Ammonia regasification system and vessel comprising same

Abstract

An ammonia regasification system and a vessel comprising same, according to one embodiment of the present invention, comprises: a heating unit for heating ammonia of an ammonia storage tank and supplying same to a demand source; a reliquefaction unit for reliquefying ammonia boil-off gas of the ammonia storage tank; and a boil-off gas transfer unit for transferring, to the heating unit, at least a portion of the ammonia boil-off gas compressed during reliquefaction in the reliquefaction unit.

Description

Ammonia regasification system and vessel containing same

[0001] The present invention relates to an ammonia regasification system and a vessel including the same.

[0002] As global warming and environmental pollution worsen, the use of low-carbon or decarbonized fuels is increasing. Among these, ammonia, which does not contain carbon, is increasingly being used as a next-generation, eco-friendly fuel. As ammonia use increases, its transportation using ammonia carriers is also increasing.

[0003] Ammonia carriers transport ammonia and unload it at onshore terminals. However, unlike conventional liquefied natural gas (LNG) unloading, technology for regasifying ammonia for unloading has not yet been developed. Consequently, ammonia is unloaded in liquid form at onshore terminals and regasified onshore. This process, however, is inefficient.

[0004] Therefore, there is an urgent need to develop an ammonia regasification system that can efficiently unload ammonia.

[0005] The present invention was created to solve the problems of the prior art as described above, and the purpose of the present invention is to provide an ammonia regasification system that regasifies ammonia and supplies it to a demander.

[0006] The tasks of the present invention are not limited to the tasks mentioned above, and other tasks not mentioned can be clearly understood by a person of ordinary skill in the art from the description below.

[0007] An ammonia regasification system according to one aspect of the present invention comprises: a heating unit for heating ammonia in an ammonia storage tank and supplying the heated ammonia to a demander; a re-liquefaction unit for re-liquefying ammonia evaporation gas in the ammonia storage tank; and a evaporation gas delivery unit for delivering at least a portion of the compressed ammonia evaporation gas during the re-liquefaction process of the re-liquefaction unit to the heating unit.

[0008] Specifically, the above-mentioned evaporation gas delivery unit can deliver the ammonia evaporation gas of the re-liquefaction unit to the heating unit at multiple pressures.

[0009] Specifically, the above-mentioned evaporation gas delivery unit can control the pressure of the ammonia evaporation gas according to the pressure required by the demander and deliver the ammonia evaporation gas to the heating unit.

[0010] Specifically, the above-mentioned evaporation gas delivery unit can deliver ammonia evaporation gas compressed in any one of the multi-stage compressors of the above-mentioned re-liquefaction unit to the above-mentioned heating unit.

[0011] Specifically, the re-liquefaction unit may include a compressor that compresses ammonia vaporization gas, and the compressor may include a first compressor that pressurizes ammonia vaporization gas of the ammonia storage tank; a second compressor that pressurizes ammonia vaporization gas pressurized by the first compressor; and a third compressor that pressurizes ammonia vaporization gas pressurized by the second compressor.

[0012] Specifically, the vaporization gas delivery unit can deliver ammonia vaporization gas downstream of the first compressor to the heating unit, deliver ammonia vaporization gas downstream of the second compressor to the heating unit, or deliver ammonia vaporization gas downstream of the third compressor to the heating unit.

[0013] Specifically, the above-mentioned evaporation gas delivery unit is provided in the above-mentioned heating unit and can deliver ammonia evaporation gas upstream of a heat exchanger that heats ammonia.

[0014] An ammonia regasification system according to one aspect of the present invention comprises: a heating unit for heating ammonia in an ammonia storage tank and supplying the heated ammonia to a demander; and a re-liquefaction unit for re-liquefying ammonia vaporization gas in the ammonia storage tank; wherein the heating unit comprises a first heat exchanger for heat-exchanging ammonia vaporization gas, a first heat source, and ammonia.

[0015] Specifically, it may include a vaporization gas transfer unit that transfers at least a portion of the compressed ammonia vaporization gas to the heating unit during the re-liquefaction process of the re-liquefaction unit.

[0016] Specifically, the above-mentioned evaporation gas delivery unit can deliver ammonia evaporation gas compressed in any one of the multi-stage compressors of the above-mentioned re-liquefaction unit to the above-mentioned heating unit.

[0017] Specifically, the above-mentioned evaporation gas delivery unit can control the pressure of the ammonia evaporation gas according to the pressure required by the demander and deliver the ammonia evaporation gas to the heating unit.

[0018] Specifically, the above-mentioned evaporation gas transfer unit is provided downstream of the first heat exchanger and can transfer the ammonia evaporation gas upstream of the second heat exchanger that heats the ammonia as a second heat source.

[0019] Specifically, the re-liquefaction unit includes a compressor that compresses ammonia vaporization gas, and the ammonia vaporization gas pressurized by the compressor can be transferred to the first heat exchanger or transferred to the second heat exchanger.

[0020] Specifically, the first heat exchanger can exchange heat between ammonia vapor gas pressurized in the reliquefaction unit and ammonia in the ammonia storage tank.

[0021] A vessel according to one aspect of the present invention may include the ammonia regasification system.

[0022] An ammonia regasification system according to one aspect of the present invention is a system that regasifies and unloads ammonia, and can stably maintain the pressure of an ammonia storage tank by linking the reliquefaction of ammonia evaporation gas discharged from an ammonia storage tank and the unloading of ammonia.

[0023] The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

[0024] FIG. 1 is a drawing for explaining an ammonia regasification system according to a first embodiment of the present invention.

[0025] FIG. 2 is a drawing for explaining an ammonia regasification system according to a second embodiment of the present invention.

[0026] FIG. 3 is a drawing for explaining an ammonia regasification system according to a third embodiment of the present invention.

[0027] FIG. 4 is a drawing for explaining an ammonia regasification system according to a fourth embodiment of the present invention.

[0028] FIG. 5 is a drawing for explaining an ammonia regasification system according to a fifth embodiment of the present invention.

[0029] FIG. 6 is a drawing for explaining an ammonia regasification system according to the sixth embodiment of the present invention.

[0030] FIG. 7 is a drawing for explaining an ammonia regasification system according to the seventh embodiment of the present invention.

[0031] FIG. 8 is a drawing for explaining an ammonia regasification system according to the eighth embodiment of the present invention.

[0032] FIG. 9 is a drawing for explaining an ammonia regasification system according to the ninth embodiment of the present invention.

[0033] FIG. 10 is a drawing for explaining an ammonia regasification system according to the tenth embodiment of the present invention.

[0034] The purpose, specific advantages, and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments, taken in conjunction with the accompanying drawings. In this specification, when reference numerals are assigned to components in each drawing, it should be noted that, where possible, identical components are assigned the same reference numerals even if they appear in different drawings. Furthermore, in describing the present invention, if a detailed description of a related known technology is deemed to unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted.

[0035] In addition, the attached drawings are only intended to facilitate easy understanding of the embodiments disclosed in this specification, and the technical ideas disclosed in this specification are not limited by the attached drawings, and should be understood to include all modifications, equivalents, or substitutes included in the spirit and technical scope of the present invention.

[0036] Additionally, terms including ordinal numbers, such as first, second, etc., may be used to describe various components, but the components are not limited by the terms. The terms are used only to distinguish one component from another.

[0037] Furthermore, in this specification, the term "vessel" can refer to any type of vessel. It should be noted that the term "vessel" encompasses not only merchant vessels transporting cargo from their point of origin to their destination, but also offshore structures floating at a specific point in the sea to perform specific tasks. For example, the term "vessel" can refer to a facility that regasifies and unloads ammonia.

[0038] In addition, the ship may be a ship with self-propulsion capability, such as an LPG carrier, an LNG carrier, a liquid hydrogen carrier, a liquid hydrogen carrier, an ammonia carrier, a container carrier, a crude oil carrier, a bulk carrier for minerals or grains, a Ro-Ro (Roll on / Roll off) ship, etc., but the present invention is not limited thereto.

[0039] The terms "gas," "gaseous," or "evaporative gas" can be used to encompass all liquid states, as well as gaseous states that have been naturally or forcibly vaporized. Furthermore, "ammonia" can be used to encompass both liquid ammonia and gaseous ammonia. When "ammonia" and "ammonia vapor" are used together in this specification, "ammonia" can refer to liquid ammonia.

[0040] In this specification, upstream or downstream may be defined based on the direction of fluid flow in any line. Upstream may indicate the direction of the fluid's origin, and downstream may indicate the direction of the fluid's arrival.

[0041] Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the attached drawings.

[0042]

[0043] FIG. 1 is a drawing for explaining an ammonia regasification system according to a first embodiment of the present invention.

[0044] Referring to FIG. 1, an ammonia regasification system (1) according to a first embodiment of the present invention may include a heating unit (200) that heats ammonia in an ammonia storage tank (100) and supplies it to a demander.

[0045] Ammonia can be supplied to demand at a relatively low pressure compared to liquefied natural gas. Accordingly, ammonia can be supplied to demand by regasifying liquid ammonia, and evaporated gas generated in an ammonia storage tank (100) can be supplied to demand.

[0046] The ammonia storage tank (100) stores ammonia to be supplied to a demander. The ammonia storage tank (100) can store ammonia in a liquid state. At this time, the ammonia storage tank (100) may be a pressure tank, and may be of a membrane type, an independent type, a pressure vessel type, etc. However, the present invention is not limited by the shape, type, etc. of the ammonia storage tank (100).

[0047] A transfer pump (110) may be installed on an ammonia supply line (L1). The transfer pump (110) may be installed inside or outside an ammonia storage tank (100) to supply ammonia stored in the ammonia storage tank (100) to a demander. At this time, the transfer pump (110) may be a submersible pump installed inside the ammonia storage tank (100) or a centrifugal pump installed outside the ammonia storage tank (100).

[0048] The transfer pump (110) may be designed to meet the pressure required by the demand source. For example, the transfer pump (110) may be designed to supply ammonia to the demand source by pressurizing it to a pressure higher than the maximum required pressure of the demand source.

