Rainwater recycling device in non-equipment area of large-scale refining and chemical production area

Abstract

This utility model discloses a rainwater harvesting device and method for non-plant areas within a large-scale refining and chemical production zone. The device includes a rainwater reuse system comprising a flotation unit, a fiber filter, an intermediate water tank, and a reuse water tank. It also includes multiple rainwater monitoring ponds, each with different effective volumes and liquid levels, used to collect initial contaminated rainwater and clean rainwater. At least one monitoring pond is connected to the rainwater reuse system. The flotation unit is connected to the rainwater reuse system and can receive water from multiple monitoring ponds for preliminary rainwater treatment. The inlet of the intermediate water tank is connected to the flotation unit, and the outlet is connected to the fiber filter. The reuse water tank is connected to the fiber filter to store the treated water. This system features successful rainwater harvesting, increased effective water sources, an annual rainwater reuse capacity of over 7 million tons, an added contaminated rainwater treatment process, and increased reuse capacity.

Description

Technical Field

[0001] This utility model relates to the field of water resource recycling technology, specifically to a rainwater recycling device in non-equipment areas of a large-scale refining and chemical production zone. Background Technology

[0002] For large-scale, isolated refining and chemical enterprises, water resources are extremely scarce. Our company's production water comes entirely from seawater desalination, employing thermal evaporation and reverse osmosis membrane separation, which is costly. Current rainwater treatment designs do not consider reuse; qualified rainwater is directly collected and discharged, while unqualified rainwater is sent to the wastewater treatment plant as emergency wastewater. Furthermore, rainwater and emergency wastewater share the same drainage channel, indirectly increasing water treatment costs. Therefore, there is an urgent need for a rainwater harvesting solution that can reduce water costs and improve water resource reuse rates. Utility Model Content

[0003] This utility model aims to reduce water costs, increase reusable water resources, realize the recycling of rainwater, seepage water and other water systems throughout the plant, improve economic efficiency, and at the same time provide a reference for effective treatment methods to explore other recyclable water resources and explore ideas to improve water efficiency.

[0004] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0005] This utility model relates to a rainwater harvesting device for non-equipment areas within a large-scale refining and chemical production zone. The rainwater reuse device includes an air flotation unit, a fiber filter, an intermediate water tank, and a reuse water tank. It also includes multiple rainwater monitoring ponds distributed within the non-equipment areas of the production zone. These monitoring ponds collect both initial contaminated rainwater and clean rainwater, and each pond has a different effective volume and liquid level. At least one monitoring pond is connected to the rainwater reuse device. The water quality indicators after treatment by the rainwater reuse device are: suspended solids <1 mg / L, COD ≤15 mg / L, oil <1 mg / L, and conductivity ≤125 μS / cm.

[0006] The dissolved air flotation (DAF) unit is connected to a rainwater recycling system. The DAF unit can receive water from multiple rainwater monitoring tanks for preliminary rainwater treatment; the flotation unit is used to remove suspended solids, oil, and other impurities from the rainwater.

[0007] The inlet of the intermediate water tank is connected to the air flotation equipment to treat rainwater and reduce the chloride ion and conductivity in the water. The outlet of the intermediate water tank is connected to the fiber filter to remove suspended solids, colloids and organic matter from the water.

[0008] The recycled water tank is connected to the fiber filter to store the recycled water treated by the fiber filter.

[0009] The air flotation equipment, fiber filter, intermediate water tank, recycled water tank, and rainwater monitoring tank are connected by pipelines for water flow transmission, and a matching water pump is connected to the pipeline.

[0010] Preferably, the water pump connected to the pipeline between the intermediate water tank and the fiber filter is an intermediate water pump, and a reclaimed water pump is connected to the pipeline at the outlet of the reclaimed water tank to realize the delivery of finished water.

