KR20240010348A - Ammonia treatment method and vessel - Google Patents

Abstract

According to one embodiment of the present invention, an ammonia treatment method is provided.
The ammonia treatment method according to an embodiment of the present invention includes the steps of (A) supplying sodium salt directly or in an aqueous solution to the neutralization tank, (B) supplying carbon dioxide to the neutralization tank, and supplying ammonia to the neutralization tank. Step (C) is supplied directly or in an aqueous solution, but the ammonia can be neutralized by performing steps (A) and (B) first and then performing step (C).

Description

Ammonia treatment method and vessel {Ammonia treatment method and vessel}

The present invention relates to an ammonia treatment method and a ship, and more specifically, to an ammonia treatment method and a ship that can effectively neutralize basic waste ammonia or ammonia water produced by dissolving waste ammonia in water.

As air pollution due to pollutants contained in exhaust gases generated during the combustion process of fossil fuels increases, there is a demand for the development of eco-friendly ships that generate power using low-carbon or decarbonized fuels, and combustion as one of the next-generation eco-friendly fuels is required. Ammonia, which does not emit carbon dioxide and is easy to store due to its high liquefaction point, is emerging.

Ammonia is stored in a fuel tank in a liquid state and supplied to the combustion engine through piping when necessary. It passes through multiple pumps and multiple heat exchangers installed on the piping, and is set to the pressure and temperature conditions required by the combustion engine before being transferred to the combustion engine. is supplied to

Meanwhile, due to the structure of the ship, the distance between the fuel tank and the combustion engine is large, so liquid ammonia is transported by connecting multiple pipes with flanges. As liquid ammonia flows along the pipe, it may leak through cracks or flanges formed in the pipe, and after leaking, it is vaporized into ammonia. Additionally, while supplying liquid ammonia, fuel supply equipment such as pumps and heat exchangers may need to be repaired, or a situation may occur in which the combustion engine may be shut down. At this time, liquid ammonia filled in piping and fuel supply facilities must be quickly purged using an inert gas such as nitrogen, and during this process, gaseous ammonia may inevitably be exposed to the outside. Since ammonia is a toxic substance and does not spread easily, leaked liquid ammonia or ammonia was conventionally dissolved in water to lower its concentration and then released into the atmosphere. In addition, ammonia slip, which is unburned ammonia contained in the exhaust gas of a combustion engine, was also dissolved in water to lower its concentration and then discharged. The ammonia water produced by dissolving waste ammonia or ammonia slip in water not only has a high pH, but also contains ammonium and nitrogen that cause eutrophication of the marine world, causing environmental pollution when discharged into the sea, making it difficult to treat. .

Republic of Korea Patent Publication No. 10-2022-0034270 (2022.03.18.)

The technical problem to be achieved by the present invention is to provide an ammonia treatment method that can effectively neutralize basic waste ammonia or ammonia water produced by dissolving waste ammonia in water.

Another technical problem to be achieved by the present invention is to provide a ship that can effectively neutralize basic waste ammonia or ammonia water produced by dissolving waste ammonia in water.

The technical problems of the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the description below.

The ammonia treatment method according to an embodiment of the present invention for achieving the above technical problem includes the steps of (A) supplying sodium salt directly or in an aqueous solution to the neutralization tank, and (B) supplying carbon dioxide to the neutralization tank. , and a (C) step of supplying ammonia directly or in an aqueous solution to the neutralization tank, wherein the (A) step and the (B) step are performed first and the (C) step is performed to neutralize the ammonia. I order it.

In the ammonia treatment method, step (A) may be performed first to generate brine inside the neutralization tank, and then step (b) may be performed.

Step (B) can be performed until the brine becomes a saturated carbon dioxide solution.

In step (B), a saturated aqueous solution of carbon dioxide may be supplied to the neutralization tank.

The ammonia treatment method may further include a step (D) of promoting a precipitation reaction by cooling the inside of the neutralization tank after the step (C).