[0049] The heating unit (200) can heat ammonia and supply it to a demander. The heating unit (200) can heat ammonia to a temperature required by the demander. In addition, the heating unit (200) can vaporize liquid ammonia into gaseous ammonia and supply it to the demander.

[0050] The heating unit (200) may include a first heat exchanger (210) for heating ammonia with a first heat source; and a second heat exchanger (220) for heating ammonia with a second heat source. The first heat exchanger (210) may heat ammonia to vaporize it. The second heat exchanger (220) may be provided downstream of the first heat exchanger (210). The second heat exchanger (220) may heat ammonia to a temperature required by a demander downstream of the first heat exchanger (210).

[0051] The first heat exchanger (210) can heat-exchange ammonia in the ammonia supply line (L1) and the first heat of the first heat supply line (L2), and the second heat exchanger (220) can heat-exchange ammonia in the ammonia supply line (L1) and the second heat of the second heat supply line (L3). Here, the first heat may be seawater, and the second heat may be steam, but the present invention is not limited thereto.

[0052] A pressure sensor (P1) may be provided downstream of the second heat exchanger (220). The pressure sensor (P1) may measure the pressure of ammonia downstream of the second heat exchanger (220).

[0053] A first valve (V1) may be provided downstream of the second heat exchanger (220). The first valve (V1) may be controlled by the measured pressure of the pressure sensor (P1). For example, if the measured pressure of the pressure sensor (P1) is higher than the required pressure of the demander, the first valve (V1) may lower the pressure of the ammonia to a preset value or lower. In other words, the pressure sensor (P1) and the first valve (V1) may supply ammonia at a certain pressure to the demander.

[0054] The demand source can receive and consume heated ammonia from the heating unit (200). The demand source can receive and consume gaseous ammonia. The demand source may be a land terminal. In addition, the demand source may be an engine, turbine, boiler, fuel cell, burner, etc. installed on a ship, and may be a propulsion engine that propels the ship or a power generation engine to cover the internal power load of the ship, but the present invention is not limited thereto.

[0055]

[0056] FIG. 2 is a drawing for explaining an ammonia regasification system according to a second embodiment of the present invention.

[0057] Referring to FIG. 2, an ammonia regasification system (1) according to a first embodiment of the present invention may include a heating unit (200) that heats ammonia in an ammonia storage tank (100) and supplies the heated ammonia to a demander. The heating unit (200) may include a first heat exchanger (210) that heats ammonia with a first heat source; and a second heat exchanger (220) that heats ammonia with a second heat source.

[0058] A temperature sensor (T1) may be provided downstream of the second heat exchanger (220). The temperature sensor (T1) may measure the temperature of ammonia downstream of the second heat exchanger (220).

[0059] Meanwhile, the heating unit (200) may include a second fruit supply line (L3) that supplies the second fruit to the second heat exchanger (220). The second fruit supply line (L3) may include a second heat exchanger pass line (L31) through which the second fruit passes through the second heat exchanger (220) and a second heat exchanger bypass line (L32) through which the second heat exchanger (220) is bypassed.

[0060] A second valve (V2) may be provided in the second heat exchanger bypass line (L32). The second valve (V2) may be controlled by the measured temperature of the temperature sensor (T1). For example, if the measured temperature of the temperature sensor (T1) is higher than the required temperature of the demander, the second valve (V2) may lower the temperature of the ammonia below a preset value. In other words, the temperature sensor (T1) and the second valve (V2) may supply ammonia at a constant temperature to the demander.

[0061]

[0062] The heating unit (200) may include a third heat exchanger (240) that exchanges heat between the first heat product supplied to the first heat exchanger (210) and the second heat product discharged from the second heat exchanger (220). The second heat product can increase the temperature of ammonia in the second heat exchanger (220) and use the remaining residual heat to increase the temperature of the first heat product in the third heat exchanger (240).

[0063] The first fruit supply pump (230) can supply the first fruit to the third heat exchanger (240). At this time, the first fruit can pass through the third heat exchanger (240) and be supplied to the first heat exchanger (210). The first fruit can be discharged to the outside of the ship after heat exchange in the first heat exchanger (210), but the present invention is not limited thereto.

[0064] A first fruit temperature sensor (T2) may be provided downstream of the first heat exchanger (210) on the first fruit supply line (L2).

[0065] The second fruit supply line (L3) may include a second heat exchanger pass line (L31) through which the second fruit passes through the third heat exchanger (220) and a third heat exchanger bypass line (L33) through which the third heat exchanger (240) is bypassed. A third valve (V3) may be provided in the third heat exchanger bypass line (L33).

[0066] The second fruit may be supplied to the second heat exchanger (220) in a steam state along the second heat exchanger passage line (L31) and may be recovered after passing through the third heat exchanger (240). The second fruit may be condensed after passing through the third heat exchanger (240). The second fruit may be recovered to a second fruit storage unit (not shown) after passing through the third heat exchanger (240). The second fruit storage unit may be a boiler, but the present invention is not limited thereto.

[0067] The first fruit supply line (L2) may include a first heat exchanger pass line (L21) through which the first fruit passes through the third heat exchanger (220) and a first fruit branch line (L22) branching from the first heat exchanger pass line (L21) upstream of the third heat exchanger (240). A fourth valve (V4) may be provided in the first fruit branch line (L22). The first fruit may be discharged to the outside of the vessel along the first fruit branch line (L22), but the present invention is not limited thereto.

[0068] At least one of the third valve (V3) and the fourth valve (V4) can be controlled by the measured temperature of the first heat source temperature sensor (T2). The third valve (V3) can adjust the amount of the second heat source bypassing the third heat exchanger (240) according to the measured temperature of the first heat source temperature sensor (T2). For example, the third valve (V3) can reduce the amount of the second heat source delivered to the third heat exchanger (240) when the measured temperature of the first heat source temperature sensor (T2) is higher than a preset value. That is, the second heat source can bypass the third heat exchanger (240) along the third valve (V3).

[0069] In addition, the fourth valve (V4) can control the amount of the first fruit delivered to the third heat exchanger (240) according to the measured temperature of the first fruit temperature sensor (T2). If the measured temperature of the first fruit temperature sensor (T2) is higher than a preset value, the fourth valve (V4) can increase the amount of the first fruit delivered to the third heat exchanger (240). That is, the fourth valve (V4) can be opened to reduce the amount of the first fruit delivered to the first fruit branch line (L22). Therefore, the external discharge temperature of the first fruit can be lowered.

[0070] The fourth valve (V4) can be used as a backup for the third valve (V3). For example, if the third valve (V3) malfunctions or the amount of the second heat source supplied through the second heat source supply line (L3) cannot be controlled, the fourth valve (V4) can be used as a backup. That is, the temperature of the first heat source is generally controlled by controlling the amount of the second heat source through the third valve (V3), and if the temperature of the first heat source cannot be controlled by the amount of the second heat source, the fourth valve (V4) can be used. For example, if the amount of the second heat source is not controlled and a large amount flows into the third heat exchanger (240), the fourth valve (V4) can be opened to increase the amount of the first heat source delivered to the third heat exchanger (240). However, the present invention is not limited thereto.

[0071] In this way, the ammonia regasification system (1) according to the second embodiment of the present invention allows the heat of the second heat product to be sufficiently utilized in the second heat exchanger (220) and the third heat exchanger (240), and the second heat product is recovered to the second heat product storage unit along the waste heat path so that the heat of the second heat product can be reused for heating ammonia or the first heat product. In addition, the temperature of ammonia required by the consumer can be satisfied through the first heat exchanger (210) and the second heat exchanger (220).

[0072] Furthermore, even when the supply of the second fruit is not controlled, the temperature of the first fruit can be controlled by adjusting the flow rate of the first fruit. Therefore, the external discharge temperature of the first fruit can be prevented from becoming excessively high compared to the seawater temperature.

[0073]

[0074] FIG. 3 is a drawing for explaining an ammonia regasification system according to a third embodiment of the present invention.

[0075] Referring to FIG. 3, it may include a heating unit (200) that heats ammonia in an ammonia storage tank (100) and supplies it to a demander; and a re-liquefaction unit (300) that re-liquefies ammonia evaporation gas in the ammonia storage tank (100).

[0076] The re-liquefaction unit (300) can re-liquefy the ammonia boil-off gas according to the pressure of the ammonia storage tank (100). For example, the re-liquefaction unit (300) can re-liquefy the ammonia boil-off gas when the pressure of the ammonia storage tank (100) is higher than a preset value. The pressure of the ammonia storage tank (100) can be measured by the storage tank pressure sensor (P2). The ammonia boil-off gas can be liquefied and returned to the ammonia storage tank (100) while passing through the re-liquefaction unit (300) along the boil-off gas supply line (L4).

[0077] In detail, the re-liquefaction unit (300) may include a gas-liquid separator (310) that receives ammonia evaporation gas from the ammonia storage tank (100) and separates it into liquid ammonia and gaseous ammonia. The gas-liquid separator (310) separates the ammonia evaporation gas of the ammonia storage tank (100) into gas-liquid and supplies only gaseous ammonia to the compressor (320), thereby preventing damage to the compressor (320).

[0078] The above re-liquefaction unit (300) may include a compressor (320) that compresses ammonia evaporation gas; a condenser (340) that condenses the ammonia evaporation gas compressed in the compressor (320); and an intercooler (330) that controls the temperature of the ammonia evaporation gas compressed in the compressor (320) with the ammonia condensed in the condenser (340).

[0079] Ammonia vaporization gas of an ammonia storage tank (100) can be supplied to a gas-liquid separator (310) along an vaporization gas supply line (L4). Liquid ammonia separated in the gas-liquid separator (310) can be recovered to the ammonia storage tank (100). Gaseous ammonia separated in the gas-liquid separator (310) can be delivered to a compressor (320) disposed downstream of the gas-liquid separator (310). Gaseous ammonia of the gas-liquid separator (310) can be delivered to the compressor (320) by the suction force of the compressor (320) disposed downstream of the gas-liquid separator (310).

[0080] The compressor (320) can compress the ammonia evaporation gas and deliver it to the condenser (340). The compressor (320) can include multiple compression stages. The compressor (320) can be a multi-stage compressor and can compress the ammonia evaporation gas in multiple stages. The compressor (320) can have multiple compression stages arranged in series. For example, the compressor (320) can be configured with three stages. In addition, the compressors (320) can be arranged in parallel for backup or load sharing.

