CN117373705A - Sodium-cooled fast reactor three-loop hot start low-power stage regulation and control method and system - Google Patents

Sodium-cooled fast reactor three-loop hot start low-power stage regulation and control method and system Download PDF

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Publication number
CN117373705A
CN117373705A CN202311415797.7A CN202311415797A CN117373705A CN 117373705 A CN117373705 A CN 117373705A CN 202311415797 A CN202311415797 A CN 202311415797A CN 117373705 A CN117373705 A CN 117373705A
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sodium
stage
evaporator
hot start
fast reactor
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魏华彤
闫桂银
刘莉
郭林
张玉峰
宋磊
马惠昀
于沛
王佳卓
姚亦珺
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China Nuclear Power Engineering Co Ltd
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China Nuclear Power Engineering Co Ltd
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    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C7/00—Control of nuclear reaction
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C7/00—Control of nuclear reaction
    • G21C7/32—Control of nuclear reaction by varying flow of coolant through the core by adjusting the coolant or moderator temperature

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  • Engineering & Computer Science (AREA)
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  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Monitoring And Testing Of Nuclear Reactors (AREA)

Abstract

The invention discloses a method and a system for regulating and controlling a three-loop hot start low-power stage of a sodium-cooled fast reactor, wherein the method comprises the following steps: monitoring and acquiring stack power Pn of three-loop hot start of the sodium-cooled fast reactor in the current state, the sodium side outlet temperature T of the evaporator, the water side outlet pressure P of the evaporator and the water supply flow Q; judging whether the operation conditions of each operation stage of the three-loop hot start of the sodium-cooled fast reactor are met or not according to the obtained reactor power Pn, the sodium side outlet temperature T of the evaporator, the water side outlet pressure P of the evaporator and the water supply flow Q; and if the operating conditions of the three-loop hot start operating stage of the sodium-cooled fast reactor are met, adjusting working condition parameters of the hot start low-power stage of the sodium-cooled fast reactor according to a regulating and controlling method corresponding to the operating stage. The method and the system can solve the problem of complex working condition parameters of the three-loop hot start low-power stage of the sodium-cooled fast reactor.

Description

Sodium-cooled fast reactor three-loop hot start low-power stage regulation and control method and system
Technical Field
The invention relates to the field of three-loop control of a sodium-cooled fast reactor nuclear power plant, in particular to a method and a system for regulating and controlling a three-loop hot start low-power stage of a sodium-cooled fast reactor.
Background
The main water supply system has very important significance for the operation of the sodium-cooled fast reactor nuclear power station, and the main function of the main water supply system is to supply water to the steam generator. The design of the three loops of the sodium-cooled fast reactor is different from that of the two loops of the pressurized water reactor, the heat exchange between the two loops of the sodium-cooled fast reactor adopts a direct-flow steam generator, and the pressurized water reactor adopts a natural circulation steam generator. Although the heat exchange efficiency of the straight-flow steam generator is higher, the heat exchange process is more complex, the control requirement on the water supply is higher, and no corresponding reference scheme for adjustment is available at present.
On the one hand, in the low power stage in the hot start process of the sodium-cooled fast reactor, the design parameter changes are complex, the water supply flow, the outlet pressure of the evaporator and the outlet sodium temperature of the evaporator change greatly, and a single parameter is difficult to select as a control target, so that automatic control is difficult to realize. On the other hand, if manual control is adopted, the operator is required to be high due to complex operation, and the risk of misoperation of personnel is high.
The prior patent CN113539527A discloses a space heat pipe cooling reactor starting adjusting method and a system, wherein the method realizes the process of starting the reactor from zero power to full power by using three control modes of reactor power, reactor electric power and coolant temperature for sectional control. In the initial stage of the starting process, the coolant temperature is used as a controlled quantity, the coolant temperature is lifted along a coolant temperature lifting curve which simultaneously ensures the safety and the economy of the reactor, after the coolant temperature is lifted to a certain value in the middle stage of the starting process, the power control is switched to the power control of the reactor, the power lifting speed of the reactor and the period of the reactor are ensured not to exceed the limit value by taking the power of the reactor as the controlled quantity, the safety of the reactor is ensured, and after the temperature of the reactor core is lifted to a certain value in the later stage of the starting process, the power generating element is put into operation to generate electric power and is switched to the electric power control of the reactor. The patent has simpler division of the operation stages, and does not propose a corresponding scheme for low-power regulation in the fast reactor three-loop hot start process.