The step (C) is performed until the hydrogen ion concentration (pH) of the mixed water containing the sodium salt and the carbon dioxide inside the neutralization tank reaches within the standard pH range, and the ammonia is mixed into the mixed water. When the pH reaches the reference value, the supply of ammonia is stopped, and after the step (C), it may further include a step (E) of discharging the mixed water and precipitates mixed with the ammonia inside the neutralization tank. You can.

In the step (E), the ammonium or nitrogen concentration of the mixed water mixed with ammonia discharged out of the neutralization tank is measured, and if the concentration is higher than the standard concentration, diluted water can be mixed and discharged.

A ship according to an embodiment of the present invention for achieving the above other technical problems includes a hull, a storage tank installed inside the hull and storing ammonia, a neutralization tank installed inside the hull, and sodium in the neutralization tank. A sodium salt supply pipe that supplies salt directly or in an aqueous solution, a carbon dioxide supply pipe that supplies carbon dioxide to the neutralization tank, and a hydrogen ion concentration (pH) of the mixed water containing the sodium salt and the carbon dioxide inside the neutralization tank. It includes a pH sensor that measures the pH, and an ammonia supply pipe that supplies ammonia directly or in an aqueous solution to the neutralization tank, wherein the ammonia supply pipe supplies the ammonia to the neutralization tank according to the measured value of the pH sensor.

The carbon dioxide supply pipe can supply carbon dioxide until the mixed water becomes carbon dioxide-saturated brine.

The sodium salt supply pipe may supply seawater to the neutralization tank to supply at least a portion of the sodium salt.

The ship has a drain pipe for discharging the mixed water mixed with ammonia and precipitates inside the neutralization tank out of the hull, and a seawater supply pipe connected to the drain pipe to dilute the mixed water mixed with ammonia and the precipitates. More may be included.

According to the present invention, carbon dioxide and sodium salt are used as neutralizing agents to neutralize ammonia water formed by dissolving waste ammonia or ammonia slip in water, so there is no need to store strongly acidic neutralizing agents such as hydrochloric acid or sulfuric acid, which are difficult to handle, as in the past. Ammonia water can be neutralized while ensuring worker safety. In particular, exhaust gas discharged from combustion engines such as boilers fueled with hydrocarbons, which are easily available on ships, seawater, or salt water concentrated by dehydrating seawater can also be used as a neutralizer, reducing costs for purchasing and storing neutralizers. In addition, the tank used to store the neutralizer can be omitted or minimized, thereby increasing space utilization within the ship.

In addition, carbon dioxide is first mixed with seawater or salt water to lower the pH to acidic, and then mixed with ammonia water to adjust the target pH, thereby reducing the production of precipitates such as ammonia carbonate.

1 is a flowchart of an ammonia treatment method according to an embodiment of the present invention.
Figure 2 is a diagram showing the configuration of a ship according to an embodiment of the present invention.
Figures 3 to 5 are operational diagrams for explaining the operation of the ship.
Figure 6 is an operational diagram for explaining the operation of a ship according to another embodiment of the present invention.

The advantages and features of the present invention and methods for achieving them will become clear by referring to the embodiments described in detail below along with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below and may be implemented in various different forms. The present embodiments are merely provided to ensure that the disclosure of the present invention is complete and to be understood by those skilled in the art. It is provided to fully inform those who have the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

Hereinafter, with reference to FIGS. 1 to 5, an ammonia treatment method and a ship according to an embodiment of the present invention will be described in detail.

The ammonia treatment method and ship according to the present invention uses carbon dioxide and sodium salt as neutralizing agents to neutralize ammonia water formed by dissolving waste ammonia or ammonia slip in water, so as in the past, strong acids such as hydrochloric acid and sulfuric acid, which are difficult to handle, are used. Since there is no need to store a neutralizer, ammonia water can be neutralized while ensuring worker safety. In particular, exhaust gas discharged from combustion engines such as boilers fueled with hydrocarbons, which are easily available on ships, seawater, or salt water concentrated by dehydrating seawater can also be used as a neutralizer, reducing costs for purchasing and storing neutralizers. In addition, the tank used to store the neutralizer can be omitted or minimized, thereby increasing space utilization within the ship. In addition, carbon dioxide is first mixed with seawater or salt water to lower the pH to acidic, and then mixed with ammonia water to adjust the target pH, thereby reducing the production of precipitates such as ammonia carbonate.

