WO2018197281A1 - Dispositif et procédé de lavage de gaz d'échappement, et système d'urée avec lavage de gaz d'échappement - Google Patents

Dispositif et procédé de lavage de gaz d'échappement, et système d'urée avec lavage de gaz d'échappement Download PDF

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Publication number
WO2018197281A1
WO2018197281A1 PCT/EP2018/059826 EP2018059826W WO2018197281A1 WO 2018197281 A1 WO2018197281 A1 WO 2018197281A1 EP 2018059826 W EP2018059826 W EP 2018059826W WO 2018197281 A1 WO2018197281 A1 WO 2018197281A1
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WO
WIPO (PCT)
Prior art keywords
sprayed
spraying
exhaust gas
spray
gaseous
Prior art date
Application number
PCT/EP2018/059826
Other languages
German (de)
English (en)
Inventor
Helmut Gehrke
Martina Schmitz
Stephan Buß
Original Assignee
Thyssenkrupp Industrial Solutions Ag
Thyssenkrupp Ag
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Filing date
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Application filed by Thyssenkrupp Industrial Solutions Ag, Thyssenkrupp Ag filed Critical Thyssenkrupp Industrial Solutions Ag
Publication of WO2018197281A1 publication Critical patent/WO2018197281A1/fr

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    • 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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/77—Liquid phase processes
    • B01D53/79—Injecting reactants
    • 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
    • B01D53/18—Absorbing units; Liquid distributors therefor
    • 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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/54—Nitrogen compounds
    • B01D53/58—Ammonia
    • 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
    • C07C273/14—Separation; Purification; Stabilisation; Use of additives
    • C07C273/16—Separation; Purification
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/20—Reductants
    • B01D2251/206—Ammonium compounds
    • B01D2251/2062—Ammonia
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/30—Alkali metal compounds
    • B01D2251/304—Alkali metal compounds of sodium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/30—Alkali metal compounds
    • B01D2251/306—Alkali metal compounds of potassium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/40—Alkaline earth metal or magnesium compounds
    • B01D2251/404—Alkaline earth metal or magnesium compounds of calcium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/50—Inorganic acids
    • B01D2251/502—Hydrochloric acid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/50—Inorganic acids
    • B01D2251/504—Nitric acid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/50—Inorganic acids
    • B01D2251/506—Sulfuric acid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/50—Inorganic acids
    • B01D2251/512—Phosphoric acid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/60—Inorganic bases or salts
    • B01D2251/604—Hydroxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/20—Halogens or halogen compounds
    • B01D2257/204—Inorganic halogen compounds
    • B01D2257/2047—Hydrofluoric acid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/30—Sulfur compounds
    • B01D2257/302—Sulfur oxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/40—Nitrogen compounds
    • B01D2257/404—Nitrogen oxides other than dinitrogen oxide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/50—Carbon oxides
    • B01D2257/504—Carbon dioxide
    • 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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/60—Simultaneously removing sulfur oxides and nitrogen oxides
    • 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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/62—Carbon oxides
    • 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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/68—Halogens or halogen compounds
    • 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
    • Y02P20/151—Reduction of greenhouse gas [GHG] emissions, e.g. CO2

