Mist Trap for Wet Scrubber Exhaust Draw Amplification

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Solution Overview

Problem

Exhaust draw amplification devices in gas abatement systems suffer from unsatisfactory Mean Time Between Cleaning (MTBC) due to powder accumulation on internal surfaces, which reduces device effectiveness and can trigger alarms or automatic shutdowns.

Innovation Solution

A mist-trap is introduced to capture and redirect mist as liquid back towards the wet scrubber, allowing for washing of ductwork and internal surfaces of the exhaust draw amplification device, thereby reducing powder adhesion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If exhaust draw amplification device is used to increase gas flow velocity, then gas stream velocity is improved, but powder accumulates on internal surfaces reducing device effectiveness

Engineering Contradiction:

Improvegas flow velocityVSAvoiddevice effectiveness

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

The mist-trap captures mist droplets before they can settle and dry to form powder deposits on the exhaust draw amplification device surfaces. By removing the liquid component preliminarily, the subsequent gas flow can maintain high velocity without causing powder accumulation that would reduce device effectiveness.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The mist-trap acts as an intermediary device between the wet scrubber and the exhaust draw amplification device. It removes mist droplets from the gas stream, preventing these droplets from drying and forming powder deposits on the EDAD internal surfaces, thus protecting the device while allowing high gas flow velocity to continue.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Speed

If compressed dry air is introduced into exhaust stream to increase velocity, then gas flow velocity is improved, but powder accumulates on jet ports and internal walls

Engineering Contradiction:

Improvegas flow velocityVSAvoidpowder accumulation

Core Design Contradiction:

SpeedVSObject-generated harmful factors

Solution Approach 1:

The invention converts the potentially harmful mist droplets into a beneficial washing fluid. By capturing the mist in the mist-trap and allowing it to drain back through the exhaust draw amplification device, the liquid acts as a cleaning agent that prevents powder accumulation on jet ports and internal walls, transforming a problem into a solution.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The mist-trap recovers the liquid component from the exhaust stream by capturing mist droplets and allowing them to drain. This recovered liquid is then directed back through the exhaust draw amplification device to wash away powder deposits, preventing their accumulation while maintaining high gas flow velocity.

Inventive Principle:

Principle #34Discarding and recovering

3Quantity of substance

If mist filter is used to remove droplets, then gas stream is dried, but powder accumulates to extent triggering alarm or shutdown

Engineering Contradiction:

Improvemist removal efficiencyVSAvoidsystem operation continuity

Core Design Contradiction:

Quantity of substanceVSReliability

Solution Approach 1:

The mist-trap performs preliminary removal of mist droplets from the gas stream before the gas enters the exhaust draw amplification device. This preliminary action prevents the droplets from drying and forming powder deposits that would trigger alarms or cause shutdowns, thereby maintaining system operation continuity while achieving effective mist removal.

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

The mist-trap effectively reduces powder accumulation on internal surfaces of the exhaust draw amplification device, increasing MTBC and maintaining device effectiveness by using the mist to wash away deposits.

Implementation Method 1

a liquid capture surface on which the mist droplets may coalesce to form a liquid

Methodology Applied

Scientific EffectCoalescence: Coagulation

Implementation Method 2

allowing for washing of ductwork and internal surfaces of the exhaust draw amplification device, thereby reducing powder adhesion

Methodology Applied

Scientific EffectWashing/Fluid cleaning: Fluid Spray

Data Source

PatentUS20250196036A1Mist trap

Publication Date: 2025.06.19 EDWARDS LTD

AI summary

This application relates to a mist-trap for a wet-scrubber abatement system. The mist trap comprises a demisting chamber having a gas inlet for receiving mist-laden exhaust gas from the wet-scrubber abatement system, a liquid capture surface on which the mist droplets may coalesce to form a liquid, and a gas outlet through which relatively dry gas may exit the chamber. The mist trap is configured such that at least a first portion of the captured liquid exits the chamber via the gas inlet to return to the wet-scrubber abatement system. The application also relates to a water-collecting baffle, an abatement system, and a method of moderating particulate build-up in a primary flow channel of an exhaust draw amplification device.