WO2021089246A1 - Procédé et installation destinés à la production de granulés d'urée - Google Patents

Procédé et installation destinés à la production de granulés d'urée Download PDF

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Publication number
WO2021089246A1
WO2021089246A1 PCT/EP2020/077326 EP2020077326W WO2021089246A1 WO 2021089246 A1 WO2021089246 A1 WO 2021089246A1 EP 2020077326 W EP2020077326 W EP 2020077326W WO 2021089246 A1 WO2021089246 A1 WO 2021089246A1
Authority
WO
WIPO (PCT)
Prior art keywords
mixing tank
exhaust gas
granulator
urea
washing solution
Prior art date
Application number
PCT/EP2020/077326
Other languages
German (de)
English (en)
Inventor
Marc Wieschalla
Original Assignee
Thyssenkrupp Industrial Solutions Ag
Thyssenkrupp Ag
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Thyssenkrupp Industrial Solutions Ag, Thyssenkrupp Ag filed Critical Thyssenkrupp Industrial Solutions Ag
Priority to JP2022525190A priority Critical patent/JP2022554266A/ja
Priority to EP20781536.6A priority patent/EP4054742A1/fr
Publication of WO2021089246A1 publication Critical patent/WO2021089246A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • B01D53/1418—Recovery of products
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
    • B01D47/14—Packed scrubbers
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C273/00—Preparation of urea or its derivatives, i.e. compounds containing any of the groups, the nitrogen atoms not being part of nitro or nitroso groups
    • C07C273/02—Preparation of urea or its derivatives, i.e. compounds containing any of the groups, the nitrogen atoms not being part of nitro or nitroso groups of urea, its salts, complexes or addition compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
    • B01D2252/10—Inorganic absorbents
    • B01D2252/103—Water
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/50—Improvements relating to the production of bulk chemicals

