EP0460587A1 - Dispositif pour le séchage des boues - Google Patents

Dispositif pour le séchage des boues Download PDF

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Publication number
EP0460587A1
EP0460587A1 EP91109068A EP91109068A EP0460587A1 EP 0460587 A1 EP0460587 A1 EP 0460587A1 EP 91109068 A EP91109068 A EP 91109068A EP 91109068 A EP91109068 A EP 91109068A EP 0460587 A1 EP0460587 A1 EP 0460587A1
Authority
EP
European Patent Office
Prior art keywords
sludge
hot gas
drying
hose
annular gap
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP91109068A
Other languages
German (de)
English (en)
Inventor
Heidrun Dr. Barnert-Wiemer
Thomas Glorius
Erich Schöber
Jan G.A.M. Postmes
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Forschungszentrum Juelich GmbH
Original Assignee
Forschungszentrum Juelich GmbH
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 Forschungszentrum Juelich GmbH filed Critical Forschungszentrum Juelich GmbH
Publication of EP0460587A1 publication Critical patent/EP0460587A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B17/00—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
    • F26B17/10—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by fluid currents, e.g. issuing from a nozzle, e.g. pneumatic, flash, vortex or entrainment dryers
    • F26B17/101—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by fluid currents, e.g. issuing from a nozzle, e.g. pneumatic, flash, vortex or entrainment dryers the drying enclosure having the shape of one or a plurality of shafts or ducts, e.g. with substantially straight and vertical axis
    • F26B17/103—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by fluid currents, e.g. issuing from a nozzle, e.g. pneumatic, flash, vortex or entrainment dryers the drying enclosure having the shape of one or a plurality of shafts or ducts, e.g. with substantially straight and vertical axis with specific material feeding arrangements, e.g. combined with disintegrating means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
    • F26B25/001—Handling, e.g. loading or unloading arrangements
    • F26B25/002—Handling, e.g. loading or unloading arrangements for bulk goods
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/02—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air
    • F26B3/10—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour carrying the materials or objects to be dried with it
    • F26B3/12—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour carrying the materials or objects to be dried with it in the form of a spray, i.e. sprayed or dispersed emulsions or suspensions

