A system and method for treating oily wastewater from an oil storage cavern.

Abstract

The present invention discloses a system and method for treating oily wastewater from an oil storage cavern, comprising a tank chamber liquid collection unit, a channel liquid collection unit, and a separation unit. The separation unit comprises an inlet water seal chamber, an outlet water seal chamber, an explosion-proof chamber, an oil storage chamber, and a sludge chamber. An oil separator is provided between the inlet and outlet water seal chambers. The explosion-proof chamber is positioned to one side of the inlet water seal chamber, and an oil overflow trough, the bottom of which is higher than the bottom of the oil separator, is provided between the explosion-proof chamber and the inlet water seal chamber. The oil storage chamber is positioned to one side of the explosion-proof chamber and communicates with the explosion-proof chamber via an oil outlet hole. The oil outlet hole is positioned at one end of the explosion-proof chamber and is provided with an explosion-proof grille. The sludge chamber communicates with the outlet water seal chamber via a sludge discharge device. The oil storage chamber is connected to an oil drain pipe for conveying oil to the outside of the cavern. The outlet water seal chamber is connected to a drain pipe for conveying water to the outside of the cavern. The explosion-proof chamber is connected to a vent pipe for conveying air to the outside of the cavern. The system is highly safe, can achieve sludge separation, and is not easily clogged by sludge.

Description

Technical Field

[0001] This invention belongs to the field of oily wastewater treatment technology, and specifically relates to an oily wastewater treatment system and method for oil storage caverns. Background Technology

[0002] The safe discharge and proper disposal of oily wastewater, such as surface washing water and equipment condensate, from oil storage tanks and passageways in oil storage caverns affect the safe and stable operation of these caverns.

[0003] However, the current oily wastewater drainage system has the following problems in the drainage process.

[0004] First, silt easily accumulates in oily wastewater drainage systems, causing poor drainage or even clogging of the oily wastewater drainage system.

[0005] Secondly, the accumulated silt is prone to fermentation and produces toxic gases, which can easily lead to accidents and has low safety performance. Summary of the Invention

[0006] To address the issues of low safety and susceptibility to sludge clogging in existing methods for treating oily wastewater in oil storage caverns, this invention provides an oily wastewater treatment system and method for oil storage caverns, which offers high safety, enables sludge separation, and is less prone to sludge clogging.

[0007] The objective of this invention is achieved through the following technical solution:

[0008] The first aspect of the present invention discloses an oily wastewater treatment system for an oil storage cavern, comprising a tank chamber liquid collection unit disposed in the oil storage tank chamber, a channel liquid collection unit disposed in the internal channel, and a separation unit disposed in the closed channel;

[0009] The tank chamber liquid collection unit and the channel liquid collection unit, as well as the channel liquid collection unit and the separation unit, are all connected by oily wastewater pipes;

[0010] The separation unit includes an inlet water seal chamber, an outlet water seal chamber, an explosion-proof chamber, an oil storage chamber, and a sedimentation chamber;

[0011] An oil separator is provided between the inlet water seal chamber and the outlet water seal chamber;

[0012] The explosion-proof chamber is located on one side of the water inlet water seal chamber, and an oil overflow trough with its bottom higher than the bottom of the oil separator is provided between the explosion-proof chamber and the water inlet water seal chamber;

[0013] The oil storage chamber is located on one side of the explosion-proof chamber and is connected to the explosion-proof chamber through an oil outlet. An explosion-proof grille is provided at one end of the explosion-proof chamber where the oil outlet is located.

[0014] The sedimentation chamber and the outlet water seal chamber are connected by a sludge discharge device;

[0015] The oil storage chamber is connected to an oil drain pipe for transporting oil to the outside of the cave.

[0016] The water outlet water seal chamber is connected to a drainage pipe that transports water to the outside of the hole;

[0017] The explosion-proof chamber is connected to a vent pipe for delivering gas to the outside of the cave.

