Running device and method for desalting water system of nuclear power plant

Abstract

The invention belongs to the technical field of nuclear power plant demineralized water systems, and particularly relates to a nuclear power plant demineralized water system operation device and method. The device comprises a pressure switch arranged on a desalted water system pipe network and used for sending out a desalted water system pipe network low pressure signal; the controller is provided with an operation mode of the nuclear power plant demineralized water system and is used for acquiring a pipe network pressure low signal of the demineralized water system in real time, selecting the operation mode of the nuclear power plant demineralized water system and performing operation control on the nuclear power plant demineralized water system according to the selected operation mode of the nuclear power plant demineralized water system; the operation modes of the desalting water system of the nuclear power plant comprise an independent operation mode and a combined operation mode. The method uses the device to control the operation of the desalted water system of the nuclear power plant. The operation flexibility and reliability of the desalting water system of the nuclear power plant are improved while the operation energy consumption of the desalting water system of the nuclear power plant is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of desalted water systems in nuclear power plants, and in particular to an operating device and method for a desalted water system in a nuclear power plant. Background Art

[0002] The desalted water system of a nuclear power plant includes two independent first desalted water systems and a second desalted water system.

[0003] The first desalted water system includes a first water tank, a first desalted water pump, a second desalted water pump and a first desalted water system pipeline network. The first desalted water pump inlet and the second desalted water pump inlet are respectively connected to the first water tank pipeline, the first desalted water pump outlet and the second desalted water pump outlet are respectively connected to the first desalted water system pipeline network pipeline, a first stop valve is provided on the pipeline connecting the first desalted water pump outlet and the first desalted water system pipeline network, and a second stop valve is provided on the pipeline connecting the second desalted water pump outlet and the first desalted water system pipeline network.

[0004] The second desalted water system includes a second water tank, a third desalted water pump, a fourth desalted water pump and a second desalted water system pipeline network. The third desalted water pump inlet and the fourth desalted water pump inlet are respectively connected to the second water tank pipeline, the third desalted water pump outlet and the fourth desalted water pump outlet are respectively connected to the second desalted water system pipeline network pipeline, a third stop valve is provided on the pipeline connecting the third desalted water pump outlet and the second desalted water system pipeline network, and a fourth stop valve is provided on the pipeline connecting the fourth desalted water pump outlet and the second desalted water system pipeline network.

[0005] The first desalted water system pipeline network and the second desalted water system pipeline network are connected through the first isolation valve and the second isolation valve pipeline. The first desalted water system and the second desalted water system are isolated by the first isolation valve and the second isolation valve, and the first isolation valve and the second isolation valve are both kept in a closed state.

[0006] The two desalination systems of the nuclear power plant desalination system operate independently of each other. The operation logic of each desalination system is: two desalination pumps are used as one for use and one for backup. When one desalination pump is running, it provides desalination flow when there is water demand in the desalination system network; when the main desalination pump stops operating, the backup desalination pump is started.

[0007] During the operation of the desalted water system of a nuclear power plant, the following problems exist:

[0008] 1. Each of the two desalted water systems has a desalted water pump in operation, which results in high energy consumption in the operation of the desalted water system of the nuclear power plant;

[0009] 2. If two desalting water pumps of a desalting water system fail at the same time, desalting water will not be provided to the desalting water system pipe network of the desalting water system, resulting in the loss of desalting water in the desalting water system pipe network of the desalting water system, making the operation of the desalting water system of the nuclear power plant unreliable;

[0010] 3. The emptying and maintenance of the desalting water tank of a desalting water system requires the shutdown of the two desalting water pumps of the desalting water system, which will cause the desalting water system pipeline of the desalting water system to lose desalting water. In order to ensure the desalting water supply of the desalting water system pipeline of the desalting water system, it is necessary to manually open the isolation valve between the two desalting water systems to connect the two desalting water systems, which makes the operation of the desalting water system of the nuclear power plant inflexible. Summary of the invention

[0011] In order to solve the problem that during the operation of the existing nuclear power plant desalting water system, two desalting water systems each have a desalting water pump in operation, resulting in high energy consumption of the nuclear power plant desalting water system, the present invention provides a nuclear power plant desalting water system operation device and method, which sets an independent operation mode and a joint operation mode for the nuclear power plant desalting water system to choose from; in the joint operation mode, the nuclear power plant desalting water system adopts two desalting water systems to maintain only one desalting water pump in operation, thereby achieving energy saving and consumption reduction.

[0012] In order to solve the problem that during the operation of the existing nuclear power plant desalting water system, two desalting water pumps of a desalting water system fail at the same time, which will make it impossible to provide desalting water for the desalting water system network of the desalting water system, resulting in the desalting water system network of the desalting water system losing desalted water, making the operation of the nuclear power plant desalting water system unreliable, the present invention provides a nuclear power plant desalting water system operation device and method, which sets an independent operation mode and a joint operation mode for the nuclear power plant desalting water system for selection; when the desalting water system of the nuclear power plant is in the joint operation mode, when two desalting water pumps of a desalting water system fail at the same time and cannot provide desalting water for the desalting water system network of the desalting water system, the other desalting water system provides desalting water for the desalting water system network of the failed desalting water system, which will not affect the desalting water supply of the desalting water system network of the failed desalting water system, thereby improving the reliability of the operation of the nuclear power plant desalting water system.

