CN113488215B - Chemical dosing system of high-temperature gas cooled reactor passive system and dosing control method - Google Patents
Chemical dosing system of high-temperature gas cooled reactor passive system and dosing control method Download PDFInfo
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- CN113488215B CN113488215B CN202110832755.8A CN202110832755A CN113488215B CN 113488215 B CN113488215 B CN 113488215B CN 202110832755 A CN202110832755 A CN 202110832755A CN 113488215 B CN113488215 B CN 113488215B
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- water
- valve
- water supplementing
- tank
- corrosion inhibitor
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C15/00—Cooling arrangements within the pressure vessel containing the core; Selection of specific coolants
- G21C15/18—Emergency cooling arrangements; Removing shut-down heat
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C15/00—Cooling arrangements within the pressure vessel containing the core; Selection of specific coolants
- G21C15/02—Arrangements or disposition of passages in which heat is transferred to the coolant; Coolant flow control devices
-
- 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
Abstract
A chemical dosing system of a high-temperature gas cooled reactor passive system and a dosing control method thereof are provided, wherein a waste heat discharging system reflux pipe is arranged behind a mother pipe valve at an outlet of a water supplementing pump and is led to an inlet valve of the water supplementing pump, and a reflux valve is arranged on the reflux pipe at the same time; the water in the waste heat discharging system is pumped back to the water supplementing tank through pipeline switching; adding the corrosion inhibitor and alkalization with required amounts into a water supplementing tank directly, supplementing water and preparing a solution; the solution is uniformly mixed through a recirculation valve; and the water supplementing and chemical adding are carried out on the loops of the passive residual heat removal systems one by one, so that the operation of the system is not influenced. The invention can uniformly mix the solution medicaments entering the passive system, avoid concentration gradient and local concentration under natural circulation, and slow down the corrosion of system equipment.
Description
Technical Field
The invention relates to the technical field of high-temperature gas cooled reactor nuclear power water chemistry, in particular to a chemical dosing system and a chemical dosing control method of a high-temperature gas cooled reactor nuclear power passive system.
Background
The nuclear power of the high-temperature gas cooled reactor is provided with an passive waste heat discharging system which is used for cooling a reactor cabin and discharging the waste heat of the reactor under the accident condition, the system is an passive system, A, B, C is provided with three independent loops, a medium is desalted water, and corrosion inhibitors and alkalizing agents are added to reduce the corrosion of system equipment. The system is characterized in that a water supplementing tank of a cooling water system of the equipment is used for supplementing water, the water supplementing tank is arranged at the lowest horizontal position of a factory building, and a corrosion inhibitor and an alkalizing agent which are needed are added to a water supplementing pipe through a dosing metering pump during water supplementing, so that the water enters the system along with water supplementing.
Because the system is an passive system, the chemical agents added into the system are supplemented without a circulating pump to be circularly and evenly mixed, and the chemical agents can be evenly mixed only by natural circulation of the system, so that the concentrations of the chemical agents at different positions in the system are different, concentration gradients exist, and electrochemical corrosion is caused. The presence of a concentration gradient can also cause localized concentration of the medium, causing corrosion of the system equipment.
Disclosure of Invention
The invention aims to provide a chemical dosing control method for a nuclear power passive system of a high-temperature gas cooled reactor, which solves the problem of uneven mixing of chemical agents in the system and slows down corrosion of system equipment.
To achieve the purpose, the invention adopts the following technical scheme:
a high temperature gas cooled reactor passive system chemical dosing system, comprising:
the upper portion of the water supplementing tank is provided with a water inlet valve, the bottom of the water supplementing tank is provided with a water supplementing pump inlet valve, the other end of the water supplementing pump inlet valve is connected with an outlet parent pipe valve and a water supplementing tank recirculation valve at the same time after passing through the water supplementing pump, the outlet parent pipe valve is respectively connected with a plurality of rows of independent loops for supplementing water, the inlet of each row of loops is provided with a row of water inlet valves, a waste heat discharging system reflux pipe is arranged between the outlet parent pipe valve and the row of water inlet valves, the waste heat discharging system reflux valve is arranged on the waste heat discharging system reflux pipe after leading to the water supplementing pump inlet valve, the other end of the water supplementing tank recirculation valve is connected with the inlet end of the water inlet valve, and a medicine adding box outlet valve and a medicine adding box are sequentially connected between the water supplementing tank recirculation valve and the water inlet valve.
