KR20230003922A - Urea manufacturing device and thereof method - Google Patents

Abstract

According to an embodiment of the present invention, a urea solution manufacturing apparatus is provided. According to an embodiment of the present invention, the urea solution manufacturing apparatus can comprise: a chamber having a storage space where urea solution is generated inside; an elastic support unit elastically supporting the chamber; a urea supply unit supplying urea into the chamber; a pure water supply unit supplying pure water into the chamber; a sensor unit detecting the movements or position of the chamber; a calculation unit receiving a sensing signal from the sensor unit, and calculating the number of vibrations of the chamber, and calculating the mass of urea stored in the chamber; and a control unit controlling the urea supply unit and the pure water supply unit and controlling the volume of urea and pure water supplied into the chamber. Therefore, a fixed quantity of urea can be supplied into a chamber even if a ship shakes.

Description

Urea manufacturing device and manufacturing method {Urea manufacturing device and its method}

The present invention relates to an apparatus and method for producing urea water, and more particularly, to an apparatus and method for producing urea water capable of easily producing urea water at an appropriate concentration by supplying a fixed amount of urea and fresh water even when a ship is shaken. It is about.

In general, various engines installed in ships generate power by burning fossil fuels, and exhaust gases generated during the combustion of fossil fuels include nitrogen oxides, sulfur oxides, carbon dioxide, and the like. As air pollution increases, regulations on various harmful substances included in exhaust gas are getting stricter. Accordingly, a selective catalytic reduction reactor (SCR) is installed to reduce nitrogen oxides included in exhaust gas. is essential

The selective catalytic reduction reactor passes exhaust gas mixed with a reducing agent through a catalyst layer installed inside the reactor to reduce nitrogen oxides to nitrogen and water, and gaseous ammonia is used as the reducing agent. Ammonia in the gaseous phase has a high risk of explosion and high corrosiveness, so it is difficult to store and use. Therefore, conventionally, urea water capable of producing ammonia is stored in a tank, and when necessary, urea water is thermally decomposed in a selective catalytic reduction reactor. It was used after converting to gaseous ammonia. However, the number of urea must maintain the temperature condition of 0 ~ 35 ℃ during storage, and even if the temperature condition is maintained, the uniformity changes due to stratification over a long period of time and the performance deteriorates. There is a problem with costs. Therefore, in recent years, a system for producing urea water by mixing urea and fresh water has been introduced, but the load cell that measures the mass of urea and fresh water is sensitive to the vibration of the ship, so it is difficult to supply a fixed amount of urea and fresh water. There were difficulties.

Accordingly, there is a need for a urea water manufacturing device capable of supplying a fixed amount of urea and fresh water even when the ship is shaken.

Republic of Korea Patent Publication No. 10-2020-0104690 (2020. 09. 04.)

A technical problem to be achieved by the present invention is to provide a urea water manufacturing device capable of easily producing urea water at an appropriate concentration by supplying a fixed amount of urea and fresh water even when the ship is rocking.

Another technical problem to be achieved by the present invention is to provide a method for producing urea solution capable of easily producing urea solution at an appropriate concentration by supplying a quantity of urea and fresh water even when the vessel is shaken.

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 following description.

An apparatus for producing urea water according to an embodiment of the present invention for achieving the above technical problem includes a chamber having an accommodation space in which urea water is generated, an elastic support unit for elastically supporting the chamber, and supplying urea into the chamber. An element supply unit for supplying fresh water to the inside of the chamber, a sensor unit for detecting the movement or position of the chamber, and a sensing signal received from the sensor unit to calculate the frequency of vibration of the chamber to enter the chamber. It includes a calculation unit for calculating the mass of the received element, and a control unit for controlling the amount of the element and the fresh water supplied into the chamber by controlling the element supply unit and the fresh water supply unit.

The control unit may first supply the element into the chamber and control the supply amount of the fresh water according to the mass of the element supplied into the chamber.

