JP2011127754A - Hydrogen gas cooling device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hydrogen gas cooling device which attains a further reduction of the entire device in size, or improves the cooling performance without changing the size of the device. <P>SOLUTION: The hydrogen gas cooling device 1 includes a main heat exchanger 2, a head tank 3, and an auxiliary heat exchanger 4 which heat exchanges between exhaust gas exhausted from the head tank 3 when liquefied gas is vaporized and generated and un-cooled hydrogen gas to preliminarily cool the hydrogen gas. The main heat exchanger 2 has a double-tube structure composed of an inner tube 5 and an outer tube 6. Hydrogen flows in the inner tube 5, and the outer tube 6 is filled with the liquefied gas. A liquefied gas supply pipe 8 for supplying the liquefied gas from the head tank 3 is connected to the bottom of the outer tube 6. A return pipe 15 for returning the liquefied gas to the head tank 3 is provided at a position above the bottom of the outer tube 6. The head tank 3 is arranged at an upper part where the bottom of the head tank 3 is located beyond the top of the main heat exchanger 2. The auxiliary heat exchanger 4 is provided to precede the main heat exchanger 2. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an improvement of a hydrogen gas cooling device.

In a hydrogen vehicle, it is required to fill the fuel tank with hydrogen gas at a high pressure. Therefore, when the hydrogen gas is filled into the fuel tank, the temperature rises due to adiabatic compression. Also, unlike general gases, hydrogen gas has the property that the temperature rises due to the Joule-Thompson effect when it is adiabatically expanded.
In order to increase the efficiency of the filling operation, when the supply flow rate of hydrogen gas is set high, the hydrogen gas tends to become high temperature. Therefore, when filling the fuel tank, the hydrogen gas is set to about −30 ° C. to −40 ° C. in advance. It needs to be cooled.

As an apparatus for cooling hydrogen gas in such an application, there is one proposed in Patent Document 1. Specifically, the cooling device described in Patent Document 1 includes a heat exchanger having a structure in which a coiled cooling pipe is immersed in a refrigerant storage tank that stores and circulates a cooling medium such as brine. The pipe is cooled by flowing hydrogen to be cooled.
Also known is a type of cooling device that supplies and stores a liquefied gas such as liquid nitrogen to a refrigerant storage tank as a cooling medium.

  However, in the hydrogen gas cooling device described in Patent Document 1, the entire facility is increased in size, the consumption of liquid nitrogen as a cooling medium is increased, and the startup time and end time of the device are increased. There were problems such as.

  Then, as a hydrogen gas cooling device which solves the above-mentioned trouble, there is a thing proposed in patent documents 2. Specifically, as shown in FIG. 6, the hydrogen gas cooling device 101 includes a heat exchanger 102 that cools the hydrogen gas by performing heat exchange between the hydrogen gas and the liquefied gas, and the heat exchanger 102. A head tank 103 for storing the supplied liquefied gas is provided, and the heat exchanger 102 has a double pipe structure, hydrogen flows to the inner pipe 105 side, and the liquefied gas is filled to the outer pipe 106 side, The pipe axis of the double pipe is arranged so as to be vertical or oblique. A liquefied gas supply pipe 108 for supplying liquefied gas from the head tank 103 is connected to the bottom of the outer pipe 106, and a return pipe 115 for returning the liquefied gas to the head tank 103 at a position above the bottom of the outer pipe 106 is provided. The head tank 103 is located above the bottom of the head tank 103 beyond the top of the heat exchanger 102.

  The hydrogen gas cooling device described in Patent Document 2 solves the above problems, but there has been a demand for further downsizing the entire facility and improving the cooling capacity without changing the size of the facility.

  Further, in the hydrogen gas cooling device described in Patent Document 2, the hydrogen gas close to the outlet side of the heat exchanger is sufficiently cooled, but is heated while flowing in the pipe, so that the fuel tank of the hydrogen automobile In some cases, the inlet of the supply destination container becomes higher than the desired temperature range. Therefore, in the heat exchanger, the hydrogen gas must be cooled excessively (that is, cooled to a lower temperature) than required in the supply destination container, resulting in a problem that the heat exchanger becomes large. It was.

Japanese Patent Laying-Open No. 2005-083567 JP 2008-267596 A

  The present invention has been made in view of the above circumstances, and provides a hydrogen gas cooling device capable of further reducing the size of the entire device or improving the cooling capacity without changing the device size. With the goal.

To solve this problem,
The invention according to claim 1 is a main heat exchanger that cools hydrogen gas by exchanging heat between hydrogen gas and liquefied gas, a head tank that stores liquefied gas supplied to the main heat exchanger, The main heat exchanger has a double tube structure comprising an inner tube and an outer tube, hydrogen flows into the inner tube, and the outer tube is filled with liquefied gas, and the tube axis of the double tube Is arranged in a vertical direction or an oblique direction, and a liquefied gas supply pipe for supplying a liquefied gas from the head tank is connected to the bottom of the outer pipe, and the liquefied gas is positioned above the bottom of the outer pipe. A return pipe is provided to return the head tank to the head tank, and the head tank is a hydrogen gas cooling device disposed at the bottom of the head tank above the top of the main heat exchanger,
An auxiliary heat exchanger that preliminarily cools the hydrogen gas by exchanging heat between the exhaust gas generated by the vaporization of the liquefied gas and the exhaust gas discharged from the head tank and the uncooled hydrogen gas; ,
In the hydrogen gas cooling device, the auxiliary heat exchanger is provided in a stage preceding the main heat exchanger.

The invention according to claim 2 is a main heat exchanger that cools the hydrogen gas by performing heat exchange between the hydrogen gas and the liquefied gas;
A head tank for storing liquefied gas supplied to the main heat exchanger,
The main heat exchanger has a double tube structure including an inner tube and an outer tube, hydrogen flows into the inner tube, liquefied gas is filled in the outer tube, and the tube axis of the double tube is in the vertical direction. Alternatively, a liquefied gas supply pipe that is arranged in an oblique direction and supplies a liquefied gas from the head tank is connected to the bottom of the outer pipe, and the liquefied gas is supplied to the head at a position above the bottom of the outer pipe. A return pipe is provided to return to the tank,
The head tank is a hydrogen gas cooling device that is disposed above the bottom of the head tank beyond the top of the main heat exchanger,
The liquefied gas is vaporized and generated, and heat is exchanged between the exhaust gas exhausted from the head tank and the cooled hydrogen gas to further cool the hydrogen gas and keep it at a low temperature. With a heat exchanger,
2. The hydrogen gas cooling device according to claim 1, wherein the auxiliary heat exchanger is provided at a subsequent stage of the main heat exchanger.

