KR102548339B1 - Gas management system in ships - Google Patents

Abstract

A ship's gas management system is disclosed. A ship's gas management system according to an embodiment of the present invention includes a storage tank accommodating liquid ammonia and ammonia gas generated therefrom, a boosting pump for pressurizing the liquid ammonia in the storage tank, and the liquid phase pressurized by the boosting pump. A fuel gas supply line that supplies ammonia to the engine as fuel gas, a gas treatment line that extracts ammonia gas from the storage tank, a fuel gas return line that circulates surplus gas not consumed in the engine, and ammonia gas extracted by the gas treatment line and a gas mixing unit mixing and joining at least one of the surplus gas circulated by the fuel gas return line toward the fuel gas supply line.

Description

Ship's gas management system {GAS MANAGEMENT SYSTEM IN SHIPS}

The present invention relates to a gas management system of a ship, and more particularly, to a gas management system and operating method of a ship capable of efficiently managing liquid ammonia and boil-off gas generated therefrom while promoting the stability of facility operation. It is about.

As environmental regulations on the emission of greenhouse gases and various air pollutants are strengthened, countries around the world are focusing on the development of ships using eco-friendly and low-carbon fuel gas instead of using heavy oil and diesel oil, which are existing fuels.

A method of using natural gas as an energy source to replace existing fossil fuels has been considered as the most promising. However, natural gas is phase-changed into liquefied natural gas for efficiency in handling and is managed and operated. The disadvantage is that it costs a lot to build related infrastructure such as a refueling port or a bunkering ship.

In recent years, ammonia (NH3) has been in the limelight as a next-generation eco-friendly energy source. For example, various technologies are being developed for using ammonia as a power source for engines of ships or various power generation facilities, or for producing electricity through ammonia.

This ammonia has a liquefaction point of about -33 ° C at atmospheric pressure, and is stored and transported in a storage tank installed after being insulated on the hull. Since it is practically impossible to completely insulate liquid ammonia, liquid ammonia is stored inside the storage tank. Ammonia gas generated by vaporization is accumulated.

Ammonia gas not only causes deformation and damage of the storage tank by increasing the internal pressure of the storage tank, but also has properties that are very harmful to the human body even at a small concentration. In addition, since ammonia has a lower specific gravity than air and is easily diffused, it is very likely to pose a safety threat such as an explosion or a human accident. Therefore, in using ammonia as an energy source, a method for stably processing and managing ammonia gas generated therefrom is required.

Republic of Korea Patent Publication No. 10-2018-0124365 (published on November 21, 2018)

This embodiment is intended to provide a gas management system for a ship that can efficiently utilize and manage liquid ammonia and ammonia gas generated therefrom.

The present embodiment aims to provide a gas management system for a ship capable of efficient gas operation with a simple structure.

The present embodiment is intended to provide a gas management system for a ship capable of stably supplying fuel gas to an engine and improving energy efficiency.

The present embodiment is intended to provide a gas management system for ships capable of promoting structural stability of facilities.

The present embodiment is intended to provide a gas management system of a ship that can promote the safety of facility operation by preventing explosions or human accidents.

According to one aspect of the present invention, a storage tank for accommodating liquid ammonia and ammonia gas generated therefrom; a fuel gas supply line having a boosting pump for pressurizing the liquid ammonia in the storage tank and supplying the liquid ammonia pressurized by the boosting pump as fuel gas to the engine; a gas treatment line for extracting ammonia gas from the storage tank; a fuel gas return line for circulating excess gas not consumed in the engine; and a gas mixing unit for mixing and joining at least one of the ammonia gas extracted by the gas treatment line and the surplus gas circulated by the fuel gas return line to the side of the fuel gas supply line.

The gas mixing unit may be provided including a static mixer provided at a front end of the boosting pump on the fuel gas supply line.

The gas mixing unit may further include a mixing tank provided at a rear end of the static mixer on the fuel gas supply line.

The gas mixing unit may be provided including a recondenser provided at a front end of the boosting pump on the fuel gas supply line.

An outlet of the gas processing line may be connected to the static mixer, and an outlet of the fuel gas return line may be connected to join a front side of the static mixer on the fuel gas supply line.

An outlet of the gas processing line may be connected to the static mixer, and an outlet of the fuel gas return line may be connected to the mixing tank.

An outlet of the gas treatment line and an outlet of the fuel gas return line may be connected to the recondenser.

