TWI649254B - Fuel oil transfer device - Google Patents

Abstract

[Problem] To provide a fuel oil transfer device capable of preventing a decrease in the suction efficiency of the fuel oil in the storage portion by using the bell mouth even if the amount of fuel oil stored in the storage portion is reduced even if the amount is reduced. [Technical Content] A fuel oil transfer device includes a fuel oil storage tank (2) provided at a position that can receive heat from the atmosphere, and a fuel oil sucked from the fuel oil storage tank (2) to heat the fuel oil. The fuel oil separation tank used for heating the fuel oil in the fuel oil storage tank (2) can circulate the fuel oil, and the fuel oil storage tank (2) is provided with a bell mouth (opening toward the bottom) ( 2B) suction tube (2C), and a recess (30) formed on the bottom (2T) facing the opening of the bell mouth (2B) to allow the bell mouth (2B) to enter, and the recess (30) is a corresponding bell mouth The set number of (2B) is formed at the bottom (2T).

Description

Fuel oil transfer device

[0001] The present invention relates to a fuel oil transfer device. More specifically, the present invention relates to a fuel oil storage tank used to store fuel oil supplied to an internal combustion engine or the like.

[0002] Fuel oil used by a ship's main engine and auxiliary machinery is stored in a storage unit such as a tank, and is supplied to, for example, an internal combustion engine used as a main engine and consumed. As the fuel oil in the storage section, for example, a low-cost C heavy oil is used. Fuel oils have different viscosities according to temperature changes. The difference in viscosity will affect the fuel oil transfer efficiency. For example, when the viscosity is high, the flow resistance increases, the fuel oil moves difficult, and the transfer efficiency decreases.此 Here, a method of suppressing deterioration of the transfer efficiency of the fuel oil by increasing the temperature of the fuel oil in the tank to decrease the viscosity has been proposed (for example, Patent Document 1).的 The fuel oil stored in the tank used as the storage unit is taken out through a suction pipe having a bell mouth as an opening, and is supplied to heat for improving viscosity. On the other hand, the heated fuel oil flows into the tank from the opening of the bell mouth and is mixed with the stored fuel oil. As a result, the fuel oil in the tank, especially the fuel oil near the opening, is maintained at a temperature at which the transfer efficiency does not decrease. [0003] However, although the suction pipe inserted into the tank faces the bottom of the tank facing the bell mouth, for example, the remaining amount of fuel oil in the tank may become difficult to suck. That is, the bottom of the tank is mostly a flat shape, and if the fuel oil diffuses and stays in the flat area, it may be difficult to concentrate the fuel oil at a position facing the bell mouth. As a result, even if the fuel oil is sucked in when the fuel oil remains in the tank, there is a possibility that the fuel oil sucking efficiency may decrease. [Prior Art Document] [Patent Document] [0004] [Patent Document 1] Japanese Patent Laid-Open No. 2015-010600

[Problems to be Solved by the Present Invention] [0005] An object of the present invention is to provide a fuel oil that can be stored in a storage portion and can be reliably sucked in through a bell mouth to prevent the fuel oil from being sucked in the storage portion. Falling fuel oil transfer device. [Means for Solving the Problem] 0006 [0006] In order to solve the problem, the fuel oil transfer device of the present invention includes a fuel oil storage tank barrel provided at a position that can be exposed to the heat of the atmosphere, and a fuel oil storage tank is provided therefrom. The tank is heated by the sucked fuel oil, and the heated fuel oil separation tank that can be used for the fuel oil in the fuel oil storage tank can circulate the fuel oil. The fuel oil storage tank is provided with: The suction pipe of the bell mouth opening toward the bottom, and a concave portion formed at the bottom facing the opening of the bell mouth to allow the bell mouth to enter, the concave portion is formed on the bottom portion corresponding to the number of the bell mouths provided. [Effects of the Invention] [0007] According to the present invention, by concentrating the fuel oil in the storage portion into the recessed portion, the fuel oil attracted through the bell mouth can be secured. As a result, it is possible to prevent a decrease in the suction efficiency of the fuel oil from the storage portion.

