KR20240043004A - Ammonia treatment system and ship including the same - Google Patents

Abstract

In the ammonia treatment system according to an embodiment of the present invention, a storage tank that receives ammonia separated from a knockout drum in which exhaust gas discharged from the demand source is stored on a ship that uses ammonia as fuel at the demand source; a drain tank that discharges and stores water stored in the storage tank; a cooling pipe that lowers the temperature of the water below the water surface of the storage tank; and a recovery pipe for heating and recovering the water stored in the drain tank.

Description

Ammonia treatment system and ship including the same}

The present invention relates to an ammonia treatment system and a vessel incorporating the same.

In general, various engines installed on ships generate power by burning fossil fuels such as diesel oil, and exhaust gases generated during the combustion process of fossil fuels contain nitrogen oxides, sulfur oxides, carbon dioxide, etc.

Accordingly, LNG gas is used as an alternative fuel, or a dual fuel engine that generates driving force by mixing diesel oil and LNG gas is used. There is a problem of carbon dioxide emissions, and recently, as the demand for eco-friendly/high-efficiency engines has increased due to the strengthening of IMO environmental regulations, research on propulsion systems using various fuels is actively underway.

Accordingly, there is a demand for the development of eco-friendly ships that generate power using low-carbon or decarbonized fuels, and liquid ammonia, which does not emit carbon dioxide when burned, is emerging as one of the next-generation eco-friendly fuels.

Ammonia is attracting attention as an environmentally friendly fuel because it does not contain carbon. However, when ammonia is used as a fuel, its combustion reactivity is lower than that of other fuels, so the exhaust gas contains unburned ammonia (ammonia slip), and unburned ammonia is toxic. It is known as one of the substances and can be another cause of environmental pollution, so there is a problem that the amount that can be emitted into the atmosphere is limited.

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 safely store unburned ammonia, degas it when necessary, and provide ammonia treatment to discharge ammonia within the atmospheric emission limit. will be.

The ammonia treatment system according to an embodiment of the present invention includes a storage tank that receives ammonia separated from a knockout drum in which exhaust gas discharged from the consumer is stored in a ship that uses ammonia as fuel at the consumer; a drain tank that discharges and stores water stored in the storage tank; a cooling pipe that lowers the temperature of the water below the water surface of the storage tank; and a recovery pipe for heating and recovering the water stored in the drain tank.

Specifically, the storage tank receives the ammonia below the water surface, and the recovery pipe introduces the water through a pump and heats the water with a heater to degas the ammonia from the water into the drain tank. It may further include a vent unit that delivers the ammonia that is not dissolved in the water in the storage tank and the ammonia that is degassed in the drain tank to the outside.

Specifically, the storage tank is provided with a partition wall in the internal space, and the water is sequentially filled into the partition wall, and may further include a temperature sensor that measures the temperature of the water; and a PH sensor that measures the pH of the water. .

Specifically, the vent unit can discharge the ammonia to the outside only when the ammonia concentration is below the set value.

Specifically, in a ship that uses ammonia as fuel at a demand point, a storage tank that receives ammonia separated from a knockout drum in which exhaust gas discharged from the demand source is stored below the water surface; a drain tank storing the water discharged from the lower part of the storage tank; a cooling pipe that lowers the temperature of the water below the water surface of the storage tank; And it may include a heating pipe for degassing the ammonia from the water by increasing the temperature of the water below the water surface of the storage tank.

Specifically, the storage tank may be provided with a partition wall in the internal space so that the water is sequentially filled in the partition wall, and may further include a temperature sensor for measuring the temperature of the water and a PH sensor for measuring the pH of the water.

Specifically, the water flows along the partition wall of the storage tank and absorbs the ammonia, and the ammonia that is not absorbed may be discharged through the vent.

Specifically, a plurality of partition walls are provided and each has a different height, so that the path along which the ammonia delivered from the knockout drum moves to the vent unit can be long.

Specifically, the concentration of ammonia in the internal space may be formed differently for each space partitioned by the partition.

Specifically, a vessel including the ammonia treatment system may be included.

The ammonia treatment system according to the present invention can safely store ammonia and emit ammonia within the atmospheric emission limit, thereby preventing environmental pollution due to ammonia emissions.

