EP2026895A1 - Dispositif de refroidissement de gaz (dispositif d'abaissement rapide de température) avec formation d'un condensat corrosif - Google Patents

Dispositif de refroidissement de gaz (dispositif d'abaissement rapide de température) avec formation d'un condensat corrosif

Info

Publication number
EP2026895A1
EP2026895A1 EP07725454A EP07725454A EP2026895A1 EP 2026895 A1 EP2026895 A1 EP 2026895A1 EP 07725454 A EP07725454 A EP 07725454A EP 07725454 A EP07725454 A EP 07725454A EP 2026895 A1 EP2026895 A1 EP 2026895A1
Authority
EP
European Patent Office
Prior art keywords
gas
condensate
resistant
pressure
contact
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP07725454A
Other languages
German (de)
English (en)
Inventor
Helmut Diekmann
Lutz c/oBayer Tech and Eng GOTTSCHALK (Shanghai) Co. Ltd
Kaspar Hallenberger
Gerhard Ruffert
Knud Werner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Covestro Deutschland AG
Original Assignee
Bayer MaterialScience 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 Bayer MaterialScience AG filed Critical Bayer MaterialScience AG
Publication of EP2026895A1 publication Critical patent/EP2026895A1/fr
Withdrawn legal-status Critical Current

Links

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
    • 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
    • B01D53/002—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 condensation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
    • B01D5/0003—Condensation of vapours; Recovering volatile solvents by condensation by using heat-exchange surfaces for indirect contact between gases or vapours and the cooling medium
    • B01D5/0012—Vertical tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
    • B01D5/0033—Other features
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28B—STEAM OR VAPOUR CONDENSERS
    • F28B1/00—Condensers in which the steam or vapour is separate from the cooling medium by walls, e.g. surface condenser
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
    • F28F19/02—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/16—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
    • F28F19/02—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings
    • F28F19/04—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings of rubber; of plastics material; of varnish
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
    • F28F19/02—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings
    • F28F19/06—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings of metal

