CN203922753U - A kind of urea hydrolyser for the production of ammonia - Google Patents
A kind of urea hydrolyser for the production of ammonia Download PDFInfo
- Publication number
- CN203922753U CN203922753U CN201420298897.6U CN201420298897U CN203922753U CN 203922753 U CN203922753 U CN 203922753U CN 201420298897 U CN201420298897 U CN 201420298897U CN 203922753 U CN203922753 U CN 203922753U
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- Prior art keywords
- urea
- hydrolyzer
- air
- urea soln
- distribution
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- 239000004202 carbamide Substances 0.000 title claims abstract description 192
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 191
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 82
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 41
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 28
- 238000009826 distribution Methods 0.000 claims abstract description 118
- 238000010438 heat treatment Methods 0.000 claims abstract description 54
- 230000008676 import Effects 0.000 claims description 13
- 239000007788 liquid Substances 0.000 claims description 13
- 238000004891 communication Methods 0.000 claims description 3
- 238000005260 corrosion Methods 0.000 abstract description 9
- 230000007797 corrosion Effects 0.000 abstract description 9
- 230000002829 reductive effect Effects 0.000 abstract description 7
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 230000003245 working effect Effects 0.000 abstract description 3
- -1 carboxylamine amine Chemical class 0.000 abstract description 2
- 238000006460 hydrolysis reaction Methods 0.000 description 24
- 230000007062 hydrolysis Effects 0.000 description 22
- 239000007789 gas Substances 0.000 description 21
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 15
- 239000001301 oxygen Substances 0.000 description 15
- 229910052760 oxygen Inorganic materials 0.000 description 15
- BVCZEBOGSOYJJT-UHFFFAOYSA-N ammonium carbamate Chemical compound [NH4+].NC([O-])=O BVCZEBOGSOYJJT-UHFFFAOYSA-N 0.000 description 11
- 238000000034 method Methods 0.000 description 11
- 229910001220 stainless steel Inorganic materials 0.000 description 11
- 239000010935 stainless steel Substances 0.000 description 11
- KXDHJXZQYSOELW-UHFFFAOYSA-N carbonic acid monoamide Natural products NC(O)=O KXDHJXZQYSOELW-UHFFFAOYSA-N 0.000 description 10
- 239000012071 phase Substances 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 238000009835 boiling Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000012535 impurity Substances 0.000 description 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- OHJMTUPIZMNBFR-UHFFFAOYSA-N biuret Chemical compound NC(=O)NC(N)=O OHJMTUPIZMNBFR-UHFFFAOYSA-N 0.000 description 3
- 235000011089 carbon dioxide Nutrition 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 239000003546 flue gas Substances 0.000 description 3
- 239000007791 liquid phase Substances 0.000 description 3
- 238000010899 nucleation Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000006388 chemical passivation reaction Methods 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 239000007800 oxidant agent Substances 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000002335 preservative effect Effects 0.000 description 2
- 238000000197 pyrolysis Methods 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- LFVGISIMTYGQHF-UHFFFAOYSA-N ammonium dihydrogen phosphate Chemical compound [NH4+].OP(O)([O-])=O LFVGISIMTYGQHF-UHFFFAOYSA-N 0.000 description 1
- JYYOBHFYCIDXHH-UHFFFAOYSA-N carbonic acid;hydrate Chemical compound O.OC(O)=O JYYOBHFYCIDXHH-UHFFFAOYSA-N 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000010612 desalination reaction Methods 0.000 description 1
- MNNHAPBLZZVQHP-UHFFFAOYSA-N diammonium hydrogen phosphate Chemical compound [NH4+].[NH4+].OP([O-])([O-])=O MNNHAPBLZZVQHP-UHFFFAOYSA-N 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000029142 excretion Effects 0.000 description 1
- 230000003301 hydrolyzing effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000006213 oxygenation reaction Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- WTHDKMILWLGDKL-UHFFFAOYSA-N urea;hydrate Chemical compound O.NC(N)=O WTHDKMILWLGDKL-UHFFFAOYSA-N 0.000 description 1
- 150000003672 ureas Chemical class 0.000 description 1
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- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The utility model relates to a kind of urea hydrolyser for the production of ammonia, belongs to ammonia production unit technical field.The utility model is oval for the production of the cross section of the steam heating tube bank of the urea hydrolyser of ammonia, and described oval-shaped major axis is parallel with horizontal plane; The below of steam heating tube bank is provided with urea soln distribution piping and air distribution, be arranged side by side, and two ends all seals, and has urea soln dispensing orifice and air dispensing orifice, and the air intlet communicating with air distribution is communicated with air compressor by pipeline.The space availability ratio of the utility model hydrolyzer inside is higher, also more reasonable, is beneficial to blowdown, effectively slows down the corrosion of carboxylamine amine to equipment, in the work-ing life of having improved hydrolyzer, has reduced production cost.
