EP1419221A2 - Method for scavenging precoolers of a coking plant - Google Patents

Method for scavenging precoolers of a coking plant

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Publication number
EP1419221A2
EP1419221A2 EP20020764842 EP02764842A EP1419221A2 EP 1419221 A2 EP1419221 A2 EP 1419221A2 EP 20020764842 EP20020764842 EP 20020764842 EP 02764842 A EP02764842 A EP 02764842A EP 1419221 A2 EP1419221 A2 EP 1419221A2
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EP
European Patent Office
Prior art keywords
tar
naphthalene
precooler
precoolers
liquid phase
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.)
Granted
Application number
EP20020764842
Other languages
German (de)
French (fr)
Other versions
EP1419221B1 (en
Inventor
Frank Rossa
Horst Schröder
Hans-Josef Giertz
Friedrich Wilhelm Cyris
Franz Liesewitz
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Deutsche Montan Technologie GmbH
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Deutsche Montan Technologie GmbH
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Publication date
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Publication of EP1419221A2 publication Critical patent/EP1419221A2/en
Application granted granted Critical
Publication of EP1419221B1 publication Critical patent/EP1419221B1/en
Anticipated expiration legal-status Critical
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
    • C10K1/00—Purifying combustible gases containing carbon monoxide
    • C10K1/04—Purifying combustible gases containing carbon monoxide by cooling to condense non-gaseous materials
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
    • C10K1/00—Purifying combustible gases containing carbon monoxide
    • C10K1/04—Purifying combustible gases containing carbon monoxide by cooling to condense non-gaseous materials
    • C10K1/06—Purifying combustible gases containing carbon monoxide by cooling to condense non-gaseous materials combined with spraying with water
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
    • C10B43/00—Preventing or removing incrustations
    • C10B43/02—Removing incrustations
    • C10B43/08—Removing incrustations with liquids
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
    • C10B43/00—Preventing or removing incrustations
    • C10B43/14—Preventing incrustations

