Nuclear power plant wastewater collection system
By optimizing the design of the wastewater collection system of nuclear power plants, only one first water pit is set up to collect radioactive oil-free wastewater, and directly transporting the non-radioactive oil-containing wastewater through the pipeline to the waste oil and non-radioactive water discharge system, the complex and cost-effective problems of existing system design are solved, and the system simplification and cost-saving effects are achieved.
Patent Information
- Application Number
- CN202420595801.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-26
- Publication Date
- 2025-04-11
- Estimated Expiration
- 2034-03-26
AI Technical Summary
The design of existing nuclear power plant wastewater collection systems is complex, and it is necessary to add oil and water separator equipment and water collection pits, resulting in increased equipment investment and space occupation, resulting in increased economic and structural costs.
Optimize the design of the wastewater collection system, and set up only a first water pit to collect radioactive oil-free wastewater, and directly transport radioactive oil-containing wastewater to the waste oil and non-radioactive water discharge system through the pipeline for classified collection and treatment.
Through optimized design, the system equipment configuration and layout space is reduced, project investment and engineering cost are saved, and the classification and treatment requirements of nuclear island wastewater are met.
Smart Images
Figure CN222749240U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of nuclear power plants, and in particular to a wastewater collection system for nuclear power plants. 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. The description herein is not admitted to be prior art as disclosed by virtue of its inclusion in this section.
[0003] In the 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 has two WLC oily wastewater pits. The WLC1 pit collects oily and radioactive wastewater from the water pump trench sump. The waste oil in the oily wastewater is separated by an oil-water separation device and then discharged into the WLC2 pit. The WLC2 pit collects water from the condensate pump pit and the drain expansion tank sump as well as the equipment and pipelines on each floor. Finally, the radioactive non-oily wastewater in the WLC2 pit is discharged into the wastewater treatment system (WQB system) for unified radioactive material attenuation treatment before centralized discharge.
[0004] In this design, medium-pressure water supply pipes and filters and other equipment and pipes are arranged in the feedwater pump trench. The discharge of water from the pipes and filters has the potential risk of radioactivity. When the feedwater pump group is overhauled due to equipment failure, waste oil may leak into the water supply trench and mix with radioactive wastewater to form radioactive oily wastewater. Since the WQB system can only treat radioactive wastewater and does not allow oily wastewater to be discharged, based on the requirements of nuclear island wastewater treatment, radioactive oily wastewater must be treated before being discharged into the WQB system, and waste oil and wastewater are treated separately by setting up an oil-water separator. Therefore, the original design system is relatively complex, and it is necessary to add a set of oil-water separator equipment and a sump for collecting radioactive oily wastewater and sewage pumps for other trenches, which not only increases the investment cost of equipment and pipelines, but also occupies a large space in the steam turbine room, and the cost of the plant structure is also increased accordingly. Summary of the invention
[0005] The purpose of this application is to provide a nuclear power plant wastewater collection system, which can optimize the design of the nuclear power plant wastewater collection system, reduce the system equipment configuration and layout space, thereby saving project investment and engineering cost.
[0006] The present application discloses a nuclear power plant wastewater collection system, including: 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, the first sump is configured to contain radioactive oil-free wastewater, the rear end of the sump is connected to the conventional island liquid effluent discharge system through a pipeline, and 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 a plurality of water feed pump groups, a sealing oil system and a lubricating oil storage room via a pipeline, the second sump is configured to accommodate non-radioactive oily wastewater, the rear end of which is connected to a nuclear island waste oil treatment system via a pipeline, the nuclear island waste oil treatment system being 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 a condensate pump pit sump, multiple water supply pump groups, low-pressure pipeline drainage, condensate extraction system drainage, equipment and pipeline high-pressure drainage, 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 arranged 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, a third sewage pump is further included, and the third sewage pump is arranged in the condensate pump pit sump.
[0016] In a preferred example, the size of the condensate pump pit sump is 1.5m×1.5m×1m.
