Miniaturized nuclear power emergency diesel generator set fuel delivery system and method

Abstract

The present invention discloses a miniaturized nuclear power emergency diesel generator set fuel delivery system and method, which adopts the delivery switching when two fuel storage tanks deliver fuel to three daily fuel tanks, ensuring that under the condition that the two fuel storage tanks A / B supply fuel to the three daily fuel tanks 1#, 2#, and 3#, the fuel storage tank A can choose to supply fuel to the 1#EDG daily fuel tank or the 2#EDG daily fuel tank, and the fuel storage tank B can choose to supply fuel to the 3#EDG daily fuel tank or the 2#EDG daily fuel tank, thereby realizing the optimal allocation of resources, ensuring that each daily fuel tank can obtain sufficient fuel supply, and avoiding the waste of resources and redundant construction. It not only improves the economic benefits, but also reduces the operating costs.

Description

Technical Field

[0001] The invention belongs to the technical field of nuclear power emergency diesel generator sets, and in particular relates to a fuel delivery system and method for a miniaturized nuclear power emergency diesel generator set. Background Art

[0002] Emergency Diesel Generator (EDG) is an important component of nuclear power plant system equipment. It is the last line of defense to provide power guarantee for key safety systems (such as cooling system, containment isolation system, etc.) when the nuclear power plant loses external power supply, ensuring that the nuclear reactor can be safely shut down and maintain the necessary cooling function to prevent the leakage of radioactive materials. Therefore, the reliability and stability of emergency diesel generator sets are crucial to the safe operation of nuclear power plants.

[0003] As an important part of the emergency diesel generator set, the design and operation of the fuel system require high reliability and flexibility. The fuel storage tank is used to store diesel for a long time in case of emergency; while the daily fuel tank is responsible for supplying fuel to the generator set on a daily basis to ensure the continuous operation of the generator set. In conventional design, each generator set will be equipped with an independent fuel storage tank and daily fuel tank to ensure the independence and reliability of fuel supply. However, in some cases, due to site limitations or cost considerations of nuclear power plants, a more compact fuel system design may be adopted, such as designing a system in which two fuel storage tanks supply fuel to three or more daily fuel tanks. Although this saves space and cost, it requires complex pipeline layout and switching logic. How to ensure that each path does not interfere with each other and can achieve fast and accurate switching under any circumstances is a major challenge in system design. The selection of solenoid valves needs to take into account their pressure resistance, temperature resistance, corrosion resistance and other properties, as well as response time, control accuracy and other requirements. At the same time, the layout of solenoid valves also needs to consider factors such as space limitations and maintenance convenience. In order to improve the reliability of the system, a redundant design is required, such as setting up backup solenoid valves and backup power supplies. However, redundant design will increase the complexity and cost of the system, and balancing reliability and economy is a difficult point. Especially in emergency situations, how to quickly and accurately switch the fuel delivery circuit to ensure that all generator sets can obtain sufficient fuel supply has become an important technical challenge. Summary of the invention

[0004] To solve the above problems, the present invention provides a fuel delivery switching system for a nuclear power emergency diesel generator set, which can switch the fuel delivery circuit according to instructions to ensure that the fuel can be correctly delivered to the daily fuel tank of the corresponding unit.

[0005] To achieve the above purpose, the technical solution of the present invention is as follows:

[0006] A miniaturized nuclear power emergency diesel generator fuel delivery switching system, which is characterized by including:

[0007] At least two fuel storage tanks for storing diesel;

[0008] Three daily fuel tanks, namely 1#EDG daily fuel tank, 2#EDG daily fuel tank and 3#EDG daily fuel tank, are used to provide daily fuel supply to nuclear power emergency diesel generator sets;

[0009] A fuel delivery pipeline connecting the fuel storage tank and the daily fuel tank;

[0010] At least six explosion-proof solenoid valves are respectively arranged on the fuel delivery pipeline, and one explosion-proof solenoid valve is arranged on the delivery channel from each fuel storage tank to each fuel daily tank, for controlling the delivery direction of the fuel;

[0011] A control device, connected to each channel explosion-proof solenoid valve, for receiving the start and stop status signal of the nuclear power emergency diesel generator set and controlling the switch state of the explosion-proof solenoid valve to realize automatic switching of fuel delivery;

[0012] The manual control mechanism is respectively connected to the explosion-proof solenoid valve of each channel and is used for manually switching the fuel delivery path when the automatic control fails.

