JP2003285792A - Unloading device and its system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an unloading device capable of easily preventing heat from entering a cold insulated solid-form, powder-form, or slurry-form cargo, without forming whole equipment on a large scale. <P>SOLUTION: In an unloading device applied on a ship having a hip hull frame and a cargo hold 4 forming a heat insulation space between a ship hull frame and the cargo hold and situated in the ship hull frame effecting cold insulation and storing a solid-form, a powder-form, or a slurry-form cargo NGH lower in a slurry medium content, the unloading device comprises a feeding means situated at the bottom of the cargo hold 4 and feeding a slurry medium SM to bring the cargo NGH, stored therein, into a slurry-form state; a cooling means connected to the feeding means and cooling the slurry medium SM; a discharging means situated at the bottom part of a cargo hold 4 and discharging the cargo NGH brought into a slurry-form state by feeding the slurry medium SM by using the feeding means; and a transfer means connected to the discharging means and transferring a slurry-form cargo NGH discharged from the cargo hold 4. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ship unloading device, and specifically, for example, from natural gas to NGH (Na
tural Gas Hydrate: relates to a floating body production facility for producing natural gas hydrate, and an unloading device provided on a hull such as a transport ship for transporting NGH. It should be noted that these floating body production facilities and transport ships are included in the concept of ships.

[0002]

2. Description of the Related Art A conventional unloading device applied to a ship that stores powder cargo in a cargo hold is disclosed in, for example, Japanese Patent Laid-Open No. 6-1.
As shown in Japanese Patent No. 44357, a horizontal conveyer and a vertical conveyer are used to carry out a powder cargo from the cargo hold or to carry a powder cargo into the cargo hold.

[0003]

However, when handling a powdered cargo that needs to be kept cold, the above-mentioned unloading device either covers the entire outer surface of the unloading device or keeps the entire unloading device cool so that heat does not enter. However, there is a problem that the unloading device becomes large.
In particular, when unloading solid, powder, or slurry NGH (natural gas hydrate) with a low slurry medium content, when heat enters the unloading device, NGH decomposes into natural gas and water. In some cases, an endothermic reaction occurs when NGH is decomposed, and the thawed water is solidified again and adheres to the above horizontal conveyor or the like to make it difficult to unload NGH. Therefore, it is necessary to take sufficient heat insulating measures such as horizontal conveyors.

The present invention has been made in view of the above problems and allows heat to enter a cold solid-state, powder-like, or slurry-like cargo without enlarging the entire facility. An object of the present invention is to provide a unloading device that can easily prevent the above.

[0005]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a heat insulating space between a hull frame and a hull frame, which is disposed inside the hull frame and has a solid state. In a unloading device applied to a ship having a cargo hold that cools and stores a cargo in the form of powder, powder, or slurry with a low content of slurry medium, the cargo that is stored in the bottom of the cargo hold. Supply means for supplying a slurry medium for making the slurry into a slurry state, a cooling means connected to the supply means for cooling the slurry medium, and provided at the bottom of the cargo hold, and supplying the slurry medium to the cargo hold using the supply means. The discharging means discharges the slurry-like cargo, and the transferring means is connected to the discharging means and transfers the slurry-like cargo discharged from the cargo hold.

According to this structure, since the slurry medium cooled by the cooling means can be supplied into the cargo hold, the cargo can be slurried while maintaining the temperature of the cargo in the cargo hold. Further, since the discharge means and the transfer means connected to the discharge means are provided at the bottom of the cargo hold, the slurry-like cargo can be easily discharged from the cargo hold.

Specifically, the above-mentioned supply means may further include a swirling nozzle at the outlet thereof. By attaching the swirl nozzle to the outlet of the supply means, the slurry medium discharged from the swirl nozzle is radially discharged.
As a result, the cargo in the cargo hold can be made into a substantially homogeneous slurry.

Further, the discharging means may be an eductor which sucks slurry-like cargo from the bottom of the cargo hold using the slurry medium as a driving medium. Since the eductor is substantially cylindrical and small, it is easy to keep it cool. Further, since the cooled cooling medium can be used as the driving medium similarly to the slurry medium supplied to the cargo hold, the cargo can be discharged while maintaining the temperature of the cargo.

Further, the above-mentioned transfer means may be a slurry pump for pumping a slurry-like cargo. By using the slurry pump, it is possible to easily transfer the slurry-like cargo even if the transfer destination is far.

Further, according to the present invention, a transfer passage, one side of which is connected to the outlet of the above-mentioned unloading device, and a slurry-like cargo, which is connected to the other side of the transfer passage and is transferred, between the slurry medium and the cargo. And a slurry storage device connected to the separation device for storing the separated cargo, and a slurry medium storage device connected to the separation device for storing the separated slurry medium. You may respectively connect the supply means and discharge means of an unloading device to a medium storage device.

