CN111584103B - Continuous spraying adjusting method for voltage stabilizer of nuclear power station - Google Patents
Continuous spraying adjusting method for voltage stabilizer of nuclear power station Download PDFInfo
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- CN111584103B CN111584103B CN202010335174.9A CN202010335174A CN111584103B CN 111584103 B CN111584103 B CN 111584103B CN 202010335174 A CN202010335174 A CN 202010335174A CN 111584103 B CN111584103 B CN 111584103B
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C17/00—Monitoring; Testing ; Maintaining
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
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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 invention belongs to the technical field of a loop voltage stabilizer of a nuclear power station, and particularly relates to a continuous spraying adjusting method of the voltage stabilizer of the nuclear power station, which comprises the following steps: in the process of starting a pressurized water reactor from cold shutdown to hot shutdown, limiting the minimum opening of a spray valve to a first opening, wherein when the spray valve is at the first opening, the temperature of a water outlet end of a spray pipeline is lower than that of a water inlet end connected with a water inlet end of a cold end of a primary circuit, and the temperature difference between the water outlet end and the water inlet end is less than 12 ℃; and when the pressurized water reactor is in a hot shutdown state, the spray valve is adjusted to the optimal continuous spray opening. The continuous spraying adjusting method for the nuclear power station voltage stabilizer reduces adjusting time required by continuous spraying adjustment of the voltage stabilizer, and if the boron content of cooling water in a loop is adjusted in the process from cold shutdown to hot shutdown, the boron content of the cooling water in the voltage stabilizer is still consistent with that of the cooling water in the loop.
Description
Technical Field
The invention belongs to the technical field of a loop voltage stabilizer of a nuclear power station, and particularly relates to a continuous spraying adjusting method of the voltage stabilizer of the nuclear power station.
Background
Continuous spraying of the voltage stabilizer is very important for pressure control of the voltage stabilizer, but the continuous spraying position is not directly preset properly, and a nuclear power plant debugging worker needs to verify the continuous spraying position on the spot according to a certain method to find out the optimal continuous spraying position.
Existing regulation settings for continuous spray of manostats are at the time node, usually after the pressure stack reaches a hot shutdown. In the process from cold shutdown to hot shutdown, because the spray valve has not yet the optimal continuous spray opening, the spray valve may be closed or have a smaller opening in the automatic adjustment mode, which results in no or less cooling water flowing through the spray line, i.e., the cooling water is limited from flowing into the pressurizer through the spray line, which results in the temperature of the spray line being lower than the temperature of the cold end of the primary loop and the temperature difference between the two being larger, therefore, during continuous spray adjustment of the pressurizer, the spray line needs to be heated to be substantially consistent with the temperature of the cold end of the primary loop, the temperature of the spray line is lower than the temperature of the cold end of the primary loop and the temperature difference between the two being larger, the spray line itself needs to absorb more heat, which affects the vapor-liquid state in the pressurizer, therefore, during the adjustment process, the vapor-liquid state in the pressurizer needs to be rebalanced, which affects the efficiency of continuous spray adjustment of the pressurizer, resulting in more adjustment time for continuous spray adjustment of the potentiostat.
In addition, in the process from cold shutdown to hot shutdown, the boron content of the cooling water in the primary loop can be adjusted according to actual conditions, and in the process, because the cooling water in the primary loop and the cooling water in the voltage stabilizer cannot circulate or the circulation amount is small, the boron content of the cooling water in the voltage stabilizer is inconsistent with that of the cooling water in the primary loop, so that in the continuous spraying adjustment process of the voltage stabilizer, much time is needed to be consumed to balance the boron content of the cooling water in the voltage stabilizer and the boron content of the cooling water in the primary loop, and the time needed by the continuous spraying adjustment of the voltage stabilizer is longer.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a continuous spraying adjusting method for a voltage stabilizer of a nuclear power station, which aims to solve the problem that the continuous spraying adjustment of the voltage stabilizer needs more adjusting time.