[0009] Hereinafter, embodiments for carrying out the present invention will be described. Fig. 1 shows the configuration of a fuel oil transfer device 1 according to an embodiment for carrying out the present invention. (1) The fuel oil transfer device 1 includes a fuel oil separation tank 3 and a fuel oil common tank 4 that communicate with the fuel oil storage tank 2. The fuel oil separation tank 3 is a tank used to heat the fuel oil, and the fuel oil is heated to a temperature of 70 to 80 ° C. by a heater (not shown). [0010] The fuel oil storage tank bucket 2 and the fuel oil separation tank bucket 3 are communicated via a transfer pipe 5. In the middle, a transfer pump 6, a temperature sensor 7, and a pressure sensor 8 are arranged. The temperature sensor 7 is used, for example, to perform ON / OFF control and temperature setting of a heater provided in the fuel oil separation tank 3 in response to a temperature measurement result of the fuel charge port side of the transfer pump 6. . The pressure sensor 8 is provided to monitor the pressure change of the fuel oil sucked into the transfer pump 6. The pressure change is used to determine a change in flow resistance corresponding to a change in the viscosity of the fuel oil. In particular, when the viscosity increases and the flow resistance increases, the pressure on the inlet side of the transfer pump 6 tends to become vacuum. Therefore, if a pressure change in the vacuum tendency is detected, heating for reducing the viscosity of the fuel oil becomes necessary.燃料 The fuel oil separation tank barrel 3 is provided with a liquid level sensor 9 for detecting the liquid level of the fuel oil sucked by the transfer pump 6. The liquid level sensor 9 is a sensor capable of detecting a liquid level when a predetermined amount of fuel oil is introduced into the fuel oil separation tank 3. The liquid level sensor 9 is used to stop the driving of the transfer pump 6 when a predetermined amount of fuel oil is introduced into the fuel oil separation tank 3. [0011] The common fuel tank 4 is a fuel tank that is used to supply fuel oil to the internal combustion engine to temporarily store the fuel oil after being heated and purify it. The fuel oil storage tank bucket 2 and the fuel oil common tank bucket 4 are communicated through a suction pipe 10, and a flow-down pump 11 is arranged in the middle. A part of the fuel oil stored in the fuel oil common tank 4 is caused to flow down the fuel oil storage tank 2 by the down pump 11 to raise the temperature of the fuel oil in the fuel oil storage tank 2. The reason for the name of the down-flow pump 11 in this case is the premise of a configuration in which the fuel oil common tank 4 is disposed at a higher position than the fuel oil storage tank 2. That is, it is because the fuel oil is spouted from the fuel tank 4 which is a higher level to the fuel tank 2 which is lower than the lower level, and appears to flow down. [0012] In the configuration shown in FIG. 1, a configuration is adopted in which the fuel oil separation tank 3 and the fuel oil common tank 4 communicate with the suction pipe 10, respectively. Therefore, a fuel oil flow path in each of the tanks 3 and 4 is set so that the fuel oil flow path from the tanks 3 and 4 or any of the tanks to the fuel oil storage tank 2 is set. The outlet flow path is provided with a valve 12. [0013] The above fuel oil transfer device 1 heats the fuel oil sucked from the fuel oil storage tank bucket 2 toward the fuel oil separation tank bucket 3 by the transfer pump 6, and the heated fuel oil is purified and purified. The fuel oil common tank 4 is introduced, and a circulation path for supplying the stored fuel oil to the internal combustion engine is determined. A part of the fuel oil temporarily stored in the fuel oil common tank 4 is returned to the fuel oil storage tank 2 by a down pump 11. As a result, the fuel oil in the fuel oil storage tank 2 is partially heated to 36 to 40 ° C. by being mixed with the heated fuel oil. [0014] In this embodiment, the heating time until the fuel oil sucked into the fuel oil separation tank 3 by the transfer pump 6 reaches a predetermined temperature is considered. The running time of the flow-down pump 11 is about 45 minutes. The transfer pump The operation time of 6 is about 15 minutes, and the pumps are operated interactively. The operation time of the transfer pump 6 during this time is equivalent to the time until the liquid level of the fuel oil is detected by the liquid level sensor 9 in the fuel oil separation tank 3 described above. That is, the amount of fuel oil introduced based on the number of revolutions of the transfer pump 6 and the driving current within a specified operating time is the amount of rise in the liquid level corresponding to the operation of the liquid level sensor 9. Therefore, when the transfer pump 6 is operated while the time until the liquid level sensor 9 is activated is increased, it can be determined that the viscosity of the fuel oil flowing through the transfer pump 6 is high and the flow resistance is increased. When the liquid level sensor 9 is activated, the transfer pump 6 is stopped and the fuel oil is prevented from overflowing into the fuel oil separation tank 3. In addition, when no fuel oil is consumed during parking, the operating time of the transfer pump 6 is shortened, and the time until the liquid level sensor 9 operates is, for example, about 6 minutes. [0015] The path for drawing fuel oil from the fuel oil storage tank barrel 2 toward the fuel oil separation tank barrel 3 using the transfer pump 6 is shown by symbols F1 to F5 in FIG. 1. The flow path of the fuel oil from the fuel oil tank 4 to the fuel oil storage tank 2 using the down pump 11 is shown by arrows F10 to F12 in FIG. 1. (2) The fuel oil transfer device 1 using such a configuration has been disclosed in the previous application of the present applicant, which is Japanese Patent Application Laid-Open No. 2012-17123. [0016] A feature of the fuel oil transfer device 1 of the present embodiment having the above configuration is the structure of the fuel oil storage tank 2. That is, the fuel oil storage tank barrel 2 is characterized by a point having a concave portion at a bottom portion facing an opening of a bell mouth used for suction and discharge of fuel oil. In particular, when the bottom of the fuel oil storage tank barrel 2 is an inclined surface, the recessed portion is characterized by being provided at least at the lowest position of the surface. [0017] Before describing the above features, the fuel oil storage tank barrel 2 used in the fuel oil transfer device 1 of this embodiment will be described. The fuel oil transfer device 1 of this embodiment is, for example, as shown in FIG. 2, a top tank having a lower stern portion of the upper deck 101 provided on the ship 100 on the waterline and used as fuel oil. Storage tank barrel 2.