流化床气流超微粉碎不同操作参数对玉米淀粉粒度的影响

Effects of different operating parameters on the particle size of corn starch in fluidized bed airflow ultrafine pulverization

中文关键词:  气流超微粉碎  操作参数  玉米淀粉  粒度

英文关键词:airflow ultrafine pulverization  operating parameters  corn starch  particle size

中文摘要:

      目的 研究流化床气流超微粉碎不同操作参数对玉米淀粉颗粒粒度的影响。方法 以玉米淀粉为原料, 通过流化床气流粉碎处理, 考察原料不同含水量、不同粉碎气体压力、分级轮转速、持料量等参数条件下气流粉碎处理对淀粉颗粒粒径、粒度分布、比表面积、粉体密度及流动性的影响。结果 不同操作参数对淀粉颗粒粒度影响显著, 在原料含水量6.18%, 气体压力0.8 MPa、持料量1.0 kg、分级转速3600 r/min操作参数条件下获得微细化玉米淀粉粒径最小, 中粒径D50为5.22 μm, 淀粉粒径大小显著降低, 微细化玉米淀粉的粒度分布较窄且均匀, 颗粒比表面积较原淀粉增大1.8倍, 为0.65 m2/g, 颗粒球形度较好; 粉碎降低了淀粉粉体密度, 最佳条件下淀粉松装密度和振实密度分别为0.48 g/cm3和0.70 g/cm3, 粉体流动性变差。结论 该研究为玉米淀粉资源的加工与应用提供了理论依据与技术支持。

英文摘要:

      Objective To study the effects of different operating parameters on the particle size of corn starch in fluidized bed airflow ultrafine pulverization. Methods Using corn starch as raw material, the effects of airflow pulverization on the particle size, particle size distribution, specific surface area, powder density and flowability of starch were investigated under the conditions of different water content of the raw material, different pulverizing gas pressure, the rotating speed of classification wheel, the holding capacity and other parameters. Results Different operating parameters had significant impacts on the particle size of starch. Under the operating parameters of water content 6.18%, gas pressure 0.8 MPa, holding capacity 1.0 kg, and classifier frequencies 3600 r/min, the micronized corn starch had the smallest particle size, the median diameter D50 of micronized corn starch was 5.22 μm, and the particle size of starch was significantly reduced. The particle size distribution of micronized corn starch was narrow and uniform, the specific surface area of starch was 1.8 times larger than that of raw starch, which was 0.65 m2/g, and the sphericity of starch granules was better. The crushing reduced the density of starch powder. Under the optimum conditions, the loose packing density and the compacted density of starch were 0.48 g/cm3 and 0.70 g/cm3, respectively. The fluidity of starch powder was worse than that of raw starch. Conclusion This study provides theoretical basis and technical support for the processing and application of corn starch resources.