According to this structure, since the separating device is provided, the slurry medium can be separated from the cargo transported in the form of slurry. Further, since the cargo storage device and the slurry medium storage device are connected to the separating device, the separated cargo and slurry medium can be stored in the respective storage devices. Furthermore, since the slurry medium storage device is connected to the supply means and the discharge means of the unloading device, the separated slurry medium can be supplied to the cargo hold and the eductor again. In addition,
From the viewpoint of maintaining the temperature of the transported cargo within a substantially constant temperature range, it is preferable that all of these devices be heat-insulated.

The transfer passage is mounted so as to surround the inner passage through which the slurry-like cargo flows, and forms a space between the inner passage and the inner passage so that the cooling gas can flow therein. An outer passage configured and a heat insulating member attached so as to cover the outer passage may be provided.

According to this structure, since the heat insulating member is attached so as to cover the outer passage, it is possible to prevent heat from entering the outer passage from the outside of the heat insulating member. further,
Since the outer passage is provided so as to surround the inner passage and the cooling gas is caused to flow in the space between the inner passage and the outer passage, the heat conducted from the heat insulating member to the slurry-like cargo in the inner passage is cooled by the cooling gas. Can absorb heat. As a result, even if the transfer passage is long, the temperature of the slurry-like cargo flowing therein can be sent to the transfer destination while maintaining the temperature within a predetermined temperature range.

Further, the present invention has a hull frame, and a cargo hold for forming a heat insulating space between the hull frame and the inside of the hull frame to cool and store powdery cargo. In an unloading device applied to a ship, an air slide type collecting means is provided at a concave bottom of a cargo hold, and collects powdery cargo stored in the cargo hold at a substantially central portion thereof by using cooled gas. A discharge means for discharging the collected cargo, which is connected to the substantially central portion of the bottom of the cargo hold, and a gas transfer means connected to the discharge means for transferring the discharged cargo by using the compressed and cooled gas. It is characterized by including.

According to this construction, the air slide type collecting means is provided at the bottom of the cargo hold, and the cooled gas is supplied to the collecting means, so that the powdery cargo in the cargo hold is removed from the cargo hold. It can be collected in the approximate center of the bottom. The collected powdery cargo is discharged using a discharge means provided at a substantially central portion of the bottom of the cargo hold, and is pressure-fed to a transfer destination using a gas transfer means connected to the discharge means. As the above gas, air, nitrogen gas, natural gas, or the like is used.

Specifically, the discharging means may be a rotary valve. After receiving the powdered cargo from the inlet of the rotary valve, the powdered cargo is sent to the outlet of the rotary valve by rotating the vanes (blades) inside the rotary valve. At this time, even if there is a pressure difference between the inlet and the outlet, the gas on the outlet side of the rotary valve is kept airtight so as not to flow back to the inlet side. Therefore, even if the pressure of the gas transfer means to which the rotary valve is connected is high, the powdery cargo can be sent to the outlet of the rotary valve.

The above-mentioned gas transfer means is connected to a compressor for pumping gas, an outlet side of the compressor, a cooler for cooling the compressed gas, and an outlet side of the cooler. It is also possible to provide a container for storing the compressed / cooled gas, and a first transfer passage which is connected to the outlet side of the container and transfers the powdery cargo as a gas by joining with the discharge means.

According to this structure, the gas fed under pressure from the compressor is cooled to a predetermined temperature by the cooler, passed through the container, and then fed into the transfer passage. Since the discharge means is joined with the transfer means, the powdery cargo discharged from the discharge means is transferred to the transfer destination together with the gas to be pumped. Here, the “predetermined temperature” is preferably equal to or lower than the temperature of the powdery cargo. Thereby, the powdery cargo can be gas-transferred while maintaining the temperature of the powdery cargo within a certain temperature range. The above gas is air,
Nitrogen gas or natural gas is used.

A storage for storing a powdery cargo that is gas-transferred by using a second transfer passage, one side of which is connected to an outlet of the first transfer passage of the above-mentioned unloading device, and a gas transfer means. It is also possible to provide a reflux passage for connecting with the device and connecting the storage device with the inlet of the compressor.

According to this structure, since the first transfer passage is connected to the storage device via the second transfer passage, the powdery cargo in the cargo hold is gas-transferred to the storage device together with the gas. The gas flowing into the storage device is separated from the powdery cargo, and only the powdery cargo is stored in the storage device. On the other hand, since the storage device and the compressor are connected by the return passage, the gas separated in the storage device can be returned to the inlet of the compressor via the return passage. It should be noted that these devices are desirably heat-insulated in order to transfer the powdery cargo, which is gas-transferred, to the storage device while maintaining the temperature of the powdered cargo in a substantially constant temperature range.

The above-mentioned second transfer passage is attached so as to surround the inner passage through which the powdery cargo flows, and forms a space between the inner passage and the inner passage, and the cooling gas is contained therein. An outer passage configured to allow flow and a heat insulating member attached so as to cover the outer passage may be provided.

