Rotating Filter Holder Surface Drying for Slurry Separation

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Solution Overview

Problem

Conventional filter devices require a long time for drying the filter cake, resulting in a high energy consumption, as the entire cake is stirred until dry, mixing dry and moist parts and limiting the heating surface.

Innovation Solution

The method involves mechanically pressing the filter cake to remove moisture, heating only the surface until dry, and then removing it, allowing for continuous processing with reduced energy use by targeting heat input to the surface area, and using a rotating filter holder to increase heat efficiency and minimize dead space.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the entire filter cake is stirred until dry using a conventional agitator, then the filter cake is completely dried, but the drying time is long and energy consumption is high

Engineering Contradiction:

Improvedrying completenessVSAvoidenergy consumption

Core Design Contradiction:

ReliabilityVSUse of energy by stationary object

Solution Approach 1:

The filter cake is divided into multiple sections (first section for heating, second section for removal) along the rotational path. Only the surface of the filter cake in the heating section is dried at any given time, rather than stirring the entire cake until completely dry. This segmentation allows continuous processing with reduced energy input.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The filter cake is pre-pressed before entering the heating section to remove excess moisture. This preliminary mechanical dewatering reduces the drying burden in the heating section, allowing surface drying to be achieved more efficiently with less energy consumption.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If the filter cake is stirred continuously until completely dry, then drying is achieved, but dry and moist parts are mixed which delays the overall drying process

Engineering Contradiction:

Improvedrying completenessVSAvoiddrying time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The drying process is segmented into a heating section where surface drying occurs and a removal section where the dried surface is scraped off. This prevents mixing of dry and moist parts that would occur with conventional stirring, as each surface layer is dried and removed in sequence without being redistributed.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The filter holder rotates continuously through the heating section, maintaining constant heat application to the surface. The dried surface is continuously removed by the scraping element, allowing the process to proceed without interruption or mixing cycles, thereby reducing total drying time.

Inventive Principle:

Principle #20Continuity of useful action

3Temperature

If a conventional agitator head is used for drying, then the filter cake can be stirred, but the agitator head size is limited which restricts the heating surface area

Engineering Contradiction:

Improveheating surfaceVSAvoidagitator head size limitation

Core Design Contradiction:

TemperatureVSDevice complexity

Solution Approach 1:

Instead of using a rotating agitator head that contacts the filter cake (conventional approach), the invention uses a stationary heating surface with a rotating filter holder that brings the cake surface into contact with the heater. The scraping element is stationary while the cake rotates past it. This inversion allows much larger heating surface area without increasing agitator head complexity.

Inventive Principle:

Principle #13The other way round (Inversion)

4Reliability

If washing liquid is used extensively to clean the filter cake, then contamination is removed, but large amounts of washing liquid are required

Engineering Contradiction:

Improvecleaning effectivenessVSAvoidwashing liquid volume

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The filter cake is pre-pressed before drying to remove excess moisture and contamination. This preliminary mechanical separation reduces the amount of washing liquid needed subsequently, as the pressing step already removes significant portions of contaminants with minimal liquid usage.

Inventive Principle:

Principle #10Preliminary action

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This approach significantly reduces drying time and energy consumption by focusing heat on the surface of the filter cake, enabling continuous operation and efficient energy use while minimizing the need for extensive washing liquids.

Implementation Method 1

heating only the surface until dry

Methodology Applied

Scientific EffectHeating: Heating

Implementation Method 2

evaporate moisture

Methodology Applied

Scientific EffectEvaporation: Evaporation

Implementation Method 3

mechanically pressing the filter cake to remove moisture

Methodology Applied

Scientific EffectCompression: Compression

Implementation Method 4

rotating filter holder to increase heat efficiency

Methodology Applied

Scientific EffectRotation:

Data Source

PatentEP2729228B1Method to separate particles and liquids from a slurry

Publication Date: 2018.12.26 BRANDOLISIO SERGIO

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AI summary

The invention relates to a device and a method for separating solid materials and liquids of a suspension. The filtering device according to the invention comprises at least one filter holder (9, 13) for receiving a filter medium (8) and at least one heating unit (17), and is characterized in that the filter holder (9, 13) in arranged so as to be movable in the direction of the heating unit (17).