KR20210120200A - Oil recovery tank and oil recovery device including the same - Google Patents

Abstract

Disclosed are an oil recovery tank and an oil recovery device including the same. In accordance with an embodiment of the present invention, an oil recovery tank having an inlet through which oil flows has the shape of at least one deformation among a deformation in which, in the basic shape of a rectangular parallelepiped, front lower slopes inclined from front to rear are formed in a front lower part, a deformation in which front side slopes inclined from front to rear are formed in a front side, a deformation in which rear side slopes inclined from rear to front are formed in a rear side, and a deformation in which rear lower slopes inclined from the rear to front are formed in a rear lower part. The length, width, and height of the basic shape are P, Q, and R, respectively. P is 12D or more and 18D or less, Q is 2.5D or more and 5.5D or less, R is 1D or more and 3D or less, and D is the hydraulic diameter of the inlet. Therefore, transfer efficiency can be increased.

Description

Oil recovery tank and oil recovery device including the same

The present invention relates to an oil recovery tank and an oil recovery device including the same.

Recently, water pollution or marine pollution by industrial waste oil or sea oil spillage has reached a serious level. Such marine pollution is not only a threat to the marine ecosystem, but ultimately a great threat to humans.

Regulations for preventing such water pollution or marine pollution are being newly established or strengthened worldwide.

In line with this trend, technology development for effectively removing oil, which is a cause of water pollution and marine pollution, is being made. These technologies essentially have a storage tank for storing the recovered oil.

However, the conventional storage tank for oil recovery is simply designed by imitating the shape of the existing hull or barge without focusing on the shape. In other words, tanks are being designed with great attention to storage capacity, maximum filling and discharging, flexibility in consideration of simplicity, and materials.

However, this lacks consideration of underwater drag according to the shape of the tank to be towed, so additional energy is required or transport is difficult depending on operating conditions (ex. current) or environment (ex. waves). For reference, if the underwater drag is large, the resistance applied to the tank increases, and accordingly, there is a problem in that the energy consumption for towing the tank increases.

In particular, in the case of an oil recovery system that tows a storage tank for oil recovery and recovers oil, the design shape of the storage tank inevitably affects not only the operating efficiency of the entire system but also the oil recovery and transfer efficiency depending on the working conditions and environment.

An embodiment of the present invention is to provide an oil recovery tank having excellent energy efficiency due to low underwater drag and high storage capacity and excellent transport efficiency, and an oil recovery device including the same.

According to one aspect of the present invention, it is an oil recovery tank having an inlet through which oil is introduced. In a basic shape of a rectangular parallelepiped, a front lower inclined surface inclined from front to rear is formed in the front lower part, and a front lower inclined surface inclined from front to rear is formed on the front side. A modified form in which at least one of a deformation in which the front side inclined surface is formed, a deformation in which a rear side inclined surface inclined from rear to front is formed on the rear side, and a deformation in which a rear lower inclined surface inclined from rear to front is formed in the rear lower part The length, width, and height of the basic shape are P, Q, and R, respectively, wherein P is 12D or more and 18D or less, Q is 2.5D or more and 5.5D or less, and R is 1D or more and 3D or less, and An oil recovery tank may be provided, where D is the hydraulic diameter of the inlet.

In the basic form, it has a deformed shape in which a front lower inclined surface inclined from front to rear is formed in the lower front portion, and the angle between the front lower inclined surface and the horizontal plane is 16.74 degrees or more and 19.77 degrees or less. It may be characterized.

In the basic form, it has a deformed form in which a front side inclined surface inclined from front to rear is formed on the front side in the basic form, and the tangent value of the angle between the front side inclined surface and a vertical plane parallel to the longitudinal direction of the basic form is 2.52 or more It may be characterized as 3.37 or less.

