阅读说明：本技术 核电机组稳压器建腔控制方法及装置 (Cavity building control method and device for voltage stabilizer of nuclear power unit ) 是由 肖喆 顾政 路富强 朱守国 汪瑜裕 于 2020-04-26 设计创作，主要内容包括：本申请属于核电站一回路稳压器技术领域,提供了一种核电机组稳压器建腔控制方法及装置,该方法包括：若稳压器的运行信息满足建腔触发条件,控制RCV系统的上充流量维持在预设流量范围内,增大RCV系统的下泄流量；根据下泄孔板下游的测量压力调节压力控制阀的开度；关闭连接控制阀；若下泄流量下降至第一预设流量,降低压力控制阀的开度量；若下泄流量下降至第二预设流量,停止压力控制阀的调节,增大连接控制阀的开度量；若下泄流量上升至第三预设流量,停止连接控制阀的调节,降低上充流量；若上充流量降低至第四预设流量,且稳压器中的水位达到预设水位,则控制稳压器执行建腔操作。本发明能降低上充流体的升温速度和幅度,对瞬变起到了控制效果。(The application belongs to the technical field of a loop voltage stabilizer of a nuclear power station, and provides a method and a device for controlling cavity building of a voltage stabilizer of a nuclear power unit, wherein the method comprises the following steps: if the operation information of the voltage stabilizer meets the cavity building triggering condition, controlling the upper charging flow of the RCV system to be maintained within a preset flow range, and increasing the lower discharging flow of the RCV system; adjusting the opening of the pressure control valve according to the measured pressure downstream of the lower bleed orifice plate; closing the connection control valve; if the downward discharge flow rate is reduced to a first preset flow rate, reducing the opening amount of the pressure control valve; if the downward discharge flow rate is reduced to a second preset flow rate, stopping the adjustment of the pressure control valve, and increasing the opening amount of the connection control valve; if the lower discharge flow rises to a third preset flow, stopping the adjustment of the connection control valve, and reducing the upper charging flow; and if the upper charging flow is reduced to a fourth preset flow and the water level in the voltage stabilizer reaches a preset water level, controlling the voltage stabilizer to execute cavity building operation. The invention can reduce the temperature rise speed and amplitude of the upper filling fluid and has control effect on transient.)

1. A nuclear power unit voltage stabilizer cavity building control method is characterized by comprising the following steps:

acquiring operation information of the voltage stabilizer, and if the operation information meets a cavity building triggering condition, controlling the upper charging flow of the RCV system to be maintained within a preset flow range, and increasing the lower discharging flow of the RCV system;

acquiring the measured pressure at the downstream of the lower drain hole plate, and adjusting the opening of the pressure control valve according to the measured pressure;

closing a connection control valve between the RCV system and the RRA system, and acquiring the downward discharge flow of the RCV system;

if the downward flow of the RCV system is reduced to a first preset flow, reducing the opening amount of the pressure control valve to reduce the downward flow of the RCV system, so that the rising rate of the downward flow in a transient time interval is reduced;

continuously controlling the voltage stabilizer to keep the upper charging flow of the RCV system within the preset flow range;

if the downward discharge flow of the RCV system is reduced to a second preset flow, stopping the adjustment of the opening amount of the pressure control valve, and increasing the opening amount of the connection control valve to increase the downward discharge flow of the RCV system;

if the downward discharge flow of the RCV system rises to a third preset flow, stopping the opening adjustment of the connection control valve, and reducing the upward charging flow of the RCV system;

and if the upper charging flow of the RCV system is reduced to a fourth preset flow and the water level in the voltage stabilizer reaches a preset water level, balancing the upper charging flow and the lower discharging flow of the RCV system and controlling the voltage stabilizer to execute cavity building operation.

2. The nuclear power generating unit voltage regulator cavity building control method of claim 1, wherein after the step of obtaining operating information of the voltage regulator, the method further comprises:

and if the voltage stabilizer is continuously in a preset temperature range under the control of the pressure control valve within a preset time, judging that the operation information meets the cavity building triggering condition.

3. The nuclear power generating unit voltage regulator cavity building control method of claim 1, wherein after the step of adjusting the opening of the pressure control valve based on the measured pressure, the method further comprises:

judging whether the measured pressure is smaller than a pressure threshold value;

and when the measured pressure is judged to be smaller than the pressure threshold value, sending a low-pressure prompt aiming at the lower vent plate.

