KR101719134B1 - Device and method for manufacturing of urea water - Google Patents

Abstract

The present invention relates to an apparatus for continuously producing urea solutions, and to a method therefor, intended to continuously produce the urea solutions by undergoing a step of mixing and stirring urea and ultrapure water, a filtering step, and a dilution step. To this end, the apparatus for continuously producing the urea solutions comprises: a stirring container divided into an urea space and a stirring space by forming a porous plate therein; a stirring device accommodated in the stirring space; and a filter part connected to the stirring space and accommodating an immersion film.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001]

The present invention relates to an apparatus and a method for continuously producing urea water.

Patent Document 001 relates to a method for producing ammonia from an element and supplying it to an SCR process to remove nitrogen oxides using the element as a reducing agent. More specifically, the urea aqueous solution is injected into the pyrolysis reactor to decompose the components into ammonia and carbon dioxide, and the pyrolysis gas containing the components is injected into the exhaust gas containing nitrogen oxide. Isothianic acid in the pyrolysis gas mixed with the exhaust gas is hydrated on the catalyst and further converted into ammonia, which acts as a reducing agent together with ammonia produced by pyrolysis, thereby removing nitrogen oxides from the SCR catalyst. Therefore, the same nitrogen oxide removal performance as in the case of using ammonia is obtained, but at the same time, since it is easy to handle and use a safe element, a method of solving safety problems such as transportation, storage and handling due to use of harmful ammonia to provide.

Patent Document 002 provides a solution for preventing freezing of urea water, which is capable of stably storing and transporting urea water, particularly urea water having a high concentration of 30% or more, even in a cold season such as winter. The solution for preventing freezing of urea water contains polyvinyl alcohol as a water-soluble polymer having a molecular weight acid group and an acetate group as a block type, and is used in an amount of 0.1 part by weight to 0.5 part by weight based on 100 parts by weight of urea water.

Patent Document 003 relates to a high-purity urea water producing apparatus and a high-purity urea water producing apparatus using the same to produce high-quality urea water by highly refining low-cost low-urea water containing impurity ions. A pure water supply unit for supplying purified water, pure water supplied from the pure water supply unit, an element dissolving unit for receiving a solid element input from the outside through a urea inlet port and passing through a dissolution process; A solid transfer pump for injecting the solid element and pure water together at the lower portion of the urea dissolving unit together with the strong suction at the upper portion of the element dissolution unit and strongly dissolving the solid element by the vortex generated at this time; A precise metering section including a pre-sorter which is located at the lower end of the urea dissolution section and precisely measures the supply amount of pure water, a level gauge installed on the side wall of the urea dissolution section, and a flow meter; A first polymeric filter unit for removing impurity ions contained in the urea water supplied through the transfer pump by ion exchange; a second polymeric filter unit for removing impurity ions contained in the urea water supplied through the transfer pump by ion exchange; A second polymer filter material part which is supplied with the urea water treated first in the first polymer filter material part and laminated or removed from the ammonium salt and the composite metal salt contained in the urea water; And a filter unit for finally subjecting the water to a filtration treatment.

Patent Document 004 shows a method of removing tree jets from a urea water more efficiently, a method of producing a high purity urea water, and a method of recovering tree jets from urea water. A step of dissolving the urea water in water to make the number of urea water white; the step of whitening the urea water in a temperature range of 17 degrees or less to -5 degrees or more; As a manufacturing method. Cooling the urea water containing urea and triulet as impurities to a temperature range of 17 degrees or less to less than or equal to -5 degrees to precipitate the trieolate to cloud the urea water; And a step of passing the urea water through the ion exchange resin in a state where the trie well is separated from the urea water having the step of trapping the precipitated trieolate on the ion exchange resin.

KR 10-0595844 B1 (June 23, 2006) KR 10-1146708 B1 (May 09, 2012) KR 10-1544503 B1 (August 07, 2015) KR 10-2016-0025523 A (Mar 08, 2016)

The present invention relates to an apparatus and a method for continuously producing urea water, and aims at continuously producing urea water by mixing and stirring the urea and ultrapure water, filtering and diluting.