The invention according to claim 3 is a main heat exchanger that performs heat exchange between hydrogen gas and liquefied gas to cool the hydrogen gas;
A head tank for storing liquefied gas supplied to the main heat exchanger,
The main heat exchanger has a double tube structure including an inner tube and an outer tube, hydrogen flows into the inner tube, liquefied gas is filled in the outer tube, and the tube axis of the double tube is in the vertical direction. Alternatively, a liquefied gas supply pipe that is arranged in an oblique direction and supplies a liquefied gas from the head tank is connected to the bottom of the outer pipe, and the liquefied gas is supplied to the head at a position above the bottom of the outer pipe. A return pipe is provided to return to the tank,
The head tank is a hydrogen gas cooling device that is disposed above the bottom of the head tank beyond the top of the main heat exchanger,
A first auxiliary heat exchange is performed in which the liquefied gas is vaporized and heat exchange is performed between the exhaust gas discharged from the head tank and the uncooled hydrogen gas to precool the hydrogen gas. And
A second auxiliary heat exchanger that performs heat exchange between the exhaust gas and the hydrogen gas after cooling, and additionally cools the hydrogen gas to maintain a low temperature;
In the hydrogen gas cooling device, the first auxiliary heat exchanger is provided in the front stage of the main heat exchanger, and the second auxiliary heat exchanger is provided in the rear stage of the main heat exchanger. is there.

The invention according to claim 4 is characterized in that the heat exchange promoting means is provided on the outer peripheral portion of the inner pipe of the main heat exchanger. It is a gas cooling device.
The invention according to claim 5 is the hydrogen gas cooling device according to claim 4, wherein the heat exchange promoting means is a metal wire or a fin wound so as to be in close contact with the inner tube. .
The invention according to claim 6 is the hydrogen gas cooling device according to any one of claims 1 to 5, wherein a heat exchange promoting member is filled in the outer tube of the main heat exchanger. It is.
According to a seventh aspect of the present invention, in the hydrogen gas cooling according to the sixth aspect, the heat exchange promoting member is any one of a lessing ring, a Raschig ring, a pole ring, and a saddle, or a mixture of two or more. Device.

According to an eighth aspect of the present invention, there is provided a main heat exchanger that cools the hydrogen gas by exchanging heat between the hydrogen gas and the liquefied gas, and a head tank that stores the liquefied gas supplied to the main heat exchanger. And the main heat exchanger has a double tube structure including an inner tube and an outer tube, hydrogen flows into the inner tube, and the outer tube is filled with a liquefied gas. A pipe axis is arranged so as to be in a vertical direction or an oblique direction, and a liquefied gas supply pipe for supplying a liquefied gas from the head tank is connected to a bottom portion of the outer pipe, and is positioned above the bottom of the outer pipe. A return pipe for returning liquefied gas to the head tank is provided, and the head tank is a hydrogen gas cooling device arranged at the bottom of the head tank above the top of the main heat exchanger,
The hydrogen gas cooling device is characterized in that heat exchange promoting means is provided on an outer peripheral portion of the inner pipe of the main heat exchanger.

  The invention according to claim 9 is the hydrogen gas cooling device according to claim 8, wherein the heat exchange promoting means is a metal wire or a fin wound so as to be in close contact with the inner tube. .

Further, the invention according to claim 10 is a main heat exchanger that cools hydrogen gas by exchanging heat between hydrogen gas and liquefied gas, and a head tank that stores liquefied gas supplied to the main heat exchanger. And the main heat exchanger has a double tube structure including an inner tube and an outer tube, hydrogen flows into the inner tube, and the outer tube is filled with a liquefied gas. A pipe axis is arranged so as to be in a vertical direction or an oblique direction, and a liquefied gas supply pipe for supplying a liquefied gas from the head tank is connected to a bottom portion of the outer pipe, and is positioned above the bottom of the outer pipe. A return pipe for returning liquefied gas to the head tank is provided, and the head tank is a hydrogen gas cooling device arranged at the bottom of the head tank above the top of the main heat exchanger,
The hydrogen gas cooling device is characterized in that a heat exchange promoting member is filled in the outer tube of the main heat exchanger.

  The invention according to claim 11 is the hydrogen gas cooling according to claim 10, wherein the heat exchange promoting member is any one or a mixture of a lessing ring, a Raschig ring, a pole ring, and a saddle. Device.

  According to the hydrogen gas cooling device of the present invention, the liquefied gas is vaporized and generated, and heat exchange is performed between the exhaust gas discharged from the head tank and the uncooled hydrogen gas to precool the hydrogen gas. An auxiliary heat exchanger is provided, and this auxiliary heat exchanger is provided in the front stage of the main heat exchanger, so that uncooled hydrogen gas before being introduced into the main heat exchanger can be precooled. . That is, since the exhaust gas of the head tank that has been exhausted outside the system is used for preliminary cooling, the consumption of the liquefied gas as the refrigerant can be reduced. Thereby, even if it is a case where the size of a main heat exchanger is reduced, the cooling capability equivalent to the case where the main heat exchanger of the conventional size is used is obtained. In addition, since the auxiliary heat exchanger uses gas on both the cooling side and the cooled side, a space-saving heat exchanger can be used. As a result, installation in a dead space in the apparatus is also possible, and there is no possibility of causing an increase in the size of the apparatus. Therefore, it is possible to provide a hydrogen gas cooling device that can further reduce the size of the entire device or that can improve the cooling capacity without changing the device size.

  According to the second aspect of the hydrogen gas cooling device of the present invention, the liquefied gas is vaporized and generated, and heat is exchanged between the exhaust gas discharged from the head tank and the cooled hydrogen gas. The auxiliary heat exchanger to be performed is configured to be provided after the main heat exchanger. As a result, the cooled hydrogen gas can be additionally cooled and kept at a low temperature, so that the hydrogen gas is not warmed while flowing in the piping, and the hydrogen gas is excessively cooled in advance in the heat exchanger. There is no need to do. Therefore, it is possible to provide a hydrogen gas cooling device that can further reduce the size of the entire device or that can improve the cooling capacity without changing the device size.