[0013] Furthermore, the control device is designed with an interlocking logic of the solenoid valves of each channel to ensure that at any time, each daily fuel tank is supplied with fuel by only one fuel storage tank, while avoiding conflicts in the fuel delivery path.

[0014] Furthermore, the control device can automatically select the fuel storage tank to supply fuel to the corresponding daily fuel tank according to the start / stop status signal of the unit, including: fuel storage tank A selects to supply fuel to 1#EDG daily fuel tank or 2#EDG daily fuel tank, and fuel storage tank B selects to supply fuel to 3#EDG daily fuel tank or 2#EDG daily fuel tank.

[0015] Furthermore, the manual control mechanism includes an operating handle or a switch, which can directly control the opening or closing of the solenoid valve to achieve manual switching of the fuel delivery path.

[0016] On the other hand, the present invention also provides a method for switching fuel delivery using the above-mentioned miniaturized nuclear power emergency diesel generator set fuel delivery switching system, which is characterized in that it includes the steps of:

[0017] S1. Receive the start and stop status signal of the nuclear power emergency diesel generator set;

[0018] S2. According to the start-stop status signal, select and control the corresponding explosion-proof solenoid valve to open or close, so as to realize the fuel supply from the fuel storage tank to the corresponding fuel daily tank.

[0019] Furthermore, the method also includes: in the case of failure of automatic control, manually switching the fuel delivery path through a manual control mechanism.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1) By installing an explosion-proof solenoid valve on the pipeline between the fuel storage tank and the daily fuel tank, and equipping it with a control device and a manual control mechanism, the flexible switching of the fuel delivery path is achieved. This not only ensures the continuity of the fuel supply, but also improves the reliability of the system. In the event of unit start-up, shutdown or failure, the system can respond quickly and adjust the fuel delivery path to ensure that the nuclear power emergency diesel generator set always has sufficient fuel supply, thereby maintaining its stable operation.

[0022] 2) The integrated design of the control device and the solenoid valve realizes the automatic control of fuel delivery. The system can automatically select and control the corresponding solenoid valve to open or close according to the start-stop status signal of the unit, and can complete the switching of the fuel delivery path without human intervention. It not only improves work efficiency, but also reduces the possibility of human operation errors, further improving the safety and reliability of the system.

[0023] 3) In extreme cases, such as when automatic control fails or the system fails, the manual control mechanism provides the operator with a direct means of intervention. By operating the manual control mechanism such as the handle or switch, the operator can quickly switch the fuel delivery path to ensure the normal operation of the nuclear power emergency diesel generator set. This design enhances the emergency response capability of the system and provides a strong guarantee for the safe operation of the nuclear power plant.

[0024] 4) In the case of site restrictions or cost considerations, a special design of two fuel storage tanks supplying fuel to three daily fuel tanks is adopted to achieve optimal allocation of resources. Through reasonable pipeline layout and switching logic design, it can ensure that each daily fuel tank can get sufficient fuel supply, while avoiding waste of resources and redundant construction. It not only improves economic benefits, but also reduces operating costs.

[0025] 5) The fuel delivery switching system of the present invention can effectively reduce the risk of nuclear reactor shutdown caused by diesel unit shutdown. In an emergency, the system can quickly switch the fuel supply path to ensure that key equipment is continuously powered, thereby ensuring the safe operation of the nuclear power plant. It is suitable for emergency diesel generator sets for nuclear power plants or other diesel generator systems with high reliability requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of a fuel delivery switching system for a nuclear power emergency diesel generator set according to an embodiment of the present invention. DETAILED DESCRIPTION

[0027] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, in order to provide a clearer understanding of the structure and use of the present invention, but this should not be used to limit the scope of protection of the present invention.

