemical medicine system, the pH value of spray liquid is adjusted, and then reduce safety
Airborne radioactivity in shell is horizontal.
In existing chemical dosing method, need through the injector on bypass line that containment spray pump is arranged in
Solution in chemical dosing tank is transmitted at a distance, is then mixed with spray liquid, to adjust the pH value of spray liquid.Due to peace
Full shell spray pump runing time is longer, and the process of chemical dosing probably only maintains half an hour, after dosing, if dosing
Isolating valve on pipeline fails to close in time, then containment spray pump has the risk of cavitation erosion；Simultaneously as sodium hydroxide solution
Alkalinity is very strong, and the initial stage, mixed spray solution alkalinity was stronger, corrodes to equipment more serious；In addition, in existing power station
In the Experience Feedback of operation, when LOCA (Lost of coolant accident, loss of-coolant accident (LOCA)) occurs in containment, safety
Shell spray system also will start, while start chemical medicine system, but the radioactive level in shell is there is no increasing at this time, therefore
Without carrying out dosing, however existing dosing method is unable to satisfy this requirement；Meanwhile pipe arrangement is superfluous in existing dosing method
Long, equipment is excessive, complicated for operation.
Utility model content
The utility model is completed in order at least partly solve the technical problems existing in the prior art.
Solving technical solution used by the utility model technical problem is:
The utility model provides a kind of passive chemical medicine system applied to nuclear power plant comprising: it is arranged in safety
In shell and it is located at chemical addition case and normally closed isolating valve above water tank；It is described chemistry addition case by pipeline and it is described it is normally closed every
One end connection from valve, the other end of the normally closed isolating valve are connect by pipeline with water tank；The normally closed isolating valve is used for
It is opened when dose of radiation is exceeded in containment spray system starting and containment.
Optionally, the chemical medicine system further include: controller；The controller is electrically connected with the normally closed isolating valve
It connects, for keeping the normally closed isolating valve to be in close state during normal operation in power station, and in containment spray system
When dose of radiation is exceeded in starting and containment, controls the normally closed isolating valve and open.
Optionally, the chemical medicine system further include: mixing pump；The entrance and exit of the mixing pump passes through pipe respectively
Road is connect with the chemistry addition case.
Optionally, the entrance of the mixing pump is connect by pipeline with the bottom of the chemistry addition case, the mixing pump
Outlet by pipeline with it is described chemistry add case top connect.
Optionally, the controller is also electrically connected with the mixing pump, described in starting during normal operation in power station
Mixing pump, and when dose of radiation is exceeded in containment spray system starting and containment, controls the mixing pump and stop fortune
Turn.
Optionally, the controller is specifically used for, and in power station, every preset time period starting during normal operation is described mixed
Close pump.
Optionally, the normally closed isolating valve uses two, and the two normally closed isolating valves are in parallel.
Optionally, the other end of each normally closed isolating valve passes through individual pipeline respectively and connect with water tank.
Optionally, acid solution is accommodated in the water tank, accommodates alkaline solution in the chemistry addition case.
Optionally, boric acid solution is accommodated in the water tank, accommodates sodium hydroxide solution in the chemistry addition case.
The utility model has the advantages that
The utility model solves the problems, such as containment spray system existing defects in the prior art, passes through simple system
Process, while the mode of passive gravity water filling is increased, the realizability of system function is substantially increased, and reduce equipment
The risk of damage.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of passive chemical medicine system provided by the embodiment of the utility model.
In figure: 1- chemistry adds case；2- mixing pump；3,5,8,9- pipeline；The normally closed isolating valve of 4-；6- water tank；7-
Containment；The outer isolating valve of 10- containment；11- containment spray pump.
Specific embodiment
To make those skilled in the art more fully understand the technical solution of the utility model, with reference to the accompanying drawings and examples
The utility model is described in further detail.
As shown in Figure 1, the utility model embodiment provides a kind of passive chemical medicine system applied to nuclear power plant,
It include: that the chemistry addition case 1 for being arranged in containment 7 and being located at 6 top of water tank and normally closed isolating valve 4, normally closed isolating valve 4 are located at
1 lower section of chemistry addition case；Chemistry addition case 1 is connect by pipeline 8 with one end of normally closed isolating valve 4, normally closed isolating valve 4 it is another
End is connect by pipeline 5 with water tank 6；Normally closed isolating valve 4 is used for the dose of radiation in containment spray system starting and containment
It is opened when exceeded.
