EP0671503A2 - Dispositif et procédé pour la déshumidification des produits en forme pulpe par évaporation intensive - Google Patents

Dispositif et procédé pour la déshumidification des produits en forme pulpe par évaporation intensive Download PDF

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Publication number
EP0671503A2
EP0671503A2 EP95500029A EP95500029A EP0671503A2 EP 0671503 A2 EP0671503 A2 EP 0671503A2 EP 95500029 A EP95500029 A EP 95500029A EP 95500029 A EP95500029 A EP 95500029A EP 0671503 A2 EP0671503 A2 EP 0671503A2
Authority
EP
European Patent Office
Prior art keywords
pulp
housing
heat
supplying fluid
worm screw
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Withdrawn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
EP95500029A
Other languages
German (de)
English (en)
Other versions
EP0671503A3 (fr
Inventor
Marc Undebarrena Canal
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.)
MC'ENMAN SL
Original Assignee
MC'ENMAN SL
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
Priority claimed from ES9400489A external-priority patent/ES2110870B1/es
Application filed by MC'ENMAN SL filed Critical MC'ENMAN SL
Publication of EP0671503A2 publication Critical patent/EP0671503A2/fr
Publication of EP0671503A3 publication Critical patent/EP0671503A3/fr
Withdrawn legal-status Critical Current

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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/18—De-watering; Elimination of cooking or pulp-treating liquors from the pulp
    • 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
    • F26B17/18—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by rotating helical blades or other rotary conveyors which may be heated moving materials in stationary chambers, e.g. troughs
    • F26B17/20—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by rotating helical blades or other rotary conveyors which may be heated moving materials in stationary chambers, e.g. troughs the axis of rotation being horizontal or slightly inclined

