KR101915741B1 - Urea ammonia transformming device and urea scr system using of the same - Google Patents

Abstract

It is an object of the present invention to provide a urea water conversion apparatus which secures a reaction time in which the number of urea gases to be injected stays in a high temperature zone and reduces the energy cost required for raising the temperature of the exhaust gas and the apparatus. The urea water ammonia conversion apparatus according to an embodiment of the present invention includes a housing installed in the middle of an exhaust pipe for discharging exhaust gas at a high temperature, a high temperature portion provided in the flow direction of exhaust gas from the inside of the housing, And a urea water nozzle which is provided in the housing and injects urea water into the inside of the partition member, wherein the partition member guides the injected urea water to the central high temperature portion of the housing, .

Description

TECHNICAL FIELD [0001] The present invention relates to an urea-ammonia conversion apparatus, and more particularly, to a Urea ammonia conversion system and a Urea SCR system using the same.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an urea water conversion system and a urea water system using the same. More particularly, the present invention relates to a urea water conversion system for converting urea water into ammonia Device and an elliptical sensor system using the same.

In general, selective catalytic reduction (SCR) is being applied to remove nitrogen oxides (NOx). A reducing agent is required for the SCR reaction. Ammonia (ammonia water) or urea (urea water) is used as a reducing agent in the industrial field.

Ammonia water has a safety problem in transportation and storage. Therefore, urea is frequently used as a reducing agent in moving sources such as automobiles and ships. The urea water is hydrolysed at high temperature and converted to ammonia.

A high temperature environment above 350 ° C must be maintained for rapid conversion of urea to ammonia. However, if the temperature is not sufficiently high in the area where the urea water is sprayed, the urea water is converted into a solid ammonium salt through the chemical reaction and accumulated in the urea water nozzle and the exhaust pipe supplying urea water.

If this phenomenon persists, there will be a problem in the urea supply system. The temperature distribution in the urea nozzle and the exhaust pipe to supply the urea water is very important. It is necessary to design the exhaust pipe so that the surface temperature of the exhaust pipe to which urea water is supplied is maintained at least 280 캜. However, maintaining a high surface temperature of the apparatus including the exhaust gas and the exhaust pipe involves a high energy cost.

It is an object of the present invention to provide a urea water conversion apparatus which secures a reaction time in which the number of urea gases to be injected stays in a high temperature zone and reduces the energy cost required for raising the temperature of the exhaust gas and the apparatus.

It is another object of the present invention to provide a Urethane silane system in which ammonia converted from urea water is supplied to an exhaust gas by applying the urea water ammonia conversion apparatus to effectively remove nitrogen oxides (NOx).

The urea water ammonia conversion apparatus according to an embodiment of the present invention includes a housing installed in the middle of an exhaust pipe for discharging exhaust gas at a high temperature, a high temperature portion provided in the flow direction of exhaust gas from the inside of the housing, And a urea water nozzle which is provided in the housing and injects urea water into the inside of the partition member, wherein the partition member guides the injected urea water to the central high temperature portion of the housing, .

Wherein the partition member includes a first pipe installed in the housing in the flow direction and having an inlet for introducing urea water injected from the urea water nozzle, and a second pipe installed in the flow pipe in the flow direction And a second pipe.

Wherein the first pipe is spaced apart from the end of the second pipe by a predetermined distance D in the flow direction and protrudes at an interval G set inwardly in the radial direction of the housing to induce a number of elements injected into the center of the housing, And the like.

The plurality of second pipelines may be installed to be spaced apart from each other in the flow direction, and the double draw may guide the injected urea water into the spaced apart second pipelines.

The second pipe may further include a convex protrusion toward the inlet.

The inlet may have a first diameter, and the protrusion may have a second diameter that is greater than the first diameter.

The partition member may be installed in the flow direction inside the housing and may form a spiral structure in a cross section in the radial direction of the housing.

The partition member may form a passage with a uniform area in the flow direction of the housing.