Definitions

  • the invention relates to a device for drying sludge, equipped with a metering device, which is provided with an opening for filling the sludge and a sludge forming attachment, which is followed by a drying room, over the drying path of which the shaped sludge with one of a hot gas stream starting from the hot gas stream is dried to granules, and which is designed with an outlet opening for discharging the dried, granulated material.
  • the high proportion of sewage sludge resulting from wastewater treatment is an increasing problem, especially since sewage sludge is not or hardly used as a fertilizer in agriculture for environmental reasons. Therefore, the combustion of sewage sludge has become increasingly important in recent years.
  • the sewage sludge must first be dried, which is done in a first step by mechanical dewatering.
  • a direct subsequent combustion is not yet possible, since combustion at this stage would be very energy-intensive due to the still high proportion of capillary water in the sludge. It is therefore endeavored to process the pre-dried sewage sludge into dry granulate in a second step.
  • drying section Since the drying section is relatively long due to the use of an assembly line, a correspondingly dimensioned drying room is required and a correspondingly high energy expenditure is required for effective drying, especially since part of the energy is lost unused for the drying process due to the size of the drying room.
  • the object on which the invention is based is achieved in that the metering device is equipped with a horizontally arranged annular gap as a shaping means.
  • the sewage sludge flowing through it is shaped as it passes through the annular gap to form a hose flowing vertically into the dryer room.
  • a hot gas stream is directed into its cavity, which tears the mud hose so that the surface of the material to be dried is enlarged and the drying speed is increased.
  • the pieces of sludge tearing off from the lower area of the hose wall thus fall as granules into the subsequent drying room.
  • the in the cavity of the hose directed hot gas flow is thus surrounded on all sides by the material to be dried, so that - in contrast to the belt dryer - the energy used is used in a very targeted and therefore concentrated manner for the drying process in a confined space.
  • This therefore leads to a faster and more effective drying of the sewage sludge with a very low outlay on equipment.
  • Such a device is particularly suitable for sewage sludge, which after dewatering gives a dry matter in the range of 15 - 50% (weight of the sludge before dewatering / weight of the sludge after dewatering), but also for other highly viscous substances, the dry weight of which Drainage is in the specified range, such as paper pulp.
  • Other formulations, which bring the sludge into a self-contained form and form an internal cavity can of course also be used as the shaping means, such as, for example, a square or elliptical form.
  • one embodiment of the device is a cone, which is attached below the annular gap and projects with the tip into the middle of the hot gas flow. This causes the hot gas flow to be directed onto the inner wall of the hose, thus creating a distinctly hot drying zone in the lower hose wall area. The most concentrated or fastest drying of the sludge takes place within this zone, so that the hose becomes porous and disintegrates into homogeneous granules with a dried surface. The heat rising around the cone leads to the formation of a preheating zone above the cone, which further accelerates the drying process.
  • the granules falling off the lower hose wall area are collected by offset, obliquely falling sheets which are arranged as baffles around the hot gas source.
  • the dried surface of the granulate prevents sticking on the strongly heated baffles, so that the product gradually slides over the sloping sheets and thus travels through the further drying section (exploitation of the Leidenfrost phenomenon).
  • This configuration offers the particular advantage that the residence time of the granules in the drying room is extended, which leads to the desired drying out of the product.
  • a burner whose flame extends into the cavity of the hose is expediently used as the hot gas source.
  • the use of a pulse burner is particularly advantageous: the pulsations caused by a pulse burner lead to an improvement in the heat-to-material transfer and thus only allow short-term contact of the product in the hot gas. This prevents undesired partial burns of the material to be dried and - in connection with this - the formation of dust-containing exhaust gases and only achieves the desired drying process.
  • the pulsations caused by the pulse burner set the baffles mentioned above in vibration, which additionally prevents the granules from sticking to the baffles and thus further improves the sliding of the product over the sloping metal sheets.
  • Another embodiment of the device is the adjustability of the annular gap width.
  • This offers the particular advantage that the tube wall thickness can be set in the optimum range for the drying process and the width of the annular gap can be adapted to the rheology of the material, especially since predrying by means of mechanical dewatering leads to sewage sludges with very different viscosities. This means that the mass flow into the dryer room can be metered or a variable mass throughput is guaranteed.
  • the adjustability of the annular gap width enables simple and effective self-cleaning of the apparatus: for example, incrustations in the annular gap area can be easily removed by quickly opening and closing the annular gap.
  • An extruder is particularly suitable as a metering device: its screw conveyor is particularly suitable for mixing and thus homogenizing viscous sewage sludge, which above all contributes to improved hose consistency.
  • the screw conveyor of an extruder is also particularly suitable for the further transport of viscous sewage sludge to the subsequent annular gap.
  • the use of a screw conveyor that runs several times in the annular gap area additionally ensures a uniform discharge of the sludge into the tube shape.
  • an extruder as a metering device also offers the possibility of varying the screw conveyor design: For example, for highly viscous special sewage sludges, a vertically swinging screw conveyor or a screw blade, which is located between a fixed, perpendicularly around the central axis of the extruder Inner cylinder and the outer wall of the extruder rotates freely. Both versions ensure an even more intensive mixing and an even better transport of the sewage sludge, so that a jam and thus a clogging of the metering device is prevented, especially in the annular gap area.
  • the sludge drying device is shown schematically. According to this figure, the device is surrounded by a cylindrical casing 1.
  • the sludge to be dried is filled into the extruder 3 from above via the funnel 2.
  • Whose screw conveyor 4 transports the sludge to the annular gap 5.
  • the sludge is formed into a hose 6 during the passage through the annular gap 5, which flows vertically into the dryer chamber.
  • the flame 8 generated by a burner 7 projects into the cavity of the sludge hose 6, so that it is dried from the inside.
  • a cone 9 protruding with the tip into the middle of the flame 8 directs the flame 8 towards the inner wall of the hose 6.
  • a particularly hot drying zone is thus generated there, within which the hose becomes porous, tears and thus dries particularly quickly.
  • the falling granulate is collected by sloping sheets 10, which are arranged offset from one another in the dryer space around the burner 7 and serve as baffles.
  • the product slides gradually over these sheets 10 in the drying room and is further dried in the process.
  • the dried granulate falls from the bottom chicane through the discharge opening 12 to the floor of the drying room and is transported there to the outside by means of a discharge screw 11.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • Drying Of Solid Materials (AREA)
  • Treatment Of Sludge (AREA)
EP91109068A 1990-06-05 1991-06-04 Dispositif pour le séchage des boues Withdrawn EP0460587A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19904017970 DE4017970C1 (fr) 1990-06-05 1990-06-05
DE4017970 1990-06-05

