Acidic Ozone Scrubber Using Reducing Agents
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Solution Overview
Problem
Current ozone destruction methods, such as thermal and catalytic destructors, are energetically expensive or prone to catalyst poisoning, and existing scrubbing processes with alkaline liquids are inefficient for low ozone concentrations, necessitating a cost-effective and efficient ozone destructor or scrubber.
Innovation Solution
A method using a gas-liquid contactor with an aqueous solution of a reducing agent under acidic pH conditions, where the reducing agent, such as sulphite, bisulphite, or thiosulfate, reacts with ozone to produce an acidic reaction product, maintaining acidic conditions for high ozone destruction yield without the need for heating or catalysts, and an ozone scrubber with recirculation and pH control to optimize ozone destruction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If thermal ozone destructors are used to destroy ozone by heating the gas flow, then ozone destruction efficiency is improved, but energy consumption increases significantly
Solution Approach 1:
The invention changes the chemical parameter (pH) of the scrubbing liquid to acidic conditions (pH 2-4) to optimize the reduction reaction between ozone and the reducing agent. This parameter optimization enables efficient ozone destruction at room temperature without requiring thermal heating, thus resolving the contradiction between destruction efficiency and energy consumption
Solution Approach 2:
The invention replaces the thermal mechanism (heating) with a chemical mechanism (reduction reaction in acidic medium). Instead of using thermal energy to destroy ozone, the system uses chemical reduction by agents such as sulphites, bisulphites, or thiosulfates in acidic conditions, eliminating the need for energy-intensive heating while maintaining high destruction efficiency
2Use of energy by moving object
If catalytic ozone destructors are used to reduce operational costs, then energy consumption decreases, but catalyst poisoning occurs leading to frequent replacements and increased operational costs
Solution Approach 1:
The invention uses inexpensive, readily available reducing agents (sulphites, bisulphites, thiosulfates) that can be continuously supplied in the scrubbing liquid, replacing the need for expensive, sensitive catalysts. These reducing agents are consumed in the reaction but can be easily replenished, avoiding catalyst poisoning issues and frequent replacements
Solution Approach 2:
The invention introduces an acidic medium as an intermediary that enhances the reactivity of the reducing agent toward ozone. The acidic pH conditions act as a mediator that facilitates the reduction reaction, enabling efficient ozone destruction without requiring sensitive catalysts that would otherwise be needed to achieve similar reaction rates
3Device complexity
If alkaline liquid scrubbing is used to destroy ozone, then the process is simple, but the reaction selectivity is low and ozone destruction efficiency is insufficient
Solution Approach 1:
The invention inverts the conventional approach by using acidic pH conditions instead of alkaline conditions for the scrubbing liquid. This inversion fundamentally changes the reaction chemistry, enabling high-selectivity reduction of ozone by sulphite, bisulphite, or thiosulfate ions while minimizing competing reactions, thus achieving both simplicity and high efficiency
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 achieves high ozone destruction efficiency with low reducing agent consumption, reducing operational costs and avoiding catalyst poisoning, while maintaining acidic conditions for continuous ozone destruction and minimizing side reactions.
Implementation Method 1
scrubbing ozone of the inlet gas by a reduction reaction with the reducing liquid under acidic pH conditions
Data Source
AI summary
Method to scrub ozone in an ozone scrubber comprising a gas-liquid contactor adapted to bring a reducing liquid in contact with an inlet gas comprising ozone, the method comprising the steps of:supplying the inlet gas to the gas-liquid contactor,supplying fresh reducing liquid to the gas-liquid contactor, the fresh reducing liquid comprising an aqueous solution of a reducing agent,scrubbing ozone of the inlet gas by a reduction reaction with the reducing liquid under acidic pH conditions.