  According to the third aspect of the hydrogen gas cooling device of the present invention, liquefied gas is generated by vaporization, and heat exchange is performed between the exhaust gas discharged from the head tank and the uncooled hydrogen gas. A first auxiliary heat exchanger for precooling the hydrogen gas is provided in front of the main heat exchanger. Thereby, the uncooled hydrogen gas before being introduced into the main heat exchanger can be precooled. In addition, an auxiliary heat exchanger that performs heat exchange between the exhaust gas and the hydrogen gas after cooling is configured to be provided at a stage subsequent to the main heat exchanger. As a result, the cooled hydrogen gas can be additionally cooled and kept at a low temperature, so that the hydrogen gas is not warmed while flowing in the piping, and the hydrogen gas is excessively cooled in advance in the heat exchanger. There is no need to do. Therefore, it is possible to provide a hydrogen gas cooling device that can further reduce the size of the entire device or that can improve the cooling capacity without changing the device size.

  Moreover, according to the 4th aspect of the hydrogen gas cooling device of this invention, it has the structure by which the heat exchange promotion means is provided in the outer peripheral part of the inner tube | pipe of a main heat exchanger. As a result, heat exchange in the main heat exchanger can be promoted, so that even when the size of the main heat exchanger is reduced, a cooling capacity equivalent to that in the case of using the main heat exchanger of the conventional size is obtained. It is done. Therefore, it is possible to provide a hydrogen gas cooling device that can further reduce the size of the entire device or that can improve the cooling capacity without changing the device size.

  Furthermore, according to the fifth aspect of the hydrogen gas cooling device of the present invention, the heat exchange promoting member is filled in the outer tube of the main heat exchanger. As a result, heat exchange in the main heat exchanger can be promoted, so that even when the size of the main heat exchanger is reduced, a cooling capacity equivalent to that in the case of using the main heat exchanger of the conventional size is obtained. It is done. Therefore, it is possible to provide a hydrogen gas cooling device that can further reduce the size of the entire device or that can improve the cooling capacity without changing the device size.

It is a schematic block diagram which shows the hydrogen gas cooling device which is 1st Embodiment to which this invention is applied. It is a figure for demonstrating an example of the heat exchange acceleration | stimulation means used for the hydrogen gas cooling device which is one Embodiment to which this invention is applied, and is an enlarged side view which shows the inner pipe | tube vicinity of a main heat exchanger. It is a figure for demonstrating the other example of the heat exchange promotion means used for the hydrogen gas cooling device which is one Embodiment to which this invention is applied, and is an expanded sectional view of the inner pipe vicinity of a main heat exchanger. It is a schematic block diagram which shows the hydrogen gas cooling device which is 2nd Embodiment to which this invention is applied. It is a schematic block diagram which shows the hydrogen gas cooling device which is 3rd Embodiment to which this invention is applied. It is a schematic block diagram which shows the conventional hydrogen gas cooling device.

Hereinafter, a hydrogen gas cooling apparatus according to an embodiment to which the present invention is applied will be described in detail with reference to the drawings.
In addition, in the drawings used in the following description, in order to make the features easy to understand, there are cases where the portions that become the features are enlarged for the sake of convenience, and the dimensional ratios of the respective components are not always the same as the actual ones. Absent.

<First Embodiment>
First, a configuration of a hydrogen gas cooling device (hereinafter simply referred to as “cooling device”) according to a first embodiment to which the present invention is applied will be described.
As shown in FIG. 1, the cooling device 1 of the present embodiment supplies a main heat exchanger 2 that cools hydrogen gas by exchanging heat between hydrogen gas and a liquefied gas, and supplies the main heat exchanger 2 to the main heat exchanger 2. The head tank 3 for storing the liquefied gas to be generated, and the liquefied gas is vaporized and generated, and heat exchange is performed between the exhaust gas discharged from the head tank 3 and the uncooled hydrogen gas to reserve hydrogen gas. And an auxiliary heat exchanger 4 for cooling.

The main heat exchanger 2 has a double tube structure including a straight tubular inner tube 5 and a straight tubular outer tube 6 provided coaxially outside the inner tube 5.
The main heat exchanger 2 is installed in an upright state so that the axes of the inner tube 5 and the outer tube 6 are along the vertical direction or a direction slightly inclined from the vertical direction.

  The inner pipe 5 is the one in which the hydrogen gas to be cooled flows. The inner pipe 5 has an inner diameter of 2 to 10 mm, an outer diameter of 10 to 30 mm, a length of about 500 to 2000 mm, and is made of a metal material considering low temperature hydrogen embrittlement, such as SUS316L. It will be. The inner pipe 5 penetrates the top and bottom of the outer pipe 6 in a liquid-tight manner, and the upper part that penetrates is an inlet 5a and the lower part is an outlet 5b.

The outer tube 6 stores therein a low-temperature liquefied gas that functions as a cooling medium such as liquefied nitrogen, and is made of stainless steel having an inner diameter of 40 to 60 mm, an outer diameter of 45 to 80 mm, and a length of about 500 to 2000 mm. is there. The upper part of the outer tube 6 is a bellows 7 that can expand and contract in the longitudinal direction. The position of the bellows 7 is not limited to the upper part, and may be anywhere on the outer tube 6.
The top and bottom of the outer tube 6 are closed. The outside of the outer tube 6 is covered with a heat insulating material (not shown), and is configured to prevent heat from entering the liquefied gas from the outside.

  In the present embodiment, it is preferable that heat exchange promoting means is provided on the outer peripheral portion of the inner tube 5 of the main heat exchanger 2. An example of the heat exchange promoting means is a metal wire. Specifically, as shown in FIG. 2, the metal wire 5 c is wound around the outer peripheral portion of the inner tube 5 so as to be in close contact with the inner tube 5. Thus, by winding the metal wire 5c around the inner tube 5, the heat transfer area between the inner tube 5 side and the low-temperature liquefied gas stored in the outer tube 6 increases, so heat exchange is promoted. The Therefore, the main heat exchanger 2 can be downsized (particularly shortened in the length direction) with a simple structure. In addition, as a specific example of the metal wire 5c, a stainless steel wire, an aluminum wire, a copper wire, etc. are mentioned, However, A stainless steel wire is preferable from the reason of the improvement of heat exchange efficiency. The metal wire 5c is preferably wound around the entire outer peripheral portion of the inner tube 5. Thereby, the full length of the main heat exchanger 2 can be shortened.

  Another example of the heat exchange promoting means is a fin. Specifically, as shown in FIG. 3, a plurality of fins 5 d (four in FIG. 3) are provided on the outer periphery of the inner tube 5. Thus, heat exchange is promoted by providing the plurality of fins 5d on the outer periphery of the inner tube 5.