The control unit supplies a smaller amount of the fresh water than the amount of the urea supplied into the chamber to first prepare urea water having a higher concentration than the reference concentration, and additionally supplies the fresh water to set the concentration of the urea water to the reference standard. concentration can be adjusted.

The device for producing urea water has one end connected to the chamber and the other end connected to a selective catalytic reduction reactor for reducing nitrogen oxides contained in exhaust gas generated from a combustion engine of a ship, so that the urea water is connected to the selective catalytic reduction reactor. It may further include a urea water supply pipe supplying to.

The urea water production device further includes a storage tank installed on the urea water supply pipe and located below the chamber to store the urea water, and the elastic support may be interposed between the chamber and the storage tank. there is.

At least a portion of the urea water supply pipe between the chamber and the storage tank may be formed to be flexible.

A method for manufacturing the number of urea according to an embodiment of the present invention for achieving the above another technical problem includes the steps of (A) supplying urea into the chamber, and (B) detecting the movement or position of the chamber; (C) calculating the mass of the element accommodated in the chamber by calculating the frequency of the chamber based on the movement or location information of the chamber, and supplying fresh water according to the mass of the element accommodated in the chamber to and (D) generating a number.

In the step (D), the fresh water is supplied less than the amount of the urea supplied into the chamber to prepare urea water higher than the reference concentration first, and the fresh water is additionally supplied to increase the concentration of the urea water. It can be adjusted to the standard concentration.

According to the present invention, instead of measuring the mass of the element using a load cell, the mass of the element is calculated by calculating the frequency of the chamber based on the movement or positional information of the chamber where the element is supplied, so that even if the ship is rocking, the quantitative element can be fed into the chamber.

In addition, instead of measuring the mass of fresh water using a load cell, a flow meter is installed on the fresh water supply unit for supplying fresh water to measure the flow rate of fresh water, so that even if the ship is shaken, a fixed amount of fresh water can be supplied to the chamber.

Even when the ship is rocking, urea at an appropriate concentration can be easily produced by supplying urea and fresh water in a fixed amount, and nitrogen oxides included in the exhaust gas can be easily removed as the manufactured urea is supplied to the selective catalytic reduction reactor. can reduce

1 is a perspective view showing an apparatus for producing urea water according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view of the urea solution manufacturing device of FIG. 1 cut in a longitudinal direction.
Figure 3 is a flow chart showing a method for producing urea water.
4 to 7 are operational diagrams for explaining the operation of the urea water manufacturing device.

Advantages and features of the present invention, and methods of achieving them, will become clear with reference to the detailed description of the following embodiments taken in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and only these embodiments make the disclosure of the present invention complete, and common knowledge in the art to which the present invention belongs. It is provided to completely inform the person who has the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numbers designate like elements throughout the specification.

Hereinafter, with reference to FIGS. 1 to 7, an apparatus and method for manufacturing urea water according to an embodiment of the present invention will be described in detail.

An apparatus for producing urea water according to an embodiment of the present invention is a device for producing urea water to be used as a reducing agent by being supplied to a selective catalytic reduction reactor, and may be installed in a ship.

Instead of measuring the mass of the element using a load cell, the urea water manufacturing device calculates the mass of the element by calculating the vibration frequency of the chamber based on the movement or position information of the chamber where the element is supplied, so that even if the ship is rocking, the quantitative element can be fed into the chamber. In addition, instead of measuring the mass of fresh water using a load cell, a flow meter is installed on the fresh water supply unit for supplying fresh water to measure the flow rate of fresh water, so that even if the ship is shaken, a fixed amount of fresh water can be supplied to the chamber. Even when the ship is rocking, urea at an appropriate concentration can be easily produced by supplying urea and fresh water in a fixed amount, and nitrogen oxides included in the exhaust gas can be easily removed as the manufactured urea is supplied to the selective catalytic reduction reactor. There are features that can be reduced.

Hereinafter, with reference to FIGS. 1 and 2, the urea water manufacturing device 1 will be described in detail.

