DK152037B - Apparatus for drying of manure and similar waste products - Google Patents

Apparatus for drying of manure and similar waste products Download PDF

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Publication number
DK152037B
DK152037B DK093479AA DK93479A DK152037B DK 152037 B DK152037 B DK 152037B DK 093479A A DK093479A A DK 093479AA DK 93479 A DK93479 A DK 93479A DK 152037 B DK152037 B DK 152037B
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DK
Denmark
Prior art keywords
arm
shaft
stirrer
drying chamber
drying
Prior art date
Application number
DK093479AA
Other languages
Danish (da)
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DK93479A (en
DK152037C (en
Inventor
Per Aake Nilsson
Original Assignee
Per Aake Nilsson
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 Per Aake Nilsson filed Critical Per Aake Nilsson
Priority to DK93479 priority Critical
Priority to DK093479A priority patent/DK152037C/en
Publication of DK93479A publication Critical patent/DK93479A/en
Publication of DK152037B publication Critical patent/DK152037B/en
Application granted granted Critical
Publication of DK152037C publication Critical patent/DK152037C/en

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    • Y02A40/208

Description

DK 152037B
The present invention relates to an apparatus for drying manure and of the nature specified in the preamble of claim 1.
For dryers of this kind used for drying 5 e.g. chicken manure to reduce the odor of the fertilizer and to increase the manageability of the fertilizer, the agitator stirrer arm is designed to iron against the upper surface of the bottom wall in the drying chamber to prevent fertilizer from burning to the bottom wall.
10
GB patent 155,493 discloses an apparatus for drying and partially eliminating moisture from materials, e.g. flotation concentrates obtained by ore treatment. This known apparatus has a reinforced bottom and the apparatus has a stirrer. The stirrer 15 is not biased and the reinforcing ribs are positioned against the base plate as whole ribs along the entire diameter of the base plate. The drying plate is made of cast iron, and it is made of an elongated tunnel. A large cast plate is, firstly, extremely expensive and, secondly, in principle impossible to get absolutely flat. Thus, this prior art indicates a completely different plate type.
As the dryer operates, the bottom wall of the drying chamber will be heated and expanded. As the bottom wall of the drying chamber is fixed to the side walls of the dryer, it will thereby settle, whereby the stirrer arm, which is relatively rigid, cannot be contacted by its displacement across the bottom wall against the entire surface of the bottom wall. Thus, in the known dryers, the fertilizer will burn on some portions 30 of the bottom wall, thereby reducing the heat transfer from the heating chamber below to the drying chamber. The stirrer arm is pushed upwards by the solid fertilizer and after a short time a cake of solid fertilizer is formed over the entire bottom of the drying chamber. Since solid manure during one step of the drying process has a very tough nature, the stirrer arm will be subjected to severe stresses which may result in deformations and fractures of the stirrer arm at its point of attachment to the stirrer shaft.
DK 152037 B j) 2 i!
It is an object of the present invention to provide a dryer of the type mentioned in the first paragraph which in a simple way ensures that the base plate is completely flat, whether or not it is! ^ cooled or heated, and that there is at all times an intimate engagement between the bottom surface of the stirrer and the opposite surface of the bottom wall.
This object is met by the fact that the device mentioned above is peculiar to that of the characterizing claim 1.
By stiffening the stiffening elements due to heat or cooling in their longitudinal direction, so as to make a somewhat winding longitudinal unit «On the other hand, the flat or 15th edge they * · lie ar ·? ir or dog plate absolutely fucking. and plan.
For example, the tops of the floor can be rectangular ribs j or p1 a d e j e r n, of which the narrow 1a n c s ~ d e 1 c g e ~ a a towards the j w w v j blind plate and the wide sides are perpendicular to the bottom plate. These stiffening elements in combination with a barrier, 20 of the stirrer arm and with the known wall-borne bottom wall, in a manner known in the art, make it possible to dry any type of sticky organic material which it is intended to treat. In this connection, it should be noted that exceptionally high demands are made for the surface to be absolutely smooth, which it has hitherto been impossible to solve for plates having a very large surface of, for example, up to 20 ma . In this regard, it should be borne in mind that the material to be dried is unusually sticky and directly adheres to the bottom when scraping is not 100 på.
