KR20130115504A - Vessel and control method thereof - Google Patents

Abstract

PURPOSE: A vessel and a control method thereof are provided to improve space utilization by reducing the size of a urea storage tank. CONSTITUTION: A vessel (1) comprises a storage tank (10), a pulverizing unit (40), a clean water producing unit (20), a mixing tank (30), a selective catalytic reactor (SCR) (90), and a jetting unit (70). The storage tank stores solid urea (11) therein. The pulverizing unit pulverizes the stored solid urea. The mixing tank mixes the pulverized urea with clean water produced from the clean water producing unit to produce urea water. The SCR decomposes nitrogen oxide contained in exhaust gas discharged from an engine. The jetting de jets the urea water to the exhaust gas discharged from the engine. [Reference numerals] (10) Storage tank; (20) Clean water producing unit; (30) Mixing tank; (70) Jetting unit; (80) Control unit; (AA) Engine

Description

Vessel and control method

The present invention relates to a ship and a control method of the ship.

As interest in environmental pollution has increased, there has been a movement in the ship sector to regulate the emission of environmental pollutants. In particular, in relation to the exhaust gas, the regulation on the emission of ship's exhaust gas (TIER III) has been in effect. To satisfy this, the nitrogen oxides contained in the exhaust gas must be removed.

Various methods are used to remove nitrogen oxides contained in the exhaust gas. In the ship field, a selective catalytic reactor (SCR) using urea water is mainly used.

Specifically, urea water is loaded on the vessel in a manner that is stored in a predetermined storage tank provided on the vessel, urea water is injected in an appropriate amount to the exhaust gas supplied to the SCR, whereby the nitrogen oxide contained in the exhaust gas is SCR It can be decomposed by reacting with a catalyst provided therein.

However, the above-described conventional techniques have the following problems.

Considering that the urea number required for a ship has a urea concentration of about 30 to 45%, the urea water storage tank to be installed on the ship should have a large capacity, which not only reduces the space utilization of the hull but also increases the weight of the hull. there is a problem.

In order to solve such a problem, a technology such as Korean Patent Laid-Open Publication No. 10-2010-0132310 has been proposed, but there is a problem that it is difficult to supply sufficient urea water only with moisture contained in the exhaust gas.

Patent Publication No. 10-2010-0132310

Embodiments of the present invention, to increase the space utilization inside the hull, to provide a ship and a control method of the ship that can reduce the weight of the hull.

In addition, an object of the present invention is to provide a vessel and a vessel control method capable of actively adjusting the amount of urea supplied according to the amount of nitrogen oxide contained in the exhaust gas.

In addition, it is intended to provide a ship and a control method of the ship that can be sufficiently decomposed even when a large amount of nitrogen oxide is discharged.

According to one aspect of the invention, the storage tank is stored solid urea; A crusher for pulverizing the solid urea stored in the storage tank; Fresh water production apparatus for producing fresh water; A mixing tank for preparing urea water by mixing the fresh water provided by the fresh water production device and the urea ground in the crusher; An SCR for decomposing nitrogen oxide contained in exhaust gas discharged from an engine; And an injector for injecting urea water supplied from the mixing tank to exhaust gas discharged from the engine.

In addition, the fresh water production apparatus is at least a fresh water production apparatus for producing drinking water, the fresh water supplied to the mixing tank may provide a vessel characterized in that the fresh water is not mixed with minerals.

In addition, it may provide a vessel further comprising a fresh water supply line for bypassing the mixing tank for the fresh water produced in the fresh water manufacturing device to supply to the injection device.

In addition, the ship may further include a urea water return line for returning the urea water discharged from the mixing tank to the mixing tank.

In addition, the pulverizer may provide a vessel, characterized in that it is provided integrally with the storage tank.

In addition, a first sensor disposed in front of the SCR, for measuring the amount of nitrogen oxide contained in the exhaust gas flowing into the SCR; A second sensor disposed at a rear end of the SCR and measuring an amount of nitrogen oxide included in exhaust gas discharged from the SCR; And a controller configured to adjust an amount of urea supplied to the SCR, based on at least one measured value of the first sensor and the second sensor.