The present invention provides a urea water producing apparatus comprising an agitating vessel 100 in which a perforated plate 110 is formed to separate an element space S1 and an agitation space S2, An agitator 200 accommodated in the agitating space S2 and a filter 300 communicating with the agitating space S2 and accommodating the immersion layer 310. [

The urea water producing apparatus of the present invention comprises a urea water discharge pipe 411 communicating with the interior of the immersion membrane and discharging urea water to the structure of the stirring vessel, the stirrer and the filter unit of the present invention, An ultrapure water supply pipe 412 for supplying the ultrapure water, and a mixing tank 400 for connecting the urea water discharge pipe and the ultrapure water supply pipe.

The urea water producing apparatus of the present invention comprises a dilution element water discharge pipe (501) communicating with the mixing tank and discharging dilution urea water, a storage tank (502) into which the dilution element water discharge pipe is inserted, A purifying filter (503) inserted into the dilution element water discharge pipe; And an ion filter 504.

The method of producing urea water according to the present invention comprises continuously introducing urea and ultrapure water into a vessel (S100), a dissolution step (S200) of dissolving urea in ultrapure water after the introduction step, stirring the dissolved urea water And a stirring step (S300) of stirring the mixture.

INDUSTRIAL APPLICABILITY The present invention can improve productivity by continuously producing urea water at room temperature.

Industrial Applicability The present invention has the effect of supplying the element and the ultrapure water to one container as gravity and automatically supplying ultrapure water, so that the production power consumption is small and a large number of dissolving elements can be quickly secured.

The present invention can increase the stirring efficiency because a plurality of stirrers stir the number of dissolving elements by various methods.

The present invention separates the triune net by the submerged membrane filter and separates the triune net attached to the submerged membrane by nitrogen bubbles, thereby improving the filter efficiency.

The present invention can increase production efficiency by injecting high-concentration urea water and ultrapure water into a mixing tank in accordance with a set ratio, mixing and mixing in a mixing tank, and measuring density density specific gravity in a mixing tank in real time.

The present invention can produce urea water having high purity by purifying urea water and ionizing it by a secondary filter.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of the element space, ultrapure water storage vessel, and stirring space arrangement of the present invention. FIG.
2 is a perspective view of the submerged membrane, mixing tank, and nitrogen supplier arrangement of the filter portion of the present invention.
3 is a schematic perspective view of a mixing tank, an ion filter and a purifying filter according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

(Example 1-1) The urea water producing apparatus of the present invention comprises an agitating vessel 100 in which a perforated plate 110 is formed to separate an element space S1 and an agitation space S2, And a filter unit 300 communicating with the stirring space S2 and accommodating the immersion membrane 310. [

Embodiment 1-1 The invention is an invention relating to a urea water continuous production apparatus, wherein a perforated plate is inserted into an agitating vessel, and the perforated plate is divided into an element space and a stirring space. The element is fed into the element space, and the automatic element feeder replenishes the element consumption of the element space in real time. The stirring space is a space for accommodating the generated number of dissolving elements generated by the contact between the element and the ultrapure water, and the stirrer of the stirring space forcibly gives the fluid flow to stir the dissolving element water. The number of dissolved dissolved elements separates the triol from the filter part.

 (Embodiment 1-2) In the urea water producing apparatus of the present invention, the ultrapure water supply pipe 101 is formed in the element space in Embodiment 1-1.

Embodiment 1-2 The invention supplies ultrapure water to the element space, and the ultrapure water supply tube is located above the element space. The ultrapure water sprayed from the ultrapure water supply pipe is contacted with the element as it flows through the element space, and dissolves the element at room temperature and generates a high concentration of dissolved element water. The high concentration dissolved urea water is collected in the stirring space by gravity.

