Simulation Study On Liquid Fuels Synthesis Of Syngas From Biomass

The declining of traditional energy resources reserves and deteriorating environmental conditionals have caused widespread human sense of crisis. The development of clean and environment-friendly renewable energy sources must be carry on whether take into account the demand from the state or individual point of view.As the only variety of renewable energy which can be transformed into liquid fuels, the utilization of biomass has received public attention and its development speed that amazed the world. Based on the analysis of a large number of relevant literature and the combination of small-scale entrained flow gasification of biomass plant, a thermodynamic model of DME synthesis from biomass gasification is established to carry out the gasification synthesis optimization of the coupled system.Ten kinds of common materials including food crops, forest plants, cotton crops, algae, organic waste as well as traditional coal is selected for the simulation of gasification using Gibbs free energy method. It is found that high O content of biomass feedstock will result in the optimal gasification temperature lower compared to coal, and microalgae with a higher H-content and lower O content is slightly better in this regard than terrestrial plants. The impact of CO2and water vapor additives in high-temperature gasification conditions on the effective gas content is not obvious, but it can play a regulatory role of hydrogen-carbon ratio.In order to explore the suitable process of gasification of biomass feedstock for DME synthesis, four paths are chosen for the simulation study. Calculation showed that the optimal gasification temperature exist, too high or too low of gasification temperature will affect the yield of DME. We also found that the power consumption of compression impact on system efficiency about1.2%, and torrefaction can improve system efficiency of1.9%and6%of dimethyl ether yield. By comparison with the non-transformation process, we found that the set of transform part can reduce the effective energy loss of the gasification process.In the experimental study of sulfur content of gas from high-temperature gasification of biomass, we found that sulfur content be peak below1000℃, and as the temperature continues to rise then decline rapidly which indicating high temperature is conducive to the removal of pollutants; When the gasification agent of O2leads to increased, then the sulfur content increases, showing that in permitting reduced the amount of gasifying agent helps to reduce the formation of sulfur emissions. In additional, the experiments of removal of trace amounts of H2S gas by activated carbon show that by the surface film of water through the alkaline environment and provide for the active center the activated carbon sulfur content can be increased, so that it has better removal features.