JP4414770B2 - Gas hydrate transport method and transport bag - Google Patents

Description

The present invention relates to a gas hydrate transportation method for transporting gas hydrate, which is a hydrate of natural gas and water mainly composed of hydrocarbons such as methane, into a light and durable airtight bag and transports it to a consumption area, and It relates to transport bags.

Conventionally, natural gas and generated water are introduced into a gas hydrate generator, and after the slurry-like gas hydrate generated in the gas hydrate generator is subjected to dehydration, cooling, and decompression processes, After molding and solidifying into a shape suitable for transportation, and storing the molded and solidified gas hydrate in a storage container (product storage container), the storage container is loaded together with the storage container on a transport ship and transported to the receiving base. At the receiving terminal, the gas hydrate is unloaded together with the storage container and temporarily stored in the frozen storage facility. After that, the gas hydrate stored in the frozen storage facility is discharged from the storage container to the decomposition device for gasification. A method of transporting natural gas that supplies this to consumers through a lifeline has been proposed (for example, see Patent Document 1).
Japanese Patent Laid-Open No. 2001-280582 (page 3, FIG. 1)

  However, the conventional method of transporting natural gas does not disclose the shape and structure of the storage container for storing gas hydrate, but if this storage container is made of steel plate, the weight of the storage container can be reduced. Since it occupies a certain proportion, there is a problem that the handling and transportation are hindered.

  In addition, when the gas hydrate is filled in the storage container, the storage container may not be crushed by the weight of the gas hydrate even if the storage containers are stacked in multiple stages, but the gas hydrate is stored in the storage container. When only a small amount is filled in the storage container, if the storage container is stacked in multiple stages, the storage container may be crushed by the weight of the gas hydrate.

  Further, in the case of a steel storage container, the recovery efficiency of the storage container is not good because the storage container cannot be folded compactly even when the empty storage container is recovered.

  Further, when the storage container is made of steel plate, it is assumed that a part of the gas hydrate is decomposed and natural gas is generated. For example, it is necessary to design the container as a pressure-resistant container of about 1 MPa. There are restrictions on the shape of the container, such as a tank shape.

  Further, when the storage container is made of a steel plate, it is necessary to take measures to avoid adhesion of gas hydrate and bridging phenomenon.

  The present invention has been made to solve the above-mentioned problems, and one of its purposes is to facilitate the handling and transportation of gas hydrate.

  Another object of the present invention is to prevent the transport bags from being crushed even if the transport bags are stacked in multiple stages regardless of the filling amount of the gas hydrate.

Another object of the present invention is to make it possible to collect a gas hydrate transport bag by folding it small.

  Another object of the present invention is to make it less likely to be restricted by the shape of the container as compared with a steel container.

  Another object of the present invention is to make it easier to avoid adhesion of gas hydrate and bridging as compared with a steel plate container.

  In order to solve the above problems, the present invention is formed as follows.

That is, the gas hydrate transport method according to the present invention generates a gas hydrate that is a hydrate of natural gas and water by reacting natural gas with water in a gas hydrate production plant. The gas hydrate filling pipe is inserted into the gas hydrate introduction port provided in the flat airtight bag, and the bag after the gas hydrate filling is mounted on the transportation means to regas adjacent to the consumption area. transported towards the plant, jammed bags of gas hydrate at this regasification plant with sets the partitioned accommodating frame in a partition plate, the gasification vessel to the gas connector provided on a side surface of said bag The gas hydrate is decomposed by connecting the gas delivery pipe of the gasification tank and further connecting the drainage pipe of the gasification tank to the drainage connector .

The gas hydrate transport method according to the present invention is characterized in that in a regasification plant, a bag filled with gas hydrate is immersed in a hot water tank as it is to regasify the gas hydrate in the bag.

The gas hydrate transport method according to the present invention is characterized in that, in a regasification plant, a bag filled with gas hydrate is showered with water or a hot water shower, and the gas hydrate in the bag is regasified.

In the gas hydrate transport method according to the present invention , in a regasification plant, a bag filled with gas hydrate is directly carried into a room heated to normal temperature or heated to regasify the gas hydrate in the bag. It is a feature.