The prior patent CN115565701A discloses a lead cold fast reactor system and a control method, wherein the system comprises a reactor core control system and a steam generator control system; the reactor core control system comprises control rod regulation and main pump rotation speed regulation, and the steam generator control system comprises water supply flow regulation; in a lead-cooled fast reactor core, simultaneously obtaining power deviation and average temperature deviation of a coolant to adjust the speed of a control rod; the rotating speed of the main pump is regulated by adopting the feedback of the coolant flow; in once-through steam generators, feed water flow is regulated to control steam pressure using feed forward plus cascade control. The control method is provided for controlling the power and important parameters of the two-loop stack, and solves the problems that design parameters in a low power stage in a hot start process of a fast stack three-loop are complex in change, personnel misoperation risk is high, and automatic control is difficult to achieve.
In summary, the existing patent does not solve the problems of complex design parameter change, high risk of misoperation of personnel and difficulty in realizing automatic control in the low-power stage in the hot start process of the three loops of the sodium-cooled fast reactor.
Disclosure of Invention
Based on the technical problems, the invention provides a method and a system for regulating and controlling a low-power stage of three loops of a sodium-cooled fast reactor, which solve the problems that in the prior art, automatic regulation and control are difficult to realize due to complex design parameter changes in the low-power stage of the three loops of the sodium-cooled fast reactor in the process of hot starting, and the risk of misoperation is high due to manual control of operators.
In order to achieve the above purpose, the invention provides a method for regulating and controlling a three-loop hot start low-power stage of a sodium-cooled fast reactor, which comprises the following steps:
monitoring and acquiring stack power Pn of three-loop hot start of the sodium-cooled fast reactor in the current state, the sodium side outlet temperature T of the evaporator, the water side outlet pressure P of the evaporator and the water supply flow Q;
judging whether the starting conditions of all the operation stages of the three-loop hot start of the sodium-cooled fast reactor are met or not according to the obtained stack power Pn, the evaporator sodium side outlet temperature T, the evaporator water side outlet pressure P and the water supply flow Q;
if the operating conditions of the three-loop hot start operating stage of the sodium-cooled fast reactor are met, adjusting working condition parameters of the hot start low-power stage of the sodium-cooled fast reactor according to a regulating and controlling method corresponding to the operating stage;
the operation stage comprises a steam-water conversion stage, when the starting condition of the steam-water conversion stage is met, the water supply flow Q is maintained unchanged, the water side outlet pressure P of the evaporator is maintained unchanged, and the sodium side outlet temperature T of the evaporator is increased.
Further, the operation phase of the three-loop hot start of the sodium-cooled fast reactor further comprises: the preparation stage before starting, the water working condition power-up stage, the steam working condition power-up stage and the steam working condition pressure-up stage realize the three-loop hot start stable operation of the sodium-cooled fast reactor by adjusting working condition parameters in stages.
Further, if the operation condition of the three-loop hot start operation stage of the sodium-cooled fast reactor is satisfied, adjusting working condition parameters of the hot start low-power stage of the sodium-cooled fast reactor according to a regulation and control method corresponding to the operation stage, including:
the corresponding regulation and control method in the preparation stage before starting is that the rotating speed of the initial main water supply pump is set to be N 0 The main water supply bypass regulating valve keeps the outlet sodium temperature of the evaporator unchanged as T 0 。
Further, if the operation condition of the three-loop hot start operation stage of the sodium-cooled fast reactor is satisfied, the working condition parameters of the hot start low-power stage of the sodium-cooled fast reactor are adjusted according to the corresponding regulation and control method of the operation stage, and the method further comprises:
when the stack power is Pn 0 The outlet temperature of the sodium side of the evaporator is T 0 The outlet pressure of the water side of the evaporator is P 0 The water supply flow rate is Q 0 When the water working condition and the power increasing stage are met;
the corresponding regulation and control method of the water working condition power increasing stage is as follows: maintaining the rotation speed of the main water supply pump N 0 The main feed water bypass regulating valve automatically regulates the feed water flow rate Q by taking the evaporator outlet sodium temperature change function (F (Pn)) as a control target.
Further, if the operation condition of the three-loop hot start operation stage of the sodium-cooled fast reactor is satisfied, the working condition parameters of the hot start low-power stage of the sodium-cooled fast reactor are adjusted according to the corresponding regulation and control method of the operation stage, and the method further comprises:
when the stack power is equal to Pn 0 Rise to Pn 1 The sodium side outlet temperature of the evaporator is T 0 Rising to T 1 Evaporator water side outlet pressure maintenance P 0 Invariable, the water supply flow is controlled by Q 0 Up to Q 1 When the method is used, the operation condition of the steam-water conversion stage is met;
the corresponding regulation and control method of the steam-water conversion stage is that the rotation speed of the main water supply pump is maintained to be N 0 Unchanged, the main water supply bypass regulating valve is used for supplying water flow Q 1 Automatically adjusted for control purposes.
