Nuclear power plant wastewater collection system and method
By collecting and treating radioactive oil-free wastewater and oil-containing wastewater separately in the nuclear power plant wastewater collection system, the complexity and space occupation problems of the existing system are solved, and investment and cost savings are achieved.
Patent Information
- Application Number
- CN202410350783.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-26
- Publication Date
- 2025-09-26
AI Technical Summary
The design of the wastewater collection system of existing nuclear power plants is complex, requiring the addition of oil-water separator equipment and additional collection pits, which increases equipment and space requirements, leading to higher investment and project costs.
Optimize the design of the wastewater collection system, collect radioactive oil-free wastewater into a single sump and oily wastewater into another sump, and treat them separately to reduce equipment configuration and space occupancy.
By collecting and treating wastewater in a classified manner, the system design is optimized, saving project investment and construction costs.
Smart Images
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Abstract
Description
Technical Field
[0001] The present application relates to the field of nuclear power plants, and in particular to a nuclear power plant wastewater collection system and method. Background Art
[0002] This section is intended to provide a background or context to the embodiments of the present application as recited in the claims. No admission is made that the description herein is prior art as disclosed by virtue of its inclusion in this section.
[0003] In existing nuclear power units, the conventional island waste liquid collection system (WLC system) collects radioactive oily and non-oily wastewater from various systems. The system is equipped with two WLC oily wastewater pits. The WLC1 pit collects oily and radioactive wastewater from the water pump trench sump. After the waste oil is separated from the oily wastewater through an oil-water separator, it is discharged into the WLC2 pit. The WLC2 pit collects water from the condensate pump pit and the drain expansion tank sump, as well as water from equipment and pipelines on each floor. The radioactive non-oily wastewater in the WLC2 pit is finally discharged into the wastewater treatment system (WQB system) for unified radioactive material attenuation treatment before centralized discharge.
[0004] In this design, the feedwater pump trench contained medium-pressure water supply pipes and filters, among other equipment and piping. The discharge of water from these pipes and filters posed a potential risk of radioactivity. During equipment maintenance, waste oil from the feedwater pump group could leak into the feedwater trench, mixing with radioactive wastewater to form radioactive oily wastewater. Because the WQB system can only treat radioactive wastewater and does not allow the discharge of oily wastewater, nuclear island wastewater treatment requirements dictate that the radioactive oily wastewater must be treated before discharge into the WQB system. This separation of waste oil and wastewater was achieved through the installation of an oil-water separator. Consequently, the original design system was complex, requiring the addition of an oil-water separator, a sump for collecting the radioactive oily wastewater, and sewage pumps for other trenches. This not only increased the investment costs for equipment and piping, but also occupied a significant portion of the turbine room, leading to a corresponding increase in plant structure costs. Summary of the Invention
[0005] The purpose of this application is to provide a nuclear power plant wastewater collection system and method, which can optimize the design of the nuclear power plant wastewater collection system, reduce the system equipment configuration and layout space, and thus save project investment and engineering costs.
[0006] The present application discloses a nuclear power plant wastewater collection system, comprising: a conventional island waste liquid collection system and a waste oil and non-radioactive water discharge system;
[0007] The conventional island waste liquid collection system includes a single first sump, which is configured to accommodate radioactive oil-free wastewater. The rear end of the sump is connected to the conventional island liquid effluent discharge system through a pipeline. The conventional island liquid effluent discharge system is configured to perform radioactive material attenuation treatment on the radioactive oil-free wastewater.
[0008] The waste oil and non-radioactive water discharge system includes a single second sump, the front end of which is connected to multiple water feed pump groups, a sealing oil system, and a lubricating oil storage room through a pipeline. The second sump is configured to accommodate non-radioactive oily wastewater, and the rear end of the second sump is connected to the nuclear island waste oil treatment system through a pipeline. The nuclear island waste oil treatment system is configured to treat the non-radioactive oily wastewater.
[0009] In a preferred example, a plurality of first sewage pumps are provided in the first sump, and the first sewage pumps are configured to process and transfer the radioactive oil-free wastewater in the first sump to the conventional island liquid effluent discharge system.