4. The nuclear power generating unit voltage regulator cavity building control method of claim 1, wherein after the step of increasing a bleed down flow of the RCV system, the method further comprises:

and monitoring the pressure value of the RCP system, and controlling the pressure value of the RCP system to be maintained within a preset pressure range.

5. The nuclear power generating unit voltage stabilizer cavity building control method of claim 1, wherein the preset flow range is 6-7 m³H, the first preset flow is 11m³H, the second preset flow is 5m³H, the third preset flow is 28.5m³H, the fourth preset flow is 3.4m³/h。

6. The nuclear power generating unit voltage stabilizer cavity building control method as claimed in claim 3, characterized in that the pressure threshold is 10 bar, and the preset water level is-4 m.

7. The utility model provides a nuclear power generating set stabiliser builds chamber controlling means which characterized in that includes:

the cavity building triggering module is used for acquiring the operation information of the voltage stabilizer, controlling the upper charging flow of the RCV system to be maintained within a preset flow range and increasing the lower discharging flow of the RCV system if the operation information meets the cavity building triggering condition;

the first valve adjusting module is used for acquiring the measured pressure at the downstream of the lower drain hole plate and adjusting the opening of the pressure control valve according to the measured pressure;

the lower leakage flow detection module is used for closing a connection control valve between the RCV system and the RRA system and acquiring the lower leakage flow of the RCV system;

a second valve adjustment module for decreasing the opening amount of the pressure control valve to decrease the letdown flow of the RCV system if the letdown flow of the RCV system decreases to a first preset flow, so that the rate of increase of the letdown flow within a transient time interval decreases;

the water level balance control module is used for continuously controlling the voltage stabilizer to keep the upper charging flow of the RCV system within the preset flow range;

the third valve adjusting module is used for stopping the adjustment of the opening amount of the pressure control valve and increasing the opening amount of the connection control valve to increase the downward discharge flow of the RCV system if the downward discharge flow of the RCV system is reduced to a second preset flow;

the upper charging flow control module is used for stopping the opening adjustment of the connection control valve and reducing the upper charging flow of the RCV system if the lower discharging flow of the RCV system rises to a third preset flow;

and the cavity building control module is used for balancing the upper charging flow and the lower discharging flow of the RCV system if the upper charging flow of the RCV system is reduced to a fourth preset flow and the water level in the voltage stabilizer reaches a preset water level, and controlling the voltage stabilizer to execute the cavity building operation.

8. The nuclear power generating unit voltage stabilizer cavity building control device of claim 7, wherein the cavity building triggering module is further configured to:

and if the voltage stabilizer is continuously in a preset temperature range under the control of the pressure control valve within a preset time, judging that the operation information meets the cavity building triggering condition.

9. The nuclear power unit voltage stabilizer cavity building control device as claimed in claim 7, further comprising:

the pressure monitoring module is used for judging whether the measured pressure is smaller than a pressure threshold value;

and when the measured pressure is judged to be smaller than the pressure threshold value, sending a low-pressure prompt aiming at the lower vent plate.

10. The nuclear power unit voltage stabilizer cavity building control device as claimed in claim 7, further comprising:

and the pressure stabilizing control module is used for monitoring the pressure value of the RCP system and controlling the pressure value of the RCP system to be maintained within a preset pressure range.

Technical Field

The invention belongs to the technical field of a nuclear power station primary loop voltage stabilizer, and particularly relates to a nuclear power unit voltage stabilizer cavity building control method and device.

Background

At present, the design operation life of a nuclear power unit in the world is 40 years, and the nuclear power unit generally operates for 60 years or even 80 years after safety evaluation. From the transient statistics perspective, when the unit is operated to the end of the service life (40 years), the margin of the residual transient is larger, the reactor loop is safer and more reliable, so the feedback and control of the severe transient, and the optimization of the operation is particularly important for prolonging the service life of the unit.