Hereinafter, with reference to FIGS. 1 and 2, the ammonia treatment method and the ship 1 will be described in detail.

Figure 1 is a flowchart of an ammonia treatment method according to an embodiment of the present invention, and Figure 2 is a diagram showing the configuration of a ship according to an embodiment of the present invention.

For convenience of explanation, the ship 1 will be described first, and then the ammonia treatment method will be described later.

The ship (1) according to the present invention includes a hull (10), a storage tank (20), a neutralization tank (30), a sodium salt supply pipe (40), a carbon dioxide supply pipe (50), a pH sensor (60), and an ammonia supply pipe (70). ) includes.

The hull 10 forms the external shape of the ship 1, and its outer surface is formed in a streamlined shape to minimize resistance due to seawater. The hull 10 is propelled by power generated from the first combustion engine 21, which will be described later, and a storage tank 20 and a neutralization tank 30 are installed inside.

The storage tank 20 is a tank that stores ammonia, more specifically, liquid ammonia. For example, it may be formed as a membrane-type normal pressure tank in which the internal pressure is maintained constant. The storage tank 20 receives liquid ammonia from the refueling line 20a, and the refueling line 20a connects between the refueling terminal (not shown) and the storage tank 20 to supply liquid ammonia from the refueling terminal to the storage tank 20. Liquid ammonia can be supplied. The oil supply line 20a may be formed by connecting a plurality of pipes to a flange 20c, and a tray 20d containing dilution water is located at the bottom of each flange 20c to prevent leakage from the flange 20c. The dropped liquid ammonia can be dissolved in dilution water to form ammonia water. Liquid ammonia inside the storage tank 20 is supplied to the first combustion engine 21.

The first combustion engine 21 receives liquid ammonia and combusts it to generate power, and may be, for example, a main engine. The first combustion engine 21 receives fuel from the fuel supply pipe 20b, and the fuel supply pipe 20b connects the storage tank 20 and the first combustion engine 21 to store the liquid inside the storage tank 20. Ammonia can be supplied to the first combustion engine (21). The fuel supply pipe 20b may be formed by connecting a plurality of pipes to a flange 20c, and a tray 20d containing dilution water is located at the bottom of each flange 20c, which leaks into the flange 20c. The dropped liquid ammonia can be dissolved in dilution water to form ammonia water.

The neutralization tank 30 is a tank in which a neutralization reaction of ammonia or ammonia water occurs, and a sodium salt supply pipe 40, a carbon dioxide supply pipe 50, and an ammonia supply pipe 70 may be connected directly or indirectly to one side, respectively.

The sodium salt supply pipe 40 is a pipe that supplies sodium salt directly or in an aqueous solution to the neutralization tank 30. For example, sodium salts such as sodium chloride (NaCl) and sodium sulfate (Na ₂ SO ₄ ) are directly supplied to the neutralization tank. It can be supplied to (30), or an aqueous solution of sodium salt dissolved in water or salt water concentrated through a dehydration process can be supplied to the neutralization tank (30). Here, water is not limited to fresh water but can also refer to seawater, salt water, and demiwater that can dissolve sodium salts. Alternatively, the sodium salt supply pipe 40 may supply at least a portion of the sodium salt by supplying seawater supplied from outside the ship 10 to the neutralization tank 30 as is. If necessary, the sodium salt supply pipe 40 may supply sodium salt, seawater, and brine to the neutralization tank 30 at the same time. Hereinafter, the structure in which the sodium salt supply pipe 40 supplies sodium salt in an aqueous solution to the neutralization tank 30 will be described in more detail.