According to this structure, since the heat insulating member is attached so as to cover the outer passage, it is possible to prevent heat from entering the outer passage from the outside of the heat insulating member. further,
Since the outer passage is provided so as to surround the inner passage and the cooling gas is flown in the space between the inner passage and the outer passage, the heat conducted from the heat insulating member to the powdery cargo in the inner passage is cooled. It can absorb heat by gas. As a result, even when the second transfer passage is long, the powdery cargo flowing therein can be sent to the transfer destination while maintaining the temperature of the powdery cargo within a predetermined temperature range.

The above-mentioned unloading device according to the present invention can be used for unloading natural gas hydrate (NGH).

Here, "NGH" is composed mainly of methane and water, its phase is powder or slurry, and the holding temperature for holding the form is -5 ° C to -15.
℃.

[0025]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to the attached drawings. FIG. 1 schematically shows the structure of a ship to which the unloading device according to the present invention is applied. A feature of this embodiment is that the unloading device includes a cooler 18 as shown in FIG.
This unloading device is for unloading cargo in a cargo hold arranged in the ship. Therefore, first, the cargo hold in the ship will be described.

FIG. 1A is a schematic side view of a ship to which the unloading device according to the present invention is applied. Figure 1
1B is a view taken along the line AA of FIG. For convenience of description, the upper side of FIG. 1 is referred to as the upper side.

As shown in FIG. 1 (a), the inside of the hull 1 is divided into a plurality of cargo compartments 3 by a horizontal bulkhead 2, and the cargo holds 4 are independently arranged in the cargo compartments 3, respectively. . The cargo hold 4 has a substantially box shape, and on its outer surface, ribs 5 having an inverted L-shaped cross section are equally arranged on the left and right sides to improve the cooling efficiency and reinforce the cargo hold 4. 5 is attached so as to surround the outer surface of the cargo hold 4.
A heat insulating member 6 is attached to the inner surface of the hull 1 so as to cover the three cargo holds 4 as a whole, and a heat insulating space 7 is provided between the heat insulating member 6 and the cargo hold 4 for each cargo compartment 3.
Are formed. In the present embodiment, the cargo section 3 is divided into three for convenience of description, but the number of sections of the cargo section 3 is not limited to three. Also,
As the heat insulating member 6, resin such as glass wool, rock wool or polyurethane is used.

In each heat insulating space 7, a supply passage 8 and a recirculation passage 9 for supplying and circulating a cooling gas for absorbing heat from the heat insulating space 7 are provided. The supply passage 8 and the return passage 9 are connected so as to traverse the heat insulating space 7 of each cargo compartment 3, and are arranged above and below the cargo hold 4 as shown in FIG. 1B. The supply passage 8 and the return passage 9 are connected to a refrigerator 10 installed in a compartment different from the cargo compartment 3 described above. Although one supply passage 8 and one return passage 9 are attached here, a plurality of supply passages 8 and return passages 9 may be attached. Air or nitrogen gas is used as the cooling gas.

According to the above construction, the heat insulating member 6 is attached to the inner surface of the hull 1 so as to collectively cover the three independently provided cargo holds 4 and thus the hull 1
The heat transferred from the side to the cargo hold 4 side can be prevented from entering the heat insulating space 7. On the other hand, the cooling gas flowing out from the refrigerator 10 flows through the supply passage 8 and is supplied to the heat insulating space 7 of each cargo compartment 3 from a plurality of outlets 8a provided in the supply passage 8 which will be described later. (A) and (b)
Flows along the outer surface of the cargo hold 4 as indicated by arrow G1. At this time, the cooling gas flowing on the outer surface of the cargo hold 4 absorbs the heat entering from the heat insulating member 6 and the like. Furthermore, the ribs 5 provided on the outer surface of the cargo hold 4 have a cooling fin effect,
The cooling gas cools the outer surface of the cargo hold 4 via the ribs 5.
As a result, natural gas hydrate NGH in the cargo hold 4
Can be maintained in a substantially constant temperature range. Then, the cooling gas that has absorbed the heat that has entered from the heat insulating member 6 and has cooled the outer surface of the cargo hold 4 flows into a plurality of suction ports 9a provided in the return passage 9 described below and returns to the refrigerator 10 for freezing. After being cooled by the machine 10, the supply passage 8 is again provided.
Is supplied to. In this way, the cooling gas circulates through the supply passage 8, the heat insulating space 7, and the return passage 9.