Definitions

  • the present invention relates to an apparatus for cooling hot gases (quench) to form a corrosive condensate comprising a pressure-resistant container and at least one corrosion resistant internal gas guide tube, and a method of cooling gases forming corrosive condensates using said apparatus ,
  • quenching the device according to the invention is therefore sometimes also referred to herein as quenching.
  • Quenching generally involves the hot gas with a comparatively large amount of cooling medium, which is also the actual.
  • the resulting condensates are often highly corrosive, but contact with the still hot dry gas with the materials of the quencher in general is not a problem yet, but corrosion problems arise where hot condensed moist phase in contact with the materials of the quench is coming. in these areas, temperatures must be above prevented from about 110 0 C in particular, since otherwise corrosion.
  • the solution to this problem is achieved by providing a device for cooling hot gases (quench), which has a pressure-resistant wall and at least one corrosion-resistant, inner gas guide tube.
  • a device for cooling hot gases which has a pressure-resistant wall and at least one corrosion-resistant, inner gas guide tube.
  • pressure-resistant wall and corrosion-resistant, inner gas guide tube By using a combination of pressure-resistant wall and corrosion-resistant, inner gas guide tube, it is possible to largely protect the pressure-resistant but not corrosion-resistant wall from the effect of condensed phase at higher temperature and thus to reduce their corrosive effect.
  • the quenches can first be operated under pressure and, on the other hand, conventional low-cost materials, such as the customary steel alloys used in boiler and apparatus construction, can be used as pressure-resistant materials.
  • Hot gases according to the invention means in particular those having a temperature of about 100 to 2000 ° C, preferably those of a temperature in the range of 110 to 1000 0 C.
  • This may be, for example, exhaust gases and flue gases from combustion processes of all kinds, are formed in their condensation with water highly corrosive liquids. It may also be hot process gases of chemical synthesis processes, such as the process gas of a Deacon process (catalyzed oxidation of HCl with oxygen to form chlorine and water), etc.
  • the inventive quench it is possible the hot gases mentioned, depending on the inlet temperature, for example, below 100 0 C (temperature at the gas outlet of the quench) cool.
  • the invention relates to a device for cooling hot gases (quench), which has a pressure-resistant wall and at least one corrosion-resistant, inner gas guide tube.
  • a device for cooling hot gases at least comprising a gas inlet, a pressure-resistant container with the pressure-resistant wall, a contact zone, a sump region and a head portion for receiving a condensate, an outlet for the cooled gas, a pumped circulation, the condensate from the Marsh area over one
  • Heat exchanger in the head area calls, with the contact zone of one or more
  • Contact tubes consists in which condensate is brought into contact with the hot gas and wherein the contact tube forms the corrosion-resistant inner gas guide tube.
  • the new device which is characterized in that the gas inlet in the sump region and the gas outlet is mounted in the head region of the container, so that the gas in the contact tube in countercurrent with the condensate in the contact tube is brought into contact. Also preferred is an alternative device in which the gas inlet in the head region and the gas outlet is mounted in the sump region of the container, so that the gas is brought into contact with the condensate in the contact tube in the co-current.
  • the pressure-resistant wall of the device consists of a material selected from the group consisting of: steel, steel alloys, in particular chromium, nickel or molybdenum, tantalum and tantalum alloys, the materials optionally with plastic or other metallic materials or at least partially coated.
  • the corrosion-resistant inner gas guide tube is particularly preferably made of a material which is selected from the group consisting of: graphite and modifications thereof, ceramics, in particular silicon carbide and silicon nitride, of quartz glass or of plastics, in particular fluorine-containing polymers, particularly preferably from Tetrafluoro-fluoroalkoxy vinyl ether copolymer (PFA), polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF) or poly (ethylene-chlorotrifluoroethylene) (ECTFE).
  • PFA Tetrafluoro-fluoroalkoxy vinyl ether copolymer
  • PTFE polytetrafluoroethylene
  • PVDF polyvinylidene fluoride
  • ECTFE poly (ethylene-chlorotrifluoroethylene)
  • the gas inlet nozzle is pressure-resistant and thermally insulated and / or heated.
  • the sump region and / or the head region of the container has an additional corrosion-resistant wall or coating at least in the parts touched by the gas.
  • the intermediate space between the pressure-resistant wall and the corrosion-resistant wall can be acted upon with a protective gas, in particular with inert gas.
  • Another particularly preferred embodiment of the device is designed so that the gas guide tubes are surrounded in operation on its outside by cooled condensate, which flows into the gas guide tubes at the upper end of the gas guide tubes.
  • Another particularly preferred embodiment of the device is designed so that the pressure-resistant wall is in operation at least partially in contact with the condensate.
  • Another particularly preferred embodiment of the device is designed so that condensate is in operation between the pressure-resistant wall and the gas guide tubes.
  • the new device characterized in that in the upper part of the gas guide tubes nozzles for injecting and In particular, atomization of cooled condensate are arranged, wherein, in particular during operation, the gas to be cooled is conducted in cocurrent to the condensate.
  • Another object of the invention is the use of the device according to the invention for cooling hot, corrosive gases.
  • the hot gases have a temperature in the range of 100 to 2000 0 C, preferably in the range of 110 to 1000 0 C.