Optionally, a water replenishing tank sampling valve is further arranged between the water replenishing tank and the water replenishing pump inlet valve so as to sample and monitor the concentration of the corrosion inhibitor in the water and the pH value of the water.
The invention further discloses a method for controlling the chemical dosing by using the chemical dosing system of the high-temperature gas cooled reactor passive system, which is characterized by comprising the following steps:
(1) Closing a water supplementing pump inlet valve and an outlet main pipe valve, opening a water supplementing tank recirculation valve, a water inlet valve and a waste heat discharging system recirculation valve, then opening a water inlet valve of an independent loop required to be added with medicine, starting a water supplementing pump, pumping the waste heat discharging system loop water of the independent loop back to the water supplementing tank, stopping the water supplementing pump, and closing the waste heat discharging system recirculation valve and the water supplementing tank recirculation valve;
(2) Sampling and monitoring the concentration of the corrosion inhibitor in water and the pH value of the water through a water supplementing tank sampling valve, and calculating the corrosion inhibitor and the alkalizing agent which are needed to be newly added according to the monitoring result and the water supplementing amount;
(3) Adding the corrosion inhibitor and the alkalizing agent with required amounts into a water supplementing tank through a dosing tank, and adding desalted water to prepare a solution with a corrosion inhibitor concentration target value and a pH target value;
(4) Opening a water supplementing tank recirculation valve and a water supplementing pump inlet valve, starting a water supplementing pump, circularly stirring the solution in the water supplementing tank for 30 minutes, stopping the water supplementing pump after uniformly mixing, and closing the water supplementing tank recirculation valve;
(5) Sampling and monitoring the concentration of the corrosion inhibitor in water and the pH value of the water through a water supplementing tank sampling valve, and judging whether the target value of the concentration of the corrosion inhibitor and the target value of the pH value are reached;
(6) Opening a main pipe valve at an outlet of the water supplementing pump, starting the water supplementing pump, conveying the solution of the water supplementing tank to the independent loop needing adding the medicine, stopping the water supplementing pump, and closing a water inlet valve of the independent loop;
(7) And (3) sequentially performing chemical water supplementing and chemical adding operations of the residual heat removal system loops of the other independent loops according to the steps (1) - (6).
Optionally, steps (2) to (5) are performed multiple times until the corrosion inhibitor concentration and the pH value of the sampled and monitored water in step (5) reach target values.
Optionally, the target value of the corrosion inhibitor concentration is 2.5g/L, and the target value of the pH value is 10.5.
Optionally, the concentration of the chemical corrosion inhibitor in the water and the pH value of the water in each row of waste heat removal systems are periodically monitored to determine whether chemical dosing control is needed again.
Therefore, by using the chemical dosing system of the high-temperature gas cooled reactor passive system and the dosing control method thereof, the solution medicaments entering the passive system can be uniformly mixed, concentration gradient and local concentration are avoided under natural circulation, and corrosion of system equipment is slowed down.
Drawings
FIG. 1 is a schematic structural view of a chemical dosing system of a high temperature gas cooled reactor passive system according to an embodiment of the invention.
The technical features indicated by the reference numerals in the drawings are as follows:
1. a water inlet valve; 2. a water supplementing tank; 3. an inlet valve of the water supplementing pump; 4. a water supplementing pump; 5. a waste heat discharging system reflux valve; 6. a is a water inlet valve; 7. an outlet parent pipe valve; 8. a make-up tank recirculation valve; 9. an outlet valve of the dosing tank; 10. a dosing box; 11. a water supplementing tank sampling valve.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
The invention mainly comprises the following steps: a waste heat discharging system reflux pipe is arranged behind a main pipe valve at the outlet of the water supplementing pump, and a reflux valve is arranged on the reflux pipe after the waste heat discharging system reflux pipe is led to an inlet valve of the water supplementing pump; the water in the waste heat discharging system is pumped back to the water supplementing tank through pipeline switching; adding the corrosion inhibitor and alkalization with required amounts into a water supplementing tank directly, supplementing water and preparing a solution; the solution is uniformly mixed through a recirculation valve; and the water and the medicine are supplemented one by one to the three passive waste heat discharging system loops of A, B, C, so that the operation of the system is not influenced.
Referring to fig. 1, a schematic structural diagram of a chemical dosing system of a high temperature gas cooled reactor passive system according to an embodiment of the present invention is shown.
