【摘要】 通过对气化炉内反应的热力学模型构建和模拟,探讨了实现生物质定向气化为合成气(H2∶CO=2∶1) 的条件,以便使用该合成气直接合成液体燃料—甲醇.在考虑气化过程中物质平衡、能量平衡和化学反应平衡的 基础上,建立了生物质气化模型,并使用PASICAL语言及其外挂DELPHI程序,编写了FBGB程序,用于模拟生物 质、水蒸气输入量与产气中各种气体组分含量之间的关系.通过模拟,发现水蒸气与生物质输入速率的比值 (S/B)是影响H2/CO值的关键参数.模拟结果显示当其它反应条件确定时,S/B与H2/CO呈线性递增关系,通 过调节S/B,H2与CO的比例可以得到控制.更多还原

【Abstract】 Methanol and ethanol are the alternative fuels to gasoline in the future for they combust cleanly. Synthesis of them from biomass is an attracting and challenging subject. Much effort had been done to synthesize methanol by catalysts from H 2 and CO, especially when the ratio of H 2 to CO is 2 ∶1 (Syngas). So if the Syngas can be obtained from biomass gasification the route of biomass to liquid fuels will be simple. The purpose of the thermodynamics modeling of biomass gasification reported here is to study the optimal condition for Syngas production. A program named FBGB was written by PASICAL and DELPHI based on materials balance, energy balance and chemical reaction balance in the gasifier. There are several variable parameters such as the biomass component, the quantity of air, the velocity of input materials, and the temperature in the gasifier which can be input. After calculation of fifteen values such as the quantities of the product gases, both the heat values of the product gases and tar can be obtained. Using the program, the relationship of biomass input velocity, the steam input velocity and the component of product gas is simulated, and it is found that the ratio of input velocity of steam to input velocity of biomass (S/B) is the key factor to the ratio of H 2 to CO. When other conditions are fixed, the ratio has a direct proportion relationship to S/B. By adjusting S/B the ratio of H 2 to CO can be controlled to 2 ∶1, which is suitable to synthesize methanol. The comparision of the experimental results proves the validation of the modeling and the program.更多还原