Integrated Hydrogen Production and CO2 Capture Process
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Solution Overview
Problem
Current hydrogen production facilities face challenges in efficiently capturing CO2 emissions and treating condensates containing impurities, particularly methanol, which complicates wastewater treatment and increases costs.
Innovation Solution
A process integrating CO2 capture with hydrogen production via steam reforming, using pressure swing adsorption and cryogenic CO2 capture, and treating condensates from both processes together to recycle impurities and reduce wastewater treatment costs by using steam stripping and recycling condensates within the hydrogen production cycle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If CO2 capture and condensate treatment are handled as separate processes, then each process can be optimized independently, but the overall system complexity and operational costs increase
Solution Approach 1:
The patent combines CO2 capture and condensate treatment into a single integrated unit. The CO2 capture unit processes both the synthesis gas from hydrogen production and the condensates containing dissolved CO2 and impurities like methanol through a unified sequence: compression, water washing, chemical absorption, and thermal regeneration. This merging reduces overall system complexity while maintaining capture efficiency.
Solution Approach 2:
The integrated unit performs multiple functions simultaneously: it captures CO2 from synthesis gas, treats condensates by removing impurities like methanol, and regenerates the absorption solvent. The same equipment (compressor, washer, absorber, stripper) handles both CO2 capture and condensate treatment, making the system multi-functional and reducing the need for separate dedicated equipment.
2Reliability
If condensates are treated separately with specialized equipment, then treatment effectiveness improves, but capital and operational costs increase
Solution Approach 1:
The patent integrates condensate treatment equipment with CO2 capture equipment. The water washer, absorber, and stripper are used for both CO2 removal from gas streams and impurity removal from condensates. This eliminates the need for separate specialized treatment equipment, reducing capital costs while maintaining treatment effectiveness.
Solution Approach 2:
The absorption solvent performs dual functions: capturing CO2 from synthesis gas and removing impurities like methanol from condensates. The same solvent circulation system and regeneration equipment handle both treatment objectives, reducing overall system cost while achieving effective condensate treatment.
3Reliability
If multiple separate treatment processes are used for CO2 capture and condensate treatment, then each process can be optimized, but energy consumption and operational costs increase
Solution Approach 1:
The integrated unit operates continuously with the absorption solvent circulating through absorption and regeneration cycles. The heat from the exothermic absorption process is utilized in the thermal regeneration step, and the continuous operation eliminates the need for separate batch treatment processes, reducing overall energy consumption while maintaining effective emissions reduction.
Solution Approach 2:
The patent converts the heat generated during CO2 absorption (which would be waste heat) into a useful resource for driving the thermal regeneration of the absorption solvent. The exothermic absorption process provides the thermal energy needed for stripper operation, reducing external energy requirements and lowering operational costs while maintaining effective CO2 capture and emissions reduction.
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
This integrated process enhances CO2 capture efficiency, reduces emissions, decreases wastewater treatment complexity, and lowers operational costs by recycling impurities and condensates within the hydrogen production facility.
Implementation Method 1
the synthesis gas is cooled, enriched with H2 and CO2 by converting CO with steam (shift reaction); the enriched synthesis gas is cooled by indirect heat exchange with fluids from the process
Implementation Method 2
the process condensates are treated by steam stripping in a column called a stripper
Implementation Method 3
demineralized water is vaporized, then the vapor is heated, as appropriate superheated
Implementation Method 4
the vapor is heated, as appropriate superheated, by heat exchange with hot fluids from the process
Implementation Method 5
the saturated synthesis gas being treated by pressure swing adsorption so as to produce hydrogen and an offgas containing CO2
Implementation Method 6
enriched with H2 and CO2 by converting CO with steam (shift reaction)
Data Source
AI summary
A method for producing hydrogen by reforming hydrocarbons using steam, combined with carbon dioxide capture and steam production, which involves mixing the hydrocarbons to be reformed with steam in order to produce the feedstock for the reforming, generating a syngas; the syngas is then cooled, and enriched with H2 and CO2; and then cooled. The condensates of the method are separated from the syngas in order to be used in the method, the saturated syngas being treated by adsorption with pressure modulation so as to produce hydrogen and a gaseous effluent containing CO2 that is captured in a CO2-purifying unit. The condensates from the cooling of the syngas at the outlet of the shift reactor are used in the method for producing highly pure steam supplying the mixing point and for exportation; the CPU also produces CPU condensates that are recycled to be treated jointly with the condensates of the method.