EP0019641A1 - Method of processing carbon-water suspensions, resulting from scrubbing the gas produced during the gasification of crude mineral materials - Google Patents

Method of processing carbon-water suspensions, resulting from scrubbing the gas produced during the gasification of crude mineral materials Download PDF

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Publication number
EP0019641A1
EP0019641A1 EP19790101494 EP79101494A EP0019641A1 EP 0019641 A1 EP0019641 A1 EP 0019641A1 EP 19790101494 EP19790101494 EP 19790101494 EP 79101494 A EP79101494 A EP 79101494A EP 0019641 A1 EP0019641 A1 EP 0019641A1
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EP
European Patent Office
Prior art keywords
water
carbon
mixed
suspension
gasification
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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
EP19790101494
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German (de)
French (fr)
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EP0019641B1 (en
Inventor
Josef Dr. Langhoff
Jürgen Seipenbusch
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Ruhrchemie AG
RAG AG
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Ruhrkohle AG
Ruhrchemie AG
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Priority to DE7979101494T priority Critical patent/DE2966045D1/en
Priority to EP19790101494 priority patent/EP0019641B1/en
Publication of EP0019641A1 publication Critical patent/EP0019641A1/en
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Publication of EP0019641B1 publication Critical patent/EP0019641B1/en
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
    • C10J3/46—Gasification of granular or pulverulent flues in suspension
    • C10J3/48—Apparatus; Plants
    • C10J3/485—Entrained flow gasifiers
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
    • C10J3/72—Other features
    • C10J3/82—Gas withdrawal means
    • C10J3/84—Gas withdrawal means with means for removing dust or tar from the gas
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
    • C10J2300/0913—Carbonaceous raw material
    • C10J2300/093—Coal
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
    • C10J2300/0913—Carbonaceous raw material
    • C10J2300/0946—Waste, e.g. MSW, tires, glass, tar sand, peat, paper, lignite, oil shale
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
    • C10J2300/0953—Gasifying agents
    • C10J2300/0956—Air or oxygen enriched air
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
    • C10J2300/0953—Gasifying agents
    • C10J2300/0973—Water
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
    • C10J2300/0953—Gasifying agents
    • C10J2300/0973—Water
    • C10J2300/0976—Water as steam
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/18—Details of the gasification process, e.g. loops, autothermal operation
    • C10J2300/1807—Recycle loops, e.g. gas, solids, heating medium, water

