CN203866045U - Device for preparing ammonia through urea pyrolysis - Google Patents
Device for preparing ammonia through urea pyrolysis Download PDFInfo
- Publication number
- CN203866045U CN203866045U CN201420246672.6U CN201420246672U CN203866045U CN 203866045 U CN203866045 U CN 203866045U CN 201420246672 U CN201420246672 U CN 201420246672U CN 203866045 U CN203866045 U CN 203866045U
- Authority
- CN
- China
- Prior art keywords
- urea pyrolysis
- preparing device
- reaction chamber
- ammonia
- urea
- 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.)
- Expired - Lifetime
Links
- 238000000197 pyrolysis Methods 0.000 title claims abstract description 43
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 42
- 239000004202 carbamide Substances 0.000 title claims abstract description 42
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title abstract description 26
- 229910021529 ammonia Inorganic materials 0.000 title abstract description 13
- 238000006243 chemical reaction Methods 0.000 claims abstract description 26
- 239000007921 spray Substances 0.000 claims description 20
- 230000008602 contraction Effects 0.000 claims description 11
- 238000009792 diffusion process Methods 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 239000007789 gas Substances 0.000 description 12
- 238000009434 installation Methods 0.000 description 6
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000003546 flue gas Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000002829 reductive effect Effects 0.000 description 4
- 235000011114 ammonium hydroxide Nutrition 0.000 description 3
- 238000000354 decomposition reaction Methods 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
- 238000003916 acid precipitation Methods 0.000 description 2
- 238000010531 catalytic reduction reaction Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- PPBAJDRXASKAGH-UHFFFAOYSA-N azane;urea Chemical compound N.NC(N)=O PPBAJDRXASKAGH-UHFFFAOYSA-N 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 150000002430 hydrocarbons Chemical group 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002156 mixing Methods 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
- 238000002360 preparation method Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Treating Waste Gases (AREA)
Abstract
The utility model relates to a device for preparing ammonia through urea pyrolysis. The device comprises an air intake pipeline, a diffusion section and a reaction chamber, which are sequentially connected and arranged in the vertical direction from top to bottom, wherein the lower end opening of the air intake pipeline is arranged in a manner of extending into the diffusion section. Through the adoption of the arrangement scheme, during the diffusion, hot airflow entering the device flows out of the air intake pipe extending into the diffusion section and then freely diffuses instead of being in direct contact with the inner wall of the diffusion section for the air. Therefore, the device for preparing ammonia through the urea pyrolysis, provided by the utility model, can effectively reduce the length of a pyrolysis reactor, lowers the requirements of a pyrolysis device on height and volume, and reduces the production cost.
Description
Technical field
The utility model relates to a kind of urea pyrolysis ammonia-preparing device, belongs to the technical field of urea pyrolysis ammonia processed.
Background technology
Oxynitride (NOx) is one of main atmospheric polluting material, the photo-chemical smog serious harm human health that itself and hydrocarbons form.In addition, oxynitride still causes a major cause of acid rain, and the frequent generation of acid rain causes great impact to ecotope and national economy.At present, main application choice catalytic reduction technology (SCR) is administered flue gas NOx discharge, utilizes reductive agent selectively to react and react with the NOx in flue gas the nitrogen G&W that generates nontoxic pollution-free, reaches the object of denitration environmental protection.The very important link when preparation of denitrification reducing agent in SCR system flow, the reductive agent that denitrating system is conventional has liquefied ammonia, ammoniacal liquor agent urea, select urea as reductive agent, have safe, wide material sources, be easy to the features such as transport and storage, therefore more and more substitutes as liquefied ammonia and ammoniacal liquor of urea, are widely used in denitrating flue gas field.Its action principle is in site of deployment, and urea soln becomes ammonia by pyrolysis installation pyrolysis, delivers to the ammonia on catalyzer in SCR system and sprays grid (AIG), utilizes ammonia to react with the NOx in flue gas, realizes the object of denitration environmental protection.
