Liquid filtration apparatus

Patent metadata

Field	Value
Publication number	US-10780375-B2
Application number	US-202016793109-A
Country	US
Kind code	B2
Filing date	Feb 18, 2020
Priority date	Aug 23, 2017
Publication date	Sep 22, 2020
Grant date	Sep 22, 2020

Abstract

A liquid filtration apparatus includes a series of upright filter plates forming a filter plate pack. Filtering spaces are formed in the filter plate pack. The liquid filtration apparatus includes at least one filtering space and a filter chamber that is at least partly limited laterally by a filter media. The at least one filtering space has an elongated bottom discharge opening at a level below the filter chamber. The elongated bottom discharge opening is provided with a first openable and closable hatch arrangement and with a second openable and closable hatch arrangement extending across the elongated bottom discharge opening.

First claim

The invention claimed is:

1. A liquid filtration apparatus comprising:
a series of upright filter plates forming a filter plate pack,
wherein filtering spaces are formed in the filter plate pack,
in at least one filtering space a filter chamber is at least partly limited laterally by a filter media,
said at least one filtering space having an elongated bottom discharge opening at a level below the filter chamber,
the elongated bottom discharge opening is limited by two first opposite side walls, and
the elongated bottom discharge opening is provided with a first openable and closable hatch arrangement extending across the elongated bottom discharge opening and configured to selectively open and close the elongated bottom discharge opening at the first openable and closable hatch arrangement,
a material feeding arrangement configured to feed material into filter chambers of the filter plate pack,
wherein the liquid filtration apparatus comprises a pressure arrangement configured to exert pressure on material fed into said filter chamber of the filter plate pack; and
a flushing fluid feeding arrangement configured to selectively feed flushing fluid into said filtering spaces of the filter plate pack, wherein
said at least one filtering space comprises a flushing fluid drainage channel having an inlet and an outlet so that the inlet of the flushing fluid drainage channel is in the elongated bottom discharge opening of said at least one filtering space and so the outlet of the flushing fluid drainage channel is on the outside of the elongated bottom discharge opening of said at least one filtering space, wherein
the elongated bottom discharge opening is additionally provided with a second openable and closable hatch arrangement extending across the elongated bottom discharge opening at a level below both the inlet of the flushing fluid drainage channel and the filter chamber and configured to selectively open and close the elongated bottom discharge opening at the second openable and closable hatch arrangement, wherein
the first openable and closable hatch arrangement extends across the elongated bottom discharge opening at a level above the inlet of the flushing fluid drainage channel; and
a steering arrangement configured to operate the first openable and closable hatch arrangement, the second openable and closable hatch arrangement, the material feeding arrangement, the pressure arrangement, and the flushing fluid feeding arrangement.

2. The liquid filtration apparatus according to claim 1 , wherein
the steering arrangement being configured to in a flush stage of the filter plate pack
(i) open the elongated bottom discharge opening at the first openable and closable hatch arrangement by means of the first openable and closable hatch arrangement to allow flushing fluid to flow past the first openable and closable hatch arrangement, and
(ii) close the elongated bottom discharge opening at the second openable and closable hatch arrangement to prevent flushing fluid from flowing past the second openable and closable hatch arrangement and to cause flushing fluid to flow into the flushing fluid drainage channel.

3. The liquid filtration apparatus according to claim 2 , wherein
the steering arrangement being configured to open the elongated bottom discharge opening at the first openable and closable hatch arrangement to operate the flushing fluid feeding arrangement to fill the filter chamber with flushing fluid.

4. The liquid filtration apparatus according to claim 1 , wherein
the steering arrangement being configured to perform a filling stage to close the elongated bottom discharge opening at the first openable and closable hatch arrangement to prevent material from flowing past the first openable and closable hatch arrangement.

5. The liquid filtration apparatus according to claim 4 , wherein
the steering arrangement being configured to close the elongated bottom discharge opening at the first openable and closable hatch arrangement prior to performing the filtration stage to firstly close the elongated bottom discharge opening at the second openable and closable hatch arrangement, and subsequently to fill flushing fluid into the filtering space so that an upper level of the flushing fluid is at the level of the first openable and closable hatch arrangement.

6. The liquid filtration apparatus according to claim 1 , wherein
the steering arrangement being configured to during a discharge stage of the filter plate pack to open the elongated bottom discharge opening at the first openable and closable hatch arrangement and to open the elongated bottom discharge opening at the second openable and closable hatch arrangement to allow filter cake to fall by gravity out of the elongated bottom discharge opening.

7. The liquid filtration apparatus according to claim 6 , wherein
the steering arrangement being configured to during a discharge stage of the filter plate pack
(i) firstly to open the elongated bottom discharge opening at the second openable and closable hatch arrangement, while keeping the elongated bottom discharge opening closed at the first openable and closable hatch arrangement
(ii) subsequently to open the elongated bottom discharge opening at the first openable and closable hatch arrangement to allow the filter cake to fall by gravity out of the elongated bottom discharge opening.

8. The liquid filtration apparatus according to claim 6 , wherein
the steering arrangement being configured to during a discharge stage of the filter pla pack
(iii) firstly to open the elongated bottom discharge opening at the first openable and closable hatch arrangement, while keeping the elongated bottom discharge opening closed at the second openable and closable hatch arrangement to allow the filter cake to fall by gravity into a space between the first openable and closable hatch arrangement and the second openable and closable hatch arrangement,
(iv) subsequently to close the elongated bottom discharge opening at the first openable and closable hatch arrangement,
(v) subsequently to open the elongated bottom discharge opening at the second openable and closable hatch arrangement to allow the filter cake to fall by gravity out of the elongated bottom discharge opening.

9. The liquid filtration apparatus according to claim 1 , wherein
the first openable and closable hatch arrangement being in the elongate bottom discharge opening arranged at least partly in a first recess in one of the first opposite side walls of the elongate bottom discharge opening.

10. The liquid filtration apparatus according to claim 1 , wherein
the first openable and closable hatch arrangement comprising a first inflatable and deflatable hose seal.

11. The liquid filtration apparatus according to claim 10 , wherein
the first inflatable and deflatable hose seal being fastened at one of the first opposite side walls of the elongate bottom discharge opening so that the first inflatable and deflatable hose seal is in a deflated state configured to be at the said one of the first opposite side walls of the elongate bottom discharge opening and so the first inflatable and deflatable hose seal is in an inflated state configured to extend between the first opposite side walls of the elongate bottom discharge opening.

12. The liquid filtration apparatus according to claim 10 , wherein
a first support member in or at the first inflatable and deflatable hose seal.

13. The liquid filtration apparatus according to claim 10 , wherein
the first inflatable and deflatable hose seal being fastened in the elongated bottom discharge opening by opposite ends of the first infl

Assignees

• Outotec Finland Oy

Inventors

• Böhnke Bernd
• Vänttinen Kari
• Eronen Saku

Classifications

• F16J15/028

  the packing being mechanically expanded against the sealing surface · CPC title

• B01D25/322

  specially for chamber filter presses · CPC title

• B01D25/164 Primary

  Chamber-plate presses, i.e. the sides of the filtering elements being clamped between two successive filtering plates (B01D25/127, B01D25/172, B01D25/176, B01D25/19 take precedence) · CPC title

• B01D2201/342

  Axial sealings · CPC title