Definitions

  • the invention relates to a method for the removal of gaseous chemical compounds from an exhaust gas, wherein at least one gaseous chemical compound is converted by reaction with a washing solution in an aqueous liquid phase, wherein an exhaust gas is passed through a horizontal channel having a washing area, wherein in the washing area, there is disposed a surface enlarging structure which extends in the vertical direction and which is sprayed with the washing solution.
  • the invention further relates to an apparatus for removing gaseous chemical compounds from an exhaust gas, wherein at least one gaseous chemical compound can be converted into an aqueous liquid phase by a reaction with a washing solution, wherein an exhaust gas can be guided through a horizontal channel which forms a washing area wherein in the washing area a surface enlarging structure is arranged, which extends in the vertical direction and which can be sprayed by means of a spray device with the washing solution.
  • Such methods and devices are known from the prior art and may for example be integrated in a urea plant.
  • the device is intended to remove gaseous ammonia by integration into the aqueous liquid phase in a washing area by using an acidic washing solution which forms ammonium by reaction and then leads to the removal of ammonia accordingly.
  • nozzle sticks in each case a plurality of nozzles are arranged horizontally in a plane.
  • the nozzle sticks are preferably distributed vertically over the height.
  • This incomplete ammonia leaching may cause the purified effluent leaving the apparatus to exceed the maximum permissible limits for ammonia (typically less than 30 mg / Nm 3 in the US, but less than 50 mg / Nm 3 otherwise).
  • WO 99/20371 A1 describes a similar washing device for the removal of sulfur dioxide, sulfur trioxide, hydrogen chloride or nitrogen oxides from flue gases, in which the gas flows through a horizontal chamber, in the upper region of which spraying devices are arranged, which are inclined at an inclined angle in spray the channel and into the gas stream to be washed, with mist eliminators spaced from the spraying devices.
  • spraying vertically falling curtains are to be generated across the gas flow.
  • the sprayed-in washing liquid is partially entrained by the gas stream and it is possible that, due to the spray angle, portions of the washing liquid reach the structure of the droplet separator directly.
  • a droplet separator is again arranged, by means of which the liquid is removed from the gas stream, so that a carbon dioxide-depleted gas stream is obtained.
  • the object is achieved by a method for removing gaseous chemical compounds from an exhaust gas, wherein at least one gaseous chemical compound is converted by reaction with a washing solution in an aqueous liquid phase, wherein an exhaust gas is passed through a horizontal channel having a washing area wherein in the washing area a surface enlarging structure is arranged, which extends in the vertical direction and which is sprayed with the washing solution, wherein
  • the second spray rate is equal to zero, so that here too the first spray rate is greater than the second spray rate.
  • an upper section of the surface enlarging structure is thus sprayed with a larger spraying rate than a lower section of the surface enlarging structure, wherein the second spraying rate is zero in said special case or else can assume any values greater than zero.
  • the spray rate is understood to mean the sprayed amount of wash solution per unit time and area sprayed.
  • the washing solution sprayed onto the surface enlarging structure can be downwardly moved by the influence of gravity from the upper portion and increase the layer thickness of the washing solution film in the lower portion of the surface enlarging structure. This results in a substantially uniform layer thickness profile of the wash solution film over the entire surface enlargement structure, in particular in the vertical direction. In this respect, the distribution of the amount of washing solution in the surface enlarging structure, in particular in the vertical direction, is substantially uniform.
  • substantially uniform wash solution film is obtained, in particular in the vertical direction, substantially uniform exhaust gas velocity through the surface enlargement structure, so that, in particular in the vertical direction, substantially uniform removal of the at least one gaseous chemical compound is realized ,
  • a method is provided with improved efficiency over the prior art.
  • the second spray rate is at least 5% of the first spray rate, or at least 10% or at least 15% or at least 20% or at least 25% or at least 30% or at least 35% or at least 40% or at least 45% or at least 50% or at least 55% or at least 60% or at least 65% or at least 70% or at least 75% or at least 80% or at least 85% or at least 90% or at least 95%.
  • the second spray rate is at most 5% of the first spray rate, or at most 10% or at most 15% or at most 20% or at most 25% or at most 30% or at most 35% or at most 40% or at most 45% or at most 50% or maximum 55% or maximum 60% or maximum 65% or maximum 70% or maximum 75% or maximum 80% or maximum 85% or maximum 90% or maximum 95%.
  • the device according to the invention is intended to separate gaseous chemical compounds which are present in the exhaust gas and which can be integrated into an aqueous liquid phase by an acid-base reaction, in order to prevent officially prescribed threshold values from being exceeded in the exhaust gas emitted by the device - the.
  • the wash solution is an acidic wash solution.
  • the acidic wash solution comprises sulfuric acid, nitric acid, hydrochloric acid, phosphoric acid, or mixtures of sulfuric acid, nitric acid, hydrochloric acid and / or phosphoric acid, or mixtures of sulfuric acid, nitric acid, hydrochloric acid, phosphoric acid and / or urea solution.
  • the wash solution is a base.
  • the wash solution comprises a strong and / or a weak base.
  • the wash solution preferably comprises a strong inorganic and / or a weak inorganic and / or a strong organic and / or a weak organic base.
  • the washing solution preferably comprises sodium hydroxide (NaOH), potassium hydroxide (KOH), ammonia solutions and / or calcium hydroxide (Ca (OH) 2 ).
  • the washing solution preferably comprises mono-, bi- and / or trifunctional amines, more preferably MDEA (methyldiethanolamine).
  • the surface enlarging structure is designed as an installation in the washing area of the channel, which leads to a corresponding enlargement of the surface, but opposes little resistance to the exhaust gas flowing in the transport direction due to the generated pressure loss.
