CN201907975U - Pyrolysis device for utilizing urea for ammonia preparation - Google Patents
Pyrolysis device for utilizing urea for ammonia preparation Download PDFInfo
- Publication number
- CN201907975U CN201907975U CN2010206337016U CN201020633701U CN201907975U CN 201907975 U CN201907975 U CN 201907975U CN 2010206337016 U CN2010206337016 U CN 2010206337016U CN 201020633701 U CN201020633701 U CN 201020633701U CN 201907975 U CN201907975 U CN 201907975U
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- CN
- China
- Prior art keywords
- reaction chamber
- pyrolysis installation
- urea
- system ammonia
- urea system
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 64
- 238000000197 pyrolysis Methods 0.000 title claims abstract description 52
- 239000004202 carbamide Substances 0.000 title claims abstract description 38
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 37
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 32
- 238000002360 preparation method Methods 0.000 title abstract 2
- 238000006243 chemical reaction Methods 0.000 claims abstract description 41
- 239000007921 spray Substances 0.000 claims abstract description 20
- 238000009434 installation Methods 0.000 claims description 38
- 239000007789 gas Substances 0.000 claims description 33
- 238000009792 diffusion process Methods 0.000 claims description 8
- 230000002829 reductive effect Effects 0.000 claims description 8
- 238000009826 distribution Methods 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 235000012538 ammonium bicarbonate Nutrition 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 239000003546 flue gas Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000001321 HNCO Methods 0.000 description 2
- OWIKHYCFFJSOEH-UHFFFAOYSA-N Isocyanic acid Chemical compound N=C=O OWIKHYCFFJSOEH-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 238000009527 percussion Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 150000003672 ureas Chemical class 0.000 description 1
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Abstract
A pyrolysis device for utilizing urea for ammonia preparation comprises a gas inlet, a reaction chamber, a gas outlet and a sieve plate gas flow distributing device. The reaction chamber is internally provided with a spray gun, the gas inlet is arranged on the upper portion of the reaction chamber, the gas outlet is arranged on the lower portion of the reaction chamber, and the sieve plate gas flow distributing device is disposed in the reaction chamber and positioned on the upper portion of the spray gun. The pyrolysis device solves the problems that an urea pyrolysis device is poor in gas flow distribution and overly large in volume in the prior art, and is uniform in gas flow distribution, small in volume and low in production cost.
Description
Technical field
The utility model relates to a kind of pyrolysis installation that is used for urea system ammonia.The pyrolysis installation that is used for urea system ammonia that specifically a kind of distribution of air flow is even, volume is little, production cost is low.
Background technology
Oxynitride (NOx) is one of main atmospheric polluting material, and at present main application choice catalytic reduction technology (SCR) is administered the flue gas NOx discharging, promptly utilize reductive agent selectively with flue gas in the NOx reaction and generate the nitrogen (N of nontoxic pollution-free
2) and water (H
2O), reach the purpose of denitration environmental protection.The reductive agent that denitrating system is commonly used has liquefied ammonia, ammoniacal liquor and urea, select urea as reductive agent, have safe, wide material sources, be easy to characteristics such as transportation and storage, obtained using widely in the environmental protection field, its action principle is in site of deployment, and urea soln becomes ammonia by the pyrolysis installation pyrolysis, delivers to the traditional ammonia that has on the catalyzer in the SCR system and sprays grid (AIG), utilize the NOx reaction in ammonia and the flue gas, realize the purpose of denitration environmental protection.
