A lab-scale single-channel press was employed for producing pellets and the effect of pressure, die temperature, moisture content (MC), particle size, and binding agent on pellet quality was investigated. Meanwhile, torrefaction subsequent to pelletization was performed and the quality of pellets was evaluated under different torrefaction conditions. From the analysis of variance (at p < 0.05), temperature (70–200 °C), pressure (70–160 MPa), and MC (5.5–28%) were found most significant factors for density, strength, and compression energy of pellets. Particle density and strength of raw wood pellets were significantly affected by temperature and pressure. The highest particle density and strength (1.307 g/cm³, 11.8 N/mm²) for particles of 0.25–0.5 mm and (1.300 g/cm³ and 10.7 N/mm²) for particles of 0.5–1.41 mm were found at a temperature of 200 °C (pressure ≥ 100 MPa and MC 5.5%), indicating that pelletization at a temperature of 200 °C was beneficial. The relaxed density of pellets remained the same as of particle initial density after storage time of 2 weeks. The expansion ratio of the pellet was found lower. Use of synthetic resin as a binder in the proportion of 1:9 was found optimum, the particle density increased from 1.19 to 1.24 g/cm³ (0.25–0.5 mm) and from 1.17 to 1.22 g/cm³ (0.5–1.41 mm) and energy consumption reduced by 9.39% (0.25–0.5 mm) and 8.7% (0.5–1.41 mm). Pellets made at a temperature of 200 °C were found water-resistive as compared to those made at other temperatures. The highest lower heating value, i.e., 26.76 MJ/kg of torrefied pellets (TOPs) was achieved at 300 °C and 120 min. Torrefaction process parameters adversely affected the particle density, volumetric energy density, strength, and durability of TOPs. The highest true density (1.85 g/cm³) and porosity (65 v %) for TOPs were achieved at 300 °C and 120 min, much higher than those of raw pellets. Moisture uptake of TOPs at 300 °C was 2.0–2.8 wt.%, showing strong water-resistant ability. From the results of FTIR, O–H bond was destroyed after torrefaction.

采用实验室规模的单通道压机生产粒料，并研究了压力，模头温度，水分含量（MC），粒度和粘合剂对粒料质量的影响。同时，进行制粒后的烘焙，并在不同的烘焙条件下评价颗粒的质量。通过方差分析（在p  <0.05时），发现温度（70-200°C），压力（70-160 MPa）和MC（5.5-28％）是影响密度，强度和压缩能量的最重要因素颗粒。温度和压力显着影响原木颗粒的颗粒密度和强度。最高的颗粒密度和强度（1.307克/厘米³，11.8牛顿/毫米²）在200°C（压力≥100 MPa和MC 5.5％）的温度下发现0.25-0.5 mm的粒子和（1300克/厘米³和10.7 N / mm ²）的0.5-1.41毫米的粒子在200°C的温度下造粒是有益的。储存2周后，颗粒的松弛密度保持与颗粒初始密度相同。发现粒料的膨胀率较低。发现以1：9的比例使用合成树脂作为粘合剂是最佳选择，颗粒密度从1.19增至1.24 g / cm ³（0.25-0.5 mm），从1.17增至1.22 g / cm ³（0.5–1.41毫米）和能耗分别降低了9.39％（0.25–0.5毫米）和8.7％（0.5–1.41毫米）。与在其他温度下制造的颗粒相比，发现在200°C的温度下制造的颗粒具有防水性。在300°C和120分钟时达到了最高的较低发热量，即26.76 MJ / kg的烘焙颗粒（TOP）。烘焙工艺参数会对TOP的颗粒密度，体积能量密度，强度和耐久性产生不利影响。TOP的最高真密度（1.85 g / cm ³）和孔隙率（65 v％）在300°C和120 min时达到，远高于未加工的颗粒。TOP在300°C时的吸湿率为2.0–2.8 wt。％，显示出强大的防水能力。根据FTIR的结果，焙干后O–H键被破坏。