Simulation test device for arranging cold water system on main pump of nuclear power station

Abstract

The invention belongs to the technical field of nuclear reactor system design and operation, and particularly relates to a nuclear power station main pump cold water system simulation test device. The top of the water storage pond is connected with a water inlet, the bottom of the water storage pond is connected with a discharge port, the top of the water storage pond is connected with a third manual stop valve, the bottom of the water storage pond is connected with a pump, and an outlet of the pump is connected with two pipelines. The method has the beneficial effects that on the basis of not influencing the normal operation of the nuclear power station, the in-depth research on the operation characteristics of the main pump cold water system can be realized; comprising but not limited to influence research on cold water inlet temperature, influence research on cold water pressure, influence research on cold water flow, influence research on system local resistance and the like.

Description

Technical Field

[0001] The invention belongs to the technical field of nuclear reactor system design and operation, and in particular relates to a simulation test device for a main pump cooling water system of a nuclear power plant. Background Art

[0002] The main pump in a nuclear power plant is a pump used to circulate coolant within the reactor coolant system (RCP) within the primary circuit system of the nuclear island. It is a critical component of nuclear power plant operation, controlling the water circulation and representing a primary component of the plant. During normal operation, the high-speed rotation of mechanical components generates significant heat. Heat exchange with the main pump's cooling water system maintains a relatively stable operating temperature. However, abnormalities such as flow fluctuations in the main pump's cooling water system can prevent the pump's heat from being dissipated promptly, leading to elevated pump temperatures and threatening the safe and stable operation of the equipment.

[0003] Studying the main pump chilled water system helps to understand the operating characteristics of the system, thereby achieving precise control of the main pump chilled water system. Summary of the Invention

[0004] The present invention provides a simulation test device for a nuclear power plant's main pump chiller system. This device can be used to replicate the actual operating conditions of the system and adjust test parameters for specific operating conditions, such as temperature, pressure, and flow, according to research needs. Using this simulation test device for testing allows for in-depth research into the operating characteristics of the main pump chiller system without affecting the normal operation of the nuclear power plant.

[0005] The technical solution of the present invention is as follows: A nuclear power plant main pump cold water system simulation test device includes a water storage tank, a heat exchanger and a pump, a plurality of manual stop valves, electric stop valves, electric regulating valves and a venturi tube, wherein the top of the water storage tank is connected to the water inlet, the bottom of the water storage tank is connected to the discharge outlet, the top of the water storage tank is connected to the third manual stop valve, the bottom of the water storage tank is connected to the pump, the pump outlet is connected to two pipelines, one of which is provided with a ninth electric regulating valve, the ninth electric regulating valve is connected to the first venturi tube, the first venturi tube is connected to the upper part of the water storage tank, the other pipeline of the pump outlet is divided into two pipelines, one of which is connected to the second electric stop valve, the eighth electric regulating valve and the eighth venturi tube in sequence, the other pipeline of the first electric regulating valve is divided into A pipeline is connected to a first electric stop valve, and the first electric stop valve branches out into 6 parallel pipelines, wherein the first pipeline is connected in series with a second electric regulating valve and a second venturi tube, the second pipeline is connected in series with a third electric regulating valve and a third venturi tube, the third pipeline is connected in series with a fourth electric regulating valve and a fourth venturi tube, the fourth pipeline is connected in series with a fifth electric regulating valve and a fifth venturi tube, the fifth pipeline is connected in series with a sixth electric regulating valve and a sixth venturi tube, the sixth pipeline is connected in series with a seventh electric regulating valve and a seventh venturi tube, the second venturi tube, the third venturi tube, the fourth venturi tube, the fifth venturi tube, the sixth venturi tube, the seventh venturi tube and the eighth venturi tube converge at the inlet of the heat exchanger through pipelines, and the heat exchanger is connected to the top of the water storage tank.

[0006] The other pipeline of the pump outlet is divided into two pipelines through a first electric regulating valve.

[0007] The top of the water storage tank is connected to the water inlet through a first manual stop valve.

[0008] The bottom of the water storage tank is connected to the discharge outlet through a second manual stop valve.

[0009] The top of the water tank is also connected to a third manual stop valve.

[0010] The third manual stop valve is an exhaust valve on the top of the water tank.

[0011] A fourth manual stop valve is provided on the pipeline between the pump and the water tank.

[0012] A pressure measuring device is provided at the outlet of the heat exchanger, a pressure measuring device is provided at the outlet of the first venturi tube, a pressure measuring device is provided at the outlet of the first electric control valve, a pressure measuring device is provided at the inlet of the second electric stop valve and the first electric stop valve, a pressure measuring device is provided at the inlet of the second electric control valve, the third electric control valve, the fourth electric control valve, the fifth electric control valve and the seventh electric control valve, and a pressure measuring device is provided at the outlet of the second venturi tube, the third venturi tube, the fourth venturi tube, the fifth venturi tube, the seventh venturi tube and the eighth venturi tube.

