کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5134419 1492950 2017 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Volatile gases from biomass pyrolysis under conditions relevant for fluidized bed gasifiers
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
Volatile gases from biomass pyrolysis under conditions relevant for fluidized bed gasifiers
چکیده انگلیسی


- Knowledge of the pyrolytic products is needed to evaluate biomass gasifiers.
- A small fluidized bed is used to simulate biomass pyrolysis within 600-975 °C.
- Yields of char, soot, total liquids and total volatile gas are provided.
- The composition and properties of the total volatile gas are investigated.
- Relations involving yields and properties of volatile gases are evaluated.

The pyrolytic volatiles released from a converting biomass particle are investigated in this work through laboratorial fluidized bed experiments simulating conditions typical of large-scale gasifiers. Two types of wood (eucalyptus and pine) and two types of pellets (forest residues and wood) with particles of 6-8 mm in diameter are fed over the hot bubbling bed at temperatures within 600-975 °C. The resultant major pyrolytic products (char, soot, liquids and permanent gas) are collected to verify the overall mass balance, and the composition of the permanent gas is resolved in C3H8, C2H6, C2H4, CH4, CO2, CO, and H2. Primary pyrolysis of the parent fuel particles is essentially complete at 600 °C and further increase of the temperature mainly leads to a progressive change in the composition of the volatile gas mixture. Although the gas release does not attain thermodynamic equilibrium under the conditions tested, our results show that the yields of CO2 and light hydrocarbons go through maxima as temperature increases to give rise to CO and H2 as the preferable species at high temperatures. As a whole, the gas composition evolves in such a way that the corresponding lower heating value steadily increases with temperature increase, from about 11 MJ/kg at 600 °C to above 17 MJ/kg at 950 °C. Furthermore, the yields of key gas species were found well correlated to each other (C2H4vs. CH4, CH4vs. CO and H2vs. CO), with the relation between the yields of H2 and CO being slightly dependent on the composition of fuel.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Analytical and Applied Pyrolysis - Volume 127, September 2017, Pages 57-67
نویسندگان
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