[0011] Preferably, the non-equipment area within the production zone includes areas 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, and 12. Each of these areas has an independent rainwater monitoring pond (numbered 1#, 2#, 6#, 7#, 4#, 5#, 3#, 9#, and a tank area rainwater monitoring pond (numbered 1#). Areas 7 and 8 together have one rainwater monitoring pond (numbered 3#), and areas 10 and 12 together have one rainwater monitoring pond (numbered 8#). The tank area rainwater monitoring pond (numbered 1#) is connected between the recycled water storage tank and the fiber filter.

[0012] Preferably, each rainwater monitoring pool includes a pool body, an emergency water pool, an electric gate, a flat bar screen, and a rainwater lift pump. The pool body and the emergency water pool inlet are equipped with flat bar screens to enable the alternating opening and closing of the pool body and the emergency water pool. The flat bar screen outlet is equipped with an electric gate. The rainwater lift pump is located inside the pool body for external discharge. Rainwater can flow through the electric gate via open channels and culverts by its own gravity, and then flow into the pool body of each monitoring pool.

[0013] Preferably, the rainwater reuse device includes a #1 rainwater reuse device, and the #3 and #8 rainwater monitoring pools are connected to the #1 rainwater reuse device. The #1 rainwater reuse device directly receives water from the #3 and #8 rainwater monitoring pools. The #4, #5, #8 rainwater monitoring pools and the #1 tank area rainwater monitoring pool are all connected to the #3 rainwater monitoring pool via pipelines. The outlet of the #1 rainwater reuse device is connected to the #3, #4, and #5 circulating water fields via pipelines. The #3, #4, and #5 circulating water fields are all connected to the plant's public works reuse water device. The #9 rainwater monitoring pool is connected to the #8 circulating water field, which is connected to the public works reuse water device. Each circulating water field includes a tank and inlet / outlet pipelines. Polluted rainwater affected by special operating conditions is treated by the rainwater reuse device, and its indicators are better than those of the circulating water discharge. It is then sent to the public works reuse water device for further treatment along with the circulating water discharge through the circulating water field discharge line.

[0014] Preferably, the effective volume of the No. 3, No. 4, No. 5, No. 8, No. 9 rainwater monitoring ponds and the No. 1 tank area rainwater monitoring pond totals more than 130,000 cubic meters, and the maximum external transmission capacity can reach 2,100 cubic meters per hour.

[0015] Preferably, the total effective volume of each rainwater monitoring pond is 190,000 cubic meters.

[0016] Preferably, the discharge flow rate of the No. 1 rainwater reuse device is 800 cubic meters per hour.

[0017] Preferably, the fiber filter includes four independent filtration units A, B, C, and D, and the recycled water tank includes two storage units A and B. Each filtration unit and storage unit includes a tank body, and the four independent filtration units are all connected to the two storage units A and B.

[0018] This utility model discloses a method for rainwater harvesting in non-equipment areas within a large-scale refining and chemical production area. The method includes the following steps: when it rains, rainwater is collected from the ground of the entire plant and enters rainwater monitoring pools in each sub-area.

[0019] The water quality in the rainwater monitoring pond is monitored. If the water quality is qualified, the clean rainwater in the pond is discharged out through the overflow weir (discharged to the Suitang River in extreme weather, and discharged to the sea in other cases). If the water quality is unqualified, the rainwater lift pump in the pond is started to lift the unqualified rainwater to the corresponding rainwater reuse device for treatment. After the rainwater in the rainwater monitoring pond is sent to the corresponding rainwater reuse device, it is first treated by the air flotation equipment to remove suspended solids and oil in the rainwater. Then it passes through the intermediate water tank to reduce the chloride ions and conductivity in the water. Then it passes through the fiber filter for further treatment to remove suspended solids, colloids and organic matter in the water. Then it is sent to the reuse water tank and finally replenished to each circulating water field.

[0020] Beneficial effects: Successfully recovering rainwater increases effective water sources, with more than 7 million tons of rainwater reusable annually. It also adds a process for treating polluted rainwater, increasing the amount of water reused. Attached Figure Description

[0021] Figure 1 This is a layout diagram of the entire plant's rainwater monitoring tanks for this utility model.

[0022] Figure 2 This is a flowchart of the rainwater reuse modification of this utility model.