Further, the supply passage 8 and the return passage 9 inserted into the heat insulating space 7 will be described in detail. As shown in FIG. 1A, the supply and return passages 8 and 9 are arranged at substantially equal intervals along the flow direction of the cooling gas flowing therein, and as shown in FIG.
As shown in (b), a plurality of outlets 8a and a plurality of inlets 9a are attached so that the cooling gas flows out or flows in the left and right sides or the entire circumference. These outlets 8a and the inlets 9a may each be provided with a damper 8b for adjusting the flow rate of the cooling gas as shown in FIG. 1 (c), or as shown in FIG. 1 (d). of,
The outlet 8a provided with the damper 8b may be connected to one collecting passage 8c, and the collecting passage 8c and the supply passage 8 may be connected by the passage 8d in which the control valve 8e is interposed. However, it is not limited to these.
According to the above configuration, the cooling gas can be evenly flowed from the outlet 8a of the supply passage 8 to the entire heat insulating space 7,
It is also possible to adjust the flow rate of the cooling gas supplied from each outlet 8a to the heat insulating space 7. As a result, uneven flow of the cooling gas flowing in the heat insulating space 7 can be prevented, and the temperature of the cooling gas in the heat insulating space 7 can be maintained in a substantially constant temperature range. And natural gas hydrate NGH in the cargo hold 4
The temperature of can be maintained in a substantially constant temperature range.

As shown in FIG. 1 (a), a temperature measuring instrument TI may be attached to the return passage 9 and the temperature measuring instrument TI may be connected to a controller (not shown) in the refrigerator 10. . As a result, the temperature measuring device T attached to the return passage 9
The temperature of the cooling gas discharged from the heat insulating space 7 of each cargo compartment 3 is measured using I, and the temperature of the cooling gas supplied from the refrigerator 10 is changed based on the measurement result, or the supply flow rate of the cooling gas is changed. Can be changed. as a result,
The temperature of the cooling gas in the heat insulating space 7 can be maintained in a substantially constant temperature range, and the temperature of the natural gas hydrate NGH in the cargo hold 4 can be set in a substantially constant temperature range. Here, as an example, the temperature measuring device TI is attached to the return passage 9, but, for example, the temperature measuring device TI may be attached to each heat insulating space 7, the outer surface of the cargo hold 4, or the inside of the cargo hold 4. I do not care.

FIG. 2 is a system diagram of the unloading device according to the embodiment of the present invention. A cargo hold 4 is accommodated in the hull 1, and a natural gas hydrate NGH in a solid form, a powder form, or a slurry form having a low slurry medium content is housed in the cargo hold 4. A supply passage 101 for supplying the slurry medium SM for making the natural gas hydrate NGH into a slurry is connected to the bottom of the cargo hold 4, and a valve 14 for adjusting the supply amount of the slurry medium SM is interposed in the middle thereof. . The supply passage 101 extends through the bottom of the cargo hold 4 and extends inside the cargo hold 4, and a swirl nozzle 16 is provided at the end thereof. A discharge passage 104 for discharging the natural gas hydrate NGH in a slurry state is connected to the bottom of the bottom of the cargo hold 4, and a valve for adjusting the discharge amount of the natural gas hydrate NGH is provided in the middle of the discharge passage 104. 13 intervenes. At the bottom of the cargo hold 4, the eductor 1
1 is provided and connected to the discharge passage 104. Further, the eductor 11 has a supply passage 103 for supplying the slurry medium SM as a drive medium for sucking the slurry-like natural gas hydrate NGH from the discharge passage 104.
And a discharge passage 105 for discharging the mixture (NGH + SM) of the natural gas hydrate NGH and the slurry medium SM is connected. The discharge passage 105
Is connected to the suction port of the slurry pump 12. At the discharge port of the slurry pump 12, the mixture (NGH + S
A passage 106 for pumping M) is connected. A passage 109 for supplying a gas GAS such as natural gas or nitrogen gas is connected to the upper part of the cargo hold 4, and a valve 15 for adjusting the supply amount of the gas GAS is interposed in the middle thereof.

Coolers 18 are provided in the middle of the supply passages 101 and 103, respectively. here,
Although the cooler 18 is provided in the hull 1, if the same equipment is provided in the unloading equipment 50 described later, the hull 1
The cooler 18 may not be provided inside.

Further, a heat insulating member 6 is attached to the inner surface of the hull 1, and the heat insulating member 6 covers all the above-mentioned constituent members.

According to the above structure, the slurry medium SM pressure-fed from the slurry medium storage device 53 described later through the supply passage 101 is cooled by the cooler 18 in the hull 1 and then supplied to the swirling nozzle 16. To be done. The swirling nozzle 1
6 supplies the slurry medium SM to the natural gas hydrate NGH in the cargo hold 4 while swirling using the pressure of the slurry medium SM. As a result, the natural gas hydrate NGH in the cargo hold 4 is uniformly stirred and becomes a slurry. Agitated slurry-like natural gas hydrate N
The GH uses the eductor 11 to move from the cargo hold 4 to the discharge passage 10.
And the mixture (NGH +) together with the slurry medium SM that has been sucked in through and supplied to the eductor 11 as a driving medium.
It is discharged from the discharge passage 105 as SM). The discharged mixture (NGH + SM) is pressure-fed by the slurry pump 12 to the separating device 51 described later via the passages 106 and 106a.

