摘要
为妥善利用生物质秸秆和减少对传统能源利用方式的依赖,本文提出了玉米秸秆与煤共气化方案,利用Aspen Plus流程模拟软件对秸秆与煤共气化行为进行模拟研究,并对不同操作条件对合成气组分等因素进行了灵敏度分析,结果表明气化温度在750℃之前对模拟结果影响较大,气化压力和氧气流量的增加对模拟结果产生负面影响,而水蒸气流量对H2体积分数和产量有积极作用,故结合以上规律,以合成气产率为正交优化目标,通过极差分析得到最佳操作条件,将玉米秸秆与煤炭比例设置为40:60,气化温度设置为723℃,气化压力设置为1 bar,气化剂中氧气流量为200 kg·h−1,水蒸气补充流量为440.43 kg·h−1。得到最优模拟结果,产气组分中H2占比29.72%,CO占比20.18%,CO2占比6.49%,CH4占比0.298%,氢气产量为78.21 kg·h−1,气体产率2.923 Nm3·kg−1。
To effectively utilize biomass straw and reduce reliance on traditional energy sources, this study proposes a co-gasification scheme of corn straw and coal. The gasification behavior of straw and coal co-gasification is simulated using the Aspen Plus process simulation software. Sensitivity analysis is conducted on various operating conditions, focusing on the composition of synthesized gas. The re-sults indicate that gasification temperature has a significant impact on the simulation results below 750˚C. An increase in gasification pressure and oxygen flow rate has a detrimental effect on the simulation results, while steam flow rate has a positive influence on H2 volume fraction and yield. By integrating these observations, and considering synthetic gas yield as the orthogonal optimization objective, the optimal operational conditions are determined through range analysis. The corn straw-to-coal ratio is set at 40:60, gasification temperature at 723˚C, gasification pressure at 1 bar, oxygen flow rate in the gasification agent at 200 kg·h−1, and steam supplementation flow rate at 440.43 kg·h−1. The optimal simulation results yield gas components with H2 occupying 29.72%, CO occupying 20.18%, CO2 occupying 6.49%, CH4 occupying 0.298%. The hydrogen production rate is 78.21 kg·h−1, and the gas yield is 2.923 Nm3·kg−1.
出处
《建模与仿真》
2023年第6期5875-5886,共12页
Modeling and Simulation
