WO2021235337A1

WO2021235337A1 - Intermediate-medium heat exchanger

Info

Publication number: WO2021235337A1
Application number: PCT/JP2021/018370
Authority: WO
Inventors: 孝祐東
Original assignee: 株式会社神戸製鋼所
Priority date: 2020-05-22
Filing date: 2021-05-14
Publication date: 2021-11-25

Abstract

This intermediate-medium heat exchanger comprises: an intermediate-medium evaporator having a first chamber and a first heat transfer tube; a liquefied gas vaporizer having a second chamber and a second heat transfer tube; a first communication pipe; and a second communication pipe. An intermediate medium is enclosed in the space of the intermediate-medium heat exchanger. The first communication pipe has a first vaporizer-side opening and a first evaporator-side opening. The second communication pipe has a second vaporizer-side opening that opens at a position below the liquid level of the liquid intermediate medium in the second chamber, a second evaporator-side opening that opens into the first chamber, and a liquid reservoir that stores the liquid intermediate medium and seals the second communication pipe.

Description

Intermediate medium heat exchanger

The present invention relates to an intermediate medium type heat exchanger.

Conventionally, as disclosed in Patent Document 1, an intermediate medium type heat exchanger that vaporizes a low-temperature liquefied gas such as liquefied natural gas (LNG; Liquidied Natural Gas) is known. The intermediate medium type heat exchanger transfers heat from the heat source medium to the low temperature liquefied gas via the intermediate medium while circulating the intermediate medium.

As shown in FIG. 10, the intermediate medium type heat exchanger disclosed in Patent Document 1 has a configuration including a chamber 80 which is a casing for accommodating the intermediate medium, and

heat transfer tubes

88 and 93. It has an intermediate medium evaporation unit 81 and an LNG vaporization unit 82.

Specifically, the intermediate medium evaporating unit 81 includes a lower portion 80b of the chamber 80 and a straight tubular heat transfer tube 88 passing through the lower portion 80b. The LNG vaporization unit 82 includes an upper portion 80t of the chamber 80 and a U-shaped heat transfer tube 93 passing through the upper portion 80t. The lower 80b and the upper 80t form one chamber 80. An intermediate medium is enclosed in the chamber 80. Seawater, which is a heat source medium, flows through the heat transfer tube 88. LNG flows through the heat transfer tube 93. The intermediate medium accumulated in the chamber 80 is heated by seawater via the heat transfer tube 88 to become a gaseous intermediate medium GM. The gaseous intermediate medium GM is cooled by LNG via the heat transfer tube 93 to become a liquid intermediate medium LM. In this way, the intermediate medium circulates in the chamber 80 while undergoing a phase transition between the gas and the liquid.

The intermediate medium type heat exchanger is composed of one chamber 80 which is a casing for accommodating the intermediate medium, a heat transfer tube 88 passed through the upper 80t thereof, and 93 passed through the lower 80b. Therefore, the intermediate medium type heat exchanger cannot be manufactured by a general-purpose shell-and-tube heat exchanger, and must be specially designed and manufactured. Therefore, the cost increases.

JP-A-2017-120125

An object of the present invention is to provide an intermediate medium type heat exchanger capable of suppressing costs.

In order to achieve the above object, the present inventors have separate 2 parts for the LNG vaporizer (hereinafter referred to as "liquefied gas vaporizer") and the intermediate medium evaporator (hereinafter referred to as "intermediate medium evaporator"). We decided to use two shell-and-tube heat exchangers. Then, the two shell-and-tube heat exchangers (liquefied gas vaporizer and intermediate medium evaporator) are communicated with each other by the first communication pipe and the second communication pipe.

However, in this configuration, the liquid intermediate medium flows from the liquefied gas vaporizer to the intermediate medium evaporator through the second communication pipe, but the gaseous intermediate medium vaporized by the intermediate medium evaporator becomes the second communication pipe. There is a risk of flowing in. That is, there is a possibility that a phenomenon in which the flow of the liquid intermediate medium in the second communication pipe is obstructed by the gaseous intermediate medium, that is, a so-called flooding phenomenon occurs. Due to this phenomenon, the circulation amount of the intermediate medium in the entire intermediate medium type heat exchanger may decrease, and the performance of the intermediate medium type heat exchanger may decrease.

Therefore, the present inventors have come up with the idea of sealing the second communication pipe with liquid or providing an inflow restraining member. Specifically, it is as follows.

The intermediate medium type heat exchanger according to one aspect of the present invention has a hollow first chamber and a first heat transfer tube arranged so as to pass through the first chamber and into which a heat source medium flows. An intermediate medium evaporator, a hollow second chamber arranged below the first chamber, and a second chamber arranged so as to pass through the second chamber and into which the low temperature liquefied gas flows. A liquefied gas vaporizer having a heat transfer tube, a first communication tube that communicates with each other in the first chamber and the second chamber, and in the first chamber and the second chamber. It is provided with a second communication pipe that communicates with the inside. An intermediate medium is enclosed in the space provided by the first chamber, the second chamber, the first communication pipe, and the second communication pipe. The liquid intermediate medium in the first chamber is heated by the heat source medium via the first heat transfer tube and vaporized to become a gaseous intermediate medium. The gaseous intermediate medium in the second chamber is cooled and condensed by the cryogenic liquefied gas via the second heat transfer tube to become a liquid intermediate medium. The first communication pipe has a first vaporizer-side opening that opens at a position above the liquid level of the liquid intermediate medium in the second chamber, and the liquid in the first chamber. It has a first evaporator-side opening that opens at a position above the liquid level of the intermediate medium. The second communication pipe opens in the first chamber with a second vaporizer-side opening that opens at a position below the liquid level of the liquid intermediate medium in the second chamber. It has a second evaporator side opening and a liquid reservoir for storing the liquid intermediate medium and sealing the second communication pipe.

Further, the intermediate medium type heat exchanger according to another aspect of the present invention is arranged so as to pass through the hollow first chamber and the first chamber, and the heat source medium flows into the first transfer. An intermediate medium evaporator having a heat pipe, a hollow second chamber arranged above the first chamber, and a low temperature liquefied gas arranged to pass through the second chamber flow in. A liquefied gas vaporizer having a second heat transfer tube, a first communication tube that communicates with each other in the first chamber and the second chamber, and the inside of the first chamber and the above. It is provided with a second communication pipe that communicates with the inside of the second chamber. An intermediate medium is enclosed in the space provided by the first chamber, the second chamber, the first communication pipe, and the second communication pipe. The liquid intermediate medium in the first chamber is heated by the heat source medium via the first heat transfer tube and vaporized to become a gaseous intermediate medium. The gaseous intermediate medium in the second chamber is cooled and condensed by the cryogenic liquefied gas via the second heat transfer tube to become a liquid intermediate medium. The first communication pipe has a first vaporizer-side opening that opens at a position above the liquid level of the liquid intermediate medium in the second chamber, and the liquid in the first chamber. It has a first evaporator-side opening that opens at a position above the liquid level of the intermediate medium. The second communication pipe has a second vaporizer-side opening that opens at a position below the liquid level of the liquid intermediate medium in the second chamber, and the liquid in the first chamber. It has a second evaporator side opening that opens at a position below the liquid level of the intermediate medium and at a position above the first heat transfer tube. The intermediate medium evaporator further includes an inflow suppressing member that prevents the gaseous intermediate medium in the first chamber from flowing into the second communication pipe through the second evaporator side opening.

