大学生烘焙方面的论文

1、大学生烘焙方面的论文Highlights（1）Color change and hygroscopic transformation of poplar and fir from torrefaction are analyzed.（2）Total color difference linearly increases with increasing mass loss or torrefaction severity.（3）Hygroscopic transformation of biomass is evaluated by equilibrium moisture content (E

2、MC) and contact angle.（4）Hygroscopicity reduction extent (HRE) can reach up to 57.39% at 230C.（5）Carbon, hydrogen, and oxygen removals from torrefaction can be predicted by color change and HRE.摘 要 生物炭是一种非常具有前景的二氧化碳储存媒介，其生产和储存被认为是有效实现负二氧化碳排放的关键途径。烘焙是用于生产生物炭的热化学转化过程。生物炭具有疏水性，与其母体生物质不同的是生物炭具有吸湿性，有利于物质

3、储存。为了评估烘焙生物质的吸湿转化，本文在200-230的温度下烘烤两种木质生物材料杨树（硬木）和冷杉（软木），以及颜色，平衡水分含量和原料接触角的变化。研究结果表明，烘焙木材的总色差随着质量损失的增加而线性增加。烘焙冷杉的吸湿性降低程度高于烘焙白杨。接触角的测试表明原木的吸湿性较烘焙木材明显。本文还分析了烘焙过程中生物质的脱碳、脱氢和脱氧现象。通过总色差和吸湿性降低程度发现三个指标表现出较好的相关性。同时，本文进行了关于改善生产的生物炭的疏水性的综合研究，结果表明了生物炭的碳储存和负二氧化碳排放的潜力。AbstractBiochar is a potential medium for car

4、bon storage, so its production and storage have been considered as is a crucial route to effectively achieve negative CO2emissions. Meanwhile, torrefaction is a thermochemical conversion process for producing biochar. Biochar is featured by its hydrophobicity, which makes it different from its paren

5、t biomass with hygroscopicity and is conducive to material storage. To evaluate the hygroscopic transformation of biomass from torrefaction, two woody biomass materials of poplar (hardwood) and fir (softwood) are torrefied at temperatures of 200230C, and the variations of color, equilibrium moisture

6、 content, and contact angle of raw and torrefied samples are examined. The results indicate that the total color difference of torrefied woods increases linearly with increasing mass loss. The hygroscopicity reduction extent in torrefied fir is higher than in torrefied poplar, and can be increased b

7、y up to 57.39% at 230C. The tests of the contact angle suggest that the hygroscopicity of the raw woods is evidently exhibited, whereas the angles of the torrefied woods are in the range of 94113, showing their hydrophobic surfaces (90). The decarbonization, dehydrogenation, and deoxygenation phenom

8、ena of the biomass during torrefaction are also analyzed. It is found that the three indexes can be correlated well by the total color difference and hygroscopicity reduction extent. A comprehensive study on the improvement of hydrophobicity of produced biochar has been performed, which clearly shows the potential of carbon storage and negative CO2emissions by biochar.KeywordsTorrefactionHygroscopicityEquilibrium moisture content (EMC)Contact angleColor changeDevol