[0018] The second aspect of this invention discloses a method for treating oily wastewater from an oil storage cavern, comprising the following steps:

[0019] An oil storage cavern oily wastewater treatment system as described in the first aspect is installed inside the cavern, so that the oily wastewater inside the oil storage tank is collected to the tank chamber liquid collection unit and then flows to the separation unit. The separated water, oil and gas are discharged to the outside of the cavern in sequence through the drain pipe, the oil discharge pipe and the vent pipe.

[0020] Compared with the prior art, the present invention has at least the following advantages and beneficial effects:

[0021] 1. This solution effectively separates water, oil, and gas and discharges them outside the hole by setting up a separation unit, and can also achieve sludge sedimentation, avoiding sludge from clogging subsequent drainage pipes.

[0022] 2. This solution, by setting up an explosion-proof chamber, has the function of explosion-proof wave absorption, effectively eliminating shock waves in case of accidents, playing a good preventive role, and is highly safe.

[0023] 3. This solution separates oil and water in oily wastewater, discharging them separately to their respective discharge areas, which can significantly reduce the scale of subsequent wastewater treatment facilities and greatly reduce treatment costs. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the system structure of the present invention;

[0026] Figure 2 This is a cross-sectional view of the system of the present invention;

[0027] Figure 3 This is a schematic diagram of the separation unit;

[0028] Figure 4for Figure 3 AA cross-section diagram;

[0029] Figure 5 for Figure 3 BB cross-section diagram;

[0030] Figure 6 for Figure 3 CC cross-section diagram. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0033] It should be noted that, unless otherwise specified, the embodiments and features described in this invention can be combined with each other.

[0034] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0035] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0036] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0037] This invention discloses an oily wastewater treatment system for oil storage caverns. The system is installed inside the oil storage cavern, such as... Figure 1 As shown, the tunnel contains, in sequence, an oil storage tank chamber 1, an internal passage 3, a sealed passage 5, and an opening passage 7. Figures 1 to 6 As shown, the system includes a tank chamber liquid collection unit 2 installed in the oil storage tank chamber 1, a channel liquid collection unit 4 installed in the internal channel 3, and a separation unit 6 installed in the sealed channel 5.

[0038] The tank chamber liquid collection unit 2 and the channel liquid collection unit 4, as well as the channel liquid collection unit 4 and the separation unit 6, are all connected by an oily wastewater pipe 8.

[0039] like Figure 3 As shown, the separation unit 6 includes an inlet water seal chamber 601, an outlet water seal chamber 602, an explosion-proof chamber 603, an oil storage chamber 604, and a sedimentation chamber 605.

[0040] Specifically, an oil separator 606 is installed between the inlet water seal chamber 601 and the outlet water seal chamber 602. Since oil floats on the water surface, there is a certain height gap between the oil separator and the bottom, forming a water seal zone 612 and a sedimentation zone 613. The water seal zone 612 is used for water passage, that is, water in the inlet water seal chamber 601 is discharged into the outlet water seal chamber 602. The sedimentation zone 613 is used for settling sludge. The separator can block oil, preventing it from entering the outlet water seal chamber 602.

[0041] An explosion-proof chamber 603 is placed on one side of the water inlet seal chamber 601, and an oil overflow trough with its bottom higher than the bottom of the oil separator 606 is provided between the explosion-proof chamber 603 and the water inlet seal chamber 601. The bottom of the oil overflow trough is higher than the oil separator, so the blocked oil can enter the explosion-proof chamber 603 along the oil overflow trough to achieve water-oil separation.

[0042] An oil storage chamber 604 is located on one side of the explosion-proof chamber 603 and is connected to the explosion-proof chamber 603 through an oil outlet 609. An explosion-proof grille 608 is provided at one end of the oil outlet 609 located in the explosion-proof chamber 603.

[0043] The sedimentation chamber 605 is connected to the outlet water seal chamber 602 via a sediment discharge device;

[0044] The oil storage chamber 604 is connected to an oil drain pipe 10 for transporting oil to the outside of the cave; the water outlet water seal chamber 602 is connected to a drain pipe 11 for transporting water to the outside of the cave; and the explosion-proof chamber 603 is connected to a vent pipe 9 for transporting gas to the outside of the cave.

