Emergency accident pool integrated with oil separation function and method for separating oil pollutants by using emergency accident pool

Abstract

The invention discloses an emergency accident pool integrated with an oil separation function and an oil pollutant separation method thereof.The emergency accident pool comprises an emergency accident pool body, a water inlet pipe is arranged on the side wall of one side of the emergency accident pool body in the length direction, and an emptying pipe is arranged on the side wall of the other side of the emergency accident pool body; the emptying pipe is communicated with the outlet end of a delivery pump arranged in the emergency accident pool body; a flow guide wall is arranged in the emergency accident pool body in the width direction, the flow guide wall is arranged on one side close to the emptying pipe, and the emergency accident pool body is divided into a separation area and a lifting area by the flow guide wall; a rectification hole is formed in the lower part of the flow guide wall; the separation area is communicated with the lifting area through the rectification hole; the delivery pump is arranged in the lifting area, and the water inlet pipe is positioned on the side wall of the separation area. The emergency accident pool integrated with the oil separation function solves the technical problem that oil pollutants in accident water cannot be effectively separated in the prior art.

Description

Technical Field

[0001] The invention belongs to the technical field of emergency facilities, and in particular relates to an emergency accident pool with integrated oil separation function and a method for separating oil pollutants therefrom. Background Art

[0002] As an important emergency facility, the emergency accident pool can quickly and effectively handle and dispose of leaks in an emergency to prevent them from causing harm to the environment and human health. Therefore, enterprises or industrial parks with certain harmful accident drainage have set up emergency accident pools to temporarily store wastewater, fire water, initial rainwater, etc. in the event of an accident (fire, explosion, leakage accident).

[0003] At present, the commonly used emergency accident pool is a temporary storage pool set up to prevent contaminated water from entering the municipal water pipeline or natural water body under the state of the accident. It mainly collects production wastewater, accident wastewater, firefighting wastewater, initial rainwater, etc. that cannot be accommodated by the existing pollution collection system (cofferdam, dike, fire dike, buffer pool, etc.) in the factory area and the scope of the accident during the accident. The emergency accident pool has the characteristics of permanent setting, temporary storage, and service for the whole factory, as well as basic properties such as specificity, gravity, underground, large pool capacity, anti-corrosion, and anti-seepage. When treating high-concentration wastewater discharged by some factories such as chemical and petrochemical, emergency accident pools are generally set up. The reason is that when these factories have production accidents, a large amount of high-concentration organic wastewater with large pH fluctuations will be discharged in a short period of time. If these wastewaters directly enter the sewage treatment system, they will bring a high impact load to the operating biological treatment system. The impact will take a long time to recover, and sometimes cause fatal damage. In order to avoid the impact of accident water on the sewage treatment system, an emergency accident pool is set up to store accident water. Emergency accident pools are generally kept empty to ensure that they can play their due role during special time periods. However, the design of emergency accident pools focuses on storage and diversion functions, while ignoring the oil separation function. However, in many accident scenarios, large-scale leakage of oil substances is inevitable. If the oil pollution is not effectively treated and is directly discharged into the downstream sewage treatment plant, it will cause a series of problems such as equipment blockage and reduced biological treatment efficiency, posing safety hazards to the environment and sewage treatment plants. Summary of the invention

[0004] In response to the current technical problems, the present invention aims to provide an emergency accident pool with integrated oil separation function and a method for separating oil pollutants thereof. The emergency accident pool can solve the technical problem that the existing technology cannot effectively separate oil pollutants in accident water.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] An emergency accident pool with integrated oil separation function comprises an emergency accident pool body, a water inlet pipe is provided on one side wall of the emergency accident pool body along the length direction, and a drain pipe is provided on the other side wall, and the drain pipe is connected to the outlet end of a delivery pump arranged in the emergency accident pool body; its structural features are: a guide wall is provided in the width direction of the emergency accident pool body, the guide wall is arranged on the side close to the drain pipe, and the guide wall divides the emergency accident pool body into a separation area and a lifting area; a rectifying hole is provided at the lower part of the guide wall, and the separation area and the lifting area are connected through the rectifying hole; the delivery pump is arranged in the lifting area, and the water inlet pipe is located on the side wall of the separation area.