The partition member may form a passage with an area gradually narrowed in the flow direction of the housing.

The plurality of partition members may be provided at predetermined intervals in the flow direction of the housing.

According to an embodiment of the present invention, there is provided an elliptical sill system including: an exhaust pipe for flowing an exhaust gas; a burner for generating a flame with fuel and air supplied to the exhaust pipe; A catalytic reduction (SCR) catalyst, and an exhaust pipe between the burner and the SCR catalyst along the flow direction, the interior of the housing being partitioned into a high temperature portion at the center and a low temperature portion at the periphery, The urea water is injected into the high temperature exhaust gas via the urea water nozzle, the injected urea water is guided to the high temperature part by the partition member, the ammonia converted from the urea water is mixed with the exhaust gas, And a urea water supply ammonia conversion device.

The partition member may be provided at least in the flow direction to guide the injected urea water at least once in the flow direction.

The partition member may be provided at least in the flow direction to guide the sprayed urea water at least once in the radial direction of the housing.

As described above, according to an embodiment of the present invention, the housing is divided into a high-temperature section and a low-temperature section by the partitioning member, and the urea water injected by the urea water nozzle is led to the high- It can be secured for a long time. Therefore, for the elliptical decomposition, the energy cost for forming the high-temperature environment inside the housing can be reduced.

That is, since the partition member keeps the injected urea water in the high temperature portion for a long time, the reaction of decomposing urea water into ammonia can be accelerated. Therefore, one embodiment of the present invention can effectively remove nitrogen oxides (NOx) from the SCR catalyst by supplying ammonia converted from the urea water to the exhaust gas.

1 is a configuration diagram of an ellipsometer system according to an embodiment of the present invention.
2 is a cross-sectional view of the urea water ammonia conversion device according to the first embodiment applied to FIG.
3 is a graph showing the temperature distribution in the urea water ammonia conversion apparatus of FIG.
4 is a cross-sectional view of the urea water ammonia conversion apparatus according to the second embodiment of the present invention.
5 is a cross-sectional view taken along the line V-V in Fig.
6 is a cross-sectional view of the urea water ammonia conversion device according to the third embodiment of the present invention.
7 is a cross-sectional view of the urea water ammonia conversion device according to the fourth embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

1 is a configuration diagram of an ellipsometer system according to an embodiment of the present invention. Referring to FIG. 1, the urea-Sulfur system of one embodiment includes an exhaust pipe 10, a burner 20, a selective catalytic reduction (SCR) catalyst 30 and a urea water ammonia conversion device 1.

The exhaust pipe (10) flows hot exhaust gas. For example, the exhaust pipe 10 exhausts and flows the exhaust gas generated in the industrial field, the exhaust gas generated in the automobile and the engine of the ship.

The burner 20 is installed in the exhaust pipe 10 and supplies fuel and air to one side to form a flame to raise the temperature of the exhaust gas to a high temperature condition (for example, 350 ° C or more). The high temperature condition of the exhaust gas allows the urea water ammonia conversion device 1 to decompose urea water and convert it into ammonia.

The burner 20 may not operate if the exhaust gas flowing into the burner 20 is at a high temperature sufficiently raised to hydrolyze urea water into ammonia. Since the burner 20 may be variously constructed, a detailed description thereof will be omitted.

The selective catalytic reduction (SCR) catalyst 30 is installed in the exhaust pipe 10 at the rear of the burner 20 and uses the converted ammonia as a reducing agent to selectively remove NOx contained in the exhaust gas Nitrogen (N2). Thus, the exhaust gas from which the nitrogen oxide is removed can be discharged to the exhaust pipe 10.

For this purpose, the urea water ammonia conversion device 1 is installed in an exhaust pipe 10 between the burner 20 and the SCR catalyst 30 and is connected to a high temperature exhaust gas heated by a high temperature flame discharged from the burner 20 The number of urea is sprayed, and the number of urea is hydrolyzed to convert it to ammonia.