[0023] Figure 3 This is a flow chart of the No. 1 rainwater recycling device of this utility model. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] 1. Rainwater harvesting system

[0027] Rainwater monitoring ponds are distributed in the non-equipment areas within the production area, with a total effective volume of 190,000 cubic meters. Each pond has different volumes and liquid levels depending on the area it covers, and is responsible for collecting initial contaminated rainwater and clean rainwater. The rainwater monitoring ponds include the pond body, electric gates, flat bar screens, rainwater lift pumps, etc. Water from open and culverts flows in by gravity.

[0028] Rainwater Reuse System: A rainwater reuse unit (No. 1) is installed next to rainwater monitoring tank No. 3, which can directly receive water from rainwater monitoring tanks No. 3 and No. 8. A flow path from rainwater monitoring tanks No. 4, No. 5, No. 8, and tank area No. 1 to rainwater monitoring tank No. 3 is also added. To improve the reuse rate, rainwater reuse unit No. 1 and a flow path from rainwater monitoring tank No. 9 to the public works water reuse system are added. The design capacity of rainwater reuse unit No. 1 is 800 cubic meters per hour.

[0029] Treatment equipment: The No. 1 rainwater harvesting device treats rainwater through an air flotation device, an intermediate water tank, and a fiber filter (including multiple filter units A, B, C, and D) to remove oil, impurities, and reduce chloride ions and conductivity. The fiber filter receives the water treated in the intermediate water tank and sends it to the recycled water tank (including two storage units A and B) for storage. The water pump drives the water flow and sends it to each circulating water field.

[0030] 2. Rainwater harvesting methods

[0031] During rainfall, rainwater collected from the ground throughout the plant is channeled into rainwater monitoring pools in various zones via a rainwater system.

[0032] The water quality in the rainwater monitoring pond is monitored. If the water quality is qualified, the clean rainwater in the pond is discharged out through the overflow weir (discharged to the Suitang River in extreme weather, and discharged to the sea in other cases). If the water quality is unqualified, the rainwater lift pump in the pond is started to lift the unqualified rainwater to the corresponding rainwater reuse device for treatment. After the rainwater in the rainwater monitoring pond is sent to the corresponding rainwater reuse device, it is first treated by the air flotation equipment to remove suspended solids and oil in the rainwater. Then it passes through the intermediate water tank to reduce the chloride ions and conductivity in the water. Then it passes through the fiber filter for further treatment to remove suspended solids, colloids and organic matter in the water. Then it is sent to the reuse water tank and finally replenished to each circulating water field.

[0033] Polluted rainwater affected by special operating conditions is treated by the No. 1 rainwater reuse device and then sent to the public works reuse water device for further treatment along with the circulating water discharge line. The treated water is better than the circulating water discharge indicators and will not impact the public works reuse water device.

[0034] (I) Setup of the equipment

[0035] Construct a rainwater monitoring pond according to design requirements, and equip it with appropriate pond bodies, electric gates, flat bar screens, rainwater lift pumps, and other facilities, setting suitable volume and liquid level according to regional characteristics. Install rainwater reuse device #1, connecting it to the air flotation equipment, fiber filter, intermediate water tank, reuse water tank, and related pumps and pipelines, ensuring correct equipment connections and stable operation.

[0036] (II) Rainwater Harvesting Operation

[0037] 1. During rainfall, rainwater is collected on the ground and enters the rainwater system, flowing into the rainwater monitoring pools in each sub-area.

[0038] 2. Real-time monitoring of water quality in the rainwater monitoring tank using water quality monitoring equipment:

[0039] If the water quality meets the requirements, such as suspended solids <50-150mg / L, COD≤40mg / L, oil <5mg / L, and conductivity≤400μS / cm (refer to Table 2 for specific indicators), clean rainwater will be discharged to the sea through the overflow weir under non-extreme weather conditions; during extreme weather such as typhoons and thunderstorms, the rainwater monitoring pool will be discharged as soon as it is full.

