Zuwala J.,Institute for Chemical Processing of Coal |
Zuwala J.,Central Mining Institute of Poland |
Ziebit A.,Institute of Thermal Technology
Proceedings of the 23rd International Conference on Efficiency, Cost, Optimization, Simulation, and Environmental Impact of Energy Systems, ECOS 2010 | Year: 2010
The paper presents the application of thermoecological cost methodology as a sustainability measure for biomass co-firing technologies coupled with co-generation of electricity and heat. For both kinds of fuels; fossil fuel (hard coal) and biomass (willow chips) the value of thermoecological cost has been calculated. These parameters have then been used for the evaluation of the thermoecological cost for electricity and heat generated in CHP plant with a backpressure turbine. The change of these values along with the increasing energy share of biomass in the combusted blend has been analyzed. It was observed that biomass addition leads to the decrease of the thermoecological cost of electricity and heat generated in co-firing processes.
Bulinski Z.,Institute of Thermal Technology |
Kaczmarek K.,Silesian University of Technology
Indian Journal of Engineering and Materials Sciences | Year: 2014
The pneumatic powder injection is well-known and widely used with injection lances submerged into metal bath. However, sometimes better is to not introduce the lance below the liquid metal surface because of the metal splashing and introducing of gases into metal volume. In such a case non-submerged lance is used but the problem with particles jet penetration into the metal volume appears. This paper presents the results of the studies on the pneumatic powder injection with non-submerged lance. The high-speed camera recording of the model diphase jet leaving the lance is carried out. Then image analysis is performed to estimate real particles motion parameters. Furthermore, the jet cone is analysed to check its character of development and compared with the reported results in the literature. The results are obtained that the particles real velocity is smaller than calculated from typically used formulas. The same with cone angles - it seems to be different than quoted in the literature. Next stage is numerical modelling using AnSys software. The results were compared with the experiments and the model is adjusted. The next stage is ferroalloy "cold" injection and again the computer modelling. The last stage is FeSi injection into grey iron experiments. The analysis of the results is combined both with the laboratory results and modelling then compared with previous data. As a consequence the validated numerical model is obtained which can be helpful for the injection process planning in industrial conditions.
Szapajko G.,Institute of Thermal Technology |
Rusinowski H.,Silesian University of Technology
Acta Montanistica Slovaca | Year: 2010
The diagnostics of the energy conversion systems' operation is realised as a result of collecting, processing, evaluating and analysing the measurement signals. The result of the analysis is the determination of the process state. It requires a usage of the thermal processes models. Construction of the analytical model with the auxiliary empirical functions built-in brings satisfying results. The paper presents theoretical-empirical model of the steam-water cycle. Worked out mathematical simulation model contains partial models of the turbine, the regenerative heat exchangers and the condenser. Statistical verification of the model is presented.
Kostowski W.,Institute of Thermal Technology |
Mendecka B.,Institute of Thermal Technology |
Gorny K.,Institute of Thermal Technology |
Skorek J.,Institute of Thermal Technology |
And 4 more authors.
Proceedings of the 2012 13th International Carpathian Control Conference, ICCC 2012 | Year: 2012
The paper presents the assumptions and the architecture of a multi-layer system for a perimetric protection of an industrial infrastructure object, i.e. the natural gas city gas station. Perimetry, which originally refers to the systematic measurement of human's eye visual system, here is used to describe system capabilities of monitoring a wide-angle visual field located in an industrial object. Such surveillance is aimed at detecting malfunctioning elements, even if their dimensions and contrast are extremely low. In particular, the reported research was focused on detecting gas leakages. The system analyses multimodal image input, acquired from conventional video and IR thermography cameras as well as accounts for information on natural gas flow pattern inside the pipelines. The information is processed and submitted to the natural gas dispatching centre, and the acquired parameters are use to evaluate a level of failure probability. The objective of the system is to support the dispatching centre crew in taking decisions concerning appropriate maintenance or rescue actions. © 2012 IEEE.
