Arrangement and method for controlling pressure filter

Patent metadata

Field	Value
Publication number	US-2023398472-A1
Application number	US-202118249859-A
Country	US
Kind code	A1
Filing date	Oct 29, 2021
Priority date	Oct 30, 2020
Publication date	Dec 14, 2023
Grant date	—

Abstract

Disclosed is an arrangement and method for controlling a pressure filter. The arrangement comprises the pressure filter for solid-liquid separation for producing a filter cake and a moisture analyzer for providing an indication of moisture content of the filter cake. One or more controllers may be used for utilizing the indication of moisture content to set a drying time for the solid-liquid separation.

First claim

1 . An arrangement for controlling a pressure filter, the arrangement comprising:
the pressure filter for solid-liquid separation for producing a filter cake; a moisture analyzer for providing an indication of moisture content of the filter cake; one or more controllers for utilizing the indication of moisture content to set a drying time for the solid-liquid separation.

2 . The arrangement according to claim 1 , wherein the moisture analyzer comprises a microwave analyzer, a capacitive sensor or a near-infrared sensor.

3 . The arrangement according to claim 1 , arranged for setting the drying time utilizing indications of moisture content provided from more than one solid-liquid separation cycles of the pressure filter.

4 . The arrangement according to claim 1 , wherein the one or more controllers comprise a multivariable controller.

5 . The arrangement according to claim 1 , wherein the one or more controllers comprise a multivariable MPC (model predictive control) controller.

6 . The arrangement according to claim 1 , arranged for additionally utilizing the indication of moisture content to set a pressing amount of the pressure filter.

7 . The arrangement according to claim 1 , comprising one or more weight sensors for providing an indication of the weight of the filter cake.

8 . The arrangement according to claim 1 , wherein the pressure filter comprises one or more load cells for providing an indication of the weight of the filter cake.

9 . The arrangement according to claim 7 , arranged for additionally utilizing the indication of weight to set a feed amount for the pressure filter.

10 . The arrangement according to claim 1 , arranged for simultaneously utilizing the indication of moisture content and an indication of operating capacity of the pressure filter for setting the drying time and, optionally, a feed amount for the pressure filter and/or a pressing amount of the pressure filter.

11 . The arrangement according to claim 1 , wherein the solid-liquid separation comprises a washing phase and the arrangement comprises one or more sensors for providing an indication of quality of the washing phase for setting the drying time and/or a control value for washing the filter cake.

12 . The arrangement according to claim 1 , comprising one or more sensors for providing an indication of pH, electrical conductivity or turbidity of a filtrate produced by the pressure filter for setting the drying time and/or a control value for washing the filter cake.

13 . A method for controlling a pressure filter for solid-liquid separation, the method comprising:
receiving an indication of moisture content of a filter cake produced by the pressure filter for the solid-liquid separation; and utilizing the indication of the moisture content for setting a drying time for the solid-liquid separation.

14 . The method according to claim 13 , comprising receiving an indication weight of the filter cake; wherein the indication of weight is utilized together with the indication of the moisture content for setting the drying time, a feed amount for the pressure filter and, optionally, a pressing amount of the pressure filter.

15 . A controller configured to cause the method of claim 13 to be carried out.

16 . The arrangement according to claim 8 , arranged for additionally utilizing the indication of weight to set a feed amount for the pressure filter.

Assignees

• Metso Outotec Finland Oy

Inventors

• Pulli Mikko
• Tanttu Leena
• Kosonen Mika
• Kauvosaari Sakari

Classifications

• B01D25/285 Primary

  by compression using inflatable membranes · CPC title

• B01D25/164

  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

• B01D29/82

  by compression · CPC title

• G01N27/223

  for determining moisture content, e.g. humidity (rain detectors on vehicle windows B60S1/0825) · CPC title

• B01D25/12 Primary

  Filter presses, i.e. of the plate or plate and frame type · CPC title