[0017] In the implementation mode of the present application, by optimizing the design of the turbine room pipe trench and the sump, only one sump is provided in the conventional island waste liquid collection system to collect radioactive oil-free wastewater, while the remaining non-radioactive oil-containing wastewater from various sources is directly transported to the waste oil and non-radioactive water discharge system through pipelines, and the radioactive wastewater and oil-containing wastewater are collected by classification, so that the wastewater can be radioactive but not oil-free or oil-containing but not radioactive, and wastewater of different properties can be collected by classification, thereby meeting the requirements for classified treatment of nuclear island wastewater, optimizing the system design, reducing the system equipment configuration and layout space, and thus saving project investment and engineering cost;
[0018] Furthermore, the first collection pit of the present application can be connected to the conventional island liquid effluent discharge system and the power station sewage system respectively. During engineering commissioning and unit overhaul, the wastewater in the first collection pit can be first transported to the power station sewage system for storage, so that personnel can enter to debug and repair the unit.
[0019] Each technical feature disclosed in the above invention content, each technical feature disclosed in each implementation mode and example below, and each technical feature disclosed in the accompanying drawings can be freely combined with each other to form various new technical solutions (these technical solutions should be deemed to have been recorded in this specification), unless such 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, and features C and D are equivalent technical means that play the same role. Technically, only one of them can be used, and it is impossible to use them at the same time. Feature E can be combined with feature C technically. Then, 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
[0020] Figure 1 It 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;
[0021] Figure 2 is a schematic diagram of the structure 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;
[0022] Figure 3 It is a schematic diagram of the layout of a nuclear power plant wastewater collection system according to one embodiment of the present application. DETAILED DESCRIPTION
[0023] In the following description, many technical details are provided to help readers better understand the present application. However, those skilled in the art can understand that the technical solution claimed in the present application can be implemented even without these technical details and various changes and modifications based on the following embodiments.
[0024] the term
[0025] As used herein, "front end" refers to the direction in which liquid is transported from the outside into the sump.
[0026] As used herein, "rear end" refers to the direction in which liquid is transported from within the sump to the outside.
[0027] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below in conjunction with the accompanying drawings.
[0028] 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.
[0029] The conventional island waste liquid collection system includes a single first sump, the first sump is configured to contain radioactive oil-free wastewater, the rear end of the sump is connected to the conventional island liquid effluent discharge system through a pipeline, and the conventional island liquid effluent discharge system is configured to perform radioactive material attenuation treatment on the radioactive oil-free wastewater;
[0030] The waste oil and non-radioactive water discharge system includes a single second sump, the front end of which is connected to a plurality of feed water pump groups, a sealing oil system and a lubricating oil storage room through a pipeline, and 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 dirty oil treatment system through a pipeline, and the nuclear island dirty oil treatment system is configured to treat non-radioactive oily wastewater.
[0031] 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.
[0032] 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.
[0033] 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.
[0034] In an optional embodiment, non-radioactive oily wastewater can come from multiple water supply pump groups (in this embodiment, it can come from water supply pump group A, water supply pump group B and water supply pump group C), starting water supply 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.
[0035] 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.
[0036] 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.
[0037] 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.
[0038] 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.
[0039] In an optional embodiment, 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.
[0040] 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.
[0041] The layout of the nuclear power plant wastewater collection system is shown in the figure below. Figure 3 As shown, the whole is divided into two systems, one of which is a conventional island waste liquid collection system, and the other is a waste oil and non-radioactive water discharge system. A conventional island waste liquid collection system of the present application is provided with only one first sump, and does not include more sump. The conventional island waste liquid collection system mainly processes the conventional island plant system and equipment pipeline drainage and non-oil wastewater from equipment maintenance. If a nuclear island steam generator leaks, the wastewater may contain radioactivity, so the first sump is mainly used to accommodate radioactive non-oil wastewater.
