SO2 Removal Process Using H2O2 Spray and Aerosol Filter
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Solution Overview
Problem
Existing processes for removing SO2 from off-gases require both an absorption tower and a low velocity aerosol filter due to inefficiencies in removing fine acid mist, which increases installation costs and complexity.
Innovation Solution
Spraying a solution of H2O2 in water or dilute sulphuric acid into the off-gas upstream of a low velocity aerosol filter or wet electrostatic precipitator, allowing the reaction between SO2 and H2O2 to occur in the gas phase and on filter elements, eliminating the need for an absorption tower.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If an absorption tower with circulating sulphuric acid solution containing H2O2 is used to remove SO2, then SO2 can be dissolved and oxidised to H2SO4, but fine acid mist is not removed efficiently and additional low velocity mist filter is required
Solution Approach 1:
The invention combines the SO2 absorption function and the acid mist removal function into a single absorption tower by equipping it with a low velocity aerosol filter. This integration eliminates the need for a separate mist filter while maintaining both SO2 removal efficiency and acid mist control, directly resolving the technical contradiction between substance removal effectiveness and device complexity
Solution Approach 2:
The absorption tower is designed to perform multiple functions simultaneously: it absorbs SO2 from the off-gas, oxidizes it to H2SO4, and through the integrated low velocity aerosol filter, removes fine acid mist. This multi-functionality reduces the total number of equipment units needed while maintaining effective performance in both gas cleaning and aerosol removal
2Quantity of substance
If absorption tower is used to remove SO2, then SO2 conversion to H2SO4 is achieved, but fine acid mist is formed and requires additional mist filter
Solution Approach 1:
The invention converts the harmful fine acid mist byproduct into a beneficial outcome by using the low velocity aerosol filter to capture it, allowing the acid mist to be condensed and collected as additional H2SO4 product rather than being emitted as pollution, thus transforming a harmful effect into a useful resource
Solution Approach 2:
The low velocity aerosol filter acts as an intermediary component within the absorption tower that mediates between the SO2 oxidation process and the final gas outlet. It captures the fine acid mist generated during oxidation, preventing its direct emission while allowing the main gas flow to pass through, thus resolving the contradiction between SO2 conversion and acid mist formation
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 method achieves up to 98% SO2 removal with 95% utilization of H2O2, reducing installation requirements and efficiently managing acid mist emissions, while cooling the off-gas and producing a high concentration of H2SO4.
Implementation Method 1
SO2 is dissolved and oxidised to H2SO4 in the solution
Implementation Method 2
H2O2+SO2=H2SO4
Implementation Method 3
H2O2 vaporised from the absorbing liquid
Implementation Method 4
under formation of sulphuric acid aerosol
Implementation Method 5
the water comprised in the solution cools off the off-gas in line 2 by evaporation of the droplets
Implementation Method 6
remaining SO2 is absorbed and reacts with remaining H2O2 contained in the dilute sulphuric acid wetting the fibre material
Data Source
AI summary
A process for removal of SO2 in off-gases having a temperature of 30-150° C. and containing 0.001-1 vol % SO2 in which the SO2 is oxidised to H2 SO4 by spraying an aqueous solution of H2O2 into the off-gas upstream of an aerosol filter removing the produced sulphuric acid from the off-gas.