Abstract
This study presents the results obtained from the operation of a 20 kWth in situ gasification chemical-looping combustion (iG-CLC) unit with a Chinese bituminous coal as the fuel and a natural iron ore as the oxygen carrier. This unit was built based upon the concept of a novel iG-CLC system evaluated through our previous cold-model tests. It is mainly composed of a high-flux circulating fluidized bed riser as the fuel reactor, a cross-flow moving bed as the air reactor, and a combination of an inertial separator and a cyclone separator as the separation system. The actual thermal power inputs from the coal for the reported tests in this study were about 11 kWth and the total duration reached about 70 h. The flow patterns and reaction characteristics of the whole system were investigated, and the effects of the fuel reactor temperature on the distributions of gas components in the two reactors were elucidated. At the fuel reactor temperature of 950 °C, the CO2 yield, gas conversion, carbon capture efficie...
Highlights
A promising approach for the implementation of solid fuel Chemical looping combustion (CLC) is called in situ gasification chemical looping combustion.27−29 In the iG-CLC process, the solid fuel is directly fed into the fuel reactor (FR) where it is mixed with the oxygen carrier (OC)
On the basis of our design and operational experience achieved with the cold experimental apparatus of the novel iG-CLC system, we have built and successfully operated a 20 kWth hot iG-CLC unit with a Chinese bituminous coal as the fuel and a natural iron ore as the oxygen carrier
The following conclusions can be drawn from the present study: [1] Both stability in operation and good reaction performance were achieved with the hot unit, verifying the operational feasibility and potential of the novel iG-CLC system
Summary
Chemical looping combustion (CLC), which possesses an inherent feature of separating CO2 during the combustion process, has been regarded as one of the most promising novel combustion technologies with low cost of CO2 separation.. A promising approach for the implementation of solid fuel CLC is called in situ gasification chemical looping combustion (iG-CLC).− In the iG-CLC process, the solid fuel is directly fed into the fuel reactor (FR) where it is mixed with the oxygen carrier (OC). Steam or CO2 or their mixture is supplied into the FR as both the fluidizing gas and gasification agent. Because the solid fuel and air are placed in two different reactors, the flue gas leaving the FR will only contain CO2 and H2O but not N2. Almost pure CO2 can be obtained after the condensation of H2O
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