EP0571722A2 - Process and plant layout for drying and burning waste materials - Google Patents

Process and plant layout for drying and burning waste materials Download PDF

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Publication number
EP0571722A2
EP0571722A2 EP93103730A EP93103730A EP0571722A2 EP 0571722 A2 EP0571722 A2 EP 0571722A2 EP 93103730 A EP93103730 A EP 93103730A EP 93103730 A EP93103730 A EP 93103730A EP 0571722 A2 EP0571722 A2 EP 0571722A2
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EP
European Patent Office
Prior art keywords
waste materials
rotary tube
drying
circuit according
line
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Granted
Application number
EP93103730A
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German (de)
French (fr)
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EP0571722A3 (en
EP0571722B1 (en
Inventor
Bernd Dr. Rer. Nat. Dahm
Jürgen Frölich
Eckart Dipl.-Ing. Neubert
Reinhard Dr.-Ing. Assmus
Klaus-Dieter Dipl.-Ing. Schmeer
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HUMBOLDT WEDAG ZAB GmbH
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Zementanlagen- und Maschinenbau Dessau GmbH
DESSAU ZEMENT MASCHBAU GmbH
HUMBOLDT WEDAG ZAB GmbH
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Publication of EP0571722A3 publication Critical patent/EP0571722A3/en
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Publication of EP0571722B1 publication Critical patent/EP0571722B1/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23GCREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/44Details; Accessories
    • F23G5/46Recuperation of heat
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23GCREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/02Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment
    • F23G5/04Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment drying
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23GCREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G7/00Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
    • F23G7/001Incinerators or other apparatus for consuming industrial waste, e.g. chemicals for sludges or waste products from water treatment installations
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23GCREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G2202/00Combustion
    • F23G2202/40Combustion in a pulsed combustion chamber

Definitions

  • the invention relates to a method and the associated technical circuit for drying and burning waste materials, in particular sewage sludge, the waste materials being burned after mechanical and thermal drainage
  • Landfilling will be more difficult for the future for two reasons. Firstly, the creation of sufficient landfill space is becoming increasingly problematic and secondly, the deposition of organic substances is being increasingly restricted after the introduction of TA municipal waste.
  • the disadvantage here is that sometimes long travel distances are required for the sewage sludge to be able to use it in a cement plant.
  • the Hg and Cl contents of the sewage sludge determine the application limits for the addition of the sewage sludge as a secondary fuel in the cement production process.
  • the object of the invention is to provide a method and the associated technical circuit for drying and incineration of waste materials, in particular of sludge, with which complete combustion of the organic pollutants and odors is achieved economically and without additional pollution of the environment with a high availability of the plant.
  • waste materials in particular sewage sludge
  • mechanical dewatering and thermal drying are ground by hot circulating air and then pulsedly burned in a pulsation reactor, the waste materials simultaneously serving as part of the fuel requirement for the pulsating combustion.
  • thermally dried waste with a grain size ⁇ 1mm is returned to the process after mechanical dewatering in order to process it there with the dewatered nasal sludge to form a homogeneous, free-flowing material.
  • the circulating air for the thermal drying of the free-flowing material is heated by indirect heat exchange with the exhaust gases of the pulsating combustion and fed to a rotary tube dryer.
  • the technical circuit for drying and burning waste materials consists of a rotary tube dryer for the thermal drying of the material, which has already been mechanically dewatered and made free-flowing a processing plant and a coarse separator, a filter and a condenser are connected downstream.
  • the processing plant consists of a grinding plant known per se for grinding the thermally dried waste materials.
  • a portion of the thermally dried waste with a grain size ⁇ 1 mm is separated off by means of a sieving machine or a sifter and fed via a material line to the double-shaft mixer upstream of the rotary tube dryer as a return material.
  • the thermally dried waste material which is ground in a ball mill or spring roller mill, is fed into the downstream pulsation reactor for combustion via an intermediate silo.
  • the hot exhaust gases which are generated in the waste combustion in the pulsation reactor, are fed via a line to a recuperator, into which the recirculating air line from the condenser also flows.
  • the circulating air from the condenser which is indirectly heated in the recuperator, is fed back into the rotary tube dryer via a pipeline.
  • the advantage of the solution according to the invention is that the simple and robust construction of a drying system with an indirectly heated rotary tube dryer achieves high availability and economy of the system.
  • the system engineering Circuit achieved a continuous operation without continuous operation of the system.
  • the economy of the process and the system is also achieved by the fact that the sensible heat of the hot exhaust gases generated during the combustion of the waste materials can be used by indirect heat exchange with the circulating air of the dryer circuit.
  • some or all of the fuel required for the combustion of the waste materials is supplied by the waste materials themselves, so that the waste materials are also burned economically.
  • Another advantage of the invention is the ventilation separation of the dryer circuit from the heating circuit for the combustion of the waste materials.
  • the vapors loaded with water vapor are separated in a coarse separator 10 and a filter 11 from the thermally dried material entrained in the circulating air.
  • the cleaned broths are cooled in a downstream condenser 12. They give up the majority of their water load.
  • the draining condensate is returned to the sewage treatment plant.
  • the material separated in the coarse separator 10 is fed via a material line to the material coming from the rotary tube dryer 8.
  • the thermally dried sewage sludge is separated into one or more grain fractions in a screening machine 9 connected downstream of the rotary tube dryer on the material side.
  • the screened grain fraction ⁇ 1 mm is fed to the twin-shaft mixer 7 together with the material separated in the filter 11 as a return material.
  • the coarser fraction> 1 mm obtained in the screening machine 9 is fed to a storage silo 1.
  • the processed material is fed via an intermediate silo 3 for combustion to a pulsation reactor 4, the dried sewage sludge simultaneously replacing part of the fuel required for drying.
  • the organic pollutants and odors are completely combusted in the pulsation reactor 4.
  • the ash is removed from the system and the hot flue gases are fed to a recuperator 5.
  • the hot flue gas emits its sensible heat by indirect heat exchange to the dryer air coming from the condenser 12.
  • the heated dryer air is again the rotary tube dryer 8 and the cooled flue gases from the pulsating combustion are fed to an exhaust gas cleaning system 6.
  • FIG. 2 shows a variant of the circuit according to the invention for drying and burning the sludge.
  • the main difference compared to variant 1 is that the grinding of the thermally dried Klaerschlammes takes place in a spring roller mill 13 instead of the agitator ball mill 2.
  • the sludge thermally dried in the rotary tube dryer 8 is fed in via a material line of a spring roller mill 13 for grinding.
  • the ground sludge sludge passes into a circulating air classifier 15 via a bucket elevator 14, the semolina separated in the circulating air classifier 15 being fed to a conveyor 16.
  • a quantity of partial material is fed back into the twin-shaft mixer 7 as return material, while the other part of the spring roller mill 13 is fed again.
  • the material separated in the coarse separator 10 and in the filter 11 reaches the bucket elevator 14 and / or the intermediate silo 3 downstream of the air classifier 15 via a common material line.
  • the processed material from the intermediate silo 3, as described in variant 1, is fed to a pulsation reactor 4 for combustion, the hot flue gases of the pulsation reactor 4 also being used for indirect heat exchange with the circulating air from the dryer.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Processing Of Solid Wastes (AREA)
  • Treatment Of Sludge (AREA)
  • Fertilizers (AREA)