[0013] In order to solve the problem that during the operation of the existing nuclear power plant desalination system, the two desalination water pumps of the desalination water system need to be shut down for emptying the desalination water tank for maintenance, and in order to ensure the desalination water supply of the desalination water system pipeline network of the desalination water system, it is necessary to manually open the isolation valve between the two desalination water systems to connect the two desalination water systems, which makes the operation of the nuclear power plant desalination water system inflexible, the present invention provides a nuclear power plant desalination water system operation device and method, which sets an independent operation mode and a joint operation mode for the nuclear power plant desalination water system to provide options; when the desalination water tank of a desalination water system needs to be shut down for maintenance, and the two desalination water pumps of the desalination water system cannot be provided with desalination water for the desalination water system pipeline network of the desalination water system, the desalination water system of the nuclear power plant is selected Select the joint operation mode. In the joint operation mode, the desalting water system of the nuclear power plant automatically opens the isolation valve between the two desalting water systems to connect the two desalting water systems and provide desalting water for the desalting water system network for emptying and repairing the desalting water system. When a pipe ruptures in a desalting water system network, resulting in a large amount of desalting water leakage, select the independent operation mode for the desalting water system of the nuclear power plant. In the independent operation mode, the desalting water system of the nuclear power plant automatically closes the isolation valve between the two desalting water systems to isolate the two desalting water systems, thereby ensuring the desalting water supply to the desalting water system network of the normal operation desalting water system and reducing the desalting water leakage of the desalting water system of the nuclear power plant. The operation mode of the desalting water system of the nuclear power plant can be freely selected according to the actual situation to improve the flexibility of the operation of the desalting water system of the nuclear power plant.

[0014] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0015] A desalted water system operating device for a nuclear power plant, comprising:

[0016] A pressure switch disposed on the first desalted water system pipe network, used for measuring the pressure value of the first desalted water system pipe network in real time, and sending a first desalted water system pipe network low pressure signal when the pressure value of the first desalted water system pipe network is lower than a set value;

[0017] A pressure switch disposed on the second desalted water system pipe network is used to measure the pressure value of the second desalted water system pipe network in real time, and to send a second desalted water system pipe network low pressure signal when the pressure value of the second desalted water system pipe network is lower than a set value;

[0018] A controller, on which the operation mode of the desalted water system of the nuclear power plant is set, is used to obtain the low pressure signal of the first desalted water system pipe network and the low pressure signal of the second desalted water system pipe network in real time; select the operation mode of the desalted water system of the nuclear power plant; and control the operation of the desalted water system of the nuclear power plant according to the selected operation mode of the desalted water system of the nuclear power plant;

[0019] The operation modes of the desalinated water system of a nuclear power plant include independent operation mode and joint operation mode;

[0020] When the desalting water system of a nuclear power plant is in independent operation mode, the controller controls the operation of the desalting water system of the nuclear power plant as follows: close the first isolation valve and the second isolation valve, and operate the two desalting water systems independently; in each desalting water system, two desalting water pumps are used as one for use and one for backup, and the main desalting water pump is operated. When the main desalting water pump stops operating or the signal of low pressure in the desalting water system pipe network is delayed by T1, the backup desalting water pump is started;

[0021] When the desalting water system of a nuclear power plant is in the joint operation mode, the controller controls the operation of the desalting water system of the nuclear power plant as follows: open the first isolation valve and the second isolation valve, and jointly operate the two desalting water systems; in the two desalting water systems, one desalting water pump is the main desalting water pump, and the other three desalting water pumps are standby desalting water pumps, and the main desalting water pump is operated; when the signal delay T1 of the low pressure in the desalting water system pipeline is low, a standby desalting water pump with the shortest delay is started.

[0022] As one of the feasible ways, when the desalted water system of a nuclear power plant is in an independent operation mode, the controller obtains the operation status of the main desalted water pump of each desalted water system in real time;

[0023] The operation mode of the desalting water system of a nuclear power plant includes a first independent operation mode; the first independent operation mode is: the first desalting water pump and the third desalting water pump are both main desalting water pumps, and the second desalting water pump and the fourth desalting water pump are both standby desalting water pumps;

[0024] When the operation mode of the desalting water system of the nuclear power plant is selected as the first independent operation mode, the controller performs the following operation control on the desalting water system of the nuclear power plant: close the first isolation valve and the second isolation valve to isolate the first desalting water system from the second desalting water system; operate the first desalting water pump and the third desalting water pump; when the first desalting water pump stops operating or the first desalting water system pipeline pressure low signal delay T1, start the second desalting water pump; when the third desalting water pump stops operating or the second desalting water system pipeline pressure low signal delay T1, start the fourth desalting water pump.

[0025] As one of the achievable modes, the operation mode of the desalting water system of the nuclear power plant includes a second independent operation mode; the second independent operation mode is: the second desalting water pump and the fourth desalting water pump are both main desalting water pumps, and the first desalting water pump and the third desalting water pump are both standby desalting water pumps;

[0026] When the operation mode of the desalting water system of the nuclear power plant is selected as the second independent operation mode, the controller controls the operation of the desalting water system of the nuclear power plant as follows: close the first isolation valve and the second isolation valve to isolate the first desalting water system from the second desalting water system; operate the second desalting water pump and the fourth desalting water pump; when the second desalting water pump stops operating or the first desalting water system pipeline pressure low signal delay T1, start the first desalting water pump; when the fourth desalting water pump stops operating or the second desalting water system pipeline pressure low signal delay T1, start the third desalting water pump.

[0027] As one of the achievable modes, the operation mode of the desalting water system of the nuclear power plant includes a third independent operation mode; the third independent operation mode is: the first desalting water pump and the fourth desalting water pump are both main desalting water pumps, and the second desalting water pump and the third desalting water pump are both standby desalting water pumps;

[0028] When the operation mode of the desalting water system of the nuclear power plant is selected as the third independent operation mode, the controller performs the following operation control on the desalting water system of the nuclear power plant: close the first isolation valve and the second isolation valve to isolate the first desalting water system from the second desalting water system; operate the first desalting water pump and the fourth desalting water pump; when the first desalting water pump stops operating or the first desalting water system pipeline pressure low signal delay T1, start the second desalting water pump; when the fourth desalting water pump stops operating or the second desalting water system pipeline pressure low signal delay T1, start the third desalting water pump.

