Simulation and energy consumption comparison of gas purification system based on elevated temperature pressure swing ads
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Simulation and energy consumption comparison of gas purification system based on elevated temperature pressure swing adsorption in ammonia synthetic system Zhiming Liu1,2 · Peixuan Hao1,2 · Shuang Li1,2 · Xuancan Zhu1,2 · Yixiang Shi1,2 · Ningsheng Cai1,2 Received: 31 August 2019 / Revised: 1 February 2020 / Accepted: 13 March 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Elevated temperature pressure swing adsorption (ET-PSA) is a novel process for hydrogen purification. By operating steam rinse and purge at conditions beyond the dew point will significantly improve the recovery rate of the product gas. Moreover, since cooling and reheating processes are not needed in ET-PSA, the sensible heat of the incoming gas could also be preserved. In this study, a seven-column 5000 N m3/h ET-PSA pilot scale model was designed for energy consumption analysis. Product H 2 purity, recovery rate, product C O2 purity, CO2 capture rate, unit H 2 purification energy consumption and unit C O2 capture energy consumption were set as the criteria for assessing the purification performance. Rinse pressure, rinse media, and desorption method were selected as variables during the design and optimisation of the ET-PSA process. Herein, a high process efficiency (99.98% product gas purity and 99.33% recovery) was achieved. These values increased by 5.38% and 4.44%, respectively, compared to the base case. Meanwhile, the CO2 capture energy consumption was reduced by 59.2 MJ/ton(CO2). Keywords Pressure swing adsorption · Energy consumption comparison · Gas purification · Rinse
1 Introduction The coal-to-syngas process is mainly based on units of air separation, coal gasification, water–gas shift, desulphurisation, decarbonisation, and possible subsequent units for syngas use, such as, e.g., synthesis of ammonia (Cal et al. 2000), Fischer–Tropsch synthesis (Delgado et al. 2015), and processes for energy production as IGCC (integrated gasification combined cycle) (Zhu et al. 2016a, b), IGFC (integrated gasification fuel cell), and fuel cells application (Veras et al. 2017). A typical process is shown in Fig. 1. The crude syngas exiting the gasifier is sent to the water–gas
* Shuang Li [email protected] * Yixiang Shi [email protected] 1
Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China
Shanxi Research Institute for Clean Energy, Tsinghua University, Taiyuan 030032, Shanxi Province, China
2
shift (WGS) unit to adjust the proportion of carbon monoxide to hydrogen according to the downstream demand, where the temperature of the outlet gas is between 200 and 400 °C (McDowall and Eames 2006; Gazzani et al. 2013; Andersson and Lundgren 2014; Anna et al. 2016; Gao et al. 2017). Subsequently, the syngas is sent to desulphurisation and decarbonisation and then exits at around 200 °C, ready for further applications (Theo et al. 2016). A high purity of the product syngas
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