A novel strategy to produce ultrapure hydrogen from coal with pre-combustion carbon capture

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Abstract

Integrated Gasification Combined Cycles (IGCCs) are one of the emerging clean coal technologies which paves the way for producing power from coal with a higher net power efficiency than conventional PC-fired boiler power plants. It is also advantageous that in an IGCC power plant a carbon capture unit can be applied to a stream having a very high CO2 partial pressure upstream of gas combustion that would not be available in case of a PC-fired boiler power plant, leading to less energy penalty involved in the carbon capture. In this study it is aimed to design a cogeneration process where a Hydrogen Pressure Swing Adsorption (H2 PSA) unit is retrofitted to an IGCC power plant with pre-combustion capture for producing ultrapure hydrogen (99.99+ vol%). The ultrapure hydrogen is commonly utilised as feedstock for deep desulphurisation and hydrocracking units at refineries as well as H2 fuel cells. It is found that, at the same H2 purity of 99.99+%, the hydrogen recovery could be improved up to 93% with the increasing number of columns. Improving the H2 recovery at the H2 PSA to its maximum can contribute to reducing the power consumption for compressing the H2 PSA tail gas by minimizing the yield of the H2 PSA tail gas by-product. Furthermore, it is demonstrated that the H2 PSA can also be designed to achieve 90% H2 recovery even when a portion of the tail gas is recycled to the shift reactors in order to improve the overall advanced IGCC performance by increasing the H2 yield and by reducing the auxiliary power consumption at carbon capture unit.

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APA

Luberti, M., Friedrich, D., Ozcan, D. C., Brandani, S., & Ahn, H. (2014). A novel strategy to produce ultrapure hydrogen from coal with pre-combustion carbon capture. In Energy Procedia (Vol. 63, pp. 2023–2030). Elsevier Ltd. https://doi.org/10.1016/j.egypro.2014.11.217

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