1 is a perspective view showing an apparatus for producing urea water according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view of the apparatus for producing urea water in FIG. 1 cut in a longitudinal direction.

The urea water manufacturing apparatus 1 according to the present invention includes a chamber 10, an elastic support unit 20, an urea supply unit 30, a fresh water supply unit 40, a sensor unit 50, and a calculation unit 60. , and a control unit 70.

The chamber 10 is a tubular member having an accommodating space 10a in which urea water is generated, and an urea supply unit 30 and a fresh water supply unit 40 to be described later are connected to each other. The urea supply unit 30 has one side connected to a urea storage tank (not shown) to supply urea into the chamber 10, and the urea storage tank has a chemical formula of CH ₄ N ₂ O and is a colorless and odorless crystalline substance. Solid elements in the form of powder or granules or pellets may be stored. For example, the solid element may be in the form of powder, grains, or pellets of a certain size, may be in the form of powders, grains, or pellets of different sizes, or may be a mixture of powders, grains, or pellets of different sizes. . One side of the fresh water supply unit 40 is connected to a fresh water generator (not shown) or a fresh water storage tank (not shown) to supply fresh water into the chamber 10 . Since the flow meter 41 is installed on the fresh water supply unit 40, even if the ship is shaken, a constant amount of fresh water can be supplied to the chamber 10. The chamber 10 generates urea water by mixing urea supplied from the urea supply unit 30 with fresh water supplied from the fresh water supply unit 40, and a stirring device (not shown) therein for smooth mixing of urea and fresh water. ) can be installed. The chamber 10 may be made of a synthetic resin having low thermal conductivity to prevent the heat of urea water generated by dissolving urea from being released to the outside and freezing of the urea water at a low temperature below the freezing point. A heat insulating material to increase the heat insulating effect may be additionally installed. This chamber 10 is supported by an elastic support part 20 .

The elastic support unit 20 elastically supports the chamber 10 and may be formed of an elastic member having appropriate rigidity. For example, the elastic support 20 may be formed of a compression coil spring. In the drawing, four elastic supports 20 are disposed below the chamber 10 to elastically support the chamber 10, but it is not limited thereto, and the shape, number, and arrangement of the elastic supports 20 It can be modified in various ways. As the elastic support unit 20 elastically supports the chamber 10, when urea or fresh water is supplied to the inside of the chamber 10, the chamber 10 may be moved in a vertical direction or its position may be changed.

The sensor unit 50 senses the movement or position of the chamber 10 and may be, for example, a laser sensor that irradiates laser toward the chamber 10 . The sensor unit 50 irradiates laser toward the target 11 fixed to the outside of the chamber 10, and measures the movement or position of the chamber 10 based on the period or position of the laser reaching the target 11. can detect Hereinafter, a structure in which the sensor unit 50 senses the movement of the chamber 10 based on the cycle of the laser reaching the target 11 will be described with more emphasis.

The sensor unit 50 may detect the movement of the chamber 10 based on the cycle of the laser reaching the target 11 . For example, when the amount of elements supplied into the chamber 10 is small, the chamber 10 moves rapidly with a small amplitude, so the period of the laser reaching the target 11 may be short. In other words, if the cycle of the laser reaching the target 11 is shorter than the set cycle, it can be seen that less elements are supplied than the quantity. Conversely, when the amount of elements supplied into the chamber 10 is large, the chamber 10 moves slowly with a large amplitude, so the period of the laser reaching the target 11 may be long. In other words, if the period of the laser reaching the target 11 is longer than the set period, it can be seen that more elements are supplied than the quantity.