Description
Technical field
The utility model relates to a kind of equipment for the production of ammonia, more particularly, the present invention relates to a kind of urea hydrolyser for the production of ammonia, belongs to ammonia production unit technical field.
Background technology
In power plant's production process, can produce a large amount of oxynitride (NO
x), environment is caused to very large pollution, mainly adopt now denitration processing, and the reductive agent using in SCR denitrification process is ammonia, its preparation method mainly contains liquefied ammonia evaporation, hydrolysis of urea, three kinds of modes of urea pyrolysis, the advantages such as urea water solution is safe because having, floor space is little, running cost is low, started progressively to promote in denitrating flue gas field over the past two years.
It is CN103395801A as State Intellectual Property Office discloses a publication number at 2013.11.20 that existing hydrolysis of urea is prepared ammonia system, name is called the patent of invention of " a kind of method and device of urea seeding hydrolysis ", this patent discloses a kind of urea seeding method for hydrolysis and device, by adding the Secondary ammonium phosphate of different proportionings and primary ammonium phosphate as catalyzer in hydrolysis of urea reactor, and the urea soln of 40-50% mass concentration is delivered to hydrolysis of urea reactor, control the temperature of hydrolysis of urea reactor at 150-180 DEG C, pressure is at 0.6-0.8MPa, realize the catalytic hydrolysis of urea.This beneficial effect of the invention is: 1) speed of response comparatively fast can meet the requirement of denitration for ammonia; 2) increased ammonia and revealed safeguard system, pressure, temperature, height of liquid level automatic control system, security is also very high; 3) working cost is low, is the half of pyrolysis.Therefore this invention provides urea seeding method for hydrolysis and device have higher superiority.
In the SCR of existing urea hydrolysis method denitrification process, need above-mentioned a set of hydrolysis of urea system that can continue to produce ammonia, wherein urea hydrolyser is the nucleus equipment in hydrolysis of urea system, security, the stability of its hydrolyzer are most important.Hydrolysis of urea reaction process process is that Mr. becomes ammonium carbamate, then is decomposed and produced carbonic acid gas and ammonia by ammonium carbamate, and ammonium carbamate is the extremely strong processing medium of a kind of corrodibility.If there is no other sfgd.; according to the corrosion data table of " corrosion data and selection handbook " (Chemical Industry Press) the 437th page; 316L stainless steel can not permanent resistance to ammonium carbamate corrosion; power plant is 30 years to service life of equipment general requirement; tradition hydrolyzer only relies on increase hydrolyzer wall thickness can not meet the demands at all, has serious potential safety hazard.
It is CN103482649A that State Intellectual Property Office discloses a publication number in 2014.1.1, name is called the patent of invention of " a kind of urea soln hydrolysis reactor ", this patent provides a kind of urea soln hydrolysis reactor, can accept urea supersaturated solution as carrying out liquid, reduce reactor outlet vapour content, thereby save energy and desalination water consumption.It comprises that bottom arranges respectively the reactor of urea soln opening for feed and reaction solution outlet, and is arranged on the heating unit and the stripper plant that in reactor, set gradually along urea flow direction; Described reactor top arranges the outlet of reaction gas-phase product; Described stripper plant comprises that connection is arranged on the stripped vapor import of reactor bottom, and one end that reactor is stretched in stripped vapor import connects stripped vapor divider.This invention is by the stripper plant arranging, water vapor in stripper plant input reactor is directly contacted with urea soln, not only accelerated the hydrolysis of urea soln, and the ammonia that can accelerate to generate in liquid phase is constantly diffused in gas phase, and output from the outlet of reaction gas-phase product.
It is CN203513298U that State Intellectual Property Office discloses a Granted publication number in 2014.4.2, name is called the utility model patent of " urea soln hydrolyzer ", this patent discloses a kind of urea soln hydrolyzer, still there is dead space volume in the urea soln hydrolyzer that solves prior art, cannot give full play to the effect of hydrolyzer, and the lower problem of hydrolyzer efficiency.This utility model comprises the cylinder of horizontal type structure, the classification being arranged in cylinder regulates interchanger, be arranged at the urea soln import of cylinder bottom, be arranged at the product gas outlet at cylinder top, and be arranged at the urea soln excretion interface of cylinder bottom; One end of described cylinder adopts oblique cone housing to be made.The cylinder of this utility model adopts oblique cone housing to be made, and cylinder is medium pressure vessel, and more conventional cylinder gas dead space volume is less; Decompose simultaneously and regulate interchanger to be made up of plural tube exchanger, can distribute and regulate interchanger according to ammonia requirement, and decompose setter and cylinder employing flange and be connected, it be very convenient to dismantle.