The invention is realized by the following steps:
a continuous spraying adjusting method for a voltage stabilizer of a nuclear power station comprises the following steps:
in the process of starting a pressurized water reactor from cold shutdown to hot shutdown, limiting the minimum opening of a spray valve to a first opening, wherein when the spray valve is at the first opening, the temperature of a water outlet end of a spray pipeline is lower than that of a water inlet end connected with a water inlet end of a cold end of a primary circuit, and the temperature difference between the water outlet end and the water inlet end is less than 12 ℃;
and when the pressurized water reactor is in a hot shutdown state, the spray valve is adjusted to the optimal continuous spray opening.
Optionally, when the spray valve is at the first opening degree, the temperature difference between the water outlet end and the water inlet end of the spray pipeline is 7.5-8.5 ℃.
Optionally, when the spray valve is at the first opening degree, the temperature difference between the water outlet end and the water inlet end of the spray pipeline is 7.8-8.2 ℃.
Optionally, the spray valve is adjusted to the optimal continuous spray opening degree, and a lower limit stop is provided, wherein the lower limit stop is used for limiting the spray valve to the optimal continuous spray opening degree.
Optionally, the lower limit stopper is detachably connected to the shower valve.
Optionally, the lower limit stop is detachably connected with the spray valve through a threaded structure.
Optionally, the screw structure passes through the lower limit stop and is screw-engaged with the spray valve to fasten the lower limit stop to the spray valve.
Optionally, the lower limit stop is detachably connected with the spray valve through a buckle structure.
Optionally, before limiting the minimum opening of the spray valve to the first opening, the opening of the spray valve is adjusted to a second opening, and then adjusted to the first opening, where the second opening is greater than the first opening.
Optionally, in the process of adjusting from the second opening degree to the first opening degree, the second opening degree is unidirectionally adjusted to the first opening degree.
Based on the fact that the minimum opening degree of the spray valve is limited to a first opening degree in the process from cold shutdown to hot shutdown of the pressurized water reactor, when the spray valve is in the first opening degree, the temperature of the water outlet end of the spray pipeline is lower than that of the water inlet end connected with the cold end of the primary circuit, the temperature difference between the water outlet end and the water inlet end is smaller than 12 ℃, and the temperature difference between the spray pipeline and the cold end of the primary circuit is smaller, so that when the pressurized water reactor is in the hot shutdown and the spray valve is adjusted to the optimal continuous spray opening degree, the heat required to be absorbed by the spray pipeline is reduced, and the influence on the steam-liquid state in the pressurizer is reduced, therefore, in the step S200, the steam-liquid state in the pressurizer can be quickly rebalanced, the spray valve is adjusted to the optimal continuous spray opening degree, and the continuous spray adjustment efficiency of the pressurizer is improved, thereby reducing the adjustment time required for continuous spray adjustment of the pressure stabilizer.
In addition, the minimum opening degree of the spray valve is limited to be a first opening degree based on the fact that the pressurized water reactor is started from cold shutdown to hot shutdown, wherein when the spray valve is in the first opening degree, the temperature of the water outlet end of the spray pipeline is lower than that of the water inlet end connected with the water inlet end of the cold end of the primary loop, the temperature difference between the water outlet end of the spray pipeline and the water inlet end is smaller than 12 ℃, and the spray valve and the water inlet end are in a circulating state all the time.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a flowchart of a method for adjusting continuous spraying of a nuclear power plant voltage stabilizer according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The embodiment of the invention provides a continuous spraying adjustment method for a nuclear power station voltage stabilizer, which has the core thought that the adjustment is started in the process from the cold shutdown to the hot shutdown, and the continuous spraying adjustment of the voltage stabilizer in the process is not needed after a pressure reactor reaches the hot shutdown, so that the normal operation of the pressurized water reactor in the process is not influenced.
Referring to fig. 1, the method for adjusting continuous spraying of a voltage stabilizer in a nuclear power plant includes:
step S100: and in the process of starting the pressurized water reactor from cold shutdown to hot shutdown, limiting the minimum opening of the spray valve to a first opening, wherein when the spray valve is at the first opening, the temperature of the water outlet end of the spray pipeline is lower than that of the water inlet end connected with the cold end of the primary loop, and the temperature difference between the water outlet end and the water inlet end is less than 12 ℃.