Figure 1 is a diagram showing the configuration of a ship including an ammonia treatment system according to an embodiment of the present invention.
Figure 2 is a diagram schematically showing an ammonia treatment system according to an embodiment of the present invention.
Figure 3 is a diagram showing an ammonia treatment system according to a first embodiment of the present invention.
Figure 4 is a diagram showing an ammonia treatment system according to a second embodiment of the present invention.
Figure 5 is a diagram showing an ammonia treatment system according to a third embodiment of the present invention.
Figure 6 is a diagram showing an ammonia treatment system according to a fourth embodiment of the present invention.
Figure 7 is a diagram showing an ammonia treatment system according to a fifth embodiment of the present invention.

The objectives, 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 adding reference numbers to components in each drawing, it should be noted that identical components are given the same number as much as possible even if they are shown in different drawings. Additionally, in describing the present invention, if it is determined that a detailed description of related known technologies may unnecessarily obscure the gist of the present invention, the detailed description will be omitted.

Hereinafter, when a part is said to “include” a certain component, this means that it does not exclude other components but may further include other components, unless specifically stated to the contrary.

Hereinafter, “water” is a substance for absorbing ammonia, and can be interpreted to include detergents, absorbents, etc., and is not limited by the type, pH, phase, etc. of the substance.

In the present invention, ammonia can be replaced with other fuels. At this time, the fuel may include all types of substances that have relatively low boiling points and are water-soluble, such as methanol and ethanol.

Hereinafter, the present invention will be described in more detail for better understanding of the present invention.

1 is a diagram showing the configuration of a ship including an ammonia treatment system according to an embodiment of the present invention.

Referring to FIG. 1, a ship including an ammonia treatment system 1 may include a fuel storage unit 10, a fuel supply unit 20, a fuel supply valve 30, and a demand source 40.

The fuel storage unit 10 may be a facility provided in the ammonia treatment system 1 to store ammonia, and may include any type of facility, and the fuel storage unit 10 may be a tank-type storage facility. You can.

In this specification, it is clarified that a ship is a concept that encompasses marine structures that float at a certain point on the sea and perform specific tasks in addition to merchant ships that transport cargo from the origin to the destination.

The fuel supply unit 20 is connected to one or more fuel storage units 10 and is capable of heating ammonia to a temperature appropriate for supplying it to the demander 40 and supplying ammonia at a pressure appropriate for supplying it to the demander 40. It can be pressurized. For example, ammonia having a pressure of 50 to 70 bar and a temperature of 10 to 50 degrees can be supplied to the demand source 40. The fuel supply unit 20 may be a low-flashpoint fuel supply system (LFSS).

The fuel supply unit 20 consists of equipment such as a fuel heater 21, pump 22, return cooler 23, and knockout drum 60, and various valves and sensors for pressure control, flow control, vent, and nitrogen supply. It may additionally include a service tank, a nitrogen supply system, a glycol system, a gas-liquid separator, and a vent unit 80.

The fuel supply valve 30 is located between the fuel supply unit 20 and the consumer 40, and separates the fuel supply unit 20 and the consumer 40 when the fuel supply unit 20 operates abnormally in the fuel supply line L1. Thus, the fuel supply to the consumer 40 can be effectively blocked.

The fuel supply valve 30 may be comprised of valves, filters, and various sensors for purposes such as double blocking, discharge, vent, pressure control, and nitrogen supply. The fuel supply valve 30 is a mechanism in which control valves that control the supply of ammonia to the demand source 40 are centrally arranged, and may be a fuel valve train (FVT, Fuel Valve Train).

The demand source 40 may be an ammonia propulsion engine or an ammonia power generation engine. The consumer 40 is environmentally friendly because it can propel ships or produce electricity to be used on ships using ammonia, which does not emit carbon during the combustion process.

The fuel recovery line (L2) can connect the consumer (40) and the knockout drum (60), and the excess ammonia remaining unburned in the consumer (40) can be discharged to the knockout drum (60) through the fuel recovery line (L2). You can. This excess ammonia can have a pressure of 50 to 70 bar.

In addition, when the fuel supply valve 30 fails to operate normally, such as in an emergency stop of the demand source 40 or when the valves provided in the fuel supply valve 30 fail, a large amount of ammonia is discharged for a short period of time.

