Fuel Vaporizer

Abstract

[Problem] To provide a technology for using gasification equipment for liquefied fuel and supplying, to cold energy utilization equipment, cold seawater adjusted to a desired temperature. [Solution] In this fuel gasification equipment for gasifying a liquefied fuel: an open rack vaporizer (1) vaporizes liquefied fuel using seawater; and a seawater supply line (403) supplies, to the open rack vaporizer (1), seawater used in a condenser (331) for cooling the steam discharged from a steam turbine (33). A cold seawater supply line (502) supplies, to cold energy utilization equipment (6), cold seawater that has decreased in temperature by exchanging heat with liquefied fuel in the open rack vaporizer (1) and a circulating line (501) resupplies a portion of the cold seawater to the open rack vaporizer (1) to adjust the temperature of the cold seawater. [Selected drawing] FIG. 2

Description

[Technical field]

[0001] The present invention relates to a technology for utilizing cold energy obtained when vaporizing liquefied fuel. [Background technology]

[0002] Liquefied natural gas (LNG) and liquefied hydrogen are used as fuels. In order to use fuel, it is necessary to vaporize the liquefied fuel and supply it in a gaseous state to the fuel consumption equipment. One type of equipment for vaporizing liquefied fuel is the open rack vaporizer (ORV), which vaporizes liquefied fuel supplied inside a panel made up of multiple heat transfer tubes by flowing seawater, a heating medium, along the outer surface of the panel.

[0003] On the other hand, in liquefied fuel vaporization equipment, the temperature of the heating medium decreases due to heat exchange with the liquefied fuel, so technologies have been proposed to utilize the cold energy accumulated in the heating medium for temperature regulation in plant factories, etc. (e.g., Patent Documents 1 and 2).

[0004] However, in order to reduce the impact on the environment, there is a restriction on the minimum temperature of seawater discharged from factories that use liquid fuel. Also, while the temperature of seawater may change depending on the weather and season, the vaporization equipment has the highest priority to operate to vaporize the required amount of liquefied fuel. Therefore, the temperature of the seawater discharged from the ORV may also change depending on these conditions. For these reasons, the temperature of the low-temperature seawater (cold seawater) discharged from the ORV may not match the temperature required by cold energy utilization facilities such as plant factories. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2014-31964 A [Patent Document 2] Registered Utility Model No. 3209642 Summary of the Invention [Problem to be solved by the invention]

[0006] The present invention provides a technology that utilizes a liquefied fuel vaporization facility to supply cold seawater adjusted to a desired temperature to a cold energy utilization facility. [Means for solving the problem]

[0007] 1. The present invention is a fuel vaporization system for vaporizing a liquefied fuel, comprising: an open rack vaporizer that vaporizes the liquefied fuel by flowing seawater along outer surfaces of a plurality of heat transfer tubes to which the liquefied fuel is supplied; a seawater supply line for supplying seawater, after being used as a refrigerant in a condenser for cooling steam discharged from a steam turbine for driving a generator, to the open rack evaporator; a cold seawater supply line that supplies the cold seawater used for vaporizing the liquefied fuel in the open rack vaporizer and whose temperature has been reduced by heat exchange with the liquefied fuel to a cold energy utilization facility that utilizes the cold energy of the cold seawater; a circulation line for resupplying a portion of the cold seawater discharged from the open rack vaporizer to the open rack vaporizer to reduce the temperature of the cold seawater to a preset temperature. 、 a cold seawater pit for receiving the cold seawater discharged from the open rack vaporizer, the cold seawater supply line supplies the cold seawater in the cold seawater pit to the cold heat utilization facility, and the circulation line re-supplies the cold seawater in the cold seawater pit to the open rack vaporizer; a seawater supply pit is provided in the seawater supply line, into which seawater flowing through the seawater supply line flows, and which is provided adjacent to the cold seawater pit via a partition wall and configured to receive the cold seawater overflowing from an upper end of the partition wall, and the upper end surface of the partition wall, which is an area into which the cold seawater flows from the cold seawater pit to the seawater supply pit, constitutes the circulation line; By increasing or decreasing the flow rate of the seawater flowing into the seawater supply pit, the flow rate of the cold seawater resupplied from the cold seawater pit to the open rack vaporizer via the seawater supply pit is increased or decreased, thereby adjusting the temperature of the cold seawater; It is characterized by: A second invention is a fuel vaporization system for vaporizing a liquefied fuel, an open rack vaporizer that vaporizes the liquefied fuel by flowing seawater along outer surfaces of a plurality of heat transfer tubes to which the liquefied fuel is supplied; a seawater supply line for supplying seawater, after being used as a refrigerant in a condenser for cooling steam discharged from a steam turbine for driving a generator, to the open rack evaporator; a cold seawater supply line that supplies the cold seawater used for vaporizing the liquefied fuel in the open rack vaporizer and whose temperature has been reduced by heat exchange with the liquefied fuel to a cold energy utilization facility that utilizes the cold energy of the cold seawater; a circulation line for re-supplying a portion of the cold seawater discharged from the open rack vaporizer to the open rack vaporizer to reduce the temperature of the cold seawater to a preset temperature; The present invention is characterized in that it includes an uncooled seawater supply line that supplies seawater that is used as a refrigerant in the condenser and is not cooled in the open rack evaporator to the cold energy utilization equipment.