The control unit may adjust the amount of urea supplied to the SCR by adjusting at least one or more of the concentration of urea water supplied to the injector and the amount of urea water supplied to the injector. Can be provided.

In addition, the position detection device for determining the position of the ship; And a controller for controlling only fresh water to be supplied to the mixing tank or the injector according to the position of the vessel identified by the position sensing device.

In addition, the control unit, when only the fresh water is supplied to the injector, it may provide a vessel characterized in that the fresh water supplied from the fresh water manufacturing apparatus bypasses the mixing tank to supply to the injector.

According to another aspect of the present invention, a control method of a ship comprising an SCR, comprising the steps of: measuring the amount of nitrogen oxide contained in the exhaust gas at least one or more of the front end and the rear end of the SCR; Determining whether a change is necessary in the amount of urea supplied for the SCR; And adjusting the amount of urea water and the supply amount of urea water by adjusting the amount of urea water and the amount of fresh water supplied from the fresh water manufacturing apparatus, if a change in the amount of urea supply is necessary. A control method can be provided.

In addition, the information on which one of the concentration of the urea water and the supply amount of the urea water to be adjusted may be provided in the memory control method, characterized in that stored in the memory.

In addition, the control method of the ship, characterized in that the control of the concentration of the urea water and the supply amount of the urea water is determined based on the measurement results of the front end and the rear end of the previously measured SCR.

In addition, determining the position of the vessel; And supplying fresh water only to a mixing tank for adjusting solid urea and fresh water and an injector for injecting urea water into exhaust gas according to the identified position of the ship.

In addition, when only fresh water is supplied to the injector, the injector may provide a control method of a ship, characterized in that the fresh water supplied from the fresh water producing apparatus for producing fresh water is supplied bypassing the mixing tank. have.

According to the embodiments of the present invention, since the size of the urea storage tank can be reduced compared to the conventional by loading the urea in a solid state vessel, it is possible to increase the space utilization inside the vessel.

In addition, by loading the urea in the ship in a solid state, it is possible to reduce the weight of the hull compared with the conventional storage of urea water.

In addition, by adjusting the concentration or the supply amount of the prepared urea water to actively adjust the supply amount of urea in accordance with the amount of nitrogen oxide, it is possible to efficiently remove the nitrogen oxides.

In addition, since the urea water can be manufactured by using a fresh water manufacturing apparatus mounted on the ship, it can be economically produced urea water.

In addition, since the amount of water for preparing urea water can be adjusted as needed, even if a large amount of nitrogen oxides are discharged, a sufficient amount of urea water can be provided.

1 is a view schematically showing the configuration of a ship according to an embodiment of the present invention.
2 is a flow chart showing a control method of a ship according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

In the following description of the present invention, detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

1 is a view schematically showing the configuration of a ship according to an embodiment of the present invention.

Referring to Figure 1, the vessel 1 according to an embodiment of the present invention is a storage tank 10 for storing a solid urea 11, a fresh water producing apparatus 20 for producing fresh water, a storage tank 10 and fresh water Mixing tank 30 for producing urea water by mixing urea and fresh water supplied from the manufacturing apparatus 20, Selective Catalystic Reactor 90 including a catalyst layer for decomposing nitrogen oxides, and exhaust gas generated in an engine. It may include an injection device 70 for injecting urea water supplied from the mixing tank 30.

The storage tank 10 may store the solid urea 11 solidified to a predetermined size. Since the storage volume of the solid urea 11 is smaller than that of storing the urea water, the size of the storage tank 10 can be reduced compared to the conventional bar, and the space utilization inside the hull can be increased.

The solid urea 11 stored in the storage tank 10 may be supplied to the grinder 40 and ground to a powder size. For example, the pulverizer 40 may crush the solid urea 11 into particles of several millimeters to several micrometers, and modify the particle size according to the amount of exhaust gas, the amount of nitrogen oxide, and the temperature of the system. It may also be ground. To this end, the grinder 40 may be provided with a drill tip of various sizes and a drive for replacing the drill tip.

In addition, the grinder 40 is formed integrally with the storage tank 10, may be mounted to the outlet of the storage tank 10, it may be configured separately from the storage tank (10).

The urea pulverized in the grinder 40 is supplied to the mixing tank 30 and mixed with the fresh water supplied from the fresh water manufacturing apparatus 20.