If all of the ammonia emitted at this time is discharged to the outside, environmental problems may occur, and the amount that can be discharged is limited, so it is not possible to discharge all of it, resulting in a waste of ammonia fuel. Therefore, a knockout drum 60 is needed to accommodate a large amount of ammonia discharged in a short period of time.

The knockout drum 60 can separate excess ammonia recovered from the demand source 40 into liquid ammonia (LA) and gaseous ammonia (GA). Liquid ammonia (LA) separated by the knockout drum 60 can be returned to the fuel supply line (L1). The fuel supply line (L1) may be provided with a return cooler (23) to cool liquid ammonia (LA). The knockout drum 60 can receive the exhaust gas discharged from the consumer 40 and separate gaseous ammonia (GA).

Gaseous ammonia (GA) separated by the knockout drum 60 can be delivered to the ammonia treatment system 1. The ammonia treatment system 1 can lower the concentration of gaseous ammonia (GA). Vent gas discharged from the ammonia treatment system 1 may be discharged to the outside through the vent unit 80.

In addition, although not shown in the drawing, a line connecting the knockout drum 60 and the fuel storage unit 10 may be provided, and ammonia can be transferred from the knockout drum 60 to the fuel storage unit 10 using the line. It can be delivered.

In this way, excess ammonia remaining uncombusted in the demand source 40 can be recovered, and liquid ammonia (LA) in a liquid state separated by the knockout drum 60 can be supplied back to the fuel supply line (L1).

Figure 2 is a diagram schematically showing an ammonia treatment system according to an embodiment of the present invention.

Referring to Figure 2, the gaseous ammonia (GA) or ammonia gas separated by the knockout drum 60 can be delivered to the storage tank 50 of the ammonia treatment system 1, and the ammonia gas is dissolved in water to form ammonia water. It can be.

Hereinafter, gaseous ammonia (GA) or ammonia gas separated by the knockout drum 60 is referred to as ammonia.

Ammonia water can be discharged to the drain tank 70, which will be explained later, and ammonia not dissolved in water can be discharged to the outside as vent gas through the vent unit 80.

The storage tank 50 has a simple structure in that it supplies ammonia to stored water, does not use power, and can handle ammonia even when the flow rate increases, such as when ammonia must be discharged urgently.

However, as the amount of ammonia dissolved in stored water increases, the absorption capacity of the storage tank 50 may decrease, and when ammonia is directly injected into water or delivered below the water surface, when the water level of the stored water rises, ammonia is released to a high level. May need to be supplied under pressure.

When ammonia is injected above the water surface, the amount of vent gas discharged to the outside through the vent unit 80 is greater than the amount dissolved in water, so the vent unit 80 may be closed to maintain the atmospheric emission limit. In the ammonia treatment system 1 according to one embodiment, water may flow along the partition wall 51 so that ammonia is well dissolved in water.

Figure 3 is a diagram showing an ammonia treatment system according to a first embodiment of the present invention.

Referring to Figure 3, the ammonia treatment system 1 according to the first embodiment of the present invention includes a storage tank 50, a cooling pipe 52, a recovery pipe 54, a drain tank 70, and a vent unit 80. ), a temperature sensor 56, a PH sensor 57, and a concentration sensor 58.

The storage tank 50 can receive exhaust gas discharged from the consumer 40 or ammonia (GA) separated from the knockout drum 60 where unused fuel is stored. Gaseous ammonia or liquid ammonia can be delivered, and can be delivered from above or below based on the water surface of water, absorbent, etc. stored in the storage tank 50.

Although not shown in FIG. 3, the storage tank 50 is a storage facility that stores water, absorbent, etc. above a certain level, and can create ammonia water by dissolving ammonia delivered from the knockout drum 60 in water, etc.

When there is a lot of ammonia dissolved in the storage tank 50 and the ammonia concentration in the water is high, it is difficult to additionally dissolve the ammonia delivered from the knockout drum 60, so the solubility is increased by lowering the temperature of the water through the cooling pipe 52. New water can be supplied from the supply pipe (59) while discharging water with a high ammonia concentration to the drain tank (70).