30
Practical embodiments are set forth in the dependent claims.
The invention is described in more detail below with reference to the drawing, in which: FIG. 1 is a view taken along line I-I of FIG. Figure 3 is a sectional view of a fertilizer dryer designed in accordance with the invention;
DK 152037 B
FIG. 2 is a top view of the stirrer arm of the dryer, and FIG. 3 is a view taken along line 111 -111 of FIG. 1 is a sectional view of the dryer.
In the following description, the dryer according to the invention is applied as a non-limiting example for drying chicken manure. However, the dryer can be used for all kinds of similar waste products including council sludge from 10 municipal wastewater treatment plants.
A previously known fertilizer dryer is seen in FIG. 1 provided with a device according to the invention. The dryer, designated by reference numeral 1, is supported on a foundation 2 and has, in its lower portion, a heating chamber 3 which is connected to a heating apparatus 4, for example an oil burner. Above the heating chamber, a drying chamber 5 is arranged separated from the heating chamber by its flat bottom wall 6. An agitator 7 is arranged with a shaft 8 located centrally in the drying chamber 5, which preferably has a circular cross section. The agitator 7 has at the lower portion of the shaft 8 adjacent to the bottom wall 6 a rigid agitator arm 9 which is attached thereto, which along its stretch touches the upper surface of the bottom wall 6. A motor 11 coupled to the shaft 8 carried by means of a frame on the upper portion of the drying apparatus 2 is arranged to rotate the shaft 8 and thus the stirrer arm 9, which will thereby tear manure from the upper surface of the bottom wall and prevent fertilizer from burning up. on said surface. Fertilizer to be dried is fed to the drying chamber through a filling bore opening closed by means of a hatch. The shaft 8 has a guide not shown on the bottom wall 6.
Also shown on the upper part of the dryer is a condensing apparatus 20-27 for treating the steam and gas emitted from the fertilizer during the drying, to eliminate the odor problems which are generally present in the drying of the fertilizer. In the prior art dryers, the bottom wall 6 of the drying chamber, which is horizontal, is firmly connected to the side walls of the dryer. When the bottom wall 6 when operating the dryer in DK 152037B j i 4 i | | i j is heated, it will expand in the radial direction and thereby settle. Hereby, the stirrer arm 9, during its rotation across the bottom wall, will not touch the entire surface of the bottom wall, but portions of the bottom wall will either be elevated or generally recessed where the lower lying portions of the bottom wall will not be reached by the stirrer frame.
To remove dried manure from the drying chamber, a drain box or drawer 50 has been fitted, the drain drawer | 10 is delimited from the heating chamber by vertical walls and has in the bottom wall a hatch 51 which can be operated from the outside of the dryer. A previously known discharge drawer (not shown) has a horizontal bottom in plane with the bottom of the varnish chamber and an opening in the side wall of the dryer, through which dried manure 15
can be fed onto a conveyor belt. IN
! The dryer here also provides an outlet opening for the flue gases, and may be provided with a non-shown cumulative ionization apparatus for the flue gases to achieve a uniform temperature in the heating chamber. |
According to the invention, two characteristics are proposed which can be used separately or together to eliminate the problem of burning of fertilizer on the bottom wall of the drying chamber, whereby the 2g dryer is known in the art in steel.
Thus, the bottom wall 5 is freely supported at its peripheral in part by the side walls of the dryer on a flange, projecting or continuous flange device projecting from the sidewalls, preferably in a circular molding 12. The bottom wall 6 has a diameter which is! 30 when the heating chamber is heated to its operating temperature which is approx. 200eC, is insignificantly smaller than the diameter of the drying chamber at its bottom. Thus, when the dryer is not in operation, ie. is not heated, a clearance between the peripheral periphery edge of the bottom wall and the drying chamber sidewall, which allows the bottom wall to expand freely upon heating. Of course, when the bottom wall 6 loosely mounted on the list 12 is heated during operation of the dryer, it will expand for 5 minutes.