In the use process of the existing nuclear power unit, when a steam cavity of the voltage stabilizer is established, the pressure at the downstream of a lower vent plate is uncontrollably reduced along with the closing of a control valve on a connecting pipeline between an RRA system (a waste heat discharge system) and an RCV system (a chemical and volume control system), so that the lower discharge flow passing through a regenerative heat exchanger is increased, the temperature of an upper charging fluid is rapidly increased under the condition that the upper charging flow is not changed, the amplitude exceeds over 107 ℃, serious transient is generated, the transient threatens the strength of the connecting pipe area of the upper charging pipeline of the RCV system and a main loop of the RCP system (a reactor coolant system), and the serious transient of the RCV system caused in the process of establishing the steam cavity of the voltage stabilizer in the prior art can not be effectively actively controlled, so that the service life of the nuclear power unit is reduced.

Disclosure of Invention

The embodiment of the application provides a nuclear power generating unit voltage stabilizer cavity building control method and device, and aims to solve the problem that the service life of a nuclear power generating unit is short due to the fact that severe transient in an RCV system caused in the process of building a steam cavity by a voltage stabilizer cannot be effectively and actively controlled in the using process of the existing nuclear power generating unit.

In a first aspect, an embodiment of the present application provides a method for controlling a cavity building of a voltage stabilizer of a nuclear power generating unit, where the method includes:

acquiring operation information of the voltage stabilizer, and if the operation information meets a cavity building triggering condition, controlling the upper charging flow of the RCV system to be maintained within a preset flow range, and increasing the lower discharging flow of the RCV system;

acquiring the measured pressure at the downstream of the lower drain hole plate, and adjusting the opening of the pressure control valve according to the measured pressure;

closing a connection control valve between the RCV system and the RRA system, and acquiring the downward discharge flow of the RCV system;

if the downward flow of the RCV system is reduced to a first preset flow, reducing the opening amount of the pressure control valve to reduce the downward flow of the RCV system, so that the rising rate of the downward flow in a transient time interval is reduced;

continuously controlling the voltage stabilizer to keep the upper charging flow of the RCV system within the preset flow range;

if the downward discharge flow of the RCV system is reduced to a second preset flow, stopping the adjustment of the opening amount of the pressure control valve, and increasing the opening amount of the connection control valve to increase the downward discharge flow of the RCV system;

if the downward discharge flow of the RCV system rises to a third preset flow, stopping the opening adjustment of the connection control valve, and reducing the upward charging flow of the RCV system;

and if the upper charging flow of the RCV system is reduced to a fourth preset flow and the water level in the voltage stabilizer reaches a preset water level, balancing the upper charging flow and the lower discharging flow of the RCV system and controlling the voltage stabilizer to execute cavity building operation.

Compared with the prior art, the embodiment of the application has the advantages that: after the connection control valve is closed, the opening amount of the pressure control valve in the RCV system is reduced, the downward discharge rate of the RCV system and the pressure reduction speed of the downward discharge hole plate are reduced, the rising rate of the downward discharge rate in a transient time interval is reduced, the rising speed of the upward charge rate caused by water level balance of the voltage stabilizer is smaller, the heating speed and amplitude of the upward charge fluid are reduced, the temperature amplitude of the upward charge fluid is prevented from exceeding 107 ℃, the active control effect on serious transient is effectively achieved, the service life of the nuclear power unit is prolonged, the downward discharge rate is increased to a third preset flow rate, the upward charge rate is reduced to a fourth preset flow rate, the downward discharge rate and the upward charge rate meet the cavity building flow rate state of the voltage stabilizer, and the building stability of a voltage stabilizer air cavity is guaranteed.

Further, after the step of obtaining the operation information of the voltage regulator, the method further includes:

and if the voltage stabilizer is continuously in a preset temperature range under the control of the pressure control valve within a preset time, judging that the operation information meets the cavity building triggering condition.

Further, after the step of adjusting the opening degree of the pressure control valve according to the measured pressure, the method further includes:

judging whether the measured pressure is smaller than a pressure threshold value;

and when the measured pressure is judged to be smaller than the pressure threshold value, sending a low-pressure prompt aiming at the lower vent plate.

Further, after the step of increasing the bleed-down flow of the RCV system, the method further comprises:

and monitoring the pressure value of the RCP system, and controlling the pressure value of the RCP system to be maintained within a preset pressure range.

Further, the preset flow range is 6 to 7m³H, the first preset flow is 11m³H, the second preset flow is 5m³H, the third preset flow is 28.5m³H, the fourth preset flow is 3.4m³/h。

Further, the pressure threshold is 10 bar, and the preset water level is-4 m.