In the basic form, it has a modified form in which a rear side inclined surface inclined from rear to front is formed on the rear side in the basic form, and the tangent value for the angle between the rear side inclined surface and a vertical plane parallel to the longitudinal direction of the basic form is 0 or more and 0.63 or less, or It may be characterized as 1.67 or more and 3.0 or less.

In the basic form, it has a modified form in which a rear side inclined surface inclined from rear to front is formed on the rear side in the basic form, and the width of the rear end of the modified form is 1.12D or more and 3.68D or less.

In the basic form, it has a deformed form in which a rear lower inclined surface inclined from rear to front is formed in the lower rear portion, the angle between the rear lower inclined surface and the horizontal plane is 25 degrees or more and 30 degrees or less, and the height of the rear end of the modified form is 0.8 It can be characterized as D or more and 1.0D or less.

In the above basic form, a deformation in which a front lower inclined surface inclined from front to rear is formed in the front lower portion, a deformation in which a front side inclined surface inclined from front to rear is formed in the front side portion, a rear side inclined surface inclined from rear to front in the rear side portion This deformation has a deformed form in which a rear lower inclined surface inclined from rear to front is formed in the lower rear portion, and the angle between the front lower inclined surface and the horizontal plane is 16.74 degrees or more and 19.77 degrees or less, and the front side inclined surface and The tangent value of the angle formed by the vertical plane parallel to the longitudinal direction of the basic shape is 2.52 or more and 3.37 or less, and the tangent value for the angle between the rear side inclined surface and the vertical plane parallel to the longitudinal direction of the basic shape is 0 or more and 0.63 or less, or 1.67 or more and 3.0 or less, the width of the rear end of the deformed form is 1.12D or more and 3.68D or less, the angle between the rear lower inclined surface and the horizontal plane is 25 degrees or more and 30 degrees or less, and the height of the rear end of the deformed form is 0.8 It can be characterized as D or more and 1.0D or less.

According to another aspect of the present invention, a water-oil mixture is introduced, an oil-water separation device for separating the mixture into water and oil, and the oil recovery device coupled with the oil-water separation device and recovering the oil discharged from the oil-water separation device An oil recovery device comprising a tank may be provided.

According to an embodiment of the present invention, the energy efficiency is good in the towing process by reducing drag in the water while having excellent storage properties.

1 is a view showing an oil recovery apparatus according to an embodiment of the present invention.
2 is a view showing a basic form of an oil recovery tank according to various embodiments of the present invention.
FIG. 3 is a view showing an example of an oil recovery tank having a modified form modified from the basic form shown in FIG. 2 .
4 is a side view of the oil recovery tank shown in FIG. 3 .
FIG. 5 is a view from above of the oil recovery tank shown in FIG. 3 .
6 is experimental data of the oil recovery tank according to the first embodiment of the present invention.
7 is experimental data of the oil recovery tank according to the second embodiment of the present invention.
8 is experimental data of an oil recovery tank according to a third embodiment of the present invention.
9 is experimental data of the oil recovery tank according to the fourth embodiment of the present invention.
10 is experimental data of an oil recovery tank according to a fifth embodiment of the present invention.

Since the present invention can apply various transformations and can have various embodiments, specific embodiments are illustrated in the drawings and described in detail in the detailed description. However, this is not intended to limit the present invention to specific embodiments, and it should be understood to include all modifications, equivalents and substitutes included in the spirit and scope of the present invention. In describing the present invention, if it is determined that a detailed description of a related known technology may obscure the gist of the present invention, the detailed description thereof will be omitted.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. do.

1 is a view showing an oil recovery apparatus according to an embodiment of the present invention.

Referring to FIG. 1 , the oil recovery device includes an oil-water separation device and an oil recovery tank.

The oil recovery device is towed by a tugboat. In the towing process, oil, which is a source of water pollution, is introduced into the oil-water separation device together with water, and the oil separated from water in the oil-water separation device flows into an oil recovery tank and is recovered. A mechanism for the oil-water separation device to separate the water-oil mixture into water and oil is a known technique, and a description thereof will be omitted.

