JP2017040296A - Gas vaporizer and method for operating the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas vaporizer and a method for operating the same which can improve heat exchange efficiency.SOLUTION: A gas vaporizer includes a first heat exchange part (10), and a second heat exchange part (20). The first heat exchange part (10) includes a first heat exchange panel (12), and the first heat exchange panel (12) includes a plurality of first heat transfer pipes (14), a first distribution header (16), and a first confluence header (18). The second heat exchange part (20) includes a second heat exchange panel (22), and the second heat exchange panel (22) includes a plurality of second heat transfer pipes (24), a second distribution header (26), and a second confluence header (28). The respective first heat transfer pipes (14) heat low temperature liquified gas until a total amount of the low temperature liquified gas is evaporated, and the number of the second heat transfer pipes (24) is set to be smaller than the number of the first heat transfer pipes (14).SELECTED DRAWING: Figure 1

Description

  The present invention relates to a gas vaporizer.

  Conventionally, a gas vaporizer (ORV) that vaporizes a low-temperature liquefied gas such as liquefied natural gas (LNG) using a heat source medium such as seawater is known. For example, in Patent Document 1, a plurality of vaporization tube panels, a supply-side manifold that supplies liquefied natural gas (LNG) to each vaporization tube panel, and natural gas (NG) that flows out from each vaporization tube panel are collected and sent out. There is disclosed a gas vaporizer comprising a delivery-side manifold. Each vaporization tube panel has a plurality of heat transfer tubes, a supply side header that distributes LNG to each heat transfer tube, and a delivery side header that joins NG flowing out from each heat transfer tube. Each heat transfer tube evaporates the LNG by exchanging heat between the LNG and the heat source medium, and further heats the NG generated by the evaporation.

JP 2012-2310 A

  In the gas vaporizer described in Patent Document 1, there is room for improvement in improving the heat exchange efficiency in each heat transfer tube. Specifically, the factors that affect the heat exchange efficiency in each heat transfer tube include the flow rate of NG in the heat transfer tube. In the gas vaporizer described in Patent Document 1, the NG of the heat transfer tube It is difficult to control the flow rate. The reason is as follows. That is, in this gas vaporizer, since both LNG evaporation and NG heating are performed in a single heat transfer tube, the flow rate of NG can be set or managed within a desired range in each heat transfer tube. It becomes difficult.

  The objective of this invention is providing the gas vaporizer which can improve a heat exchange efficiency, and its operating method.

  As means for solving the above-mentioned problems, the present invention includes a first heat exchange unit that heats the low-temperature liquefied gas, and a second heat exchange unit that further heats the low-temperature liquefied gas flowing out of the first heat exchange unit. The first heat exchange unit includes at least one first heat exchange panel, and each of the at least one first heat exchange panel exchanges heat between the low-temperature liquefied gas and the heat source medium. A plurality of first heat transfer tubes that heat the gas, a first distribution header that distributes the low-temperature liquefied gas to each first heat transfer tube, and a first merge that joins the low-temperature liquefied gas flowing out from each first heat transfer tube And the second heat exchange part includes at least one second heat exchange panel, and each of the at least one second heat exchange panel exchanges heat between the low-temperature liquefied gas and the heat source medium. To make A plurality of second heat transfer tubes for heating the low-temperature liquefied gas, a second distribution header for distributing the low-temperature liquefied gas to each second heat transfer tube, and the low-temperature liquefied gas flowing out from each second heat transfer tube Each of the first heat transfer tubes heats the low-temperature liquefied gas until the entire amount of the low-temperature liquefied gas evaporates, and the number of the second heat transfer tubes is the first heat transfer tube. Provided is a gas vaporizer which is set to be smaller than the number of heat transfer tubes.

  In this gas vaporizer, since the first heat exchange part and the second heat exchange part are separated, the low-temperature liquefied gas evaporates in the first heat exchange panel, and the gas is heated in the second heat exchange panel. Further, by designing the shape and the like of each heat transfer tube, the gas flow rate can be easily controlled. Furthermore, since the number of the second heat transfer tubes is smaller than the number of the first heat transfer tubes, that is, the sum of the cross-sectional areas of the plurality of second heat transfer tubes is greater than the sum of the cross-sectional areas of the plurality of first heat transfer tubes. Therefore, the flow rate of the low-temperature liquefied gas flowing in each second heat transfer tube is larger than the flow rate of the low-temperature liquefied gas flowing in each first heat transfer tube. Therefore, the heat exchange efficiency in each 2nd heat exchanger tube increases, and, thereby, the heat exchange efficiency as the whole apparatus improves.