Abstract

The invention relates to a process and the associated plant layout for drying and burning waste materials, in particular sewage sludge, the waste materials being burned after mechanical and thermal dewatering and drying. According to the invention, this takes place by the thermally dried waste materials being milled and then burned in a pulsating manner in a reactor and by a part of the thermally dried waste materials with a gran size of < 1 mm being delivered back to the process as return material after the mechanical dewatering, and by the heat energy of the waste gases of the pulsating combustion being used as drying energy by indirect heat exchange. <IMAGE>

Description

Die Erfindung betrifft ein Verfahren und die dazugehoehrige anlagentechnische Schaltung zur Trocknung und Verbrennung von Abfallstoffen, insbesondere von Klaerschlamm, wobei die Abfallstoffe nach mechanischer und thermischer Entwaesserung verbrannt werdenThe invention relates to a method and the associated technical circuit for drying and burning waste materials, in particular sewage sludge, the waste materials being burned after mechanical and thermal drainage

Durch die staendig steigenden Anforderungen an die Abwasserreinigung erhoeht sich die Menge an Klaerschlamm. Im Jahre 2000 ist von ca. 3,3 Mill. Tonnen Trockensubstanz auszugehen, die entsorgt bzw. verwertet werden muessen.Due to the constantly increasing demands on wastewater treatment, the amount of sewage sludge increases. In 2000, approx. 3.3 million tons of dry matter can be assumed, which must be disposed of or recycled.

Eine Deponierung wird fuer die Zukunft auf zwei Gruenden schwieriger. Erstens wird die Schaffung von genuegend Deponieraum immer problematischer und zweitens wird die Ablagerung organischer Substanzen nach Einfuehrung der TA Siedlungsabfall immer mehr eingeschraenkt.Landfilling will be more difficult for the future for two reasons. Firstly, the creation of sufficient landfill space is becoming increasingly problematic and secondly, the deposition of organic substances is being increasingly restricted after the introduction of TA municipal waste.

Die Akzeptanz fuer eine landwirtschaftliche Nutzung ist auf Grund der Schadstoffgehalte kaum gegeben. Fuer diese Art der Verwertung kommen somit nur wenig belastete Klaerschlaemme in Frage. Somit bietet sich als einzige Alternative die thermische Verwertung an.Due to the pollutant content, there is hardly any acceptance for agricultural use. For this type of recycling, only lightly strained claw clips come into question. Thermal recycling is therefore the only alternative.

Zur thermischen Verwertung von Klaerschlaemmen sind eine Vielzahl von Verfahren entwickelt worden bei denen die Klaerschlaemme nach einer Trocknung verbrannt werden. Die dabei entstandene Abwaerme wird teilweise zur Gewinnung von Nutzenergie und teilweise zur Trocknung des Klaerschlammes verwendet.A large number of processes have been developed for the thermal utilization of claw sludge in which the claw slurry is burned after drying. The resulting waste heat is partly used to extract Usable energy and partially used to dry the sludge.

