Working method and system of initial rainwater collection system based on drainage partition of power plant

Abstract

The invention belongs to the technical field of rainwater collection, and provides a working method and system of an initial rainwater collection system based on a drainage partition of a power plant, in rainy days, rainwater in a first area is directly discharged into a municipal drainage system through a channel, initial rainwater in a second area is firstly discharged into an initial rainwater collection pool, and after the initial rainwater collection pool is full, the rainwater in the second area is discharged into the municipal drainage system. Rainwater is drained into a municipal drainage system; in non-rainy days, the ground flushing wastewater during operation in the second area is discharged into an initial rainwater collection pool and pumped into a wastewater treatment system through pressurization of a pump; only the initial rainwater in the second area generating dirty water is drained into the initial rainwater collection pool, the initial rainwater in the first area is directly drained into a municipal drainage system, the collection amount of the initial rainwater is reduced, meanwhile, the initial rainwater collection pool can collect flushing wastewater in the second area, and the collection efficiency is improved. The rainwater collection pool also serves as a second area wastewater collection pool and an initial rainwater collection pool, the number and occupied area of the collection pools are reduced, and the complexity and cost of the system are reduced.

Description

Technical Field

[0001] This invention belongs to the field of rainwater harvesting technology, and particularly relates to a working method and system for an initial rainwater harvesting system based on power plant drainage zones. Background Technology

[0002] Ensuring smooth and clean rainwater drainage is crucial for the safe operation and environmental compliance of power plants. Some areas of the power plant are relatively clean, allowing rainwater to be directly discharged into the municipal stormwater system. However, some areas generate dirty water during operation, requiring separate wastewater collection ponds for treatment according to environmental regulations. In some areas, environmental requirements also mandate the collection of initial rainwater runoff from these dirty areas for the first few minutes before it is discharged into the municipal stormwater system.

[0003] Collecting the initial rainwater from the entire power plant involves a large volume of water and requires a large area for the collection ponds. In addition, the dirty water flushed during operation in some areas requires a separate dirty water collection pond, which increases the number of collection ponds and the area occupied by them in the plant area, thus increasing costs. Summary of the Invention

[0004] To address the aforementioned problems, this invention proposes a working method and system for an initial rainwater collection system based on power plant drainage zoning. This invention only discharges initial rainwater from the second zone (where wastewater is generated) into an initial rainwater collection tank, while initial rainwater from the first zone is directly discharged into the municipal drainage system. This reduces the amount of initial rainwater collected and lowers the required area for the collection tank. Simultaneously, the initial rainwater collection tank can also collect flushing wastewater from the second zone. The rainwater collection tank functions as both a wastewater collection tank for the second zone (the dirty zone) and an initial rainwater collection tank, reducing the number of collection tanks and the required area, thus lowering system complexity and cost.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution: In a first aspect, the present invention provides a method for operating an initial rainwater collection system based on a power plant drainage zone. The initial rainwater collection system includes an interconnected filter tank and an initial rainwater collection tank. The filter tank is equipped with an inlet pipe connected to a channel in a pre-defined second zone, and a pre-buried pipe connected to a municipal drainage system. The initial rainwater collection tank is connected to a wastewater treatment system via pipes and a pump. The operating method includes: The power plant is divided into a first zone and a second zone according to the cleanliness level, and ditches are set up in the first zone and the second zone respectively. During rainy days, rainwater from the first zone is directly discharged into the municipal drainage system through the ditches. The initial rainwater from the second zone first enters the filtration pond through the ditches and then is discharged into the initial rainwater collection pond. After the initial rainwater collection pond is full, the subsequent rainwater is discharged into the municipal drainage system through pre-buried pipes. During non-rainy days, the surface washing wastewater from the operation of the second zone enters the filtration pond through the ditches and is discharged into the initial rainwater collection pond. It is then pressurized by pumps and pumped into the wastewater treatment system for treatment and reuse.

[0006] Furthermore, the first area includes at least one or more of the following: the plant front area, the transformer and GIS area, the turbine hall area, the boiler and desulfurization area, and the circulating pump and drainage pump room area; the second area includes at least one or more of the following: the ash storage area and the limestone shed area.