A partition wall 51 is provided in the internal space of the storage tank 50 to divide it into spaces, and the partition wall 51 according to the ammonia treatment system 1 according to the first embodiment may have a partially open shape. .

The partition wall 51 is at least partially open, so that even if the internal space of the storage tank 50 is partitioned by the partition wall 51, fluids can move between each partitioned space, allowing ammonia to enter the inside of the storage tank 50. Can move in space.

Referring to FIG. 3, a plurality of partition walls 51 may be provided to divide the internal space of the storage tank 50 into a plurality, and the partition wall 51 may be provided as a porous structure with holes throughout, allowing water and ammonia to be released. It can pass through the partition wall (51).

The storage tank 50 may be provided with a supply pipe 59 through which the stored water is supplied. The location of the supply pipe 59 and the location where the ammonia supplied from the knockout drum 60 are supplied may be provided differently. Therefore, the concentration of water in which ammonia is dissolved in a specific area may not be uniform, but if the water flows through the partition wall 51 and there is no additional supply of water and ammonia, the concentration may become uniform.

The water supplied to the storage tank 50 through the supply pipe 59 can move while sequentially filling the partition wall 51, and the water is not supplied all at once, but the porous structure of the partition wall 51 Since a certain amount is supplied, the effect of ammonia being continuously dissolved in a certain amount of water can be created.

The cooling pipe 52 may be provided below the water surface of the storage tank 50 and can lower the temperature of the water. The cooling pipe 52 is isolated from the water stored in the storage tank 50 through a separate circulation pipe and can exchange heat without direct mixing, and can use cooling water or sea water from the demand source 40.

Ammonia has a boiling point of -33°C, exists in a gaseous state at room temperature, and interacts with water through hydrogen bonding, making it highly soluble in water. Ammonia has a solubility of 400 g per 1 kg of water at 30°C, and as the temperature of water decreases, the solubility of ammonia increases. 900 g of ammonia is dissolved per kg of water at 0°C, so the solubility of ammonia can be increased by lowering the temperature of the water through the cooling pipe 52.

The cooling pipe 52 can increase the amount of ammonia dissolved per unit volume by lowering the temperature of the water stored in the storage tank 50, thereby efficiently storing ammonia. However, although the solubility of ammonia is high in water at 0°C, additional problems may occur if the water changes state to ice, so the water can be cooled to a temperature at which the water does not change state.

In order to uniformly lower the temperature of the water stored in the storage tank 50, the cooling pipe 52 must be provided below the water surface to correspond to the floor area of the storage tank 50, but the cooling pipe 52 must be long. If this happens, cooling efficiency may decrease.

In order to effectively lower the temperature of water and increase the solubility of ammonia, a cooling pipe 52 is provided at the location where ammonia is supplied from the knockout drum 60 to the storage tank 50, so that the ammonia can be dissolved in cooled water. there is.

The recovery pipe 54 can recover water stored in the drain tank 70, and may include a pump (not shown) for recovering water and a heater 55 for heating the recovered water. . The water stored in the drain tank 70 may have a high ammonia concentration, making it difficult to store additional ammonia by dissolving it, so the ammonia can be degassed through the recovery pipe 54.

The recovery pipe 54 allows water with a high ammonia concentration to flow in through a pump and heats it with the heater 55 to degas the ammonia. The degassed ammonia is delivered to the drain tank 70 or the vent unit 80. It may be discharged to the outside.

The drain tank 70 can be provided in a relatively smaller size than the storage tank 50, so there is a limit to the amount of degassed ammonia stored in the drain tank 70, so the recovery pipe 54 is connected to the vent portion 80. It can be operated additionally if ammonia degassed through can be discharged.

The heater 55 provided in the recovery pipe 54 can use a separate heat source or heat or steam from the demand source 40. As shown in FIG. 3, the heater 55 is provided separately in the drain tank 70 or the heater 55 can be used. It is disposed at the bottom of the drain tank 70 to raise the temperature of water with a high ammonia concentration, thereby lowering the solubility of ammonia in water to discharge ammonia.

The drain tank 70 can discharge and store water stored in the storage tank 50, and is connected to the storage tank 50. A pipe (not shown) may be provided connecting the drain tank 70 and the storage tank 50, and a valve (not shown) may be provided to control the amount of water discharged to the drain tank 70.

