Chemical adding device applied to auxiliary water supply system of nuclear power plant

Abstract

The utility model provides a dosing device applied to an auxiliary water supply system of a nuclear power plant. The dosing device comprises a dosing tank, a dosing pipe, a dosing pump and an output pipe, one end of the medicine inlet pipe is connected to the suction end of the medicine adding pump, and the other end of the medicine inlet pipe extends into the medicine adding tank; one end of the output pipe is connected to the discharge end of the dosing pump, and the end, away from the dosing pump, of the output pipe is used for being connected with an auxiliary water supply system. According to the utility model, the dosing tank is arranged to accommodate ammonia or hydrazine liquid medicine and is convenient to move to the auxiliary water supply system, the liquid medicine is pumped to the auxiliary water supply system through the dosing pump so as to carry out dosing test and debugging on the auxiliary water supply system in time, and the dosing test and debugging can be carried out synchronously with the installation of a formal dosing device; delayed debugging period caused by waiting for installation of the chemical reagent injection system is avoided, the overall engineering time is shortened, a faulted official dosing device can be replaced for temporary dosing treatment, and the flexibility and adaptability of the chemical reagent injection system are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to nuclear power plant chemical reagent injection system technical field, more specifically, it is a kind of dosing device for nuclear power plant auxiliary feedwater system. BACKGROUND

[0002] Auxiliary feedwater system (Auxiliary feedwater system, for short: ASG system) is an important component of nuclear power unit, for providing standby water to steam generator under specific conditions, such as start-up, shutdown or emergency situation. The common auxiliary feedwater system includes start-up and shutdown auxiliary feedwater system (Start up and shutdown auxiliary feedwater system, for short: SSR system). The start-up and shutdown auxiliary feedwater system can ensure the safe and stable operation of the unit during start-up and shutdown phase, and can also provide necessary cooling water source in emergency situation to prevent serious accidents.

[0003] Chemical reagent injection system (Chemical Reagents Injection, for short: SIR system) can provide chemicals for auxiliary feedwater system to ensure the durability and reliability of auxiliary feedwater system. For example, during the commissioning phase of nuclear power unit, in order to prevent corrosion of carbon steel pipeline and container of auxiliary feedwater system, ammonia water is added to the system pipe network through the dosing device of chemical reagent injection system to adjust the pH value of fluid medium, or hydrazine is added to reduce the oxygen content in water. In addition, ammonia and hydrazine can adjust the quality of secondary circuit water, prevent corrosion of thermal system and formation of deposits in steam generator, to ensure the safe and stable operation of nuclear power plant.

[0004] However, the chemical reagent injection system is usually arranged in a specific room, while the auxiliary feedwater system is arranged in the plant house, so that the formal dosing device needs to be fixed and laid in the park and across multiple plants and corridors. Therefore, the pipe network of the dosing device is longer, the pipe laying complexity is high and the required time is longer, which leads to the fact that the dosing device cannot be put into operation in time during the initial stage of engineering commissioning, and it is difficult to test the performance of the auxiliary feedwater system. UTILITY MODEL CONTENTS

[0005] The utility model aims at overcoming the defects of prior art, and provides a dosing device applied to nuclear power plant auxiliary feedwater system, to solve the technical problem that the conventional dosing device cannot be put into operation in time during engineering commissioning.

[0006] To achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

[0007] The utility model provides a kind of dosing device applied to nuclear power plant auxiliary water supply system, it includes: dosing tank, medicine inlet pipe, dosing pump and output pipe;One end of the medicine inlet pipe is connected to the suction end of the dosing pump, and the other end extends into the dosing tank;One end of the output pipe is connected to the discharge end of the dosing pump, and the end of the output pipe away from the dosing pump is used to connect auxiliary water supply system.

[0008] Wherein, the discharge end of the dosing pump and the output pipe are provided with an isolation valve.

[0009] Wherein, the isolation valve is a one-way valve, and the conveying direction of the one-way valve is the direction from the dosing pump to the output pipe.

[0010] Wherein, the dosing device applied to nuclear power plant auxiliary water supply system further includes: bottom valve;The bottom valve is connected to the end of the medicine inlet pipe away from the dosing pump.

[0011] Wherein, the dosing device applied to nuclear power plant auxiliary water supply system further includes: liquid level detector;The liquid level detector is arranged in the dosing tank, for detecting the liquid level of the medicine water in the dosing tank.

[0012] Wherein, the dosing device applied to nuclear power plant auxiliary water supply system further includes: control module;The liquid level detector, the dosing pump, the isolation valve and the bottom valve are electrically connected to the control module, and the control module is used to receive the liquid level signal of the liquid level detector and control the start and stop of the dosing pump, the isolation valve and the bottom valve.