Further, if the operation condition of the three-loop hot start operation stage of the sodium-cooled fast reactor is satisfied, the working condition parameters of the hot start low-power stage of the sodium-cooled fast reactor are adjusted according to the corresponding regulation and control method of the operation stage, and the method further comprises:
when the stack power is equal to Pn 1 Rise to Pn 2 The sodium side outlet temperature of the evaporator is T 1 Rising to T 2 Evaporator water side outlet pressure maintenance P 0 Unchanged, water supply flow maintains Q 1 When the power-up stage meets the operation condition of the steam working condition;
the corresponding regulation and control method of the steam working condition power-up stage is that the rotation speed of the main water supply pump is maintained to be N 0 Unchanged, the main water supply bypass regulating valve is used for regulating the outlet sodium temperature T of the evaporator 2 Automatically adjusted for control purposes.
Further, if the operation condition of the three-loop hot start operation stage of the sodium-cooled fast reactor is satisfied, the working condition parameters of the hot start low-power stage of the sodium-cooled fast reactor are adjusted according to the corresponding regulation and control method of the operation stage, and the method further comprises:
when the stack power is equal to Pn 2 Rise to Pn 3 Evaporator sodium side outlet temperature maintenance T 2 Evaporator water side outlet pressure maintenance P 0 The water supply flow is represented by Q 1 Up to Q 2 The operation condition of the steam working condition boosting stage is met;
the corresponding regulation and control method of the steam working condition boosting stage is that the rotating speed of the main water supply pump is changed from N 0 Lifting to N 1 After the temperature is maintained unchanged, the main water supply bypass regulating valve is used for regulating the outlet sodium temperature T of the evaporator 3 Automatically adjusted for control purposes.
Further, if the starting condition of the three-loop hot start operation stage of the sodium-cooled fast reactor is satisfied, the working condition parameters of the low-power stage of the hot start of the sodium-cooled fast reactor are adjusted according to the corresponding regulation and control method of the operation stage, and the method further comprises the following steps:
when pile power maintains Pn 3 The outlet temperature of the sodium side of the evaporator is unchanged from T 2 Rising to T 3 The outlet pressure of the water side of the evaporator is defined by P 0 Rising to P 1 The water supply flow is represented by Q 2 Up to Q 3 When the control method is used, the state of the main water supply bypass regulating valve is maintained unchanged in the stage of lifting pressure under the steam working condition, and the main way regulating valve is switched into automatic control.
Further, the regulation method is performed in a semi-automatic, full-automatic or manual regulation mode.
Based on the technical scheme, the sodium-cooled fast reactor three-loop hot start low-power stage regulation method provided by the invention has at least the following beneficial effects:
1. according to the control method, the sodium-cooled fast reactor hot start low-power stage is divided into a plurality of stages according to the working condition parameter change of the sodium-cooled fast reactor hot start low-power stage, so that the parameters in each stage are monotone change, and the problem of complex working condition parameters of the sodium-cooled fast reactor three-loop hot start low-power stage is solved.
2. According to the control method, different control methods are set for different operation stages, and the working condition parameters of the sodium-cooled fast reactor at the low power stage of hot start are controlled by adjusting the rotating speed of the main water supply pump and the main water supply bypass regulating valve, so that the three loops of the sodium-cooled fast reactor are stably operated in hot start, and the operation requirement of a nuclear power plant is met. In order to achieve the same purpose as the method, the invention also provides a sodium-cooled fast reactor three-loop hot start low-power stage regulation system using the sodium-cooled fast reactor three-loop hot start low-power stage regulation method, which comprises the following steps:
the reading module is used for monitoring and acquiring the stack power Pn of the three-loop hot start of the sodium-cooled fast reactor in the current state, the sodium side outlet temperature T of the evaporator, the water side outlet pressure P of the evaporator and the water supply flow Q;
the calculation module is used for judging whether the operation conditions of each operation stage of the three-loop hot start of the sodium-cooled fast reactor are met or not according to the acquired stack power Pn, the acquired evaporator sodium side outlet temperature T, the acquired evaporator water side outlet pressure P and the acquired water supply flow Q;
the execution module is used for adjusting working condition parameters of the sodium-cooled fast reactor at a low-power stage of hot start according to a regulation and control method corresponding to the operation stage if the operation conditions of the three-loop hot start operation stage of the sodium-cooled fast reactor are met;
the operation stage comprises a steam-water conversion stage, when the starting condition of the steam-water conversion stage is met, the water supply flow Q is maintained unchanged, the water side outlet pressure P of the evaporator is maintained unchanged, and the sodium side outlet temperature T of the evaporator is increased.
Based on the technical scheme, the sodium-cooled fast reactor three-loop hot start low-power stage regulation and control system provided by the invention has at least the following beneficial effects:
1. according to the control system, the sodium-cooled fast reactor hot start low-power stage is divided into a plurality of stages according to the working condition parameter change of the sodium-cooled fast reactor hot start low-power stage, so that the parameters in each stage are monotone change, and the problem of complex working condition parameters of the sodium-cooled fast reactor three-loop hot start low-power stage is solved.
