Abstract:

Aiming at the increased operation cost problem resulted from excess oxygen added in supercritical water oxidation(SCWO) systems, a set of oxygen recycling process using cold energy of liquid oxygen for the implementation of oxygen recycling and the recovery of industrial-level CO₂ has been presented. The results show that for a 100 t/d SCWO system, the construction investment of oxygen recycling is about CNY 1400000 and its yearly earnings are about CNY 2070000. The construction investment can be recovered after the system has run for eight months. The process can effectively recycle the excess oxygen in SCWO system and recover liquid-phase industial-level CO₂, simultaneously, which further improves the SCWO economical efficiency and has remarkable economic superiority.

Key words: supercritical water oxidation, oxygen recycle, economic efficiency

摘要：

针对超临界水氧化(SCWO)系统中过量氧加入带来的运行费用增高问题,提出了一套利用SCWO系统中液氧冷能实现氧回用并回收工业级CO₂的氧回用工艺。结果表明,对于处理100 t/d废水的SCWO系统,氧回用工艺投资约140万元,年收益约207万元,系统运行8个月即可收回投资。该工艺可有效回用SCWO系统中过量氧,并回收工业级液态CO₂,进一步提高了SCWO系统经济性,具有显著的经济优势。

关键词: 超临界水氧化, 氧回用, 经济性

CLC Number: 

• X703