The sodium salt supply pipe 40 receives seawater from the seawater supply pipe 90, receives an aqueous sodium salt solution from a mixing tank (not shown) that mixes sodium salt and water, or concentrates seawater through a dehydration process to produce salt water. Salt water can be supplied from a salt water generating unit (not shown). The salt water generation unit is installed inside the hull 10 and may be a desalination facility that generates fresh water through reverse osmosis from sea water. The seawater flowing into the seawater supply pipe 90, the sodium salt aqueous solution generated in the mixing tank, and the brine generated in the salt water generating unit may each be discharged to the sodium salt supply pipe 40 and supplied to the neutralization tank 30. If necessary, the sodium salt supply pipe 40 may receive seawater from the seawater supply pipe 90 simultaneously or sequentially, and may receive sodium aqueous solution and brine from the mixing tank and the salt water generating unit, respectively.

The carbon dioxide supply pipe 50 is a pipe that supplies carbon dioxide to the neutralization tank 30, for example, exhaust gas discharged from a second combustion engine (not shown) such as a boiler using hydrocarbon fuel, pure carbon dioxide, or carbonate. Carbon dioxide can be supplied to the neutralization tank 30 in the form of an aqueous solution of an alkali or alkaline earth metal dissolved in water or a saturated aqueous solution of carbon dioxide. Here, water is not limited to fresh water, but can also refer to exhaust gas, pure carbon dioxide, seawater, salt water, and demiwater that can dissolve carbonate alkalis or alkaline earth metals. If necessary, the carbon dioxide supply pipe 50 may simultaneously or sequentially supply exhaust gas, pure carbon dioxide, and an aqueous solution of carbonate alkali or alkaline earth metal dissolved in water to the neutralization tank 30. When the carbon dioxide supply pipe 50 supplies carbon dioxide in a gaseous state, a spray nozzle is installed at the end of the pipe so that the carbon dioxide can be easily dissolved in ammonia water and sprayed into the neutralization tank 30 or into the solution filled in the neutralization tank 30. It can be sprayed inside. The carbon dioxide supply pipe 50 can acidify the mixed water containing sodium, more specifically, the sodium salt aqueous solution and carbon dioxide, by supplying carbon dioxide until the mixed water contains carbon dioxide-saturated brine.

When the sodium salt aqueous solution and carbon dioxide are supplied from the sodium salt supply pipe 40 and the carbon dioxide supply pipe 50, respectively, the pH sensor 60 measures the hydrogen ion concentration (pH) of the mixed water inside the neutralization tank 30 and controls the control unit ( 80), and the control unit 80 can control the opening and closing of the sodium salt supply pipe 40 and the carbon dioxide supply pipe 50 according to the measured value of the pH sensor 60. For example, the control unit 80 first opens the sodium salt supply pipe 40, fills the neutralization tank 30 with a certain amount of sodium salt aqueous solution, closes the sodium salt supply pipe 40, and opens the carbon dioxide supply pipe 50. If the pH value of the mixed water measured by the pH sensor 60 indicates acidity while mixing carbon dioxide, the carbon dioxide supply pipe 50 can be closed.

The ammonia supply pipe 70 is a pipe that supplies ammonia directly or in an aqueous solution to the neutralization tank 30. For example, when purging the purge line 20f for reasons such as shutdown of the first combustion engine 21, the pump, Waste ammonia vented to the vent line (20e) from a fuel supply facility (not shown) such as a heat exchanger, waste ammonia generated by vaporization of liquid ammonia leaking from the pipe or flange (20c), or waste ammonia contained in the exhaust gas. Ammonia slip, which is combustion ammonia, is supplied directly to the neutralization tank 30, or waste ammonia vented from the fuel supply facility to the vent line 20e when purging the purge line 20f, or waste ammonia leaked from the pipe or flange 20c. Ammonia water formed by dissolving in water or treated with ammonia slip can be supplied to the neutralization tank 30. Here, water is not limited to fresh water, but can collectively refer to seawater, salt water, and demiwater that can dissolve peammonia or ammonia slip. If necessary, the ammonia supply pipe 70 may supply waste ammonia and ammonia water to the neutralization tank 30 at the same time. Hereinafter, the structure in which the ammonia supply pipe 70 supplies ammonia water formed by dissolving waste ammonia in water or processing ammonia slip to the neutralization tank 30 will be described in more detail.

