大學(xué)生烘焙方面的論文

1、大學(xué)生烘焙方面的論文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 生物炭是一種非常具有前景的二氧化碳儲存媒介，其生產(chǎn)和儲存被認為是有效實現(xiàn)負二氧化碳排放的關(guān)鍵途徑。烘焙是用于生產(chǎn)生物炭的熱化學(xué)轉(zhuǎn)化過程。生物炭具有疏水性，與其母體生物質(zhì)不同的是生物炭具有吸濕性，有利于物質(zhì)

3、儲存。為了評估烘焙生物質(zhì)的吸濕轉(zhuǎn)化，本文在200-230的溫度下烘烤兩種木質(zhì)生物材料楊樹（硬木）和冷杉（軟木），以及顏色，平衡水分含量和原料接觸角的變化。研究結(jié)果表明，烘焙木材的總色差隨著質(zhì)量損失的增加而線性增加。烘焙冷杉的吸濕性降低程度高于烘焙白楊。接觸角的測試表明原木的吸濕性較烘焙木材明顯。本文還分析了烘焙過程中生物質(zhì)的脫碳、脫氫和脫氧現(xiàn)象。通過總色差和吸濕性降低程度發(fā)現(xiàn)三個指標表現(xiàn)出較好的相關(guān)性。同時，本文進行了關(guān)于改善生產(chǎn)的生物炭的疏水性的綜合研究，結(jié)果表明了生物炭的碳儲存和負二氧化碳排放的潛力。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