Gasifying sludge and slurry: Europe's circular economy in action

Buchholz, D.

doi:10.1016/j.ref.2015.10.019

Cited by 3 publications

(1 citation statement)

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“…Several different thermal MSS gasification designs are currently under development including down-draft gasification (Arjharn et al, 2013), two-stage gasification , three-stage gasification (Choi et al, 2016), fluidized bed gasification (Calvo et al, 2013;Kang et al, 2011), Dual Fluidized Bed gasification (Xiaoxu et al, 2012) as well as fixed bed gasification (Werle, 2015) and fixed bed co-gasification of MSS and woody biomass (Ong et al, 2015;. On a commercial or near-commercial level, the designs under development and testing include among others the SÜLZLE Kopf SynGas bubbling fluidized bed gasifier (Judex et al, 2012) and Outotec's dual-circulating fluidized bed gasifier (Buchholz, 2015).…”

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confidence: 99%

Low temperature circulating fluidized bed gasification and co-gasification of municipal sewage sludge. Part 1: Process performance and gas product characterization

et al. 2017

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Results from five experimental campaigns with Low Temperature Circulating Fluidized Bed (LT-CFB) gasification of straw and/or municipal sewage sludge (MSS) from three different Danish municipal waste water treatment plants in pilot and demonstration scale are analyzed and compared. The gasification process is characterized with respect to process stability, process performance and gas product characteristics. All experimental campaigns were conducted at maximum temperatures below 750°C, with air equivalence ratios around 0.12 and with pure silica sand as start-up bed material. A total of 8600kg of MSS dry matter was gasified during 133h of operation. The average thermal loads during the five experiments were 62-100% of nominal capacity. The short term stability of all campaigns was excellent, but gasification of dry MSS lead to substantial accumulation of coarse and rigid, but un-sintered, ash particles in the system. Co-gasification of MSS with sufficient amounts of cereal straw was found to be an effective way to mitigate these issues as well as eliminate thermal MSS drying requirements. Characterization of gas products and process performance showed that even though gas composition varied substantially, hot gas efficiencies of around 90% could be achieved for all MSS fuel types.

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