The ammonia supply pipe 70 receives ammonia water from the tray 20d formed in the lower part of the flange 20c of the fuel supply line 20a or the fuel supply pipe 20b, or the exhaust pipe (not shown) of the first combustion engine 21. Ammonia water can be supplied from the post-treatment unit 22 installed in ), or ammonia water can be supplied from the dissolution tank 23. The tray 20d is located below the flange 20c and contains dilution water, so liquid ammonia that leaks and falls into the flange 20c can be dissolved in the dilution water to form ammonia water. Since the post-treatment unit 22 brings the exhaust gas discharged from the first combustion engine 21 into gas-liquid contact with seawater or fresh water, ammonia slip contained in the exhaust gas can be dissolved in seawater or fresh water to form ammonia water. The dissolution tank 23 also contains dilution water to dilute the waste ammonia vented from the fuel supply facility to the vent line 20e, so that ammonia water can be formed. The ammonia water formed in the tray 20d, the ammonia water generated in the post-treatment unit 22, and the ammonia water generated in the dissolution tank 23 are each discharged to the ammonia supply pipe 40 and can be supplied to the neutralization tank 30. . If necessary, the ammonia supply pipe 40 may receive ammonia water from the tray 20d, the post-treatment unit 22, and the dissolution tank 23 simultaneously or sequentially and supply it to the neutralization tank 30.

When ammonia water is supplied from the ammonia supply pipe 70, the pH of the mixed water increases, and the control unit 80 can control the opening and closing of the ammonia supply pipe 70 according to the measured value of the pH sensor 60. For example, the control unit 80 opens the ammonia supply pipe 70 until the pH of the mixed water containing an aqueous sodium salt solution and carbon dioxide changes from acidic to neutral, and ammonia is mixed in the mixed water so that the pH reaches the reference value. Then, the ammonia supply pipe 70 can be closed to stop the supply of ammonia water.

Waste ammonia or ammonia water can undergo a neutralization reaction within the neutralization tank 30 according to <Reaction Formula 1> or <Reaction Formula 2> below.

<Scheme 1>

NH ₃ +CO ₂ + H ₂ O+ NaCl ↔ NaHCO ₃ + NH ₄ Cl

<Scheme 2>

Na ₂ SO ₄ + 2NH ₃ + 2H ₂ O + 2CO ₂ ↔ (NH ₄ ) ₂ SO ₄ + 2NaHCO ₃

The inside of the neutralization tank 30 can be cooled by the cooling unit 35, and the cooling unit 35 cools the inside of the neutralization tank 30 to a constant temperature, for example, about 20 to 22°C to carry out the neutralization reaction. can promote. Since the reaction between ammonia, carbon dioxide, and sodium salt is an equilibrium reaction, if the temperature is lowered, some of the products may precipitate as sodium bicarbonate (NaHCO ₃ ) and the forward reaction may continue to occur. More specifically, the temperature sensor 31 installed in the neutralization tank 30 measures the temperature of the inside of the neutralization tank 30 or the mixed water mixed with ammonia (hereinafter referred to as waste water solution) in real time and sends the temperature to the control unit 80. When transmitted, the control unit 80 can control the operation of the cooling unit 35 in response to the temperature value measured by the temperature sensor 31. The cooling unit 35 may be formed, for example, in the form of a heat exchange tube through which a refrigerant flows, and coolant, an external cooling cycle, liquid ammonia, etc. may be used as the refrigerant.

As described above, when the pH value of the waste water solution measured by the pH sensor 60 reaches the standard value, the control unit 80 closes the ammonia supply pipe 70 and removes the waste solution and precipitates in the neutralization tank 30 to the ship ( 10) The drain pipe 32 discharging to the outside can be opened. If necessary, the vent pipe 34 that releases ammonia in the neutralization tank 30 into the atmosphere can also be opened. A sensor unit 33 is installed on the drain pipe 32 to measure the ammonium or nitrogen concentration of the waste water solution, and on the drain pipe 32 in front of the sensor unit 33, sea water is supplied as dilution water to dilute the waste water solution and precipitates. Since the seawater supply pipe 90 is connected, if the ammonium or nitrogen concentration of the waste water solution measured by the sensor unit 33 is higher than the standard concentration, it can be diluted by mixing with seawater and then discharged.

