Hydrogen Peroxide Decomposition Device for Resin Protection

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Solution Overview

Problem

The deterioration of cation exchange resins due to hydrogen peroxide in chemical decontamination processes leads to decreased decontamination efficiency and increased costs, as hydrogen peroxide from two main sources passes through the cation exchange resin, causing resin deterioration.

Innovation Solution

Incorporating a hydrogen peroxide decomposition device between the reactor and the cation exchange resin tower to decompose hydrogen peroxide before it reaches the resin, thereby preventing resin deterioration and optimizing decontamination efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If chemical decontamination is performed using reduction decontamination solution containing hydrogen peroxide, then decontamination efficiency is improved, but cation exchange resin deteriorates and decontamination cost increases

Engineering Contradiction:

Improvedecontamination efficiencyVSAvoidcation exchange resin durability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The decontamination system is segmented into distinct functional units: a reduction decontamination unit that generates hydrogen peroxide for effective decontamination, and a separate hydrogen peroxide decomposition unit that removes hydrogen peroxide before the solution reaches the cation exchange resin. This segmentation allows each unit to optimize its function without interfering with others, maintaining decontamination efficiency while protecting the resin.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

A hydrogen peroxide decomposition catalyst acts as an intermediary between the reduction decontamination solution and the cation exchange resin. This intermediary component decomposes hydrogen peroxide into water and oxygen, eliminating the harmful substance that would otherwise deteriorate the resin while allowing the decontamination process to proceed effectively.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Quantity of substance

If cation exchange resin is used to remove metal ions from decontamination solution, then metal ion removal is achieved, but resin deterioration occurs due to hydrogen peroxide

Engineering Contradiction:

Improvemetal ion removal efficiencyVSAvoidhydrogen peroxide damage to resin

Core Design Contradiction:

Quantity of substanceVSObject-affected harmful factors

Solution Approach 1:

The hydrogen peroxide decomposition unit is positioned upstream of the cation exchange resin, performing preliminary decomposition of hydrogen peroxide before the solution contacts the resin. This preliminary action eliminates the harmful factor (hydrogen peroxide) that would cause resin deterioration, allowing the resin to function efficiently for metal ion removal without damage.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The hydrogen peroxide decomposition catalyst serves as an intermediary that protects the cation exchange resin from hydrogen peroxide damage. By decomposing hydrogen peroxide in the decontamination solution before it reaches the resin, this intermediary component enables the resin to perform metal ion removal without suffering from oxidative deterioration.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Productivity

If hydrogen peroxide is added to decomposition decontamination solution, then decontamination performance is enhanced, but resin life is reduced

Engineering Contradiction:

Improvedecontamination performanceVSAvoidresin service life

Core Design Contradiction:

ProductivityVSDuration of action of stationary object

Solution Approach 1:

The system is divided into a decontamination function segment that utilizes hydrogen peroxide for enhanced performance and a protection segment that removes hydrogen peroxide to preserve resin life. This segmentation allows the full benefits of hydrogen peroxide addition to be realized while the resin is protected from its deteriorating effects through the separate decomposition unit positioned downstream.

Inventive Principle:

Principle #1Segmentation

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 implementation of the hydrogen peroxide decomposition device significantly reduces hydrogen peroxide concentrations, preventing cation exchange resin deterioration and enabling efficient, cost-effective chemical decontamination in a shorter time.

Implementation Method 1

a hydrogen peroxide decomposition step of decomposing hydrogen peroxide contained in the reduction decontamination solution

Methodology Applied

Scientific EffectDecomposition: Decomposition (biological)

Implementation Method 2

a metal ion removing step of removing a metal ion contained in the reduction decontamination solution after the hydrogen peroxide decomposition step

Methodology Applied

Scientific EffectIon exchange: Ion Exchange

Data Source

PatentUS12283386B2Chemical decontamination method and chemical decontamination apparatus

Publication Date: 2025.04.22 HITACHI GE NUCLEAR ENERGY LTD

AI summary

Provided are a chemical decontamination method and a chemical decontamination apparatus capable of preventing deterioration of a metal ion exchange resin and performing decontamination at a low cost in a short time.The chemical decontamination method of the invention includes: a reduction decontamination step of supplying a reduction decontamination solution to a decontamination target portion and performing reduction decontamination on a surface of a member constituting the decontamination target portion; a hydrogen peroxide decomposition step of decomposing hydrogen peroxide contained in the reduction decontamination solution after the reduction decontamination step; and a metal ion removing step of removing a metal ion contained in the reduction decontamination solution after the hydrogen peroxide decomposition step.