  • the hot gas is a product gas of a catalyzed gas phase oxidation of HCl and oxygen and most preferably contains HCl and water.
  • the invention further relates to a method for cooling hot gases, in particular a temperature in the range of 100 to 2000 0 C using the aforementioned device according to the invention, characterized in that the hot gas is passed in countercurrent or co-current through the gas or the guide tubes of the device and cooled by contact with the condensate.
  • Preferred is a method, characterized in that the pressure of the gas-liquid contact zone is up to 1000 bar.
  • the gas to be cooled contains hydrogen chloride and water and in particular product gas is a gas phase oxidation of HCl with oxygen, wherein the gas is cooled in the region of the gas guide tubes until condensation of HCl and water.
  • the device according to the invention has a pressure-resistant wall.
  • Pressure-resistant according to the invention means in particular pressure-resistant above an overpressure of 0.5 bar, preferably above 6 bar, more preferably above 10 bar up to a pressure of about 1000 bar.
  • the pressure-resistant wall of the device is preferably made of a material which is selected from the group of conventional steel alloys used in boiler and apparatus construction, also from materials that may be deliberately alloyed with chromium, nickel, molybdenum, as well as materials such Tantalum and alloys whose resistance is further enhanced by bonding with precious metals such as platinum and / or palladium.
  • These conventional materials may also be lined with plastics such as in particular fluorine-containing polymers, such as PFA, PTFE, PVDF, HALAR types etc. or with metallic materials such as tantalum.
  • the device according to the invention has at least one corrosion-resistant, internal gas guide tube. If in the present application the terms "gas guide tube” or
  • Gas guide tubes are used, this always means one or more gas guide tubes.
  • the gas guide tubes serve to the hot gas, which also consists of a pressure-resistant Gas inlet nozzle into the quench reaches to absorb and cool it. As a result, in particular, the contact of the hot condensed phase with the pressure-resistant, but generally not corrosion-resistant outer wall is already largely avoided.
  • the gas guide tubes are arranged generally vertically in the device according to the invention in general.
  • the corrosion-resistant internal gas guide tubes are preferably made of a material selected from the group consisting of: graphite and modifications thereof, ceramics such as silicon carbide, silicon nitride, silica glass, plastics such as fluorine-containing polymers such as PFA, PTFE, PVDF, Halar types etc.
  • the corrosion-resistant, internal gas guide tubes are generally made of a material that is not pressure-resistant, ie in particular overpressures above 0.5 bar, or especially above about 6 bar does not resist.
  • the device according to the invention makes it possible to combine inexpensive materials to form a pressure-resistant, corrosion-resistant device.
  • the device according to the invention generally has a likewise pressure-resistant gas inlet connection.
  • the gas inlet nozzle must be pressure-resistant, but need not be made of a particularly corrosion-resistant material, since the incoming hot not yet condensed, dry gas is generally non-corrosive. The corrosiveness occurs only when condensed especially wet aqueous phase meets at elevated temperatures on the particular metallic material. If necessary, the gas inlet can be heated to prevent condensation of the incoming gas already in this area.
  • the gas inlet port is located in the DC-powered embodiment in the device according to the invention expediently above the corrosion-resistant, inner gas guide tubes and is not in contact with the circulating coolant to prevent corrosion of the gas inlet port.
  • the device according to the invention preferably provides means which avoid contact of the pressure-resistant wall with condensed phase at higher temperatures of more than 110 0 C.
  • These are generally the areas of the device in which relatively high temperatures occur, such as in particular more than 110 0 C in a humid environment, as is the case for example in Figure 3 in the area between the gas inlet 3 and pressure-resistant wall 5.
  • a preferred apparatus of the invention is used as a means to contact of corrosion prone parts of the device, in particular the pressure-resistant wall with - o - condensed phase at higher temperatures, in particular more than 110 0 C to avoid a feed line for a barrier or inert gas in the range between pressure-resistant wall and gas inlet nozzle used.
  • the barrier gas prevents hot entering gas from coming in contact with the corrosion prone parts in the presence of condensed phase.
  • FIG. 3 shows a preferred embodiment of this means for a cocurrently operated quench according to the invention.
  • flow line devices such as the inner cone 7, can additionally be provided in order to avoid the contact of hot gas with the wall in the area of the cooling liquid.
  • FIG. 1 A further preferred embodiment of this means for a counter-current operated quench according to the invention is shown in FIG.
  • a preferred sealing gas in the device according to the invention may be, for example, an inert gas, such as nitrogen or a noble gas.
  • an inert gas such as nitrogen or a noble gas.
  • it is preferably oxygen, which is already present in this process gas in large quantities anyway.
  • the corrosion-resistant gas guide tubes are at least partially surrounded by a cooling liquid.
  • This cooling fluid furthermore preferably enters the gas guide tubes at the upper part of the gas guide tubes.
  • the cooling liquid is taken up and pumped or returned after cooling in the device.
  • the device according to the invention is generally such that at least one part, generally the greater part of the pressure-resistant wall, is in contact with the circulating cooling liquid. As a result, it is effectively prevented that in this area corrosion of the generally not or little corrosion-resistant pressure-retaining wall takes place, since the required temperatures in these areas are generally not achieved.
