JP2007106141A - Structure, fuel oil tank, vessel, and marine structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To miniaturize a heating device by avoiding a heat radiation loss due to the heating of a fuel oil of unnecessarily large capacity and preclude denaturation of the cargo in transit with heat as the greater part of oil in a storage tank remains unheated. <P>SOLUTION: A small division 20 is partitioned inside a fuel oil storage tank 5 in a hull 1, and only inside the small division, the heating device 10 is installed. The facade wall 5a as the oil storage tank 5 serves also as the backmost wall of a ship hold 7, but the forefront wall of the small division 20 is positioned apart backward from the ahead wall 5a of the storage tank 5, so that fuel oil with the temperature remaining not raised in a large division 23 exists in the area with respect to the hold 7. Accordingly even if the fuel oil is heated in the small division 20 to a temperature to suit transportation, no phenomenon is generated such that the heated fuel oil makes convection in the whole area of the storage tank 5, and only the temperature of the fuel oil existing in the small division 20 will rise. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a structure, for example, a fuel oil tank, which is provided with a heating means for heating and holding a built-in fuel oil so that the fuel oil can be entered and removed, and is particularly used in a marine structure and in particular a marine vessel propulsion device. The present invention relates to a fuel oil that needs to be heated for transfer.

  Under the Maritime Pollution Control Convention (MARPOL Convention), in order to prevent fuel oil, a marine pollutant, from flowing into the ocean in the event of damage to the hull due to a collision, the fuel oil storage tank is removed from the outer surface of the hull. It was newly stipulated that it should be installed in a section more than a certain distance away. According to this regulation, it is believed that fuel oil storage tanks will be placed around the cargo hold.

  By the way, the fuel oil used in a ship generally needs to be heated for transfer. Therefore, usually, a steam heating device is disposed in the fuel oil tank to heat the fuel oil. Such a steam heating apparatus has a heating capability that reaches locally, for example, up to about 150 degrees. The fuel oil is heated to cause natural convection of the fuel oil in the fuel oil tank.

  As a result, the fuel oil becomes hot above the fuel oil tank, and the bottom side remains at a low temperature, or the temperature rises slightly. In addition, the suction pipe for transferring the fuel oil is generally arranged at the bottom of the fuel oil tank. However, when the temperature of the fuel oil is secured near the bottom of the tank at a temperature suitable for the transfer, the temperature tends to be too high at the top. is there.

  On the other hand, as described above, the fuel oil storage tank comes into contact with the cargo hold. In such an arrangement, the heat is transferred to the transport cargo due to the above-described overheating of the fuel oil in the upper part of the fuel oil tank. As a result, the temperature of the transported cargo rises, and the risk of occurrence of defects such as alteration due to heat increases.

  For example, it demonstrates using FIG. 1 which is a conceptual sectional drawing which shows the normal tank arrangement | positioning in the ship hull for cargo transportation, and FIG. 2 which is the same side sectional drawing.

  In the illustrated hull 1, the outer surface is constructed by an upper deck 2, a ship side skin 3, and a ship bottom skin 4. In the hull 1, a pair of fuel oil storage tanks 5 is constructed between the front end wall 6 a of the engine room 6 and the cargo hold 7. As is apparent from the figure, the front wall 5 a of the fuel oil storage tank 5 is also the rear end wall of the cargo hold 7. The bottom 5b of the fuel oil storage tank 5 is constructed at the same height as the third (3rd) deck 6b of the engine room 6. Further, a coffer dam 8 is provided between the side wall 5 c of the fuel oil storage tank 5 and the ship side skin 3.

  In such a structure, a pair of heating devices 10 are provided on the bottom 5b side of the fuel oil storage tank 5, and a suction pipe 11 for transferring fuel oil is provided on the bottom. Reference numeral 12 denotes a heating tube, and 13 denotes a heating coil. Therefore, the rise in the temperature of the fuel oil due to heating causes the convection phenomenon of the fuel oil in the entire fuel oil storage tank 5, the fuel oil heated by the heating device 10 rises, and the temperature at the upper part of the fuel oil storage tank 5 The fuel oil that has fallen drops. In other words, due to the convection in the fuel oil storage tank 5, a temperature difference occurs between the upper part and the lower part in the fuel oil storage tank 5. A coffer dam 8 is also provided between the bottom 5b of the fuel oil storage tank 5 and the engine room 6 positioned below the bottom 5b.