[0029] As one of the achievable modes, the operation mode of the desalting water system of the nuclear power plant includes a fourth independent operation mode; the fourth independent operation mode is: the second desalting water pump and the third desalting water pump are both main desalting water pumps, and the first desalting water pump and the fourth desalting water pump are both standby desalting water pumps;

[0030] When the operation mode of the desalting water system of the nuclear power plant is selected as the fourth independent operation mode, the controller controls the operation of the desalting water system of the nuclear power plant as follows: close the first isolation valve and the second isolation valve to isolate the first desalting water system from the second desalting water system; operate the second desalting water pump and the third desalting water pump; when the second desalting water pump stops operating or the first desalting water system pipeline pressure low signal delay T1, start the first desalting water pump; when the third desalting water pump stops operating or the second desalting water system pipeline pressure low signal delay T1, start the fourth desalting water pump.

[0031] As one of the achievable modes, the operation mode of the desalting water system of the nuclear power plant includes a first joint operation mode; the first joint operation mode is: the first desalting water pump is the main desalting water pump, and the second desalting water pump, the third desalting water pump and the fourth desalting water pump are all standby desalting water pumps;

[0032] When the operation mode of the desalting water system of the nuclear power plant is selected as the first combined operation mode, the controller performs the following operation control on the desalting water system of the nuclear power plant: open the first isolation valve and the second isolation valve to connect the first desalting water system and the second desalting water system as a whole; operate the first desalting water pump; when the low pressure signal delay of the first desalting water system network is T1 or the low pressure signal delay of the second desalting water system network is T1, start the third desalting water pump; when the low pressure signal delay of the first desalting water system network is T2 or the low pressure signal delay of the second desalting water system network is T2, it is determined that the third desalting water pump cannot be started, and the second desalting water pump or the fourth desalting water pump is started.

[0033] As one of the achievable modes, the operation mode of the desalting water system of the nuclear power plant includes a second joint operation mode; the second joint operation mode is: the second desalting water pump is the main desalting water pump, and the first desalting water pump, the third desalting water pump and the fourth desalting water pump are all standby desalting water pumps;

[0034] When the operation mode of the desalting water system of the nuclear power plant is selected as the second combined operation mode, the controller performs the following operation control on the desalting water system of the nuclear power plant: open the first isolation valve and the second isolation valve to connect the first desalting water system and the second desalting water system as a whole; operate the second desalting water pump; when the low pressure signal delay of the first desalting water system network is T1 or the low pressure signal delay of the second desalting water system network is T1, start the first desalting water pump or the third desalting water pump; when the low pressure signal delay of the first desalting water system network is T2 or the low pressure signal delay of the second desalting water system network is T2, it is determined that the first desalting water pump and the third desalting water pump cannot be started, and start the fourth desalting water pump.

[0035] As one of the achievable modes, the operation mode of the desalting water system of the nuclear power plant includes a third joint operation mode; the third joint operation mode is: the third desalting water pump is the main desalting water pump, and the first desalting water pump, the second desalting water pump and the fourth desalting water pump are all standby desalting water pumps;

[0036] When the operation mode of the desalting water system of the nuclear power plant is selected as the third joint operation mode, the controller performs the following operation control on the desalting water system of the nuclear power plant: open the first isolation valve and the second isolation valve to connect the first desalting water system and the second desalting water system as a whole; operate the third desalting water pump; when the low pressure signal delay T1 of the first desalting water system network or the low pressure signal delay T1 of the second desalting water system network, start the first desalting water pump; when the low pressure signal delay T2 of the first desalting water system network or the low pressure signal delay T2 of the second desalting water system network, it is determined that the first desalting water pump cannot be started, and the second desalting water pump or the fourth desalting water pump is started.

[0037] As one of the achievable modes, the operation mode of the desalting water system of the nuclear power plant includes a fourth joint operation mode; the fourth joint operation mode is: the fourth desalting water pump is the main desalting water pump, and the first desalting water pump, the second desalting water pump and the third desalting water pump are all standby desalting water pumps;

[0038] When the operation mode of the desalting water system of the nuclear power plant is selected as the fourth joint operation mode, the controller performs the following operation control on the desalting water system of the nuclear power plant: open the first isolation valve and the second isolation valve to connect the first desalting water system and the second desalting water system as a whole; operate the fourth desalting water pump; when the low pressure signal delay T1 of the first desalting water system network or the low pressure signal delay T1 of the second desalting water system network, start the first desalting water pump or the third desalting water pump; when the low pressure signal delay T2 of the first desalting water system network or the low pressure signal delay T2 of the second desalting water system network, it is determined that both the first desalting water pump and the third desalting water pump cannot be started, and start the second desalting water pump.

[0039] As one of the feasible ways, the low pressure setting value of the desalting water system pipeline is lower than the normal pressure value (0.1~0.2) MPa; T1 is greater than the normal pressure fluctuation time of the desalting water system pipeline (1~9) s; T2=T1+the time required to re-establish the pressure of the desalting water system pipeline after the standby desalting water pump is started+(2~3) s.

[0040] The present invention also provides a method for operating a desalted water system of a nuclear power plant, using the above-mentioned desalted water system operating device of a nuclear power plant, comprising the following steps:

[0041] Step 1: Select the operation mode of the desalted water system of the nuclear power plant on the controller;

[0042] Step 2: The controller controls the operation of the desalted water system of the nuclear power plant according to the selected operation mode of the desalted water system of the nuclear power plant.

[0043] Beneficial technical effects of the present invention:

[0044] The nuclear power plant desalting water system operation device and method of the present invention have a single operation mode and a joint operation mode for selection of the operation mode of the nuclear power plant desalting water system, and the operation mode of the nuclear power plant desalting water system can be freely selected according to actual conditions, thereby improving the flexibility of the operation of the nuclear power plant desalting water system; the nuclear power plant desalting water system under the joint operation mode adopts two desalting water systems to maintain the operation of only one desalting water pump, thereby achieving energy saving and consumption reduction; the nuclear power plant desalting water system under the joint operation mode has a main desalting water pump and three backup desalting water pumps, thereby ensuring the desalting water supply of the desalting water system pipelines of the two desalting water systems, thereby improving the reliability of the operation of the nuclear power plant desalting water system; it is applicable to the conventional island desalting water system and the nuclear island desalting water system of the nuclear power plant, and is also applicable to the desalting water system of the thermal power plant. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is a structural schematic diagram of an embodiment of a nuclear power plant desalted water system operating device of the present invention.

