Biomass pellet fuel is one of the important forms of biomass energy utilization. How to get high quality pellet fuel in the production process is a hot topic of discussion nowadays. Since the quality of biomass pellets is sensitive to the pelletizing conditions, the aim of this research is to investigate the complex relationship between pelletizing conditions, physical quality, and pelletizing energy consumption. In this study, Microalgae, apple tree wood chips, corn cobs and sunflower seed husks were selected for pelletizing in a single pelletization system, with several controlled operating parameters. Subsequently, pellet sample density, durability, and pelletizing energy consumption were tested. A response surface methodology (RSM) multi-objective optimization method was used to develop models for predicting and describing the physical properties of the pellets and the pelletizing energy consumption, and to optimize the operating parameters. The results showed that the optimization results of the four pellet RSM methods corresponded well with the values of the high-quality pellets produced (all ≤5%). Compared to other materials, microalgae can generate high density pellets at lower pressures and thus reduce energy consumption and cost. The microalgal pellet optimal preparation parameters were also obtained via RSM (temperature 108 °C, pressure 76.2 MPa and moisture content 11%). Under the optimal parameters, the pellet durability, density, and pelletizing energy consumption were 96.5%, 1658.4 kg/m³ and 9.19 kJ/kg, respectively. It is clear that raw materials such as microalgae are potential and valuable feedstocks for the production of biomass pellets.

生物质颗粒燃料是生物质能利用的重要形式之一。如何在生产过程中获得高质量的颗粒燃料是当今讨论的热门话题。由于生物质颗粒的质量对造粒条件很敏感，本研究的目的是研究造粒条件、物理质量和造粒能耗之间的复杂关系。在这项研究中，选择了微藻、苹果树木屑、玉米芯和葵花籽壳在单个造粒系统中造粒，并具有几个受控的操作参数。随后，测试了颗粒样品密度、耐久性和造粒能耗。响应面法 (RSM) 多目标优化方法用于开发预测和描述球团物理特性和球团能量消耗的模型，并优化操作参数。结果表明，四种颗粒RSM方法的优化结果与生产的高质量颗粒的值（均≤5%）吻合良好。与其他材料相比，微藻可以在较低的压力下产生高密度的颗粒，从而降低能耗和成本。微藻丸的最佳制备参数也通过 RSM（温度 108°C，压力 76.2 MPa 和水分含量 11%）获得。在最佳参数下，球团耐用度、密度和造粒能耗为96.5%，1658.4 kg/m 结果表明，四种颗粒RSM方法的优化结果与生产的高质量颗粒的值（均≤5%）吻合良好。与其他材料相比，微藻可以在较低的压力下产生高密度的颗粒，从而降低能耗和成本。微藻丸的最佳制备参数也通过 RSM（温度 108°C，压力 76.2 MPa 和水分含量 11%）获得。在最佳参数下，球团耐用度、密度和造粒能耗为96.5%，1658.4 kg/m 结果表明，四种颗粒RSM方法的优化结果与生产的高质量颗粒的值（均≤5%）吻合良好。与其他材料相比，微藻可以在较低的压力下产生高密度的颗粒，从而降低能耗和成本。微藻丸的最佳制备参数也通过 RSM（温度 108°C，压力 76.2 MPa 和水分含量 11%）获得。在最佳参数下，球团耐用度、密度和造粒能耗为96.5%，1658.4 kg/m 2 MPa 和水分含量 11%)。在最佳参数下，球团耐用度、密度和造粒能耗为96.5%，1658.4 kg/m 2 MPa 和水分含量 11%)。在最佳参数下，球团耐用度、密度和造粒能耗为96.5%，1658.4 kg/m^{分别为 3}和 9.19 kJ/kg。很明显，微藻等原材料是生产生物质颗粒的潜在且有价值的原料。