[0010] In a preferred example, the radioactive oil-free wastewater comes from the condensate pump pit sump, multiple water supply pump groups, pipeline low-pressure water discharge, condensate extraction system drainage, equipment and pipeline high-pressure water discharge, and multiple sewage systems.
[0011] In a preferred example, a plurality of second sewage pumps are provided in the second sump, and the second sewage pumps are configured to process and transfer the non-radioactive oily wastewater in the second sump.
[0012] In a preferred example, the rear end of the sump is also connected to the power plant sewage system through a pipeline, and the power plant sewage system is configured to collect and treat the radioactive oil-free wastewater in the first sump during engineering commissioning and unit overhaul.
[0013] In a preferred example, the conventional island waste liquid collection system is located at -8.5m from the turbine room, and the first sewage pump is set at -11.5m.
[0014] In a preferred example, the effective volume of the first sump is 120 m3, and the size of the first sump is 10.8 m×3.95 m×3 m.
[0015] In a preferred example, the second sewage pump is set at -11.5m, and the size of the second sump is 10.8m×2.65m×3m.
[0016] The present application also discloses a method for collecting wastewater from a nuclear power plant, comprising:
[0017] The radioactive non-oiled wastewater is transported to the first sump of the conventional island waste liquid collection system, and the non-radioactive oily wastewater is transported to the second sump of the waste oil and non-radioactive water discharge system;
[0018] transporting the radioactive oil-free wastewater in the first sump to a conventional island liquid effluent discharge system for radioactive material attenuation treatment;
[0019] The non-radioactive oily wastewater in the second sump is transported to the nuclear island waste oil treatment system for treatment.
[0020] In a preferred embodiment, the method further includes: during engineering commissioning and unit overhaul, the oil-free wastewater with a trial radioactivity in the first sump is transported to the power station sewage system for treatment.
[0021] In the embodiments of the present application, by optimizing the design of the turbine house pipe trench and sump, only one sump is provided in the conventional island wastewater collection system to collect radioactive, oil-free wastewater. The remaining non-radioactive, oily wastewater from various sources is directly piped to the waste oil and non-radioactive water discharge systems. This separates the radioactive and oily wastewater for collection, allowing for either radioactive or oil-free wastewater, or oil-free wastewater, to be collected separately. This allows for the separation of wastewater from radioactive wastewater to meet the requirements for classified treatment of nuclear island wastewater, optimizes system design, reduces system equipment configuration and layout space, and thus saves project investment and construction costs.
[0022] Furthermore, the first collection pit of the present application can be connected to the conventional island liquid effluent discharge system and the power plant sewage system respectively. During engineering commissioning and unit overhaul, the wastewater in the first collection pit can be first transported to the power plant sewage system for storage, so that personnel can enter to debug and repair the unit.
[0023] The various technical features disclosed in the above invention content, the various technical features disclosed in the various embodiments and examples below, and the various technical features disclosed in the accompanying drawings can be freely combined with each other to form various new technical solutions (all of which should be deemed to have been recorded in this specification), unless such a combination of technical features is technically infeasible. For example, in one example, feature A+B+C is disclosed, and in another example, feature A+B+D+E is disclosed. Features C and D are equivalent technical means that play the same role. Technically, only one of them needs to be used, and it is impossible to use them at the same time. Feature E can be technically combined with feature C. In this case, the solution of A+B+C+D should not be deemed to have been recorded because it is technically infeasible, while the solution of A+B+C+E should be deemed to have been recorded. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Figure 1This is a schematic structural diagram of a conventional island waste liquid collection system of a nuclear power plant wastewater collection system according to one embodiment of the present application;
[0025] Figure 2 This is a schematic structural diagram of a waste oil and non-radioactive water discharge system of a nuclear power plant wastewater collection system according to one embodiment of the present application;
[0026] Figure 3 is a schematic diagram of the layout of a nuclear power plant wastewater collection system according to one embodiment of the present application;
[0027] Figure 4 It is a flow chart of a method for collecting wastewater from a nuclear power plant according to one embodiment of the present application. DETAILED DESCRIPTION
[0028] In the following description, many technical details are provided to help readers better understand this application. However, those skilled in the art will understand that even without these technical details and various changes and modifications based on the following embodiments, the technical solutions claimed in this application can be implemented.