  Moreover, in this embodiment, it is preferable that the outer tube 6 of the main heat exchanger 2 is filled with a heat exchange promoting member. Specific examples of the heat exchange promoting member include a lessing ring, a Raschig ring, a pole ring, and a saddle. By filling the outer tube 6 with one or more of these mixtures and allowing them to be present around the inner tube 5, heat exchange is promoted in the same manner as the heat exchange promoting means described above. The heat exchange promoting member is preferably packed in the entire inside of the outer tube 6. The heat exchange promoting member can be used in place of the heat exchange promoting means or in combination with the heat exchange promoting means.

The head tank 3 is provided for storing liquefied gas such as liquefied nitrogen. The head tank 3 is disposed at a position above the top of the main heat exchanger 2 and is preferably placed about 30 to 50 cm above the top of the main heat exchanger 2.
The bottom part of the head tank 3 and the bottom part of the outer pipe 6 of the main heat exchanger 2 are connected by a liquefied gas supply pipe 8, and the liquefied gas flows down from the head tank 3 into the outer pipe 6 depending on the height difference. It has become so.

The head tank 3 is connected to a supply pipe 9 for supplying liquefied gas from a liquefied gas supply source (not shown), and a predetermined amount of liquefied gas is provided by a liquid level control mechanism including a liquid level gauge 10 and a liquid level adjusting valve. Can always be stored.
Further, a preliminary cooling gas supply pipe 11 is connected to the upper part of the head tank 3 so that exhaust gas composed of vaporized liquefied gas is introduced into the auxiliary heat exchanger 4.

  The auxiliary heat exchanger 4 is generated by vaporizing the liquefied gas in the head tank 3 and exchanging heat between the exhaust gas discharged from the head tank 3 and uncooled hydrogen gas to generate hydrogen gas. In order to perform pre-cooling, it is provided upstream of the main heat exchanger 2.

The auxiliary heat exchanger 4 has a double tube structure including a straight tubular inner tube 12 and a straight tubular outer tube 13 provided coaxially outside the inner tube 12.
The auxiliary heat exchanger 4 is installed in a standing state so that the axes of the inner tube 12 and the outer tube 13 are along the vertical direction. However, the auxiliary heat exchanger 4 is installed in a horizontal direction, bent, etc. The shape can be arbitrary.

  The inner pipe 12 has a hydrogen gas before cooling, that is, a hydrogen gas before introduction into the main heat exchanger 2, and has an inner diameter of 2 to 10 mm, an outer diameter of 10 to 30 mm, and a length of 500 mm to 10 m, preferably It is about 500 to 2000 mm in length and is made of a metal material considering low temperature hydrogen embrittlement, such as SUS316L. The inner pipe 12 penetrates the top and bottom of the outer pipe 13 in an airtight manner, and the upper part that penetrates serves as an inlet 12a and the lower part serves as an outlet 12b.

The outer tube 13 is a liquefied gas vaporized in the head tank 3 on the inner side, and the exhaust gas discharged from the head tank 3 flows, and has an inner diameter of 40 to 60 mm, an outer diameter of 45 to 80 mm, and a length of 500 mm to 10 m. Preferably, it is made of stainless steel having a length of about 500 to 2000 mm.
The top and bottom of the outer tube 13 are closed. The outer side of the outer tube 13 is covered with a heat insulating material (not shown), and configured to prevent heat from entering the exhaust gas from the outside.

  Furthermore, the upper part of the head tank 3 and the bottom part of the outer pipe 13 of the auxiliary heat exchanger 4 are connected by the above-described preliminary cooling gas supply pipe 11, and the liquefied gas is discharged from the head tank 3 into the outer pipe 13. Gas is supplied. Furthermore, an exhaust pipe 14 is connected to the upper part of the outer pipe 13 of the auxiliary heat exchanger 4 and exhaust gas after preliminarily cooling hydrogen gas, that is, after exchanging heat with uncooled hydrogen gas. Are discharged out of the system.

Return pipes 15 are respectively connected to five side surfaces of the outer pipe 6 of the main heat exchanger 2 having different heights in the vertical direction, and these return pipes 15 are opened and closed (not shown) provided respectively. The return mother pipe 16 is connected to the head tank 3 through a valve.
As a result, the liquefied gas in the outer pipe 6 passes through the return pipe 15 and an open / close valve (not shown) together with bubbles generated by partial vaporization, and ascends the return mother pipe 16 to return to the head tank 3. It is configured. Further, the liquefied gas that has returned to the head tank 3 flows into the liquefied gas supply pipe 8 again, and naturally circulates between the main heat exchanger 2 and the head tank 3.

A hydrogen gas inflow pipe 17 is connected to the inlet 12 a at the top of the inner pipe 12 of the auxiliary heat exchanger 4. In addition, an upper inlet 5 a of the inner pipe 5 of the main heat exchanger 2 is connected to the lower outlet 12 b of the inner pipe 12 of the auxiliary heat exchanger 4. Further, a hydrogen gas outflow pipe 18 is connected to the outlet 5 b at the lower part of the inner pipe 5 of the main heat exchanger 2.
The hydrogen gas inflow pipe 17 feeds hydrogen gas to be cooled to the inner pipe 12 of the auxiliary heat exchanger 4 before supplying the main gas to the main heat exchanger 2. A flow rate adjusting mechanism is provided to control the flow rate of hydrogen gas fed into the inner tube 12.

The hydrogen gas outflow pipe 18 is for supplying the hydrogen gas cooled by the main heat exchanger 2 to an external hydrogen automobile or the like, and a thermometer 20 for measuring the temperature and a pressure gauge for measuring the pressure (illustrated). (Not shown) and a pressure transmitter (not shown) are provided.
The hydrogen gas temperature signal from the thermometer 20 is sent to a flow rate adjusting valve 19 provided in the hydrogen gas inflow pipe 17 and based on the temperature of the hydrogen gas flowing through the hydrogen gas outflow pipe 18, the inner pipe 12 of the auxiliary heat exchanger 4. The flow rate of the hydrogen gas fed into is controlled.

Further, a bypass pipe 21 that directly connects the hydrogen gas inflow pipe 17 and the hydrogen gas outflow pipe 18 is provided. The bypass pipe 21 is connected in parallel to the inner pipe 12 of the auxiliary heat exchanger 4 and the inner pipe 5 of the main heat exchanger 2, and a part of the hydrogen gas flowing through the hydrogen gas inflow pipe 17. Flows through the bypass pipe 21 directly to the hydrogen gas outflow pipe 18.
The bypass pipe 21 is provided with a flow rate adjusting valve 22, and the flow rate adjusting valve 22 is adjusted in opening degree based on the hydrogen gas temperature signal from the thermometer 20 and the hydrogen gas flowing through the bypass pipe 21 is adjusted. The flow rate is adjusted.