Definitions

  • the present invention relates to a method for the production of urea granules, in which an exhaust gas stream from a urea granulator is subjected to a dust scrubber in a granulator exhaust gas scrubber and a water-containing scrubbing solution is used for this dust scrubbing, which is partially produced by evaporation of a urea-containing solution from the dust scrubber and subsequent condensation of the vapors obtained from evaporation, the washing solution being generated in at least one mixing tank to which at least two liquid flows of different origins and / or compositions are supplied, one of these liquid flows supplied to the mixing tank being a washing solution from the granulator waste gas scrubber.
  • the granulator exhaust gas scrubbers used in the granulation and also the scrubbers of the fluid bed cooler require fresh water, which can be supplied to the system from the outside or can be taken from the desorption so that the water balance is balanced.
  • EP 2 844 640 B1 describes a method and a plant for producing urea from ammonia and carbon dioxide, in which a urea concentrate is first produced by evaporation, which is then fed to a granulator in which the urea granulate is produced.
  • the exhaust air from the urea granulation is dusty and must therefore be subjected to dust washing.
  • a circulating urea solution can be used as a washing medium in dust washing.
  • fresh water is usually used in the dust washing process. Since the exhaust air from the granulator is hot, some of the water in the dust scrubber evaporates and this loss is replaced by fresh water.
  • a urea stream containing 10% by weight to 60% by weight urea occurs in the dust scrubber and, in order to recover this urea, it is proposed in this patent to feed this urea stream to a second evaporation device in order to concentrate it there and again to the granulator to feed.
  • the exhaust gas flow from this second evaporation device is fed to a second condensation device and the condensate generated in the process is passed into the dust scrubber.
  • the aqueous stream of this condensate contains only a very small proportion of ammonia and / or urea and is therefore considered suitable for dust washing.
  • the dust washing machine is also supplied with additional washing water, which by treating the condensate from a first condensation device in a Condensate treatment device is generated and should not contain any substances harmful to the environment.
  • the object of the present invention is to provide an improved process for the production of urea granules with the features mentioned at the outset, in which one can manage with less expenditure on equipment in the granulator waste gas scrubbing.
  • the washing solution generated by mixing at least two liquid flows in the mixing tank is fed to the granulator waste gas washer without prior renewed evaporation and condensation.
  • a mixing tank can also be provided.
  • only two liquid streams are fed to this mixing tank, one of these streams being a washing solution from the granulator exhaust gas scrubber.
  • a second solution is a solution that is obtained when cleaning the urea granulator.
  • both solutions that are fed to the mixing tank are heavily contaminated with urea. It is therefore proposed in the prior art to first evaporate the urea-containing solutions combined in the mixing tank, the concentrated solution thus obtained being returned to the urea granulation process in the usual way. The vapors produced during evaporation, on the other hand, are condensed and the condensate is then fed to the granulator exhaust gas scrubber.
  • a mixing tank is thus used, but the mixed solution that arises in it is heavily loaded with urea and consequently cannot be used again directly in the dust scrubber in the granulator exhaust gas scrubber. Rather, a preparation is through Evaporation and subsequent condensation required, for which the corresponding additional facilities in the system are required.
  • the present invention pursues a different approach.
  • This provides for the use of a mixing tank, to which a washing solution contaminated with urea from the granulator exhaust gas scrubber is also fed, but this mixing tank is supplied with further aqueous liquid flows that are not or at least less heavily contaminated with urea, so that the contaminated washing solution is diluted in the mixing tank .
  • This has the advantage that such a dilute solution can be returned to the granulator exhaust gas washer immediately and used there as a fresh washing solution for a new dust wash.
  • the mixing tank is used to produce a washing solution that can be used as a circulating washing solution, i.e.
  • At least three liquid streams of different origins and / or different compositions are fed to the mixing tank.
  • fresh water can also be fed to the mixing tank, for example.
  • fresh water is used as the third liquid stream, which is fed to the mixing tank in order to achieve a further dilution to the desired concentration, so that a solution with a correspondingly low concentration of urea and possibly other impurities is produced in the mixing tank can absorb a sufficient amount of dust and possibly other substances to be washed out and for this purpose can be fed back into the granulator waste gas scrubbing system.
  • the measures according to the invention thus produce a washing solution in the mixing tank that is suitable as a circulating washing solution and can circulate directly between the mixing tank and the granulator washer, i.e. this washing solution can be used as often as required and always flows from the mixing tank into the granulator washer and from it again into the mixing tank.
  • urea-contaminated solution goes from the granulator washer to a mixing tank, but then from this mixing tank to an evaporation and only the condensate from the evaporation then goes back to the granulator washer.
  • the known solution there is no direct connection between the mixing tank and the granulator washer and only two solutions are added to the mixing tank, both of which are loaded with urea and are therefore unsuitable for direct reuse in the granulator exhaust gas washer.
  • At least two of the liquid streams fed to the mixing tank are aqueous solutions which arise in the plant for the production of urea granules.
  • One of these two solutions is the urea-contaminated scrubbing solution from the granulator exhaust gas scrubber.
  • Another of the at least three liquid streams fed to the mixing tank can be, for example, a condensate from the condensation of vapors produced during the evaporation of a urea-containing solution.
  • plants of this type for the production of urea granules with exhaust gas scrubbing of the urea-containing dusts generated during production usually include at least one evaporation and condensation, by means of which a solution from the dust scrubbing is concentrated in order to recover the urea contained therein and to use it again for the production of further urea granules.