In the process of starting a pressurized water reactor from cold shutdown to hot shutdown, cooling water in a loop begins to heat up, a steam cavity is established in a pressure stabilizer, a spray valve is in an automatic regulation state, wherein the minimum opening degree of the spray valve is limited to a first opening degree, and when the spray valve is in the first opening degree, the temperature of the water outlet end of a spray pipeline is lower than that of the water inlet end connected with the water inlet end of the cold end of the loop, and the temperature difference between the water outlet end and the water inlet end is smaller than 12 ℃, so that the spray valve is prevented from being closed or too small in opening degree in the automatic regulation state, and the temperature difference between the spray pipeline and the cold end of the loop is further prevented from being large, so that the temperature difference between the spray pipeline and the cold end of the loop is smaller.
It should be noted that the temperature of the outlet end of the spray line and the temperature of the inlet end connected to the inlet end of the cold end of the primary circuit are obtained by using temperature sensors.
Step S200: and when the pressurized water reactor is in a hot shutdown state, the spray valve is adjusted to the optimal continuous spray opening.
It should be noted that, in the process of adjusting the minimum opening limit of the spray valve from the first opening to the optimal continuous spray opening, the difference is that the initial adjustment opening is different, as in the conventional continuous spray adjustment method for the nuclear power plant voltage stabilizer.
It should be noted that, during the process from the cold shutdown to the hot shutdown of the pressurized water reactor, and when the pressurized water reactor is in the hot shutdown, other structural components of the pressurized water reactor operate as they are when the continuous spray regulation method of the nuclear power plant voltage stabilizer is not adopted, such as the structural size of the voltage stabilizer, the automatic regulation state of the heater, and the like.
Based on the step S100, that is, based on "during the process from the cold shutdown to the hot shutdown of the pressurized water reactor, the minimum opening degree of the spray valve is limited to the first opening degree, wherein when the spray valve is at the first opening degree, the temperature of the water outlet end of the spray pipeline is lower than the temperature of the water inlet end connected to the water inlet end of the cold end of the primary loop, and the temperature difference between the two is less than 12 ℃", and the temperature difference between the spray pipeline and the cold end of the primary loop is smaller, therefore, when the step S200 is reached, that is, when the pressurized water reactor is at the hot shutdown, the spray valve is adjusted to the optimum continuous spray opening degree ", the amount of heat required to be absorbed by the spray pipeline itself is reduced, and the influence on the vapor-liquid state in the pressurizer is reduced, therefore, during the step S200, the vapor-liquid state in the pressurizer can be quickly rebalanced, and the spray valve is adjusted to the optimum continuous spray opening degree, which improves the efficiency of continuous spray adjustment of the pressurizer, thereby reducing the adjustment time required for continuous spray adjustment of the pressure stabilizer.
In addition, based on step S100, that is, based on "during the process from the cold shutdown to the hot shutdown of the pressurized water reactor, the minimum opening of the spray valve is limited to a first opening, wherein when the spray valve is at the first opening, the temperature of the water outlet end of the spray pipeline is lower than the temperature of the water inlet end connected to the cold end of the primary loop, and the temperature difference between the two is less than 12 ℃", and the spray valve is always in a circulating state.
Here, the adjustment time required for the continuous spraying adjustment of the potentiostat means the adjustment operation time required for the continuous spraying of the potentiostat by the worker in the time zone.
It is noted here that, based on the regulation method of the present invention, the regulation time required for the continuous spray regulation of the pressure vessel is reduced from 6 hours to 0.5-1 hour, which significantly reduces the regulation time.
In the embodiment of the invention, when the spray valve is in the first opening degree, the temperature difference between the water outlet end and the water inlet end of the spray pipeline is 7.5-8.5 ℃. I.e., the temperature at the outlet end of the spray line is about 8 c lower than the temperature at the inlet end. In the actual operation process, the temperature of the water outlet end of the spraying pipeline is controlled to be about 8 ℃ lower than that of the water inlet end of the spraying pipeline, the operation power of the heater is less in up-down floating, and the operation stability of the whole pressure reactor is improved.