DK 152037 B
radial direction, but this extension is not prevented by the dryer's sidewalls, so the bottom wall will not be subjected to bays or straightening, it will not settle. Thus, during the rotation of the shaft 8, the stirring arm 9 will always abut against the upper surface of the bottom wall. In order to make the bottom wall stiffer, radii of stiffeners are arranged on the underside in the form of ribs 15, consisting of rectangular rods or flat iron plates, which are welded to one of the bottom walls at one of their narrow sides.
With the special point welding, the ribs 15 can be hooked longitudinally at temperature changes in their longitudinal direction so that they resemble a somewhat winding longitudinal unit. In contrast, the flat surface of the ribs 15, which abuts the bottom wall 6, 15 remains absolutely flat and flat. The ribs are arranged such that their narrow long sides abut the bottom wall, and the broad sides are perpendicular to the bottom plate. These stiffening elements in combination with a biasing of the arm allow the stirring or scraping arm to lie exactly over a large surface. When the heat is transferred to the stiffening elements and the bottom wall from the heating medium, these two parts will assume different temperatures, since the bottom wall is initially cooled by the mass lying on top. Below, the stiffening elements may move relative to the bottom wall in spite of. that the sta-2 5 you form an almost homogeneous part of this and keep the bottom wall completely flat in the radial direction even if the bottom is subjected to large loads and / or heat stresses.
This solves the problem of getting the prestressed agitator arm to lie exactly over a large surface of, for example, 20 mz. The preload must ensure that the stirrer arm depresses with a balanced pressure, thereby keeping the base plate completely clean. In this connection, it must be borne in mind that the drying material has a consistency like porridge and that the heat transfer by approx. 250 ° C under plate gives an effect where the pulp burns and / or adheres unless the scraping takes place perfectly.
DK 152037 B
6! !
Practical experience has also shown that the point-wise welding can take place alternately on one and the other side of the ribs. In practice, it has also been found that it is not _ absolutely necessary that the bottom wall be whole, but it can also be
ISLAND
designed as triangular "1 cookie" slices.
According to another characteristic of the apparatus according to the invention, a pressure arm 30 is arranged between the shaft 8 and the stirring arm. Around the shaft, at a distance from the lower part of the shaft, a collar 31 is secured with two projecting parallel ears 32, between which a shaft pin 33 is mounted. On the upper side of the stirrer arm, two opposite ears 34 are provided with an intermediate shaft pin 35. The pushing arm 30, which in a preferred embodiment of the stirrer assembly consists of two sections 35, 37 and an intermediate biasing means 38, is provided at at its ends fastened between said shaft pins by means of j sleeves. The pressure arm 30 can thus be rotated supported at both ends thereof. ! The section 36 of the pressure arm connected to shaft 8 consists of a first tube with a flange 39 at its free end. The section 37 of the pressure arm coupled to the stirrer arm 9 consists of a second smaller diameter tube which is movably supported in the first tube. At a distance from the first rudder, a stop 40. On the second rudder 25, a stop 40 is fixed. Between this stop 40 and the flange 39 of the first pipe, the biasing means 38 is arranged in the form of a compression spring to force the stirrer arm 9 against the bottom wall 6.
The pressure arm thus presses the stirrer arm 9, which in its attachment to the shaft 8 is pivotally supported about a shaft 42, towards
o U
the bottom wall. The stirrer arm 9 is formed of a resiliently bending rigid material whereby it becomes substantially flat during operation. The agitator arm 9 consists of two sections, one radial section 43 connected to the shaft 8 and one located in the same plane, but slightly in the direction of movement (marked with arrow 45) forwardly deflected outer section 44. against which fertilizer scraped from the bottom is collected as the stirrer arm 9 rotates in the drying chamber. Pockets 46