Further, the hull 1 is connected to the facility 50 on the side for unloading the natural gas hydrate NGH stored in the cargo hold 4 via the passage 106a (S1 and S2 in FIG. 2). Here, a concrete structure of the passage 106a is shown in FIG. FIG. 3A is a cross-sectional view of the inside of the passage 106a as seen from the direction in which the mixture (NGH + SM) flows. The passage 106a is provided with a substantially tubular inner passage 106c, and a plate-shaped support member 106d is equally arranged on the outer peripheral surface of the inner passage 106c. The support member 10
6d is a mixture (NGH + S) as shown in FIG.
It is provided at a predetermined interval along the direction in which M) flows. A substantially tubular outer passage 106b mounted concentrically so as to surround the inner passage 106c is in contact with the radially outer end surface of the support member 106d. A heat insulating member 56 is provided around the outer peripheral surface of the outer passage. Note that the structure shown here is an example, and the present invention is not limited to this structure. As shown in FIG. 2B, the inner passage 10
The mixture (NGH + SM) flows in 6c, and the outer passage 10
Cooling gas CG flows in 6b. By providing the heat insulating member 56, the outer passage 106b is provided from the outside of the heat insulating member 56.
The heat entering the inside is reduced, and the heat conducted to the outer passage 106c through the heat insulating member 56 is further transferred to the outer passage 106c.
The cooling gas CG flowing inside absorbs heat. This allows
It is possible to prevent heat from entering the mixture (NGH + SM) flowing in the inner passage 106c.

The above-mentioned facility 50 for unloading the natural gas hydrate NGH comprises a separator 51 for separating the mixture (NGH + SM) into the slurry medium SM and the natural gas hydrate NGH. The separating device 51 includes a hull 1
The passage 106a from the side is connected. Further, the separation device 51 is connected to the cargo storage device 52 that stores the natural gas hydrate NGH separated via the passage 108, and also stores the slurry medium SM that stores the separated slurry medium SM via the passage 107. It is also connected to the device 53. The passage 1 is provided at the bottom of the slurry medium storage device 53.
Pumps 54 and 55 are connected via 00 and 102, respectively. These pumps 54, 55 are the eductor 1
1 and the cargo hold 4 are connected via supply passages 101 and 103, respectively. Furthermore, the separate storage 51, the cargo storage device 52, the slurry medium storage device 53, and the pump 5 described above.
4, 55 and the passages connecting these devices are surrounded by a heat shield 56.

According to this structure, the mixture (NGH + SM) sent under pressure to the separating device 51 by the slurry pump 12 in the hull 1 through the passages 106 and 106a is processed by the slurry medium SM and the natural gas hide in the separating device 51. Rate NG
It is separated into H and. Isolated natural gas hydrate N
The GH is stored in the cargo storage device 52, and the remaining slurry medium SM is stored in the slurry medium storage device 53. The slurry medium S stored in the slurry medium storage device 53
M is sucked into the pumps 54, 55, and pumps 54, 5
5 is discharged from the discharge side. The discharged slurry medium S
The M is cooled by the cooler 18 provided in the middle of the supply passages 101 and 103, and then sent to the cargo hold 4 and the eductor 11 under pressure. Thus, the slurry medium SM is
It is possible to circulate between the cargo hold 4 and the facility 50 on the side where the natural gas hydrate NGH is unloaded.

As described above, the natural gas hydrate NGH can be unloaded from the cargo hold 4 while preventing the natural gas hydrate NGH from being decomposed by heat input. Further, since the gas GAS can be supplied to the cargo hold 4 through the passage 109, it is possible to prevent the negative pressure in the cargo hold 4 by discharging the natural gas hydrate NGH from the cargo hold 4. You can also

Next, another modified example of the unloading device will be described. FIG. 4 shows a system diagram for another modification of the unloading device according to the present invention. It differs from the above-described embodiment of the unloading device only in the gas transfer of solid or powdered natural gas hydrate NGH.
Therefore, parts corresponding to the above-described embodiments of the unloading apparatus are designated by the same reference numerals, and detailed description thereof will be omitted.

A cargo hold 4 is stored in the hull 1, and a solid or powdered natural gas hydrate NGH is stored in the cargo hold 4. The bottom of the cargo hold 4 is concave, and air slide type collecting devices 20 are provided on both sides of the lowest part. A blower 23 that supplies a gas such as natural gas, air, or nitrogen gas, and a cooler 24 that cools the gas that is pumped from the discharge side of the blower 23 are connected to the collector 20 via a passage 208. There is. At the top of the cargo hold 4, there is a passage 206.
Is provided, and the passage 206 is connected to the suction side of the blower 23. As a result, the gas pressure-fed by the blower 23 is cooled by the cooler 24, and then the collecting device 2
0, the gas causes the natural gas hydrate NGH in the cargo hold 4 to flow, and the natural gas hydrate moves toward the lowest portion of the bottom recess in the cargo hold 4 as indicated by a broken line 209 in FIG. Move NGH. Further, the gas supplied to the collecting device 20 is the natural gas hydrate NGH.
The gas flows from the bottom to the top of the cargo hold 4, flows through the passage 206, is sucked into the blower 23, is pressurized by the blower 23, and is then supplied to the collecting device 20 again. By doing so, the natural gas hydrate NGH can be collected in the lowest portion of the concave portion of the cargo hold 4 without decomposing the natural gas hydrate NGH.

