CN219283668U - Chilled water system of nuclear power plant - Google Patents
Chilled water system of nuclear power plant Download PDFInfo
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- CN219283668U CN219283668U CN202320222130.4U CN202320222130U CN219283668U CN 219283668 U CN219283668 U CN 219283668U CN 202320222130 U CN202320222130 U CN 202320222130U CN 219283668 U CN219283668 U CN 219283668U
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 209
- 230000001105 regulatory effect Effects 0.000 claims abstract description 24
- 238000012360 testing method Methods 0.000 claims description 7
- 238000012544 monitoring process Methods 0.000 claims description 6
- 238000004891 communication Methods 0.000 claims description 4
- 238000002955 isolation Methods 0.000 claims description 4
- 239000003570 air Substances 0.000 abstract description 35
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 239000012080 ambient air Substances 0.000 abstract description 2
- 239000000498 cooling water Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 3
- 230000001502 supplementing effect Effects 0.000 description 3
- 238000004378 air conditioning Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008602 contraction Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
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Abstract
The utility model relates to the technical field of water supply systems of nuclear power plants, in particular to a chilled water system of a nuclear power plant, which comprises the following components: the system comprises a cold water making pipeline, a chilled water user, an expansion water tank and a chilled water pump which are circularly connected; the cold water making pipeline comprises a variable-frequency steam compressor unit and an air heat exchanger which are arranged in parallel, and two ends of a chilled water user are provided with first regulating valves in parallel. The variable-frequency steam compressor unit is connected with the air heat exchanger in parallel, when the ambient temperature is not less than the set temperature, the variable-frequency steam compressor unit works, and when the ambient temperature is less than the set temperature, the variable-frequency steam compressor unit works together with the air heat exchanger. The air heat exchanger is used for generating chilled water meeting the requirements by absorbing and converting the cold energy in ambient air into the cold energy of chilled water in the heat exchanger, and meanwhile, the variable-frequency steam compressor unit is matched, so that the chilled water supply output by the cold water making pipeline is controlled to be stable, and the energy consumption of a chilled water system of a nuclear power plant in a cold environment can be greatly reduced.
Description
Technical Field
The utility model relates to the technical field of water supply systems of nuclear power plants, in particular to a chilled water system of a nuclear power plant.
Background
The chilled water system of the nuclear power plant plays a role in providing chilled water to a ventilation system and a process system in the nuclear power plant. The chilled water systems of the nuclear power plant can be divided into unsafe chilled water systems and safe chilled water systems, and the unsafe chilled water systems serve unsafe users, such as unsafe air conditioning systems, unsafe process equipment and the like; safety chilled water systems serve some safety-level air conditioning systems and process equipment. Many in-operation nuclear power plants and planned nuclear power plants in China exist in both southern coastal sites and northern coastal sites, and the frozen water system is required to be reliably operated all year round for the nuclear power plants at various sites. In the prior art, a steam compression type water chilling unit is selected for a nuclear power plant to provide chilled water for the nuclear power plant. The vapor compression type water chilling unit mainly comprises four main parts, namely a compressor, a condenser, an expansion valve and an evaporator. The refrigerant changes physical state in the closed system, the provided cold energy is continuous and stable, and the requirements of the nuclear power plant on safe and stable operation of the chilled water system can be well met. When the vapor compression type water chilling unit is operated, a power supply is required to drive equipment such as a compressor in the system to work, and more energy is required to be consumed in refrigeration work.
Disclosure of Invention
Therefore, the technical problem to be solved by the utility model is to overcome the defect of higher energy consumption in the operation of the chilled water system of the nuclear power plant in the prior art, thereby providing the chilled water system of the nuclear power plant.