Wherein, acid solution is accommodated in water tank 6；Alkaline solution is accommodated in chemistry addition case 1.More preferably, in water tank 6
Accommodate boric acid solution；Chemistry addition case 1 in accommodate sodium hydroxide solution (NaOH solution), generally use mass fraction for
30% sodium hydroxide solution.
Certainly, water tank 6 should also by pipeline successively with outside containment isolating valve 10 and containment spray pump 11 connect, and
Containment spray pump 11 also connect (not shown) with the spraying ring pipe at dome in containment by pipeline.
In the present embodiment, chemistry addition case 1 and pipeline 8, normally closed isolating valve 4 and pipeline 5 complete chemical dosing process jointly,
Specifically, normally closed isolating valve 4, chemistry addition case are opened when dose of radiation is exceeded in containment spray system starting and containment
Solution in 1 passes sequentially through pipeline 8, normally closed isolating valve 4 and the injection water tank of pipeline 5 under gravity (sodium hydroxide solution)
In 6, with the pH value of solution in regulating tank 6, to adjusting the pH value of the spray liquid of containment spray system to alkaline range
It is interior, i.e., chemical dosing is carried out to water tank using passive injection mode, dosing method is simple, and equipment and number of tubes are few.In addition,
It is arranged on the pipeline between chemistry addition case 1 and water tank 6 due to normally closed isolating valve 4, rather than is arranged in containment spray pump 11
Bypass line on, eliminate the risk of container spray pump cavitation.Moreover, the chemistry medicine system need to meet safety simultaneously
Just beginning dosing when dose of radiation exceeded both conditions, avoids radiating in containment in the starting of shell spray system and containment
Property the not increased accident conditions of level under when LOCA accident (in such as containment occur) starting.
Further, the chemical medicine system further include: controller (not shown).Controller and normally closed isolating valve
4 electrical connections, for keeping normally closed isolating valve 4 to be in close state during normal operation in power station, and in container spray system
When dose of radiation is exceeded in system starting and containment, controls normally closed isolating valve 4 and open.
In the present embodiment, normally closed isolating valve 4 is carried out automatically controlling by controller, so that normally closed isolating valve 4 is in electricity
It stands and is in close state always during normal operation, prevent the solution in chemistry addition case 1 from entering in water tank 6；Normally closed isolating valve 4
It is opened when radioactive level is higher in containment spray system starting and containment, so that the solution in chemistry addition case 1
It is injected in water tank 6 by pipeline 8, normally closed isolating valve 4 and pipeline 5 under gravity, with the pH of solution in regulating tank 6
Value, and then the pH value of the spray liquid of containment spray system is adjusted, equipment in acid spray corrosion containment is prevented, and reduce
Radioactive level after accident in containment.
In the present embodiment, normally closed isolating valve 4 can be used two, and the two normally closed isolating valves 4 are in parallel, to avoid using single
When a normally closed isolating valve, entire medicine system is caused to be unable to operate normally due to valve damage.
Further, the other end of each normally closed isolating valve 4 passes through individual pipeline respectively and connect with water tank 6, to pass through
Two tubulation roads are set and increase system redundancy, guarantee the integrality of system function.
As shown in Figure 1, the chemistry medicine system further include: mixing pump 2；2 entrance and exits of mixing pump pass through respectively
Pipeline is connect with chemistry addition case 1.
Specifically, the entrance of mixing pump 2 is connect by pipeline 3 with the bottom of chemistry addition case 1, and the outlet of mixing pump 2 is logical
Piping 9 is connect with the top of chemistry addition case 1.