On the other hand, the gas hydrate transport bag according to the present invention has a light and durable airtight bag body, and the bag body has a gas hydrate inlet that can be sealed, and when the gas hydrate is decomposed. In a gas hydrate transport bag provided with a gas connector with a valve for discharging the generated natural gas and a drain connector with a valve for draining water generated during decomposition of the gas hydrate , both sides of the bag body are provided. It is characterized by being connected to each other by a plurality of connecting materials and maintaining a flat shape even when a predetermined amount of gas hydrate is filled in the bag .

As described above, in the gas hydrate transport method according to the present invention , natural gas and water are reacted in a gas hydrate production plant to produce a gas hydrate that is a hydrate of natural gas and water. Gas hydrate is filled by inserting a gas hydrate filling tube into the gas hydrate inlet provided in a flat airtight bag, and the bag after gas hydrate filling is mounted on transportation means and adjacent to the consumption area transported towards the regasification plant, and thereby set the bag jammed in the re-gasification plant of gas hydrate partitioned accommodating frame in a partition plate, the gas connector provided on the side of the bag Since the gas delivery pipe of the gasification tank is connected and the drainage connector of the gasification tank is connected to the drainage connector to decompose the gas hydrate, the weight is reduced compared to the conventional case, and cargo handling and transportation are facilitated.

  In addition, since the bag for filling the gas hydrate has flexibility, the bag is not crushed regardless of the filling amount of the gas hydrate even if the bags are stacked in multiple stages. Moreover, since this bag can be collected by folding it small, it can be collected efficiently.

  Moreover, since said bag is not made from a steel plate, it is hard to receive restrictions by the shape of a container, etc., and it becomes possible to form in arbitrary shapes. Further, for the same reason, it becomes easy to avoid adhesion of gas hydrate and bridging phenomenon.

According to the gas hydrate transport method of the present invention , in a regasification plant, a bag filled with gas hydrate is immersed in a hot water tank as it is to regasify the gas hydrate in the bag. It is not necessary to take out the gas hydrate from the tank, and labor saving can be achieved.

The gas hydrate transport method according to the present invention is stored in a conventional manner in a regasification plant in which a bag filled with gas hydrate is subjected to a water or hot water shower to regasify the gas hydrate in the bag. It is not necessary to take out the gas hydrate from the container, and labor saving can be achieved.

In the gas hydrate transportation method according to the present invention , in a regasification plant, a bag filled with gas hydrate is directly carried into a room heated to room temperature or reheated to regasify the gas hydrate in the bag. There is no need to take out the gas hydrate from the storage container as in the prior art, and labor saving can be achieved.

On the other hand, the gas hydrate transport bag according to the present invention is configured so that both sides of the bag body are connected to each other by a plurality of connecting materials, and the flat shape is maintained even when a predetermined amount of gas hydrate is filled in the bag. While the bag body can be prevented from being deformed, a flat shape can be maintained even when a predetermined amount of gas hydrate is filled in the bag.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram of a gas hydrate transport method according to the present invention.

  In FIG. 1, A indicates a gas hydrate production plant. A high-pressure (for example, 5 MPa) natural gas g supplied from a high-pressure gas pipe 21 and a predetermined temperature (for example, supplied from a produced water supply pipe 22). 5 ° C.) produced water w is introduced into a pressure-resistant gas hydrate production tank 23 to produce natural gas hydrate which is a hydrate of natural gas g and produced water w.

  Here, the gas pressure of the natural gas is preferably in the range of 5 MPa to 6 MPa. Further, the water temperature of the produced water is preferably in the range of 0 ° C to + 5 ° C.

  At that time, the generated water w is sprayed into the gas hydrate generating tank 23 by a spraying device (nozzle) (not shown). And the produced water w collected at the bottom of the gas hydrate production tank 23 is constantly circulated along the circulation line 24 provided in the gas hydrate production tank 23, and generated during the gas hydrate production by the refrigerator 25 during that time. The reaction heat is removed.

  The slurry-like gas hydrate G produced in the gas hydrate production tank 23 is dehydrated, cooled and depressurized by the pretreatment facility 26 to become powdery powder. This gas hydrate powder G ′ is stored in 1 to 1000 kg, preferably 5 to 100 kg in a transport bag 30 to be described later in a packing step 27 subsequent to the generating step.