  • the surface enlarging structure preferably comprises random packings and / or structured packings.
  • the surface enlargement structure comprises random beds selected from the group consisting of Raschig rings, saddles, spirals, and combinations thereof.
  • the surface augmentation structure comprises structured packings selected from the group consisting of fabric packs, sheet metal packings, expanded metal packings, plastic packs, grid packings and combinations thereof.
  • the surface augmentation structure comprises random beds selected from the group consisting of Raschig rings, saddles, spirals, and combinations thereof, and structured packings selected from the group consisting of fabric packs, sheet metal packings, expanded metal packs, plastic packs, grid packings, and combinations thereof.
  • the surface enlargement structure comprises random structure elements selected from the group consisting of Raschig rings, Pall rings, saddle bodies, spring-type bodies and combinations thereof; and or
  • structured structural elements selected from the group consisting of sheets, corrugated sheets, shaped sheets and combinations thereof; and or
  • the surface enlarging structure in particular exclusively, is sprayed by means of a spraying device arranged above the surface enlarging structure.
  • the surface enlarging structure in particular exclusively, is sprayed by means of a spraying device arranged laterally of the surface enlarging structure.
  • the spraying device may be arranged in front of the surface enlarging structure in the transport direction of the exhaust gas, so that the sprayed washing solution is entrained by the exhaust gas in the direction of the surface enlarging structure. It is possible for the surface enlarging structure to be sprayed both by means of a spraying device arranged above the surface enlarging structure and by means of a spraying device arranged laterally of the surface enlarging structure.
  • a preferred embodiment provides that a middle section arranged between the upper section and the lower section of the surface enlargement structure is sprayed with a third spray rate, wherein the third spray rate is less than the first spray rate and greater than the second spray rate. This means that the spray rate decreases from the upper section, through the middle section to the lower section.
  • the spraying device has one or more upper spray nozzles for spraying the upper portion of the surface enlarging structure and one or more lower spraying nozzles for spraying the lower portion of the surface enlarging structure.
  • the upper spray nozzles are connected to one another via a common upper distributor tube and are incorporated in their construction. On and dimensioning identical, so that the spray rates of the upper spray nozzles are identical.
  • the lower spray nozzles can be connected to each other via a common lower manifold, wherein preferably the spray rates of these spray nozzles can be adjusted independently of the spray rates of the nozzles in the upper nozzle.
  • the spraying device has one or more central spray nozzles for spraying a middle portion of the surface enlarging structure disposed between the upper portion and the lower portion of the surface enlarging structure.
  • the central spray nozzles are connected to one another via a common middle distributor pipe, so that the spray rate of the middle spray nozzles is identical.
  • the spraying device comprises more than three distributor tubes, which are arranged spaced apart in the vertical direction, wherein each distributor tube is in each case connected to a plurality of spray nozzles.
  • at least one spray nozzle is a hollow cone nozzle.
  • at least one spray nozzle is a full cone nozzle.
  • At least one spray nozzle is a flat jet nozzle.
  • at least one spray nozzle is a full jet nozzle.
  • at least one spray nozzle is a spiral nozzle.
  • at least one spray nozzle is a spray nozzle.
  • the spray nozzles are of the same type. Alternatively, the spray nozzles may be of different types.
  • the exhaust gas is an exhaust gas of a urea plant and the at least one chemical compound is gaseous ammonia.
  • the exhaust gas of the urea plant is guided in a horizontal direction through the washing area.
  • the at least one chemical compound is selected from the group consisting of gaseous NO, gaseous NO 2 , gaseous SO 2 , gaseous CO 2 , a gaseous inorganic fluorine compound and combinations thereof.
  • a device for removing gaseous chemical compounds from an exhaust gas wherein at least one gaseous chemical compound can be converted into an aqueous liquid phase by a reaction with a washing solution (22), an exhaust gas being conveyed through a horizontal channel ( 5) is feasible, which has a washing area (12), wherein in the washing area (12) a surface enlargement structure (3) is arranged, which extends in the vertical direction and which is sprayable with the washing solution (22) by means of a spraying device (2), wherein the spraying device (2) is designed such that
  • an upper portion of the surface enlarging structure (3) is sprayable at a first spraying rate and a lower portion of the surface augmenting structure (3) is sprayable at a second spraying rate, the first spraying rate being greater than the second spraying rate.
  • a possible preferred variant of the invention provides that only an upper section of the surface enlarging structure (3) can be sprayed by means of the device.
  • the device described above be used for the removal of gaseous chemical compounds from an exhaust gas of a urea plant.
  • the same advantages as in the method according to the invention can be achieved.
  • the device In the case of the urea plant, the device is intended to remove gaseous ammonia in the washing area by integration into the aqueous liquid phase, by using an acidic washing solution which forms ammonium by reaction with ammonia and then leads to the removal of ammonia.
  • FIG. 1 is a schematic top view of a waste gas scrubbing apparatus according to a first exemplary embodiment of the present invention.
  • FIG. 2 shows a schematic side view of the washing area of the device for exhaust gas scrubbing according to FIG.
  • FIG. 3 shows a schematic side view of a washing area of an apparatus for waste gas scrubbing according to a second exemplary embodiment of the present invention.
  • FIG. 4 shows a schematic side view of a washing area of a device for waste gas scrubbing according to a third exemplary embodiment of the present invention.
  • FIG. 5 shows a schematic side view of a washing area of a device for waste gas scrubbing according to the prior art.
