摘要
目的：研究吸附压力、解吸压力等工艺参数对快速真空变压吸附（RVPSA）制氧性能的影响。方法：搭建RVPSA制氧实验装置，实验确定吸附和解吸压力为240kPa和60kPa时RVPSA制氧过程中用于出气端充压的较合适的中间气压力和浓度，测得产氧浓度、产氧量等性能参数；在此基础上改变RVPSA循环的吸附和解吸压力，重复上述实验。结果：①有中间气充压的RVPSA循环的产品气的氧体积分数比无中间气充压的RVPSA循环的高15．85％。②吸附及解吸压力比为4的RVPSA循环回收率比压力比为3的回收率高约5％；吸附及解吸压力比为4时，解吸压力为60kPa的回收率比解吸压力为80kPa的回收率高1％-3％。③吸附及解吸压力比为4的RVPSA制氧系统床层因子比压力比为3的系统床层因子低约25kg／TPD，吸附及解吸压力比为4时，解吸压力为60kPa的床层因子比解吸压力为80kPa的床层因子低6kg／TPD。结论：RVPSA制氧过程中，中间气出气端充压可以有效提高RVPSA制氧过程产氧浓度。在较大的吸附及解吸压力比下，RVPSA制氧循环的回收率较高，且床层因子较小。吸附及解吸压力比相同时，解吸压力越低，RVPSA制氧循环的回收率越高，床层因子越小；且在吸附及解吸压力比较大时，该差异更明显。
Objective： To study the effects of adsorption and desorption pressure on the performance of oxygen generation process by rapid vacuum pressure swing adsorption （RVPSA）. Methods： The RVPSA experimental facilities were set up. At the adsorption pressure of 240 kPa and the desorption pressure of 60 kPa, the experiment determined the appropriate pressure and oxygen purity of pressurization intermediate gas by measuring the oxygen purity and flow rate of the product using oxygen analyzer and flow meter, respectively. Then we changed the adsorption and desorption pressure of the RVPSA process and repeated the above steps. Results： （1） the oxygen purity of the product by the RVPSA cycle with intermediate gas pressurization reached 90.3%, which was improved by 15.85% compared with the RVPSA cycle without intermediate gas pressurization. （2） When the ratio of adsorption and desorption pressure was 4, the oxygen recovery rate was higher by 5% compared with that when the ratio of adsorption and desorption pressure was 3; when the ratio of adsorption and desorption pressure was 4, the oxygen recovery rate of 60 kPa desorption pressure was higher by 1%- 3% compared with that of 80 kPa desorption pressure. （3）The bed size factor when the ratio of adsorption and desorption pressure was 4 was lower by 25 kg/TPD compared with that when the ratio of adsorption and desorption pressure was 3; when the ratio of adsorption and desorption pressure was 4, the bed size factor of 60 kPa desorption pressure was lower by 6 kg/TPD compared with that of 80 kPa desorption pressure. Conclusion： Pressurization with intermediate gas via the product end can effectively improve oxygen purity of the product. By increasing the ratio of adsorption and desorption pressure, the oxygen recovery in the process of RVPSA cycle can be improved, and the bed size factor of the RVPSA system can be effectively reduced as well. And when the ratio of adsorption and desorption pressure was the same, the more perfect process performance can b
作者
刘应书
祝显强
杨雄
刘文海
LIU Ying-Shu ZHU Xian-Qiang YANG Xiong LIU Wen-Hai(School of Energy and Environmental Engineering, Beijing University of Science and Technology, Beijing 100083, China)
出处
《医用气体工程》
2016年第1期21-24,共4页
Medical Gases Engineering
关键词
变压吸附
空气分离
制氧
充压
pressure swing adsorption
air separation
oxygengeneration
pressurization