On the other hand, the discharge passage 205 is connected to the lowest portion of the concave portion of the cargo hold 4, and the valve 21 is interposed in the middle thereof. Further, in the hull 1, a compressor 22 and the compressor 22
25 connected to the discharge side of
And a container 26 connected to the cooler 25 via a passage 203. At the outlet side of the container 26, the transfer passage 2
04 is connected to the exhaust passage 205, and the solid or powder natural gas hydrate NGH discharged from the exhaust passage 205 can be transferred by gas. The gas used for gas transfer is natural gas, air, nitrogen gas, or the like. Also, the valve 2
1, a rotary valve is used so that the natural gas hydrate NGH can be discharged to the transfer passage 204 while preventing the gas to be transferred into the cargo hold 4 from flowing backward.

A heat insulating member 6 is attached to the inner surface of the hull 1 so as to cover the cargo hold 4, the valve 21, the container 26, etc. so that heat does not enter the cargo hold 4 from the side of the hull 1. .

The hull 1 is connected to the facility 50 on the side for unloading the natural gas hydrate NGH stored in the cargo hold 4 through the passage 204a (S1 and S2 in FIG. 4). Here, the concrete structure of the passage 204a is shown in FIG. FIG. 5A is a cross-sectional view of the inside of the passage 204a as seen from the direction in which the natural gas hydrate NGH flows. The passage 204a is provided with a substantially tubular inner passage 204c, and a plate-shaped support member 204d is equally arranged on the outer peripheral surface of the inner passage 204c. The support member 2
As shown in FIG. 5 (b), 04d are provided at predetermined intervals along the direction in which the natural gas hydrate NGH flows. On the radially outer end surface of the support member 204d,
A substantially tubular outer passage 204b, which is concentrically attached so as to surround the inner passage 204c, abuts. A heat insulating member 56 is provided around the outer peripheral surface of the outer passage.
Note that the structure shown here is an example, and the present invention is not limited to this structure. As shown in FIG. 5B, the inner passage 2
The natural gas hydrate NGH flows in 04c, and the cooling gas CG flows in the outer passage 204b. By providing the heat insulating member 56, the outer passage 2 is provided from the outside of the heat insulating member 56.
The heat that penetrates into 04b is reduced, and the heat insulating member 5
The heat conducted to the outer passage 204c via the outer passage 1
The cooling gas CG flowing in the inside of 06c absorbs heat. This can prevent heat from entering the natural gas hydrate NGH flowing in the inner passage 204c.

On the other hand, the equipment 50 on the side for unloading the natural gas hydrate NGH stored in the cargo hold 4 of the hull 1,
The cargo storage device 52 for storing the natural gas hydrate and the heat insulating member 56 for covering the cargo storage device 52 are provided. A transfer passage 204 is connected to an upper portion of the cargo storage device 52, and a natural gas hydrate NGH is provided in the cargo storage device 52.
Can be pumped with the gas. One end of the passage 201 is connected to the upper part of the cargo storage device 52, and the other end of the passage 201 is connected to the suction side of the compressor 22. With the above configuration, the natural gas hydrate NGH gas-transferred to the cargo storage device 52 through the transfer passage 204 and the gas are separated in the storage container 52, and the separated gas is returned to the compressor 22 again to be gas. It can be used as a transfer gas.

Further, in the upper part of the cargo hold 4, there is a gas GAS.
The passage 210 for supplying the gas is connected so that the internal pressure of the cargo hold 4 does not become a negative pressure by transferring the natural gas hydrate NGH in the cargo hold 4.

The cargo hold 4 in the hull 1 may be modified in design as shown in FIGS. 6 and 7.

FIG. 6 (a) is a schematic side view of another ship to which the unloading device according to the embodiment of the present invention is applied. FIG. 6B is a BB arrow view of FIG. 6A. The ship is different from the ship shown in FIG.
The heat insulating member 6 is brought into contact with the hull 1 side of the rib 5 attached to the outer surface of the heat insulating member 7 so that the heat insulating member 7 is divided to form the divided heat insulating space 7a. Therefore, parts corresponding to the ship shown in FIG. 1 are designated by the same reference numerals, and detailed description thereof will be omitted.