[0007] Secondly, the present invention also provides an initial rainwater collection system based on the drainage zone of a power plant, including a filter pool and an initial rainwater collection pool that are interconnected; the filter pool is provided with an inlet pipe connected to a ditch in a preset second area, and a pre-buried pipe connected to the municipal drainage system; the initial rainwater collection pool is connected to a wastewater treatment system through a coal-containing wastewater connection pipe and a pump in the plant area. The power plant is divided into a first zone and a second zone according to the cleanliness level, and ditches are set up in the first zone and the second zone respectively. During rainy days, rainwater from the first zone is directly discharged into the municipal drainage system through the ditches. The initial rainwater from the second zone first enters the filtration pond through the ditches and then is discharged into the initial rainwater collection pond. After the initial rainwater collection pond is full, the subsequent rainwater is discharged into the municipal drainage system through pre-buried pipes. During non-rainy days, the surface washing wastewater from the operation of the second zone enters the filtration pond through the ditches and is discharged into the initial rainwater collection pond. It is then pressurized by pumps and pumped into the wastewater treatment system for treatment and reuse.

[0008] Furthermore, the first area includes at least one or more of the following: the plant front area, the transformer and GIS area, the turbine hall area, the boiler and desulfurization area, and the circulating pump and drainage pump room area; the second area includes at least one or more of the following: the ash storage area and the limestone shed area.

[0009] Furthermore, a water filter grid is inclinedly arranged inside the filter pool.

[0010] Furthermore, a water collection pit is set up in the initial rainwater collection pool; the water collection pit is connected to the wastewater treatment system through a coal-containing wastewater connection pipe and a pump in the plant area.

[0011] Furthermore, the coal-containing wastewater connection pipe in the plant area is equipped with a first slope and a second slope; the first slope and the second slope are located on both sides of the water collection pit.

[0012] Furthermore, the water collection pit is equipped with a third slope and a fourth slope.

[0013] Furthermore, a valve well is provided at the water collection pit, and the coal-containing wastewater connection pipe of the plant area passes through the valve well; ladders are provided at the filter pool, the initial rainwater collection pool and the water collection pit.

[0014] Furthermore, the top elevation of the channel in the second region is flush with the top elevation of the filter tank.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: In this invention, the power plant is divided into a first zone and a second zone according to the cleanliness level, and ditches are set up in the first zone and the second zone respectively. During rainy days, rainwater from the first zone is directly discharged into the municipal drainage system through the ditches, while the initial rainwater from the second zone first enters the filtration pond through the ditches and then is discharged into the initial rainwater collection pond. After the initial rainwater collection pond is full, subsequent rainwater is discharged into the municipal drainage system through pre-buried pipes. During non-rainy days, the surface washing wastewater from the second zone during operation enters the filtration pond through the ditches and is then discharged into the initial rainwater collection pond. It is then pressurized by a pump and pumped into the wastewater treatment system for treatment and reuse. Only the initial rainwater from the second zone that generates dirty water is discharged into the initial rainwater collection pond, while the initial rainwater from the first zone is directly discharged into the municipal drainage system. This reduces the amount of initial rainwater collected and lowers the area required for the collection pond. At the same time, the initial rainwater collection pond can also collect the washing wastewater from the second zone. The rainwater collection pond serves as both the wastewater collection pond for the second zone (dirty zone) and the initial rainwater collection pond, reducing the number of collection ponds and the area occupied, and lowering the system complexity and cost.

[0016] This invention rationally divides the factory area into clean and dirty rainwater zones based on the functions of each building and structure, with clear functions and convenient operation. The initial rainwater collection tank also functions as a wastewater collection tank for the dirty zone and an initial rainwater collection tank, which reduces the complexity of the system to a certain extent, ensures convenient operation, and reduces initial investment. The initial rainwater collection system is divided into two parts: wastewater and initial rainwater are filtered through the collection pit before entering the factory wastewater system for treatment. Attached Figure Description

[0017] The accompanying drawings, which form part of this embodiment, are used to provide a further understanding of this embodiment. The illustrative embodiments and their descriptions are used to explain this embodiment and do not constitute an improper limitation of this embodiment.