It is a front sectional view which shows the intermediate medium type heat exchanger which concerns on 1st Embodiment. It is a side sectional view which shows the intermediate medium type heat exchanger which concerns on 1st Embodiment, and is the II-II line sectional drawing of FIG. It is a front sectional view which shows the modification of the liquid reservoir part which concerns on 1st Embodiment. It is a front sectional view which shows the intermediate medium type heat exchanger which concerns on the modification of 1st Embodiment. It is a front sectional view which shows the intermediate medium type heat exchanger which concerns on 2nd Embodiment. It is a side sectional view which shows the intermediate medium type heat exchanger which concerns on 2nd Embodiment, and is the VV line sectional drawing of FIG. It is a partially enlarged view around the inflow restraining member of FIG. It is a front sectional view which shows the modification of the inflow restraining member which concerns on 2nd Embodiment. It is a front sectional view which shows the intermediate medium type heat exchanger which concerns on the modification of 2nd Embodiment. It is a front sectional view which shows the conventional intermediate medium type heat exchanger.

Embodiment

Hereinafter, embodiments will be described with reference to the attached drawings. It should be noted that the following embodiments are examples that embody the present invention and do not limit the technical scope of the present invention.

The intermediate medium type heat exchanger 1 according to the first embodiment will be described with reference to FIGS. 1 and 2. In the present specification, "one side in the longitudinal direction" means the left side of FIGS. 1 and 4, and "the other side in the longitudinal direction" means the right side of FIGS. 1 and 4. do.

(First Embodiment)
The intermediate medium type heat exchanger 1 is a heat exchanger that exchanges heat between a heat source medium and a low-temperature liquefied gas via an intermediate medium. The intermediate medium type heat exchanger 1 transfers the heat of the heat source medium to the liquefied natural gas (LNG) via the intermediate medium while circulating the intermediate medium. As a result, LNG is vaporized to generate natural gas (NG). The intermediate medium type heat exchanger 1 is not limited to a configuration that vaporizes LNG as a low-temperature liquefied gas, and may be, for example, one that vaporizes ethylene, liquefied oxygen, liquefied nitrogen, or the like. The heat source medium is seawater, industrial water, or the like.

The intermediate medium type heat exchanger 1 includes an intermediate medium evaporator E1, a liquefied gas vaporizer E2, a first communication pipe 30, and a second communication pipe 40. The intermediate medium heat exchanger 1 has a closed space formed by an intermediate medium evaporator E1, a liquefied gas vaporizer E2, a first communication pipe 30 and a second communication pipe 40. An intermediate medium is enclosed in this space.

The intermediate medium evaporator E1 is composed of a shell-and-tube type heat exchanger. That is, the intermediate medium evaporator E1 is arranged so as to pass through the hollow chamber (first chamber) 10c whose longitudinal direction is horizontal and the first chamber 10c, and the heat source medium flows into the first chamber. It has a heat transfer tube 10d and. The intermediate medium evaporator E1 exchanges heat between the heat source medium and the liquid intermediate medium LM. In the intermediate medium evaporator E1, the heat from the heat source medium is transferred to the intermediate medium to evaporate the liquid intermediate medium LM. This produces a gaseous intermediate medium GM.

As shown in FIG. 1, the first heat transfer tube 10d has a straight tube shape and is arranged so as to pass through a lower (bottom side) portion in the first chamber 10c. The first heat transfer tube 10d penetrates the first chamber 10c in the longitudinal direction thereof. Then, in the first heat transfer tube 10d, seawater, which is a heat source medium, flows in from the left side of FIG. 1 and flows out to the right side of FIG. As shown in FIG. 2, a plurality of first heat transfer tubes 10d are provided.

As shown in FIGS. 1 and 2, a liquid intermediate medium LM is accumulated in the first chamber 10c in the operating state of the intermediate medium type heat exchanger 1. The first heat transfer tube 10d is immersed in the liquid intermediate medium LM accumulated in the first chamber 10c.

The liquefied gas vaporizer E2 is composed of a shell-and-tube type heat exchanger. That is, the liquefied gas vaporizer E2 passes through the hollow chamber (second chamber) 20c arranged above the first chamber 10c and having the longitudinal direction horizontal, and the inside of the second chamber 20c. It has a second heat transfer tube 20d, which is arranged in and into which the low temperature liquefied gas flows. The liquefied gas vaporizer E2 exchanges heat between the gaseous intermediate medium GM and the low temperature liquefied gas. In the liquefied gas vaporizer E2, the heat of the gaseous intermediate medium GM is transferred to the low temperature liquefied gas to vaporize the low temperature liquefied gas.

As shown in FIG. 1, the second heat transfer tube 20d has a U-shape and is arranged so as to pass through the second chamber 20c at a distance from the bottom of the second chamber 20c. Has been done. Specifically, one end of the second heat transfer tube 20d is connected to one side wall portion in the longitudinal direction of the second chamber 20c, and extends to the vicinity of the other side wall portion in the longitudinal direction of the second chamber 20c. The second heat transfer tube 20d is folded back so as to bend in the vicinity of the other side wall portion in the longitudinal direction, and the other end is connected to the one side wall portion in the longitudinal direction of the second chamber 20c. As shown in FIG. 2, a plurality of second heat transfer tubes 20d are provided. The second heat transfer tube 20d is not limited to the one having a U-shape, and may be a straight tubular one.

In the second chamber 20c, the gaseous intermediate medium GM and the liquid intermediate medium LM are accumulated as shown in FIGS. 1 and 2 in the operating state of the intermediate medium type heat exchanger 1. The second heat transfer tube 20d is arranged above the liquid intermediate medium LM accumulated in the second chamber 20c.

The first communication pipe 30 is a pipe that communicates with each other in the first chamber 10c and in the second chamber 20c. The lower end of the first communication pipe 30 is connected to the first chamber 10c, and the upper end is connected to the second chamber 20c. The upper end of the first communication pipe 30 is connected to the second chamber 20c at a position above the liquid level of the liquid intermediate medium LM in the second chamber 20c. The upper end of the first communication pipe 30 has a first vaporizer side opening 32 that opens at a position separated upward from the liquid surface of the liquid intermediate medium LM in the second chamber 20c. The lower end of the first communication pipe 30 is connected to the first chamber 10c at a position above the liquid level of the liquid intermediate medium in the first chamber 10c. The lower end of the first communication pipe 30 has a first evaporator side opening 31 that opens at a position separated upward from the liquid surface of the liquid intermediate medium in the first chamber 10c. Although one first communication pipe 30 is shown in FIG. 1, a plurality of first communication pipes 30 may be provided.