The oil recovery device may further include an oil fence. The oil fence is disposed in front of the oil-water separator to guide the direction of oil flowing into the oil-water separator from the front of the oil-water separator toward the oil-water separator to increase oil recovery efficiency.

The oil fence is interposed between the tugboat and the oil-water separation device, and the tug boat can tow the oil-water separation device through the oil fence.

The oil recovery tank includes an inlet. The inlet of the oil recovery tank is connected to the oil outlet of the oil-water separation device.

The oil recovery tank according to various embodiments of the present invention, which will be described below, has a deformed shape modified from the basic shape of a rectangular parallelepiped. In the embodiments of the present invention, the underwater drag applied to the oil recovery tank in the towing process of the oil recovery tank and the storage capacity for storing the recovered oil vary according to how much the oil recovery tank has a deformed shape from its basic shape.

2 is a view showing a basic form of an oil recovery tank according to various embodiments of the present invention. Referring to FIG. 2 , the basic shape of the oil recovery tank has a rectangular shape having lengths, widths, and heights of P, Q, and R, respectively. where 12D≤P≤18D, 2.5D≤Q≤5.5D, 1D≤R≤3D, and D is the hydraulic diameter of the inlet formed in the oil recovery tank.

For example, 0.15 meter ≤ D ≤ 0.30 meter. In this case, the basic shape of the oil recovery tank may have a length P of 1.8 meters or more and 5.4 meters or less, a width Q of 0.375 meters or more and 1.65 meters or less, and a height of 0.15 meters or more and 0.9 meters or less.

The specifications for the basic shape of the above oil recovery tank are given in consideration of the specifications of conventionally used tanks (for example, considering the case of being towed by small and medium-sized tugs, and a size that is easy enough for one or two people to handle). It was decided. And the hydraulic diameter of 0.15 meter ≤ D ≤ 0.30 meter was also determined in consideration of the inlet of the conventionally used tank.

FIG. 3 is a view showing an example of an oil recovery tank having a modified shape that is modified from the basic shape shown in FIG. 2 , FIG. 4 is a side view of the oil recovery tank shown in FIG. 3 , and FIG. 5 is FIG. It is a view from the top of the oil recovery tank shown in 3 .

The modified form of the oil recovery tank shown in FIGS. 3 to 5 is a deformation in which the front lower inclined surface (E ₁ ) inclined from front to rear is formed in the front lower part in the basic form shown in FIG. 2, the front side part from front to rear Deformation in which the inclined front side inclined surface (E ₂ ) is formed, the rear side inclined surface (E ₃ ) inclined from rear to front is formed on the rear side, and the rear lower inclined surface inclined from rear to front in the rear lower part (E ₄ ) has a deformed form in which all the formed deformations are made. The front side inclined surfaces E ₂ are respectively formed on the left and right sides of the basic shape of the oil recovery tank. And the rear side inclined surface (E ₃ ) is formed on the left and right sides of the basic shape of the oil recovery tank, respectively.

In this case, the angle (hereinafter, referred to as the front lower inclination angle) between the front lower inclined surface (E ₁ ) and the horizontal plane (ex. the plane parallel to the XY plane) is θ _f , and the front side inclined surface (E ₂ ) and the basic shape _{The tangent value (h f} /w _f ) of the angle (hereinafter referred to as the front side inclination angle) formed by the vertical plane (ex. the plane parallel to the XZ plane) parallel to the longitudinal direction (ex. X direction) is called _{AR f} , and the rear the tangent to the side inclined surface (E ₃₎ and the basic form (surface parallel with ex. XZ plane) longitudinal vertical plane parallel to the (ex. X-direction) of (also Dora below, rear side inclination angle), the angle (h _r / w _r ) is _{called AR r} , and the angle (hereinafter, the lower rear inclination angle) between the rear lower inclined surface (E ₄ ) and the horizontal plane (ex. the plane parallel to the XY plane) is θ _r , and the width of the rear end is S , and the height of the rear end is called L.

