Conveyance Gas Composition Modification for IGCC Feedstock
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Solution Overview
Problem
Integrated gasification combined cycle (IGCC) power plants face limitations in using conveyance gas due to pressure constraints and undesirable gas accumulation, particularly with carbon dioxide, which affects the efficiency of feedstock conveyance and syngas processing.
Innovation Solution
Capturing carbon dioxide from untreated syngas and modifying the gas stream by adding carbon monoxide, hydrogen, or hydrogen sulfide to create a conveyance gas with a lower partial pressure of carbon dioxide, suitable for use in the gasifier feed system, thereby overcoming pressure limitations and gas accumulation issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If carbon dioxide is used as conveyance gas in the feed system, then the gas is readily available and can convey feedstock into the gasifier, but the partial pressure of carbon dioxide may exceed critical pressure causing gas accumulation and system limitations
Solution Approach 1:
The patent modifies the composition of the carbon dioxide stream by adding carbon monoxide, hydrogen, and/or hydrogen sulfide to change the partial pressure parameter of carbon dioxide. This compositional parameter change allows the system to operate below the critical pressure threshold while maintaining adequate conveyance gas availability.
Solution Approach 2:
The patent creates a composite conveyance gas mixture by combining carbon dioxide with other gases (carbon monoxide, hydrogen, hydrogen sulfide) that are present in the syngas stream. This composite gas mixture achieves the desired pressure characteristics while maintaining the necessary conveyance functionality.
2Ease of manufacture
If pure carbon dioxide stream is used for conveyance, then the gas composition is simple and easy to control, but it leads to undesirable gas accumulation in the system
Solution Approach 1:
The patent changes the compositional parameters of the conveyance gas by incorporating multiple gas components from the syngas stream. This modification prevents gas accumulation by ensuring the partial pressure of carbon dioxide remains below critical levels, thereby eliminating the harmful effect while maintaining processability.
3Object-generated harmful factors
If carbon dioxide partial pressure is reduced below critical pressure, then gas accumulation is prevented, but the conveyance gas composition becomes more complex requiring modification processes
Solution Approach 1:
The patent utilizes the existing syngas stream components (carbon monoxide, hydrogen, hydrogen sulfide) that are already present in the system to modify the carbon dioxide stream. This self-service approach prevents gas accumulation while avoiding the need for external gas sources or complex external modification processes, as the modifying gases are readily available from the gasifier output.
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 efficient conveyance of feedstock and syngas processing by ensuring the carbon dioxide stream operates below critical pressure, preventing accumulation and enhancing the overall efficiency of the IGCC system.
Implementation Method 1
modifying the composition of the carbon dioxide stream to decrease the partial pressure of carbon dioxide so that the partial pressure is lower than a critical pressure of carbon dioxide
Data Source
AI summary
A method is provided that includes removing carbon dioxide from untreated syngas received from a gasifier to produce a gas stream comprising carbon dioxide, modifying the gas stream by adding carbon monoxide, hydrogen, hydrogen sulfide, or any combination thereof, and providing the gas stream from an acid gas remover to a feed system for use as a conveyance gas to convey a feedstock into the gasifier. Systems implementing these and other methods are also provided.