[0081] The compressor (320) can compress the evaporation gas introduced at about 1 bar to 10 to 100 bar, and when the evaporation gas is compressed by the compressor (320), the boiling point of the evaporation gas increases. Therefore, the compressed evaporation gas can be liquefied even without being cooled to the boiling point at atmospheric pressure.

[0082] The compressor (320) may include a first compressor (321) for pressurizing ammonia vaporization gas of the ammonia storage tank (100); a second compressor (322) for pressurizing ammonia vaporization gas pressurized in the first compressor (321); and a third compressor (323) for pressurizing ammonia vaporization gas pressurized in the second compressor (322).

[0083] The intercooler (330) can control the temperature of the ammonia evaporation gas compressed in the compressor (320) with the ammonia condensed in the condenser (340).

[0084] The re-liquefaction unit (300) may include a pressure reducing valve (V5, V6) provided upstream of the intercooler (330). The intercooler (330) may allow some of the ammonia condensed in the condenser (340) to pass through the pressure reducing valve (V5, V6) and store it inside, and allow the remainder of the ammonia condensed in the condenser (340) to pass through the inside, thereby allowing the ammonia to exchange heat with each other.

[0085] The intercooler (330) may be provided with an evaporation gas inlet (not shown) for introducing ammonia evaporation gas compressed by the compressor (320) into the interior. The evaporation gas inlet may be provided at a position higher than the level of liquid ammonia stored inside the intercooler (330). This is to prevent unnecessary evaporation of liquid ammonia.

[0086] Additionally, the intercooler (330) may be provided with a decompression gas inlet (not shown) through which ammonia condensed in the condenser (340) flows into the interior. The decompression gas inlet may be provided at a position higher than the level of liquid ammonia stored inside the intercooler (330). The decompression gas flowing in through the decompression gas inlet and the compressed gas flowing in through the evaporation gas inlet undergo heat exchange, and the compressed gas may be cooled.

[0087] An intercooler (330) may be provided downstream of a condenser (340) on an evaporation gas supply line (L4). A plurality of intercoolers (330) may be provided. The intercooler (330) may include a first intercooler (331) provided between a first compressor (321) and a second compressor (322) on an evaporation gas supply line (L4); and a second intercooler (332) provided downstream of a condenser (340) on an evaporation gas supply line (L4).

[0088] The second intercooler (332) may be connected to an evaporation gas branch line (L41b) that branches off from the evaporation gas liquefaction line (L41a) upstream of the intercooler (330) on the evaporation gas supply line (L4, L41) and is provided with a pressure reducing valve (V5). In addition, the evaporation gas liquefaction line (L41a) passes through the interior of the second intercooler (332), and ammonia condensed in the condenser (340) may pass through the second intercooler (332) along the evaporation gas liquefaction line (L41a) and be delivered to the first intercooler (331).

[0089] The intercooler (330) is filled with ammonia depressurized by the pressure reducing valve (V5, V6) through the evaporation gas branch line (L41b), and the condensed ammonia can pass through the inside of the intercooler (330) along the evaporation gas liquefaction line (L41a).

[0090] The pressure reducing valve (V5) provided in the evaporation gas branch line (L41b) reduces the pressure of ammonia branched off from the upstream of the second intercooler (332) after being cooled by the condenser (340). The pressure reducing valve (V5) cools ammonia by reducing its pressure (Joule-Thomson effect) as a Joule-Thomson valve or an expander, etc., so the pressure reducing valve (V5) can further cool the ammonia cooled by the condenser (340) to liquefy or supercool the evaporation gas.

[0091] Ammonia cooled in the second intercooler (332) can be supplied upstream or downstream of the second compressor (322). The cooled ammonia may be non-condensed gaseous ammonia.

[0092] The second intercooler (332) may be connected to a first evaporation gas branch line (L41b1) connected upstream of the second compressor (322) and a second evaporation gas branch line (L41b2) connected downstream of the second compressor (322). Ammonia cooled in the second intercooler (332) may cool ammonia evaporation gas compressed in the second compressor (322).

[0093] A part of the ammonia evaporation gas cooled by the second intercooler (332) may be delivered upstream of the second compressor (322), and the remaining part may be delivered downstream of the second compressor (322). The cooled ammonia evaporation gas may be delivered upstream of the second compressor (322) to cool the ammonia evaporation gas pressurized in the first compressor (321). At this time, the ammonia evaporation gas pressurized in the first compressor (321) may be cooled in the first intercooler (331). In addition, the cooled ammonia evaporation gas may be delivered downstream of the second compressor (322) to cool the ammonia evaporation gas pressurized in the second compressor (322).

[0094] The first intercooler (331) can cool the ammonia evaporation gas introduced from the first compressor (321) using depressurized ammonia as a refrigerant. Therefore, the first intercooler (331) can cool the ammonia evaporation gas between the first compressor (321) and the second compressor (322). The ammonia evaporation gas introduced from the first compressor (321) to the first intercooler (331) can be supplied to the second compressor (322).

[0095] The first intercooler (331) may be connected to a first evaporation gas liquefaction line (L41a1) and a second evaporation gas liquefaction line (L41a2) branched from the first evaporation gas liquefaction line (L41a1) upstream of the first intercooler (331) and provided with a pressure reducing valve (V6). In addition, the first evaporation gas liquefaction line (L41a1) passes through the interior of the first intercooler (331), and ammonia passing through the second intercooler (332) may pass through the first intercooler (331) along the first evaporation gas liquefaction line (L41a1) and be delivered to the ammonia storage tank (100).

[0096] The condenser (340) may be provided downstream of the compressor (320) which is provided in multiple stages. The condenser (340) may cool the ammonia evaporation gas. At this time, the condenser (340) may re-liquefy the ammonia evaporation gas. For example, the condenser (340) may cool the ammonia evaporation gas delivered from the downstream of the third compressor (321). The condenser (340) may cool the ammonia evaporation gas using various refrigerants (for example, seawater, fresh water, glycol water, nitrogen, LNG, LPG, propane, R134a, CO2, etc.) without limitation.

[0097] The ammonia vaporization gas cooled by the intercooler (330) can be recovered to the ammonia storage tank (100) together with the liquid ammonia separated by the gas-liquid separator (310). The ammonia cooled by the intercooler (330) and delivered along the first vaporization gas liquefaction line (L41a1) can be cooled by being depressurized by the pressure reducing valve (V7). The first vaporization gas liquefaction line (L41a1) can be connected to the vaporization gas recovery line (L42) of the vapor-liquid separator (310).

[0098] The re-vaporization of liquid ammonia in the ammonia storage tank (100) and its supply to the demander and the re-liquefaction of ammonia evaporation gas in the ammonia storage tank (100) may proceed simultaneously or independently, but the present invention is not limited thereto.

[0099]

[0100] FIG. 4 is a drawing for explaining an ammonia regasification system according to a fourth embodiment of the present invention.

[0101] Referring to FIG. 4, an ammonia regasification system (1) according to a fourth embodiment of the present invention may include a heating unit (200) that heats ammonia in an ammonia storage tank (100) and supplies it to a demander; a re-liquefaction unit (300) that re-liquefies ammonia evaporation gas in the ammonia storage tank (100); and a evaporation gas delivery unit (400) that delivers at least a portion of the ammonia evaporation gas compressed in the re-liquefaction process of the re-liquefaction unit (300) to the heating unit (200).

[0102] The vaporization gas delivery unit (400) can deliver ammonia vaporization gas to a demander according to the pressure of the ammonia storage tank (100). For example, the vaporization gas delivery unit (400) can supply ammonia vaporization gas to a demander when the pressure of the ammonia storage tank (100) is higher than a preset value. The pressure of the ammonia storage tank (100) can be measured by a storage tank pressure sensor (P2). The ammonia vaporization gas can be supplied to a demander through a heating unit (200).

[0103] The above-mentioned evaporation gas delivery unit (400) can deliver the ammonia evaporation gas of the re-liquefaction unit (300) to the heating unit (200) at multiple pressures. The above-mentioned evaporation gas delivery unit (400) can deliver the ammonia evaporation gas to the heating unit (200) at any one of low pressure, medium pressure, and high pressure.

[0104] The above-described evaporative gas delivery unit (400) may include a control unit (410), a first control valve (420), a second control valve (430), and a third control valve (440). The control unit (410) may receive a pressure signal from a storage tank pressure sensor (P2) and control the opening and closing of the first control valve (420), the second control valve (430), and the third control valve (440) based on the received pressure signal. For example, the control unit (410) may open at least one of the first control valve (420) provided on the first evaporative gas delivery line (L5), the second control valve (430) provided on the second evaporative gas delivery line (L6), and the third control valve (440) provided on the third evaporative gas delivery line (L7).

[0105] The control unit (410) supplies ammonia evaporation gas to a demander when the pressure of the ammonia storage tank (100) is higher than a preset value. At this time, the control unit (410) can control the opening and closing of the first control valve (420), the second control valve (430), and the third control valve (440). The control unit (410) can supply ammonia evaporation gas of different pressures to the demander by controlling the opening and closing of the first control valve (420), the second control valve (430), and the third control valve (440).

[0106] The above-described evaporation gas delivery unit (400) can deliver ammonia evaporation gas compressed in at least one of the multi-stage compressors of the re-liquefaction unit (300) to the heating unit (200). The evaporation gas delivery unit (400) can deliver ammonia evaporation gas downstream of the first compressor (321) to the heating unit (200) (low-pressure mode). The evaporation gas delivery unit (400) can deliver ammonia evaporation gas downstream of the second compressor (322) to the heating unit (200) (medium-pressure mode). The evaporation gas delivery unit (400) can deliver ammonia evaporation gas downstream of the third compressor (323) to the heating unit (200) (high-pressure mode).

[0107] In detail, the evaporation gas delivery unit (400) can deliver ammonia evaporation gas downstream of the first compressor (321) to the heating unit (200) by opening the first control valve (420) (low pressure mode). In addition, the evaporation gas delivery unit (400) can deliver ammonia evaporation gas downstream of the second compressor (322) to the heating unit (200) by opening the second control valve (430) (medium pressure mode). The evaporation gas delivery unit (400) can deliver ammonia evaporation gas downstream of the third compressor (323) to the heating unit (200) by opening the third control valve (440) (high pressure mode).