  • the device according to the invention is designed such that the circulating cooling liquid is located between the pressure-resistant wall and the gas guide tubes, which enters the gas guide tubes at the upper end and is collected and pumped around at the bottom.
  • water or an aqueous acid such as dilute hydrochloric acid
  • other process-specific detergents such as alcohols or aqueous amine solutions are conceivable.
  • the incoming hot gas is passed in cocurrent to the cooling liquid.
  • a cocurrent operated device according to the invention has these in addition to the upper part of the gas guide tubes nozzles for injecting the cooling liquid.
  • the incoming hot gas is passed in countercurrent to the cooling liquid.
  • the inventive apparatus is, in general, for the cooling of hot gases to a temperature in the range of 100 to 2000 ° C, preferably in the range 110-1000 0 C (measured at the gas inlet port) is suitable.
  • the device according to the invention is generally such that it is suitable for operation at overpressures in the range from 0.5 to 1000 bar, preferably at 6 to 1000 bar.
  • the invention further relates to a method of cooling hot gases using the apparatus described above and below.
  • This process can preferably be operated in an overpressure range between 6 and 1000 bar.
  • the temperature of the entering gas is preferably in the range of 110 to 1000 ° C.
  • FIG. 1 shows a schematic representation of a special device according to the invention operated countercurrently by liquid and gas to be quenched, as can be used, for example, for the cooling according to the invention of hot, partially or completely condensing gases having corrosive properties of the hot condensate.
  • the hot gas stream 1 containing, inter alia, hydrogen chloride and water (nitrogen 11% by weight, oxygen 27% by weight, carbon dioxide 9% by weight, chlorine 39% by weight, water 9% by weight, and hydrogen chloride 5% by weight), enters the lower Part (bottom portion 31) of the quench apparatus 2 a. After cooling and condensation, the cold gas stream 3 exits through the outlet 33 at the upper part (head region 32). In the middle part of the quencher 2, the gas stream is passed through tubes 4.
  • the tubes are in a liquid 5, here hydrochloric acid, which consists of collected, cooled condensate of the gas stream 1.
  • the tubes 4 are taken on their underside in a tube plate 20. At their upper end they are fixed by a support grid 24.
  • This support grid allows a free passage of the liquid 5.
  • the liquid 5 is conveyed from the sump 6 of the quenches 2 via a circulation line 7 with the pump 8 in its middle part.
  • the liquid enters through the flange 25 at the lower end of the tubes 4 in the quenches 2 again. Excess liquid 9 is withdrawn.
  • the heat exchanger 10 serves to cool the liquid in the circulation line.
  • the liquid 5 runs at the upper end of the tubes 4 into this and runs down the tube inside in countercurrent to the ascending gas flow.
  • the gas stream is now cooled by the down-flowing liquid and its condensable constituents partially or completely condensed.
  • the nozzle 12 is protected by a heating against it, that on him the incoming gas condensed.
  • a heating medium such as steam, or hot water or a heat transfer oil.
  • the heating medium can be withdrawn again.
  • An alternative heating option would be, for example, an electrical heating conductor, which could be wound around the nozzle 12.
  • the tubes 4 must have a clear distance from the neck 12. This is solved in Figure 1 in that the tubes 4 do not fill the entire cross section of the quencher 2, but only a part. This part is dimensioned so that a splash guard 17 between pipe 12 and pipes 4 can be installed. This splash guard is acted upon on one side with hot gas and on the other with condensate. Therefore, it can not be ruled out that the condensate heats up and assumes a temperature that leads to a corrosive attack on the material of the splash guard. Since the splash guard is not a wall to the outside, he is not asked to be pressure-resistant. It can therefore be made of a material that is not pressure resistant, but is very stable to hot, corrosive liquids such as hot hydrochloric acid. For example, for silicon carbide or silicon nitride or other suitable ceramic materials or plastics in question.
  • the middle part of the quench 2, in which the tubes 4 are arranged is flooded with cold condensate.
  • the cold condensate in contrast to the hot condensate, is not so corrosive that suitable metallic materials that are pressure-resistant but not too corrosion-resistant can be used for this purpose.
  • Tube sheet 20 flows through and reaches the wall 13, the tube 18 is pressed with a spring construction 21 to the tube sheet 20.
  • a sealing gas 23 is passed into the space between the lower wall 13 and the pipe 18 via the nozzle 22.
  • This sealing gas may be an inert gas such as nitrogen or argon, but it could also be air or carbon dioxide used.
  • the type of barrier gas depends on its suitability in the process for which the quench is used.
  • another particularly suitable seal gas may be oxygen, since this gas is used in the process for the oxidation of HCl gas to chlorine and therefore does not represent a foreign component.
  • the barrier gas now prevents a portion of the gas stream 1, after it has left the nozzle 12, between the pipe 18 and wall 13 flows.
  • the gas flow is prevented by the sealing gas 23 can flow only through the gap between the tube sheet 20 and pipe 18 and through the gap between the nozzle 12 and the opening in the pipe 18 into the interior of the quencher. Since it has to flow through these two gaps, it prevents the incoming gas 1 from flowing through the two gaps in the opposite direction.
  • the tube sheet 20 is protected by a bundle of measures against hot, corrosive condensate.
  • the cooled condensate On one side of the tube plate 20 is the cooled condensate, which also cools the tubesheet. Although hot gases may condense on the other side, the cooling of the tube bottom forms a cold condensate film which provides protection against the hot, corrosive liquid condensed thereon.
  • the tubesheet can be contain a copper core, which has a particularly high thermal conductivity and thus leads to a particularly small temperature difference between the cool side of the tube plate on which the cooled condensate is, and the hot side, where the gas condenses.