Definitions

  • the invention relates to a process for the treatment of water / carbon suspensions, which are produced when the gas is washed out, which arises during the gasification of mineral raw materials, by separating the carbon-containing material from the suspension and adding and admixing it to the starting fuel, while the wash water again is passed into the washing zone.
  • Coal dust gasification takes place in the cocurrent of coal with water vapor and oxygen or air in the gasification reactor.
  • the carbon-containing fuels required for this are first finely ground together with water in a wet mill.
  • the finished suspension is then pumped into the reactor, where it is gasified together with the oxygen and possibly water vapor.
  • the reaction takes place very quickly in the flame, so that the average residence time in the reactor is only a few seconds.
  • the end product in this process consists mainly of carbon oxide and hydrogen. It also contains relatively large amounts of entrained carbonaceous solids.
  • the entrained solid particles are then freed from the entrained solids by contacting the synthesis gases with water in conventional washing devices, such as, for example, washing coolers.
  • the solids-laden wash Water is then fed to a thickener, which divides the suspension into solid and wash water, solid being mixed into the feed and the wash being mixed with the feed and the wash water being returned to the wash zone.
  • a thickener which divides the suspension into solid and wash water, solid being mixed into the feed and the wash being mixed with the feed and the wash water being returned to the wash zone.
  • this ash automatically precipitates in the cooling zone through direct contact with the water and can be removed in the form of sintered material from the bottom of the vessel.
  • the invention has set itself the task of developing and proposing a method by means of which the combustible and Incombustible components of the discharged carbon-containing material can be separated as much as possible and without too much effort.
  • the object is achieved in that the carbon-containing material is subjected to a classification together with the wash water before being returned and that only the sieve residue is returned to the gasification reactor and mixed with the feed.
  • Investigations have shown that the proportion of ash increases with increasing grain fineness, so that the ash content of the total suspension can be markedly reduced by simply separating the finer fractions.
  • the ash content can be reduced from approximately 40% to 13% if the carbon-containing material is subjected to wet sieving at 63 ⁇ . Wet screening in such grain areas is only known from coal processing but not from the processing of such water-carbon suspensions. So far, media of this type have not been wet-screened, inter alia, because the relatively high ash content leads to the fear of very high wear of the screen material.
  • the wear is negligible and is expected at waitem due to the advantage of the low ash content of the recycled residue.
  • the sieve passage which contains most of the ash, is then separated from the water and removed from the circuit.
  • the sieve residue which mainly contains carbon-containing components, is continuously drawn off, hydraulically returned to the gasification reactor, and mixed with the feed. Since it is already a water-carbon suspension, prior mixing is not necessary.
  • the suspension can be immediately added to the gasification reactor or else added to the suspension tank.
  • the main advantage of the method according to the invention is that a noticeable reduction in the ash content of the carbon-containing material returned to the process can be achieved with the aid of a classification which is not expensive to use.
  • the process described is neither temperature nor pressure dependent and can therefore also be carried out without additional process engineering effort.
  • the advantage of the method can also be seen in the fact that gasification of ballast-rich carbon-containing minerals is also economically possible by a subsequent spreading of the solid discharged with the synthesis gas. Without such Aufbreitung the content of incombustible at the entrance of the reactor that barely sufficient -brennbare shares in E insatzgut would otherwise quickly extent increase, are present.
  • the process according to the invention is further improved in that the water-carbon suspension is first thickened, then intimately mixed with a liquid hydrocarbon and then classified.
  • a cross-linking of the carbon-containing parts which leads to an agglomeration of the carbon-containing parts, so that during the subsequent classification the slag-rich solid is discharged with the water through the sieve.
  • the surface properties of the carbon-containing minerals used do not change even by gasification or partial gasification.
  • the solid washed out of the gas stream is first concentrated to a concentration suitable for the crosslinking process in order to minimize the consumption of oil and to make the success of the crosslinking process as cheap as possible.
  • the concentration according to the invention is 200 to 500 grams per liter, preferably 350 grams per liter.
  • the thickener underflow is then mixed intensively with 5 to 20 percent by weight, preferably 8 to 10 percent by weight, based on the solids content, with commercially available heating oil EL.
  • the agglomeration that occurs here relates exclusively to the carbon-containing substances, due to the constant surface properties mentioned above.
  • the sieve residue can be mixed in without further pretreatment, because the heating oil still adhering to the solid particles does not hinder the subsequent gasification process, but rather even promotes it. Since this is also a water-carbon suspension, the suspension can also be introduced directly into the gasification reactor.
  • a further improvement is achieved in that a comminution between is switched.
  • the thickener underflow can be ground to less than 0.1 mm.
  • the separation effect of the method according to the invention is improved by more optimal crosslinking.
  • the sieve residue is further dewatered, mixed with a binder and then compacted. Such substances can then e.g. fed to a fixed bed gasifier and gasified there.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

1. Method of processing suspensions of carbonaceous material and water, which are produced by scrubbing the gas obtained in the gasification of coal, in which the suspension is thickened, intimately mixed with a liquid hydrocarbon, the carbonaceous material is separated from the suspension by filtration and returned to, and mixed with, the initial fuel material, while the wash water is again led to the wash zone, characterised in that the suspension is thickened to 200 to 500 g/l, preferably 350 g/l, then mixed with fuel oil as the liquid hydrocarbon, and the mixture is classified over a sieve having a 0.5 mm mesh width, and the classification residue is returned together with accompanying fuel oil as the initial fuel material.