In a second aspect, an embodiment of the present application provides a nuclear power generating set voltage stabilizer cavity building control device, including:

the cavity building triggering module is used for acquiring the operation information of the voltage stabilizer, controlling the upper charging flow of the RCV system to be maintained within a preset flow range and increasing the lower discharging flow of the RCV system if the operation information meets the cavity building triggering condition;

the first valve adjusting module is used for acquiring the measured pressure at the downstream of the lower drain hole plate and adjusting the opening of the pressure control valve according to the measured pressure;

the lower leakage flow detection module is used for closing a connection control valve between the RCV system and the RRA system and acquiring the lower leakage flow of the RCV system;

a second valve adjustment module for decreasing the opening amount of the pressure control valve to decrease the letdown flow of the RCV system if the letdown flow of the RCV system decreases to a first preset flow, so that the rate of increase of the letdown flow within a transient time interval decreases;

the water level balance control module is used for continuously controlling the voltage stabilizer to keep the upper charging flow of the RCV system within the preset flow range;

the third valve adjusting module is used for stopping the adjustment of the opening amount of the pressure control valve and increasing the opening amount of the connection control valve to increase the downward discharge flow of the RCV system if the downward discharge flow of the RCV system is reduced to a second preset flow;

the upper charging flow control module is used for stopping the opening adjustment of the connection control valve and reducing the upper charging flow of the RCV system if the lower discharging flow of the RCV system rises to a third preset flow;

and the cavity building control module is used for balancing the upper charging flow and the lower discharging flow of the RCV system if the upper charging flow of the RCV system is reduced to a fourth preset flow and the water level in the voltage stabilizer reaches a preset water level, and controlling the voltage stabilizer to execute the cavity building operation.

Further, the cavity building triggering module is further configured to:

and if the voltage stabilizer is continuously in a preset temperature range under the control of the pressure control valve within a preset time, judging that the operation information meets the cavity building triggering condition.

Further, the cavity control device is built to nuclear power generating set stabiliser still includes:

the pressure monitoring module is used for judging whether the measured pressure is smaller than a pressure threshold value;

and when the measured pressure is judged to be smaller than the pressure threshold value, sending a low-pressure prompt aiming at the lower vent plate.

Further, the cavity control device is built to nuclear power generating set stabiliser still includes:

and the pressure stabilizing control module is used for monitoring the pressure value of the RCP system and controlling the pressure value of the RCP system to be maintained within a preset pressure range.

It is understood that the beneficial effects of the second aspect can be referred to the related description of the first aspect, and are not described herein again.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings used in the embodiments or the description of the prior art will be briefly described below.

Fig. 1 is a schematic diagram of a connection structure between an RCV system, an RRA system, and a voltage regulator according to a first embodiment of the present application;

FIG. 2 is a flowchart of a nuclear power generating unit voltage stabilizer cavity building control method according to a first embodiment of the present application;

FIG. 3 is a flowchart of a nuclear power generating unit voltage regulator cavity building control method according to a second embodiment of the present application;

fig. 4 is a schematic structural diagram of a nuclear power generating unit voltage regulator cavity building control device according to a third embodiment of the present application;

fig. 5 is a schematic structural diagram of a terminal device according to a fourth embodiment of the present application.

Detailed Description

In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.

It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

It should also be understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

As used in this specification and the appended claims, the term "if" may be interpreted contextually as "when", "upon" or "in response to" determining "or" in response to detecting ". Similarly, the phrase "if it is determined" or "if a [ described condition or event ] is detected" may be interpreted contextually to mean "upon determining" or "in response to determining" or "upon detecting [ described condition or event ]" or "in response to detecting [ described condition or event ]".

Furthermore, in the description of the present application and the appended claims, the terms "first," "second," "third," and the like are used for distinguishing between descriptions and not necessarily for describing or implying relative importance.

Reference throughout this specification to "one embodiment" or "some embodiments," or the like, means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the present application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," or the like, in various places throughout this specification are not necessarily all referring to the same embodiment, but rather "one or more but not all embodiments" unless specifically stated otherwise. The terms "comprising," "including," "having," and variations thereof mean "including, but not limited to," unless expressly specified otherwise.