Rainwater recycling and discharging system with multiple water outlets

Abstract

The rainwater recycling and discharging system is characterized in that the rainwater recycling and discharging system comprises an initial rainwater collecting pool, a middle flow guide pool and a self-flowing discharging pool, the middle flow guide pool is provided with a waste filtering device, and the rainwater recycling and discharging system further comprises a first water passing hole, a second water passing hole and a third water passing hole with the elevation from low to high; after passing through the waste filtering device, the rainwater is configured to pass through one of the following three flow paths: a first flow path, the rainwater enters the initial rainwater collecting tank for storage through a first water passing hole, and is configured to be conveyed to a water treatment system through a rainwater recycling water pump; the second flow path is used for enabling the rainwater to enter the self-flowing discharge pool through a second water passing hole; at the moment, the third water passing hole is closed; the rainwater passes through a third water passing hole and is configured to pass through a rainwater pump to be boosted and discharged to the outside of the plant; at the moment, the second water passing hole is closed. According to the rainwater recycling and discharging system, the purposes that the occupied area of the rainwater recycling and discharging system is small, initial dirty rainwater is not discharged, water resources are saved, and energy is saved and consumption is reduced can be achieved.

Description

Technical Field

[0001] The present application relates to the field of rainwater collection and utilization, and in particular to a rainwater recycling and discharge system with multiple drainage outlets. Background Art

[0002] With the increasing requirements for environmental protection, water conservation, energy conservation and consumption reduction in power plants, there is an urgent need and great significance for the unified solution of a series of problems such as the effective collection, storage, recycling, gravity flow and pressure flow of rainwater in the plant.

[0003] According to the increasingly stringent environmental requirements for rainwater discharge, rainwater runoff pollution in the factory area must be effectively controlled to prevent early polluted rainwater from being discharged into the surface water system outside the factory and affecting the ecological environment. Therefore, it is necessary to build a pool for collecting early rainwater in the factory area.

[0004] In addition, making full use of rainwater resources can effectively reduce the external water supply of power plants, save water resources, and reduce the water intake costs of power plants.

[0005] For medium and large power plants, they usually occupy a large area, and the amount of rainwater in the summer rainy season is very large. The rainwater pump has a large power and is a high-power equipment in the power plant. For example, the two 1000MW units in East China have a total rainwater pump power of about 1000kW. If the operation frequency of the rainwater pump is reduced, the power consumption of the power plant can be reduced, and the energy-saving effect is obvious. Therefore, for power plants where the rainwater in the plant area has the conditions for gravity discharge when the rainwater discharge point is at a low water level, but the rainwater in the plant area cannot be discharged by gravity when the rainwater discharge point is at a high water level, the favorable conditions of the rainwater discharge point at a low water level should be fully utilized to discharge the rainwater in the plant area by gravity to the outside of the plant.

[0006] At present, the rainwater recycling and discharge system of power plants is mainly composed of maintenance gates, water collection tanks, trash racks, rainwater pumps, pressure flow drainage pipes and rainwater recycling pumps, such as Figure 1 As shown. When the amount of rainwater in this system is less than or equal to the flow rate of the rainwater recycling pump, the rainwater in the water collection tank is boosted by the rainwater recycling pump and discharged to the water treatment system for recycling; when the amount of rainwater is greater than the flow rate of the rainwater recycling pump, the water level in the water collection tank continues to rise. When it rises to the set water level, the rainwater pump is turned on to boost the excess rainwater and discharge it to the discharge point outside the plant. When the water level in the water collection tank drops to the set water level, the rainwater pump stops. After the water level in the water collection tank of this system rises to the set water level, the rainwater pump directly discharges the initial dirty rainwater in the water collection tank to the outside of the plant, affecting the surface water quality outside the plant. For power plants where the rainwater in the plant area has the conditions for gravity discharge when the rainwater discharge point is at a low water level, but the rainwater in the plant area cannot be discharged by gravity when the rainwater discharge point is at a high water level, generally only pressure flow discharge is set, and gravity drainage pipes and pressure flow drainage pipes are rarely set at the same time, which is not conducive to energy saving and consumption reduction of power plants.