2. According to the control system, different control methods are set for different operation stages, and the working condition parameters of the sodium-cooled fast reactor at the low power stage of hot start are controlled by adjusting the rotating speed of the main water supply pump and the main water supply bypass control valve, so that the three-loop hot start of the sodium-cooled fast reactor is stably operated, and the operation requirements of a nuclear power plant are met.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
FIG. 1 is a schematic view of an evaporator feed water in one embodiment of the invention;
FIG. 2 is a flow chart of a method for controlling a three-loop hot start low power stage of a sodium-cooled fast reactor according to an embodiment of the present invention;
FIG. 3 is a flow chart of a method for controlling a three-loop hot start low power stage of a sodium-cooled fast reactor according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a three-loop hot start low power stage regulation system for a sodium-cooled fast reactor according to one embodiment of the present invention.
Wherein the above figures include the following reference numerals:
1. a deaerator; 2. a main feed water pump; 3. a venturi flow meter; 4. a main regulating valve; 5. a main feedwater bypass regulator valve; 6. an evaporator.
Detailed Description
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
The invention is described in further detail below in connection with specific examples which are not to be construed as limiting the scope of the invention as claimed.
Examples
The invention provides a method and a system for regulating and controlling a three-loop hot start low-power stage of a sodium-cooled fast reactor, which are used for solving the problems that in the prior art, automatic regulation and control are difficult to realize due to complex design parameter changes and the risk of misoperation caused by manual control of operators.
In order to achieve the purpose, the invention provides a three-loop hot start low-power stage regulation method of a sodium-cooled fast reactor.
In the embodiment, the main water feed pump and the main water feed regulating valve regulate the water supply of the evaporator according to the thermal power of the sodium side of the steam generator, and when the stack power is changed, the water feed amount of the evaporator is controlled by regulating the main water feed pump and the main water feed regulating valve so as to maintain the sodium temperature of the outlet of the evaporator, so that the operation requirement is met.
A schematic view of the water supply of an evaporator according to an embodiment of the present invention is shown in fig. 1, and the apparatus involved in the water supply of the evaporator as shown in fig. 1 includes: the deaerator 1, the main feed water pump 2, the venturi flowmeter 3, the main path regulating valve 4, the main feed water bypass regulating valve 5 and the evaporator 6. The water supply flow of the evaporator is understood as that the deaerator 1 deaerates, the main water supply pump 2 pumps water with a certain flow, and the water is conveyed into the evaporator through the main water supply bypass regulating valve 5. When the water supply flow is required to be changed in a large range, the rotating speed of the main water supply pump 2 is regulated; when a small range of feedwater flow variation is required, this can be regulated by the main feedwater bypass regulator valve 5. The water supply flow is flexibly regulated and controlled by a combined regulation and control mode of the main water supply pump 2 and the main water supply bypass regulating valve 5, and meanwhile, the regulation and control precision can be improved. Specifically, the main feedwater flow is measured by a venturi flow meter 3 upstream of a main feedwater bypass regulator 5, the evaporator outlet sodium temperature is measured by a temperature meter provided at the evaporator 6 sodium side outlet, and the evaporator outlet pressure is measured by a pressure meter provided at the evaporator water side outlet.
FIG. 2 shows a flow chart of a method for regulating and controlling a three-loop hot start low power stage of a sodium-cooled fast reactor according to one embodiment of the invention, and the method comprises the following substeps as shown in FIG. 2:
s1, monitoring and acquiring the stack power Pn of the three-loop hot start of the sodium-cooled fast reactor in the current state, the sodium side outlet temperature T of the evaporator, the water side outlet pressure P of the evaporator and the water supply flow Q.
S2, judging whether the operation conditions of each operation stage of the three-loop hot start of the sodium-cooled fast reactor are met or not according to the obtained stack power Pn, the obtained sodium side outlet temperature T of the evaporator, the obtained water side outlet pressure P of the evaporator and the obtained water supply flow Q.
In this embodiment, the operation phase of the three-loop hot start of the sodium-cooled fast reactor specifically includes: the method comprises a preparation stage before starting, a water working condition power increasing stage, a steam-water conversion stage, a steam working condition power increasing stage and a steam working condition pressure increasing stage, wherein parameters of each stage can be guaranteed to be monotonous change by adjusting working condition parameters in a staged mode, automatic regulation and control are convenient to achieve, and stable operation of three loops of the sodium-cooled fast reactor under hot start can be achieved.
And S3, if the operating conditions of the three-loop hot start operating stage of the sodium-cooled fast reactor are met, adjusting working condition parameters of the hot start low-power stage of the sodium-cooled fast reactor according to a corresponding adjusting and controlling method of the operating stage.