Definitions

  • the invention relates to a method for flushing norkoolers of a coking plant according to the preamble of claim 1.
  • the raw coke oven gas is first cooled in a direct raw gas cooling with the so-called Norlagen sprinkling water in a template.
  • the raw coke oven gas is cooled to a temperature of approx. 80 ° C and at the same time part of the carried solids part is washed out of the raw coke oven gas and separated in the liquid phase together with the tar and condensate.
  • the coke oven raw gas is cooled in an indirect cooling from approx. 80 ° C to approx. 20 ° C.
  • a large part of the naphthalene contained in the raw coke oven gas sublimes.
  • tar-like, solids-containing ingredients of the coke oven raw gas are separated on the outer walls of the cooling tubes of the precoolers. In conjunction with the sublimed naphthalene, there is a risk that the precooler will become blocked after a relatively short operating time.
  • the condensate separated in the pre-coolers and the naphthalene-containing rinsing tar cannot be conveyed directly to the tar separation at a temperature of approx. 20 ° C, since otherwise the emulsion would form and the tar separation would no longer work.
  • the precooler condensates with the naphthalene-containing flushing tar are therefore usually pumped back to the individual raw gas feeds of the coke oven batteries and mixed there with the hot condensed liquid phase coming from the coke oven.
  • the temperature of the recirculated pre-cooler condensate, including the rinsing tar raised to approx. 80 ° C, but mixing takes place at the same time with the tar coming from the coke oven, so that ultimately only one tar enriched with naphthalene reaches and separates from the tar Rinsing the precooler is available.
  • the unpublished DE 100 51 349 AI discloses a process for the extraction of naphthalene from raw coke oven gas, in which the raw coke oven gas is cooled and the naphthalene contained in the raw coke oven gas is obtained directly.
  • the unpublished DE 100 07 503 AI discloses a process for the treatment of raw coke oven gas, in which the raw coke oven gas after cooling is passed through an electrostatic filter and then into the precooler, the outlet of the electric feeder being used for purging in the precoolers.
  • DE 26 52 499 AI discloses a method for cooling the raw coke oven gas, in which the precooler is divided into two stages, with no precooler purging being carried out in the first stage and sprinkling of the gas with the recycle in the second stage the precooler condensate is made.
  • DE 36 14 851 AI discloses a method for rinsing precoolers of a coking plant, in which the precoolers are rinsed with the liquid phase obtained from the template.
  • lighter components BTX aromatics
  • the invention has for its object to provide a method in which a blockage of the precooler by naphthalene deposits is reliably avoided and thus a high availability of the precooler is guaranteed and in which additional cleaning methods are unnecessary. This object is achieved by the features of patent claim 1.
  • the method according to the invention is based on the basic idea of using the liquid phase obtained in the case of direct raw gas cooling in the raw gas receiver, which contains a relatively low naphthalene tar, for purging the precooler.
  • the liquid phase of at least one raw gas receiver is not mixed with the precooler condensates which contain the flushing tar which has already been enriched with naphthalene and is collected in a separate tar separator.
  • This separately collected liquid phase contains the particularly low naphthalene tar.
  • the existing tar separator can be used as a separate tar separator. This has the advantage that no additional tar separator and thus additional investments are required.
  • this low-naphthalene liquid phase is used for flushing the cooler tubes in the pre-coolers.
  • the water portion of the separately collected liquid phase can be separated in the separate tar separator.
  • the low naphthalene tar can also be mixed with water for use as a flushing tar.
  • the tar or the liquid phase can be freed from the solids in a tar centrifuge. This procedure ensures that no solids get into the precooler through the tar or the liquid phase.
  • the naphthalene of the coke oven raw gas sublimates when it cools from approx. 80 ° C to approx. 20 ° C and is deposited on the cooling pipes of the precooler. It is now possible to prevent the precooler from becoming blocked by continuously flushing it with the low-naphthalene tar with the liquid phase previously obtained from at least one raw gas receiver which is not charged with precooler condensates.
  • Rinsing with low-naphthalene tar can in principle be carried out with all suitable nozzles, preferably in the upper area of the pre-cooler. Since the tar is low in naphthalene, placing the tar in the pre-cooler at one point is sufficient for washing success.
  • the rinsing should take place in three levels, above, in the middle and below. This ensures in any case that deposits do not form on the cooler pipes.
  • Flushing in the pre-coolers with a baffle ring nozzle known per se is preferred.
  • the impact ring nozzles ensure optimal distribution of the low-naphthalene tar on the pipes and the inner walls of the precooler.
  • the tarry and aqueous condensates that run off at the foot of the precooler are conveyed as usual to the remaining raw gas feeds, where they are processed together with the liquid phase that results from direct raw gas cooling.
  • Continuous pre-cooler operation can be maintained by the method according to the invention, since deposits do not form on the cooler tubes and the additional cleaning processes are no longer necessary.
  • the emissions that occur during the additional cleaning processes are also avoided. Flushing with low-naphthalene tar significantly increases the availability of pre-cooling.
  • the investment costs are reduced because fewer pre-coolers have to be provided. Since the cleaning processes can be omitted, the personnel and material costs are also reduced.
  • Continuous pre-cooler operation ensures that constant low coke oven raw gas temperatures are maintained at the pre-cooler outlet.
  • the coke oven gas quality improves because the hydrogen sulfide, ammonia and benzene leaching can be carried out more effectively at a constant low temperature. Corrosion does not occur in the production of benzene, since the condensates containing hydrogen sulfide and ammonia are avoided.
  • Figure 1 is a process diagram of the method for rinsing the precooler with the low naphthalene tar.
  • the treatment of the raw coke oven gas is shown schematically in FIG.
  • the raw coke oven gas coming from the coke ovens 1 is cooled in templates 2 and 2a with the help of sprinkling water 14 directly to approximately 80 ° C. and passed into the precooler 3.
  • the raw coke oven gas is conveyed into a coke oven gas cleaning system 4 before it reaches a consumer 5.
  • the condensates running out of the pre-coolers 3 with the naphthalene-rich flushing tar are required via a line 13 to the template 2, where heating and mixing with the tar obtained in the case of direct raw gas cooling takes place.
  • This liquid phase from the template 2 is fed via a line 9 into a tar separator 6 for separating the tar from the coal water.
  • the coal water is conveyed via line 7 for further processing.
  • the separated naphthalene-rich tar is transported via line 8 for loading.
  • the liquid phase from the template 2a is passed via a line 10 into a separate tar separator 11 and separated into coal water and low-naphthalene tar.
  • the low-naphthalene tar is conveyed via a line 12 to the precoolers 3 and is used there to rinse the cooling pipes.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Combustion & Propulsion (AREA)
  • Materials Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Industrial Gases (AREA)
  • Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Separation By Low-Temperature Treatments (AREA)

Abstract

The invention relates to a method for scavenging the precoolers of a coking plant. The inventive method is characterized by scavenging the precoolers with the liquid phase produced from the collecting main and using a liquid phase from at least one collecting main that is not impinged upon by the condensation products of the precoolers.