  When the temperature is adjusted to the optimum temperature at the piping port 11a of the transfer suction pipe 11, the temperature of the upper portion of the fuel oil storage tank 5 without the stirring device rises, and the fuel oil whose temperature has increased is the fuel oil storage tank 5 Heat is transferred to the cargo through the front wall 5a of the cargo, that is, the rear wall of the cargo hold 7, and the temperature of the cargo is increased.

  In view of this, the present invention provides a structure such as a fuel oil tank of a ship, in which a fuel oil heating section is held in a small compartment in the fuel oil tank, and a large compartment portion where heat conduction of the fuel oil hardly occurs between the cargo holds. By doing so, the above-described problems are to be solved.

  In order to achieve the above object, the structure according to claim 1 of the present invention includes a fuel oil that can be input and output in a built-in manner, and a heating means that heats the built-in fuel oil. A small compartment including the heating means is defined in the body.

  According to the second aspect of the present invention, in the structure according to the first aspect, the heating means is provided only in the small section.

  According to the third aspect of the present invention, in the structure according to the first or second aspect, the ceiling surface of the small section does not have an opening.

  According to a fourth aspect of the present invention, the structure according to any one of the first to third aspects further includes a temperature adjusting means capable of adjusting a temperature in the small section.

  That is, the structure according to claims 3 and 4 is characterized in that the heated fuel oil is prevented from increasing the temperature of the fuel oil existing in the large compartment outside the small compartment by convection.

  The structure according to claim 5 is characterized in that, in the structure according to any one of claims 1 to 4, the side surface of the small section has an opening for inflow of fuel oil from outside the small section.

  That is, in the structure according to claim 5, for example, heated fuel oil in a small section is transferred to a settling tank by a transfer pump, and unheated fuel oil corresponding to the transfer amount has high viscosity but is provided on the side surface. It is characterized by allowing a structure that naturally flows into a small compartment at a slower flow rate than a large opening.

  According to the sixth aspect of the present invention, in the structure according to any one of the first to fifth aspects, low boiling point volatile gas generated from fuel oil during heating is applied to the small section at the intersection of the small section and the ceiling surface. It is characterized by providing a hole for discharging to the outside.

  The structure according to claim 7 is characterized in that, in the structure according to any one of claims 1 to 6, the small section is arranged at the lowermost part.

  In order to achieve the above object, a marine fuel oil tank according to claim 8 of the present invention is characterized by using the structure according to any one of claims 1 to 7.

  The fuel oil tank according to claim 9 is the fuel oil tank according to claim 8, wherein the small section is arranged so as not to contact the cargo hold. That is, fuel oil that is not directly heated exists between the cargo hold and the cargo hold.

  A ship according to claim 10 of the present invention includes the fuel oil tank according to claim 8 or 9.

  The marine structure according to claim 11 of the present invention, and the fuel oil tank according to claim 8 or 9 are provided.

  The present invention can reduce the size of the heating device by avoiding heat dissipation loss due to heating of an unnecessary large volume of fuel oil. Further, for example, when used as a tank of a ship, it is possible to prevent transportation cargo from being deteriorated by heat in order to realize safe transportation which is the main purpose of cargo transportation.

  An embodiment of a tank arrangement according to the present invention will be described with reference to the drawings. In the following description, the same or similar parts as those in the preceding example shown in FIGS.

  FIG. 3 is a conceptual cross-sectional view (A) and a side cross-sectional view (B) showing an embodiment of a hull provided with a fuel oil storage tank according to the present invention.

