CN215086985U - Urea pyrolysis furnace adopting cyclone device - Google Patents
Urea pyrolysis furnace adopting cyclone device Download PDFInfo
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- CN215086985U CN215086985U CN202121296037.5U CN202121296037U CN215086985U CN 215086985 U CN215086985 U CN 215086985U CN 202121296037 U CN202121296037 U CN 202121296037U CN 215086985 U CN215086985 U CN 215086985U
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- pyrolysis furnace
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- urea pyrolysis
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- 238000000197 pyrolysis Methods 0.000 title claims abstract description 53
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 52
- 239000004202 carbamide Substances 0.000 title claims abstract description 52
- 239000011159 matrix material Substances 0.000 claims abstract description 3
- 239000007921 spray Substances 0.000 claims description 11
- 230000007704 transition Effects 0.000 claims description 10
- 239000007788 liquid Substances 0.000 abstract description 12
- 238000002425 crystallisation Methods 0.000 abstract description 7
- 230000008025 crystallization Effects 0.000 abstract description 7
- 239000000243 solution Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 235000011114 ammonium hydroxide Nutrition 0.000 description 2
- 238000000889 atomisation Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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Abstract
The utility model discloses a urea pyrolysis furnace adopting a cyclone device, belonging to the technical field of urea pyrolysis, comprising a first gradually expanding section, a second gradually expanding section, a main body section and an outlet section which are sequentially connected from top to bottom, and a cyclone device fixed in the first gradually expanding section; the cyclone device comprises a cylindrical air inlet pipe and a plurality of guide vanes, wherein a matrix is formed by circumferentially and uniformly distributing the guide vanes, each guide vane is arranged outside the cylindrical surface extending downwards of the air inlet pipe in a tangential manner, a long edge of each guide vane is positioned on the cylindrical surface, the upper end of the long edge is connected to the lower end of the air inlet pipe, and the lower end of the long edge is connected to a ring. The utility model discloses a whirl device makes the hot-air form high-speed whirl at the oven, makes urea liquid drop spout difficult in the oven adhesion behind the furnace body, and the whirl drives urea liquid drop and stops more time in the stove, contacts with the hot-air more fully to guarantee that the urea pyrolysis is complete, solve the problem that pyrolysis device urea solution adhesion crystallization and dwell time are too short on the oven.
Description
Technical Field
The utility model belongs to the technical field of the urea pyrolysis, especially, relate to an adopt whirl device's urea pyrolysis oven.
Background
SCR is a widely applied power plant flue gas denitration method at present, and reducing agents of conventional SCR comprise liquid ammonia, ammonia water and urea, wherein the liquid ammonia and the ammonia water are most widely applied in SCR denitration.
The decomposition of urea is mainly carried out in a pyrolysis reactor, hot air enters from an inlet section, urea is injected into the hot air through an injector for providing complete distribution to react, and the pyrolysis reactor comprises an inlet section, an amplifying section, a main body, a contraction section, an outlet and the like. In the traditional pyrolysis reactor design, the method of enlarging the diameter of the main body is adopted to meet the requirement of the residence time of the pyrolysis reaction, and has certain limitation.
The main defects of the existing urea pyrolysis device are urea crystallization, uneven flow field inside the pyrolysis furnace, out-of-control temperature field, low furnace wall temperature or low furnace wall speed compared with the furnace center, which causes urea solution to adhere to the furnace wall for crystallization, so that the furnace wall speed and temperature are increased to prevent crystallization.
The main defects of the existing urea pyrolysis device are that the residence time of the pyrolysis reaction is insufficient, sufficient residence time can ensure that the urea solution is completely decomposed in the pyrolysis furnace, the mode of increasing the residence time is currently applied, the height of the pyrolysis device is increased or the flowing mode of gas in the device is changed into rotational flow from the traditional longitudinal direct flowing. Simply increasing the height of the pyrolysis device increases the difficulty of site layout, increases investment cost and maintenance cost, and cannot fundamentally solve the problem of residence time, and measures such as a rotational flow plate which is reasonably arranged can be adopted to achieve the purpose.
