CO2 Recovery Oxygen Reduction via Catalytic Removal
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional CO2 recovery methods face issues with residual oxygen in the recovered CO2 gas, leading to equipment clogging, pipe corrosion, and colored chemical products due to high oxygen concentrations, which require additional energy and costs for reduction.
Innovation Solution
A CO2 recovery apparatus incorporating an oxygen reducing apparatus with a combustion catalyst, such as Pd-based or Pt-based metal catalyst, and a hydrogen-rich gas supply to reduce oxygen levels in the CO2 gas, arranged between compressors and coolers to efficiently decrease oxygen concentrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional CO2 recovery methods are used, then CO2 can be recovered from flue gas, but residual oxygen in the recovered CO2 gas causes equipment clogging, pipe corrosion, and product coloring
Solution Approach 1:
The patent extracts and removes oxygen from the recovered CO2 gas stream using a dedicated oxygen removal unit positioned between the regenerator and compressor. This separation approach isolates the harmful oxygen component from the CO2 product, preventing it from causing equipment clogging, corrosion, and product coloring issues downstream
Solution Approach 2:
The patent introduces an intermediary oxygen removal unit that acts as a mediator between the regenerator and compressor. This unit contains catalysts or chemical agents that selectively react with and remove oxygen from the CO2 gas stream, protecting downstream equipment from oxygen-related damage without affecting the CO2 recovery process
2Object-affected harmful factors
If additional oxygen reduction measures are implemented, then oxygen concentration can be reduced, but energy consumption and operational costs increase
Solution Approach 1:
The patent changes the chemical parameters of the CO2 gas stream by introducing catalysts or chemical agents in the oxygen removal unit that selectively react with oxygen at specific temperature and pressure conditions. This allows for efficient oxygen removal through chemical transformation rather than energy-intensive physical separation methods
Solution Approach 2:
The oxygen removal unit is designed to operate using the existing thermal energy from the regenerator outlet gas, eliminating the need for additional external energy input. The system utilizes the heat already present in the process stream to drive the oxygen removal reaction, making the process self-sufficient and energy-efficient
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
Effectively reduces oxygen concentration in the CO2 gas from several hundred parts per million to less than tens of parts per million, mitigating issues like equipment clogging and product coloring, while optimizing energy usage and reducing operational costs.
Implementation Method 1
A CO2 recovery apparatus incorporating an oxygen reducing apparatus with a combustion catalyst, such as Pd-based or Pt-based metal catalyst
Implementation Method 2
a combustion catalyst that reduces O2 in the CO2 gas
Implementation Method 3
a CO2 absorber that brings flue gas containing CO2 into contact with CO2 absorbing liquid to reduce CO2 in the flue gas
Implementation Method 4
a regenerator that reduces CO2 in rich solvent that has absorbed CO2 in the CO2 absorber
Implementation Method 5
The regenerator 15 reduces CO2 in the CO2 absorbing liquid 14
Implementation Method 6
at least two compressors that compress CO2 gas released from the regenerator
Implementation Method 7
a second cooler that is arranged downstream of the second compressor and upstream of the second separator
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A CO2 recovery apparatus according to a first embodiment of the present invention includes: a CO2 absorber (13) that brings flue gas containing CO2 into contact with CO2 absorbing liquid to reduce CO2 in the flue gas; a regenerator (15) that reduces CO2 in CO2 absorbing liquid (rich solvent) that has absorbed the CO2 in the CO2 absorber (13) to regenerate the CO2 absorbing liquid, so that the regenerated absorbing liquid (lean solvent), having CO2 reduced in the regenerator (15), is reused in the CO2 absorber (13); a first to a fourth compressors (29-1, 29-2, 29-3, 29-4) that compress the CO2 gas released from the regenerator (15); and an O2 reducing apparatus arranged between the second compressor (29-2) and a second cooler (30-2) to reduce O2 in the CO2 gas.