(Embodiment 1-3) The urea water producing apparatus of the present invention is characterized in that in the embodiment 1-1 or the embodiment 1-2, the urea water producing apparatus is located in the element space and accommodates ultrapure water, And an ultrapure water storage container 120 which forms the ultrapure water storage container 120.

Example 1-3 The object of the invention is to rapidly increase the contact between the ultrapure water and the element, and the ultrapure water storage container is inserted into the element space. Since a plurality of injection holes are formed on the side of the ultrapure water storage container, the ultrapure water of the ultrapure water storage container is rapidly supplied to the element space.

(Embodiment 1-4) The urea water producing apparatus of the present invention comprises, in Embodiment 1-3, a ball tower 122 formed in the ultrapure water storage vessel and coupled with the ultrapure water supply pipe.

Example 1-4 The invention is an apparatus for replenishing ultrapure water to an ultrapure water storage vessel. When the water level of the ultrapure water storage container is lowered, the buoyancy hole of the ball tower is moved downward, and the valve of the ball tower is opened and closed to supply ultrapure water. Further, when the water level of the ultrapure water storage container reaches the appropriate water level, the buoyancy hole of the ball tower is moved upward to close the valve. This automatically replenishes the ultra pure water in the ultra pure water storage vessel.

As another embodiment, the present invention includes a sensor for measuring the level of the ultra pure water, and an ultrapure water supply control device for measuring the measured sensor signal in real time and controlling the ultrapure water supply valve. The sensor may be an ultrasonic sensor or an equivalent sensor.

 (Embodiment 1-5) The urea water producing apparatus of the present invention is the apparatus for producing urea water according to Embodiment 1-1, wherein the stirrer includes an electric motor 211 outside the stirring vessel, one side of which is coupled with the electric motor, And a plurality of wings 213 coupled to the other side of the rotation shaft.

Example 1-5 The invention is to stir a high concentration of dissolution factor in the stirring space. There is a dissolving particulate element in the water of the dissolving element obtained by the contact between the ultrapure water and the element, and stirring action is performed by the rotating vane for complete dissolution of the particulate element. The driving of the rotating blades is based on the external electric motor rotational force. The rotational speed of the rotary blades is controlled in accordance with the viscosity of the number of dissolving elements.

(Example 1-6) The urea water producing apparatus of the present invention is the apparatus for producing a urea water according to Example 1-1, wherein the stirrer includes an underwater pump 223 in which an inlet 221 and an outlet 222 are formed in the stirring space do.

Example 1-6 The invention is to stir a high concentration of dissolution factor in the stirring space. An underwater pump is located in the agitation space, and the operation of the underwater pump enables the agitation of the dissolution element water by imparting fluid motion to the dissolution element water. In addition, the outlet is re-introduced into the element space to increase the dissolution rate

 (Embodiment 1-7) In the apparatus for producing urea water according to Example 1-1, the stirrer is such that the inlet 231 is located inside the stirring space and the outlet 232 is formed in the element space And a mild pump 233.

Example 1-7 The object of the invention is to secure a high concentration of urea water. An inlet is formed in the stirring space, an outlet is formed in the element space, and a circulation pump is mounted in the middle. The circulation pump reuses the solvent in the agitation space into the element space. A mild pump increases the flow rate to the dissolved element water, and the outlet injects the dissolved element water at high speed. This can increase the dissolution effect.

Examples 1-8 The urea water producing apparatus of the present invention is the apparatus for producing a urea water according to Examples 1-5, 1-6, and 1-7, wherein the stirrer includes a wing, an underwater pump, a wing and a circulating pump, And a combination of a circulation pump, a wing, and a combination of an underwater pump and a circulation pump.

If the number of dissolution factors in the stirring space is insufficient or the viscosity is high, an effective continuous production effect can not be obtained. Therefore, the inventions of Examples 1-5, Examples 1-6, and 1-7 are combined for sufficient securing and stirring of the number of dissolving elements. That is, the two combinations are a combination of wing and submersible pump, wing and circulation pump, submersible pump and circulation pump. The three combinations are a combination of a wing, an underwater pump, and a circulating pump.