In order to solve the above technical problems, the present utility model provides a chilled water system of a nuclear power plant, comprising:
the system comprises a cold water making pipeline, a chilled water user, an expansion water tank and a chilled water pump which are circularly connected;
the cold water making pipeline comprises a variable-frequency steam compressor unit and an air heat exchanger which are arranged in parallel, and two ends of a chilled water user are provided with first regulating valves in parallel;
when the ambient temperature is not less than the set temperature, the variable-frequency steam compressor unit works to provide chilled water for chilled water users; when the ambient temperature is less than the set temperature, the variable-frequency steam compressor unit works together with the air heat exchanger to provide chilled water for chilled water users.
Optionally, a constant pressure branch is arranged on a pipeline between the chilled water user and the chilled water pump, and the expansion water tank is arranged on the constant pressure branch.
Optionally, a water filling pipeline is also communicated with the constant pressure branch, and the water filling pipeline is connected with the expansion water tank in parallel.
Optionally, the water outlet end of the cold water making pipeline is provided with a first three-way valve, one valve port of the first three-way valve is communicated with the variable-frequency steam compressor unit, the other valve port is communicated with the air heat exchanger, and the other valve port is communicated with a chilled water user.
Optionally, a monitoring assembly is installed between the air heat exchanger and the first three-way valve.
Optionally, a second three-way valve is arranged at the water inlet end of the cold water making pipeline, one valve port of the second three-way valve is communicated with the variable-frequency steam compressor unit, the other valve port is communicated with the air heat exchanger, and the other valve port is communicated with the expansion water tank.
Optionally, isolation valves are installed between the second three-way valve and the variable frequency steam compressor unit and between the second three-way valve and the air heat exchanger.
Optionally, a second regulating valve is installed at the water outlet end of the chilled water user, and the chilled water user is in signal connection with the second regulating valve.
Optionally, the pipelines at two ends of the air heat exchanger are respectively provided with a test water supply branch and a test water drainage branch.
Optionally, a check valve is installed at the water inlet end of the variable frequency vapor compressor unit.
The technical scheme of the utility model has the following advantages:
1. the utility model provides a chilled water system of a nuclear power plant, comprising: the system comprises a cold water making pipeline, a chilled water user, an expansion water tank and a chilled water pump which are circularly connected; the cold water making pipeline comprises a variable-frequency steam compressor unit and an air heat exchanger which are arranged in parallel, and two ends of a chilled water user are provided with first regulating valves in parallel; when the ambient temperature is not less than the set temperature, the variable-frequency steam compressor unit works to provide chilled water for chilled water users; when the ambient temperature is less than the set temperature, the variable-frequency steam compressor unit works together with the air heat exchanger to provide chilled water for chilled water users.
According to the requirements of the nuclear power plant, the chilled water system of the nuclear power plant needs to be operated all the year round. The variable-frequency steam compressor unit is connected with the air heat exchanger in parallel, and works to provide chilled water for chilled water users when the ambient temperature is not less than the set temperature; when the ambient temperature is less than the set temperature, the variable-frequency steam compressor unit works together with the air heat exchanger to provide chilled water for chilled water users. The air heat exchanger is used for generating chilled water meeting the requirements by absorbing and converting the cold energy in ambient air into the cold energy of chilled water in the heat exchanger, and meanwhile, the air heat exchanger is matched with a variable-frequency steam compressor unit to control the temperature, the flow rate and other data of the chilled water output by a cold water making pipeline to be stable. The operation power of the variable-frequency steam compressor unit in a cold environment can be greatly reduced, and the energy consumption of a chilled water system of a nuclear power plant is reduced. For the nuclear power plant in the northern plant site, the environmental temperature in winter is far lower than the indoor temperature, and if the cold energy in the environment is fully utilized in winter, a large amount of energy sources are saved.
2. The utility model provides a chilled water system of a nuclear power plant, wherein a constant-pressure branch is arranged on a return pipeline in front of a chilled water pump, and an expansion water tank is arranged on the constant-pressure branch. The expansion water tank is used for setting the pressure of the chilled water system and providing a certain amount of expansion and contraction water so that the water pressure circulating in the chilled water system is within a preset range.