[0007] In the currently designed rainwater recycling and discharge system, the rainwater in the factory area is discharged by gravity when the water level at the rainwater discharge point is low, but cannot be discharged by gravity when the water level at the rainwater discharge point is high. Most of the rainwater is collected by the rainwater pipe network in the factory area and discharged directly into the rainwater pump room. Then, the excess rainwater that cannot be recycled is discharged outside the factory through the rainwater lifting pump. Multiple drainage outlets for gravity and pressure flow are rarely set, and independent initial rainwater collection tanks are not set.

[0008] The above-mentioned rainwater recycling and discharge system can ensure that rainwater is not discharged and realize the initial rainwater recycling and utilization only when the amount of rainwater is small, the water level in the rainwater pump room is low, and the rainwater pump is not started. For the southern and coastal areas, the amount of rainwater is usually large in summer, and the initial dirty rainwater is directly discharged to the outside of the factory by the rainwater pump in the rainwater pump room. It is impossible to isolate the initial dirty rainwater from being discharged, and the rainwater pump still needs to be started when the gravity flow conditions are met, which consumes a lot of electricity.

[0009] Power plants are large consumers of water and energy. For two 1000MW units, the maximum fresh water consumption in summer can reach about 3500m 3 / h, the total power of the rainwater pump is about 1000kW. Collecting, storing, recycling and discharging rainwater by gravity as much as possible is of great significance to the environmental protection, water conservation and energy saving of power plants. Summary of the invention

[0010] The purpose of this application is to provide a rainwater recycling and discharge system with multiple drainage outlets, which centrally integrates the initial rainwater collection pool, gravity discharge outlet and pressure flow discharge outlet, optimizes the layout of the rainwater recycling and discharge system, and reduces investment.

[0011] The present application discloses a rainwater recycling and discharge system with multiple drainage outlets, including: an initial rainwater collection pool, an intermediate diversion pool, and a gravity discharge pool, wherein the intermediate diversion pool is provided with a waste filtering device, and also includes, from low to high elevations: a first water hole, a second water hole, and a third water hole;

[0012] After passing through the waste filter, rainwater is configured to flow through one of three paths:

[0013] In the first flow path, rainwater passes through the first water hole, enters the initial rainwater collection tank for storage, and is configured to be sent to the water treatment system through the rainwater reuse water pump;

[0014] In the second flow path, rainwater passes through the second water hole and enters the gravity drainage pool; at this time, the third water hole is closed;

[0015] In the third flow path, rainwater passes through the third water hole and is configured to be discharged outside the factory through a rainwater pump at a boosted pressure; at this time, the second water hole is closed.

[0016] In a preferred example, the third flow path further includes a rainwater pump house front pool arranged after the intermediate diversion pool, and the rainwater pump house front pool is configured to provide a buffer space in front of the rainwater pump house.

[0017] In a preferred example, a gate is provided between the rainwater pump house front pool and the rainwater pump house.

[0018] In a preferred example, in the first flow path, when the rainwater reaches the height of the first water hole, the rainwater recycling pump is turned on.

[0019] In a preferred example, when the rainwater level is higher than the elevation of the second water hole but lower than the elevation of the third water hole, the second water hole is opened and the rainwater passes through the second flow path.

[0020] In a preferred example, when the rainwater level is higher than the elevation of the third water passage, the third water passage is opened and the rainwater flows into the third flow path.

[0021] In a preferred example, the opening and closing of the second water hole is performed by an electric gate.

[0022] In a preferred embodiment, the height of the first water hole relative to the plane of the intermediate diversion pool is H1 meters, and the height of the second water hole is (H1+0.1) meters; and / or

[0023] The height of the third water hole is (H1+0.5) meters.

[0024] This application has at least the following technical effects:

[0025] (1) This system is applicable to rainwater recycling and discharge systems of nuclear power and thermal power units of 300MW and above, substations of 220kV and above, and converter stations.

[0026] (2) Optimize the layout of rainwater recycling and discharge systems, and centrally integrate the initial rainwater collection pool, gravity discharge outlet and pressure flow discharge outlet. On the premise of meeting various functions, it can not only save land and facilitate the unified planning of the factory area, but also reduce investment.