Next, an operation method of the hydrogen gas cooling device 1 of the present embodiment will be described.
First, hydrogen gas having a temperature of 0 to 40 ° C. and a pressure of 0 to 90 MPa (gauge pressure) is introduced from the hydrogen gas inflow pipe 17, and the flow rate thereof is adjusted by the flow rate adjusting valve 19 to the inner pipe 12 of the auxiliary heat exchanger 4. Send it in.
On the other hand, in the head tank 3, exhaust gas consisting of vaporized liquefied gas is supplied from the head tank 3 into the outer pipe 13 of the auxiliary heat exchanger 4 through the preliminary cooling gas supply pipe 11.

The hydrogen gas supplied to the inner pipe 12 of the auxiliary heat exchanger 4 is precooled by flowing through the inner pipe 12 and contacting the wall surface thereof, and has a temperature of -196 to 0 ° C and a pressure of 0 to 90 MPa (gauge pressure). It is led out from the outlet 12 b as precooled hydrogen gas and supplied to the inner pipe 5 of the main heat exchanger 2.
The exhaust gas in the outer pipe 13 of the auxiliary heat exchanger 4 is discharged out of the system from the exhaust pipe 14 after cooling the hydrogen gas.

Next, hydrogen gas preliminarily cooled by the auxiliary heat exchanger 4 and having a temperature of −196 to 0 ° C. and a pressure of 0 to 90 MPa (gauge pressure) is fed into the inner pipe 5 of the main heat exchanger 2.
On the other hand, liquefied gas such as liquefied nitrogen is supplied from the head tank 3 through the liquefied gas supply pipe 8 into the outer pipe 6 of the main heat exchanger 2 and stored in the outer pipe 6.

The hydrogen gas supplied to the inner pipe 5 of the main heat exchanger 2 is cooled by flowing through the inner pipe 5 and coming into contact with the wall surface, and the temperature from the hydrogen gas outlet pipe 18 is -196 to 0 ° C., and the pressure is 0 to 90 MPa. It is derived as (gauge pressure) cooled hydrogen gas and supplied to hydrogen automobiles and the like.
On the other hand, the liquefied gas in the outer pipe 6 of the main heat exchanger 2 is heated by cooling the hydrogen gas, and a part of the liquefied gas is vaporized into bubbles and mixed with the liquefied gas.

  The liquefied gas containing bubbles has a low apparent density, rises in the outer pipe 6, passes through the return pipe 15 and an on-off valve (not shown), and further rises the return mother pipe 16 to raise the head tank 3. Return to. The gaseous liquefied gas contained in the liquefied gas returned to the head tank 3 is separated here and supplied to the auxiliary heat exchanger 4 from the preliminary cooling gas supply pipe 11, and the liquefied gas is stored in the head tank 3 and again. Provided for use.

  During this operation, the temperature of the cooling hydrogen gas flowing through the hydrogen gas outlet pipe 18 is monitored by the thermometer 20, and when the temperature deviates from the target temperature, a control signal from the thermometer 20 is provided in the hydrogen gas inlet pipe 17. The flow rate adjusting valve 19 and the flow rate adjusting valve 22 provided in the bypass pipe 21 are transmitted to the flow rate adjusting valve 19 and the opening degree of the flow rate adjusting valves 19 and 22 to adjust the opening of the hydrogen gas inflow pipe 17 or the bypass pipe 21. The flow rate of the gas is changed so that a cooled hydrogen gas having a target temperature is obtained.

  Further, the liquefied gas stored in the outer pipe 6 is opened and closed by opening and closing some of the on-off valves (not shown) of the five return pipes 15 attached to the outer pipe 6 of the main heat exchanger 2. The liquid level can be changed. This change in the liquid level changes the area (effective heat transfer area) where the inner tube 5 and the liquefied gas are in contact with each other, and the degree of cooling of the hydrogen gas flowing in the inner tube 5 changes. The temperature of the cooling hydrogen gas flowing out to the hydrogen gas outflow pipe 18 can be adjusted.

  The temperature of the inner pipe 5 and the outer pipe 6 of the main heat exchanger 2 changes due to storage and discharge of liquefied gas, inflow of hydrogen gas, etc., and the length in the tube axis direction expands and contracts with this temperature change. . This expansion and contraction is absorbed by the bellows 7 of the outer tube 6. For this reason, inconveniences such as damage to the main heat exchanger 2 due to expansion and contraction of the inner tube 5 and the outer tube 6 do not occur.

  According to the hydrogen gas cooling device 1 of the present embodiment, the liquefied gas is vaporized and generated, and heat is exchanged between the exhaust gas discharged from the head tank 3 and the uncooled hydrogen gas to generate the hydrogen gas. An auxiliary heat exchanger 4 for pre-cooling is provided, and this auxiliary heat exchanger 4 is provided in the front stage of the main heat exchanger 2, so that uncooled hydrogen gas before being introduced into the main heat exchanger 2 is removed. Can be precooled. Thus, since the exhaust gas from the head tank that has been exhausted outside the system can be used for preliminary cooling, the consumption of liquefied gas as a refrigerant can be reduced. Thereby, even if it is a case where the dimension of the height direction of the vertical type main heat exchanger 2 is made small, the cooling capability equivalent to the case where the main heat exchanger of the conventional size is used is obtained.

  In addition, since the auxiliary heat exchanger 4 uses gas on both the cooling side and the cooled side, a space-saving heat exchanger such as a double pipe heat exchanger can be used. Thereby, since it becomes possible to install the auxiliary heat exchanger 4 in the dead space in the cooling device 1, there is no possibility that the size of the device will be increased. Therefore, it is possible to provide the hydrogen gas cooling device 1 that can further reduce the size of the entire device or that can improve the cooling capacity without changing the device size.

  Further, according to the hydrogen gas cooling device 1 of the present embodiment, the heat exchange promoting means is provided on the outer peripheral portion of the inner tube 5 of the main heat exchanger 2. Thereby, since the metal path which conveys the cold heat | fever of liquefied gas to the inner pipe 5 is ensured by the contact length of the inner pipe 5 and a metal becoming long, the heat exchange in the main heat exchanger 2 can be accelerated | stimulated. . Therefore, even when the vertical size of the main heat exchanger 2 is reduced, a cooling capacity equivalent to that obtained when the main heat exchanger of the conventional size is used can be obtained.