3. The chilled water system of the nuclear power plant provided by the utility model is characterized in that the water charging pipeline is used for introducing an initial water source into the circulating pipeline and the expansion tank in the initial stage of system operation, and the chilled water is sourced from a desalted water system arranged in the nuclear power plant.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural view of a chilled water system of a nuclear power plant according to an embodiment of the present utility model.
Reference numerals illustrate: 1. an expansion tank; 2. a first three-way valve; 3. a second three-way valve; 4. an isolation valve; 5. an air heat exchanger; 6. a first regulating valve; 7. a second regulating valve; 8. a third regulating valve; 9. a variable frequency vapor compressor unit; 10. a check valve; 11. a chilled water pump; 12. chilled water users; 13. an electric switch valve.
Detailed Description
The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
In addition, the technical features of the different embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.
Examples
As shown in fig. 1, the chilled water system of a nuclear power plant according to the present embodiment is installed in a cold winter area. The solid line in fig. 1 is a water line, and the broken line is signal transmission. The chilled water system of the nuclear power plant in the embodiment is installed in the nuclear power plant in the north of China. The chilled water system of the nuclear power plant comprises a cold water making pipeline, a chilled water user 12, an expansion tank 1 and a chilled water pump 11 which are connected in a circulating manner.
The cold water making pipeline comprises a variable-frequency steam compressor unit 9 and an air heat exchanger 5 which are arranged in parallel, and two ends of a chilled water user 12 are provided with two-way regulating valves with differential pressure transmitters in parallel, wherein the two-way regulating valves are used as first regulating valves 6. When the ambient temperature is not less than the set temperature, the variable frequency vapor compressor unit 9 works to provide chilled water for chilled water users 12; when the ambient temperature is less than the set temperature, the variable frequency vapor compressor unit 9 works together with the air heat exchanger 5 to provide chilled water to the chilled water user 12. The variable frequency vapor compressor unit 9 is a screw type or centrifugal compressor unit, and can be air-cooled (cooling water pipeline is not needed) or water-cooled.
A constant pressure branch is arranged on a pipeline between the chilled water user 12 and the chilled water pump 11, and the expansion water tank 1 is arranged on the constant pressure branch. And the constant pressure branch is also communicated with a water charging pipeline which is connected with the expansion water tank 1 in parallel. An electric switch valve 13 is arranged on the water charging pipeline, and the inlet end of the water charging pipeline is connected with a demineralized water system. The chilled water system of the nuclear power plant is put into operation for the first time to fill water into the system through the operation water filling pipeline, and a valve is opened to supplement water according to a pressure signal in long-term operation.
The water outlet end of the cold water making pipeline is provided with a first three-way valve 2, one valve port of the first three-way valve 2 is communicated with the variable frequency steam compressor unit 9, the other valve port is communicated with the air heat exchanger 5, and the other valve port is communicated with a chilled water user 12. A temperature sensor and a pressure sensor as monitoring components are installed between the air heat exchanger 5 and the first three-way valve 2. The variable-frequency steam compressor unit 9 is provided with a PLC controller, and the temperature sensor, the pressure sensor and the first three-way valve 2 are connected with the PLC controller in a signal manner and are used for controlling the opening degrees of three valve ports of the first three-way valve 2 according to the temperature and pressure signals of the temperature sensor and the pressure sensor, so that chilled water meeting the user demands is output to a chilled water user 12. The chilled water system of the nuclear power plant can be further provided with a temperature measuring element, a flowmeter, an isolating valve 4 and a load cell at other positions of the pipeline according to actual conditions.
The water inlet end of the cold water making pipeline is provided with a second three-way valve 3, one valve port of the second three-way valve 3 is communicated with the variable frequency steam compressor unit 9, the other valve port is communicated with the air heat exchanger 5, and the other valve port is communicated with the expansion tank 1. Isolation valves 4 are arranged between the second three-way valve 3 and the variable-frequency steam compressor unit 9 and between the second three-way valve 3 and the air heat exchanger 5.
