Abstract
Wheat straw briquettes are high performance combustible products obtained by densification from the wheat straw biomass without the use of additional adhesives or additives. The purpose of the paper is to analyze and to detail the physical properties (SR EN ISO / CEI 322 for moisture content by method of drying and weighing, and effective density method according to SR EN ISO / CEI 323: 2005) and calorific properties of these briquettes (high and low calorific value according to ÖNORM M7135 using the XRY-1C / China Calorimeter and ash content according to ASTM D1102-84: 2013 and ISO 18122: 2015) and to make a comparison between these briquettes and other briquettes obtained from wooden biomass. The tested briquettes had a moisture content of 8%, an effective density of 1214 kg/m3, a high calorific value of 17.670 MJ/kg, the low of 17.525 MJ/kg and an ash content of 5.6%. All these values correspond to the permissible limits of the standards in the field. The final conclusion of the paper shows that wheat straw briquettes had physical and calorific properties similar to those of wooden biomass.
Highlights
The vegetal biomass participates within the carbon cycle in nature, by using the carbon dioxide and eliminating the oxygen in nature [1]
The carbon dioxide participates in the photosynthesis process during the growth of vegetal matter, but it is the component which determines a burn out during the photosynthesis, approximately 1% from the energy received from the sun is transformed into chemical energy by the plants during their growth
The carbon dioxide is absorbed by the plants during the growth and forms a closed circuit, because the carbon dioxide which was absorbed by the plants during the growth will equal the same quantity which was eliminated during the burn out processes [4]
Summary
The vegetal biomass participates within the carbon cycle in nature, by using the carbon dioxide and eliminating the oxygen in nature [1]. The carbon dioxide participates in the photosynthesis process during the growth of vegetal matter, but it is the component which determines a burn out during the photosynthesis, approximately 1% from the energy received from the sun is transformed into chemical energy by the plants during their growth. The solar energy absorbed by the biomass forms the chemical structure of the biomass components, respectively the celluloses, hemicelluloses and the lignin [2]. The carbon dioxide is absorbed by the plants during the growth and forms a closed circuit, because the carbon dioxide which was absorbed by the plants during the growth will equal the same quantity which was eliminated during the burn out processes [4]. The biomass can be used in the combustion process and mostly this doesn't need huge investments in comparison to the hydro, solar, wind or geothermal energy [5]
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