Claims (4)

  1. An apparatus for drying manure and similar waste products, which apparatus comprises a heating chamber (3) and associated heating apparatus for heating manure in an overlying arrangement and from the heating chamber by means of its bottom wall delimited drying chamber (5). the drying chamber disposed with a stirrer (7) having at least one stirring arm (9) intended to iron over the bottom wall (6) of the drying chamber and the bottom wall (6) being freely supported at its peripheral portion, characterized in that the bottom wall (6) ) on its lower side has evenly spaced radial stiffening elements (15) which are punctually welded to the bottom wall to completely eliminate bulging of the bottom wall (6); and that the stirrer arm (9) is biased against the bottom wall to contact the bottom wall (6) during the operation of the dryer. !
  2. Apparatus according to claim 1, wherein the drying chamber (5) has a circular cross-section in the horizontal plane and the stirrer comprises a shaft centered in the drying chamber coupled to a device (11) for rotating the shaft, wherein the stirring arm (9) is fixed 1 to the shaft, characterized in that the shaft abuts the upper surface of the bottom wall (6) and that a pressure arm (30) extends from a position on the shaft over its lower portion to a place on the stirrer arm (9) away from the shaft, and that a resiliently adjustable biasing member (38) acting on the upper side of the stirring arm is arranged on the pressure arm at a point close to the center portion of the stirring arm.
  3. Apparatus according to Claim 1, characterized in that the bracing elements (15) consist of sheet iron which is placed upright against the bottom surface (6) in a close radial pattern ·.
  4. Apparatus according to one of the preceding claims, characterized in that the bottom wall (6) is supported at the side walls of the dryer by a flange device (12) projecting from the side wall, that radial grooves (13) are removed in the bottom wall by its circumference and the control knobs (14) cooperating with the grooves are arranged on the captive device (12). 30 35
DK093479A 1979-03-06 1979-03-06 Appliances for drying of fertilizers and similar waste products DK152037C (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DK93479 1979-03-06
DK093479A DK152037C (en) 1979-03-06 1979-03-06 Appliances for drying of fertilizers and similar waste products

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DK093479A DK152037C (en) 1979-03-06 1979-03-06 Appliances for drying of fertilizers and similar waste products

Publications (3)

Publication Number Publication Date
DK93479A DK93479A (en) 1980-09-07
DK152037B true DK152037B (en) 1988-01-25
DK152037C DK152037C (en) 1988-12-12

Family

ID=8099169

Family Applications (1)

Application Number Title Priority Date Filing Date
DK093479A DK152037C (en) 1979-03-06 1979-03-06 Appliances for drying of fertilizers and similar waste products

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191506318A (en) * 1915-04-28 1915-09-09 Torrance & Sons Ltd Improvements in and relating to Drying-floors.
GB155493A (en) * 1920-03-11 1920-12-23 Hugh Blackie Lowden Improvement in the method of and apparatus for drying or partially eliminating moisture from materials
FR523816A (en) * 1915-05-11 1921-08-25 Karl Niessen Method and apparatus for cooking and drying organic materials including slaughterhouse waste
DE416780C (en) * 1924-04-06 1925-07-25 Curt Mueller Dr Drying chamber with variable height for foundry purposes
US1822486A (en) * 1926-02-19 1931-09-08 Nat Aniline & Chem Co Inc Drier
GB398628A (en) * 1932-07-25 1933-09-21 Murphy John Automatic kiln drying apparatus
GB781154A (en) * 1955-12-29 1957-08-14 Hermann Orth A two-zone dryer
US3004347A (en) * 1958-12-08 1961-10-17 Sun Oil Co Drying of solid materials

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191506318A (en) * 1915-04-28 1915-09-09 Torrance & Sons Ltd Improvements in and relating to Drying-floors.
FR523816A (en) * 1915-05-11 1921-08-25 Karl Niessen Method and apparatus for cooking and drying organic materials including slaughterhouse waste
GB155493A (en) * 1920-03-11 1920-12-23 Hugh Blackie Lowden Improvement in the method of and apparatus for drying or partially eliminating moisture from materials
DE416780C (en) * 1924-04-06 1925-07-25 Curt Mueller Dr Drying chamber with variable height for foundry purposes
US1822486A (en) * 1926-02-19 1931-09-08 Nat Aniline & Chem Co Inc Drier
GB398628A (en) * 1932-07-25 1933-09-21 Murphy John Automatic kiln drying apparatus
GB781154A (en) * 1955-12-29 1957-08-14 Hermann Orth A two-zone dryer
US3004347A (en) * 1958-12-08 1961-10-17 Sun Oil Co Drying of solid materials

Also Published As

Publication number Publication date
DK93479A (en) 1980-09-07
DK152037C (en) 1988-12-12

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