It is CN202430017U that State Intellectual Property Office discloses a Granted publication number in 2012.9.12, name is called the utility model patent of " a kind of urea hydrolyser that is applied to denitrating flue gas ", this patent discloses a kind of urea hydrolyser that is applied to denitrating flue gas, mainly by horizontal reactor cylindrical shell, be arranged at heating coil tube bank and the urea soln divider of described horizontal reactor inner barrel and be arranged on urea soln import and the product gas outlet composition on horizontal reactor cylinder body outer wall, described heating coil tube bank forms semicircle on cross section.Described urea soln divider adopts semicircle stainless-steel pipe, and 2 rounds are opened along steel pipe normal direction in described urea soln divider both sides.This utility model adopts semicircle heating coil, and hot face is covered with whole liquid level as far as possible, reduces even to eliminate local boiling, has avoided the generation of drop, has more ensured the security of denitrating system operation in reducing equipment cost.In addition, this utility model adopts semicircle urea soln divider, can make urea soln in reactor, distribute more equably, has accelerated speed and the homogeneity of heat exchange, has improved reaction efficiency.
Above-mentioned patent is disclosed is all existing urea hydrolyser, and the cross section of first traditional urea hydrolyser steam heating tube bank generally adopts circle or semicircle, and this type of tube bank decoration form makes hydrolyzer internal space utilization ratio low, and liquid-flow is bad.Secondly the urea soln divider of traditional hydrolyzer is positioned at hydrolyzer bottom, connect together with hydrolyzer inwall, be unfavorable for like this blowdown of hydrolyzer, urea itself is with biuret impurity, along with adding of urea soln, biuret is accumulation constantly, and biuret solubleness is lower, when excessive concentration, can be deposited on hydrolyzer bottom, if urea soln divider is positioned at the discharge that hydrolyzer bottom is unfavorable for impurity.The most important thing is, above-mentioned urea hydrolyser of the prior art has stainless steel to be corroded by ammonium carbamate, has the problem of potential safety hazard.
Utility model content
The utility model is for the unreasonable structure of existing urea hydrolyzer, the problem being easily corroded, a kind of urea hydrolyser for the production of ammonia is provided, can make stainless steel do not corroded by ammonium carbamate, improve hydrolyzer internal space utilization ratio simultaneously, make hydrolyzer that the ammonia ability processed of continous-stable is provided.
To achieve these goals, concrete technical scheme of the present utility model is as follows:
A kind of urea hydrolyser for the production of ammonia, comprise hydrolyzer housing, be arranged on described hydrolyzer case top product gas outlet, be arranged on the steam heating tube bank of described hydrolyzer enclosure interior and be arranged on the front end cavity of described hydrolyzer housing front end, it is characterized in that: the cross section of described steam heating tube bank is for oval, and described oval-shaped major axis is parallel with horizontal plane, the below of described steam heating tube bank is provided with urea soln distribution piping and air distribution, described urea soln distribution piping and described air distribution are for being arranged side by side, hydrolyzer housing rear end is pointed in one end, the other end points to front end cavity, and two ends are all sealed, described urea soln distribution piping has multiple urea soln dispensing orifices, the bottom of urea soln distribution piping is communicated with urea soln import, described air distribution has multiple air dispensing orifices, the bottom of air distribution is communicated with air intlet, described air intlet is communicated with air compressor by pipeline.
Front end cavity described in the utility model comprises the steam cavity on top and the steam condensate cavity of bottom, described steam cavity is communicated with steam inlet, the outlet of described steam condensate cavity and steam condensate is communicated with, and described steam cavity and described steam condensate cavity are all restrained and are communicated with described steam heating respectively.
Hydrolyzer case top described in the utility model is provided with head temperature meter interface, pressure tap, interface of the level gauge and relief valve connection.
Hydrolyzer housing bottom described in the utility model is provided with bottom temp meter interface and discharge outlet.
The internal communication of product gas outlet described in the utility model and described hydrolyzer housing, and be provided with gas-liquid separator between described product gas outlet and the inside of described hydrolyzer housing.
Oval-shaped long axis length described in the utility model and minor axis length ratio are 1.5-2.5:1.
Oval-shaped area described in the utility model accounts for the 20-40% of the cross-sectional area of described hydrolyzer housing.
Urea soln dispensing orifice described in the utility model is opened the first half at described urea soln distribution piping, and described air dispensing orifice is opened the Lower Half at described air distribution.
Urea soln dispensing orifice described in the utility model and described air dispensing orifice are 2 row, and equidistantly arrange.
Urea soln dispensing orifice described in the utility model is opened at the top of described urea soln distribution piping, and from the cross section of urea soln distribution piping, urea soln dispensing orifice is with respect to the vertical summetry rotational symmetry of urea soln distribution piping cross section; Described air dispensing orifice is opened the bottom at described air distribution, and from the cross section of air distribution, air dispensing orifice is with respect to the vertical summetry rotational symmetry of air distribution cross section.