[0046] In the figure, 1, the first desalted water system; 2, the second desalted water system; 3, the first isolating valve; 4, the second isolating valve; 11, the first desalted water tank; 12, the first desalted water pump; 13, the second desalted water pump; 14, the first desalted water system pipe network; 15, the first stop valve; 16, the second stop valve; 17, the first pressure switch; 18, the second pressure switch; 21, the second desalted water tank; 22, the third desalted water pump; 23, the fourth desalted water pump; 24, the second desalted water system pipe network; 25, the third stop valve; 26, the fourth stop valve; 27, the third pressure switch; 28, the fourth pressure switch. DETAILED DESCRIPTION

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of the application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", "third", "fourth", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0048] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0049] The technical solution of the present invention is clearly and completely described below in conjunction with the accompanying drawings and specific embodiments.

[0050] The desalted water system of a nuclear power plant includes two independent first desalted water system 1 and second desalted water system 2;

[0051] The first desalted water system 1 comprises a first water tank 11, a first desalted water pump 12, a second desalted water pump 13 and a first desalted water system pipe network 14, wherein the inlet of the first desalted water pump 12 and the inlet of the second desalted water pump 13 are respectively connected to the first water tank 11 pipe, the outlet of the first desalted water pump 12 and the outlet of the second desalted water pump 13 are respectively connected to the first desalted water system pipe network 14 pipe, a first stop valve 15 is provided on the pipe connecting the outlet of the first desalted water pump 12 and the first desalted water system pipe network 14, and a second stop valve 16 is provided on the pipe connecting the outlet of the second desalted water pump 13 and the first desalted water system pipe network 14;

[0052] The second desalted water system 2 comprises a second water tank 21, a third desalted water pump 22, a fourth desalted water pump 23 and a second desalted water system pipe network 24, wherein the inlet of the third desalted water pump 22 and the inlet of the fourth desalted water pump 23 are respectively connected to the second water tank 21 pipe, the outlet of the third desalted water pump 22 and the outlet of the fourth desalted water pump 23 are respectively connected to the second desalted water system pipe network 24 pipe, a third stop valve 25 is provided on the pipe connecting the outlet of the third desalted water pump 22 and the second desalted water system pipe network 24, and a fourth stop valve 26 is provided on the pipe connecting the outlet of the fourth desalted water pump 23 and the second desalted water system pipe network 24;

[0053] The first desalted water system pipe network 14 and the second desalted water system pipe network 24 are connected by a first isolation valve 3 and a second isolation valve 4 pipeline.

[0054] This embodiment provides a desalted water system operating device for a nuclear power plant, including:

[0055] The first pressure switch 17 and the second pressure switch 18, which are redundant with each other, are arranged on the first desalted water system pipe network 14, and are used to measure the pressure value of the first desalted water system pipe network 14 in real time, and send a low pressure signal of the first desalted water system pipe network 14 when the pressure value of the first desalted water system pipe network 14 is lower than the set value;

[0056] The third pressure switch 27 and the fourth pressure switch 28, which are redundant with each other, are arranged on the second desalted water system network 24, and are used to measure the pressure value of the second desalted water system network 24 in real time, and send a low pressure signal of the second desalted water system network 24 when the pressure value of the second desalted water system network 24 is lower than the set value;

[0057] A controller, on which the operation mode of the desalted water system of the nuclear power plant is set, is used to obtain in real time the low pressure signal of the first desalted water system pipe network 14 emitted by the first pressure switch 17 and the second pressure switch 18, and the low pressure signal of the second desalted water system pipe network 24 emitted by the third pressure switch 27 and the fourth pressure switch 28; select the operation mode of the desalted water system of the nuclear power plant; and control the operation of the desalted water system of the nuclear power plant according to the selected operation mode of the desalted water system of the nuclear power plant;

[0058] The operation modes of the desalinated water system of a nuclear power plant include independent operation mode and joint operation mode;

[0059] When the desalting water system of a nuclear power plant is in independent operation mode, the controller controls the operation of the desalting water system of the nuclear power plant as follows: close the first isolation valve 3 and the second isolation valve 4, and operate the two desalting water systems independently; in each desalting water system, two desalting water pumps are used as one for use and one for backup, and the main desalting water pump is operated. When the main desalting water pump stops operating or the signal of low pressure in the desalting water system pipe network is delayed by T1, the backup desalting water pump is started;

[0060] When the desalting water system of a nuclear power plant is in the joint operation mode, the controller controls the operation of the desalting water system of the nuclear power plant as follows: open the first isolation valve 3 and the second isolation valve 4, and jointly operate the two desalting water systems; in the two desalting water systems, one desalting water pump is the main desalting water pump, and the other three desalting water pumps are standby desalting water pumps, and the main desalting water pump is operated; when the signal delay T1 of the low pressure in the desalting water system pipeline is low, a standby desalting water pump with the shortest delay is started.

[0061] In order to achieve the mode where only one desalting water pump is in operation for two desalting water systems, it is necessary to transmit the operating status of the two desalting water pumps of the first desalting water system 1 to the second desalting water system 2, or to transmit the operating status of the two desalting water pumps of the second desalting water system 2 to the first desalting water system 1. However, the two desalting water systems are far apart, and signal transmission lines need to be arranged through signal transmission, which makes construction difficult and the modification cost high.

[0062] The present invention provides two redundant pressure switches on the first desalted water system pipeline 14 and the second desalted water system pipeline 24; when the main desalted water pump stops operating, the pressure switch on the desalted water system pipeline will send a low pressure signal; the controller obtains the low pressure signal sent by the pressure switch in real time, and determines that the main desalted water pump is stopped according to the low pressure signal sent by the pressure switch, thereby starting the backup desalted water pump to maintain the pressure of the desalted water system pipeline.