The second communication pipe 40 is a pipe that communicates with each other in the first chamber 10c and in the second chamber 20c. The lower end of the second communication pipe 40 is connected to the first chamber 10c, and the upper end is connected to the second chamber 20c. The upper end of the second communication pipe 40 is located in the second chamber 20c at a position separated downward from the liquid level of the liquid intermediate medium LM (a position immersed in the liquid intermediate medium LM) in the second chamber 20c. It is connected. The upper end of the second communication pipe 40 has a second vaporizer side opening 42 that opens downward from the liquid surface of the liquid intermediate medium LM in the second chamber 20c. The lower end of the second communication pipe 40 is connected to the first chamber 10c at a position above the liquid level of the liquid intermediate medium LM in the first chamber 10c. The lower end of the second communication pipe 40 has a second evaporator side opening 41 that opens at a position separated upward from the liquid surface of the liquid intermediate medium LM in the first chamber 10c. Although one second communication pipe 40 is shown in FIG. 1, a plurality of second communication pipes 40 may be provided. Further, the lower end of the second communication pipe 40 may be connected to the first chamber 10c at a position separated downward from the liquid level of the liquid intermediate medium LM in the first chamber 10c. That is, the position of the second evaporator side opening 41 may be any position in the first chamber 10c.

The second communication pipe 40 has an upper pipe portion 43 extending downward from the second vaporizer side opening 42 (that is, toward the first chamber 10c) and an upper pipe portion 43 extending upward (that is, from the second evaporator side opening 41). It has a lower pipe portion 45 extending (toward the second chamber 20c) and a liquid reservoir 44 in which the liquid intermediate medium LM is stored and the second communication pipe 40 is sealed.

The upper pipe portion 43 is a pipe extending straight downward from the bottom surface of the second chamber 20c between the bottom surface of the second chamber 20c and the top surface of the first chamber 10c. The second vaporizer side opening 42 of the upper pipe portion 43 is formed on the bottom surface of the second chamber 20c. The upper pipe portion 43 has a lower end portion 431 which is an opening on the opposite side of the second vaporizer side opening 42 and forms a lower opening. The upper pipe portion 43 receives the liquid intermediate medium LM once accumulated in the second chamber 20c from the second vaporizer side opening 42 and flows it downward.

The lower pipe portion 45 is a pipe extending straight upward from the top surface of the first chamber 10c between the bottom surface of the second chamber 20c and the top surface of the first chamber 10c. The second evaporator side opening 41 of the lower pipe portion 45 is formed on the top surface of the first chamber 10c. The lower pipe portion 45 has an upper end portion 452 which is an opening on the opposite side of the second evaporator side opening 41 and forms an upper opening. The upper end portion 452 of the lower pipe portion 45 is located above the lower end portion 431 of the upper pipe portion 43. The lower pipe portion 45 guides the liquid intermediate medium LM temporarily stored in the liquid reservoir portion 44 into the first chamber 10c.

The liquid reservoir 44 is composed of a bent pipe, and connects the lower end portion 431 of the upper pipe portion 43 and the upper end portion 452 of the lower pipe portion 45.

As shown in FIG. 1, the liquid reservoir 44 is a tube formed in a shape that bends in a substantially S shape, and has a bottom portion 44b that is a lower bending portion and a top portion 44t that is an upper bending portion. ,have.

The bottom portion 44b is connected to the lower end portion 431 of the upper pipe portion 43. That is, the bottom portion 44b is a substantially U-shaped pipe portion having a shape that is connected to the lower end portion 431 in a state of facing downward from the lower end portion 431 and bends to change the direction upward. As a result, the bottom surface of the bottom portion 44b is located below the lower end portion 431 of the upper pipe portion 43 and has a downwardly convex shape. The bottom portion 44b forms a space for storing the liquid intermediate medium LM.

The top portion 44t is connected to the upper end portion 452 of the lower pipe portion 45. That is, the top portion 44t is a substantially U-shaped tube portion that is connected to the upper end portion 452 in a state of facing upward from the upper end portion 452 and is bent upward to change its direction downward, and is a bottom portion 44b. It is connected to. The top portion 44t forms a space for guiding the liquid intermediate medium LM stored in the space formed by the bottom portion 44b to the upper end portion 452 of the lower pipe portion 45.

Since the liquid reservoir 44 has a bottom portion 44b and a top portion 44t, the liquid reservoir portion 44 is formed in a shape for accumulating the liquid intermediate medium LM so that the lower end portion 431 of the upper pipe portion 43 is immersed in the liquid intermediate medium LM. ing.

The diameter of the first communication pipe 30 is larger than the diameter of the second communication pipe 40. Further, the length of the first communication pipe 30 is shorter than the length of the second communication pipe 40.

Next, the operation and effect of the operating operation of the intermediate medium type heat exchanger 1 according to the first embodiment will be described.

In the intermediate medium type heat exchanger 1, the liquid intermediate medium LM accumulated in the first chamber 10c is heated and vaporized by the heat source medium in the first chamber 10c via the first heat transfer tube 10d. It becomes a gaseous intermediate medium GM. The gaseous intermediate medium GM once accumulates on the upper side in the first chamber 10c, then rises through the first communication pipe 30 and flows into the second chamber 20c of the liquefied gas vaporizer E2. In the second chamber 20c, the gaseous intermediate medium GM heats the cryogenic liquefied gas via the second heat transfer tube 20d. As a result, the low temperature liquefied gas is vaporized. At this time, the gaseous intermediate medium GM is cooled by the low-temperature liquefied gas and condensed, and becomes the liquid intermediate medium LM again. The liquid intermediate medium LM once accumulated in the second chamber 20c flows into the first chamber 10c through the second communication pipe 40. By repeating this series of operations, in the intermediate medium type heat exchanger 1, heat is transferred from the heat source medium to the low temperature liquefied gas through the circulation of the intermediate medium.

As described above, in the intermediate medium type heat exchanger 1 according to the present embodiment, the intermediate medium evaporator E1 has a first chamber 10c, and the liquefied gas vaporizer E2 has a second chamber 20c. The inside of the first chamber 10c and the inside of the second chamber 20c are communicated with each other by the first communication pipe 30 and the second communication pipe 40. Therefore, the intermediate medium type heat exchanger 1 does not need to be specially designed and can be configured by a general-purpose heat exchanger. Therefore, the cost can be suppressed.

Further, since the intermediate medium type heat exchanger 1 has a liquid reservoir 44 that seals the second communication pipe 40, the gaseous intermediate medium GM vaporized in the first chamber 10c of the intermediate medium evaporator E1. Cannot pass through the liquid reservoir 44. Therefore, since the liquid intermediate medium LM only flows from the second chamber 20c toward the first chamber 10c in the second communication pipe 40, a flooding phenomenon occurs in the second communication pipe 40. Is suppressed.

Specifically, in the intermediate medium type heat exchanger 1, the liquid intermediate medium LM condensed in the second chamber 20c is collected from the lower end portion 431 of the upper pipe portion 43 of the second communication pipe 40 to the liquid reservoir portion 44. It flows out from the liquid reservoir 44 into the upper end portion 452 of the lower pipe portion 45, and flows into the first chamber 10c. At this time, in the liquid reservoir 44, a state in which a certain amount of the liquid intermediate medium LM is accumulated is maintained between the upper end portion 452 of the lower pipe portion 45 and the lower end portion 431 of the upper pipe portion 43. That is, the liquid intermediate medium LM is accumulated in the liquid reservoir 44 so that the lower end portion 431 of the upper pipe portion 43 is immersed in the liquid intermediate medium LM. Since the lower end portion 431 of the upper pipe portion 43 is located below the upper end portion 452 of the lower pipe portion 45, the gaseous intermediate medium GM vaporized in the first chamber 10c is located in the lower pipe portion 45. Even if the amount is increased, the gaseous intermediate medium cannot go toward the lower end portion 431 of the upper pipe portion 43. Therefore, the occurrence of the flooding phenomenon in the second communication pipe 40 is suppressed.