[0008] The fuel vaporization system may have the following features. (a) The cold energy utilization facility is an aquaculture tank that uses the cold energy of the cold seawater to regulate the temperature of water for cultivating fish and shellfish, or a plant factory that uses the cold energy to regulate the temperature of at least one of the plant growth atmosphere, growth soil, or culture water. (b) The liquefied fuel is liquefied natural gas or liquefied hydrogen. (c In the second invention, The open rack vaporizer has a receiving tank section that receives seawater after it has flowed along the outer surface of the heat transfer tube, the cold seawater supply line supplies the cold seawater in the receiving tank section to the cold heat utilization equipment, and the circulation line supplies the cold seawater in the receiving tank section back to the open rack vaporizer. ( d) before The steam turbine is driven by steam generated in a waste heat boiler of a gas turbine that drives a generator. In this case, a fuel gas supply line is provided to supply the gas obtained by vaporization in the open rack vaporizer to the gas turbine. Effect of the Invention

[0009] According to the present invention, a circulation line is provided for re-supplying to the open rack vaporizer a portion of the cold seawater whose temperature has been reduced by heat exchange for vaporizing liquefied fuel in the open rack vaporizer, so that the temperature of the cold seawater supplied to the cold energy utilization equipment can be adjusted to the desired temperature. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a configuration diagram of a conventional LNG vaporization facility. [Diagram 2] 1 is a configuration diagram of an LNG vaporization facility according to an embodiment. FIG. [Diagram 3] FIG. 11 is a configuration diagram of an LNG vaporization facility according to a second embodiment. [Figure 4] FIG. 11 is a configuration diagram of an LNG vaporization facility according to a third embodiment. [Diagram 5] FIG. 11 is a configuration diagram of an LNG vaporization facility according to a fourth embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Before describing the configuration of a fuel vaporization system according to an embodiment, a configuration example of a fuel vaporization system according to a conventional configuration will be described with reference to Fig. 1. In each of the drawings shown below, an LNG vaporization system that vaporizes liquefied natural gas (LNG) will be described as an example of a liquefied fuel.

[0012] The LNG vaporization facility shown in Fig. 1 is installed alongside a power generation facility. The power generation facility shown in Fig. 1 includes a gas turbine 31 that burns fuel gas to drive a power generator 34, a heat recovery steam generator (HRSG) 32 that recovers heat from the combustion exhaust gas discharged from the gas turbine 31 to generate steam, and a steam generator (SHG) 33 that drives the power generator 34 with the steam generated by the HRSG 32. and an air turbine 33.

[0013] 1 is of a condensing type, and is provided with a condenser 331 that condenses the steam discharged from the steam turbine 33 by heat exchange with seawater serving as a coolant, thereby reducing the back pressure. Seawater (e.g., 20°C) is taken in by a water intake pump 41, supplied to the condenser 331 via a condenser seawater supply line 401, and after heat exchange with the steam, is discharged via a condenser discharge line 402 towards a seawater discharge outlet.

[0014] The LNG vaporization facility vaporizes LNG stored in an LNG tank 2 in an open rack vaporizer (ORV) 1 , and supplies the vaporized fuel gas to a gas turbine 31 via a fuel gas supply line 101 . ORV1 has a known configuration in which seawater is caused to flow down along the outer surface of a panel 11 composed of a number of heat transfer tubes to which LNG is supplied from an LNG tank 2, and the LNG is vaporized through heat exchange with the seawater to obtain fuel gas.