The ammonia treatment method according to the present invention includes a step (A) of supplying sodium salt directly or in an aqueous solution to the neutralization tank 30, a step (B) of supplying carbon dioxide to the neutralization tank 30, and a neutralization tank ( 30) includes step (C) of supplying ammonia directly or in an aqueous solution, but steps (A) and (B) are performed first, and then step (C) is performed to neutralize the ammonia. More specifically, step (A) of supplying sodium salt directly or in an aqueous solution to the neutralization tank 30 is first performed to generate brine inside the neutralization tank 30, and then the brine inside the neutralization tank 30 is Step (B) can be performed by supplying carbon dioxide until the carbon dioxide becomes a saturated solution. In step (B), a saturated aqueous solution of carbon dioxide may be supplied to the neutralization tank 30. In the step (C) of supplying ammonia to the neutralization tank 30 directly or in an aqueous solution, the hydrogen ion concentration (pH) of the mixed water containing sodium salt and carbon dioxide inside the neutralization tank 30 changes from acidic to neutral. This is carried out until it reaches the standard pH range, and when ammonia is mixed in the mixing water and the pH reaches the standard value, the supply of ammonia can be stopped. After step (C), step (D) is performed to promote the precipitation reaction by cooling the inside of the neutralization tank 30, and after step (D), mixed water containing ammonia inside the neutralization tank 30 and Step (E) of discharging the precipitate can be performed. Step (E) includes measuring the ammonium or nitrogen concentration of the mixed water mixed with ammonia discharged out of the neutralization tank 30, and if the ammonium or nitrogen concentration is higher than the standard concentration, the diluted water is mixed and discharged, If the ammonium or nitrogen concentration is below the standard concentration, it can be discharged without mixing with dilution water.

Hereinafter, with reference to FIGS. 3 to 5, the operation of the ship 1 will be described in more detail.

Figures 3 to 5 are operational diagrams for explaining the operation of the ship.

The ammonia treatment method and ship according to the present invention uses carbon dioxide and sodium salt as neutralizing agents to neutralize ammonia water formed by dissolving waste ammonia or ammonia slip in water, so as in the past, strong acids such as hydrochloric acid and sulfuric acid, which are difficult to handle, are used. Since there is no need to store a neutralizer, ammonia water can be neutralized while ensuring worker safety. In particular, exhaust gas discharged from combustion engines such as boilers fueled with hydrocarbons, which are easily available on ships (1), seawater, or salt water concentrated by dehydrating seawater can also be used as a neutralizer, so it is necessary to purchase and store the neutralizer. Not only can costs be reduced, but the tank used to store neutralizers can be omitted or minimized, thereby increasing space utilization within the ship. In addition, carbon dioxide is first mixed with seawater or salt water to lower the pH to acidic, and then mixed with ammonia water to adjust the target pH, thereby reducing the production of precipitates such as ammonia carbonate.

First, referring to FIG. 3, the sodium salt supply pipe 40 is an aqueous solution of sodium salt dissolved in water, salt water concentrated through a dehydration process, or sea water supplied from outside the hull 10 in the neutralization tank 30. When the neutralization tank 30 is filled with a certain amount of sodium salt aqueous solution, brine or seawater, the control unit 80 closes the sodium salt supply pipe 40 and opens the carbon dioxide supply pipe 50. The carbon dioxide supply pipe 50 is supplied with exhaust gas discharged from a second combustion engine fueled by hydrocarbons or pure carbon dioxide or an aqueous solution of carbonate alkali or alkaline earth metal dissolved in water until the sodium salt aqueous solution, brine, or seawater becomes a carbon dioxide saturated solution. Alternatively, carbon dioxide is supplied to the neutralization tank (30) in the form of a saturated carbon dioxide aqueous solution. As carbon dioxide is supplied, the pH of the mixed water containing sodium salt and carbon dioxide decreases, and the pH sensor 60 measures the pH of the mixed water in real time and transmits it to the control unit 80.

