Title:
Improving the Ash Melting Behaviour of Low Sintering Culm Shaped Biomass Ashes
Author(s):
Mann, M., Hein, D., Krumm, W.
Document(s):
Paper
Abstract:
The focus of this paper is the investigation of low cost additives applied in combustion and gasification processes in a fluidized bed lab scale reactor. These additives should minimize the sintering and agglomeration tendencies of the ashes to realise high as well as constant process temperature. The new approach of this study is the use of fuel ashes instead of fuel. A rotary kiln at a temperature of 550 °C is used for fuel ashing. This temperature is essential to keep a maximum of the alkaline bounded in the ash. The ashing process at defined and constant conditions is the basis for repeatable and invariant conditions inside the indirect heated fluidized bed reactor. Thus, the effectiveness of different additive materials can be compared. Dolomite, calcite, kaolin, bauxite, olivine and magnetite as well as magnesia oxide are used as additives in a ratio to ash of 10 mass-percent. The lab scale fluidized bed reactor was operated under oxidizing and reducing atmospheres in a temperature range from 700 to 950 °C. The defluidisation experiments started at 700 °C and ended when agglomeration was detected. The agglomeration temperature of pure straw ashes was found at a temperature of about 800 °C. Using additives this temperature was increased to 890 °C.
Keywords:
additives, ashes, biomass, fluidized bed, gasification, sintering, straw
Topic:
Biomass Conversion Technologies for Heating, Electricity and Chemicals
Subtopic:
Combustion for small and medium scale applications
Event:
19th European Biomass Conference and Exhibition
Session:
VP2.1.22
Pages:
1277 - 1282
ISBN-13:
978-88-89407-55-4
ISBN-10:
88-89407-55-7
Paper DOI:
10.5071/19thEUBCE2011-VP2.1.22
Price:
FREE