  • this liquid flow from the condensation is at least partially fed to the mixing tank, because it is suitable for diluting the used and thus more urea-containing scrubbing solution from the dust scrubber that is also fed to the mixing tank, since the process condensate mainly consists of water.
  • a dilute washing solution is created in the mixing tank, which contains a lower percentage of urea and can consequently be used again for the dust washing of the dusts from the urea granulator.
  • the granulator exhaust gas scrubber can, for example, be subdivided into a dust stage, which is located in the lower part, and an acidic stage, which is located in the upper part.
  • the liquid from the mixing tank can then circulate through the acidic stage and not through the dust stage.
  • a portion of used scrubbing solution can, for example, be discharged from the granulator exhaust gas scrubber in the lower area and fed to an evaporation system in the system in order to concentrate the solution and then feed the urea contained in it again to the urea granulator for the production of further urea granules.
  • This evaporation produces vapors which can then be condensed and the process condensate obtained in this way can, according to the invention, at least partially be fed to the mixing tank in order to dilute the circulating washing solution that is processed in the mixing tank.
  • At least one of the at least three liquid flows supplied to the mixing tank is fresh water.
  • fresh water for example, which is supplied to the system from outside.
  • At least one of the at least three liquid flows fed to the mixing tank is a circulating washing solution from the granulate waste gas washer, which is fed directly to the mixing tank from the granulator waste gas washer.
  • the term “directly” means that the washing solution from the granulator exhaust gas scrubber, which contains a higher concentration of urea due to the washing process, is not first subjected to evaporation and condensation, but is derived from the granulate exhaust gas scrubber and without a such processing is fed to the mixing tank, since according to the invention the process of processing the contaminated washing solution is a mixing / dilution process that is carried out in the mixing tank.
  • the washing solution generated by mixing at least two liquid streams in the mixing tank is transferred directly from the mixing tank via a line to the Granulator exhaust gas scrubber supplied, that is, a direct connection line is provided between the mixing tank and the granulator exhaust gas scrubber, which does not lead via an intermediate evaporation.
  • the aim of the solution according to the invention is to use the mixing tank to mix the liquid flows supplied to it with one another in such proportions that a mixed solution is generated which is optimized in terms of its specification and concentration for direct subsequent use in the granulator waste gas scrubbing.
  • the mixing tank so that the circulating washing solution from the granulator waste gas scrubbing, which is more or less heavily loaded with urea, can be mixed with unpolluted solutions as required and thus diluted. If, for example, there is not enough process condensate available, it can also be mixed with fresh water that may be supplied to the system from outside.
  • This preferred variant makes the method according to the invention very flexible, since the respective relative ratios of the volume flows fed to the mixing tank to one another can be adapted to the respective desired concentration of the washing solution and can be varied as desired.
  • the washing solution generated in the mixing tank is preferably introduced into the upper region of the granulator exhaust gas washer via a direct connecting line between the mixing tank and the granulator exhaust gas washer.
  • the washing solution generated in the mixing tank is preferably conveyed to the granulator exhaust gas washer via a pump arranged in the line from the mixing tank to the granulator exhaust gas washer.
  • At least the line supplying fresh water to the mixing tank can be shut off via a shut-off device, in particular a valve.
  • a shut-off device in particular a valve.
  • the concentration of urea in the circulating washing solution and possibly other dissolved substances can be measured and a sufficient volume of process condensate and / or fresh water can be supplied to the mixing tank in accordance with the result of the measurement.
  • the. Circulating washing solution coming from the granulator exhaust gas scrubber and fed to the mixing tank is conveyed via a storage volume integrated in the granulator exhaust gas washer or via a separate storage tank.
  • the urea-containing solution is evaporated at negative pressure and the condensate resulting from the condensation of the vapors formed during evaporation is preferably fed directly to the mixing tank in order to dilute the circulating washing solution also fed to the mixing tank in the mixing tank.
  • One advantage of this variant of the method according to the invention is that a separate storage tank, in which the condensers are immersed, is no longer required in the prior art for the process condensate that occurs during the condensation of the vapors, because this function is now performed by the mixing tank, in which the circulating washing solution from the granulator exhaust gas scrubber is diluted with condensate.
  • the fresh water preferably also supplied to the mixing tank can be used in the same way as the condensate to dilute the circulating washing solution supplied to the mixing tank from the granulator exhaust gas scrubber in the mixing tank so that it can be used again in the granulator exhaust gas scrubber as a washing solution for dust washing. It is advisable to supply as little fresh water as possible from the outside, so that fresh water is only supplied when the degree of dilution by means of the available volume of process condensate is no longer sufficient.
  • the present invention also relates to a plant for the production of urea granules, in particular for use in a method of the type described above, comprising a urea granulator, a granulator exhaust gas scrubber in which an exhaust gas stream from the urea granulator is dusted, at least one device for evaporation of one of these Water-containing washing solution obtained by dust washing, at least one condensation device for condensing the vapors obtained during evaporation, as well as at least one mixing tank for generating and receiving a water-containing washing solution, to which at least two liquid flows of different origins and / or composition are supplied, one of these liquid flows supplied to the mixing tank being a Is washing solution from the granulator exhaust gas scrubber and, according to the invention, at least three lines for liquid flows lead to the mixing tank, at least one of these lines being one Line for condensate is that leads from the condensation device directly to the mixing tank.
  • a urea granulator preferably at least
  • At least three differently composed liquid flows and / or at least three liquid flows of different origins are fed to the mixing tank via separate lines and mixed in the mixing tank, namely a urea-containing washing solution from the granulator exhaust gas scrubber, a process condensate from a previous evaporation of a urea-containing solution and subsequent condensation of the Vapors and fresh water produced during evaporation, preferably from outside the system.