The fuel gas return line may include a fuel cooler for cooling the surplus gas and an expansion valve for reducing the surplus gas cooled by the fuel cooler.

The fuel gas supply line may further include a fuel heater for heating the liquid ammonia pressurized by the boosting pump.

The fuel gas return line may include a fuel cooler for cooling the surplus gas, and a heat exchange unit for exchanging heat with ammonia on the fuel gas supply line for the surplus gas cooled by the fuel cooler.

The fuel gas supply line further includes a fuel heater for heating the liquid ammonia pressurized by the boosting pump, and the heat exchange unit transfers excess gas cooled by the fuel cooler to a front end side of the fuel heater on the fuel gas supply line. It can exchange heat with liquid ammonia.

The boosting pump includes a first boosting pump provided between the static mixer and the mixing tank on the fuel gas supply line, and a second boosting pump provided at the rear end of the mixing tank on the fuel gas supply line. can

The fuel gas supply line may further include an injection line for injecting liquid ammonia introduced into the mixing tank into an upper portion of the mixing tank.

The fuel gas supply line may further include an injection line for injecting liquid ammonia into the upper portion of the recondenser.

The gas processing line may include a compression unit pressurizing the ammonia gas in the storage tank.

The compression unit may include a compressor for compressing the ammonia gas in the storage tank, and a gas cooler for cooling the ammonia gas pressurized and heated by the compressor by exchanging heat with seawater.

The ship's gas management system according to this embodiment can efficiently utilize and manage liquid ammonia and ammonia gas generated therefrom.

The ship's gas management system according to this embodiment can stably supply fuel gas to the engine and improve energy efficiency.

The ship's gas management system according to this embodiment has a simple structure and can perform efficient gas operation.

The ship's gas management system according to this embodiment can promote structural stability of the facility.

The ship's gas management system according to this embodiment can promote safety in facility operation by preventing explosions or human accidents in advance.

1 is a conceptual diagram showing a gas management system for a ship according to a first embodiment of the present invention.
2 is a conceptual diagram showing a gas management system for a ship according to a second embodiment of the present invention.
3 is a conceptual diagram showing a gas management system for a ship according to a third embodiment of the present invention.
4 is a conceptual diagram showing a gas management system for a ship according to a fourth embodiment of the present invention.

Hereinafter, this embodiment will be described in detail with reference to the accompanying drawings. The following examples are presented to sufficiently convey the spirit of the present invention to those skilled in the art. The present invention may be embodied in other forms without being limited to only the embodiments presented herein. In the drawings, in order to clarify the present invention, illustration of parts irrelevant to the description may be omitted, and the size of components may be slightly exaggerated to aid understanding.

1 is a conceptual diagram showing a gas management system 100 for a ship according to a first embodiment of the present invention.

Ammonia (NH3) is in the limelight as a next-generation eco-friendly energy source. However, ammonia has properties harmful to the human body even at very low concentrations, and in particular, since it has a lower specific gravity than air and is easily diffused, there is a high risk of safety such as explosion or human accident.

Accordingly, the ship's gas management system 100 according to this embodiment is prepared to stably manage and process ammonia gas generated by naturally vaporizing from liquid ammonia when ammonia is used as fuel gas in the ship's engine 10. do.

Referring to FIG. 1, the ship's gas management system 100 according to the first embodiment of the present invention is a fuel for supplying a storage tank 110 and liquid ammonia in the storage tank 110 to the engine 10 as fuel gas. The gas supply line 120, the fuel gas return line 130 that circulates surplus fuel gas not consumed in the engine 10 (hereinafter referred to as 'surplus gas') to resupply, and the storage tank 110 A gas treatment line 140 for extracting and treating gaseous ammonia (hereinafter referred to as 'ammonia gas'), ammonia gas extracted by the gas treatment line 140 and surplus circulated by the fuel gas return line 130 A gas mixing unit 150 for mixing and joining at least one of the gases to the fuel gas supply line 120 may be provided.

In this embodiment, ammonia (NH3) is applied to help understanding of the invention, but it is not limited thereto, and various liquefied gases with high liquefaction points such as liquefied ethane gas and liquefied propane gas (LPG) and evaporation generated therefrom Even when gas is applied, it can be understood with the same technical idea.