SUMMERY OF THE UTILITY MODEL
In view of the above, the utility model provides an adopt urea pyrolysis oven of whirl device, adopt the whirl device to carry out the whirl to the hot-air that gets into for the hot-air forms high-speed whirl at the oven, oven speed is higher than the speed in the middle of the furnace body, and urea liquid drop is difficult for adhering at the oven after spouting into the furnace body, thus the crystallization; and the rotational flow drives urea liquid drops to stay in the furnace for more time and to be more fully contacted with hot air so as to ensure complete urea pyrolysis and solve the problems that the urea solution of the pyrolysis device is adhered to the furnace wall to be crystallized and the stay time is too short.
In order to achieve the above object, the utility model provides a following technical scheme:
a urea pyrolysis furnace adopting a rotational flow device comprises a first gradually-expanding section, a second gradually-expanding section, a main body section, an outlet section and the rotational flow device fixed in the first gradually-expanding section, wherein the first gradually-expanding section, the second gradually-expanding section, the main body section and the outlet section are sequentially connected from top to bottom; the rotational flow device comprises a cylindrical air inlet pipe and a plurality of guide vanes; the upper end of the air inlet pipe is connected with the air inlet, and the lower end of the air inlet pipe is connected with the guide vane; the guide vanes are evenly distributed in the circumferential direction to form a matrix, each guide vane is tangentially distributed outside a cylindrical surface extending downwards of the air inlet pipe, a long edge of each guide vane is located on the cylindrical surface, the upper end of the long edge is connected to the lower end of the air inlet pipe, and the lower end of the long edge is connected to a ring.
Furthermore, the divergence angle (the included angle between the generatrix of the circular truncated cone and the axis) of the second divergent section is smaller than that of the first divergent section, and the divergence angle between the first divergent section and the second divergent section is between 20 and 90 degrees.
Furthermore, a transition section is connected between the first divergent section and the second divergent section, the transition section is a cylindrical shell, and the height of the transition section is less than 1500 mm.
Further, the swirling device is fixed in the first diverging section and the transition section, and is fixed through a structure.
Furthermore, the number of the guide vanes of the cyclone device is 4-12, and the length is 200-500 mm.
Furthermore, the rotational flow device also comprises a small cylinder which is fixed at the axis of the cylindrical surface extending downwards of the air inlet pipe through a structure. The small cylinder is closed at both ends for flow distribution and can be omitted when the pressure drop of the pyrolysis furnace does not need to be reduced or the swirling effect does not need to be reduced.
Furthermore, the diameter of the small cylinder is 100-200 mm.
Further, the ratio of the diameter to the height of the main body section is 1: 5-1: 10.
Furthermore, the inner wall of the shell of the main body section is circumferentially and uniformly provided with spray guns with downward nozzles, the positions of the spray guns are 1/3-1/5 from top to bottom of the main body section, and the number of the spray guns is 4-8.
Furthermore, the bottom surface of the outlet section is also connected with a cylindrical pipe, and the lower end of the cylindrical pipe is an outlet.
The utility model discloses a urea pyrolysis oven's advantage lies in: hot air enters from an air inlet pipe at the upper part of the pyrolysis furnace, guide vanes are tangentially arranged outside the air inlet pipe, and a small cylinder can be further arranged in the middle of the air inlet pipe for shunting. When hot air flows out of the air inlet pipe, one part of the hot air flows out in a rotational flow mode by arranging blades tangentially along the outside of the air inlet pipe, and the other part of the hot air flows out of the small cylinder, so that the rotational flow of the air is ensured, and the problem of overhigh pressure drop caused by changing the flow direction of the smoke is solved. The cyclone device makes hot air enter the pyrolysis furnace in a cyclone mode, the air flow drives the urea solution to move in a cyclone mode, the residence time of the urea solution in the pyrolysis furnace is prolonged, the urea solution is fully pyrolyzed, the speed of the inner wall surface of the pyrolysis furnace is always higher than the speed of the inner wall surface of the pyrolysis furnace, the problem of being stained with the wall can be effectively solved, and the overall performance of a pyrolysis system is greatly improved. The distribution of the flow field and the temperature field in the pyrolysis furnace is more uniform, the problem of crystallization of urea on the wall of the pyrolysis furnace is solved, and the urea solution is decomposed more thoroughly. In order to prevent the pressure drop from being too high, the small cylinder is arranged in the middle of the air inlet pipe for shunting, and the air inlet device with the blades and the small cylinder arranged in the tangential direction can greatly prolong the retention time of urea in the pyrolysis device, improve the mass and heat transfer effects and effectively reduce the urea crystallization and blockage phenomena through the demonstration of numerical simulation results.