The second regulating valve 7 is arranged at the water outlet end of the chilled water user 12, and the chilled water user 12 is in signal connection with the second regulating valve 7. A temperature sensor and a pressure sensor as monitoring components are also installed between the water outlet end of the chilled water user 12 and the second regulating valve 7, and are used for monitoring the temperature and the water pressure of the chilled water output by the chilled water user 12.
In order to directly test the air heat exchanger 5 without disassembling the air heat exchanger 5, test water supply branches and test water discharge branches are respectively installed on pipelines at two ends of the air heat exchanger 5 and used for periodically monitoring the heat exchange performance of the air heat exchanger 5 so as to ensure the operation performance of the air heat exchanger 5. In order to protect the water pump and avoid damage to the chilled water pump caused by water hammer, a check valve 10 is installed between the chilled water pump 11 and the water inlet end of the variable frequency vapor compressor unit 9.
The nuclear power plant requires the chilled water system to run all the year round, the nuclear power plant at the northern plant site runs in summer, the variable-frequency steam compressor unit 9 runs, and the loads of all chilled water users 12 are provided by the variable-frequency steam compressor unit 9; under the working condition in winter, the variable-frequency steam compressor unit 9 and the air heat exchanger 5 are combined to operate, and the load of all chilled water users 12 is jointly borne by the variable-frequency steam compressor unit 9 and the air heat exchanger 5, so that the purposes of improving the energy utilization rate and the energy efficiency of the system are achieved. Specifically, in summer working conditions (the outdoor ambient temperature is higher than the chilled water supply temperature), when the chilled water system is put into operation, enough desalted water is filled into the system by opening the electric switch valve 13, so that the system is in a full water state and the pressure meets the design requirement. It should be noted that, the chilled water system is a closed system, and only when the chilled water system is initially put into operation, the electric switch valve 13 needs to be opened to fill water, and in the running process of the chilled water system, automatic water replenishment is performed by detecting the pressure of the chilled water system. The water supplementing operation of the chilled water system can be set to be automatic water supplementing or manual water supplementing. The first three-way valve 2 and the second three-way valve 3 are adjusted to keep providing chilled water only by using the variable frequency vapor compressor unit 9, and at the moment, the chilled water pump 11 is started to establish circulation. Starting a variable-frequency steam compressor unit 9 to start preparing chilled water, and regulating the opening degree of the second regulating valve 7 according to the temperature of a chilled water user 12 to achieve the aim of controlling the flow of chilled water flowing through the chilled water user 12; the first regulating valve 6 regulates the opening degree according to the pressure difference of the main supply and return water pipe so as to meet the operation requirement of the system. The variable-frequency steam compressor unit 9 is also provided with an equipment cooling water supply pipeline and an equipment cooling water return pipeline, the equipment cooling water return pipeline is provided with a pneumatic regulating valve serving as a third regulating valve 8, the third regulating valve 8 is connected with a PLC controller in a signal manner, and the closed-loop pneumatic regulating valve regulates the opening degree according to the condensing pressure of the variable-frequency steam compressor unit 9 so as to achieve the purpose of controlling the flow rate of the equipment cooling water. The source of the equipment cooling water can be a cooling tower or an equipment cooling water system arranged in a nuclear power plant. Chilled water users 12 may be one or more. Variable frequency steam compressor package 9 is variable frequency tuned to the end user's total cold load to accommodate the end user's needs. In winter, the outdoor environment temperature is lower than the chilled water supply temperature, the first three-way valve 2 and the second three-way valve 3 are slowly adjusted, the air heat exchanger 5 is started, at the moment, the air heat exchanger 5 and the variable-frequency steam compressor unit 9 work cooperatively, the variable-frequency steam compressor unit 9 adjusts and controls the opening of the three valve ports of the first three-way valve 2 through the PLC controller, the proportion of the end loads borne by the air heat exchanger 5 and the variable-frequency steam compressor unit 9 is adjusted, and the water supply and return proportion of the air heat exchanger 5 and the variable-frequency steam compressor unit 9 is changed. The variable-frequency steam compressor unit 9 carries out variable-frequency adjustment according to the proportion of the supplied water, so that the running power of the variable-frequency steam compressor unit 9 in a cold environment can be greatly reduced, and the energy consumption of a chilled water system of a nuclear power plant is reduced.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the utility model.