The storage tank 110 is provided to accommodate or store liquid ammonia and ammonia gas generated therefrom. The storage tank 110 may be provided as an insulated cargo hold to minimize vaporization of liquid ammonia due to external heat intrusion. The storage tank 110 receives or stores liquid ammonia supplied from an ammonia production area, etc., and stably stores liquid ammonia and ammonia gas until reaching the destination and unloading, or, as will be described later, an engine for propulsion or power generation of a ship. It can be stored to be used as fuel gas for (10).

The storage tank 110 is generally insulated and installed, but since it is practically difficult to completely block external heat penetration, ammonia gas generated by the natural vaporization of liquid ammonia exists inside the storage tank 110 . Since such ammonia gas raises the internal pressure of the storage tank 110 and poses a risk of deformation and explosion of the storage tank 110, there is a need to remove or treat the ammonia gas from the storage tank 110. Accordingly, ammonia gas generated and received in the storage tank 110 may be extracted and re-liquefied by a gas processing line 140 to be described later, and supplied to the engine 10 as fuel gas. A detailed description of this will be described later.

The engine 10 receives liquid ammonia contained in the storage tank 110 as fuel gas to generate propulsion of the ship or generate power for power generation such as internal facilities of the ship. In FIG. 1, one engine 10 is shown as provided, but is not limited thereto, and a high-pressure engine generating propulsion of the hull by receiving a relatively high-pressure fuel gas and a relatively low-pressure fuel gas supplied It may be made up of a plurality of low-pressure engines that generate power for power generation of ships.

The fuel gas supply line 120 is provided to supply liquid ammonia contained in the storage tank 110 to the engine 10 as fuel gas.

The fuel gas supply line 120 is provided with an inlet end connected to the inside of the storage tank 110, and a gas mixing unit 150 to be described later may be provided at the intermediate end, and the fuel gas supply line 120 The outlet side end may be connected to an inlet side end of a fuel gas return line 130 to be described later via the engine 10 .

A transfer pump 125 may be provided at an end of the inlet side of the fuel gas supply line 120 to deliver liquid ammonia contained in the storage tank 110 to the engine 10 side. In addition, the fuel gas supply line 120 may be provided with a boosting pump 121 that pressurizes the liquid ammonia sent by the transfer pump 125 to correspond to the fuel gas pressure condition required by the engine 10 . A gas mixing unit 150 to be described later is provided at the front end of the boosting pump 121, and at least one of the ammonia gas extracted through the gas processing line 140 and the surplus gas circulated by the fuel gas return line 130 are mixed and can join A detailed description of this will be described later.

A fuel heater 122 for heating the pressurized liquid ammonia transferred along the fuel gas supply line 120 may be provided at a rear end of the boosting pump 121 . The fuel heater 122 may heat or vaporize the liquid ammonia pressurized through the boosting pump 121 in accordance with the temperature condition of the fuel gas required by the engine 10 . The fuel heater 122 is provided as a heat exchange device to heat or vaporize the pressurized liquid ammonia by exchanging heat with a heat source.

The fuel gas return line 130 is provided to circulate and resupply surplus fuel gas that has not been consumed by the engine 10 according to a change in output of the engine 10 .

The inlet side end of the fuel gas return line 130 is connected to the fuel gas supply line 120 via the engine 10, and the outlet side end is connected to the front end of the boosting pump 121 on the fuel gas supply line 120. By merging, surplus gas not consumed in the engine 10 can be circulated and re-supplied to the fuel gas supply line 120 . A fuel cooler 131 is provided in the fuel gas return line 130 to cool the high-temperature surplus gas recovered from the engine 10, and the surplus gas cooled by the fuel cooler 131 opens the expansion valve 132. While going through, it may be reduced to a level corresponding to the pressure of the liquid ammonia in front of the boosting pump 121 on the fuel gas supply line 120. The fuel cooler 131 is provided as a heat exchanger and can cool the excess gas by exchanging heat with seawater or the like.

The gas processing line 140 is provided to extract, process, and utilize ammonia gas generated and received inside the storage tank 110 .

The gas processing line 140 may have an inlet end connected to the storage tank 110 and an outlet end connected to the fuel gas supply line 120 via a gas mixing unit 150 to be described later. The treatment line 140 may include a compression unit 141 that pressurizes the ammonia gas in the storage tank 110 to be extracted.

The compression unit 141 is provided to extract ammonia gas from the storage tank 110 by introducing it into the gas processing line 140 . In the compression unit 141, a compressor 141a for compressing ammonia gas and a gas cooler 141b for cooling the heated ammonia gas through the compressor 141a may be sequentially disposed. The gas cooler 141b is provided to cool the pressurized and heated ammonia gas while passing through the compressor 141a. The gas cooler 141b is provided as a heat exchanger and can be cooled by exchanging heat with high-temperature pressurized ammonia gas such as seawater.

