JP2007254531A - Apparatus for manufacturing gas hydrate pellet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the lowering of the manufacturing efficiency of pellets due to a large amount of water stored on compression rolls in the compression molding of a gas hydrate in the apparatus for manufacturing gas hydrate pellets with the use of a briquetting machine. <P>SOLUTION: This manufacturing apparatus has a dehydrating means composed of a pair of dehydrating rolls 3 provided between the compression roll 1 and a gas hydrate feed means 2. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a gas hydrate pellet manufacturing apparatus for manufacturing a pellet-shaped molded product by compression molding gas hydrate.

  In recent years, as a safe and economical means of transportation and storage of natural gas and the like (hereinafter referred to as “source gas”), a method using a gas hydrate obtained by hydrating a source gas to form a solid hydrate has attracted attention. Has been.

  In general, a gas hydrate is produced by reacting a raw material gas and raw material water at a low temperature and a high pressure. The gas hydrate thus obtained is in the form of a slurry containing moisture. Therefore, in order to improve handling during transportation and storage, a slurry-like gas hydrate is compression-molded and processed into a pellet-like molded product (hereinafter referred to as “pellet”).

  For manufacturing the pellets, a so-called briquetting roll type gas hydrate pellet manufacturing apparatus as shown in FIG. 3 is used.

  This manufacturing apparatus rotates a pair of metal compression rolls 31 having a plurality of pockets 30 serving as pellet forming molds on the outer peripheral surface, and continuously gasses between the compression rolls 31 by a hopper 32 and a screw feeder 33. The pellet 36 is manufactured by supplying the hydrate 35 and compression-molding it with the pockets 30 being inserted. (For example, refer nonpatent literature 1.).

However, if the moisture contained in the gas hydrate 35 is large, the water squeezed out by compression molding is stored 37 on the opposing surfaces of the pair of compression rolls 31. Here, since the gas hydrate 35 has a specific gravity smaller than that of water and accumulates near the surface of the water, it becomes difficult to supply the gas hydrate 35 by the screw feeder 33 or the like, and the production efficiency of the pellets 36 is reduced. It was.
Matsuo and 6 others, "Process development of NGH system (2nd report)-Demonstration of natural gas transport system by NGH-", Mitsui Engineering & Shipbuilding Technical Report, Mitsui Engineering & Shipbuilding Co., Ltd., February 2005, No. 184, p. 38-45

  The present invention has been made in view of such problems, and an object of the present invention is to provide a briquetting roll type gas hydrate pellet production apparatus in which the production efficiency of pellets does not decrease.

  In order to achieve the above object, the present invention according to claim 1 includes a pair of rotating compression rolls having a plurality of molds on the outer peripheral surface, and a supply means for supplying gas hydrate between the pair of rolls. A gas hydrate pellet production apparatus for producing pellets by compression-molding the gas hydrate in the molding die, wherein a dehydrating means for gas hydrate is provided between the pair of compression rolls and the supply means. This is a gas hydrate pellet manufacturing apparatus.

  The present invention described in claim 2 is the gas hydrate pellet manufacturing apparatus according to claim 1, wherein the dehydrating means comprises a pair of dewatering rolls.

  The present invention described in claim 3 is characterized in that at least one of the pair of dewatering rolls has a plurality of drain grooves formed in the circumferential direction and / or the axial direction on the outer peripheral surface. This is a gas hydrate pellet manufacturing apparatus.

  The present invention according to claim 4 is a first roll that rotates, a second roll and a third roll that are arranged in parallel in the vicinity of the first roll and rotate in the opposite direction to the first roll, and Supply means for supplying gas hydrate between the first roll and the third roll, the second roll has a plurality of molds on the outer peripheral surface, and the first roll and the third roll An apparatus for producing gas hydrate pellets, comprising dehydrating a gas hydrate and then compression-molding the dehydrated gas hydrate with the first roll and the second roll.

  The present invention described in claim 5 is characterized in that at least one of the first and third rolls has a plurality of drain grooves formed in the circumferential direction and / or the axial direction on the outer peripheral surface. 4. The gas hydrate pellet manufacturing apparatus according to 4.

  According to the present invention, the gas hydrate is dehydrated using the dehydrating means before the gas hydrate is compression molded, so that a large amount of water is not generated on the pair of rolls for compression molding. Since the supply of hydrate is not hindered, it is possible to prevent a reduction in production efficiency of gas hydrate pellets.

  Below, the gas hydrate pellet manufacturing apparatus which concerns on this invention is demonstrated with reference to drawings.

FIG. 1 shows a first embodiment of a gas hydrate pellet manufacturing apparatus according to the present invention.
This gas hydrate pellet manufacturing apparatus is characterized in that a pair of dewatering rolls 3 that are dewatering means are disposed between a pair of compression rolls 1 and a gas hydrate supply means 2.

  The pair of compression rolls 1 are arranged close to each other in parallel in the axial direction, and a plurality of pockets 4 that are pellet forming dies are formed on the outer peripheral surface thereof.

  The pair of dewatering rolls 3 are disposed directly above the pair of compression rolls 1 so as to be parallel to the pair of compression rolls 1. Although the outer peripheral surface of the dewatering roll 3 is smooth, a plurality of dewatering grooves may be formed in at least one of the circumferential direction and the axial direction in order to improve drainage efficiency during dewatering.

