WO1987002349A1 - Appareil de chauffage de la boue introduite dans un reacteur de bio-gaz - Google Patents

Appareil de chauffage de la boue introduite dans un reacteur de bio-gaz Download PDF

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Publication number
WO1987002349A1
WO1987002349A1 PCT/FI1986/000114 FI8600114W WO8702349A1 WO 1987002349 A1 WO1987002349 A1 WO 1987002349A1 FI 8600114 W FI8600114 W FI 8600114W WO 8702349 A1 WO8702349 A1 WO 8702349A1
Authority
WO
WIPO (PCT)
Prior art keywords
sludge
tank volume
biogas reactor
space
sadd
Prior art date
Application number
PCT/FI1986/000114
Other languages
English (en)
Inventor
Santeri Muhonen
Original Assignee
Oy Dn-Bioprocessing Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Oy Dn-Bioprocessing Ltd filed Critical Oy Dn-Bioprocessing Ltd
Publication of WO1987002349A1 publication Critical patent/WO1987002349A1/fr

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/18—Treatment of sludge; Devices therefor by thermal conditioning
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/28—Anaerobic digestion processes
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
    • C12M21/00—Bioreactors or fermenters specially adapted for specific uses
    • C12M21/04—Bioreactors or fermenters specially adapted for specific uses for producing gas, e.g. biogas
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
    • C12M45/00—Means for pre-treatment of biological substances
    • C12M45/20—Heating; Cooling
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E50/00—Technologies for the production of fuel of non-fossil origin
    • Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel

Definitions

  • the present invention concerns a heater for the input sludge to a biogas reactor, comprising a tank volume, an input connector for conducting sludge into said tank volume, an air input connector for conducting air into an aerator placed in said tank volume, a sludge removal connector for conducting sludge from said tank volume to the biogas reactor, and a gas removal connector for removing the gases that are generated in the tank volume.
  • the greatest energy-consuming item in biogas production is heating the material that is fed in, to the process temperature. This, and the heat losses of the reactor, have the effect that during the coldest periods the entire energy content of the biogas may be used up to satisfy the reactor's own energy requirements.
  • the sludge is often supplied into the reactor through a heavy-sludge tank where it has time to cool to a temperature considerably below the putrifying temperature, which is in the mescphilic range the same temperature which the dung had on leaving the animal.
  • the cooling of the sludge taking place in the heavy-sludge tank may be reduced by efficient thermal lagging of said tank, but the whole problem is not eliminated thereby.
  • the sludge is efficiently aerated before its introduction into the biogas reactor, its temperature begins to increase as a result of microbial activity, and owing to the mixing effect produced by the aerator it is also mixed to be homogeneous.
  • the sludge temperature is allowed to increase suitably over the temperature in the biogas reactor, it becomes possible with the extra thermal energy which it contains to make up the thermal losses of the reactor through its jacket.
  • aerctoic pretreatment of fairly thick sludges also improves the gas yield.
  • the object of the invention is to achieve an improvement of presently known designs.
  • the otter objects of the invention, and the advantages which are gained with its aid, will be apparent from the disclosure.
  • the aims of the invention are achieved with a heater for the biogas reactor input sludges which is mainly characterized in that substantially in the central region of the tank volume has been provided an ascending space along which the sludge that has been introduced in the tank volume has been arranged to move upwards, the sludge flowing upwards in said ascending space being disposed to stay in this ascending space through a long enough delay period so that the oxygen present in the sludge will be substantially used up, and that the substantially oxygen-free sludge has been disposed to flow fr ⁇ n said ascending space in overflow by a descending space downwards to the sludge removal connector.
  • the biogas reactor input sludge heater of the invention may be applied to agricultural and fur animal farming sludges, to sludges produced in connection with effluent treatment, e.g. to sludges generated in forest industry, foodstuff industry .and municipal sewage, and to other equivalent sludges.
  • the heater of the invention enables the sludge to be supplied from an aerobic tank volume to the anaerobic biogas reactor in such manner that the most uniform possible gas generation is obtained.
  • This characteristic is due to the circumstance that in the design of the invention the oxygen content of the sludge that is being fed into the biogas reactor is as low as possible.
  • the solid matter in the sludge can be transferred with greatest possible efficiency and urdformity into the biogas reactor.
  • the access to the biogas reactor of foam that is produced in the aerobic tank volume is efficiently prevented.
  • the sludge is carried at the highest possible temperature to the sludge removal connector, without need to use any lagging which would add to the costs, etc.
  • Fig. 1 presents in elevational view an advantageous embodiment of the biogas reactor input sludge heater of the invention.
  • Fig.2 presents the heater of Fig. 1 in top view.
  • Fig.3 presents another advantageous embodiment of the biogas reactor input sludge heater of the invention, in elevati ⁇ nal view.
  • the biogas reactor input sludge heater of the invention in general has been indicated with reference numeral 10.
  • the heater comprises a tank space 11, into which sludge is connected through, the input connector 12. Air has been arranged to flow through the air input connector 13 to the aerator 14 placed in the tank volume 11.
  • the sludge is aerated in the tank volume 11 with an aerator of the kind which sets the sludge in rotary motion in the substantially cylindrical tank volume 11, as has been indicated with arrows A in Fig.2.
  • an aerator 14 may be used e.g. a submerged aerator provided with ejector.
  • the sludge removal connector 18 connects to the biogas reactor 21.
  • the tank volume 11 is moreover provided with a gas removal connector 20 for conducting the gases generated in the tank volume 11, out from the tank volume 11.
  • the sludge has been arranged to be delayed in the ascending space 16 for a long enough delay period so that the oxygen present in the sludge will be substantially used up as the sludge flows upwards in the ascending space 16.
  • the substantially oxygen-free sludge has been arranged to go in an overflew along the descending space 17 downward to the sludge removal connector 18.
  • the substantially oxygen-free sludge overflew has been indicated with arrows B and the downward flow in the descending space 17, with arrows E.
  • the substantially oxygen-free sludge flows dewnwards in the descending space 17, the residual oxygen is used up, as a result of which the sludge flowing in the sludge removal connector 18 usually contains no oxygen at all.
  • the ascending space 16 of the invention, the overflew D and the descending space 17 have been formed by means of a structure which has been generally indicated with the reference numeral 15 in Fig. 1.
  • the structure 15 consists in this embodiment of an outer tube 22 with substantially cylindrical surface, inside which has been disposed an inner tube 24.
  • the ascending space 16 is then defined by the annular interspace between the outer tube 22 and the inner tube 24.
  • the descending space 17 is constituted by the inner tube 24.
  • peripheral flow apertures 23 through which the sludge in rotary motion A in the tank space 11 has been arranged to flow into the ascending space 16.
  • the upper part 19 of the structure 15 prevents connection from the tank volume 11 to the ascending space 16, whereby the sludge, and such foam as may have formed, cannot flew in the tank volume 11 by the top route to the ascending space 16.
  • the upper part of the structure 15 is a conical tapering section, from which a substantially straight upper end 19a has been carried through the top surface of the tank volume 11, thereby at the same time establishing the gas removal connector 20.
  • a separate gas removal connector 20a may equally be used.
  • FIG. 3 The embodiment depicted in Fig. 3 is otherwise the same as that of Figs 1 and 2, except that in the embodiment of Fig. 3 the structure, generally indicated with reference numeral 15a, has been carried at the top with a bearing 25, and an electric motor 26 has been disposed with the aid of a belt transmission 27 to rotate the structure 15a..
  • no peripheral apertures 23 are required in the outer tube 22 because the outer tube 22 hangs at a distance frcm the bottom of the tank volume 11, whereby the sludge will flew through the gap between the outer tube 22 and the bottom of the tank volume 11.
  • a lifting helix 28 has been disposed to lift the sludge upwards in the ascending space 16.
  • the outer tube 22 may be provided on its outer surface with blades 29, thus enabling also an aerator 14 of such type to be used which creates no rotary motion, which was indicated with arrows A, because the rotating structure 15a and the blades 29 create an equivalent rotary motion of the sludge. If required, the outer tube 22 may in its upper portion be provided with blades 30 which remove the foam from the sludge surface. In this embodiment a separate gas removal connector 20a is used. With the alternative embodiment of Fig. 3 one will positively achieve the ascent even of heavy sludge because the lifting helix 28 is able to lift reliably even heavier sludge.