The compressor 141a smoothly extracts the ammonia gas generated and received inside the storage tank 110, and at the same time facilitates mixing and joining to the fuel gas supply line 120 side through the gas mixing unit 150 described later. The ammonia gas may be compressed to achieve re-liquefaction. Ammonia gas has a liquefaction point of about -33°C at atmospheric pressure, but has a liquefaction point of about 10°C at 6 bar. That is, since the compressor 141a compresses the ammonia gas, re-liquefaction can be performed even at a relatively high temperature, which means that re-liquefaction efficiency can be improved. Therefore, the liquefaction point can be increased by compressing the ammonia gas by the compressor 141a, and further, the re-liquefaction efficiency of the ammonia gas can be increased.

On the other hand, in FIG. 1, the compressor 141a and the gas cooler 141b are shown as being arranged in one stage, but this number can be variously changed according to the standard of the compressor and cooler or the pressurization level of ammonia gas as an example. can In addition, as shown in FIGS. 2 to 4 described later, ammonia gas may be introduced and extracted only by a compressor without a separate gas cooler, and the pressurized and heated ammonia gas may be cooled and re-liquefied through a gas mixing unit.

The gas mixing unit 150 transfers at least one of the ammonia gas of the storage tank 110 extracted through the gas processing line 140 and the surplus gas circulated through the fuel gas return line 130 to the fuel gas supply line 120. ) side is provided to mix and join.

The ammonia gas delivered through the gas treatment line 140 and the surplus gas circulated through the fuel gas return line 130 are both pressurized and relatively high-temperature gaseous ammonia gas, whereas the fuel gas supply line 120 Liquid ammonia in a liquid state having a relatively low temperature introduced from the silver storage tank 110 is transported. Therefore, the gas mixing unit 150 stably mixes gaseous ammonia gas and liquid ammonia and simultaneously re-liquefies the gaseous ammonia gas and joins it to the fuel gas supply line 120 so that the engine 10 of fuel gas can be utilized.

The gas mixing unit 150 may include a static mixer 151. The static mixer 151 may be provided at the front end of the boosting pump 121 on the fuel gas supply line 120, and the outlet side end of the gas processing line 140 may be connected to the static mixer 151. As a result, the liquid ammonia transported through the fuel gas supply line 120 and the ammonia gas extracted and transported through the gas treatment line 140 can flow together into the static mixer 151, and the static mixer 151 By dispersing ammonia gas into liquid ammonia, cooling and re-liquefaction of ammonia gas can occur. The liquid component re-liquefied while being mixed in the static mixer 151 may be supplied to the boosting pump 121 and pressurized.

On the other hand, in FIG. 1, the outlet side end of the fuel gas return line 130 is shown as joining the front end of the static mixer 151 on the fuel gas supply line 120, but this is limited to that position as an example. It is not. In other words, as shown in FIG. 1, when the outlet side end of the fuel gas return line 130 is connected to the front end of the static mixer 151 on the fuel gas supply line 120, the excess gas is transferred to the transfer pump 125 It can be used as fuel gas of the engine 10 after being re-liquefied as it flows into the static mixer 151 after being mixed and joined with liquid ammonia sent by the engine 10. In contrast, when the outlet side end of the fuel gas return line 130 is connected to the static mixer 151 like the outlet side end of the gas processing line 140, the excess gas is delivered through the gas processing line 140. Like ammonia gas, it can be used and processed as fuel gas of the engine 10 after being re-liquefied while being dispersed and mixed with liquid ammonia introduced into the static mixer 151 through the fuel gas supply line 120.

Hereinafter, a gas management system 200 for a ship according to a second embodiment of the present invention will be described.

2 is a conceptual diagram showing a gas management system 200 of a ship according to a second embodiment of the present invention. Referring to FIG. A fuel gas supply line 120 for supplying fuel gas, a fuel gas return line 130 for circulating surplus gas not consumed in the engine 10 to resupply, extracting and treating ammonia gas in the storage tank 110 Gas processing line 140, a gas mixing unit for mixing and joining the ammonia gas extracted by the gas processing line 140 and the excess gas circulated by the fuel gas return line 130 toward the fuel gas supply line 120 side ( 250) may be provided.