  Furthermore, according to the hydrogen gas cooling device 1 of the present embodiment, the heat exchange promoting member is filled in the outer tube 6 of the main heat exchanger 2. Thereby, since the metal path which conveys the cold heat | fever of liquefied gas to the inner pipe 5 is ensured by the contact length of the inner pipe 5 and a metal becoming long, the heat exchange in the main heat exchanger 2 can be accelerated | stimulated. . Therefore, even when the vertical size of the main heat exchanger 2 is reduced, a cooling capacity equivalent to that obtained when the main heat exchanger of the conventional size is used can be obtained.

  Furthermore, according to the hydrogen gas cooling device 1 of the present embodiment, the temperature of the cooling hydrogen gas can be adjusted by the three means of the flow rate adjusting valves 19 and 22 and the return pipe 15, so that the flow rate of the hydrogen gas is Even if it fluctuates significantly, the temperature of the cooling hydrogen gas can always be kept in the target temperature range.

<Second Embodiment>
Next, the configuration of the hydrogen gas cooling device according to the second embodiment to which the present invention is applied will be described.
In the present embodiment, the hydrogen gas cooling device 1 of the first embodiment differs from the auxiliary heat exchanger 4 provided in the front stage of the main heat exchanger 2 in place of the auxiliary heat exchange in the rear stage of the main heat exchanger 2. It has a different configuration in that the vessel 24 is provided. Therefore, about the structure of the hydrogen gas cooling device of this embodiment, the same code | symbol is attached | subjected about the component same as 1st Embodiment, and description is abbreviate | omitted.

  As shown in FIG. 4, the cooling device 41 according to the present embodiment includes a main heat exchanger 2, a head tank 3, a liquefied gas generated by vaporization, and exhaust gas discharged from the head tank 3 and cooling. And an auxiliary heat exchanger 24 that performs heat exchange with the subsequent hydrogen gas to further cool the hydrogen gas and keep it at a low temperature.

  The auxiliary heat exchanger 24 of this embodiment exchanges heat between the exhaust gas generated by vaporizing the liquefied gas in the head tank 3 and the exhaust gas discharged from the head tank 3 and the hydrogen gas after cooling. In order to further cool the hydrogen gas and keep it at a low temperature, it is provided after the main heat exchanger 2.

The auxiliary heat exchanger 24 has a double tube structure in which the hydrogen gas outlet pipe 18 is an inner pipe and a straight tubular outer pipe 25 is coaxially provided outside the hydrogen gas outlet pipe 18.
The auxiliary heat exchanger 24 is installed in a standing state so that the axes of the hydrogen gas outflow pipe 18 and the outer pipe 25 that are inner pipes are along the vertical direction, installed in a horizontal direction, bent, etc. The installation state and shape can be arbitrary.

  The hydrogen gas outflow pipe 18 which is an inner pipe in the auxiliary heat exchanger 24 of the present embodiment penetrates the introduction part and the lead-out part of the outer pipe 25 in an airtight manner. The penetrating introduction part is an inlet 18a, and the lead-out part is It is an outlet 18b.

The outer tube 25 is a liquefied gas vaporized in the head tank 3 on the inner side, and the exhaust gas discharged from the head tank 3 flows, and has an inner diameter of 40 to 60 mm, an outer diameter of 45 to 80 mm, and a length of 500 mm to 10 m. Preferably, it is made of stainless steel having a length of about 500 to 2000 mm. In the cooling device 41 of the present embodiment, it is preferable that all the hydrogen gas outflow pipes 18 on the downstream side of the main heat exchanger 2 have a double pipe structure, that is, the auxiliary heat exchanger 24.
Further, the end portions on the introduction side and the lead-out side of the outer tube 25 are closed. The outer side of the outer tube 25 is covered with a heat insulating material (not shown) so as to prevent heat from entering the exhaust gas from the outside.

  The upper part of the head tank 3 and the end of the outer pipe 25 on the inlet 18a side are connected by an additional cooling gas supply pipe 26, and exhaust gas in which liquefied gas is vaporized is supplied from the head tank 3 into the outer pipe 25. It is like that. Further, an exhaust pipe 27 is connected to the end of the outer pipe 25 on the outlet 18b side, and after the hydrogen gas is further cooled, that is, the exhaust gas after the cooled hydrogen gas is kept at a low temperature is discharged out of the system. It has come to be.

  As described above, according to the cooling device 41 of the present embodiment, the auxiliary heat exchanger 24 is provided at the subsequent stage of the main heat exchanger 2, and the hydrogen cooled by the main heat exchanger 2. By cooling the gas with the exhaust gas discharged from the head tank 3, it can be kept at a low temperature. For this reason, the hydrogen gas is not warmed while flowing in the hydrogen gas outflow pipe 18, and it is not necessary to preliminarily cool the hydrogen gas in the main heat exchanger 2. Therefore, it is possible to provide the cooling device 41 that can further reduce the size of the entire device or that can improve the cooling capacity without changing the device size.

<Third Embodiment>
Next, a configuration of a hydrogen gas cooling device according to a third embodiment to which the present invention is applied will be described.
In the present embodiment, the auxiliary heat exchanger 4 provided in the preceding stage of the main heat exchanger 2 in the hydrogen gas cooling device 1 of the first embodiment and the main heat exchange in the hydrogen gas cooling device 41 of the second embodiment. The auxiliary heat exchanger 24 provided in the rear stage of the unit 2 is provided with both. Therefore, about the structure of the hydrogen gas cooling device of this embodiment, the same code | symbol is attached | subjected about the component same as 1st and 2nd embodiment, and description is abbreviate | omitted.

  As shown in FIG. 5, the cooling device 51 of the present embodiment includes a main heat exchanger 2, a head tank 3, liquefied gas generated by vaporization, and exhaust gas discharged from the head tank 3 and unreacted gas. Heat is exchanged between the auxiliary heat exchanger 4 (first auxiliary heat exchanger) for preliminarily cooling the hydrogen gas by performing heat exchange with the cooled hydrogen gas, and between the exhaust gas and the cooled hydrogen gas. An auxiliary heat exchanger 24 (second auxiliary heat exchanger) that performs replacement and additionally cools the hydrogen gas to keep it at a low temperature is schematically configured.