[0018] Figure 1 This is a schematic diagram of the power plant zoning in Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the collection pool structure in Embodiment 1 of the present invention; Figure 3This is a side cross-sectional view of the collection pool in Embodiment 1 of the present invention; Figure 4 This is a cross-sectional view of the water collection pit in Embodiment 1 of the present invention; The components include: 1. Filter tank; 101. Inlet pipe; 102. Embedded pipe; 103. Filter screen; 2. Initial rainwater collection tank; 201. First slope; 202. Second slope; 3. Sump; 301. Connection pipe for coal-containing wastewater in the plant area; 302. Pump; 303. Valve well; 304. Cover plate; 305. Third slope; 306. Fourth slope; 4. Guardrail; 5. Ladder. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0021] Example 1: Ensuring smooth and clean rainwater drainage is crucial for the safe operation and environmental compliance of power plants. Some areas of the power plant, such as the plant front area, turbine hall, and boiler room, are relatively clean, and their rainwater can be directly discharged into the municipal stormwater system. However, some production areas, such as ash storage areas and limestone slag sheds, generate dirty water during operation. In accordance with environmental regulations, this rainwater requires separate treatment in wastewater collection ponds. In some areas, environmental regulations also require the initial collection of rainwater for the first few minutes before subsequent rainwater is discharged into the municipal stormwater system.

[0022] As described in the background section, collecting the initial rainwater of the entire power plant as a whole involves a large volume of water, requiring a large area for the collection ponds. Furthermore, the dirty water flushed during operation in some areas requires separate dirty water collection ponds, which increases the number of collection ponds and the area occupied by the plant, thus increasing costs.

[0023] To address the aforementioned issues, this embodiment provides an initial rainwater collection system based on power plant drainage zoning, dividing the power plant's rainwater into clean and dirty zones to ensure that the power plant's drainage meets environmental standards. It also proposes a collection pit for rainwater sedimentation and an initial rainwater collection pond that serves as both a rainwater collection pool for the dirty zone during rainy days and a collection pool for ground flushing wastewater during non-rainy days. This reduces the initial investment in the power plant to some extent and facilitates on-site operation and maintenance.

[0024] like Figure 1As shown, the power plant is divided into a first area and a second area according to the degree of cleanliness, which are respectively designated as a clean area and a dirty area. Ditches are set up in the first area and the second area respectively. Optionally, the first area includes the front area of ​​the plant, the transformer and GIS area, the turbine hall area, the boiler and desulfurization area, the circulating pump and drainage pump room area and / or other clean areas; the second area includes the ash storage area, the limestone shed area and / or other areas that may generate dirty water.

[0025] like Figure 2 , Figure 3 and Figure 4 As shown, the initial rainwater harvesting system includes a filter pool 1 and an initial rainwater harvesting pool 2 that are interconnected, a collection pit 3 set in the initial rainwater harvesting pool 2, protective railings 4 set around the filter pool 1, the initial rainwater harvesting pool 2 and the collection pit 3, and ladders 5 set in the filter pool 1, the initial rainwater harvesting pool 2 and the collection pit 3 respectively.

[0026] The filter pool 1 is provided with an inlet pipe 101 connected to the channel in the preset second area, a pre-buried pipe 102 connected to the municipal drainage system, and a filter grid inclinedly installed in the filter pool.

[0027] The initial rainwater collection tank 2 is provided with a first slope 201 and a second slope 202; the first slope 201 and the second slope 202 are located on both sides of the collection pit 3, and the lower end of the first slope 201 and the second slope 202 is close to the collection pit 3, so that the initial rainwater or flushing wastewater can flow to the collection pit 3.

[0028] The sump pit 3 is equipped with a coal-containing wastewater connection pipe 301, and a pump 302 is installed on the coal-containing wastewater connection pipe 301. A valve well 303 is installed on the sump pit 3. The coal-containing wastewater connection pipe 301 passes through the valve well 303, and a cover plate 304 is installed on the valve well 303. The sump pit 3 is equipped with a third slope 305 and a fourth slope 306 to facilitate sedimentation and pumping operations of the coal-containing wastewater connection pipe 301.

[0029] Ladders 4 are provided at the filter pool 1, the initial rainwater collection pool 2, and the water collection pit.

[0030] The initial rainwater collection tank 2 is connected to the wastewater treatment system via a coal-containing wastewater connection pipe 301 and a pump 302. Specifically, a water collection pit 3 is set up in the initial rainwater collection tank 2. The water collection pit 3 is connected to the wastewater treatment system via a coal-containing wastewater connection pipe 301 and a pump 302.