[0108] The above-described evaporation gas delivery unit (400) can supply ammonia evaporation gas to the heating unit (200) or the demander at different pressures depending on the demand pressure of the demander. For example, the evaporation gas delivery unit (400) can deliver ammonia evaporation gas downstream of the first compressor (321) to the heating unit (200) when the demand pressure of the demander is low pressure. The evaporation gas delivery unit (400) can deliver ammonia evaporation gas downstream of the second compressor (322) to the heating unit (200) when the demand pressure of the demander is between low pressure and high pressure. The evaporation gas delivery unit (400) can deliver ammonia evaporation gas downstream of the third compressor (323) to the heating unit (200) when the demand pressure of the demander is high pressure.

[0109] For example, the vaporization gas delivery unit (400) may deliver ammonia vaporization gas downstream of the first compressor (321) that pressurizes the ammonia vaporization gas of the ammonia storage tank (100) to the heating unit (200) when the demand pressure of the demand source is lower than the first pressure, and may deliver ammonia vaporization gas downstream of the second compressor (322) provided downstream of the first compressor (321) to the heating unit (200) when the demand pressure of the demand source is the first pressure or the second pressure, and may deliver ammonia vaporization gas downstream of the third compressor (323) provided downstream of the second compressor (322) to the heating unit (200) when the demand pressure of the demand source is higher than the second pressure.

[0110]

[0111] The control unit (410) may include display units (411, 412, 413) that indicate that the pressure of the ammonia storage tank (100) is above a preset value. For example, the display units may include a low pressure display unit (411), a medium pressure display unit (412), and a high pressure display unit (413).

[0112] When the pressure of the ammonia storage tank (100) is higher than the preset value, at least one of the low pressure display unit (411), the medium pressure display unit (412), and the high pressure display unit (413) can indicate that the pressure of the ammonia storage tank (100) is higher than the preset value. For example, at least one of the low pressure display unit (411), the medium pressure display unit (412), and the high pressure display unit (413) can be turned on.

[0113] In addition, a control signal can be input by the low pressure display unit (411), the medium pressure display unit (412), and the high pressure display unit (413). The opening and closing of the first control valve (420), the second control valve (430), and the third control valve (440) can be controlled by the control signal. For example, when a control signal is input by the low pressure display unit (411), the control unit (410) can open the first control valve (420). The operator can input a control signal through the low pressure display unit (411), the medium pressure display unit (412), and the high pressure display unit (413).

[0114] The opening and closing of the first control valve (420), the second control valve (430), and the third control valve (440) can be controlled according to the demand pressure of the demand source. For example, when the demand pressure of the demand source is lower than the first pressure, the control unit (410) can transmit an opening signal to the first control valve (420). When the demand pressure of the demand source is between the first pressure and the second pressure, the control unit (410) can transmit an opening signal to the second control valve (430). When the demand pressure of the demand source is higher than the second pressure, the control unit (410) can transmit an opening signal to the third control valve (440).

[0115] The evaporation gas delivery unit (400) can deliver ammonia evaporation gas to the heating unit (200) along the evaporation gas delivery lines (L5, L6, L7). For example, the evaporation gas delivery unit (400) can deliver ammonia evaporation gas to the upstream of the second heat exchanger (220) provided in the heating unit (200) and controlling the temperature of ammonia with a second heat medium. That is, the evaporation gas delivery unit (400) can deliver ammonia evaporation gas to the downstream of the first heat exchanger (210) provided in the heating unit (200) and heating ammonia with a first heat medium.

[0116] The second heat exchanger (220) can heat the ammonia vaporization gas delivered through the vaporization gas delivery unit (400) to a temperature required by the demander.

[0117] The supply of ammonia evaporation gas from the evaporation gas delivery unit (400) to the demand source and the re-liquefaction of ammonia evaporation gas from the ammonia storage tank (100) may proceed simultaneously or independently, but the present invention is not limited thereto.

[0118] In this way, since the ammonia evaporation gas of the ammonia storage tank (100) is supplied to the demand source by the evaporation gas delivery unit (400), the pressure of the ammonia storage tank (100) can be lowered, and at the same time, the ammonia evaporation gas can be prevented from being burned for the pressure of the ammonia storage tank (100).

[0119] In addition, since the evaporation gas delivery unit (400) shares the compressor (320) of the re-liquefaction unit (300), the cost required for installing an additional compressor can be reduced, and the space waste caused by the additional compressor can be reduced. At this time, the evaporation gas delivery unit (400) can change the pressure of the ammonia supplied to the demander by using the multi-stage compressor of the re-liquefaction unit (300).

[0120]

[0121] FIG. 5 is a drawing for explaining an ammonia regasification system according to a fifth embodiment of the present invention.

[0122] Referring to FIG. 5, an ammonia regasification system (1) according to a fifth embodiment of the present invention may include a heating unit (200) that heats ammonia in an ammonia storage tank (100) and supplies it to a demander; a re-liquefaction unit (300) that re-liquefies ammonia evaporation gas in the ammonia storage tank (100); and a evaporation gas delivery unit (400) that delivers at least a portion of the ammonia evaporation gas compressed in the re-liquefaction process of the re-liquefaction unit (300) to the heating unit (200).

[0123] The evaporation gas delivery unit (400) can deliver ammonia evaporation gas to the heating unit (200) along the evaporation gas delivery lines (L5, L6, L7). Specifically, the evaporation gas delivery unit (400) is provided in the heating unit (200) and can deliver ammonia upstream of a second heat exchanger (220) that heats ammonia with a second heat medium. The ammonia evaporation gas delivered by the evaporation gas delivery unit (400) can be heated in the second heat exchanger (220) by the second heat medium. The second heat exchanger can change the temperature of ammonia supplied to a demander.

[0124] At this time, when the first fruit is supplied to the first heat exchanger (210), the second fruit can heat the first fruit while passing through the third heat exchanger (240). However, when the first heat exchanger (210) is not in operation or the first fruit is not supplied to the first heat exchanger (210), the second fruit can bypass the third heat exchanger (240). The second fruit can pass through or bypass the third heat exchanger and be recovered to the second fruit storage unit (not shown).

[0125] At least two of the steps of re-gasifying the liquid ammonia in the ammonia storage tank (100) and supplying it to the demander, re-liquefying the ammonia evaporation gas in the ammonia storage tank (100) and supplying the ammonia evaporation gas in the evaporation gas delivery unit (400) to the demander may be performed simultaneously or independently, but the present invention is not limited thereto.

[0126] For example, when the liquid ammonia in the ammonia storage tank (100) is re-gasified and supplied to the demand source and the ammonia evaporation gas of the evaporation gas delivery unit (400) is supplied to the demand source at the same time, the evaporation gas delivery unit (400) can deliver the ammonia evaporation gas to the upstream of the second heat exchanger (220), and the ammonia evaporated in the first heat exchanger (210) can be supplied to the demand source together with the ammonia evaporation gas.

[0127] In this case, the second heat exchanger (220) mixes the ammonia vaporized in the first heat exchanger (210) with the ammonia vaporization gas delivered through the vaporization gas delivery unit (400), and can heat the mixed gas to a temperature required by the demander.

[0128] An ammonia regasification system (1) can be installed on a ship. A ship having an ammonia regasification system (1) installed thereon may be an ammonia regasification vessel (ammonia RV) or a floating ammonia storage and regasification facility in which an ammonia regasification system (1) is installed on an ammonia carrier so as to regasify ammonia at sea and supply ammonia gas to a land terminal.

[0129] FIG. 6 is a drawing for explaining an ammonia regasification system according to the sixth embodiment of the present invention.

[0130] Referring to FIG. 6, an ammonia regasification system (1) according to a sixth embodiment of the present invention includes a heating unit (200) that heats ammonia in an ammonia storage tank (100) and supplies it to a demander; and a re-liquefaction unit (300) that re-liquefies ammonia evaporation gas in the ammonia storage tank (100); and the heating unit (200) may include a first heat exchanger (210) that heat-exchanges a first heat source and ammonia.

[0131] The ammonia storage tank (100) may be connected to a transfer pump (110). The transfer pump (110) may be accommodated inside the ammonia storage tank (100), but the present invention is not limited thereto. The transfer pump (110) may be a feed pump that supplies ammonia to a demander.

[0132] The transfer pump (110) can transfer ammonia from the ammonia storage tank (100) to the heating unit (200). Specifically, the transfer pump (110) can transfer ammonia to the first heat exchanger (210).

[0133] The transfer pump (110) can pressurize ammonia and transfer it to the heating unit (200). The head of the transfer pump (110) can be designed to meet the pressure requirement of the demander. The transfer pump (110) can meet the pressure requirement of the demander with the highest pressure requirement among the demanders to which ammonia can be transferred.

[0134] The first heat exchanger (210) can exchange heat between ammonia and the first heat medium. In the first heat exchanger (210), the temperature of the ammonia can be controlled by the first heat medium. The ammonia can be heated by the first heat medium. The ammonia can be vaporized by the first heat medium. The first heat exchanger (210) can be a vaporizer. The vaporized ammonia can pass through the second heat exchanger (220) and be supplied to the demander.

[0135] The first fruit may be supplied by the first fruit supply pump (230). The first fruit may be seawater, and the first fruit supply pump (230) may be a seawater supply pump. However, the present invention is not limited thereto.

[0136] A demand source can receive and consume ammonia. Furthermore, the demand source can be a device that delivers ammonia. Furthermore, the demand source can receive and store ammonia. For example, the demand source can be a manifold or an onshore terminal.

[0137] Ammonia can be supplied to demand at a relatively lower pressure than liquefied natural gas. In other words, demand may require a lower pressure than demand for liquefied natural gas. However, the present invention is not limited by the demand.

[0138] The second heat exchanger (220) can exchange heat between ammonia and the second heat product. In the second heat exchanger (210), the temperature of the ammonia can be controlled by the second heat product. The second heat exchanger (220) can control the temperature of the ammonia to the temperature required by the consumer.

