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Aviation pollutants emmissions are a nowadays high concern. Biofuels can be used to reduce fossil fuels dependence, especially the ones that does not require adaptation of the fuel distribution network nor the engine fuel systems. A Computational Fluid Dynamics (CFD) simulation of a CFM56-3 combustor burning Jet-A and a 100% blend of biofuels, was performed. Viability of use of these biofuels was...
Biodiesel produced from rapeseed oil considered one of promising option in Romania for compression ignition engines due to the higher level of productions and environmental friendliness. In this work, biodiesel B20 is prepared from rapeseed oil (blends 20% Rapeseed methyl ester with 80 % Diesel volumetric fraction). The fuel is tested on a direct injection, four cylinders, four stroke Diesel engine...
For improving the load-following capacity of existing grate boiler units, an MPC control concept based on the combustion power soft-sensor is developed. Because the combustion power estimation has a very quick response to the primary air flow input, the load-following speed of the boiler control system will be improved considerably. The proposed MPC strategy is tested with the BioPower 5 CHP plant...
An efficient way to exploit the chemical energy contained in the biomass is combustion using the state-of-the-art grate-firing systems, one of the most competitive and market-proven technology being currently used in Europe for power production: electricity and/or steam for district heating, which are offered on the market with capacities that range from 20 up to 50 MWel. A decisive variable, when...
The paper presents an approach that is new for aviation-related ecology. The approch allows defining spatial distribution of pollutant concentrations released at engine ground running procedure (GRP) using full gas-dynamic models. For the first time such a task is modeled in three-dimensional approximation in the framework of the numerical solution of the Navier-Stokes equations with taking into account...
The fuel bed height sensor is a critical element in the control of the BioGrate boiler. A fault appearing in this sensor greatly affects the control performance in the sense that air distribution in the BioGrate boiler deviates from its nominal distribution. To address this problem, a fault tolerant model predictive control (FTMPC) has been developed to accommodate the fault in this fuel bed height...
The operation of modern biomass combustion plants with high efficiencies and low emissions requires advanced control strategies. In this paper the controller design for a medium-scale biomass furnace based on input-output-linearization is presented. A fourth order nonlinear model with four inputs and four outputs forms the basis for controller design. Due to a time-delayed input the stabilization...
Caustic and sintered magnesia are the main products of magnesite thermal treatment. Caustic magnesia is generated by decomposition of MgCO3 to MgO and CO2. Sintered magnesia is generated at high temperatures at which a liquid phase is produced. Caustic magnesia is broadly used product. Because of high basicity, MgO is very convenient for reduction of water and environment acidity. The production of...
Most of small-scale combustion devices firing biomass use control algorithms designed on the basis of an empirical experience. Very often, the on-off strategy is applied for heat output control linked with repetitive starts of the burning process which may be linked with some undesirable effects especially as far as emissions and efficiency are concerned. There are more reasons why such control solutions...
Maintaining economical and ecological optimal conditions in a biomass firing unit is a very complex task, due to the fuel heterogeneity on the one hand, the complex combustion and boiler dynamics on the other hand. One probably inevitable way to attain the aforementioned objectives is by advanced modelbased control, which requires a dynamic model of the process. In this work, mathematical modeling...
The gas turbine is an extremely important component for the automotive and aviation industry. It works by converting the energy obtained by fuel combustion into some form of mechanical power. Therefore, controlling the input fuel going to the turbine is an important aspect of the gas turbine system. Therefore, an efficient controller design is required which can control the rate of the fuel being...
The rapid development of sports has attracted much attention in the digital network today. People's health awareness and world intense sports competition makes sports records get more and more attention. The rapid development of computer and network technology provide various fields with a lot of convenience. In order to make computer technology serve the College Sports education better, this paper...
Biodiesel is an alternative fuel derived from vegetable oils, animal fats, or other sources, and it can be made into biodiesel blends by mixing with conventional diesel. To achieve optimal engine combustion as well as minimal emissions with biodiesel blends, on-board blend level estimation system is one of the prerequisites. The paper explores two possible approaches of estimation: 1) oxygen-based...
Although the last decade there is a remarkable trend towards green energy, thermal power plants still cover most of the energy production and will continue to do so in the near future. Consequently, it is important to apply methods reducing the gas emissions. Towards this goal, an innovative software application that improves the regulation of combustion parameters is presented in this paper. Data...
The rice husk is one of the most abundant renewable biomass energy sources, which is wastage in rice milling company in China. Aiming at the present situation which the high cost of paddy drying is disadvantageous to the popularization of paddy dryer, paddy drying unit of biomass energy model CHLD using rice husk as a heat source was designed, the composition and structure characteristics of the unit...
The combusition and emission simulation models are established with a CFD software on a small non-road air cool DI Diesel Engine fueled with bio-diesel and diesel. The expriment cylinder pressure curves are used to verifies the validity of the models. The simulation results show that the start of combustion time is advance 0.9°CA and the end of combustion is advance 2.5°CA at the same injection advance...
Micronized coal reburning is one of the most effective de-NOX technologies for its high NOX reduction efficiency and low operating cost. By numerical simulation and experimental study, NOX reduction efficiency influenced by the temperature and stoichiometric ratio in rich zone, the velocity and the particle size of reburning fuel during the coal reburning process in a one dimension furnace has been...
Data envelopment analysis (DEA) is effective to evaluate energy efficiency, but few studies use this technique considering carbon emissions. This paper measures Chinese industrial sector's energy efficiency considering carbon emissions based on the slack-based measure (SBM) model in 1997-2008. The results show that Chinese industrial energy efficiency is relatively low, the average scores (SBM-based)...
The influence of gases radiation on heat transfer coefficient was considered, and a model of heat transfer in oxy-fired CFB was set up. The model showed that the heat transfer coefficient was not changed greatly in oxy-fuel combustion, because the heat transfer was dominated by solids effects, which did not depend on the gas composition. Take a 440 t/h CFB as example, the size of CFB furnace under...
Numerical simulation was used to analyze three dimensional combustion flow for the annular combustor of a gas turbine. As to structure characteristic of gas Turbine combustor, the real combustion camber geometry with detailed features is represented. Numerical results for the reacting flow were obtained based on SIMPLE algorithm. the realize k -ε turbulence model, discrete ordinates method radiation...
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