[0027] (3) Collect and isolate initial rainwater in the factory area to prevent the discharge of initial dirty rainwater and pollute the external water ecological environment, which has great environmental benefits.

[0028] (4) Utilize the water storage capacity of the initial rainwater collection pool to collect initial rainwater and small rainfall rainwater, process and reuse the initial rainwater collection pool to save water resources. In addition, reduce the external water supply of the power plant and reduce the water intake cost of the power plant.

[0029] (5) Set up gravity drainage pipes. When the drainage meets the gravity conditions, the clean excess rainwater will be discharged to the outside of the factory by gravity, reducing the operation of rainwater pumps, saving energy and reducing consumption, and reducing the factory's electricity consumption rate.

[0030] (6) Set up an intermediate diversion pool. The intermediate diversion pool will first divert the initial rainwater to the initial rainwater collection pool, so that the initial dirty rainwater will not be discharged. The rainwater in the initial rainwater collection pool will be sent to the water treatment system through the rainwater recycling water pump for treatment and reuse. After the initial rainwater collection pool reaches the set water level, the intermediate diversion pool can ensure that the initial dirty rainwater in the initial rainwater collection pool does not flow back, and divert the excess rainwater to the gravity drainage pool or rainwater pump room, and finally discharge the excess rainwater outside the factory. The setting of the intermediate diversion pool can not only solve the problem of initial rainwater pollution, but also ensure that rainwater resources are fully utilized.

[0031] The specification of the present application records a large number of technical features, which are distributed in various technical solutions. If all possible combinations of technical features of the present application (i.e., technical solutions) are to be listed, the specification will be too long. In order to avoid this problem, the various technical features disclosed in the above-mentioned invention content of the present application, 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 (these technical solutions should all be regarded as having been recorded in this specification), unless the combination of such 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 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 regarded as having been recorded because it is technically infeasible, and the solution of A+B+C+E should be regarded as having been recorded. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a plan view of a traditional rainwater recycling and drainage system;

[0033] Figure 2 It is a plan view of a rainwater recycling and discharge system with multiple drainage outlets of the present application; Figure 3 It is a cross-sectional schematic diagram of the rainwater recycling and discharge system with multiple drainage outlets of the present application. DETAILED DESCRIPTION

[0034] After extensive and in-depth research, the inventors of the present application have proposed a new type of rainwater recycling and discharge system that integrates multiple functions such as initial rainwater collection, rainwater recycling, rainwater gravity discharge and rainwater pressure flow discharge, in response to the current problems of difficult to control initial dirty rainwater discharge in power plants, waste of rainwater resources and high energy consumption of rainwater pumps. The system can achieve the goals of saving land occupation, preventing the discharge of initial dirty rainwater, saving water resources and reducing energy consumption.

[0035] 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.

[0036] the term

[0037] Multiple drainage outlets: When the water level at the rainwater discharge point is high, it is discharged through the pressure flow drain pipe; when the water level at the rainwater discharge point is low, it is discharged through the gravity drain pipe to achieve the purpose of energy saving and consumption reduction.

[0038] Rainwater recycling and discharge system: By setting up trash racks, initial rainwater collection pools, water holes, recycled water pumps, gates, gravity drain pipes, rainwater pumps, pressure flow drain pipes and other measures, a rainwater system with rainwater collection and reuse, gravity discharge and pressure flow discharge is realized.

[0039] The following is a brief description of some innovative aspects of the implementation methods of this application:

[0040] The rainwater recycling and discharge system with multiple drainage outlets includes: an initial rainwater collection pool, an intermediate diversion pool, and a gravity discharge pool, wherein the intermediate diversion pool is provided with a waste filtering device, and also includes, from low to high elevations: a first water hole, a second water hole, and a third water hole.

[0041] After passing through the waste filter, rainwater is configured to flow through one of three paths:

[0042] In the first flow path, rainwater passes through the first water hole, enters the initial rainwater collection pool for storage, and is configured to be sent to the water treatment system through the rainwater recycling water pump. In the first flow path, when the rainwater reaches the height of the first water hole, the rainwater recycling water pump is turned on.

[0043] In the second flow path, rainwater passes through the second water hole and enters the gravity drainage pool. When the rainwater level is higher than the elevation of the second water hole but lower than the elevation of the third water hole, the second water hole is opened and rainwater passes through the second flow path. In a preferred embodiment, the opening and closing of the second water hole is performed by an electric gate. At this time, the third water hole is closed.