The sensor unit 50 is electrically connected to the operation unit 60, and the operation unit 60 receives the sensing signal from the sensor unit 50 and calculates the frequency of the chamber 10 to determine the number of elements accommodated in the chamber 10. mass can be calculated. Hereinafter, a structure in which the arithmetic unit 60 calculates the frequency of the chamber 10 and calculates the mass of the element accommodated in the chamber 10 will be described with more emphasis. The calculation unit 60 calculates the frequency of the chamber 10 by applying the cycle of the laser reaching the target 11 transmitted from the sensor unit 50 to Equation 1 below, and calculates the frequency of the chamber 10. The mass of the element accommodated in the chamber 10 can be calculated by applying the frequency to <Equation 2> below.

<Formula 1>

(f=the frequency of the chamber, t=the period of the laser reaching the target)

<Formula 2>

(f = frequency of chamber, k = stiffness of elastic support, m = sum of mass of chamber and element)

That is, the frequency of the chamber 10 is calculated in response to the amount of elements to be supplied into the chamber 10, and the cycle of the laser reaching the target 11 corresponds to the calculated frequency of the chamber 10 in advance. If set in the sensor unit 50, it can be seen that a quantity of elements is supplied to the chamber 10 through the movement of the chamber 10 detected by the sensor unit 50. Instead of measuring the mass of the element using a load cell as in the prior art, the mass of the element is measured by calculating the frequency of the chamber 10 based on the movement of the chamber 10, so that the chamber 10 is always in the chamber 10 even when the ship is rocking. Quantitative elements can be supplied. As such, by supplying a quantity of urea and fresh water to the chamber 10, urea water at an appropriate concentration can be produced inside the chamber 10.

On the other hand, the urea supply unit 30 and the fresh water supply unit 40 may be controlled by the control unit 70. The control unit 70 controls the amount of urea and fresh water supplied into the chamber 10. The urea is first supplied into the chamber 10, and the amount of fresh water is supplied according to the mass of the urea supplied into the chamber 10. can control. More specifically, the control unit 70 supplies a smaller amount of fresh water than the amount of urea supplied into the chamber 10 to first prepare urea water higher than the reference concentration, and additionally supplies fresh water to the concentration of urea water. can be adjusted to the standard concentration. For example, the control unit 70 supplies the amount of fresh water by 1 to 10% less so that the concentration of the urea solution is made about 1 to 10% higher than the reference concentration in consideration of the measurement error caused by the movement of the chamber 10, After the operation of the stirring device or when the urea is completely dissolved in the fresh water after a certain period of time, the concentration is measured, and then fresh water is additionally supplied based on the measured concentration to adjust the concentration of the urea water to the standard concentration. To measure the concentration of urea water, a concentration meter (not shown) may be installed inside the chamber 10 . The control unit 70 adjusts the number of urea to the standard concentration by first preparing the number of urea higher than the reference concentration and then additionally supplying fresh water, so that the error range is minimized and the concentration of the number of urea is as close as possible to the reference concentration of 40%. And, because of this, the performance of the number of elements can be maximized.

이상의 고온일 경우, 전술한 바와 같이, 배기가스에 요소수를 직접 분사하여 배기가스의 열로 요소수를 분사하는 것이 가능하지만, 배기가스가 280

미만의 저온일 경우, 배기가스의 열로 요소수를 열분해할 수 없다. 따라서, 저온의 배기가스를 정화하기 위해 선택적촉매환원반응기(81) 내부에는 촉매층 전단에 요소수를 암모니아로 전환시키기 위한 별도의 가열기가 설치될 수 있다. 선택적촉매환원반응기(81)는 요소수공급관(80)을 통해 요소수를 공급받을 수 있다.The urea water generated in the chamber 10 is supplied to the selective catalytic reduction reactor 81. The selective catalytic reduction reactor 81 reduces nitrogen oxides contained in the exhaust gas generated from the combustion engine of the ship, and is connected to an exhaust pipe (not shown) for discharging the exhaust gas generated from the combustion engine. The selective catalytic reduction reactor 81 injects the urea water supplied from the chamber 10 into the exhaust gas, whereby the urea water can be pyrolyzed by the heat of the exhaust gas and converted into ammonia. The converted ammonia passes through a catalyst layer installed inside the reactor together with the exhaust gas to reduce nitrogen oxides contained in the exhaust gas to nitrogen and water, and the exhaust gas from which the nitrogen oxides are removed can be released into the atmosphere through an exhaust pipe. On the other hand, the exhaust gas discharged from the combustion engine is 280