More details are as follows. In the intermediate medium type heat exchanger 1, the liquid intermediate medium LM condensed in the second chamber 20c flows into the upper pipe portion 43 of the second communication pipe 40 and flows out from the lower end portion 431 of the upper pipe portion 43. Then, the bottom surface is located below the lower end portion 431 of the upper pipe portion 43 and accumulates in the space formed by the downwardly convex bottom portion 44b. In this state, when the liquid intermediate medium LM in the second chamber 20c further flows into the upper pipe portion 43 of the second communication pipe 40, the liquid intermediate medium LM already accumulated in the space overflows from the space. .. The overflowing liquid intermediate medium LM is guided to the upper end portion 452 of the lower pipe portion 45 through the space formed by the top portion 44t. In this way, in the liquid reservoir 44, the lower end portion 431 of the upper pipe portion 43 is formed in the space formed by the bottom portion 44b while flowing the liquid intermediate medium LM flowing from the upper pipe portion 43 into the lower pipe portion 45. The state of being immersed in the liquid intermediate medium LM is maintained. Therefore, even if the gaseous intermediate medium GM vaporized in the first chamber 10c rises in the lower pipe portion 45 of the second communication pipe 40, it passes through the liquid intermediate medium LM accumulated in the liquid reservoir 44. Therefore, it cannot go toward the lower end portion 431 of the upper pipe portion 43. Therefore, in the second communication pipe 40, it is possible to suppress that the gaseous intermediate medium GM interferes with the flow of the liquid intermediate medium LM.

Further, in the intermediate medium type heat exchanger 1, a second vaporizer side opening 42 is provided on the bottom surface of the liquefied gas vaporizer E2. Therefore, the liquid intermediate medium LM condensed in the second chamber 20c of the liquefied gas vaporizer E2 and accumulated in the chamber 20c can be efficiently flowed into the second communication pipe 40. Thereby, the performance of the intermediate medium type heat exchanger 1 can be improved.

Further, in the intermediate medium type heat exchanger 1, the diameter of the first communication pipe 30 is larger than the diameter of the second communication pipe 40. Therefore, the pressure loss of the first communication pipe 30 through which the gaseous intermediate medium GM flows is smaller than the pressure loss of the second communication pipe 40 through which the liquid intermediate medium LM flows.

Further, in the intermediate medium type heat exchanger 1, the total length of the first communication pipe 30 is smaller than the total length of the second communication pipe 40. Therefore, the pressure loss of the first communication pipe 30 through which the gaseous intermediate medium GM flows is smaller than the pressure loss of the second communication pipe 40 through which the liquid intermediate medium LM flows.

The liquid reservoir 44 is not limited to the liquid reservoir 44 composed of a bent pipe, and even if a liquid intermediate medium is stored in another form and the second communication pipe 40 is liquid-sealed. good.

For example, as shown in FIG. 3, the liquid reservoir 44 has a hollow member in which the upper pipe portion 43 is inserted from the upper side and the lower pipe portion 45 is inserted from the lower side, and the liquid is inside. It forms a closed space for accommodating the intermediate medium LM and the gaseous intermediate medium GM. The liquid reservoir 44 has a bottom portion 44b that is convex downward and a top portion 44t that is convex upward. The bottom portion 44b has a bottom surface portion 44b1 and a lower side surface portion 44b2 rising from the peripheral edge of the bottom surface portion 44b1. The top portion 44t has a top surface portion 44t1 and an upper side surface portion 44t2 that connects the peripheral edge of the top surface portion 44t1 and the lower side surface portion 44b2 to each other. The upper pipe portion 43 penetrates the top surface portion 44t1 of the top portion 44t and opens into the bottom portion 44b. The lower pipe portion 45 penetrates the bottom surface portion 44b1 of the bottom portion 44b and opens into the top portion 44t. The bottom portion 44b has a portion that is a lower space in the space formed by the liquid reservoir portion 44 and forms a space below the height position of the upper end portion 452 of the lower pipe portion 45. The top portion 44t is an upper space in the space formed by the liquid reservoir portion 44, and is a portion forming an upper space from the height position of the upper end portion 452 of the lower pipe portion 45 (that is, excluding the bottom portion 44b). Part).

The upper end portion 452 of the lower pipe portion 45 is located above the lower end portion 431 of the upper pipe portion 43. Therefore, the liquid intermediate medium LM that has flowed through the upper pipe portion 43 flows out from the lower end portion 431 into the space formed by the bottom portion 44b, and in the space, the upper end portion 452 of the lower pipe portion 45. It can be accumulated up to the height position. That is, the bottom portion 44b has a bottom surface located below the lower end portion 431 of the upper pipe portion 43 and has a downwardly convex shape to form a space for accumulating the liquid intermediate medium LM.

The top portion 44t provides a space for guiding the liquid intermediate medium LM stored up to the height position of the upper end portion 452 of the lower pipe portion 45 into the upper end portion 452 of the lower pipe portion 45 in the space formed by the bottom portion 44b. Form.

When the liquid intermediate medium LM is further discharged from the upper pipe portion 43 in the state where the liquid intermediate medium LM is accumulated in the space formed by the bottom portion 44b, the liquid intermediate medium LM overflows from the space formed by the bottom portion 44b. At this time, in the space formed by the top portion 44t, the overflowing liquid intermediate medium LM is guided to the upper end portion 452 of the lower pipe portion 45 and flows into the lower pipe portion 45. In the space formed by the top portion 44t, the gaseous intermediate medium GM that has risen through the lower pipe portion 45 is accumulated, but the liquid level of the liquid intermediate medium LM is the lower pipe portion 45. Since the lower end portion 431 of the upper pipe portion 43 is located at the height position of the upper end portion 452 and is located below the height position, the gaseous intermediate medium GM accumulated in the top portion 44t passes through the liquid surface. It does not flow into the lower end portion 431 of the upper pipe portion 43.

As shown in FIG. 4, the intermediate medium type heat exchanger 1 may be provided with a heat insulating material 36 and a heat insulating material 46 so as to cover the first communication pipe 30 and the second communication pipe 40, respectively. The heat insulating material 36 is formed so as to cover the outer surface of the first communication pipe 30 from the first evaporator side opening 31 to the first vaporizer side opening 32. The heat insulating material 46 is formed so as to cover the outer peripheral surface of the upper pipe portion 43, the outer peripheral surface of the lower pipe portion 45, the bottom portion 44b of the liquid reservoir portion 44, and the outer surface of the top portion 44. That is, the first communication pipe 30 and the second communication pipe 40 are heat-insulated at the portions that come into contact with the atmosphere, and are not easily affected by external temperature changes.

