JP2003170891A - Cargo handling device for hydrate transporting ship - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cargo handling device for a hydrate transporting ship capable of reducing heat quantity caused by the change of state of natural gas and reducing boil-off or the like. <P>SOLUTION: This cargo handling device 21 for a hydrate transporting ship is a device for handling cargo natural gas with the natural gas kept in a pellet type condition. The cargo handling device 21 arranged on the hydrate ship 1 is provided with a lateral conveyer 23 taking out pellet type natural gas in an inner tank 11, a vaporizer 29 pressurizing the gas to a prescribed pressure by taking out and heating a part of the pellet type natural gas, a pressure tank 31 storing the pressurized gas from the vaporizer 29 and an unloading post 33 transporting the pellet type natural gas taken out from the inner tank 11 by the lateral conveyer 23 by the pressurized gas supplied from the pressure tank 31. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to loading pelletized natural gas from a hydrate storage tank of a hydrate manufacturing berth into a hydrate transport ship, or hydrate storage of the hydrate storage berth from the hydrate transport ship. The present invention relates to a cargo handling device for a hydrate transport ship that can be unloaded to a tank.

[0002]

2. Description of the Related Art Conventionally, in the case of transporting natural gas containing methane as a main component, the natural gas is transported by a pipeline as it is (first conventional technique), or LNG (Liquefied Natural) at cryogenic temperature and pressure. Gas; liquefied natural gas) to a low temperature of, for example, minus 162 [° C.], and, for example, 0.
What was liquefied by pressurizing at a pressure of 025 [MPa] was transported by an LNG ship (second conventional technique). In such a first conventional technique, there is a limit in the transportation distance,
In addition, since the second conventional technology has a high equipment cost, there are many problems such as economical efficiency is not achieved unless it is a large gas field capable of producing gas for a long time. In recent years, natural gas is converted into a gas hydrate and efficiently stored, Research is being done to try to transport it.

FIGS. 6 and 7 are views for explaining an outline of a natural gas hydrated storage or transportation system which is a third conventional technique, and FIG. 6 is a methane hydrate in a methane hydrate production berth. It is a figure for explaining a manufacturing method and cargo, and Drawing 7 is a figure for explaining a methane hydrate regasification method and unloading in a hydrate storage berth.

In the methane hydrate production berth shown in FIG. 3, a gas well 103 is drilled in an underground gas field 101 such as the sea bottom. Natural gas is taken out from the gas field 101 by this gas well 103 and is put in a gas holder 105. Store. The natural gas stored in the gas holder 105 is in the state of 7.8 [MPa] at 10 [° C]. The natural gas in the gas holder 105 is taken into the hydrate manufacturing machine 107 together with the low temperature fresh water W, and in the hydrate manufacturing machine 107, for example, the temperature is 1 to 3 [° C] and the pressure is 0.3 to 3 [MPa]. After being made into a slurry-like natural gas, it is stored in the slurry storage tank 109 whose temperature and pressure are controlled.

In the process of producing hydrate in the hydrate producing machine 107, natural gas, low temperature fresh water, and additives such as amine, ether, or ketone are used as auxiliary materials, so that the hydrate has high temperature or low pressure. In, the slurry becomes natural gas in a stable state, and the control of temperature and pressure is eased. The slurry-like natural gas stored in the slurry storage tank 109 is pressure-fed from the transfer pump 111 and can be supplied to the hydrate transport ship 121 via the hose 113.

As shown in FIG. 3, the hydrate transport ship 121 includes a plurality of heat insulating tanks 123, 123, ... And the heat insulating tanks 123, 1 covered with a heat insulating material.
.. are provided with heat medium tubes 125, 125 ,. Further, protectors 127, 127, ... Are provided inside the heat medium tubes 125, 125 ,. further,
The heat insulating tanks 123, 123 are connected to each other by a stretch pipe 129. Further, the heat transfer tubes 125, 125, ... Of the heat insulation tanks 123, 123, ... Of the hydrate transport ship 121.
Is supplied with a heat medium from a heat source device (not shown).

