气流床煤气化系统的热力学分析

Thermodynamic analysis of entrained-flow coal gasification system

在使用Aspen Plus对激冷型气流床煤气化系统进行模拟和优化的基础上,采用热力学分析方法,对气化系统进行了能量衡算和量衡算。计算结果表明,系统中损失最大的过程是化学能转变为物理能的过程。洗涤冷却室是损失最大的设备,损失占了总的21.2%;其次是气化炉气化室,占到了总的13.9%,气化室的损失主要发生在水的汽化等过程中,这一部分损失占气化过程损失的70%左右,而氧气加热至反应温度所带来的损失仅占30%左右。采用分析方法可以更准确地揭示系统中损失最大的环节和过程,为改进设备、节约能源提供目标和对策。

Based on the simulation and optimization results of quenching entrained-flow coal gasification process with Aspen Plus, thermodynamic analysis was applied to calculate energy distribution and exergy distribution of the gasification system. The results show that the process with the maximal exergy loss is chemical energy transforming into physical energy. The equipment with the maximum exergy loss is scrubbing-cooling chamber, sharing 21.2% of total input exergy; the second is gasifier, with exergy loss sharing 13.9%, and 70% of exergy loss in gasifier root in vaporization of water, the temperature rise of oxygen result in the other 30%. By using exergy analysis method, it can be more accurate and convenient to uncover the process with the maximal exergy loss so as to set up target and provide suggestion of equipment rebuilding and energy saving.