The ammonia converted from the urea water is mixed with the high temperature exhaust gas and supplied to the SCR catalyst 30. Thus, the converted ammonia acts as a reducing agent in the SCR catalyst 30 to remove nitrogen oxides contained in the exhaust gas.

In the urea water ammonia conversion apparatus 1, the partition member 12 is provided at least in the flow direction to guide the injected urea water at least once in the flow direction. The urea water introduced in the flow direction by the partition member 12 is led to the high temperature portion P1 and flows (see FIG. 2).

Therefore, the energy cost required to raise the temperature of the exhaust gas and the urea water ammonia conversion apparatus 1 is reduced. The urea water system can effectively remove nitrogen oxides (NOx) by supplying ammonia to the exhaust gas.

In the urea water ammonia conversion apparatuses 2, 3 and 4, the partition members 22, 32 and 32 are provided in at least one in the flow direction so that the injected urea water flows in the radial direction of the housing 21, 31, . The number of urea radially guided by the partitioning members 22, 32 and 32 is concentrated and guided to the high temperature portions P3, P5 and P5 (see FIGS. 4, 6 and 7).

Therefore, the energy cost required for raising the temperature of the exhaust gas and the urea water conversion apparatuses 2, 3, 4 is further reduced. The urea water system can supply ammonia to the exhaust gas to more effectively and massively remove nitrogen oxides (NOx).

2 is a cross-sectional view of the urea water ammonia conversion device according to the first embodiment applied to FIG. Referring to Fig. 2, the urea water conversion apparatus 1 of the first embodiment injects urea water into the hot exhaust gas flowing through the exhaust pipe 10, converts the urea water into ammonia by hydrolysis, A partition member 12 and a urea water nozzle 13 so as to supply ammonia and exhaust gas to the SCR catalyst 30. As shown in Fig.

The housing 11 is installed in the middle of the exhaust pipe 10 for exhausting the high-temperature exhaust gas via the burner 20. That is, the housing 11 is connected to the exhaust pipe 10 provided with the burner 20 forward and to the exhaust pipe 10 provided with the SCR catalyst 30 to the rear. Therefore, the high-temperature exhaust gas passed through the burner 20 is supplied to the SCR catalyst 30 together with the ammonia converted in the housing 11 via the housing 11.

The partition member 12 is installed along the flow direction of the exhaust gas (the left-right direction in FIG. 2) inside the housing 11. Therefore, the inside of the housing 11 is partitioned by the partition member 12 into the high temperature portion P1 at the center and the low temperature portion P2 at the periphery. The partition member 12 also guides the injected urea water to the high temperature part P1 in the center of the housing 11 in the radial direction and discharges it to the outside of the partition member 12,

The urea water nozzles 13 are provided in the housing 11 and inject urea water into the inside of the partitioning member 12. For this, the partition member 12 includes a first pipe 121 and a second pipe 122 having a double pipe structure, which is installed inside the housing 11.

3 is a graph showing the temperature distribution in the urea water ammonia conversion apparatus of FIG. 3, the inside of the partitioning member 12 forms a high temperature portion P1 at the radial center of the housing 11, and the outside of the partitioning member 12 and the inside wall of the housing 11 are connected to each other The low temperature portion P2 is formed in the outer periphery of the housing 11 in the radial direction.

The space P11 between the first pipe 121 and the second pipe 122 in the high temperature portion P1 forms a lower temperature distribution than the internal space P12 of the second pipe 122. [ That is, the housing 11 forms a minimum temperature outside the radial direction, and a maximum temperature at the center. Therefore, the partition member 12 guides the urea water to the inner space portion P12 which forms the maximum temperature as much as possible.