When the operation condition of the three-loop hot start operation stage of the sodium-cooled fast reactor is met, the water supply is regulated according to the sodium temperature of the outlet of the steam generator by regulating the rotation speed N of the main water supply pump and the main water supply bypass regulating valve in the embodiment.
As shown in fig. 3, a flow chart of a method for regulating and controlling a low-power phase of a three-loop hot start of a sodium-cooled fast reactor according to an embodiment of the present invention is shown, and a process for regulating working condition parameters of the low-power phase of the hot start of the sodium-cooled fast reactor in each operating phase will be further described below in combination with a method for regulating and controlling operating conditions of each operating phase in the three-loop hot start of the sodium-cooled fast reactor. As shown in fig. 3, the conditioning process includes the sub-steps of:
s100, setting the rotation speed of the main water supply pump to N 0 The main water supply bypass regulating valve keeps the outlet sodium temperature of the evaporator unchanged as T 0 。
The method comprises the step of initially setting the rotation speed of a main feed water pump and a main feed water bypass regulating valve in a preparation stage before starting so as to serve as a judgment basis of running conditions in different running stages.
When the stack power is Pn 0 The outlet temperature of the sodium side of the evaporator is T 0 The outlet pressure of the water side of the evaporator is P 0 The water supply flow rate is Q 0 When the starting operation condition of the water working condition power-up stage is met, step S200 can be executed, the water working condition power-up control is cut in, and the working condition parameters of the sodium-cooled fast reactor at the hot start low power stage are adjusted by using the corresponding adjusting and controlling method。
S200, controlling the power rise of the water cutting-in working condition, and maintaining the rotation speed of the main water supply pump to N 0 The main feed water bypass regulating valve automatically regulates the feed water flow rate Q by taking the evaporator outlet sodium temperature change function (F (Pn)) as a control target.
After the water-supply condition power-up control is started, the current operation stage is started from the preparation stage before starting to the water-supply condition power-up stage, in which the main water-supply pump rotating speed is maintained at N 0 The main feed water bypass regulating valve automatically regulates the feed water flow rate Q by taking the evaporator outlet sodium temperature change function (F (Pn)) as a control target.
Specifically, the process that the main water supply bypass regulating valve automatically regulates by taking the evaporator outlet sodium temperature change function (F (Pn)) as a control target can be understood as that the sodium temperature requirement is automatically calculated by using the evaporator outlet sodium temperature change function (F (Pn)) under different power platforms, the temperature is regulated and controlled by a temperature controller, then a temperature signal is input into a flow controller, the corresponding water supply flow is calculated, the water supply flow is actually regulated and controlled by the main water supply bypass regulating valve, and the sodium-water ratio and the outlet sodium temperature are calculated; then converting the sodium-water ratio into a signal through a transmitter, and calculating the water supply flow by combining a temperature controller; and converting the outlet sodium temperature into a signal through a temperature transmitter, and calculating the sodium temperature requirement by combining a sodium temperature change function.
The sodium temperature at the outlet of the evaporator can be automatically regulated along with the power change by the regulation mode, and the calculated sodium temperature requirement is used as the input of a control target regulation controller, so that the water supply flow Q is controlled.
When the stack power is equal to Pn 0 Rise to Pn 1 The sodium side outlet temperature of the evaporator is T 0 Rising to T 1 Evaporator water side outlet pressure maintenance P 0 Invariable, the water supply flow is controlled by Q 0 Up to Q 1 And when the operation condition of the steam-water conversion stage is met, the step S300 can be executed, steam-water conversion control is cut in, and the working condition parameters of the hot start low-power stage of the sodium-cooled fast reactor are adjusted by using a corresponding regulation and control method.
S300, cutting into steam-water conversion control to maintain the rotation speed of the main water supply pump to N 0 Invariable, main feed water by-pass regulating valve for feedingWater flow Q 1 Automatically adjusted for control purposes.
After switching on the steam-water conversion control, the current operation stage is started from the water working condition power-increasing stage to the steam-water conversion stage, and the main water supply pump rotating speed is maintained to be N in the steam-water conversion stage 0 Unchanged, the main water supply bypass regulating valve is used for supplying water flow Q 1 Automatically adjusted for control purposes.
The main water supply bypass regulating valve takes water supply flow Q as a control target to automatically regulate, and specifically comprises the following steps: the sodium temperature at the outlet of the evaporator, the sodium flow and the water supply flow are input into a controller, and the controller controls the water supply flow by adjusting the opening of the water supply regulating valve.
When the stack power is equal to Pn 1 Rise to Pn 2 The sodium side outlet temperature of the evaporator is T 1 Rising to T 2 Evaporator water side outlet pressure maintenance P 0 Unchanged, water supply flow maintains Q 1 And when the operating condition of the steam working condition power-up stage is met, the step S400 can be executed, the steam working condition power-up control is switched in, and the working condition parameters of the sodium-cooled fast reactor in the hot start low-power stage are adjusted by applying a corresponding adjusting and controlling method.