The fresh water producing apparatus 20 supplies fresh water to the mixing tank 30. The fresh water producing apparatus 20 may use a fresh water producing apparatus that is pre-equipped in the ship to supply fresh water to the living quarters or other living areas. In this case, in general, the fresh water produced by the fresh water manufacturing apparatus in the vessel contains very low ions, and when used as drinking water, minerals are added. In this embodiment, the water required to make urea water preferably contains low ions. Fresh water before supplying minerals may be supplied to the mixing tank 30.

A fresh water supply valve 801 may be provided between the fresh water manufacturing apparatus 20 and the mixing tank 30 to adjust the fresh water supply amount to the mixing tank 30.

In addition, the amount of crushed urea supplied from the storage tank 10 to the mixing tank 30 can be adjusted by controlling the load of the crusher 40.

The mixing tank 30 mixes urea supplied from the storage tank 10 and fresh water supplied from the fresh water manufacturing apparatus 20 to produce urea water. The mixing tank 30 may include an agitator or an ultrasonic sonicator, and may be used to prepare urea water by dissolving solid urea in fresh water.

In addition, the mixing tank 30 may serve as a buffer tank for storing the urea water after sufficiently preparing the urea water in consideration of the size of the ship, space utilization, exhaust gas emission, and the like. For example, the mixing tank 30 can be adjusted so that a certain amount or more of urea water is always present, and can be supplied if a large amount of urea water is required.

In addition, the mixing tank 30 may include a heater for producing a high concentration of urea water by increasing the solubility of the urea.

The urea water produced in the mixing tank 30 is injected into the exhaust gas moving from the engine to the SCR 90 through the injector 70. In this case, urea water concentration sensors 83 and 84 for measuring the concentration of urea water may be disposed at the rear end of the mixing tank 30.

The arrangement of the urea water concentration sensors 83 and 84 shown in FIG. 1 is merely an example, and the sensors may be variously disposed within the scope of the spirit of the present invention. For example, a sensor may be further attached to the mixing tank 30 or the injector 70 to measure the amount or concentration of urea water remaining in the mixing tank 30 or the injector 70, and the measured value may be controlled. It could be used for.

In addition, the urea water supply line between the mixing tank 30 and the injector 70 may be connected to the urea water return line 50 and the fresh water supply line 60 to adjust the concentration and flow rate of the urea water, urea Flow control valves 803 and 804 may be provided at connection points of the water supply line and the urea water return line 50 and connection points of the fresh water supply line 60, respectively.

Specifically, when the amount of nitrogen oxide contained in the exhaust gas of the engine is reduced, the urea water return line 50 mixes a part of the urea water supplied from the mixing tank 30 to the injection device 70. By returning to, the total amount of urea supplied to the SCR 90 can be reduced.

In addition, the fresh water supply line 60, if the concentration of the urea supplied to the SCR (90) is higher than the required value, the fresh water produced in the fresh water manufacturing apparatus 20 to the urea water to move directly to the injection device 70 By supplying, the concentration of urea water can be reduced.

Meanwhile, the flow control valves 803 and 804 control the use of the urea water return line 50 and the fresh water supply line 60, and also control the flow rate of the urea water supplied to the injection device 70. Can have To this end, the three-way valve may be provided as the flow control valves 803 and 804.

The exhaust gas generated from the engine is mixed with the urea water injected from the injector 70 and supplied to the SCR 90.

The SCR 90 is provided with a catalyst layer (not shown) necessary for the decomposition reaction of nitrogen oxides, which passes through the SCR 90 and reacts with urea to decompose.

The first sensor 81 and the second sensor 82 for measuring the amount of nitrogen oxide contained in the exhaust gas may be disposed at the front and rear ends of the SCR (90). The first sensor 81 is disposed in front of the SCR 90 to measure the amount of nitrogen oxide contained in the exhaust gas supplied to the SCR 90, and the second sensor 82 is located at the rear end of the SCR 90. It is arranged to measure the amount of nitrogen oxide contained in the exhaust gas discharged from the SCR (90).

