Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F26—DRYING
  • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
  • F26B9/00—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards
  • F26B9/10—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards in the open air; in pans or tables in rooms; Drying stacks of loose material on floors which may be covered, e.g. by a roof
  • F26B9/103—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards in the open air; in pans or tables in rooms; Drying stacks of loose material on floors which may be covered, e.g. by a roof using fixed or removable drying air channels placed in the stack, e.g. horizontally or vertically
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F26—DRYING
  • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
  • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
  • F26B21/06—Controlling, e.g. regulating, parameters of gas supply
  • F26B21/10—Temperature; Pressure
• • 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
  • F26B25/22—Controlling the drying process in dependence on liquid content of solid materials or objects

Definitions

• the present invention relates to a method of storing organic fibrous material in a stack, barn or the like.
• the invention also relates to an arrangement for carrying out this method, comprising a pipe which is perforated over at least part of its length and is connected via valves to the pressure side of a fan for blowing air into the stack, and a control unit which actuates the valves, connected to a temperature indicator for. monitoring the temperature of the material in the stack, this unit being designed to control the blowing in of air into the stack so that the temperature of the material lies within a predetermined temperature range.
• the aim of the present invention is to provide a method and an arrangement for storing fibroua material in a stack, this storage being effected in such a way that the heat content of the material is increased as the thermal energy released during storage is used, and this is made possible due to the fact that the storage is carried out as revealed in the characteristics in the attached Patent Claims.
• Figure 1 shows in the form of a block diagram an arrangement which operates in the way proposed by the invention.
• Figure 2 shows schematically a preferred embodiment of a barn for storing organic fibrous material.
• Figure 3a shows in perspective how, according to the invention, per forated pipes are arranged vertically for blowing air into the stack and for sucking out warmed up and moist air.
• Figure 3b is a detail from Figure 3A, and shows how the perforated pipes may be fixed in the floor of the barn.
• Figure 4 is a cross-section through the barn shown in Figure 2.
• Figure 5 shows an alternative embodiment of an arrangement according to. the invention.
• parts with the same or similar functions have been given the same reference numerals.
• FIG 1 is a stack which contains organic fibrous material such as chips, bark and/or so-called organic industrial waste, for example.
• the stack is assumed to be lying in a well-insulated chamber of the kind which will be described in more detail in connection with Figures 2 -4.
• air is blown into the stack at a number of levels depending on the height of the stack, and at each level, at a number of points preferably distributed evenly over the cross-section of the stack. This is accomplished by means of a plurality of pipes 2 which are disposed vertically and ar perforated over at least part of their length and are pre ferably divided up in the longitudinal direction into chambers 3, 4, 5 which are separated from each other.
• the air is sucked out from the said levels by means of vertically arranged perforated pipes 6 of the same type as the pipes 2, arranged at a distance from the latter.
• the pipes 6 are also divided up into chambers 7, 8, 9.
• the pipes 6 are equipped with a temperature indicator 10 which is connected to a control unit 11.
• the pipes 2 are connected via a valve element 12 to the pressure side of a fan 13, and the pipes 6 are connected via a valve element 14 and a combined heat-exchanger and demoisturiser 15 to the suction side of the fan 13.
• the valve elements 12, 14 are connected to and controlled by the control unit 11.
• the temperature measured at each suction point by means of the temperature indicator 10 controls the blowing in of air so that the temperature of the material in the stack is kept within a predetermined temperature range.
• the biological processes which take place in a stack of organic fibrous material produce a considerable amount of heat energy which can even cause self-ignition.
• the fibrous material in the stack has a relatively high water-content which must be reduced so that the combustion level of the fibrous material will be sufficiently high with regard to fuel economy. Due to the heat produced, the water is vapourised and as a result is sucked out of the stack with the air.
• the water and heat content of the sucked-out air is collected., after which the air, thus dried and cooled, is used for blowing into the stack 1.
• the collected heat may be used for heating purposes of various kinds, such as, for example, for drying timber or for heating areas of a sawmill.
• the generation of heat in the stack can be accelerated and intensified by making up the stored fibrous material from a mixture of different types and different size categories of organic fibrous material, for example, birch chips, ground bark and other fibrous waste, together with chips of coniferous trees and forest waste containing needles.
• the fibrous material may be stored under the best conditions and so that the considerable amount of heat energy which is formed during storage may be made use of, according to the invention storage should be carried out indoors in a barn of the type which is shown schematically in Figures 2 -4.
• the barn is made. up of corrugated sheet which at the same time is a roof, the long side 16 being held in place by roof trusses 17 which are supported on baseplates 18.
• the gable ends are in the shape of a triangle with a base of approximately 30 m and a height of approximately 32 m.
• the barn is extended expediently in sections according to requirements, but is preferably approximately 100 m.
• the stack in the barn is fed in from above, for example, by a belt or screw conveyor 19 arranged under the ridge of the barn, in the longitudinal direction there ⁇ f; see Figure 3.
• the fibrous material is delivered from the conveyor via inlet openings 20 along the conveyor 19.
• Thes may be opened and closed so that it is possible to control where along the longitudinal extent of the barn delivery will take place.
• Removal from the barn is effected by means of conveyors 21 which move from the longitudinal sides of the barn towards a conveyor 22 arranged in the centre of the barn in its floor, or above this, directly under the conveyor 19.
• the blowing-in pipes 2 are fixed in the floor 23 of the barn between the conveyors 21 (see Figure 4) and are supplied via pressure lines 24 laid out in the floor.
• FIG. 4 also shows how the fan 13, driven by an electromotor 27, may be connected to suction lines 26 and to the pressure lines 24 via a heat-exchanger/ demoisturiser 15. The condensed water from the sucked-out air is conducted away via a line 28.
• blowing-in and suction pipes 2, 6 are not made of perforated pipe divided .up into chambers, which are preferred, but not essential.
• the said pipes consist of a number of separate pipes of various lengths, perforated at different levels so that blowingin and suction can be effected as described earlier.
• the blowing-in and suction is controlled as before, by the control unit 11 via motors 29 acting on the valve elements 12, 14; only one of these motors is shown in the Figure.
• the temperature indicator 10 is connected to the control unit 11 via a connection box 30.
• the control unit 11 is made up of a chart recorder 31 with relay outputs 32. The outputs have a memory function so as to simplify the construction of the control unit.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Drying Of Solid Materials (AREA)
• Processing Of Solid Wastes (AREA)
• Treatment Of Fiber Materials (AREA)
• Paper (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=20336948

Family Applications (1)

Country Status (6)

Families Citing this family (6)

Family Cites Families (6)

• 1979
  • 1979-05-15 JP JP50065079A patent/JPS56500572A/ja active Pending
  • 1979-05-15 GB GB8113390A patent/GB2070752B/en not_active Expired
  • 1979-05-15 DE DE19792953666 patent/DE2953666A1/de not_active Withdrawn
  • 1979-05-15 WO PCT/SE1979/000107 patent/WO1980002573A1/en not_active Ceased
• 1980
  • 1980-12-01 EP EP19790900530 patent/EP0028596A1/en not_active Withdrawn
• 1981
  • 1981-01-15 DK DK16481A patent/DK16481A/da unknown

Non-Patent Citations (1)

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