The useful technique effect that the utility model brings:
1, the utility model is for the urea hydrolyser unreasonable structure of prior art, the problem being easily corroded, by the arrangement mode of steam heating tube bank is optimized, the cross section of steam heating tube bank is set to the major axis ellipse parallel with horizontal plane, the steam heating of arranging like this tube bank makes the space availability ratio of hydrolyzer inside higher, also more reasonable, both hydrolysis reaction heat transfer needs had been met, can keep enough cushioning pockets of hydrolyzer internal product gas simultaneously as far as possible, and can ensure the good mobility of urea soln, eliminate liquid level top local boiling, improve the ammonia ability processed of hydrolyzer continous-stable.In addition, the utility model is provided with urea soln distribution piping and the air distribution put side by side below steam heating tube bank, and air distribution is connected with air compressor.Urea soln distribution piping is set like this and is beneficial to blowdown, can not cause the deposition of dirt and impurity, and the setting of air distribution and air compressor machine can continue to provide to hydrolyzer inside oxygen, and dissolve in fast urea soln, form dissolved oxygen, make hydrolyzer internal surface form one deck passive film, thereby effectively slow down the corrosion of carboxylamine amine to equipment, improve the work-ing life of hydrolyzer, reduced production cost.Finally, the cross section of steam heating tube bank is set to ellipse also can provide enough spaces to urea soln distribution piping and air distribution, in ensureing the better mobility of urea soln, the passive film distribution that dissolved oxygen is formed at hydrolyzer internal surface is more even, has further improved anticorrosion ability.
2, steam heating tube bank cross section of the prior art is circular or semicircle, because steam heating is restrained below liquid level, and hydrolyzer housing cross section is circular, so steam heating tube bank is circular and semicircular shape of cross section causes horizontal ends to be greater than the distance of steam heating tube bank bottom to inwall to the distance of inwall, is unfavorable for like this liquid-flow.And steam heating tube bank cross section of the present utility model is oval, oval horizontal ends is less than the distance of steam heating tube bank bottom to inwall to the distance of inwall, can make like this urea soln, air form baffling between oval-shaped longitudinal end and hydrolyzer inner walls, accelerate the mixed flow of urea soln, improve Hydrolysis rate of urea, air can make airborne oxygen be dissolved in better in urea soln at this position baffling, promote preservative effect, also can form better equally distributed passive film.
3, the case top of urea hydrolyser of the present utility model is provided with head temperature meter interface, pressure tap, interface of the level gauge and relief valve connection.Hydrolyzer housing bottom is provided with bottom temp meter interface and discharge outlet.Various measurement monitor-interfaces are convenient to be connected on the spot or teletransmission parameter monitoring instrument, can realize the real-time monitoring of various process parameters.On hydrolyzer, be provided with relief valve connection and discharge outlet; urea hydrolyser is pressurized vessel; safety valve in case of emergency can be protected equipment, and discharge outlet can and in emergency circumstances discharge the urea soln in hydrolyzer in maintenance, also can discharge in time dirt and impurity simultaneously.
4, oval-shaped long axis length described in the utility model and minor axis length ratio are 1.5-2.5:1; Oval-shaped area accounts for the 20-40% of the cross-sectional area of described hydrolyzer housing.The utility model is further optimized steam heating tube bank cross section, the limited proportion of long axis length and minor axis length specific shape of cross section, the cross-sectional area that oval area accounts for hydrolyzer housing defines specific cross section size, the space availability ratio that can further optimize like this hydrolyzer inside, being more conducive to hydrolyzer provides the ammonia of stable high-quality amount.
5, urea soln dispensing orifice described in the utility model is opened the first half at described urea soln distribution piping, and described air dispensing orifice is opened the Lower Half at described air distribution; Urea soln dispensing orifice described in the utility model and described air dispensing orifice are 2 row, and equidistantly arrange; Urea soln dispensing orifice described in the utility model is opened at the top of described urea soln distribution piping, and from the cross section of urea soln distribution piping, urea soln dispensing orifice is with respect to the vertical summetry rotational symmetry of urea soln distribution piping cross section; Described air dispensing orifice is opened the bottom at described air distribution, and from the cross section of air distribution, air dispensing orifice is with respect to the vertical summetry rotational symmetry of air distribution cross section.Above-mentioned three kinds of preferred versions can both be optimized the mobility of liquid and air more, form the passive film more uniformly that distributes.
Brief description of the drawings
Fig. 1 is the side cross-sectional structural representation of the utility model urea hydrolyser;
Fig. 2 is the cross-sectional structure schematic diagram of the utility model urea hydrolyser;
Fig. 3 is the urea soln distribution piping of the utility model urea hydrolyser and the cross-sectional structure schematic diagram of air distribution, and wherein urea soln dispensing orifice and air dispensing orifice are all 2 rows;
Fig. 4 is the vertical view of the urea soln distribution piping of the utility model urea hydrolyser;
Fig. 5 is the upward view of the air distribution of the utility model urea hydrolyser.