A preliminary cooling gas supply pipe 11 and an additional cooling gas supply pipe 26 are connected to the upper part of the head tank 3, and the outer pipe 13 of the auxiliary heat exchanger 4 that is the first auxiliary heat exchanger is connected from the head tank 3. The exhaust gas vaporized from the liquefied gas can be supplied into the inner pipe and the outer pipe 25 of the auxiliary heat exchanger 24 which is the second auxiliary heat exchanger.
The preliminary cooling gas supply pipe 11 and the additional cooling gas supply pipe 26 may be separately connected to the head tank 3 as shown in FIG. 5 or may be provided so as to be branched in the middle.
Further, the supply amount of the exhaust gas from the head tank 3 to the preliminary cooling gas supply pipe 11 and the additional cooling gas supply pipe 26 may be appropriately changed according to the purpose of cooling the hydrogen gas.

  As described above, according to the cooling device 51 of the present embodiment, the liquefied gas is vaporized and generated, and heat exchange is performed between the exhaust gas discharged from the head tank 3 and the uncooled hydrogen gas. A first auxiliary heat exchanger 4 for precooling the hydrogen gas is provided in front of the main heat exchanger 2. Thereby, the uncooled hydrogen gas before being introduced into the main heat exchanger 2 can be precooled. In addition, an auxiliary heat exchanger 24 that performs heat exchange between the exhaust gas and the cooled hydrogen gas is provided in the subsequent stage of the main heat exchanger 2. As a result, the cooled hydrogen gas can be additionally cooled and kept at a low temperature, so that the hydrogen gas is not warmed while flowing through the hydrogen gas outflow pipe 18. There is no need to overcool the hydrogen gas. Therefore, it is possible to provide the cooling device 51 that can further reduce the size of the entire device or can improve the cooling capacity without changing the device size.

<Fourth Embodiment>
Next, the configuration of a hydrogen gas cooling device according to a fourth embodiment to which the present invention is applied will be described.
This embodiment is different from the hydrogen gas cooling device 1 of the first embodiment in that the auxiliary heat exchanger 4 is not provided. Therefore, regarding the configuration of the hydrogen gas cooling device of the present embodiment, the same components as those in the first to third embodiments are denoted by the same reference numerals and description thereof is omitted.

  The cooling device of the present embodiment includes a main heat exchanger 2 that cools hydrogen gas by exchanging heat between hydrogen gas and liquefied gas, and a head tank that stores liquefied gas supplied to the main heat exchanger 2. 3 and is schematically configured. And the heat exchange promotion means is provided in the outer peripheral part of the inner tube | pipe 5 of the said main heat exchanger 2, It is characterized by the above-mentioned.

  According to the hydrogen gas cooling device of the present embodiment, heat exchange promoting means such as the metal wire 5c and the fins 5d are provided on the outer peripheral portion of the inner tube 5 of the main heat exchanger 2. Thereby, since heat exchange in the main heat exchanger 2 can be promoted, even when the size of the vertical main heat exchanger 2 in the height direction is reduced, the main heat exchanger of the conventional size is reduced. A cooling capacity equivalent to that used is obtained. In addition, when the size of the main heat exchanger 2 is the same as that of the conventional main heat exchanger, the cooling capacity can be improved. Therefore, it is possible to provide a hydrogen gas cooling device that can further reduce the size of the entire device or that can improve the cooling capacity without changing the device size.

<Fifth Embodiment>
Next, the configuration of a hydrogen gas cooling device according to a fifth embodiment to which the present invention is applied will be described.
The present embodiment is different from the hydrogen gas cooling device of the first embodiment in that the auxiliary heat exchanger 4 is not provided. Moreover, it differs from the hydrogen gas cooling device of the fourth embodiment in that it does not have heat exchange promoting means. Therefore, regarding the configuration of the hydrogen gas cooling device of the present embodiment, the same components as those in the first to fourth embodiments are denoted by the same reference numerals and description thereof is omitted.

  The cooling device of the present embodiment includes a main heat exchanger 2 that cools hydrogen gas by exchanging heat between hydrogen gas and liquefied gas, and a head tank that stores liquefied gas supplied to the main heat exchanger 2. 3 and is schematically configured. And the heat exchange promotion member is filled in the outer tube 6 of the main heat exchanger 2.

  According to the hydrogen gas cooling device of the present embodiment, the outer pipe 6 of the main heat exchanger 2 is filled with heat exchange promoting members such as a Lessing ring, Raschig ring, a pole ring, and a saddle. Thereby, since heat exchange in the main heat exchanger 2 can be promoted, even when the size of the vertical main heat exchanger 2 in the height direction is reduced, the main heat exchanger of the conventional size is reduced. A cooling capacity equivalent to that used is obtained. In addition, when the size of the main heat exchanger 2 is the same as that of the conventional main heat exchanger, the cooling capacity can be improved. Therefore, it is possible to provide a hydrogen gas cooling device that can further reduce the size of the entire device or that can improve the cooling capacity without changing the device size.

  The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, in the first to fifth embodiments, the number of return pipes 15 connected to the outer pipe 6 of the main heat exchanger 2 is five. However, the present invention is not limited to this, and one or more return pipes may be used. The higher the number, the more precise temperature control of the cooling hydrogen gas becomes possible.

  In the first to fifth embodiments, the upper part of the inner pipe 5 of the main heat exchanger 2 is the hydrogen gas inlet 5a and the lower part is the hydrogen gas outlet 5b. However, the present invention is not limited to this. is not. For example, similarly to the conventional hydrogen gas cooling apparatus 101 shown in FIG. 6, the lower part of the inner pipe may be used as the inlet and the upper part may be used as the outlet.

