CN203173834U - Reverse-flow urea-pyrolysis ammonia preparing device - Google Patents
Reverse-flow urea-pyrolysis ammonia preparing device Download PDFInfo
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- CN203173834U CN203173834U CN 201320202551 CN201320202551U CN203173834U CN 203173834 U CN203173834 U CN 203173834U CN 201320202551 CN201320202551 CN 201320202551 CN 201320202551 U CN201320202551 U CN 201320202551U CN 203173834 U CN203173834 U CN 203173834U
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Abstract
The utility model provides a reverse-flow urea-pyrolysis ammonia preparing device which comprises an inlet section, a main body section for performing urea-pyrolysis ammonia preparing reaction, a conical B contraction section and an outlet section, wherein the inlet section is arranged on the lower part of the main body section; the outlet section is arranged on the upper part of the pyrolysis ammonia preparing device; the upper part of the main body section is connected with the outlet section through the conical B contraction section; the inlet section comprises a gas feeding section and a venturi tube. By the reverse-flow urea-pyrolysis ammonia preparing device, the possibility of urea crystallization and blocking is reduced, the pyrolysis reaction duration time is prolonged, the heat transmission and mass transferring effects of a pyrolysis device are improved, and the stability of a pyrolysis system is improved; the whole design is simple; the costs caused by running and maintaining of the pyrolysis equipment are reduced, and the regular maintenance period is prolonged.
Description
Technical field
The utility model belongs to the technical field of selective catalytic reduction flue gas denitration, is specifically related to a kind of reverse-flow urea pyrolysis ammonia-preparing device.
Background technology
Selecting property catalytic reduction flue gas denitration is the SCR denitrating flue gas, and SCR is the power-plant flue gas method of denitration of current widespread use.In denitrating system, reductive agent is maximum running stores, and its consuming cost directly has influence on the macroeconomic index of denitrating system, and at present, SCR denitrating flue gas reductive agent comprises liquefied ammonia, ammoniacal liquor and urea.Liquefied ammonia, ammoniacal liquor and urea all can be used as the denitrating flue gas reductive agent, and along with the maturation day by day of denitrification reducing agent preparation, storage and provisioning technique, the selection principle of denitrification reducing agent transfers to gradually based on safety and economy.Liquefied ammonia is hazardous chemical, along with the pay attention to day by day of country to safety problem, put into effect a series of relevant restrictions just gradually, make power plant with liquefied ammonia the time examine, all many-sides such as duration, occupation of land are subjected to increasing restriction, the back of putting into operation is also comparatively loaded down with trivial details by the program of environmental protection inspection and acceptance; Ammoniacal liquor is because the high limitation of also being used of its running cost.As non-hazardous ammonia raw material processed, urea pyrolysis ammonia processed has the denitration performance identical with liquefied ammonia, and urea is green fertilizer, nontoxicity, thereby does not have regulation limitations, and is convenient to transportation, stores and uses.SCR denitration employing urea is that reductive agent has become a kind of trend at home at present.
The decomposition of urea is mainly carried out in pyrolysis reactor, and pyrolysis reactor is the complete empty container in an inside, and warm air enters from entrance, and urea provides the injector that distributes fully to be injected in the warm air through one to react.The urea pyrolysis ammonia-preparing device that present engineering is at home used, design form is top single channel air inlet, then the even distribution that realizes flow field and temperature field by eddy flow plate or the airflow uniform distribution plate of built-in different structure.But ubiquitous problem is: the design of (1) eddy flow plate is difficult to guarantee form enough flow field and temperature field uniformly in pyrolysis installation, especially in the zone near pyrolysis installation, form local low temperature or low regime easily, cause urea soln to be stained with wall, even crystallization; (2) existence of airflow uniform distribution plate has increased the integral pressure loss of pyrolysis installation, and permanent operation is stopped up perforate because of the formation of the accumulation of ash content and crystallization easily, in case perforate is stopped up then can be caused the flow field disorder, and then influences the steady running of whole pyrolysis system.