2, the first pipe 121 is installed in the flow direction (the left-right direction in FIG. 2) away from the inner wall of the housing 11 inside the housing 11, and is connected to the urea water nozzle 13 And an inlet 123 for introducing the number of injected elements. Therefore, the number of urea injected from the urea water nozzle 13 is supplied to the high temperature portion P1 inside the first pipe 121 via the inlet 123.

The second pipe 122 is installed in the flow direction (the left-right direction in FIG. 2) so as to be spaced apart from the inner wall of the first pipe 121 in the first pipe 121. The second pipe 122 has a protrusion 124 which is convex toward the inlet 123. The number of urea passing through the inlet 123 collides with the protrusion 124 and is exposed to the long residence time while reciprocating in the space P11 between the first and second pipes 121 and 122.

The number of collisions in the space P11 between the first and second pipes 121 and 122 can be increased depending on the size of the droplet of the number of jections to be injected. Therefore, the number of urea can be raised at a high temperature for a longer time.

The urea water injected from the urea water nozzle 13 is supplied to the space P11 between the first and second pipes 121 and 122 through the inlet 123 and heated by the higher temperature exhaust gas, . The number of urea passing through the inlet 123 collides with the protrusion 124 and is radially reciprocated in the space P11 between the first and second pipes 121 and 122, It is further heated by the gas to be converted into ammonia.

The inlet 123 has a first diameter D1 and the protrusion 124 has a second diameter D2 that is greater than the first diameter D1. The number of urea injected from the urea water nozzle 13 flows into the interior of the first pipe 121 at a small first diameter D1 of the inlet port 123 and reaches the second large diameter D2 of the protrusion 124, And can stay in the space P11 between the first and second pipes 121 and 122 for a long time without bouncing out of the inlet 123. [ That is, the reaction time for conversion from urea water to ammonia can be secured.

The first pipe 121 and the second pipe 122 may be provided in the housing 11 along the flow direction. In the first embodiment, one first pipe 121 is formed to be long inside the housing 11, and a plurality of second pipes 122 are spaced apart in the flow direction inside the first pipe 121 I have installed.

The first pipe 121 further includes a cup 125 protruding toward the second pipe 122. The tube 125 is spaced apart from the end of the second pipe 122 by a predetermined distance D and protrudes inward in the radial direction of the housing 11 so as to be spaced apart from the end of the second pipe 122 by a predetermined gap G ).

The distance D and the interval G set between the end of the second pipe 122 and the fold 125 collide with the protrusion 124 and the space P11 between the first and second pipes 121 and 122 ) To the center of the high temperature portion P1, that is, the space portion P12.

That is, the distance D and the gap G collide with each other, and the number of elements passing through the space P11 between the first and second pipes 121, (P12), thereby further facilitating the conversion reaction to ammonia.

Therefore, the number of ellipses that collide with the belly 125 and pass through the distance D and the gap G can be further converted to hydrolysis and ammonia by being exposed to a longer residence time at the high temperature portion P1.

The first and second pipes 121 and 122 guide the urea water injected from the urea water nozzle 13 to the high temperature part P1 higher than the temperature of the outer surface of the housing 11 and expose the urea water to the high temperature part P1, It is possible to prevent the formation of solid-state by-products such as ammonium on the inner surface of the substrate 11.

Hereinafter, various embodiments of the present invention will be described. For the sake of convenience, the same configuration will be omitted and different configurations will be described in comparison with the first embodiment and the previously described embodiments.

4 is a cross-sectional view of the urea water ammonia conversion apparatus according to the second embodiment of the present invention, and FIG. 5 is a sectional view taken along the line V-V of FIG. 4 and 5, in the urea water ammonia conversion device 2 of the second embodiment, the partition member 22 is installed inside the housing 21 in the flow direction and has a cross section in the radial direction of the housing 21 To form a helical structure.

The inside of the partition member 22 forms the high temperature portion P3 at the center of the housing 21 and the outside of the partition member 22 forms the low temperature portion P4 outside the housing 21. [ The helical structure collides the urea water injected from the urea water nozzle 23 with the partition member 22 to lead the water to the center of the partition member 22 and the housing 21 and the residence time of the urea water at the high temperature portion P3 .

