Treatment of Flue Gas in a CO2 Capture Pilot Plant for a Commercial CFB Boiler

Abstract

The problem of reducing carbon dioxide emissions from flue gas, particularly from flue gas originating from coal-firing CFB systems, is currently an important challenge. Many centers around the world have tested post-combustion CO2 capture systems. One of these systems, operated using DR-VPSA adsorption technology (dual-reflux vacuum pressure swing adsorption), was tested under the Strategic Project in Poland. The flue gas in this study originated from a supercritical CFB boiler (460 MWe). An important problem involved in capturing CO2 from flue gas is the occurrence of SO2 and NOx. These substances have a negative effect on the CO2 adsorption process. In this study, commercial impregnated activated carbon was used to remove SO2 and NOx from CFB flue gas in the pre-treatment section during the tests of a pilot CO2 capture unit in a large-scale CFB boiler at the Lagisza Power Plant (Poland). The spent activated carbon was analyzed using several different methods (N2 adsorption–desorption isotherms, SEM-EDX, XRD, FTIR, and TG) to evaluate the efficiency of the operation and life span of the adsorbent used in the SO2 and NOx removal unit. The results demonstrate that using commercial impregnated activated carbon in the pre-treatment section ensures sufficient flue gas purification and the removal of sulfur oxides but remains insufficient for nitrogen oxides.

Synthesis, characterisation and carbon dioxide capture capacities of hierarchically porous Starbons®

“…82 It should also have a low enthalpy of carbon dioxide adsorption to minimise the energetic cost of carbon dioxide release, rapid kinetics for both adsorption and desorption and the carbon dioxide capture capacity should be reproducible over multiple cycles. 80,81 The activated Starbons ® reported in this work have been shown to meet the above requirements with the additional advantage of being sustainably sourced from waste biomass. The nonactivated Starbon ® precursors are commercially available and are being produced on a 10s-100s Kg scale.…”

“…80 These problems can all be avoided by use of solid carbonaceous adsorbents to physisorb carbon dioxide in a pressure swing process, technology which is currently at pilot plant scale. 81 A commercially viable, carbon based adsorbent should be reliably producible on a large scale, have a high selectivity for carbon dioxide over nitrogen and tolerate the presence of water. 82 It should also have a low enthalpy of carbon dioxide adsorption to minimise the energetic cost of carbon dioxide release, rapid kinetics for both adsorption and desorption and the carbon dioxide capture capacity should be reproducible over multiple cycles.…”

Evaluation of Prediction Models for the Physical Properties in Fire-Flooding Exhaust Reinjection Process

“…As an international standard named ISO20765-2 [46], the GERG-2008 equation is the extension of the GERG-2004 model [47]. This equation covers 21 S, He, and Ar. Being explicit in the Helmholtz free energy as a function of density, temperature, and composition, the GERG-2008 equation was constructed by fitting a large number of experimental data to obtain the regression coefficients.…”

“…Comparison of the components of acid gas, flue gas, and fire-flooding exhaust (unit: mol %). Xinjiang Oilfield, China [18] Some technologies-including burning [19], desulfurization [20], pressure swing adsorption [21], CO 2 separation [22], etc.-have been applied to effectively treat the harmful components in the fire-flooding exhaust. Unfortunately, the valuable hydrocarbon resource in it is wasted meanwhile.…”

Estimation of the Solid Circulation Rate in Circulating Fluidized Bed System Using Adaptive Neuro-Fuzzy Algorithm

“…Due to the decrement in amount of Nitrogen Oxide, Sulphur Oxide, and low combustion temperature, the gasifier performance would be improved; also the size of boiler would become smaller. Shape is also an important factor which is beneficial for FBC [16][17][18][19][20]. FBCs are categorized based on fluidized bed; some of them are fixed bed combustor, Atmospheric/Bubbling bed combustion, Turbulent FBC, Fast bed/Circulating FBC, Transport FBC.…”