System for capturing of co2 from process gas

A system for capturing CO2 from a process gas, the system comprising

• a first reactor arranged to receive a stream of process gas and a particulate sorbent material comprising calcium oxide able to capture the CO2 present in the process gas such that calcium carbonate is formed, the first reactor comprising means for discharging CO2 depleted process gas, a first portion of particulate sorbent material having captured CO2, and a second portion of particulate sorbent material having captured CO2,
• a second reactor arranged to receive the first portion of particulate sorbent material from the first reactor, the second reactor comprising heating means arranged to cause release of CO2 from the particulate sorbent material by decarbonation of the calcium carbonate to form calcium oxide, the second reactor further comprising means for returning the first portion of particulate sorbent material to the first reactor and means for discharging a CO2 rich gas stream, and
• a third reactor arranged to receive the second portion of particulate sorbent material from the first reactor, the third reactor comprising means for supplying water to the second portion of particulate sorbent material to hydrate at least a part of a remaining portion of calcium oxide of the second portion of particulate sorbent material to form calcium hydroxide, the third reactor further comprising means for returning the second portion of particulate sorbent material to the first reactor.