[0139] The second fruit may be steam, and the steam may be condensed and discharged in a condensed state while passing through the second heat exchanger (220). The second fruit supply line (L3) may be connected to a boiler. The boiler supplies steam to the second heat exchanger (220) along the second fruit supply line (L3), and the condensed steam may be returned to the boiler.

[0140] The temperature of ammonia measured by the temperature sensor (T1) can be controlled by the flow rate of steam supplied from the boiler, the temperature of the steam, or the flow rate of steam bypassing the second heat exchanger (220). The temperature sensor (T1) can transmit an opening signal or a closing signal to the second valve (V2). Accordingly, the flow rate of steam bypassing the second heat exchanger (220) can be controlled. The temperature sensor (T1) can transmit an opening signal or a closing signal to the second valve (V2) until the temperature of the ammonia is controlled to a preset temperature.

[0141] The first fruit can be supplied through the first fruit supply line (L2). The first heat exchanger bypass line (L21) can be connected to the first heat exchanger (210). The first fruit supply line (L2) can be branched into a first heat exchanger bypass line (L23) that bypasses the first heat exchanger (210).

[0142] The first fruit may bypass the first heat exchanger bypass line (L23) depending on the temperature of the ammonia passing through the first heat exchanger (210). Specifically, the temperature of the ammonia passing through the first heat exchanger (210) may be measured by the heating unit temperature sensor (T3). The heating unit temperature sensor (T3) may be provided downstream of the first heat exchanger (210) on the ammonia supply line (L1).

[0143] A bypass line valve (V8) may be provided on the first heat exchanger bypass line (L23). The bypass line valve (V8) may be opened and closed according to the temperature measured by the heating unit temperature sensor (T3). For example, if the temperature of ammonia downstream of the first heat exchanger (210) is high, the bypass line valve (V8) may be closed.

[0144] All or part of the ammonia may be delivered to the first heat exchanger (210), and the remaining part may be delivered to the first heat exchanger bypass line (L23). At this time, the opening of the bypass line valve (V8) may be adjusted, so that the flow rate of the first heat medium supplied to the first heat exchanger (210) by the bypass line valve (V8) may be controlled.

[0145] The opening and closing of the bypass line valve (V8) can be controlled until the temperature of the ammonia measured by the heating unit temperature sensor (T3) is adjusted to a preset temperature. The heating unit temperature sensor (T3) can transmit a signal to the bypass line valve (V8). For example, the heating unit temperature sensor (T3) can transmit an open signal or a close signal to the bypass line valve (V8) until the temperature of the ammonia is adjusted to a preset temperature.

[0146] The above preset temperature may be stored in the heating unit temperature sensor (T3). The preset temperature may be set in consideration of the temperature required by the user. The preset temperature may be the temperature of ammonia downstream of the first heat exchanger (210) that can satisfy the temperature required by the user.

[0147] Additionally, the flow rate of the first fruit supplied by the first fruit supply pump (230) can be controlled based on the temperature of the ammonia measured by the heating unit temperature sensor (T3). The heating unit temperature sensor (T3) can transmit a signal to the first fruit supply pump (230).

[0148] A pressure sensor (P1) may be provided downstream of the second heat exchanger (220). The pressure sensor (P1) may measure the pressure of ammonia downstream of the second heat exchanger (220). A first valve (V1) may be provided downstream of the second heat exchanger (220). The first valve (V1) may be controlled by the measured pressure of the pressure sensor (P1). For example, if the measured pressure of the pressure sensor (P1) is higher than the required pressure of the demander, the first valve (V1) may lower the pressure of the ammonia to a preset value or lower. Conversely, if the measured pressure of the pressure sensor (P1) is lower than the required pressure of the demander, the first valve (V1) may increase the pressure of the ammonia to a preset value or higher. That is, the pressure sensor (P1) and the first valve (V1) can supply ammonia at a certain pressure to the demand source.

[0149]

[0150] FIG. 7 is a drawing for explaining an ammonia regasification system according to the seventh embodiment of the present invention.

[0151] Referring to FIG. 7, an ammonia regasification system (1) according to a seventh embodiment of the present invention includes a heating unit (200) that heats ammonia in an ammonia storage tank (100) and supplies it to a demander; and a re-liquefaction unit (300) that re-liquefies ammonia vaporization gas in the ammonia storage tank (100); and the heating unit (200) may include a first heat exchanger (210) that heat-exchanges ammonia vaporization gas and a first heat source.

[0152] The re-liquefaction unit (300) can re-liquefy the ammonia boil-off gas according to the pressure of the ammonia storage tank (100). For example, the re-liquefaction unit (300) can re-liquefy the ammonia boil-off gas when the pressure of the ammonia storage tank (100) is higher than a preset value. The pressure of the ammonia storage tank (100) can be measured by the storage tank pressure sensor (P2). The ammonia boil-off gas can be liquefied and returned to the ammonia storage tank (100) while passing through the re-liquefaction unit (300) along the boil-off gas supply line (L4).

[0153] In detail, the re-liquefaction unit (300) may include a gas-liquid separator (310) that receives ammonia evaporation gas from the ammonia storage tank (100) and separates it into liquid ammonia and gaseous ammonia. The gas-liquid separator (310) separates the ammonia evaporation gas of the ammonia storage tank (100) into gas and liquid, thereby supplying only gaseous ammonia to the compressor (320), thereby preventing damage to the compressor (320). The liquid ammonia can be recovered to the ammonia storage tank (100).

[0154] The re-liquefaction unit (300) includes a compressor (320) that compresses ammonia evaporation gas, and the first heat exchanger (210) can condense the ammonia evaporation gas compressed in the compressor (320). In addition, the re-liquefaction unit (300) can include an intercooler (330) that adjusts the temperature of the ammonia evaporation gas compressed in the compressor (320) with the ammonia condensed in the first heat exchanger (210).

[0155] The compressor (320) can compress the ammonia evaporation gas and deliver it to the first heat exchanger (210). The compressor (320) can include multiple compression stages. The compressor (320) can be a multi-stage compressor and can compress the ammonia evaporation gas in multiple stages. The compressor (320) can have multiple compression stages arranged in series. For example, the compressor (320) can be configured with three stages. In addition, the compressors (320) can be arranged in parallel for backup or load sharing.

[0156] The compressor (320) can compress the evaporation gas introduced at about 1 bar to 10 to 100 bar, and when the evaporation gas is compressed by the compressor (320), the boiling point of the evaporation gas increases. Therefore, the compressed evaporation gas can be liquefied even without being cooled to the boiling point at atmospheric pressure.

[0157] The compressor (320) may include a first compressor (321) for pressurizing ammonia vaporization gas of the ammonia storage tank (100); a second compressor (322) for pressurizing ammonia vaporization gas pressurized in the first compressor (321); and a third compressor (323) for pressurizing ammonia vaporization gas pressurized in the second compressor (322).

[0158] The first heat exchanger (210) can exchange heat between the ammonia evaporation gas compressed by the compressor (320) and the first heat medium. The first heat exchanger (210) can condense the ammonia evaporation gas. The flow rate of the first heat medium supplied to the first heat exchanger (210) can be controlled by the first heat exchanger bypass line (L23) and the bypass line valve (V8).

[0159] The first fruit may bypass the first heat exchanger bypass line (L23) depending on the temperature of the ammonia passing through the first heat exchanger (210). Here, the ammonia may be transferred from the compressor (320) to the intercooler (330). The temperature of the ammonia passing through the first heat exchanger (210) may be measured by the reliquefaction unit temperature sensor (T4). The reliquefaction unit temperature sensor (T4) may be provided downstream of the first heat exchanger (210).

[0160] The above bypass line valve (V8) can be opened and closed according to the temperature measured by the reliquefaction unit temperature sensor (T4). For example, if the temperature of ammonia downstream of the first heat exchanger (210) is high, the bypass line valve (V8) can be closed.

[0161] All or part of the ammonia may be delivered to the first heat exchanger (210), and the remaining part may be delivered to the first heat exchanger bypass line (L23). The flow rate of the first heat medium supplied to the first heat exchanger (210) may be controlled by the bypass line valve (V8).

[0162] The opening and closing of the bypass line valve (V8) can be controlled until the temperature of the ammonia measured by the reliquefaction unit temperature sensor (T4) is adjusted to a preset temperature. The reliquefaction unit temperature sensor (T4) can transmit a signal to the bypass line valve (V8). For example, the reliquefaction unit temperature sensor (T4) can transmit an open signal or a close signal to the bypass line valve (V8) until the temperature of the ammonia is adjusted to a preset temperature.

[0163] The intercooler (330) can control the temperature of the ammonia evaporation gas compressed in the compressor (320) with the ammonia condensed in the first heat exchanger (210). Specifically, the re-liquefaction unit (300) can include a pressure reducing valve (V5, V6) provided upstream of the intercooler (330). The intercooler (330) can allow some of the ammonia condensed in the first heat exchanger (210) to pass through the pressure reducing valve (V5, V6) and store it inside, and allow the remainder of the ammonia condensed in the first heat exchanger (210) to pass through the inside, thereby mutually exchanging heat between the ammonia.

[0164] The intercooler (330) may be provided with an evaporation gas inlet (not shown) for introducing ammonia evaporation gas compressed by the compressor (320) into the interior. The evaporation gas inlet may be provided at a position higher than the level of liquid ammonia stored inside the intercooler (330). This is to prevent unnecessary evaporation of the liquid ammonia. The evaporation gas inlet may be provided at the upper portion of the first intercooler (331).

[0165] In addition, the intercooler (330) may be provided with a decompression gas inlet (not shown) through which ammonia condensed in the first heat exchanger (210) flows into the interior. The decompression gas inlet may be provided at a position higher than the level of liquid ammonia stored inside the intercooler (330). The decompression gas introduced through the decompression gas inlet and the compressed gas introduced through the evaporation gas inlet may undergo heat exchange, and the compressed gas may be cooled. The decompression gas inlet may be provided at the upper portions of the first intercooler (331) and the second intercooler (332).