[0015] The ORV 1 shown in FIG. 1 uses a portion of seawater warmed by heat exchange with steam in a condenser 331 (for example, 25° C.) as seawater for vaporizing LNG. As a specific configuration example, seawater is supplied to an ORV seawater supply line 403 that branches off from the above-mentioned condenser discharge line 402 and is connected to the ORV 1 using an ORV supply pump 42. The supply flow rate of seawater is adjusted using a flow rate detector 432 and a flow rate control valve 431 provided in the ORV seawater supply line 403. The seawater used for vaporizing LNG is discharged via an ORV discharge line 404, merges with the above-mentioned condenser discharge line 402, and is discharged toward the water outlet.

[0016] In an LNG vaporization facility having the above-described configuration, seawater whose temperature has been reduced by heat exchange with the LNG is obtained in the ORV 1, and the cold energy of this seawater can be utilized in various cold energy utilization facilities. Examples of uses for cold energy in cold energy utilization equipment include regulating the temperature of culture water in fish and shellfish culture tanks, and regulating the temperature of at least one of the plant growth atmosphere, growth soil, and culture water in a plant factory.

[0017] For example, the water for salmon farming is preferably below 20°C, and for abalone farming it is preferably below 25°C. Also, the soil for strawberry cultivation and the water supplied to said soil are preferably below 15°C. Thus, in cold energy utilization facilities, there are suitable temperatures depending on the purpose of using the cold energy.

[0018] However, in order to reduce the impact on the environment, there is a restriction on the lower limit temperature of the seawater discharged outside, for example, the temperature of the seawater discharged from the outlet needs to be maintained at about 25°C. On the other hand, since ORV1 uses a large amount of seawater, it may be difficult to utilize all of the seawater discharged from ORV1 in the cold energy utilization equipment.

[0019] Therefore, even if a portion of the seawater discharged from the ORV 1 is supplied to the cold energy utilization facility, most of the remaining seawater must be discharged to the outside as it is. If a large amount of low-temperature seawater is discharged, there is a risk that the temperature of the seawater discharged to the discharge outlet will fall below an allowable temperature even after it is merged with the relatively warm seawater flowing through the condenser discharge line 402. For this reason, in the conventional LNG vaporization facility shown in FIG. 1, the seawater temperature at the outlet of the ORV 1 could only be reduced to about 22°C, for example.

[0020] In addition, the temperature of seawater may change depending on the weather and season. Meanwhile, the LNG vaporization facility has the highest priority on performing operation to vaporize LNG at a flow rate that meets the requirements from the gas turbine 31. Therefore, when the temperature of the supplied seawater changes, it may be difficult to maintain the temperature of the seawater discharged from the ORV 1 at the temperature required by the cold energy utilization facility.

[0021] As described above, with conventional LNG vaporization facilities, it was sometimes difficult to stably supply cold seawater at the temperature required for cold energy utilization facilities all year round. The LNG vaporization equipment of this embodiment addresses the above-mentioned problems and has a configuration that can stably supply cold seawater at the temperature required by the cold energy utilization equipment while minimizing the impact on the environment.

[0022] Hereinafter, an example of the overall configuration of an LNG vaporization facility according to an embodiment will be described with reference to Fig. 2. The LNG vaporization facility shown in Fig. 2 is configured to be able to supply a portion of the cold seawater discharged from the ORV 1 to a cold energy utilization facility 6 consisting of an aquaculture tank or a plant factory. 2 to 5 described below, components common to those described using FIG. 1 are denoted by the same reference numerals as those shown in FIG.

[0023] In the LNG liquefaction facility shown in Figure 2, the flow path of seawater discharged from ORV 1 branches into an ORV discharge line 404a for discharging cold seawater toward a discharge outlet, and a cold seawater pit line 404b through which cold seawater flows to be supplied to the cold energy utilization facility 6. The downstream end of the ORV discharge line 404a is connected to the condenser discharge line 402, and the warm seawater and the cold seawater flowing through the ORV discharge line 404a are mixed and discharged toward the outlet. Meanwhile, a cold seawater pit 51 is provided downstream of the cold seawater pit line 404b, and the cold seawater supplied to the cold energy utilization facility 6 is received in this cold seawater pit 51.