  • FIG. 1 shows in a plan view schematically a device for waste gas scrubbing according to a first exemplary embodiment of the present invention.
  • a device 1 which is installed in a urea plant and with the purpose of pursuing the exhaust gas to remove ammonia so far that its remaining proportion in the exhaust gas is below a critical or officially prescribed threshold.
  • the exhaust gas is introduced via an inlet opening 10 into a channel 5 of the device 1 and guided in the transport direction T through the channel.
  • the removal of ammonia takes place in the washing area 12.
  • the cleaned exhaust gas leaves the device 1 via the outlet opening 20.
  • a dust-collecting area can optionally be arranged, in which dust present in the exhaust gas is deposited.
  • the surface enlarging structure 3 arranged in the washing area 12 is sprayed with a washing solution 22 by means of a spraying device 2.
  • the device comprises a spray device 2 with a plurality of distributor tubes 30, at which individual spray nozzles 31 are arranged at a distance from each other.
  • a spray device 2 with a plurality of distributor tubes 30, at which individual spray nozzles 31 are arranged at a distance from each other.
  • the spraying device has at least one further distribution pipe, which is arranged below the upper distributor pipe 30. Via the spray nozzles 31 of the upper manifold, an upper portion of the surface enlarging structure 3 is sprayed.
  • the surface enlarging structure 3 is continuously sprayed with the washing solution 22, so that a liquid film is formed along one side, in particular along a side facing the spraying device 2, of the surface enlarging structure 3.
  • the surface enlarging structure 3 is sprayed with washing solution 22 such that the washing solution 22 uniformly spreads on the surface enlarging structure 3 and thereby a washing solution film having a substantially uniform along at least one side of the surface enlarging structure 3 Layer thickness forms.
  • the upper portion of the surface enlarging structure 3 is sprayed with a first spraying rate
  • a lower portion of the surface enlarging structure 3 is sprayed with a second spraying rate, the first spraying rate being greater than the second spraying rate.
  • This type of spraying counteracts an irregular or disadvantageous layer thickness distribution, in particular caused by gravity, in which in one section a wash solution film formed by the wash solution 22 on the surface enlargement structure 3 is thinner than in another section and, consequently, higher Adjust gas velocity in this section with the thinner wash solution film.
  • This phenomenon can be observed in the prior art device shown in FIG.
  • the layer thickness 41 of the wash solution film is applied above the height of the surface enlargement structure 3. Further, the gas velocity 42 is plotted against the height of the surface enlargement structure 3.
  • FIG. 2 shows a schematic side view of the washing area of the device for exhaust gas scrubbing according to FIG. 1, which is configured in accordance with an exemplary embodiment of the present invention.
  • the surface enlarging structure 3, which is sprayed with a washing solution 22, is used for waste gas scrubbing.
  • the surface of the surface enlarging structure 3 sprayed by the spraying devices 2 is substantially vertical.
  • the upper section 3.1 of the surface enlargement structure 3 is sprayed via the upper spray nozzles 31.1 with a first spray rate and the lower section 3.2 of the surface enlargement structure 3 is sprayed via the lower spray nozzles 31 .2 with a second spray rate, the first spray rate being greater than the second spray rate , Characterized in that the surface enlargement structure 3 is sprayed from the upper spray nozzles 31.1 of the spray device 2 with a larger spray rate than from the lower spray nozzles 31.2, during spraying a substantially uniform layer thickness 41 of the wash solution film is realized in the vertical direction.
  • the gas velocity 42 is distributed substantially uniformly in the vertical direction. The distribution of the gas velocity in the vertical direction is further visualized by the arrows 32.
  • two further groups of spray nozzles are arranged between the upper spray nozzles 31 .1 and the lower spray nozzles 31.2.
  • the spray rate of these other groups of spray nozzles is chosen such that the spray rate decreases starting from the upper spray nozzles 31.1 downwards.
  • FIG. 3 schematically shows a washing area of an apparatus for waste gas scrubbing according to a second exemplary embodiment of the present invention.
  • the spraying apparatus is arranged such that only an upper portion of the surface enlarging structure 3 is sprayed.
  • the spraying device 2 is arranged such that the washing solution 22 is sprayed onto the surface enlarging structure 3 substantially in a direction predetermined by the gravity direction.
  • the washing solution 22 is put on the front surface of the surface enlarging structure 3 and then flows down along the surface enlarging structure 3 under the influence of gravity to form a washing solution film having a substantially uniform layer thickness.
  • a process for removing gaseous chemical compounds from an exhaust gas may be performed, wherein at least one gaseous chemical compound is converted to an aqueous liquid phase by a reaction with a scrubbing solution 22, an exhaust gas passing through a horizontal channel 5 is guided, which has a washing area 12, wherein in the washing area 12 is disposed a surface enlarging structure 3 extending in the vertical direction and which is sprayed with the washing solution 22, spraying only an upper portion of the surface enlarging structure 3 or spraying an upper portion of the surface enlarging structure 3 with a first spraying rate and a lower portion of FIG Surface magnification structure 3 is sprayed with a second spray rate, wherein the first spray rate is greater than the second spray rate.
  • FIG. 4 shows an embodiment in which part of the washing solution is added via the top side of the surface enlarging structure and another part of the washing solution is added via the front side.
  • the surface enlarging structure 3 is sprayed by means of a spraying device 2 arranged above the surface enlarging structure 3 and additionally by means of a spraying device 2 arranged laterally of the surface enlarging structure 3.
  • the upper section 3.1 of the surface enlarging structure 3 is sprayed with a first spraying rate and the lower section 3.2 of the surface enlarging structure 3 is sprayed with a second spraying rate, wherein the first spraying rate is greater than the second spraying rate.

