Simulation of Pine Sawdust Gasification with Oxygen, Steam and Carbon Dioxide as Gasifying Agents
- 能源院－已发表论文 
以氧气-水蒸气-二氧化碳作为气化介质,松木屑为原料,采用Aspen Plus软件,结合自建模型,对生物质气化进行了模拟研究。首先,利用文献中的数据对模型进行了验证,模拟结果与文献中的数据基本吻合,证明了该模型的正确性。接着,考察了气化温度、氧气用量（c_（ER））、水蒸气与生物质质量比（m_S/m_B）、二氧化碳与生物质质量比（mCO2/mB）对产气组成、气体热值、气体产率、气化效率和产气氢碳比（n_（H2）/n_（CO））的影响。结果表明：在850℃、101.325 k Pa、c_（ER）=0.2、m_S/m_B=1、mCO_2/m_B=0.6的条件下,气化产物特性为气体热值7.45 MJ/m~3、气体产率1.78 m~3/kg、气化效率73.3%、氢碳比1.79。适当提高气化温度有利于气化。c_（ER）的增大使气体热值、产率和气化效率均迅速降低;但对产气中氢碳比的影响较小。此外,气化剂中水蒸气的适量增加有利于氢气的产生并能明显提高其体积分数,二氧化碳的适量增加有利于一氧化碳的产生并能在一定程度上提高其体积分数,二者均能有效调节产气的氢碳比。Using Aspen Plus software, a model was developed to simulate the gasification of pine sawdust with steam-oxygencarbon dioxide as gasifying agent. At first, the model was verified by the data of literature and the results showed that the model was reliable. And then,the effects of gasification temperature, oxygen equivalence ratio（ CER ） , the mass ratio of steam to biomass （ms/roB） as well as the mass ratio of carbon dioxide to biomass （mco2/mB ） on gas composition, low heating value, yield, gasification efficiency and H/C ratio （n.2/nco） in the produced gas were studied. The low heating value, yield, gasification efficiency and H/C ratio of the produced gas reached 7.45 M）/m3 , 1.78 m3/kg, 13.3 %, 1.79 respectively under the optimum reaction conditions of 850 ℃, 101.325 kPa, CER = 0.2, ms/mB = 1, mco2/mB = 0.6. Higher gasification temperature was favorable to the process of biomass gasification. With the increased CER, the low heating value, gas yield and gasification efficiency decreased rapidly,while H/C ratio was basically keeping stable. The amount of steam added into gasification agent enhanced H2 content in the produced gas ; while appropriate amount of CO2 added would improve the CO content. Therefore, either of the above two measures could effectively adjust the H/C ratio in the produced gas.