As shown in FIG. 6 (a), the hull 1 is divided into two cargo compartments 3, in which cargo holds 4 are independently arranged. On the outer surface of the cargo hold 4, ribs 5 having a substantially rectangular cross section are equally arranged in the left-right direction, and each rib 5 is attached to the outer surface of the cargo hold 4 so as to surround the outer surface. The heat insulating member 6 is in contact with the outer end surface side of these ribs 5. As a result, the heat insulating space 7 is divided into a plurality of divided heat insulating spaces 7a, and each of the divided heat insulating spaces 7a surrounds the entire outer surface of the cargo hold 4. This state is shown in Figure 6.
It shows in (b). As shown in the figure, a supply passage 8 and a return passage 9 for supplying a cooling gas are provided in the upper and lower central portions of the divided heat insulating space 7a. Corresponding to the heat insulation space 7a,
An outlet 8a and an inlet 9a for supplying / exhausting the cooling gas are provided respectively. These outlets 8a
The suction ports 9a are arranged so that the flow rates of the fluids flowing in the divided heat insulating spaces 7a on the left and right sides in FIG. 6B are substantially equal. The outlet 8a and the inlet 9a
The outlet 8a shown in FIG. 1 (c) or FIG. 1 (d).
The suction port 9a may be attached to adjust the flow rate of the cooling gas.

As shown in FIG. 1 (a), the supply passage 8 is connected so as to cross the heat insulating space 7 of each cargo compartment 3, and the return passage 9 is similarly connected to each cargo compartment 3. They are connected so as to cross the heat insulating space 7. Further, the supply passage 8 and the return passage 9 are connected to a refrigerator 10 arranged in a compartment different from the cargo compartment 3. Although one supply passage 8 and one return passage 9 are provided here, a plurality of supply passages 8 and return passages 9 may be provided.

According to this structure, the cooling gas flowing out from the outlet 8a of the supply passage 8 is divided into the left and right sides of the divided heat insulating space 7a as indicated by the arrow G1 in FIG. 6 (b),
After flowing through each of the divided adiabatic spaces 7a, it again flows into the suction port 9a. Then, the cooling gas is returned to the refrigerator 10 via the reflux passage 9, cooled again, and supplied to the supply passage 8. At this time, the cooling gas absorbs the heat that has entered the divided heat insulating space 7a from the heat insulating member 6, so that the heat that has entered does not transfer to the cargo hold 4. As a result, the natural gas hydrate NGH in the cargo hold 4 can be maintained in a substantially constant temperature range. Further, in the present embodiment, the heat insulating space 7 is divided into a plurality of divided heat insulating spaces 7a and the cooling gas is supplied into the divided heat insulating spaces 7a substantially evenly. It is possible to prevent variations in the entire temperature.

The ribs 5 can be used for cooling the cargo hold 4 and for reinforcing the cargo hold 4.

FIG. 7 is a schematic cross-sectional view of another ship to which the unloading device according to the embodiment of the present invention is applied. The ship is different from the ship shown in FIG.
Consists of an inner wall 4a of the cargo hold 4 and an outer wall 4b surrounding it, and a liquid refrigerant such as slurry ice-like brine is supplied to the heat insulation space 7, and the latent heat is used to enter the heat insulation space. Only the heat absorption is different. Therefore, parts corresponding to the ship shown in FIG. 1 are designated by the same reference numerals, and detailed description thereof will be omitted.

The cargo hold 4 housed in the hull 1 has an inner wall 4
It has a double shell structure composed of a and an outer wall 4b attached so as to surround the inner wall, and a heat insulating space 7 is formed between the inner wall 4a and the outer wall 4b of the cargo hold 4. The outer surface of the outer wall 4b is covered with the heat insulating member 6. Furthermore, a storage container T for storing the liquid refrigerant LB is provided above the heat insulating space 7, the storage container T and the outer wall 4b are connected by a refrigerant supply passage L, and the liquid refrigerant LB is supplied to the heat insulating space 7. Is configured to be able to. A valve V is provided in the middle of the refrigerant supply passage L, and the amount of the liquid refrigerant LB supplied can be adjusted. The liquid refrigerant L
As B, slurry ice-like brine or the like is used. When the heat input from the heat insulating member 6 is large,
A device (not shown) that circulates and replenishes the new liquid refrigerant LB may be provided.

According to this structure, the liquid refrigerant LB is supplied from the storage container T to the heat insulating space 7 to fill the entire heat insulating space 7, and the heat of the heat insulating member 6 is insulated by utilizing the latent heat of melting of the ice in the liquid refrigerant LB. The heat that enters the space 7 can be absorbed. As a result, the temperature of the natural gas hydrate NGH in the cargo hold 4 can be maintained within a substantially constant temperature range.

[0056]

EFFECTS OF THE INVENTION The unloading apparatus according to the present invention can keep a solid state, a powder state,
Alternatively, heat can easily be prevented from entering the slurry-like cargo.

[Brief description of drawings]

FIG. 1 is a side view and a sectional view of a ship to which an unloading device according to an embodiment of the present invention is applied.

FIG. 2 is a system diagram of an unloading device according to an embodiment of the present invention.

FIG. 3 is a cross-sectional view of a passage that connects a ship with equipment on the unloading side according to the embodiment of the present invention.

FIG. 4 is a system diagram for another modification of the unloading device according to the embodiment of the present invention.

