Moisture reduction press

• US 6,520,073 B1
• Filed: 11/12/1999
• Issued: 02/18/2003
• Est. Priority Date: 03/04/1997
• Status: Expired due to Term

• Current Assignee: J S Maskinfabrik A/S
• Original Assignee: J S Maskinfabrik A/S
• Inventors: Sorensen, Freddy
• Primary Examiner(s): Sipos, John
• Assistant Examiner(s): HUYNH, LOUIS K
• Application Number:
  US09/380,365
• Time in Patent Office: 1,194 Days
• Field of Search: 100/37, 100/110, 100/111, 100/112, 100/116, 100/117, 100/126, 100/127, 100/148
• US Class Current: 100/37
• CPC Class Codes: B01D 29/15 arranged for inward flow filtration
• CPC Class Codes: B01D 29/23 arranged for outward flow filtration
• CPC Class Codes: B01D 29/54 arranged concentrically or coaxially
• CPC Class Codes: B01D 29/828 using screws B01D29/6476 takes precedence
• CPC Class Codes: B01D 29/94 for discharging the filter cake, e.g. chutes
• CPC Class Codes: B01D 33/073 arranged for inward flow filtration
• CPC Class Codes: B01D 33/11 arranged for outward flow filtration
• CPC Class Codes: B01D 33/39 concentrically or coaxially
• CPC Class Codes: B01D 33/466 scrapers
• CPC Class Codes: B01D 33/648 by screws
• CPC Class Codes: B01D 33/76 for discharging the filter cake, e.g. chutes
• CPC Class Codes: B30B 9/12 using pressing worms or screws co-operating with a permeable casing
• CPC Class Codes: B30B 9/125 Control arrangements
• CPC Class Codes: B30B 9/128 Vertical or inclined screw presses
• CPC Class Codes: B30B 9/18 with means for adjusting the outlet for the solid
• CPC Class Codes: B30B 9/26 Permeable casings or strainers

Abstract

Moisture reduction press for the separation of liquid from substances, comprising a first container with an inlet opening through which the substance is fed to an inlet chamber, and with a discharge opening from an outlet chamber through which the moisture-reduced substance leaves the press, and also where inside the first container there is arranged a second container, so that between the surface of the first container and the outer surface of the second container a passageway is formed. The moisture reduction press further comprises means for building up a pressure at least in the passageway and feed the substance forward, and in that the wall of the first container, preferably for the whole of its periphery and at least between the two chambers, is produced with through-going holes. There is hereby achieved a uniform distribution and pressing of the substance to be drained, regardless of the moisture content in the substance. Moreover, the process is effected continuously and without any risk of stoppages taking place.

Claims

1. Moisture reduction press for the draining-off of liquid from substances, comprising a first container, said first container having an inlet opening, an inlet chamber in the first container downstream of the inlet opening, a filter area in the inlet chamber, said filter area being spaced from said first container and said filter area being defined by an outer surface, an outlet chamber in the first container downstream of the inlet chamber and an outlet opening leading from the outlet chamber, the inlet and outlet chambers being in fluid communication, the inlet opening being a position where the substances are added under pressure to the inlet chamber from where the substances are pressed through the filter area to the outlet chamber and the outlet opening, through which liquid reduced drained substance leaves the press, and including a pump which is located upstream of the filter area and a valve/throttle located at the outlet opening, necessary pressure in the press being obtained by means of said pump in combination with said valve/throttle, the press having a substantially constant cross-sectional area of passage for the substance through the press, wherein a scraper arrangement is disposed between said outer surface of the filter area and an inner surface of the first container, the scraper arrangement having scraping being fastened to the inner surface of the first container, said first container being rotatable.

2. The moisture reduction press according to claim 1, wherein the scraper arrangement in the area of passage, the scraper arrangement having scraping elements being movable in relation to at least one of first container and the filter area.

3. Moisture reduction press according to claim 1, in which the scraper arrangement fastened to the outer surface of the filer area, includes further scraping elements and wherein said filter area is rotatable.

4. Moisture reduction press according to claim 1, in which the scraper arrangement is rotatable with scraper surfaces against both the inner surface of the first container and the outer surface of the filter area.

5. Moisture reduction press according to claim 1, in which the scraper arrangement comprises a worm blading located around the outer surface of the filter area.

6. Moisture reduction press according to claim 1, in which the scraper arrangement comprises separate plate pieces mounted on at least one of the outer surface of the filter area and the inner surface of the first container.

7. Moisture reduction press according to claim 1, surrounded, at least in the area after the inlet chamber and before the outlet chamber, with a tight jacket.

8. Method for draining and pressing of a substance, including a moisture reduction press comprising a first container having an inlet opening, an inlet chamber in the first container downstream of the inlet opening, a filter area in the inlet chamber, said filter area being spaced from said first container and said filter area being defined by an outer surface, an outlet chamber in the first container downstream of the inlet chamber and an outlet opening leading from the outlet chamber, the inlet and outlet chambers being in fluid communication, the inlet opening being a position where the substances are added under pressure to the inlet chamber from where the substances are pressed through the filter area to the outlet chamber and the outlet opening, through which liquid reduced drained substance leaves the press, and including a pump which is located upstream of the filter area and a valve/throttle located at the outlet opening, necessary pressure in the press being obtained by means of said pump in combination with said valve/throttle, the press having a substantially constant cross-sectional area of passage for the substance through the press, wherein a scraper arrangement is disposed between said outer surface of the filter area and an inner surface of the first container, the scraper arrangement having scraping elements being fastened to the inner surface of the first container, said first container being rotatable, the method comprising the steps of

leading the substance towards the first container and distributing the substance under the influence of pressure,

adjusting the valve/throttle for establishing a desired pressure obtained by means of said pump measured in the moisture reduction press,

periodically opening and closing the valve/throttle for producing a constant pulsation,

draining the substance of moisture through the filter area under the influence of pressure,

and removing the substance from the container through the outlet opening.