[0045] By adopting the above technical solution, the oil-water mixture is collected by setting up a tank collection unit 2 in the oil storage tank chamber 1. Then, the oil and water are separated by the separation unit 6, and the water, oil, and gas are discharged outside the cavern through the drain pipe 11, the oil drain pipe 10, and the vent pipe 9. The separation unit 6 can effectively intercept sediment, reduce sediment blockage, and improve drainage capacity. The vent pipe 9 can promptly discharge any toxic gases generated, reduce the risk of poisoning, and ensure the safety of the oil storage cavern. By setting up an explosion-proof chamber, the shock wave from an explosion in case of an accident can be promptly dissipated, reducing the harm of the shock wave and ensuring the safety of the oil storage cavern. The separation unit effectively separates oil and water in the oily wastewater, reducing the scale and investment of subsequent treatment facilities.

[0046] To facilitate adjustment of the oil spill height, an oil spill plate 607 is provided on the oil spill trough for adjusting the spill height. By replacing the oil spill plate 607 with different heights, different oil spill heights can be achieved. Preferably, oil spill plate mounting slots can be provided on both sides of the oil spill trough.

[0047] For ease of maintenance, such as Figure 1 , 2 As shown, the channel liquid collection unit 4 includes an inspection well 403, a sealed well cover 404 for sealing the inspection well 403, an explosion-proof water seal floor drain 401 installed on the internal channel 3, and a floor drain connecting pipe 402 connecting the explosion-proof water seal floor drain 401 and the inspection well 403.

[0048] An explosion-proof water-sealed floor drain 401 is installed in the internal passage 3 at the location where drainage is required. It is made of stainless steel and drains water to the inspection well 403 through the floor drain connecting pipe 402. The inspection well 403 is arranged at a certain distance along the longitudinal direction of the oily wastewater pipe 8 in the internal passage 3 and is responsible for the maintenance of the oily wastewater pipe 8. The sealed well cover 403 is installed on the top of the inspection well 403 to meet the explosion-proof and maintenance requirements of the location.

[0049] To facilitate the installation of the tank chamber liquid collection unit 2 and the collection of wastewater, the tank chamber liquid collection unit 2 includes an open ground drainage ditch 201 surrounding the oil storage tank chamber 1 and a collection pit 202 connected to the open ground drainage ditch 201. Furthermore, the open ground drainage ditch 201 has a width greater than or equal to 0.2m and a depth greater than or equal to 0.2m; the collection pit 202 is located at the outlet of the oil storage tank chamber 1 and has a depth greater than or equal to 0.6m. The bottom of the collection pit 202 forms a sedimentation trough 203, with a depth greater than or equal to 0.25m.

[0050] To facilitate the discharge of sludge from the bottom of the outlet water seal chamber 602, the bottom of the outlet water seal chamber 602 is inclined, and one end of the sludge discharge device is placed at the lower end of the outlet water seal chamber 602. The sludge discharge device includes a sludge discharge pipe 610 and a sludge discharge valve 611 installed on the sludge discharge pipe 610.

[0051] A vent cap 91 can be installed at the end of the vent tube 9.

[0052] In one specific implementation:

[0053] The ground water collection ditch 201 is set around the oil storage tank room 1, and the dimensions of the liquid collection pit 202 are length × width = 0.4m × 0.4m or length × width = 0.6m × 0.6m.