1, 41, 51 ... Cooling device (hydrogen gas cooling device)
2 ... Main heat exchanger 3 ... Head tank 4 ... Auxiliary heat exchanger (first auxiliary heat exchanger)
5 ... Inner pipe 5c ... Metal wire (heat exchange promoting means)
5d ... Fin (heat exchange promoting means)
6 ... Outer pipe 7 ... Bellows 8 ... Liquefied gas supply pipe 9 ... Replenishment pipe 10 ... Level gauge 11 ... Preliminary cooling gas supply pipe 12 ... Inner pipe 13 ... Outer pipe 14 ... Exhaust pipe 15 ... Return pipe 16 ... Return mother pipe 17 ... Hydrogen gas inflow pipe 18 ... Hydrogen gas outflow pipes 19, 22 ... Flow rate adjusting valve 20 ... Thermometer 21 ... Bypass pipe 24 ... Auxiliary heat exchanger (second auxiliary heat exchanger)
25 ... Outer pipe 26 ... Additional cooling gas supply pipe 27 ... Exhaust pipe

Claims (11)

A main heat exchanger that performs heat exchange between the hydrogen gas and the liquefied gas to cool the hydrogen gas;
A head tank for storing liquefied gas supplied to the main heat exchanger,
The main heat exchanger has a double tube structure including an inner tube and an outer tube, hydrogen flows into the inner tube, liquefied gas is filled in the outer tube, and the tube axis of the double tube is in the vertical direction. Alternatively, a liquefied gas supply pipe that is arranged in an oblique direction and supplies a liquefied gas from the head tank is connected to the bottom of the outer pipe, and the liquefied gas is supplied to the head at a position above the bottom of the outer pipe. A return pipe is provided to return to the tank,
The head tank is a hydrogen gas cooling device that is disposed above the bottom of the head tank beyond the top of the main heat exchanger,
An auxiliary heat exchanger that preliminarily cools the hydrogen gas by exchanging heat between the exhaust gas generated by the vaporization of the liquefied gas and the exhaust gas discharged from the head tank and the uncooled hydrogen gas ,
The hydrogen gas cooling device, wherein the auxiliary heat exchanger is provided in a stage preceding the main heat exchanger. A main heat exchanger that performs heat exchange between the hydrogen gas and the liquefied gas to cool the hydrogen gas;
A head tank for storing liquefied gas supplied to the main heat exchanger,
The main heat exchanger has a double tube structure including an inner tube and an outer tube, hydrogen flows into the inner tube, liquefied gas is filled in the outer tube, and the tube axis of the double tube is in the vertical direction. Alternatively, a liquefied gas supply pipe that is arranged in an oblique direction and supplies a liquefied gas from the head tank is connected to the bottom of the outer pipe, and the liquefied gas is supplied to the head at a position above the bottom of the outer pipe. A return pipe is provided to return to the tank,
The head tank is a hydrogen gas cooling device that is disposed above the bottom of the head tank beyond the top of the main heat exchanger,
The liquefied gas is vaporized and generated, and heat is exchanged between the exhaust gas exhausted from the head tank and the cooled hydrogen gas to further cool the hydrogen gas and keep it at a low temperature. With a heat exchanger,
The hydrogen gas cooling device, wherein the auxiliary heat exchanger is provided at a stage subsequent to the main heat exchanger. A main heat exchanger that performs heat exchange between the hydrogen gas and the liquefied gas to cool the hydrogen gas;
A head tank for storing liquefied gas supplied to the main heat exchanger,
The main heat exchanger has a double tube structure including an inner tube and an outer tube, hydrogen flows into the inner tube, liquefied gas is filled in the outer tube, and the tube axis of the double tube is in the vertical direction. Alternatively, a liquefied gas supply pipe that is arranged in an oblique direction and supplies a liquefied gas from the head tank is connected to the bottom of the outer pipe, and the liquefied gas is supplied to the head at a position above the bottom of the outer pipe. A return pipe is provided to return to the tank,
The head tank is a hydrogen gas cooling device that is disposed above the bottom of the head tank beyond the top of the main heat exchanger,
A first auxiliary heat exchange is performed in which the liquefied gas is vaporized and heat exchange is performed between the exhaust gas discharged from the head tank and the uncooled hydrogen gas to precool the hydrogen gas. And
A second auxiliary heat exchanger that performs heat exchange between the exhaust gas and the hydrogen gas after cooling, and additionally cools the hydrogen gas to maintain a low temperature;
The hydrogen gas cooling device, wherein the first auxiliary heat exchanger is provided in a front stage of the main heat exchanger, and the second auxiliary heat exchanger is provided in a rear stage of the main heat exchanger.   The hydrogen gas cooling device according to any one of claims 1 to 3, wherein heat exchange promoting means is provided on an outer peripheral portion of the inner tube of the main heat exchanger.   The hydrogen gas cooling device according to claim 4, wherein the heat exchange promoting means is a metal wire or a fin wound so as to be in close contact with the inner tube.   The hydrogen gas cooling device according to any one of claims 1 to 5, wherein a heat exchange promoting member is filled in the outer tube of the main heat exchanger.   The hydrogen gas cooling device according to claim 6, wherein the heat exchange promoting member is any one of a lessing ring, a Raschig ring, a pole ring, and a saddle, or a mixture of two or more. A main heat exchanger that performs heat exchange between the hydrogen gas and the liquefied gas to cool the hydrogen gas;
A head tank for storing liquefied gas supplied to the main heat exchanger,
The main heat exchanger has a double tube structure including an inner tube and an outer tube, hydrogen flows into the inner tube, liquefied gas is filled in the outer tube, and the tube axis of the double tube is in the vertical direction. Alternatively, a liquefied gas supply pipe that is arranged in an oblique direction and supplies a liquefied gas from the head tank is connected to the bottom of the outer pipe, and the liquefied gas is supplied to the head at a position above the bottom of the outer pipe. A return pipe is provided to return to the tank,
The head tank is a hydrogen gas cooling device that is disposed above the bottom of the head tank beyond the top of the main heat exchanger,
A hydrogen gas cooling device, characterized in that heat exchange promoting means is provided on an outer peripheral portion of the inner pipe of the main heat exchanger.   The hydrogen gas cooling device according to claim 8, wherein the heat exchange promoting means is a metal wire or a fin wound so as to be in close contact with the inner tube. A main heat exchanger that performs heat exchange between the hydrogen gas and the liquefied gas to cool the hydrogen gas;
A head tank for storing liquefied gas supplied to the main heat exchanger,
The main heat exchanger has a double tube structure including an inner tube and an outer tube, hydrogen flows into the inner tube, liquefied gas is filled in the outer tube, and the tube axis of the double tube is in the vertical direction. Alternatively, a liquefied gas supply pipe that is arranged in an oblique direction and supplies a liquefied gas from the head tank is connected to the bottom of the outer pipe, and the liquefied gas is supplied to the head at a position above the bottom of the outer pipe. A return pipe is provided to return to the tank,
The head tank is a hydrogen gas cooling device that is disposed above the bottom of the head tank beyond the top of the main heat exchanger,
A hydrogen gas cooling device, wherein a heat exchange promoting member is filled in the outer tube of the main heat exchanger.   11. The hydrogen gas cooling device according to claim 10, wherein the heat exchange promoting member is any one of a Lessing ring, a Raschig ring, a Paul ring, and a saddle, or a mixture of two or more thereof.

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