[0044] The third flow path, rainwater passes through the third water hole, and is configured to be discharged outside the factory through the rainwater pump and boosted. When the rainwater level is higher than the elevation of the third water hole, the third water hole opens and rainwater flows into the third flow path. At this time, the second water hole is closed.

[0045] In a preferred embodiment, the third flow path also includes a rainwater pump house forepool arranged after the intermediate diversion pool, and the rainwater pump house forepool is configured to provide a buffer space in front of the rainwater pump house; a gate is arranged between the rainwater pump house forepool and the rainwater pump house.

[0046] like Figure 3 As shown, in a preferred embodiment, the height of the first water hole relative to the plane of the intermediate flow guide pool is H1 meter, the height of the second water hole is (H1+0.1) meter, and the height of the third water hole is (H1+0.5) meter.

[0047] The system configuration of this application and its corresponding technical effects are:

[0048] (1) Trash racks are placed behind the rainwater inlet pipe to intercept large garbage such as plastic bags, branches, and leaves in the rainwater, and to filter the rainwater entering the initial rainwater collection pool, gravity drainage pool, and rainwater pump room to a certain extent.

[0049] (2) After passing through the trash rack, rainwater enters the intermediate diversion pool. The intermediate diversion pool is provided with water holes A, B and C with different water flow directions. The bottom elevations of water holes B and C are higher than the top elevation of water hole A. The initial rainwater enters the initial rainwater collection pool through the water inlet A and is finally pumped to the water treatment system for treatment and reuse.

[0050] (3) An electric gate is installed at the water hole B. The bottom elevation of water hole B is lower than that of water hole C. When the water level in the intermediate diversion pool is higher than the bottom elevation of water hole B and the water level at the drainage point outside the factory is lower than the bottom elevation of water hole B, the electric gate is opened and the excess rainwater is discharged into the gravity drainage pool. No water flows through water hole C, and the rainwater is finally discharged to the outside of the factory through the gravity drainage pipe.

[0051] (4) When the water level at the drainage point outside the factory is higher than the bottom elevation of the water hole B, the electric gate is in the closed state. As the water level in the intermediate diversion pool exceeds the bottom elevation of the water hole C, the excess rainwater is discharged into the front pool of the rainwater pump room and finally discharged to the outside of the factory through the rainwater pump to boost the pressure.

[0052] 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.

[0053] Embodiment 1,

[0054] Rainwater recycling and drainage system with multiple drainage outlets such as Figure 2 As shown, along the direction of rainwater flow, there are: rainwater inlet pipe; trash rack; intermediate diversion pool; water hole A, initial rainwater collection pool, rainwater recycling water pump; water hole B, electric gate, gravity discharge pool, gravity drainage pipe; water hole C, rainwater pump room front pool, maintenance gate, rainwater pump, pressure flow drainage pipe, etc.

[0055] Initial rainwater collection function: The trash rack behind the rainwater inlet pipe intercepts larger garbage such as plastic bags, branches and leaves in the rainwater; because the bottom elevations of water holes B and C are higher than the top elevations of water holes A, the initial rainwater passing through the trash rack first enters the initial rainwater collection pool through water hole A in the middle diversion pool. When the water level in the initial rainwater collection pool rises to the top elevation of water hole A, the initial dirty rainwater is stored in the initial rainwater collection pool and sent to the water treatment system for treatment and reuse through the rainwater recycling water pump, while water holes B and C do not flow through. Figure 2 and Figure 3 Process ①.

[0056] Gravity drainage function: When the water level in the intermediate diversion pool rises to the bottom elevation of the water hole B, if the water level at the drainage point outside the factory is lower than the bottom elevation of the water hole B, the electric gate of the water hole B can be opened. At this time, the clean excess rainwater is discharged into the gravity drainage pool, and the water hole C does not flow. The rainwater is finally discharged to the outside of the factory through the gravity drainage pipe. See details. Figure 2 and Figure 3 Process ②.

