CO2 Capture Liquid Refining With Online Acid Monitoring
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Solution Overview
Problem
Existing carbon dioxide capture systems face inefficiencies due to the accumulation of heat-stable amine salts and corrosion issues caused by impurities in the absorption liquid, which are not effectively addressed by current offline measurement methods of acid component concentration, leading to prolonged downtime and increased maintenance costs.
Innovation Solution
A carbon dioxide capturing system equipped with online measurement apparatuses for pH, electrical conductivity, and carbon dioxide concentration, coupled with an information processing apparatus that calculates acid component concentration in real-time to control an absorption liquid refining apparatus, enabling immediate determination of when to operate the refining process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If offline measurement methods are used to monitor acid component concentration, then device complexity is reduced, but response time is delayed leading to prolonged downtime
Solution Approach 1:
The patent replaces offline laboratory measurement methods with online measurement apparatus that directly measure pH and electrical conductivity in the absorption liquid circulation system. This substitution of measurement methodology enables real-time monitoring without requiring sample extraction and laboratory analysis, thereby reducing downtime while adding minimal system complexity
Solution Approach 2:
The patent implements a feedback control system where online measurement of pH and electrical conductivity continuously monitors acid component concentration, and the information processing apparatus automatically determines when acid component concentration reaches levels requiring absorption liquid refining. This closed-loop feedback eliminates the delay inherent in offline measurement methods
2Productivity
If absorption liquid is circulated continuously between absorber and regenerator, then CO2 capture productivity is improved, but heat-stable amine salt accumulates causing corrosion
Solution Approach 1:
The patent uses online measurement apparatus to continuously monitor pH and electrical conductivity of the absorption liquid, providing real-time feedback on acid component concentration. The information processing apparatus analyzes this data to determine optimal timing for absorption liquid refining, enabling proactive maintenance that prevents corrosion while maintaining continuous CO2 capture operations
Solution Approach 2:
The patent performs absorption liquid refining as a preliminary action before heat-stable amine salt accumulation reaches levels that cause significant corrosion. By monitoring pH and electrical conductivity in real-time, the system identifies when acid component concentration approaches problematic levels and schedules refining operations accordingly, preventing corrosion issues before they arise
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
Enables real-time monitoring and control of the absorption liquid quality, reducing downtime and maintenance costs by promptly removing heat-stable amine salts, thereby maintaining efficient CO2 capture performance.
Implementation Method 1
an absorber that brings a treatment object gas including carbon dioxide and an absorption liquid including an amine-based compound into contact with each other, and that causes the absorption liquid to absorb the carbon dioxide
Implementation Method 2
a regenerator that heats the absorption liquid having absorbed the carbon dioxide, and that causes the carbon dioxide to be released from the absorption liquid
Data Source
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AI summary
In one embodiment, a carbon dioxide capturing system includes an absorber configured to bring a treatment object gas including carbon dioxide and an absorption liquid including an amine-based compound into contact with each other, and cause the absorption liquid to absorb the carbon dioxide, and a regenerator configured to heat the absorption liquid having absorbed the carbon dioxide, and cause the carbon dioxide to be released from the absorption liquid. The system further includes measuring apparatuses for measuring two or more of pH, electrical conductivity, and carbon dioxide concentration of the absorption liquid in a carbon dioxide capturing apparatus that includes the absorber and the regenerator. The system further includes an absorption liquid refining apparatus for refining the absorption liquid, and an information processing apparatus for controlling the absorption liquid refining apparatus, based on two or more of the pH, the conductivity, and the concentration.