CN205061580U - Urea seeding hydrolysis reactor of two air chambers heating - Google Patents
Urea seeding hydrolysis reactor of two air chambers heating Download PDFInfo
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- CN205061580U CN205061580U CN201520598868.6U CN201520598868U CN205061580U CN 205061580 U CN205061580 U CN 205061580U CN 201520598868 U CN201520598868 U CN 201520598868U CN 205061580 U CN205061580 U CN 205061580U
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- reaction chamber
- urea
- hydrolysis reactor
- seeding hydrolysis
- heating
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- 239000004202 carbamide Substances 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 51
- 238000006460 hydrolysis reaction Methods 0.000 title claims abstract description 35
- 230000007062 hydrolysis Effects 0.000 title claims abstract description 34
- 238000010438 heat treatment Methods 0.000 title claims abstract description 30
- 238000010899 nucleation Methods 0.000 title claims abstract description 28
- 239000007788 liquid Substances 0.000 claims abstract description 24
- 238000006243 chemical reaction Methods 0.000 claims description 48
- 239000010865 sewage Substances 0.000 claims description 16
- 239000003054 catalyst Substances 0.000 claims description 10
- 230000008676 import Effects 0.000 claims description 9
- 238000009434 installation Methods 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- 230000000630 rising effect Effects 0.000 abstract description 2
- 238000007599 discharging Methods 0.000 abstract 1
- 150000003672 ureas Chemical class 0.000 abstract 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 33
- 229910021529 ammonia Inorganic materials 0.000 description 16
- 238000005516 engineering process Methods 0.000 description 10
- 239000007789 gas Substances 0.000 description 10
- 239000000047 product Substances 0.000 description 6
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 5
- 239000003546 flue gas Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 238000005265 energy consumption Methods 0.000 description 4
- 238000000197 pyrolysis Methods 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 230000002829 reductive effect Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 235000011114 ammonium hydroxide Nutrition 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 238000003795 desorption Methods 0.000 description 2
- 230000003301 hydrolyzing effect Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 1
- 235000007926 Craterellus fallax Nutrition 0.000 description 1
- 240000007175 Datura inoxia Species 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 235000011089 carbon dioxide Nutrition 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 150000003016 phosphoric acids Chemical class 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 210000000664 rectum Anatomy 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The utility model discloses an urea seeding hydrolysis reactor of two air chambers heating, this urea seeding hydrolysis reactor include reacting chamber and these two air chambers of blowdown room that are separated by the baffle, the plate washer highly be higher than the half the of reactor height, and heating coil is all installed to the bottom of these two air chambers. Through the liquid level of regular rising reacting chamber, contain the foul solution body with the upper strata and emit into the blowdown room, blowdown liquid carries on discharging after the secondary decomposes in the blowdown room again to heating coil is all installed to these two air chambers, realizes effective utilization of the blowdown and the energy.
Description
Technical field
The utility model belongs to technical field of air pollution control, relates to the hydrolysis reactor that a kind of ammonia utilizing urea seeding to be hydrolyzed generation makes coal-fired power plant denitrating flue gas, is specifically related to the urea seeding hydrolysis reactor of a kind of pair of air chamber heating.
Background technology
Denitrating flue gas, refer to the technology removed by objectionable impurities-NOX contained in the flue gas that (comprises coal firing boiler, oil-burning gas-fired boiler and some industrial furnaces) after high-temp combustion, comprise SCR and SNCR two kinds of major technique schools, wherein SCR is the mainstream technology of denitrating flue gas.So-called SCR technology, refer to and SCR reactor is set between the economizer and air preheater of boiler, in reactor, install catalyzer, spray into reductive agent (ammonia-containing gas) in the flue cross section before reactor, reductive agent and NOX react and remove NOX on catalyst surface.
The reductive agent that SCR denitrating flue gas uses is ammonia essentially, need to arrange at the scene a set of can the device of continuous production ammonia.From raw material, ammonia preparation system can be divided into anhydrous liquid ammonia system, ammoniacal liquor system and urea system.Wherein use the system of liquefied ammonia Evaporation preparation ammonia the most conventional, reason is that its investment is the most cheap, and transport, use cost are also minimum, but there is great potential safety hazard in liquefied ammonia system, particularly its transport and storage process, the harm that A leak of liquefied ammonia brings is very large, and security incident is of common occurrence; The investment of ammoniacal liquor system, operation and transportation cost are all very high, more safe than liquefied ammonia, but still have certain potential safety hazard; The investment of urea system and running cost height compared with liquefied ammonia system, but transportation cost is suitable, and urea system there is no potential safety hazard, is safest ammonia technology of preparing.