[0040] Table 2 Comparison of Water Quality Indicators

[0041]

[0042] 3. Rainwater from some rainwater monitoring tanks (such as tanks #3, #4, #5, #8, and #1) is sent to the #1 rainwater reuse device:

[0043] First, the water enters the air flotation equipment to remove most of the suspended solids, oil, and other impurities from the rainwater.

[0044] The water then flows into an intermediate pool and a fiber filter, where chloride ions and conductivity are further reduced, ensuring that the treated water meets the following standards: suspended solids <1 mg / L, COD ≤15 mg / L, oil <1 mg / L, and conductivity ≤125 μS / cm (meeting the effluent standards of the rainwater reuse device in Table 2). Finally, the treated water is pumped back to the circulating water system.

[0045] 4. Polluted rainwater affected by special operating conditions, after being treated by the No. 1 rainwater reuse unit, is sent to the public works reuse water unit for further treatment along with the circulating water discharge line. The polluted rainwater indicators after treatment are better than those of the circulating water discharge (refer to Table 3), and will not impact the public works reuse water unit.

[0046] Table 3 Comparison of water quality indicators after treated polluted rainwater

[0047]

[0048] The above-mentioned devices and methods enable the effective recycling and utilization of rainwater in non-plant areas within large-scale refining and chemical production zones, thereby reducing water costs and improving water resource utilization.

[0049] like Figure 1-3The illustration shows a specific embodiment of a rainwater harvesting device in a non-plant area of ​​a large-scale refining and chemical production zone. This rainwater harvesting device includes a rainwater reuse unit, which comprises an air flotation unit, a fiber filter, an intermediate water tank, and a reuse water tank. It also includes multiple rainwater monitoring ponds distributed throughout the non-plant area of ​​the production zone. These monitoring ponds collect both initial contaminated rainwater and clean rainwater, and each pond has a different effective volume and liquid level. At least one monitoring pond is connected to the rainwater reuse unit. The water quality indicators after treatment by the rainwater reuse unit are: suspended solids < 1 mg / L, COD ≤ 15 mg / L, oil < 1 mg / L, and conductivity ≤ 125 μS / cm.

[0050] The dissolved air flotation (DAF) unit is connected to a rainwater recycling system. The DAF unit can receive water from multiple rainwater monitoring tanks for preliminary rainwater treatment; the flotation unit is used to remove suspended solids, oil, and other impurities from the rainwater.

[0051] The inlet of the intermediate water tank is connected to the air flotation equipment to treat rainwater and reduce the chloride ion and conductivity in the water. The outlet of the intermediate water tank is connected to the fiber filter to remove suspended solids, colloids and organic matter from the water.

[0052] The recycled water tank is connected to the fiber filter to store the recycled water treated by the fiber filter.

[0053] The air flotation equipment, fiber filter, intermediate water tank, recycled water tank, and rainwater monitoring tank are connected by pipelines for water flow transmission, and a matching water pump is connected to the pipeline.

[0054] Preferably, the water pump connected to the pipeline between the intermediate water tank and the fiber filter is an intermediate water pump, and a reclaimed water pump is connected to the pipeline at the outlet of the reclaimed water tank to realize the delivery of finished water.

[0055] Preferably, the non-equipment area within the production zone includes areas 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, and 12. Each of these areas has an independent rainwater monitoring pond (numbered 1#, 2#, 6#, 7#, 4#, 5#, 3#, 9#, and a tank area rainwater monitoring pond (numbered 1#). Areas 7 and 8 together have one rainwater monitoring pond (numbered 3#), and areas 10 and 12 together have one rainwater monitoring pond (numbered 8#). The tank area rainwater monitoring pond (numbered 1#) is connected between the recycled water storage tank and the fiber filter.

[0056] Preferably, each rainwater monitoring pool includes a pool body, an emergency water pool, an electric gate, a flat bar screen, and a rainwater lift pump. The pool body and the emergency water pool inlet are equipped with flat bar screens to enable the alternating opening and closing of the pool body and the emergency water pool. The flat bar screen outlet is equipped with an electric gate. The rainwater lift pump is located inside the pool body for external discharge. Rainwater can flow through the electric gate via open channels and culverts by its own gravity, and then flow into the pool body of each monitoring pool.