[0007] When the emergency accident pool of the present invention is used, the accident water enters the separation zone through the water inlet pipe. Since the volume of the separation zone is large, the accident water with a large flow rate and flow rate can be buffered in the separation zone. At the same time, the oil pollutants in the accident water float to the water surface, the heavy oil pollution and other impurities are precipitated to the bottom of the separation zone, and the accident water without oil pollution flows into the lifting area through the rectifying hole, and is discharged through the delivery pump, thereby realizing efficient separation of oil and water. The emergency accident pool with integrated oil separation function of the present invention combines the characteristics of the oil separator and the emergency accident pool, adopts the principle of physical separation, and utilizes the density difference between oil droplets and water to make the oil pollution naturally float to the water surface, thereby realizing efficient oil-water separation, thereby effectively preventing oil pollutants from spreading to the external environment.

[0008] Preferably, a baffle wall is provided in the lifting area, the baffle wall is arranged opposite to the guide wall, and the delivery pump is arranged between the baffle wall and the side wall provided with the drain pipe. By providing the baffle wall, the accident water needs to overflow the baffle wall to enter the inlet of the delivery pump, and the baffle wall can determine the stop level of the delivery pump.

[0009] Preferably, the top wall of the baffle wall is located above the rectifying hole, and the height of the baffle wall is at least 50 cm higher than the height of the top wall of the rectifying hole.

[0010] Preferably, the baffle wall and the guide wall are arranged in parallel and at intervals.

[0011] Specifically, a sloped bottom plate is provided at the bottom of the separation zone, and the guide wall is located at the bottom side of the sloped bottom plate. By providing the sloped bottom plate, heavy oil and other pollutants are gathered at the bottom side of the sloped bottom plate, which is convenient for collection and discharge.

[0012] Specifically, a maintenance hole is provided on the top of the separation zone, and the maintenance hole is located above the bottom side of the sloped bottom plate. When cleaning the oil in the separation zone, the maintenance hole is opened and the oil is discharged through the oil suction pump.

[0013] Preferably, the distance between the rectifying hole and the bottom of the guide wall is 25-40 cm. Since impurities such as heavy oil settle to the bottom of the separation zone, setting the rectifying hole at a certain height can prevent the impurities at the bottom from entering the lifting zone.

[0014] Preferably, a plurality of rectifying holes are provided at the lower portion of the guide wall, and the plurality of rectifying holes are evenly spaced along the length direction of the guide wall.

[0015] Preferably, a liquid level meter is provided in the lifting area, and the liquid level meter and the delivery pump are connected to the control system. The liquid level height of the lifting area is measured by the liquid level meter and the control system is monitored in real time to control the opening or closing of the delivery pump, thereby realizing automatic control and remote operation, ensuring that timely measures can be taken in the event of an accident to reduce environmental pollution and property losses.

[0016] Based on the same inventive concept, the present invention also provides a method for separating oil pollutants using an emergency accident pool with an integrated oil separation function, which uses the emergency accident pool with an integrated oil separation function as described above, and includes the following steps:

[0017] S1. The accident water enters the separation zone through the water inlet pipe and is buffered in the separation zone;

[0018] S2. Light oil in the accident water floats above the liquid surface, heavy oil settles to the bottom of the separation area, and the accident water without oil enters the lifting area through the rectifying hole;

[0019] S3. Open the delivery pump to discharge the accident water in the lifting area;

[0020] S4. The oil in the separation area is discharged through the oil suction pump.

[0021] The method for separating oil pollutants in the emergency accident pool with integrated oil separation function of the present invention can deal with accident water with a large coefficient of variation and effectively intercept oil pollution, thereby reducing the operating cost and difficulty of downstream sewage treatment plants and improving treatment efficiency.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The emergency accident pool with integrated oil separation function of the present invention combines the characteristics of the oil separator and the emergency accident pool, adopts the physical separation principle, and utilizes the density difference between oil droplets and water to make the oil pollution float to the water surface naturally, thereby realizing efficient oil-water separation, thereby effectively preventing oil pollutants from spreading to the external environment.

[0024] 2. The method for separating oil pollutants in the emergency accident pool with integrated oil separation function of the present invention can cope with accident water with a large coefficient of variation and effectively intercept oil pollution, thereby reducing the operating cost and difficulty of downstream sewage treatment plants and improving treatment efficiency.