Reference numeral: 1 is hydrolyzer housing, 2 is product gas outlet, 3 is steam heating tube bank, 4 is front end cavity, 5 is steam cavity, 6 is steam condensate cavity, 7 is steam inlet, 8 is steam condensate outlet, 9 is urea soln distribution piping, 10 is air distribution, 11 is urea soln dispensing orifice, 12 is urea soln import, 13 is air dispensing orifice, 14 is air intlet, 15 is air compressor, 16 is head temperature meter interface, 17 is pressure tap, 18 is interface of the level gauge, 19 is relief valve connection, 20 is gas-liquid separator, 21 is bottom temp meter interface, 22 is discharge outlet.
Embodiment
embodiment 1
A kind of urea hydrolyser for the production of ammonia, comprise hydrolyzer housing 1, be arranged on described hydrolyzer housing 1 top product gas outlet 2, be arranged on the steam heating tube bank 3 of described hydrolyzer housing 1 inside and be arranged on the front end cavity 4 of described hydrolyzer housing 1 front end, the cross section of described steam heating tube bank 3 is oval, and described oval-shaped major axis is parallel with horizontal plane, the below of described steam heating tube bank 3 is provided with urea soln distribution piping 9 and air distribution 10, described urea soln distribution piping 9 and described air distribution 10 are for being arranged side by side, hydrolyzer housing 1 rear end is pointed in one end, the other end points to front end cavity 4, and two ends are all sealed, described urea soln distribution piping 9 has multiple urea soln dispensing orifices 11, the bottom of urea soln distribution piping 9 is communicated with urea soln import 12, described air distribution 10 has multiple air dispensing orifices 13, the bottom of air distribution 10 is communicated with air intlet 14, described air intlet 14 is communicated with air compressor 15 by pipeline.
The utility model is oval by the cross sectional arrangement of steam heating tube bank 3, and described oval-shaped major axis is parallel with horizontal plane.Be arranged as oval middle i.e. 1-2 row steam heating tube quantity maximum, from middle, the quantity of the steam heating tube that evenly successively decreases up and down, forming cross section is oval-shaped steam heating tube bank 3.
The below of the utility model steam heating tube bank 3 is provided with urea soln distribution piping 9 and air distribution 10.Urea soln distribution piping 9 and air distribution 10 are arranged side by side, and top and steam heating tube bank 3 leave space, and below and hydrolyzer housing 1 inwall leave space.The urea soln that enters into urea soln distribution piping 10 from urea soln import 12 is assigned to urea soln dispensing orifice 11, then enters hydrolyzer; The air that enters into air distribution 10 from air intlet 14 is assigned to air dispensing orifice 13, then enters hydrolyzer.In hydrolyzer, urea soln and air mixed.
On pipeline between air compressor 15 described in the utility model and described air intlet 14, can also be disposed with surge tank and air flowmeter.
embodiment 2
A kind of urea hydrolyser for the production of ammonia, comprise hydrolyzer housing 1, be arranged on described hydrolyzer housing 1 top product gas outlet 2, be arranged on the steam heating tube bank 3 of described hydrolyzer housing 1 inside and be arranged on the front end cavity 4 of described hydrolyzer housing 1 front end, the cross section of described steam heating tube bank 3 is oval, and described oval-shaped major axis is parallel with horizontal plane, the below of described steam heating tube bank 3 is provided with urea soln distribution piping 9 and air distribution 10, described urea soln distribution piping 9 and described air distribution 10 are for being arranged side by side, hydrolyzer housing 1 rear end is pointed in one end, the other end points to front end cavity 4, and two ends are all sealed, described urea soln distribution piping 9 has multiple urea soln dispensing orifices 11, the bottom of urea soln distribution piping 9 is communicated with urea soln import 12, described air distribution 10 has multiple air dispensing orifices 13, the bottom of air distribution 10 is communicated with air intlet 14, described air intlet 14 is communicated with air compressor 15 by pipeline.
Further, described front end cavity 4 comprises the steam cavity 5 on top and the steam condensate cavity 6 of bottom, described steam cavity 5 is communicated with steam inlet 7, described steam condensate cavity 6 and steam condensate outlet 8 is communicated with, and described steam cavity 5 and described steam condensate cavity 6 are all restrained 3 with described steam heating respectively and be communicated with.
embodiment 3
A kind of urea hydrolyser for the production of ammonia, comprise hydrolyzer housing 1, be arranged on described hydrolyzer housing 1 top product gas outlet 2, be arranged on the steam heating tube bank 3 of described hydrolyzer housing 1 inside and be arranged on the front end cavity 4 of described hydrolyzer housing 1 front end, the cross section of described steam heating tube bank 3 is oval, and described oval-shaped major axis is parallel with horizontal plane, the below of described steam heating tube bank 3 is provided with urea soln distribution piping 9 and air distribution 10, described urea soln distribution piping 9 and described air distribution 10 are for being arranged side by side, hydrolyzer housing 1 rear end is pointed in one end, the other end points to front end cavity 4, and two ends are all sealed, described urea soln distribution piping 9 has multiple urea soln dispensing orifices 11, the bottom of urea soln distribution piping 9 is communicated with urea soln import 12, described air distribution 10 has multiple air dispensing orifices 13, the bottom of air distribution 10 is communicated with air intlet 14, described air intlet 14 is communicated with air compressor 15 by pipeline.