After the hydrate transport ship 121 is docked at the methane hydrate production berth shown in FIG. 3, the transfer pump 111 provided at the outlet of the slurry storage tank 109 is installed.
And the extension pipe 129 of the hydrate transportation ship 121 are connected by the hose 113. Then, by operating the transfer pump 111, the natural gas in a slurry state in the slurry storage tank 109 is transferred to the transfer pump 111 and the hose 11.
3. It is sent to the heat insulating tanks 123, 123 through the extension pipe 129 of the hydrate transport ship 121. The slurry-like natural gas sent to the heat insulating tanks 123, 123 is stabilized at a temperature of, for example, minus 15 [° C.] and a pressure of, for example, 0.025 [MPa] to be pelletized. I am trying.

The pelletized natural gas is supplied to the heat insulating tank 123,
The hydrate transport ship 121, which is fully loaded with 123, ..., transports pelletized natural gas to a hydrate storage berth at a destination by, for example, cruising several tens of days. The hydrate transport ship 121 arriving at the destination, as shown in FIG.
The thermal insulation tanks 123,
Transfer pump 1 provided at the outlet of the take-out pipe 131 of 123, ...
The hose 143 connects the discharge port 33 and the gas holder 141 of the hydrate storage berth.

Further, in the hydrate transport ship 121, hot gas is supplied from the heat source device to the heat insulating tanks 123, 123, ...
, The pelletized natural gas is changed to a slurry-like natural gas. After that, by operating the transfer pump 133 in the hydrate transport ship 121, the heat insulating tank 12
The slurry-like natural gas in 3, 123, ... Was sent to the gas holder 141 via the transfer pump 133 and the hose 143.

[0010]

According to the above-mentioned first prior art, since the natural gas is transferred by the pipeline as it is, there is a possibility that the pipeline may be clogged in an environment such as a cold region. . According to the above-mentioned second conventional technique, since it is transported by an LNG carrier, a cryogenic facility is required for converting natural gas into liquefied natural gas, and a cryogenic transport ship and a cryogenic storage facility are required. In addition to the necessity, the equipment cost becomes huge, and since the cargo is loaded and sailed in the state of liquefied natural gas, there is a drawback that the liquefied natural gas may be boiled off due to the relationship of pressure and temperature.

According to the above-mentioned third conventional technique, there has been proposed a method for converting natural gas into a gas hydrate and then transporting it, but the natural gas is slurried from a gas state and further pelletized to be transported. And at the end of transportation,
Due to storage, cargo handling, and transportation conditions, such as the use of slurried natural gas again in the gas state at the time of consumption, a large amount of heat is required for frequent changes in the state of natural gas. The amount (the amount that evaporates and disappears) is large, and there is a disadvantage that a high-pressure heat insulating tank is required. The present invention has been made in view of the above-mentioned points, and reduces the amount of heat associated with a change in the state of natural gas,
Moreover, it is an object of the present invention to provide a cargo handling device for a hydrate transport ship, which is intended to reduce boil-off and the like.

[0012]

In order to achieve the above-mentioned object, a cargo handling device for a hydrate transport ship according to the invention of claim 1 is a hydrate storage in which the pellet-shaped natural gas is kept as it is from an inner tank of the hydrate ship. A cargo handling device on a hydrate transport ship that can load and unload pellet storage tanks in a berth.A horizontal conveyor that takes out the pelletized natural gas in the inner tank and a part of the pelletized natural gas that is heated and pressurized to a predetermined pressure. A vaporizer for converting the gas into a gas, a pressure tank for storing the pressurized gas from the vaporizer, and a pressurized gas and / or a pressurized gas supplied from the pressure tank to the pelletized natural gas taken out from the inner tank by the horizontal conveyor. It is characterized in that it is provided with an unloading post that conveys and guides by pressurized air or pressurized inert gas. A cargo handling device for a hydrate transport ship according to a second aspect of the present invention is the cargo handling device according to the first aspect, which conveys the pellets taken out from the horizontal conveyor to the bottom of the unloading post, or the pellets taken out from the horizontal conveyor. It is characterized in that a shooter for guiding to the bottom of the unloading post is provided. A cargo handling device for a hydrate transport ship according to a third aspect of the present invention is the cargo handling device according to the first aspect, wherein pellet-shaped natural gas in contact with an inner periphery of the unloading post is melted on the outer periphery of the unloading post to move the pellet-shaped natural gas. In order to facilitate the heating, a trace tube for heating is provided. The cargo handling device for a hydrate transport ship according to a fourth aspect of the present invention is the cargo handling device according to the first aspect, wherein an unloading hose supported by an unloading arm can be attached to a terminal of the unloading post. The pelletized natural gas pressure-fed by the unloading hose from the inner tank of the hydrate transport ship via the unloading post is guided to the hydrate storage tank of the hydrate storage berth.