  In this case, a first heat source medium supply unit that supplies the heat source medium to each first heat transfer tube, and a second heat source medium supply unit that supplies the heat source medium to each second heat transfer tube, The supply amount of the heat source medium to each first heat transfer tube by the one heat source medium supply unit is set to be larger than the supply amount of the heat source medium to each second heat transfer tube by the second heat source medium supply unit. It is preferable.

  In this way, since a relatively large amount of the heat source medium is supplied to each first heat transfer tube, the low-temperature liquefied gas is more reliably evaporated in the first heat exchange panel, and then the evaporation is caused by the evaporation. The gas is effectively warmed in the second heat exchange panel. For this reason, heat exchange efficiency increases more reliably.

  The present invention further includes a delivery manifold that connects the first heat exchange unit and the second heat exchange unit, wherein the at least one first heat exchange panel includes a plurality of first heat exchange panels. The at least one second heat exchange panel includes a plurality of second heat exchange panels, and the delivery manifold includes a plurality of first merge headers and the second heat included in the plurality of first heat exchange panels. It is preferable to have a shape that connects the exchange part.

  If it does in this way, all the low-temperature liquefied gas which flowed out from a plurality of 1st merge headers will flow into a 2nd heat exchange part collectively.

  In this case, the apparatus further includes an LPG supply unit that supplies LPG, which is a low-temperature liquefied gas different from the low-temperature liquefied gas, and the LPG supply unit includes the plurality of first heats in the delivery manifold among the delivery manifolds. The second heat located on the most upstream side of the plurality of second heat exchange panels in the delivery manifold and the connection portion of the first heat exchange panel located on the most downstream side of the exchange panel with the first merge header. It is preferable to be connected to a portion between the exchange panel and the connection portion with the second distribution header.

  In this way, since the LPG is supplied after the low-temperature liquefied gas has flowed out of the plurality of first merging headers and then merged in the delivery manifold, the LPG is supplied before the total amount of the low-temperature liquefied gas is merged. Compared to the case, LPG is efficiently mixed with the low-temperature liquefied gas.

  In the present invention, the second distribution header of the second heat exchange panel located on the most upstream side among the plurality of second heat exchange panels is connected to the delivery manifold, and each of the second heat exchange panels The second merge header is preferably connected to the second distribution header of the second heat exchange panel located one downstream of the second heat exchange panel.

  In this way, since the entire amount of the low-temperature liquefied gas supplied through the delivery manifold flows in series in each second heat exchange panel, the second distribution header of each second heat exchange panel is respectively connected to the delivery manifold. When connected in parallel, that is, when the low-temperature liquefied gas supplied through the delivery manifold is diverted to each second heat exchange panel, the flow velocity of the gas flowing in each second heat transfer tube is increased. Therefore, the heat exchange efficiency in the second heat exchange part is further increased.

  The present invention further includes a first heat exchange unit that heats the low-temperature liquefied gas, and a second heat exchange unit that further heats the low-temperature liquefied gas that has flowed out of the first heat exchange unit. A plurality of first heat transfer tubes that heat the low-temperature liquefied gas by exchanging heat between the low-temperature liquefied gas and the heat source medium, and a first portion that distributes the low-temperature liquefied gas to each first heat transfer tube. 1 distribution header and the 1st merge header which joins the low temperature liquefied gas which flowed out from each 1st heat exchanger tube, and each said 2nd heat exchange part heat-exchanges the said low temperature liquefied gas and a heat source medium. A plurality of second heat transfer tubes that heat the low-temperature liquefied gas, a second distribution header that distributes the low-temperature liquefied gas to each second heat transfer tube, and the low-temperature liquefied gas that has flowed out of each second heat transfer tube A second merge header that merges, A gas vaporizer operating method comprising: a low-temperature liquefied gas supply step for supplying the low-temperature liquefied gas to the first distribution header; and a heat source for supplying a heat source medium to each first heat transfer tube and each second heat transfer tube Medium supply step, and in the heat source medium supply step, the total amount of the low-temperature liquefied gas is evaporated in each first heat transfer tube, and the gas is heated in each second heat transfer tube. Provided is a gas vaporizer operating method for supplying the heat source medium to each first heat transfer tube and each second heat transfer tube.

  In this method, it is possible to easily control the gas flow rate in the second heat transfer tube, that is, to improve the heat exchange efficiency of the entire apparatus.