The partition member 22 forms a passage having a uniform area in the flow direction of the housing 21 (the lateral direction in Fig. 4). Therefore, the urea water which is guided to the center flows to the high-temperature part P3 while being flowed in the flow direction by the high-temperature exhaust gas and is heated to be converted into ammonia.

The partition member 22 may further include a protrusion 224 projecting toward the urea water nozzle 23. When a plurality of elliptical nozzle nozzles 23 are provided, a plurality of protruding portions 224 may be provided to correspond to each elliptical nozzle.

The protruding portion 224 collides with the number of jects ejected from the urea water nozzle 23 to further induce the core portion to the high temperature portion P3 along the spiral structure to further increase the amount of urea water remaining in the high temperature portion P3 have.

Therefore, the urea water impinging on the partition member 22 and the protruding portion 224 and guided to the center can be exposed to the longer residence time at the high temperature portion P3, and can further be converted into hydrolysis and ammonia.

The partition member 22 guides the urea water injected from the urea water nozzle 23 to the high temperature section P3 higher than the temperature of the outer surface of the housing 21 and exposes the high temperature section P3 to the high temperature section P3, It is possible to prevent the generation of by-products of solid phase such as ammonium.

6 is a cross-sectional view of the urea water ammonia conversion device according to the third embodiment of the present invention. Referring to Fig. 6, in the urea water ammonia conversion apparatus 3 of the third embodiment, the partition member 32 forms a passage with an area gradually narrowed in the flow direction of the housing 31. Fig.

The inside of the partition member 32 forms the high temperature portion P5 and the outside forms the low temperature portion P6. The spiral structure collides the urea water injected from the urea water nozzle 33 with the partition member 32 to guide the water to the center of the partition member 32 and the housing 31. The residence time of the urea water in the high temperature portion P5 .

The injected urea water is guided in the flow direction by the flow path of the hot exhaust gas to the high temperature section P5 at the center by the partition member 32 of the spiral structure and is concentrated in the center of the partition member 32 and the housing 31 . Therefore, the number of urea is intensively exposed in the highest temperature region of the high temperature portion P5, so that it can be more easily heated up and decomposed into ammonia.

7 is a cross-sectional view of the urea water ammonia conversion device according to the fourth embodiment of the present invention. Referring to Fig. 7, in the urea water ammonia conversion device 4 of the fourth embodiment, a plurality of partition members 32 are provided and are spaced apart from each other at a predetermined interval G4 in the flow direction of the housing 41. Fig.

A plurality of partition members 32 are provided in the housing 41, and elliptical water nozzles 33 are provided in the partition members 32. Therefore, the number of elements injected from each urea water nozzle 33 is guided to the central high temperature portion P5 together with the exhaust gas by each of the partition members 32 of the helical structure arranged in series.

The number of urea is sequentially guided along the flow direction by the plurality of partition members 32 in the housing 31. Therefore, the urea water conversion apparatus 4 of the fourth embodiment can be effectively applied to a large-scale conversion of a large amount of urea water into a large amount of ammonia.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, And it goes without saying that the invention belongs to the scope of the invention.

1, 2, 3, 4: number of urea ammonia conversion device 10: exhaust pipe
11, 21, 31, 41: housing 12, 22, 32: partition member
13, 23: number of urea nozzles 20: burner
30: selective catalytic reduction (SCR) catalyst 121: first piping
122: second piping 123: inlet
124, 224: protrusion 125:
D: distance D1: first diameter
D2: second diameter P1, P3, P5:
P2, P4, P6: low temperature portions P11, P12:
G: spacing G4: spacing

Claims (13)