Definitions

  • the present invention refers to an apparatus and a method for dehumidifying products in pulp form and in suspension by intensive evaporation, having applications in various fields such as the dehumidifying of paper or wood pulps, sludges from waste water purification plants and others; they can be used for any humid and/or pulp product whose humidity must be reduced substantially.
  • the main objective of the present invention is to provide an apparatus for dehumidifying or drying pulp-like humid products, such as paper or wood pulps, purification plant sludges and the like, with high performance, to permit the pulp to be dried to adequate maximum levels of humidity.
  • pulp-like humid products such as paper or wood pulps, purification plant sludges and the like
  • the apparatus for dehumidifying products in pulp form by intensive evaporation in accordance with the invention is provided with means of heating the pulp by a heat-supplying fluid, and is characterized in that it further includes: a substantially tubular housing, inside which the pulp is transported, provided with at least one hood for the extraction of vapours, and inlet and outlet mouths for the input and output of the pulp; and a device for advance of the pulp through the housing, between the inlet and outlet mouths.
  • This apparatus has a very high overall heat transmission coefficient, so that its thermal performance is optimum and it does not take up a large amount of space; furthermore, its installation cost is relatively low, while its running cost is also lower than that of known systems, as it has lower primary thermal fluid requirements.
  • the pulp-advance device comprises a rotating tubular core, around the exterior surface of which is wound a spiral member of a diameter slightly smaller than the diameter of the bottom part of the tubular housing, so that the tubular core and spiral member assembly constitutes a worm screw for transportation of the pulp along the housing, while inside the tubular core and attached thereto is arranged a feed pipe for a heat-supplying fluid, which constitutes at least part of the heating means.
  • the pulp therefore receives heat from the fluid over all the inner surface area of the same worm screw which transports it through the housing.
  • the spiral member onto the spiral member is fitted at least one coiled tube, inside which there circulates a heat-supplying fluid, such that the exterior diameter of the assembly formed by the spiral member and the coiled tube is slightly smaller than the diameter of the bottom of the housing.
  • a plurality of coiled tubes are fitted sequentially along the spiral member, each of the tubes having one end connected to the heat-supplying fluid feed pipe and the opposite end connected to a cylindrical chamber which is located between the tubular core and the heat-supplying fluid feed pipe; means are also envisaged for extraction of condensates from within the cylindrical chamber.
  • This characteristic permits heat-supplying fluid to be fed at high temperature throughout the entire length of the housing with a single feed pipe, thus avoiding the supply of heat reducing as the pulp advances through the housing.
  • the diameter of the tubular core is larger in the region near the pulp outlet mouth than in the region near the inlet mouth thereof, so that the space available for pulp transportation diminishes between the inlet mouth and the outlet mouth.
  • This system facilitates transportation of the pulp and its contact with the heat-exchange surfaces throughout the entire housing.
  • the housing is made up of a lower part with a U-shaped cross-section and by a cover bearing the vapour extraction hoods. This construction facilitates assembly and maintenance of the apparatus, while the inner shape of the housing further assists evacuation of vapours from the pulp.
  • One important characteristic of the invention provides for the bottom part of the tubular housing to be surrounded along at least part of its length by at least one outer sleeve, through which heat-supplying fluid circulates, thus allowing heat to be supplied to the pulp through all its contact surfaces and thereby increasing the overall heat transmission coefficient of the apparatus.
  • At least part of the exterior surfaces are covered with a heat-insulation material.
  • the apparatus includes means of drainage of condensates from the coiled tube, the tubular core and the sleeve.
  • the apparatus further includes means for cleaning the pulp-advance device, set in the interior of the housing at least along a region close to the pulp inlet mouth, thus avoiding the pulp adhering while it dries and becoming encrusted on the pulp advance device.
  • the cleaning means comprise a secondary worm screw arranged to rotate parallel to the pulp-advance worm screw, so that the spiral members of both worm screws overlap at least partially.
  • the apparatus also includes a plurality of scraping elements, which during rotation enter into contact with the pulp-advance worm screw.
  • scraping elements can be attached to the housing, while others are secured to the secondary worm screw; advantageously, they comprise spiral springs.
  • the apparatus is also provided with a device for spraying vapour onto the cleaning parts and the advance device; the assembly can thereby be cleaned periodically.
  • the apparatus includes a pulp level detector located in the region near the pulp inlet mouth; this detector allows system feed to be regulated in accordance with the amount of pulp present in the apparatus at any given time.
  • the apparatus further includes means for heating at least part of the housing, fitted on the outside thereof.
  • the invention also refers to a method for dehumidifying products in pulp form by intensive evaporation, in which the pulp is heated by means of a heat-supplying fluid. It is characterized in that the pulp is transported inside a housing, from an inlet mouth to an outlet mouth, by means of a rotating worm screw assembly, and in that during this transportation heat is supplied to the pulp by at least one of the following means:
  • Circulation of the heat-supplying fluid through the coiled tube can take place in the same direction as transportation of the pulp along the housing, or in the opposite direction, and the same applies to circulation of the fluid inside the worm screw.
  • the relative directions of the various currents of heat-supplying fluid have an influence on the convection of the water vapour and of the air in the region of the material to be dried.
  • the heat-supplying fluid should be chosen between saturated water vapour, overheated water vapour, hot gases or thermal oil.
  • hot air is also blown inside the area occupied by the pulp in order to facilitate extraction of the vapours produced and to avoid cooling and condensation in the material to be dried.
  • Figures 1a and 1b taken together, show an elevation view of the apparatus of the invention, for partial or total drying of products such as pulps, sludge, muds and the like.
  • the apparatus comprises a substantially tubular fixed housing 1, which the drawings show to be made up of a lower part 2 of "U" section (as can best be seen in Figure 4), and a cover 3.
  • the housing 1 presents an inlet mouth 4 and an outlet mouth 5 for the product to be dried, situated at opposite ends of the apparatus; on the cover is a hood 9 for extraction of the vapours given off by the product as it is dried.