The drain tank 70 can lower the concentration of ammonia by supplying additional water to the water delivered from the storage tank 50, and recovers and heats the water stored in the drain tank 70 through the recovery pipe 54. Ammonia can be degassed.

The drain tank 70 can receive water when the concentration of ammonia dissolved in water in the storage tank 50 is high, and the concentration of ammonia in the storage tank 50 can be measured by the PH sensor 57. You can. The drain tank 70 stores water with a high ammonia concentration and can degas the ammonia through the recovery pipe 54 and discharge it to the outside through the vent unit 80.

The vent unit 80 can discharge ammonia that is not dissolved in water in the storage tank 50 and ammonia degassed in the drain tank 70 to the outside, so the vent unit 80 is connected to the storage tank 50 and the drain tank. It may be provided at the upper part of (70), respectively.

A concentration sensor 58 is provided in the vent unit 80 to measure the concentration of ammonia being discharged, and the opening and closing of the vent unit 80 can be adjusted to discharge ammonia within the atmospheric emission limit.

The vent unit 80 can discharge ammonia to the outside only when the ammonia concentration is below the set value, and the set value may be a value corresponding to the ammonia emission limit to the atmosphere. In a situation where ammonia cannot be discharged to the outside from the vent unit 80, it is difficult if ammonia is transferred from the storage tank 50 or the drain tank 70 to the vent unit 80, so the concentration of the vent unit 80 is detected. Depending on the value of the sensor 58, the operation of the cooling pipe 52 of the storage tank 50 and the recovery pipe 54 of the drain tank 70 may vary.

When the concentration of ammonia in the vent unit 80 is higher than the set value, ammonia cannot be discharged to the outside for a certain period of time. Therefore, in order to prevent additional production of ammonia, the cooling pipe 52 is operated in the storage tank 50 to cool the water. The solubility of ammonia can be increased by lowering the temperature, and the ammonia degassing process can be stopped by stopping the operation of the recovery pipe 54 in the drain tank 70.

The temperature sensor 56 is provided in each of the storage tank 50 and the drain tank 70 to measure the temperature of the water. It can be provided below the water surface, and in the storage tank 50, there are two cooling pipes 52, one on the opposite side and one on the other side without cooling pipes, so that the temperature of the water stored in the storage tank 50 can be measured.

The temperature sensor 56 can measure the temperature of the water stored in the drain tank 70, and the temperature of the drain tank 70 can also increase by heating the recovery pipe 54 provided in the drain tank 70. , when the temperature of the drain tank 70 measured through the temperature sensor 56 is high, the cooling pipe 52 operates to supply low-temperature water to the drain tank 70.

The PH sensor 57 can measure the PH of water, and like the temperature sensor 56, it can be provided in each of the storage tank 50 and the drain tank 70. When ammonia (NH3) is dissolved in water, it can be ionized to become ammonium ion (NH4+). At this time, hydrogen atoms are taken from water, so water can become weakly basic.

As the amount of ammonia dissolved in water increases, the basicity becomes stronger and the PH may increase. Therefore, the amount of ammonia dissolved in water can be inferred by measuring the PH of the water through the PH sensor 57.

Through the temperature sensor 56 and PH sensor 57, it is possible to determine whether more ammonia can be dissolved in water. If the ammonia concentration is high and more ammonia cannot be dissolved, the water in the storage tank 50 is discharged from the drain tank (70). ) and can dissolve ammonia by receiving new water from the supply pipe 59.

Figure 4 is a diagram showing an ammonia treatment system according to a second embodiment of the present invention.

Hereinafter, other embodiments of the present invention will be described focusing on differences from the previous embodiments, and parts where description is omitted will be replaced with the previous content.

In the ammonia treatment system 1 according to the second embodiment of the present invention, a heating pipe 53 may be provided in the storage tank 50 instead of the recovery pipe 54 provided in the drain tank 70 described above. .

Like the cooling pipe 52, the heating pipe 53 is isolated from the water stored in the storage tank 50 through a separate circulation pipe and can exchange heat without direct mixing, and is connected to the demand 40 or Steam from a boiler, etc. can be used.