Common urea pyrolysis device, is the complete empty container in an inside, and warm air enters from the top of reaction chamber, and flow out bottom, and spray gun is positioned at the top of container, along hot blast direction Jet with downward flow direction urea soln.When warm air enters from reactor top, flow velocity is very fast, in order to ensure that warm air arrives when Burners Positions, downward direction is as far as possible vertical, plane speed as far as possible evenly, air-flow mixes with urea soln fully, conventionally by increasing the height of reaction chamber, increase the distance of gas inlet and lance ejection plane, the residence time that increases air-flow with this realizes, tradition pyrolysis installation entrance is set to Venturi tube structure, stable section that need to be longer, comprise that entrance reduces, throat, outlet flaring, thereby the length requirement to pyrolysis oven is higher, owing to being subject to on-the-spot space constraint, this method is the more difficult realization of the site layout project in Practical Project for large-scale reactor, and the reaction chamber of pyrolysis installation is made up of stainless steel, the pyrolysis installation manufacturing cost of large volume is higher.
Utility model content
Technical problem to be solved in the utility model is that urea pyrolysis device of the prior art is in order to ensure the decomposition completely of urea, need to arrange longer pyrolysis oven, site layout project difficulty, cost is higher, thereby the urea pyrolysis that a kind of volume is little, production cost is low ammonia-preparing device is provided.
For solving the problems of the technologies described above, the utility model is achieved through the following technical solutions:
A kind of urea pyrolysis ammonia-preparing device, comprises vertically connecting successively from top to bottom arranging:
Intake ducting is the cylindrical shell of upper and lower both ends open setting;
Expansion section, is communicated with setting with the lower ending opening of described intake ducting, and the diameter of described expansion section vertically increases from top to bottom gradually;
Reaction chamber, is connected setting with the lower end of described expansion section, is provided with spray gun in the inside of described reaction chamber, is provided with pneumatic outlet in the bottom of described reaction chamber;
The inside that the lower ending opening of described intake ducting gos deep into described expansion section arranges.
The inside of described reaction chamber and be positioned at described spray gun above be provided with flow distributor.
Described flow distributor is the plate that is provided with multiple perforates.
Described perforate is uniformly distributed on described plate.
Described plate is dull and stereotyped.
The thickness of described flat board is 5-100mm.
The length that the part of described expansion section inside of going deep into described intake ducting vertically goes up is 50-600mm.
Described reaction chamber forms by vertically connecting successively from top to bottom the cylinder and the contraction section that arrange, the diameter of wherein said contraction section vertically reduces from top to bottom gradually, described pneumatic outlet is arranged on the bottom of described contraction section, and described spray gun is arranged on the inside of described cylinder.
Technique scheme of the present utility model has the following advantages compared to existing technology:
(1) urea pyrolysis ammonia-preparing device described in the utility model, comprises and vertically connects successively from top to bottom the intake ducting, expansion section and the reaction chamber that arrange, the inside that the lower ending opening of wherein said intake ducting gos deep into described expansion section arranges.Pass through this setup, make the hot air flow that enters described urea pyrolysis ammonia-preparing device in the process of diffusion, can directly not touch the inwall of described expansion section, but by the intake ducting that gos deep into expansion section inside out after again free diffusing open, thereby obtain faster and better the hot gas flow evenly flowing downward, be conducive to hot gas flow abundant with mixing of urea soln, and temperature in reaction chamber is even, effectively prevent from when warm air from directly entering taper expansion section by entrance causing temperature field inhomogeneous owing to forcing to diffuse to form vortex, urea pyrolysis device is compared to prior art in order to ensure the decomposition completely of urea, need to arrange longer pyrolysis oven, site layout project difficulty, cost is higher, urea pyrolysis ammonia-preparing device described in the utility model, can effectively shorten the length of pyrolysis reactor, reduce the requirement of pyrolysis installation to height and volume, reduce production cost.