Adamczyk W.P.,Institute of Thermal Technology
Archives of Computational Methods in Engineering | Year: 2016
The numerical simulation of the large scale industrial circulating fluidized bed (CFB) boilers, working under air- and oxy-fuel combustion are presented in this paper. Moreover, two-dimensional experimental rig used for numerical model validation is described. For three-dimensional numerical simulations two industrial compact CFB boilers were selected installed in Polish Power Plants. Numerical simulations were carried out using three-dimensional model where the dense particulate transport phenomenon was simultaneously modelled with combustion process. The fluidization process was modelled using the hybrid Euler–Lagrange approach. Within the paper, readers can find information about used computational technique and a number of reference to specific work. The impact of radiative heat transfer on predicted temperature profile within the CFB boiler was investigated in presented work. Moreover, the novel model for retrieving radiative properties of gases under oxy-fuel combustion process was used. The evaluated temperature and pressure profiles during numerical simulations were compared against measured data collected during boiler air-fuel operation. Collected data was also used for validating numerical model of the oxy-fuel combustion model. Stability of the model and its sensitivity on changes of composition of the oxidizer were studied. This simulations were evaluated to check the response of the numerical model on changing the combustion conditions from air- to oxy-fuel combustion process. The comparison of the pressure and temperature profiles for all considered cases gave comparable trends in contrary to measured data. © 2016 The Author(s)
Kostowski W.,Institute of Thermal Technology |
Skorek J.,Institute of Thermal Technology
Proceedings of the 24th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, ECOS 2011 | Year: 2011
The paper discusses chosen issues concerning damaged gas pipelines. Attention is paid to modelling the steady-state flow of natural gas in distribution pipelines, and the most commonly applied models of isothermal and adiabatic flow are evaluated for both the ideal and the real gas properties. A method of accounting for a leakage by means of a reference flow equation with a discharge coefficient is presented, and the dependency of the discharge coefficient on pressure is demonstrated both with literature data and the authors' experimental results. A relevant computational study of a pipeline failure is presented for a high-and a medium pressure pipeline. The importance of an appropriate choice of the flow model (isothermal or adiabatic flow of real or ideal gas) is demonstrated by the results of the study. It is shown that accounting for the variability of the discharge coefficient is required if medium pressure pipelines are analyzed. However, it is eventually shown that the impact of the discharge coefficient on the predicted outflow rate is of lesser importance than that of the applied flow model.
Adamczyk W.,Institute of Thermal Technology |
Kruczek T.,Institute of Thermal Technology |
Bialecki R.,Institute of Thermal Technology
ECCOMAS 2012 - European Congress on Computational Methods in Applied Sciences and Engineering, e-Book Full Papers | Year: 2012
The subject of this paper is a development of a rapid, in-situ method of retrieving the orthotropic heat conductivity. The technique can be seen as an enhancement of the known Parkers flash technique . The presented technique is capable of handling orthotropic media of arbitrary shape, provided the measurement surface is planar and two principal axes of the heat conductivity tensor are in that plane. The need for determining anisotropic conductivity arises when dealing with a certain type of crystalline materials like carbon but also when evaluating the equivalent conductivity of composites. The proposed method uses an infrared camera to record the variation of the temperature field induced by a laser impulse. Both the camera and the laser are located on the same side of the body under investigation.
Przybyla G.,Institute of Thermal Technology |
Szlek A.,Institute of Thermal Technology |
Ziolkowski L.,Institute of Thermal Technology
International Journal of Thermodynamics | Year: 2013
In this paper the results of the experimental study on the SI engine using biogas are presented. The experiments were carried out on a petrol engine with a low engine displacement. Typical SI engine was selected in order to evaluate the potential application of gaseous fuel (i.e. biogas). These types of engines are available on a wide scale and commonly used in automotive sector because of the low purchase price and operating costs. It is expected that after minor modifications, the engine can easily operate in low power co-generation mode. In an experimental part of this paper a complete study of the biogas combustion is presented and compared with the results for natural gas in the same unmodified petrol engine (without modification to its combustion system). The main objective was to compare and evaluate the performance, efficiency, and environmental impact of the engine under lean air/fuel mixture conditions when using alternative fuel, i.e. biogas and natural gas.