A heating pipe 53 is provided in the storage tank 50, eliminating the need for a pump that introduced water from the recovery pipe 54, and the operation of the cooling pipe 52 and the heating pipe 53 in the storage tank 50. You can control the temperature of the water.

Since the temperature of the water is related to the solubility of ammonia, when a lot of ammonia is delivered from the knockout drum 60, the temperature of the water is lowered to dissolve the ammonia in the water, and if ammonia needs to be discharged, the heating pipe 53 is connected. As the temperature of the water increases during operation, the solubility of the water decreases and the ammonia discharged can be discharged through the vent unit 80.

Since ammonia is degassed from water by the operation of the heating pipe 53, the heating pipe 53 can be provided around the vent portion 80, and the partition wall 51 provided in the inner space of the storage tank 50 is Since the porous structure is provided so that water sequentially fills the partition wall 51, the cooling pipe 52 and the heating pipe 53 can be provided with the partition wall 51 in between.

In terms of the efficiency of the cooling pipe 52 and the heating pipe 53, cooling and heating of water can be made efficient when they are provided in different locations.

The cooling pipe 52 is provided around the location where ammonia is delivered from the knockout drum 60, and the heating pipe 53 may be provided on the other side of the cooling pipe 52 and around the vent portion 80. This can be seen by referring to Figure 4.

The water cooled through the cooling pipe 52 and the water heated through the heating pipe 53 are mixed by the partition wall 51 of the porous structure, but the water is filled in the storage tank 50 without the partition wall 51. Since it takes more time to move through the partition wall 51 than before, ammonia is dissolved in water on the side where the cooling pipe 52 is provided, and ammonia is degassed from water on the side where the heating pipe 53 is provided. Progress is possible.

When the concentration of ammonia exceeds the set value according to the concentration sensor 58 provided in the vent unit 80, the operation of the heating pipe 53 may be stopped.

Figure 5 is a diagram showing an ammonia treatment system according to a third embodiment of the present invention.

In the ammonia treatment system 1 according to the third embodiment of the present invention, the partition walls 51 are arranged to be spaced apart to form a partition space (not shown).

Water may be supplied to the space of the partition wall 51 through the supply pipe 59, and water may flow down along the partition wall 51. If the ammonia supplied through the knockout drum 60 is supplied below the water surface, the ammonia is immediately dissolved in water. If the ammonia is supplied above the water surface, it does not dissolve in the water but moves and then falls into the water in the space of the partition 51. It can be dissolved by

The water flowing down from the space of the partition 51 has a scrubbing effect and can dissolve ammonia that is not dissolved in water. Referring to FIG. 5, the ammonia delivered through the knockout drum 60 is dissolved in water at the front of the space of the partition 51, and a vent part 80 is provided at the rear of the space of the partition 51, so that the ammonia that is not dissolved in water is dissolved in water. Ammonia can be dissolved by water flowing into the space of the partition 51, and ammonia that has passed through the space of the partition 51 but has not been dissolved can be discharged to the outside through the vent unit 80.

When the concentration of ammonia exceeds the set value or is close to the set value according to the concentration sensor 58 provided in the vent part 80, ammonia flows down into the space of the partition wall 51 to increase the dissolution of ammonia in water. The amount of water can be increased.

In general, the gas can be dissolved with a spraying part that sprays water from the top of the gas, but the spraying part must be provided and must be long in the height direction, so installation costs are consumed.

The injection unit may be used to dissolve gas that passes through water but is not dissolved, so the efficiency may be low. On the other hand, the space of the partition 51 of the ammonia treatment system 1 according to the third embodiment of the present invention is located in the longitudinal direction. It is provided without the need for additional spray equipment, and can dissolve ammonia that passes through water but is not dissolved, or ammonia that does not pass through water, so the dissolution efficiency can be high.

While it may be difficult for the spray unit to spray water evenly throughout the entire internal space of the tank, the space in the partition wall 51 of the ammonia treatment system 1 according to the third embodiment of the present invention is provided perpendicular to the storage tank 50 and is located in the partition wall. (51) Any ammonia passing through the space can be allowed to pass through the water.

Figure 6 is a diagram showing an ammonia treatment system according to a fourth embodiment of the present invention.

