CN214043100U

CN214043100U - Main loop zinc adding system of pressurized-water nuclear power station

Info

Publication number: CN214043100U
Application number: CN202022545662.0U
Authority: CN
Inventors: 宋晓辉; 杨志舒; 吴迎坤
Original assignee: Shenzhen Cm Electric Power Technology Co ltd
Current assignee: Shenzhen Cm Electric Power Technology Co ltd
Priority date: 2020-11-06
Filing date: 2020-11-06
Publication date: 2021-08-24
Anticipated expiration: 2030-11-06

Abstract

A main loop zinc adding system of a pressurized-water nuclear power station comprises a first stirrer, a second stirrer, a dosing tank, a heater, a dosing barrel, a dosing pump, a waste liquid pool, a liquid return loop and a dosing pipeline; the first stirrer and the heater are arranged in the dosing tank, the second stirrer is arranged in the dosing tank, a liquid inlet of the dosing tank is connected with the first desalting water pipe, a liquid outlet of the dosing tank is connected with a first liquid inlet of the dosing tank through a dosing pump, a second liquid inlet of the dosing tank is connected with the second desalting water pipe, a liquid return port of the dosing tank is connected with the RCP system through a liquid return loop and a third electric valve, and a waste liquid port of the dosing tank is connected with the waste liquid pool; the medicine adding pipeline comprises a first main pipe, a second main pipe and two branch pipes which are connected in parallel, one end of the first main pipe is connected with the liquid outlet of the medicine adding tank, the other end of the first main pipe is connected with the inlets of the two branch pipes respectively, the outlets of the two branch pipes are connected with the inlet of the second main pipe respectively, and the outlet of the second main pipe is connected with the RCP system; each branch pipe is provided with a first electric valve, a metering pump, a flowmeter, a check valve and a second electric valve in sequence along the flowing direction of liquid.

Description

Main loop zinc adding system of pressurized-water nuclear power station

Technical Field

The utility model relates to a nuclear power technical field especially relates to a pressurized-water nuclear power station major loop adds zinc system.

Background

Nuclear power plants generally have a primary loop system, the primary loop system in a pressurized water reactor is a reactor coolant system (RCP), neutrons generated in the fission process of a nuclear power plant reactor can irradiate primary loop coolant and corrosives, control rods and other materials to generate some activation products, such as H3, Mn54, Fe59, Co58, Co60, Ag110m, Sb124 and the like, the content of the activation products is closely related to the radiation dose in the system, and the activation products have great influence on equipment safety, equipment life and personnel safety. In the commercial operation of nuclear power plants, zinc is generally injected into the main loop system, and as zinc is injected into the main loop system, the existing corrosion film oxide on the surface of the main loop system becomes more stable and more protective, so that the overall and local corrosion can be inhibited, but the challenges in the field are still presented in how to reduce the radiation dose of the system in a shorter time, improve the working environment of equipment and operators and reduce the operation cost.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the technical problem that will solve is: a main loop zinc adding system of a pressurized water nuclear power station is provided.

The technical problem of the utility model is solved through following technical scheme:

a main loop zinc adding system of a pressurized water nuclear power station comprises a first stirrer, a dosing tank, a heater, a second stirrer, a dosing barrel, a dosing pump, a waste liquid pool, a liquid return loop and a dosing pipeline;

the first stirrer is arranged in the dosing tank and used for stirring liquid in the dosing tank, the heater is used for heating the liquid in the dosing tank, the second stirrer is arranged in the dosing barrel and used for stirring the liquid in the dosing barrel, a liquid inlet of the dosing barrel is connected with a first demineralized water pipe, a liquid outlet of the dosing barrel is connected with a first liquid inlet of the dosing tank through the dosing pump, a second liquid inlet of the dosing tank is connected with a second demineralized water pipe, a liquid return port of the dosing tank is used for being connected with a reactor coolant system through the liquid return loop, and a waste liquid port of the dosing tank is connected with the waste liquid pool; the medicine adding pipeline comprises a first main pipe, a second main pipe and two branch pipes connected in parallel, one end of the first main pipe is connected with a liquid outlet of the medicine adding tank, the other end of the first main pipe is connected with inlets of the two branch pipes respectively, outlets of the two branch pipes are connected with an inlet of the second main pipe respectively, and an outlet of the second main pipe is used for being connected with a reactor coolant system; a first electric valve, a metering pump, a flow meter, a check valve and a second electric valve are sequentially arranged on each branch pipe along the flowing direction of liquid; and a third electric valve is arranged on the liquid return loop.

Preferably, the first main pipe is further provided with a fourth electric valve, and the second main pipe is further provided with a fifth electric valve.

Preferably, a sixth electric valve is connected between the dosing pump and the first liquid inlet of the dosing tank; a seventh electric valve is connected between the waste liquid port of the dosing tank and the waste liquid pool; an eighth electric valve is arranged on the first demineralized water pipe and is connected with a liquid inlet of the dosing barrel; and a ninth electric valve is arranged on the second demineralized water pipe and is connected with the liquid inlet of the dosing tank.