S400, controlling the power rise of the cut-in steam working condition to maintain the rotation speed of the main water supply pump to N 0 Unchanged, the main water supply bypass regulating valve is used for regulating the outlet sodium temperature T of the evaporator 2 Automatically adjusted for control purposes.
After the power-up control of the cut-in steam working condition, the current operation stage enters the power-up stage of the steam working condition from the steam-water conversion stage, and the main water supply pump is maintained at the rotation speed of N in the stage 0 Unchanged, the main water supply bypass regulating valve is used for regulating the outlet sodium temperature T of the evaporator 2 Automatically adjusted for control purposes.
Further, the process that the main water supply bypass regulating valve automatically regulates the outlet sodium temperature T of the evaporator by taking the outlet sodium temperature T of the evaporator as a control target can be understood as that the outlet sodium temperature of the evaporator, the sodium flow and the water supply flow are input into the controller, and the controller controls the water supply flow through the opening of the water supply regulating valve so as to ensure the outlet sodium temperature of the evaporator.
When the stack power is equal to Pn 2 Rise to Pn 3 Evaporator sodium side outlet temperature maintenance T 2 Evaporator water side outlet pressureForce maintenance P 0 The water supply flow is represented by Q 1 Up to Q 2 The starting condition of the steam working condition boosting stage is met, and step S500 can be executed at this time, the steam working condition boosting control is switched in, and the working condition parameters of the hot start low-power stage of the sodium-cooled fast reactor are adjusted by using a corresponding adjusting and controlling method.
S500, performing boost control on cut-in steam working conditions to ensure that the rotating speed of the main water supply pump is changed from N 0 Lifting to N 1 After the temperature is maintained unchanged, the main water supply bypass regulating valve is used for regulating the outlet sodium temperature T of the evaporator 3 Automatically adjusted for control purposes.
After the cut-in steam working condition boosting control, the current operation stage is started from the steam working condition boosting power to the steam working condition boosting control stage, and the main water supply pump is started to increase the rotating speed to N 1 After the temperature is maintained unchanged, the main water supply bypass regulating valve is used for regulating the outlet sodium temperature T of the evaporator 3 Automatically adjusted for control purposes.
When pile power maintains Pn 3 The outlet temperature of the sodium side of the evaporator is unchanged from T 2 Rising to T 3 The outlet pressure of the water side of the evaporator is defined by P 0 Rising to P 1 The water supply flow is represented by Q 2 Up to Q 3 And executing step S600, and regulating by adopting a corresponding regulation mode.
S600, maintaining the state of the main water supply bypass regulating valve at the stage of lifting pressure under the steam working condition unchanged, and automatically controlling the main way regulating valve to cut in.
It should be understood that in practical application, a semi-automatic, full-automatic or manual adjustment mode can be adopted to cut into different operation stages, and the corresponding regulation and control method of the different operation stages is executed in the semi-automatic, full-automatic or manual adjustment mode, so that the operation requirement of the three-loop hot start of the sodium-cooled fast reactor is met.
In summary, as can be seen from the above description, the above embodiments of the present invention achieve the following technical effects:
1. according to the control method, the sodium-cooled fast reactor hot start low-power stage is divided into a plurality of stages according to the working condition parameter change of the sodium-cooled fast reactor hot start low-power stage, so that the parameters in each stage are monotone change, and the problem of complex working condition parameters of the sodium-cooled fast reactor three-loop hot start low-power stage is solved.
2. According to the control method, different control methods are set for different operation stages, and the working condition parameters of the sodium-cooled fast reactor at the low power stage of hot start are controlled by adjusting the rotating speed of the main water supply pump and the main water supply bypass regulating valve, so that the three loops of the sodium-cooled fast reactor are stably operated in hot start, and the operation requirement of a nuclear power plant is met.
In order to achieve the same purpose as the method, the invention also provides a sodium-cooled fast reactor three-loop hot start low-power stage regulation system using the sodium-cooled fast reactor three-loop hot start low-power stage regulation method.
A schematic diagram of a three-loop hot start low power stage regulation system of a sodium-cooled fast reactor according to an embodiment of the present invention is shown in fig. 4, and the system includes a reading module 51, a calculating module 52, and an executing module 53, and the functions of the modules will be described in detail below.
The reading module 51 is used for monitoring and acquiring the stack power Pn, the evaporator sodium side outlet temperature T, the evaporator water side outlet pressure P and the feedwater flow Q of the three-loop hot start of the sodium-cooled fast reactor in the current state.
The calculation module 52 is configured to determine whether the operation conditions of each operation stage of the three-circuit hot start of the sodium-cooled fast reactor are satisfied according to the obtained stack power Pn, the evaporator sodium side outlet temperature T, the evaporator water side outlet pressure P, and the feedwater flow Q.
