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a two-bed guard bed used to remove organic tar species from the raw syngas, an electrically classified compressor for compression of the clean sour syngas to ~350 psig, and an air cooled cooler/knockout assembly for rejecting water and other condensables from the sour syngas. This gas was then passed to the sour PSA skid where it entered one of two PSA vessels containing adsorbent for the removal of sulfur species and CO2. The cleaned gas exiting the PSA was characterized (flow, composition) and vented to the NCCC thermal oxidizer. Each bed was cycled through the predetermined PSA cycle steps. During the regeneration steps the bed was depressurized, purged with product gas at atmospheric pressure, and then re-pressurized with product gas. Gas exiting the bed during regeneration was also characterized and vented to the thermal oxidizer. The PSA product gas composition was monitored during cycling. Once stable, the inlet and outlet gas flows / compositions and column pressure/temperatures were measured during one cycle to provide data for comparing with process simulations. Summary of Campaign A set of CH4 and H2S breakthrough tests were conducted on each of the PSA beds before syngas was introduced to the unit. The fresh adsorbent capacities were in line with the expected values from previous isotherm measurements. Feed of sour syngas to the system was started on 10/8/2014 at 10AM. The sour syngas passed through the guard beds where organic tars were adsorbed. We monitored progression of the tars through the bed by measuring the benzene level in the inlet and outlet syngas. The inlet level was typically around 300 ppm (molar basis) and no evidence of benzene was ever detected in the guard bed effluent gas.The guard bed does a great job of eliminating tar species from the sygnas stream. H2S is also removed from the gas by this adsorbent. Our previous experience at the Energy and Environmental Research Center suggested that breakthrough of H2S from the guard beds would take about 2-5 days. Instead, in part due to the much lower H2S level in the feed gas (~300 ppm compared to 2400 ppm), the breakthrough time was much longer. After 8 days on sour syngas, we decided to accelerate the breakthrough of H2S by feeding 0.5% H2S/He cylinder gas to the unit at atmospheric pressure, thereby loading the adsorbent withPDF Image | Air Products Pressure Swing Adsorption at the National Carbon Capture Center
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