Preferably, the liquid level detector is used for detecting the liquid level in the medicine adding tank, and the temperature detector is used for detecting the liquid temperature in the medicine adding tank.

Preferably, the system further comprises a control system, and the temperature detector, the liquid level detector, the flow meter, the metering pump, the dosing pump, the heater, all stirrers and all electric valves are controlled by the control system.

Preferably, each branch pipe further comprises a pressure gauge, and the pressure gauge is connected with the flowmeter.

Preferably, the medicament in the medicament adding barrel is zinc acetate.

The beneficial effects of the utility model include:

the utility model discloses an in the system, set up two parallelly connected medicine branch pipes that add in the medicine pipeline, one uses one and is equipped with, both conveniently wash the maintenance and can guarantee again that emergency down system can normally work, the liquid return circuit of setting can increase system mobility, prevents that the liquid medicine from deposiing in adding the medicine pipeline, carries out twice mixed stirring in adding the medicinal cupping and adding the explosive barrel, can fully dilute the medicament and exert its maximum effect, the utility model discloses a thereby the system can add the radiation dose that can reduce system in short time with the medicine in short time, improve equipment and operation personnel's operational environment. Furthermore, the control system can control and adjust the dosing quantity, the dosing time, the dosing concentration and the like in real time, and the optimal matching of cost and effect can be realized.

Drawings

Fig. 1 is a block diagram of a main loop zinc adding system of a pressurized water nuclear power station according to an embodiment of the present invention.

Fig. 2 is a schematic diagram of a control system in a main loop zinc adding system of a pressurized water nuclear power station in the specific embodiment of the present invention.

Detailed Description

The invention will be further described with reference to the accompanying drawings and preferred embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

It should be noted that the terms of orientation such as left, right, up, down, top and bottom in the present embodiment are only relative concepts to each other or are referred to the normal use state of the product, and should not be considered as limiting.

As shown in figure 1, the main loop zinc adding system of the pressurized water nuclear power station comprises a first stirrer 6, a dosing tank 1, a heater 7, a second stirrer 5, a dosing barrel 2, a dosing pump 3, a waste liquid pool 4, a liquid return loop 11, a liquid level detector 10 for detecting the liquid level in the dosing tank, a temperature detector 20 for detecting the temperature of liquid in the dosing tank and a dosing pipeline. The reactor comprises a dosing tank 1, a first stirrer 6, a heater 7, a second stirrer 5, a first desalting water pipe 28, a second desalting water pipe 29, a reactor coolant system (RCP system) and a waste liquid tank 4, wherein the first stirrer 6 is arranged in the dosing tank 1 and used for stirring liquid in the dosing tank, the heater 7 is used for heating liquid in the dosing tank 1, the second stirrer 5 is arranged in the dosing tank 2 and used for stirring liquid in the dosing tank, a liquid inlet of the dosing tank 2 is connected with the first desalting water pipe 28, a liquid outlet of the dosing tank 2 is connected with a first liquid inlet of the dosing tank 1 through a dosing pump 3, a second liquid inlet of the dosing tank is connected with the second desalting water pipe 29, a liquid return port of the dosing tank 1 is connected with the reactor coolant system (RCP system) through a liquid return loop 11, and a waste liquid port of the dosing tank 1 is connected with the waste liquid pool 4; the medicine adding pipeline comprises a first main pipe 8, a second main pipe 12 and two branch pipes 9 connected in parallel, one end of the first main pipe 8 is connected with a liquid outlet of the medicine adding tank 1, the other end of the first main pipe is connected with inlets of the two branch pipes 9 respectively, outlets of the two branch pipes 9 are connected with an inlet of the second main pipe 12 respectively, and an outlet of the second main pipe 12 is used for connecting the RCP system; a first electric valve 14, a metering pump 15, a flow meter 17, a check valve 18 and a second electric valve 19 are sequentially arranged on each branch pipe 9 along the flowing direction of liquid, and the flow meter 17 is also connected with a pressure gauge 16; a third electric valve 26 is arranged on the liquid return loop 11, a fourth electric valve 13 is arranged on the first main pipe 8, a fifth electric valve 27 is arranged on the second main pipe 8, and a sixth electric valve 22 is connected between the dosing pump 3 and the first liquid inlet of the dosing tank 1; a seventh electric valve 21 is connected between the waste liquid port of the dosing tank 1 and the waste liquid pool 4; the eighth electric valve 25 is arranged on the first desalting water pipe 28 and connected with the liquid inlet of the dosing barrel 2, and the ninth electric valve 23 is arranged on the second desalting water pipe 29 and connected with the liquid inlet of the dosing tank 1.

As shown in fig. 2, the main loop zinc adding system of the pressurized-water nuclear power station further comprises a control system, and the temperature detector 20, the two flow meters 17, the two metering pumps 15, the dosing pump 3, the heater 7, all the stirrers (i.e., the second stirrer 5 and the first stirrer 6) and all the electric valves (i.e., the first to ninth electric valves) are controlled by the control system.