A high temperature gas cooled reactor passive system chemical dosing system comprising:
the water replenishing tank 2 is provided with a water inlet valve 1 at the upper part of the water replenishing tank 2, a water replenishing pump inlet valve 3 is arranged at the bottom of the water replenishing tank 2, the other end of the water replenishing pump inlet valve 3 is connected with an outlet parent pipe valve 7 and a water replenishing tank recirculation valve 8 simultaneously after passing through a water replenishing pump 4, the outlet parent pipe valve 7 is respectively connected with three A, B, C independent circuits for water replenishing, a column water inlet valve, such as a column water inlet valve 6 is arranged at the inlet of each circuit, a heat discharge system backflow pipe is arranged between the outlet parent pipe valve 7 and the column water inlet valve and is connected with the water replenishing pump 4 after being led to the water replenishing pump inlet valve 3, a waste heat discharge system backflow valve 5 is arranged on the heat discharge system backflow pipe, the other end of the water replenishing tank recirculation valve 8 is connected with the inlet end of the water inlet valve 1, and a medicine adding tank outlet valve 9 and a medicine adding tank 10 are sequentially connected between the water replenishing tank recirculation valve 8 and the water inlet valve 1.
Further, a water replenishing tank sampling valve 11 is arranged between the water replenishing tank 2 and the water replenishing pump inlet valve 3 so as to sample and monitor the concentration of the corrosion inhibitor in water and the pH value of the water.
The invention further discloses a dosing control method of the chemical dosing system by utilizing the high-temperature gas cooled reactor passive system, which comprises the following steps:
(1) Closing the inlet valve 3 and the outlet main pipe valve 7 of the water replenishing pump, opening the water replenishing tank recirculation valve 8, the water inlet valve 1 and the waste heat discharging system reflux valve 5, then opening the water inlet valves of the independent circuits needing to be added, namely, one row of water inlet valves in the A-C row, such as the A-row water inlet valve 6, taking the A row as an example, starting the water replenishing pump 4, pumping the waste heat discharging system loop water of the A-row independent circuits back to the water replenishing tank 2, stopping the water replenishing pump 4, and closing the waste heat discharging system reflux valve 5 and the water replenishing tank recirculation valve 8;
(2) Sampling and monitoring the concentration of the corrosion inhibitor in water and the pH value of the water through a water supplementing tank sampling valve 11, and calculating the amount of the corrosion inhibitor and the alkalizing agent (potassium hydroxide) which are required to be newly added into the system according to the monitoring result and the water supplementing amount, wherein the adding concentration of the corrosion inhibitor of the system is 2.5g/L;
(3) Adding a corrosion inhibitor and an alkalizing agent with required amounts into a water supplementing tank 2 through a dosing tank 10, and adding desalted water to prepare a solution with the concentration of the corrosion inhibitor of 2.5g/L, pH of about 10.5, wherein the liquid level of the water supplementing tank 2 is 1.4m;
(4) Opening a water supplementing tank recirculation valve 8 and a water supplementing pump inlet valve 3, starting a water supplementing pump 4, circularly stirring the solution in the water supplementing tank 2 for 30 minutes, stopping the water supplementing pump 4 after uniformly mixing, and closing the water supplementing tank recirculation valve 8;
(5) Sampling and monitoring the concentration of the corrosion inhibitor in water and the pH value of the water through a water supplementing tank sampling valve 11, wherein the target value of the concentration of the corrosion inhibitor is about 10.5 g/L, pH target value;
(6) Opening a main pipe valve 7 at the outlet of the water supplementing pump, starting the water supplementing pump 4, conveying the solution of the water supplementing tank 2 to the row A passive waste heat discharging system, stopping the water supplementing pump, and closing the row A water inlet valve 6;
(7) And (3) sequentially performing chemical water supplementing and chemical adding operations of the rest B, C passive waste heat discharging system loops according to the steps (1) - (6).
Further, in order to further improve the accuracy of the corrosion inhibitor concentration and the pH value of the water, the steps (2) to (5) are carried out for a plurality of times until the concentration of the corrosion inhibitor in the water and the pH value of the water are sampled and monitored in the step (5) to reach target values.
Furthermore, the invention also periodically monitors the concentration of the chemical corrosion inhibitor in the water of the A, B, C passive waste heat discharging system and the pH value of the water so as to judge whether the dosing control needs to be carried out again.
Therefore, by using the chemical dosing system of the high-temperature gas cooled reactor passive system and the dosing control method thereof, the solution medicaments entering the passive system can be uniformly mixed, concentration gradient and local concentration are avoided under natural circulation, and corrosion of system equipment is slowed down.