顶 The fuel oil storage tank 2 used as the top tank is placed higher than the waterline WL. The cross-sectional shape is triangular and the depth in the vertical direction is different. [0018] On the other hand, the fuel oil transfer device 1 of this embodiment is provided with a box-shaped plot 20 for heating a part of the fuel stored in the fuel oil storage tank barrel 2 as a target. This box-shaped plot 20 is provided so that the transfer efficiency of the fuel oil sucked from the fuel oil storage tank bucket 2 toward the fuel oil separation tank bucket 3 does not decrease. (3) FIG. 3 is a diagram for explaining the principle structure of the box plot 20. The heated fuel oil returned to the fuel oil storage tank barrel 2 has a smaller specific gravity than the stored fuel oil, and is liable to rise and spread, but is prevented by stopping the heated fuel oil in the box plot 20 diffusion. As a result, the fuel oil retained in the position sucked in from the fuel oil storage tank 2 is maintained in a state where the temperature drop is suppressed and the flow resistance does not increase, so the transfer efficiency does not deteriorate. [0019] In FIG. 3, the fuel oil storage tank bucket 2 is a suction main pipe 2C including a suction pipe communicating with a bell mouth 2B having an opening toward the bottom. The inhalation main 2C is covered by a box-shaped plot 20. The box-shaped plot 20 has a cut-in portion 20A that cuts either side of the partition space upward from the bottom surface side, and uses the cut-in portion 20A to communicate the inside of the fuel oil storage tank barrel 2 and the inside of the box-shaped plot 20. [0020] The box-shaped plot 20 prevents the heated fuel oil from returning from the bell mouth 2B to the fuel oil storage tank 2 to rise from the position of the bell mouth 2B and flow toward a distant position. That is, if the fuel oil that has exited the bell mouth 2B rises, it will collide with the top plate 20B of the box-shaped plot 20 and return. As a result, the fuel oil causes turbulence in the box-shaped plot 20 and stops inside the box-shaped plot 20. [0021] On the other hand, a configuration for concentrating the flow of the heated fuel oil around the bell mouth 2B is a configuration in which a barrier 21 having a T-shaped cross section is arranged near the cut-in portion 20A. (2) In addition to the top plate 20B of the box plot 20, the heated fuel oil also collides with the horizontal sheet 21A of the barrier 21 to become turbulent flow, thereby improving the miscibility with the fuel oil in the box plot 20. As a result, the mixing ratio of the fuel oil sucked into the bell mouth 2B and the fuel oil after heating is improved, and the heating efficiency of the fuel oil is improved. [0022] The fuel oil storage tank bucket 2 forming the top side tank bucket shown in FIG. 2 is provided with a box facing the inclined bottom 2T of the triangular cross section of the drive body as shown in FIG. 4.状 区段 20。 The district 20.符号 In the same figure, the symbol 2A0 indicates the existing structural parts of the drive body used to form the box plot 20, that is, the skeleton for segmentation. The symbol 2A1 indicates the hole for the passage. The symbol 2D is an air extraction hole for extracting air trapped in the box-shaped plot 20. When the fuel oil after heating enters the box plot 20, the air remaining inside the plot 20 is pushed out to allow the inflow of the fuel oil that has been heated to flow in. [0023] Next, a characteristic portion of an embodiment of the present invention will be described. In FIGS. 3 and 4, the cross-sectional shape of the box-shaped plot 20 is the deepest position in the vertical direction in the triangular shape, in other words, at the bottom facing the bell mouth 2B opened at the bottom 2T at the lowest position. In 2T, a recessed portion 30 into which the bell mouth 2B can enter is provided. As shown in FIGS. 2 and 4, the recessed portion 30 forms a space that bulges from the bottom 2T of the fuel oil storage tank barrel 2 toward the lower portion, and makes it easy for fuel oil in the fuel oil storage tank barrel 2 to stay. The recessed portions 30 may be provided in accordance with the number of the bell mouths 2B. Although only the lowest position is shown in FIG. 4, the bell mouths 2B may be provided at a plurality of positions other than the lowest position where fuel oil can flow in. The bell mouth 2B is provided corresponding to each recessed portion 30. A factor that determines the number of the recesses 30 to be provided is the inclination angle of the bottom 2T of the fuel oil storage tank barrel 2. That is, if the bottom area is wide and the inclination angle is relatively small, the amount of fuel oil flowing into the lowest position becomes smaller. Here, in order to ensure the recovery of the fuel oil, it is effective to provide the recessed portion 30 at a position other than the lowest position of the bottom. [0024] The fuel oil in the fuel oil storage tank barrel 2 is introduced into the recessed portion 30 along the inclined bottom and is liable to stay. As a result, since the fuel oil easily faces the bell mouth 2B and is easily attracted, the suction efficiency does not decrease. In particular, the bottom of the fuel oil storage tank barrel 2 with the existing structure can secure the suction position of the fuel oil by a simple operation including only the additional recessed portion 30. Therefore, when the inclination angle θ of the bottom of the fuel oil storage tank barrel 2 shown in FIG. 4 is small, the fuel oil to be sucked in can be secured from the position facing the bell mouth 2B. [0025] Although the above description is directed to the top side tank barrel provided above the waterline, the present invention is not limited thereto, and the fuel oil storage tank barrel provided below the waterline is used as the object. Objects are also available. In addition, although the above description is directed to the configuration in which the bell mouth is arranged in the box-shaped community plan, the present invention does not provide the box-shaped community plan, and may only target a configuration in which the bell mouth is provided. [Industrial Applicability] [0026] Since the present invention is provided with a recess in the bottom of the fuel oil storage tank barrel, which can easily secure the fuel oil, the suction efficiency generated by the bell mouth does not decrease, so Said to be highly available.