If the value measured by the pH sensor 60 indicates acidity, the control unit 80 may close the carbon dioxide supply pipe 50 and open the ammonia supply pipe 70, as shown in FIG. 4. The ammonia supply pipe 70 supplies ammonia water formed by dissolving waste ammonia in water or processing ammonia slip contained in the exhaust gas of the first combustion engine 21 to the neutralization tank 30, simultaneously or sequentially. , the cooling unit 35 cools the inside of the neutralization tank 30 to a constant temperature to promote the neutralization reaction. The control unit 80 may control the operation of the cooling unit 35 in response to the temperature value measured by the temperature sensor 31.

When the pH of the mixed water containing ammonia measured by the pH sensor 60, that is, the pH of the waste water solution, reaches the reference value, the control unit 80 closes the ammonia supply pipe 70 and drains the water pipe (70), as shown in FIG. 5. 32) and the vent pipe 34 can be opened. The sensor unit 33 measures the ammonium or nitrogen concentration of the waste water solution discharged from the neutralization tank 30 to the drain pipe 32 and transmits it to the control unit 80, and the control unit 80 measures the measured value of the sensor unit 33. In response, seawater can be supplied from the seawater supply pipe 90, mixed with the wastewater solution, diluted, and then discharged.

Hereinafter, with reference to FIG. 6, the ship 1-1 according to another embodiment of the present invention will be described in detail.

Figure 6 is an operational diagram for explaining the operation of a ship according to another embodiment of the present invention.

The ship 1-1 according to another embodiment of the present invention further includes a premixing tank 100 for premixing sodium salt and carbon dioxide. The ship 1-1 according to another embodiment of the present invention is substantially the same as the above-described embodiment, except that it further includes a premixing tank 100 for premixing sodium salt and carbon dioxide. Therefore, this will be mainly explained, but unless otherwise stated, the description of the remaining components will be replaced by the above-mentioned details.

The premix tank 100 is formed between the carbon dioxide supply pipe 50 and the neutralization tank 30, and is also connected to the sodium salt supply pipe 40 to provide a second combustion engine using sodium salt aqueous solution, seawater, or brine, and hydrocarbon as fuel. The exhaust gas discharged from , pure carbon dioxide, an aqueous solution of carbonate alkali or alkaline earth metal dissolved in water, or a saturated aqueous solution of carbon dioxide can be mixed in advance. The sodium salt supply pipe 40 is opened before the carbon dioxide supply pipe 50 to supply sodium salt aqueous solution, seawater, or brine to the premix tank 100. When a certain amount of sodium salt aqueous solution, seawater, or brine is filled, the sodium salt supply pipe (40) may be closed and the carbon dioxide supply pipe (50) may be opened. A concentration sensor 110 is installed in the premix tank 100 to measure the carbon dioxide concentration of the mixed water containing sodium salt and carbon dioxide, and the control unit 80 measures carbon dioxide in response to the concentration value measured by the concentration sensor 110. The opening and closing of the supply pipe 50 can be adjusted. When the carbon dioxide concentration of the mixed water measured by the concentration sensor 110 reaches an appropriate value, the control unit 80 closes the carbon dioxide supply pipe 50 and then supplies the mixed water in the premix tank 100 to the neutralization tank 30. You can.

The premix tank 100 may be connected to a circulation line 120 on one side. The circulation line 120 sucks the gas filled inside the premix tank 100, more specifically, exhaust gas or pure carbon dioxide, and supplies it to the mixed water contained inside the premix tank 100. ) The upper part and the carbon dioxide supply pipe (50) can be connected to each other. That is, the exhaust gas or pure carbon dioxide inside the premix tank 100 is discharged to the circulation line 120 and circulated back to the premix tank 100 through the carbon dioxide supply pipe 50. A blower 130 is installed on the circulation line 120 to help the flow of exhaust gas or pure carbon dioxide, and the control unit 80 controls the circulation line ( The opening and closing of 120) can be adjusted and the operation of the blower 130 can be controlled. A vent line (not shown) that exhausts exhaust gas or carbon dioxide is branched from the circulation line 120 in front of the blower 130, and the control unit 80 can also control the opening and closing of the vent line.