[0013] Wherein, the medicine inlet pipe is a flexible pipe.

[0014] Wherein, the output pipe is a flexible pipe.

[0015] Wherein, both ends of the output pipe are provided with fastening clamps.

[0016] Wherein, the dosing tank is provided with pretreatment mechanism, and the pretreatment mechanism is used to clean the residues in the dosing tank.

[0017] The utility model has the beneficial effects compared with prior art: the utility model is through setting dosing tank to accommodate ammonia or hydrazine medicine water, it is convenient to move to auxiliary water supply system, and through dosing pump extraction medicine water to auxiliary water supply system, and timely to auxiliary water supply system is dosed test and debugging, can with the installation of formal dosing device synchronization is carried out, avoids because of waiting chemical reagent injection system's installation causes the postponement of debugging construction period, shortens the whole engineering time, also can replace the formal dosing device temporarily dosing treatment of failure, the portable movement setting of dosing tank can also shorten the length of pipeline, simplify installation difficulty, improve the flexibility and adaptability of chemical reagent injection system.

[0018] The above description is only a summary of the technical scheme of the present application. In order to more clearly understand the technical means of the present application, the content of the specification can be implemented, and in order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following preferred embodiments are described in detail as follows. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The overall structure schematic diagram of the dosing device applied to the auxiliary water supply system of the nuclear power plant is provided.

[0020] Reference signs:

[0021] 1, dosing tank; 2, dosing pipe; 3, dosing pump; 4, output pipe; 5, isolation valve; 6, transmission pipe; 7, bottom valve; 8, auxiliary water supply system. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical scheme and advantages of the present application more clear, the following will be further described in combination with the drawings and specific embodiments. The technical scheme in the embodiments of the present application will be clearly and completely described below in combination with the drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0023] It should be understood that when used in the specification and the appended claims, the terms "comprise" and "include" indicate the presence of described features, integers, steps, operations, elements, and / or components, but do not exclude one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0024] It should also be understood that the terms used in the present application specification are only for the purpose of describing specific embodiments and are not intended to limit the present application. As used in the present application specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include the plural forms.

[0025] It should be further understood that the term "and / or" used in the present application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes these combinations.

[0026] Reference Figure 1As shown, the embodiment discloses a dosing device applied to the auxiliary feedwater system of a nuclear power plant, which comprises a dosing tank 1, a dosing pipe 2, a dosing pump 3 and an output pipe 4. One end of the dosing pipe 2 is connected to the suction end of the dosing pump 3, and the other end extends into the dosing tank 1. One end of the output pipe 4 is connected to the discharge end of the dosing pump 3, and the end of the output pipe 4 away from the dosing pump 3 is used to connect the auxiliary feedwater system 8.

[0027] In specific implementation, the dosing pipe 2 is inserted into the dosing tank 1, and the dosing pipe 2 is connected to the dosing pump 3. Then, the output pipe 4 is connected to the dosing pump 3, and the end of the output pipe 4 away from the dosing pump 3 is connected to the dosing pipe 2 line of the auxiliary feedwater system 8, including but not limited to the suction end of the dosing pump of the auxiliary feedwater system 8 and the inlet end of the heat exchanger. When the dosing operation needs to be performed, the dosing amount of the chemical solution is calculated, the preset amount of the chemical solution is added to the dosing tank 1, the dosing pump 3 is started to add the chemical solution to the auxiliary feedwater system 8, and after the dosing is completed, the dosing pump 3 is stopped to complete the dosing operation.

