JPS59137778A - Re-liquefier for low-temperature liquefied gas - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to a reliquefaction device for generated gas.

Conventionally, in low-temperature liquefied gas storage facilities, low-temperature liquefied gas is shipped and released at room temperature. Because of the lack of simultaneous reliquefaction of the raw gas, the cold energy of the shipping liquid could not be effectively used to reliquefy the generated gas.

The present invention was made in view of these circumstances, and it stores the cold energy during shipping of low-temperature liquefied gas and effectively uses it for reliquefaction of generated gas, and also indirectly performs the cold storage and reliquefaction through a heat medium. The purpose of this is to prevent staining of the heat transfer path of the container and improve maintenance.

Embodiments of the present invention will be described below with reference to the drawings.

Figure 1 shows an example of the present invention, in which two metal hydride containers (]) (2) are provided, and one container (1) has an equilibrium state as shown by the line (α) in Figure 3. A metal hydride having characteristics (- is charged, and the other container (2) is charged with a metal hydride [F] having equilibrium characteristics as shown by line (b)), and said container (1 ) (2) are connected by a hydrogen gas flow path (4) equipped with a valve (3), and the above container (]
) (2) has a flow path configuration in which heat is indirectly transferred to the metal hydride (5) (F3) in (2) via a heat medium.

A heat transfer path (5) and a pipe line (
6), drum (7), heat medium circulation pump (8), pipe line (
9), a heat exchanger (10), and a pipe line (1]) constitute a gas cooling flow path (12), and the cold heat stored in the container (+) is used to cool the heat exchanger (1). The generated gas from the low temperature storage tank (13) is introduced into 10) via the compressor (14) and pipe line (country) to re-liquefy it.
A generated gas flow path 08) is configured to return the generated gas to the tank (13) via a drum (16) and a return pump 07).

In this case, the circulating heat medium removes heat from the generated gas in the heat exchanger (10) and evaporates (or only the temperature increases without a phase change), and is cooled in the heat transfer path (5) of the container (1). condensation (or only temperature drop without phase change). Moreover, this condensate is pressurized by a pump (8) via a pipe line (6) and a drum (7), and is used for circulation.

In addition, the circulating heat medium pressurized by the pump (8) is transferred to the pipe 09), the heat transfer path (5) of the container (1), the pipe (20), the heat exchanger (21), and the drum (forced). By circulating,
It constitutes a cold storage channel fence that takes in the cold energy of the low-temperature shipping liquid. In this case, the shipping liquid pressurized by the shipping pump (c) from the low temperature storage tank (13) is introduced into the heat exchanger (21) via the pipe (c), where it is heated from the circulating heat medium. is taken away, the medium is condensed (or the temperature is lowered without phase change), the temperature of the medium itself is raised and sent to the shipping line (c), and the cooled circulating heat medium is pressurized by the pump (8),
It is introduced into the heat transfer path (5) of the container (1), cools the inside of the container (1), removes the heat of formation of the metal hydride (a), and
metal hydride (5) by promoting the inflow of hydrogen gas from 2).
).

On the other hand, the circulating heat medium used for cooling the container (1) is evaporated (or the temperature rises without a phase change) due to the heat input from the metal hydride (A), and is transferred to the heat exchanger via the pipe (20). e]
) and are used cyclically. In the diagram (a)
indicates a flow controller.

of the metal hydride in the container (2) (container (1)
), the metal hydride in the container (2) is The reaction is promoted by removing heat from (I3), and the heat carrier evaporates (or raises the temperature by 1) and flows through the pipe (I3).
It is guided to the heat exchanger 0[F] via 1), is cooled by the external medium 0→, condenses (or lowers the temperature), and is transferred to the drum (G) via pipes (B) and (C). 5,
It is pressurized by a pump (a) and used for circulation.

Furthermore, the decomposition of the metal hydride (13) in the container (2) (corresponding to the generation (cool storage) of metal hydride N in the container ()) is carried out by using a circulating heat medium pressurized by the pump (a). , conduit (c)
It is introduced into the heat exchanger 0 via @ (b), evaporated (or temperature raised) by the medium (g) from the outside, and the heated heat medium is passed through the pipe el) into the container ( The decomposition reaction is promoted by introducing the metal hydride into the heat transfer path (2) and heating the metal hydride (2).