In order to achieve the above-mentioned object, a cargo handling device for a hydrate transport ship according to a fifth aspect of the present invention is used as a hydrate transport ship in the form of pelletized natural gas from a hydrate storage tank on a hydrate manufacturing berth. A cargo handling device on a hydrate manufacturing berth for cargo handling, a conveying means for taking out pelletized natural gas from a hydrate storage tank in the hydrate manufacturing berth, and a pressure tank for taking out and storing a part of the gaseous natural gas from the gas tank. And a loading post that conveys and guides the pelletized natural gas taken out from the inside of the hydrate storage tank by the conveying means with the pressurized gas and / or the pressurized air or the pressurized inert gas supplied from the pressure tank. , Supported by a loading arm provided on the hydrate manufacturing berth, A loading hose connected to a loading post, wherein the loading hose guides the pelletized natural gas pressure-fed from the hydrate storage tank via the loading post to the inner tank of the hydrate transport ship. To do.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. [First Embodiment] FIGS. 1 to 3 are views for explaining a cargo handling device for a hydrate transport ship according to a first embodiment of the present invention. FIG. The figure for demonstrating the state loaded from the hydrate storage tank of the hydrate manufacturing berth to the hydrate transport ship, and FIG.
It is a figure for explaining the state of unloading from the hydrate transportation ship to the hydrate storage tank of the hydrate storage berth.

(Description of Structure of Hydrate Transport Ship) In these FIGS. 1 and 2, the hydrate transport ship 1
Has a hull constituted by a skin 3 and a double skin. The double skin 5 includes a tank 7 on the ship side and the tank 7 on the ship side.
Of the heat insulating material 9, an inner tank 11 having a hopper-shaped bottom portion provided inside the heat insulating material 9, a heat medium pipe 13 provided on an inner peripheral surface of the inner tank 11, and the heat medium. The protector 15 is provided inside the tube 13 on the inner side of the tank and protects the heat medium tube 13 from external force. The upper deck 12 is provided with a carry-in port 5a,
Moreover, a heat insulating lid 5b for closing the carry-in port 5a is provided.

(Explanation of the cargo handling device provided inside the hydrate transport ship 1) The cargo handling device 21 provided inside the hydrate transport ship 1 uses the pelletized natural gas inside the inner tank 11 as an inner tank. A horizontal conveyer 23 taken out from the bottom of 11 and a screw conveyer for guiding the pelletized natural gas taken out by the horizontal conveyor 23 to a hopper 25 via a rotary feeder 28 and carrying the pelletized natural gas introduced by the hopper 25. 27, a vaporizer 29 for extracting a part of the pelletized natural gas from the hopper 25 to heat it to a pressurized gas of a predetermined pressure, a pressure tank 31 for storing the pressurized gas from the vaporizer 29, and Inner tank 11
And a unloading post 33 for guiding the pelletized natural gas taken out from the inside by the horizontal conveyor 23, the hopper 25, and the screw conveyor 27 by the pressurized gas supplied from the pressure tank 31. In addition, in the cargo handling device 21, the hopper 25 and the screw conveyor 27 constitute a conveying means.

A trace pipe 35 is provided on the outer circumference of the unloading post 33 for heating the pellet natural gas in contact with the inner circumference of the unloading post 33 so as to melt the pellet natural gas and facilitate the movement of the pellet natural gas. It is provided. Further, the unloading post 3
As shown in FIG. 2, the unloading hose 3 supported by the unloading arm 37 is attached to the terminal 33 a of the No. 3 terminal 33 a.
9 can be mounted, and the pellet-shaped natural gas pressure-fed by the unloading hose 39 from the inner tank 11 of the hydrate transport ship 1 through the lateral conveyor 23, the hopper 25, and the unloading post 33 is hydrated. It can be led to the pellet storage tank 41 of the rate storage berth.

