Physical and Mechanical Properties of Briquettes Produced from Energy Plants

Abstract

The study deals with the use of energy crops for the production of thermal energy in the form of briquettes and devising appropriate parameters for their production. Briquettes were produced from seven kinds of energy crops, Salix viminalis, Miscanthus sinensis, Rosa multiflora, Polygonum sachalinensis, Helianthus tuberosus, Sida hermaphrodita and Spartina pectinata, specifically. In the production of briquettes, moisture is the most important properties of material to be pressed, which ranges from 8 to 15 % as it was observed. At a higher humidity it has not been possible to produce briquettes farther in the study conditions. Another important condition for the successful production of briquettes was the particle size of chopped mass. The optimum particle size range from 8 to 20 %. The briquettes were pressed at a pressure of 21 MPa and with diameter of 50 %. Subsequently, physical and mechanical properties (density, moisture, mechanical resistance) and chemical properties (chlorine, iron, nitrogen, calcium, ash, lignin content) were measured. The briquettes density reached from 800 to 900 kg.m−3 with calorific value from 14 to 19 MJ.kg−1 which refers to fact that energy crops are competitive to fossil fuels by their calorific value.

Two Novel Energy Crops: Sida hermaphrodita (L.) Rusby and Silphium perfoliatum L.—State of Knowledge

“…They suggested replacing artificial drying with storage, allowing S. hermaphrodita stems to dry naturally for six months. Urbanovičová et al [126] produced S. hermaphrodita briquettes using a hydraulic press, reporting a calorific value of 15 MJ kg −1 . They reported that the briquettes had a similar density, durability, moisture content, and calorific values as briquettes produced from other crops.…”

Effect of Moisture Content and Hammer Mill Screen Size on the Briquetting Characteristics of Woody and Herbaceous Biomass

“…Common densification systems that are typically used in the biomass industry are pellet mill and briquette press (Tumuluru et al, 2011). A pellet mill typically produces a densified product with a bulk density of 650 to 750 kg/m 3 , whereas a briquette press produces a densified product with a bulk density of 350 to 450 kg/m 3 and unit densities of 600-850 kg/m 3 (Tumuluru et al, 2011;Urbanovičová et al, 2017;Mani et al, 2006;Ndindeng et al, 2015). The quality of the densified product produced using pellet mill and briquette press depends on process conditions such as length-to-diameter ratio or compression ratio of the pellet die, die diameter, and biomass properties (particle size of the grind, biomass moisture content, and biomass composition).…”

Briket Arang Tempurung Kawista (Limonia acidissima) Teraktivasi NaOH dengan Perekat Alami

“…Kandungan abu yang tinggi dapat menurunkan nilai kalor briket sehingga kualitas briket semakin rendah [4]. Semakin besar nilai kalorinya maka semakin banyak energi termal yang dihasilkan oleh pembakarannya [5]. Tempurung kawista sangat berpotensi sebagai karbon aktif [3].…”

“…Crucible dipindahkan dari tanur, didinginkan dalam desikator, dan ditimbang segera. Kadar abu (%) dihitung dengan persamaan (5).…”