[0028] The dosing device applied to the auxiliary feedwater system of the nuclear power plant of the embodiment can accommodate ammonia or hydrazine chemical solution through the dosing tank 1, is convenient to move to the auxiliary feedwater system 8, and can extract the chemical solution to the auxiliary feedwater system 8 through the dosing pump 3 to timely perform the dosing test and debugging of the auxiliary feedwater system 8, can be performed synchronously with the installation of the formal dosing device, avoids the delay of the debugging period due to the installation of the chemical reagent injection system, shortens the overall engineering time, can temporarily perform the dosing treatment by replacing the formal dosing device in case of failure, the portable and movable setting of the dosing tank 1 can shorten the length of the pipeline, simplify the installation difficulty, and improve the flexibility and adaptability of the chemical reagent injection system. The dosing pipe 2, the dosing pump 3 and the output pipe 4 are matched with each other to ensure the smooth transmission of the chemical solution from the dosing tank 1 to the auxiliary feedwater system 8, the structure is simple, and the operation and maintenance are easy, which is helpful to reduce the manufacturing and maintenance costs. The traditional ammonia and hydrazine dosing device includes a set of ammonia and hydrazine adding mechanism, each set of ammonia and hydrazine adding mechanism includes two ammonia storage tanks, two ammonia unloading pumps, four ammonia absorbers, a solution tank, two manual metering pumps for adding ammonia and hydrazine to the auxiliary feedwater system 8, an electric stirrer and the like, so that the traditional dosing device has a large structure and is difficult to move. The dosing device applied to the auxiliary feedwater system of the nuclear power plant of the embodiment can move the dosing tank 1 to the corresponding auxiliary feedwater system 8, add the configured ammonia or hydrazine chemical solution to the dosing tank 1, replace the traditional dosing device with the advantages of high flexibility and low installation difficulty, perform the chemical solution delivery to the auxiliary feedwater system 8, and can also avoid the excessive chemical solution, save the chemical reagent resources, and be helpful to build the environmentally friendly and energy-saving nuclear power unit.

[0029] Specifically, the discharge end of the dosing pump 3 and the output pipe 4 are provided with an isolation valve 5. When the dosing device needs to be started, after a preset amount of medicine is added into the dosing tank 1, the isolation valve 5 is opened and the dosing pump 3 is started; when the dosing is completed, the dosing pump 3 is stopped and the isolation valve 5 is closed. The isolation valve 5 is used to cut off the fluid medium, so that the pipeline is in a closed state, which helps to cut off the medicine in an emergency, such as pipeline rupture or leakage, to avoid waste of medicine; and when the dosing pump 3 stops working, the medicine in the output pipe 4 may backflow due to inertia or pressure in the system, which may cause damage to the dosing pump 3, and the isolation valve 5 can effectively prevent pressure backflow and protect the safety of the dosing device; the isolation valve 5 can completely isolate the dosing device from the auxiliary water supply system 8, which is convenient for maintenance and replacement of parts in the dosing device or the auxiliary water supply system 8, and at the same time, provides a more flexible medicine delivery method, which can temporarily stop dosing to the auxiliary water supply system 8 without stopping the dosing pump 3, so as to facilitate preparation work for the next dosing operation.

[0030] Specifically, the isolation valve 5 is a one-way valve, and the conveying direction of the one-way valve is the direction from the dosing pump 3 to the output pipe 4. The isolation valve 5 only allows one-way flow, i.e., only allows the medicine to flow from the dosing pump 3 to the output pipe 4, which can prevent backflow of the medicine during transmission and avoid damage to the dosing pump 3 caused by backflow of the medicine, and at the same time, ensures that the auxiliary water supply system 8 can receive a preset amount of medicine, and ensures the dosing effect of the dosing device.

[0031] Specifically, the isolation valve 5 is connected to the discharge end of the dosing pump 3 through a transmission pipe 6. The transmission pipe 6 simplifies the connection difficulty of the isolation valve 5 and the dosing pump 3, and increases the distance between the dosing pump 3 and the isolation valve 5, thereby providing a stable and sufficient working space for the isolation valve 5 and the dosing pump 3, reducing the interference of vibration or fluctuation of the medicine between the dosing pump 3 and the isolation valve 5 caused by start-stop changes, prolonging the service life of the dosing pump 3 and the isolation valve 5, and ensuring the durability and reliability of the dosing device.

[0032] Specifically, the dosing device applied to the auxiliary water supply system of the nuclear power plant further comprises a bottom valve 7 connected to one end of the medicine inlet pipe 2 away from the dosing pump 3. In the dosing process, if the medicine inlet pipe 2, the transmission pipe 6 or the output pipe 4 is blocked, leaked, and the dosing pump 3 or the isolation valve 5 fails, the bottom valve 7 can quickly cut off the flow of medicine to prevent the failure from expanding, thereby effectively reducing the loss; in addition, the bottom valve 7 is helpful for changing the type of medicine or adjusting the concentration of the medicine, and only needs to be closed to cut off the current supply of medicine, so that the medicine in the dosing tank 1 can be cleaned, discharged or adjusted, which is simple and safe, and improves the ease of use and practicality of the dosing device.

[0033] Specifically, the dosing device applied to the auxiliary feedwater system of the nuclear power plant further comprises a liquid level detector (not shown) arranged in the dosing tank 1 and configured to detect the liquid level of the chemical solution in the dosing tank 1. The liquid level detector can realize real-time monitoring of the liquid level of the chemical solution, avoid potential risks caused by insufficient or excessive chemical solution, and provide an accurate reference for chemical solution calculation or adjustment.