  • the tube sheet itself is cooled.
  • it can be made from two discs, with groove-shaped channels being incorporated into one side of the first disc.
  • the second disc is then placed on the side of the first disc, in which the channels are incorporated.
  • the tube sheet now has channels through which a coolant can flow.
  • the tubes 4 are not flush in the tube sheet 20 inserted, but protrude a bit out of the tube sheet.
  • the hot gases are not passed directly to the tubesheet in the tubes, but at a distance to it.
  • This has the advantage that the hot gases at the inlet into the tubes have no direct contact with the tubesheet.
  • the point at which the tubes 4 are passed through the tube sheet 20 protected by a liquid film against the high gas temperature.
  • the tubes 4 themselves are exposed to attack by corrosive, hot condensates. But since they, like the splash guard 17 and the pipe 18 need not be pressure-bearing, they can be made of the same materials as these.
  • Figure 3 shows a schematic diagram of an apparatus for the cooling according to the invention of hot, partially or even completely condensable gases, in which the gas to be cooled and the gas to be condensed and the cooling liquid are conducted in direct current.
  • the apparatus sketched in the cited figure and described in more detail below can be used in particular for the cooling and condensation of gases whose hot condensates, e.g. aqueous hydrochloric acid, have corrosive properties.
  • the gas 1 to be cooled or condensed enters the upper part 32 of the quench apparatus 2 via a nozzle 3 designed as a plug-in tube. From there, the still hot gas passes directly into a corrosion-resistant inner tube 4 of the apparatus. Since this component does not have to be pressure-resistant, but merely dimensionally stable, temperature-resistant plastics are also suitable here in addition to, for example, ceramic materials.
  • the insertion tube 3 and the inner tube 4 are arranged concentrically with each other, the inner diameter of the insertion tube 3 is typically slightly smaller, but at most as large as that of the corrosion-resistant inner tube 4.
  • cooling liquid. 6 which is pumped continuously.
  • the cooling liquid 6 passes over and forms on the inside of the inner tube 4 a film which on the one hand protects the corrosion-resistant material of the inner tube 4 from excessive temperatures and on the other hand provides a cold surface for the cooling and condensation of the hot gas ,
  • the vertical distance between the insertion tube 3 for the gas supply and the corrosion-resistant inner tube 4 must therefore be so large that an unhindered drainage of the liquid over the inner tube upper edge is ensured even in fluctuating operating conditions.
  • a dry barrier gas 8 is constantly conveyed into the space above the gap, so that a sufficiently cold gas cushion forms and the hot gas to be cooled is forced into the inner tube 4.
  • An additionally installed inner cone 7 made of corrosion-resistant material ensures an advantageous flow guidance for the sealing gas.
  • the selection of a suitable barrier gas 8 is essentially dependent on the circumstances of the overall process. In principle, however, inert gases such as nitrogen or argon, but also air or carbon dioxide, appear to be possible. In the special case of an HCl oxidation process (Deacon process), it makes sense to use oxygen as the sealing gas 8, since it is required in the oxidation of HCl gas to chlorine anyway in the process and therefore does not represent an additional component.
  • an additional heating for example by means of heating steam or electrical energy to provide.
  • one or more spray nozzles 10 are arranged, with the aid of cooling liquid is finely dispersed in the gas space.
  • the arrangement of spray nozzles can also take place in several levels with each other. This results in an intensive contact of the gas to be cooled and condensed with the cooling medium, which leads to a sudden drop in temperature and to a partial or possibly complete condensation of the gas.
  • the spray nozzles 10 and the feed pipe and nozzle attachment itself located in the inner pipe 4 are to be made of a temperature-resistant and simultaneously corrosion-resistant material, since here, similar to the gas inlet region of the inner pipe 4, the hot gas strikes components wetted by coolant or condensate.
  • the supply line to the spray nozzles in the vicinity of the pressure-resistant outer wall 5 can be made of the same material, as these themselves, since the temperature is approximately at that of the coolant.
  • a complete, pressure-tight seal in the region of the passage of the supply line to the spray nozzles 10 through the inner tube 4 is not required.
  • the now cooled gas passes together with the cooling liquid or the condensate in the lower part of the quench apparatus which serves for the separation of gas and liquid phase. This is the first time that there is contact between gas or condensate and the pressure-resistant outer wall 5 of the apparatus. Due to the already carried out cooling of gas and condensate in the inner tube 4, however, the use of a material is possible, which is corrosion-resistant at a significantly lower temperature than that of the hot gas.
  • the non-condensed, but cooled gas 11 leaves the apparatus via a gas outlet 12.
  • Facilities for guiding the gas flow 13, for example baffles, can in this case ensure that as little condensate or coolant liquid as possible is discharged with the gas stream.
  • the separated from the cooled gas gas is collected in the sump 14 of the apparatus and withdrawn from there by means of a pump 15.
  • a portion of the liquid is first conveyed as a coolant via a circulation line to a heat exchanger 17, cooled there to a predetermined temperature level and finally fed back to the spray nozzles 10 and the overflow between pressure-resistant jacket 5 and inner tube 4 as a coolant.
  • a suitable control ensures that the amount of coolant in the system remains approximately constant.
  • the amount of liquid resulting from the condensation as excess is withdrawn as condensate 16.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