Diese Verfahren haben den Nachteil, dasz der Verbrennung des getrockneten Schlammes eine aufwendige Rauchgaswaesche nachgeschaltet werden musz. Ferner entstehen bei der Schlammtrocknung geruchsbelaestigende Brueden, deren Geruchstoffe kostenaufwendig beseitigt werden muessen.These methods have the disadvantage that the combustion of the dried sludge must be followed by a complex flue gas scrubber. In addition, the sludge drying produces odor-polluting vapors, the odor substances of which must be removed in a costly manner.

Zur Beseitigung dieser Nachteile ist es gemaesz der DE 35 42 004 bekannt, Schlaemme aus Klaeranlagen beim Zementherstellungsprozesz thermisch zu verwerten. Dabei werden die Schlaemme mit einem Teil der bei der Zementklinkerkuehlung anfallenden heiszen Abluft getrocknet und danach dem Zementklinkerherstellungsprozesz als Sekundaerbrennstoff zugefuehrt. Durch die hohen Betriebstemperaturen ist eine sichere Entsorgungsmoeglichkeit der Klaerschlaemme gegeben. Die in den Klaerschlammen enthaltenen Schadstoffe werden immobil im erzeugten Zementklinker eingebunden.To eliminate these disadvantages, it is known according to DE 35 42 004 to thermally utilize sludge from sewage treatment plants during the cement production process. The sludge is dried with part of the hot exhaust air from the cement clinker cooling and then fed to the cement clinker manufacturing process as a secondary fuel. Due to the high operating temperatures, the safe disposal of the sewing clamp is possible. The pollutants contained in the sludge are immobilized in the cement clinker.

Nachteilig dabei ist, das fuer die Klaerschlaemme teilweise lange Anfahrtswege benoetigt werden um sie in einem Zementwerk verwerten zu koennen. Ausszerdem werden durch die Hg- und Cl- Gehalte des Klaerschlammes die Einsatzgrenzen fuer die Zugabe des Klaerschlammes als Sekundaerbrennstoff beim Zementherstellungsprozesz bestimmt.The disadvantage here is that sometimes long travel distances are required for the sewage sludge to be able to use it in a cement plant. In addition, the Hg and Cl contents of the sewage sludge determine the application limits for the addition of the sewage sludge as a secondary fuel in the cement production process.

Die Aufgabe der Erfindung besteht darin, ein Verfahren und die dazugehoehrige anlagentechnische Schaltung zur Trocknung und Verbrennung von Abfallstoffen, insbesondere von Klaerschlamm, zu entwickeln, mit dem wirtschaftlich und ohne zusaetzliche Belastung der Umwelt eine vollstaendige Verbrennung der organischen Schad- und Geruchstoffe bei einer hohen Verfuegbarkeit der Anlage erreicht wird.The object of the invention is to provide a method and the associated technical circuit for drying and incineration of waste materials, in particular of sludge, with which complete combustion of the organic pollutants and odors is achieved economically and without additional pollution of the environment with a high availability of the plant.

Erfindungsgemaesz wird das dadurch erreicht, das die Abfallstoffe, insbesondere Klaerschlamm, nach mechanischer Entwaesserung und thermischer Trocknung durch heisze Umluft aufgemahlen und danach in einem Pulsationsreaktor pulsierend verbrannt werden, wobei die Abfallstoffe gleichzeitig als ein Teil des Brennstoffbedarfs fuer die pulsierende Verbrennung dienen.This is achieved according to the invention in that the waste materials, in particular sewage sludge, after mechanical dewatering and thermal drying are ground by hot circulating air and then pulsedly burned in a pulsation reactor, the waste materials simultaneously serving as part of the fuel requirement for the pulsating combustion.

Ein Teil der thermisch getrockneten Abfallstoffe mit einer Korngroesze < 1mm wird als Rueckfuehrgut dem Prozesz nach der mechanischen Entwaesserung wieder aufgegeben, um sie dort mit dem entwaesserten Naszschlamm zu einem homogenen rieselfaehigen Gut zu verarbeiten.Some of the thermally dried waste with a grain size <1mm is returned to the process after mechanical dewatering in order to process it there with the dewatered nasal sludge to form a homogeneous, free-flowing material.

Die Umluft zur thermischen Trocknung des rieselfaehigen Gutes wird durch indirekten Waermetausch mit den Abgasen der pulsierenden Verbrennung aufgeheizt und einem Drehrohrtrockner zugefuehrt.The circulating air for the thermal drying of the free-flowing material is heated by indirect heat exchange with the exhaust gases of the pulsating combustion and fed to a rotary tube dryer.

Die anlagentechnische Schaltung zur Trocknung und Verbrennung von Abfallstoffen besteht aus einem Drehrohrtrockner zur thermischen Trocknung des bereits vorher mechanisch entwaesserten und rieselfaehig gemachten Gutes, dem materialseitig eine Aufbereitungsanlage und gasseitig ein Grobabscheider, ein Filter und ein Kondensator nachgeschaltet sind.The technical circuit for drying and burning waste materials consists of a rotary tube dryer for the thermal drying of the material, which has already been mechanically dewatered and made free-flowing a processing plant and a coarse separator, a filter and a condenser are connected downstream.