[0057] Pressure flow drainage function: When the water level in the intermediate diversion pool and the initial rainwater collection pool rises to the bottom elevation of the water hole B, if the water level at the drainage point outside the factory is higher than the bottom elevation of the water hole B, the electric gate of the water hole B will remain closed. At this time, the water level in the intermediate diversion pool and the initial rainwater collection pool will continue to rise. When the intermediate diversion pool rises to the bottom elevation of the water hole C, the clean excess rainwater will be discharged into the front pool of the rainwater pump room, and finally discharged to the outside of the factory through the rainwater pump. See details Figure 2 and Figure 3 Process ③.

[0058] Function of preventing initial rainwater from flowing back: by setting different elevations of water hole A, water hole B and water hole C, the bottom elevations of water hole B and water hole C are higher than the top elevation of water hole A, which fully ensures that the initial rainwater is first completely diverted to the initial rainwater collection pool instead of flowing to the gravity discharge pool and rainwater pump room. When the excess rainwater after the initial rainwater collection is discharged, the water absorption of the rainwater recycling pump and the water hole A are in a submerged state, which fully ensures that the dirty initial rainwater in the initial rainwater collection pool is always stored in the pool and will not flow back through the water hole A.

[0059] It should be noted that in the application documents of this patent, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including 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. In the absence of further restrictions, the elements defined by the sentence "including one" do not exclude the existence of other identical elements in the process, method, article or device including the elements. In the application documents of this patent, if it is mentioned that an action is performed according to an element, it means that the action is performed at least 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. 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.

[0060] This specification includes combinations of the various embodiments described herein. Individual references to "one embodiment" or a particular embodiment, etc., do not necessarily refer to the same embodiment; however, these embodiments are not mutually exclusive unless indicated as mutually exclusive or clear to those 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.

[0061] All documents mentioned in this application are considered to be included in the disclosure of this application as a whole, so that they can be used as the basis for modification when necessary. In addition, it should be understood that after reading the above disclosure of this application, those skilled in the art can make various changes or modifications to this application, and these equivalent forms also fall within the scope of protection claimed in this application.

Claims

1. A rainwater recycling and discharge system with multiple drainage outlets, characterized in that: include: An initial rainwater collection pool, an intermediate diversion pool, and a gravity drainage pool, wherein the intermediate diversion pool is provided with a waste filtering device, and also includes, from low to high elevations: a first water hole, a second water hole, and a third water hole; After passing through the waste filter, rainwater is configured to flow through one of three paths: In the first flow path, rainwater passes through the first water hole, enters the initial rainwater collection tank for storage, and is configured to be sent to the water treatment system through the rainwater reuse water pump; In the second flow path, rainwater passes through the second water hole and enters the gravity drainage pool; at this time, the third water hole is closed; In the third flow path, rainwater passes through the third water hole and is configured to be discharged outside the factory through a rainwater pump at a boosted pressure; at this time, the second water hole is closed.

2. The rainwater recycling and drainage system according to claim 1, characterized in that: The third flow path also includes a rainwater pump house front pool arranged after the intermediate diversion pool, and the rainwater pump house front pool is configured to provide a buffer space in front of the rainwater pump house.

3. The rainwater recycling and drainage system according to claim 2, characterized in that: A gate is arranged between the rainwater pump house front pool and the rainwater pump house.

4. The rainwater recycling and drainage system according to claim 1, characterized in that: In the first flow path, when the rainwater reaches the height of the first water hole, the rainwater recycling pump is turned on.

5. The rainwater recycling and drainage system according to claim 1, characterized in that: When the rainwater level is higher than the elevation of the second water hole but lower than the elevation of the third water hole, the second water hole is opened and the rainwater passes through the second flow path.

6. The rainwater recycling and drainage system according to claim 1, characterized in that: When the rainwater level is higher than the elevation of the third water hole, the third water hole is opened and the rainwater flows into the third flow path.

7. The rainwater recycling and drainage system according to claim 1, characterized in that: The opening and closing of the second water hole is performed by an electric gate.

8. The rainwater recycling and drainage system according to claim 1, characterized in that: The height of the first water hole relative to the plane of the intermediate diversion pool is H1 meters, and the height of the second water hole is (H1+0.1) meters; and / or The height of the third water hole is (H1+0.5) meters.

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