[0027]

WL‧‧‧Waterline

1‧‧‧ fuel oil transfer device

2‧‧‧ fuel oil storage tank barrel

2A0‧‧‧Section skeleton

2A1‧‧‧via hole

2B‧‧‧flare

2C‧‧‧ Inhaler

2D‧‧‧Air extraction hole

2T‧‧‧ bottom

3‧‧‧ fuel oil separation tank

4‧‧‧Fuel oil tanks

5‧‧‧ transfer tube

6‧‧‧ transfer pump

7‧‧‧ temperature sensor

8‧‧‧ Pressure Sensor

9‧‧‧ level sensor

10‧‧‧ Suction tube

11‧‧‧ flow down pump

12‧‧‧ Valve

20‧‧‧ Community Planning

20A‧‧‧cut-in department

20B‧‧‧Top plate

21‧‧‧ barrier

21A‧‧‧Horizontal

30‧‧‧ recess

100‧‧‧ Ship

101‧‧‧ Upper deck

[0008] [FIG. 1] A schematic diagram showing a configuration of a fuel oil transfer device according to an embodiment of the present invention. [Fig. 2] A schematic diagram illustrating a hull for a place where a fuel oil storage tank of the fuel oil transfer device shown in Fig. 1 is installed. [Fig. 3] A diagram for explaining the principle structure of a box-shaped plot used in a fuel oil storage tank barrel of the fuel oil transfer device shown in Fig. 1. [FIG. 4] A perspective view illustrating a configuration portion of a fuel oil storage tank barrel installed at an installation place as shown in FIG.

Claims (4)

A fuel oil transfer device includes a fuel oil storage tank barrel provided at a location that can be exposed to the heat of the atmosphere, and a fuel oil sucked from the fuel oil storage tank barrel to be heated and used in the fuel oil storage tank barrel The heated fuel oil separation tank barrel of the fuel oil inside can circulate the fuel oil, and the fuel oil storage tank barrel is provided with a suction pipe communicating with a bell mouth opening near the bottom of the drive body provided with the fuel oil tank, And a recess formed facing the opening of the bell mouth and bulging from the bottom of the driving body toward the lower part, and the bell mouth can enter, the recess is formed on the bottom corresponding to the number of the bell mouths. For example, the fuel oil transfer device according to the first patent application range, wherein the recess is formed at least on the bottom of the lowest position if the bottom is inclined. For example, the fuel oil transfer device according to item 1 or 2 of the patent application range, wherein the fuel oil storage tank barrel having the bottom portion formed with the aforementioned recessed portion is a top tank barrel provided above the waterline. For example, the fuel oil transfer device according to item 1 or 2 of the patent application range, wherein the fuel oil storage tank barrel having a bottom portion with the aforementioned recessed portion is a fuel oil storage tank barrel disposed below the waterline.