Hydrogen gas generated by decomposition is sent to the container (1) to promote the production of metal hydride (5). In addition, the circulating heat medium that has been deprived of heat in the container (2) condenses (or decreases in temperature),
It is collected in a drum (g) via a pipe line 09), pressurized by a pump (a), and used for circulation.

In the above, if the generated gas reliquefaction operation and low-temperature liquid shipping operation are performed at the same time and the amount of cooling heat of the shipped liquid is larger than the generated gas reliquefaction amount, the circulating medium pressurized by the pump (8) is transferred to the pipe ( 9) to the heat exchanger (10) based on the flow rate controller (c) to perform reliquefaction by sending only the amount necessary for reliquefaction of the generated gas, while surplus circulation from the pump (8) The medium enters the heat transfer path (5) of the container (1) via the pipe (19), removes heat from the container (1), promotes the production of metal hydride (T), and then passes through the heat exchanger 00. ) is joined with the spent medium (from the pipe (11)) in the pipe (20), guided to the heat exchanger ■υ, cooled, and recycled for use.

In addition, if the amount of cooling heat of the low-temperature shipping liquid is less than the amount of heat of reliquefaction of the generated gas, the required amount of circulating medium pressurized by the pump (8) is guided to the heat exchanger (10) via the pipe (9). The heat transfer medium is used to reliquefy the generated gas, and the heat medium used is
1) Guided to heat exchanger al (via 20+) and cooled by shipping liquid. The amount of heat medium that cannot be cooled by the heat exchanger Q]) flows from the pipe (11) into the heat transfer path (5) of the container (1), and is decomposed by the decomposition reaction of the metal hydride (3). It is cooled by removing heat, passes through the pipe line (6), joins the heat medium cooled by the heat exchanger Q1) in the drum (7), and is circulated under pressure by the pump (8).

FIG. 2 shows another embodiment of the present invention, in which a container (1)
This figure shows the case where the heat transfer paths disposed through the gas cooling path (12) and the heat transfer path (41) for the cold storage flow path (a) are made independent, respectively. However, substantially the same effects as described above can be achieved. Items with the same reference numerals in the figures represent the same items.

According to the above-described low-temperature liquefied gas reliquefaction apparatus of the present invention,
The following excellent effects can be achieved.

(1) Cold heat can be stored during shipping of low-temperature liquefied gas and effectively used for re-liquefaction of generated gas.

(11) Since cold storage and reliquefaction are performed indirectly via the circulating heat medium, it is possible to prevent the heat transfer paths of the container etc. from becoming dirty and to facilitate maintenance.

0ii) Since the circulating heat medium is driven by a pump instead of a compressor, the energy saving effect is improved (7).

(1v) The shipping operation of the low-temperature liquefied gas and the reliquefaction operation of the generated gas can be carried out simultaneously or independently.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing one embodiment of the present invention, Fig. 2 is an explanatory diagram showing another embodiment of the present invention, and Fig. 5 is the relationship between equilibrium pressure and equilibrium temperature of the metal hydride used in the present invention. It is a graph showing an example. (]H2) is a metal hydride container, (4) is a hydrogen gas flow path, (5) @O) (41) is a heat transfer path, (10) is a heat exchanger, (12) is a gas cooling flow path, (13) is a low temperature storage tank, (18) is a generated gas flow path, Q→ is a heat exchanger, (a)
indicates the cold storage flow path, and (c) indicates the shipping line. Patent applicant Ishikawajima Harima Heavy Industries Co., Ltd. Patent applicant agent = Temperature

Claims (1)

[Claims] 1) A heat medium circulation channel consisting of a cold storage channel and a gas cooling channel is installed as a heat transfer channel in one of two containers that contain different types of metal hydrides and are connected to each other through a hydrogen gas channel. and connect the low temperature liquefied gas shipping line of the low temperature storage tank to the cold storage flow path through a heat exchanger, and connect the generated gas flow path provided in the low temperature storage tank through the heat exchanger. A reliquefaction device 0 for low-temperature liquefied gas, characterized in that it is connected to the gas cooling channel.