When the _{sizes of θ f} , AR _f , AR _r , θ _r , S, and L are changed, the underwater drag force and storage capacity of the oil recovery tank having the modified form shown in FIGS. 3 to 5 are changed. In other words, the underwater drag and storage capacity of the oil recovery tank having a deformed form from the basic form is a function using θ _f , AR _f , AR _r , θ _r , S and L as variables.

6 is experimental data of the oil recovery tank according to the first embodiment of the present invention.

Referring to FIG. 6 , the experiment according to this embodiment is a variable that affects the underwater drag and storage capacity of the oil recovery tank modified from the basic form as shown in FIG. 2 , θ _f , AR _f , AR _r , θr, S, This is an experiment to calculate the underwater drag and storage capacity of the oil recovery tank by using _{θ f in L as a variable and the rest as constants.}

In more detail, in the above experiment, _{assuming AR f} = 2, AR _r = 1.2, S = 0.8D, L = 2D, θ _r , = 0°, and using θ _f as a variable, the underwater drag and storage capacity of the oil recovery tank was calculated.

For reference, in FIG. 6 , the circular dot indicates the underwater drag coefficient (C _d ), and the square dot indicates the storage capacity. The underwater drag coefficient is a coefficient indicating the magnitude of the underwater drag. If the underwater drag coefficient of an object is large, the underwater drag force applied to the object is large, and if the underwater drag coefficient is small, the underwater drag force is small.

As a result of the experiment, in _{the range of θ f} between 6° and 24°, the underwater drag coefficient showed a tendency to decrease and then increase, and the storage capacity showed a tendency to increase steeply and then gradually increase. In particular, the underwater force coefficient tends to reach a minimum value around 18°.

Through this experimental result, it was confirmed that when 16.74° ≤ θ _f ≤ 19.77°, the oil recovery tank had a low underwater drag coefficient (C _d ≤ 0.23) ^{while maintaining a constant storage capacity (≥90D 3 ).}

Furthermore, the applicant of the present application also found that even when AR _f , AR _r, S, L, θ _r has a constant value other than 2, 1.2, 0.8D, 2D, and 0, respectively, when 16.74° ≤ θ _f ≤ 19.77°, oil recovery It was confirmed that the tank had a low coefficient of underwater drag (C _d ≤0.23) ^{while maintaining a constant storage capacity (≥90D 3 ).}

Therefore, the oil recovery tank according to the present embodiment is independent _{of AR f} , AR, S, L, θ _r When 16.74° ≤ θ _f ≤ 19.77°, it can have sufficient storage capacity (≥90D ³ ) and effectively low water drag (C _d ≤0.23). _{For reference, the underwater drag coefficient (C d} ) of a naval submarine (submersible), which requires low fluid resistance due to its operational characteristics, has a range of 0.2 or more and 0.3 or less.

7 is experimental data of the oil recovery tank according to the second embodiment of the present invention.

7, the above experiment, the influence of the variation of strain in the basic form in the water drag, and the storage capacity of the oil recovery reservoir parameters θ _f, AR _f, AR _r, θ _r, S, AR of L _f This is an experiment to calculate the underwater drag and storage capacity of the oil recovery tank by using as variables and the rest as constants.

In more detail, in the above experiment, it is _{assumed that AR r} = 1.2, S = 0.8D, L = 2D, θ _r , = 0°, θ _f = 12°, and with AR _f as a variable, the underwater drag and storage of the oil recovery tank The dose was calculated.

For reference, in FIG. 7 , the circular dot indicates the underwater drag coefficient (C _d ), and the square dot indicates the storage capacity.

As a result of the experiment _{, the underwater drag coefficient decreased in the range of AR f} between 0.5 and 3.0, and then increased again at 3.0, and the storage capacity showed a tendency to decrease.

