温度对马尾松热解产物产率和特性的影响

Pinus massoniana pyrolysis: influence of temperature on yields and product properties

马尾松Pinus massoniana是中国重要的速生人工林树种。采用热化学转化法,可制取生物质燃气、生物质炭和生物油等高品质燃料。采用固定床热解反应器,开展了热解温度(400,500,600和700℃)对马尾松慢速热解过程产物产率和基本特性的影响研究。结果表明:随着反应温度的升高,气体产率逐渐增加,炭产率和生物油产率逐渐减少;在700℃时,可燃气的最高热值为12.11 MJ·N^(-1)·m^(-3),气体成分及其体积分数为二氧化碳CO_2(24.00%),一氧化碳CO(25.00%),甲烷CH4(15.50%),氢气H_2(25.50%)和烃类气体CnHm(2≤n≤4)(0.97%);炭的最高低位热值和比表面积分为31.8 MJ·kg^(-1)和536.13 m^2·g^(-1);生物油中乙酸(5.30%),1-羟基-2-丁酮(4.11%),乙酰甲醇(8.46%),苯酚(2.66%)和甲基苯酚(3.87%)的相对含量最高。

Pinus massoniana, a fast-growing wood species that is plentiful in China, could be converted into high-quality bio-fuel through thermal-chemical conversion technology. The objective of this study was to obtain useful data for effective design and operation of biomass pyrolysis technology fed by P. massoniana. In this study a fixed bed reactor was used to determine the influence of temperature （400, 500, 600, and 700 ~C ） on yields and properties of slow pyrolysis products for P. massoniana. The components of bio-gas were analyzed by gas chromatograph （GC）, the properties of bio-char were analyzed by the Brunauer-Emmett-Teller （BET） and Barrett-Joyner-Halenda （BJH） methods, and the components of bio-oil were analyzed by gas chromatograph/ mass spectrometry （GC/MS）. Results showed that as the pyrolysis temperature increased, the yield of bio-gas increased from 40.00% to 46.50%; whereas, the yields of bio-char and bio-oil decreased from 26.50% to 24.00% and 33.50% to 29.50%, respectively. At 700 ~C, the lower heating value （LHV） of bio-gas reached its maximum value of 12.11 MJ.N-J .m-3 with components of C02 （24.00%）, CO （25.00%）, CH4 （15.50%）, H2 （25.50%）, and C,H,,, （2--.〈 n~〈4）（0.97%）; also the maximum values for LHV （31.8 MJ-kgq） and specific sur- face area （536.13 m2.gq） were attained. The main components in the bio-oil were acetic acid （5.30%）, 1-hy- droxy-2-butanone （4.10%）, hydroxy-acetone （8.50%）, phenol （2.70%）, and methylphenol （3.90%） which could be important chemicals source by refining .