Description

Verfahren zur Spülung von Norkühlern einer Kokerei Process for flushing nork coolers in a coking plant
Die Erfindung betrifft ein Verfahren zur Spülung von Norkühlern einer Kokerei gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a method for flushing norkoolers of a coking plant according to the preamble of claim 1.
Das bei der Nerkokung von Steinkohle entstehende braungelbe Gemisch aus Gasen und Dämpfen, das sogenannte Koksofenrohgas, beinhaltet einen nicht unerheblichen Feststoff- und Νaphthalinanteil. Das Koksofenrohgas wird zunächst in einer direkten Rohgaskühlung mit dem sogenannten Norlagenberieselungswasser in einer Vorlage gekühlt. Dabei wird das Koksofenrohgas auf eine Temperatur von ca. 80°C gekühlt und gleichzeitig ein Teil des mitgefuhrten Feststoffanteils aus dem Koksofenrohgas ausgewaschen und in der flüssigen Phase mitsamt dem Teer und Kondensat abgeschieden.The brown-yellow mixture of gases and vapors that arises from the coking of hard coal, the so-called coke oven raw gas, contains a not inconsiderable proportion of solids and Νaphthalene. The raw coke oven gas is first cooled in a direct raw gas cooling with the so-called Norlagen sprinkling water in a template. The raw coke oven gas is cooled to a temperature of approx. 80 ° C and at the same time part of the carried solids part is washed out of the raw coke oven gas and separated in the liquid phase together with the tar and condensate.
Der restliche Feststoffanteil, der in Form von Aerosolen an feinste Teer- und Wassertropfen gebunden ist, gelangt mit dem Koksofenrohgas in die sogenannten Vorkühler. Dort wird das Koksofenrohgas in einer indirekten Kühlung von ca. 80°C auf ca. 20°C gekühlt. Bei dieser Abkühlung sublimiert ein Großteil des in dem Koksofenrohgas enthaltenen Naphthalins. Gleichzeitig werden teerige, feststoffhaltige Inhaltsstoffe des Koksofenrohgases auf den Außenwänden der Kühlrohre der Vorkühler abgeschieden. In Verbindung mit dem sublimierten Naphthalin besteht die Gefahr, dass es nach relativ kurzer Betriebszeit zu Verstopfungen des Vorkühlers kommt. Durch eine permanente Berieselung mit der aus der Vorlage gewonnenen Flüssigphase (Teer- Wasseremulsion - ca. 30 % Teer und ca. 70% Wasser) im oberen und mittleren Teil der Vorkühler sollen die Feststoff- und Naphthalinablagerungen auf den Kühlrohren gelöst werden. Da diese Teer- Wasseremulsion bereits nahezu mit Naphthalin gesättigt ist und außerdem Feststoffe beinhaltet, führt diese permanente Vorkühlerberieselung zu keiner wesentlichen Verfügbarkeitserhöhung bei der Koksofenrohgaskühlung. Aus diesem Grunde ist es üblich, dass die Vorkühler im ständigen Rhythmus, teilweise täglich, mittels Dampf gereinigt werden müssen. Da diese Vorkühler während des Reinigungsvorganges nicht zur Verfügung stehen, müssen zusätzliche Vorkühlerkapazitäten ständig betriebsbereit sein.The remaining solids, which are bound in the form of aerosols to the finest drops of tar and water, reach the so-called precoolers with the raw coke oven gas. There the coke oven raw gas is cooled in an indirect cooling from approx. 80 ° C to approx. 20 ° C. During this cooling, a large part of the naphthalene contained in the raw coke oven gas sublimes. At the same time, tar-like, solids-containing ingredients of the coke oven raw gas are separated on the outer walls of the cooling tubes of the precoolers. In conjunction with the sublimed naphthalene, there is a risk that the precooler will become blocked after a relatively short operating time. Through a permanent Sprinkling with the liquid phase obtained from the template (tar-water emulsion - approx. 30% tar and approx. 70% water) in the upper and middle part of the precooler should remove the solid and naphthalene deposits on the cooling pipes. Since this tar-water emulsion is already almost saturated with naphthalene and also contains solids, this permanent pre-cooler irrigation does not lead to any significant increase in the availability of raw coke oven gas cooling. For this reason, it is common for the precoolers to be cleaned with steam at regular intervals, sometimes daily. Since these pre-coolers are not available during the cleaning process, additional pre-cooler capacities must be constantly ready for operation.
