Electrostatic Precipitator Cell Drying Using Roaster Hot Air

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Solution Overview

Problem

Existing methods for cleaning electrostatic precipitators in coffee bean roasting systems require a lengthy drying period, which is incompatible with frequent roasting operations in small-scale settings, leading to operational disruptions.

Innovation Solution

A method involving the use of hot air generated by the roasting apparatus to dry electrostatic precipitator cells in situ, while the cells are switched off, reducing the drying time to less than an hour by evaporating moisture without risk of short-circuits.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If the electrostatic precipitator cells are washed with water to clean them, then the cleaning effectiveness is improved, but the drying time increases significantly

Engineering Contradiction:

Improvecleaning effectivenessVSAvoiddrying time

Core Design Contradiction:

Ease of manufactureVSLoss of time

Solution Approach 1:

The invention changes the temperature parameter of the drying environment by introducing hot air into the roasting chamber. This parameter change accelerates the evaporation of water from the washed cells, reducing drying time from several hours to minutes while maintaining cleaning effectiveness

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The roasting chamber is given a dual function: it not only roasts coffee beans but also serves as a drying chamber for the electrostatic precipitator cells. By utilizing the existing heating capability of the roaster, the system avoids adding separate drying equipment, making the solution economical and efficient

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Productivity

If the roaster is used frequently for small batch roasting, then productivity is improved, but the availability of the smoke filter unit decreases due to cleaning requirements

Engineering Contradiction:

Improveroasting frequencyVSAvoidfilter cleaning time

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

The system performs self-maintenance by using its own operational resources (hot air from the roasting process) to clean and dry the filter cells. This self-service approach eliminates the need for external drying equipment and reduces downtime, allowing frequent roasting operations without compromising filter maintenance

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The drying process is integrated into the normal operational cycle of the roaster. Instead of being a separate, time-consuming step, drying occurs during routine operations, ensuring continuous productivity and minimizing interruption to the roasting schedule

Inventive Principle:

Principle #20Continuity of useful 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

Enables rapid cleaning and drying of electrostatic precipitator cells, minimizing operational downtime to less than half an hour, allowing for continuous use of the roasting and filtering systems.

Implementation Method 1

passing hot air through said wet removable cell... while said cell is positioned inside the electrostatic precipitator

Methodology Applied

Scientific EffectEvaporation: Evaporation

Implementation Method 2

passing hot air through said wet removable cell... generated by the coffee beans roasting apparatus

Methodology Applied

Scientific EffectConvection: Convection

Data Source

PatentUS12616234B2Method for drying a smoke filter unit

Publication Date: 2026.05.05 SOCIETE DES PRODUITS NESTLE SA

AI summary

The invention concerns a method for drying at least one cell of the electrostatic precipitator of a smoke treating unit in a system of a coffee beans roasting apparatus and a smoke treating unit, said method comprising the step of passing hot air through said cell, while said cell is positioned inside the electrostatic precipitator and while said cell is switched off.