Drawings
In order to more clearly illustrate the embodiments and technical solutions of the present invention, three drawings are provided to explain the principles thereof, and the drawings are briefly described below.
The drawings in the present invention are only schematic diagrams, and the structures, sizes, etc. drawn in the drawings are only used for cooperating with the content explained in the specification, and do not constitute improper limitation to the present invention, so the modification of any structure, the change of the proportional relation, the adjustment of the size, under the similar purpose of the present invention, all belong to the protection scope included in the present invention.
FIG. 1 is a schematic structural view of an embodiment of a pyrolysis furnace provided by the present invention;
FIG. 2 is an enlarged view of a portion of the arrangement of the swirling air inlet device in the pyrolysis furnace shown in FIG. 1;
fig. 3 is a detailed view of a swirling air intake apparatus in the pyrolysis furnace shown in fig. 1.
Description of reference numerals:
1-an air inlet; 2-a swirling device; 3-a first divergent section; 4-a transition section; 5-a second divergent section; 6-a main body section; 7-an outlet section; 8, an air inlet pipe; 9-guide vanes; 10-Small Cylinder
Detailed Description
The following description of the embodiments of the present invention is given by way of specific examples, and the arrangement and advantages thereof will become more apparent to those skilled in the art. The following examples are some, not all examples of the present invention, and based on the present examples, modifications of other structures, changes of proportional relationship, and adjustments of size are all included in the protection scope of the present invention under the similar effects and achieved objects of the present invention.
Referring to fig. 1 and 3, fig. 1 is a schematic structural diagram of an embodiment of a urea pyrolysis furnace provided by the present invention; fig. 3 is a schematic view showing a detailed structure of the pyrolysis furnace shown in fig. 1.
In a specific embodiment, the utility model provides a urea pyrolysis furnace includes air inlet 1, whirl device 2, first divergent section 3, changeover portion 4, second divergent section 5, main part section 6, export section 7, and intake pipe 8, guide vane 9, small cylinder 10 have constituteed whirl device 2.
Specifically, the diameter of the air inlet 1 is 406 mm; the diameter of the upper bottom surface of the first divergent section 3 is 406mm, the height is 500mm, and the diameter of the lower bottom surface is 1276 mm; the diameter of the transition section 4 is 1276mm, and the height is 1100 mm; the diameter of the upper bottom surface of the second divergent section 5 is 1276mm, the diameter of the lower bottom surface is 2046mm, and the height is 2183 mm; the diameter of the main body section 6 is 2046mm, and the height is 5800 mm; the diameter of the upper bottom surface of the inverted circular truncated cone of the outlet section 7 is 2046mm, the diameter of the lower bottom surface of the inverted circular truncated cone of the outlet section 7 is 900mm, the height of the inverted circular truncated cone is 1101mm, and the height of a cylinder of the outlet section is 400 mm. The diameter of the air inlet pipe 8 in the cyclone device 2 is 406mm, and the height is 300 mm; the length of the guide vane 9 is 300mm, the height is 1300mm, and the number of the vanes is 6; the small cylinder 10 has a diameter of 100mm and a height of 1300 mm.