Das in den Vorkühlern abgeschiedene Kondensat sowie der naphthalinhaltige Spülteer kann mit einer Temperatur von ca. 20°C nicht direkt zur Teerscheidung gefördert werden, da es dort sonst zur Emulsionsbildung kommt und die Teerscheidung nicht mehr funktionieren würde. Daher werden die Vorkühlerkondensate mit dem naphthalinhalti- gen Spülteer üblicherweise zu den einzelnen Rohgasvorlagen der Koksofenbatterien zurückgepumpt und dort mit der heißen, aus dem Koksofen kommenden auskondensierten Flüssigphase vermischt. Dabei wird allerdings nicht nur die Temperatur des zurückgeführten Vorkühlerkondensates einschließlich des Spülteers auf ca. 80°C angehoben, sondern es findet gleichzeitig eine Vermischung mit dem aus dem Koksofen kommenden Teer statt, so dass letztlich nur ein mit Naphthalin angereicherter Teer zur Teerscheidung gelangt und zur Spülung der Vorkühler zur Verfügung steht.The condensate separated in the pre-coolers and the naphthalene-containing rinsing tar cannot be conveyed directly to the tar separation at a temperature of approx. 20 ° C, since otherwise the emulsion would form and the tar separation would no longer work. The precooler condensates with the naphthalene-containing flushing tar are therefore usually pumped back to the individual raw gas feeds of the coke oven batteries and mixed there with the hot condensed liquid phase coming from the coke oven. However, not only is the temperature of the recirculated pre-cooler condensate, including the rinsing tar, raised to approx. 80 ° C, but mixing takes place at the same time with the tar coming from the coke oven, so that ultimately only one tar enriched with naphthalene reaches and separates from the tar Rinsing the precooler is available.
Um die geforderten Grenzwerte für den Schwefelwasserstoff- und den Ammoniakgehalt im gereinigten Koksofengas nach der Gaswäsche zu erreichen, ist die konstante Einhaltung von niedrigen Vorkühleraustrittstemperaturen erforderlich. Es muss eine zuverlässige Vorkühlung des Koksofenrohgases kontinuierlich gewährleistet sein und eine Verstopfung der Vorkühler verhindert werden.In order to achieve the required limit values for the hydrogen sulfide and the ammonia content in the cleaned coke oven gas after the gas scrubbing, constant maintenance of low pre-cooler outlet temperatures is necessary. Reliable pre-cooling of the raw coke oven gas must be ensured continuously and the precooler must not be blocked.
Die nicht vorveröffentlichte DE 100 51 349 AI offenbart ein Verfahren zur Gewinnung von Naphthalin aus Koksofenrohgas, bei dem das Koksofenrohgas gekühlt und das in dem Koksofenrohgas enthaltene Naphthalin direkt gewonnen wird. Die nicht vorveröffentlichte DE 100 07 503 AI offenbart ein Verfahren zur Behandlung von Koksofenrohgas, bei dem das Koksofenrohgas nach Kühlung in der Vorlage durch einen Elektrofilter und anschließend in die Vorkühler geführt wird, wobei der Ablauf des Elektrofüters zum Spülen in den Vorkühlern verwendet wird.The unpublished DE 100 51 349 AI discloses a process for the extraction of naphthalene from raw coke oven gas, in which the raw coke oven gas is cooled and the naphthalene contained in the raw coke oven gas is obtained directly. The unpublished DE 100 07 503 AI discloses a process for the treatment of raw coke oven gas, in which the raw coke oven gas after cooling is passed through an electrostatic filter and then into the precooler, the outlet of the electric feeder being used for purging in the precoolers.
Aus der DE 34 23 798 C2 ist es bekannt, dass das Koksofenrohgas nach Kühlung in der Vorlage zunächst durch einen Elektrofilter und anschließend in die Vorkühler geführt wird. Durch das Elektrofilter werden zwar ein Großteil der Feststoffe in dem Koksofenrohgas abgeschieden, die Gefahr von Naphthalinablagerungen auf den Kühlrohren der Vorkühler wird jedoch nicht beseitigt. Auch bei dieser Verfahrensweise muss eine Berieselung mit einem Teer- Wasser-Gemisch zur Ablösung der Ablagerungen vorgenommen werden.From DE 34 23 798 C2 it is known that the raw coke oven gas after cooling in the receiver is first passed through an electrostatic filter and then into the precooler. Although the electrostatic precipitator separates a large part of the solids in the raw coke oven gas, the risk of naphthalene deposits on the cooling tubes of the precoolers is not eliminated. With this procedure, too, sprinkling with a tar-water mixture must be carried out to remove the deposits.
In der DE 26 52 499 AI wird ein Verfahren zur Kühlung des Koksofenrohgases offenbart, bei dem der Vorkühler in zwei Stufen unterteilt ist, wobei in der ersten Stufe keine Vorkühlerspülung vorgenommen wird und in der zweiten Stufe eine Berieselung des Gases mit dem im Kreislauf geführten Ablauf des Vorkühlerkondensates vorgenommen wird.DE 26 52 499 AI discloses a method for cooling the raw coke oven gas, in which the precooler is divided into two stages, with no precooler purging being carried out in the first stage and sprinkling of the gas with the recycle in the second stage the precooler condensate is made.