  Further, as described above, the gas hydrate may be transported as a powder, but may be reprocessed into granules that are easy to transport and store, for example, by a granulator such as a pelletizer. The granular gas hydrate pellets can be any shape and size as long as they are easy to transport and store.

  As shown in FIG. 2, the transport bag 30 includes a bag body 31 having a rectangular shape (in plan view), and has a gas hydrate introduction port 33 having a flange 32 at an upper portion thereof. Further, on one side surface of the bag body 31, a gas connector 34 with a valve for discharging natural gas generated at the time of gas hydrate regasification and water generated at the time of gas hydrate regasification are drained. A drainage connector 35 with a valve is provided. The gas connector 34 is preferably provided close to the upper side of the transport bag 30. The drainage connector 35 is preferably provided on the lower side of the transport bag 30 opposite to the gas connector 34.

  The transport bag 30 has a volume that is 20 to 30% larger than the amount of gas hydrate that is actually filled, and when a predetermined amount of gas hydrate is filled, a gap is formed at the top of the bag. Good.

  Further, the transport bag 30 is preferably a light, strong and airtight bag. As shown in FIG. 3, for example, a flexible member such as rubber or synthetic resin reinforced by a reinforcing material 36 such as a cloth or a net is used. The bag formed by 41 is preferred. In addition, the transport bag 30 is formed by connecting the upper reinforcing member 36a and the lower reinforcing member 36b with a plurality of connecting members 37 in FIG. 3, and the bag main body even if a predetermined amount of gas hydrate is filled in the bag. 31 holds a flat shape.

  Here, examples of the rubber include natural rubber and synthetic rubber.

  Moreover, as synthetic resin, nylon, FRP, vinyl chloride etc. can be mentioned, for example.

  Examples of the reinforcing material and the connecting material include natural fibers such as cotton and hemp, semi-synthetic fibers such as acetate and tevilon, and synthetic fibers such as nylon, polyester, and polypropylene.

  Further, as shown in FIG. 4, the gas hydrate introduction port 33 is usually sealed by a metal plate-like lid 38. The lid 38 is fixed to the flange 32 of the gas hydrate introduction port 33 by a fastening tool 39 such as a bolt and a nut. A packing 40 is provided between the lid 38 and the flange 32.

  In the packing step 27, as shown in FIG. 5, a gas hydrate filling pipe 28 following the pretreatment facility 26 is inserted into the gas hydrate introduction port 33 of the transport bag 30, and a predetermined amount of gas hydrate powder G ′ is added. For example, after filling 10 kg to 30 kg, the gas hydrate inlet 33 of the transport bag 30 is sealed with a metal lid 38 as shown in FIG.

  The transport bag 30 filled with the gas hydrate powder G ′ in the parking process 27 is temporarily stored in the freezer storage 29 adjacent to the packing process 27 as shown in FIG. The packing process 27 and the freezer storage 29 are maintained at −15 ° C. to −20 ° C., for example, at normal pressure.

  The gas hydrate-containing transport bag 30 stored in the freezer storage 29 is then stored on the gas consumer side such as a suburban convenience store by means of a freezer car 42 whose interior is maintained at -15 ° C to -20 ° C. To the regasification plant B and stored in the freezer storage 43 thereof. The frozen storage 43 is also held at -15 ° C to -20 ° C under normal pressure.

  The regasification plant B includes a regasification facility 50 adjacent to the refrigerated storage 43 and regasifies the gas hydrate powder in the transport bag 30. As shown in FIG. 1, the regasification facility 50 includes a water storage tank 51 and a tank-like gasification tank 52 that stores water W. The gasification tank 52 includes a heater 53 and a gas delivery pipe 54. And a drain pipe 55.

  Examples of the heat medium supplied to the heater 53 include exhaust heat, water, and air.

  When the gas hydrate powder in the transport bag 30 is regasified, the gas delivery pipe 54 of the gasification tank 52 is connected to the gas connector 34 provided on the side surface of the transport bag 30 as shown in FIG. On the other hand, the drain pipe 55 of the gasification tank 52 is connected to the drain connector 35 provided on the side surface of the transport bag 30.

Thereafter, when a heating medium N of, for example, 12 ° C. is supplied to the heater 53, the gas hydrate powder is warmed in the transport bag 30 through the water W in the gasification tank 52, and natural gas is contained. The melting ice melts and natural gas is released. This natural gas g is supplied through a gas delivery pipe 54 to a consumer (consumer), for example, a small gas turbine power generator (not shown) installed in a convenience store.