[0057] Preferably, the rainwater reuse device includes a #1 rainwater reuse device, and the #3 and #8 rainwater monitoring pools are connected to the #1 rainwater reuse device. The #1 rainwater reuse device directly receives water from the #3 and #8 rainwater monitoring pools. The #4, #5, #8 rainwater monitoring pools and the #1 tank area rainwater monitoring pool are all connected to the #3 rainwater monitoring pool via pipelines. The outlet of the #1 rainwater reuse device is connected to the #3, #4, and #5 circulating water fields via pipelines. The #3, #4, and #5 circulating water fields are all connected to the plant's public works reuse water device. The #9 rainwater monitoring pool is connected to the #8 circulating water field, which is connected to the public works reuse water device. Each circulating water field includes a tank and inlet / outlet pipelines. Polluted rainwater affected by special operating conditions is treated by the rainwater reuse device, and its indicators are better than those of the circulating water discharge. It is then sent to the public works reuse water device for further treatment along with the circulating water discharge through the circulating water field discharge line.

[0058] Table 1 Parameters of Reusable Rainwater Monitoring Pond

[0059]

[0060] In a preferred embodiment, the total effective volume of the No. 3, No. 4, No. 5, No. 8, and No. 9 rainwater monitoring ponds, along with the No. 1 tank area rainwater monitoring pond, exceeds 130,000 cubic meters, with a maximum external discharge capacity of 2,100 cubic meters per hour. The total effective volume of all rainwater monitoring ponds is 190,000 cubic meters. The external discharge flow rate of the No. 1 rainwater reuse device is 800 cubic meters per hour.

[0061] A preferred embodiment, such as Figure 2 As shown, the fiber filter includes four independent filtration units: A, B, C, and D. The recycled water tank includes two storage units: A and B. Each filtration unit and storage unit includes a tank body. All four independent filtration units are connected to the two storage units A and B.

[0062] This utility model discloses a method for rainwater harvesting in non-equipment areas within a large-scale refining and chemical production area. The method includes the following steps: when it rains, rainwater is collected from the ground of the entire plant and enters rainwater monitoring pools in each sub-area.

[0063] The water quality in the rainwater monitoring pond is monitored. If the water quality is qualified, the clean rainwater in the pond is discharged out through the overflow weir (discharged to the Suitang River in extreme weather, and discharged to the sea in other cases). If the water quality is unqualified, the rainwater lift pump in the pond is started to lift the unqualified rainwater to the corresponding rainwater reuse device for treatment. After the rainwater in the rainwater monitoring pond is sent to the corresponding rainwater reuse device, it is first treated by the air flotation equipment to remove suspended solids and oil in the rainwater. Then it passes through the intermediate water tank to reduce the chloride ions and conductivity in the water. Then it passes through the fiber filter for further treatment to remove suspended solids, colloids and organic matter in the water. Then it is sent to the reuse water tank and finally replenished to each circulating water field.

[0064] Finally, it should be noted that this utility model is not limited to the above embodiments, and many variations are possible. All variations that can be directly derived or conceived by those skilled in the art from the disclosure of this utility model should be considered within the protection scope of this utility model.

Claims

1. A rainwater recovery device in a non-equipment area in a large refinery production area, characterized in that: It includes a rainwater reuse device, which includes an air flotation device, a fiber filter, an intermediate water tank, and a reuse water tank. It also includes multiple rainwater monitoring pools, which are distributed in the non-device area within the production area. These pools are used to collect initial contaminated rainwater and clean rainwater, and each rainwater monitoring pool has a different effective volume and liquid level. At least one rainwater monitoring pool is connected to the rainwater reuse device. The air flotation equipment is connected to the rainwater reuse device, and the air flotation equipment can receive water from multiple rainwater monitoring tanks for preliminary treatment of rainwater; The inlet of the intermediate water tank is connected to the air flotation equipment to treat rainwater and reduce the chloride ion and conductivity in the water. The outlet of the intermediate water tank is connected to the fiber filter to remove suspended solids, colloids and organic matter from the water. The recycled water tank is connected to the fiber filter to store the recycled water treated by the fiber filter. The air flotation equipment, fiber filter, intermediate water tank, recycled water tank, and rainwater monitoring tank are connected by pipelines for water flow transmission, and a matching water pump is connected to the pipeline.