Die Aufbereitungsanlage besteht aus einer an sich bekannten Mahlanlage zur Aufmahlung der thermisch getrockneten Abfallstoffe. Ein Teil dar thermisch getrockneten Abfallstoffe mit einer Korngroesze < 1 mm wird mittels einer Siebmaschine oder einem Sichter abgeschieden und ueber eine Materialleitung dem materialseitig dem Drehrohrtrockner vorgeschalteten Doppelwellenmischer als Rueckfuehrgut zugefuehrt. Der in einer Ruehrwerkskugelmuehle oder Federrollenmuehle aufgemahlene thermisch getrocknete Abfallstoff wird ueber ein Zwischensilo dem nachgeschalteten Pulsationsreaktor zur Verbrennung aufgegeben.The processing plant consists of a grinding plant known per se for grinding the thermally dried waste materials. A portion of the thermally dried waste with a grain size <1 mm is separated off by means of a sieving machine or a sifter and fed via a material line to the double-shaft mixer upstream of the rotary tube dryer as a return material. The thermally dried waste material, which is ground in a ball mill or spring roller mill, is fed into the downstream pulsation reactor for combustion via an intermediate silo.

Die heiszen Abgase, die bei der Abfallverbrennung im Pulsationsreaktor entstehen, werden ueber eine Leitung einem Rekuperator zugefuehrt, in den ebenfalls die Umluftleitung von dem Kondensator muendet. Die im Rekuperator indirekt aufgeheizte Umluft von dem Kondensator wird ueber eine Rohrleitung dein Drehrohrtrockner wieder zugefuehrt Die Abgase des Pulsationsreaktors werden nach verlassen des Rekuperators einer Abgasreinigung aufgegeben.The hot exhaust gases, which are generated in the waste combustion in the pulsation reactor, are fed via a line to a recuperator, into which the recirculating air line from the condenser also flows. The circulating air from the condenser, which is indirectly heated in the recuperator, is fed back into the rotary tube dryer via a pipeline.

Der Vorteil der erfindungsgemaeszen Loesung besteht darin, dasz durch den einfachen und robusten Aufbaueiner Trocknungsanlage mit indirekt beheiztem Drehrohrtrockner eine hohe Verfuegbarkeit und Wirtschaftlichkeit der Anlage erreicher wird. Auszerdem wird durch die anlagentechnische Schaltung ein durchgehender Betrieb ohne dauernde Bedienung der Anlage erzielt. Die Wirtschaftlichkeit des Verfahrens und der Anlage wird auch dadurch erreicht, dasz die fuehlbare Waerme der bei der Verbrennung der Abfallstoffe entstehenden heiszen Abgase durch indirekten Waermetausch mit der Umluft des Trocknerkreislaufes genutzt werden kann. Auszerdem wird der fuer die Verbrennung der Abfallstoffe benoetigte Brennstoff teilweise oder gaenzlich durch die Abfallstoffe selbst geliefert, so dasz auch eine wirtschaftliche Verbrennung der Abfallstoffe erfolgt.The advantage of the solution according to the invention is that the simple and robust construction of a drying system with an indirectly heated rotary tube dryer achieves high availability and economy of the system. In addition, the system engineering Circuit achieved a continuous operation without continuous operation of the system. The economy of the process and the system is also achieved by the fact that the sensible heat of the hot exhaust gases generated during the combustion of the waste materials can be used by indirect heat exchange with the circulating air of the dryer circuit. In addition, some or all of the fuel required for the combustion of the waste materials is supplied by the waste materials themselves, so that the waste materials are also burned economically.

Durch die hohen Temperaturen im Pulsationsreaktor erfolgt eine vollstaendige Verbrennung der organischen Schad- und Geruchsstoffe mit einem geringen Ascheanfall, der dann probemlos deponiert werden kann. Schwermetalle werden immobil in der Asche eingelagert.Due to the high temperatures in the pulsation reactor, there is complete combustion of the organic pollutants and odors with a small amount of ash, which can then be deposited without any problems. Heavy metals are immobilized in the ashes.

Ein weiterer Vorteil der Erfindung besteht in der lufttechnischen Trennung des Trocknerkreislaufes von dem Heizkreislauf zur Verbrennung der Abfallstoffe.Another advantage of the invention is the ventilation separation of the dryer circuit from the heating circuit for the combustion of the waste materials.

