Chemical looping syngas production from carbonaceous fuels

A system for converting a fuel, the system comprising:

• a first moving bed reactor comprising a metal oxide particles having a primary component and a secondary component, wherein fuel, CO2 and steam are added to the first moving bed reactor in a co-current flow pattern relative to the metal oxide particles, wherein the first moving bed reactor is configured to reduce at least a portion of the metal oxide particles with the fuel to produce a first reduced metal oxide, and is further configured to produce a first syngas stream comprising H2, CO, CO2 and steam;
• a second moving bed reactor, operating in parallel with the first moving bed reactor and comprising metal oxide particles having a primary component and a secondary component, wherein fuel, CO2 and steam are added to the second moving bed reactor in a co-current flow pattern relative to the metal oxide particles, wherein the second moving bed reactor is configured to reduce at least a portion of the metal oxide particles with the fuel to produce a second reduced metal oxide, and is further configured to produce a second syngas stream comprising H2, CO, CO2 and steam;
• a separation unit, in communication with the first moving bed reactor and the second moving bed reactor, and configured to remove the CO2 from the first syngas stream and the second syngas stream, wherein the H2/CO ratios of the first and second syngas streams are controlled by recycling substantially all of the CO2 from the separation unit to the first moving bed reactor and the second moving bed reactor;
• and
• a third co-current fluidized bed reactor in communication with the first moving bed reactor and the second moving bed reactor and configured to oxidize the first reduced metal oxide and the second reduced metal oxide with an oxidizing agent to produce oxidized metal oxide particles and recycle the oxidized metal oxide particles to the first moving bed reactor and the second moving bed reactor for subsequent reduction reactions.