Feasible utility of inorganic remains from potable water purification process in chemical looping combustion studied in TG

Abstract

The objective of the research is to prepare naturally occurring Fe-based materials for use as oxygen carriers and investigate their reactivity in terms of their applicability to energy systems. The inductively coupled plasma optical emission spectrometry test showed that the sediments from potable water purification were largely composed of Fe 2 O 3 (57.8-58.1 %), SiO 2 (25.2-30.7 %), CaO (3.92-8.43 %), and Mn 3 O 4 (0.94-1.39 %). Sediments were examined by cyclic redox experiments in the thermogravimetric analyzer and were compared with reference materials. Gaseous (3 % H 2 ) and solid fuel (hard coal) were tested in terms of chemical looping combustion (CLC). Three cycle tests showed their good reactivity performance. The temperature-depended oxygen transport capacity varied from 4 to 13.9 % by mass. The fairly stable performance was observed during twenty redox cycles. The X-ray powder diffraction patterns after cycling tests showed a stable crystalline phase and confirmed that complete regeneration was achieved, that is contrary to synthetic carriers. Possibly other elements may help to maintain their reactivity and prevented the silicate formation. Scanning electron micrographs of reacted samples showed minor morphology changes. Based on these results, those wastes might be successfully used in a CLC process as efficient and low-cost oxygen carriers.

Extremely Stable and Durable Mixed Fe–Mn Oxides Supported on ZrO2 for Practical Utilization in CLOU and CLC Processes

“…Many materials were recently under consideration as suitable candidates for OCs, including natural ores (e.g., ilmenite, iron ores etc.) [6] or synthetic materials purposely designated for that role as OCs based on mixed oxides, or perovskite-based OCs [7,8]. As a result of advanced study, various transitional metals oxides were examined as potential candidates for OCs such as copper, nickel, iron, manganese, or cobalt oxides.…”

Studies on the redox reaction kinetics of selected, naturally occurring oxygen carrier

“…Several suitable low-cost Fe-based oxygen carriers have been identified [17] that exhibit higher syngas (50 % H 2 /50 % CO) conversion rates than those rates that were obtained using ilmenite. Promising results were also obtained for sediments from potable water purification, which were composed mainly of Fe 2 O 3 (57.8-58.1 %) [19]. The maximum oxygen transport capacity varied for these sediments, mainly from 4 to 13.9 mass%.…”

“…Recently, some minerals [15][16][17][18] industry wastes [15] and other wastes [19,20] have been considered as inexpensive oxygen carriers for the chemical-looping combustion. The reason for the use of the aforementioned oxygen carriers, which are derived from natural materials and are therefore significantly less expensive, is that it lowers the cost of the overall process.…”

Degradation of Amine Solvents Used for Co2 Removal from Flue Gas with High Co2 Concentration

“…The "clean coal technologies" should enable the combustion of fossil fuels with a limited emission of greenhouse gases to the atmosphere. There is a huge number of technologies in the industry that are suitable for the separation of CO 2 from fossil fuel combustion processes, such as: physical and chemical absorption, adsorption, membrane processes, cryogenic processes or the chemical loop [3], [6][7][8][9][10][11][12]. Of these, chemical absorption is the most developed and most commonly used method for removing CO 2 from large gas streams.…”