And the execution module 53 is configured to adjust working condition parameters of the hot start low-power stage of the sodium-cooled fast reactor according to a regulation and control method corresponding to the operation stage if the starting conditions of the three-loop hot start operation stage of the sodium-cooled fast reactor are satisfied.
The operation stage comprises a steam-water conversion stage, when the operation condition of the steam-water conversion stage is met, the water supply flow Q is maintained unchanged in the power lifting process, the water side outlet pressure P of the evaporator is maintained unchanged, and the sodium side outlet temperature T of the evaporator is increased in the process.
It should be understood that, the description of the three-loop hot start low-power stage control system of the sodium-cooled fast reactor is consistent with the description of the corresponding embodiment of the three-loop hot start low-power stage control method of the sodium-cooled fast reactor, so that the description of the embodiment is omitted.
In summary, as can be seen from the above description, the above embodiments of the present invention achieve the following technical effects:
1. according to the control system, the sodium-cooled fast reactor hot start low-power stage is divided into a plurality of stages according to the working condition parameter change of the sodium-cooled fast reactor hot start low-power stage, so that the parameters in each stage are monotone change, and the problem of complex working condition parameters of the sodium-cooled fast reactor three-loop hot start low-power stage is solved.
2. According to the control system, different control methods are set for different operation stages, and the working condition parameters of the sodium-cooled fast reactor at the low power stage of hot start are controlled by adjusting the rotating speed of the main water supply pump and the main water supply bypass control valve, so that the three-loop hot start of the sodium-cooled fast reactor is stably operated, and the operation requirements of a nuclear power plant are met.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises an element.
Logic and/or steps represented in the flowcharts or otherwise described herein, e.g., a ordered listing of executable instructions for implementing logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions.
It should be noted that in the description of the present specification, descriptions of terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

Claims (10)

1. A method for regulating and controlling a three-loop hot start low-power stage of a sodium-cooled fast reactor is characterized by comprising the following steps:
monitoring and acquiring stack power Pn of three-loop hot start of the sodium-cooled fast reactor in the current state, the sodium side outlet temperature T of the evaporator, the water side outlet pressure P of the evaporator and the water supply flow Q;
judging whether the operation conditions of each operation stage of the three-loop hot start of the sodium-cooled fast reactor are met or not according to the obtained stack power Pn, the obtained evaporator sodium side outlet temperature T, the obtained evaporator water side outlet pressure P and the obtained water supply flow Q;
if the operating conditions of the three-loop hot start operating stage of the sodium-cooled fast reactor are met, adjusting working condition parameters of the hot start low-power stage of the sodium-cooled fast reactor according to a regulating and controlling method corresponding to the operating stage;
the operation stage comprises a steam-water conversion stage, when the operation condition of the steam-water conversion stage is met, the water supply flow Q is maintained unchanged, the water side outlet pressure P of the evaporator is maintained unchanged, and the sodium side outlet temperature T of the evaporator is increased.
2. The method of claim 1, wherein the operational phase of the three loop hot start of the sodium cooled fast reactor further comprises: the preparation stage before starting, the water working condition power-up stage, the steam working condition power-up stage and the steam working condition pressure-up stage realize the three-loop hot start stable operation of the sodium-cooled fast reactor by adjusting working condition parameters in stages.
3. The method of claim 2, wherein if the operating condition of the three loop hot start operating phase of the sodium-cooled fast reactor is satisfied, adjusting the working condition parameters of the hot start low power phase of the sodium-cooled fast reactor according to the corresponding regulation method of the operating phase comprises:
the corresponding regulation and control method in the preparation stage before starting is that the rotating speed of the initial main water supply pump is set to be N 0 The main water supply bypass regulating valve keeps the outlet sodium temperature of the evaporator unchanged as T 0 。
4. The method of claim 3, wherein if the operating condition of the three loop hot start operating phase of the sodium-cooled fast reactor is satisfied, adjusting the operating condition parameters of the hot start low power phase of the sodium-cooled fast reactor according to the corresponding regulation method of the operating phase, further comprising:
when the stack power is Pn 0 The outlet temperature of the sodium side of the evaporator is T 0 The outlet pressure of the water side of the evaporator is P 0 The water supply flow rate is Q 0 When the water working condition and the power increasing stage are met;
the regulation and control method corresponding to the water working condition power increasing stage comprises the following steps: maintaining the rotation speed of the main water supply pump N 0 The main feed water bypass regulating valve automatically regulates the feed water flow rate Q by taking the evaporator outlet sodium temperature change function (F (Pn)) as a control target.