The pyrolysis installation of a kind of urea ammonia processed is disclosed among the patent CN201020633701.6, comprise that gas inlet, inside are provided with reaction chamber and the pneumatic outlet of spray gun, the gas inlet is arranged at reaction chamber top, pneumatic outlet is arranged at the reaction chamber bottom, comprises that also to be arranged at reaction chamber inner and at the sieve plate type flow distributor on spray gun top.Pyrolysis installation has solved and has had the problem that distribution of air flow is not good in the urea pyrolysis installation, volume is excessive in the prior art, yet air-flow is not through still avoiding the existence of adherent low regime in the pyrolysis oven behind the sieve tray, the heat and mass transfer effect in the pyrolysis installation still has very big room for promotion.
The utility model content
In order to overcome urea crystals and obstruction, the steady running of pyrolysis system is poor, the shortcoming of the heat and mass transfer poor effect of pyrolysis installation, the utility model provide a kind of reverse-flow urea pyrolysis ammonia-preparing device, have reduced urea crystals and phenomenon of blocking, prolonged the pyrolytic reaction residence time, improved the heat and mass transfer effect of pyrolysis installation, improved the stability of pyrolysis system, global design is simple, and reduce operation and safeguard the caused expense of pyrolysis plant, prolong the cycle of scheduled maintenance.
The technical scheme that its technical problem that solves the utility model adopts is: a kind of reverse-flow urea pyrolysis ammonia-preparing device, comprise entrance, carry out the main paragraph of urea pyrolysis ammonia react processed, cone shape B contraction section, the outlet section that ammonia is discharged will be made, it is characterized in that, entrance is arranged on the bottom of main paragraph, outlet section is arranged on the top of pyrolysis ammonia-preparing device, the top of main paragraph is connected with outlet section by the B contraction section, entrance comprises air inlet section and Venturi tube, urea pyrolysis ammonia-preparing device adopts reverse-flow air inlet, prolong the residence time of urea at the pyrolysis installation main paragraph, improved the heat and mass transfer effect of pyrolysis installation.
Venturi tube comprises A contraction section, trunnion, expansion section, and the A contraction section is connected with expansion section by trunnion.
The A contraction section is conical tube, trunnion is cylindrical sleeve, expansion section is the rounding Taper Pipe, the air inlet section is connected with an end of conical tube, the other end of conical tube is by cylindrical sleeve and inverted cone pipe coupling, the other end of rounding Taper Pipe is connected with main paragraph, and Venturi tube makes air-flow form at a high speed hot gas flow uniformly, has reduced urea crystals and phenomenon of blocking.
The air inlet section comprises the transition section of inlet mouth and cylindrical tube, and inlet mouth is connected with Venturi tube by transition section.
At least one place is provided with the uniform eddy flow plate of the Flow Field Distribution that makes urea pyrolysis ammonia-preparing device in air inlet section, A contraction section, trunnion, the expansion section, is conducive to air-flow and forms eddy flow at a high speed.
Preferably, in trunnion, be provided with the uniform eddy flow plate of the Flow Field Distribution that makes urea pyrolysis ammonia-preparing device.
The eddy flow plate is made up of the blade that several are circular layout, and the cross section angulation of blade and pipeline is 30 °-50 °.
Main paragraph is right cylinder, is provided with the twin spray gun of the urea soln that atomizing is provided in main paragraph, and spray gun arranges evenly that along the inner peripheral surface of main paragraph spray gun is provided with the 4-6 root.
The beneficial effects of the utility model are, urea crystals and phenomenon of blocking have been reduced, prolonged the pyrolytic reaction residence time, improved the heat and mass transfer effect of pyrolysis installation, improved the stability of pyrolysis system, global design is simple, and reduces operation and safeguard the caused expense of pyrolysis plant, prolongs the cycle of scheduled maintenance.
Description of drawings
Below in conjunction with accompanying drawing reverse-flow urea pyrolysis ammonia-preparing device described in the utility model is specifically described.
Fig. 1 is structural representation of the present utility model;
Fig. 2 is the plan structure synoptic diagram of the utility model eddy flow plate;
Fig. 3 is the side-looking structural representation of the utility model eddy flow plate.
As shown in the figure, inlet mouth 1, A contraction section 2, trunnion 3, expansion section 4, main paragraph 5, B contraction section 6, outlet section 7, spray gun 8, eddy flow plate 9, blade 10, transition section 11.