[0029] the term
[0030] As used herein, "front end" refers to the direction in which liquid is transported from the outside into the sump.
[0031] As used herein, "back end" refers to the direction in which liquid is transported from the sump to the outside world.
[0032] In order to make the objectives, technical solutions and advantages of this application clearer, the implementation methods of this application will be further described in detail below with reference to the accompanying drawings.
[0033] The first embodiment of the present application relates to a nuclear power plant wastewater collection system, which includes a conventional island waste liquid collection system and a waste oil and non-radioactive water discharge system. The system structure diagram of the conventional island waste liquid collection system is shown in FIG. Figure 1 The system structure diagram of the waste oil and non-radioactive water discharge system is shown in Figure 2 shown.
[0034] The conventional island waste liquid collection system includes a single first sump, the first sump is configured to receive radioactive non-oiled wastewater, the rear end of the sump is connected to the conventional island liquid effluent discharge system via a pipeline, and the conventional island liquid effluent discharge system is configured to perform radioactive material attenuation treatment on the radioactive non-oiled wastewater;
[0035] The waste oil and non-radioactive water discharge system includes a single second sump. The front end of the second sump is connected to multiple water feed pump groups, a sealing oil system, and a lubricating oil storage room through pipelines. The second sump is configured to accommodate non-radioactive oily wastewater. The rear end of the second sump is connected to the nuclear island waste oil treatment system through pipelines. The nuclear island waste oil treatment system is configured to treat non-radioactive oily wastewater.
[0036] In an optional embodiment, the nuclear island waste oil treatment system is configured to separate the waste oil from the non-radioactive oily wastewater and then discharge it.
[0037] In an optional embodiment, a plurality of first sewage pumps may be provided in the first sump, and the first sewage pumps are configured to process and transfer the radioactive oil-free wastewater in the first sump to a conventional island liquid effluent discharge system.
[0038] In an optional embodiment, radioactive oil-free wastewater can come from the condensate pit collection well, multiple water pump groups (in this embodiment, it can come from water pump group A, water pump group B and water pump group C), pipeline low-pressure drainage, condensate extraction system drainage, equipment and pipeline high-pressure drainage, and multiple sewage systems.
[0039] In an optional embodiment, non-radioactive oily wastewater can come from multiple water pump groups (in this embodiment, it can come from water pump group A, water pump group B and water pump group C), starting water pumps, sealing oil systems and lubricating oil storage rooms, all of which can be transported to the second collection pit through an oily wastewater main pipe located at -8.5m.
[0040] In an optional embodiment, a plurality of second sewage pumps may be provided in the second sump, and the second sewage pumps are configured to process and transfer the non-radioactive oily wastewater in the second sump.
[0041] In an optional embodiment, a third sewage pump may be provided in the condensate pump pit sump, and the third sewage pump is configured to transfer the wastewater in the condensate pump pit sump to the first sump.
[0042] In an optional embodiment, the rear end of the sump can also be connected to the power plant sewage system through a pipeline. The power plant sewage system is configured to collect and treat radioactive oil-free wastewater in the first sump during engineering commissioning and unit overhaul.
[0043] In an optional embodiment, the conventional island waste liquid collection system is located at -8.5m from the turbine room, and the first sewage pump is set at -11.5m.
[0044] In an optional embodiment, the effective volume of the first sump is 120 m 3 , and the dimensions of the first sump are 10.8 m×3.95 m×3 m.
[0045] In an optional embodiment, the second sewage pump is set at -11.5m, and the size of the second sump is 10.8m×2.65m×3m.
[0046] In order to better understand the technical solution of the present application, a specific example is provided below for illustration. The details listed in the example are mainly for ease of understanding and are not intended to limit the scope of protection of the present application.
