高热值板栗壳基生物质炭的制备(英文)

Preparation of a biochar with a high calorific value from chestnut shells

生物质材料的再利用是缓解能源问题的有效方法。板栗壳作为一种富含纤维素、半纤维素和木质素的生物质材料,直接燃烧的热值很低。本文通过催化、预氧化及炭化3个过程,制备了板栗壳基生物质炭,并研究了在炭化过程中板栗壳的热解行为、结构和性能的转变。结果表明,炭化温度影响板栗壳基生物质炭的产率和热值。在750℃时,板栗壳基生物质炭有44.31%的产率,并且热值高达35.48 MJ/kg,明显大于一级精煤30 MJ/kg。

The recovery of biomass provides a solution for solving the energy shortage problem.Chestnut shells consist of cellulose,hemicellulose and lignin,and have a low calorific value.We propose a method to produce a biochar with a high calorific value from chestnut shells by catalytic pre-oxidation and pyrolysis with sulfuric acid and urea.The pyrolysis behavior and the changes in structure and properties were investigated.Results indicate that the catalysts slow the pyrolysis reaction,leading to a high-quality char.The carbon content and calorific value are related to the pyrolysis temperature.When the chestnut shells are pyrolyzed at 750℃,the yield and calorific value of the char are 44.31 wt%and 35.48 MJ/Kg,respectively.The calorific value of the char is higher than that of first-level cleaned coal(30.00 MJ/Kg).