[0063] In the joint operation mode of the desalting water system of a nuclear power plant, when the main desalting water pump stops operating, all three standby desalting water pumps will be started. The present invention sets different delays for the standby desalting water pumps, and the standby desalting water pump with a short delay is started first. When the standby desalting water pump with a short delay cannot be started, the standby desalting water pump with a long delay is started, so as to avoid starting the standby desalting water pumps at the same time.

[0064] In this embodiment, as one of the achievable ways, the desalted water system of the nuclear power plant is in an independent operation mode, and the controller obtains the operation status of the main desalted water pump of each desalted water system in real time;

[0065] The operation mode of the desalted water system of the nuclear power plant includes a first independent operation mode; the first independent operation mode is: the first desalted water pump 12 and the third desalted water pump 22 are both main desalted water pumps, and the second desalted water pump 13 and the fourth desalted water pump 23 are both standby desalted water pumps;

[0066] When the operation mode of the desalting water system of the nuclear power plant is selected as the first independent operation mode, the controller controls the operation of the desalting water system of the nuclear power plant as follows: close the first isolation valve 3 and the second isolation valve 4 to isolate the first desalting water system 1 and the second desalting water system 2; operate the first desalting water pump 12 and the third desalting water pump 22; when the first desalting water pump 12 stops operating or the pressure signal of the first desalting water system network 14 is delayed by T1, start the second desalting water pump 13; when the third desalting water pump 22 stops operating or the pressure signal of the second desalting water system network 24 is delayed by T1, start the fourth desalting water pump 23.

[0067] In this embodiment, as one of the achievable modes, the operation mode of the desalted water system of the nuclear power plant includes a second independent operation mode; the second independent operation mode is: the second desalted water pump 13 and the fourth desalted water pump 23 are both main desalted water pumps, and the first desalted water pump 12 and the third desalted water pump 22 are both standby desalted water pumps;

[0068] When the operation mode of the desalting water system of the nuclear power plant is selected as the second independent operation mode, the controller controls the operation of the desalting water system of the nuclear power plant as follows: close the first isolation valve 3 and the second isolation valve 4 to isolate the first desalting water system 1 and the second desalting water system 2; operate the second desalting water pump 13 and the fourth desalting water pump 23; when the second desalting water pump 13 stops operating or the pressure signal of the first desalting water system pipe network 14 is delayed by T1, start the first desalting water pump 12; when the fourth desalting water pump 23 stops operating or the pressure signal of the second desalting water system pipe network 24 is delayed by T1, start the third desalting water pump 22.

[0069] In this embodiment, as one of the achievable modes, the operation mode of the desalted water system of the nuclear power plant includes a third independent operation mode; the third independent operation mode is: the first desalted water pump 12 and the fourth desalted water pump 23 are both main desalted water pumps, and the second desalted water pump 13 and the third desalted water pump 22 are both standby desalted water pumps;

[0070] When the operation mode of the desalting water system of the nuclear power plant is selected as the third independent operation mode, the controller controls the operation of the desalting water system of the nuclear power plant as follows: close the first isolation valve 3 and the second isolation valve 4 to isolate the first desalting water system 1 and the second desalting water system 2; operate the first desalting water pump 12 and the fourth desalting water pump 23; when the first desalting water pump 12 stops operating or the pressure signal of the first desalting water system pipe network 14 is delayed by T1, start the second desalting water pump 13; when the fourth desalting water pump 23 stops operating or the pressure signal of the second desalting water system pipe network 24 is delayed by T1, start the third desalting water pump 22.

[0071] In this embodiment, as one of the achievable modes, the operation mode of the desalted water system of the nuclear power plant includes a fourth independent operation mode; the fourth independent operation mode is: the second desalted water pump 13 and the third desalted water pump 22 are both main desalted water pumps, and the first desalted water pump 12 and the fourth desalted water pump 23 are both standby desalted water pumps;

[0072] When the operation mode of the desalting water system of the nuclear power plant is selected as the fourth independent operation mode, the controller controls the operation of the desalting water system of the nuclear power plant as follows: close the first isolation valve 3 and the second isolation valve 4 to isolate the first desalting water system 1 and the second desalting water system 2; operate the second desalting water pump 13 and the third desalting water pump 22; when the second desalting water pump 13 stops operating or the pressure signal of the first desalting water system pipe network 14 is delayed by T1, start the first desalting water pump 12; when the third desalting water pump 22 stops operating or the pressure signal of the second desalting water system pipe network 24 is delayed by T1, start the fourth desalting water pump 23.

[0073] In this embodiment, as one of the achievable modes, the operation mode of the desalted water system of the nuclear power plant includes a first joint operation mode; the first joint operation mode is: the first desalted water pump 12 is a main desalted water pump, and the second desalted water pump 13, the third desalted water pump 22 and the fourth desalted water pump 23 are all standby desalted water pumps;

[0074] When the operation mode of the desalting water system of the nuclear power plant is selected as the first combined operation mode, the controller performs the following operation control on the desalting water system of the nuclear power plant: open the first isolation valve 3 and the second isolation valve 4 to connect the first desalting water system 1 and the second desalting water system 2 as a whole; operate the first desalting water pump 12; when the pressure signal delay T1 of the low pressure of the first desalting water system pipeline 14 or the pressure signal delay T1 of the second desalting water system pipeline 24, start the third desalting water pump 22; when the pressure signal delay T2 of the low pressure of the first desalting water system pipeline 14 or the pressure signal delay T2 of the second desalting water system pipeline 24, it is determined that the third desalting water pump 22 cannot be started, and the second desalting water pump 13 or the fourth desalting water pump 23 is started.