[0013] The beneficial effect of the present invention is that the present invention can be used to achieve in-depth research on the operating characteristics of the main pump cooling water system without affecting the normal operation of the nuclear power plant, including but not limited to the influence study of the cooling water inlet temperature, the influence study of the cooling water pressure, the influence study of the cooling water flow, the influence study of the local resistance of the system, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of a nuclear power plant main pump cooling water system simulation test device provided by the present invention.

[0015] In the figure: 1, water tank, 2, water inlet, 3, first manual stop valve, 4, second manual stop valve, 5, discharge outlet, 6, heat exchanger, 7, third manual stop valve, 8, pump, 9, fourth manual stop valve, 10, ninth electric regulating valve, 11, first venturi tube, 12, first electric regulating valve, 13, second electric stop valve, 14, eighth electric regulating valve, 15, eighth venturi tube, 16, first electric stop valve, 17, second electric regulating valve, 18, second venturi tube, 19, third electric regulating valve, 20, third venturi tube, 21, fourth electric regulating valve, 22, fourth venturi tube, 23, fifth electric regulating valve, 24, fifth venturi tube, 25, sixth electric regulating valve, 26, sixth venturi tube, 27, seventh electric regulating valve, 28, seventh venturi tube. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to examples. The exemplary embodiments of the present invention and their descriptions are only used to explain the present invention and are not intended to limit the present invention.

[0017] A nuclear power plant main pump chiller system simulation test device includes a pump, a water reservoir, a heat exchanger, a flow meter, and several control valves. The water reservoir is used to replenish and drain the system while maintaining the basic liquid level for system operation; the pump provides power for system operation; the heat exchanger heats and cools the system's working fluid; and the regulating valve controls the flow rate in each pipeline while simulating different flow resistances. The number of test pipelines in this invention is not limited to a specific value; it can be increased or decreased based on the actual chiller system being simulated.

[0018] like Figure 1 As shown, a nuclear power plant main pump cold water system simulation test device includes a water tank, a heat exchanger and a pump, a plurality of manual stop valves, electric stop valves, electric regulating valves and a venturi tube, wherein the top of the water tank 1 is connected to the water inlet 2 through a first manual stop valve 3, the bottom of the water tank 1 is connected to the discharge outlet 5 through a second manual stop valve 4, the top of the water tank 1 is also connected to a third manual stop valve 7, the third manual stop valve 7 is the exhaust valve at the top of the water tank, the bottom of the water tank 1 is connected to the pump 8 through a pipeline, a fourth manual stop valve 9 is provided on the pipeline between the pump 8 and the water tank 1, the outlet of the pump 8 is connected to two pipelines, one of which is provided with an eighth electric regulating valve 10, the eighth electric regulating valve 10 is connected to the first venturi tube 11, the first venturi tube 11 is connected to the upper part of the water tank 1 through a pipeline, the other pipeline of the pump 8 outlet is divided into two pipelines through the first electric regulating valve 12, one of which is connected to the second electric stop valve 13 and the eighth electric stop valve 14 in sequence on the pipeline. The electric regulating valve 14 and the eighth venturi tube 15 are connected in series. Another pipeline branched from the first electric regulating valve 12 is connected to the first electric stop valve 16. The first electric stop valve branches out 6 parallel pipelines, wherein the first pipeline is connected in series with the second electric regulating valve 17 and the second venturi tube 18, the second pipeline is connected in series with the third electric regulating valve 19 and the third venturi tube 20, the third pipeline is connected in series with the fourth electric regulating valve 21 and the fourth venturi tube 22, and the fourth pipeline is connected in series with the fifth electric regulating valve 23 and the fifth venturi tube 24, the fifth pipeline is connected in series with a sixth electric regulating valve 25 and a sixth venturi tube 26, the sixth pipeline is connected in series with a seventh electric regulating valve 27 and a seventh venturi tube 28, the second venturi tube 18, the third venturi tube 20, the fourth venturi tube 22, the fifth venturi tube 24, the sixth venturi tube 26, the seventh venturi tube 28 and the eighth venturi tube 15 are converged at the inlet of the heat exchanger 6 through the pipeline, and the heat exchanger 6 is connected to the top of the water storage tank 1 through the pipeline.

[0019] like Figure 1As shown in the figure, PE represents a pressure measuring point and PdE represents a differential pressure measuring point. Specifically, a pressure measuring device is provided at the outlet of the heat exchanger 6, a pressure measuring device is provided at the outlet of the first venturi tube 11, a pressure measuring device is provided at the outlet of the first electric control valve 12, a pressure measuring device is provided at the inlet of the second electric stop valve 13 and the first electric stop valve 16, a pressure measuring device is provided at the inlet of the second electric control valve 17, the third electric control valve 19, the fourth electric control valve 21, the fifth electric control valve 23, the sixth electric control valve 25, and the seventh electric control valve, and a pressure measuring device is provided at the outlet of the second venturi tube 18, the third venturi tube 20, the fourth venturi tube 22, the fifth venturi tube 24, the seventh venturi tube 28, and the eighth venturi tube 15.