Description

Die Erfindung betrifft ein Verfahren zur Aufbereitung von Wasser/Kohlenstoff-suspensionen, die beim Auswaschen des Gases anfallen, das bei der Vergasung von mineralischen Rohstoffen entsteht, indem das kohlenstoffhaltige Material aus der Suspension abgetrennt und dem Ausgangsbrennstoff zugeführt und beigemischt wird, während das Waschwasser erneut in die Waschzone geleitet wird.The invention relates to a process for the treatment of water / carbon suspensions, which are produced when the gas is washed out, which arises during the gasification of mineral raw materials, by separating the carbon-containing material from the suspension and adding and admixing it to the starting fuel, while the wash water again is passed into the washing zone.

Die Kohlenstaubvergasung erfolgt im Gleichstrom von Kohle mit Wasserdampf und Sauerstoff bzw. Luft im Vergasungsreaktor. Die hierfür benötigten kohlenstoffhaltigen Brennstoffe werden zunächst zusammen mit Wasser in einer Naßmühle fein aufgemahlen. Die fertige Suspension gelangt dann über eine Pumpe in den Reaktor, wo sie zusammen mit dem Sauerstoff und evtl. Wasserdampf vergast wird. Die Reaktion läust in der Flamme sehr schnell ab, so daß die mittlere Verweilzeit im Reaktor nur wenige Sekunden beträgt. Das Endprodukt besteht bei diesem Verfahren in der Hauptsache aus Kohlenoxyd und Wasserstoff. Darüber hinaus enthält es verhältnismäßig große Mengen mitgerissener kohlenstoffhaltiger Feststoffe.Coal dust gasification takes place in the cocurrent of coal with water vapor and oxygen or air in the gasification reactor. The carbon-containing fuels required for this are first finely ground together with water in a wet mill. The finished suspension is then pumped into the reactor, where it is gasified together with the oxygen and possibly water vapor. The reaction takes place very quickly in the flame, so that the average residence time in the reactor is only a few seconds. The end product in this process consists mainly of carbon oxide and hydrogen. It also contains relatively large amounts of entrained carbonaceous solids.

Die mitgerissenen Feststoffteilchen werden danach durch Berührung der Synthesegase mit Wasser in üblichen Wascheinrichtungen, wie z.B. Waschkühlern,von den mitgeführten Feststoffen befreit. Das feststoffbeladene Waschwasser wird dann einem Eindicker zugeführt, der die Suspension in Feststoff und Waschwasser aufteilt, wobei Feststoff dem Einsatzgut zugemischt und das Waschder Feststoff dem Einsatzgut zugemischt und das Waschwasser wieder in die Waschzone zurückgeleitet wird. Durch die Rückführung des Feststoffes kann der Kohlenstoffdurchsatz auf annähernd 100 % gebracht werden.The entrained solid particles are then freed from the entrained solids by contacting the synthesis gases with water in conventional washing devices, such as, for example, washing coolers. The solids-laden wash Water is then fed to a thickener, which divides the suspension into solid and wash water, solid being mixed into the feed and the wash being mixed with the feed and the wash water being returned to the wash zone. By recycling the solid, the carbon throughput can be brought to approximately 100%.

Aus der DT-PS 12 16 259 ist ein Verfahren zur Aufbereitung derartiger Wasser-Kohlenstoff-Suspensionen bekannt, nach dem die Waschwasserdispersion zunächst mit einer Benzinfraktion vermischt wird, wodurch die Kohle auf dem Wasser aufschwimmt und so vom Wasser getrennt werden kann. Eine weitere Entwässerung wird dadurch erreicht, daß die vorhandene Benzinkohlesuspension anschließend mit einem Bunkerheizöl gemischt und danach erhitzt wird. Hierdurch verdampft das Benzin, das anschließend wieder zum Auswaschen Verwendung finden kann, während das Gemisch aus Bunkerheizöl und suspendierter Kohle dem Vergasungsreaktor wieder zugeführt wird.From DT-PS 12 16 259 a process for the preparation of such water-carbon suspensions is known, according to which the wash water dispersion is first mixed with a gasoline fraction, whereby the coal floats on the water and can thus be separated from the water. A further drainage is achieved in that the existing gasoline coal suspension is then mixed with a bunker heating oil and then heated. This vaporizes the gasoline, which can then be used again for washing out, while the mixture of bunker heating oil and suspended coal is fed back to the gasification reactor.