FIG. 5 is a cross-sectional view of a passage that connects a ship with equipment on the unloading side according to the embodiment of the present invention.

FIG. 6 is a side view and a sectional view of another ship to which the unloading device according to the embodiment of the present invention is applied.

FIG. 7 is a sectional view of another ship to which the unloading device according to the embodiment of the present invention is applied.

[Explanation of symbols]

1 hull 4 cargo hold 6 Heat insulating member 7 insulation space 11 eductors 12 pumps 16 swirl nozzle 18 Cooler 20 means of collection 21 valve 22 compressor 23 Blower 24 Cooler 25 cooler 51 Separation device 52 Cargo storage equipment 53 Slurry medium storage container 54 pumps NGH Natural Gas Hydrate

─────────────────────────────────────────────────── ─── Continued Front Page (51) Int.Cl. ⁷ Identification Code FI Theme Coat (Reference) B65G 53/20 B65G 53/20 53/30 53/30 A 67/60 67/60 B B67D 5/68 B67D 5/68 A // F17C 11/00 F17C 11/00 BF Term (reference) 3E072 EA10 3E083 BB11 3F047 CA03 3F077 AA05 AA06 BA02 BA05 BA06 DB09 EA29

Claims (12)

[Claims] 1. A solid-state, powder-like, or slurry-like cargo having a low slurry medium content, which is disposed inside the hull frame by forming an insulating space between the hull frame and the hull frame. In a unloading device applied to a ship having a cargo hold for keeping cold and storing, a supply means for supplying the slurry medium, which is provided at a bottom of the cargo hold, and connected to the supplying means, for cooling the slurry medium. Cooling means, discharge means provided at the bottom of the cargo hold for discharging the cargo in slurry form by supplying the slurry medium to the cargo hold using the supply means, and connected to the discharge means And a transfer device for transferring the slurry-like cargo discharged from the cargo hold. 2. The unloading device according to claim 1, wherein the supply means further comprises a swirling nozzle at its outlet,
An unloading device, characterized in that the cargo in the cargo hold is made into a substantially homogeneous slurry. 3. The unloading device according to claim 1, wherein the discharging means is an eductor that sucks the slurry-like cargo from the bottom of the cargo hold by using the slurry medium as a driving medium. 4. The unloading device according to claim 1, wherein the transfer means is a slurry pump for pumping the slurry-like cargo. 5. The unloading device according to claim 1, a transfer passage having one side connected to an outlet of the unloading device, and a transfer passage connected to the other side of the transfer passage. A separation device for separating the cargo in slurry form into the slurry medium and the cargo, a cargo storage device connected to the separation device for storing the separated cargo, and a separation device connected to the separation device A unloading system, comprising: a slurry medium storage device for storing a slurry medium; and a supply means and a discharge means of the unloading device respectively connected to the slurry medium storage device. 6. The unloading system according to claim 5, wherein the transfer passage is mounted so as to surround an inner passage through which the slurry-like cargo flows, and a space is provided between the inner passage and the inner passage. An unloading system comprising: an outer passageway formed and configured to allow a cooling gas to flow therein; and a heat insulating member attached to cover the outer passageway. 7. The present invention is applied to a ship having a hull frame and a cargo hold which forms a heat-insulating space between the hull frame and is arranged inside the hull frame to cool and store powdery cargo. In the unloading device, the air slide type collecting means is provided in the concave bottom portion of the cargo hold, and collects the powdery cargo stored in the cargo hold at the substantially central portion thereof by using cooled gas, Discharging means for discharging the collected cargo, which is connected to a substantially central portion of the bottom of the cargo hold, and is connected to the discharging means for transferring the discharged cargo using compressed and cooled gas A unloading device comprising a gas transfer means. 8. The unloading device according to claim 7, wherein the discharging means is a rotary valve. 9. The unloading apparatus according to claim 7, wherein the gas transfer means includes a compressor for feeding gas under pressure, a cooler connected to an outlet side of the compressor for cooling the compressed gas, A container connected to the outlet side of the cooler for accumulating the compressed / cooled gas, and a first transfer connected to the outlet side of the container for transferring the powdery cargo as a gas by joining the discharge means. An unloading device including a passage. 10. The unloading device according to claim 7, a second transfer passage whose one side is connected to an outlet of the first transfer passage of the unloading device, and a second transfer passage of the second transfer passage. A storage device connected to the other side for storing the powdery cargo transferred using the gas transfer means; and a reflux passage connecting the storage device and the inlet of the compressor. An unloading system characterized by. 11. The unloading system according to claim 10, wherein the second transfer passage is provided between an inner passage through which the cargo in powder form flows and is attached so as to surround the inner passage, and the inner passage. An unloading system comprising: an outer passage configured to allow a cooling gas to flow therein, and a heat insulating member attached so as to cover the outer passage. 12. The unloading device according to any one of claims 1 to 11, wherein the cargo stored in the cargo hold is natural gas hydrate.