In the case of the high temperature above, as described above, it is possible to directly inject urea water into the exhaust gas and inject the urea water into the heat of the exhaust gas,

When the temperature is less than 100%, the urea water cannot be thermally decomposed by the heat of the exhaust gas. Therefore, in order to purify low-temperature exhaust gas, a separate heater for converting urea water into ammonia may be installed in the front of the catalyst layer inside the selective catalytic reduction reactor 81. The selective catalytic reduction reactor 81 may receive urea water through the urea water supply pipe 80 .

The urea water supply pipe 80 may have one end connected to the chamber 10 and the other end connected to the selective catalytic reduction reactor 81 to supply urea water to the selective catalytic reduction reactor 81 . A storage tank 90 is installed on the urea water supply pipe 80, and the storage tank 90 is located below the chamber 10 to temporarily store urea water supplied to the selective catalytic reduction reactor 81. That is, the storage tank 90 may serve as a kind of buffer tank. The above-described elastic support unit 20 is interposed between the chamber 10 and the storage tank 90 to elastically support the chamber 10, and the above-described sensor unit 50 is fixedly installed on top of the storage tank 90 and is installed in the chamber 10. The movement or position of (10) can be sensed. As the elastic support part 20 is interposed between the chamber 10 and the storage tank 90, at least a part of the urea water supply pipe 80 between the chamber 10 and the storage tank 90 is formed to be flexible, so that the chamber The movement of (10) can be easily coped with. In addition, valves (not shown) are provided on the urea water supply pipe 80 between the chamber 10 and the storage tank 90 and on the urea water supply pipe 80 between the storage tank 90 and the selective catalytic reduction reactor 81. ) is installed so that the flow of urea water can be controlled. However, it is not limited to that the storage tank 90 is installed on the urea water supply pipe 80, and the storage tank 90 may be omitted if necessary. When the storage tank 90 is omitted, the elastic support part 20 may be fixed to the floor or a separate support member of the space where the urea water production device 1 is installed, and the sensor unit 50 is also the floor or support member can be fixedly installed.

Hereinafter, with reference to FIG. 3, a method for preparing urea solution will be described in detail.

Figure 3 is a flow chart showing a method for producing urea water.

The urea solution manufacturing method according to the present invention includes the step (A) of supplying urea into the chamber 10, the step (B) of detecting the movement or position of the chamber 10, the movement or (C) step of calculating the frequency of the chamber 10 based on the location information and calculating the mass of the element accommodated inside the chamber 10, and supplying fresh water according to the mass of the element accommodated inside the chamber 10 and (D) generating the number of elements.

First, urea may be supplied into the chamber 10 (step (A)). Urea in the form of powder, granules, or pellets having a chemical formula of CH ₄ N ₂ O and being a colorless, odorless crystalline substance is supplied through the urea supply unit 30 controlled by the control unit 70, and the urea supply unit 30 has one side connected to the urea storage tank and the other side connected to the chamber 10 to supply the urea stored in the urea storage tank into the chamber 10. Since the chamber 10 is elastically supported by the elastic support unit 20, when the element is supplied through the element supply unit 30, it moves in the vertical direction or changes its position, and the sensor unit 50 is Motion or position can be detected (step (B)). The sensor unit 50 irradiates laser toward the target 11 fixed to the outside of the chamber 10, and measures the movement or position of the chamber 10 based on the period or position of the laser reaching the target 11. can detect Motion or position information of the chamber 10 sensed by the sensor unit 50 is transmitted to the calculation unit 60, and the operation unit 60 determines the frequency of the chamber 10 based on the motion or position information of the chamber 10. It is possible to calculate the mass of the element accommodated in the chamber 10 by calculating (step (C)). The calculation unit 60 calculates the frequency of the chamber 10 by applying the cycle of the laser reaching the target 11 transmitted from the sensor unit 50 to Equation 1 below, and calculates the frequency of the chamber 10. The mass of the element accommodated in the chamber 10 can be calculated by applying the frequency to <Equation 2> below.