5. The method of claim 4, wherein if the operating condition of the three loop hot start operating phase of the sodium-cooled fast reactor is satisfied, adjusting the operating condition parameters of the hot start low power phase of the sodium-cooled fast reactor according to the corresponding regulation method of the operating phase, further comprising:
when the stack power is equal to Pn 0 Rise to Pn 1 The sodium side outlet temperature of the evaporator is T 0 Rising to T 1 Evaporator water side outlet pressure maintenance P 0 Invariable, the water supply flow is controlled by Q 0 Up to Q 1 When the method is used, the operation condition of the steam-water conversion stage is met;
the corresponding regulation and control method of the steam-water conversion stage is that the rotation speed of the main water supply pump is maintained to be N 0 Unchanged, the main water supply bypass regulating valve is used for supplying water flow Q 1 Automatically adjusted for control purposes.
6. The method of claim 5, wherein if the operating condition of the three loop hot start operating phase of the sodium-cooled fast reactor is satisfied, adjusting the operating condition parameters of the low power phase of the hot start of the sodium-cooled fast reactor according to the corresponding adjustment method of the operating phase, further comprising:
when the stack power is equal to Pn 1 Rise to Pn 2 The sodium side outlet temperature of the evaporator is T 1 Rising to T 2 Evaporator water side outlet pressure maintenance P 0 Unchanged, water supply flow maintains Q 1 When the power-up stage meets the operation condition of the steam working condition;
the corresponding regulation and control method of the steam working condition power increasing stage is that the rotating speed of the main water supply pump is maintained to be N 0 Unchanged, the main water supply bypass regulating valve is used for regulating the outlet sodium temperature T of the evaporator 2 Automatically adjusted for control purposes.
7. The method of claim 6, wherein if the operating condition of the three loop hot start operating phase of the sodium-cooled fast reactor is satisfied, adjusting the operating condition parameters of the low power phase of the hot start of the sodium-cooled fast reactor according to the corresponding adjustment method of the operating phase, further comprising:
when the stack power is equal to Pn 2 Rise to Pn 3 Evaporation ofTemperature maintenance T of sodium side outlet 2 Evaporator water side outlet pressure maintenance P 0 The water supply flow is represented by Q 1 Up to Q 2 The operation condition of the steam working condition boosting stage is met;
the corresponding regulation and control method of the steam working condition boosting stage is that the rotating speed of the main water supply pump is changed from N 0 Lifting to N 1 After the temperature is maintained unchanged, the main water supply bypass regulating valve is used for regulating the outlet sodium temperature T of the evaporator 3 Automatically adjusted for control purposes.
8. The method of claim 7, wherein if the operating condition of the three loop hot start operating phase of the sodium-cooled fast reactor is satisfied, adjusting the operating condition parameters of the low power phase of the hot start of the sodium-cooled fast reactor according to the corresponding regulation method of the operating phase, further comprising:
when pile power maintains Pn 3 The outlet temperature of the sodium side of the evaporator is unchanged from T 2 Rising to T 3 The outlet pressure of the water side of the evaporator is defined by P 0 Rising to P 1 The water supply flow is represented by Q 2 Up to Q 3 When the control method is used, the state of the main water supply bypass regulating valve is maintained unchanged in the stage of lifting pressure under the steam working condition, and the main way regulating valve is switched into automatic control.
9. The method according to any one of claims 2 to 8, wherein the regulating method is performed by means of semi-automatic, fully automatic or manual regulation.
10. A sodium-cooled fast reactor three-loop hot start low power stage regulation system using the sodium-cooled fast reactor three-loop hot start low power stage regulation method of any one of claims 1 to 8, comprising:
the reading module is used for monitoring and acquiring the stack power Pn of the three-loop hot start of the sodium-cooled fast reactor in the current state, the sodium side outlet temperature T of the evaporator, the water side outlet pressure P of the evaporator and the water supply flow Q;
the calculation module is used for judging whether the operation conditions of each operation stage of the three-loop hot start of the sodium-cooled fast reactor are met or not according to the acquired stack power Pn, the acquired evaporator sodium side outlet temperature T, the acquired evaporator water side outlet pressure P and the acquired water supply flow Q;
the execution module is used for adjusting working condition parameters of the sodium-cooled fast reactor at a low-power stage of hot start according to a regulation and control method corresponding to the operation stage if the starting conditions of the three-loop hot start operation stage of the sodium-cooled fast reactor are met;
the operation stage comprises a steam-water conversion stage, when the starting condition of the steam-water conversion stage is met, the water supply flow Q is maintained unchanged, the water side outlet pressure P of the evaporator is maintained unchanged, and the sodium side outlet temperature T of the evaporator is increased.
CN202311415797.7A 2023-10-27 2023-10-27 Sodium-cooled fast reactor three-loop hot start low-power stage regulation and control method and system Pending CN117373705A (en)

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CN202311415797.7A CN117373705A (en) 2023-10-27 2023-10-27 Sodium-cooled fast reactor three-loop hot start low-power stage regulation and control method and system

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