Through the main loop zinc adding system of the pressurized water nuclear power station in the specific embodiment, proper zinc acetate can be added into an RCP system to form a compact oxide film on the surface of a main loop, contact between a pipeline and water in the main loop is effectively isolated, the dosage of radionuclide increased due to corrosion is reduced, when the system works, demineralized water is added into a dosing barrel, zinc acetate medicament in the dosing barrel is stirred and mixed under the action of a second stirrer, the mixed solution enters a dosing tank, the dosing tank and the demineralized water are stirred and mixed for the second time, the mixed solution (usually, the concentration of the zinc acetate is 10-30ppb) is injected into the RCP system from one branch pipe (the other branch pipe is used as a spare to prevent system faults and the like) through a metering pump, and during the work, the zinc adding time, the zinc adding concentration, the total zinc adding amount and the like can be strictly controlled through automatic control of a control system, the added zinc acetate can form a compact and uniform oxide film in the system in the shortest time, so that the radiation dose of the system is reduced in the shortest time, and the working environment of equipment and operators is improved. In actual operation, the control system can have functions of data collection, analysis, control and the like, an optimal control database is established, optimal matching of cost and effect can be achieved, for example, sampling detection (such as radiation detection data and corrosion data) can be performed on an RCP system, the dosage of the system is adjusted according to the detection data, the dosage data can be collected, the database is established to optimize the dosage, and cost is saved.

The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. To the technical field of the utility model belongs to the prerequisite of not deviating from the utility model discloses, can also make a plurality of equal substitution or obvious variants, performance or usage are the same moreover, all should regard as belonging to the utility model's scope of protection.

Claims

1. A main loop zinc adding system of a pressurized-water nuclear power station is characterized by comprising a first stirrer, a dosing tank, a heater, a second stirrer, a dosing barrel, a dosing pump, a waste liquid pool, a liquid return loop and a dosing pipeline;

the first stirrer is arranged in the dosing tank and used for stirring liquid in the dosing tank, the heater is used for heating the liquid in the dosing tank, the second stirrer is arranged in the dosing barrel and used for stirring the liquid in the dosing barrel, a liquid inlet of the dosing barrel is connected with a first demineralized water pipe, a liquid outlet of the dosing barrel is connected with a first liquid inlet of the dosing tank through the dosing pump, a second liquid inlet of the dosing tank is connected with a second demineralized water pipe, a liquid return port of the dosing tank is used for being connected with a reactor coolant system through the liquid return loop, and a waste liquid port of the dosing tank is connected with the waste liquid pool;

the medicine adding pipeline comprises a first main pipe, a second main pipe and two branch pipes connected in parallel, one end of the first main pipe is connected with a liquid outlet of the medicine adding tank, the other end of the first main pipe is connected with inlets of the two branch pipes respectively, outlets of the two branch pipes are connected with an inlet of the second main pipe respectively, and an outlet of the second main pipe is used for being connected with a reactor coolant system;

a first electric valve, a metering pump, a flow meter, a check valve and a second electric valve are sequentially arranged on each branch pipe along the flowing direction of liquid; and a third electric valve is arranged on the liquid return loop.

2. The main loop zinc adding system of the pressurized water nuclear power station of claim 1, characterized in that: the first main pipe is further provided with a fourth electric valve, and the second main pipe is further provided with a fifth electric valve.

3. The main loop zinc adding system of the pressurized water nuclear power station of claim 2, characterized in that: a sixth electric valve is connected between the dosing pump and the first liquid inlet of the dosing tank; a seventh electric valve is connected between the waste liquid port of the dosing tank and the waste liquid pool; an eighth electric valve is arranged on the first demineralized water pipe and is connected with a liquid inlet of the dosing barrel; and a ninth electric valve is arranged on the second demineralized water pipe and is connected with the liquid inlet of the dosing tank.

4. The main loop zinc adding system of the pressurized water nuclear power station as claimed in claim 3, characterized in that: the liquid level detector is used for detecting the liquid level in the medicine adding tank and the temperature detector is used for detecting the liquid temperature in the medicine adding tank.

5. The main loop zinc adding system of the pressurized water nuclear power station of claim 4, characterized in that: the automatic liquid level control system is characterized by further comprising a control system, wherein the temperature detector, the liquid level detector, the flow meter, the metering pump, the dosing pump, the heater, all stirrers and all electric valves are controlled by the control system.

6. The pressurized-water nuclear power plant main circuit zinc adding system according to any one of claims 1 to 5, characterized in that: each branch pipe further comprises a pressure gauge, and the pressure gauge is connected with the flowmeter.

7. The pressurized-water nuclear power plant main circuit zinc adding system according to any one of claims 1 to 5, characterized in that: the medicament in the medicament adding barrel is zinc acetate.