Abstract

L'appareil de chauffage (10) comprend un volume de cuve (11), un connecteur d'entrée (12) permettant d'acheminer la boue dans ledit volume de cuve (11), un connecteur d'entrée d'air (13) permettant d'acheminer l'air vers un aérateur (14) placé dans ledit volume de cuve (11), un connecteur (18) d'extraction de boue permettant d'acheminer la boue du volume de cuve (11) au réacteur de bio-gaz (21), et un connecteur (20) d'extraction de gaz permettant d'extraire les gaz produits dans le volume de cuve (11). Sensiblement dans la région centrale du volume de cuve (11), il a été ménagé un espace (16) ascendant le long duquel la boue introduite dans le volume de cuve (11) peut se déplacer vers le haut. La boue montant dans ledit espace ascendant (16) reste dans l'espace ascendant (16) pendant une durée suffisante pour que l'oxygène présent dans la boue soit pratiquement consommé. La boue pratiquement dépourvue d'oxygène s'écoule depuis l'espace ascendant (16) dans un trop plein D en suivant un espace descendant (17) jusqu'au connecteur (18) d'extraction de boue.
PCT/FI1986/000114 1985-10-10 1986-10-10 Appareil de chauffage de la boue introduite dans un reacteur de bio-gaz WO1987002349A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI853954 1985-10-10
FI853954A FI72956C (fi) 1985-10-10 1985-10-10 Vaermeapparat foer matningssuspensionen i en biogasreaktor.

Publications (1)

Publication Number Publication Date
WO1987002349A1 true WO1987002349A1 (fr) 1987-04-23

Family

ID=8521491

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1986/000114 WO1987002349A1 (fr) 1985-10-10 1986-10-10 Appareil de chauffage de la boue introduite dans un reacteur de bio-gaz

Country Status (2)

Country Link
FI (1) FI72956C (fr)
WO (1) WO1987002349A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI93002C (fi) * 1992-03-17 1996-01-03 Outokumpu Ecoenergy Oy Menetelmä ja laite anaerobiseen bioreaktoriin syötettävän seoksen valmistamiseksi

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI55165B (fi) * 1975-03-14 1979-02-28 Veli Reijonen Foerfarande foer soenderdelning av organiskt avfall
DE2904449A1 (de) * 1978-02-06 1979-08-09 Ver Gebruikers Stoomketels Anlage zum anaeroben reinigen von abwasser
FI57579B (fi) * 1978-11-22 1980-05-30 Yleinen Oy Anlaeggning foer foerruttnelseprocess av avfallsvattensslam
DE3327541A1 (de) * 1983-07-30 1985-02-14 Wilhelm 4284 Heiden Wissusek Verfahren und vorrichtung zur gewinnung von biogas

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI55165B (fi) * 1975-03-14 1979-02-28 Veli Reijonen Foerfarande foer soenderdelning av organiskt avfall
DE2904449A1 (de) * 1978-02-06 1979-08-09 Ver Gebruikers Stoomketels Anlage zum anaeroben reinigen von abwasser
FI57579B (fi) * 1978-11-22 1980-05-30 Yleinen Oy Anlaeggning foer foerruttnelseprocess av avfallsvattensslam
DE3327541A1 (de) * 1983-07-30 1985-02-14 Wilhelm 4284 Heiden Wissusek Verfahren und vorrichtung zur gewinnung von biogas

Also Published As

Publication number Publication date
FI72956B (fi) 1987-04-30
FI853954A0 (fi) 1985-10-10
FI72956C (fi) 1987-08-10

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