  • the apparatus To the exterior of the housing 1 the apparatus presents three sleeves 6, whose function will be explained below, provided with longitudinal 7 and transversal 8 reinforcement means.
  • FIG. 2 shows a longitudinal section of the apparatus.
  • a device 10 for forward movement of the pulp or sludge introduced through the inlet mouth 4 on to the outlet mouth 5.
  • the pulp advance device comprises a tubular core 11 which rotates driven by a motor 12 ( Figures 1b, 2) and which has a helicoidal winding 13 on its outer surface, forming a worm screw which forces the pulp to advance through the housing.
  • a feed pipe 14 for a heat-supplying fluid for example saturated or overheated water vapour.
  • This pipe 14 is integral with the tubular core, and between them is defined a cylindrical chamber 15.
  • a number of coiled tubes 16 each one of which, as can be seen in Figures 3 and 4, is connected at one end 16a to the vapour feed pipe 14 and at the other end 16b to the interior of the cylindrical chamber 15; for the purposes of greater clarity, the entire coiled tube 16 is shown in section view in Figure 4.
  • the vapour thus circulates through the pipe 14 and the coiled tubes 16, which are in contact with the pulp to be dried.
  • the vapour travels through each coiled tube from 16a to 16b, releasing heat to the pulp for evaporation of the water contained therein, discharging finally into the chamber 15, ideally in the form of condensate; as will be described below, the condensates collected in the chamber 15 are eliminated through a drain trap.
  • the tubular core 11 can increase in diameter between the region of the pulp input and the region of pulp output, so that the space available between the tubular core 11 and the housing 1, that is, the space occupied by the pulp, diminishes gradually as the pulp dries, thus facilitating its transportation.
  • the sleeves 6 surround the exterior of the housing 1; in one embodiment of the invention vapour or another heat-supplying fluid also circulates inside these sleeves, thereby improving the overall heat transmission coefficient of the apparatus.
  • a pipe 17 which forms a drain trap inside the chamber ( Figures 1b and 2) is also provided for elimination of the condensed vapour which accumulates in the cylindrical chamber 15.
  • the direction of circulation of each one of the different vapour currents described can coincide or be different from the direction of pulp advance.
  • Figures 1a and 1b show in highly schematic form the ends of the apparatus: the tubular core is attached to a spindle 20 mounted between bearings blocks 21 and driven in rotation at a speed which can be variable from the motor 12.
  • the apparatus is provided at the most appropriate locations with valves for draining off the condensates, which valves can be rotary, depending on their position.
  • the exterior surface of the apparatus can be covered with an insulating material, in order to improve its thermal performance.
  • FIGS 5 and 6 show, within housing 1, above the worm screw 10 which constitutes the described pulp-advance device, the apparatus further incorporates a secondary worm screw 100, also rotary, whose purpose is to avoid the pulp adhering to the tubular core 11, to the helicoidal winding 13 and the coiled tube 16, which together make up the worm screw 10.
  • a secondary worm screw 100 also rotary, whose purpose is to avoid the pulp adhering to the tubular core 11, to the helicoidal winding 13 and the coiled tube 16, which together make up the worm screw 10.
  • the worm screw 100 can be fitted along the region of the apparatus near the pulp inlet mouth, although it is preferable that it occupies substantially the entire inner length of the apparatus.
  • the worm screw 100 can be driven, for example, by a toothed chain transmission from the main worm screw of the apparatus. It can rotate in the same direction as the pulp advance worm screw, or in the opposite direction.
  • the apparatus also includes scraping parts 110,110' in the form of spiral springs of relatively high stiffness, some fixed to the inner wall of the housing 1 and others integral with the worm screw 100.
  • Figure 5 shows only two scraping elements 110,110', although the apparatus includes a plurality of these elements fitted throughout its length on both sides of the pulp-advance device and, for example, distributed so that they form a spiral around the spindle of the worm screw 100.
  • the winding 13 and the coiled tube 16 gradually come into contact with the scraping parts 110, 110', which therefore exercise a supplementary cleaning and scouring effect; in order to maintain suitable contact with the winding 13 and the coiled tube 16, while at the same time allowing them to rotate, the scraping parts 110,110' can bend.
  • the secondary worm screw 100 can also be fitted laterally with respect to the device 10.
  • the interior of the apparatus has a pressurized vapour tube 120 with a plurality of spray nozzles (Figure 5); periodically, for example every 24 hours, vapour can be projected under pressure against the worm screw 100 and the scraping parts 110,110'.
  • the latter is provided with a device 130 of a known type to detect the level of the pulp.
  • both the worm screw 10 and the secondary worm screw 100 can be of variable pitch and of the same or different diameters.
  • the pulp or sludge to be dried is fed into the housing through the inlet mouth 4, and the worm screw forces it to advance through the housing to the outlet mouth 5.
  • the pulp receives the heat provided by the fluid circulating through pipe 14 and through the coiled tubes 16 and the sleeves 6, so that the water contained in the pulp evaporates and emerges through the extractor hood 9.
  • the pulp is transported through the interior of the housing 1, from the inlet mouth 4 to the outlet mouth 5, by means of the rotating worm screw assembly 11,13; during this transportation heat is supplied to the pulp by at least one of the following means:
  • the tubular core to which the coiled tubes are attached
  • the latter could be wound directly on the tubular core and themselves constitute the thread of the worm screw;
  • the pitch of the windings and/or of the coiled tubes can be variable, for example in order to provide greater heat at some points of their travel than at others.
  • a system could likewise be provided to facilitate evacuation of the vapours which evaporate from the pulp, for example by blowing air into the area occupied by the pulp through one or more inlets made in the housing.
  • the shape and the number of the sleeves, together with the proportion of surface area they occupy, can be different from those shown; similarly, the number of coiled tubes and the way of feeding them with heat-supplying fluid can be different from those described.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
EP95500029A 1994-03-10 1995-03-08 Dispositif et procédé pour la déshumidification des produits en forme pulpe par évaporation intensive Withdrawn EP0671503A3 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
ES9400489 1994-03-10
ES9400489A ES2110870B1 (es) 1994-03-10 1994-03-10 Aparato y procedimiento para deshumectar productos en forma de pasta por evaporacion intensiva.
ES9401210A ES2121487B1 (es) 1994-03-10 1994-06-03 Mejoras en el objeto de la patente principal p 9400489, por "aparato y procedimiento para deshumectar productos en forma de pasta por evaporacion intensiva.
ES9401210 1994-06-03

