Biomass pelletization and logistics

生物质颗粒化和物流

• 批准号: RGPIN-2020-04882
• 负责人: Sokhansanj, Shahab
• 金额: $ 4.01万
• 依托单位: University of British Columbia
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=716941
• 关键词: Biomass; pelletization; logistics

LITERATURE A pelletized biomass flows like a grain, and as such biomass can benefit from an already well-developed grain handling technologies. However, biomass pellets are more prone to damage than grains. Biomass pellets tend to disintegrate when accidentally get wet with liquid water or expose to humid air. Moisture sorption and auto oxidation are two processes responsible for self-heating of pellets. The available literature does not address adequately the process of heat accumulation in bulk pellets. PROGRESS My discovery research to date has led to the application of thermal pre-treatment to lessen the variability in biomass as a feedstock. A lower variability in biomass properties leads to an increased feedstock sources available to the industry. My logistics modeling approach has shown the logistical advantages of pellets over other forms of solid biomass like wood chips. I have also quantified the critical concentration of toxic gasses with respect to toxicity to human. The pellet industry has developed best practices to minimize potential harm to people working around stores. OBJECTIVES AND METHODOLOGY This research is a continuation of my long-term goal in developing optimal designs for converting raw biomass to usable feedstock. The scope of operations include size reduction, drying, and feedstock densification. The present research investigates the conditions that initiate self-heating and the ensuing factors that propagate heat within a pile of pellets. The proposed approach uses experimental data (gas concentration, temperature, vapor pressure, pellet swelling) to develop mathematical models. The models will be used for design and management of stored pellets. This research will create new and relevant knowledge for the bioenergy community and will serve to encourage further scholarly inquiries among current and future students and researchers. HQP This research engages one Ph.D. plus two M.Sc. students, and five undergraduate students, one per year. I am committed to hiring and training a diverse qualified HQP's. The Ph.D. will develop the heat/gas/vapor flow models. M.Sc.1 develops kinetics of heat of sorption for pellets. M.Sc. 2 develops kinetics of swelling and the resulting internal pressures. The undergraduates plan instrumentation, collect and analyze data on pellets produced on the new CFI funded laboratory pellet mill. IMPACT Self-heating and off-gassing are the two major causes of fires in confined spaces. The Canadian wood industry has experienced a number of fires, a few with fatalities. Unlike for grain stores, ventilation of stored pellets with air is not a safe practice for biomass pellets. The oxygen and water vapor in the ventilating air promote self-heating. To date, the complex processes involved in self heat have not been demonstrated clearly to the industry. My proposed research plans to do that. The wood- and in future the ag-pellet industry would contribute significantly to the Canada's rural economy.

造粒的生物质像谷物一样流动，因此生物质可以受益于已经开发良好的谷物处理技术。然而，生物质颗粒比谷物更容易损坏。生物质颗粒在意外地被液态水弄湿或暴露于潮湿空气时往往会分解。吸湿和自氧化是颗粒自加热的两个过程。现有的文献没有充分说明散装球团的热积累过程。 进展我的发现迄今为止的研究已经导致热预处理的应用，以减少生物质作为原料的变化。生物质性质的较低可变性导致工业可用的原料来源增加。我的物流建模方法显示了颗粒比其他形式的固体生物质（如木屑）的物流优势。我还量化了有毒气体对人体毒性的临界浓度。颗粒行业已经制定了最佳实践，以尽量减少对商店周围工作人员的潜在伤害。 这项研究是我长期目标的延续，即开发将原始生物质转化为可用原料的最佳设计。操作范围包括粉碎、干燥和原料致密化。本研究调查的条件下，启动自加热和随之而来的因素，在一堆小球传播热量。所提出的方法使用实验数据（气体浓度，温度，蒸汽压，颗粒膨胀）来开发数学模型。这些模型将用于设计和管理储存的颗粒。这项研究将为生物能源界创造新的相关知识，并将鼓励当前和未来的学生和研究人员进一步进行学术研究。 HQP本研究聘请了一位博士。加上两名硕士生和五名本科生，每年一名。我致力于招聘和培训多元化的合格HQP。的博士将开发热/气体/蒸汽流动模型。M.Sc.1开发了颗粒吸附热的动力学。理学硕士2发展了膨胀的动力学和由此产生的内部压力。本科生计划仪器，收集和分析在新的CFI资助的实验室造粒机生产的颗粒数据。 自热和排气是密闭空间火灾的两个主要原因。加拿大木材工业经历了多次火灾，其中一些造成死亡。与谷物仓库不同，用空气对储存的颗粒进行通风对于生物质颗粒来说不是一种安全的做法。通风空气中的氧气和水蒸气促进自加热。到目前为止，自热所涉及的复杂过程尚未向工业界清楚地展示。我提出的研究计划就是这样。 木材和未来的银颗粒工业将对加拿大的农村经济做出重大贡献。