2. The rainwater recovery system in non-equipment area in large refinery and petrochemical production area of claim 1, wherein: The water pump connected to the pipeline between the intermediate water tank and the fiber filter is an intermediate water pump, and the pipeline at the outlet of the recycled water tank is connected to a recycled water pump to enable the delivery of finished water.

3. The rainwater recycling device in non-equipment area of large refinery production area according to claim 1 or 2, characterized in that: The non-equipment area within the production zone includes areas 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, and 12. Each of these areas has its own independent rainwater monitoring pond (numbered 1#, 2#, 6#, 7#, 4#, 5#, 3#, 9#, and a tank area rainwater monitoring pond (numbered 1#). Areas 7 and 8 together have one rainwater monitoring pond (numbered 3#), and areas 10 and 12 together have one rainwater monitoring pond (numbered 8#). The tank area rainwater monitoring pond (numbered 1#) is connected between the recycled water storage tank and the fiber filter.

4. The rainwater recovery device in non-equipment area in large refining and chemical production area of claim 3, characterized in that, Each rainwater monitoring pool includes a pool body, an emergency water pool, an electric gate, a flat bar screen, and a rainwater lift pump. The pool body and the emergency water pool inlet are equipped with flat bar screens to allow for the alternating opening and closing of the pool body and the emergency water pool. The flat bar screen outlet is equipped with an electric gate. The rainwater lift pump is located inside the pool body for external discharge. Rainwater can flow through the electric gate through open channels and culverts by its own gravity, and then flow into the pool body of each monitoring pool.

5. The rainwater recovery device in non-equipment area in large-scale refining and chemical production area according to claim 4, characterized in that, The rainwater reuse system includes a No. 1 rainwater reuse device. Rainwater monitoring ponds No. 3 and No. 8 are connected to the No. 1 rainwater reuse device. The No. 1 rainwater reuse device directly receives water from rainwater monitoring ponds No. 3 and No.

8. Rainwater monitoring ponds No. 4, No. 5, No. 8, and the No. 1 tank area rainwater monitoring pond are all connected to rainwater monitoring pond No. 3 via pipelines. The outlet of the No. 1 rainwater reuse device is connected to circulating water fields No. 3, No. 4, and No. 5 via pipelines. Circulating water fields No. 3, No. 4, and No. 5 are all connected to the plant's public works reuse water system. Rainwater monitoring pond No. 9 is connected to circulating water field No. 8, which is connected to the public works reuse water system. Each circulating water field includes a tank and inlet / outlet pipelines.

6. The rainwater recovery system in non-equipment area in large refinery and petrochemical production area of claim 3, wherein, The total effective volume of the No. 3, No. 4, No. 5, No. 8, No. 9 rainwater monitoring ponds and the No. 1 tank area rainwater monitoring pond is over 130,000 cubic meters, and the maximum external transmission capacity can reach 2,100 cubic meters per hour.

7. The rainwater recovery device in non-equipment area in large-scale refining and chemical production area according to claim 3 or 6, characterized in that, The total effective volume of all rainwater monitoring ponds is 190,000 cubic meters.

8. The rainwater recovery system in non-equipment area in large refinery and petrochemical production zone according to claim 5, characterized in that, The discharge flow rate of the No. 1 rainwater reuse device is 800 cubic meters per hour.

9. The rainwater recovery system in non-equipment area in large scale refinery and petrochemical production zone of claim 1, wherein, The fiber filter includes four independent filtration units: A, B, C, and D. The recycled water tank includes two storage units: A and B. Each filtration unit and storage unit includes a tank body. All four independent filtration units are connected to the two storage units A and B.

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