  The hull 1 of this embodiment has the same structure as that shown in FIGS. 1 and 2 as shown, and is constructed by the upper deck 2, the ship side skin 3, and the ship bottom skin 4. A pair of fuel oil storage tanks 5 is constructed between the front end wall 6a of the engine room 6 and the cargo hold 7, but a small compartment 20 is defined inside each fuel oil storage tank 5, The fuel oil storage tank 5 is separated from the large compartment 23 which is another part by the side wall 21 and the ceiling wall 22.

  The heating device 10 is provided only in the small section 20. Although a pair is provided in the illustrated example, the present invention is not limited to this. The configuration of the heating device 10 is substantially the same as that shown in FIGS. 1 and 2 and includes a suction pipe 11 for transferring fuel oil, a heating pipe 12 and the like. The side wall 21 of the small section 20 is provided with a plurality of openings 24 for allowing the fuel oil to naturally flow from the large section 23. Further, although detailed illustration is omitted, the low boiling point volatile gas generated from the fuel oil when the fuel oil is heated in the small section 20 is structurally provided at the intersection of the side wall 21 and the ceiling wall 22 of the small section 20. It leads out to the large section 23 through the scallop hole 25.

  Also in this embodiment, the front wall 5a as the fuel oil storage tank 5 is also the rear end wall of the cargo hold 7, but the front end wall of the small section 20 is separated rearward from the front wall 5a of the fuel oil storage tank 5, Between the cargo hold 7, there is a large section 23, that is, fuel oil that has not been heated. For this reason, even if the fuel oil is heated to a temperature suitable for transfer in the small section 20, an event in which the heated fuel oil convects in the entire fuel oil storage tank 5 does not occur and exists in the small section 20. Only the fuel oil is heated.

  In addition, it is preferable to equip the heating device 10 in the small section 20 with an automatic temperature control function in order to avoid an excessive temperature rise so that a constant temperature is always maintained.

  A tank constructed by a combination of large and small compartments can prevent environmental pollution due to unnecessary heating as described above, and is convenient for uses other than fuel oil heating for ships and the like. That is, as long as it is a structure that has a built-in fuel oil so that it can enter and exit and has a heating means that heats the built-in fuel oil, it is not limited to a ship as in the illustrated example, but other offshore structures and land It can also be used in other structures.

Conceptual cross-sectional view showing normal tank arrangement in cargo hull Cross-sectional side view The conceptual sectional view (A) which shows one example of the hull provided with the fuel oil storage tank concerning the present invention, and the side sectional view (B)

Explanation of symbols

1: Hull 2: Upper deck 3: Ship side skin 4: Ship bottom skin 5: Fuel oil storage tank 5a: Front wall 5b: Bottom 5c: Side wall 6: Engine room 6a: Front end wall 6b: Third deck of engine room 7: Cargo hold 8: Cofferdam 10: Heating device 11: Suction piping 11a for fuel oil transfer 11a: Piping port of suction piping 11 12: Heating tube 13: Heating coil 20: Small section 21: Side wall 22: Ceiling wall 23: Large section 24 : Opening 25: Scallop hole

Claims (11)

In a structure including a heating means for heating and holding the built-in fuel oil so as to be able to enter and leave the fuel oil, a small compartment including the heating means is defined in the structure. Characteristic structure. 2. The structure according to claim 1, wherein the heating means is provided only in the small section. The structure according to claim 1 or 2, wherein the ceiling surface of the small section does not have an opening. 4. The structure according to claim 1, further comprising temperature adjusting means capable of adjusting a temperature in the small section. 5. The structure according to claim 1, further comprising an opening for inflow of fuel oil from outside the small section on a side surface of the small section. 6. The structure according to claim 1, wherein a hole for discharging low boiling point volatile gas generated from fuel oil during heating to the outside of the small section is provided at an intersection between the small section and the ceiling surface. A structure characterized by comprising The structure according to any one of claims 1 to 6, wherein the small section is disposed at a lowermost part. A fuel oil tank comprising the structure according to any one of claims 1 to 7. 9. The fuel oil tank according to claim 8, wherein the small section is arranged so as not to contact the cargo hold. A ship comprising the fuel oil tank according to claim 8 or 9. A marine structure comprising the fuel oil tank according to claim 8 or 9.