Die Erfindung wird anhand von Ausfuehrungsbeispielen naeher erlaeutert. Die dazugehoerige Zeichnungen zeigen:

Fig. 1:
die erfindungsgemaesze anlagentechnische Schaltung zur Trocknung und Verbrennung von Abfallstoffen
Fig. 2:
eine Variante der erfindungsgemaeszen Schaltung zur Trocknung und Verbrennung von Abfallstoffen
   Gemaesz Figur 1 wird der zu verwertende Klaerschlamm in einer nichtdargestellten bekannten Entwaesserungseinrichtung mechanisch entwaessert. In einem Doppelwellenmischer 7 wird der mechanisch entwaesserte Naszschlamm mit bereits thermisch getrocknetem Klaerschlamm, der eine Korngroesze < 1mm besitzt, zu einem homogenen rieselfaehigen Gut vermischt. Dieser rieselfaehige Klaerschlamm wird zur thermischen Trocknung einem speziell fuer Klaerschlamm modifizierten Drehrohrtrockner 8 aufgegeben, in dem er durch heisze Umluft konvektiv getrocknet wird.The invention is explained in more detail using exemplary embodiments. The associated drawings show:
Fig. 1:
the technical system circuit for drying and burning waste materials
Fig. 2:
a variant of the circuit according to the invention for drying and burning waste materials
According to Figure 1, the sewage sludge to be recycled in a known drainage device, not shown, mechanically drained. In a double-shaft mixer 7, the mechanically dewatered nasal sludge is mixed with already thermally dried clarified sludge, which has a grain size <1 mm, to form a homogeneous, free-flowing material. This free-flowing sludge is fed to a rotary tube dryer 8 specially modified for sludge for thermal drying, in which it is convectively dried by hot circulating air.

Die mit Wasserdampf beladenen Brueden werden in einem Grobabscheider 10 und einem Filter 11 von dem mit der Umluft mitgerissenen thermisch getrocknetem Material getrennt. Die gereinigten Brueden werden in einem nachgeschalteten Kondensator 12 abgekuehlt. Dabei geben sie den Groszteil ihrer Wasserbeladung ab. Das abflieszende Kondensat wird zurueck in die Klaeranlage gefuehrt.The vapors loaded with water vapor are separated in a coarse separator 10 and a filter 11 from the thermally dried material entrained in the circulating air. The cleaned broths are cooled in a downstream condenser 12. They give up the majority of their water load. The draining condensate is returned to the sewage treatment plant.

Das im Grobabscheider 10 abgeschiedene Material wird ueber eine Materialleitung dem aus dem Drehrohrtrockner 8 kommenden Material zugefuehrt. In einer dem Drehrohrtrockner materialseitig nachgeschalteten Siebmaschine 9 erfolgt eine Trennung des thermisch getrockneten Klaerschlammes in eine oder mehrere Kornfraktionen. Die abgesiebte Kornfraktion < 1mm wird zusammen mit dem im Filter 11 abgeschiedenen Material als Rueckfuehrgut dem Doppelwellenmischer 7 aufgegeben.The material separated in the coarse separator 10 is fed via a material line to the material coming from the rotary tube dryer 8. The thermally dried sewage sludge is separated into one or more grain fractions in a screening machine 9 connected downstream of the rotary tube dryer on the material side. The screened grain fraction <1 mm is fed to the twin-shaft mixer 7 together with the material separated in the filter 11 as a return material.

Die in der Siebmaschine 9 anfallende groebere Fraktion >1mm wird einem Vorratssilo 1 zugefuehrt. Nach Aufmahlung des thermisch getrockneten Klaerschlammes mit einer Korngroesze ≧ 1mm in einer Ruehrwerkskugelmuehle 2 wird das aufbereitete Material ueber ein Zwischensilo 3 zur Verbrennung einem Pulsationsreaktor 4 aufgegeben, wobei der getrocknete Klaerschlamm gleichzeitig einen Teil des fuer die Trocknung benoetigten Brennstoffes ersetzt. Infolge der hohen Temperaturen erfolgt eine vollstaendige Verbrennung der organischen Schad- und Geruchsstoffe im Pulsationsreaktor 4.The coarser fraction> 1 mm obtained in the screening machine 9 is fed to a storage silo 1. After grinding the thermally dried sewage sludge with a grain size ≧ 1mm in a agitator ball mill 2, the processed material is fed via an intermediate silo 3 for combustion to a pulsation reactor 4, the dried sewage sludge simultaneously replacing part of the fuel required for drying. As a result of the high temperatures, the organic pollutants and odors are completely combusted in the pulsation reactor 4.

Als Verbrennungsluft fuer die pulsierende Verbrennung wird dem Pulsationsreaktor 4 Frischluft und der Teil der vom Kondensator 12 abgefuehrten Trocknerluft zugefuehrt, der nicht unmittelbar zur Trocknung benoetigt wird.Fresh air and the part of the dryer air discharged from the condenser 12, which is not directly required for drying, is supplied to the pulsation reactor 4 as combustion air for the pulsating combustion.

Nach der Verbrennung des Klaerschlammes wird die anfallende Asche aus dem System ausgetragen und die heiszen Rauchgase einem Rekuperator 5 zugefuehrt. Im Rekuperator 4 gibt das heisze Rauchgas seine fuehlbare Waerme durch indirekten Waermetausch an die von dem Kondensator 12 kommende Trocknerluft ab. Die aufgeheizte Trocknerumluft wird wieder dem Drehrohrtrockner 8 und die abgekuehlten Rauchgase von der pulsierenden Verbrennung werden einer Abgasreinigung 6 zugefuehrt.After the combustion of the sludge, the ash is removed from the system and the hot flue gases are fed to a recuperator 5. In the recuperator 4, the hot flue gas emits its sensible heat by indirect heat exchange to the dryer air coming from the condenser 12. The heated dryer air is again the rotary tube dryer 8 and the cooled flue gases from the pulsating combustion are fed to an exhaust gas cleaning system 6.

