Nuclear power station heat pipe type passive containment heat export system

Abstract

The utility model relates to a nuclear power station heat pipe type passive containment heat export system. At present, an existing passive containment heat export system is complex in arrangement, and a water tank and other equipment need to be maintained for a long time. The nuclear power station heat pipe type passive containment heat export system comprises a containment (9), and a demineralized water make-up pump (1), a water make-up pipeline (2), a containment inner heat pipe absorption section (3), a heat pipe mother pipe electric stop valve (4), a heat pipe vacuumizing pipeline (7) and a heat pipe vacuumizing pump (8) are installed in the containment. The water replenishing pipeline and the heat pipe vacuumizing pipeline are respectively connected with a heat pipe cooling section mother pipe (5); the heat pipe cooling section mother pipe is provided with a heat pipe mother pipe electric stop valve, one end of the heat pipe cooling section mother pipe is connected with a group of containment inner heat pipe absorption sections, and the other end of the heat pipe cooling section mother pipe is connected with a containment outer heat pipe absorption section (6). The utility model is applied to the field of passive containment heat export systems.

Description

Technical Field

[0001] The utility model relates to a heat pipe type passive containment heat extraction system for a nuclear power station. Background Art

[0002] In order to improve the safety factor in the event of an accident in a nuclear power plant, if there is no containment heat removal system to conduct the heat in the containment to the outside of the containment when an accident occurs in a nuclear power plant, it may cause the containment to overheat and overpressure, which may cause the containment to lose its function and cause radioactive substances to leak into the atmosphere, leading to nuclear leakage.

[0003] The existing passive containment heat removal system usually includes a series of heat exchangers, pipes, valves and other equipment. The system settings are relatively complex. At the same time, a water tank with a volume of more than 1000m3 needs to be installed around the containment, which increases the investment cost and requires long-term maintenance of the water tank and other equipment to prevent functional failure or boundary damage, which reduces safety performance. Summary of the invention

[0004] The purpose of the utility model is to provide a heat pipe type passive containment heat removal system for a nuclear power plant, so as to avoid overheating and overpressure of the containment, which may cause the loss of the containment function, leakage of radioactive substances into the atmosphere, and result in nuclear leakage.

[0005] The above purpose is achieved through the following technical solutions:

[0006] A heat pipe type passive containment heat extraction system for a nuclear power plant, comprising: a containment, wherein a desalted water replenishment pump, a water replenishment pipeline, a heat pipe absorption section in the containment, a heat pipe mother pipe electric stop valve, a heat pipe vacuuming pipeline and a heat pipe vacuuming pump are installed in the containment, wherein the water replenishment pipeline and the heat pipe vacuuming pipeline are respectively connected to the heat pipe cooling section mother pipe;

[0007] The heat pipe cooling section mother pipe is installed with the heat pipe mother pipe electric stop valve, one end of the heat pipe cooling section mother pipe is connected to a group of heat pipe absorption sections inside the containment, and the other end is connected to the heat pipe absorption section outside the containment.

[0008] In the heat pipe type passive containment heat extraction system for a nuclear power plant, a heat pipe vacuum pump is installed on the heat pipe vacuum pipeline.

[0009] In the heat pipe type passive containment heat extraction system for a nuclear power plant, a desalted water make-up pump is installed on the make-up water pipeline. Beneficial Effects

[0010] 1. When an accident occurs in a nuclear power plant, the passive containment heat extraction system of the utility model can quickly transfer the heat generated inside the containment to the external environment, thereby reducing the temperature of the reactor and preventing the containment from being damaged or melted due to excessive temperature. At the same time, the system can also prevent heat from accumulating inside the containment and generating pressure, thereby destroying the integrity of the containment. The passive containment heat extraction system is an important part of a nuclear power plant. Its function is to protect the reactor and the containment. When an accident occurs, it can quickly and effectively extract heat to ensure the safety and reliability of the nuclear power plant.

[0011] 2. The heat pipe type passive containment heat removal system of the utility model is used for long-term heat removal of the containment under conditions such as beyond-design basis accidents or severe accidents (including accidents related to power outages in the entire plant and failures of the spray system), reducing the pressure and temperature of the nuclear power plant containment to an acceptable level and maintaining the integrity of the containment.