Among the descriptions of the ship's gas management system 200 according to the second embodiment of the present invention described below, the ship's gas according to the first embodiment of the present invention described above, except when additionally described with separate reference numerals. It is the same as the description of the management system 100, and the description is omitted to prevent duplication of contents.

The gas mixing unit 250 mixes the ammonia gas of the storage tank 110 extracted through the gas processing line 140 and the surplus gas circulated through the fuel gas return line 130 toward the fuel gas supply line 120 and prepared to join.

The ammonia gas delivered through the gas treatment line 140 and the surplus gas circulated through the fuel gas return line 130 are both pressurized and relatively high-temperature gaseous ammonia gas, whereas the fuel gas supply line 120 Liquid ammonia in a liquid state having a relatively low temperature introduced from the silver storage tank 110 is transported. Therefore, the gas mixing unit 150 stably mixes gaseous ammonia gas and liquid ammonia and simultaneously re-liquefies the gaseous ammonia gas and joins it to the fuel gas supply line 120 so that the engine 10 of fuel gas can be utilized.

The gas mixing unit 150 may include a static mixer 151 and a mixing tank 251 . The static mixer 151 and the mixing tank 251 may be sequentially provided at the front end of the boosting pump 121 on the fuel gas supply line 120, and the outlet side end of the gas treatment line 140 is the static mixer 151 ), and the outlet side end of the fuel gas return line 130 may be connected to the mixing tank 251. As a result, the liquid ammonia transported through the fuel gas supply line 120 and the ammonia gas extracted and transported through the gas treatment line 140 can be introduced together into the static mixer 151, and the static mixer 151 is ammonia. Dispersing the gas into liquid ammonia can cause cooling and re-liquefaction of the ammonia gas. In addition, excess gas circulated through the fuel gas return line 130 flows into the mixing tank 251, and liquid ammonia from the static mixer 151 also flows into the mixing tank 251 through the fuel gas supply line 120 As a result, the excess gas is mixed with the liquid ammonia inside the mixing tank 251 to cause cooling and re-liquefaction of the excess gas.

Meanwhile, the surplus gas circulated through the fuel gas return line 130 and introduced into the mixing tank 251 may generate gaseous components such as flash gas while passing through the expansion valve 132 . When such a gas component is introduced into a pump or the like, it may cause a decrease in output or failure of the pump, so it is necessary to select and supply a liquid component to the pump side. Accordingly, the mixing tank 251 receives, mixes, and accommodates the flow of liquid ammonia and re-liquefied gas introduced through the fuel gas supply line 120 and the surplus gas circulated through the fuel gas return line 130, It can be separated and selected to be supplied to the boosting pump 121 side. The mixing tank 251 may be provided as a pressurized tank to stably accommodate it despite the pressure of the gas flow introduced into the inside, and the boosting pump separates and selects the liquid component among the ammonia components in the gas-liquid mixed state. The fuel gas supply line 120 may be connected to the bottom side of the mixing tank 251 and extend toward the boosting pump 121 so as to be supplied to the fuel gas supply line 121.

An injection line 260 may be provided to increase a ratio of a liquid component in a gas flow in a gas-liquid mixture state introduced into the mixing tank 251 . The injection line 260 injects the liquid ammonia introduced into the fuel gas supply line 120 to the upper inside of the mixing tank 251, thereby re-liquefying the gas component contained in the mixing tank 251. To this end, the inlet end of the injection line 260 is branched from the fuel gas supply line 120, but branched from the front end of the static mixer 151 on the fuel gas supply line 120 to receive low-temperature liquid ammonia. The outlet side end may be disposed above the inside of the mixing tank 251, and a plurality of injection nozzles for injecting liquid ammonia may be provided.

In this way, the ammonia gas generated and received inside the storage tank 110 by the static mixer 151 of the gas mixing unit 250 is mixed with liquid ammonia and re-liquefied to be used as fuel gas for the engine 10. . At the same time, excess gas not consumed in the engine 10 may be mixed with liquid ammonia and re-liquefied by the mixing tank 251 of the gas mixing unit 250 to be recycled as fuel gas of the engine 10 .

Hereinafter, a ship gas management system 300 according to a third embodiment of the present invention will be described.