Although embodiments of the present invention have been described above with reference to the attached drawings, those skilled in the art will understand that the present invention can be implemented in other specific forms without changing its technical idea or essential features. You will be able to understand it. Therefore, the embodiments described above should be understood in all respects as illustrative and not restrictive.

1: 1-1: Ship
10: hull 20: storage tank
20a: Oil supply line 20b: Fuel supply pipe
20c: Flange 20d: Tray
20e: vent line 20f: purge line
21: first combustion engine 22: post-processing unit
23: dissolution tank 30: neutralization tank
31: temperature sensor 32: drain pipe
33: sensor unit 34: vent pipe
35: Cooling unit 40: Sodium salt supply pipe
50: carbon dioxide supply pipe 60: pH sensor
70: Ammonia supply pipe 80: Control unit
90: Seawater supply pipe 100: Premix tank
110: Concentration sensor 120: Circulation line
130: blower 140: pressure sensor

Claims (11)

Step (A) of supplying sodium salt directly or in an aqueous solution to the neutralization tank;
(B) supplying carbon dioxide to the neutralization tank, and
Including step (C) of supplying ammonia directly or in an aqueous solution to the neutralization tank,
An ammonia treatment method in which steps (A) and (B) are first performed, and then (C) is performed to neutralize the ammonia. According to claim 1,
An ammonia treatment method in which step (A) is first performed to generate brine inside the neutralization tank, and then step (b) is performed. According to clause 2,
The step (B) is an ammonia treatment method performed until the brine becomes a saturated carbon dioxide solution. According to clause 2,
In step (B),
Ammonia treatment method of supplying a saturated aqueous solution of carbon dioxide to the neutralization tank. The method of claim 1, wherein after step (C),
Ammonia treatment method further comprising the step (D) of cooling the inside of the neutralization tank to promote a precipitation reaction. The method of claim 1, wherein step (C) is,
This is carried out until the hydrogen ion concentration (pH) of the mixed water containing the sodium salt and the carbon dioxide inside the neutralization tank reaches within the standard pH range, and when the ammonia is mixed in the mixed water and the pH reaches the standard value. , stopping the supply of said ammonia,
After the step (C), the ammonia treatment method further includes the step (E) of discharging the mixed water and precipitates containing the ammonia inside the neutralization tank. The method of claim 6, wherein step (E) is,
An ammonia treatment method in which the ammonium or nitrogen concentration of the mixed water mixed with ammonia discharged from the neutralization tank is measured and, if the concentration is higher than the standard concentration, mixed with diluted water and discharged. hull;
A storage tank installed inside the hull and storing ammonia;
A neutralization tank installed inside the hull;
A sodium salt supply pipe that supplies sodium salt directly or in an aqueous solution to the neutralization tank;
A carbon dioxide supply pipe supplying carbon dioxide to the neutralization tank;
A pH sensor that measures the hydrogen ion concentration (pH) of the mixed water containing the sodium salt and the carbon dioxide inside the neutralization tank, and
Includes an ammonia supply pipe that supplies ammonia directly or in an aqueous solution to the neutralization tank,
The ammonia supply pipe supplies the ammonia to the neutralization tank according to the measured value of the pH sensor. According to clause 8,
The carbon dioxide supply pipe supplies carbon dioxide until the mixed water becomes carbon dioxide-saturated salt water. According to clause 8,
The sodium salt supply pipe supplies seawater to the neutralization tank to supply at least a portion of the sodium salt. According to clause 8,
a drain pipe for discharging the mixed water and precipitates containing the ammonia inside the neutralization tank to the outside of the hull;
A vessel further comprising a seawater supply pipe connected to the drain pipe to dilute the mixed water containing the ammonia and the precipitate.

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