Comparison of carbon capture IGCC with pre-combustion decarbonisation and with chemical-looping combustion

Energy analysis of two stage packed-bed chemical looping combustion configurations for integrated gasification combined cycles

“…Gunn and Misbah equation [33] Peax ¼ 1 C C A vg $dp 1 The O 2 depleted air from the oxidation stage might be also used for this purpose, with expected minor effects on plant efficiency and avoiding the auxiliary N 2 compressor. The drawback of this option is that such gas may contain some residual oxygen during the breakthrough time at the end of the oxidation stage, that may lead to unwanted gas phase reactions with the syngas inside the reactors and in the gas piping lines right before or after the purging phase.…”

“…1 This stream is pressurized and fed to the packed bed reactors at 478 C and 20.4 bar (#9). The purge outlet is mixed with the heat removal stream.…”

“…The electrical efficiency for IGCLC plants has been calculated by several researchers, based either on fluidized bed [1,5e7] or packed bed [2] CLC processes. Erlach et al [1] and Spallina et al [2] also compared the performance of IGCLC plants using nickel and ilmenite respectively as oxygen carriers with benchmark plants, demonstrating that in an IGCLC power plant a higher electrical efficiency can be obtained than with conventional pre-combustion CO 2 capture. Improvements by 3e5 percentage points have been reported in these works [1,2].…”

“…Erlach et al [1] and Spallina et al [2] also compared the performance of IGCLC plants using nickel and ilmenite respectively as oxygen carriers with benchmark plants, demonstrating that in an IGCLC power plant a higher electrical efficiency can be obtained than with conventional pre-combustion CO 2 capture. Improvements by 3e5 percentage points have been reported in these works [1,2]. The packed bed and the circulating fluidized bed configurations for CLC have been compared as well resulting in minor differences regarding the overall process efficiency [8].…”

“…So, the total reaction enthalpy is the same as with regular fuel combustion. Such a system, thanks to the intrinsic separation of the CO 2 reaction product, leads to a higher electrical efficiency of the complete plant with respect to most of the other carbon capture technologies [1,2].…”