[0075] In this embodiment, as one of the achievable modes, the operation mode of the desalted water system of the nuclear power plant includes a second joint operation mode; the second joint operation mode is: the second desalted water pump 13 is a main desalted water pump, and the first desalted water pump 12, the third desalted water pump 22 and the fourth desalted water pump 23 are all standby desalted water pumps;

[0076] When the operation mode of the desalting water system of the nuclear power plant is selected as the second combined operation mode, the controller performs the following operation control on the desalting water system of the nuclear power plant: open the first isolation valve 3 and the second isolation valve 4 to connect the first desalting water system 1 and the second desalting water system 2 as a whole; operate the second desalting water pump 13; when the pressure signal delay T1 of the low pressure of the first desalting water system pipeline 14 or the pressure signal delay T1 of the second desalting water system pipeline 24, start the first desalting water pump 12 or the third desalting water pump 22; when the pressure signal delay T2 of the low pressure of the first desalting water system pipeline 14 or the pressure signal delay T2 of the second desalting water system pipeline 24, it is determined that the first desalting water pump 12 and the third desalting water pump 22 cannot be started, and start the fourth desalting water pump 23.

[0077] In this embodiment, as one of the achievable modes, the operation mode of the desalted water system of the nuclear power plant includes a third joint operation mode; the third joint operation mode is: the third desalted water pump 22 is the main desalted water pump, and the first desalted water pump 12, the second desalted water pump 13 and the fourth desalted water pump 23 are all standby desalted water pumps;

[0078] When the operation mode of the desalting water system of the nuclear power plant is selected as the third combined operation mode, the controller performs the following operation control on the desalting water system of the nuclear power plant: open the first isolation valve 3 and the second isolation valve 4 to connect the first desalting water system 1 and the second desalting water system 2 as a whole; operate the third desalting water pump 22; when the pressure signal delay T1 of the first desalting water system pipeline 14 is low or the pressure signal delay T1 of the second desalting water system pipeline 24 is low, start the first desalting water pump 12; when the pressure signal delay T2 of the first desalting water system pipeline 14 is low or the pressure signal delay T2 of the second desalting water system pipeline 24 is low, it is determined that the first desalting water pump 12 cannot be started, and the second desalting water pump 13 or the fourth desalting water pump 23 is started.

[0079] In this embodiment, as one of the achievable modes, the operation mode of the desalted water system of the nuclear power plant includes a fourth joint operation mode; the fourth joint operation mode is: the fourth desalted water pump 23 is a main desalted water pump, and the first desalted water pump 12, the second desalted water pump 13 and the third desalted water pump 22 are all standby desalted water pumps;

[0080] When the operation mode of the desalting water system of the nuclear power plant is selected as the fourth joint operation mode, the controller performs the following operation control on the desalting water system of the nuclear power plant: open the first isolation valve 3 and the second isolation valve 4 to connect the first desalting water system 1 and the second desalting water system 2 as a whole; operate the fourth desalting water pump 23; when the pressure signal delay T1 of the first desalting water system pipeline 14 is low or the pressure signal delay T1 of the second desalting water system pipeline 24 is low, start the first desalting water pump 12 or the third desalting water pump 22; when the pressure signal delay T2 of the first desalting water system pipeline 14 is low or the pressure signal delay T2 of the second desalting water system pipeline 24 is low, it is determined that the first desalting water pump 12 and the third desalting water pump 22 cannot be started, and start the second desalting water pump 13.

[0081] In this embodiment, as one of the achievable methods, the normal pressure of the desalted water system network is 0.5MPa, because This setting The low pressure setting values ​​of the first desalted water system pipe network 14 and the second desalted water system pipe network 24 are both 0.4 MPa, which can be adjusted between (0.3-0.4) MPa according to actual conditions.

[0082] In this embodiment, as one of the feasible methods, during the operation of the main desalted water pump, the pressure of the desalted water system pipeline may fluctuate due to factors such as changes in water consumption. The fluctuation time is generally (1 to 3) seconds, and then it recovers to 0.5MPa. Therefore, T1 is set to 5 seconds, and it can be adjusted between (4 to 10) seconds according to actual conditions to avoid the standby start-up of the standby desalted water pump due to normal pressure fluctuations.

[0083] In this embodiment, as one of the feasible methods, after the main desalting water pump stops operating, it takes (2 to 3) seconds for the standby desalting water pump to start up and re-establish the desalting water system pipeline pressure, so T2=T1+5S is set; T2 is 10s, and can be adjusted between (8 to 16)s according to actual conditions to avoid erroneous judgment that the standby desalting water pump cannot be started.

[0084] Those skilled in the art may also set the first desalted water pump 12 and the third desalted water pump 22 as backup desalted water pumps to start with a delay of T2 for backup, and set the second desalted water pump 13 and the fourth desalted water pump 23 as backup desalted water pumps to start with a delay of T1 for backup. The backup start logic is similar to that of the present embodiment and will not be described in detail.

[0085] This embodiment also provides a method for operating a desalted water system in a nuclear power plant, using the above-mentioned desalted water system operating device in a nuclear power plant, comprising the following steps:

[0086] Step 1: Select the operation mode of the desalted water system of the nuclear power plant on the controller;

[0087] Step 2: The controller controls the operation of the desalted water system of the nuclear power plant according to the selected operation mode of the desalted water system of the nuclear power plant.

[0088] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A desalted water system operating device for a nuclear power plant, characterized in that: include: A pressure switch disposed on the first desalted water system pipe network (14), used to measure the pressure value of the first desalted water system pipe network (14) in real time, and to send a first desalted water system pipe network (14) low pressure signal when the pressure value of the first desalted water system pipe network (14) is lower than a set value; A pressure switch disposed on the second desalted water system pipe network (24), used to measure the pressure value of the second desalted water system pipe network (24) in real time, and to send a second desalted water system pipe network (24) low pressure signal when the pressure value of the second desalted water system pipe network (24) is lower than a set value; a controller having an operation mode of a desalted water system of a nuclear power plant, and used for obtaining in real time a low pressure signal of a first desalted water system pipe network (14) and a low pressure signal of a second desalted water system pipe network (24); selecting an operation mode of the desalted water system of the nuclear power plant; and controlling the operation of the desalted water system of the nuclear power plant according to the selected operation mode of the desalted water system of the nuclear power plant; The operation modes of the desalinated water system of a nuclear power plant include independent operation mode and joint operation mode; When the desalting water system of a nuclear power plant is in an independent operation mode, the controller controls the operation of the desalting water system of the nuclear power plant as follows: the first isolation valve (3) and the second isolation valve (4) are closed, and the two desalting water systems are operated independently; in each desalting water system, two desalting water pumps are used as one for use and one for backup, and the main desalting water pump is operated. When the main desalting water pump stops operating or the signal of low pressure in the desalting water system pipe network is delayed by T1, the backup desalting water pump is started; When the desalting water system of a nuclear power plant is in the joint operation mode, the controller controls the operation of the desalting water system of the nuclear power plant as follows: the first isolation valve (3) and the second isolation valve (4) are opened to jointly operate the two desalting water systems; in the two desalting water systems, one desalting water pump is the main desalting water pump, and the other three desalting water pumps are standby desalting water pumps, and the main desalting water pump is operated; when the signal of low pressure in the pipeline network of the desalting water system is delayed by T1, a standby desalting water pump with the shortest delay is started.