Aus der DT-PS 12 16 259 ist es auch bereits bekannt, wenigstens einen Teil der Asche aus den gasförmigen Reaktionsprodukten zu beseitigen, da hierdurch die Brauchbarkeit und der Wert der später zurückgewonnenen kohlenstoffhaltigen Materialien erhöht werden kann. Diese Asche fällt nach dem beschriebenen Verfahren in der Kühlzone durch unmittelbare Berührung mit dem Wasser automatisch aus und kann in Sintergutform am Boden des Gefäßes abgezogen werden.From DT-PS 12 16 259 it is also known to remove at least part of the ash from the gaseous reaction products, since this can increase the usability and the value of the carbon-containing materials recovered later. According to the method described, this ash automatically precipitates in the cooling zone through direct contact with the water and can be removed in the form of sintered material from the bottom of the vessel.

Es hat sich aber gezeigt, daß die damit verbundene Reduzierung des Mineralstoffanteiles bzw. Ascheanteiles in dem Feststoff nicht ausreicht, um den Wirkungsgrad des Vergasungsverfahrens und damit die Wirtschaftlichkeit wirksam zu erhöhen. Der anfallende Feinstaub bei der Vergasung besteht nach den bisherigen Erfahrungen etwa zur Hälfte aus Brennbarem und aus Asche. Durch die fortlaufende Rückführung des mit dem Synthesegas ausgetragenen Feststoffes wird sich damit der Aschegehalt des Einsatzgutes laufend erhöhen. Um die Pumpbarkeit des Einsatzgutes aufrechtzuerhalten, muß zusätzliches Wasser aufgegeben werden, was zu einer Verschlechterung des Wirkungsgrades führt.However, it has been shown that the associated reduction in the mineral content or ash content in the solid is not sufficient to effectively increase the efficiency of the gasification process and thus the economy. The resulting fine dust during gasification According to previous experience, about half of the combustible and ash consist. As a result of the continuous recirculation of the solid matter discharged with the synthesis gas, the ash content of the feedstock will increase continuously. In order to maintain the pumpability of the feed, additional water must be added, which leads to a deterioration in efficiency.

Unter Berücksichtigung der Erkenntnis, daß der Wirkungsgrad des Vergasungsverfahrens und damit die Wirtschaftlichkeit durch eine Verringerung des Mineralstoffanteiles im ausgetragenen und zurückgeführten Feststoff merklich verbessert werden kann, hat sich die Erfindung die Aufgabe gestellt, ein Verfahren zu entwickeln und vorzuschlagen, mit dessen Hilfe die brennbaren und unbrennbaren Bestandteile des ausgetragenen kohlenstoffhaltigen Materials möglichst weitgehend und ohne zu großen Aufwand voneinander getrennt werden können.Taking into account the knowledge that the efficiency of the gasification process and thus the economy can be significantly improved by reducing the mineral content in the discharged and returned solid, the invention has set itself the task of developing and proposing a method by means of which the combustible and Incombustible components of the discharged carbon-containing material can be separated as much as possible and without too much effort.

Die Aufgabe wird erfindungsgemäß dadurch gelöst, daß das kohlenstoffhaltige Material vor der Rückführung zusammen mit dem Waschwasser einer Klassierung unterzogen und daß nur der Siebrückstand vor den Vergasungsreaktor zurückgeführt und mit dem Einsatzgut gemischt wird. Untersuchungen haben nämlich gezeigt, daß der Ascheanteil mit zunehmender Kornfeinheit steigt, so daß durch einfache Abtrennung der feineren Fraktionen der Aschegehalt der Gesamtsuspension merklich gesenkt werden kann. Nach den vorliegenden Untersuchungen kann der Aschegehalt von etwa 40 % auf 13 % gesenkt werden, wenn das kohlenstoffhaltige Material bei 63µ einer Naßsiebung unterzogen wird. Die Naßsiebung auch in derartigen Kornbereichen ist nur aus der Kohlenaufbereitung nicht aber aus der Aufbereitung derartiger Wasser-Kohlenstoff-Suspensionen bekannt. Bisher sind derartige Medien u.a. deshalb nicht naßgesiebt worden, weil der relativ hohe Aschegehalt einen sehr hohen Verschleiß des Siebmaterials befürchten läßt.The object is achieved in that the carbon-containing material is subjected to a classification together with the wash water before being returned and that only the sieve residue is returned to the gasification reactor and mixed with the feed. Investigations have shown that the proportion of ash increases with increasing grain fineness, so that the ash content of the total suspension can be markedly reduced by simply separating the finer fractions. According to the available investigations, the ash content can be reduced from approximately 40% to 13% if the carbon-containing material is subjected to wet sieving at 63µ. Wet screening in such grain areas is only known from coal processing but not from the processing of such water-carbon suspensions. So far, media of this type have not been wet-screened, inter alia, because the relatively high ash content leads to the fear of very high wear of the screen material.

