Heat recovery from sorbent-based CO₂capture

摘要

The present invention provides a method of increasing the efficiency of exothermic CO2 capture processes. The method relates to withdrawing heat generated during the exothermic capture of CO2 with various sorbents via heat exchange with a working fluid. The working fluid is provided at a temperature and pressure such that it is in the liquid state, and has a vaporization temperature in a range such that the heat arising from the reaction of the CO2 and the sorbent causes a phase change from liquid to vapor state in whole or in part and transfers heat from to the working fluid. The resulting heated working fluid may subsequently be used to generate power.

主权项

1. A method for increasing energy efficiency of CO2 capture from a fluid stream containing CO2, comprising:
contacting a CO2-containing fluid stream with a sorbent in an adsorber such that the CO2 reacts with the sorbent so that at least a portion of the CO2 is removed from the fluid stream and heat is generated; withdrawing heat from the adsorber via heat exchange with a pressurized, liquid working fluid having a vaporization temperature in a range such that the heat in the adsorber arising from the reaction causes a phase change from liquid to vapor and transfers heat from the adsorber to the working fluid, thus forming a heated, vaporized working fluid.