Matteo Gazzani

The results of pressure-swing adsorption experiments performed in a two-column setup are presented, as a way of validating a model developed to design and optimize cyclic adsorption processes. The experiments were conducted using a commercial activated carbon as the sorbent and an adsorption pressure of 20 bar. Two feed mixture compositions were studied: a binary CO 2 /N 2 mixture representative of a flue gas and a ternary CO 2 /N 2 /H 2 mixture representative of the product stream of air-blown… Meer weergeven

The results of pressure-swing adsorption experiments performed in a two-column setup are presented, as a way of validating a model developed to design and optimize cyclic adsorption processes. The experiments were conducted using a commercial activated carbon as the sorbent and an adsorption pressure of 20 bar. Two feed mixture compositions were studied: a binary CO 2 /N 2 mixture representative of a flue gas and a ternary CO 2 /N 2 /H 2 mixture representative of the product stream of air-blown autothermal reformers. During the experiments, the temperature was measured at five locations along the center of each column, along with the pressure, feed flow rate, product composition, and high-pressure product flow rate. A one-dimensional, nonisothermal, nonequilibrium model was used to simulate the experiments in a fully predictive manner. This model was previously validated in breakthrough experiments as well as PSA experiments using a binary CO 2 /H 2 mixture. A thorough analysis of the experimental results and comparison with the simulation results showed that the model is fully capable of handling rather different feed compositions while still predicting satisfactorily the temperatures within the column, the product composition, and the overall process performance for a variety of process configurations and operating conditions. Minder weergeven

The paper presents an analysis of the operating parameters of the Combined Cycle Gas Turbine (CCGT) systems in Italy in the years from 2006 to 2013, studying the environmental and economic impact of renewable energy sources spread on CCGT. Variable Renewable Energy (VRE) sources development, electricity demand reduction and CCGT overcapacity have affected the CCGT systems that have had to operate at partial load, experiencing several rump-up/down cycles in a day. The consequent increase of CO2… Meer weergeven

The paper presents an analysis of the operating parameters of the Combined Cycle Gas Turbine (CCGT) systems in Italy in the years from 2006 to 2013, studying the environmental and economic impact of renewable energy sources spread on CCGT. Variable Renewable Energy (VRE) sources development, electricity demand reduction and CCGT overcapacity have affected the CCGT systems that have had to operate at partial load, experiencing several rump-up/down cycles in a day. The consequent increase of CO2 emission and costs have to be considered in a RES high penetration future scenario. The paper aims to evaluate the net avoided emissions by RES and the cost that Italy have incurred to avoid to emit a tonne of CO2. To reach the high penetration of RES targets the attention is switching from the problem of adding more renewable energy installations to the problem of managing the whole “green” electricity production in a smarter way. Considering all the indirect effects caused by RES on the electricity system is essential for everyone who wants to analyse future scenarios. Minder weergeven