  Specifically, in the heat source medium supplying step, each first heat transfer tube and each of the first heat transfer tubes and each of the heat transfer medium supply steps are configured such that the flow rate of the low-temperature liquefied gas flowing through each second heat transfer tube is larger than the flow rate of the low-temperature liquefied gas flowing through each first heat transfer tube. It is preferable to supply the heat source medium to the second heat transfer tube.

  If it does in this way, the heat exchange efficiency in each 2nd heat exchanger tube will increase, and, thereby, the heat exchange efficiency as the whole apparatus improves.

  As described above, according to the present invention, it is possible to provide a gas vaporizer capable of improving heat exchange efficiency and an operation method thereof.

It is a figure which shows the outline of a structure of the gas vaporizer of one Embodiment of this invention. It is a side view of the gas vaporization apparatus shown by FIG. It is a figure which shows the positional relationship of a seawater trough and each heat exchanger tube. It is a figure which shows the modification of the gas vaporizer shown by FIG.

  A gas vaporizer according to an embodiment of the present invention will be described with reference to FIGS. This gas vaporizer is an apparatus that vaporizes the low-temperature liquefied gas by exchanging heat between the low-temperature liquefied gas and the heat source medium. In the present embodiment, liquefied natural gas (LNG) is used as the low-temperature liquefied gas, and seawater is used as the heat source medium. That is, this gas vaporizer is a so-called open rack vaporizer (ORV) that vaporizes LNG by exchanging heat between LNG and seawater.

  As shown in FIG. 1, the gas vaporizer includes a first heat exchange unit 10, a second heat exchange unit 20, an LNG supply unit 42, an NG recovery unit 44, and a heat source medium supply unit 50. I have. In FIG. 1, the heat source medium supply unit 50 is not shown.

  The first heat exchange unit 10 heats the low-temperature liquefied gas (LNG in this embodiment). The first heat exchange unit 10 has a plurality of (three in this embodiment) first heat exchange panels 12. Each first heat exchange panel 12 includes a plurality of first heat transfer tubes 14, a first distribution header 16, and a first merge header 18.

  Each 1st heat exchanger tube 14 heats LNG by heat-exchanging LNG and a heat source medium (this embodiment seawater). Each first heat transfer tube 14 heats the LNG until the entire amount of LNG evaporates (becomes NG). Each first heat transfer tube 14 is arranged in a posture in which the axial direction of the first heat transfer tube 14 is parallel to the vertical direction. The plurality of first heat transfer tubes 14 are arranged in a line along a direction orthogonal to the axial direction of each first heat transfer tube 14.

  The first distribution header 16 is connected to the lower end portion of each first heat transfer tube 14 so that LNG can be distributed to each first heat transfer tube 14. The first distribution header 16 is arranged in a posture in which the axial direction of the first distribution header 16 is parallel to the horizontal direction.

  The first merge header 18 is connected to the upper end of each first heat transfer tube 14 so that NG flowing out from each first heat transfer tube 14 can be merged. The first merge header 18 is arranged in a posture that is parallel to the first distribution header 16.

  In the present embodiment, a supply manifold 32 for distributing LNG in each first distribution header 16 is connected to one end of each first distribution header 16, and one end of each first merge header 18 is connected to one end of each first distribution header 16. Is connected to a delivery manifold 34 that joins the NG flowing out from the first joining header 18 and sends it to the second heat exchange unit 20. That is, each first heat exchange panel 12 is connected to the supply manifold 32 and the delivery manifold 34 in parallel. Connected to the supply manifold 32 is an LNG supply unit 42 for supplying LNG. In the present embodiment, the first heat exchanging unit 10 indicates a site downstream of the supply manifold 32 and upstream of the delivery manifold 34.

  The second heat exchanging unit 20 further heats the NG that has flowed out from the first joining headers 18 of the first heat exchanging unit 10. The second heat exchange unit 20 includes a plurality of (two in the present embodiment) second heat exchange panels 22. The shape of the second heat exchange panel 22 is the same as that of the first heat exchange panel 12. That is, each second heat exchange panel 22 includes a plurality of second heat transfer tubes 24, a second distribution header 26, and a second merge header 28. In the present embodiment, the number of second heat exchange panels 22 is set to be smaller than the number of first heat exchange panels 12. In other words, the number of the second heat transfer tubes 24 is set to be smaller than the number of the first heat transfer tubes 14.