[0042] The radioactive oil-free wastewater mainly comes from the wastewater in the condensate pump pit, the low-pressure drainage of each layer of equipment (including multiple water supply pump group equipment) and pipelines, the high-pressure drainage of each layer of equipment and pipelines, and the drainage of the condensate extraction system, all of which are collected into the first sump through the pipeline via the front end of the first sump. Multiple first sewage pumps (preferably 4) can be set in the first sump. During normal operation, the radioactive oil-free wastewater in the first sump can be transported to the conventional island liquid effluent discharge system at the rear end of the first sump by the first sewage pump (the system can be a waste liquid storage tank in the conventional island liquid effluent discharge plant) for unified radioactive material attenuation treatment before centralized discharge. During engineering commissioning or unit overhaul, the radioactive oil-free wastewater in the first sump can be transported to the power station sewage system at the rear end of the first sump by the first sewage pump for treatment, and sewage that meets environmental discharge requirements is discharged, which is neither radioactive nor oil-free.
[0043] The main equipment of the conventional island waste liquid collection system is located at the -8.5m floor of the turbine room. Four first sewage pumps are arranged in the first sump of the turbine (-11.5m). The size of the first sump is 10.8m×3.95m×3m (effective volume is 120m3).
[0044] A second sump is provided in the waste oil and non-radioactive water discharge system, and the second sump is used to accommodate non-radioactive oily wastewater. Non-radioactive oily wastewater mainly comes from the turbine lubricating oil storage and delivery system, turbine oil system, generator sealing oil system and feed water pump group, and can be collected into the second sump through a main pipe. Multiple second sewage pumps (preferably 2) can be set in the second sump, and the oily wastewater in the second sump can be discharged into the nuclear island waste oil treatment system for treatment through the second sewage pump.
[0045] It should be noted that, in the present application, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the term "include", "comprise" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or equipment. In the absence of more restrictions, the elements defined by the sentence "include one" do not exclude the existence of other identical elements in the process, method, article or equipment including the elements. In the present application, if it is mentioned that a certain action is performed according to a certain element, it means at least the meaning of performing the action according to the element, which includes two situations: performing the action only according to the element and performing the action according to the element and other elements. Multiple, multiple, multiple, etc. expressions include 2, 2 times, 2 kinds and more than 2, more than 2 times, more than 2 kinds.
[0046] This specification includes combinations of the various embodiments described herein. Individual references to embodiments (e.g., "one embodiment" or "some embodiments" or "preferred embodiments"); however, these embodiments are not mutually exclusive unless indicated as mutually exclusive or it is clear to a person skilled in the art that they are mutually exclusive. 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.
[0047] All documents mentioned in this specification are considered to be included in the disclosure of this application as a whole, so that they can be used as a basis for modification when necessary. In addition, it should be understood that the above 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 liquid collection system and waste oil and non-radioactive water discharge system; The conventional island waste liquid collection system includes a single first sump, the first sump is configured to contain radioactive oil-free wastewater, the rear end of the first sump is connected to the conventional island liquid effluent discharge system through a pipeline, and 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 a plurality of water feed pump groups, a sealing oil system and a lubricating oil storage room via a pipeline, the second sump is configured to accommodate non-radioactive oily wastewater, the rear end of which is connected to a nuclear island waste oil treatment system via a pipeline, the nuclear island waste oil treatment system being 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 disposed 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 drainage, condensate extraction system drainage, equipment and pipeline high-pressure drainage, 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 arranged 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 station sewage system through a pipeline, and the power station 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 of the turbine room, and the first sewage pump is arranged 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 120m3, and the size of the first sump is 10.8m×3.95m×3m.
8. The nuclear power plant wastewater collection system according to claim 3, characterized in that: It also includes a third sewage pump, which is arranged in the condensate pump pit sump.
9. The nuclear power plant wastewater collection system according to claim 8, characterized in that: The size of the condensate pump pit sump is 1.5m×1.5m×1m.