Department of Mechanical Engineering, College of Engineering, Williams Tubman university, Maryland County, Harper, Liberia.
Department of Mechanical Engineering, College of Engineering, Landmark University, Omu-Aran, Nigeria.
Sci Rep. 2023 Nov 7;13(1):19242. doi: 10.1038/s41598-023-46054-7.
Biomass and its interactions for heat generation have received little attention. In this study, the woody biomass materials were Prosopis africana (PA), Harungana madascariences (HM), Vitrllaria paradoxa (VP), and Afzelia africana (AA). The composition (extractives, carbohydrate, and lignin) of the biomass was determined. The biomass was converted to charcoal in a traditional kiln. A thermo-kinetic examination of the charcoal samples was carried out. The kinetic parameters and potential reaction mechanisms involved in the decomposition process were both obtained using the integral (Flynn-Wall Ozawa) isoconversional methods in conjunction with the Coats-Redfern approach. The activation energy profiles for the charcoal samples in oxidizing atmospheres were 548 kJ/mol for AA, 274 kJ/mol for VP, 548 kJ/mol for PA, and 274 kJ/mol for HM. All charcoal samples underwent comprehensive, multi-step, complex reaction pathways for thermal degradation. The charcoal samples exhibit not only great potential for biochemical extraction but also for bioenergy applications. The significant amount of combustion characteristics in the raw biomass and charcoal samples indicates that each type of wood charcoal produced has more fixed carbon, less ash, and less volatile matter, all of which are desirable for the thermo-chemical conversion of biomass for the production of heat.
生物质及其产热相互作用一直未得到充分关注。在本研究中，木质生物质材料为非洲刺槐（PA）、马达加斯加猴欢喜（HM）、珍珠相思（VP）和非洲紫檀（AA）。测定了生物质的组成（抽提物、碳水化合物和木质素）。将生物质在传统窑中转化为木炭。对木炭样品进行了热动力学分析。采用积分（Flynn-Wall-Ozawa）等转化率法和 Coats-Redfern 方法，获得了热解过程中涉及的动力学参数和潜在反应机制。在氧化气氛中，木炭样品的活化能分布为 AA 为 548 kJ/mol，VP 为 274 kJ/mol，PA 为 548 kJ/mol，HM 为 274 kJ/mol。所有木炭样品均经历了综合的、多步骤的、复杂的热降解反应途径。木炭样品不仅具有很大的生化提取潜力，而且具有生物能源应用的潜力。原始生物质和木炭样品中大量的燃烧特性表明，每种类型的木炭都具有更多的固定碳、更少的灰分和更少的挥发分，这些特性对于生物质的热化学转化以生产热能都是理想的。