A plurality of partition walls 51 are provided in the storage tank 50, and since the partition walls 51 are not provided with a porous structure, fluid may not pass through. The partition wall 51 may be disposed at the upper or lower part of the storage tank 50 to form a movement path for ammonia toward the vent unit 80.

Ammonia can be delivered from the storage tank 50 below or above the water surface, but regardless of the delivery location, the ammonia must pass through the water to be discharged into the vent unit 80. Even if ammonia is delivered from the storage tank 50 to the water surface, it must pass through the water provided between the partition walls 51, and since the heights of the partition walls 51 are different, the concentration and temperature of the ammonia provided between the partition walls 51 are different. It can pass through different waters several times.

Referring to FIG. 6, it can be seen that the height of the partition wall 51 is different and that the height of the partition wall 51 is high where the supply pipe 59 through which new water is supplied is placed. When the partition wall 51 around the vent unit 80 is set high, the amount of water passing through just before ammonia is discharged into the vent unit 80 is large, so a large amount of ammonia is dissolved in water and discharged through the vent unit 80. Since the amount of ammonia can be reduced, the vent unit 80 can discharge ammonia within the atmospheric emission limit.

Ammonia supplied from the knockout drum 60 forms a movement path toward the vent unit 80 depending on the position and height of the partition wall 51, and the movement path may repeat up and down movements. The movement path of ammonia may be longer than when the partition wall 51 of a porous structure is provided, and the concentration of ammonia in the space where the storage tank 50 is partitioned by the partition wall 51 may be formed differently for each space.

The height of the water in the space partitioned by the partition 51 may be different, and in order to balance the pressure, the height of the water surface on both sides of the partition wall 51 may be different.

For example, the space where ammonia is supplied from the knockout drum 60 corresponds to a space where the pressure is relatively high because ammonia is supplied, so the height of the water surface on the other side with the partition wall 51 in between can be provided higher. .

For example, the space where the vent part 80 is provided corresponds to a space where the pressure is relatively low because ammonia is discharged to the outside through the vent part 80, and the height of the water surface on the other side with the partition wall 51 in between may be provided lower, but the height of the water surface may vary depending on the water supplied through the supply pipe 59.

Figure 7 is a diagram showing an ammonia treatment system according to a fifth embodiment of the present invention.

The storage tank 50 is divided into a plurality of independent internal spaces, and each internal space includes a cooling pipe 52 and a heating pipe 53, and can receive ammonia from the knockout drum 60. .

In the storage tank 50, a plurality of internal spaces may each include a temperature sensor 56 and a PH sensor 57, and may be divided into a plurality of spaces in plan or height, forming a plurality of spaces side by side in plan, It may be divided into multiple layers.

In the plurality of internal spaces, the amount of ammonia delivered from the knockout drum 60 is different for each space, and the dissolution of ammonia in water or the degassing process through the heating pipe 53 may proceed differently, so that the amount of ammonia stored in the plurality of internal spaces is different. The concentration of ammonia in water and the state of ammonia may be different.

As for the plurality of internal spaces, only one space may be used as needed, and may be used sequentially depending on the amount of ammonia supplied.

Referring to Figure 7, it can be seen that the plurality of internal spaces are provided in two layers, and the ammonia supplied from the knockout drum 60, the vent part 80, and the drain tank 70 are all shown in the plurality of internal spaces. Although not included, each may include a plurality of internal spaces.

In general, the storage tank 50 may be provided with a partition wall 51, but the partition wall 51 is provided in a porous structure to allow fluid to flow, or even if the fluid does not flow through the partition wall 51, the storage tank 50 ), so that ammonia could flow throughout the entire internal space of the storage tank 50.

On the other hand, the plurality of internal spaces in the ammonia treatment system 1 according to the fifth embodiment of the present invention are provided as mutually closed spaces, so that dissolution and degassing of ammonia can be carried out for each space, and a plurality of internal spaces can be divided as necessary. It is efficient because it can be divided into sections.

Referring to FIG. 7, in a plurality of internal spaces provided on two floors, the floor (not shown) dividing the first and second floors is folded or overlapped as needed, making the first and second floors into one. It can be formed as an internal space.

If the floor is folded or overlapped to form one internal space of the storage tank 50, a large amount of water can be stored, and if it is divided into a plurality of internal spaces as needed, the floor is spread out to form a storage tank ( 50) can be divided into the first and second floors.