[0012] 3. Compared with the water tank type passive containment heat extraction system, the heat pipe type passive containment heat extraction system of the utility model has the characteristics of simple system, small size, light weight, simple structure, few parts, no need to set up a water tank, and reduced investment cost. It reduces the load on the top of the containment and improves the safety of the containment; the heat exchange is efficient, and the heat pipe heat exchanger uses the working medium circulation in the heat pipe to realize the heat transfer, and has a higher heat exchange efficiency than the tube wall heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Attached Figure 1 It is a structural schematic diagram of the utility model.

[0014] Attached Figure 2 It is a schematic diagram of the connection between the main pipe of the heat pipe cooling section and the heat pipe absorption section inside and outside the containment.

[0015] In the figure: 1. Desalted water make-up pump, 2. Make-up pipe, 3. Heat pipe absorption section in containment, 4. Heat pipe mother pipe electric stop valve, 5. Heat pipe cooling section mother pipe, 6. Heat pipe absorption section outside containment, 7. Heat pipe vacuum pipe, 8. Heat pipe vacuum pump. 9. Containment. DETAILED DESCRIPTION Example

[0016] A heat pipe type passive containment heat extraction system for a nuclear power plant, comprising: a containment 9, in which a desalted water replenishment pump 1, a replenishment pipe 2, a heat pipe absorption section 3 in the containment, a heat pipe mother pipe electric stop valve 4, a heat pipe vacuum pipe 7 and a heat pipe vacuum pump 8 are installed respectively, and the replenishment pipe and the heat pipe vacuum pipe are respectively connected to the heat pipe cooling section mother pipe 5;

[0017] The heat pipe cooling section mother pipe is installed with the heat pipe mother pipe electric shut-off valve. One end of the heat pipe cooling section mother pipe is connected to a group of heat pipe absorption sections inside the containment, and the other end is connected to the heat pipe absorption section 6 outside the containment.

[0018] In the heat pipe type passive containment heat extraction system for a nuclear power plant, a heat pipe vacuum pump is installed on the heat pipe vacuum pipeline.

[0019] In the heat pipe type passive containment heat extraction system for a nuclear power plant, a desalted water make-up pump is installed on the make-up water pipeline.

[0020] When the temperature in the containment increases, the water in the heat pipe heat absorption section 3 in the containment absorbs heat and evaporates, taking away the temperature in the containment. The evaporated steam passes through the heat pipe mother pipe electric stop valve 4 and then flows through the heat pipe cooling section mother pipe 5 to be distributed to the cooling section 6 outside the containment for cooling and condensation, and then condenses into water and flows back to the heat pipe heat absorption section 3 in the containment. In this process, the cycle is completed and the heat in the containment is discharged. When there is a lack of water in the heat pipe, water is replenished through the water replenishment pipe 2 by the water replenishment pump 1. When the vacuum in the heat pipe is insufficient, the gas in the heat pipe is extracted through the vacuum pump 8 through the vacuum extraction pipe 7 to achieve internal vacuum.

Claims

1. A heat pipe type passive containment heat removal system for a nuclear power plant, comprising: A containment shell is provided with a desalted water replenishment pump, a water replenishment pipeline, a heat pipe absorption section in the containment shell, a heat pipe mother pipe electric stop valve, a heat pipe vacuum pipeline and a heat pipe vacuum pump. The containment shell is characterized in that: the water replenishment pipeline and the heat pipe vacuum pipeline are respectively connected to the heat pipe cooling section mother pipe; the heat pipe mother pipe electric stop valve is installed on the heat pipe cooling section mother pipe; one end of the heat pipe cooling section mother pipe is connected to a group of heat pipe absorption sections in the containment shell, and the other end is connected to the heat pipe absorption section outside the containment shell.

2. The heat pipe passive containment heat removal system for a nuclear power plant according to claim 1 is characterized by: A heat pipe vacuum pump is installed on the heat pipe vacuum pipeline.

3. The heat pipe passive containment heat removal system for a nuclear power plant according to claim 1 is characterized by: A desalted water replenishment pump is installed on the water replenishment pipeline.

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