Comparative analysis of cryogenic and PTSA technologies for systems of oxygen production

Abstract

Abstract. Development of oxy-combustion technology requires relatively lower purity oxygen production (90 -95% O 2 ). There are two known methods to produce oxygen in such purity level -cryogenic and sorption. Cryogenic air separation technology is currently well developed and widely used for oxygen production in large quantities (up to 5 000 tons per day from a single technology train). The second method is pressure swing adsorption (PSA), which is well suited for smaller quantities of oxygen (below 500 tons per day). To optimize overall energy consumption, the PSA method can be combined with swing of temperature by using waste heat from combined heat-power generation (cogeneration) processes, leading to pressure temperature swing adsorption (PTSA). In small and medium scale oxygen production systems for oxy-combustion, both PTSA and cryogenic method can be used. The paper shows calculations and experimental validation of the efficiency and economics for both processes. The limitations of applicability for each of these technologies are indicated. The possibility of coupling the technologies, including thermal power plants, in order to improve the efficiency of the oxygen separation is discussed.

A‐ and B‐site Codoped SrFeO3 Oxygen Sorbents for Enhanced Chemical Looping Air Separation

“…At present, a vast majority of oxygen is obtained by cryogenic air separation, which compresses and liquefies air, followed by distillation to afford oxygen and nitrogen. Although the cryogenic method is capable of producing high‐purity oxygen (i.e., >99 %) at a large scale (up to a thousand tons per day), the process is both capital and energy intensive (≈0.24 kWh kg −1 O 2 ), and has limited thermodynamic second law efficiency (<25 %), owing to the inherent efficiency limitations in the compression and fractionation steps . In light of these reasons, there is a clear need for more efficient means for air separation.…”

“…Owing to its simplified operation and fast cycle time, PSA has been increasingly used for small‐scale air separation. However, it is not suitable for production of high‐purity oxygen as the oxygen purity is limited to around 95 % . In contrast, ceramic membranes, including oxygen conductive membranes and mixed ionic–electronic conductive (MIEC) membranes, are capable of producing high‐purity oxygen.…”

Sr1-xCaxFe1-yCoyO3-δ as facile and tunable oxygen sorbents for chemical looping air separation

“…PSA is based on selective adsorption of nitrogen over oxygen on a zeolite sorbent surface, due to surface charge on sorbent surface and nitrogen being more polarizable comparing to oxygen. The technology, however, is less efficient than cryogenic air separation and oxygen purity is generally limited (< 95%) [5].…”

Bioh2, Heat and Power from Palm Empty Fruit Bunch via Pyrolysis-Autothermal Reforming: Plant Simulation, Experiments, and CO2 Mitigation

“…The ATR oxygen demand for both processes is calculated to be 1709 kg/h (41.0 ton per day or 'TPD') and 3418 kg/h (82 TPD), respectively. Considering both values correspond to production from a mid-size ASU (less than 100 TPD), the energy cost of producing oxygen by either a cryogenic or non-cryogenic process will be almost the same with a slight advantage for non-cryogenic process [49]. The additional power consumed by the ASU is calculated for each process and added to the value of .…”