[0034] Specifically, the dosing device applied to the auxiliary feedwater system of the nuclear power plant further comprises a control module (not shown). The liquid level detector, the dosing pump 3, the isolation valve 5, and the bottom valve 7 are electrically connected to the control module. The control module is configured to receive the liquid level signal of the liquid level detector and control the start and stop of the dosing pump 3, the isolation valve 5, and the bottom valve 7. The control module can accurately determine the dosing progress by receiving the signal of the liquid level detector and control the start and stop of the dosing pump 3, the isolation valve 5, and the bottom valve 7, thereby realizing precise control and automatic control of the dosing process. The dosing pump 3, the isolation valve 5, and the bottom valve 7 can be turned off in time when the liquid level reaches the preset end value, and the dosing pump 3, the isolation valve 5, and the bottom valve 7 can be turned on automatically when the liquid level reaches the preset start value. The intelligent degree of the dosing device is greatly improved, which helps to improve the dosing efficiency, and the staff does not need to work on site, thereby effectively saving human resources and labor burden, reducing the damage of chemical reagents to the health of the staff, and improving the safety of the dosing device and the staff.

[0035] Specifically, the dosing pipe 2 is a flexible pipe. The flexible pipe design makes the dosing pipe 2 flexible and stretchy, which adapts to different working environments and scenarios, and the flexible pipe also has certain elasticity and wear resistance, which can prolong the service life of the dosing pipe 2 and the dosing device.

[0036] In this embodiment, the dosing pipe 2 is a plastic hose. The plastic hose is light in weight and can be moved conveniently. The plastic hose can be compressed into a smaller shape, saving space and facilitating storage and transportation, greatly improving the mobility of the dosing device and expanding the application scenarios of the dosing device. The production cost of the plastic hose is relatively low, which meets the environmental protection requirements of recycling, and helps to reduce the cost of the dosing pipe 2 and the entire dosing device. It can be understood that in other embodiments, a rubber hose, a silica gel hose, a metal bellows or other flexible pipes can be used instead of the plastic hose according to actual needs.

[0037] Specifically, the output pipe 4 is a flexible pipe. The flexible pipe design makes the output pipe 4 flexible and stretchy, which adapts to different working environments and scenarios, and the flexible pipe also has certain elasticity and wear resistance, which can prolong the service life of the output pipe 4 and the dosing device.

[0038] In the embodiment, the output pipe 4 is a plastic hose. The plastic hose has a small weight and can be conveniently moved. The plastic hose can be compressed into a small shape, saving space, facilitating storage and transportation, greatly improving the moving flexibility of the dosing device, and expanding the application scenarios of the dosing device. Moreover, the production cost of the plastic hose is relatively low, which meets the environmental protection requirements of recycling and helps to reduce the cost of the output pipe 4 and the entire dosing device. The inlet pipe 2 and the output pipe 4 are both plastic hoses, so that the total weight of the dosing device is not more than 10 Kg, which further improves the moving flexibility of the dosing device. It can be understood that in other embodiments, a rubber hose, a silica gel hose, a metal bellows or other flexible pipes can be used instead of the plastic hose according to actual needs.

[0039] Specifically, both ends of the output pipe 4 are provided with fastening clamps (not shown). The fastening clamps can provide strong clamping force to fasten and connect the output pipe 4 with the isolation valve 5 and the auxiliary water supply system 8, ensuring that the connection between the output pipe 4 and the isolation valve 5 and the auxiliary water supply system 8 is tight and leak-free, which helps to prevent the leakage of the medicine outside the connection of the output pipe 4, protects the safety of the workers, and also avoids damage to the environment and surrounding equipment. Moreover, the fastening clamps can adapt to various sizes and shapes of interfaces, and can adjust the clamping degree according to actual needs to ensure the firmness and sealing of the connection. In addition, the fastening clamps are easy to disassemble and assemble, and can be installed on the output pipe 4 without complex tools or skills, which greatly improves the installation efficiency of the dosing device. When the output pipe 4 needs to be repaired or replaced, the fastening clamps can also be easily disassembled, which reduces the maintenance cost and time.