The heat insulating material 46 provided in the second communication pipe 40 can prevent the liquid intermediate medium LM flowing through the second communication pipe 40 from being heated by the atmosphere and vaporized. As a result, the occurrence of the flooding phenomenon and the increase in the distribution resistance in the second communication pipe 40 are suppressed. Further, the heat insulating material 36 provided in the first communication pipe 30 can prevent the gaseous intermediate medium GM of the first communication pipe 30 from being cooled by the atmosphere. As a result, the decrease in the vaporization efficiency of the gaseous intermediate medium GM in the liquefied gas vaporizer E2 is suppressed. The heat insulating materials 36 and 37 have a thermal conductivity of 1/100 or less of the thermal conductivity of the first communicating tube 30 and the second communicating tube 40, and are, for example, glass wool, rock wool, and polystyrene. Foam, rigid urethane foam, etc. are used. Further, only one of the

heat insulating materials

36 and 46 may be provided.

(Second Embodiment)
In the first embodiment described above, the second communication pipe 40 is liquid-sealed by the liquid reservoir 44. On the other hand, in the second embodiment, the inflow suppressing member 50 (see FIGS. 5 to 7) suppresses the inflow of the gaseous intermediate medium GM into the second communication pipe 40.

The intermediate medium type heat exchanger 1 according to the second embodiment will be described with reference to FIGS. 5 to 7. In the second embodiment, the same components as those in the first embodiment will be omitted by using the same reference numerals, and different components will be mainly described.

The second communication pipe 40 is a pipe that connects the first chamber 10c and the second chamber 20c to each other. Unlike the first embodiment, the second communication pipe 40 according to the second embodiment is not provided with the liquid reservoir 44. The second communication pipe 40 extends in the vertical direction from the bottom surface of the second chamber 20c toward the top surface of the first chamber 10c. The second communication pipe 40 is connected to the bottom surface of the second chamber 20c and the top surface of the first chamber 10c, respectively. Further, the lower portion of the second communication pipe 40 penetrates the top surface of the first chamber 10c and is below the liquid level of the liquid intermediate medium LM accumulated in the first chamber 10c. It extends to a position above the first heat transfer tube 10d in the first chamber 10c. The second communication tube 40 has a second vaporizer side opening 42 that opens at a connection position with the bottom surface of the second chamber 20c, and also has a liquid level in the first chamber 10c and a first heat transfer tube 10d. It has a second evaporator side opening 41 that opens between and. The second evaporator side opening 41 of the second communication pipe 40 is immersed in the liquid intermediate medium LM accumulated in the first chamber 10c, and is in a state of being liquid-sealed in the liquid intermediate medium LM. ..

In the second evaporator side opening 41 of the second communication pipe 40, although the liquid is sealed as described above, the gaseous intermediate medium GM generated in the first heat transfer tube 10d in the first chamber 10c is present. There is a possibility that it will flow into the opening 41 on the second evaporator side. Therefore, the intermediate medium evaporator E1 has an inflow suppressing member 50 that prevents the gaseous intermediate medium GM from flowing into the second communication pipe 40.

The inflow suppression member 50 is a plate-shaped member arranged so as to extend horizontally between the second evaporator side opening 41 of the second communication pipe 40 and the first heat transfer tube 10d. That is, the inflow suppression member 50 is an inflow suppression plate having a portion located below the second evaporator side opening 41 of the second communication pipe 40. The inflow restraining member 50 has an area that covers the second evaporator side opening 41 and makes it invisible when viewed upward from the bottom surface of the first chamber 10c. That is, as shown in FIG. 7, the inflow suppressing member 50 has a shape in which the peripheral edge 50r is located radially outside the peripheral edge portion 41r of the second evaporator side opening 41. As a result, in the inflow suppressing member 50, the gaseous intermediate medium GM generated in the first heat transfer tube 10d in the first chamber 10c flows into the second communication pipe 40 through the second evaporator side opening 41. Suppress doing.

As described above, the intermediate medium type heat exchanger 1 according to the second embodiment does not need to be specially designed and manufactured like the intermediate medium type heat exchanger 1 according to the first embodiment. Since it can be configured by a general-purpose heat exchanger, the cost can be suppressed.

Further, in the intermediate medium type heat exchanger 1, since the intermediate medium evaporator E1 has the inflow suppression member 50, the gaseous intermediate medium GM vaporized in the first chamber 10c of the intermediate medium evaporator E1 is the second. The inflow from the second evaporator side opening 41 of the communication pipe 40 into the second communication pipe 40 is suppressed. Therefore, in the intermediate medium type heat exchanger 1, the occurrence of the flooding phenomenon in the second communication pipe 40 is suppressed.

Specifically, it is as follows. As shown in FIG. 7, in the intermediate medium type heat exchanger 1, a gaseous intermediate medium heated and vaporized by the first heat transfer tube 10d in the first chamber 10c below the second communication tube 40. GM may rise. In this case, the gaseous intermediate medium GM reaches the lower surface of the portion of the inflow suppression member (inflow suppression plate) 50 located below the second evaporator side opening 41. The gaseous intermediate medium GM moves horizontally along the lower surface of the inflow suppressing member 50 and rises again from the peripheral edge 50r of the inflow suppressing member 50. That is, in the first chamber 10c, the gaseous intermediate medium GM is evaded by the inflow suppressing member 50 and rises. At this time, since the peripheral edge 50r of the inflow suppressing member 50 is located radially outside the peripheral edge portion 41r of the second evaporator side opening 41, it is in the form of a gas rising from the peripheral edge 50r of the inflow suppressing member 50. The intermediate medium GM cannot flow into the second communication pipe 40 through the second evaporator side opening 41. Therefore, the inflow suppressing member 50 suppresses the occurrence of the flooding phenomenon in the second communication pipe 40.

Further, also in the intermediate medium type heat exchanger 1, since the second vaporizer side opening 42 is provided on the bottom surface of the liquefied gas vaporizer E2, the liquid condensed in the second chamber 20c of the liquefied gas vaporizer E2. The intermediate medium LM can be efficiently flowed into the second communication pipe 40. Thereby, the performance of the intermediate medium type heat exchanger 1 can be improved.

Further, even in the intermediate medium type heat exchanger 1, the diameter of the first communication pipe 30 is larger than the diameter of the second communication pipe 40. Therefore, the pressure loss of the first communication pipe 30 through which the gaseous intermediate medium GM flows is smaller than the pressure loss of the second communication pipe 40 through which the liquid intermediate medium LM flows.

Further, even in the intermediate medium type heat exchanger 1, the total length of the first communication pipe 30 is smaller than the total length of the second communication pipe 40. Therefore, the pressure loss of the first communication pipe 30 through which the gaseous intermediate medium GM flows is smaller than the pressure loss of the second communication pipe 40 through which the liquid intermediate medium LM flows.

The inflow suppressing member 50 is not limited to the form shown in FIG. 7, and may be another form. For example, as shown in FIG. 8A, the inflow suppression member 50 is inclined from the horizontal direction between the second evaporator side opening 41 of the second communication pipe 40 and the first heat transfer pipe 10d. It may be arranged so as to extend to. The inflow suppressing member 50 is arranged below the second evaporator side opening 41 as a whole.

Since the inflow suppressing member 50 in FIG. 8A is a plate-shaped member extending in a direction inclined from the horizontal direction, the position where the gaseous intermediate medium GM is efficiently separated from the second evaporator side opening 41. Can be guided to.

As shown in FIG. 8B, the inflow suppression member 50 has a conical shape having a lowest point below the second evaporator side opening 41 of the second communication pipe 40, and is inclined from the horizontal direction. It may be a member having a shape extending in the horizontal direction. The peripheral edge 50r of the inflow suppression member 50 may be located above the peripheral edge portion 41r of the second evaporator side opening 41, and may be radially outside the peripheral edge portion 41r of the second evaporator side opening 41. If it is located at, it may be located below the peripheral edge portion 41r.

