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A Combined Heat and Power (CHP) system fuelled with rice husk is analysed from the thermodynamic, exergetic and economic point of view. The system is based on a gasification process coupled with a rice drying system. The produced syngas is employed to power a Spark Ignition (SI) Internal Combustion Engine (ICE) working as an electric generator, while the jacket cooling water powers a bottoming Organic...
Biomass gasification for the release of a syngas and its use in combined heat and power (CHP) generation systems are attracting realities in the European market, due to the perspective to provide energy to remote districts by using local renewable sources, as residuals of forest practices or agro-food industries. The syngas produced from biomass gasification is a feasible alternative to traditional...
The effects of splitting the injection event in a GDI (gasoline direct injection) engine operating with a HOS (homogeneous stratified) lean charge are analysed through experimental and numerical techniques. Injection is assumed as divided in two parts, each delivering the same gasoline amount, the first occurring during intake, the second during compression.The work is initially focused on the experimental...
Wastewater treatment plants are high energy-consuming systems, and their electric energy consumption contributes to 25–30% of the total operating costs. A significant part of thermal energy is needed for management of the sludge produced during the process. Sludge drying by Combined Heat and Power (CHP) systems is attractive to obtain substantial economic and energy savings, especially if all the...
The thermochemical behavior of three raw and respective solvent extracted (ultrasound assisted) microalgae species – CV (Chlorella vulgaris), SC (Scenedesmus obliquus) and NOc (Nannochloropsis oculata) – was studied in order to evaluate their potential as fuels. Thermograms were obtained for four heating rates (5–25 °C/min). The results reveals that (i) for all microalgae thermal degradation processes...
The electricity production in S. Vicente is based on fossil fuel and wind power and, although there are significant wind resources, they are not fully used because of its intermittent nature. In a previous work, we proposed solutions to tackle this issue. Since this island does not have fresh water available, excess wind power can be provided to desalination units to produce desalinated water to supply...
A comparison between two numerical models describing the thermo-chemical conversion process of a solid fuel bed in a grate-fired boiler is presented. Both models consider the incoming biomass as subjected to drying, pyrolysis, gasification and combustion. In the first approach the biomass bed is treated as a 0D system, where the thermo-chemical processes are divided in two successive sections: drying...
The analysis of the mixture formation and early combustion processes in a slightly lean burn gasoline direct injection (GDI) engine is performed by using experimental and numerical techniques. UV–visible natural emission digital imaging is applied in the optically accessible combustion chamber of a research engine. This is equipped with the four-valve head and the same injection system of a commercial...
As the interest for energy recovery from waste incineration has increased over the years, concern for the impact such processes have on the environment has also grown. To reduce such an impact, the legislation enforced in Italy and Europe imposes important restrictions on the temperature of the exhausts in the combustion chamber, which must be kept above certain values depending on the type of waste...
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