Common urea pyrolysis installation, it is the complete empty container in an inside, flow velocity was very fast when warm air entered from reactor top, when guaranteeing that warm air arrives the spray gun position, downward direction is vertical as far as possible, plane speed as far as possible evenly, air-flow mixes with urea soln fully, usually by increasing the height of reaction chamber, promptly increase gas inlet and lance ejection planar distance, realize with this residence time that increases air-flow, tradition pyrolysis device portal is set to Venturi tube structure, need long stable section, comprise that inlet reduces, throat, the outlet flaring, length requirement is higher, owing to be subjected to on-the-spot space constraint, this method realizes for the design arrangement of large-scale reactor in actual engineering is difficult, and the reaction chamber of pyrolysis installation made by stainless steel, and the pyrolysis installation manufacturing cost of large volume is higher.In addition, disclose among the patent documentation CN101574616A a kind of bicarbonate of ammonia system ammonia pyrolysis oven, described pyrolysis body of heater lower section cloth four warm air inlet tubes, the deflection of described four warm air inlet tubes has certain spin intensity after arranging and making warm air enter pyrolysis oven, make stove flow field degree of filling good, uniformity of temperature profile in the pyrolysis oven.Yet because used bicarbonate of ammonia is solid particulate, for being decomposed, described solid particulate needs fierce percussion movement, so the warm air in the described pyrolysis oven need be designed to rotational flow, and hot air inlet is located at the pyrolysis oven bottom, the swirling eddy of bottom guarantees that solid particulate does not land, and the used urea of urea system ammonia is solution, and what need is the warm air that has steady flow speed from top to bottom, and therefore the pyrolysis installation of above-mentioned bicarbonate of ammonia is not suitable for the pyrolysis of urea.
The utility model content
For this reason, technical problem to be solved in the utility model is the problem that urea pyrolysis installation distribution of air flow of the prior art is not good, volume is excessive, thereby the urea that a kind of distribution of air flow is even, volume is little, production cost is low pyrolysis installation is provided.
For solving the problems of the technologies described above, the pyrolysis installation that is used for urea system ammonia of the present utility model, comprise that gas inlet, inside are provided with the reaction chamber and the pneumatic outlet of spray gun, described gas inlet is arranged at described reaction chamber top, described pneumatic outlet is arranged at described reaction chamber bottom, also comprises the sieve plate type flow distributor that is arranged at described reaction chamber inside and described spray gun top.
Described sieve plate type flow distributor is the plate that is provided with a plurality of perforates.
Described perforate is uniformly distributed on the described plate.
Described plate is dull and stereotyped.
Described slab-thickness is 5-100mm.
The diameter of described flat board is consistent with the internal diameter of described reaction chamber.
Also comprise the gaseous diffusion section that is arranged between described gas inlet and the described reaction chamber, described gaseous diffusion section is increased to described reaction chamber upper direction sectional area gradually by described gas inlet.
Also comprise the collection and confinement of gases section that is arranged between described pneumatic outlet and the described reaction chamber, described collection and confinement of gases section is reduced to described pneumatic outlet direction sectional area gradually by described reaction chamber bottom.
Technique scheme of the present utility model has the following advantages compared to existing technology:
(1) is provided with sieve plate type flow distributor in reaction chamber inside and on spray gun top, make and enter the hot gas flow of pyrolysis installation in diffusion process, obtained the hot gas flow flow field that evenly flows downward quickly, improved the positioned opposite position of spray gun, make pyrolysis installation that shorter length requirement be arranged, effectively reduce the height of pyrolysis installation;
(2) described sieve plate type flow distributor is the plate that is provided with a plurality of perforates, after hot gas flow runs into sieve plate type flow distributor, its direction and speed have been carried out adjustment again and have been distributed, when therefore passing through the air-flow arrival spray gun position of sieve plate type flow distributor, flow direction more vertically downward, planar speed is more even, has reduced the influence of eddy current, and the hot gas flow in the pyrolysis installation has reached the flow field requirement that urea soln decomposes faster; Guaranteed the even pyrolysis of urea soln, effectively prevented urea soln because the flow field is inhomogeneous etc. former thereby low temperature crystallization and high temperature sintering problem take place.
(3) described perforate is uniformly distributed on the described flat board, makes that the flow distributor resistance is little, and distribution of air flow is even; Can further determine bore size and quantity according to the different diameter and the different hot air flowrate of concrete pyrolysis installation, to reach better evenly effect.
(4) described slab-thickness is 5-100mm, considers the size of reaction chamber diameter and the strength reduction of metal at high temperature, and slab-thickness is arranged within this scope, has guaranteed dull and stereotyped intensity in reaction chamber.
Description of drawings
For the easier quilt of content of the present utility model is clearly understood, according to specific embodiment of the utility model also in conjunction with the accompanying drawings, the utility model is described in further detail, wherein below
Fig. 1 is the pyrolysis installation synoptic diagram that is used for urea system ammonia described in the utility model;
Fig. 2 is a sieve plate type flow distributor sectional view described in the utility model.
Reference numeral is expressed as among the figure: 1-gas inlet, 2-reaction chamber, 3-pneumatic outlet, 4-spray gun, 5-flow distributor, 6-flat board, 7-perforate, 8-gaseous diffusion section, 9-collection and confinement of gases section.
Embodiment
The synoptic diagram of the urea system of Figure 1 shows that ammonia pyrolysis installation, comprise gas inlet 1, inside is provided with the reaction chamber 2 and the pneumatic outlet 3 of spray gun 4, described gas inlet 1 is arranged at described reaction chamber 2 tops, described pneumatic outlet 3 is arranged at described reaction chamber 2 bottoms, also comprise the sieve plate type flow distributor 5 that is arranged at described reaction chamber 2 inner described spray guns 4 tops, described sieve plate type flow distributor 5 is for being provided with the flat board 6 of a plurality of perforates 7, described perforate 7 is uniformly distributed on described dull and stereotyped 6, described dull and stereotyped 6 thickness are 5-10mm, described dull and stereotyped 6 diameter is consistent with the internal diameter of described reaction chamber, described urea system ammonia pyrolysis installation comprises that also being arranged at described gas goes into gaseous diffusion section 8 between 1 mouthful and the described reaction chamber 2, be arranged at the collection and confinement of gases section 9 between described pneumatic outlet 3 and the described reaction chamber 2, described gaseous diffusion section 8 is increased to described reaction chamber 2 upper direction sectional areas gradually by described gas inlet 1, and described collection and confinement of gases section 9 is reduced to described pneumatic outlet 3 direction sectional areas gradually by described reaction chamber 2 bottoms.
Above-mentioned urea system ammonia pyrolytic technological process is:
350-600 ℃ warm air, be sent to pyrolysis installation gas inlet 1 by air line, warm air through pyrolysis installation expansion section 8 after again by described sieve plate type flow distributor 5, warm air through described sieve plate type flow distributor 5 pairs of hot gas flows redistribute with water conservancy diversion after, vortes interference reduces, and gas velocity is even.The urea soln uniform contact that uniform warm air and spray gun 4 spray, thermal degradation becomes ammonia.Its chemical reaction is as follows:
CO(NH
2)
2→NH
3+HNCO
HNCO+H
2O→NH
3+CO
2
Ammonia after the decomposition is delivered to pneumatic outlet 3 by collection and confinement of gases section 9.Flow distributor 5 and pyrolysis installation select for use heat-resistance stainless steel to make.
The medium-sized reactor that is 200kg/h with a system ammonia ability is an example, adopt above-mentioned urea system ammonia pyrolysis installation of the present utility model, wherein the diameter of pyrolysis installation is 1900mm, single unit system height setting from the gas inlet to the pneumatic outlet is not more than 12500mm, the gas inlet is not more than 4800mm to the distance of spray gun level attitude, with this understanding, the Peak Flow Rate standard deviation that the axial flow velocity of spray gun horizontal plane distributes is 15%, maximum vertical direction drift angle 20 degree.And utilize existing urea system ammonia pyrolysis installation to test equally, this urea system ammonia pyrolysis installation is compared difference and only is that pyrolysis installation inside is not provided with sieve plate type flow distributor with urea system ammonia pyrolysis installation of the present utility model, the diameter of described existing pyrolysis installation is 1900mm, single unit system height from the gas inlet to the pneumatic outlet is increased to 14500mm, the gas inlet is increased to 6800mm to the distance of spray gun level attitude, with this understanding, the Peak Flow Rate standard deviation that the axial flow velocity of spray gun horizontal plane distributes is 25%, maximum vertical direction drift angle 25 degree.As from the foregoing, utilize urea system ammonia pyrolysis installation of the present utility model to make the whole height of equipment shorten 13.8%, the absolute value of Peak Flow Rate standard deviation has reduced 10%, and there has been the improvement of 5 degree maximum vertical direction drift angle.
Obviously, the foregoing description only is for example clearly is described, and is not the qualification to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here need not also can't give exhaustive to all embodiments.And conspicuous variation of being extended out thus or change still are among the protection domain of the utility model creation.
Claims (8)
1. pyrolysis installation that is used for urea system ammonia, comprise that gas inlet (1), inside are provided with the reaction chamber (2) and the pneumatic outlet (3) of spray gun (4), described gas inlet (1) is arranged at described reaction chamber (2) top, described pneumatic outlet (3) is arranged at described reaction chamber (2) bottom, it is characterized in that: also comprise the sieve plate type flow distributor (5) that is arranged at described reaction chamber (2) inside and described spray gun (4) top.
2. the pyrolysis installation that is used for urea system ammonia according to claim 1 is characterized in that: described sieve plate type flow distributor (5) is for being provided with the plate of a plurality of perforates (7).
3. the pyrolysis installation that is used for urea system ammonia according to claim 2 is characterized in that: described perforate (7) is uniformly distributed on the described plate.
4. according to claim 2 or the 3 described pyrolysis installations that are used for urea system ammonia, it is characterized in that: described plate is dull and stereotyped (6).
5. the pyrolysis installation that is used for urea system ammonia according to claim 4 is characterized in that: described flat board (6) thickness is 5-100mm.
6. the pyrolysis installation that is used for urea system ammonia according to claim 4 is characterized in that: the diameter of described flat board (6) is consistent with the internal diameter of described reaction chamber (2).
7. according to any described pyrolysis installation that is used for urea system ammonia among the claim 1-3, it is characterized in that: also comprise the gaseous diffusion section (8) that is arranged between described gas inlet (1) and the described reaction chamber (2), described gaseous diffusion section (8) is increased to described reaction chamber (2) upper direction sectional area gradually by described gas inlet (1).
8. according to any described pyrolysis installation that is used for urea system ammonia among the claim 1-3, it is characterized in that: also comprise the collection and confinement of gases section (9) that is arranged between described pneumatic outlet (3) and the described reaction chamber (2), described collection and confinement of gases section (9) is reduced to described pneumatic outlet direction (3) sectional area gradually by described reaction chamber (2) bottom.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206337016U CN201907975U (en) | 2010-11-25 | 2010-11-25 | Pyrolysis device for utilizing urea for ammonia preparation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206337016U CN201907975U (en) | 2010-11-25 | 2010-11-25 | Pyrolysis device for utilizing urea for ammonia preparation |
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| Publication Number | Publication Date |
|---|---|
| CN201907975U true CN201907975U (en) | 2011-07-27 |
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ID=44300181
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206337016U Expired - Fee Related CN201907975U (en) | 2010-11-25 | 2010-11-25 | Pyrolysis device for utilizing urea for ammonia preparation |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103159231A (en) * | 2013-02-06 | 2013-06-19 | 中国大唐集团环境技术有限公司 | Device for guiding air flow on urea pyrolysis reactor |
| CN103172085A (en) * | 2013-02-06 | 2013-06-26 | 中国大唐集团环境技术有限公司 | Air flow guiding method for urea pyrolytic reaction |
| CN103611486A (en) * | 2012-09-24 | 2014-03-05 | 中国大唐集团环境技术有限公司 | Urea pyrolysis reactor applied to SCR denitration |
| CN103964469A (en) * | 2013-02-06 | 2014-08-06 | 中国大唐集团环境技术有限公司 | Device for preparing ammonia through pyrolysis of urea |
| CN104003416A (en) * | 2013-04-19 | 2014-08-27 | 中国大唐集团环境技术有限公司 | Volute-air-inlet spiral-flow type device and method for preparing ammonia by urea pyrolysis |
| CN104949903A (en) * | 2015-07-01 | 2015-09-30 | 中国矿业大学 | A test device and method for simulating the uniform diffusion of CO2 in soil |
| CN106082271A (en) * | 2016-06-01 | 2016-11-09 | 福建龙净环保股份有限公司 | It is applicable to carbamide back-mixing pyrolysis installation and the method for pyrolysis of SCR denitration system |
| 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 |
-
2010
- 2010-11-25 CN CN2010206337016U patent/CN201907975U/en not_active Expired - Fee Related
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103611486A (en) * | 2012-09-24 | 2014-03-05 | 中国大唐集团环境技术有限公司 | Urea pyrolysis reactor applied to SCR denitration |
| CN103611486B (en) * | 2012-09-24 | 2015-09-09 | 中国大唐集团环境技术有限公司 | A kind of urea pyrolysis reactor being applied to SCR denitration |
| CN103159231B (en) * | 2013-02-06 | 2015-03-04 | 中国大唐集团环境技术有限公司 | Urea pyrolysis reactor |
| CN103964469A (en) * | 2013-02-06 | 2014-08-06 | 中国大唐集团环境技术有限公司 | Device for preparing ammonia through pyrolysis of urea |
| CN103172085B (en) * | 2013-02-06 | 2014-12-24 | 中国大唐集团环境技术有限公司 | Air flow guiding method for urea pyrolytic reaction |
| CN103159231A (en) * | 2013-02-06 | 2013-06-19 | 中国大唐集团环境技术有限公司 | Device for guiding air flow on urea pyrolysis reactor |
| CN103172085A (en) * | 2013-02-06 | 2013-06-26 | 中国大唐集团环境技术有限公司 | Air flow guiding method for urea pyrolytic reaction |
| CN104003416A (en) * | 2013-04-19 | 2014-08-27 | 中国大唐集团环境技术有限公司 | Volute-air-inlet spiral-flow type device and method for preparing ammonia by urea pyrolysis |
| CN104003416B (en) * | 2013-04-19 | 2015-09-30 | 中国大唐集团环境技术有限公司 | A kind of volute air-inlet whirlwind-type urea pyrolysis ammonia-preparing device and method |
| CN104949903A (en) * | 2015-07-01 | 2015-09-30 | 中国矿业大学 | A test device and method for simulating the uniform diffusion of CO2 in soil |
| CN106082271A (en) * | 2016-06-01 | 2016-11-09 | 福建龙净环保股份有限公司 | It is applicable to carbamide back-mixing pyrolysis installation and the method for pyrolysis of SCR denitration system |
| CN106082271B (en) * | 2016-06-01 | 2018-07-03 | 福建龙净环保股份有限公司 | Suitable for the urea back-mixing pyrolysis installation and method for pyrolysis of SCR denitration system |
| 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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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: FUEL TECH. INC. Free format text: FORMER OWNER: BEIJING LOWCARBON ENVIRONMENTAL TECH CO., LTD. Effective date: 20130123 Owner name: BEIJING FUEL TECH ENVIRONMENTAL TECHNOLOGIES CO., Effective date: 20130123 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20130123 Address after: Illinois, USA Patentee after: FUEL TECH, Inc. Patentee after: Beijing futaike Environmental Protection Technology Co., Ltd. Address before: 100012 Beijing city Chaoyang District North Hui building 312, room 1405, block B2 days Creation fate Patentee before: Beijing Lowcarbon Environment Protection Technology Co., Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110727 Termination date: 20161125 |
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| CF01 | Termination of patent right due to non-payment of annual fee |