Abstract
The ignition and combustion behavior of biomass and biomass blends under typical heating conditions were investigated. Thermogravimetric analyses were performed on stalk and woody biomass, alone and blended with various additive weight ratios. The combustion process was enhanced by adding oxygen to the primary air. This led to shorter devolatilization/pyrolysis and char burnout stages, which both took place at lower temperatures than in air alone. The results of the ignition study of stalk biomass show a decrease in ignition temperature as the particle size decreases. This indicates homogeneous ignition, where the volatiles burn in the gas phase, preventing oxygen from reaching the particle surface.The behavior of biomass fuels in the burning process was analyzed, and the effects of heat production and additive type were investigated. Mixing with additives is a method for modifying biofuel and obtaining a more continuous heat release process. Differential scanning calorimetric-thermogravimetric (DSC-TGA) analysis revealed that when the additive is added to biomass, the volatilization rate is modified, the heat release is affected, and the combustion residue is reduced at the same final combustion temperature.
Highlights
Biomass, such as straw, grasses and wood, is used in various forms for energy production
The effect of particle size on ignition temperature was investigated on wheat straw and flax straw samples
Linear regressions gave the following relationships: Wheat straw Ti (◦C) = 241.9 + 2.731 · D, Flax straw Ti (◦C) = 265.3 + 2.427 · D. These values imply that wheat straw ignites at lower temperatures than flax straw
Summary
Biomass, such as straw, grasses and wood, is used in various forms for energy production. Many technologies for biomass utilization have been studied in the last two decades, e.g. These technologies are in various stages of development, whereby combustion is most developed and most frequently applied. Biofuel products are sometimes mixed with other biomass, semi-fossil peat, fossil coal and catalyst to achieve better control of the burning process [1]. There have been few studies on the co-firing of biomass blends for energy generation [2]. The present work was undertaken to determine whether blending different biomass fuels influences the combustion performance, and whether the addition of a specific char additive can modify the burning velocity in the burnout stage and unify the thermal properties. Non-isothermal thermogravimetry was applied to determine the combustion characteristic of six samples, namely wheat straw, rape straw, flax straw (leftover after scutching), pulp-mill lignin, garden peat, and hardwood charcoal
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