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Invited lecture-20190726

Title: Moving Bed Chemical Looping Process for Partial and Full Carbonaceous Fuel Oxidation – Prospect and Development in Power and Chemical Production Applications
Reporter: Dr. Andrew Tong, Research Assistant professor at Ohio State University, USA
Time and Address: Jul. 26, 2019, 2:00-3:30 PM, 304 Meeting Room
Abstract: Researchers are developing chemical looping technologies to convert of carbonaceous fuels to high value chemicals and/or electricity with minimal CO2 emission. These processes use a metal oxide or metal sulphate to partially or fully oxidize the fuel source to a desired product while being regenerated with air and/or steam in a separate reactor. The chemical looping redox reaction pathway is capable of high product yields without the need for molecular oxygen and minimizes gas product separation requirements. This presentation will summarize the chemical looping concept, its 220-year history, its advantages and the challenges faced by those researchers developing these processes. The Ohio State University (OSU) has advanced the chemical looping concept in the development of 2 pilot-scale demonstration plants for coal combustion with CO2 capture and gaseous fuel conversion to high purity H2 as well as multiple sub-pilot test units for syngas generation from biomass, natural gas, and coal. In each of these processes, a moving bed reducer reactor is used for partial and full oxidation of the carbonaceous fuels to CO/H2 and CO2/H2O, respectively. A slugging bed combustor reactor is used to regenerate the oxygen carriers to their original oxidation state. Interconnecting nonmechanical valves between each reactor are used for gas sealing and solid flow control. This paper summarizes the key developments of four chemical looping processes – the 250kWth-3MWth syngas chemical looping (SCL) pilot plant, the coal direct chemical looping (CDCL) 25 kWth sub-pilot unit and 250 kWth pilot plant, and the 15 kWth coal to syngas (CTS) and shale gas to syngas (STS) sub-pilot units. Key reaction modeling of the oxygen carrier, process assessments of each technology for power and chemical production applications, design considerations of the moving bed chemical looping reactor system, and experimental results from over 2,000 hours of cumulative pilot and sub-pilot plant operations will be discussed. The counter-current moving bed reactor design the CDCL and SCL process ensure nearly full fuel conversion to CO2 with minimal solid circulation and capability of producing high purity H2. The co-current moving bed reducer reactor in the CTS and STS processes provides a desirable gas-solid contacting pattern that minimizes carbon deposition and maximizes the syngas yield. The syngas produced by the CTS and STS processes can achieve a H2:CO ratio of 2:1 with little CO2, unconverted hydrocarbons, and steam, which is required for down-stream processing to produce liquid fuels and chemicals.

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