  Each 2nd heat exchanger tube 24 heats NG by heat-exchanging NG and a heat source medium (this embodiment seawater). Each of the second heat transfer tubes 24 is arranged in such a posture that the axial direction of the second heat transfer tubes 24 is parallel to the vertical direction. The plurality of second heat transfer tubes 24 are arranged in a line along a direction parallel to the direction in which the plurality of first heat transfer tubes 14 included in the first heat exchange panel 12 are arranged.

  The second distribution header 26 is connected to the end of each second heat transfer tube 24 so that NG can be distributed to each second heat transfer tube 24. The second distribution header 26 is arranged in a posture that is parallel to the first distribution header 16 and the first merge header 18.

  The second merge header 28 is connected to the end of each second heat transfer tube 24 so that NG flowing out from each second heat transfer tube 24 can be merged. The second merge header 28 is arranged in a posture that is parallel to the second distribution header 26.

  In the present embodiment, the second distribution header 26 of the second heat exchange panel 22 located on the upstream side among the plurality of second heat exchange panels 22 is the upper end of each second heat transfer tube 24 of the second heat exchange panel 22. The second joining header 28 of the second heat exchange panel 22 is connected to the lower end of each second heat transfer tube 24 of the second heat exchange panel 22. One end of the second distribution header 26 of the second heat exchange panel 22 located on the upstream side is connected to the downstream end of the delivery manifold 34. The second distribution header 26 of the second heat exchange panel 22 located on the downstream side of the plurality of second heat exchange panels 22 is connected to the lower end of each second heat transfer tube 24 of the second heat exchange panel 22. The second joining header 28 of the second heat exchange panel 22 is connected to the upper end of each second heat transfer tube 24 of the second heat exchange panel 22. The second joining header 28 of the second heat exchange panel 22 located on the upstream side and the second distribution header 26 of the second heat exchange panel 22 located on the downstream side are connected by a connecting pipe 36. . That is, the second heat exchange panels 22 are connected to the delivery manifold 34 so as to be arranged in series. NG that has flowed out from the second merge header 28 of the second heat exchange panel 22 located on the most downstream side among the plurality of second heat exchange panels 22 is collected through the NG collection unit 44 connected to the second merge header 28. Is done.

  In the present embodiment, an LPG supply unit 46 that supplies (sprays) liquefied petroleum gas (LPG) is connected to the delivery manifold 34. More specifically, as shown in FIG. 1, the LPG supply unit 46 includes the first heat exchange panel 12 of the first heat exchange panel 12 located on the most downstream side of the plurality of first heat exchange panels 12 in the delivery manifold 34. A connection portion between one joining header 18 and the delivery manifold 34 and a connection portion between the second distribution header 26 and the delivery manifold 34 of the second heat exchange panel 22 located on the most upstream side among the plurality of second heat exchange panels 22. It is connected to the part between. The LPG is supplied to adjust the amount of heat of NG recovered from the NG recovery unit 44.

  As shown in FIGS. 2 and 3, the heat source medium supply unit 50 includes a plurality of seawater troughs 52 that supply seawater to the first heat transfer tubes 14 and the second heat transfer tubes 24, and seawater to each seawater trough 52. A seawater supply channel 54 for supplying seawater and a seawater manifold 56 for distributing seawater to each seawater supply channel 54 are provided.

  Each seawater trough 52 is arranged in the vicinity of the upper end of each heat transfer tube 14, 24 so that seawater flows down along the surface of each heat transfer tube 14, 24. The seawater supplied from the seawater trough 52 heats the LNG flowing through the first heat transfer tubes 14 and the NG flowing through the second heat transfer tubes 24.

  Each seawater supply channel 54 is provided with a valve V. By adjusting the opening degree of the valve V, the amount of seawater supplied to the heat transfer tubes 14 and 24 is adjusted. That is, the seawater trough 52 for supplying seawater to each first heat transfer tube 14, the seawater supply channel 54 connected to the seawater trough 52, and the valve V provided in the seawater supply channel 54 are respectively A “first heat source medium supply unit” that can adjust the amount of seawater supplied to the heat transfer tubes 14 is configured. Similarly, a seawater trough 52 for supplying seawater to each second heat transfer tube 24, a seawater supply channel 54 connected to the seawater trough 52, and a valve V provided in the seawater supply channel 54 are respectively 2 A “second heat source medium supply unit” capable of adjusting the amount of seawater supplied to the heat transfer tubes 24 is configured. In the present embodiment, the amount of seawater supplied to each first heat transfer tube 14 by the first heat source medium supply unit is larger than the amount of seawater supplied to each second heat transfer tube 24 by the second heat source medium supply unit. It is set to be. Specifically, the opening degree of the valve V of the first heat source medium supply unit is set larger than the opening degree of the valve V of the second heat source medium supply unit.