[0028] A miniaturized fuel transportation switching system for a nuclear power emergency diesel generator set comprises: at least two fuel storage tanks for storing diesel; three daily fuel tanks, namely, 1#EDG daily fuel tank, 2#EDG daily fuel tank and 3#EDG daily fuel tank, for providing daily fuel supply to the nuclear power emergency diesel generator set; a fuel transportation pipeline connecting the fuel storage tanks with the daily fuel tanks; at least six explosion-proof solenoid valves, respectively arranged on the fuel transportation pipeline, and one explosion-proof solenoid valve is arranged on the transportation channel from each fuel storage tank to each daily fuel tank, for controlling the transportation direction of the fuel; a control device, respectively connected to the explosion-proof solenoid valves of each channel, for receiving the start-stop state signal of the nuclear power emergency diesel generator set and controlling the switch state of the explosion-proof solenoid valve, so as to realize automatic switching of fuel transportation; a manual control mechanism, respectively connected to the explosion-proof solenoid valves of each channel, for manually switching the fuel transportation path when the automatic control fails.

[0029] See also Figure 1 , Figure 1 It is a schematic diagram of the fuel delivery switching system of the nuclear power emergency diesel generator set according to an embodiment of the present invention. As shown in the figure, this embodiment uses two fuel storage tanks to supply oil to three daily fuel tanks. An explosion-proof solenoid valve 1 is provided on the connecting pipe connecting the fuel storage tank A and the 1#EDG daily fuel tank, an explosion-proof solenoid valve 2 is provided on the connecting pipe connecting the fuel storage tank A and the 2#EDG daily fuel tank, an explosion-proof solenoid valve 3 is provided on the connecting pipe connecting the fuel storage tank B and the 2#EDG daily fuel tank, and an explosion-proof solenoid valve 4 is provided on the connecting pipe connecting the fuel storage tank B and the 3#EDG daily fuel tank. Such a connection ensures that under the condition that the two fuel storage tanks A / B supply oil to the three daily fuel tanks 1#2#3#, the fuel storage tank A can choose to supply oil to the 1#EDG daily fuel tank or the 2#EDG daily fuel tank, and the fuel storage tank B can choose to supply oil to the 3#EDG daily fuel tank or the 2#EDG daily fuel tank. By setting explosion-proof solenoid valves on different connecting pipes, highly flexible switching of the fuel delivery path is achieved. This design enables the system to flexibly adjust the fuel supply path according to the operating status and needs of different units (1#EDG, 2#EDG, 3#EDG), ensuring that sufficient fuel supply can be obtained in time when any unit needs to be started or operated. This flexibility not only improves the adaptability of the system, but also enhances the overall operating efficiency of nuclear power emergency diesel generator sets.

[0030] The solenoid valves on the fuel pipeline are controlled by the start-stop status signal of the unit, and the solenoid valves of each channel are interlocked with each other and have a manual control function. By setting a nuclear safety level 3 explosion-proof solenoid valve on the fuel pipeline and equipping it with a control device and a manual control mechanism, this embodiment ensures the safety and reliability of the fuel delivery process. The nuclear safety level 3 certification of the solenoid valve means that they can operate stably in extreme environments and reduce the possibility of failure. At the same time, the control device can automatically control the opening and closing of the solenoid valve according to the start-stop status signal of the unit to ensure the timeliness and accuracy of fuel delivery. In extreme cases, such as failure of automatic control, the operator can quickly switch the fuel delivery path through the manual control mechanism to ensure the safe operation of the system. In particular, the nuclear power emergency diesel generator set has the characteristics of reliable operation and low failure rate. By applying this method, the fuel delivery can be effectively switched to reduce the risk of diesel unit shutdown causing nuclear reactor shutdown.

[0031] Unit fuel delivery switching function: A nuclear safety level 3 explosion-proof solenoid valve is set on the pipeline between the fuel storage tank and the daily fuel tank to select the fuel supply to the 1#EDG daily fuel tank, 2#EDG daily fuel tank or 3#EDG daily fuel tank. It also has a manual control function. In the extreme case of control failure, the fuel delivery can be switched manually. A control device is set up to control the solenoid valve on the fuel pipeline so that it is controlled by the start-stop status signal of the unit. A connecting pipeline is set up to transport fuel from the fuel storage tank to the daily fuel tank.