Containment spray system is the engineered safety system coping with nuclear power station design basis accident and designing, normal in power station
During operation, containment spray system will not be acted, and design basis accident occur within the entire nuclear power station cycle of operation it is general
Rate very little, thus chemistry addition case in solution will be long-term standing without the use of.Due to the hydroxide in chemistry addition case
Sodium solution concentration is higher, can crystallize during long-term stand, and then is deposited in chemistry addition bottom portion, and blocking pipeline goes out
Mouthful.In order to solve this problem, in the present embodiment, chemistry addition case 1, pipeline 3, mixing pump 2 and pipeline 9 are sequentially connected, altogether
With chemical addition agent stirring loop is constituted, solution crystallization in chemistry addition case is prevented.By the swabbing action of mixing pump 2, will change
The solution learned in addition case 1 is extracted out by pipeline 3, returns to chemistry addition case 1 via pipeline 9, realizes solution in chemistry addition case
Solution (sodium hydroxide solution) crystallization in chemistry addition case in the During Process of Long-term Operation of power station can be effectively prevented in stirring.
Controller is also electrically connected with mixing pump 2, for starting mixing pump 2 during normal operation in power station, and in safety
When dose of radiation is exceeded in the starting of shell spray system and containment, control mixing pump 2 shuts down.
In the present embodiment, mixing pump 2 is carried out automatically controlling by controller, makes describedization during normal operation in power station
The operating of additive stirring loop is learned, and when dose of radiation is exceeded in containment spray system starting and containment, making immediately
Additive stirring loop is learned to shut down, in order to avoid influence to water tank dosing.
It is possible to further be set as starting mixing pump 2 at regular intervals.Specifically, controller is also used to, in power station
Every preset time period starts mixing pump 2 during normal operation.It can be fixed according to the substantially crystallization time of solution in chemistry addition case
Phase starts mixing pump, the solution in chemistry addition case to be mixed by circulation line, prevents solution from crystallizing.As for
The specific value of the preset time period can be set according to the actual situation by those skilled in the art.
Under accident conditions, for example, after main steam pipe break accident occurs for reactor, a large amount of Mass and energy release to safety
In shell, containment temperature and pressure is caused to increase rapidly, while the radioactive substance level in containment rises rapidly.To prevent
Containment over-temp and over-pressure, reduces the radioactive level in containment, and containment spray pump is being connected to containment high temp/high pressure signal
Afterwards, start spray function immediately, the mixing pump 2 in chemical medicine system shuts down immediately at this time, while two normally closed isolation
Valve 4 automatically opens when radioactive level is higher in containment spray system starting and containment, then the hydrogen in chemistry addition case 1
Sodium hydroxide solution is flowed by gravity in water tank 6 below, is mixed with the boric acid solution in water tank 6, then via containment
Spray pump 11 sprays mixed solution from 7 dome of containment, the temperature and pressure after reduction accident in containment with
And the radioactive substance in containment is horizontal.
As it can be seen that both sides function may be implemented in the chemistry medicine system, on the one hand, form chemical addition agent and stir back
Road is to prevent solution crystallization in chemistry addition case；On the other hand, the pH value of the spray liquid of containment spray system is adjusted.
In conclusion after nuclear power plant is using above-mentioned passive chemical medicine system, under accident conditions, when in containment
Pressure and temperature when being increased to certain value, containment spray system brings into operation, if dose of radiation is exceeded in containment at this time,
Then mixing pump 2 shuts down immediately, while normally closed isolating valve 4 is opened, and the sodium hydroxide solution in chemistry addition case 1 relies on itself
Gravity mixes with the solution in water tank 6 followed by being directly entered in water tank 6 after pipeline 8 and pipeline 5, then passes through containment
Spray pump sprays mixed solution from containment dome, to realize containment spray system function, and adjusts safety
The pH value of the spray liquid of shell spray system prevents equipment in acid spray corrosion containment, and after reduction accident in containment
Radioactive level, to increase the safety and availability of containment spray system；It can also be for different in containment
Temperature, pressure rise accident conditions different spray modes are provided, to guarantee system function, for example, the radioactivity in containment
Under horizontal not increased accident conditions (when LOCA accident occurring in such as containment), only start containment spray system, and
When meeting exceeded both conditions of dose of radiation in containment spray system starting and containment simultaneously, just starting chemistry dosing system
System.