Claims (10)
1. A chilled water system of a nuclear power plant, comprising:
the system comprises a cold water making pipeline, a chilled water user (12), an expansion water tank (1) and a chilled water pump (11) which are connected in a circulating way;
the cold water making pipeline comprises a variable-frequency steam compressor unit (9) and an air heat exchanger (5) which are arranged in parallel, and a first regulating valve (6) is arranged at two ends of a chilled water user (12) in parallel;
when the ambient temperature is not less than the set temperature, the variable-frequency steam compressor unit (9) works to provide chilled water for the chilled water user (12); when the ambient temperature is less than the set temperature, the variable frequency steam compressor unit (9) works together with the air heat exchanger (5) to provide chilled water for the chilled water user (12).
2. The chilled water system of a nuclear power plant according to claim 1, characterized in that a constant pressure branch is arranged on a pipeline between the chilled water user (12) and the chilled water pump (11), and the expansion tank (1) is mounted on the constant pressure branch.
3. The chilled water system of a nuclear power plant according to claim 2, wherein a water filling pipeline is further communicated with the constant pressure branch, and the water filling pipeline is arranged in parallel with the expansion tank (1).
4. A chilled water system of a nuclear power plant according to any one of claims 1 to 3, characterized in that the water outlet end of the chilled water making pipeline is provided with a first three-way valve (2), one valve port of the first three-way valve (2) is in communication with the variable frequency steam compressor unit (9), the other valve port is in communication with the air heat exchanger (5), and the other valve port is in communication with the chilled water user (12).
5. The chilled water system of a nuclear power plant according to claim 4, wherein a monitoring assembly is installed between the air heat exchanger (5) and the first three-way valve (2).
6. A chilled water system of a nuclear power plant according to any one of claims 1 to 3, characterized in that the water inlet end of the chilled water making pipeline is provided with a second three-way valve (3), one valve port of the second three-way valve (3) is communicated with the variable frequency steam compressor unit (9), the other valve port is communicated with the air heat exchanger (5), and the other valve port is communicated with the expansion tank (1).
7. The chilled water system of a nuclear power plant according to claim 6, wherein isolation valves (4) are installed between the second three-way valve (3) and the variable frequency steam compressor unit (9) and between the second three-way valve (3) and the air heat exchanger (5).
8. A chilled water system of a nuclear power plant according to any one of claims 1 to 3, characterized in that a second regulating valve (7) is mounted at the outlet end of the chilled water user (12), the chilled water user (12) being in signal connection with the second regulating valve (7).
9. A chilled water system of a nuclear power plant according to any one of claims 1 to 3, wherein the pipes at both ends of the air heat exchanger (5) are provided with a test water supply branch and a test water drain branch, respectively.
10. A chilled water system of a nuclear power plant according to any of claims 1 to 3, characterized in that the water inlet end of the variable frequency steam compressor unit (9) is fitted with a check valve (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320222130.4U CN219283668U (en) | 2023-02-02 | 2023-02-02 | Chilled water system of nuclear power plant |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320222130.4U CN219283668U (en) | 2023-02-02 | 2023-02-02 | Chilled water system of nuclear power plant |
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| Publication Number | Publication Date |
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| CN219283668U true CN219283668U (en) | 2023-06-30 |
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| CN202320222130.4U Active CN219283668U (en) | 2023-02-02 | 2023-02-02 | Chilled water system of nuclear power plant |
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- 2023-02-02 CN CN202320222130.4U patent/CN219283668U/en active Active
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