The process for producing ammonia from urea technology of current commercial applications mainly contains hydrolysis of urea and urea pyrolysis, wherein hydrolysis of urea includes again the catalytic hydrolysis (SafeDeNOx) of common hydrolysis (AOD, U2A, domestic chemical industry hydrolysis) and U.S. Chemithon, the urea pyrolysis then mainly NOxOUTULTRA technology that provides of American Fuel company (Fueltech).
The soonest and the safest, the on-the-spot container almost not storing up ammonia, its energy consumption and working cost are very high, so comparatively early enter Chinese market, achievement is more, but in today of oil price height enterprise, though there is application, the running cost pressure of single user is very large for the speed of response of pyrolysis.Compare with pyrolysis, be hydrolyzed owing to adopting power plant compared with the steam of horn of plenty as thermal source, energy consumption is lower.But the external technology for hydrolyzing such as AOD, U2A, reaction is comparatively slow needs huge reactor and snubber assembly, its investment and energy consumption higher.The speed of response of catalytic hydrolysis is also very fast, and start-stop is rapid, and energy consumption is lower, but this technology is not also very ripe comparatively speaking, there is no application at home.But if develop ripe urea seeding technology for hydrolyzing, the safety and stability ammonia sources required for SCR denitration device of domestic extensive installation can not only be met, a large amount of energy can also be saved, realize harmony that is energy-conservation and environmental protection.
But under the effect not having catalyzer, this speed of response is comparatively slow, is difficult to meet the corresponding requirement of load.If can by adding effective catalyzer, significantly improving hydrolysis reaction speed, then not only can meet load corresponding requirements, and due to the raising of speed, reduce the requirement to hydrolysis device capacity surge capability, significantly can reduce facility investment.But existing urea seeding hydrolysis device does not consider the process of impurity, cleaning difficulty, high to urea purity requirement, this adds increased operation cost.
Utility model content
For shortcomings and deficiencies of the prior art, the purpose of this utility model is to provide the urea seeding hydrolysis reactor of a kind of pair of air chamber heating, comprise the two air chamber of reaction chamber and blowdown room, and these two air chambers are all provided with heating coil, realize effective utilization of blowdown and the energy.
The technical solution of the utility model is as follows:
A urea seeding hydrolysis reactor for pair air chamber heating, comprises the reaction chamber and these two air chambers of blowdown room that are separated by baffle plate, and the height of described baffle plate is higher than the half of height for reactor, and the bottom of these two air chambers is all provided with heating coil.
Preferably, the height of described baffle plate is the 60%-80% of urea seeding hydrolysis reactor height.
Further, described reaction chamber comprises two temperature sensors, thermometer, tensimeter, pressure transmitter, two radar level gauges, a liquidometer on the spot on the spot on the spot; Described blowdown room comprises a temperature sensor, radar level gauge, a liquidometer on the spot.
Further, described blowdown room is provided with blowdown room sewage draining exit, and the installation site of liquidometer on the spot of described blowdown room is close to described blowdown room sewage draining exit.
Further, the liquidometer on the spot of described reaction chamber and blowdown room adopts steam jacket companion heat.
Further, the useful range of the liquidometer on the spot of described reaction chamber and blowdown room meets that urea seeding hydrolysis reactor is the highest, minimum liquid level requirement, and bore is not less than 100mm.
Further, described reaction chamber is provided with urea soln import and reaction chamber sewage draining exit, described urea soln import and reaction chamber sewage draining exit lay respectively at reaction chamber both sides, described reaction chamber sewage outfalls setting is in lower-most point, described urea soln import is arranged on above described heating coil, runs below liquid level.
Further, be provided with catalyst inlet above described reaction chamber, described catalyst inlet be connected with catalyst inlet pipe, described catalyst inlet pipe is embedded to and runs in liquid level.
Further, described urea seeding hydrolysis reactor is provided with product gas outlet, and described product gas outlet place is configured with steam separator.