The inflow suppression member 50 of FIG. 8B has a portion extending in a direction inclined from the horizontal direction, and the peripheral edge 50r is located above the peripheral edge portion 41r of the second evaporator side opening 41. The gaseous intermediate medium GM can be efficiently guided to a position away from the second evaporator side opening 41.

As shown in FIG. 8 (c), the inflow suppression member 50 has a bottom extending horizontally between the second evaporator side opening 41 of the second communication pipe 40 and the first heat transfer tube 10d, and a bottom portion. It may be a member having a vertical wall portion that bends and extends upward from the peripheral edge of the surface. The peripheral edge 50r of the vertical wall portion may be located above the peripheral edge portion 41r of the second evaporator side opening 41, and may be radially outward from the peripheral edge portion 41r of the second evaporator side opening 41. If it is located, it may be located below the peripheral edge portion 41r.

In the inflow suppression member 50 of FIG. 8C, since the peripheral edge 50r is located above the peripheral edge 41r of the second evaporator side opening 41, the gaseous intermediate medium GM is efficiently second-evaporated. It can be guided to a position away from the vessel side opening 41.

Each of the inflow suppressing members 50 of FIGS. 8A, 8B, and 5C has a portion located below the second evaporator side opening 41, and the peripheral edge 50r is the second evaporator. It has a shape located radially outside the peripheral edge portion 41r of the side opening portion 41. As a result, in the inflow suppression member 50 of FIGS. 8A, 8B and 8C, the gaseous intermediate medium GM in the first chamber 10c is secondly communicated through the second evaporator side opening 41. It suppresses the inflow into the pipe 40.

In the first and second embodiments, the position where the first communication pipe 30 connects to the first chamber 10c and the second chamber 20c is not limited to the position shown in the above embodiment. That is, in the first embodiment and the second embodiment, the first communication pipe 30 is connected to the other side in the longitudinal direction of the first chamber 10c and the second chamber 20c. The connection position of the communication pipe 30 may be one side wall portion in the longitudinal direction (left side in FIG. 1) of the first chamber 10c and the second chamber 20c, and each front side wall portion or rear side wall portion (FIG. 2). On the left and right sides of). Also in this case, the opening 31 on the first evaporator side of the first communication pipe 30 is located at a position above the liquid level of the liquid intermediate medium LM in the first chamber 10c. The first communication pipe 30 may be connected to the first chamber 10c. Similarly, the first so that the opening 32 on the first vaporizer side of the first communication pipe 30 opens at a position above the liquid level of the liquid intermediate medium LM in the second chamber 20c. It suffices if the communication pipe 30 is connected to the second chamber 20c.

If the first evaporator side opening 31 of the first communication pipe 30 is located above the liquid level of the intermediate medium LM in the first chamber 10c, the first communication pipe 30 is the first communication pipe 30. It may extend into the chamber 10c. Similarly, if the first vaporizer-side opening 32 of the first communication pipe 30 is located above the liquid level of the intermediate medium LM in the second chamber 20c, the first communication pipe 30 will be. It may extend into the second chamber 20c.

In the first and second embodiments, the position where the second communication pipe 40 connects to the first chamber 10c and the second chamber 20c is not limited to the position shown in the above embodiment. Even if the connection position of the second communication pipe 40 is the one side wall portion in the longitudinal direction or the other side wall portion in the longitudinal direction (the wall portion of the left and right side ends in FIG. 1) of the first chamber 10c and the second chamber 20c. It may be the front side wall portion or the rear side wall portion (the left and right wall portions in FIG. 2). Also in this case, the second vaporizer side opening 42 of the second communication pipe 40 opens at a position below the liquid level of the liquid intermediate medium LM in the second chamber 20c. Communication pipe 40 may be connected to the second chamber 20c.

Further, in the first embodiment in which the second communication pipe 40 has the liquid reservoir 44, the second evaporator side opening 41 of the second communication pipe 40 is at an arbitrary position in the first chamber 10c. The second communication pipe 40 may be connected to the first chamber 10c so as to open. Further, in the second embodiment in which the intermediate medium evaporator E1 has an inflow suppression member 50, the second evaporator side opening 41 of the second communication pipe 40 is a liquid intermediate medium LM in the first chamber 10c. The second communication pipe 40 may be connected to the first chamber 10c so as to open at a position below the liquid level.

If the second vaporizer side opening 42 of the second communication pipe 40 is located below the liquid level of the intermediate medium LM in the second chamber 20c, the second communication pipe 40 is the second communication pipe 40. It may extend into the chamber 20c of.

The diameter of the first communication pipe 30 may be equal to or smaller than the diameter of the second communication pipe 40.

The total length of the first communication pipe 30 may be equal to or larger than the total length of the second communication pipe 40.

As shown in FIG. 9, the intermediate medium type heat exchanger 1 may be provided with a heat insulating material 36 and a heat insulating material 46 so as to cover the first communication pipe 30 and the second communication pipe 40, respectively. The heat insulating material 36 is formed so as to cover the outer surface of the first communication pipe 30 from the first evaporator side opening 31 to the first vaporizer side opening 32. The heat insulating material 46 is formed so as to cover the outer surface of the second communication pipe 40 from the connection portion in the first chamber 10c of the second communication pipe 40 to the second vaporizer side opening 42. .. That is, the first communication pipe 30 and the second communication pipe 40 are heat-insulated at the portions that come into contact with the atmosphere, and are not easily affected by external temperature changes.

The heat insulating material 46 provided in the second communication pipe 40 can prevent the liquid intermediate medium LM flowing through the second communication pipe 40 from being heated by the atmosphere and vaporized. As a result, the occurrence of the flooding phenomenon and the increase in the distribution resistance in the second communication pipe 40 are suppressed. Further, the heat insulating material 36 provided in the first communication pipe 30 can prevent the gaseous intermediate medium GM of the first communication pipe 30 from being cooled by the atmosphere. As a result, the decrease in the vaporization efficiency of the gaseous intermediate medium GM in the liquefied gas vaporizer E2 is suppressed. In addition, only one of the heat insulating materials 36 and 37 may be provided.

Here, the embodiment will be outlined.

(1) The intermediate medium type heat exchanger according to the first embodiment has a hollow first chamber and a first heat transfer tube arranged so as to pass through the first chamber and into which a heat source medium flows. An intermediate medium evaporator having a A liquefied gas vaporizer having 2 heat transfer tubes, a first communication tube that communicates with each other in the first chamber and the second chamber, and in the first chamber and the second chamber. A second communication pipe, which communicates with each other in the chamber of the above, is provided. An intermediate medium is enclosed in the space provided by the first chamber, the second chamber, the first communication pipe, and the second communication pipe. The liquid intermediate medium in the first chamber is heated by the heat source medium via the first heat transfer tube and vaporized to become a gaseous intermediate medium. The gaseous intermediate medium in the second chamber is cooled and condensed by the cryogenic liquefied gas via the second heat transfer tube to become a liquid intermediate medium. The first communication pipe has a first vaporizer-side opening that opens at a position above the liquid level of the liquid intermediate medium in the second chamber, and the liquid in the first chamber. It has a first evaporator-side opening that opens at a position above the liquid level of the intermediate medium. The second communication pipe opens in the first chamber with a second vaporizer-side opening that opens at a position below the liquid level of the liquid intermediate medium in the second chamber. It has a second evaporator side opening and a liquid reservoir for storing the liquid intermediate medium and sealing the second communication pipe.