Meanwhile, a bypass valve 805 may be provided between the engine and the injector 70 so that the exhaust gas may be immediately discharged without passing through the SCR 90. The bypass valve 805 may be controlled so that the exhaust gas may be discharged directly without passing through the SCR 90 in an area where there is no environmental regulation for nitrogen oxide.

In addition, the ship 1 according to the embodiment of the present invention may include a control unit 80 for controlling the above components. The controller 80 may control the amount of urea supplied to the SCR 90 based on at least one measured value of the first sensor 81 and the second sensor 82. Detailed information related to this will be described later.

In addition, the ship 1 according to an embodiment of the present invention may further include a position sensing device (not shown) such as a GPS for determining the position of the ship 1. The controller 80 may determine whether the vessel 1 operates within the exhaust gas restriction region based on the information obtained from the position sensing apparatus.

Hereinafter will be described the operation of the ship 1 according to an embodiment of the present invention having the configuration as described above.

The exhaust gas discharged from the engine is mixed with the urea water supplied from the injector 70 and passes through the SCR 90. Nitrogen oxide contained in the exhaust gas passes through the SCR 90 and may be decomposed by reacting with urea.

Urea is stored in the storage tank 10 as a solid urea 11 in the vessel (1), is pulverized in the grinder 40 and mixed with fresh water in the mixing tank 30 to become urea water. The fresh water supplied to the mixing tank 30 may be a fresh water manufacturing apparatus 20 previously installed in the vessel 1 for drinking water.

As such, since the urea is loaded on the vessel 1 in the solid form 11, the storage tank 10 can be greatly reduced.

In addition, since the fresh water manufacturing apparatus 20 conventionally used for the vessel 1 is used for the production of urea water, since an additional configuration for supplying water is not necessary, a vessel capable of operating the SCR 90 is low. Can be produced at cost.

On the other hand, the first sensor 81 and the second sensor 82 measures the amount of nitrogen oxide before and after passing through the SCR 90 and transmits it to the controller 80.

The controller 80 controls the amount of urea supplied to the SCR 90 based on information received from at least one of the first sensor 81 and the second sensor 82.

For example, if the amount of nitrogen oxide contained in the exhaust gas is large, a large amount of urea is required to decompose it, and if the amount of nitrogen oxide is small, a small amount of urea is required to decompose it. The amount of urea supplied to the SCR 90 may be adjusted by i) adjusting the supply amount of urea water when urea water is supplied at a constant concentration, or ii) adjusting the concentration of urea water when urea water is supplied at a constant amount.

Specifically, when the amount of nitrogen oxide detected by the first sensor 81 increases, the controller 80 controls the fresh water supply valve 801 and the grinder 40 to produce urea water produced in the mixing tank 30. The concentration of can be adjusted. Alternatively, the concentration of urea water may be adjusted by adjusting the amount of fresh water supplied from the fresh water supply line 60 with the flow control valve 804. In detail, in order to increase the concentration of urea water, the controller 80 adjusts the fresh water supply valve 801 to reduce the amount of fresh water supplied to the mixing tank 30, or adjust the grinder 40 to adjust the urea powder. Can increase the production of. In order to reduce the concentration of urea, the controller 80 controls the fresh water supply valve 801 to increase the amount of fresh water supplied to the mixing tank 30, or adjust the grinder 40 to produce the amount of urea powder. Reduce or reduce the flow rate control valve 804 may further supply fresh water. The concentration of the prepared urea water may be detected by the urea water concentration sensors 83 and 84 and transferred to the controller 80.

Meanwhile, when the amount of nitrogen oxide detected by the first sensor 81 increases, the controller 80 may increase the supply amount of urea by adjusting the flow control valves 803 and 804 to increase the supply amount of urea water. .

When the amount of nitrogen oxide detected by the first sensor 81 decreases, the controller 80 may control each component as opposed to the above description, and thus a detailed description thereof will be omitted.

As described above, the amount of nitrogen oxide included in the exhaust gas is reduced by adjusting the amount of urea supplied to the SCR 90, and may be determined by the amount of nitrogen oxide detected by the second sensor 82. The control unit 80 is based on the difference in the amount of nitrogen oxides detected by the first sensor 81 and the second sensor 82, i), ii above if the reduction in the amount of nitrogen oxides does not meet the set reference value Can be used to increase the supply of urea, and if the set threshold is exceeded, the supply of urea can be reduced.