Further, described reaction chamber is also provided with the thief hole for carrying out sampling and testing to the sample in reaction chamber.
The beneficial effects of the utility model are as follows:
Because urea and catalyzer contain the pollutent produced in impurity, reaction process, so need solid, settling and other pollutents in timing cleaning reactor, it is made to be retained to minimum value, namely reactor needs regularly to carry out bottom blow-down and surface blow-off, in order to realize good surface blow-off and the twice decomposition of blowdown, the application devises two air chamber: reaction chamber and blowdown room.The liquid level of regular rising reaction chamber, enters blowdown room by upper strata containing soiling solution body, carries out twice decomposition, then discharge reactor containing soiling solution body in blowdown room.Which increase urea desorption column, urea desorption column reaches more than 99%, considerably reduces blowdown loss.
Accompanying drawing explanation
Fig. 1 is the structural representation of the urea seeding hydrolysis reactor embodiment of a kind of pair of air chamber heating that the utility model provides.
In figure: 1-blowdown room; 2-baffle plate; 3-reaction chamber; 4-blowdown room heating coil; 5-reaction chamber heating coil; 6-steam separator; The import of N1-urea soln; N2-catalyst inlet; N3-product gas outlet; N4-reaction chamber sewage draining exit; N5-relief valve port; N6-reserved opening (reaction chamber thief hole); N11-blowdown room sewage draining exit; T1, T2, T4-teletransmission Temperature displaying; T3-is Temperature displaying on the spot; L1, L2, L6, L7-liquid level display on the spot; L3, L4, L5-remote liquid level shows; P1, P2-differential manometer mouth; P3-teletransmission pressure shows; P4-shows with regard to ground pressure; M-manhole.
Embodiment
Below in conjunction with accompanying drawing, structure of the present utility model, principle and working process are further described.
Embodiment 1
As shown in Figure 1, the urea seeding hydrolysis reactor that two air chambers that the utility model provides heat contains blowdown room 1; Baffle plate 2; Reaction chamber 3.In this embodiment, the volume of urea seeding hydrolysis reactor is 5.9 cubic metres, high 1400mm, and the height of baffle plate is 980mm, because the liquid level inside reactor will be the half of height for reactor, the height of baffle plate should higher than the half of height for reactor.The bottom of blowdown room 1 and reaction chamber 3 is all provided with U-shaped heating coil, and the liquid level now inside reactor should higher than U-shaped heating coil.
The first step: the de-mineralized water being added 25% (by volume calculating) by urea soln import N1 in Empty reactor enters reaction chamber 3, makes liquid level reach 350mm.
Second step: a certain amount of catalyzer (such as, ratio is reactor volume 7% phosphoric acid salt catalyzer) being dissolved in urea soln is entered reaction chamber 3 by catalyst inlet N2.
3rd step: the urea soln of mass percentage 50% is entered reaction chamber 3 by urea soln import N1, make liquid level reach 700mm (to 50% of reactor 3 volume), now in reactor 3, the starting point concentration of urea is approximately 25%.Because water first dilutes out during heating, solution can be more and more denseer, and the urea concentration that in reactor 3, Initial dilution starts must not more than 28%.
Liquid level is improved (more than 980mm) by reaction for some time (such as a week), the floating matter above liquid level is made to be drained into blowdown room 1 through baffle plate 2, in experience for some time, the impurity bottom reaction chamber 3 and blowdown room 1 is discharged by reaction chamber sewage draining exit N4 and blowdown room sewage draining exit N11, wherein blowdown liquid is discharged by blowdown room sewage draining exit N11, and the liquid bottom reaction chamber 3 is discharged by reaction chamber sewage draining exit N4.
Blowdown room heating coil 4 and reaction chamber heating coil 5 heat the solution of blowdown room 1 and reaction chamber 3 respectively.Teletransmission Temperature displaying T1, T2, T4 and on the spot Temperature displaying T3; Liquid level display L1, L2, L6, L7 on the spot; Remote liquid level display L3, L4, L5; Differential manometer mouth P1, P2, teletransmission pressure shows P3 and characterizes temperature, liquid level and the pressure of reaction chamber and blowdown room with regard to ground pressure display P4 respectively.
