生物质两段式富氧气化-燃气轮机燃烧集成发电系统模拟研究

为实现生物质能量的高效清洁利用，本研究基于两段式富氧气化系统改进燃气品质，并将获得的洁净高热值可燃气用于燃气轮机燃烧。通过Aspen Plus模拟研究分析了氧体积分数、气化温度对气化特性、燃机运行特性的影响，研究结果证实了生物质气化燃气在燃气轮机应用的可行性，并发现氧体积分数提高对改善生物质气化燃气品质及系统发电效率具有重要意义。两段式气化二次气化温度提高会引起气化效率及系统发电效率下降，因此气化温度需控制在合适范围。在满足生物质灰分完全熔融液化分离的前提下，气化温度可取较低值；两段式气化系统可选择氧体积分数为50%~60%时较佳。在氧体积分数60%、气化温度1 200 ℃时，生物质气化-燃气轮机集成发电系统发电效率（η_t）达最优，为34%，此时生物质可燃气低位热值（Q_LHV）为9.54 MJ/m³，两段式气化效率（η_CGE）为78.65%。

Simulation Study of Biomass Two-stage Enriched Air Gasification-Gas Turbine Combustion for Power Generation

For the efficient and clean utilization of biomass energy, a two-stage enriched air gasification system was designed to improve the gas quality. The obtained clean high calorific combustible gas was used in gas turbine for power generation. The influence of the oxygen percentage of enriched air and secondary gasification temperature on the gasification performance and gas turbine operating characteristic were analyzed based on the Aspen Plus simulation. The results confirmed the feasibility of application of biomass gasification gas in gas turbines. And it was found that increasing oxygen percentage could efficiently improve the combustible gas quality and the system power generation efficiency. The secondary gasification temperature in the two-stage gasification system could cause slight decrease of gasification efficiency and power generation efficiency. Thus the gasification temperatue should be controlled in a reasonable range.When the gasification temperature was high enough for complete ash melting and separation, lower temperature could be chosen for saving energy. The optimum oxygen percentage of enriched air for two-stage gasification system was 50%-60%. When the oxygen percentage was 60% and the gasification temperature was 1 200 ℃, the power generation efficiency(η_t) reached maximum(34%), and the lower calorific value of the combustible gas was 9.54 MJ/m³ and the two-stage gasification efficiency(η_CGE) was 78.65%.