A reactive separation process for pre-combustion CO2 capture employing oxygen-blown coal gasifier off-gas

CO2 Post-combustion Capture: A Critical Review of Current Technologies and Future Directions

“…Concurrently, the residual gas, enriched with hydrogen, is utilized as a fuel source in boilers or gas turbines within an Integrated Gasification Combined Cycle (IGCC) system, which is instrumental in electricity generation. Although this pre-combustion method can potentially achieve high carbon dioxide capture efficiencies, up to 80% before combustion, it is often associated with substantial capital and operational expenses, which diminishes the overall economic viability and attractiveness of this CO 2 capture method. , Specifically, the primary energy cost linked to pre-combustion technology arises from the water–gas shift reaction, i.e., from the need to provide heat for the WGS reaction. , …”

“…3,15 Specifically, the primary (92−93% recovery) significant energy loss compared to post-combustion capture enhanced energy efficiency in separation and compression of CO 2 , resulting from decreased gas volume and elevated pressure along with higher CO 2 concentrations improvements needed for energy recovery efficiency requires a chemical plant in front of the turbine retrofitting increases cost and complexity, hindering commercialization lower regeneration energy due to the use of physical solvents for CO 2 separation (mature physical absorption technique) high-pressure operation can be challenging flexibility to switch between H 2 production and electricity generation complex chemical processes may lead to plant shutdowns uses less water than post-combustion capture requires cleaned gas stream and costly scrubbing for NO x control synthesis gas can be used as an alternative turbine fuel gasification stage and associated heat transfer need improvement hydrogen can be utilized in fuel cells, transportation, and chemical synthesis cooling of flue gas to CO 2 capture is necessary extensive supporting systems required, like air separation units readily available at the commercial level for the removal of acidic gases efficiency loss in the water−gas shift section absorption method requires lower regeneration temperatures; ionic liquids are being explored energy cost linked to pre-combustion technology arises from the water−gas shift reaction, i.e., from the need to provide heat for the WGS reaction. 16,17 Information regarding the pre-combustion capture method is summarized in Table 2. The primary areas for advancement and hurdles in this technology revolve around enhancing the gasification phase, the CO 2 separation process (absorption), and implementing novel approaches for syngas cleaning strategies.…”

On Process Intensification through Membrane Storage Reactors

“…In this work, assessment of SMR-MSR performance was performed by carrying out sixteen combinations (trials) of the above five parameters, as listed in Table 3 below. The values for D a and Θ were chosen by selecting a range of reasonable values for the parameters shown in Equation (8). Fixing the operating pressure P * = 25(bar), temperature T * = 900(K), catalyst density ρ c = 2355.2 kg m 3 [14], and reference reaction rate…”

“…We have also developed and experimentally studied a novel hybrid membrane reactor-adsorptive reactor (MR-AR) configuration. This technology, which is currently being field-tested, produces high-purity hydrogen with simultaneous carbon dioxide capture for application to Integrated Gas Combined Cycle (IGCC)-based power generation [8].…”