Wenn die Maschenweite des Siebes so festgelegt wird, daß das Grobgut bei guter Ausbeute einen möglichst niedrigen Aschegehalt aufweist, z.B. bei einer Maschenweite von 63 u, ist der Verschleiß zu vernachlässigen und wird bei waitem durch den Vorteil des niedrigen Aschegehaltes des zurückgeführten reststoffes aufgelegen. Der Siebdurchgang, der den größten Teil an Asche enthält, wird anschließend vom Wasser getrennt und aus dem Kreislauf herausgenommen. Der Siebrückstand, der überwiegend kohlenstoffhaltige Bestandteile aufweist, wird kontinuierlich abgezogen, hydraulisch vor den Vergasungsreaktcr zurückgeführt, und mit dem Einsatzgut gemischt. Da es sich bereits um eine Wasser-Kohlenstoff-Suspension handelt, entfällt eine vorherige Durchmischung. Die Suspension kann sofort dem Vergasungsreaktor mitaufgegeben oder aber dem Suspensionsbehälter aufgegeben werden. Der wesentliche Vorteil des erfindungsgemäßen Verfahrens liegt darin, daß man mit Hilfe einer apparativ wenig aufwendigen Klassierung eine merkbare Senkung des Aschegehaltes des dem Prozeß wieder zugeführten kohlenstoffhaltigen Materials erreichen kann. Der beschriebene Vorgang ist weder temperaturnoch druckabhängig und kann daher auch ohne zusätzlichen verfahrenstechnischen Aufwand durchgeführt werden. Der Vorteil des Verfahrens ist u.a. auch darin zu sehen, daß durch eine nachgeschaltete Aufbreitung des mit dem Synthesegas ausgetragenen Feststoffes auch eine Vergasung von ballastreichen kohlenstoffhaltigen Mineralien wirtschaftlich möglich ist. Ohne eine solche Aufbreitung würde sich der Gehalt an Unverbrennbarem am Eingang des Reaktors ansonsten sehr schnell soweit erhöhen, daß kaum noch ausreichende -brennbare Anteile im Einsatzgut vorhanden sind.If the mesh size of the sieve is determined in such a way that the coarse material has the lowest possible ash content with a good yield, for example with a mesh size of 63 u, the wear is negligible and is expected at waitem due to the advantage of the low ash content of the recycled residue. The sieve passage, which contains most of the ash, is then separated from the water and removed from the circuit. The sieve residue, which mainly contains carbon-containing components, is continuously drawn off, hydraulically returned to the gasification reactor, and mixed with the feed. Since it is already a water-carbon suspension, prior mixing is not necessary. The suspension can be immediately added to the gasification reactor or else added to the suspension tank. The main advantage of the method according to the invention is that a noticeable reduction in the ash content of the carbon-containing material returned to the process can be achieved with the aid of a classification which is not expensive to use. The process described is neither temperature nor pressure dependent and can therefore also be carried out without additional process engineering effort. The advantage of the method can also be seen in the fact that gasification of ballast-rich carbon-containing minerals is also economically possible by a subsequent spreading of the solid discharged with the synthesis gas. Without such Aufbreitung the content of incombustible at the entrance of the reactor that barely sufficient -brennbare shares in E insatzgut would otherwise quickly extent increase, are present.