[0054] Separation unit 6 is located at the bottom of the sealed channel 5. The width of the inlet water seal chamber 601 and the outlet water seal chamber 602 is greater than or equal to 1.0m, and the total longitudinal length of the inlet water seal chamber 601 and the outlet water seal chamber 602 is greater than or equal to 1.0m. The explosion-proof chamber 603 and the oil storage chamber have a transverse width greater than or equal to 0.5m, and their total longitudinal length is the same as the total longitudinal length of the inlet water seal chamber 601 and the outlet water seal chamber 602, filled with clean gravel with a particle size of 3-4cm. The sludge chamber 605 has a width greater than or equal to 0.5m, and its longitudinal length is the same as the total longitudinal length of the inlet water seal chamber 601 and the outlet water seal chamber 602, but its depth is 0.3m less than the height of the bottom plates of the inlet water seal chamber 601 and the outlet water seal chamber 602. The bottom of the oil separator 606 is connected to the bottom of the inlet water seal chamber 601 and the outlet water seal chamber 602. The water surface in the water seal chamber 602 is level with the water surface, and the upper part is connected to the upper structure of the separation unit 6. The oil overflow plate 607 is at least 0.3m higher than the water surface in the inlet water seal chamber 601 and the outlet water seal chamber 602, and an oil passage is left at the top. The diameter of the oil outlet hole 609 is at least 100mm. The explosion-proof grid 608 is a welded grid made of steel bars with a diameter of 16mm. The bottom of the sludge discharge pipe 610 is level with the bottom of the outlet water seal chamber 602, and discharges the sludge in the sludge settling area 613 to the sludge settling chamber 605. The pipe diameter is at least 200mm. The specifications of the sludge discharge valve 611 are matched with those of the sludge discharge pipe 610. The water seal depth of the water seal area 612 and the sludge settling depth of the sludge settling area 613 are both at least 0.25m.

[0055] The longitudinal slope of the drain pipe 11 and the oil drain pipe 10 shall not be less than 0.003, and the pipe diameter shall not be less than 250mm; the diameter of the vent pipe 9 shall not be less than 32mm, and the vent cap 91 shall be matched with the vent pipe 9 and shall be a one-way vent cap, that is, it can only vent air and cannot vent air in.

[0056] Ventilation pipe 9 is laid from separation unit 6 along the bottom of the inlet passage 7 to the green area 12 outside the tunnel. Oil drain pipe 10 is laid from separation unit 6 along the bottom of the inlet passage 7 to the oil receiving area outside the tunnel. Drainage pipe 11 is laid from separation unit 6 along the bottom of the inlet passage 7 to the drainage point outside the tunnel.

[0057] By installing any of the above-mentioned oily wastewater treatment systems in the oil storage cavern, the oily wastewater in the oil storage tank 1 can be collected in the tank chamber liquid collection unit 2 and then flow into the separation unit 6. The separated water, oil, and gas are discharged to the outside of the cavern in sequence through the drain pipe 11, the oil discharge pipe 10, and the vent pipe 9.

[0058] The technology employed in this solution effectively intercepts sludge in the oily wastewater system by setting up sludge tanks and sludge zones, reducing sludge blockage; it also promptly discharges toxic gases generated by the oily wastewater system through ventilation pipes, reducing the risk of poisoning; it eliminates wartime blast waves in a timely manner by setting up an explosion-proof room, reducing the harm caused by blast waves; and it effectively separates oil and water in the oily wastewater by setting up a separation unit, reducing the scale and investment of subsequent treatment facilities.