[0166] An intercooler (330) may be provided downstream of the first heat exchanger (210) on the evaporation gas supply line (L4). A plurality of intercoolers (330) may be provided. The intercooler (330) may include a first intercooler (331) provided between the first compressor (321) and the second compressor (322) on the evaporation gas supply line (L4); and a second intercooler (332) provided downstream of the first heat exchanger (210) on the evaporation gas supply line (L4).

[0167] The second intercooler (332) may be connected to an evaporation gas branch line (L41b) that branches off from the evaporation gas liquefaction line (L41a) upstream of the intercooler (330) on the evaporation gas supply line (L4, L41) and is provided with a pressure reducing valve (V5). In addition, the evaporation gas liquefaction line (L41a) passes through the interior of the second intercooler (332), and ammonia condensed in the first heat exchanger (210) may pass through the second intercooler (332) along the evaporation gas liquefaction line (L41a) and be delivered to the first intercooler (331).

[0168] The second intercooler (332) is filled with ammonia depressurized by the pressure reducing valve (V5) through the evaporation gas branch line (L41b), and the ammonia condensed in the first heat exchanger (210) can pass through the inside of the second intercooler (332) along the evaporation gas liquefaction line (L41a). Heat exchange can occur between the ammonia depressurized by the pressure reducing valve (V5) and the ammonia flowing in the evaporation gas liquefaction line (L41a).

[0169] The pressure reducing valve (V5) provided in the evaporation gas branch line (L41b) reduces the pressure of ammonia branched off from the upstream of the second intercooler (332) after being cooled by the first heat exchanger (210). The pressure reducing valve (V5) cools ammonia by reducing its pressure (Joule-Thomson effect) as a Joule-Thomson valve or an expander, etc., so the pressure reducing valve (V5) can further cool the ammonia cooled by the first heat exchanger (210) to liquefy or supercool the evaporation gas.

[0170] Ammonia cooled in the second intercooler (332) can be supplied upstream or downstream of the second compressor (322). The cooled ammonia supplied to the second compressor (322) may be non-condensed gaseous ammonia.

[0171] The second intercooler (332) may be connected to a first evaporation gas branch line (L41b1) connected upstream of the second compressor (322) and a second evaporation gas branch line (L41b2) connected downstream of the second compressor (322). Some of the ammonia evaporation gas cooled by the second intercooler (332) may be delivered upstream of the second compressor (322), and the remaining part may be delivered downstream of the second compressor (322). The cooled ammonia evaporation gas may be delivered upstream of the second compressor (322) to cool the ammonia evaporation gas pressurized in the first compressor (321). At this time, the ammonia evaporation gas pressurized in the first compressor (321) may be cooled in the first intercooler (331). Additionally, the cooled ammonia evaporation gas can be delivered downstream of the second compressor (322) to cool the ammonia evaporation gas pressurized in the second compressor (322).

[0172] The first intercooler (331) can cool the ammonia evaporation gas introduced from the first compressor (321) using depressurized ammonia as a refrigerant. Therefore, the first intercooler (331) can cool the ammonia evaporation gas between the first compressor (321) and the second compressor (322). A portion of the ammonia evaporation gas introduced from the first compressor (321) to the first intercooler (331) can be supplied to the second compressor (322).

[0173] The first intercooler (331) may be connected to a second evaporation gas liquefaction line (L41a2) branched from the first evaporation gas liquefaction line (L41a1) upstream of the first intercooler (331) and provided with a pressure reducing valve (V6). In addition, the first evaporation gas liquefaction line (L41a1) passes through the interior of the first intercooler (331), and ammonia passing through the second intercooler (332) may pass through the first intercooler (331) along the first evaporation gas liquefaction line (L41a1) and be delivered to the ammonia storage tank (100). Heat exchange may occur between ammonia depressurized by the pressure reducing valve (V6) and ammonia flowing in the first evaporation gas liquefaction line (L41a1).

[0174] The ammonia vaporization gas cooled by the intercooler (330) can be recovered to the ammonia storage tank (100) together with the liquid ammonia separated by the gas-liquid separator (310). The ammonia cooled by the intercooler (330) and delivered along the first vaporization gas liquefaction line (L41a1) can be cooled by being depressurized by the pressure reducing valve (V7). The first vaporization gas liquefaction line (L41a1) can be connected to the vaporization gas recovery line (L42) of the vapor-liquid separator (310).

[0175] As described below, when the pressure of the ammonia storage tank (100) is higher than a preset value, an indicator (411, 412, 413) may be included to indicate this. A plurality of indicators (411, 412, 413) may be provided depending on the pressure of the ammonia storage tank (100). For example, the indicators may include a low-pressure indicator (411) to indicate that the pressure of the ammonia storage tank (100) is low, a medium-pressure indicator (412) to indicate that the pressure is medium, and a high-pressure indicator (413) to indicate that the pressure is high. At least one of the low-pressure indicator (411), the medium-pressure indicator (412), and the high-pressure indicator (413) may indicate that the pressure of the ammonia storage tank (100) is higher than a preset value. At this time, a control signal can be input by the low pressure display unit (411), the medium pressure display unit (412), and the high pressure display unit (413), and by the control signal, the ammonia evaporation gas compressed in the downstream of the first compressor (321), the downstream of the second compressor (322), or the third compressor (323) can be transmitted to the heating unit (200).

[0176]

[0177] FIG. 8 is a drawing for explaining an ammonia regasification system according to the eighth embodiment of the present invention.

[0178] Referring to FIG. 8, the ammonia regasification system (1) according to the eighth embodiment of the present invention may include an evaporation gas delivery unit (400) that delivers at least a portion of the compressed ammonia evaporation gas during the reliquefaction process of the reliquefaction unit (300) to the heating unit (200).

[0179] The vaporization gas delivery unit (400) can deliver ammonia vaporization gas to a demander according to the pressure of the ammonia storage tank (100). For example, the vaporization gas delivery unit (400) can supply ammonia vaporization gas to a demander when the pressure of the ammonia storage tank (100) is higher than a preset value. The pressure of the ammonia storage tank (100) can be measured by a storage tank pressure sensor (P2). The ammonia vaporization gas can be supplied to a demander through a heating unit (200).

[0180] The above-mentioned evaporation gas delivery unit (400) can deliver the ammonia evaporation gas of the re-liquefaction unit (300) to the heating unit (200) at multiple pressures. The above-mentioned evaporation gas delivery unit (400) can deliver the ammonia evaporation gas to the heating unit (200) at any one of low pressure, medium pressure, and high pressure.

[0181] The above-described evaporative gas delivery unit (400) may include a control unit (410), a first control valve (420), a second control valve (430), and a third control valve (440). The control unit (410) may receive a pressure signal from a storage tank pressure sensor (P2) and control the opening and closing of the first control valve (420), the second control valve (430), and the third control valve (440) based on the received pressure signal. For example, the control unit (410) may open at least one of the first control valve (420) provided on the first evaporative gas delivery line (L5), the second control valve (430) provided on the second evaporative gas delivery line (L6), and the third control valve (440) provided on the third evaporative gas delivery line (L7).

[0182] The control unit (410) supplies ammonia evaporation gas to a demander when the pressure of the ammonia storage tank (100) is higher than a preset value. At this time, the control unit (410) can control the opening and closing of the first control valve (420), the second control valve (430), and the third control valve (440). The control unit (410) can supply ammonia evaporation gas of different pressures to the demander by controlling the opening and closing of the first control valve (420), the second control valve (430), and the third control valve (440). That is, the control unit (410) can supply ammonia evaporation gas of different pressures to the demander.

[0183] The above-described evaporation gas delivery unit (400) can deliver ammonia evaporation gas compressed in at least one of the multi-stage compressors of the re-liquefaction unit (300) to the heating unit (200). The evaporation gas delivery unit (400) can deliver ammonia evaporation gas downstream of the first compressor (321) to the heating unit (200) (low-pressure mode). The evaporation gas delivery unit (400) can deliver ammonia evaporation gas downstream of the second compressor (322) to the heating unit (200) (medium-pressure mode). The evaporation gas delivery unit (400) can deliver ammonia evaporation gas downstream of the third compressor (323) to the heating unit (200) (high-pressure mode).

[0184] In detail, the evaporation gas delivery unit (400) can deliver ammonia evaporation gas downstream of the first compressor (321) to the heating unit (200) by opening the first control valve (420) (low pressure mode). In addition, the evaporation gas delivery unit (400) can deliver ammonia evaporation gas downstream of the second compressor (322) to the heating unit (200) by opening the second control valve (430) (medium pressure mode). The evaporation gas delivery unit (400) can deliver ammonia evaporation gas downstream of the third compressor (323) to the heating unit (200) by opening the third control valve (440) (high pressure mode).

[0185] The above-described evaporation gas delivery unit (400) can supply ammonia evaporation gas to the heating unit (200) or the demander at different pressures depending on the demand pressure of the demander. For example, the evaporation gas delivery unit (400) can deliver ammonia evaporation gas downstream of the first compressor (321) to the heating unit (200) when the demand pressure of the demander is low pressure. The evaporation gas delivery unit (400) can deliver ammonia evaporation gas downstream of the second compressor (322) to the heating unit (200) when the demand pressure of the demander is between low pressure and high pressure. The evaporation gas delivery unit (400) can deliver ammonia evaporation gas downstream of the third compressor (323) to the heating unit (200) when the demand pressure of the demander is high pressure.

[0186] For example, the vaporization gas delivery unit (400) may deliver ammonia vaporization gas downstream of the first compressor (321) that pressurizes the ammonia vaporization gas of the ammonia storage tank (100) to the heating unit (200) when the demand pressure of the demand source is lower than the first pressure, and may deliver ammonia vaporization gas downstream of the second compressor (322) provided downstream of the first compressor (321) to the heating unit (200) when the demand pressure of the demand source is the first pressure or the second pressure, and may deliver ammonia vaporization gas downstream of the third compressor (323) provided downstream of the second compressor (322) to the heating unit (200) when the demand pressure of the demand source is higher than the second pressure.