A housing installed in the middle of an exhaust pipe for exhausting a high temperature exhaust gas;
A partition member installed in the flow direction of the exhaust gas in the housing and partitioning the inside of the housing into a high temperature portion around the inside and a low temperature portion outside the housing; And
A plurality of elliptical nozzles disposed in the housing for spraying urea water into the inside of the partitioning member,
/ RTI >
The partition member
The number of injected elements is guided to the central high temperature portion of the housing and discharged,
The partition member
A first pipe arranged in the flow direction inside the housing,
And a second pipe installed inside the first pipe,
Wherein the first conduit further comprises a doublet,
The second pipe
A plurality of the first and second flow passages,
The double-
And directs the injected urea water to the interior of the second pipeline. The method according to claim 1,
The first pipe
And an inlet for introducing the urea water injected from the urea water nozzle,
The second pipe
And the flow direction of the urea water. 3. The method of claim 2,
The double-
A number of urea nozzles spaced a predetermined distance D from the end of the second pipe in the flow direction and projecting at an interval G set inwardly in the radial direction of the housing to induce a number of urea injected into the center of the housing; Device. delete A housing installed in the middle of an exhaust pipe for exhausting a high temperature exhaust gas;
A partition member installed in the flow direction of the exhaust gas in the housing and partitioning the inside of the housing into a high temperature portion around the inside and a low temperature portion outside the housing; And
A plurality of elliptical nozzles disposed in the housing for spraying urea water into the inside of the partitioning member,
/ RTI >
The partition member
Guiding the injected urea water to the central high temperature part of the housing and discharging it,
The partition member
A first pipe provided in the housing in the flow direction and having an inlet for introducing urea water injected from the urea water nozzle;
A second pipe arranged in the flow direction inside the first pipe,
/ RTI >
The second pipe
Further comprising a convex protrusion toward said inlet port. 6. The method of claim 5,
Said inlet having a first diameter,
Wherein the protrusion has a second diameter greater than the first diameter. delete delete A housing installed in the middle of an exhaust pipe for exhausting a high temperature exhaust gas;
A partition member installed in the flow direction of the exhaust gas in the housing and partitioning the inside of the housing into a high temperature portion around the inside and a low temperature portion outside the housing; And
A plurality of elliptical nozzles disposed in the housing for spraying urea water into the inside of the partitioning member,
/ RTI >
The partition member
Guiding the injected urea water to the central high temperature part of the housing and discharging it,
The partition member
Wherein the housing is provided in the flow direction inside the housing and forms a spiral structure in a cross section in the radial direction of the housing,
The partition member
And forms a passage with an area gradually narrowed in the flow direction of the housing. A housing installed in the middle of an exhaust pipe for exhausting a high temperature exhaust gas;
A partition member installed in the flow direction of the exhaust gas in the housing and partitioning the inside of the housing into a high temperature portion around the inside and a low temperature portion outside the housing; And
A plurality of elliptical nozzles disposed in the housing for spraying urea water into the inside of the partitioning member,
/ RTI >
The partition member
Guiding the injected urea water to the central high temperature part of the housing and discharging it,
The partition member
Wherein the housing is provided in the flow direction inside the housing and forms a spiral structure in a cross section in the radial direction of the housing,
The partition member
Wherein the plurality of ammonia supply units are installed at predetermined intervals in the flow direction of the housing. An exhaust pipe for flowing the exhaust gas;
A burner installed in the exhaust pipe to generate a flame with fuel and air supplied thereto;
A selective catalytic reduction (SCR) catalyst installed in the exhaust pipe at the rear of the burner; And
A step of injecting urea water into the high temperature exhaust gas passed through the burner, mixing the ammonia converted from the injected urea water with the exhaust gas, SCR catalyst according to any one of claims 1, 2, 3, 5, 6, 9 and 10,
The number of elements containing the SIS system. 12. The method of claim 11,
The partition member
At least one in the flow direction to guide the injected urea water at least once in the flow direction. 13. The method of claim 12,
The partition member
At least one in the flow direction to guide the injected urea water at least once in the radial direction of the housing.

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