(Embodiment 1-9) The urea water producing apparatus of the present invention is similar to that of Embodiment 1-1 except that the urea water producing apparatus of Embodiment 1-1 comprises a nitrogen supply portion 321 formed below the immersion membrane and forming a plurality of through holes 323, And a nitrogen container 322 that supplies nitrogen to the supply portion and is formed outside the filter portion.

An immersion membrane is accommodated in the filter unit, and a separate space is formed in the immersion membrane. The outer space of the immersion membrane accommodates the dissolving element water, and the inner space of the immersion membrane accommodates the high purity urea water in which the triol is separated. That is, the immersion film secures the number of high purity elements separated from the trieol in the number of dissolved elements. The number of dissolution urea obtained at room temperature includes many triuret crystals and undissolved microelement powders, which adhere to the outer surface of the immersion membrane to resist securing high purity urea water. In order to prevent this, the nitrogen supply portion is located inside the filter portion, and the nitrogen gas ejected through the nitrogen feed port is separated from the immersion membrane by the bubble action, thereby separating the trierite crystal on the immersion membrane surface. Nitrogen gas in the nitrogen supply portion is supplied from the outer nitrogen container. The supplied nitrogen causes a continuous vibration of the valve due to intermittent operation of the valve, and the vibrating bubble can release the trie crystal and the fine element powder attached to the outer surface of the immersion membrane.

Example 1-10 The urea water producing apparatus of the present invention is the same as the apparatus for producing a urea water according to Example 1-1 except that a nitrogen supply portion 331 formed below the immersion membrane and forming a plurality of through holes 333, A nitrogen supply pipe 334 communicating with the nitrogen supply unit and having the other side connected to the nitrogen circulation pump 332, a lid 336 sealing the filter unit, one side formed in the filter unit lid, And a nitrogen recovery pipe 335 coupled to the pump.

The filter portion forms a sealed state. The upper part of the filter part is filled with nitrogen gas, and the lower part of the filter part is filled with the number of dissolving elements. The nitrogen gas at the top of the filter unit is supplied to the nitrogen supply unit through the pump to circulate the nitrogen. This is to prevent the carbon dioxide in the air from coming into contact with the dissolved urea water to react with the element and to recycle the nitrogen gas.

(Embodiment 2-1) The urea water producing apparatus of the present invention is characterized in that it comprises the urea water discharge pipe 411 which communicates with the inside of the immersion membrane and discharges the urea water, the ultrapure water generating apparatus 413 An ultrapure water supply pipe (412) for supplying ultrapure water; and a mixing tank (400) in which the urea water discharge pipe and the ultrapure water supply pipe communicate with each other.

The number of elements used is obtained by mixing high purity urea water and ultrapure water. The blending ratio applies a predetermined setting criterion. To ensure the number of elements used, the mixing tank mixes a certain percentage of high purity urea water and ultrapure water. The high-purity urea water uses the urea water obtained in the immersion membrane of the filter unit, and the ultrapure water uses ultra-pure water obtained from the ultrapure water generator. That is, the mixing tank is connected to the urea water discharge pipe and the ultrapure water supply pipe.

(Embodiment 2-2) The urea water producing apparatus of the present invention is the apparatus for producing urea water according to Embodiment 2-1, which includes a vortex generator 422 located inside the mixing tank and driven by a driving motor 421 Device.

High purity urea water and ultra pure water use a vortex generator inside the mixing tank. Inside the mixing tank, the blade of the vortex generator is positioned, and the rotation of the blades generates swirls to combine ultrapure water and high purity urea water. The blade of the vortex generator is driven by an external drive motor, and the number of revolutions and the direction of rotation of the drive motor can be adjusted as needed. Also, a plurality of blades are applied as needed. In addition to the vortex mixer, high-purity urea water and ultrapure water are diluted through an agitator or line mixer driven by a general motor.

