Current Issue : April - June Volume : 2019 Issue Number : 2 Articles : 5 Articles
In this study, we examine the behavior of a propane diffusion flame with air in a burner; the\ncomputational investigations are achieved for each case employing the Fluent package. The graphs\ngenerated illustrate the influence of flow parameters, the effects of the oxygen percentage in the air,\nand the effects of the equivalence ratio.................
Biomass obtained from cultivated energy crops is one of the raw materials with the highest\npotential in renewable energy production. Although such biomass can be used in production of\nlignocellulose bioethanol, it is currently mostly used as solid fuel for generating heat and/or electric\nenergy via combustion processes. Calorific values, proximate and ultimate analysis, cell structure\nand micro- and macro-elements data are considered as basic parameters in the valorization of fuel\nproperties during biomass combustion processes. Energy crops are cultivated with the aim to produce\nthe largest possible quantity of biomass with minimal agro-technical inputs. One of these crops is\nSida hermaphrodita (L.) Rusby. Given the fact that the chemical composition of biomass is influenced by\na number of agro-ecological and agro-technical factors, the aim of this work was to determine the fuel\nproperties of Sida hermaphrodita biomass obtained from three different harvest seasons (autumn, winter\nand spring) and cultivated in the area of the Republic of Croatia. On the basis of these investigations\nit was possible to conclude that harvest delaying towards spring season had a positive impact on\nsuitability of using biomass of Sida hermaphrodita in the combustion process, which primarily means\nsignificant lowering the contents of moisture (18.64%), ash (1.94%), and nitrogen (0.65%), but also\nmeans increasing the contents of fixed carbon (6.21%) and lignin (25.45%)....
Coal-fired plants are under pressure to reduce their carbon-intensity. Available\noptions include co-firing CO2-neutral biomass, oxy-fuel-combustion as\npart of a carbon capture process or a combination of both to give a\nâ??CO2-negativeâ? power plant. BioCCS, the combination of CO2 Capture and\nStorage (CCS) with sustainable biomass conversion, is the only large-scale\ntechnology that can achieve net negative emissions. Combining, developing\nand demonstrating the oxy-combustion of high ratios of sustainable biomass\nwith coal in flexible circulating fluidized bed (CFB) boiler will bring significant\nadvances in the reduction of greenhouse gases (GHG) emissions. Areas\naddressed include possibilities for: biomass characterization; handling and\nfeeding; co-firing ratios definition; CFB oxy-co-combustion studies; combustion\nperformance; boiler flexibility in fuel and load; main emissions analysis;\nslaging, fouling and agglomeration; corrosion and erosion; and implications\non plant operation and associated costs. The article will detail a comprehensive\nunderstanding on sustainable biomass supply, co-firing ratios and\nhow direct biomass co-combustion under oxy-fuel conditions can be implemented.\nIt seeks to push biomass co-combustion in future large-scale oxy-fuel\nCFB power stations to high thermal shares while enhancing the power plantsâ??\noperational flexibility, economic competitiveness and give operational procedures.\nThere will be a need to consider the public acceptance of power\nproduction from coal and coal sustainability, by its combination with renewable\nsources of energy (biomass)....
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