3 is a conceptual diagram showing a gas management system 300 for a ship according to a third embodiment of the present invention. Referring to FIG. A fuel gas supply line 120 for supplying fuel gas, a fuel gas return line 130 for circulating surplus gas not consumed in the engine 10 to resupply, extracting and treating ammonia gas in the storage tank 110 Gas processing line 140, a gas mixing unit for mixing and joining the ammonia gas extracted by the gas processing line 140 and the excess gas circulated by the fuel gas return line 130 toward the fuel gas supply line 120 side ( 250), and the fuel gas supply line 120 may include a boosting pump 321 that pressurizes the introduced liquid ammonia step by step.

Among the descriptions of the ship's gas management system 300 according to the third embodiment of the present invention described below, except when additionally described with separate reference numerals, ship's gas according to the second embodiment of the present invention described above. It is the same as the description of the management system 200, and the description is omitted to prevent duplication of contents.

The fuel gas supply line 120 may be provided with a plurality of boosting pumps 321 that step-by-step pressurize the liquid ammonia sent by the transfer pump 125 in accordance with the fuel gas pressure condition required by the engine 10. . The boosting pump 321 is provided at the rear end of the first boosting pump 321a, which primarily pressurizes the liquid ammonia sent by the transfer pump 125, and the first boosting pump 321, and is separated from the mixing tank 251. It may include a second boosting pump (321b) for secondarily pressurizing the liquid component.

As described above, the fuel gas return line 130 circulates excess gas that is not consumed in the engine 10 and supplies it to the mixing tank 251 again. Since the surplus gas is in a pressurized state corresponding to the pressure condition required by the engine 10, the internal pressure of the mixing tank 251, that is, the pressure of liquid ammonia flowing into the mixing tank 251 through the fuel gas supply line 120 It should be supplied to the mixing tank 251 after the pressure is reduced to a level corresponding to . To this end, an expansion valve 132 is provided in the fuel gas return line 130, and as the internal pressure of the mixing tank 251 is lowered, the degree of decompression through the expansion valve 132 increases. The degree of decompression of the surplus gas increases There is a problem in that the amount of gas components such as flash gas is also increased.

Accordingly, the boosting pump 321 of the fuel gas supply line 120 is provided with a first boosting pump 321a and a second boosting pump 321b that pressurize the liquid ammonia step by step or sequentially, and the first boosting pump 321a ) is disposed between the static mixer 151 and the mixing tank 251 on the fuel gas supply line 120, and the mixing tank 251 is disposed in front of the second boosting pump 321b on the fuel gas supply line. By arranging, By lowering the degree of depressurization of the surplus gas of the expansion valve 132 for supplying the mixing tank 251, the amount of gas components generated during decompression can be suppressed and minimized.

In addition, as the first boosting pump 321a is disposed at the rear end of the static mixer 151 on the fuel gas supply line 120 to pressurize the re-liquefied ammonia gas flow delivered from the static mixer 151, the gas Since the compression unit 141 of the processing line 140 pressurizes the ammonia gas only to a relatively low pressure level and supplies it to the static mixer 151, the compressor specifications of the compression unit 141 can be lowered and operating costs can be reduced.

The injection line 260 is connected to the rear end of the first boosting pump 221a on the fuel gas supply line 120 at the inlet side end, so that liquid ammonia can be supplied and injected into the mixing tank 251 .

Hereinafter, a ship gas management system 400 according to a fourth embodiment of the present invention will be described.

4 is a conceptual diagram showing a gas management system 400 for a ship according to a fourth embodiment of the present invention. Referring to FIG. A fuel gas supply line 120 for supplying fuel gas, a fuel gas return line 130 for circulating surplus gas not consumed in the engine 10 to resupply, extracting and treating ammonia gas in the storage tank 110 Gas processing line 140, a gas mixing unit for mixing and joining the ammonia gas extracted by the gas processing line 140 and the excess gas circulated by the fuel gas return line 130 toward the fuel gas supply line 120 side ( 450) may be provided.

Among the descriptions of the ship's gas management system 400 according to the fourth embodiment of the present invention described below, the ship's gas according to the first embodiment of the present invention described above, except when additionally described with separate reference numerals. It is the same as the description of the management system 100, and the description is omitted to prevent duplication of contents.

The fuel gas return line 130 is provided to circulate and resupply surplus fuel gas that has not been consumed by the engine 10 according to a change in output of the engine 10 .

