Acetic Acid Cleaning for Nuclear Condenser Scale
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Solution Overview
Problem
Thermal power plants face significant efficiency losses and increased costs due to condenser fouling from mineral scale buildup, which is exacerbated in nuclear power plants where conventional descaling agents are not compatible with radiation exposure and environmental concerns.
Innovation Solution
A method using a mixture of water and acetic acid, with optional additives like oxalic acid and ethoxylated amines, is pumped through the condenser to effectively dissolve calcium carbonate scale, maintaining a pH range that enhances descaling efficiency and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If hydrochloric acid or hydrofluoric acid is used for condenser cleaning, then scale removal effectiveness is improved, but corrosion damage to multimetal components increases and cost increases
Solution Approach 1:
The patent changes the chemical parameters of the cleaning solution by using organic acids (acetic acid at 5-20 wt%, formic acid at 5-20 wt%, or propionic acid at 5-20 wt%) instead of conventional strong mineral acids. This parameter change maintains effective scale removal while reducing corrosion damage to multimetal condenser components, directly resolving the technical contradiction between cleaning effectiveness and corrosion prevention
Solution Approach 2:
The patent employs readily available organic acids that are less expensive than hydrofluoric acid and cause minimal corrosion, effectively treating the cleaning solution as a disposable, low-cost alternative that eliminates the need for expensive corrosion-inhibitor additives while maintaining cleaning effectiveness
2Manufacturing precision
If conventional descaling agents are used in nuclear power plants, then scale removal is achieved, but compatibility with radiation exposure and environmental safety deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters by selecting organic acids with molecular structures that are resistant to radiation degradation and environmentally benign. These organic acids maintain their cleaning effectiveness under radiation exposure while being safe for environmental discharge, resolving the contradiction between scale removal and radiation/environmental compatibility
Solution Approach 2:
The patent creates a chemically inert cleaning environment by using organic acids that do not react with radiation-exposed materials or contaminate the environment, effectively treating the cleaning solution as a radiation-resistant and environmentally inert substance suitable for nuclear power plant operations
3Loss of energy
If condenser tubes are fouled with mineral scale, then heat transfer efficiency decreases, but cleaning cost and plant downtime increase
Solution Approach 1:
The patent applies preliminary chemical treatment by circulating organic acid solutions through the condenser system before major fouling occurs or at scheduled maintenance intervals. This preliminary action prevents severe scale buildup that would require extensive cleaning downtime, maintaining heat transfer efficiency while minimizing plant outage time
Solution Approach 2:
The patent enables continuous or near-continuous cleaning operation by using organic acids that can be circulated through the condenser system without requiring complete shutdown. The cleaning process can be performed while the plant is partially operational or during brief maintenance windows, maintaining continuous heat transfer efficiency and minimizing downtime losses
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 method significantly improves condenser efficiency by effectively removing scale deposits without causing corrosion, is environmentally inert, and suitable for nuclear power plants, reducing fuel consumption and downtime.
Implementation Method 1
pumping the mixture through the offline condenser so as to contact the deposited calcium carbonate with the acetic acid
Data Source
AI summary
Methods for reducing an amount of calcium carbonate deposited on a surface of an offline condenser in a cooling system of a nuclear power plant, which include filling the offline condenser with a mixture comprising water and acetic acid and pumping the mixture through the offline condenser so as to contact the deposited calcium carbonate with the acetic acid. An amount of the acetic acid in the mixture is 1 to 25 wt %, and a temperature of the mixture is in a range of 10 to 50° C.