Specifically, this pyrolyzing furnace is used for 300MW generating set SCR denitration urea pyrolyzing furnace, 4 spray guns of equipartition around the urea pyrolyzing furnace, and every spray gun stretches into urea pyrolyzing furnace 525mm, spray gun pipe diameter 33.4 mm. The liquid injection amount of a single spray gun is 134kg/h0.03722kg/s, and the used atomization air amount is 25Nm3The maximum particle diameter Dmax of the atomized droplets was 100. mu.m, the minimum particle diameter Dmin was 10 μm, the average particle diameter D32 was 45 μm, and the average velocity of the droplets was 20 m/s. Further, the atomization angle was set to 20 degrees.
The utility model discloses a working process: high-temperature air at 650 ℃ enters from the air inlet 1, passes through the air inlet pipe, a part of hot air flows out along the tangential direction of the guide vanes in a swirling manner, a part of hot air flows out from the small cylinder, the hot air reduces partial speed through the second divergent section and then swirls at a higher speed at the furnace wall, the hot air flows through the main body section of the pyrolysis furnace in a lower-speed swirling manner at the furnace center, the temperature of liquid drops sprayed by the spray gun of the main body section is 20 ℃, 50% of urea liquid drops are contacted with hot air, and after full contact reaction, pyrolysis gas flows out from the outlet after swirling motion in the furnace body.
In the working process, the hot air at the inlet of the novel pyrolysis furnace enters the furnace body along the tangential direction of the air inlet pipe after passing through the cyclone device, the cyclone effect of the hot air is very good, and the hot air can swirl from the top of the furnace to the bottom of the furnace. The speed of the furnace wall is obviously higher than that of the furnace body, the speed of the furnace wall is between 2 and 3m/s, the speed in the furnace body is between 1 and 2m/s, the urea liquid drops do not stick to the wall after being sprayed, and the urea liquid drops do not crystallize on the furnace wall. The urea liquid drops rotate along with the hot air in the furnace, the heat exchange between the liquid drops and the flue gas is sufficient, and the retention time is obviously prolonged compared with that of the urea liquid drops without a cyclone air inlet device. The pressure drop of a small cylinder with the diameter of 100mm in the cyclone air inlet device is reduced by about 60Pa compared with that of a small cylinder without the small cylinder.
The above-mentioned example only is a concrete implementation case of this scheme, and is right the utility model discloses do not have the restriction, all based on this example, the decoration of other structures made, the change of proportional relation, the adjustment of size, in the class with the utility model discloses under produced efficiency and the mesh that can reach, all belong to the utility model discloses the within range of protection that includes.
Claims (10)
1. A urea pyrolysis furnace adopting a rotational flow device is characterized by comprising a first gradually expanding section, a second gradually expanding section, a main body section and an outlet section which are sequentially connected from top to bottom, and the rotational flow device fixed in the first gradually expanding section, wherein the first gradually expanding section and the second simply expanding section are circular truncated cone-shaped shells, the top surface of the first gradually expanding section is provided with an air inlet, the outlet section is a reversed circular truncated cone-shaped shell, and the main body section is a cylindrical shell; the rotational flow device comprises a cylindrical air inlet pipe and a plurality of guide vanes; the upper end of the air inlet pipe is connected with the air inlet, and the lower end of the air inlet pipe is connected with the guide vane; the guide vanes are evenly distributed in the circumferential direction to form a matrix, each guide vane is tangentially distributed outside a cylindrical surface extending downwards of the air inlet pipe, a long edge of each guide vane is located on the cylindrical surface, the upper end of the long edge is connected to the lower end of the air inlet pipe, and the lower end of the long edge is connected to a ring.
2. The urea pyrolysis furnace adopting the cyclone device as recited in claim 1, wherein the divergent angle of the second diverging section is smaller than that of the first diverging section, and the divergent angle between the first diverging section and the second diverging section is between 20 ° and 90 °.