[0032] During normal operation, control to open explosion-proof solenoid valves 1 and 4, and close explosion-proof solenoid valves 2 and 3 to ensure the operation of units 1# and 3#;

[0033] When the 1# unit fails and the 2# unit needs to be started, the explosion-proof solenoid valve 1 is closed and the explosion-proof solenoid valves 2 and 3 are opened to ensure the normal start-up and operation of the 2# unit;

[0034] When the 3# unit fails and the 2# unit needs to be started, the explosion-proof solenoid valve 4 is closed, and the explosion-proof solenoid valves 2 and 3 are opened to ensure the normal starting and operation of the 2# unit.

[0035] Tests have shown that operators only need to perform simple operations according to the unit status and needs to switch the fuel delivery path without complicated settings and adjustments. In addition, since the system uses standardized equipment and components, the cost and difficulty of maintenance and replacement are reduced, and the maintainability and economy of the system are improved.

[0036] Although the present invention has been shown and described herein with reference to specific embodiments and data, it should be understood that various modifications, changes and corrections may be made by those skilled in the art, and therefore the description and drawings herein should be interpreted for illustrative purposes rather than limiting the scope and spirit of the present invention.

Claims

1. A miniaturized nuclear power emergency diesel generator fuel delivery switching system, characterized in that: include: At least two fuel storage tanks for storing diesel; Three daily fuel tanks, namely 1#EDG daily fuel tank, 2#EDG daily fuel tank and 3#EDG daily fuel tank, are used to provide daily fuel supply to nuclear power emergency diesel generator sets; A fuel delivery pipeline connecting the fuel storage tank and the daily fuel tank; At least six explosion-proof solenoid valves are respectively arranged on the fuel delivery pipeline, and one explosion-proof solenoid valve is arranged on the delivery channel from each fuel storage tank to each fuel daily tank, for controlling the delivery direction of the fuel; A control device, connected to each channel explosion-proof solenoid valve, for receiving the start and stop status signal of the nuclear power emergency diesel generator set and controlling the switch state of the explosion-proof solenoid valve to realize automatic switching of fuel delivery; The manual control mechanism is respectively connected to the explosion-proof solenoid valve of each channel and is used for manually switching the fuel delivery path when the automatic control fails.

2. The miniaturized nuclear power emergency diesel generator fuel delivery switching system according to claim 1 is characterized in that: The control device is designed with mutual interlocking logic of the electromagnetic valves of each channel to ensure that at any time, each fuel daily tank is only supplied by one fuel storage tank, while avoiding conflicts in the fuel delivery path.

3. The miniaturized nuclear power emergency diesel generator fuel delivery switching system according to claim 1 is characterized in that: The control device can automatically select the fuel storage tank to supply fuel to the corresponding fuel daily tank according to the start-stop status signal of the unit, including: fuel storage tank A selects to supply fuel to 1#EDG daily tank or 2#EDG daily tank, and fuel storage tank B selects to supply fuel to 3#EDG daily tank or 2#EDG daily tank.

4. The miniaturized nuclear power emergency diesel generator fuel delivery switching system according to any one of claims 1 to 3, characterized in that: The manual control mechanism includes an operating handle or a switch, which can directly control the opening or closing of the solenoid valve to achieve manual switching of the fuel delivery path.

5. A method for switching fuel delivery using the miniaturized nuclear power emergency diesel generator fuel delivery switching system according to any one of claims 1 to 4, characterized in that: Includes steps: S1. Receive the start and stop status signal of the nuclear power emergency diesel generator set; S2. According to the start-stop status signal, select and control the corresponding explosion-proof solenoid valve to open or close, so as to realize the fuel supply from the fuel storage tank to the corresponding fuel daily tank.

6. The method for switching fuel delivery according to claim 5, characterized in that: Also includes: In the event of automatic control failure, the fuel delivery path is manually switched through the manual control mechanism.

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