Specifically, when the spray valve is in the first opening degree, the temperature difference between the water outlet end and the water inlet end of the spray pipeline is 7.8-8.2 ℃.
Here, the temperature difference of about 8 ℃ is a value that the inventors have tested in a plurality of experiments, and the adjustment time required for the continuous shower adjustment of the pressure vessel can be reduced to about 0.5 hour.
Here, the shower valve is usually an electrically controlled valve, and the shower valve is controlled to be maintained at a predetermined opening degree by an internal electrical structure thereof, but the shower valve cannot be maintained at the predetermined opening degree due to an abnormal condition such as current fluctuation in the electrical structure.
In the embodiment of the invention, the spray valve is set to the optimal continuous spray opening degree, and the lower limit stop block is arranged, wherein the lower limit stop block is used for limiting the spray valve to the optimal continuous spray opening degree. The spray valve is limited to the optimal continuous spraying opening degree through the lower limiting stop block outside the spray valve, and the situation that the spray valve cannot be maintained at the preset opening degree due to the abnormal conditions of current fluctuation and the like of an electric structure is avoided.
Specifically, in the embodiment of the invention, the lower limit stop is detachably connected with the spray valve. Therefore, when the lower limiting stop block is connected to other structural parts, the structural parts move, and the readjustment is needed.
Specifically, lower limit stop dog accessible spiro union structure can be dismantled with the spraying valve and be connected, also can dismantle with the spraying valve through buckle structure and be connected, and these two kinds of connection structure all have simple structure, the advantage of easily realizing, favourable reduction manufacturing cost.
Wherein, it can dismantle with the valve that sprays to correspond limit stop down through the spiro union structure and be connected, and the spiro union structure can be the screw to pass limit stop down, and with the cooperation of spraying the valve spiro union, with lower limit stop fasten in the valve that sprays, based on the structure, only need twist the spiro union structure soon and can realize the assembly and dismantle, the staff's of being convenient for operating efficiency.
In the embodiment of the invention, before the minimum opening degree of the spray valve is limited to the first opening degree, the opening degree of the spray valve is adjusted to the second opening degree and then adjusted to the first opening degree, wherein the second opening degree is larger than the first opening degree, namely, the opening degree of the spray valve is adjusted to be larger and then adjusted to be smaller, so that the voltage stabilizer and the spray pipeline can radiate heat, and the adjustment is performed after the opening degree of the spray valve is adjusted to be larger, thus being beneficial to reducing disturbance and improving the adjustment efficiency.
Further, in the process of adjusting the second opening degree to the first opening degree, the second opening degree is unidirectionally adjusted to the first opening degree, and unidirectional adjustment is beneficial to avoiding repeated adjustment, so that disturbance is further reduced, and adjustment efficiency is improved.
The present invention is not limited to the above preferred embodiments, and any modification, equivalent replacement or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A continuous spraying adjusting method for a voltage stabilizer of a nuclear power station is characterized by comprising the following steps:
in the process of starting a pressurized water reactor from cold shutdown to hot shutdown, limiting the minimum opening of a spray valve to a first opening, wherein when the spray valve is at the first opening, the temperature of a water outlet end of a spray pipeline is lower than that of a water inlet end connected with a water inlet end of a cold end of a primary circuit, and the temperature difference between the water outlet end and the water inlet end is less than 12 ℃;
and when the pressurized water reactor is in a hot shutdown state, the spray valve is adjusted to the optimal continuous spray opening.
2. The method for continuously spraying and adjusting the voltage stabilizer in the nuclear power plant as claimed in claim 1, wherein when the spraying valve is in the first opening degree, the temperature difference between the water outlet end and the water inlet end of the spraying pipeline is 7.5-8.5 ℃.