[0020] by Figure 1 Taking column B-1 as an example, PE101 is the pressure upstream of the TV-1 valve, PE102 is the pressure at the end of the branch, and PdE101 is the pressure difference between the TV-1 valve and the end of the branch.

[0021] The key points of the present invention are:

[0022] (1) Composition of the simulation test device. Figure 1 As shown, the simulation test device of the present invention is mainly composed of a pump, a water storage tank, a heat exchanger, a flow meter and several control valves. At the same time, the number of its test pipelines can be increased or decreased according to the actual cold water system to be simulated.

[0023] (2) Functions of the simulation test device. This simulation test device can reproduce the actual operating parameters of the nuclear power plant's main pump chiller system, and can also adjust specific temperature, pressure, and flow parameter conditions. At the same time, by controlling the opening of the regulating valve and monitoring the pressure difference, it can simulate any local resistance characteristics.

[0024] The technical solution provided by the present invention is further described below with reference to the accompanying drawings:

[0025] (1) First, build the main pump cold water system simulation test device according to the diagram. The equipment models and parameters of the pump, water storage tank, heat exchanger, and flow meter need to be determined according to the actual test working conditions. The number and diameter of each branch pipe need to be determined according to the number and diameter of the cold water system pipes actually set on site.

[0026] (2) Control pump frequency and main valve ( Figure 1 TV-1 and TV-2) in the middle to adjust the system flow and pressure;

[0027] (3) Control the heat exchanger power to adjust the working fluid temperature in the system;

[0028] (4) Control the opening of each branch regulating valve to adjust the flow of each branch, or simulate different local resistance characteristics;

[0029] (5) After the temperature, pressure, flow and other parameters reach the set operating conditions, collect test data for analysis to obtain the operating characteristics of the main pump chilled water system under specific conditions.

Claims

1. A nuclear power plant main pump cold water system simulation test device, characterized by: The utility model comprises a water storage tank, a heat exchanger and a pump, a plurality of manual stop valves, an electric stop valve, an electric regulating valve and a venturi tube, wherein the top of the water storage tank is connected to the water inlet, the bottom of the water storage tank is connected to the discharge outlet, the top of the water storage tank is connected to the third manual stop valve, the bottom of the water storage tank is connected to the pump, the outlet of the pump is connected to two pipelines, one of which is provided with a ninth electric regulating valve, the ninth electric regulating valve is connected to the first venturi tube, the first venturi tube is connected to the upper part of the water storage tank, the other pipeline of the pump outlet is divided into two pipelines, one of which is connected to the second electric stop valve, the eighth electric regulating valve and the eighth venturi tube in sequence, the other pipeline divided from the first electric regulating valve is connected to the first electric stop valve, the ninth electric regulating valve is connected to the first venturi tube ... An electric stop valve branches out into six parallel pipelines, wherein the first pipeline is connected in series with a second electric regulating valve and a second venturi tube, the second pipeline is connected in series with a third electric regulating valve and a third venturi tube, the third pipeline is connected in series with a fourth electric regulating valve and a fourth venturi tube, the fourth pipeline is connected in series with a fifth electric regulating valve and a fifth venturi tube, the fifth pipeline is connected in series with a sixth electric regulating valve and a sixth venturi tube, and the sixth pipeline is connected in series with a seventh electric regulating valve and a seventh venturi tube. The second, third, fourth, fifth, sixth, seventh and eighth venturi tubes converge at the inlet of a heat exchanger through pipelines, and the heat exchanger is connected to the top of a water storage tank.

2. A nuclear power plant main pump cold water system simulation test device according to claim 1, characterized in that: The other pipeline of the pump outlet is divided into two pipelines through a first electric regulating valve.

3. A nuclear power plant main pump cold water system simulation test device according to claim 1, characterized in that: The top of the water storage tank is connected to the water inlet through a first manual stop valve.

4. A nuclear power plant main pump cold water system simulation test device according to claim 1, characterized in that: The bottom of the water storage tank is connected to the discharge outlet through a second manual stop valve.

5. A nuclear power plant main pump cold water system simulation test device according to claim 1, characterized in that: The top of the water tank is also connected to a third manual stop valve.

6. A nuclear power plant main pump cold water system simulation test device according to claim 1, characterized in that: The third manual stop valve is an exhaust valve on the top of the water tank.

7. A nuclear power plant main pump cold water system simulation test device according to claim 1, characterized in that: A fourth manual stop valve is provided on the pipeline between the pump and the water tank.

8. A nuclear power plant main pump cold water system simulation test device according to claim 1, characterized in that: A pressure measuring device is provided at the outlet of the heat exchanger, a pressure measuring device is provided at the outlet of the first venturi tube, a pressure measuring device is provided at the outlet of the first electric control valve, a pressure measuring device is provided at the inlet of the second electric stop valve and the first electric stop valve, a pressure measuring device is provided at the inlet of the second electric control valve, the third electric control valve, the fourth electric control valve, the fifth electric control valve and the seventh electric control valve, and a pressure measuring device is provided at the outlet of the second venturi tube, the third venturi tube, the fourth venturi tube, the fifth venturi tube, the seventh venturi tube and the eighth venturi tube.

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