[0031] One working method or principle of this embodiment is as follows: On rainy days, rainwater from the first area is directly introduced into the drainage pumping station through rainwater pipes or ditches and then discharged into the municipal drainage system. The initial rainwater from the second area first enters the filter tank 1 through the ditch and then is discharged into the initial rainwater collection tank 2. After the initial rainwater collection tank 2 is full, subsequent rainwater is discharged into the municipal drainage system through the pre-buried pipe 102. On non-rainy days, the ground washing wastewater from the operation of the second area enters the filter tank 1 through the ditch and is discharged into the initial rainwater collection tank 2. It is then pressurized by pump 302 and pumped into the wastewater treatment system for treatment and reuse, which can reduce the setting of a dirty area wastewater collection tank. The initial rainwater collection tank 2 also functions as a dirty area wastewater collection tank and an initial rainwater collection tank.

[0032] To ensure aesthetics, reduce the number of rainwater drainage structures within the factory area, decrease maintenance workload, and lower initial investment, the factory area is rationally divided into clean and dirty zones. An initial rainwater collection pond is installed, serving the purpose of collecting initial rainwater during rainy days and surface washing water from dirty areas on non-rainy days. Specifically: A drainage ditch is installed in the dirty area to collect wastewater generated during operation (such as dusty wash water from the ground) on non-rainy days, and to collect rainwater from this area to a rainwater collection tank on rainy days. The initial rainwater collection system is divided into two parts: a filtration tank 1 and an initial rainwater collection tank 2. The ditch in the dirty area is connected to the filtration tank 1, and the top elevation of the ditch is level with the top elevation of the filtration tank 1 to ensure that water can flow smoothly from the ditch into the filtration tank. The filtration tank 1 is equipped with a filter screen 103 to ensure that large objects in the water flowing into the filtration tank are filtered through the screen before entering the plant's wastewater system. The filter screen 103 is placed at an angle to increase the flow surface and reduce the impact of water on the screen. A pre-buried pipe 102 is installed in the filtration tank 1 to connect to the plant's rainwater pipes, ensuring that clean rainwater collected in the initial rainwater stage can be smoothly discharged into the plant's rainwater system; the elevation of the pre-buried pipe 102 is the same as the elevation of the drainage ditch. A collection pit 3 is installed in the initial rainwater collection tank 2 to ensure drainage from the dirty area on non-rainy days. After sufficient sedimentation, the water flows into the collection pit 3 and is then pumped by pump 302 to the plant's wastewater system for treatment and reuse. Pump start-up and stop levels are set to avoid repeated start-ups and shutdowns. Both the collection pit 3 and the initial rainwater collection tank 2 are sloped towards the collection pit; both are equipped with ladders for maintenance. The volume of the collection pit 3 and the initial rainwater collection tank 2 can be determined based on local rainfall and the required initial rainwater collection time according to environmental regulations.

[0033] In other embodiments, the factory area rainwater system and rainwater collection pond can be reasonably set up to ensure the aesthetics of the factory area and reduce the workload of operation.

[0034] Example 2: This embodiment provides a working method for an initial rainwater collection system based on power plant drainage zones. It uses the initial rainwater collection system based on power plant drainage zones from Embodiment 1. The initial rainwater collection system includes a filter tank 1 and an initial rainwater collection tank 2 that are interconnected. The filter tank 1 is equipped with an inlet pipe 101 connected to a channel in a pre-defined second area, and a pre-buried pipe 102 connected to the municipal drainage system. The initial rainwater collection tank 102 is connected to a wastewater treatment system via a pipe and a pump 302. The working method includes: The power plant is divided into a first zone and a second zone according to the cleanliness level, and ditches are set up in the first zone and the second zone respectively. During rainy days, rainwater from the first zone is directly discharged into the municipal drainage system through the ditches. The initial rainwater from the second zone first enters the filter pool 1 through the ditches and then is discharged into the initial rainwater collection pool 2. After the initial rainwater collection pool 2 is full, the subsequent rainwater is discharged into the municipal drainage system through the pre-buried pipe 102. During non-rainy days, the surface washing wastewater from the operation of the second zone enters the filter pool 1 through the ditches and is discharged into the initial rainwater collection pool 2. It is then pressurized by pump 302 and pumped into the wastewater treatment system for treatment and reuse.