In the intermediate medium type heat exchanger, the liquid intermediate medium accumulated in the first chamber is heated and vaporized by the heat source medium in the first chamber via the first heat transfer tube, and is a gaseous intermediate medium. become. The gaseous intermediate medium rises through the first communication pipe and flows into the second chamber of the liquefied gas vaporizer. In the second chamber, the gaseous intermediate medium vaporizes the low temperature liquefied gas by heating the low temperature liquefied gas via the second heat transfer tube. At this time, the gaseous intermediate medium is cooled by the cryogenic liquefied gas and condensed, and becomes a liquid intermediate medium again. The liquid intermediate medium accumulated in the second chamber flows into the first chamber through the second communication pipe. By repeating this series of operations, heat is transferred from the heat source medium to the cryogenic liquefied gas in the intermediate medium type heat exchanger through the circulation of the intermediate medium.

Further, in the intermediate medium heat exchanger, the intermediate medium evaporator has a first chamber and the liquefied gas vaporizer has a second chamber, and the inside of the first chamber and the inside of the second chamber are separated. It communicates with each other through the first communication pipe and the second communication pipe. Therefore, the intermediate medium heat exchanger does not need to be specially designed and can be configured by a general-purpose heat exchanger. Therefore, the cost can be suppressed.

Further, since the intermediate medium type heat exchanger has a liquid reservoir for sealing the second communication pipe, the gaseous intermediate medium vaporized in the first chamber of the intermediate medium evaporator has a liquid reservoir. I can't pass. Therefore, since the liquid intermediate medium only flows from the second chamber to the first chamber in the second communication pipe, the flooding phenomenon is suppressed in the second communication pipe.

(2) As a preferred embodiment of the intermediate medium type heat exchanger, the second communication pipe has an upper pipe portion extending downward from the second vaporizer side opening and an upper pipe portion extending upward from the second evaporator side opening. It may further have a lower pipe portion that extends and has an upper end portion located above the lower end portion of the upper pipe portion. In this case, the liquid reservoir portion may be formed in a shape for accumulating the liquid intermediate medium so that the lower end portion of the upper pipe portion is immersed in the liquid intermediate medium.

In the intermediate medium type heat exchanger according to this embodiment, the liquid intermediate medium condensed in the second chamber flows into the liquid reservoir from the lower end of the upper pipe portion of the second communication pipe, and flows from the liquid reservoir. It flows into the upper end of the lower pipe and flows into the first chamber. At this time, in the liquid reservoir portion, a state in which a certain amount of liquid intermediate medium is accumulated is maintained between the upper end portion of the lower pipe portion and the lower end portion of the upper pipe portion. Further, the lower end portion of the upper pipe portion is located below the upper end portion of the lower pipe portion. Therefore, even if the gaseous intermediate medium vaporized in the first chamber rises in the lower pipe portion, the gaseous intermediate medium cannot go toward the lower end portion of the upper pipe portion. Therefore, the occurrence of the flooding phenomenon in the second communication pipe is suppressed.

(3) As a preferred embodiment of the intermediate medium type heat exchanger, the bottom surface of the liquid reservoir is located below the lower end of the upper pipe portion, and the liquid reservoir portion is downward to form a space for accumulating the liquid intermediate medium. It may have a convex bottom and a top that forms a space that guides the liquid intermediate medium stored in the space into the upper end of the lower tube.

In the intermediate medium type heat exchanger according to this aspect, the liquid intermediate medium condensed in the second chamber flows into the upper pipe portion of the second communication pipe. This liquid intermediate medium flows out from the lower end of the upper pipe portion, and the bottom surface is located below the lower end portion of the upper pipe portion and accumulates in the space formed by the downwardly convex bottom portion. In this state, when the liquid intermediate medium in the second chamber further flows into the upper pipe portion of the second communication pipe, the liquid intermediate medium already accumulated in the space overflows from the space. The overflowing liquid intermediate medium is guided into the upper end of the lower tube by the space formed by the top. In this way, in the liquid reservoir portion, the lower end portion of the upper pipe portion is immersed in the liquid intermediate medium in the space formed by the bottom portion while the liquid intermediate medium flowing from the upper pipe portion is allowed to flow to the lower pipe portion. The state of being is maintained. Therefore, even if the gaseous intermediate medium vaporized in the first chamber rises in the lower pipe portion of the second communication pipe, it passes through the liquid intermediate medium accumulated in the liquid reservoir portion and of the upper pipe portion. I can't go to the bottom. Therefore, in the second communication pipe, it is possible to prevent the gaseous intermediate medium from obstructing the flow of the liquid intermediate medium.

(4) The intermediate medium type heat exchanger according to the second embodiment has a hollow first chamber and a first heat transfer tube arranged so as to pass through the first chamber and into which a heat source medium flows. An intermediate medium evaporator having a A liquefied gas vaporizer having 2 heat transfer tubes, a first communication tube that communicates with each other in the first chamber and the second chamber, and in the first chamber and the second chamber. A second communication pipe, which communicates with each other in the chamber of the above, is provided. An intermediate medium is enclosed in the space provided by the first chamber, the second chamber, the first communication pipe, and the second communication pipe. The liquid intermediate medium in the first chamber is heated by the heat source medium via the first heat transfer tube and vaporized to become a gaseous intermediate medium. The gaseous intermediate medium in the second chamber is cooled and condensed by the cryogenic liquefied gas via the second heat transfer tube to become a liquid intermediate medium. The first communication pipe has a first vaporizer-side opening that opens at a position above the liquid level of the liquid intermediate medium in the second chamber, and the liquid in the first chamber. It has a first evaporator-side opening that opens at a position above the liquid level of the intermediate medium. The second communication pipe has a second vaporizer-side opening that opens at a position below the liquid level of the liquid intermediate medium in the second chamber, and the liquid in the first chamber. It has a second evaporator side opening that opens at a position below the liquid level of the intermediate medium and at a position above the first heat transfer tube. The intermediate medium evaporator further includes an inflow suppressing member that prevents the gaseous intermediate medium in the first chamber from flowing into the second communication pipe through the second evaporator side opening.

Similar to the above, this intermediate medium type heat exchanger does not need to be specially designed and manufactured, and can be configured by a general-purpose heat exchanger, so that the cost can be suppressed.

Further, in this intermediate medium type heat exchanger, since the intermediate medium evaporator has an inflow suppression member, the gaseous intermediate medium vaporized in the first chamber of the intermediate medium evaporator is the second communication pipe. 2 The inflow from the evaporator side opening into the second communication pipe is suppressed. Therefore, in this intermediate medium type heat exchanger, the occurrence of the flooding phenomenon in the second communication pipe is suppressed.

(5) As a preferred embodiment of the intermediate medium type heat exchanger, the inflow suppressing member has a portion located below the opening on the second evaporator side, and the peripheral edge is on the second evaporator side. It may have a shape located radially outside the peripheral edge of the opening.

