文献类型：期刊文献

英文题名：Pyrolysis behaviors of five agricultural wastes with a focus on liquid product

作者：Wan, Shiqi[1]; Zheng, Nan[1]; Zhang, Jie[1]; Wang, Jie[1]

机构：[1] Department of Chemical Engineering for Energy, Key Laboratory of Coal Gasification and Energy Chemical Engineering of Ministry of Education, East China University of Science and Technology, 130 # Meilong Road, Shanghai, 200237, China

年份：2018

外文期刊名：2018 International Pittsburgh Coal Conference, PCC 2018

收录：EI(收录号：20192607115850)

语种：英文

外文关键词：Chemical reactors - Inert gases - Lignin - Biomass - Hydrocarbons - Agricultural wastes - Catalysis - Cellulose - Mass spectrometry - Gas chromatography - Carbon - Cotton - Ionization of gases - Liquids

摘要：Agricultural waste is an important biomass energy source because of its abundant availability, renewability, non-conflict with the food chain, and environmental gain. Pyrolysis is an efficient way to convert biomass to higher grade products including gas, bio-oil and bio-char via thermal treatment. The purpose of this study is to investigate the pyrolysis behaviors of five agricultural residues (peanut straw, cotton straw, sorghum stalk, corn stalk and reed) using a gas-sweeping fixed-bed reactor. All biomasses were collected from a rural village in Lian Yun Gang city, China. The study is focused on the different compositions of these biomasses and their relationships with pyrolysis products, especially liquid product. Pyrolysis was carried out in an inert gas stream at a heating rate of 10 °C min-1 from room temperature to 700 °C. GC-TCD (gas chromatography equipped with thermal conductivity detector) was used to determine the main gases (CO2, CO, H2 and CH4). GC-FID (flame ionization detector) was used to determine hydrocarbon gases (C2–C3) and some typical liquid compounds. GC-MS (mass spectrometry) was used to characterize liquid compositions. The fiber analysis showed that peanut straw had the highest content of neutral extractives, and reed and cotton straw had the highest contents of cellulose and hemicellulose, and corn stalk and sorghum stalk was the most enriched with lignin. The pyrolysis results showed that the yields of bio-oil (water-excluded, dry biomass basis) were 31.5%, 27.6%, 28.0%, 24.9%, 24.3% for reed, sorghum stalk, corn stalk, cotton straw and peanut straw, respectively. It was interesting to see from GC-MS analysis that the bio-oils derived from sorghum stalk and corn stalk contained a higher proportion of long-chain fatty compounds including hydrocarbons and oxygenates (mainly unsaturated C16 and C18 acids), distinct from three other biomass species. These two bio-oils also had higher proportions of guaiacols, indicating a correspondence to their higher contents of lignin. The bio-oil derived from reed stalk showed the highest proportion of furfural and saccharides, in line with its highest content of cellulose and hemicellulose. Peanut straw produced the highest gaseous products (especially high for CO2) and the lowest yield of bio-oil. The bio-oil derived from peanut straw was composed of many nitrogenous compounds. Quantitative analysis by GC-FID demonstrated that peanut straw had the higher yields of both BTX (benzene, toluene and xylene), while sorghum stalk and corn stalk had the higher yields of PCX (phenol, cresol and xylenol). In the presentation, we will further report on the contents of alkali and alkaline earth metals (K and Ca) inherent in the five biomass species and their effects on the pyrolysis behaviors. Copyright ? 2018 Pittsburgh Coal Conference.