[0047] The layout diagram of the nuclear power plant wastewater collection system is as follows: Figure 3 As shown, the entire system is divided into two systems: one for the conventional island waste liquid collection system and the other for the waste oil and non-radioactive water discharge system. The conventional island waste liquid collection system in this application only has one first sump, and does not include additional sumps. This conventional island waste liquid collection system primarily processes non-oil wastewater from conventional island plant systems and equipment pipeline drainage, as well as equipment maintenance. If a nuclear island steam generator leaks, the wastewater may contain radioactivity, so the first sump is primarily used to accommodate radioactive, non-oil wastewater.
[0048] Radioactive, oil-free wastewater primarily originates from wastewater in the condensate pump sump, low-pressure drainage from equipment on each floor (including multiple water supply pump units) and pipelines, high-pressure drainage from equipment and pipelines on each floor, and drainage from the condensate extraction system. All of this is collected through pipelines at the front end of the first sump into the first sump. Multiple first sewage pumps (preferably four) can be installed in the first sump. During normal operation, the radioactive, oil-free wastewater in the first sump can be pumped by the first sewage pumps to the conventional island liquid effluent discharge system at the rear end of the first sump (which can be a waste liquid storage tank within the conventional island liquid effluent discharge building) for centralized radioactive attenuation treatment before centralized discharge. During engineering commissioning or unit overhaul, the radioactive, oil-free wastewater in the first sump can be pumped by the first sewage pumps to the power plant sewage system at the rear end of the first sump for treatment, and discharged as wastewater that meets environmental discharge requirements, containing neither radioactivity nor oil.
[0049] The main equipment of the conventional island waste liquid collection system is located at the -8.5m floor of the turbine house. Four first sewage pumps are arranged in the first sump of the turbine (-11.5m). The dimensions of the first sump are 10.8m×3.95m×3m (effective volume is 120m3).
[0050] The waste oil and non-radioactive water discharge system includes a secondary sump for non-radioactive oily wastewater. This non-radioactive oily wastewater primarily originates from the turbine lubricating oil storage and delivery system, the turbine oil system, the generator seal oil system, and the feedwater pump system. This wastewater is collected in the secondary sump via a single main pipe. Multiple secondary sewage pumps (preferably two) can be installed in the secondary sump to discharge the oily wastewater into the nuclear island waste oil treatment system for treatment.
[0051] The second embodiment of the present application relates to a method for collecting wastewater from a nuclear power plant, the flow chart of which is as follows: Figure 4 As shown, the method includes:
[0052] In step 101, radioactive oil-free wastewater is transported to a first sump of a conventional island waste liquid collection system, and non-radioactive oily wastewater is transported to a second sump of a waste oil and non-radioactive water discharge system.
[0053] In step 102, the radioactive oil-free wastewater in the first sump is transported to a conventional island liquid effluent discharge system for radioactive material attenuation treatment.
[0054] In step 103, the non-radioactive oily wastewater in the second sump is transported to the nuclear island waste oil treatment system for treatment.
[0055] In an optional embodiment, the method may further include: during engineering commissioning and unit overhaul, the oil-free wastewater with a trial radioactivity in the first sump is transported to the power station sewage system for treatment.
[0056] This embodiment is a method embodiment corresponding to the first embodiment. The technical details in the first embodiment can be applied to this embodiment, and the technical details in this embodiment can also be applied to the first embodiment.
[0057] It should be noted that, in this application, relational terms such as first and second are merely used to distinguish one entity or operation from another, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprise," "include," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article, or device. Without further restriction, an element defined by the phrase "comprising a" does not exclude the presence of other identical elements in the process, method, article, or device comprising the element. In this application, if it is mentioned that an action is performed according to a certain element, it means that the action is performed at least according to that element, including two situations: performing the action only according to that element, and performing the action according to that element and other elements. Expressions such as "multiple," "multiple," and "multiple" include 2, 2 times, 2 kinds, and more than 2, more than 2 times, and more than 2 kinds.
[0058] The serial numbers used in describing the steps of a method do not themselves limit the order of these steps. For example, a step with a larger serial number does not necessarily have to be executed after a step with a smaller serial number. The step with a larger serial number can be executed first and then the step with a smaller serial number, or they can be executed in parallel, as long as this execution order is reasonable to those skilled in the art. For another example, having multiple steps with consecutive serial numbers (e.g., step 101, step 102, step 103, etc.) does not limit other steps that can be executed in between. For example, there can be other steps between step 101 and step 102.