Die DE 36 14 851 AI offenbart ein Verfahren zur Spülung von Vorkühlern einer Kokerei, bei dem die Vorkühler mit der aus der Vorlage gewonnenen Flüssigphase gespült werden. Zusätzlich wird vorgeschlagen, in das Koksofenrohgas die leichteren Komponenten (BTX-Aromaten) dem Koksofenrohgas zuzuführen, damit in dem Vorkühler eine ausreichende Lösungsmittelmenge für das sublimierte Naphthalin im Vorkühler vorhanden ist.DE 36 14 851 AI discloses a method for rinsing precoolers of a coking plant, in which the precoolers are rinsed with the liquid phase obtained from the template. In addition, it is proposed to supply the lighter components (BTX aromatics) to the coke oven raw gas in the coke oven raw gas so that a sufficient amount of solvent for the sublimed naphthalene is present in the precooler in the precooler.
Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren zur Verfügung zu stellen, bei dem eine Verstopfung der Vorkühler durch Naphthalinablagerungen zuverlässig vermieden wird und somit eine hohe Verfügbarkeit der Vorkühler gewährleistet ist und bei dem sich außerdem zusätzliche Reinigungsverfahren erübrigen. Diese Aufgabe wird durch die Merkmale des Patentanspruchs 1 gelöst.The invention has for its object to provide a method in which a blockage of the precooler by naphthalene deposits is reliably avoided and thus a high availability of the precooler is guaranteed and in which additional cleaning methods are unnecessary. This object is achieved by the features of patent claim 1.
Weiterbildungen erfolgen gemäß den Merkmalen der Unteransprüche.Further developments take place according to the characteristics of the subclaims.
Das erfindungsgemäße Verfahren beruht auf dem Grundgedanken, die bei der direkten Rohgaskühlung in der Rohgasvorlage anfallende Flüssigphase, die einen relativ naphthalinarmen Teer enthält, zur Spülung der Vorkühler zu verwenden.The method according to the invention is based on the basic idea of using the liquid phase obtained in the case of direct raw gas cooling in the raw gas receiver, which contains a relatively low naphthalene tar, for purging the precooler.
Durch Versuche wurde herausgefunden, dass der in der Vorlage durch direkte Kühlung auf eine Temperatur von ca. 80°C abgeschiedene Teer nur einen geringen Anteil (ca. 2 %) an Naphthalin enthält. Dieses Ergebnis war überraschend, da bisher davon ausgegangen wurde, dass aufgrund der guten Löslichkeit des Naphthalins im Teer ein großer Anteil des im Koksofenrohgas enthaltenen Naphthalins mit dem Teer abgeschieden würde. Tatsächlich erfolgt die Anreicherung des Teers in der Vorlage mit Naphthalin durch die oben beschriebene Rückführung der Vorkühlerkondensate.Experiments have shown that the tar separated by direct cooling to a temperature of approx. 80 ° C contains only a small amount (approx. 2%) of naphthalene. This result was surprising, since it was previously assumed that due to the good solubility of the naphthalene in the tar, a large proportion of the naphthalene contained in the coke oven raw gas would be separated off with the tar. In fact, the tar is enriched with naphthalene through the recirculation of the precooler condensates described above.
Demzufolge wird erfindungsgemäß die Flüssigphase mindestens einer Rohgasvorlage nicht mit den Vorkühlerkondensaten, die den bereits mit Naphthalin angereicherten Spülteer enthalten, vermischt und in einem separaten Teerscheider gesammelt. Diese separat gesammelte Flüssigphase enthält den besonders naphthalinarmen Teer. Als separater Teerscheider kann der vorhandene Teerscheider verwendet werden. Das hat den Vorteil, dass kein zusätzlicher Teerscheider und damit zusätzliche Investitionen erforderlich sind. Erfindungsgemäß wird diese naphthalinarme Flüssigphase zur Spülung der Kühlerrohre in den Vorkühlern verwendet.Accordingly, according to the invention, the liquid phase of at least one raw gas receiver is not mixed with the precooler condensates which contain the flushing tar which has already been enriched with naphthalene and is collected in a separate tar separator. This separately collected liquid phase contains the particularly low naphthalene tar. The existing tar separator can be used as a separate tar separator. This has the advantage that no additional tar separator and thus additional investments are required. According to the invention, this low-naphthalene liquid phase is used for flushing the cooler tubes in the pre-coolers.
Der Wasseranteil der gesondert gesammelten Flussigphase kann gemäß einer Weiterbildung in dem separaten Teerscheider abgeschieden werden. Der naphthalinarme Teer kann für die Verwendung als Spülteer auch mit Wasser gemischt sein. Gemäß einer weiteren Ausgestaltung kann der Teer oder die Flüssigphase in einer Teerzentrifuge von den Feststoffen befreit werden. Bei dieser Verfahrensweise ist sichergestellt, dass keine Feststoffe durch den Teer bzw. die Flüssigphase in die Vorkühler gelangen.According to a further development, the water portion of the separately collected liquid phase can be separated in the separate tar separator. The low naphthalene tar can also be mixed with water for use as a flushing tar. According to a further embodiment, the tar or the liquid phase can be freed from the solids in a tar centrifuge. This procedure ensures that no solids get into the precooler through the tar or the liquid phase.