  • At least one line for a dilute washing solution generated in the mixing tank leads from the mixing tank directly to the granulator exhaust gas scrubber without the interposition of evaporation and / or condensation.
  • the washing solution diluted in the mixing tank is fed back to the granulator exhaust gas scrubber via this line, whereby further processing is not necessary due to the dilution.
  • a circulating washing solution is generated, which is fed from the granulator exhaust gas washer to the mixing tank, diluted there as required and then returned directly to the granulator exhaust gas washer as a washing solution.
  • FIG. 1 shows a schematically simplified system scheme of an exemplary system according to the invention for scrubbing an exhaust gas flow from a urea granulator with dust, the system units shown preferably being part of a system for producing urea granules.
  • the plant comprises a urea granulator 10 in which a urea-based fertilizer granulate is produced from a urea melt or a concentrated urea solution, for example by fluidized bed granulation.
  • a urea-based fertilizer granulate is produced from a urea melt or a concentrated urea solution, for example by fluidized bed granulation.
  • the production of urea granules, for example in a fluidized bed granulator, is known per se from the prior art and is therefore not explained in any further detail at this point.
  • One in urea granulation Dust-containing and / or ammonia-containing exhaust gas flow arising in the urea granulator 10 is fed via a line 11 and optionally by means of a blower to a granulator exhaust gas scrubber 12, in which dust is washed out of the exhaust gas flow by means of a scrubbing solution.
  • the cleaned exhaust gas can, for example, be discharged from the granulator exhaust gas scrubber 12 via the exhaust gas line 13 by means of a fan 17 in the upper area and, for example, fed to a chimney 14 or, if necessary, further processed in some other way.
  • the washing solution is supplied to the granulator exhaust gas scrubber 12 via a line 15 which emanates from a mixing tank 16 in which the washing solution is mixed and leads from this mixing tank 16 into an upper region of the granulator exhaust gas scrubber 12.
  • a mixer is preferably installed in line 15, and the acid can be added shortly before this mixer.
  • the acid can be added, for example, via line 24 into line 15, which leads to granulator waste gas scrubber 12.
  • the washing solution 15 is passed in the granulator exhaust gas washer 12, preferably in countercurrent to the exhaust gas flow to be cleaned, the fresh washing solution being fed to the granulator exhaust gas washer 12 via line 15 in the upper area and the urea-loaded washing solution from the granulator exhaust gas washer 12 in the lower area via line 19 is discharged, while the exhaust gases are introduced into the granulator exhaust gas scrubber 12 in the lower area via line 11 and the cleaned exhaust gas in the upper area is discharged from the granulator exhaust gas scrubber 12 via line 13.
  • the solution of the upper acid scrubber is also contaminated with acid residues, with hardly any free acid left, but rather a product of ammonia and acid.
  • sulfuric acid is used, which then reacts to form ammonium sulfate, whereby ammonium sulfate can be granulated with urea.
  • other acids can also be used, for example nitric acid, which produces ammonium nitrate.
  • washing solution accumulates which is contaminated with urea and which is discharged from the granulator exhaust gas scrubber 12 via the line 19 and fed directly to the mixing tank 16.
  • this urea-loaded washing solution is diluted by mixing with further aqueous liquid streams and then it is conveyed via the line 15 by means of the pump 25 and fed back to the granulator exhaust gas scrubber 12 as a renewed washing solution for a further washing process.
  • the washing solution prepared in the mixing tank 16 is a circulating washing solution which is used several times and which circulates from the mixing tank 16 via the line 15 to the granulator exhaust gas scrubber 12 and from there via the line 19 back to the mixing tank 16.
  • the washing solution discharged from the granulator exhaust gas scrubber 12 in the lower area via the line 18 can be directed to an evaporation facility, which is not shown here. There, the washing solution is evaporated, whereby a concentrated urea-containing and optionally ammonium sulfate-containing solution or a solution containing a product of another acid and ammonia is generated, which can be returned to the urea granulator 10 so that the urea contained therein is used for the production of further urea granulate is used.
  • the vapors produced during this evaporation are condensed in a condensation device, also not shown here, and the condensate obtained is fed to the mixing tank 16 via the line 20.
  • This condensate is thus an aqueous solution which is obtained in the process itself and can be used in the mixing tank 16 for diluting the washing solution loaded with urea, so that the diluted washing solution is then returned to the granulator exhaust gas scrubber 12 via the line for a further washing process 15 can be supplied.
  • fresh water can also be supplied to the mixing tank 16 via a further line 21.
  • This fresh water can, for example, be fed to the system from outside via the line 22, via which fresh water can also be fed to the granulator exhaust gas scrubber 12.
  • the line 21 for fresh water branches off from the line 22 and leads to the mixing tank 16, a valve 23 preferably being provided in the line 21 so that the fresh water supply to the mixing tank 16 can be shut off and the mixing tank 16 only then with fresh water for additional dilution can supply if necessary.
  • fresh water When “fresh water” is mentioned in the present application, it may also be water which, for example, comes from the desorption of a urea synthesis and which may also contain ammonia and / or urea in very small amounts. It does not always have to be 100% pure water. However, water from a pipe network can of course also be fed into the mixing tank as "fresh water”.
  • the mixing tank 16 is thus designed for a supply of at least three liquid streams of different origins, which flow into the mixing tank 16 via the lines 20, 21 and 19.
  • This is on the one hand the circulating urea-containing scrubbing solution from the granulator exhaust gas scrubber 12, on the other hand the condensate which is fed to the mixing tank 16 via line 20 and thirdly the fresh water which reaches the mixing tank 16 via line 21. So you have very flexible Possibilities of diluting the urea-containing solution from the granulator exhaust gas scrubber 12 in the mixing tank to a greater or lesser extent as required.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Treating Waste Gases (AREA)
  • Fertilizers (AREA)
  • Gas Separation By Absorption (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