(2) urea pyrolysis ammonia-preparing device described in the utility model, also comprise the flow distributor that is arranged at the inside of described reaction chamber and is positioned at described spray gun top, make its direction of hot gas flow and the speed that diffuse into reactor carry out adjustment distribution again, thereby while arriving Burners Positions by the air-flow of described flow distributor, flow direction more vertically downward, the speed of plane is more even, reduce the impact of eddy current, hot gas flow in pyrolysis reactor has reached the flow field requirement that urea soln decomposes faster, ensure the even pyrolysis of urea soln, effectively prevent that urea soln is because flow field is inhomogeneous etc. former thereby low temperature crystallization and high temperature sintering problem occur.
Brief description of the drawings
For content of the present utility model is more likely to be clearly understood, below in conjunction with accompanying drawing, the utility model is described in further detail, wherein,
Fig. 1 is the structural representation of urea pyrolysis ammonia-preparing device described in the utility model.
In figure, Reference numeral is expressed as: 1-gas inlet, 2-intake ducting, 3-expansion section, 4-flow distributor, 5-spray gun, 6-nozzle, 7-reaction chamber, 8-contraction section, 9-pneumatic outlet.
Embodiment
The structure of urea pyrolysis ammonia-preparing device described in the utility model as shown in Figure 1, comprises and vertically connects successively from top to bottom the intake ducting 2, expansion section 3 and the reaction chamber 7 that arrange.
Wherein, described intake ducting 2 is the cylindrical shell that upper and lower both ends open arranges, and the upper end open of described intake ducting 2 is gas inlet 1; Described expansion section 3 is communicated with the lower ending opening of described intake ducting 2 and arranges and inside that the lower ending opening of described intake ducting 2 gos deep into described expansion section 3 arranges, and the diameter of described expansion section 3 vertically increases from top to bottom gradually; Described reaction chamber 7 is connected setting with the lower end of described expansion section 3, as preferred embodiment, reaction chamber 7 described in the present embodiment forms by vertically connecting successively from top to bottom the cylinder and the contraction section 8 that arrange, the diameter of wherein said contraction section 8 vertically reduces from top to bottom gradually, be provided with pneumatic outlet 9 in the bottom of described contraction section 8, be provided with spray gun 5 in the inside of described cylinder, one end of described spray gun is provided with nozzle 6, for along hot blast to Jet with downward flow direction urea soln.
The length that the part of described expansion section 3 inside of going deep into intake ducting 2 described in the present embodiment vertically goes up is 100mm, as selectable embodiment, it can be 50-600mm that described intake ducting 2 gos deep into the length that the part of described expansion section inside vertically goes up.
The present embodiment is inner and be positioned at described spray gun 5 tops and be provided with flow distributor 4 at described reaction chamber 7, described flow distributor 4 is for being provided with the plate of multiple perforates, described perforate is uniformly distributed on described plate, as the embodiment that can select, described flow distributor is that flat board and diameter equate with described reaction chamber internal diameter, and its thickness is 5-100mm.
The technical process of above-mentioned urea pyrolysis ammonia-preparing device is specific as follows:
The warm air of 350-600 DEG C is delivered to gas inlet 1 by air line, warm air is through intake ducting 2, free diffusing passes through described flow distributor 4 after expansion section 3 again, thereby make hot air flow carry out redistributing and water conservancy diversion, and in the time arriving spray gun 5 position, flow direction more vertically downward, the speed of plane is more even, reduce vortes interference, the atomize urea solution uniform contact that further makes the uniform warm air of temperature field and flow velocity and spray gun 5 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
The pneumatic outlet 9 of ammonia after decomposition by contraction section 8 bottoms and transport pipe enter denitration reaction chamber and carry out selective catalytic reduction reaction.