In this intermediate medium type heat exchanger, when the gaseous intermediate medium vaporized under the second communication pipe rises in the first chamber, the gaseous intermediate medium is second evaporated in the inflow suppression member. It reaches the lower surface of the portion located below the opening on the vessel side. This gaseous intermediate medium moves along the inflow restraining member and rises again from the peripheral edge of the inflow restraining member. That is, in the first chamber, the gaseous intermediate medium rises while dodging the inflow restraining member. At this time, since the peripheral edge of the inflow suppressing member is located radially outside the peripheral edge of the opening on the second evaporator side, the gaseous intermediate medium rising again from the peripheral edge of the inflow suppressing member is the first. 2 It cannot flow into the second communication pipe through the evaporator side opening. Therefore, the inflow suppressing member suppresses the occurrence of the flooding phenomenon in the second communication pipe.

(6) As a preferred embodiment of the intermediate medium type heat exchanger, the second communication pipe is connected to the bottom surface of the liquefied gas vaporizer, and the opening on the second vaporizer side is the liquefied gas vaporization. It may be provided on the bottom surface of the vessel.

In the intermediate medium type heat exchanger according to this aspect, the second vaporizer side opening is provided on the bottom surface of the liquefied gas vaporizer. As a result, the liquid intermediate medium condensed in the second chamber of the liquefied gas vaporizer can be efficiently flowed into the second communication pipe. Thereby, the performance of the intermediate medium type heat exchanger can be improved.

(7) As a preferred embodiment of the intermediate medium type heat exchanger, the diameter of the first communication pipe may be larger than the diameter of the second communication pipe.

In the intermediate medium type heat exchanger according to this aspect, the pressure loss of the gaseous intermediate medium in the first communication pipe is suppressed.

(8) As a preferred embodiment of the intermediate medium type heat exchanger, the total length of the first communication pipe may be shorter than the total length of the second communication pipe.

(9) As a preferred embodiment of the intermediate medium type heat exchanger, at least one of the first communication pipe and the second communication pipe may be provided with a heat insulating material at a portion in contact with the atmosphere.

In the intermediate medium type heat exchanger according to this embodiment, the heat insulating material allows heat dissipation to the atmosphere and heat input from the atmosphere of the intermediate medium flowing through at least one of the first communication pipe and the second communication pipe. It can be suppressed.

Therefore, the cost of the intermediate medium type heat exchanger can be suppressed.

Claims

An intermediate medium evaporator having a hollow first chamber and a first heat transfer tube arranged to pass through the first chamber and into which a heat source medium flows.
A liquefaction having a hollow second chamber arranged above the first chamber and a second heat transfer tube arranged so as to pass through the second chamber and into which the low temperature liquefied gas flows. With a gas vaporizer,
A first communication pipe that communicates the inside of the first chamber and the inside of the second chamber with each other,
A second communication pipe that communicates the inside of the first chamber and the inside of the second chamber with each other,
Equipped with
An intermediate medium is enclosed in the space provided by the first chamber, the second chamber, the first communication pipe, and the second communication pipe.
The liquid intermediate medium in the first chamber is heated by the heat source medium via the first heat transfer tube and vaporized to become a gaseous intermediate medium.
The gaseous intermediate medium in the second chamber is cooled and condensed by the cryogenic liquefied gas via the second heat transfer tube to become a liquid intermediate medium.
The first communication pipe is
A first vaporizer-side opening that opens at a position above the liquid level of the liquid intermediate medium in the second chamber,
A first evaporator side opening that opens at a position above the liquid level of the liquid intermediate medium in the first chamber,
Have,
The second communication pipe is
A second vaporizer-side opening that opens at a position below the liquid level of the liquid intermediate medium in the second chamber.
A second evaporator-side opening that opens in the first chamber,
A liquid reservoir for storing the liquid intermediate medium and sealing the second communication pipe, and a liquid reservoir.
Have,
Intermediate medium heat exchanger.
The second communication pipe is
An upper pipe portion extending downward from the second vaporizer side opening and a lower pipe portion extending upward from the second evaporator side opening and having an upper end portion located above the lower end portion of the upper pipe portion. When,
Further have
The liquid reservoir portion is formed in a shape for accumulating the liquid intermediate medium so that the lower end portion of the upper pipe portion is immersed in the liquid intermediate medium.
The intermediate medium type heat exchanger according to claim 1.
The liquid reservoir is
A downwardly convex bottom portion having a bottom surface located below the lower end portion of the upper pipe portion and forming a space for storing the liquid intermediate medium.
A top portion forming a space for guiding the liquid intermediate medium stored in the space into the upper end portion of the lower pipe portion, and a top portion.
Have,
The intermediate medium type heat exchanger according to claim 2.
An intermediate medium evaporator having a hollow first chamber and a first heat transfer tube arranged to pass through the first chamber and into which a heat source medium flows.
A liquefaction having a hollow second chamber arranged above the first chamber and a second heat transfer tube arranged so as to pass through the second chamber and into which the low temperature liquefied gas flows. With a gas vaporizer,
A first communication pipe that communicates the inside of the first chamber and the inside of the second chamber with each other,
A second communication pipe that communicates the inside of the first chamber and the inside of the second chamber with each other,
Equipped with
An intermediate medium is enclosed in the space provided by the first chamber, the second chamber, the first communication pipe, and the second communication pipe.
The liquid intermediate medium in the first chamber is heated by the heat source medium via the first heat transfer tube and vaporized to become a gaseous intermediate medium.
The gaseous intermediate medium in the second chamber is cooled and condensed by the cryogenic liquefied gas via the second heat transfer tube to become a liquid intermediate medium.
The first communication pipe is
A first vaporizer-side opening that opens at a position above the liquid level of the liquid intermediate medium in the second chamber,
A first evaporator-side opening that opens at a position above the liquid level of the liquid intermediate medium in the first chamber,
Have,
The second communication pipe is
A second vaporizer-side opening that opens at a position below the liquid level of the liquid intermediate medium in the second chamber.
A second evaporator-side opening that opens in the first chamber at a position below the liquid level of the liquid intermediate medium and at a position above the first heat transfer tube.
Have,
The intermediate medium evaporator further includes an inflow suppressing member that prevents the gaseous intermediate medium in the first chamber from flowing into the second communication pipe through the second evaporator side opening.
Intermediate medium heat exchanger.
The inflow suppressing member has a portion located below the opening on the second evaporator side, and has a shape in which the peripheral edge is located radially outside the peripheral edge of the opening on the second evaporator side. Have,
The intermediate medium type heat exchanger according to claim 4.
The second communication pipe is connected to the bottom surface of the liquefied gas vaporizer.
The second vaporizer side opening is provided on the bottom surface of the liquefied gas vaporizer.
The intermediate medium type heat exchanger according to claim 1 or 4.
The diameter of the first communication pipe is larger than the diameter of the second communication pipe.
The intermediate medium type heat exchanger according to claim 1 or 4.
The total length of the first communication pipe is smaller than the total length of the second communication pipe.
The intermediate medium type heat exchanger according to claim 1 or 4.
At least one of the first communication pipe and the second communication pipe is provided with a heat insulating material at a portion in contact with the atmosphere.
The intermediate medium type heat exchanger according to claim 1 or 4.