[0024] Between the cold seawater pit 51 and the cold energy utilization facility 6, a cold seawater supply line 502 is provided for supplying cold seawater to the cold energy utilization facility 6. The cold seawater flowing into the cold seawater pit 51 is supplied to the cold energy utilization facility 6 via the cold seawater supply line 502 by a liquid feed pump 54 provided upstream of the cold seawater supply line 502. The flow rate of the cold seawater supplied to the cold energy utilization facility 6 is adjusted using a flow rate detection unit 532 and a flow rate control valve 531 provided in the cold seawater supply line 502. In addition, an opening / closing valve 533 is provided in the cold seawater supply line 502, which allows the supply of cold seawater to the cold energy utilization facility 6 to be started or stopped.

[0025] Furthermore, a circulation line 501 for resupplying the cold seawater in the cold seawater pit 51, i.e., a portion of the cold seawater discharged from the ORV 1, to the ORV 1 branches off from the above-mentioned cold seawater supply line 502. The circulation line 501 branches off from the cold seawater supply line 502 at a position upstream of the above-mentioned on-off valve 533, and its downstream end merges with the ORV seawater supply line 403. The ORV seawater supply line 403 corresponds to the seawater supply line in this embodiment.

[0026] The resupply flow rate (circulation flow rate) of cold seawater to ORV1 is adjusted using a temperature detection unit 522 and a flow rate control valve 521 provided in cold seawater pit 51 so that the temperature of the cold seawater in cold seawater pit 51 becomes a preset target temperature (e.g., 15°C). The target temperature of the cold seawater is set to the temperature of cold seawater required by the cold energy utilization facility 6. In addition, an opening / closing valve 523 is provided in the circulation line 501, which can start and stop the resupply of cold seawater to ORV1.

[0027] According to the configuration described above, by resupplying cold seawater to ORV1 via circulation line 501, the temperature of the seawater supplied to ORV1 is reduced (e.g., 18°C) compared to the conventional LNG vaporization equipment described using Figure 1. At this time, from the viewpoint of vaporization of LNG in ORV1, it is sufficient that the supply flow rate of seawater to ORV1, i.e., the total flow rate of the supply flow rate of seawater supplied via the ORV seawater supply line 403 and the circulation flow rate of cold seawater supplied via the circulation line 501, is secured so that the amount of heat required to vaporize the LNG supplied to the gas turbine 31 is secured.

[0028] The operation of the LNG liquefaction facility having the above-described configuration will be described. As in conventional LNG liquefaction facilities, in the ORV 1, seawater supplied via the ORV seawater supply line 403 is caused to flow down along the outer surface of the panel 11, and the LNG is vaporized to obtain fuel gas. A portion of the cold seawater whose temperature has been reduced by heat exchange with the LNG is received in the cold seawater pit 51 via the cold seawater pit line 404b. The remaining cold seawater merges with the condenser discharge line 402 via the ORV discharge line 404a, and is then discharged toward the discharge port.

[0029] Of the cold seawater that flows into the cold seawater pit 51, the portion to be supplied to the cold heat utilization facility 6 is supplied to the cold heat utilization facility 6 via a cold seawater supply line 502 while undergoing flow rate adjustment according to the consumption amount. On the other hand, the circulation flow rate of the cold seawater resupplied to the ORV1 via the circulation line 501 is adjusted according to the temperature of the cold seawater in the cold seawater pit 51. That is, an operation control range is set centered on the target temperature of the cold seawater, and when the temperature of the cold seawater in the cold seawater pit 51 exceeds the upper limit of the operation control range, the circulation flow rate is increased and the temperature of the seawater supplied to the ORV1 is reduced. When the temperature of the cold seawater in the cold seawater pit 51 falls below the lower limit of the operation control range, the circulation flow rate is reduced and the temperature of the seawater supplied to the ORV1 is increased. As a result, cold seawater at a stable temperature within the operation control range can be supplied to the cold energy utilization facility 6.