La présente invention concerne un dispositif de refroidissement de gaz chauds (dispositif d'abaissement rapide de température) avec formation d'un condensat corrosif, lequel dispositif est constitué d'un réservoir résistant à la pression et d'au moins un tube intérieur d'alimentation en gaz résistant à la corrosion. Cette invention concerne également un procédé de refroidissement de gaz formant des condensats corrosifs, lequel procédé est mis en oeuvre au moyen du dispositif susmentionné.
EP07725454A 2006-05-23 2007-05-23 Dispositif de refroidissement de gaz (dispositif d'abaissement rapide de température) avec formation d'un condensat corrosif Withdrawn EP2026895A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102006024547 2006-05-23
DE102007020145A DE102007020145A1 (de) 2006-05-23 2007-04-26 Vorrichtung zum Abkühlen von Gasen (Quenche) unter Bildung eines korrosiven Kondensats
PCT/EP2007/004554 WO2007134844A1 (fr) 2006-05-23 2007-05-23 Dispositif de refroidissement de gaz (dispositif d'abaissement rapide de température) avec formation d'un condensat corrosif

Publications (1)

Publication Number Publication Date
EP2026895A1 true EP2026895A1 (fr) 2009-02-25

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP07725454A Withdrawn EP2026895A1 (fr) 2006-05-23 2007-05-23 Dispositif de refroidissement de gaz (dispositif d'abaissement rapide de température) avec formation d'un condensat corrosif

Country Status (8)

Country Link
US (1) US20070289722A1 (fr)
EP (1) EP2026895A1 (fr)
JP (1) JP2009537790A (fr)
KR (1) KR20090031371A (fr)
DE (1) DE102007020145A1 (fr)
RU (1) RU2008150586A (fr)
TW (1) TW200815088A (fr)
WO (1) WO2007134844A1 (fr)

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US20070289722A1 (en) 2007-12-20
KR20090031371A (ko) 2009-03-25
TW200815088A (en) 2008-04-01
JP2009537790A (ja) 2009-10-29
RU2008150586A (ru) 2010-06-27
DE102007020145A1 (de) 2007-11-29
WO2007134844A1 (fr) 2007-11-29

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