Coupling an oxygen generation cycle with an oxy-fuel combustion spark ignition engine for zero NOx emissions and carbon capture: A feasibility study

Abstract

[EN] An oxycombustion spark-ignition engine coupled to an production cycle based on a mixed electronic-ionic ceramic-type membrane is studied in this paper. The exhaust gases drive oxygen production through a heat exchanger network and a set of turbochargers. Initially, a study at medium speed is carried out to determine the influence of the oxygen concentration and the engine compression ratio on the system performance. A 16.3 % of fuel consumption reduction is reached when 30 % of mass fraction and an engine compression ratio of 20 are implemented when compared with conventional engine operation. Then, a full load study in a wide range of engine speeds is performed, where a maximum fuel consumption reduction of 21 % is obtained at high speed (5000 rpm) comparing with conventional engine operation. The study shows the whole cycle has demonstrated promising performance parameters at different working conditions ( mass fraction, compression ratio, engine load and speed).