Abstract

La présente invention concerne un procédé d'élimination de composés chimiques gazeux d'un gaz d'échappement. Au moins un composé chimique gazeux est converti en une phase liquide aqueuse par une réaction avec une solution de lavage (22). Un gaz d'échappement est guidé à travers un conduit horizontal (5) pourvu d'une zone de lavage (12). La zone de lavage (12) contient une structure d'agrandissement de surface (3) qui s'étend dans la direction verticale et qui est aspergée avec la solution de lavage (22). Une partie supérieure de la structure d'agrandissement de surface (3) est aspergée à un premier débit d'aspersion et une partie inférieure de la structure d'agrandissement de surface (3) est aspergée à un deuxième débit d'aspersion, le premier débit d'aspersion étant supérieur au deuxième débit d'aspersion.
PCT/EP2018/059826 2017-04-25 2018-04-18 Dispositif et procédé de lavage de gaz d'échappement, et système d'urée avec lavage de gaz d'échappement WO2018197281A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017108845.8A DE102017108845A1 (de) 2017-04-25 2017-04-25 Vorrichtung und Verfahren zur Abgaswäsche sowie Harnstoffanlage mit einer Abgaswäsche
DE102017108845.8 2017-04-25

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WO2018197281A1 true WO2018197281A1 (fr) 2018-11-01

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WO (1) WO2018197281A1 (fr)

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CN111992015B (zh) * 2020-07-24 2022-08-19 中国瑞林工程技术股份有限公司 一种烟气脱硫方法及系统

Citations (8)

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US3957464A (en) * 1974-04-25 1976-05-18 Teller Environmental Systems, Inc. Process for removing particulates from a gas
US5403568A (en) * 1993-03-05 1995-04-04 Dravo Lime Company Horizontal wet scrubbing apparatus and method for removing sulfur dioxide from a gaseous stream
WO1999020371A1 (fr) 1997-10-22 1999-04-29 Clue As. Laveur permettant de traiter les gaz d'echappement
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