2. The desalted water system operating device for a nuclear power plant according to claim 1, characterized in that: The operation mode of the desalted water system of a nuclear power plant includes a first independent operation mode; the first independent operation mode is: the first desalted water pump (12) and the third desalted water pump (22) are both main desalted water pumps, and the second desalted water pump (13) and the fourth desalted water pump (23) are both standby desalted water pumps; When the operation mode of the desalted water system of the nuclear power plant is selected as the first independent operation mode, the controller performs the following operation control on the desalted water system of the nuclear power plant: the first isolation valve (3) and the second isolation valve (4) are closed to isolate the first desalted water system (1) and the second desalted water system (2); the first desalted water pump (12) and the third desalted water pump (22) are operated; when the first desalted water pump (12) stops operating or the pressure signal of the first desalted water system pipe network (14) is delayed by T1, the second desalted water pump (13) is started; when the third desalted water pump (22) stops operating or the pressure signal of the second desalted water system pipe network (24) is delayed by T1, the fourth desalted water pump (23) is started; T1 is greater than the normal pressure fluctuation time of the desalted water system pipe network by (1 to 9) s; the low pressure setting value of the desalted water system pipe network is lower than the normal pressure value by (0.1 to 0.2) MPa.

3. The desalted water system operating device for a nuclear power plant according to claim 1, characterized in that: The operation mode of the desalted water system of a nuclear power plant includes a second independent operation mode; the second independent operation mode is: the second desalted water pump (13) and the fourth desalted water pump (23) are both main desalted water pumps, and the first desalted water pump (12) and the third desalted water pump (22) are both standby desalted water pumps; When the operation mode of the desalted water system of the nuclear power plant is selected as the second independent operation mode, the controller performs the following operation control on the desalted water system of the nuclear power plant: close the first isolation valve (3) and the second isolation valve (4) to isolate the first desalted water system (1) and the second desalted water system (2); operate the second desalted water pump (13) and the fourth desalted water pump (23); when the second desalted water pump (13) stops operating or the pressure signal of the first desalted water system pipe network (14) is delayed by T1, start the first desalted water pump (12); when the fourth desalted water pump (23) stops operating or the pressure signal of the second desalted water system pipe network (24) is delayed by T1, start the third desalted water pump (22); T1 is greater than the normal pressure fluctuation time of the desalted water system pipe network by (1 to 9) s; the low pressure setting value of the desalted water system pipe network is lower than the normal pressure value by (0.1 to 0.2) MPa.

4. The desalted water system operating device for a nuclear power plant according to claim 1, characterized in that: The operation mode of the desalted water system of the nuclear power plant includes a third independent operation mode; the third independent operation mode is: the first desalted water pump (12) and the fourth desalted water pump (23) are both main desalted water pumps, and the second desalted water pump (13) and the third desalted water pump (22) are both standby desalted water pumps; When the operation mode of the desalted water system of the nuclear power plant is selected as the third independent operation mode, the controller performs the following operation control on the desalted water system of the nuclear power plant: close the first isolation valve (3) and the second isolation valve (4) to isolate the first desalted water system (1) and the second desalted water system (2); operate the first desalted water pump (12) and the fourth desalted water pump (23); when the first desalted water pump (12) stops operating or the pressure signal of the first desalted water system pipe network (14) is delayed by T1, start the second desalted water pump (13); when the fourth desalted water pump (23) stops operating or the pressure signal of the second desalted water system pipe network (24) is delayed by T1, start the third desalted water pump (22); T1 is greater than the normal pressure fluctuation time of the desalted water system pipe network by (1 to 9) s; the low pressure setting value of the desalted water system pipe network is lower than the normal pressure value by (0.1 to 0.2) MPa.

5. The desalted water system operating device for a nuclear power plant according to claim 1, characterized in that: The operation mode of the desalted water system of a nuclear power plant includes a fourth independent operation mode; the fourth independent operation mode is: the second desalted water pump (13) and the third desalted water pump (22) are both main desalted water pumps, and the first desalted water pump (12) and the fourth desalted water pump (23) are both standby desalted water pumps; When the operation mode of the desalted water system of the nuclear power plant is selected as the fourth independent operation mode, the controller performs the following operation control on the desalted water system of the nuclear power plant: the first isolation valve (3) and the second isolation valve (4) are closed to isolate the first desalted water system (1) and the second desalted water system (2); the second desalted water pump (13) and the third desalted water pump (22) are operated; when the second desalted water pump (13) stops operating or the pressure signal of the first desalted water system pipe network (14) is delayed by T1, the first desalted water pump (12) is started; when the third desalted water pump (22) stops operating or the pressure signal of the second desalted water system pipe network (24) is delayed by T1, the fourth desalted water pump (23) is started; T1 is greater than the normal pressure fluctuation time of the desalted water system pipe network by (1 to 9) s; and the low pressure setting value of the desalted water system pipe network is lower than the normal pressure value by (0.1 to 0.2) MPa.