3. The method for continuously spraying and adjusting the voltage stabilizer in the nuclear power plant as claimed in claim 1, wherein when the spraying valve is in the first opening degree, the temperature difference between the water outlet end and the water inlet end of the spraying pipeline is 7.8-8.2 ℃.
4. The method for regulating the continuous spray of the nuclear power plant regulator according to claim 1, wherein the spray valve is adjusted to the optimal continuous spray opening degree, and a lower limit stopper is provided, wherein the lower limit stopper is used for limiting the spray valve to the optimal continuous spray opening degree.
5. The method for continuous spray regulation of a nuclear power plant regulator as recited in claim 4, wherein said lower limit stop is removably coupled to said spray valve.
6. The continuous spray regulation method of a nuclear power plant regulator as recited in claim 5, wherein the lower limit stop is removably coupled to the spray valve by a threaded connection.
7. The method for continuous spray regulation of a nuclear power plant regulator as recited in claim 6, wherein the threaded structure extends through the lower limit stop and threadably engages the spray valve to secure the lower limit stop to the spray valve.
8. The method for continuously spraying and adjusting the voltage stabilizer in the nuclear power plant as recited in claim 5, wherein the lower limit stop is detachably connected with the spray valve through a snap-fit structure.
9. The method for continuously spraying and adjusting the voltage stabilizer in the nuclear power plant according to any one of claims 1 to 8, wherein the opening degree of the spraying valve is adjusted to a second opening degree before the minimum opening degree of the spraying valve is limited to the first opening degree, and the second opening degree is larger than the first opening degree.
10. The method according to claim 9, wherein the second opening degree is unidirectionally adjusted to the first opening degree during the adjustment from the second opening degree to the first opening degree.
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| CN202010335174.9A CN111584103B (en) | 2020-04-24 | 2020-04-24 | Continuous spraying adjusting method for voltage stabilizer of nuclear power station |
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| CN202010335174.9A CN111584103B (en) | 2020-04-24 | 2020-04-24 | Continuous spraying adjusting method for voltage stabilizer of nuclear power station |
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| CN111584103B true CN111584103B (en) | 2022-04-29 |
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| CN115831403B (en) * | 2023-01-01 | 2023-09-26 | 南通曙光机电工程有限公司 | Cooling spray protection device for nuclear power station voltage stabilizer |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003270374A (en) * | 2002-03-19 | 2003-09-25 | Hitachi Ltd | Containment spray control device |
| CN104299661A (en) * | 2014-10-11 | 2015-01-21 | 中广核工程有限公司 | Transient test control method and system used in debugging and starting process of nuclear power station |
| CN205428503U (en) * | 2015-11-05 | 2016-08-03 | 中国核动力研究设计院 | Stabiliser spraying system for small -size PWR of integration |
| CN107908204A (en) * | 2017-11-17 | 2018-04-13 | 广东核电合营有限公司 | The scaling method and system of one loop of nuclear power station voltage-stablizer shower valve polarization aperture |
| CN111180097A (en) * | 2020-02-21 | 2020-05-19 | 三门核电有限公司 | Chemical deoxygenation method for primary loop of pressurized water reactor nuclear power plant |
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2020
- 2020-04-24 CN CN202010335174.9A patent/CN111584103B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003270374A (en) * | 2002-03-19 | 2003-09-25 | Hitachi Ltd | Containment spray control device |
| CN104299661A (en) * | 2014-10-11 | 2015-01-21 | 中广核工程有限公司 | Transient test control method and system used in debugging and starting process of nuclear power station |
| CN205428503U (en) * | 2015-11-05 | 2016-08-03 | 中国核动力研究设计院 | Stabiliser spraying system for small -size PWR of integration |
| CN107908204A (en) * | 2017-11-17 | 2018-04-13 | 广东核电合营有限公司 | The scaling method and system of one loop of nuclear power station voltage-stablizer shower valve polarization aperture |
| CN111180097A (en) * | 2020-02-21 | 2020-05-19 | 三门核电有限公司 | Chemical deoxygenation method for primary loop of pressurized water reactor nuclear power plant |
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