  In the present embodiment, the LNG supplied to the first heat exchange panel 12 flows out of the first heat exchange panel 12 in a state (degree of NG) that is equal to or higher than the dew point temperature, and the NG is the second heat exchange panel 22. The shape of each of the heat transfer tubes 14 and 24 and the opening degree of the valve V are set so as to be heated at.

  As described above, in the gas vaporizer, since the first heat exchange unit 10 and the second heat exchange unit 20 are separated, LNG evaporates in the first heat exchange panel 12, and the second heat exchange panel 22. By designing the shape and the like of the heat transfer tubes 14 and 24 so that the NG is heated, it becomes possible to easily control the flow rate of the NG. Furthermore, since the number of the second heat transfer tubes 24 is smaller than the number of the first heat transfer tubes 14, that is, the sum of the cross-sectional areas of the plurality of second heat transfer tubes 24 is the disconnection of the plurality of first heat transfer tubes 14. Since the total area is smaller, the flow rate of NG flowing in each second heat transfer tube 24 is larger than the flow rate of LNG flowing in each first heat transfer tube 14. Therefore, the heat exchange efficiency in each 2nd heat exchanger tube 24 increases, and, thereby, the heat exchange efficiency as the whole apparatus improves.

  In this embodiment, the amount of seawater supplied to each first heat transfer tube 14 by the first heat source medium supply unit is greater than the amount of seawater supplied to each second heat transfer tube 24 by the second heat source medium supply unit. Also set to be more. That is, a relatively large amount of seawater is distributed to each first heat transfer tube 14. Therefore, LNG evaporates more reliably in the first heat exchange panel 12, and then NG generated by the evaporation is effectively heated in the second heat exchange panel 22. For this reason, heat exchange efficiency increases more reliably.

  Further, in the present embodiment, the LPG supply unit 46 includes a connection portion of the delivery manifold 34 to the first merging header 18 of the first heat exchange panel 12 located on the most downstream side in the delivery manifold 34, and the delivery manifold. 34 is connected to a portion between the second distribution header 26 of the second heat exchange panel 22 located on the most upstream side in the portion 34. For this reason, after the low-temperature liquefied gas flows out of the plurality of first merging headers 18, the entire amount is merged in the delivery manifold 34 and then LPG is supplied. Therefore, compared with the case where LPG is supplied before the total amount of NG flowing out from the plurality of first joining headers 18 joins, LPG is efficiently mixed with NG.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  For example, the number of the 1st heat exchange panels 12 and the number of the 2nd heat exchange panels 22 are not restricted to said example. As long as the number of second heat exchange panels 22 satisfies a condition that is less than the number of first heat exchange panels 12, the number of heat exchange panels 12 and 22 can be set as appropriate. Furthermore, the first heat exchange unit 10 and the second heat exchange unit 20 are each configured by a single heat exchange panel, and the number of second heat transfer tubes 24 included in the second heat exchange panel 22 is the first heat exchange. The number may be set to be less than the number of the first heat transfer tubes 14 included in the panel 12.

  In the above embodiment, an example is shown in which each second heat exchange panel 22 is connected in series with the delivery manifold 34. However, as shown in FIG. The panel 22 may be connected to be parallel to the delivery manifold 34. However, when the second heat exchange panels 22 are connected to be arranged in series with the delivery manifold 34, the second heat exchange panels 22 are connected to be arranged in parallel with the delivery manifold 34. In other words, the flow rate of NG flowing through each second heat transfer tube 24 is greater than when NG is diverted from the delivery manifold 34 to each second heat exchange panel 22. Therefore, the heat exchange efficiency in the 2nd heat exchange part 20 becomes still higher.

DESCRIPTION OF SYMBOLS 10 1st heat exchange part 12 1st heat exchange panel 14 1st heat exchanger tube 16 1st distribution header 18 1st merge header 20 2nd heat exchange part 22 2nd heat exchange panel 24 2nd heat exchanger tube 26 2nd distribution header 28 Second merge header 32 Supply manifold 34 Delivery manifold 36 Connection pipe 42 LNG supply unit 44 NG recovery unit 46 LPG supply unit 50 Heat source medium supply unit

Claims (7)