<Formula 1>

(f=the frequency of the chamber, t=the period of the laser reaching the target)

<Formula 2>

(f = frequency of chamber, k = stiffness of elastic support, m = sum of mass of chamber and element)

When the mass of the element accommodated in the chamber 10 is calculated by the calculation unit 60, the number of elements may be generated by supplying fresh water according to the mass of the element accommodated in the chamber 10 (step (D)). The fresh water is supplied through the fresh water supply unit 40 controlled by the control unit 70, and the fresh water supply unit 40 has one side connected to the fresh water generator or the fresh water storage tank and the other side connected to the chamber 10 so that the chamber ( 10) Fresh water can be supplied inside. Since the flow meter 41 is installed on the fresh water supply unit 40, a fixed amount of fresh water can be supplied to the chamber 10 regardless of the shaking of the ship. At this time, the control unit 70 supplies a smaller amount of fresh water than the amount of urea supplied to the inside of the chamber 10 to prepare urea water higher than the reference concentration first, and additionally supplies fresh water to increase the concentration of urea water. It can be adjusted to the standard concentration. The control unit 70 first prepares urea water higher than the standard concentration and then additionally supplies fresh water to adjust the urea water to the standard concentration, so that the urea water concentration is as close as possible to the standard concentration of 40%, thereby maximizing performance. can

On the other hand, when the amount of elements to be supplied into the chamber 10 is determined, the frequency of the chamber 10 is calculated corresponding to the mass of the element, and the target 11 is The period of the laser to reach may be set in the sensor unit 50 in advance. If the period of the laser reaching the target 11 is set in the sensor unit 50 in advance, it can be seen that a quantity of elements is supplied to the chamber 10 through the movement of the chamber 10 detected by the sensor unit 50. Therefore, a fixed amount of elements can be supplied to the chamber 10 regardless of the ship's rocking.

Hereinafter, with reference to FIGS. 4 to 7, the operation of the urea water manufacturing device 1 will be described in more detail.

4 to 7 are operational diagrams for explaining the operation of the urea water manufacturing device.

The urea water manufacturing apparatus 1 according to the present invention calculates the frequency of the chamber 10 based on the motion or positional information of the chamber 10 to which the urea is supplied instead of measuring the mass of the urea using a load cell, Since the mass is calculated, it is possible to supply a fixed amount of elements to the chamber 10 even when the ship is rocking. In addition, instead of measuring the mass of fresh water using a load cell, a flow meter 41 is installed on the fresh water supply unit 40 that supplies fresh water to measure the flow rate of fresh water, so even if the ship is shaken, a constant amount of fresh water is measured in the chamber 10 can be supplied with Even when the ship is rocking, as urea and fresh water are supplied, it is possible to easily produce urea at an appropriate concentration, and as the prepared urea is supplied to the selective catalytic reduction reactor (81), nitrogen oxides included in the exhaust gas are reduced. can also be easily reduced.