[0025] 3. The emergency accident pool with integrated oil separation function of the present invention realizes automatic control and remote operation by introducing intelligent equipment, ensuring that timely measures can be taken when an accident occurs to reduce environmental pollution and property losses. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the structure of the emergency accident pool with integrated oil separation function of the present invention;

[0027] Figure 2 yes Figure 1 Schematic diagram of the middle diversion wall structure.

[0028] In the figure

[0029] 1-water inlet pipe, 2-separation area, 3-sloped bottom plate, 4-empty pool liquid level, 5-diversion wall, 6-rectifier hole, 7-baffle wall, 8-delivery pump, 9-bracket, 10-drain pipe, 11-lifting area, 12-liquid level meter, 13-manhole, 14-top cover plate, 15-maximum liquid level, 16-emergency accident pool body. DETAILED DESCRIPTION

[0030] The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict. For the convenience of description, if the words "upper", "lower", "left" and "right" appear in the following, they only indicate that the upper, lower, left and right directions are consistent with the drawings themselves, and do not limit the structure.

[0031] like Figure 1 As shown, an emergency pool with integrated oil separation function provided in this embodiment includes an emergency pool body 16, and an inlet pipe 1 is provided on the upper part of the right side wall of the emergency pool body 16 along the length direction, and an emptying pipe 10 is provided on the upper part of the left side wall, and the emptying pipe 10 is connected to the outlet end of the delivery pump 8 arranged in the emergency pool body 16. The delivery pump 8 adopts an emptying pump, and the bottom of the emptying pump is connected to the mounting seat located at the bottom of the emergency pool body 16, and can be lifted upward by a guide rail. The water inlet pipe 1 is located at the highest liquid level 15 of the emergency pool body 16, and the emptying pipe 10 is located above the highest liquid level 15. A guide wall 5 is provided in the emergency pool body 16 along the width direction, and the guide wall 5 is arranged on the side close to the emptying pipe 10, and the guide wall 5 divides the emergency pool body 16 into a separation zone 2 and a lifting zone 11. The separation zone 2 is located on the right side, and the lifting zone 11 is located on the left side. As shown Figure 2As shown, a plurality of rectifying holes 6 are arranged at the bottom of the guide wall 5 at even intervals along the length direction of the guide wall 5. The distance between the rectifying holes 6 and the bottom of the guide wall 5 is 25 to 40 cm. The separation zone 2 and the lifting zone 11 are connected through the rectifying holes 6. A baffle wall 7 is arranged in the lifting zone 11, and the baffle wall 7 is arranged relatively parallel to the guide wall 5. The delivery pump 8 is arranged between the baffle wall 7 and the left side wall. The baffle wall 7 and the guide wall 5 can be made of steel structure (Q235, SUS304, etc.), engineering plastics (PP, etc.), and glass fiber reinforced plastics. The top wall of the baffle wall 7 is located above the rectifying holes 6, and the height of the baffle wall 7 is at least 50 cm higher than the height of the top wall of the rectifying holes 6. A sloped bottom plate 3 is provided at the bottom of the separation zone 2, and the guide wall 5 is located at the bottom side of the slope of the sloped bottom plate 3. An inspection hole 13 is provided at the top of the separation zone 2, and the inspection hole 13 is located above the bottom side of the sloped bottom plate 3, and a top cover plate 14 is provided on the right side of the inspection hole 13. A liquid level meter 12 is provided in the lifting zone 11, and the liquid level meter 12 and the delivery pump 8 are connected to the control system. One end of the drain pipe 10 passes through the side wall of the emergency accident pool body 16, and the other end extends along the side wall of the emergency accident pool body 16 to the bottom of the lifting zone 11 and is connected to the delivery pump 8, and the drain pipe 10 is fixedly connected to the left side wall of the emergency accident pool body 16 through multiple brackets 9.

[0032] This embodiment also provides a method for separating oil pollutants using an emergency accident pool with an integrated oil separation function, using the emergency accident pool with an integrated oil separation function as described above, including the following steps:

[0033] S1. The accident water enters the separation zone 2 through the water inlet pipe 1 and is buffered in the separation zone 2;

[0034] S2. Light oil in the accident water floats above the liquid surface, heavy oil settles to the bottom of the separation zone 2, and the accident water without oil enters the lifting zone 11 through multiple rectifying holes 6;

[0035] S3. Open the delivery pump 8 to discharge the accident water in the lifting area 11;

[0036] S4. The oil in separation zone 2 is discharged through the oil suction pump.