(Example 2-3) A urea water producing apparatus according to Example 2-1 of the present invention comprises a urea water flow meter 431 and a urea water open / close valve 432 formed in the urea water discharge pipe; An ultrapure water flow meter 433 and an ultrapure water opening / closing valve 434, and a controller 435 for controlling the urea water opening / closing valve and the ultrapure water opening / closing valve according to the flow rate signals of the urea water flow meter and the ultrapure water flow meter.

The number of elements used is obtained by mixing high purity urea water and ultrapure water. To obtain the desired mixing ratio, the high concentration urea water and the ultra pure water amount are injected into the mixing tank at the correct ratio measured in the flow meter, which meters the flow meter signal and the controller controls the opening and closing valve.

(Embodiment 2-4) The urea water producing apparatus of the present invention includes the concentration measuring device 441 according to Embodiment 2-1, which measures the concentration of the diluting urea water in the mixing tank.

(Embodiment 2-5) The urea water producing apparatus of the present invention includes the density measuring device 442 according to Embodiment 2-1, which measures the density of the diluting urea water of the mixing tank.

(Embodiment 2-6) The urea water producing apparatus of the present invention includes the specific gravity measuring device 443 in Embodiment 2-1, which measures the specific gravity of the dilution factor number of the mixing tank.

The number of mixed elements to be used is measured in real time from the density meter, density meter, and specific gravity meter. When the set value is exceeded or exceeded, additional high concentration of urea and / or ultrapure water is adjusted to the set value.

(Embodiment 2-7) In Embodiment 2-1 to 2-6, the urea water producing apparatus of the present invention measures the measurement signals of the concentration measuring instrument, the density measuring instrument and the specific gravity measuring instrument in real time, And a PID controller 444 for driving the urea water on / off valve, the ultrapure water opening / closing valve, and the vortex generator according to the set value.

The concentration, density and specific gravity of the used urea water are measured in real time. If the measured value is exceeded or exceeded, the additional concentration of high concentration urea water and the amount of ultrapure water should be adjusted close to the set value. This is done in real time and controlled by the PID control technique.

(Embodiment 3-1) A urea water producing apparatus of the present invention is the apparatus for producing a urea water according to Embodiment 2-1, comprising: a diluting element water discharge pipe (501) communicating with the mixing tank and discharging diluted urea water; A refill filter (503) inserted into the dilution element water discharge pipe; And an ion filter (504).

The number of used elements obtained by mixing high purity urea water and ultrapure water is the number of diluted urea, and the number of diluting urea is stored in the storage tank through the discharge pipe. A purification filter and an ion filter are formed in the pipeline moving to the storage tank to finally remove foreign matter. The refining filter is to filter out the foreign matter in the water of the dilution element, and the ion filter removes the heavy metal in the dilution element water. The ion filter uses ion exchange resin ultrapure water. The ion exchange resin ultrapure water filter removes ions such as heavy metals while discharging hydrogen ions as cations and discharges hydroxide ions as anions to generate pure water finally so that no additional contaminants are generated.

(Embodiment 3-2) In the urea water producing apparatus of the present invention, the inlet port of the dilution element water discharge pipe is formed on the bottom surface of the mixing tank in Embodiment 3-1.

(Embodiment 3-3) In the urea water producing apparatus of the present invention, in Embodiment 3-1, the refining filter has a refining filter case 505 formed in the middle of the dilution element water discharge pipe, Wherein the plurality of elliptical elements are coupled to each other.

(Embodiment 3-4) The urea water producing apparatus of the present invention is the apparatus for producing a urea water according to Embodiment 3-1, wherein the ion filter is provided with an ion filter case 506 in the middle of the dilution element water discharge pipe, Wherein the plurality of elliptical elements are coupled to each other.

A purifier filter and an ion filter for purifying the dilution factor are formed in the dilution element water discharge pipe. Periodic replacement of the purification filter and the ion filter is required. Therefore, the case is formed in the dilution element water discharge pipe line, and the filter is inserted into the case.