The inlet side end of the fuel gas return line 130 is connected to the fuel gas supply line 120 via the engine 10, and the outlet side end is connected to the recondenser 451 of the gas mixing unit 450 to be described later. As a result, surplus gas not consumed in the engine 10 can be circulated and re-supplied to the fuel gas supply line 120 side. A fuel cooler 131 and a heat exchanger 432 are provided in the fuel gas return line 130 so that high-temperature excess gas recovered from the engine 10 can be cooled. The fuel cooler 131 may primarily cool the excess gas by heat-exchanging the excess gas recovered from the engine 10 with seawater, and the heat exchange unit 432 is primarily cooled by the fuel cooler 131. By exchanging heat between the gas and the relatively low-temperature liquid ammonia transported along the fuel gas supply line 120, cooling and re-liquefaction of the excess gas can be achieved.

Specifically, the heat exchange unit 432 is a fuel heater (excess gas primarily cooled via the fuel cooler 131 on the fuel gas return line 130 and liquid ammonia transported along the fuel gas supply line 120) 122) by exchanging heat with the low-temperature liquid ammonia before being heated, the surplus gas is cooled and re-liquefied and circulated to the gas mixing unit 450 to be described later, and the liquid ammonia is partially heated to the fuel heater 122 can be supplied. In this way, the relatively high-temperature surplus gas is cooled and re-liquefied by heat exchange with the relatively low-temperature liquid ammonia transported along the fuel gas supply line 120 without a separate cooling facility or re-liquefaction facility. It is possible to easily handle and utilize the gas flow through the 450, and at the same time reduce facility construction and operating costs.

The gas mixing unit 450 mixes the ammonia gas of the storage tank 110 extracted through the gas processing line 140 and the surplus gas circulated through the fuel gas return line 130 toward the fuel gas supply line 120 and prepared to join.

The ammonia gas delivered through the gas treatment line 140 and the surplus gas circulated through the fuel gas return line 130 are both pressurized and relatively high-temperature gaseous ammonia gas, whereas the fuel gas supply line 120 Liquid ammonia in a liquid state having a relatively low temperature introduced from the silver storage tank 110 is transported. Therefore, the gas mixing unit 450 stably mixes the gaseous ammonia gas and the liquid ammonia gas, and at the same time re-liquefies the gaseous ammonia gas and joins it to the fuel gas supply line 120, so that the engine 10 of fuel gas can be utilized.

The gas mixing unit 450 may include a recondenser 451 . The recondenser 451 may be provided at the front end of the boosting pump 121 on the fuel gas supply line 120, and the outlet side end of the gas processing line 140 and the outlet side end of the fuel gas return line 130 are Recondenser 451 may be connected. As a result, the liquid ammonia transported through the fuel gas supply line 120, the ammonia gas extracted and transported through the gas treatment line 140, and the surplus gas circulated through the fuel gas return line 130 are recondenser 451 ), the ammonia gas and surplus gas are mixed with the liquid ammonia inside the recondenser 451 so that cooling and re-liquefaction can be achieved.

On the other hand, the surplus gas circulated through the fuel gas return line 130 and introduced into the recondenser 451 is cooled while passing through the fuel cooler 131 and the heat exchanger 432, but some gas components may exist. . When such a gas component is introduced into a pump or the like, it may cause a decrease in output or failure of the pump, so it is necessary to select and supply a liquid component to the pump side. Accordingly, the recondenser 451 removes liquid ammonia introduced through the fuel gas supply line 120, ammonia gas introduced through the gas treatment line 140, and surplus gas circulated through the fuel gas return line 130. It is received and mixed and re-liquefied, but the liquid component may be separated and supplied to the boosting pump 121 side. The fuel gas supply line 120 is connected to the bottom side of the recondenser 451 so that the recondenser 451 separates and selects the liquid component of the ammonia component in the introduced gas-liquid mixture state and supplies it to the boosting pump 121 It may extend toward the boosting pump 121.

An injection line 260 may be provided to increase the ratio of the liquid component in the gas flow in the gas-liquid mixture state introduced into the recondenser 451 . The injection line 260 injects the liquid ammonia introduced into the fuel gas supply line 120 to the inside of the recondenser 451, thereby re-liquefying the gas component accommodated in the recondenser 451. To this end, the inlet end of the injection line 260 is branched from the fuel gas supply line 120, but branched from the front end of the recondenser 451 on the fuel gas supply line 120 to receive low-temperature liquid ammonia. The outlet side end may be disposed above the inside of the recondenser 451, but a plurality of injection nozzles for injecting liquid ammonia may be provided.