[0037] The emergency pool with integrated oil separation function of this embodiment is applied to the test run area of ​​a large machinery production base to collect initial rainwater and accident water in a non-powered gravity flow manner. The designed effective volume is: 600m 3. The proposed emergency pool body 16 is 18m long, 11m wide, 5.0m deep, and has an effective water depth of 3.1m, which is the height difference between the highest liquid level 15 in the emergency pool body 16 and the empty pool liquid level 4. The distance between the diversion wall 5 and the left side wall of the emergency pool body 16 is 1.9m, the height of the baffle wall 7 is 90cm, the spacing between the rectifying hole 6 and the bottom of the diversion wall 5 is 25cm, and the distance between the rectifying hole 6 and the empty pool liquid level 4 above is 0.5m. The horizontal flow velocity of oily wastewater in the emergency pool body 16 is generally 2-5mm / s, and should not be greater than 15mm / s. Initial rainwater: It is advisable to take the rainfall of 15min-30min in the initial stage of a rainfall, or the rainfall of 20mm-30mm thickness in the initial stage of rainfall. Discharge flow: 6.25-12.5m 3 / h (the emptying conversion flow time is selected as 48 to 96 hours). In order to ensure the smooth flow of water in the separation zone 2, the flow velocity in the rectifying hole 6 should be 0.05 to 0.15 m / s.

[0038] The integrated oil separation function requires calculation of the horizontal flow velocity and rectifying holes of the following water flow sections. The calculation process is as follows:

[0039] (1) Calculation of horizontal flow velocity in water flow section

[0040] In order to prevent the suspended oil droplets from flowing into the lifting area 11 with the water during the water intake process, the calculation is carried out according to the most unfavorable situation, that is, when the pump is stopped and the liquid level is filled with water, the water-passing cross-sectional area is the smallest: 11m×0.5m=5.5m 2 As the liquid level in the emergency pool body 16 increases, the water flow section will increase. Figure 1 shown.

[0041] The cross section of the lifting area 11 is 11m×1.9m=20.9m 2 The liquid level in the lifting area rises synchronously with the water inflow of the oil-water separation area. At the same time, according to the definition of initial rainwater, the maximum horizontal flow velocity of the water-passing section is calculated by taking the rainfall of 15 minutes:

[0042] 20.9m 2 ×3.1m×1000÷5.5m 2 ÷15min÷60=13.09mm / s<15mm / s

[0043] After calculation, the horizontal flow velocity of the water section in the oil-water separation zone of the accident emergency pool meets the requirements for the selection of process parameters.

[0044] (2) Calculation of rectifier holes

[0045] In order to ensure the smooth flow of water in the separation zone, the rectification measures from the separation zone 2 to the lifting zone 11 adopt a combination of a guide wall 5 with a rectification hole 6 and a baffle wall 7. The guide wall 5 can guide and adjust the water flow through its specific structural design, so that the water flow can become more stable when passing through the guide wall 5. In deep water flow generation, the setting of the guide wall 5 can significantly reduce the turbulence of the water flow and improve the stability of the water flow. The baffle wall 7 is mainly used to block and adjust the flow direction and flow rate of the water flow. By reasonably setting the height, position and shape of the baffle wall 7, the distribution and flow state of the water flow can be effectively controlled, and the stability of the water flow in the separation zone can be further ensured.

[0046] After the emergency pool receives sewage, it needs to be emptied and kept for standby within 2 to 4 days. Considering the cost factors such as the design scale of the downstream sewage station, the emptying flow rate is 6.25m3 if it is emptied within 4 days. 3 / h; at the same time, the average water flow rate of the rectifying hole 6 of the diversion wall 5 when the accident emergency pool is filled with water is calculated as:

[0047] 20.9m 2 ×3.1m×1000÷15min÷60=72L / s

[0048] When water is flowing in, the flow rate of the rectifying holes 6 of the diversion wall 5 is much greater than the flow rate when emptying. Therefore, the rectifying holes 6 are designed to be based on the flow rate when water is flowing in. The flow rate of the rectifying holes 6 is 0.15m / s, and the diameter of a single rectifying hole 6 is DN200mm. The number of rectifying holes 6 on the diversion wall 5 of the emergency accident pool is calculated as follows:

[0049] 72L / s÷1000÷0.15m / s÷(0.2 2 m 2 ×π÷4)=15.3

[0050] Rounding up, the number of DN200mm rectifying holes 6 on the guide wall 5 needs to be designed to be 16, and the hole center spacing is:

[0051] 11000mm÷(16+1)=647mm, rounded up to 650mm.