Wie bereits dargestellt, sublimiert das Naphthalin des Koksofenrohgases bei der Abkühlung von ca. 80°C auf ca. 20°C und lagert sich auf den Kühlrohren der Vorkühler ab. Es gelingt nun, ein Verstopfen der Vorkühler dadurch zu verhindern, dass diese kontinuierlich mit dem zuvor aus mindestens einer Rohgasvorlage, die nicht mit Vorkühlerkondensaten beaufschlagt wird, gewonnenen Flüssigphase mit dem naphthalinarmen Teer gespült werden.As already shown, the naphthalene of the coke oven raw gas sublimates when it cools from approx. 80 ° C to approx. 20 ° C and is deposited on the cooling pipes of the precooler. It is now possible to prevent the precooler from becoming blocked by continuously flushing it with the low-naphthalene tar with the liquid phase previously obtained from at least one raw gas receiver which is not charged with precooler condensates.
Das Spülen mit dem naphthalinarmen Teer kann grundsätzlich mit allen dafür geeigneten Düsen, vorzugsweise im oberen Bereich des Vorkühlers, durchgeführt werden. Da der Teer naphthalinarm ist, ist die Aufgabe des Teers in den Vorkühler an nur einer Stelle für den Spülerfolg ausreichend.Rinsing with low-naphthalene tar can in principle be carried out with all suitable nozzles, preferably in the upper area of the pre-cooler. Since the tar is low in naphthalene, placing the tar in the pre-cooler at one point is sufficient for washing success.
Gemäß einer weiteren Ausgestaltung der Erfindung sollte das Spülen in drei Ebenen, oben, in der Mitte und unten erfolgen. Dadurch ist auf jeden Fall sichergestellt, dass Ablagerungen an den Kühlerrohren nicht entstehen.According to a further embodiment of the invention, the rinsing should take place in three levels, above, in the middle and below. This ensures in any case that deposits do not form on the cooler pipes.
Bevorzugt ist das Spülen in den Vorkühlern mit einer an sich bekannten Prallringdüse (DE-PS 197 48 693). Die Prallringdüsen sorgen für eine optimale Verteilung des naphthalinarmen Teeres auf den Rohren und den Innenwandungen der Vorkühler. Die am Fuß der Vorkühler ablaufenden teerigen und wässrigen Kondensate werden wie üblich wieder zu den noch verbleibenden Rohgasvorlagen gefördert, wo sie gemeinsam mit der bei der direkten Rohgaskühlung anfallenden flüssigen Phase verarbeitet werden.Flushing in the pre-coolers with a baffle ring nozzle known per se (DE-PS 197 48 693) is preferred. The impact ring nozzles ensure optimal distribution of the low-naphthalene tar on the pipes and the inner walls of the precooler. The tarry and aqueous condensates that run off at the foot of the precooler are conveyed as usual to the remaining raw gas feeds, where they are processed together with the liquid phase that results from direct raw gas cooling.
Durch das erfindungsgemäße Verfahren kann ein kontinuierlicher Vorkühlerbetrieb aufrechterhalten werden, da Ablagerungen an den Kühlerrohren nicht entstehen und die zusätzlichen Reinigungsvorgänge nicht mehr erforderlich sind. Es werden außerdem die bei den zusätzlichen Reinigungsprozessen (Reinigung mit Dampf) auftretenden Emissi- onen vermieden. Durch die Spülung mit dem naphthalinarmen Teer wird die Verfügbarkeit der Vorkühlung deutlich erhöht. Die Investitionskosten reduzieren sich, da weniger Vorkühler vorgesehen werden müssen. Da die Reinigungsvorgänge wegfallen können, reduzieren sich ebenfalls die Personal- und Materialkosten.Continuous pre-cooler operation can be maintained by the method according to the invention, since deposits do not form on the cooler tubes and the additional cleaning processes are no longer necessary. The emissions that occur during the additional cleaning processes (cleaning with steam) are also avoided. Flushing with low-naphthalene tar significantly increases the availability of pre-cooling. The investment costs are reduced because fewer pre-coolers have to be provided. Since the cleaning processes can be omitted, the personnel and material costs are also reduced.
Durch den kontinuierlichen Vorkühlerbetrieb ist die Einhaltung von konstanten niedrigen Koksofenrohgastemperaturen am Vorkühleraustritt gewährleistet. Es verbessert sich die Koksofengasqualität, da die Schwefelwasserstoff-, Ammoniak- und Benzolauswaschung bei konstant niedriger Temperatur effektiver vorgenommen werden kann. Bei der Benzolgewinnung treten keine Korrosionen auf, da die Schwefelwasserstoff- und ammoniakhaltigen Kondensate vermieden werden.Continuous pre-cooler operation ensures that constant low coke oven raw gas temperatures are maintained at the pre-cooler outlet. The coke oven gas quality improves because the hydrogen sulfide, ammonia and benzene leaching can be carried out more effectively at a constant low temperature. Corrosion does not occur in the production of benzene, since the condensates containing hydrogen sulfide and ammonia are avoided.