Die Figur 2 zeigt eine Variante der erfindungsgemaeszen Schaltung zur Trocknung und Verbrennung des Klaerschlammes. Der wesentliche Unterschied gegenueber der Variante 1 besteht darin, dasz die Aufmahlung des thermisch getrockneten Klaerschlammes in einer Federrollenmuehle 13 an Stelle der Ruehrwerkskugelmuehle 2 erfolgt. Dabei wird der im Drehrohrtrockner 8 thermisch getrocknete Klaerschlamm ueber eine Materialleitung einer Federrollenmuehle 13 zur Aufmahlung aufgegeben. Ueber ein Becherwerk 14 gelangt der aufgemahlene Klaerschlamm in einen Umluftsichter 15, wobei die im Umluftsichter 15 abgeschiedenen Griesze einem Foerderer 16 zugefuehrt werden. Dabei wird eine Teilmaterialmenge als Rueckfuehrgut dem Doppelwellenmischer 7 aufgegeben waehrend der andere Teil der Federrollenmuehle 13 wieder zugefuehrt wird.FIG. 2 shows a variant of the circuit according to the invention for drying and burning the sludge. The main difference compared to variant 1 is that the grinding of the thermally dried Klaerschlammes takes place in a spring roller mill 13 instead of the agitator ball mill 2. The sludge thermally dried in the rotary tube dryer 8 is fed in via a material line of a spring roller mill 13 for grinding. The ground sludge sludge passes into a circulating air classifier 15 via a bucket elevator 14, the semolina separated in the circulating air classifier 15 being fed to a conveyor 16. A quantity of partial material is fed back into the twin-shaft mixer 7 as return material, while the other part of the spring roller mill 13 is fed again.

Das im Grobabscheider 10 und im Filter 11 abgeschiedene Material gelangt ueber eine gemeinsame Materialleitung in das Becherwerk 14 und/oder in das dem Umluftsichter 15 nachgeschaltete Zwischensilo 3.The material separated in the coarse separator 10 and in the filter 11 reaches the bucket elevator 14 and / or the intermediate silo 3 downstream of the air classifier 15 via a common material line.

Das aufbereitete Material aus dem Zwischensilo 3 wird, wie in Variante 1 beschrieben, zur Verbrennung einem Pulsationsreaktor 4 aufgegeben, wobei ebenfalls die heiszen Rauchgase des Pulsationsreaktors 4 zum indirekten Waermetausch mit der Trocknerumluft genutzt werden.The processed material from the intermediate silo 3, as described in variant 1, is fed to a pulsation reactor 4 for combustion, the hot flue gases of the pulsation reactor 4 also being used for indirect heat exchange with the circulating air from the dryer.

Aufstellung der verwendeten BezugszeichenList of the reference numerals used

1.1.
VorratssiloStorage silo
2.2nd
RuehrwerkskugelmuehleAgitator ball mill
3.3rd
ZwischensiloIntermediate silo
4.4th
PulsationsreaktorPulsation reactor
5.5.
RekuperatorRecuperator
6.6.
AbgasreinigungExhaust gas cleaning
7.7.
DoppelwellenmischerDouble shaft mixer
8.8th.
DrehrohrtrocknerRotary tube dryer
9.9.
SiebmaschineScreening machine
10.10th
GrobabscheiderCoarse separator
11.11.
Filterfilter
12.12.
Kondensatorcapacitor
13.13.
FederrollenmuehleSpring roller mill
14.14.
BecherwerkBucket elevator
15.15.
UmluftsichterCirculating air classifier
16.16.
FoerdererConveyor

Claims (11)