Through this experimental result, it was confirmed that when 2.52 ≤ AR _f ≤ 3.37, the oil recovery tank had a low underwater drag (C _d ≤ 0.23) ^{while maintaining a constant storage capacity (≥90D 3 ).}

Furthermore, the present applicant stated that even when AR _r, S, L, θ _r , and θ _f have constant values other than 1.2, 0.8D, 2D, 0, and 12, respectively, when 2.52 ≤ AR _f ≤ 3.37, the oil recovery tank It was confirmed to have a low water drag (C _d ≤ 0.23) while maintaining a constant storage capacity (≥90D ^{3 ).}

Therefore, the oil recovery tank according to the present embodiment is independent _{of AR r,} S, L, θ _r , θ _{f .} When 2.52 ≤ AR _f ≤ 3.37, it can have sufficient storage capacity (≥90D ³ ) and effectively low water drag (C _d ≤0.23).

8 is experimental data of an oil recovery tank according to a third embodiment of the present invention.

8, the above experiment, the influence of the variation of strain in the basic form in the water drag, and the storage capacity of the oil recovery reservoir parameters θ _f, AR _f, AR _r, θ _r, S, of the L AR _r This is an experiment to calculate the underwater drag and storage capacity of the oil recovery tank by using as a variable and the rest as a constant.

In more detail, _{assuming AR f} = 2.0, S = 0.8D, L = 2D, θ _r , = 0°, θ _f = 12° in the _{above experiment, and using AR r} as a variable, the underwater drag and storage of the oil recovery tank The dose was calculated.

For reference, in FIG. 8 , the circular dot indicates the underwater drag coefficient (C _d ), and the square dot indicates the storage capacity.

As a result of the experiment, when AR _r was in the range of 0.5 or more and 3.0 or less, the underwater drag coefficient increased and then decreased, and the storage capacity showed a tendency to decrease.

From this experimental result, it can be confirmed that when 0 ≤ AR _r ≤ 0.63 or 1.67 ≤ AR _r ≤ 3.0, the oil recovery tank has a low underwater drag (C _d ≤0.23) ^{while maintaining a constant storage capacity (≥90D 3 ).} there was.

Furthermore, the applicant of the present application _{also found that 0 ≤ AR r} ≤ 0.63 or 1.67 ≤ AR _r ≤ 3.0 _{when AR f,} S, L, θ _r , and θ _f have constant values other than 2.0, 0.8D, 2D, 0, and 12, respectively. When , it was confirmed that the oil recovery tank has a low underwater drag (C _d ≤ 0.23) ^{while maintaining a constant storage capacity (≥90D 3 ).}

Therefore, the oil recovery tank according to the present embodiment is independent _{of AR f,} S, L, θ _r , θ _{f .} When 0 ≤ AR _r ≤ 0.63 or 1.67 ≤ AR _r ≤ 3.0, it can have sufficient storage capacity (≥90D ³ ) and effectively low drag in water (C _d ≤0.23).

9 is experimental data of the oil recovery tank according to the fourth embodiment of the present invention.

_{Referring to FIG. 9 , in the above experiment, S among θ f} , AR _f , AR _r , θ _r , S, and L, which are variables affecting the underwater drag and storage capacity of the oil recovery tank, were modified from the basic shape. This is an experiment to calculate the underwater drag and storage capacity of the oil recovery tank by using the rest as variables and constants.

In more detail, in the above experiment, it _{is assumed that AR f} = 2.0, AR _{r =} 1.2, L = 2D, θ _r , = 0°, θ _f = 12°, and with AR _r as a variable, the underwater drag and storage of the oil recovery tank. The dose was calculated.

For reference, in FIG. 9 , the circular dot indicates the underwater drag coefficient (C _d ), and the square dot indicates the storage capacity.

Experimental results, S In the range of 0 to 4.0D, the underwater drag coefficient decreased and then increased, and the storage capacity showed a tendency to increase.