[0035] The above description is merely a preferred embodiment of this practice and is not intended to limit the scope of this practice. Various modifications and variations can be made to this practice by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this practice should be included within the protection scope of this practice.

Claims

1. A method for operating an initial rainwater harvesting system based on power plant drainage zones, characterized in that, An initial rainwater harvesting system was used, which included an interconnected filter tank and an initial rainwater collection tank. The filter tank was equipped with an inlet pipe connected to a ditch in a pre-designated second area, as well as a pre-buried pipe connected to the municipal drainage system. The initial rainwater collection tank was connected to a wastewater treatment system via pipes and pumps. The working method includes: The power plant is divided into a first zone and a second zone according to its cleanliness level, and trenches are set up in the first zone and the second zone respectively. During rainy days, rainwater from the first area is directly discharged into the municipal drainage system through ditches. Initial rainwater from the second area first enters the filtration tank through ditches and then flows into the initial rainwater collection tank. Once the initial rainwater collection tank is full, subsequent rainwater is discharged into the municipal drainage system through pre-buried pipes. During non-rainy days, wastewater from surface washing during operation in the second area enters the filtration tank through ditches and then flows into the initial rainwater collection tank. It is then pressurized by pumps and pumped into the wastewater treatment system for treatment and reuse.

2. The working method of the initial rainwater harvesting system based on power plant drainage zoning as described in claim 1, characterized in that, The first area includes at least one or more of the following areas: the plant front area, the transformer and GIS area, the turbine hall area, the boiler and desulfurization area, and the circulating pump and drainage pump room area; the second area includes at least one or more of the following areas: the ash storage area and the limestone shed area.

3. An initial rainwater harvesting system based on power plant drainage zoning, characterized in that, It includes interconnected filter tanks and initial rainwater collection tanks; the filter tanks are equipped with inlet pipes connected to the channels in the pre-set second area, as well as pre-buried pipes connected to the municipal drainage system; the initial rainwater collection tanks are connected to the wastewater treatment system through coal-containing wastewater connection pipes and pumps in the factory area. The power plant is divided into a first zone and a second zone according to the cleanliness level, and ditches are set up in the first zone and the second zone respectively. During rainy days, rainwater from the first zone is directly discharged into the municipal drainage system through the ditches. The initial rainwater from the second zone first enters the filtration pond through the ditches and then is discharged into the initial rainwater collection pond. After the initial rainwater collection pond is full, the subsequent rainwater is discharged into the municipal drainage system through pre-buried pipes. During non-rainy days, the surface washing wastewater from the operation of the second zone enters the filtration pond through the ditches and is discharged into the initial rainwater collection pond. It is then pressurized by pumps and pumped into the wastewater treatment system for treatment and reuse.

4. The initial rainwater harvesting system based on power plant drainage zoning as described in claim 3, characterized in that, The first area includes at least one or more of the following areas: the plant front area, the transformer and GIS area, the turbine hall area, the boiler and desulfurization area, and the circulating pump and drainage pump room area; the second area includes at least one or more of the following areas: the ash storage area and the limestone shed area.

5. The initial rainwater harvesting system based on power plant drainage zones as described in claim 3, characterized in that, The filter pool is equipped with a water filter grid at an angle.

6. The initial rainwater harvesting system based on power plant drainage zoning as described in claim 3, characterized in that, The initial rainwater collection pool is equipped with a water collection pit; the water collection pit is connected to the wastewater treatment system through a coal-containing wastewater connection pipe and a pump in the plant area.

7. The initial rainwater harvesting system based on power plant drainage zones as described in claim 6, characterized in that, The coal-containing wastewater connection pipe in the plant area is equipped with a first slope and a second slope; the first slope and the second slope are located on both sides of the water collection pit.

8. The initial rainwater harvesting system based on power plant drainage zoning as described in claim 6, characterized in that, The water collection pit is equipped with a third slope and a fourth slope.

9. The initial rainwater harvesting system based on power plant drainage zoning as described in claim 6, characterized in that, A valve well is installed at the water collection pit, and the coal-containing wastewater connection pipe of the plant area passes through the valve well; ladders are installed at the filter pool, the initial rainwater collection pool and the water collection pit.

10. The initial rainwater harvesting system based on power plant drainage zoning as described in claim 6, characterized in that, The top elevation of the channel in the second region is level with the top elevation of the filter tank.

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