Publications (2)

Publication Number Publication Date
EP0671503A2 true EP0671503A2 (fr) 1995-09-13
EP0671503A3 EP0671503A3 (fr) 1999-01-20

Family

ID=26154776

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95500029A Withdrawn EP0671503A3 (fr) 1994-03-10 1995-03-08 Dispositif et procédé pour la déshumidification des produits en forme pulpe par évaporation intensive

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EP (1) EP0671503A3 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6393728B1 (en) 1998-07-02 2002-05-28 Metso Paper, Inc. Method and apparatus for drying pulp
WO2009010018A1 (fr) * 2007-07-16 2009-01-22 Stanislav Tuma Dispositif permettant de sécher des matériaux pâteux et en vrac et des boues
CN108677590A (zh) * 2018-07-08 2018-10-19 池巧明 一种纸浆平铺装置
CN117139344A (zh) * 2023-09-12 2023-12-01 四川云华川科技有限公司 一种生活垃圾连续化多层热解反应釜

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3877365A (en) * 1973-07-09 1975-04-15 Krima Maskinfabrik Ab Adjustable pressure worm press
WO1992018214A2 (fr) * 1991-04-10 1992-10-29 Remediation Technologies, Inc. Systeme et procede servant a extraire un constituant volatil d'une matrice

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS603152B2 (ja) * 1980-10-16 1985-01-25 倉敷紡績株式会社 汚泥等の乾燥装置
SU1370404A2 (ru) * 1986-08-11 1988-01-30 Грузинский политехнический институт им.В.И.Ленина Шнековый теплообменник

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3877365A (en) * 1973-07-09 1975-04-15 Krima Maskinfabrik Ab Adjustable pressure worm press
WO1992018214A2 (fr) * 1991-04-10 1992-10-29 Remediation Technologies, Inc. Systeme et procede servant a extraire un constituant volatil d'une matrice

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Section Ch, Week 8223 Derwent Publications Ltd., London, GB; Class D15, AN 82-47009E XP002086199 & JP 57 070384 A (KURABO IND LTD) , 30 April 1982 *
DATABASE WPI Section Ch, Week 8833 Derwent Publications Ltd., London, GB; Class J08, AN 88-234027 XP002086200 & SU 1 370 404 A (GEOR POLY) , 30 January 1988 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6393728B1 (en) 1998-07-02 2002-05-28 Metso Paper, Inc. Method and apparatus for drying pulp
WO2009010018A1 (fr) * 2007-07-16 2009-01-22 Stanislav Tuma Dispositif permettant de sécher des matériaux pâteux et en vrac et des boues
CN108677590A (zh) * 2018-07-08 2018-10-19 池巧明 一种纸浆平铺装置
CN117139344A (zh) * 2023-09-12 2023-12-01 四川云华川科技有限公司 一种生活垃圾连续化多层热解反应釜
CN117139344B (zh) * 2023-09-12 2024-04-09 四川云华川科技有限公司 一种生活垃圾连续化多层热解反应釜

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Publication number Publication date
EP0671503A3 (fr) 1999-01-20

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