[0187] The control unit (410) may include display units (411, 412, 413) that indicate that the pressure of the ammonia storage tank (100) is higher than a preset value. A plurality of display units (411, 412, 413) may be provided depending on the pressure of the ammonia storage tank (100). For example, the display unit may include a low pressure display unit (411) that indicates that the pressure of the ammonia storage tank (100) is low, a medium pressure display unit (412) that indicates that the pressure is medium, and a high pressure display unit (413) that indicates that the pressure is high.

[0188] When the pressure of the ammonia storage tank (100) is higher than the preset value, at least one of the low pressure display unit (411), the medium pressure display unit (412), and the high pressure display unit (413) can indicate that the pressure of the ammonia storage tank (100) is higher than the preset value. For example, at least one of the low pressure display unit (411), the medium pressure display unit (412), and the high pressure display unit (413) can be turned on.

[0189] In addition, a control signal can be input by the low pressure display unit (411), the medium pressure display unit (412), and the high pressure display unit (413). The opening and closing of the first control valve (420), the second control valve (430), and the third control valve (440) can be controlled by the control signal. For example, when a control signal is input by the low pressure display unit (411), the control unit (410) can open the first control valve (420). The operator can input a control signal through the low pressure display unit (411), the medium pressure display unit (412), and the high pressure display unit (413).

[0190] The opening and closing of the first control valve (420), the second control valve (430), and the third control valve (440) can be controlled according to the demand pressure of the demand source. For example, when the demand pressure of the demand source is lower than the first pressure, the control unit (410) can transmit an opening signal to the first control valve (420). When the demand pressure of the demand source is between the first pressure and the second pressure, the control unit (410) can transmit an opening signal to the second control valve (430). When the demand pressure of the demand source is higher than the second pressure, the control unit (410) can transmit an opening signal to the third control valve (440).

[0191] The evaporation gas delivery unit (400) can deliver ammonia evaporation gas to the heating unit (200) along the evaporation gas delivery lines (L5, L6, L7). Specifically, the evaporation gas delivery unit (400) can deliver the ammonia evaporation gas downstream of the first heat exchanger (210). In addition, the evaporation gas delivery unit (400) can deliver the ammonia evaporation gas upstream of the second heat exchanger (220) provided in the heating unit (200) and controlling the temperature of the ammonia with a second heat exchanger. The second heat exchanger (220) can control the temperature of the ammonia to a temperature required by a demander.

[0192] The second fruit may be steam, and the steam may be condensed and discharged in a condensed state while passing through the second heat exchanger (220). The second fruit supply line (L3) may be connected to a boiler. The boiler supplies steam to the second heat exchanger (220) along the second fruit supply line (L3), and the condensed steam may be returned to the boiler.

[0193] The temperature sensor (T1) can transmit an open signal or a close signal to the second valve (V2). Accordingly, steam can bypass the second heat exchanger (220) along the second heat exchanger bypass line (L32), and the flow rate of the steam bypassing the second heat exchanger (220) can be controlled by the second valve (V2). The temperature sensor (T1) can transmit an open signal or a close signal to the second valve (V2) until the temperature of the ammonia is controlled to a preset temperature.

[0194] The supply of ammonia evaporation gas from the evaporation gas delivery unit (400) to the demand source and the re-liquefaction of ammonia evaporation gas from the ammonia storage tank (100) may proceed simultaneously or independently, but the present invention is not limited thereto.

[0195]

[0196] FIG. 9 is a drawing for explaining an ammonia regasification system according to the ninth embodiment of the present invention.

[0197] Referring to FIG. 9, an ammonia regasification system (1) according to a ninth embodiment of the present invention includes a heating unit (200) for heating ammonia in an ammonia storage tank (100) and supplying the heated ammonia to a demander; a re-liquefaction unit (300) for re-liquefying ammonia vaporization gas in the ammonia storage tank (100); and a vaporization gas delivery unit (400) for delivering at least a portion of the compressed ammonia vaporization gas in the re-liquefaction process of the re-liquefaction unit (300) to the heating unit (200). The heating unit (200) may include a first heat exchanger (210) for heat-exchanging the ammonia vaporization gas and the first heat.

[0198] The control unit (410) supplies ammonia evaporation gas to a demander when the pressure of the ammonia storage tank (100) is higher than a preset value, and at this time, the control unit (410) can control the opening and closing of the first control valve (420), the second control valve (430), and the third control valve (440).

[0199] The above-described evaporation gas delivery unit (400) can deliver ammonia evaporation gas compressed in at least one of the multi-stage compressors of the re-liquefaction unit (300) to the heating unit (200). The evaporation gas delivery unit (400) can deliver ammonia evaporation gas downstream of the first compressor (321) to the heating unit (200) (low-pressure mode). The evaporation gas delivery unit (400) can deliver ammonia evaporation gas downstream of the second compressor (322) to the heating unit (200) (medium-pressure mode). The evaporation gas delivery unit (400) can deliver ammonia evaporation gas downstream of the third compressor (323) to the heating unit (200) (high-pressure mode). Here, the heating unit (200) may be a second heat exchanger (220).

[0200] In addition, the ammonia vaporization gas compressed in at least one of the multi-stage compressors of the re-liquefaction unit (300) can be delivered to the first heat exchanger (210). That is, the ammonia vaporization gas compressed in at least one of the multi-stage compressors of the re-liquefaction unit (300) can be delivered to the second heat exchanger (220) by the vaporization gas delivery unit (400) or delivered to the first heat exchanger (210). The ammonia vaporization gas delivered to the first heat exchanger (210) can be liquefied and recovered to the ammonia storage tank (100).

[0201] The ammonia vaporization gas pressurized in the compressor (320) may be transferred to the first heat exchanger (210) or transferred to the second heat exchanger (220) through the vaporization gas transfer unit (400). That is, the compressor (320) may be used for re-liquefaction of the ammonia vaporization gas and supply of the ammonia vaporization gas to a demand source.

[0202]

[0203] The evaporation gas delivery unit (400) can deliver the ammonia evaporation gas downstream of the first heat exchanger (210). The evaporation gas delivery unit (400) can deliver the ammonia evaporation gas upstream of the second heat exchanger (220) provided in the heating unit (200) and controlling the temperature of the ammonia with the second heat medium. The second heat exchanger (220) can control the temperature of the ammonia to the temperature required by the consumer. At this time, the flow rate of the second heat medium bypassing the second heat exchanger (220) can be controlled based on the temperature measured by the temperature sensor (T1) provided downstream of the second heat exchanger (220).

[0204] A portion of the ammonia evaporation gas in the ammonia storage tank (100) is re-liquefied in the re-liquefaction unit (300) and recovered to the ammonia storage tank (100), and the remaining portion can be supplied to the demander by the evaporation gas delivery unit (400). Specifically, a portion of the ammonia evaporation gas can be recovered to the ammonia storage tank (100) after passing through the first compressor (321), the second compressor (322), and the third compressor (323), and then cooled in the first heat exchanger (210).

[0205] At this time, the first fruit supplied to the first heat exchanger (210) can be controlled by the re-liquefaction unit temperature sensor (T4). Specifically, based on the temperature of ammonia measured by the re-liquefaction unit temperature sensor (T4), the opening and closing of the bypass line valve (V8) provided in the first heat exchanger bypass line (L23) bypassing the first heat exchanger (210) can be controlled.

[0206]

[0207] FIG. 10 is a drawing for explaining an ammonia regasification system according to the tenth embodiment of the present invention.

[0208] Referring to FIG. 10, an ammonia regasification system (1) according to a tenth embodiment of the present invention includes a heating unit (200) for heating ammonia in an ammonia storage tank (100) and supplying the heated ammonia to a demander; a re-liquefaction unit (300) for re-liquefying ammonia vaporization gas in the ammonia storage tank (100); and a vaporization gas delivery unit (400) for delivering at least a portion of the compressed ammonia vaporization gas in the re-liquefaction process of the re-liquefaction unit (300) to the heating unit (200). The heating unit (200) may include a first heat exchanger (210) for heat-exchanging ammonia vaporization gas, a first heat source, and ammonia.

[0209] The first heat exchanger (210) can heat-exchange ammonia supplied to a demander along an ammonia supply line (L1), ammonia evaporation gas pressurized in a re-liquefaction unit (300), and the first heat medium supplied along a first heat medium supply line (L2). In the first heat exchanger (210), at least two of ammonia, ammonia evaporation gas, and the first heat medium can be heat-exchanged. The first heat exchanger (210) can vaporize ammonia in an ammonia storage tank (100). The first heat exchanger (210) can use at least one of the ammonia evaporation gas and the first heat medium as a heat medium. The first heat exchanger (210) can be a condenser of the ammonia evaporation gas and a vaporizer of ammonia. The ammonia evaporation gas and the first fruit may be fruits for the ammonia, and the ammonia and the first fruit may be refrigerants for the ammonia evaporation gas. That is, the first heat exchanger (210) can exchange heat between the ammonia evaporation gas pressurized in the reliquefaction unit (300) and the ammonia in the ammonia storage tank (100).

[0210] The transfer pump (110) can transfer ammonia to the first heat exchanger (210). The transfer pump (110) can pressurize the ammonia and transfer it to the heating unit (200). The head of the transfer pump (110) can be designed to meet the pressure requirement of the demander. The transfer pump (110) can meet the pressure requirement of the demander with the highest pressure requirement among the demanders to which ammonia can be supplied.

[0211] The flow rate of the first heat medium supplied to the first heat exchanger (210) can be controlled based on the temperature measured by the heating unit temperature sensor (T3) or the re-liquefaction unit temperature sensor (T4). The flow rate of the first heat medium bypassing the first heat exchanger (210) can be controlled based on the temperature measured by the heating unit temperature sensor (T3) or the re-liquefaction unit temperature sensor (T4). That is, the opening and closing of the bypass line valve (V8) can be controlled based on the temperature measured by the heating unit temperature sensor (T3) or the re-liquefaction unit temperature sensor (T4). The opening and closing of the bypass line valve (V8) can be controlled until the temperature of the ammonia is controlled to a preset temperature by the heating unit temperature sensor (T3) or the re-liquefaction unit temperature sensor (T4).

[0212] The re-liquefaction unit (300) can re-liquefy ammonia vaporization gas depending on the pressure of the ammonia storage tank (100). For example, the re-liquefaction unit (300) can re-liquefy ammonia vaporization gas when the pressure of the ammonia storage tank (100) is higher than a preset value. The re-liquefaction unit (300) may include a gas-liquid separator (310), a compressor (320), an intercooler (330), and the like.