(Example 4-1) The urea water producing method of the present invention comprises continuously introducing element and ultrapure water into a vessel (S100), a dissolving step (S200) in which elements are dissolved in ultrapure water after the charging step, And a stirring step (S300) of stirring the dissolved dissolution factor number.

Example 4-1 is a time-series method for continuously producing urea water at room temperature. Element and ultra pure water are continuously injected, and the deficit is replenished in real time. Contact between the element and ultrapure water produces dissolved element water. Increase the concentration of dissolved urea water as much as possible to increase the productivity in the stirring step. Since the number of dissolution factors is high, the viscosity is lowered in the stirring step. That is, the number of dissolving elements is continuously produced in the order of the continuous introduction step, the dissolution step, and the stirring step.

(Example 4-2) The urea water producing method of the present invention includes the first filtering step (S400) of separating the trie filtrate through the immersion membrane in the dissolving element water after the stirring step in Example 4-1 do.

The number of dissolution factors produced in Example 4-1 contains a large amount of triol. For tri-uret separation, the dissolving element water passes through the immersion membrane inside the filter section and extracts the high concentration urea water from which the trie is separated.

(Embodiment 4-3) The urea water producing method of the present invention includes the diluting step (S500) of mixing the water of dissolving element and the ultrapure water after the first filtering step in Embodiment 4-2.

The high concentration urea water that has passed through the immersion membrane is mixed with ultrapure water to produce the used urea water. High concentration urea water and ultrapure water are contained in the mixing tank at a certain ratio, and the two materials are mixed from the vortex generator in the mixing cooler. And the number of elements to be used is secured through the mixing process. A plurality of separate tanks are provided in order to secure a large number of used elements having different mixing ratios, and each mixing tank produces the used element water in various ratios.

(Example 4-4) The urea water producing method of the present invention is characterized in that in the method for producing urea water of the present invention, after the dilution step, an ion filter step of removing heavy metals and a second filter step of refining step of diluting urea water (S600).

The number of elements used may contain heavy metals. The heavy metal is removed through an ion filter process to remove heavy metals. The ion filter stage passes through the ion exchange resin ultrapure water filter, removes heavy metals, and separates the hydrogen and hydroxide inside the ultrapure water to form a state of high purity water.

The number of elements used can be determined by the external temperature. A purification step is performed to separate the determined elements. The purification step separates the element crystallized by the filter membrane. The number of elements used can be set in the next step of the ion filter to purify other turbid substances such as turbid substances that can come out of the ion exchange resin.

(Embodiment 4-5) The urea water producing method of the present invention includes the storing step (S700) of storing the dilution factor number after the second filtering step in Embodiment 4-4.

The number of dilution factors mixed at a certain ratio of high pure water and ultra pure water is stored in a separate storage container. The number of dilution factors with different dilution ratios to produce multiple products from one production system is stored separately in separate storage containers.

(Embodiment 4-6) The urea water producing method of the present invention includes the urea water supplying step (S110) according to Embodiment 4-1, wherein the stirring step supplies the number of dissolving elements to the continuous introduction step again.

In order to secure a high concentration of urea water, the number of dissolution factors obtained in the stirring step of Example 4-1 is put into the element space. The number of dissolving elements in the stirring space is injected into the element space through the pump, and the injection speed and injection direction are controlled to produce high concentration urea water.

(Example 4-7) The urea water producing method of the present invention is characterized in that in the method of producing a urea water according to the embodiment 4-2, after the first filtering step, the nitrogen bubbles are brought into contact with the immersion membrane to separate the trieret attached to the immersion membrane (S410).

The high concentration urea water contains trie. The high concentration urea water is passed through the immersion membrane for tri-uret separation, but the separated triuret attaches to the outer surface of the immersion membrane causing a problem of closing the immersion membrane. Nitrogen gas bubbles supplied from the outside are used for solving the above problems. The nitrogen gas bubble collides with the immersion membrane to separate the trierlet attached to the immersion membrane surface.

