MITSUI ENGINEERING AND SHIPBUILDING CO., LTD. (Japan)
NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY (Japan)
Inventor
Iwabuchi Wataru
Egami Tomoaki
Narita Hideo
Nagao Jiro
Suzuki Kiyofumi
Abstract
[Problem] To provide a method of molding a gas hydrate pellet for conveniently handling a natural gas hydrate during a transporting or storing operation and thus improving the practical use of the natural gas hydrate. [Solution] When gas hydrate slurry supplied to a compression room (21) is pressurized and compressed by forwardly moving a compression plunger (21e), the moving speed of the compression plunger (21e) is lowered as much as possible, preferably kept lower than a displacement x 10-2 [m/min] where the displacement is a distance traveled by the compression plunger (21e) during compression. Owing to the low-speed movement, the bonding force between gas hydrate particles can be improved to be able to mold a gas hydrate pellet having large breaking strength.
C10L 3/06 - Natural gasSynthetic natural gas obtained by processes not covered by , or
B01J 2/22 - Processes or devices for granulating materials, in generalRendering particulate materials free flowing in general, e.g. making them hydrophobic by pressing in moulds or between rollers
B30B 9/04 - Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using press rams
2.
METHOD AND STRUCTURE FOR EXTENDING AND RETRACTING TELESCOPIC BOOM FOR CONSTRUCTION CRANE FOR TOWER-LIKE STRUCTURE
MITSUI ENGINEERING AND SHIPBUILDING CO., LTD. (Japan)
Inventor
Minami yoichi
Kawamoto jun
Ono junji
Abstract
A structure and a method for extending and retracting a telescopic boom, for lifting up to a required height a crane used to construct a tower-like structure such as a high rise support or a tower. A main cylinder (18) is housed on the inner side of telescopically combined booms (11-17), and a piston rod (19) reciprocated by operation of the main cylinder (18) is mounted directing downward. The front end of the piston rod (19) is connected to the boom (11) on the outer side, and the lower end of the main cylinder (18) is connected to the boom (12) directly adjacent and on the inner side of the boom (11). When the main cylinder (18) is operated to advance the piston rod (19), the main cylinder (18) ascends, causing the boom (12) to extend relative to the boom (11). Fixing the lower end section of the ascended boom (12) and the upper end section of the boom (11) to each other enables the boom (12) to be maintained extended relative to the boom (11). The telescopic boom (10) is extended by repeating the above procedure. Also, the main cylinder (18) ascends as the telescopic boom (10) is extended.
B66C 23/30 - Cranes comprising essentially a beam, boom or triangular structure acting as a cantilever and mounted for translatory or swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib cranes, derricks or tower cranes specially adapted for use in particular locations or for particular purposes for use on building sitesCranes comprising essentially a beam, boom or triangular structure acting as a cantilever and mounted for translatory or swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib cranes, derricks or tower cranes specially adapted for use in particular locations or for particular purposes constructed, e.g. with separable parts, to facilitate rapid assembly or dismantling, for operation at successively higher levels, for transport by road or rail constructed to operate at successively higher levels with frameworks composed of telescopic elements
B66C 23/28 - Cranes comprising essentially a beam, boom or triangular structure acting as a cantilever and mounted for translatory or swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib cranes, derricks or tower cranes specially adapted for use in particular locations or for particular purposes for use on building sitesCranes comprising essentially a beam, boom or triangular structure acting as a cantilever and mounted for translatory or swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib cranes, derricks or tower cranes specially adapted for use in particular locations or for particular purposes constructed, e.g. with separable parts, to facilitate rapid assembly or dismantling, for operation at successively higher levels, for transport by road or rail constructed to operate at successively higher levels
MITSUI ENGINEERING AND SHIPBUILDING CO., LTD. (Japan)
Inventor
Nagamori, Shigeru
Kato, Yuichi
Hisatani, Masujiro
Matsuo, Kazuyoshi
Horiguchi, Kiyoshi
Hiraide, Masataka
Takahashi, Masahiro
Abstract
A fluidized-bed gas hydrate generator (3) which comprises: a vertical vessel having an introduction opening (30) through which a powdery or granular gas hydrate containing unreacted water is introduced; a dispersion plate disposed between the introduction opening (30) and the bottom of the vertical vessel; a feed gas circulation line (42) having a circulation gas blower (32) for sucking a feed gas in the vertical vessel through a suction opening formed in an upper part of the vertical vessel and circulating it to a lower part of the vertical vessel; and a discharger (38) for discharging the gas hydrate present above the dispersion plate. Due to the constitution, the gas hydrate is fluidized and the gas/liquid contact efficiency is heightened to efficiently react the unreacted water with the feed gas. As a result, the conversion of unreacted water into a gas hydrate can be effectively heightened.
MITSUI ENGINEERING AND SHIPBUILDING CO., LTD. (Japan)
Inventor
Kato, Yuichi
Nagamori, Shigeru
Miyata, Junya
Hisatani, Masujiro
Iwasaki, Toru
Abstract
Dehydrating tower (2) comprising a vertical vessel; screw conveyor (26) for discharging of gas hydrate from an upper part of the vessel; multiple apertures (52) provided on the side of the vessel; drain part (21) defining drain chamber (51) enveloping the multiple apertures (52); and drain pipeline (53) connected to a lower part of the drain chamber (51), wherein the drain pipeline (53) is fitted with flow rate control valve (23) and wherein the degree of opening of the flow rate control valve is controlled by a controller so that the water level of the drain chamber (51) is held at a set water level to thereby regulate the water surface of the drain chamber (51), namely, the water surface for immersion of particulate gas hydrate, attaining control of the concentration of gas hydrate discharged from the dehydrating tower (2).
MITSUI ENGINEERING AND SHIPBUILDING CO., LTD. (Japan)
Inventor
Hisatani, Masujiro
Matsuo, Kazuyoshi
Miyata, Junya
Abstract
A process for producing a gas hydrate through hydration reaction between a starting gas and water, characterized in that residual characteristics signifying the relationship between particle diameter at the time of gas hydrate formation and gas residual ratio in gas hydrate which decreases with time passage during the transfer after gas hydrate formation are determined in advance, and that the gas residual ratio corresponding to the particle diameter of gas hydrate within product during the formation of gas hydrate is determined on the basis of the above residual characteristics, and that the formation temperature of gas hydrate is controlled so that the value of performance function represented as a product of the determined gas residual ratio multiplied by a hydrate conversion ratio being a proportion of gas hydrate within product is maximized.