FIG. 3 is an enlarged view of a part of the cargo handling device mounted on the hydrate transport ship. In FIG. 3, at the bottom of the inner tank 11, a horizontal conveyor 23 and a shield rotary feeder 28 for sending out the pellet-shaped natural gas stored in the inner tank 11 toward the hopper 25, and the pellet-shaped natural gas. And a rotary feeder 43 for taking out a part of it and sending it to the vaporizer 29. The horizontal conveyor (shield rotary feeder) 23 can feed the pelletized natural gas to the screw conveyor 27 via the hopper 25. The screw conveyor 27 can feed pelletized natural gas to the bottom of the unloading post 33.

The rotary feeder 43 can take out a part of the pelletized natural gas and supply it to the vaporizer 29. In the vaporizer 29, for example, a hot gas HG of an ammonia refrigerant is supplied from a heat source device (not shown).
It can be supplied by circulating a and HGb. The gas discharge port of the vaporizer 29 communicates with the pressure tank 31, and the pressurized gas can be supplied from the vaporizer 29 to the pressure tank 31. The pressure tank 31 stores a pressurized gas having a predetermined pressure. The pressure tank 31 unloads the pressurized gas from the post 3
The pellet-shaped natural gas which is supplied to the bottom of No. 3 and fed by the screw conveyor 27 can be raised in the unloading post 33.

(Description of the hydrate manufacturing process in the hydrate manufacturing berth). In the hydrate manufacturing berth, hydrate manufacturing is performed as follows.
That is, as shown in FIG. 1, natural gas is stored in a gas tank 55 after being excavated from a gas field 51 underground such as the seabed by a gas well 53. The natural gas in the gas tank 55 is stored at a predetermined temperature of, for example, 1 [MPa] or less.

The natural gas in the gas tank 55 has a temperature of, for example, 2 [° C.] and a pressure of, for example, 0.025 [MPa].
It is supplied to the hydrate manufacturing machine 57 together with the fresh water W. The hydrate manufacturing machine 57 uses the supplied natural gas and fresh water W and has a temperature of, for example, -15.
After the pelletized natural gas having a temperature of [° C.] or less and a pressure of 0.025 [MPa], for example, the hydrate storage tank 59.
To send to.

Here, in the hydrate production process in the hydrate manufacturing machine 57, by using natural gas, low temperature fresh water W, and an additive such as an additive amine, ether or ketone, the temperature of the hydrate is high. At low pressures, it becomes stable pelletized natural gas, and temperature and pressure control is relaxed. The pelletized natural gas stored in the hydrate storage tank 59 is cooled to a temperature of, for example, minus 15 [° C.] and is kept at a pressure of, for example, 0.025 [MPa] for stabilization. ing.

(Explanation of the cargo handling device provided on the hydrate manufacturing berth) The cargo handling device 61 for a hydrate transport ship provided on this hydrate manufacturing berth is the hydrate storage tank 59 in the hydrate manufacturing berth.
Inside of the hydrate storage tank 59 by a conveying means 63 consisting of a hopper and a screw conveyor for taking out the pelletized natural gas from the pressure tank, a pressure tank 65 for taking out and storing a part of the gaseous natural gas from the gas tank 55, and the conveying means 63. The pellet-shaped natural gas taken out from the container is supported by a loading post 67 which is carried and guided by the pressurized gas supplied from the pressure tank 65 and a loading arm 69 provided on the hydrate manufacturing berth, and The loading hose 71 connected to the terminal 67a is provided, and the tip of the loading hose 71 is connected to the loading port 5 of the hydrate transport ship 1.
Pelletized natural gas that has been inserted into a and pressure-fed from the hydrate storage tank 59 via the loading post 67 can be carried into the inner tank 11 of the hydrate transport ship 1.

(Explanation of Operation of Cargo in Hydrate Manufacturing Berth) As shown in FIG. 1, natural gas is stored in a gas tank 55 after being excavated from a gas field 51 underground such as the seabed by a gas well 53. This gas tank 55
The natural gas therein is supplied to the hydrate manufacturing machine 57 together with fresh water W having a temperature of, for example, 2 [° C.] and a pressure of, for example, 0.025 [MPa]. This hydrate making machine 57
Is made into pellet-like natural gas using the natural gas and the fresh water W, and then sent to the hydrate storage tank 59.