In this way, the ammonia gas generated and received inside the storage tank 110 by the static mixer 451 of the gas mixing unit 450 is mixed with liquid ammonia and re-liquefied to be used as fuel gas of the engine 10. . At the same time, surplus gas not consumed in the engine 10 may be mixed with liquid ammonia and re-liquefied by the recondenser 451 of the gas mixing unit 450 to be recycled as fuel gas of the engine 10 .

The ship's gas management system (100, 200, 300, 400) according to this embodiment having such a configuration stably removes gaseous ammonia gas, which is a concern in using ammonia as an energy source, without additional cooling or re-liquefaction facilities. Since it can be re-liquefied and treated, the efficiency of facility operation and structural stability of the facility can be improved. Furthermore, since the re-liquefaction efficiency of ammonia gas can be maximized in various hull operation situations, energy efficiency can be improved and the risk of safety accidents can be prevented.

100, 200, 300, 400: gas management system
110: storage tank 120: fuel gas supply line
121, 321: boosting pump 130: fuel gas return line
140: gas treatment line 141: compression unit
150, 250, 450: gas mixing unit 151: static mixer
251: mixing tank 321a: first boosting pump
321b: second boosting pump 432: heat exchange unit
451: recondenser

Claims (16)

A storage tank accommodating liquid ammonia and ammonia gas generated therefrom;
a fuel gas supply line having a boosting pump for pressurizing the liquid ammonia in the storage tank and supplying the liquid ammonia pressurized by the boosting pump as fuel gas to the engine;
a gas treatment line for extracting ammonia gas from the storage tank;
a fuel gas return line for circulating excess gas not consumed in the engine; and
A gas mixing unit mixing and joining at least one of the ammonia gas extracted by the gas treatment line and the surplus gas circulated by the fuel gas return line toward the fuel gas supply line,
The gas mixing unit
Including a static mixer provided at the front end of the boosting pump on the fuel gas supply line,
The static mixer and the mixing tank are sequentially provided, including a mixing tank provided at a rear end of the static mixer on the fuel gas supply line,
The gas mixing unit
A recondenser provided in front of the boosting pump on the fuel gas supply line,
An outlet of the gas treatment line and an outlet of the fuel gas return line are connected to the recondenser,
The fuel gas return line
A fuel cooler for primarily cooling the surplus gas;
A gas management system for a ship comprising a heat exchange unit for exchanging heat with ammonia on the fuel gas supply line for the surplus gas primarily cooled by the fuel cooler. delete delete delete According to claim 1,
An outlet of the gas treatment line is connected to the static mixer,
The outlet of the fuel gas return line is
A ship's gas management system connected to join the front end of the static mixer on the fuel gas supply line. According to claim 1,
An outlet of the gas treatment line is connected to the static mixer,
The outlet of the fuel gas return line is connected to the mixing tank of the ship's gas management system. delete According to claim 5 or 6,
The fuel gas return line
A fuel cooler for cooling the surplus gas;
A ship's gas management system including an expansion valve for reducing the surplus gas cooled by the fuel cooler. According to claim 8,
The fuel gas supply line
The ship's gas management system further comprising a fuel heater for heating the liquid ammonia pressurized by the boosting pump. delete According to claim 1,
The fuel gas supply line
Further comprising a fuel heater for heating the liquid ammonia pressurized by the boosting pump,
The heat exchange part
The ship's gas management system for heat-exchanging the surplus gas cooled by the fuel cooler with liquid ammonia at the front end of the fuel heater on the fuel gas supply line. According to claim 6,
The boosting pump
A first boosting pump provided between the static mixer and the mixing tank on the fuel gas supply line;
A ship's gas management system including a second boosting pump provided at the rear end of the mixing tank on the fuel gas supply line. According to claim 6 or 12,
The ship's gas management system further comprising an injection line for injecting the liquid ammonia introduced into the fuel gas supply line to the upper inside of the mixing tank. According to claim 1,
The ship's gas management system further comprises an injection line for injecting the liquid ammonia introduced into the fuel gas supply line to the upper inside of the recondenser. The method of any one of claims 1, 5 and 6,
The gas processing line
Ship's gas management system including a compression unit for pressurizing the ammonia gas in the storage tank. According to claim 15,
the compression unit
A compressor for compressing the ammonia gas in the storage tank;
A gas management system for a ship comprising a gas cooler for cooling the ammonia gas pressurized and heated by the compressor by heat exchange with seawater.

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