(Examples 4-8) The urea water producing method of the present invention is the same as the method of producing a urea water according to the embodiment 4-2, wherein after the first filtering step, a backwashing step S420).

In order to separate the trierot attached to the surface of the immersion membrane, hot water is injected into the immersion membrane, and the trierite is dissolved and desorbed by the solubility. This is based on the principle that solubility increases at high temperatures. The nozzle is used for high-speed injection, and the nozzle is repeatedly oscillated for a certain range to extend the separation range. For efficient separation, the temperature of the reverse wastewater is heated to 40 degrees Celsius.

(Example 4-9) The urea water producing method of the present invention is the method of producing the urea water according to Example 4-3, wherein the concentration, the density and the specific gravity are measured after the dilution step and the ultrapure water and the dissolution factor are re- And a fine dilution step (S510) of mixing and mixing.

Ultrapure water and high concentration urea water are diluted at a certain ratio, but the accurate dilution rate can be verified by the measurement process. Density, density and specific gravity are measured to determine the correct dilution ratio. When the dilution ratio is less than or exceeds the set value, the ultrapure water and / or high concentration urea water is added to produce the set value.

100: stirring vessel 110: perforated plate
101: ultrapure water supply pipe 120: ultrapure water storage container
121: Input ball 122:
200: stirrer 211: electric motor
212: rotating shaft 213: wing
221: Inlet port 222: Outlet port
223: Submersible pump 231: Inlet port
232: outlet 233: mild pump
300: filter unit 321: nitrogen supply unit
322: Nitrogen container 323: Through hole
331: nitrogen supply part 332: nitrogen circulation pump
333: Through hole 334: Nitrogen supply pipe
335: nitrogen recovery pipe 336: cover
400: mixing tank 411: urea water outlet pipe
412: ultrapure water supply pipe 413: ultrapure water generating device
421: Driving motor 422: Vortex generator
431: Urea number flow meter 432: Number of elements opening / closing valve
433: Ultrapure water flow meter 434: Ultrapure water opening / closing valve
435: Controller 441: Concentration meter
442: density measuring instrument 443: specific gravity measuring instrument
444: PID controller 501: dilution element water outlet pipe
503: ion filter 504: refined filter
505: ion filter case 506: refined filter case

Claims (4)

An agitating vessel 100 in which a perforated plate 110 is formed to separate the element space S1 and the agitation space S2;
An ultrapure water supply pipe 101 located above the element space S1 to supply ultrapure water to the element space, and ultrapure water contacting the element while flowing through the element space to dissolve the element at room temperature;
An agitator 200 accommodated in the stirring space S2;
An electric motor 211 outside the agitator, a rotary shaft 212 having one side connected to the electric motor and the other side formed in the stirring space, and a plurality of wings 213 connected to the other side of the rotary shaft;
And a filter unit (300) communicating with the stirring space (S2) and accommodating the immersion membrane (310).
The method according to claim 1,
A urea water discharge pipe 411 communicating with the interior of the immersion membrane and discharging urea water;
An ultrapure water supply pipe 412 for supplying ultrapure water from the ultrapure water generating device 413;
And a mixing tank (400) in which the urea water discharge pipe and the ultrapure water supply pipe communicate with each other.
The method of claim 2,
A dilution element water discharge pipe (501) communicating with the mixing tank and discharging dilution urea water;
A storage tank 502 into which the diluent element water discharge pipe is introduced;
A purifying filter (503) inserted into the dilution element water discharge pipe; And an ion filter (504).
Continuously injecting the element and ultrapure water continuously into the vessel (S100);
A dissolution step (S200) in which the element is dissolved in the ultrapure water after the charging step;
A stirring step (S300) of stirring the dissolving element water;
After the stirring step, a first filter step (S400) of separating the trie filtrate through the immersion membrane of the dissolved urea water;
A dilution step (S500) of mixing the number of dissolving elements and ultrapure water after the first filtering step;
A second filter step (S600) consisting of an ion filter step for removing heavy metals and a purification step for refining the dilution factor water after said dilution step.

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