In the process of the storage tank 50 dissolving ammonia in water in one internal space, if a new internal space is needed, the floor is spread to divide the storage tank 50 into the first and second floors, and the second floor is divided into two floors. The corresponding part can be prepared as a new space where water is not stored.

When the floor is spread and the storage tank 50 is divided into two floors, fluid cannot move between the second floor and the first floor. However, since ammonia was previously dissolved in the water stored on the first floor, the storage tank 50 is divided into two floors. The space may function as a drain tank 70.

The present invention also includes a vessel comprising at least one of the ammonia treatment systems 1 according to an embodiment of the present invention.

The present invention is not limited to the embodiments described above, and of course may include a combination of the above embodiments or a combination of at least one of the above embodiments with known techniques as another embodiment.

Although the present invention has been described in detail through specific examples, this is for the purpose of specifically explaining the present invention, and the present invention is not limited thereto, and can be understood by those skilled in the art within the technical spirit of the present invention. It would be clear that modifications and improvements are possible.

All simple modifications or changes of the present invention fall within the scope of the present invention, and the specific scope of protection of the present invention will be made clear by the appended claims.

1: Ammonia treatment system 10: Fuel storage unit
20: fuel supply unit 21: fuel heater
22: Pump 23: Return cooler
30: fuel supply valve 40: demand source
50: storage tank 51: partition wall
52: cooling pipe 53: heating pipe
54: recovery pipe 55: heater
56: Temperature sensor 57: PH sensor
58: Concentration detection sensor 59: Supply pipe
60: knockout drum 70: drain tank
80: Vent GA: Gas ammonia
LA: Liquid ammonia L1: Fuel supply line
L2: Fuel recovery line

Claims (10)

For ships that use ammonia as fuel at the point of demand,
A storage tank that receives the ammonia separated from the knockout drum in which the exhaust gas discharged from the consumer is stored;
a drain tank that discharges and stores water stored in the storage tank;
a cooling pipe that lowers the temperature of the water below the water surface of the storage tank; and
An ammonia treatment system comprising: a recovery pipe for heating and recovering the water stored in the drain tank. According to claim 1,
The storage tank is,
The ammonia is delivered below the water surface,
The recovery pipe is,
Introducing the water through a pump and heating the water with a heater to degas the ammonia from the water and transfer it to the drain tank,
An ammonia treatment system further comprising a vent unit that discharges the ammonia insoluble in water from the storage tank and the ammonia degassed from the drain tank to the outside. According to claim 2,
The storage tank is,
A partition wall is provided in the internal space, and the water sequentially fills the partition wall,
An ammonia treatment system further comprising: a temperature sensor for measuring the temperature of the water; and a PH sensor for measuring the pH of the water. According to claim 3,
The vent part,
An ammonia treatment system that discharges the ammonia to the outside only when the concentration of the ammonia is below a set value. For ships that use ammonia as fuel at the point of demand,
A storage tank that receives the ammonia separated from the knockout drum in which the exhaust gas discharged from the consumer is stored below the water surface;
a drain tank storing the water discharged from the lower part of the storage tank;
a cooling pipe that lowers the temperature of the water below the water surface of the storage tank; and
An ammonia treatment system comprising a heating pipe for degassing the ammonia from the water by increasing the temperature of the water below the water surface of the storage tank. According to claim 5,
The storage tank is,
A partition wall is provided in the internal space, and the water sequentially fills the partition wall,
An ammonia treatment system further comprising: a temperature sensor for measuring the temperature of the water; and a PH sensor for measuring the pH of the water. According to claim 4 or 6,
An ammonia treatment system in which the water flows along the partition wall of the storage tank and absorbs the ammonia, and the ammonia that is not absorbed is discharged through the vent. According to claim 7,
The bulkhead is,
An ammonia treatment system in which a plurality of units are provided and each has a different height, thereby lengthening the path along which the ammonia delivered from the knockout drum moves to the vent unit. According to claim 8,
An ammonia treatment system in which the concentration of ammonia in the internal space is formed differently depending on the space partitioned by the partition wall. A vessel comprising the ammonia treatment system according to any one of claims 1 to 9.

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