Das erfindungsgemäße Verfahren wird dadurch weiter verbessert, daß die Wasser-Kohlenstoff-Suspension zunächst eingedickt, danach mit einem flüssigen Kohlenwasserstoff innig vermischt und anschließend klassiert wird. Hierdurch tritt eine Umnetzung der kohlenstoffhaltigen Teile ein, die zu einer Agglomeration der kohlenstoffhaltigen Teile führt, so daß bei der anschließenden Klassierung der schlackenreiche Feststoff mit dem Wasser durch das Sieb hindurch ausgetragen wird. Hierbei hat sich überraschend gezeigt, daß sich die Oberflächeneigenschaften der eingesetzten kohlenstoffhaltigen Mineralien auch durch die Vergasung bzw. Teilvergasung nicht ändern. Der aus dem Gasstrom ausgewaschene Feststoff wird zunächst auf eine für das Umnetzungsverfahre ngeeignete Konzentration eingedickt, um den Verbrauch an Öl möglichst gering und den Erfolg des Umnetzungsverfahrens möglichst günstig zu gestalten. Die Konzentration beträgt erfindungsgemäß 200 bis 500 Gramm pro Liter vorzugsweise 350 Gramm pro Liter. Danach wird der Eindickerunterlauf mit 5 bis 20 Gewichtsprozenten, vorzugsweise 8 bis 10 Gewichtsprozenten bezogen auf den Feststoffgehalt mit handelsüblichem Heizöl EL intensiv gemischt. Die hierbei auftretende Agglomeration betrifft ausschließlich die kohlenstoffhaltigen Substanzen, aufgrund der bereits vorab erwähnten gleichgebliebenen Oberflächeneigenschaften. Hierdurch ist es dann einfach möglich, die Suspensionen aus agglomerierten kohlenstoffhaltigen Teilen, schlackereichem Feststoff und Wasser einem Sieb von z.S. 0,5 mm aufzugeben und den dann erhaltenen Siebrückstand dem Reaktor wieder zuzuführen und mit dem Einsatzgut zu mischen. Der Siebrückstand kann ohne weitere Vorbehandlung zugemischt werden, weil das noch an den Feststoffteilen anhaftende Heizöl den nachfolgenden Vergasungsprozeß nicht behindert, sondern vielmehr sogar fördert. Da es sich auch hierbei um eine Wasser- Kohlenstoff-Suspension handelt, kann die Suspension 'auch unmittelbar in den Vergasungsreaktor eingebracht werden.The process according to the invention is further improved in that the water-carbon suspension is first thickened, then intimately mixed with a liquid hydrocarbon and then classified. Hereby occurs a cross-linking of the carbon-containing parts, which leads to an agglomeration of the carbon-containing parts, so that during the subsequent classification the slag-rich solid is discharged with the water through the sieve. It has surprisingly been found that the surface properties of the carbon-containing minerals used do not change even by gasification or partial gasification. The solid washed out of the gas stream is first concentrated to a concentration suitable for the crosslinking process in order to minimize the consumption of oil and to make the success of the crosslinking process as cheap as possible. The concentration according to the invention is 200 to 500 grams per liter, preferably 350 grams per liter. The thickener underflow is then mixed intensively with 5 to 20 percent by weight, preferably 8 to 10 percent by weight, based on the solids content, with commercially available heating oil EL. The agglomeration that occurs here relates exclusively to the carbon-containing substances, due to the constant surface properties mentioned above. In this way it is then easily possible to feed the suspensions of agglomerated carbon-containing parts, slag-rich solid and water to a sieve of zS 0.5 mm and to feed the sieve residue then obtained back to the reactor and to mix it with the feed. The sieve residue can be mixed in without further pretreatment, because the heating oil still adhering to the solid particles does not hinder the subsequent gasification process, but rather even promotes it. Since this is also a water-carbon suspension, the suspension can also be introduced directly into the gasification reactor.

Eine weitere Verbesserung wird dadurch erreicht, daß in das erfindungsgemäße Verfahren eine Zerkleinerung zwischengeschaltet wird. So kann z.B. der Eindickerunterlauf auf kleiner 0,1 mm aufgemahlen werden. Hierdurch wird der Trenneffekt des erfindungscemäßen Verfahrens durch eine optimalere Umnetzung verbessert.A further improvement is achieved in that a comminution between is switched. For example, the thickener underflow can be ground to less than 0.1 mm. As a result, the separation effect of the method according to the invention is improved by more optimal crosslinking.