[0040] Specifically, the dosing tank 1 is provided with a pretreatment mechanism (not shown) for cleaning the residues in the dosing tank 1. The pretreatment mechanism is used to detect whether there are residues in the dosing tank 1 before use of the dosing device. If there are residues, the dosing tank 1 is cleaned with desalted water until it meets the water quality requirements, and then the bottom valve 7 and the inlet pipe 2 are placed in the dosing tank 1. The pretreatment mechanism can ensure the cleanliness of the dosing tank 1, which can avoid the mixing or pollution between different batches of medicine, so as to ensure that each dosing is based on the accurate preset amount of medicine, thereby improving the accuracy of the amount of medicine and the dosing effect. Moreover, the pretreatment mechanism can remove residues to avoid corrosion or wear of the dosing tank 1, thereby prolonging the service life of the dosing tank 1.

[0041] In an optional embodiment, the pretreatment mechanism includes a feeding pipe and a discharge member. The feeding pipe is used to convey desalted water into the dosing tank 1, and the discharge member is used to drive the liquid in the dosing tank 1 to leave the dosing tank 1. Further, the discharge member can adopt a pump body structure or a discharge pipe arranged at the bottom of the dosing tank 1. The feeding pipe and the discharge member facilitate the addition and discharge of desalted water, and have a simple structure and convenient operation, thereby improving the ease of use of the dosing device.

[0042] The embodiment provides a dosing device applied to an auxiliary feed water system of a nuclear power plant, a dosing tank is arranged to contain ammonia or hydrazine water, the dosing tank is convenient to move to the auxiliary feed water system, and the dosing pump is used to extract the water to the auxiliary feed water system, so that the auxiliary feed water system can be timely dosed, tested and debugged, the installation of the formal dosing device can be synchronously performed, the debugging period is avoided from being delayed due to waiting for installation of a chemical reagent injection system, the overall engineering time is shortened, the formal dosing device can be temporarily replaced by the dosing device to perform dosing treatment, the portable and movable arrangement of the dosing tank can shorten the length of a pipeline, simplify installation difficulty, and improve flexibility and adaptability of the chemical reagent injection system.

[0043] The above is only used for further illustrating the technical content of the utility model by means of examples, so that the reader can more easily understand, but does not represent that the embodiment of the utility model is limited to this, any technical extension or re-creation made according to the utility model is protected by the utility model. The protection scope of the utility model is subject to the claims.

Claims

1. A chemical feeding device applied to an auxiliary feedwater system of a nuclear power plant, characterized in that, The application relates to a medicine adding device for water supply system. The device comprises a medicine tank, a medicine inlet pipe, a medicine adding pump and an output pipe. One end of the medicine inlet pipe is connected to the suction end of the medicine adding pump, and the other end of the medicine inlet pipe extends into the medicine tank. One end of the output pipe is connected to the discharge end of the medicine adding pump, and the other end of the output pipe is used for connecting an auxiliary water supply system.

2. The chemical feeding device for use in an auxiliary feedwater system of a nuclear power plant according to claim 1, characterized in that, A separation valve is arranged between the discharge end of the medicine adding pump and the output pipe.

3. The chemical feeding device for use in an auxiliary feedwater system of a nuclear power plant according to claim 2, characterized in that The separation valve is a one-way valve, and the conveying direction of the one-way valve is the direction from the medicine adding pump to the output pipe.

4. The chemical feeding device for use in an auxiliary feedwater system of a nuclear power plant according to claim 2, characterized by The device further comprises a bottom valve, which is connected to the end of the medicine inlet pipe far away from the medicine adding pump. The device further comprises a liquid level detector, which is arranged in the medicine tank and used for detecting the liquid level of the medicine water in the medicine tank.

5. The chemical feeding device for use in an auxiliary feedwater system of a nuclear power plant according to claim 4, characterized in that The device further comprises a control module, which is electrically connected to the liquid level detector, the medicine adding pump, the separation valve and the bottom valve. The control module is used for receiving the liquid level signal of the liquid level detector and controlling the start and stop of the medicine adding pump, the separation valve and the bottom valve.

6. The chemical feeding device for use in an auxiliary feedwater system of a nuclear power plant according to claim 5, characterized in that The medicine inlet pipe is a flexible pipe. The output pipe is a flexible pipe.

7. The chemical feeder for use in an auxiliary feedwater system of a nuclear power plant according to claim 1, characterized by Both ends of the output pipe are provided with fastening clamps.

8. The chemical feeder for use in an auxiliary feedwater system of a nuclear power plant according to claim 1, characterized by The medicine tank is provided with a pretreatment mechanism, which is used for cleaning the residues in the medicine tank.

9. The chemical feeding device for use in an auxiliary feedwater system of a nuclear power plant according to claim 8, characterized in that ​ 10. The chemical feeder for use in an auxiliary feedwater system of a nuclear power plant according to claim 1, characterized by ​

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