Described hydrolyzer housing 1 top is provided with head temperature meter interface 16, pressure tap 17, interface of the level gauge 18 and relief valve connection 19.Described hydrolyzer housing 1 bottom is provided with bottom temp meter interface 21 and discharge outlet 22.The internal communication of described product gas outlet 2 and described hydrolyzer housing 1, and be provided with gas-liquid separator 20 between described product gas outlet 2 and the inside of described hydrolyzer housing 1.
The utility model further, on hydrolyzer housing, be provided with the interface of various instrument, convenient connection with regard to ground pressure, teletransmission pressure, liquid phase temperature, gas phase temperature, liquid phase teletransmission temperature, gas phase teletransmission temperature, remote liquid level, safety valve etc. on the spot on the spot, and PLC Controlling System is set.The setting of these instrument can be at the scene and watch-keeping cubicle the running condition of hydrolysis of urea is monitored, PLC Controlling System can be controlled correlation parameter, realizes the automatic control to hydrolysis of urea, responds in time the demand of denitration to reductive agent ammonia.
embodiment 4
A kind of urea hydrolyser for the production of ammonia, comprise hydrolyzer housing 1, be arranged on described hydrolyzer housing 1 top product gas outlet 2, be arranged on the steam heating tube bank 3 of described hydrolyzer housing 1 inside and be arranged on the front end cavity 4 of described hydrolyzer housing 1 front end, the cross section of described steam heating tube bank 3 is oval, and described oval-shaped major axis is parallel with horizontal plane, the below of described steam heating tube bank 3 is provided with urea soln distribution piping 9 and air distribution 10, described urea soln distribution piping 9 and described air distribution 10 are for being arranged side by side, hydrolyzer housing 1 rear end is pointed in one end, the other end points to front end cavity 4, and two ends are all sealed, described urea soln distribution piping 9 has multiple urea soln dispensing orifices 11, the bottom of urea soln distribution piping 9 is communicated with urea soln import 12, described air distribution 10 has multiple air dispensing orifices 13, the bottom of air distribution 10 is communicated with air intlet 14, described air intlet 14 is communicated with air compressor 15 by pipeline.
Described oval-shaped long axis length and minor axis length ratio are 1.5-2.5:1.
Described oval-shaped area accounts for the 20-40% of the cross-sectional area of described hydrolyzer housing 1.
The utility model further, to steam heating restrain the oval-shaped shape of 3 cross section, size has been made further optimization, can make urea soln, air form baffling between oval-shaped longitudinal end and hydrolyzer inner walls, accelerate the mixed flow of urea soln, improve Hydrolysis rate of urea, air can make airborne oxygen be dissolved in better in urea soln at this position baffling, promotes preservative effect, also can form better equally distributed passive film.
embodiment 5
A kind of urea hydrolyser for the production of ammonia, comprise hydrolyzer housing 1, be arranged on described hydrolyzer housing 1 top product gas outlet 2, be arranged on the steam heating tube bank 3 of described hydrolyzer housing 1 inside and be arranged on the front end cavity 4 of described hydrolyzer housing 1 front end, the cross section of described steam heating tube bank 3 is oval, and described oval-shaped major axis is parallel with horizontal plane, described front end cavity 4 comprises the steam cavity 5 on top and the steam condensate cavity 6 of bottom, described steam cavity 5 is communicated with steam inlet 7, described steam condensate cavity 6 and steam condensate outlet 8 is communicated with, and described steam cavity 5 and described steam condensate cavity 6 are all restrained 3 with described steam heating respectively and be communicated with, the below of described steam heating tube bank 3 is provided with urea soln distribution piping 9 and air distribution 10, described urea soln distribution piping 9 and described air distribution 10 are for being arranged side by side, hydrolyzer housing 1 rear end is pointed in one end, the other end points to front end cavity 4, and two ends are all sealed, described urea soln distribution piping 9 has multiple urea soln dispensing orifices 11, the bottom of urea soln distribution piping 9 is communicated with urea soln import 12, described air distribution 10 has multiple air dispensing orifices 13, the bottom of air distribution 10 is communicated with air intlet 14, described air intlet 14 is communicated with air compressor 15 by pipeline.
Described urea soln dispensing orifice 11 is opened the first half at described urea soln distribution piping 9, and described air dispensing orifice 13 is opened the Lower Half at described air distribution 10.
Described urea soln dispensing orifice 11 and described air dispensing orifice 13 are 2 row, and equidistantly arrange.