Die vorgenannten, sowie die beanspruchten und im Ausführungsbeispiel beschriebenen, erfindungsgemäß zu verwendenden Verfahrensschritte unterliegen hinsichtlich ihrer Verfahrensbedingungen keinen besonderen Ausnahmebedingungen, so dass die in dem jeweiligen Anwendungsgebiet bekaimten Auswahlkriterien im Rahmen der Ansprüche uneingeschränkt Anwendung finden können.The aforementioned process steps, as well as the process steps to be used according to the invention, which are claimed and described in the exemplary embodiment, are not subject to any special exception conditions with regard to their process conditions, so that the selection criteria obtained in the respective field of application can be used without restriction within the scope of the claims.
Weitere Einzelheiten, Merkmale und Vorteile des Gegenstandes der Erfindung ergeben sich aus der nachfolgenden Beschreibung der zugehörigen Zeichnung, in der beispielhaft eine bevorzugte Ausfuhrungsform eines Verfahrens zur Kühlung von Koksofenrohgas dargestellt ist. In der Zeichnung zeigtFurther details, features and advantages of the subject matter of the invention result from the following description of the accompanying drawing, in which a preferred embodiment of a method for cooling raw coke oven gas is shown by way of example. In the drawing shows
Figur 1 ein Verfahrensschema des Verfahrens zur Spülung der Vorkühler mit dem naphthalinarmen Teer.Figure 1 is a process diagram of the method for rinsing the precooler with the low naphthalene tar.
In der Figur 1 ist die Behandlung des Koksofenrohgases schematisch dargestellt. Das aus den Koksöfen 1 kommende Koksofenrohgas wird in Vorlagen 2 und 2a mit Hilfe von Berieselungswasser 14 direkt auf ca. 80°C gekühlt und in die Vorkühler 3 geleitet. Von den Vorkühlern 3 wird das Koksofenrohgas in eine Koksofengasreinigung 4 gefördert, bevor es zu einem Verbraucher 5 gelangt. Die aus den Vorkühlem 3 ablaufenden Kondensate mit dem naphthalinreichen Spülteer werden über eine Leitung 13 zur Vorlage 2 gefordert , wo eine Erwärmung und Vermischung mit dem bei der direkten Rohgaskühlung anfallenden Teer stattfindet. Diese Flüssigphase aus der Vorlage 2 wird über eine Leitung 9 in einen Teerscheider 6 zur Trennung des Teers von dem Kohlewasser geführt. Über eine Leitung 7 wird das Kohlewasser zur weiteren Aufarbeitung gefördert. Der abgeschiedene naphthalinreiche Teer wird über eine Leitung 8 zur Verladung transportiert. Die Flüssigphase aus der Vorlage 2a wird über eine Leitung 10 in einen separaten Teerscheider 11 geleitet und in Kohlewasser und naphthalinarmen Teer getrennt. Der naphthalinarme Teer wird über eine Leitung 12 zu den Vorkühlem 3 gefördert und dort zum Spülen der Kühlrohre verwendet. The treatment of the raw coke oven gas is shown schematically in FIG. The raw coke oven gas coming from the coke ovens 1 is cooled in templates 2 and 2a with the help of sprinkling water 14 directly to approximately 80 ° C. and passed into the precooler 3. From the precoolers 3, the raw coke oven gas is conveyed into a coke oven gas cleaning system 4 before it reaches a consumer 5. The condensates running out of the pre-coolers 3 with the naphthalene-rich flushing tar are required via a line 13 to the template 2, where heating and mixing with the tar obtained in the case of direct raw gas cooling takes place. This liquid phase from the template 2 is fed via a line 9 into a tar separator 6 for separating the tar from the coal water. The coal water is conveyed via line 7 for further processing. The separated naphthalene-rich tar is transported via line 8 for loading. The liquid phase from the template 2a is passed via a line 10 into a separate tar separator 11 and separated into coal water and low-naphthalene tar. The low-naphthalene tar is conveyed via a line 12 to the precoolers 3 and is used there to rinse the cooling pipes.
BezugszeichenlisteLIST OF REFERENCE NUMBERS
1 Koksofen1 coke oven
2 Vorlage2 template
2a Vorlage2a template
3 Vorkühler3 precoolers
4 Koksofengasreinigung4 coke oven gas cleaning
5 Verbraucher5 consumers
6 Teerscheider6 tar separators
7 Leitung (Kohlewasser)7 pipe (coal water)
8 Leitung (Teer)8 pipe (tar)
9 Leitung (Flüssigphase mit naphthalinreichem Teer)9 line (liquid phase with naphthalene-rich tar)
10 Leitung (Flüssigphase mit naphthalinarmem Teer)10 line (liquid phase with low naphthalene tar)
11 separater Teerscheider11 separate tar separators
12 Leitung (naphthalinarmer Spülteer)12 pipe (low naphthalene flushing tar)
13 Leitung (Vorkühlerkondensate mit naphthalinreichem Teer)13 line (precooler condensate with tar rich in naphthalene)
14 Berieselungswasser 14 sprinkling water