The natural gas stored in the hydrate storage tank 59 is pelletized by being kept at a constant temperature and pressure as described above. Also,
The pellet-shaped natural gas stored in the hydrate storage tank 59 in this manner is sent to the bottom of the loading post 67 by the transfer means 63. Further, the pelletized natural gas sent to the bottom of the loading post 67 rises inside the loading post 67 by the pressurized gas supplied from the pressure tank 65, and is loaded onto the hydrate transport ship 1 via the loading hose 71. Deck 12
Is fed into the inner tank 11 through the carry-in port 5a. When the inner tank 11 is filled with pelletized natural gas, the carry-in port 5a of the upper deck 12 is closed by the heat insulating lid 5b.

Another double skin of the hydrate transport ship 1
When 5 is also filled with pelletized natural gas, preparations for departure are complete. In the inside of the inner tank 11, the temperature is, for example, minus 15 [° C.] by circulating the refrigerant supplied from a heat source device (not shown) through the heat medium pipe 13.
The pressure is maintained below and the pressure is, for example, 0.025 [MP
By keeping it in a], the pelletized natural gas can be transported as it is.

When the voyage for a predetermined number of days is completed,
The hydrate transport ship 1 is moored in a hydrate storage berth. Further, after the hydrate transport ship 1 is moored, the unloading post 33 as shown in FIG.
One end of an unloading hose 39 supported by an unloading arm 37 is attached to the terminal 33a of FIG. Then, the cargo handling device 21 installed on the hydrate transport ship 1 unloads as follows. That is, the pelletized natural gas stored inside the inner tank 11 of the hydrate transport ship 1 is taken out from the bottom of the inner tank 11 by the horizontal conveyor 23, and is passed through the rotary feeder 28 and the hopper 25 to one end of the screw conveyor 27. Sent to.

A part of the pelletized natural gas taken out from the hopper 25 is supplied to the vaporizer 29. The vaporizer 29 vaporizes the pelletized natural gas taken in by receiving hot gas from a heat source device (not shown). The pressurized gas vaporized in the vaporizer 29 is supplied to the pressure tank 31 and stored in the pressure tank 31 in a gas state.

Inner tank 1 of the hydrate ship 1
From inside 1 to horizontal conveyor 23, rotary feeder 28
The pelletized natural gas extracted by the
5 and the screw conveyor 27, and is sent to the bottom of the unloading post 33. The pellet-shaped natural gas sent to the bottom of the unloading post 33 is compressed gas supplied from the pressure tank 31 and / or compressed air generated by an air compressor (not shown) or other compressed non-pressurized gas. The inside of the unloading post 33 is raised by the active gas, and as shown in FIG. 2, it is sent to the pellet storage tank 41 of the hydrate storage berth via the unloading hose 39 supported by the unloading arm 37.

To summarize the above description of operation, the pelletized natural gas produced in the hydrate production berth is as follows:
It is loaded into the inner tank 11 of the hydrate transport ship 1 by the cargo handling device 61 installed on the hydrate manufacturing berth. When the loading of the pelletized natural gas into the hydrate ship 1 is completed, it is transported by sailing to the destination. The pelletized natural gas inside the inner tank 11 of the hydrate transport ship 1 that has arrived at the destination is unloaded to the pellet storage tank 41 on the hydrate storage berth by the cargo handling device 21 in the transport ship.

According to the first embodiment as described above, since pelletized natural gas is transported as it is in all the processes from the loading of the hydrate transport ship 1 to the unloading of the hydrate transport ship 1, Since there is no change in the state of natural gas, there is no need for the amount of heat associated with the change in state, and boil-off is small. Further, according to the above-described first embodiment, since pressurized gas is used for transportation, the number of facilities can be relatively small and the energy for operating the facilities can be small.