Described urea soln dispensing orifice (11) is opened the top at described urea soln distribution piping (9), and from the cross section of urea soln distribution piping (9), urea soln dispensing orifice (11) is with respect to the vertical summetry rotational symmetry of urea soln distribution piping (9) cross section; Described air dispensing orifice (13) is opened in the bottom of described air distribution (10), and from the cross section of air distribution (10), air dispensing orifice (13) is with respect to the vertical summetry rotational symmetry of air distribution (10) cross section.
The utility model further specifically defines position and the quantity of two kinds of perforates.The length that two kinds of distribution piping length and steam heating are restrained 3 horizontal components is close or suitable, two kinds of perforates are arranged in the length range of two kinds of distribution pipings, can be distributed in whole length, also can not be distributed in whole length, and urea soln dispensing orifice 11 is opened to the first half at described urea soln distribution piping, described air dispensing orifice 13 is opened the Lower Half at described air distribution 10, can improve liquid fluidity, oxygen is uniformly distributed, and also just makes passive film be uniformly distributed.In addition by uniform two kinds of perforates, 2 row are equidistantly arranged, line symmetry centered by distribution piping cross section symmetry axis again, urea soln dispensing orifice 11 is arranged on urea soln distribution piping 9 tops, air dispensing orifice 13 is arranged on air distribution 10 bottoms, can improve too liquid fluidity, oxygen is uniformly distributed, and passive film can be uniformly distributed.
embodiment 6
Determine under condition in hydrolyzer physical dimension, its internal-response volume is fixed, how reasonable Arrangement hydrolyzer internal heat transfer is restrained, both hydrolysis reaction heat transfer needs had been met, keep enough cushioning pockets of internal tank gas product simultaneously as far as possible, meet to greatest extent power plant's denitrating system to reductive agent preparation facilities continous-stable supply requirement.
Urea soln can be hydrolyzed under certain temperature, pressure condition, generates ammonium carbamate, then is decomposed and produced carbonic acid gas and ammonia by ammonium carbamate, and the mixture that finally contains ammonia, carbonic acid gas and water vapour is delivered to denitration as gas product and uses.
CO（NH
2)
2+H
2O—NH
4COONH
2
NH
4COONH
2—NH
3+CO
2
Hydrolysis of urea process need absorb heat, and steam is by steam tube bundle as the supply of hydrolysis of urea thermal source and keep urea soln certain temperature, and steam is condensed into the steam condensate that temperature is higher in tube bank, can be used as urea soln pipeline tracing and uses.
In hydrolyzer, add air by air compressor machine, and even air is distributed with air distributor, make to have in urea soln the existence of dissolved oxygen always, oxygen in solution becomes oxidisability by urea soln from reductibility, stainless steel can carry out chemical passivation, i.e. Surface Creation oxide film in Oxidant.This layer of oxide film can solution and stainless steel machinery separate, there is passive state of metal, therefore corrosion speed reduces widely.
Ammonium carbamate is a kind of acidic medium of reductibility, and it has strong corrosion effect to stainless steel, and its corrodibility increases along with the increase of concentration.In the time that ammonium carbamate generates or decompose, its corrodibility is larger, and this is owing to wherein absorbing the less cause of oxygen.If contain enough oxygen in solution, stainless corrosion speed is reduced greatly.Oxygen plays critical effect to stainless corrosive nature, and this is because add after oxygen in solution, can make it change oxidisability into by reductibility.Stainless steel can carry out chemical passivation, i.e. Surface Creation oxide film in Oxidant.This layer of oxide film can solution and stainless steel machinery separate, there is passive state of metal, therefore corrosion speed reduces widely.Because solution is a kind of medium of reductibility, in order to maintain stainless steel in passive state, just need toward continuous oxygenation in solution, and require to keep in solution certain oxygen level.If metal is in passive state, as long as the limit reduction current of oxygen is larger than passive metal " tieing up blunt electric current " (being the critical current of metal in passive state), stainless steel continues to keep passive state.The decoration form of flat elliptic up and down that steam heating tube bank adopts, take full advantage of the spatial arrangement tube bank on horizontal both sides, reserved sufficient space to upper and lower both sides simultaneously, the spacing of the flat institute in bottom is as the position of air distributor and urea soln divider, top is flat had both eliminated top and had possessed the drawback of boiling, also provided enough cushioning pockets to gas phase.
(1) can greatly reduce the erosion rate of carboxylamine ammonia to equipment in hydrolytic process, ensure the work-ing life of hydrolyzer; (2) simple to operation, need the processing unit increasing to only have air compressor machine, air compressor machine is always in running status, without other switching and red-tape operati; (3) economy: than relying on increase equipment wall thickness to solve the safety problem of hydrolyzer, the investment of this mode reduces greatly, because the utilization ratio of hydrolyzer internal space improves, has reduced facility investment simultaneously; (4) stable operation, has eliminated local boiling, ammonia continous-stable processed.