1.12D ≤ S through this experimental result When ≤ 3.68D, it was confirmed that the oil recovery tank had a low underwater drag (C _d ≤ 0.23) ^{while maintaining a constant storage capacity (≥90D 3 ).}

Furthermore, the inventor of the present application has found that even when AR _f, AR _r, L, θ _r , and θ _f have constant values other than 2.0, 1.2, 2D, 0, and 12, respectively, 1.12D ≤ S When ≤ 3.68D, it was confirmed that the oil recovery tank had a low water drag (C _d ≤ 0.23) ^{while maintaining a constant storage capacity (≥90D 3 ).}

Therefore, the oil recovery tank according to the present embodiment is independent _{of AR f,} AR _r, L, θ _r , θ _{f .} 1.12D ≤ S When ≤ 3.68D, it can have sufficient storage capacity (≥90D ³ ) and effectively low water drag (C _d ≤0.23).

10 is experimental data of an oil recovery tank according to a fifth embodiment of the present invention.

Referring to FIG. 10 , in the above experiment, the modified form modified from the basic form was tested with θ _f , AR _f , AR _r , θ _{r among θ r} , S and L variables affecting the underwater drag and storage capacity of the oil recovery tank. This is an experiment to calculate the underwater drag and storage capacity of the oil recovery tank with , L as variables and the rest as constants.

In more detail, in the above experiment, AR _f = 3, AR _{r =} 3, S = 3D, θ _f = 18° were assumed, and θ _r , L were used as variables to calculate the underwater drag and storage capacity of the oil recovery tank.

For reference, in FIG. 10 , the circular dot indicates the underwater drag coefficient (C _d ), and the square dot indicates the storage capacity.

As a result of the experiment, when L = 0.08D, the _{underwater drag coefficient is less than 0.23 in the range of θ r} of 20 degrees or more and 35 degrees or less, but when θ _r is approximately less than 28 degrees, the storage capacity is ^{less than 90D 3} , and when L = 0.8D , when θ _r is 20 degrees or more and 35 degrees or less, the underwater drag coefficient is less than 0.23, but when θ _r is approximately less than 25 degrees, the storage capacity is ^{less than 90D 3} , and when L=1.0D, when θ _r is 20 degrees or more and 35 degrees In the following range, the underwater drag coefficient was less than 0.23 and the storage capacity was more than ^{90D 3 .}

Through this experimental result, 25° ≤ θ _r ≤ 30°, 0.8D ≤ L When ≤ 1.0D, it was confirmed that the oil recovery tank had a low underwater drag (C _d ≤ 0.23) ^{while maintaining a constant storage capacity (≥90D 3 ).}

Furthermore, the inventors of the present application _{have found that even when AR f} , AR _r , S and θ _f have constant values other than 3, 3, 3D, and 18, respectively, 25° ≤ θ _r ≤ 30°, 0.8D ≤ L When ≤ 1.0D, it was confirmed that the oil recovery tank had a low underwater drag (C _d ≤ 0.23) ^{while maintaining a constant storage capacity (≥90D 3 ).}

Therefore, the oil recovery tank according to the present embodiment is independent _{of AR f} , AR _r , S, θ _{f .} 25° ≤ θ _r ≤ 30°, 0.8D ≤ L When ≤ 1.0D, it can have sufficient storage capacity (≥90D ³ ) and effectively low water drag (C _d ≤0.23).

As a result of comprehensive review of the above experiments, 16.74° ≤ θ _f ≤ 19.77°, 2.52 ≤ AR _f ≤ 3.37, 0 ≤ AR _r ≤ 0.63, or 1.67 ≤ AR _r ≤ 3.0, and 1.12D ≤ S ≤ 3.68D, 25° ≤ θ _r ≤ 30°, 0.8D ≤ L When ≤ 1.0D, it can have sufficient storage capacity (≥90D ³ ) and effectively low water drag (C _d ≤0.23).