Claims

Patentansprüche claims
1. Verfahren zur Spülung von Vorkühlem einer Kokerei, bei dem die Vorkühler mit der aus der Vorlage gewonnenen Flüssigphase gespült werden, dadurch gekennzeichnet, dass eine Flüssigphase aus mindestens einer Vorlage verwendet wird, die nicht mit Vorkühlerkondensaten beaufschlagt wird.1. Method for rinsing precoolers of a coking plant, in which the precoolers are rinsed with the liquid phase obtained from the template, characterized in that a liquid phase from at least one template is used which is not subjected to precooler condensates.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Flüssigphase aus mindestens einer Vorlage, die nicht mit Vorkühlerkondensaten beaufschlagt wird, in einem separaten Teerscheider geleitet und der in dem Teerscheider gewonnene naphthalinarme Teer zum Spülen in den Vorkühlern verwendet wird.2. The method according to claim 1, characterized in that the liquid phase from at least one template, which is not acted upon by pre-cooler condensates, passed in a separate tar separator and the low-naphthalene tar obtained in the tar separator is used for rinsing in the pre-coolers.
3. Verfahren nach Ansprach 1 und 2, dadurch gekennzeichnet, dass der in dem separaten Teerscheider gewonnene naphthalinarme Teer oder die Flüssigphase zum Abscheiden der Feststoffe in eine Teerzentrifuge geleitet wird und danach zum Spülen in den Vorkühlem verwendet wird.3. The method according spoke 1 and 2, characterized in that the low naphthalene tar obtained in the separate tar separator or the liquid phase for separating the solids is passed into a tar centrifuge and then used for rinsing in the precooler.
4. Verfahren nach Anspruch 1 bis 3, dadurch gekennzeichnet, dass das Spülen in den Vorkühlem mittels Prallringdüsen erfolgt.4. The method according to claim 1 to 3, characterized in that the rinsing in the precoolers is carried out by means of impact ring nozzles.
5. Verfahren nach Ansprach 1 bis 4, dadurch gekennzeichnet, dass das Spülen in den Vorkühlem an einer einzigen Aufgabestelle erfolgt.5. The method according spoke 1 to 4, characterized in that the rinsing takes place in the precooler at a single feed point.
6. Verfahren nach Ansprach 1 bis 5, dadurch gekennzeichnet, dass das Spülen in den Vorkühlem oben, mittig und unten vorgenommen wird. 6. The method according spoke 1 to 5, characterized in that the rinsing in the pre-coolers is carried out at the top, middle and bottom.
EP02764842A 2001-08-15 2002-08-10 Method for scavenging precoolers of a coking plant Expired - Lifetime EP1419221B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10139172A DE10139172C1 (en) 2001-08-15 2001-08-15 Rinsing pre-coolers of coking plant involves using liquid phase produced from collecting main which has not been impinged with pre-cooler condensate
DE10139172 2001-08-15
PCT/EP2002/008978 WO2003016437A2 (en) 2001-08-15 2002-08-10 Method for scavenging precoolers of a coking plant

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EP1419221A2 true EP1419221A2 (en) 2004-05-19
EP1419221B1 EP1419221B1 (en) 2006-06-07

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AT (1) ATE328985T1 (en)
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DE (2) DE10139172C1 (en)
TW (1) TW555844B (en)
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CN107413778A (en) * 2017-04-27 2017-12-01 唐山钢铁集团有限责任公司 A kind of cleaning method for reducing coking end cooler resistance
CN107916144B (en) * 2017-12-21 2023-06-16 中冶焦耐(大连)工程技术有限公司 Primary cooler spraying device with backwashing function and application method thereof

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Publication number Priority date Publication date Assignee Title
DE1074815B (en) * 1960-02-04 Fa Carl Still Recklinghausen Process for obtaining carbon materials from coke oven gases
DE2652499A1 (en) * 1976-11-18 1978-05-24 Otto & Co Gmbh Dr C Cooling of coke oven gas - in two stages sepd. by spraying with condensate to remove naphthalene
DE3423798A1 (en) * 1984-06-28 1986-01-09 Bergwerksverband Gmbh, 4300 Essen METHOD FOR SEPARATING THE WATER RESULTING FROM THE COCING PROCESS INTO A SMALL SALT-HIGH AND A LARGE SALT-LOW FRACTION
DE3614851A1 (en) * 1986-05-02 1987-11-05 Still Carl Gmbh Co Kg METHOD FOR COOLING RAW GAS
DE4012141A1 (en) * 1990-04-14 1991-10-17 Still Otto Gmbh METHOD FOR PRE-COOKING RAW COOKING GAS AND FOR DESORPING WASHING WATER AND CONDENSATE OF COOKING
DE10007503B4 (en) * 2000-02-18 2004-05-27 Deutsche Montan Technologie Gmbh Process for the treatment of raw coke oven gas
DE10051349B4 (en) * 2000-10-17 2005-02-03 Deutsche Montan Technologie Gmbh Process and apparatus for recovering naphthalene from raw coke oven gas

Non-Patent Citations (1)

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Title
See references of WO03016437A3 *

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CN1543497A (en) 2004-11-03
ATE328985T1 (en) 2006-06-15
WO2003016437A2 (en) 2003-02-27
ZA200400726B (en) 2004-03-02
AU2002329241A1 (en) 2003-03-03
TW555844B (en) 2003-10-01
DE50207122D1 (en) 2006-07-20
WO2003016437A3 (en) 2003-09-25
KR20040025935A (en) 2004-03-26
DE10139172C1 (en) 2003-02-06
EP1419221B1 (en) 2006-06-07

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