Claims (10)
1. the urea hydrolyser for the production of ammonia, comprise hydrolyzer housing (1), be arranged on described hydrolyzer housing (1) top product gas outlet (2), be arranged on the inner steam heating tube bank (3) of described hydrolyzer housing (1) and be arranged on the front end cavity (4) of described hydrolyzer housing (1) front end, it is characterized in that: the cross section of described steam heating tube bank (3) is for oval, and described oval-shaped major axis is parallel with horizontal plane, the below of described steam heating tube bank (3) is provided with urea soln distribution piping (9) and air distribution (10), described urea soln distribution piping (9) and described air distribution (10) are for being arranged side by side, hydrolyzer housing (1) rear end is pointed in one end, the other end points to front end cavity (4), and two ends are all sealed, described urea soln distribution piping (9) has multiple urea soln dispensing orifices (11), the bottom of urea soln distribution piping (9) is communicated with urea soln import (12), described air distribution (10) has multiple air dispensing orifices (13), the bottom of air distribution (10) is communicated with air intlet (14), described air intlet (14) is communicated with air compressor (15) by pipeline.
2. a kind of urea hydrolyser for the production of ammonia according to claim 1, it is characterized in that: described front end cavity (4) comprises the steam cavity (5) on top and the steam condensate cavity (6) of bottom, described steam cavity (5) is communicated with steam inlet (7), described steam condensate cavity (6) and steam condensate outlet (8) is communicated with, and described steam cavity (5) and described steam condensate cavity (6) are distinguished and all restrained (3) with described steam heating and be communicated with.
3. a kind of urea hydrolyser for the production of ammonia according to claim 1, is characterized in that: described hydrolyzer housing (1) top is provided with head temperature meter interface (16), pressure tap (17), interface of the level gauge (18) and relief valve connection (19).
4. according to a kind of urea hydrolyser for the production of ammonia described in claim 1 or 3, it is characterized in that: described hydrolyzer housing (1) bottom is provided with bottom temp meter interface (21) and discharge outlet (22).
5. a kind of urea hydrolyser for the production of ammonia according to claim 1, it is characterized in that: the internal communication of described product gas outlet (2) and described hydrolyzer housing (1), and be provided with gas-liquid separator (20) between described product gas outlet (2) and the inside of described hydrolyzer housing (1).
6. a kind of urea hydrolyser for the production of ammonia according to claim 1, is characterized in that: described oval-shaped long axis length and minor axis length ratio are 1.5-2.5:1.
7. according to a kind of urea hydrolyser for the production of ammonia described in claim 1 or 6, it is characterized in that: described oval-shaped area accounts for the 20-40% of the cross-sectional area of described hydrolyzer housing (1).
8. a kind of urea hydrolyser for the production of ammonia according to claim 1, it is characterized in that: described urea soln dispensing orifice (11) is opened the first half at described urea soln distribution piping (9), described air dispensing orifice (13) is opened the Lower Half in described air distribution (10).
9. according to a kind of urea hydrolyser for the production of ammonia described in claim 1 or 8, it is characterized in that: described urea soln dispensing orifice (11) and described air dispensing orifice (13) are 2 row, and equidistantly arrange.
10. a kind of urea hydrolyser for the production of ammonia according to claim 8, it is characterized in that: described urea soln dispensing orifice (11) is opened the top at described urea soln distribution piping (9), and from the cross section of urea soln distribution piping (9), urea soln dispensing orifice (11) is with respect to the vertical summetry rotational symmetry of urea soln distribution piping (9) cross section; Described air dispensing orifice (13) is opened in the bottom of described air distribution (10), and from the cross section of air distribution (10), air dispensing orifice (13) is with respect to the vertical summetry rotational symmetry of air distribution (10) cross section.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112678847A (en) * | 2020-12-30 | 2021-04-20 | 上海洁昊环保股份有限公司 | Urea coupling hydrolyzer and urea coupling hydrolysis method thereof |
| CN115010148A (en) * | 2022-06-10 | 2022-09-06 | 西安热工研究院有限公司 | Urea catalytic hydrolysis reactor with external ammonia buffer zone |
-
2014
- 2014-06-06 CN CN201420298897.6U patent/CN203922753U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112678847A (en) * | 2020-12-30 | 2021-04-20 | 上海洁昊环保股份有限公司 | Urea coupling hydrolyzer and urea coupling hydrolysis method thereof |
| CN115010148A (en) * | 2022-06-10 | 2022-09-06 | 西安热工研究院有限公司 | Urea catalytic hydrolysis reactor with external ammonia buffer zone |
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Address after: 610000 No. 30, 4th Section of Renmin South Road, Chengdu City, Sichuan Province Patentee after: SICHUAN CHENGUANG ENGINEERING DESIGN INSTITUTE Co.,Ltd. Address before: 610041, No. four, 30 South Renmin Road, Chengdu, Sichuan, Wuhou District Patentee before: SICHUAN CHENGUANG ENGINEERING DESIGN INSTITUTE |
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