Verfahren zur Trocknung und Verbrennung von Abfallstoffen, insbesondere Klaerschlamm, wobei die Abfallstoffe nach mechanischer und thermischer Entwaesserung verbrannt werden, gekennzeichnet dadurch, dasz die thermisch getrockneten Abfallstoffe aufgemahlen und danach in einem Reaktor pulsierend verbrannt werden, und dasz ein Teil der thermisch getrockneten Abfallstoffe mit einer Korngroesze < 1mm als Rueckfuehrgut dem Prozesz nach der mechanischen Entwaesserung wieder aufgegeben wird.Process for drying and incinerating waste materials, in particular sewage sludge, the waste materials being burned after mechanical and thermal dewatering, characterized in that the thermally dried waste materials are ground up and then pulsed in a reactor and that part of the thermally dried waste materials is mixed with a Grain size <1mm is returned to the process after mechanical drainage. Verfahren nach Anspruch 1, gekennzeichnet dadurch, dasz die Waermeenergie der Abgase der pulsierenden Verbrennung durch indirekten Waermetausch als Trocknungsenergie verwendet wird.A method according to claim 1, characterized in that the heat energy of the exhaust gases of the pulsating combustion by indirect heat exchange is used as drying energy. Anlagentechnische Schaltung zur Trocknung und Verbrennung von Abfallstoffen, insbesondere von Klaerschlamm, unter Verwendung von mechanischen Entwaesserungseinrichtungen, thermischen Trocknungseirichtungen, wie Drehrohrtrockner, und einer Verbrennungseinrichtung, gekennzeichnet dadurch, dasz dem Drehrohrtrockner (8) materialseitig eine an sich bekannte Mahlanlage, ein Zwischensilo (3) und ein Pulsationsreaktor (4) und gasseitig ein Grobabscheider (10), ein Filter (11) und ein Kondensator (12) nachgeschaltet sind, und dasz die Abgasleitung des Pulsationsreaktors (4) und die Umlufleitung der Bruedenkondensation (12) in einen Rekuperator (5) muenden, in dem das Trocknergas von dem Kondensator (12) durch indirekten Waermetausch aufgeheizt und ueber eine zwischen Rekuperator (5) und Drehrohrtrockner (8) angeordnete Rohrleitung dem Drehrohrtrockner (8) zugefuehrt wird.System-technical circuit for drying and burning waste materials, in particular sewage sludge, using mechanical drainage devices, thermal drying devices, such as rotary tube dryers, and a combustion device, characterized in that the rotary tube dryer (8) has a known grinding system on the material side, an intermediate silo (3) and a pulsation reactor (4) and a coarse separator (10), a filter (11) and a condenser (12) are connected downstream on the gas side, and that the exhaust gas line of the pulsation reactor (4) and the recirculation line of the vapor condensation (12) into a recuperator (5 ) in which the Dryer gas from the condenser (12) is heated by indirect heat exchange and is fed to the rotary tube dryer (8) via a pipe arranged between the recuperator (5) and the rotary tube dryer (8). Anlagentechnische Schaltung nach Anspruch 3, gekennzeichnet dadurch, dasz eine Teilabgasleitung von dem Kondesator (12) in die Verbrennungsluftzufuehrungsleitung des Pulsationsreaktors (4) muendet.System-technical circuit according to claim 3, characterized in that a partial exhaust line from the condenser (12) opens into the combustion air supply line of the pulsation reactor (4). Anlagentechische Schaltung nach Anspruch 3 und 4, gekennzeichnet dadurch, das die dem Drehrohrtrockner (8) nachgeschaltete Mahlanlage aus einer Siebmaschine (9) mit nachgeschaltetem Vorratssilo (1) und Ruehrwerkskugelmuehle (2) besteht..Technical system circuit according to claims 3 and 4, characterized in that the grinding system downstream of the rotary tube dryer (8) consists of a screening machine (9) with a downstream storage silo (1) and agitator ball mill (2). Anlagentechnische Schaltung nach Anspruch 3 bis 5, gekennzeichnet dadurch, dasz die Siebmaschine (9) zur Abfuehrung der Abfallstoffe ≧ 1 mm ueber eine Materialleitung mit dem Vorratssilo (1) verbunden ist.System-technical circuit according to Claims 3 to 5, characterized in that the screening machine (9) for removing the waste materials ≧ 1 mm is connected to the storage silo (1) via a material line. Anlagentechnische Schaltung nach Anspruch 3, bis 6, gekennzeichnet dadurch, dasz die Materialleitung des Filters (11) und die Materialleitung der Siebmaschine (9), in der die Kornfraktion < 1mm abgefuehrt wird, gemeinsam in dem materialseitig vor dem Drehrohrtrockner (8) angeordneten Doppelwellenmischer (7) muenden.System-technical circuit according to claims 3 to 6, characterized in that the material line of the filter (11) and the material line of the screening machine (9), in which the grain fraction <1 mm is discharged, together in the double-shaft mixer arranged on the material side in front of the rotary tube dryer (8) (7) must. Anlagentechnische Schaltung nach Anspruch 3 bis 7, gekennzeichnet dadurch, dasz die Materialleitung des Grobabscheiders (10) in die zwischen Drehrohrtrockner (8) und Siebmaschine (9) angeordnete Materialleitung muendet.System-technical circuit according to Claims 3 to 7, characterized in that the material line of the coarse separator (10) opens into the material line arranged between the rotary tube dryer (8) and the screening machine (9). Anlagentechnische Schaltung nach Anspruch 3 und 4, gekennzeichnet dadurch, dasz die dem Drehrohrtrockner (8) nachgeschaltete Mahlanlage aus einer Federrollenmuehle (13) mit nachgeschaltetem Sichtaggregat, beispielsweise Becherwerk (14) und Umluftsichter (15), besteht.System-technical circuit according to Claims 3 and 4, characterized in that the grinding system connected downstream of the rotary tube dryer (8) consists of a spring roller mill (13) with a downstream viewing unit, for example bucket elevator (14) and air classifier (15). Anlagentechnische Schaltung nach Anspruch 3, 4 und 9, gekennzeichnet dadurch, dasz die Materialleitungen des Grobabscheiders (10) und des Filters (11) in eine gemeinsame Materialleitung die in das Becherwerk (14) und/oder in das Zwischensilo (3) muendet.System-technical circuit according to claim 3, 4 and 9, characterized in that the material lines of the coarse separator (10) and the filter (11) lead into a common material line which ends in the bucket elevator (14) and / or in the intermediate silo (3). Anlagentechnische Schaltung nach Anspruch 3, 4, 9, und 10, gekennzeichnet dadurch, dasz die Grieszleitung des Umluftsichters (15) mit einem Foerderer (16) verbunden ist, und das eine Materialleitung des Foerderers (16), in der ein Teil der Abfallstoffe mit einer Kornfraktion < 1 mm abgefuehrt wird, mit dem Doppelwellenmischer (7) verbunden ist.System-technical circuit according to claim 3, 4, 9 and 10, characterized in that the flow line of the air classifier (15) is connected to a conveyor (16), and the material line of the conveyor (16), in which a part of the waste materials a grain fraction <1 mm is removed, is connected to the twin-shaft mixer (7).
EP93103730A 1992-05-29 1993-03-09 Process and plant layout for drying and burning waste materials Expired - Lifetime EP0571722B1 (en)

