Multi-Stage Air Filter with Additive Injection
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Solution Overview
Problem
Existing air filter systems face challenges with contamination of additives by solids from exhaust airflows, leading to partial recycling issues and increased costs due to the need for complex explosion protection measures, which can result in reduced performance and higher maintenance frequencies.
Innovation Solution
A multi-stage filter system with a primary filter for dust separation, an ignition source preventer to prevent sparks and flames, and a secondary filter using an additive to bind pollutants, where the additive is only added when the dust concentration is low, eliminating the risk of explosions and allowing for recycling of the additive.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If additive is applied directly to filter material, then pollutant binding is achieved, but additive becomes contaminated with solids and can only be partially recycled
Solution Approach 1:
The filter system is divided into two distinct stages: a first filter for dust/solid separation and a second filter for pollutant binding. The additive is applied only in the second filter stage, keeping it separate from the dust-laden air flow in the first stage. This segmentation prevents contamination of the additive with solids while maintaining its pollutant binding function.
2Reliability
If combustible additive is used, then pollutant binding efficiency is improved, but explosion and fire protection costs increase significantly
Solution Approach 1:
The air flow cleaning process is segmented into two stages: first removing dust and solids, then binding pollutants with additive. This segmentation eliminates the need for complex explosion protection because the additive is never exposed to dust-laden air, removing the explosion hazard while maintaining pollutant binding efficiency.
Solution Approach 2:
Dust and solids are removed from the air flow before the additive is introduced. This preliminary action of dust separation creates a safe environment for additive application, eliminating the need for expensive explosion protection measures while preserving the additive's pollutant binding capability.
3Loss of substance
If filter is backwashed for additive cleaning, then additive can be reused, but system performance is reduced and control complexity increases
Solution Approach 1:
The filter system is segmented into two independent filter stages with different functions. The first filter handles dust collection and can be backwashed, while the second filter contains the additive for pollutant binding. This segmentation allows the additive-containing second filter to avoid backwashing, preserving additive quality and simplifying control requirements.
4Reliability
If offline cleaning is performed to prevent explosion, then ignition sources are avoided, but filter system performance is reduced
Solution Approach 1:
The system is segmented so that dust separation and additive application occur in separate stages. The additive is applied in the second stage after dust removal, creating an inherently safe operating condition that eliminates explosion risk without requiring offline cleaning. The system maintains full performance continuously.
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 configuration reduces the risk of explosions, minimizes additive consumption, and lowers operational costs by avoiding the need for expensive explosion protection measures while maintaining high system performance and reducing maintenance needs.
Implementation Method 1
a primary filter (2) through which the air flow flows first, for separating dust and/or solids
Implementation Method 2
an ignition source preventer downstream of the primary filter, for example in the form of a spark separator and/or a flame arrester
Implementation Method 3
an ignition source preventer downstream of the primary filter, for example in the form of a spark separator and/or a flame arrester
Implementation Method 4
a secondary filter (4) downstream of the ignition source preventer, which is prepared for separating pollutants, for example of the type of odorous substances or volatile organic compounds, using an additive that is prepared to bind pollutants to itself
Implementation Method 5
a secondary filter (4) downstream of the ignition source preventer, which is prepared for separating pollutants, for example of the type of odorous substances or volatile organic compounds, using an additive that is prepared to bind pollutants to itself
Data Source
Figure 1
AI summary
The invention relates to a filter system (1) for cleaning an airflow loaded with dust, solids and/or pollutants, comprising a primary filter (2) through which the airflow first flows and which is designed to separate dust and/or solids, an ignition source preventer (3) downstream of the primary filter (2), and a secondary filter (4) downstream of the ignition source preventer (3) which is designed to separate pollutants using an additive prepared to bind the pollutants, wherein an additive addition device (5) is arranged between the ignition source preventer (3) and the secondary filter (4).The invention further relates to a method for cleaning an air stream, wherein a raw gas is filtered into a clean gas in a multi-stage filter process, wherein dust and solids are first separated by a primary filter (2), then potentially occurring sparks and/or flames are separated by an ignition source preventer (3) downstream of the primary filter (2), and subsequently pollutants are separated by a secondary filter (4) downstream of the ignition source preventer (3) using an additive which is prepared to bind the pollutants, wherein an additive is added at an additive addition device (5) between the ignition source preventer (3) and the secondary filter (4), which is filtered out of the air stream in the secondary filter (4).