The urea in which the supply amount is adjusted is supplied to the SCR 90 in the form of urea water and decomposes nitrogen oxides by the catalyst in the SCR 90. Thereby, the exhaust gas can be discharged to the outside of the ship 1 in a state where nitrogen oxide is removed.

In addition, since the amount of urea supplied can be actively adjusted according to the amount of nitrogen oxide contained in the exhaust gas, it is possible to effectively remove nitrogen oxide with a limited amount of urea.

In addition, even if a large amount of nitrogen oxide is discharged, since the fresh water is supplied using the fresh water production apparatus 20, a sufficient amount of urea water can be produced, so that nitrogen oxide contained in the exhaust gas can be stably removed. Specifically, in the case of the prior art No. 10-2010-0132310 is used because the moisture contained in the exhaust gas, when the amount of nitrogen oxide contained in the exhaust gas is not enough to produce enough urea water for its decomposition, The ship 1 according to the embodiment of the present invention can prevent such a problem.

On the other hand, the controller 80 controls the bypass valve 805 so that the exhaust gas is discharged directly without passing through the SCR when the amount of nitrogen oxide in the exhaust gas generated by the ship is below the reference value or does not pass through the regulated region. can do.

In addition, the controller 80 may be configured in consideration of the distance, the composition and flow rate of the exhaust gas generated from the ship, and the concentration and amount of urea water remaining in the mixing tank 30 when it is expected to be out of the TIER III restricted area. It is possible to control the timing of interruption of the solid urea.

After consuming all of the urea water prepared in advance in the mixing tank 30, the control unit 80 is to put only fresh water to the interior of the mixing tank 30, the injection device 70, and the SCR (90) It is possible to prevent the passage, such as the pipe, the injector 70, and the SCR 90, from being blocked by the remaining urea after cleaning. The role of the controller 90 may be set to be automatically performed, or may be set to be manually performed by a user's operation.

On the other hand, the control unit 80 may selectively use a method suited to the characteristics of the SCR 90 mounted on the vessel 1 of the above i), ii) method.

2 is a flowchart showing a control method of a ship according to an embodiment of the present invention.

Referring to FIG. 2, the controller 80 may adjust the concentration of urea water or the supply amount of urea water according to the amount of nitrogen oxide contained in the exhaust gas.

Specifically, the first sensor 81 and the second sensor 82 measure the amount of nitrogen oxide contained in the exhaust gas before and after passing through the SCR (90) (S202).

The controller 80 determines whether the measured value is a value included in a preset range, and determines whether it is necessary to adjust the amount of urea supplied to the SCR 90 (S204). Here, in addition to the preset range, the controller 80 may simply compare the measured amount of nitrogen oxide at the front end or the rear end with a reference value at a predetermined time or time point, or compare the difference value between the front end and the rear end with a preset reference value. In addition, the amount of change over time may be compared with a preset reference amount of change.

If it is determined that the amount of urea supplied to the SCR 90 needs to be adjusted, the controller 80 determines whether to adjust the amount of urea by adjusting one or more of the concentration of urea water and the amount of urea water supplied (S206). ).

In operation S206, the controller 80 may determine based on a value previously stored in a memory (not shown) of the ship 1. The memory may store in advance information on which of the concentration of urea water and the supply amount of urea water is more suitable for the corresponding SCR 90, and the controller 80 reads the corresponding information from the memory, and The concentration of urea water or the amount of urea water supplied can be adjusted accordingly.

In addition, the controller 80 may determine which of the concentration of urea water and the amount of supply of urea water to be adjusted according to the previously performed control result. In detail, the memory includes a difference between the values detected by the first sensor 81 and the second sensor 82 after the concentration of the urea water is adjusted, and the first sensor 81 and the second sensor after the supply amount of the urea water. 82, the difference amount of the value detected may be stored, and the controller 80 compares the two difference amounts to determine what is more effective, and accordingly adjusts either the concentration of urea water or the supply amount of urea water. Can be determined.

The controller 80 determines one or more of the concentration of the urea water and the supply amount of the urea water to be supplied to the SCR 90 according to the method determined in step S206, and accordingly, the grinder 40, the fresh water supply valve 801, the flow rate Control valves 803 and 804 can be adjusted.

