JP5153714B2 - Gas hydrate pellet manufacturing method and apparatus - Google Patents

Description

  The present invention relates to a gas hydrate pellet manufacturing method and apparatus, and more particularly to a batch type gas hydrate pellet manufacturing method and apparatus.

  In the conventional gas hydrate pellet production method, from the gas hydrate production process to the gas hydrate pellet cooling process, each process of the gas hydrate production process → the gas hydrate slurry dehydration process → the pellet molding process, It was performed with another high-voltage device (for example, refer to Patent Document 1).

  As described above, when there are a plurality of high-voltage devices, the equipment cost increases. Further, when there are a plurality of high-voltage devices, for example, when an on-board manufacturing facility (FPSO) is assumed, there is a possibility that it cannot be installed in a limited installation area.

JP 2003-105362 A

  The present invention solves the above problems by reducing the number of high-pressure large-scale equipment from the gas hydrate production process to the gas hydrate pellet cooling process, and reduces the gas / liquid / solid separation process. The goal is to simplify the process.

  In the gas hydrate pellet manufacturing method of the present invention, raw water mixed with raw material gas is introduced into a cylindrical filter having a water passage on the wall surface to generate gas hydrate, and the reaction heat generated at that time is It is removed by cold water introduced into the filter, and the piston in the filter is moved toward the outlet of the filter to dehydrate the raw material water from the water inlet of the filter and squeeze the gas hydrate, at the outlet of the filter After opening the lid that closed the die plate, the piston is re-driven toward the outlet of the filter to push the gas hydrate out of the die plate by a certain length, and then along the die plate surface. Move the cutter blade and the extruder to form a gas hydrate pellet of a certain length and dispose it to the outside of the die plate. It is an butterfly.

  The method for producing gas hydrate pellets of the present invention is characterized in that raw material gas is injected into raw water in the form of bubbles to produce raw material water mixed with raw material gas in advance.

  In the gas hydrate pellet manufacturing apparatus of the present invention, a cylindrical filter having a water passage opening on a wall surface is provided in a bubble column, at least one stage of a cold water supply pipe is disposed in the middle of the filter, and a piston is provided in the filter. And a cutter blade that cuts a rod-shaped gas hydrate extruded from the die plate along the surface of the die plate into a fixed length, and a cut into a fixed length. A pellet dispenser for dispensing the gas hydrate pellets to the outside of the die plate is provided.

  The gas hydrate pellet manufacturing apparatus of the present invention is characterized in that a bubble generator is attached to a bubble column.

  The apparatus for producing gas hydrate pellets of the present invention is characterized in that a plurality of cold water supply pipes are provided at a predetermined interval in the longitudinal direction of the filter at the body of the filter.

  Since the present invention has the functions of gas hydrate generation, dehydration and compression molding, the cost can be reduced by reducing the number of high-pressure main machines, and the equipment area can be reduced.

1 is an overall view of a gas hydrate pellet manufacturing apparatus according to the present invention. FIG. 2 is a detailed view of part A in FIG. 1. It is CC sectional drawing of FIG. It is an expanded sectional view of the B section of FIG. It is a perspective view of a chopper and a pellet dispenser. It is an expanded sectional view of a bubble generating tool. It is explanatory drawing of the gas hydrate pellet manufacturing method which concerns on this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the gas hydrate pellet production apparatus 1 of the present invention includes a pellet production device 2, a gas-liquid separator 3, a bubble generator 4, a blower 5, a plurality of heat exchangers 6, 7 and a pump 8, 9 and 10 are provided.

  As shown in FIG. 1, the pelletizer 2 has a structure in which a cylindrical filter 22 having a spiral or annular water passage 21 on a wall surface is provided in a hollow bubble column 23 having pressure resistance. Yes. As shown in FIG. 4, the filter is a filter 22 in which a metal triangular cross-section member 24 is spirally wound at a predetermined interval and the outside is fixed to a rod-like support member 25, or a metal triangle. After the cross-sectional material is formed into an annular shape, a filter (not shown) is used in which the cross-sectional materials are stacked in multiple stages at a predetermined interval, and the outside is fixed with a rod-shaped support member.

  In the filter 22, a gap between adjacent triangular cross-section members 24, 24 is a water passage 21. The filter is not limited to the above-described filter, and may be any filter that can dehydrate the gas hydrate slurry. The filter 22 has a plurality of stages (for example, three stages) of cold water supply pipes 26 arranged at predetermined intervals in the height direction of the filter 22 in the body portion to remove heat generated by the gas hydrate. It is like that.

The filter 22 has a piston 27 therein, and is provided with a die plate 28 for compression molding at an upper outlet thereof (see FIG. 2). The piston 27 reciprocates between the bottom 23 a of the bubble tower 23 and the die plate 28 by a piston drive cylinder 29 provided at the lower part of the bubble tower 23. In this example, a fluid cylinder is used as the piston drive means. However, the device size can be reduced by using a screw shaft instead of the fluid cylinder. Die plate 28 is a circular cylindrical plate with a plurality of holes to form a gas hydrate H, the extruded gas hydrate H here a rod.

  As shown in FIG. 2, the bubble column 23 is provided with a lid 30 that closes the upper surface of the die plate 28 at the top (head) thereof. The lid 30 reciprocates between the upper surface of the die plate 28 and a retracted position that does not interfere with the chopper (cutter blade) 31 and the pellet dispenser 32 described later. The lid 30 is moved up and down by a lid driving cylinder 33.

  Furthermore, as shown in FIG. 4, the bubble column 23 includes a chopper 31 and a pellet dispenser 32 at the upper part (head). As shown in FIG. 5, the chopper 31 uses a wire wire as a cutter blade, and the pellet dispenser 32 is formed in a substantially arc shape and is located on the back surface of the chopper 31. The piston rod 36 of the chopper drive cylinder 35 is linked to both ends, and the gas hydrate pellets P that are cut while cutting the rod-like gas hydrate H pushed out from the die plate 28 by the chopper 31 are die plates. 28 is dispensed to the screw conveyor 39.

  The bubble generator 4 has a structure in which a sintered element 41 is built in a sealed container 40. As shown in FIG. 6, the sintering element 41 is installed in a lidless sintering element support box 42, and a raw material gas introduction pipe 43 is connected to the bottom of the sintering element support box 42.

  Returning to FIG. 1 again, the drainage part 11 between the filter 22 of the pelletizer 2 and the bubble column 23 communicates with the gas phase part 3a of the gas-liquid separator 3 via the pipe 12, The top of the liquid separator 3 communicates with the raw material gas introduction pipe 43 of the bubble generator 4 via the pipe 13, and the bottom of the gas-liquid separator 3 communicates with the container 40 of the bubble generator 4 via the pipe 14. doing.

  Further, the container 40 of the bubble generator 4 communicates with the inside of the filter 22 via the pipe 15. A pipe 16 branched from a pipe 14 that communicates the gas-liquid separator 3 and the bubble generator 4 is connected to the cold water supply pipe 26 via two heat exchangers 6 and 7. A raw material water supply pipe 44 is connected to a pipe 16 ′ that communicates the two heat exchangers 6 and 7. A source gas supply pipe 45 is connected to the source gas introduction pipe 43 of the bubble generator 4.

  Furthermore, a screw conveyor 39 that conveys the gas hydrate pellets P to the cooling step 50 is provided at the head of the pellet maker 2. In addition, the blower 5 is provided in the pipe 13 that communicates the gas-liquid separator 3 and the raw material gas introduction pipe 43 of the bubble generator 4, and the pipe 12 that communicates the pellet production device 2 and the gas-liquid separator 3 includes A pump 8 is provided, a pump 9 is provided in the pipe 14 that communicates the gas-liquid separator 3 and the bubble generator 4, and a pump 10 is provided in the raw water supply pipe 44.

  The equipment related to the pipe 16 branched from the pipe 14 communicating the gas-liquid separator 3 and the bubble generator 4, that is, the two heat exchangers 6 and 7, the cold water supply pipe 26, and the two heat exchangers. The raw material water supply pipe 44 connected to the pipe 16 ′ communicating with the pipes 6 and 7, the pump 10 provided in the raw water supply pipe 44 and the like do not constitute essential requirements of the present invention.