3. The urea pyrolysis furnace using a cyclone device according to claim 1, wherein a transition section is further connected between the first diverging section and the second diverging section, the transition section is a cylindrical shell, and the height of the transition section is less than 1500 mm.
4. The urea pyrolysis furnace using a cyclone device according to claim 3, wherein the cyclone device is fixed in the first diverging section and the transition section by a structure.
5. The urea pyrolysis furnace adopting the cyclone device as claimed in claim 1, wherein the number of the guide vanes of the cyclone device is 4-12, and the length is 200-500 mm.
6. The urea pyrolysis furnace using a cyclone unit as claimed in claim 1, wherein the cyclone unit further comprises a small cylinder fixed to the axis of the cylindrical surface extending downward from the inlet pipe by a structure.
7. The urea pyrolysis furnace adopting the cyclone device as claimed in claim 6, wherein the diameter of the small cylinder is 100-200 mm.
8. The urea pyrolysis furnace adopting the rotational flow device as claimed in claim 1, wherein the ratio of the diameter to the height of the main body section is 1:5 to 1: 10.
9. The urea pyrolysis furnace adopting the rotational flow device as claimed in claim 1, wherein spray guns with downward nozzles are uniformly distributed on the inner wall of the shell of the main body section from top to bottom, the positions of the spray guns are 1/3-1/5 from top to bottom, and the number of the spray guns is 4-8.
10. The urea pyrolysis furnace adopting the cyclone device as claimed in claim 1, wherein the bottom surface of the outlet section is further connected with a cylindrical pipe, and the lower end of the cylindrical pipe is an outlet.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121296037.5U CN215086985U (en) | 2021-06-10 | 2021-06-10 | Urea pyrolysis furnace adopting cyclone device |
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| CN202121296037.5U CN215086985U (en) | 2021-06-10 | 2021-06-10 | Urea pyrolysis furnace adopting cyclone device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115072739A (en) * | 2022-06-15 | 2022-09-20 | 大唐环境产业集团股份有限公司 | Direct-current coupling type urea pyrolysis device |
| WO2023133715A1 (en) * | 2022-01-12 | 2023-07-20 | 广州工商学院 | Platform system for purchase and use management of furniture in college teachers' apartments |
-
2021
- 2021-06-10 CN CN202121296037.5U patent/CN215086985U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023133715A1 (en) * | 2022-01-12 | 2023-07-20 | 广州工商学院 | Platform system for purchase and use management of furniture in college teachers' apartments |
| CN115072739A (en) * | 2022-06-15 | 2022-09-20 | 大唐环境产业集团股份有限公司 | Direct-current coupling type urea pyrolysis device |
| CN115072739B (en) * | 2022-06-15 | 2024-01-19 | 大唐环境产业集团股份有限公司 | Direct current coupling type urea pyrolysis device |
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| GR01 | Patent grant | ||
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| TR01 | Transfer of patent right |
Effective date of registration: 20220519 Address after: 301700 No. 502, gate 1, building 16, Baihe Huayuan, Gaohe Road International City, Hexiwu Town, Wuqing District, Tianjin Patentee after: Peng Daijun Address before: Room 503, unit 1, floor 5, building 7, yard a 12, Jingsheng North 1st Street, Beijing Economic and Technological Development Zone (Tongzhou), Tongzhou District, Beijing 101102 Patentee before: Beijing future Mingneng Technology Co.,Ltd. |
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| TR01 | Transfer of patent right | ||
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Effective date of registration: 20220916 Address after: Unit 503, Unit 1, 5th Floor, Building 7, Yard 12, Jingsheng North 1st Street, Beijing Economic and Technological Development Zone (Tongzhou), Tongzhou District, Beijing 101100 Patentee after: Beijing future Mingneng Technology Co.,Ltd. Address before: 301700 No. 502, gate 1, building 16, Baihe Huayuan, Gaohe Road International City, Hexiwu Town, Wuqing District, Tianjin Patentee before: Peng Daijun |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20211210 |
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| CF01 | Termination of patent right due to non-payment of annual fee |