MEMBRANE SEPARATION METHODS AND SYSTEM UTILIZING WASTE HEAT FOR ON-BOARD RECOVERY AND STORAGE OF CO2 FROM MOTOR VEHICLE INTERNAL COMBUSTION ENGINE EXHAUST GASES

摘要

A method and system are described for on-board treatment of an exhaust stream containing CO2 emitted by a hydrocarbon-fueled internal combustion engine (ICE) used to power a vehicle in order to reduce the amount of CO2 discharged into the atmosphere which include: a. a first waste heat recovery zone on board the vehicle for receiving the high temperature exhaust gas stream, at least one heat exchanger having an inlet for receiving the hot exhaust gas stream from the ICE for passage in heat exchange relation and a discharge outlet for discharging the exhaust stream at a lower temperature, the heat recovery zone further including at least one heat recovery device for converting the waste heat from the exhaust gas to electrical and/or mechanical energy; b. a membrane separation zone in fluid communication with the exhaust gas stream discharge outlet from the waste heat recovery zone, the membrane separation zone including a membrane module having a permeate side to which CO2 permeates and a retentate side that is contacted by the cooled exhaust gas stream, the retentate side including a treated exhaust gas stream outlet; c. a densification zone in fluid communication with the permeate side of the membrane molecule for receiving permeate CO2, the densification zone including means for reducing the temperature and volume of the CO2 to at least liquefy the CO2, and to produce a treated exhaust gas stream of reduced CO2 content; d. a storage zone for receiving the densified CO2 for temporary storage on board the vehicle; and e. an exhaust gas conduit in fluid communication with the treated exhaust gas stream outlet from the membrane module zone.