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DE4217729 1992-05-29
DE4217729A DE4217729A1 (en) 1992-05-29 1992-05-29 Process and technical circuit for drying and burning waste materials

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1035274C2 (en) * 2008-04-09 2009-10-12 Internationaal Projectbureau H Organic material containing sludge i.e. undiluted and relatively wet sewage sludge, processing method for wastewater treatment plant, involves drying sludge by using pulsating combustor, where portion of dried sludge is used as fuel
CN105399304A (en) * 2015-12-25 2016-03-16 柳建国 Biological sludge drying and incineration cycle-treatment method and complete equipment
WO2021018838A1 (en) * 2019-07-31 2021-02-04 5-Haven Holding GmbH Method and device for utilising organic waste materials

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0692679A3 (en) 1994-07-13 1997-01-02 Kloeckner Humboldt Deutz Ag Method and plant layout for drying and incinerating sewage sludge
DE4431564A1 (en) * 1994-07-13 1996-01-18 Kloeckner Humboldt Deutz Ag Process and technical circuit for drying and burning sewage sludge
DE102009010118B4 (en) * 2009-02-24 2011-03-31 Michael Kaden Process for the automatic incineration of sewage sludge
CN102633420A (en) * 2012-05-09 2012-08-15 江苏中容环保有限公司 Sludge pyrolysis device with functions of porous medium heat accumulating, material equalizing, pre-heating and drying
CN110242968A (en) * 2019-06-21 2019-09-17 南通欣源污泥处置科技有限公司 It is a kind of burning and fume treatment dewatered sludge blanking device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2148447A (en) * 1933-08-26 1939-02-28 William A Dundas Method of and apparatus for disposing of sewage waste
GB2052708A (en) * 1979-05-28 1981-01-28 Escher Wyss Ltd Treating wet materials
US4926764A (en) * 1989-08-17 1990-05-22 Den Broek Jos Van Sewage sludge treatment system

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1207896B (en) * 1961-05-17 1965-12-23 Kohlenscheidungs Ges Mit Besch Process for incinerating thickened sewage sludge and drying and incineration systems for this
SU361983A1 (en) * 1970-06-02 1972-12-13 METHOD OF BURNING DRAIN SEDIMENTATION
CH540858A (en) * 1972-07-31 1973-08-31 Von Roll Ag Process for drying and subsequent incineration of sludge and installation for carrying out the process
US3954069A (en) * 1975-03-10 1976-05-04 Myrens Verksted A/S Process and apparatus for the incineration of aqueous sewage sludge
DE3429055A1 (en) * 1984-08-07 1986-02-20 Heiner Dipl.-Ing. 4030 Ratingen Kreyenberg Process for the disposal of sludges, in particular sewage sludges and septic sludges
DE3542004A1 (en) * 1985-11-28 1987-06-04 Kloeckner Humboldt Deutz Ag Drying and combustion of sludges in the firing of mineral materials
DE3839861A1 (en) * 1988-11-25 1990-05-31 Rudi Pedersen HEATING SYSTEM
DE3915082C1 (en) * 1989-05-09 1990-09-27 Deutsche Babcock Anlagen Ag, 4200 Oberhausen, De

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2148447A (en) * 1933-08-26 1939-02-28 William A Dundas Method of and apparatus for disposing of sewage waste
GB2052708A (en) * 1979-05-28 1981-01-28 Escher Wyss Ltd Treating wet materials
US4926764A (en) * 1989-08-17 1990-05-22 Den Broek Jos Van Sewage sludge treatment system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1035274C2 (en) * 2008-04-09 2009-10-12 Internationaal Projectbureau H Organic material containing sludge i.e. undiluted and relatively wet sewage sludge, processing method for wastewater treatment plant, involves drying sludge by using pulsating combustor, where portion of dried sludge is used as fuel
CN105399304A (en) * 2015-12-25 2016-03-16 柳建国 Biological sludge drying and incineration cycle-treatment method and complete equipment
CN105399304B (en) * 2015-12-25 2017-12-01 柳建国 Biological sludge drying and incineration circulation process method and its complete set of equipments
WO2021018838A1 (en) * 2019-07-31 2021-02-04 5-Haven Holding GmbH Method and device for utilising organic waste materials

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DE59302568D1 (en) 1996-06-20
DE4217729A1 (en) 1993-12-02
EP0571722A3 (en) 1994-02-23
EP0571722B1 (en) 1996-05-15
ATE138177T1 (en) 1996-06-15

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