It is to be understood that the above embodiments are merely illustrative of the application of the principles of the present invention, but not in limitation thereof. Various modifications and improvements may be made by those skilled in the art without departing from the spirit and substance of the invention, and are also considered to be within the scope of the invention.
Claims (6)
1. A high temperature gas cooled reactor passive system chemical dosing system, comprising:
the upper portion of the water supplementing tank is provided with a water inlet valve, the bottom of the water supplementing tank is provided with a water supplementing pump inlet valve, the other end of the water supplementing pump inlet valve is connected with an outlet parent pipe valve and a water supplementing tank recirculation valve at the same time after passing through the water supplementing pump, the outlet parent pipe valve is respectively connected with a plurality of rows of independent loops for supplementing water, the inlet of each row of loops is provided with a row of water inlet valves, a waste heat discharging system reflux pipe is arranged between the outlet parent pipe valve and the row of water inlet valves, the waste heat discharging system reflux valve is arranged on the waste heat discharging system reflux pipe after leading to the water supplementing pump inlet valve, the other end of the water supplementing tank recirculation valve is connected with the inlet end of the water inlet valve, and a medicine adding box outlet valve and a medicine adding box are sequentially connected between the water supplementing tank recirculation valve and the water inlet valve.
2. The chemical dosing system according to claim 1, wherein:
and a water replenishing tank sampling valve is arranged between the water replenishing tank and the water replenishing pump inlet valve so as to sample and monitor the concentration of the corrosion inhibitor in the water and the pH value of the water.
3. A method for dosing control using the passive system chemical dosing system of a high temperature gas cooled reactor as claimed in claim 1 or 2, comprising the steps of:
(1) Closing a water supplementing pump inlet valve and an outlet main pipe valve, opening a water supplementing tank recirculation valve, a water inlet valve and a waste heat discharging system recirculation valve, then opening a water inlet valve of an independent loop required to be added with medicine, starting a water supplementing pump, pumping the waste heat discharging system loop water of the independent loop back to the water supplementing tank, stopping the water supplementing pump, and closing the waste heat discharging system recirculation valve and the water supplementing tank recirculation valve;
(2) Sampling and monitoring the concentration of the corrosion inhibitor in water and the pH value of the water through a water supplementing tank sampling valve, and calculating the corrosion inhibitor and the alkalizing agent which are needed to be newly added according to the monitoring result and the water supplementing amount;
(3) Adding the corrosion inhibitor and the alkalizing agent with required amounts into a water supplementing tank through a dosing tank, and adding desalted water to prepare a solution with a corrosion inhibitor concentration target value and a pH target value;
(4) Opening a water supplementing tank recirculation valve and a water supplementing pump inlet valve, starting a water supplementing pump, circularly stirring the solution in the water supplementing tank for 30 minutes, stopping the water supplementing pump after uniformly mixing, and closing the water supplementing tank recirculation valve;
(5) Sampling and monitoring the concentration of the corrosion inhibitor in water and the pH value of the water through a water supplementing tank sampling valve, and judging whether the target value of the concentration of the corrosion inhibitor and the target value of the pH value are reached;
(6) Opening a main pipe valve at an outlet of the water supplementing pump, starting the water supplementing pump, conveying the solution of the water supplementing tank to the independent loop needing adding the medicine, stopping the water supplementing pump, and closing a water inlet valve of the independent loop;
(7) And (3) sequentially performing chemical water supplementing and chemical adding operations of the residual heat removal system loops of the other independent loops according to the steps (1) - (6).
4. A method of dosing control according to claim 3, wherein:
and (3) performing the steps (2) to (5) for a plurality of times until the concentration of the corrosion inhibitor and the pH value of the sampling monitoring water in the step (5) reach target values.
5. The method of dosing control of claim 4, wherein:
the target value of the corrosion inhibitor concentration is 2.5g/L, and the target value of the pH value is 10.5.
6. The method of dosing control of claim 4, wherein:
the concentration of chemical corrosion inhibitor in the water and the pH value of the water in each row of waste heat discharging system are monitored regularly to judge whether chemical adding control is needed again.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110832755.8A CN113488215B (en) | 2021-07-22 | 2021-07-22 | Chemical dosing system of high-temperature gas cooled reactor passive system and dosing control method |
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| CN202110832755.8A CN113488215B (en) | 2021-07-22 | 2021-07-22 | Chemical dosing system of high-temperature gas cooled reactor passive system and dosing control method |
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| CN113488215B true CN113488215B (en) | 2023-10-17 |
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