[0059] This specification includes combinations of the various embodiments described herein. Individual references to embodiments (e.g., "one embodiment" or "some embodiments" or "preferred embodiments") are not mutually exclusive unless indicated as such or clear to one skilled in the art. It should be noted that the word "or" is used in this specification in a non-exclusive sense unless the context clearly indicates or requires otherwise.
[0060] All documents mentioned in this specification are considered to be included in their entirety in the disclosure of this application so that they can be used as a basis for modification when necessary. In addition, it should be understood that the above description is only a preferred embodiment of this specification and is not intended to limit the scope of protection of this specification. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of one or more embodiments of this specification should be included in the scope of protection of one or more embodiments of this specification.
Claims
1. A nuclear power plant wastewater collection system, characterized in that: include: Conventional island waste collection system and waste oil and non-radioactive water discharge system; The conventional island waste liquid collection system includes a single first sump, which is configured to accommodate radioactive oil-free wastewater. The rear end of the sump is connected to the conventional island liquid effluent discharge system through a pipeline. The conventional island liquid effluent discharge system is configured to perform radioactive material attenuation treatment on the radioactive oil-free wastewater. The waste oil and non-radioactive water discharge system includes a single second sump, the front end of which is connected to multiple water feed pump groups, a sealing oil system, and a lubricating oil storage room through a pipeline. The second sump is configured to accommodate non-radioactive oily wastewater, and the rear end of the second sump is connected to the nuclear island waste oil treatment system through a pipeline. The nuclear island waste oil treatment system is configured to treat the non-radioactive oily wastewater.
2. The nuclear power plant wastewater collection system according to claim 1, characterized in that: A plurality of first sewage pumps are provided in the first sump, and the first sewage pumps are configured to process and transfer the radioactive oil-free wastewater in the first sump to the conventional island liquid effluent discharge system.
3. The nuclear power plant wastewater collection system according to claim 1, characterized in that: The radioactive oil-free wastewater comes from the condensate pump pit sump, multiple water supply pump groups, pipeline low-pressure water discharge, condensate extraction system drainage, equipment and pipeline high-pressure water discharge, and multiple sewage systems.
4. The nuclear power plant wastewater collection system according to claim 1, characterized in that: A plurality of second sewage pumps are provided in the second sump, and the second sewage pumps are configured to process and transfer the non-radioactive oily wastewater in the second sump.
5. The nuclear power plant wastewater collection system according to claim 1, characterized in that: The rear end of the sump is also connected to the power plant sewage system through a pipeline. The power plant sewage system is configured to collect and treat the radioactive oil-free wastewater in the first sump during engineering commissioning and unit overhaul.
6. The nuclear power plant wastewater collection system according to claim 2, characterized in that: The conventional island waste liquid collection system is located at -8.5m from the turbine room, and the first sewage pump is set at -11.5m.
7. The nuclear power plant wastewater collection system according to claim 1, characterized in that: The effective volume of the first sump is 120 m3, and the dimensions of the first sump are 10.8 m×3.95 m×3 m.
8. The nuclear power plant wastewater collection system according to claim 4, characterized in that: The second sewage pump is set at -11.5m, and the size of the second sump is 10.8m×2.65m×3m.
9. A method for collecting wastewater from a nuclear power plant, characterized in that: include: The radioactive non-oiled wastewater is transported to the first sump of the conventional island waste liquid collection system, and the non-radioactive oily wastewater is transported to the second sump of the waste oil and non-radioactive water discharge system; transporting the radioactive oil-free wastewater in the first sump to a conventional island liquid effluent discharge system for radioactive material attenuation treatment; The non-radioactive oily wastewater in the second sump is transported to the nuclear island waste oil treatment system for treatment.
10. The method for collecting wastewater from a nuclear power plant according to claim 9, wherein: Also includes: During engineering commissioning and unit overhaul, the radioactive oil-free wastewater in the first sump is transported to the power station sewage system for treatment.