[0213] The above compressor (320) may include a first compressor (321) that pressurizes ammonia vaporization gas of the ammonia storage tank (100); a second compressor (322) that pressurizes ammonia vaporization gas pressurized in the first compressor (321); and a third compressor (323) that pressurizes ammonia vaporization gas pressurized in the second compressor (322).

[0214] The pressure of the ammonia storage tank (100) can be measured by the storage tank pressure sensor (P2). The vaporization gas delivery unit (400) can deliver ammonia vaporization gas to the heating unit (200) according to the pressure of the ammonia storage tank (100). The ammonia vaporization gas delivered by the vaporization gas delivery unit (400) may be pressurized by the compressor (320) of the reliquefaction unit (300).

[0215] The evaporation gas delivery unit (400) can deliver at least one of the ammonia evaporation gas downstream of the first compressor (321), the ammonia evaporation gas downstream of the second compressor (322), and the ammonia evaporation gas downstream of the third compressor (323) to the downstream of the first heat exchanger (210) or the upstream of the second heat exchanger (220).

[0216] Ammonia passing through the first heat exchanger (210) can join at least one of the ammonia boil-off gas downstream of the first compressor (321), the ammonia boil-off gas downstream of the second compressor (322), and the ammonia boil-off gas downstream of the third compressor (323) upstream of the second heat exchanger (220). The temperature of the ammonia passing through the first heat exchanger (210) can be controlled by the ammonia boil-off gas delivered from the compressor (320). Specifically, the ammonia can be heated by the ammonia boil-off gas delivered from the third compressor (323). The ammonia boil-off gas can be delivered to the second heat exchanger (220). The second heat exchanger (220) can control the temperature of the ammonia boil-off gas to a temperature required by a consumer.

[0217]

[0218] In this way, the ammonia regasification system (1) according to one embodiment of the present invention can control the pressure of the ammonia storage tank (100) by operating at least one of the heating unit (200), the reliquefaction unit (300), and the evaporation gas transfer unit (400). Therefore, the ammonia storage tank (100) can be safely managed and operated.

[0219] At this time, the evaporation gas delivery unit (400) sends the ammonia evaporation gas of the ammonia storage tank (100) to the demander and can use the compressor (320) of the reliquefaction unit (300) or the second heat exchanger (220) of the heating unit (200), so the installation cost of a separate device for the evaporation gas delivery unit (400) can be reduced.

[0220] In addition, the supply of ammonia evaporation gas to demanders, regasification of ammonia, and reliquefaction of ammonia evaporation gas are integrated, so that ammonia management and use can be carried out efficiently.

[0221] In addition, according to an ammonia regasification system (1) according to one embodiment of the present invention, the cold energy of ammonia stored in an ammonia storage tank can be utilized to reliquefy ammonia evaporation gas. In particular, when ammonia is used as a refrigerant compared to the first heat, the amount of flash gas generated can be reduced.

[0222] Additionally, through re-liquefaction, ammonia vapor can be supplied as a product, and the ammonia vapor can be prevented from being incinerated to maintain the pressure in the ammonia storage tank.

[0223] In addition, the ammonia regasification system (1) according to one embodiment of the present invention can pressurize the ammonia vaporization gas in the ammonia storage tank (100) and supply it to the demander by using the compressor included in the reliquefaction unit (300) without installing a separate compressor. In particular, ammonia vaporization gas of various pressures can be supplied to the demander by using a plurality of compressors included in the reliquefaction unit (300). Therefore, it is possible to supply the ammonia vaporization gas according to the pressure required by the demander.

[0224] In particular, the ammonia regasification system (1) according to one embodiment of the present invention can control the pressure of ammonia evaporation gas delivered to a demand source by using a line branching from a compressor (320) and a valve for opening and closing the line.

[0225] In addition, according to an ammonia regasification system (1) according to one embodiment of the present invention, heat from ammonia vaporization gas can be utilized for ammonia regasification. Accordingly, the amount of heat required for ammonia regasification can be reduced.

[0226] In addition, the ammonia regasification system (1) according to one embodiment of the present invention can satisfy the temperature required by the consumer through the first heat exchanger (210) and the second heat exchanger (220). In particular, the flow rate of the first heat medium supplied to the first heat exchanger (210) can be adjusted based on the temperature of the ammonia evaporation gas or ammonia that has passed through the first heat exchanger (210). Accordingly, the temperature of the ammonia that has passed through the first heat exchanger (210) can be adjusted. In addition, the second heat exchanger (220) can supply ammonia at the temperature required by the consumer by adjusting the flow rate of the second heat medium.

[0227] The first heat source may be seawater, and the temperature of the seawater may vary depending on the location of the sea, etc. In this case, the temperature of the ammonia supplied to the demand source may be affected by the temperature of the seawater. However, according to the ammonia regasification system (1) according to one embodiment of the present invention, the influence of seawater can be reduced in controlling the temperature of the ammonia by using the ammonia evaporation gas of the first heat exchanger (210) or the second heat source of the second heat exchanger (220). Therefore, the limitation of the regasification performance of the ammonia regasification system (1) depending on the seawater temperature can be overcome.

[0228] In addition, since the first heat exchanger (210) can heat-exchange ammonia, ammonia evaporation gas, and the first heat product, a separate heat exchanger for heat-exchanging the first heat product and ammonia can be omitted.

[0229] The first heat exchanger (210) can be used to re-liquefy the ammonia evaporation gas and the ammonia together with the first heat source, or to re-gasify the ammonia, thereby reducing the amount of the first heat source supplied to the first heat exchanger (210). Accordingly, the capacity of the first heat source supply pump (230) can be reduced. In addition, the operating cost of the first heat source supply pump (230) can be reduced.

[0230] In addition, the ammonia regasification system (1) according to one embodiment of the present invention can be applied to a combination vessel without installing additional equipment as well as an ammonia FSRU.

[0231] The present invention is not limited to the embodiments described above, and may include a combination of the above embodiments or a combination of at least one of the above embodiments and a known technology as another embodiment.

[0232] While the present invention has been described above with reference to embodiments thereof, these are merely examples and are not intended to limit the present invention. Those skilled in the art will appreciate that various combinations, modifications, and applications not illustrated in the embodiments are possible without departing from the essential technical contents of the embodiments. Accordingly, technical contents related to modifications and applications that can be easily derived from the embodiments of the present invention should be construed as being included in the present invention.

Claims

1. A heating unit that heats ammonia in an ammonia storage tank and supplies it to the demander; A re-liquefaction unit that re-liquefies the ammonia evaporation gas of the above ammonia storage tank; and An ammonia regasification system comprising an evaporation gas delivery unit that delivers at least a portion of the compressed ammonia evaporation gas to the heating unit during the re-liquefaction process of the re-liquefaction unit.

2. In paragraph 1, The above evaporative gas transmission unit is, An ammonia regasification system capable of transferring ammonia vaporization gas from the above reliquefaction unit to the above heating unit at multiple pressures.

3. In paragraph 2, The above evaporative gas transmission unit is, An ammonia regasification system that controls the pressure of ammonia vaporization gas according to the pressure demanded by the above-mentioned demand source and delivers the ammonia vaporization gas to the above-mentioned heating unit.

4. In paragraph 1, The above evaporative gas transmission unit is, An ammonia regasification system that delivers compressed ammonia vapor gas from one of the multi-stage compressors of the above re-liquefaction unit to the heating unit.

5. In paragraph 1, The above re-liquefaction unit, A compressor for compressing ammonia vapor gas; The above compressor, A first compressor for pressurizing ammonia evaporation gas of the above ammonia storage tank; A second compressor for pressurizing the ammonia vapor gas pressurized in the first compressor; and An ammonia regasification system comprising a third compressor for pressurizing ammonia vapor gas pressurized in the second compressor.

6. In paragraph 5, The above evaporative gas transmission unit is, Transferring the ammonia evaporation gas downstream of the first compressor to the heating unit, or Transferring the ammonia vapor gas downstream of the second compressor to the heating unit, or An ammonia regasification system that transfers ammonia vaporization gas downstream of the third compressor to the heating unit.

7. In paragraph 1, The above evaporative gas transmission unit is, An ammonia regasification system that is provided in the above heating section and delivers ammonia vaporization gas upstream of a heat exchanger that heats ammonia.

8. A heating unit that heats ammonia in an ammonia storage tank and supplies it to the demander; and It includes a re-liquefaction unit that re-liquefies the ammonia evaporation gas of the ammonia storage tank; The above heating part, An ammonia regasification system comprising: a first heat exchanger for exchanging heat between ammonia vapor, first heat and ammonia.

9. In paragraph 8, An ammonia regasification system, comprising: an evaporation gas delivery unit that delivers at least a portion of the compressed ammonia evaporation gas to the heating unit during the re-liquefaction process of the re-liquefaction unit.

10. In paragraph 9, The above evaporative gas transmission unit is, An ammonia regasification system that delivers compressed ammonia vapor gas from one of the multi-stage compressors of the above re-liquefaction unit to the heating unit.

11. In paragraph 9, The above evaporative gas transmission unit is, An ammonia regasification system that controls the pressure of ammonia vaporization gas according to the pressure demanded by the above-mentioned demand source and delivers the ammonia vaporization gas to the above-mentioned heating unit.

12. In paragraph 9, The above evaporative gas transmission unit is, An ammonia regasification system that is provided downstream of the first heat exchanger and transfers ammonia vaporization gas upstream of a second heat exchanger that heats ammonia as a second heat source.

13. In paragraph 12, The above re-liquefaction unit, A compressor for compressing ammonia vapor gas; An ammonia regasification system in which the ammonia vaporized gas pressurized in the above compressor is transferred to the first heat exchanger or to the second heat exchanger.

14. In paragraph 9, The above first heat exchanger, An ammonia regasification system that exchanges heat between ammonia vaporized gas pressurized in the above re-liquefaction unit and ammonia in the above ammonia storage tank.

15. A vessel comprising an ammonia regasification system according to any one of paragraphs 1 to 14.

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