Therefore, the dosing method of the passive chemical medicine system is easy to operate, reduces a large amount of pipeline and sets
It is standby, the economy of the system is improved, function is more reliable and more stable, while can also avoid because of containment spray system error starting
Bring loss and the corrosion to equipment, eliminate the risk of container spray pump cavitation.
It is understood that embodiment of above is merely to illustrate that the principles of the present invention and uses exemplary
Embodiment, however the utility model is not limited thereto.For those skilled in the art, this is not being departed from
In the case where the spirit and essence of utility model, various changes and modifications can be made therein, these variations and modifications are also considered as this reality
With novel protection scope.
Claims (10)
1. a kind of passive chemical medicine system applied to nuclear power plant characterized by comprising be arranged in containment and position
Chemistry addition case and normally closed isolating valve above water tank；The chemistry addition case passes through pipeline and the one of the normally closed isolating valve
The other end of end connection, the normally closed isolating valve is connect by pipeline with water tank；The normally closed isolating valve is used to spray in containment
It is opened when dose of radiation is exceeded in the starting of leaching system and containment.
2. chemistry medicine system according to claim 1, which is characterized in that further include: controller；The controller and institute
The electrical connection of normally closed isolating valve is stated, for keeping the normally closed isolating valve to be in close state during normal operation in power station, and
When dose of radiation is exceeded in containment spray system starting and containment, controls the normally closed isolating valve and open.
3. chemistry medicine system according to claim 2, which is characterized in that further include: mixing pump；The mixing pump enters
Mouth and outlet are connect by pipeline with the chemistry addition case respectively.
4. chemistry medicine system according to claim 3, which is characterized in that the entrance of the mixing pump passes through pipeline and institute
The bottom connection of chemistry addition case is stated, the outlet of the mixing pump is connect by pipeline with the top of the chemistry addition case.
5. chemistry medicine system according to claim 3, which is characterized in that the controller is also electrically connected with the mixing pump
It connects, for starting the mixing pump, and the spoke in containment spray system starting and containment during normal operation in power station
Penetrate dosage it is exceeded when, control the mixing pump and shut down.
6. it is according to claim 5 chemistry medicine system, which is characterized in that the controller is specifically used for, power station just
Often every preset time period starts the mixing pump during operation.
7. chemistry medicine system according to claim 1 to 6, which is characterized in that the normally closed isolating valve uses
Two, and the two normally closed isolating valves are in parallel.
8. chemistry medicine system according to claim 7, which is characterized in that the other end of each normally closed isolating valve point
Not Tong Guo individual pipeline connect with water tank.
9. chemistry medicine system according to claim 1 to 6, which is characterized in that accommodate acid in the water tank
Property solution, it is described chemistry addition case in accommodates alkaline solution.
10. chemistry medicine system according to claim 9, which is characterized in that accommodate boric acid solution, institute in the water tank
It states in chemistry addition case and accommodates sodium hydroxide solution.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920119394.0U CN209496630U (en) | 2019-01-23 | 2019-01-23 | A kind of passive chemical medicine system applied to nuclear power plant |
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| CN201920119394.0U CN209496630U (en) | 2019-01-23 | 2019-01-23 | A kind of passive chemical medicine system applied to nuclear power plant |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113488215A (en) * | 2021-07-22 | 2021-10-08 | 华能山东石岛湾核电有限公司 | Chemical dosing system and dosing control method for high-temperature gas cooled reactor passive system |
| CN113707347A (en) * | 2021-07-12 | 2021-11-26 | 中国核电工程有限公司 | Method for preventing mistaken dosing of nuclear power plant containment spraying system and judgment module |
-
2019
- 2019-01-23 CN CN201920119394.0U patent/CN209496630U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113707347A (en) * | 2021-07-12 | 2021-11-26 | 中国核电工程有限公司 | Method for preventing mistaken dosing of nuclear power plant containment spraying system and judgment module |
| CN113488215A (en) * | 2021-07-22 | 2021-10-08 | 华能山东石岛湾核电有限公司 | Chemical dosing system and dosing control method for high-temperature gas cooled reactor passive system |
| CN113488215B (en) * | 2021-07-22 | 2023-10-17 | 华能山东石岛湾核电有限公司 | Chemical dosing system of high-temperature gas cooled reactor passive system and dosing control method |
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