[0030] The flow rate of cold seawater flowing into the cold seawater pit 51 via the cold seawater pit line 404b is adjusted so as to be balanced with the total flow rate of the supply flow rate to the cold energy utilization facility 6 and the circulation flow rate to the ORV 1. In addition, when the supply of cold seawater to the cold energy utilization equipment 6 is stopped, the opening / closing valves 533 and 523 are closed to stop the discharge and circulation of the cold seawater, and the entire amount of seawater discharged from the ORV 1 is discharged to the outside via the ORV discharge line 404a.

[0031] In the LNG vaporization facility shown in Fig. 2, the temperature of the cold seawater discharged to the outside through the ORV discharge line 404a also drops in response to the temperature of the cold seawater supplied to the cold energy utilization facility 6. However, in this LNG vaporization facility, a portion of the cold seawater is re-supplied to the inlet side of the ORV 1. For this reason, the flow rate of cold seawater discharged outside the cold seawater circulation system including the ORV 1 and the cold seawater pit 51 (i.e., the flow rate of seawater newly supplied from the upstream side of the ORV seawater supply line 403) is significantly smaller than that of the conventional LNG vaporization facility described using Fig. 1.

[0032] The inventors have discovered that in the embodiment shown in Figure 2, the flow rate of cold seawater discharged outside the circulation system can be reduced by approximately 20 to 50 percent compared to the flow rate of seawater discharged from the ORV discharge line 404 to the condenser discharge line 402 in the conventional LNG vaporization equipment shown in Figure 1. Furthermore, because a portion of the cold seawater discharged outside the circulation system is supplied toward the cold energy utilization facility 6, the flow rate of the cold seawater discharged through the ORV discharge line 404a is even smaller. Therefore, even if the temperature of the cold seawater discharged through the ORV discharge line 404a has dropped to 15°C, the temperature of the seawater discharged from the outlet after merging with the seawater discharged through the condenser discharge line 402 can be maintained at a temperature not significantly lower than 25°C.

[0033] The LNG vaporization equipment according to this embodiment has the following advantages: Since the equipment is provided with a circulation line for resupplying to the ORV 1 a portion of the cold seawater whose temperature has been reduced by heat exchange for vaporizing the liquefied fuel in the ORV 1, the temperature of the cold seawater supplied to the cold energy utilization equipment 6 can be adjusted to a desired temperature. In addition, by re-supplying cold seawater to the ORV 1, the flow rate of cold seawater discharged to the outside can be reduced, thereby reducing the impact of cold seawater on the environment.

[0034] Next, variations of the LNG vaporization equipment according to the embodiment will be described with reference to FIGS. 3 shows an example in which a cold seawater supply line pump 54b for the cold seawater supply line 502 and a circulation line pump 54a for the circulation line 501 are independently provided for the cold seawater pit 51. This configuration increases the degree of freedom in adjusting the supply flow rate of cold seawater to the cold energy utilization facility 6 and the circulation flow rate of cold seawater to the ORV 1.

[0035] 3 also shows an example in which an uncooled seawater supply line 503 is provided for supplying a portion of the uncooled seawater discharged from the flow rate control valve 531 to the cold energy utilization facility 6. The uncooled seawater supply line 503 branches off from the condenser discharge line 402 and is connected to the cold energy utilization facility 6, and warm seawater is supplied using an uncooled seawater supply line pump 55. The supply flow rate of seawater is adjusted using a flow rate detection unit 562 and a flow rate control valve 561 provided in the uncooled seawater supply line 503.

[0036] With the above-mentioned configuration, during a period when the temperature of seawater taken in by the intake pump 41 is high (for example, in summer), cold seawater is supplied to the cold energy utilization facility 6 via cold seawater supply line 502. During a period when the temperature of the taken in seawater is low (for example, in winter), relatively warm seawater discharged from flow rate control valve 531 can be supplied via uncooled seawater supply line 503 instead of or in parallel with the supply of cold seawater from cold seawater supply line 502.

[0037] Next, FIG. 4 shows a configuration example in which cold seawater is circulated using pits 51a and 52b instead of the circulation line 501 made of piping shown in FIGS. In the LNG vaporization facility shown in Fig. 4, an ORV seawater supply pit 51b is interposed between the ORV seawater supply lines 403a and 403b, into which seawater flowing through the upstream ORV seawater supply line 403a flows. The ORV seawater supply pit 51b is provided adjacent to a cold seawater pit 51a, through a partition wall 511, into which the entire amount of cold seawater discharged from the ORV 1 through a cold seawater pit line 404b flows. A pit drainage line 404c, through which the cold seawater is discharged toward a discharge port, is connected to the cold seawater pit 51a.

[0038] The partition wall 511 is configured to have a height that allows cold seawater that cannot be contained in the cold seawater pit 51a to overflow toward the ORV seawater supply pit 51b through the upper end of the partition wall 511. In other words, the upper end surface of the partition wall 511, which is the area where the cold seawater flows from the cold seawater pit 51a to the ORV seawater supply pit 51b, forms a circulation line through which the cold seawater flows to be resupplied to the ORV 1.

[0039] An ORV supply pump 42a is provided in the ORV seawater supply pit 51b, and seawater is supplied to the ORV 1 via an ORV seawater supply line 403. A flow rate control valve 431a is provided in the ORV seawater supply line 403a that supplies seawater from the condenser discharge line 402 to the ORV seawater supply pit 51b. The flow rate control valve 431a increases or decreases the flow rate of seawater flowing into the cold seawater pit 51a based on the temperature detection result of a temperature detection unit 433 that detects the seawater temperature in the ORV seawater supply pit 51b so that the temperature of the seawater in the ORV seawater supply pit 51b approaches a target temperature.

[0040] That is, when the temperature of the cold seawater flowing from the cold seawater pit 51a to the ORV seawater supply pit 51b rises and the temperature of the seawater in the ORV seawater supply pit 51b exceeds the upper limit of the operation management range set around the target temperature, the flow control valve 431a is opened wider to increase the flow rate of the seawater received. In accordance with this, the flow rate of the seawater supplied to the ORV 1 is also increased using the ORV supply pump 42a.

[0041] This operation increases the flow rate of cold seawater discharged from the ORV 1, and increases the amount of cold seawater circulating from the cold seawater pit 51a to the ORV seawater supply pit 51b. As a result, the temperature of the cold seawater flowing into the cold seawater pit 51a decreases, and the temperature of the seawater in the ORV seawater supply pit 51b also approaches the target temperature. Note that the amount of seawater in the ORV seawater supply pit 51b and the cold seawater pit 51a is kept constant by adjusting the amount of cold seawater discharged via the pit drainage line 404c, for example.

[0042] On the other hand, when the temperature of the cold seawater flowing from the cold seawater pit 51a to the ORV seawater supply pit 51b falls below the lower limit of the operation control range due to a decrease in the temperature of the seawater in the ORV seawater supply pit 51b, the opening of the flow control valve 431a is reduced to reduce the flow rate of the seawater received. In accordance with this, the flow rate of seawater supplied to the ORV 1 by the ORV supply pump 42a is also reduced.

[0043] This operation reduces the flow rate of cold seawater discharged from the ORV 1, and reduces the amount of cold seawater circulating from the cold seawater pit 51a to the ORV seawater supply pit 51b. As a result, the temperature of the cold seawater flowing into the cold seawater pit 51a drops, and the temperature of the seawater in the ORV seawater supply pit 51b also approaches the target temperature. In this case, too, the amount of seawater in the ORV seawater supply pit 51b and the cold seawater pit 51a is kept constant by adjusting the amount of cold seawater discharged via the pit drainage line 404c, for example.

[0044] 5 shows an example in which pumps 54a, 54b for sending cold seawater to a cold seawater supply line 502 and a circulation line 501 are provided for an ORV pit 12 provided on an ORV 1, instead of the cold seawater pit 51 shown in FIGS. 2 and 3. The ORV pit 12 serves to receive seawater after it flows along the outer surface of a panel 11 that performs heat exchange between LNG and seawater, and is provided on the ORV 1.

[0045] 5, a circulation line 501 for resupplying cold seawater in the ORV pit 12 to the ORV 1, and a pit drain line 404c for discharging cold seawater toward the condenser drain line 402 are connected to the circulation line pump 54a. On the other hand, cold seawater is supplied to the cold heat utilization facility 6 via the cold seawater supply line 502 using the cold seawater supply line pump 54b, similar to the LNG vaporization facility shown in FIG.

[0046] The LNG vaporization equipment according to each embodiment described above with reference to Figs. 2 to 5 may be used as hydrogen vaporization equipment that vaporizes liquefied hydrogen, which is a liquid fuel. In addition, the cold energy utilization facility to which cold seawater is supplied from the fuel vaporization facility of this example is tank For example, cold seawater may be supplied to coolers in chemical plants, oil refineries, etc. [Explanation of symbols]

[0047] 1 ORV 331 Condenser 403, 403a, 403b ORV seawater supply line 404, 404a 501 Circulation Line 502 Cold Seawater Supply Line 6 Cooling and heat utilization equipment

Claims

1. A fuel vaporization system for vaporizing liquefied fuel, comprising: an open rack vaporizer that vaporizes the liquefied fuel by flowing seawater along outer surfaces of a plurality of heat transfer tubes to which the liquefied fuel is supplied; a seawater supply line for supplying seawater, after being used as a refrigerant in a condenser for cooling steam discharged from a steam turbine for driving a generator, to the open rack evaporator; a cold seawater supply line that supplies the cold seawater used for vaporizing the liquefied fuel in the open rack vaporizer and whose temperature has been reduced by heat exchange with the liquefied fuel to a cold energy utilization facility that utilizes the cold energy of the cold seawater; a circulation line for re-supplying a portion of the cold seawater discharged from the open rack vaporizer to the open rack vaporizer to reduce the temperature of the cold seawater to a preset temperature; a cold seawater pit for receiving the cold seawater discharged from the open rack vaporizer, the cold seawater supply line supplies the cold seawater in the cold seawater pit to the cold heat utilization facility, and the circulation line re-supplies the cold seawater in the cold seawater pit to the open rack vaporizer; a seawater supply pit is provided in the seawater supply line, into which seawater flowing through the seawater supply line flows, and which is provided adjacent to the cold seawater pit via a partition wall and configured to receive the cold seawater overflowing from an upper end of the partition wall, and the upper end surface of the partition wall, which is an area into which the cold seawater flows from the cold seawater pit into the seawater supply pit, constitutes the circulation line; by increasing or decreasing the flow rate of the seawater flowing into the seawater supply pit, the flow rate of cold seawater resupplied from the cold seawater pit via the seawater supply pit to the open rack vaporizer is increased or decreased, thereby adjusting the temperature of the cold seawater.

2. A fuel vaporization system for vaporizing liquefied fuel, comprising: an open rack vaporizer that vaporizes the liquefied fuel by flowing seawater along outer surfaces of a plurality of heat transfer tubes to which the liquefied fuel is supplied; a seawater supply line for supplying seawater, after being used as a refrigerant in a condenser for cooling steam discharged from a steam turbine for driving a generator, to the open rack evaporator; a cold seawater supply line that supplies the cold seawater used for vaporizing the liquefied fuel in the open rack vaporizer and whose temperature has been reduced by heat exchange with the liquefied fuel to a cold energy utilization facility that utilizes the cold energy of the cold seawater; a circulation line for re-supplying a portion of the cold seawater discharged from the open rack vaporizer to the open rack vaporizer to reduce the temperature of the cold seawater to a preset temperature; A fuel vaporization facility characterized by comprising an uncooled seawater supply line that supplies seawater used as a refrigerant in the condenser and not cooled in the open rack vaporizer to the cold energy utilization facility.

3. The fuel vaporization equipment according to claim 1 or 2, characterized in that the cold energy utilization equipment is an aquaculture tank that uses the cold energy of the cold seawater to regulate the temperature of water for cultivating seafood, or a plant factory that uses the cold energy to regulate the temperature of at least one of the plant growth atmosphere, growth soil, or culture water.

4. 3. The fuel vaporization system according to claim 1, wherein the liquefied fuel is liquefied natural gas or liquefied hydrogen.

5. The fuel vaporization equipment described in claim 2, characterized in that the open rack vaporizer has a receiving tank section that receives the seawater after it has flowed along the outer surface of the heat transfer tube, the cold seawater supply line supplies the cold seawater in the receiving tank section to the cold heat utilization equipment, and the circulation line re-supplies the cold seawater in the receiving tank section to the open rack vaporizer.

6. 3. The fuel vaporization system according to claim 1, wherein the steam turbine is driven by steam generated in a waste heat boiler of a gas turbine that drives a generator.

7. 7. The fuel vaporization facility according to claim 6, further comprising a fuel gas supply line for supplying the gas vaporized in the open rack vaporizer to the gas turbine.

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