Embodiment
As shown in Figure 1, reverse-flow urea pyrolysis ammonia-preparing device comprises B contraction section 6, the outlet section 7 of entrance, main paragraph 5, tapered tube shape.Entrance is arranged on the bottom of main paragraph 5, comprise air inlet section and Venturi tube, the air inlet section comprises inlet mouth 1 and transition section 11, transition section 11 is cylindrical tube, inlet mouth 1 is connected with Venturi tube by transition section 11, warm air is entered in the Venturi tube with plumbness, be convenient to warm air flowing in Venturi tube.Venturi tube comprises A contraction section 2, the trunnion 3 that increases the warm air flow velocity, the expansion section 4 that keeps warm air flow velocity and steady flow condition.Transition section 11 is connected with an end of A contraction section 2, and the other end of A contraction section 2 is connected with trunnion 3, and trunnion 3 is connected with the bottom of main paragraph 5 by expansion section 4, and the top of main paragraph 5 is connected with outlet section 7 by B contraction section 6.
Urea pyrolysis ammonia-preparing device adopts reverse-flow air inlet, and use Venturi tube as entrance, accelerated the flow velocity of warm air and the urea soln of near zone has been produced adsorptive power, can greatly prolong the residence time of urea in pyrolysis installation like this, improve the mass-and heat-transfer effect, form at a high speed hot gas flow uniformly, effectively reduce urea crystals and latch up phenomenon, increase the reaction times, be conducive to the decomposition of urea.Whole pyrolysis installation is simple in structure, reduces operation and safeguards the caused expense of pyrolysis plant, prolongs the cycle of scheduled maintenance.And Venturi tube is arranged in the bottom of pyrolysis installation, is beneficial to maintenance and maintenance.
A contraction section 2 is conical tube, is shunk gradually to trunnion 3 by inlet mouth 1, and angle of throat is 15 °-35 °, has increased the flow velocity of warm air.Trunnion 3 is columned sleeve pipe, and the diameter after the diameter of trunnion 3 and A contraction section 2 shrinks is identical, makes that warm air at a high speed is stable to pass through.Expansion section 4 is the rounding Taper Pipe, is expanded gradually to main paragraph 5 by trunnion 3, and extended corner is 25 °-45 °, has reduced the higher flow velocity of warm air, steady flow condition.
Shown in Fig. 2,3, in air inlet section, A contraction section 2, trunnion 3, expansion section 4, have at least a place to be provided with eddy flow plate 9, preferred, in trunnion 3, be provided with eddy flow plate 9.Warm air has produced the vacuum zone in Venturi tube, make warm air reach higher flow velocity, and pressure reduces, and produces pressure difference, and liquid is on every side produced external adsorptive power.The eddy flow plate that arranges in the Venturi tube makes warm air at a high speed produce eddy flow, and eddy flow evenly distributes, and by bottom inflow, sails against the current, and chemical reaction takes place the urea soln uniform contact with in the spray gun better.Spray gun sprays the urea soln that falls and falls in the bottom, because the vacuum suck of Venturi tube and the cyclonic action of eddy flow plate, the urea soln of absorption periphery is again with warm air generation pyrolysis ammonia react processed at a high speed, effectively reduced crystallization, life-time service has reduced latch up phenomenon.Eddy flow plate 9 is made up of the polylith blade 10 that is circular layout, and the cross section angulation of blade and pipeline is 30 °-50 °.Eddy flow plate 9 directing air flows form eddy flow, make that the Flow Field Distribution of urea pyrolysis ammonia-preparing device is even.Venturi tube has been built uniform gas flowfield and temperature flow field jointly with the eddy flow plate that is arranged in the Venturi tube, has prolonged the residence time of gas in urea pyrolysis ammonia-preparing device, allows reaction more fully thoroughly, and has reduced air resistance.
Warm air is heated to about 600 ℃ by external heat source, is entered in the transition section 11 by inlet mouth 1 by the bottom of pyrolysis ammonia-preparing device, makes that gas is plumbness, enters A contraction section 2 again.A contraction section 2 the warm air that is flowed into by transition section 11 from the coarse to fine, to accelerate gas flow rate, hot gas flow passes through at a high speed in trunnion 3, and pressure reduces, produce pressure difference, make gas form one " vacuum " district in the exit of expansion section 4, air-flow keeps higher flow velocity on the one hand, and high speed airflow is gone into main paragraph 5 through expansion section 4 is laggard; On the other hand, " vacuum " of generation district can produce certain external adsorption to the urea soln of near zone, with air-flow generation pyrolytic reaction, effectively reduces urea crystals and latch up phenomenon.