Publications (1)

Publication Number Publication Date
EP0460587A1 true EP0460587A1 (fr) 1991-12-11

Family

ID=6407806

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91109068A Withdrawn EP0460587A1 (fr) 1990-06-05 1991-06-04 Dispositif pour le séchage des boues

Country Status (2)

Country Link
EP (1) EP0460587A1 (fr)
DE (1) DE4017970C1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113292221A (zh) * 2021-06-07 2021-08-24 甘泉 一种污泥干化的方法和设备

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4234952A1 (de) * 1992-10-16 1994-04-21 Kloeckner Humboldt Deutz Ag Verfahren und Vorrichtung zur thermischen Trocknung von Schlämmen
CN109028924A (zh) * 2018-06-12 2018-12-18 金寨县金银山农业科技开发有限公司 一种用于种子烘干设备的新型放粮斗

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB141468A (en) * 1919-03-01 1920-04-22 John Charles Brian Vertical drying kiln
DE743156C (de) * 1941-04-25 1943-12-18 Ig Farbenindustrie Ag Verfahren und Vorrichtung zur kurzzeitigen Behandlung empfindlicher Stoffe mit gasfoermigen Mitteln
GB589544A (en) * 1941-10-09 1947-06-24 Niro Atomizer As Improvements in and relating to methods and apparatus for treating liquid spray witha gaseous medium
DE743731C (de) * 1941-04-06 1952-08-21 I G Farbenindustrie A G Frankf Verfahren und Vorrichtung zum Zerstaeuben plastischer Massen
US2941310A (en) * 1955-05-16 1960-06-21 Ruhrchemie Ag Treatment of grain
US4183145A (en) * 1978-03-02 1980-01-15 Frolikov Ivan I Method of spray-drying liquid and pastelike materials and installation for carrying same into effect
WO1980001246A1 (fr) * 1978-12-14 1980-06-26 Sonic Dehydrators Appareillage de sechage par pulverisation utilisant des machines a jets pulses
FR2455509A1 (fr) * 1979-05-04 1980-11-28 Autoclavite Procede et dispositif de fabrication de garniture d'etancheite autolubrifiante
AU4828385A (en) * 1984-10-02 1986-04-10 Akt Consultants Pty Limited Dehydrator

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB141468A (en) * 1919-03-01 1920-04-22 John Charles Brian Vertical drying kiln
DE743731C (de) * 1941-04-06 1952-08-21 I G Farbenindustrie A G Frankf Verfahren und Vorrichtung zum Zerstaeuben plastischer Massen
DE743156C (de) * 1941-04-25 1943-12-18 Ig Farbenindustrie Ag Verfahren und Vorrichtung zur kurzzeitigen Behandlung empfindlicher Stoffe mit gasfoermigen Mitteln
GB589544A (en) * 1941-10-09 1947-06-24 Niro Atomizer As Improvements in and relating to methods and apparatus for treating liquid spray witha gaseous medium
US2941310A (en) * 1955-05-16 1960-06-21 Ruhrchemie Ag Treatment of grain
US4183145A (en) * 1978-03-02 1980-01-15 Frolikov Ivan I Method of spray-drying liquid and pastelike materials and installation for carrying same into effect
WO1980001246A1 (fr) * 1978-12-14 1980-06-26 Sonic Dehydrators Appareillage de sechage par pulverisation utilisant des machines a jets pulses
FR2455509A1 (fr) * 1979-05-04 1980-11-28 Autoclavite Procede et dispositif de fabrication de garniture d'etancheite autolubrifiante
AU4828385A (en) * 1984-10-02 1986-04-10 Akt Consultants Pty Limited Dehydrator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113292221A (zh) * 2021-06-07 2021-08-24 甘泉 一种污泥干化的方法和设备

Also Published As

Publication number Publication date
DE4017970C1 (fr) 1991-08-22

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