Unter gewissen Voraussetzungen kann es zweckmäßig sein, auf eine Rückführung der mit dem Synthesegas ausgetragenen Kohlenstoffteilchen zu verzichten. Dies wird insbesondere dann der Fall sein, wenn eine andere wirtschaftliche Verwertungsmöglichkeit für diese Anteile besteht. So wird erfindungsgemäß vorgeschlagen, daß der Siebrückstand weiter entwässert, mit einem Bindemittel gemischt und dann kompaktiert wird. Derartige Stoffe können dann z.B. einem Festbettvergaser zugeführt und dort vergast werden.Under certain conditions, it may be advisable not to recycle the carbon particles discharged with the synthesis gas. This will be the case in particular if there is another economic exploitation option for these shares. It is proposed according to the invention that the sieve residue is further dewatered, mixed with a binder and then compacted. Such substances can then e.g. fed to a fixed bed gasifier and gasified there.

Claims (8)

1. Verfahren zur Aufbereitung von Wasser-Kohlenstoff-Suspensionen, die beim Auswaschen des Gases anfallen, das bei der Vergasung von mineralischen Rohstoffen entsteht, indem das kohlenstoffhaltige Material aus der Suspension abgetrennt und dem Ausgangsbrennstoff zugeführt und beigemischt wird, während das Waschwasser erneut in die Waschzone geleitet wird, dadurch gekennzeichnet , daß das kohlenstoffhaltige Material vor der Rückführung zusammen mit dem Waschwasser einer Klassierung unterzogen und daß nur der Siebrückstand vor den Vergasungsreaktor zurückgeführt und mit dem Einsatzgut gemischt wird.1.Process for the treatment of water-carbon suspensions, which are produced when the gas is scrubbed, which arises from the gasification of mineral raw materials, by separating the carbonaceous material from the suspension and adding and admixing it to the starting fuel, while the wash water is re-introduced into the Washing zone is passed, characterized in that the carbon-containing material is subjected to a classification together with the washing water before the return and that only the sieve residue is returned to the gasification reactor and mixed with the feed. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet , daß der Feinstkornbereich des kohlenstoffhaltigen Materials vorzugsweise der Kornbereich von 0 - 63µ nach der Naßklassierung abgetrennt wird.2. The method according to claim 1, characterized in that the fine grain area of the carbonaceous material, preferably the grain area of 0 - 63µ is separated after the wet classification. 3. Verfahren nach Anspruch 1 , dadurch gekennzeichnet , daß die Wasser-/Kohlenstoff-Suspension eingedickt, danach mit einem flüssigen KohlenWasserstoff innig vermischt und schließlich klassiert wird.3. The method according to claim 1, characterized in that the water / carbon suspension is thickened, then mixed intimately with a liquid hydrocarbon and finally classified. 4. Verfahren nach Anspruch 1 und 3, dadurch gekennzeichnet , daß das kohlenstoffhaltige Material auf 200 bis 500 Gramm pro Liter, vorzugsweise 350 Gramm pro Liter eingedickt wird.4. The method according to claim 1 and 3, characterized in that the carbonaceous material is thickened to 200 to 500 grams per liter, preferably 350 grams per liter. 5. Verfahren nach Anspruch 1, Anspruch 3 und Anspruch 4, dadurch gekennzeichnet , daß der Eindickerunterlauf auf 5 bis 20 Gewichtsprozente, vorzugsweise 8 bis 10 Gewichtsprozente bezogen auf den Feststoffgehalt mit handelsüblichem Heizöl EL intensiv gemischt wird.5. The method according to claim 1, claim 3 and claim 4, characterized in that the thickener underflow to 5 to 20 percent by weight, preferably 8 to 10 percent by weight based on the solids content is mixed intensively with commercial heating oil EL. 6. Verfahren nach Anspruch 3 bis Anspruch 5, dadurch gekennzeichnet , daß die Suspension aus Wasser, kohlenstoffhaltigem Material und Öl bei 0,5 mm klassiert wird.6. The method according to claim 3 to claim 5, characterized in that the suspension of water, carbon-containing material and oil is classified at 0.5 mm. 7. Verfahren nach Anspruch 2 bis Anspruch 6, dadurch gekennzeichnet , daß der Eindickerunterlauf weiter aufgemahlen wird, z.B. auf kleiner 0,1 mm.7. The method according to claim 2 to claim 6, characterized in that the thickener underflow is further ground, e.g. to less than 0.1 mm. 8. Verfahren nach Anspruch 1 und einem der nachfolgenden Ansprüche, dadurch gekennzeichnet , daß der Siebrückstand weiter entwässert, mit einem Bindemittel gemischt und dann kompaktiert wird.8. The method according to claim 1 and one of the following claims, characterized in that the screen residue is further dewatered, mixed with a binder and then compacted.
EP19790101494 1979-05-16 1979-05-16 Method of processing carbon-water suspensions, resulting from scrubbing the gas produced during the gasification of crude mineral materials Expired EP0019641B1 (en)