When the air-flow adverse current is passed through inlet mouth 1, transition section 11, A contraction section 2, trunnion 3, owing in the trunnion 3 the eddy flow plate is installed, through the guiding of eddy flow plate, makes warm air form eddy flow, enter expansion section 4 then, keep eddy flow state flow at a high speed to the top of main paragraph 5.Be connected to two-way outlet on the spray gun 8 in the main paragraph 5: the one tunnel is the urea soln that configures, and one the tunnel is atomizing air, and two-way outlet makes urea soln atomize.On the one hand, urea soln sprays into main paragraph 5 by spray gun 8, and the urea soln of atomizing reacts in main paragraph 5 with the warm air uniform contact of eddy flow state, and the urea pyrolysis generates ammonia.On the other hand, the vacuum zone that expansion section 4 produces produces certain adsorptive power near zone by the urea soln that drips in the main reaction section, makes itself and warm air uniform contact, pyrogenically prepared ammonia.Its reaction equation is as follows:
CO(NH
2)
2→NH
3+HNCO
HNCO+H
2O→NH
3+CO
2
Ammonia after the pyrolysis is delivered to outlet section 7 by B contraction section 6.
Urea pyrolysis ammonia-preparing device adopts reverse-flow air inlet not only to make urea soln fully contact with warm air, heat up rapidly pyrolytic reaction takes place, and by air-flow take to pyrolysis installation top urea crystals can since action of gravity fall after rise, contact again with warm air, promote its decomposition, reduced urea crystals and latch up phenomenon.Urea pyrolysis ammonia-preparing device adopts Venturi tube as entrance, can be so that warm air produces higher flow velocity, the top of air-flow being taken to pyrolysis installation fully contacts with urea soln, and the pressure difference that reduces to produce of pressure produces adsorptive power to the urea soln of near zone, make itself and warm air uniform contact, reduced urea crystals and latch up phenomenon greatly.The eddy flow plate of arranging at the trunnion place makes upstream air form eddy flow, the urea crystals that one side eddy flow at a high speed can avoid adherent low regime to cause, eddy flow makes air-flow increase greatly in the residence time of pyrolysis installation inside on the other hand, reduced the height of pyrolysis installation as much as possible, both save the place greatly, and can reduce the cost of investment and operation again.
Claims (8)
1. reverse-flow urea pyrolysis ammonia-preparing device, comprise entrance, carry out urea pyrolysis ammonia react processed main paragraph (5), cone shape B contraction section (6), will make the outlet section (7) that ammonia is discharged, it is characterized in that, described entrance is arranged on the bottom of main paragraph (5), described outlet section (7) is arranged on the top of pyrolysis ammonia-preparing device, the top of described main paragraph (5) is connected with outlet section (7) by B contraction section (6), and described entrance comprises air inlet section and Venturi tube.
2. a kind of reverse-flow urea pyrolysis ammonia-preparing device according to claim 1, it is characterized in that, described Venturi tube comprises A contraction section (2), trunnion (3), expansion section (4), and described A contraction section (2) is connected with expansion section (4) by trunnion (3).
3. a kind of reverse-flow urea pyrolysis ammonia-preparing device according to claim 2, it is characterized in that, described A contraction section (2) is conical tube, trunnion (3) is cylindrical sleeve, expansion section (4) is the rounding Taper Pipe, described air inlet section is connected with an end of conical tube, and the other end of conical tube is by cylindrical sleeve and inverted cone pipe coupling, and the other end of rounding Taper Pipe is connected with main paragraph (5).
4. a kind of reverse-flow urea pyrolysis ammonia-preparing device according to claim 1 is characterized in that described air inlet section comprises the transition section (11) of inlet mouth (1) and cylindrical tube, and described inlet mouth (1) is connected with Venturi tube by transition section (11).
5. according to each described a kind of reverse-flow urea pyrolysis ammonia-preparing device among the claim 1-4, it is characterized in that at least one place is provided with the uniform eddy flow plate of the Flow Field Distribution that makes urea pyrolysis ammonia-preparing device in described air inlet section, A contraction section (2), trunnion (3), the expansion section (4).
6. a kind of reverse-flow urea pyrolysis ammonia-preparing device according to claim 5 is characterized in that, is provided with the uniform eddy flow plate of the Flow Field Distribution that makes urea pyrolysis ammonia-preparing device (9) in described trunnion (3).