The dewatering roll 3 preferably has the same outer diameter as the compression roll 1.
In the compression roll 1 and the dewatering roll 3, a pair of rolls are rotated in opposite directions by a driving means (not shown).

  The gas hydrate supply means 2 continuously supplies the gas hydrate 5 between the dewatering rolls 3 and includes a hopper 6 and a screw feeder 7.

The operation of the gas hydrate pellet manufacturing apparatus having such a structure will be described below.
The gas hydrate 5 supplied onto the pair of dewatering rolls 3 by the gas hydrate supplying means 2 is dehydrated by being wound between the rotating dewatering rolls 3 and being pressurized. The dehydrated gas hydrate 9 falls as it is onto the compression roll 1 located directly below, and is compression-molded in the pockets 4 of the pair of compression rolls 1 to become pellets 10. At this time, moisture is produced from the gas hydrate 9 by compression molding, but since it has been sufficiently dehydrated by the dewatering roll 3 in advance, a large amount of water is not generated on the compression roll 1.

  2nd Embodiment of the gas hydrate pellet manufacturing apparatus which concerns on this invention is shown in FIG. In addition, the same code | symbol is attached | subjected to the part which is common in FIG.

  This gas hydrate pellet manufacturing apparatus is composed of two rolls 21 and 22 that rotate in opposite directions and are arranged close to and parallel to one rotating roll 20 and a gas hydrate supply means 2.

  The compression roll 21 that is the second roll is close to the compression roll 21 that is the first roll in a substantially horizontal direction, and the dewatering roll 22 that is the third roll is close to each other in parallel and obliquely upward.

  Although the outer peripheral surfaces of the compression dewatering roll 20 and the dewatering roll 22 are smooth, dewatering grooves may be formed in at least one of the circumferential direction and the axial direction in order to improve drainage efficiency during dewatering. A plurality of pockets 23 are formed on the outer peripheral surface of the compression roll 21.

Moreover, it is desirable that the outer diameters of these three rolls are the same.
The structure of the gas hydrate supply means 2 is the same as that of the first embodiment, but is tilted and installed so that the gas hydrate 5 can be supplied between the dehydration compression roll 20 and the dehydration roll 22.

The operation of the second embodiment will be described below.
The gas hydrate 5 supplied between the compression dehydration roll 20 and the dehydration roll 22 is dehydrated between the two rolls and then supplied again between the compression dehydration roll 20 and the compression roll 21. And it is compression-molded in the pocket 23 of the compression roll 21, and becomes the pellet 21. FIG.

  At this time, as in the case of the first embodiment, since the gas hydrate has been sufficiently dehydrated in advance, a large amount of water does not accumulate on the compression dewatering roll 20 and the compression roll 23.

  In addition, the shape of the pellet 24 manufactured in 2nd Embodiment becomes hemispherical.

It is sectional drawing which shows 1st Embodiment of the gas hydrate pellet manufacturing apparatus which concerns on this invention. It is sectional drawing which shows 2nd Embodiment of the gas hydrate pellet manufacturing apparatus which concerns on this invention. It is sectional drawing which shows the conventional gas hydrate pellet manufacturing apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Compression roll 2 Gas hydrate supply means 3 Dehydration roll 4 Pocket 5 Gas hydrate 6 Screw feeder 7 Hopper 8 Electric motor 9 Gas hydrate after dehydration
DESCRIPTION OF SYMBOLS 10 Pellet 20 Dehydration compression roll 21 Compression roll 22 Dehydration roll 23 Pocket 24 Hemispherical pellet 30 Pocket 31 Compression roll 32 Hopper 33 Screw feeder 34 Electric motor 35 Gas hydrate 36 Pellet

Claims (5)

A pair of rotating compression rolls having a plurality of molds on the outer peripheral surface, and a supply means for supplying gas hydrate between the pair of rolls, and the gas hydrate is compression-molded in the mold and pelletized In the gas hydrate pellet manufacturing apparatus for manufacturing the gas hydrate pellet manufacturing apparatus, gas hydrate dehydrating means is provided between the pair of compression rolls and the supply means. The gas hydrate pellet manufacturing apparatus according to claim 1, wherein the dehydrating unit includes a pair of dewatering rolls. 3. The gas hydrate pellet manufacturing apparatus according to claim 2, wherein at least one of the pair of dewatering rolls has a plurality of drain grooves formed in a circumferential direction and / or an axial direction on an outer peripheral surface. A first roll that rotates, a second roll and a third roll that are arranged in parallel in the vicinity of the first roll and rotate in a direction opposite to the first roll, and the first roll and the third roll A supply means for supplying gas hydrate therebetween, the second roll has a plurality of molds on the outer peripheral surface, dehydrated gas hydrate by the first roll and the third roll, and then the second roll An apparatus for producing gas hydrate pellets, wherein the dehydrated gas hydrate is compression molded by one roll and the second roll. 5. The gas hydrate pellet manufacturing apparatus according to claim 4, wherein at least one of the first and third rolls has a plurality of drain grooves formed in a circumferential direction and / or an axial direction on an outer peripheral surface. .

Images