[0059] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A system for treating oily wastewater from an oil storage cavern, characterized in that, It includes a tank chamber liquid collection unit (2) installed in the oil storage tank chamber (1), a channel liquid collection unit (4) installed in the internal channel (3), and a separation unit (6) installed in the closed channel (5). The tank chamber liquid collection unit (2) and the channel liquid collection unit (4), and the channel liquid collection unit (4) and the separation unit (6) are all connected by an oily wastewater pipe (8); The separation unit (6) includes an inlet water seal chamber (601), an outlet water seal chamber (602), an explosion-proof chamber (603), an oil storage chamber (604), and a sedimentation chamber (605). An oil separator (606) is provided between the inlet water seal chamber (601) and the outlet water seal chamber (602). The explosion-proof chamber (603) is located on one side of the water inlet water seal chamber (601), and an oil overflow trough with its bottom higher than the bottom of the oil separator (606) is provided between the explosion-proof chamber (603) and the water inlet water seal chamber (601); The oil storage chamber (604) is located on one side of the explosion-proof chamber (603) and communicates with the explosion-proof chamber (603) through the oil outlet (609). The oil outlet (609) is located at one end of the explosion-proof chamber (603) and is provided with an explosion-proof grille (608). The sedimentation chamber (605) and the outlet water seal chamber (602) are connected by a sludge discharge device; The oil storage chamber (604) is connected to an oil drain pipe (10) for transporting oil to the outside of the cave. The water outlet water seal chamber (602) is connected to a drain pipe (11) that transports water to the outside of the hole. The explosion-proof chamber (603) is connected to a vent pipe (9) for delivering gas to the outside of the cave. The tank chamber liquid collection unit (2) includes a ground water collection ditch (201) arranged around the oil storage tank chamber (1) and a liquid collection pit (202) connected to the ground water collection ditch (201). The width of the ground drainage ditch (201) is greater than or equal to 0.2m and the depth is greater than or equal to 0.2m; The liquid collection pit (202) is located at the outlet of the oil storage tank chamber (1) and has a depth of 0.6m or more.

2. The oily wastewater treatment system for oil storage caverns according to claim 1, characterized in that: The oil overflow tank is equipped with an oil overflow plate (607) for adjusting the oil overflow height.

3. The oily wastewater treatment system for oil storage caverns according to claim 1, characterized in that: The channel liquid collection unit (4) includes a manhole (403), a sealed manhole cover (404) for sealing the manhole (403), an explosion-proof water seal drain (401) installed on the internal channel (3), and a drain connection pipe (402) connecting the explosion-proof water seal drain (401) and the manhole (403).

4. The oily wastewater treatment system for oil storage caverns according to claim 1, characterized in that: The inlet water seal chamber (601) and the outlet water seal chamber (602) have a width greater than or equal to 1.0m and a total longitudinal length greater than or equal to 1.0m; The explosion-proof chamber (603) and the oil storage chamber (604) have a transverse width greater than or equal to 0.5m, and the total longitudinal length of the explosion-proof chamber (603) and the oil storage chamber (604) is the same as the total longitudinal length of the inlet water seal chamber (601) and the outlet water seal chamber (602). The explosion-proof chamber (603) is filled with gravel with a particle size of 3-4 cm; The sludge chamber (605) has a width greater than or equal to 0.5m, a longitudinal length that is the same as the total longitudinal length of the inlet water seal chamber (601) and the outlet water seal chamber (602), and a depth that is 0.3m less than the height of the bottom plate of the inlet water seal chamber (601) and the outlet water seal chamber (602). The diameter of the oil outlet (609) is greater than or equal to 100 mm; The explosion-proof grille (608) is made of welded steel bars with a diameter of 16mm; The sludge discharge device includes a sludge discharge pipe (610) and a sludge discharge valve (611) installed on the sludge discharge pipe (610). The bottom of the sludge discharge pipe (610) is flush with the bottom of the water seal chamber (602), and the pipe diameter is greater than or equal to 200 mm.

5. The oily wastewater treatment system for an oil storage cavern according to claim 1, characterized in that: The bottom of the outlet water seal chamber (602) is inclined and one end of the sludge discharge device is placed at the lower end of the outlet water seal chamber (602).

6. The oily wastewater treatment system for oil storage caverns according to claim 1, characterized in that: The longitudinal slope of the drain pipe (11) and the oil drain pipe (10) shall not be less than 0.003, and the pipe diameter shall not be less than 250mm; the diameter of the vent pipe (9) shall not be less than 32mm.

7. A method for treating oily wastewater from an oil storage cavern, characterized in that, Includes the following steps: An oil storage cavern oily wastewater treatment system according to any one of claims 1 to 6 is installed inside the oil storage cavern so that the oily wastewater in the oil storage tank chamber (1) is collected to the tank chamber liquid collection unit (2) and then flows to the separation unit (6). The separated water, oil and gas are discharged to the outside of the cavern in sequence through the drain pipe (11), the oil drain pipe (10) and the vent pipe (9).

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