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Publication number Priority date Publication date Assignee Title
WO1982001888A1 (en) * 1980-12-03 1982-06-10 Can Co American Pyrolysis process and system utilizing pyrolytic oil recycle
EP0063682A2 (en) * 1981-04-27 1982-11-03 Hüls Aktiengesellschaft Process for the production of synthesis gas by partial oxidation of slag-rich feed material
US4419185A (en) * 1981-07-16 1983-12-06 American Carbons, Inc. Pyrolysis system with hot gas recirculation
US4465556A (en) * 1981-07-16 1984-08-14 American Carbons, Inc. Pyrolysis system with hot gas recirculation
RU2723864C1 (en) * 2019-08-12 2020-06-17 Федеральное государственное бюджетное образовательное учреждение высшего образования "Кубанский государственный технологический университет" (ФГБОУ ВО "КубГТУ") Biomass processing method

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US3979188A (en) * 1974-10-25 1976-09-07 Foster Wheeler Energy Corporation Partial oxidation carbon removal process
FR2343803A1 (en) * 1976-03-08 1977-10-07 Shell Int Research PROCESS FOR THE PREPARATION OF CARBON PARTICLES WITHOUT WATER

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DE1496384A1 (en) * 1965-12-31 1969-05-14 Projektierungs Konstruktions U Procedure for the containment and removal of the dust from the raw gas and the condensates during pressure gasification
US3979188A (en) * 1974-10-25 1976-09-07 Foster Wheeler Energy Corporation Partial oxidation carbon removal process
FR2295116A1 (en) * 1974-12-18 1976-07-16 Texaco Development Corp PROCESS FOR THE CONTINUOUS PRODUCTION OF A CLEAN COMBUSTIBLE GAS WITH HIGH CALORIFIC CAPACITY
FR2343803A1 (en) * 1976-03-08 1977-10-07 Shell Int Research PROCESS FOR THE PREPARATION OF CARBON PARTICLES WITHOUT WATER

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1982001888A1 (en) * 1980-12-03 1982-06-10 Can Co American Pyrolysis process and system utilizing pyrolytic oil recycle
EP0063682A2 (en) * 1981-04-27 1982-11-03 Hüls Aktiengesellschaft Process for the production of synthesis gas by partial oxidation of slag-rich feed material
EP0063682A3 (en) * 1981-04-27 1983-04-06 Chemische Werke Huls Ag Process for the production of synthesis gas by partial oxidation of slag-rich feed material
US4419185A (en) * 1981-07-16 1983-12-06 American Carbons, Inc. Pyrolysis system with hot gas recirculation
US4465556A (en) * 1981-07-16 1984-08-14 American Carbons, Inc. Pyrolysis system with hot gas recirculation
RU2723864C1 (en) * 2019-08-12 2020-06-17 Федеральное государственное бюджетное образовательное учреждение высшего образования "Кубанский государственный технологический университет" (ФГБОУ ВО "КубГТУ") Biomass processing method

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