[Second Embodiment] FIGS. 4 and 5 are views for explaining a cargo handling device for a hydrate transport ship according to a second embodiment of the present invention. FIG. FIG. 5 is a view for explaining a state in which a hydrate storage tank of a hydrate manufacturing berth is loaded on a hydrate transport ship in the berth, and FIG. 5 is a pellet storage tank of the hydrate storage berth from the hydrate transport ship in the hydrate storage berth. It is a figure for demonstrating the state of unloading.

In FIG. 4, the hydrate manufacturing facility and the like provided on the hydrate manufacturing berth and the cargo handling device 61 for the hydrate transport ship are exactly the same as those in the first embodiment, and therefore, the same components are the same. And the description thereof will be omitted. 4 and 5, the cargo handling device 21a of the hydrate transport ship 1a according to the second embodiment.
However, it is only different from the first embodiment and there is no change in other configurations. Therefore, in the hydrate transport ship 1a according to the second embodiment, the same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

The cargo handling device 21 according to the second embodiment
a is a horizontal conveyor 2 provided at the bottom of the inner tank 11.
3, the pelletized natural gas discharged by 3 is guided to the bottom of the unloading post 33 by the shooter 24, and the vaporizer 29 and the pressure tank 31 are provided near the bottom of the unloading post 33. .

(Pelletized Natural Gas Loading Operation on the Hydrate Transport Ship 1) The pelletized natural gas loading operation on the hydrate transport ship 1 is exactly the same as that of the first embodiment, and therefore its explanation is omitted. .

(Unloading operation from the hydrate transport ship 1 to the hydrate storage tank 41 of the hydrate storage berth) In the cargo handling device 21 of the hydrate transport ship 1 according to the second embodiment, the horizontal conveyor 23 The pellet-shaped natural gas is taken out from the bottom of the inner tank 11 by the above, and is sent to the bottom of the unloading post 33 through the inside of the shooter 24.

The pelletized natural gas sent to the bottom of the unloading post 33 rises inside the unloading post 33 by the pressurized gas supplied from the pressure tank 31, and is supported by the unloading arm 37. It is supplied to the hydrate storage tank 41 of the hydrate storage berth via the hose 39.

Also according to the second embodiment as described above,
From the cargo of hydrate transport ship 1 to hydrate transport ship 1
Since the pelletized natural gas is conveyed as it is in all the processes of unloading, the state of the natural gas does not change, so the heat quantity associated with the state change is not required and the boil-off can be reduced. Further, according to the above-described first embodiment, since pressurized gas is used for transportation,
It requires less equipment and requires less energy to operate the equipment.

[0039]

As described above, according to the cargo handling device for a hydrate transport ship according to claims 1 to 3, since pelletized natural gas is transported as it is in all the processes of unloading from the hydrate transport ship, Since there is no change in the state of natural gas, it does not require the amount of heat associated with the change in state, and
It has the effect of requiring less boil-off. Further, according to the cargo handling device for a hydrate transport ship according to any one of claims 1 to 4, since pressurized gas is used for transportation,
There are relatively few facilities, and the energy for operating the facilities is also small, which is a good effect.

Further, according to the cargo handling device for a hydrate transport ship of claim 5, since the pelletized natural gas is transported as it is during the process of loading from the hydrate manufacturing berth to the hydrate transport ship, Since there is no state change, there is an effect that the amount of heat accompanying the state change is not required and boil-off is small. Moreover, according to the cargo handling apparatus for a hydrate transport ship according to claim 5 described above, since pressurized gas is used for transportation, the number of facilities can be relatively small and the energy for operating the facilities can be small. effective.

[Brief description of drawings]

FIG. 1 is a diagram for explaining a cargo handling device for a hydrate transport ship according to a first embodiment of the present invention, showing a state of loading from a hydrate storage tank of a hydrate manufacturing berth onto a hydrate transport ship. It is a figure for explaining.

FIG. 2 is a view for explaining the cargo handling device for a hydrate transport ship according to the first embodiment of the present invention, showing a state of unloading from a hydrate transport ship to a hydrate storage tank of a hydrate storage berth. It is a figure for explaining.

FIG. 3 is a view for explaining the cargo handling device for a hydrate transport ship according to the first embodiment of the present invention, and is an enlarged view showing a part of the cargo handling device mounted on the hydrate transport ship. Is.