  As shown in FIG. 1, a predetermined pressure (for example, 50 MPa) is applied from the source gas introduction pipe 43 to the sintered element 41 in the bubble generator 4 while the raw material water W is supplied from the pipe 14 to the bubble generator 4. When the raw material gas G is supplied, the raw material gas G is released as fine bubbles from the sintered element 41 into the raw material water W.

  The raw material water W mixed with the bubble-shaped raw material gas G is supplied to the cylindrical filter inside 22 of the pelletizer 2 through the pipe 15. The raw material water W in the filter 22 is hydrated with the raw material gas G to become gas hydrate H. The reaction heat generated when the gas hydrate is generated is removed by cold water (for example, 0.1 to 4 ° C.) W ′ supplied from the cold water supply pipe 26.

  Since the raw water W in the bubble column 23 is pumped up to the gas-liquid separator 3 by the pump 8, the raw water W in the filter 22 is discharged from the water inlet 21 of the filter 22 to the outside of the filter 22. 11 and the gas hydrate H is stored in the cylindrical filter 22.

  The raw material gas G separated from the raw material water W flowing into the gas-liquid separator 3 is supplied to the sintering element 41 of the bubble generator 4 by the blower 5. On the other hand, the raw water W is returned to the bubble generator 4 via the pipe 14. At that time, a part of the raw water W is cooled to a predetermined temperature (for example, 0.1 to 4 ° C.) by the heat exchangers 6 and 7 and then supplied into the filter 22 from the cold water supply pipe 26.

  After a predetermined time has elapsed, the piston 27 is pushed up toward the die plate 28 provided at the outlet of the filter 22, and the gas hydrate H staying in the cylindrical filter 22 is squeezed while being pressurized. For example, gas hydrate is squeezed to a slurry concentration of about 90%.

  Then, as shown in FIG. 7, after the lid 30 covering the upper surface of the die plate 28 is retracted upward, the piston 27 is pushed up again so that the rod-shaped gas hydrate H is pushed from the die plate 28 by a certain length. Extrude. Thereafter, the chopper 31 is moved forward along the upper surface of the die plate 28 to cut the rod-shaped gas hydrate H to obtain a gas hydrate pellet P. The gas hydrate pellets P on the die plate 28 are delivered to the screw conveyor 39 by the pellet dispenser 32 and then supplied to the cooling step 50.

21 Water outlet 22 Filter 23 Bubble tower 26 Cold water supply pipe 27 Piston 28 Die plate 31 Cutter blade "
32 Pellet dispenser H Gas hydrate P Gas hydrate pellet

Claims (5)

  Raw water mixed with raw material gas is introduced into a cylindrical filter having a water passage on the wall surface to generate gas hydrate, and the reaction heat generated at that time is removed by cold water introduced into the filter, After moving the piston in the filter toward the outlet of the filter to dehydrate the raw water from the water inlet of the filter and squeeze the gas hydrate, after opening the lid that closed the die plate at the outlet of the filter The piston is re-driven toward the outlet of the filter to extrude the gas hydrate from the die plate by a certain length in a bar shape, and then the cutter blade and the extruder are moved along the die plate surface. Long gas hydrate pellets are formed, after which the gas hydrate pellets are pushed out of the die plate by an extruder Gas hydrate pellet production wherein the paying out.   2. The method for producing gas hydrate pellets according to claim 1, wherein the raw material gas mixed with the raw material gas is produced by injecting the raw material gas into the raw material water in the form of bubbles.   A cylindrical filter having a water passage opening on the wall surface is provided in the bubble column, at least one stage of cold water supply pipe is disposed in the middle of the filter, a piston is provided in the filter, and a die plate is provided at the outlet of the filter. And a cutter blade for cutting a rod-shaped gas hydrate extruded from the die plate along the surface of the die plate to a certain length, and a gas hydrate pellet cut to a certain length on the outside of the die plate A gas hydrate pellet manufacturing apparatus characterized in that a pellet dispenser for dispensing is provided.   The gas hydrate pellet manufacturing apparatus according to claim 3, wherein a bubble generator is attached to the bubble column.   4. The gas hydrate pellet manufacturing apparatus according to claim 3, wherein a plurality of cold water supply pipes are provided in the body of the filter at predetermined intervals in the longitudinal direction of the filter.

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