First, referring to FIG. 4 , elements may be supplied into the chamber 10 . Urea is supplied through the urea supply unit 30 , and the urea supply unit 30 may supply urea in the form of powder, granules, or pellets stored in the urea storage tank into the chamber 10 . Since the chamber 10 is elastically supported by the elastic support unit 20, when an element is supplied, it moves in a vertical direction or changes its position, and the sensor unit 50 can detect the movement or position of the chamber 10. there is. When the amount of elements to be supplied into the chamber 10 is determined, the frequency of the chamber 10 is calculated corresponding to the mass of the element, and the target 11 is reached in response to the calculated frequency of the chamber 10. The cycle of the laser to be performed can be set in the sensor unit 50 in advance. If the period of the laser reaching the target 11 is set in the sensor unit 50 in advance, it can be seen that a quantity of elements is supplied to the chamber 10 through the movement of the chamber 10 detected by the sensor unit 50. there is. When a fixed amount of urea is supplied into the chamber 10, the control unit 70 closes the urea supply unit 30 to stop the supply of urea, as shown in FIG. 5, and fresh water as shown in FIG. The supply unit 40 is opened to supply fresh water into the chamber 10 . At this time, the control unit 70 supplies a smaller amount of fresh water than the amount of urea supplied to the inside of the chamber 10 to prepare the number of urea higher than the reference concentration first, and after the operation of the stirring device or after a certain time has elapsed, After measuring the concentration when urea is completely dissolved in fresh water, the concentration of urea water may be adjusted to the reference concentration by additionally supplying fresh water based on the measured concentration. When the urea water at the standard concentration is prepared in this series of ways, the control unit 70 opens the urea water supply pipe 80 to move the urea water to the storage tank 90, as shown in FIG. 7, and the storage tank ( The urea water stored in 90) may be supplied to a place in need, for example, to the selective catalytic reduction reactor 81 through the urea water supply pipe 80.

Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art to which the present invention pertains can be implemented in other specific forms without changing the technical spirit or essential features of the present invention. you will be able to understand Therefore, the embodiments described above should be understood as illustrative in all respects and not limiting.

1: urea water manufacturing device
10: chamber 11: target
20: elastic support unit 30: urea supply unit
40: fresh water supply unit 41: flow meter
50: sensor unit 60: calculation unit
70: control unit 80: urea water supply pipe
81: selective catalytic reduction reactor 90: storage tank

Claims (8)

A chamber having an accommodation space in which urea water is generated;
an elastic support unit for elastically supporting the chamber;
an urea supply unit supplying urea into the chamber;
a fresh water supply unit supplying fresh water into the chamber;
a sensor unit that senses the movement or position of the chamber;
A calculation unit for receiving a sensing signal from the sensor unit and calculating a frequency of the chamber to calculate a mass of the element accommodated in the chamber; and
Urea water manufacturing apparatus comprising a control unit for controlling the amount of the urea and the fresh water supplied into the chamber by controlling the urea supply unit and the fresh water supply unit. The method of claim 1, wherein the control unit,
Urea water production device for first supplying the urea into the chamber and controlling the supply amount of the fresh water according to the mass of the urea supplied into the chamber. The method of claim 2, wherein the control unit,
An element that first prepares a higher urea concentration than the reference concentration by supplying a smaller amount of the fresh water compared to the amount of the urea supplied into the chamber, and additionally supplies the fresh water to adjust the concentration of the urea water to the reference concentration. water manufacturing device. According to claim 1,
A urea water supply pipe having one end connected to the chamber and the other end connected to a selective catalytic reduction reactor for reducing nitrogen oxides contained in exhaust gas generated from a combustion engine of a ship and supplying the urea water to the selective catalytic reduction reactor A number of urea manufacturing apparatus further comprising. According to claim 4,
Further comprising a storage tank installed on the urea water supply pipe and located below the chamber to store the urea water,
The elastic support unit is interposed between the chamber and the storage tank. According to claim 5,
At least a part of the urea water supply pipe between the chamber and the storage tank is formed to be flexible. (A) supplying urea into the chamber;
(B) detecting the movement or position of the chamber;
(C) calculating the mass of the element accommodated in the chamber by calculating the frequency of the chamber based on the motion or positional information of the chamber; and
A method for producing urea water comprising the step (D) of generating urea water by supplying fresh water according to the mass of the urea accommodated in the chamber. The method of claim 7, wherein the (D) step,
Compared to the amount of the urea supplied into the chamber, the fresh water is supplied less than the standard concentration to prepare the urea solution first, and the fresh water is additionally supplied to adjust the urea solution concentration to the reference concentration. Way.

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