Upgrading of soot sludge from waste to fuel by means of low temperature drying in fixed beds

Myllymaa, Tiina; Holmberg, Henrik; Arhippainen, Pentti; Ahtila, Pekka

doi:10.1016/j.fuproc.2015.06.030

Cited by 2 publications

(14 citation statements)

References 32 publications

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“…Drying curves can then be defined on the basis of the mass change and initial moisture content [27]. Drying conditions and the experimental tests for the soot sludge and sawdust mixture are described in more detail in [5].…”

Section: Experimental Test Equipmentmentioning

confidence: 99%

“…ChemEngineering 2020, 4, x 3 of 18 Figure 1. Formation process of the soot sludge (Reproduced from [5]. Illustration is based on the text in [26]).…”

Section: Experimental Test Equipmentmentioning

confidence: 99%

“…In Eastman's production plant, moist soot sludge is formed approximately 20 t wb /d. The moisture content of waste sludges can be reduced by removing water without vaporization (e.g., mechanical dewatering) [2,3] or using thermal drying [4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

“…A previous study by the authors [5] experimentally examined the ways soot sludge could be upgraded from waste to fuel by drying it at low temperatures (below 100 • C) before combustion. Drying tests were conducted in a fixed bed.…”

Section: Introductionmentioning

confidence: 99%

“…%). The previous study [5] also studied other mixture ratios for soot sludge and sawdust mixture. The goal was to find a mixture ratio that minimizes the use of sawdust but does not increase drying time too much.…”

Section: Introductionmentioning

confidence: 99%

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Economic Evaluation of Drying of Soot Sludge and Sawdust Mixture at Low Temperatures Using the Characteristic Drying Curve Method

2020

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Soot sludge is a waste stream formed in the fuel oil gasification of formic acid and hydrogen peroxide production. The soot sludge has a high moisture content (95%) and is presently combusted with heavy fuel oil in order to dispose of the sludge. Experimental tests earlier conducted by the authors have shown that the sludge can be convectively dried with sawdust in a fixed bed. By upgrading the sludge from waste to fuel, the utilization of oil can be decreased. In this study, characteristic drying curves (CDC) are determined for the sludge and sawdust mixture. The CDCs are further used to evaluate the economy of the mixture drying in a belt dryer by using the payback period method. Results show that the linear CDCs of the mixture can be used to extrapolate drying data from specific drying conditions to another when the bed height is 200 or 300 mm, and the inlet air temperature 40–100 °C. The economic analysis shows that drying is economical for all inlet air temperatures if the oil price is ≥350 €/t-oil. Sensitivity analyses reveal that the heat, sawdust and emission prices have no remarkable influence on the economy of drying if the oil price does not fall below c. 300 €/t-oil.

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Section: Experimental Test Equipmentmentioning

confidence: 99%

“…ChemEngineering 2020, 4, x 3 of 18 Figure 1. Formation process of the soot sludge (Reproduced from [5]. Illustration is based on the text in [26]).…”

Section: Experimental Test Equipmentmentioning

confidence: 99%