6. The desalted water system operating device for a nuclear power plant according to claim 1, characterized in that: The operation mode of the desalted water system of a nuclear power plant includes a first combined operation mode; the first combined operation mode is: the first desalted water pump (12) is a main desalted water pump, and the second desalted water pump (13), the third desalted water pump (22) and the fourth desalted water pump (23) are all standby desalted water pumps; When the operation mode of the desalted water system of the nuclear power plant is selected as the first combined operation mode, the controller performs the following operation control on the desalted water system of the nuclear power plant: opening the first isolation valve (3) and the second isolation valve (4) to connect the first desalted water system (1) and the second desalted water system (2) into a whole; operating the first desalted water pump (12); starting the third desalted water pump (22) when the pressure low signal delay T1 of the first desalted water system pipe network (14) or the pressure low signal delay T1 of the second desalted water system pipe network (24); When the pressure signal delay of the network (14) is low by T2 or the pressure signal delay of the second desalting water system network (24) is low by T2, it is determined that the third desalting water pump (22) cannot be started, and the second desalting water pump (13) or the fourth desalting water pump (23) is started; T1 is greater than the normal pressure fluctuation time of the desalting water system network by (1 to 9) s; T2 = T1 + the time required to re-establish the pressure of the desalting water system network after the standby desalting water pump is started + (2 to 3) s; the low pressure setting value of the desalting water system network is lower than the normal pressure value by (0.1 to 0.2) MPa.

7. The desalted water system operating device for a nuclear power plant according to claim 1, characterized in that: The operation mode of the desalted water system of the nuclear power plant includes a second joint operation mode; the second joint operation mode is: the second desalted water pump (13) is a main desalted water pump, and the first desalted water pump (12), the third desalted water pump (22) and the fourth desalted water pump (23) are all standby desalted water pumps; When the operation mode of the desalted water system of the nuclear power plant is selected as the second combined operation mode, the controller performs the following operation control on the desalted water system of the nuclear power plant: opening the first isolation valve (3) and the second isolation valve (4) to connect the first desalted water system (1) and the second desalted water system (2) into a whole; operating the second desalted water pump (13); when the pressure low signal delay T1 of the first desalted water system pipe network (14) or the pressure low signal delay T1 of the second desalted water system pipe network (24), starting the first desalted water pump (12) or the third desalted water pump (22); When the low pressure signal delay T2 of the salt water system pipe network (14) or the low pressure signal delay T2 of the second desalted water system pipe network (24), it is determined that both the first desalted water pump (12) and the third desalted water pump (22) cannot be started, and the fourth desalted water pump (23) is started; T1 is greater than the normal pressure fluctuation time of the desalted water system pipe network by (1 to 9) s; T2 = T1 + the time required to re-establish the pressure of the desalted water system pipe network after the standby desalted water pump is started + (2 to 3) s; the low pressure setting value of the desalted water system pipe network is lower than the normal pressure value by (0.1 to 0.2) MPa.

8. The desalted water system operating device for a nuclear power plant according to claim 1, characterized in that: The operation mode of the desalted water system of the nuclear power plant includes a third joint operation mode; the third joint operation mode is: the third desalted water pump (22) is a main desalted water pump, and the first desalted water pump (12), the second desalted water pump (13) and the fourth desalted water pump (23) are all standby desalted water pumps; When the operation mode of the desalted water system of the nuclear power plant is selected as the third combined operation mode, the controller performs the following operation control on the desalted water system of the nuclear power plant: opening the first isolation valve (3) and the second isolation valve (4) to connect the first desalted water system (1) and the second desalted water system (2) into a whole; operating the third desalted water pump (22); starting the first desalted water pump (12) when the pressure low signal delay T1 of the first desalted water system pipe network (14) or the pressure low signal delay T1 of the second desalted water system pipe network (24); When the pressure signal delay of the network (14) is low by T2 or the pressure signal delay of the second desalting water system network (24) is low by T2, it is determined that the first desalting water pump (12) cannot be started, and the second desalting water pump (13) or the fourth desalting water pump (23) is started; T1 is greater than the normal pressure fluctuation time of the desalting water system network by (1 to 9) s; T2 = T1 + the time required to re-establish the pressure of the desalting water system network after the standby desalting water pump is started + (2 to 3) s; the low pressure setting value of the desalting water system network is lower than the normal pressure value by (0.1 to 0.2) MPa.

9. The desalted water system operating device for a nuclear power plant according to claim 1, characterized in that: The operation mode of the desalted water system of the nuclear power plant includes a fourth joint operation mode; the fourth joint operation mode is: the fourth desalted water pump (23) is a main desalted water pump, and the first desalted water pump (12), the second desalted water pump (13) and the third desalted water pump (22) are all standby desalted water pumps; When the operation mode of the desalted water system of the nuclear power plant is selected as the fourth combined operation mode, the controller performs the following operation control on the desalted water system of the nuclear power plant: opening the first isolation valve (3) and the second isolation valve (4) to connect the first desalted water system (1) and the second desalted water system (2) into a whole; operating the fourth desalted water pump (23); starting the first desalted water pump (12) or the third desalted water pump (22) when the pressure low signal delay T1 of the first desalted water system pipe network (14) or the pressure low signal delay T1 of the second desalted water system pipe network (24); When the low pressure signal delay T2 of the salt water system pipe network (14) or the low pressure signal delay T2 of the second desalted water system pipe network (24), it is determined that both the first desalted water pump (12) and the third desalted water pump (22) cannot be started, and the second desalted water pump (13) is started; T1 is greater than the normal pressure fluctuation time of the desalted water system pipe network by (1 to 9) s; T2 = T1 + the time required to re-establish the pressure of the desalted water system pipe network after the standby desalted water pump is started + (2 to 3) s; the low pressure setting value of the desalted water system pipe network is lower than the normal pressure value by (0.1 to 0.2) MPa.

10. A method for operating a desalted water system in a nuclear power plant, characterized in that: The desalted water system operating device for a nuclear power plant according to any one of claims 1 to 9 comprises the following steps: Step 1: Select the operation mode of the desalted water system of the nuclear power plant on the controller; Step 2: The controller controls the operation of the desalted water system of the nuclear power plant according to the selected operation mode of the desalted water system of the nuclear power plant.

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