Here, a pressure gauge 59 is provided in the gas delivery pipe 54 to control the supply amount of the heat medium so that the pressure of the natural gas g supplied to the consumer (consumer) becomes a normal pressure. . 61 is a valve provided in the heater 53, and 60 is a control device.

  On the other hand, the decomposed water w generated at the time of regasification is stored in the water storage tank 51 through the drain pipe 55 and then used for supplying middle water or boiler water.

  Since the heat medium N that has passed through the heater 53 is cooled by the gas hydrate powder and has a reduced temperature (for example, 5 ° C.), the cold energy can be used as a heat source such as an air conditioner.

  If two or more gasification tanks 52 are provided and operated alternately, the gas hydrate powder in the transport bag 30 can be continuously regasified. The transport bag 30 emptied by regasification is folded or flattened, and then returned to the gas hydrate production plant A by the collection vehicle 45 and reused.

  By the way, when the transport bag 30 containing the gas hydrate powder is stored in the gasification tank 52 filled with water, the transport bag 30 floats on the surface of the water, and is therefore set in the storage frame 56 provided in the gasification tank 52. As shown in FIG. 7, the housing frame 56 is partitioned by a large number of partition plates 57, and a lid 58 that can be opened and closed is provided in each partition to prevent the transport bag 30 from floating. The front surface of the housing frame 56 is open so as not to interfere with the gas delivery pipe 54 and the drain pipe 55 of the gasification tank 52.

  In the above description, when gas hydrate is regasified, a gasification tank filled with water is used. However, the present invention is not limited to this. For example, water or hot water is showered in a transport bag containing gas hydrate. Or, it can be carried into a room heated to room temperature or higher and regasified.

  Further, the transportation means is not limited to a land-based collection vehicle, and examples thereof include a transport ship as a water transportation means.

It is a schematic block diagram of the gas hydrate transport method which concerns on this invention. It is a front view of the transportation and storage bag which concerns on this invention. It is XX sectional drawing of FIG. It is a perspective view of a gas hydrate introduction port. It is explanatory drawing with which a gas hydrate powder is filled into a transport and storage bag. It is explanatory drawing which sealed the gas hydrate introduction port with the lid | cover after gas hydrate powder filling. It is explanatory drawing of the storage frame which sets a transport and storage bag.

A gas hydrate production plant
B Regasification plant
G gas hydrate
g Natural gas
w water
30 bags

Claims (5)

  Natural gas and water are reacted at a gas hydrate production plant to produce gas hydrate, which is a hydrate of natural gas and water, and this gas hydrate is gas hydrate provided in a flat airtight bag. The gas hydrate filling pipe is inserted into the rate inlet and filled, and the bag after gas hydrate filling is mounted on the transportation means and transported to the regasification plant adjacent to the consumption area. Set the bag filled with gas hydrate in the housing frame partitioned by the partition plate, connect the gas delivery pipe of the gasification tank to the gas connector provided on the side of the bag, and connect the drainage connector to the drainage connector. A method for transporting a gas hydrate, comprising connecting a drain pipe of a gasification tank to decompose the gas hydrate.   The gas hydrate transport method according to claim 1, wherein in the regasification plant, the bag filled with gas hydrate is immersed in a hot water tank as it is to regasify the gas hydrate in the bag.   The gas hydrate transport method according to claim 1, wherein in the regasification plant, a bag filled with gas hydrate is showered with water or hot water to regasify the gas hydrate in the bag.   The gas hydrate transportation method according to claim 1, wherein in the regasification plant, the bag filled with the gas hydrate is directly carried into a room at room temperature or a temperature, and the gas hydrate in the bag is regasified. A gas hydrate inlet having a light and strong airtight bag body, a gas hydrate introduction port capable of being sealed in the bag body, and a gas connector with a valve for discharging natural gas generated when the gas hydrate is decomposed And a gas hydrate transport bag provided with a drainage connector with a valve for draining water generated during decomposition of the gas hydrate, both sides of the bag body are connected to each other by a plurality of connecting materials, and are placed in the bag. A gas hydrate transport bag characterized by maintaining a flat shape even when a fixed amount of gas hydrate is filled .

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