La présente invention concerne un procédé de production de granulés d'urée, dans lequel un flux de gaz d'échappement (11) à partir d'un granulateur d'urée (10) est soumis à un processus d'épuration dans un épurateur de gaz d'échappement de granulateur (12) et une solution d'épuration aqueuse (20) est utilisée pour ledit processus d'épuration des poussières, la solution d'épuration aqueuse ayant été obtenue en partie par évaporation d'une solution contenant de l'urée à partir du processus d'épuration des poussières et condensation ultérieure des vapeurs obtenues pendant l'évaporation, la solution d'épuration étant produite dans au moins un réservoir de mélange (16) auquel au moins deux flux de liquide d'origine différente et/ou de composition sont introduits, l'un de ces flux de liquide (19) alimentant le réservoir de mélange (16) étant une solution d'épuration provenant de l'épurateur de gaz d'échappement de granulateur (12). Selon l'invention, une solution d'épuration (15) produite par mélange d'au moins deux flux de liquide dans la cuve de mélange (16) est renvoyée dans l'épurateur de gaz d'échappement de granulateur (12) sans évaporation préalable et condensation de celle-ci.
PCT/EP2020/077326 2019-11-04 2020-09-30 Procédé et installation destinés à la production de granulés d'urée WO2021089246A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2022525190A JP2022554266A (ja) 2019-11-04 2020-09-30 尿素造粒物の製造方法及び製造プラント
EP20781536.6A EP4054742A1 (fr) 2019-11-04 2020-09-30 Procédé et installation destinés à la production de granulés d'urée

