Title:
Using Energy Crops Pellets in a Domestic Boiler from the Standpoint of Emissions
Author(s):
Sáez, F., González, A., Gómez, M., Martínez, J.M.
Document(s):
Paper
Abstract:
The objective of this work is the study of several types of pellets coming from energy crops (poplar and a mixture of brassica and poplar) and pine sawdust as reference, used as fuel in a boiler of the domestic sector, comparing their behavior from the energy and environmental point of view. The boiler used is a burner with automatic feeding regulation and primary and secondary air flow. Its power is 25 kWth and the generated heat is used as heating in a greenhouse of a Public Research Center. In order to carry out the objective, the boiler has been monitored during one week (8 hours daily) with each of the selected biomasses and under operating conditions of greater stability from the combustion point of view, and where gas emission samples have been taken simultaneously to determine the conventional and PAHs emissions. The biomasses selected (poplar, mixture of brassica + poplar and pine sawdust) have the following physical and chemical characteristics: Low moisture content (around 8 %); high volatile contents 85.6; 81.1 and 80.9 (% d.b.), low ash amounts (0.6; 2.9 and 3.4 % d.b.), and low heating value (MJ/kg w.b.) (19.0; 18.2 and 18.1), respectively. The energy yield reached with the three biomasses in the monitored boiler has been greater than 93%. In the combustion of the different biomasses the emitted average values of CO are 150 mg/Nm3 with poplar pellets, 200 mg/Nm3 with sawdust pellets and 450 mg/Nm3 with pellets from poplar (90%) + brassica (10%). The PAHs emissions were also low; 4.7 µg/Nm3 (poplar pellet), 4.1 µg/Nm3 (sawdust pellet) and 7.1 µg/Nm3 with (poplar+brassica pellet).
Keywords:
emissions, pellets, grate boiler, polycyclic aromatic hydrocarbons
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:
VP2.1.13
Pages:
1250 - 1254
ISBN-13:
978-88-89407-55-4
ISBN-10:
88-89407-55-7
Paper DOI:
10.5071/19thEUBCE2011-VP2.1.13
Price:
FREE