As described above as a specific embodiment of the ship and the control method of the ship, but this is only an example, the present invention is not limited to this, having the broadest range in accordance with the basic idea disclosed herein Should be interpreted as Skilled artisans may implement a pattern of features that are not described in a combinatorial and / or permutational manner with the disclosed embodiments, but this is not to depart from the scope of the present invention. It will be apparent to those skilled in the art that various changes and modifications may be readily made without departing from the spirit and scope of the invention as defined by the appended claims.

1: Vessel 10: Storage Tank
11: solid urea 20: fresh water production apparatus
30: mixing tank 40: grinder
50: urea water return line 60: fresh water supply line
70: injector 80: control unit
81: first sensor 82: second sensor
83, 84: urea water concentration sensor 801, 803, 804, 805: valve
90: SCR

Claims (14)

A storage tank in which solid urea is stored;
A crusher for pulverizing the solid urea stored in the storage tank;
Fresh water production apparatus for producing fresh water;
A mixing tank for preparing urea water by mixing the fresh water provided by the fresh water production device and the urea ground in the crusher;
An SCR for decomposing nitrogen oxide contained in exhaust gas discharged from an engine; And
And a spraying device for injecting urea water supplied from the mixing tank to exhaust gas discharged from the engine. The method of claim 1,
The fresh water producing apparatus is at least a fresh water producing apparatus for producing drinking water,
The fresh water supplied to the mixing tank is a vessel characterized in that the fresh water is not mixed with minerals. The method of claim 1,
And a fresh water supply line for bypassing the mixing tank and supplying fresh water produced in the fresh water manufacturing device to the injection device. The method of claim 1,
And a urea water return line for returning the urea water discharged from the mixing tank to the mixing tank. The method of claim 1,
The crusher is a vessel characterized in that it is provided integrally with the storage tank. The method of claim 1,
A first sensor disposed at a front end of the SCR and measuring an amount of nitrogen oxide included in exhaust gas flowing into the SCR;
A second sensor disposed at a rear end of the SCR and measuring an amount of nitrogen oxide included in exhaust gas discharged from the SCR; And
And a controller configured to adjust an amount of urea supplied to the SCR based on at least one measured value of the first sensor and the second sensor. The method according to claim 6,
The control unit controls the amount of urea supplied to the SCR by adjusting at least one or more of the concentration of the urea water supplied to the injector and the amount of urea water supplied to the injector. The method according to any one of claims 1 to 7,
A position sensing device for determining the position of the vessel; And
And a control unit for controlling only fresh water to be supplied to the mixing tank or the injector according to the position of the vessel identified by the position detecting device. The method of claim 8,
The control unit,
When only fresh water is supplied to the injector, the vessel characterized in that for supplying the fresh water supplied from the fresh water manufacturing device to the injector by bypassing the mixing tank. In the control method of a ship comprising an SCR,
Measuring the amount of nitrogen oxide contained in the exhaust gas at least one of the front end and the rear end of the SCR;
Determining whether a change is necessary in the amount of urea supplied for the SCR; And
If a change in the supply amount of urea is required, controlling the vessel comprising adjusting at least one of the concentration of urea water and the supply amount of urea water by adjusting the amount of grinding of solid urea or the amount of fresh water supplied from the fresh water production apparatus. Way. 11. The method of claim 10,
Information on which one of the concentration of the urea water and the amount of supply of the urea water to be adjusted is stored in the memory in advance. 11. The method of claim 10,
The control method of the ship, characterized in that the control of the concentration of the urea water and the supply amount of the urea water is determined based on the measurement results of the front end and the rear end of the previously measured SCR. 11. The method of claim 10,
Determining the position of the vessel; And
According to the identified position of the vessel, the control method of the ship further comprising the step of supplying only fresh water to the mixing tank for adjusting the solid urea and fresh water and the injection device for injecting urea water into the exhaust gas. The method of claim 13,
When only fresh water is supplied to the injector,
The control method of the ship, characterized in that the fresh water supplied from the fresh water manufacturing apparatus for producing fresh water bypassed the mixing tank.

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