(585e) Power Production through an Ammonia Based Combined Cycle
Different chemicals have been proposed as energy carriers. Hydrogen is one of the most extended due to its high energy density. However, its storage is difficult and expensive. Therefore, alternative chemicals have been proposed as hydrogen resources. Methanol or dimethyl ether (DME) has been used combining carbon dioxide and hydrogen. Ammonia is also attracting attention due to the possibility of producing it using hydrogen and nitrogen. Consequently, ammonia is a carbon free energy carrier. There are two main steps to use ammonia as an energy carrier: production using renewable power and its transformation into power. In previous works, the production of ammonia using renewables energies and raw materials have been studied using a process design perspective (Sánchez & Martín, 2018). Different alternatives have been proposed to generate power using ammonia. Three are the main ones (Valera-Medina et al., 2018): fuel cell using ammonia, ammonia cracking to produce hydrogen and, then, a hydrogen fuel cell and, finally, the ammonia combustion.
In this work, the ammonia transformation into power have been studied. The evaluation of the combustion way has been carried out. According to previous experimental works, the combustion of only ammonia is difficult and different mixture of ammonia with methane or hydrogen have been proposed. Therefore, a mixture of ammonia and hydrogen has been used in this work (Otomo et al., 2018). The hydrogen is produced from ammonia through cracking. Then, the mixture of hydrogen and ammonia is introduced in the combustion chamber to produce energy. A combined cycle is set up to obtain the power. The first stage is the gas turbine. Then, the Rankine cycle is introduced. Three turbines which different pressure are used in this cycle. The outlet gases are treated to meet the legislation about emissions (mainly nitrogen oxides) and to recover the valued products in the outlet stream. An equation based approach have been used to optimize the operating conditions of this process to produce power from renewable ammonia (temperature, pressure, ratios...).
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