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102019216931.7A DE102019216931A1 (de) 2019-11-04 2019-11-04 Verfahren und Anlage zur Herstellung von Harnstoffgranulat
DE102019216931.7 2019-11-04

Publications (1)

Publication Number Publication Date
WO2021089246A1 true WO2021089246A1 (fr) 2021-05-14

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ID=72670752

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2020/077326 WO2021089246A1 (fr) 2019-11-04 2020-09-30 Procédé et installation destinés à la production de granulés d'urée

Country Status (4)

Country Link
EP (1) EP4054742A1 (fr)
JP (1) JP2022554266A (fr)
DE (1) DE102019216931A1 (fr)
WO (1) WO2021089246A1 (fr)

Citations (6)

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US3985523A (en) * 1974-09-30 1976-10-12 Foster Wheeler Energy Corporation Pollution control process for fertilizer plant
DE10346519A1 (de) * 2003-10-02 2005-05-04 Uhde Gmbh Verfahren zur Entfernung von Ammoniak und Staub aus einem Abgas, das bei der Herstellung von Düngemitteln anfällt
EP2192099A1 (fr) * 2008-11-28 2010-06-02 Uhde Fertilizer Technology B.V. Processus de granulation d'urée avec un système d'épuration acide et intégration successive de sel d'ammonium dans des granules d'urée
CN107983058A (zh) * 2018-01-19 2018-05-04 西安同大实业股份有限公司 高塔造粒粉尘引流雾化洗涤除尘雾装置
EP2844640B1 (fr) 2012-05-03 2018-08-29 Stamicarbon B.V. Installation de production d'urée
US20190256432A1 (en) 2016-10-13 2019-08-22 Koch Agronomic Services Llc Recovery and reuse of components from urea finishing waste streams

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CA1070930A (fr) * 1974-09-30 1980-02-05 Philip F. Kaupas Depollution d'une usine de produits fertilisants
US4424072A (en) * 1982-07-01 1984-01-03 Lerner Bernard J Prilling
DE3712494A1 (de) * 1987-04-13 1988-11-03 Mark Efremovic Ivanov Verfahren zum granulieren von mineralischen duengemitteln
EP2301917A1 (fr) * 2009-09-16 2011-03-30 Stamicarbon B.V. Élimination de l'urée et de l'ammoniac de gaz d'échappement
ITMI20130847A1 (it) * 2013-05-24 2014-11-25 Saipem Spa Metodo e sistema per il recupero di solfato di ammonio da un flusso gassoso di un impianto urea
EP3562784B8 (fr) * 2016-12-30 2022-12-07 Yara International ASA Procédé de traitement d'un flux de gaz contenant de la poussière d'urée et de l'ammoniac

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3985523A (en) * 1974-09-30 1976-10-12 Foster Wheeler Energy Corporation Pollution control process for fertilizer plant
DE10346519A1 (de) * 2003-10-02 2005-05-04 Uhde Gmbh Verfahren zur Entfernung von Ammoniak und Staub aus einem Abgas, das bei der Herstellung von Düngemitteln anfällt
EP2192099A1 (fr) * 2008-11-28 2010-06-02 Uhde Fertilizer Technology B.V. Processus de granulation d'urée avec un système d'épuration acide et intégration successive de sel d'ammonium dans des granules d'urée
EP2844640B1 (fr) 2012-05-03 2018-08-29 Stamicarbon B.V. Installation de production d'urée
US20190256432A1 (en) 2016-10-13 2019-08-22 Koch Agronomic Services Llc Recovery and reuse of components from urea finishing waste streams
CN107983058A (zh) * 2018-01-19 2018-05-04 西安同大实业股份有限公司 高塔造粒粉尘引流雾化洗涤除尘雾装置

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JP2022554266A (ja) 2022-12-28
EP4054742A1 (fr) 2022-09-14
DE102019216931A1 (de) 2021-05-06

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