FIG. 4 is a view for explaining a cargo handling device for a hydrate transport ship according to a second embodiment of the present invention, showing a state of loading from a hydrate storage tank of a hydrate manufacturing berth onto a hydrate transport ship. It is a figure for explaining.

FIG. 5 is a view for explaining a cargo handling device for a hydrate transport ship according to a second embodiment of the present invention, showing a state of unloading from a hydrate transport ship to a hydrate storage tank of a hydrate storage berth. It is a figure for explaining.

FIG. 6 is a diagram for explaining the outline of a conventional natural gas hydrated storage or transportation system, and is a diagram for explaining a methane hydrate production method and cargo in a methane hydrate production berth.

FIG. 7 is a diagram for explaining an outline of a conventional natural gas hydrated storage or transportation system, and is a diagram for explaining a methane hydrate regasification method and unloading in a hydrate storage berth.

[Explanation of symbols]

1,1a Hydrate transport ship 3 Outer skin 5 Double skin 7 Ship side tank 9 Heat insulating material 11 Inner tank 12 Upper deck 13 Heat transfer pipe 15 Protector 21 Cargo handling device 23 (mounted on hydrate transport ship) 23 Horizontal conveyor 25 Hopper 27 Screw Conveyor 28 Rotary Feeder 29 Vaporizer 31 Pressure Tank 33 Unloading Post 33a Terminal 35 Trace Tube 37 Unloading Arm 39 Unloading Hose 41 Pellet Storage Tank 43 (for Hydrate Storage Berth) 43 Rotary Feeder 51 Gas Field 53 Gas Well 55 Gas tank 57 Hydrate manufacturing machine 59 Hydrate storage tank 61 Cargo handling device 63 (on hydrate manufacturing berth) Conveying means 65 Pressure tank 67 Loading post 71 Loading hose

Claims (5)

[Claims] 1. A cargo handling device for a hydrate transport ship capable of loading and unloading pelletized natural gas from an inner tank of a hydrate ship to a pellet storage tank of a hydrate storage berth, wherein the pelletized natural gas in the inner tank is A horizontal conveyor for taking out, a vaporizer for taking out a part of the pelletized natural gas and heating it into pressurized gas of a predetermined pressure, a pressure tank for storing the pressurized gas from the vaporizer, and an inner tank for the lateral conveyor. A hydrate transport ship, comprising: an unloading post that conveys and guides the pelletized natural gas taken out from the inside with pressurized gas and / or pressurized air or pressurized inert gas supplied from a pressure tank. Cargo handling equipment. 2. A conveying means for conveying the pellets taken out of the horizontal conveyor to the bottom of the unloading post, or a shooter for guiding the pellets taken out of the horizontal conveyor to the bottom of the unloading post. The cargo handling device according to claim 1, which is used for a hydrate transport ship. 3. A trace pipe is provided on the outer periphery of the unloading post to heat the pellet-shaped natural gas in contact with the inner periphery of the unloading post so as to melt the pellet-shaped natural gas and facilitate movement of the pellet-shaped natural gas. The cargo handling device for a hydrate transport ship according to claim 1. 4. An unloading hose supported by an unloading arm can be attached to a terminal of the unloading post, and the unloading hose is used to remove the unloading post from the inner tank of the hydrate transport ship. 2. The pelletized natural gas pumped through the pipe is led to a hydrate storage tank of a hydrate storage berth.
A cargo handling device for a hydrate transport ship as described. 5. A cargo handling device on a hydrate manufacturing berth for loading and unloading pelletized natural gas from a hydrate storage tank on the hydrate manufacturing berth into a hydrate transport ship, which is a hydrate storage in the hydrate manufacturing berth. Conveying means for taking out the pelletized natural gas from the tank, a pressure tank for taking out and storing a part of the gaseous natural gas from the gas tank, and pelletized natural gas taken out from the inside of the hydrate storage tank by the conveying means A loading post that conveys and guides with pressurized gas and / or pressurized air or pressurized inert gas supplied from a pressure tank, and is supported by a loading arm provided on the hydrate manufacturing berth and connected to the loading post. Equipped with a loading hose Hydrate transport ship handling apparatus characterized by directing pumped through the loading post from the hydrate reservoir by scan pellets natural gas to the inner tank of the hydrate transport ship.