Plant and process for producing hydrogen with improved operation of a low temperature CO2 removal unit
AssigneeTopsoe A/S
InventorSteffen Spangsberg Christensen
Life of this patent
Estimating the term…
Abstract
A plant and process for producing a hydrogen rich gas are provided, said process including the steps of: steam reforming a hydrocarbon feed into a synthesis gas; shifting the synthesis gas and conducting the shifted gas to a hydrogen purification unit, subjecting CO2-rich off-gas from the hydrogen purification unit to a carbon dioxide removal in a low temperature CO2-removal section and recycling CO2-depleted off-gas rich in hydrogen to the process. A drying unit upstream the CO2-removal section is provided, under the addition of regeneration gas produced in the plant and process.
Claims30
A plant for producing a hydrogen product from a hydrocarbon feed, said plant comprising:
- a reforming unit, said reforming unit being arranged to receive a hydrocarbon feed and convert it to a syngas stream;
- a shift section being arranged to receive said syngas stream from the steam reforming unit and shift it into a shifted syngas stream;
- a hydrogen purification unit, arranged to receive said shifted syngas stream and separate it into a high-purity H2 stream as said hydrogen product, and a CO2-rich off-gas stream;
- a steam header arranged to receive steam produced by the cooling of:
- said syngas stream and/or said shifted syngas stream;
- a CO2-rich off-gas compressor, arranged to receive and compress said CO2-rich off-gas stream into a compressed CO2-rich off-gas stream;
- a drying unit arranged to receive the compressed CO2-rich off-gas stream and provide a dried compressed CO2-rich off-gas stream;
- said drying unit further being arranged to receive an inlet regeneration gas stream and to withdraw an exit regeneration gas stream;
- said drying unit further comprising:
- a heat exchanging unit arranged to preheat the inlet regeneration gas stream by indirect cooling of a heat exchanging medium selected from any of:
- steam from said steam header, said syngas stream, said shifted syngas stream, a flue gas stream generated in said reforming unit, steam produced by cooling of the flue gas stream and any combination thereof;
- and provide a cooled heat exchanging medium as a steam condensate or as a cooled gas;
- a low temperature CO2-removal section arranged to receive said dried compressed CO2-rich off-gas stream for removal of CO2 from the CO2-rich off-gas stream or from said dried compressed CO2-rich off-gas stream, and provide at least:
- a CO2-product stream and a CO2-depleted off-gas stream.
Dependencies are inferred from the claim text.