In the above, although embodiments of the present invention have been described, those of ordinary skill in the art can add, change, delete or add components within the scope that does not depart from the spirit of the present invention described in the claims. The present invention may be variously modified and changed by, etc., and this will also be included within the scope of the present invention.

1: tug boat
10: oil recovery device
100: oil-water separation device
200: oil recovery tank
300: oil fence

Claims (8)

An oil recovery tank having an inlet through which oil flows, comprising:
In the basic form of a rectangular parallelepiped, a deformation in which a front lower inclined surface inclined from front to rear is formed in the front lower part, a deformation in which a front side inclined surface inclined from front to rear is formed on the front side, a rear side inclined from rear to front on the rear side It has a modified form in which at least one of a deformation in which an inclined surface is formed, a deformation in which a rear lower inclined surface inclined from rear to front is formed in the lower rear portion,
The length, width, and height of the basic form are P, Q, and R, respectively,
Wherein P is 12D or more and 18D or less,
The Q is 2.5D or more and 5.5D or less,
Wherein R is 1D or more and 3D or less,
wherein D is the hydraulic diameter of the inlet. According to claim 1,
In the basic form, it has a deformed form in which a lower front inclined surface inclined from front to rear is formed in the lower front portion,
The angle between the front lower inclined surface and the horizontal plane is 16.74 degrees or more and 19.77 degrees or less, characterized in that the oil recovery tank. According to claim 1,
In the basic form, it has a deformed form in which a front side inclined surface inclined from front to rear is formed on the front side,
An oil recovery tank, characterized in that the tangent value of the angle between the front side inclined surface and the vertical surface parallel to the longitudinal direction of the basic shape is 2.52 or more and 3.37 or less. According to claim 1,
It has a modified form in which a rear side inclined surface inclined from rear to front is formed on the rear side in the basic form,
An oil recovery tank, characterized in that the tangent value of the angle between the rear side inclined surface and the vertical surface parallel to the longitudinal direction of the basic shape is 0 or more and 0.63 or less, or 1.67 or more and 3.0 or less. According to claim 1,
It has a modified form in which a rear side inclined surface inclined from rear to front is formed on the rear side in the basic form,
The width of the rear end of the modified form is 1.12D or more and 3.68D or less, the oil recovery tank. According to claim 1,
In the basic form, it has a modified form in which a lower rear inclined surface inclined from rear to front is formed in the lower rear portion,
The angle between the lower rear inclined surface and the horizontal plane is 25 degrees or more and 30 degrees or less,
The height of the rear end of the modified form is 0.8D or more and 1.0D or less, characterized in that the oil recovery tank. According to claim 1,
In the above basic form, a deformation in which a front lower inclined surface inclined from front to rear is formed in the front lower portion, a deformation in which a front side inclined surface inclined from front to rear is formed in the front side portion, a rear side inclined surface inclined from rear to front in the rear side portion It has a deformed form in which the deformation formed, the lower rear inclined surface inclined from the rear to the front is formed in the lower rear portion,
The angle between the front lower inclined surface and the horizontal plane is 16.74 degrees or more and 19.77 degrees or less,
The tangent value of the angle between the front side inclined surface and the vertical plane parallel to the longitudinal direction of the basic form is 2.52 or more and 3.37 or less,
The tangent value for the angle between the rear side inclined surface and the vertical plane parallel to the longitudinal direction of the basic form is 0 or more and 0.63 or less, or 1.67 or more and 3.0 or less,
The width of the rear end of the modified form is 1.12D or more and 3.68D or less,
The angle between the lower rear inclined surface and the horizontal plane is 25 degrees or more and 30 degrees or less,
The height of the rear end of the modified form is 0.8D or more and 1.0D or less, characterized in that the oil recovery tank. An oil-water separation device in which a water-oil mixture is introduced, and the mixture is separated into water and oil: and
8. An oil recovery device coupled to the oil-water separation device and comprising an oil recovery tank according to any one of claims 1 to 7 for recovering oil discharged from the oil-water separation device.

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