[0052] (3) Water quality after implementation

[0053] After the project was implemented, the "petroleum" index of the inlet and outlet water was monitored, and the monitoring data is shown in the following table. This technology can effectively isolate suspended oil droplets and discharge them into the subsequent treatment process.

[0054]

[0055] The contents explained in the above embodiments should be understood as these embodiments are only used to more clearly illustrate the invention, and are not used to limit the scope of the invention. After reading the present invention, various equivalent forms of modifications to the embodiments by those skilled in the art fall within the scope defined by the claims attached to the present invention.

Claims

1. An emergency pool with integrated oil separation function, comprising an emergency pool body (16), wherein a water inlet pipe (1) is provided on one side wall of the emergency pool body (16) along the length direction, and an emptying pipe (10) is provided on the other side wall, wherein the emptying pipe (10) is connected to the outlet end of a delivery pump (8) arranged in the emergency pool body (16); characterized in that: A guide wall (5) is provided in the width direction of the emergency accident pool body (16), and the guide wall (5) is arranged on a side close to the drain pipe (10), and the guide wall (5) divides the emergency accident pool body (16) into a separation area (2) and a lifting area (11); a rectifying hole (6) is provided at the lower part of the guide wall (5), and the separation area (2) and the lifting area (11) are connected through the rectifying hole (6); the delivery pump (8) is arranged in the lifting area (11), and the water inlet pipe (1) is located on the side wall of the separation area (2).

2. The emergency pool with integrated oil separation function according to claim 1 is characterized by: A baffle wall (7) is provided in the lifting area (11), and the baffle wall (7) is arranged opposite to the guide wall (5). The delivery pump (8) is arranged between the baffle wall (7) and a side wall provided with an exhaust pipe (10).

3. The emergency pool with integrated oil separation function according to claim 2 is characterized by: The top wall of the baffle wall (7) is located above the rectifying hole (6), and the height of the baffle wall (7) is at least 50 cm higher than the height of the top wall of the rectifying hole (6).

4. The emergency pool with integrated oil separation function according to claim 2 is characterized by: The baffle wall (7) and the guide wall (5) are arranged in parallel and at intervals.

5. The emergency pool with integrated oil separation function according to claim 1 is characterized by: A sloped bottom plate (3) is provided at the bottom of the separation zone (2), and a guide wall (5) is located at the bottom side of the slope of the sloped bottom plate (3).

6. The emergency pool with integrated oil separation function according to claim 5 is characterized by: The top of the separation zone (2) is provided with an inspection hole (13), and the inspection hole (13) is located above the bottom side of the slope of the sloped bottom plate (3).

7. The emergency pool with integrated oil separation function according to claim 1 is characterized by: The distance between the rectifying hole (6) and the bottom of the guide wall (5) is 25 to 40 cm.

8. The emergency pool with integrated oil separation function according to claim 7 is characterized by: A plurality of rectifying holes (6) are arranged at the lower part of the guide wall (5), and the plurality of rectifying holes (6) are evenly spaced along the length direction of the guide wall (5).

9. The emergency pool with integrated oil separation function according to any one of claims 1 to 8, characterized in that: A liquid level meter (12) is provided in the lifting area (11), and the liquid level meter (12) and the delivery pump (8) are both connected to a control system.

10. A method for separating oil pollutants in an emergency pool with integrated oil separation function, characterized in that: The emergency pool with integrated oil separation function according to any one of claims 1 to 9 comprises the following steps: S1. The accident water enters the separation zone (2) through the water inlet pipe (1) and is buffered in the separation zone (2); S2. Light oil in the accident water floats above the liquid surface, heavy oil settles to the bottom of the separation zone (2), and the accident water without oil enters the lifting zone (11) through the rectifying hole (6); S3. Open the delivery pump (8) to discharge the accident water in the lifting area (11); S4. The oil in the separation zone (2) is discharged through the oil suction pump.

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