A first heat exchange section for heating the low-temperature liquefied gas;
A second heat exchange part for further heating the low-temperature liquefied gas flowing out from the first heat exchange part,
The first heat exchange unit includes at least one first heat exchange panel;
The at least one first heat exchange panel includes:
A plurality of first heat transfer tubes, each of which heats the low-temperature liquefied gas by exchanging heat between the low-temperature liquefied gas and the heat source medium;
A first distribution header that distributes the cryogenic liquefied gas to each first heat transfer tube;
A first merge header that merges the low-temperature liquefied gas flowing out from each first heat transfer tube,
The second heat exchange unit includes at least one second heat exchange panel;
The at least one second heat exchange panel includes:
A plurality of second heat transfer tubes each for heating the low-temperature liquefied gas by exchanging heat between the low-temperature liquefied gas and the heat source medium;
A second distribution header for distributing the low-temperature liquefied gas to each second heat transfer tube;
A second merge header that merges the low-temperature liquefied gas flowing out from each second heat transfer tube,
Each first heat transfer tube heats the low-temperature liquefied gas until the entire amount of the low-temperature liquefied gas is evaporated,
The gas vaporizer, wherein the number of the second heat transfer tubes is set to be smaller than the number of the first heat transfer tubes. The gas vaporizer according to claim 1,
A first heat source medium supply unit for supplying the heat source medium to each first heat transfer tube;
A second heat source medium supply unit for supplying the heat source medium to each second heat transfer tube,
The supply amount of the heat source medium to each first heat transfer tube by the first heat source medium supply unit is larger than the supply amount of the heat source medium to each second heat transfer tube by the second heat source medium supply unit. Gas vaporizer that is set. The gas vaporizer according to claim 1 or 2,
A delivery manifold connecting the first heat exchange unit and the second heat exchange unit;
The at least one first heat exchange panel has a plurality of first heat exchange panels;
The at least one second heat exchange panel has a plurality of second heat exchange panels;
The gas supply apparatus, wherein the delivery manifold has a shape that connects a plurality of first joining headers included in the plurality of first heat exchange panels and the second heat exchange unit. The gas vaporizer according to claim 3, wherein
An LPG supply unit for supplying LPG, which is a low temperature liquefied gas different from the low temperature liquefied gas,
The LPG supply unit includes, in the delivery manifold, a connection site with a first joining header of a first heat exchange panel located on the most downstream side of the plurality of first heat exchange panels in the delivery manifold, The gas vaporizer connected to the site | part between the connection part with the 2nd distribution header of the 2nd heat exchange panel located in the most upstream among the said 2nd heat exchange panels in a delivery manifold. The gas vaporizer according to claim 3 or 4,
The second distribution header of the second heat exchange panel located on the most upstream side among the plurality of second heat exchange panels is connected to the delivery manifold,
The gas vaporizer, wherein the second merge header of each second heat exchange panel is connected to the second distribution header of the second heat exchange panel located one downstream of the second heat exchange panel. A first heat exchange unit that heats the low-temperature liquefied gas; and a second heat exchange unit that further heats the low-temperature liquefied gas that has flowed out of the first heat exchange unit. A plurality of first heat transfer tubes that heat the low-temperature liquefied gas by exchanging heat between the low-temperature liquefied gas and the heat source medium; a first distribution header that distributes the low-temperature liquefied gas to each first heat transfer tube; A first merging header that merges the low-temperature liquefied gas flowing out from the first heat transfer tube, and the second heat exchanging unit heat-exchanges the low-temperature liquefied gas and the heat source medium, respectively. A plurality of second heat transfer tubes that heat the gas, a second distribution header that distributes the low-temperature liquefied gas to each second heat transfer tube, and a second merge that combines the low-temperature liquefied gas flowing out from each second heat transfer tube A header, having a gas A method of operating the apparatus,
A low-temperature liquefied gas supply step of supplying the low-temperature liquefied gas to the first distribution header;
A heat source medium supply step of supplying a heat source medium to each first heat transfer tube and each second heat transfer tube,
In the heat source medium supplying step, each first heat transfer tube and each first heat transfer tube are heated so that the entire amount of the low-temperature liquefied gas evaporates in each first heat transfer tube and the gas is heated in each second heat transfer tube. (2) A gas vaporizer operating method for supplying the heat source medium to a heat transfer tube. In the operation method of the gas vaporizer according to claim 6,
In the heat source medium supplying step, each first heat transfer tube and each second heat transfer tube are configured such that the flow rate of the low-temperature liquefied gas flowing through each second heat transfer tube is larger than the flow rate of the low-temperature liquefied gas flowing through each first heat transfer tube. A gas vaporizer operating method for supplying the heat source medium to

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