Gas product (ammonia, carbonic acid gas, water vapour) is after steam separator 6 carries out gas-liquid separation, and gas is discharged by product gas outlet N3.Steam separator mainly utilizes gas different with the density of liquid, by expanding pipeline latus rectum, reduction speed also changes the direction of speed, make the drop separation of gas product and entrained with, reduce liquid to the corrosion of subsequent pipeline, equipment, improve the quality of gas product, steam separator is processing and fabricating together with reactor.Reserved opening N6 also can be used as thief hole simultaneously, carries out sampling and testing as required, in addition, steam separator 6 is also provided with relief valve port N5 to the sample in reaction chamber 3.
Manhole M is also provided with above reaction chamber 3.
Claims (9)
1. a urea seeding hydrolysis reactor for two air chamber heating, comprises the reaction chamber and these two air chambers of blowdown room that are separated by baffle plate, and the height of described baffle plate is higher than the half of height for reactor, and the bottom of these two air chambers is all provided with heating coil.
2. the urea seeding hydrolysis reactor of two air chamber heating as claimed in claim 1, it is characterized in that, the height of described baffle plate is the 60%-80% of urea seeding hydrolysis reactor height.
3. the urea seeding hydrolysis reactor of two air chamber heating as claimed in claim 1, it is characterized in that, the reaction chamber of described urea seeding hydrolysis reactor comprises two temperature sensors, thermometer, tensimeter, pressure transmitter, two radar level gauges, a liquidometer on the spot on the spot on the spot; Described blowdown room comprises a temperature sensor, radar level gauge, a liquidometer on the spot.
4. the urea seeding hydrolysis reactor of two air chamber heating as claimed in claim 3, it is characterized in that, described blowdown room is provided with blowdown room sewage draining exit, and the installation site of liquidometer on the spot of described blowdown room is close to described blowdown room sewage draining exit.
5. the urea seeding hydrolysis reactor of two air chamber heating as claimed in claim 3, is characterized in that, the liquidometer on the spot of described reaction chamber and blowdown room adopts steam jacket companion heat.
6. the urea seeding hydrolysis reactor of two air chamber heating as claimed in claim 1, it is characterized in that, described reaction chamber is provided with urea soln import and reaction chamber sewage draining exit, described urea soln import and reaction chamber sewage draining exit lay respectively at reaction chamber both sides, described reaction chamber sewage outfalls setting is in the lower-most point of described reaction chamber, described urea soln import is arranged on above described heating coil, runs below liquid level.
7. the urea seeding hydrolysis reactor of two air chamber heating as claimed in claim 1, it is characterized in that, be provided with catalyst inlet above described reaction chamber, described catalyst inlet be connected with catalyst inlet pipe, the inlet pipe of described catalyzer is embedded to and runs in liquid level.
8. the urea seeding hydrolysis reactor of two air chamber heating as claimed in claim 1, it is characterized in that, described urea seeding hydrolysis reactor is provided with product gas outlet, and described product gas outlet place is configured with the steam separator of the drop separation for making gas product and entrained with.
9. the urea seeding hydrolysis reactor of two air chamber heating as claimed in claim 1, is characterized in that, described reaction chamber is also provided with the thief hole for carrying out sampling and testing to the sample in reaction chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520598868.6U CN205061580U (en) | 2015-08-10 | 2015-08-10 | Urea seeding hydrolysis reactor of two air chambers heating |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520598868.6U CN205061580U (en) | 2015-08-10 | 2015-08-10 | Urea seeding hydrolysis reactor of two air chambers heating |
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| CN205061580U true CN205061580U (en) | 2016-03-02 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105129818A (en) * | 2015-08-10 | 2015-12-09 | 大唐环境产业集团股份有限公司 | Double air chamber heated urea catalytic hydrolysis reactor and method |
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2015
- 2015-08-10 CN CN201520598868.6U patent/CN205061580U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105129818A (en) * | 2015-08-10 | 2015-12-09 | 大唐环境产业集团股份有限公司 | Double air chamber heated urea catalytic hydrolysis reactor and method |
| CN105129818B (en) * | 2015-08-10 | 2017-05-31 | 大唐环境产业集团股份有限公司 | The urea seeding hydrolysis reactor and method of a kind of pair of air chamber heating |
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