Adopt described urea pyrolysis ammonia-preparing device of the present utility model, in order to reach the production level that ammonia ability processed is 200kg/h, the diameter that reaction chamber 7 is set is 2100mm, single unit system height setting from gas inlet 1 to pneumatic outlet 9 is not more than 12000mm, gas inlet 1 is not more than 3000mm to the distance of spray gun 5 level attitudes, as the embodiment that can select, it is 8000mm along the height of air flow line that the present embodiment arranges described cylinder, described contraction section is 1500mm along the height of air flow line, with this understanding, the Peak Flow Rate standard deviation that the axial flow velocity of spray gun horizontal plane distributes is 10%, maximum vertical direction drift angle 15 is spent.
But, if utilize existing urea ammonia pyrolysis installation processed and will reach the production level that ammonia ability processed is 200kg/h, the diameter that reactor is set is equally 2100mm, the single unit system height from gas inlet to pneumatic outlet is increased to 13500mm, gas inlet is increased to 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 greater than 5%, and maximum vertical direction drift angle 20 is spent.Hence one can see that, utilizes urea pyrolysis ammonia-preparing device of the present utility model to make the whole height of equipment shorten 18.5%, and the absolute value of Peak Flow Rate standard deviation has reduced 5%, and there has been the improvement of 5 degree maximum vertical direction drift angle.
Obviously, above-described embodiment is only for example is clearly described, and the not restriction 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 without also giving exhaustive to all embodiments.And the apparent variation of being extended out thus or variation are still among protection domain of the present utility model.
Claims (8)
1. a urea pyrolysis ammonia-preparing device, comprises vertically connecting successively from top to bottom arranging:
Intake ducting is the cylindrical shell of upper and lower both ends open setting;
Expansion section, is communicated with setting with the lower ending opening of described intake ducting, and the diameter of described expansion section vertically increases from top to bottom gradually;
Reaction chamber, is connected setting with the lower end of described expansion section, is provided with spray gun in the inside of described reaction chamber, is provided with pneumatic outlet in the bottom of described reaction chamber;
It is characterized in that, the inside that the lower ending opening of described intake ducting gos deep into described expansion section arranges.
2. urea pyrolysis ammonia-preparing device according to claim 1, is characterized in that, the inside of described reaction chamber and be positioned at described spray gun above be provided with flow distributor.
3. urea pyrolysis ammonia-preparing device according to claim 2, is characterized in that, described flow distributor is the plate that is provided with multiple perforates.
4. urea pyrolysis ammonia-preparing device according to claim 3, is characterized in that, described perforate is uniformly distributed on described plate.
5. according to the urea pyrolysis ammonia-preparing device described in claim 3 or 4, it is characterized in that, described plate is dull and stereotyped.
6. urea pyrolysis ammonia-preparing device according to claim 5, is characterized in that, the thickness of described flat board is 5-100mm.
7. urea pyrolysis ammonia-preparing device according to claim 1 and 2, is characterized in that, it is 50-600mm that described intake ducting gos deep into the length that the part of described expansion section inside vertically goes up.
8. urea pyrolysis ammonia-preparing device according to claim 1 and 2, it is characterized in that, described reaction chamber forms by vertically connecting successively from top to bottom the cylinder and the contraction section that arrange, the diameter of wherein said contraction section vertically reduces from top to bottom gradually, described pneumatic outlet is arranged on the bottom of described contraction section, and described spray gun is arranged on the inside of described cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420246672.6U CN203866045U (en) | 2014-05-14 | 2014-05-14 | Device for preparing ammonia through urea pyrolysis |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420246672.6U CN203866045U (en) | 2014-05-14 | 2014-05-14 | Device for preparing ammonia through urea pyrolysis |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203866045U true CN203866045U (en) | 2014-10-08 |
Family
ID=51647024
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420246672.6U Expired - Lifetime CN203866045U (en) | 2014-05-14 | 2014-05-14 | Device for preparing ammonia through urea pyrolysis |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203866045U (en) |
-
2014
- 2014-05-14 CN CN201420246672.6U patent/CN203866045U/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20141008 |