7. a kind of reverse-flow urea pyrolysis ammonia-preparing device according to claim 5 is characterized in that described eddy flow plate is made up of several blades that are circular layout (10), and described blade (10) is 30 °-50 ° with the cross section angulation of pipeline.
8. a kind of reverse-flow urea pyrolysis ammonia-preparing device according to claim 1, it is characterized in that, described main paragraph (5) is right cylinder, in main paragraph (5), be provided with the twin spray gun (8) of the urea soln that atomizing is provided, described spray gun (8) arranges evenly that along the inner peripheral surface of main paragraph described spray gun (8) is provided with the 4-6 root.
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| CN 201320202551 CN203173834U (en) | 2013-04-19 | 2013-04-19 | Reverse-flow urea-pyrolysis ammonia preparing device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103723743A (en) * | 2013-10-10 | 2014-04-16 | 西安交通大学 | Reactor for urea pyrolysis to produce ammonia for flue gas denitration |
| CN103936029A (en) * | 2014-04-18 | 2014-07-23 | 西安交通大学 | Fluidized bed reactor for preparing ammonia by virtue of pyrolysis of urea |
| CN104003417A (en) * | 2013-04-19 | 2014-08-27 | 中国大唐集团环境技术有限公司 | Reverse-flow device and method for preparing ammonia by urea pyrolysis |
| CN104016374A (en) * | 2014-04-29 | 2014-09-03 | 大唐科技产业集团有限公司 | Novel urea pyrolysis furnace for denitrifying flue gas |
-
2013
- 2013-04-19 CN CN 201320202551 patent/CN203173834U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104003417A (en) * | 2013-04-19 | 2014-08-27 | 中国大唐集团环境技术有限公司 | Reverse-flow device and method for preparing ammonia by urea pyrolysis |
| CN104003417B (en) * | 2013-04-19 | 2016-03-30 | 大唐环境产业集团股份有限公司 | A kind of reverse-flow urea pyrolysis ammonia-preparing device and method |
| CN103723743A (en) * | 2013-10-10 | 2014-04-16 | 西安交通大学 | Reactor for urea pyrolysis to produce ammonia for flue gas denitration |
| CN103936029A (en) * | 2014-04-18 | 2014-07-23 | 西安交通大学 | Fluidized bed reactor for preparing ammonia by virtue of pyrolysis of urea |
| CN103936029B (en) * | 2014-04-18 | 2016-08-17 | 西安交通大学 | A kind of fluidized-bed reactor of urea pyrolysis ammonia |
| CN104016374A (en) * | 2014-04-29 | 2014-09-03 | 大唐科技产业集团有限公司 | Novel urea pyrolysis furnace for denitrifying flue gas |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 100097 Beijing Haidian District Zizhuyuan Road No. 120 Patentee after: DATANG ENVIRONMENT INDUSTRY GROUP Co.,Ltd. Patentee after: China Datang Technologies & Engineering Co.,Ltd. Address before: 100097 Beijing Haidian District Zizhuyuan Road No. 120 Patentee before: DATANG TECHNOLOGY INDUSTRY GROUP CO.,LTD. Patentee before: China Datang Technologies & Engineering Co.,Ltd. Address after: 100097 Beijing Haidian District Zizhuyuan Road No. 120 Patentee after: DATANG TECHNOLOGY INDUSTRY GROUP CO.,LTD. Patentee after: China Datang Technologies & Engineering Co.,Ltd. Address before: 100097 Beijing Haidian District Zizhuyuan Road No. 120 Patentee before: DATANG TECHNOLOGY INDUSTRY Co.,Ltd. Patentee before: China Datang Technologies & Engineering Co.,Ltd. Address after: 100097 Beijing Haidian District Zizhuyuan Road No. 120 Patentee after: DATANG TECHNOLOGY INDUSTRY Co.,Ltd. Patentee after: China Datang Technologies & Engineering Co.,Ltd. Address before: 100097 Beijing Haidian District Zizhuyuan Road No. 120 Patentee before: CHINA DATANG GROUP ENVIRONMENT TECHNOLOGY CO.,LTD. Patentee before: China Datang Technologies & Engineering Co.,Ltd. |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20130904 Effective date of abandoning: 20160330 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20130904 Effective date of abandoning: 20160330 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |