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Dudynski M.,Modern Technologies and Filtration | Dudynski M.,University of Warsaw
Physica A: Statistical Mechanics and its Applications | Year: 2016

We present a new model of the Lorentz gas kinetic equation for a system where the integral collision operator has a spectrum consisting of a continuous and discrete part. The spectral gap between the two kinds of the spectrum is an adjustable parameter of the model. This allows for the analysis of the existence and property of the hydrodynamical eigenstates and the meaning of the Grad's method of moments for the transition between hard and soft interactions. © 2016 Elsevier B.V. All rights reserved. Source

Dudynski M.,Modern Technologies and Filtration | Kwiatkowski K.,University of Warsaw | Kwiatkowski K.,The Interdisciplinary Center | Bajer K.,University of Warsaw | Bajer K.,The Interdisciplinary Center
Waste Management | Year: 2012

The poultry waste produced by industrial slaughterhouses typically contains not only feathers, but also a mixture of animal entrails, nails, blood, beaks and whole carcasses. Economical utilisation of this mixture, varying strongly in composition and moisture content, is, in general, difficult. We demonstrate that this awkward material can be successfully used for gasification in a simple, fixed-bed gasifier. The method of gasification, which we developed, enables control of the gasification process and ensures its stability in the operational regime of a working poultry processing plant. The installation, which has been working in Poland for 2. years, utilises 2. tons of feathers per hour and produces syngas of stable composition and fairly high quality. The syngas is burnt in the combustion chamber adjacent to the gasifier. Heat is recuperated in a boiler producing 3.5. tons per hour of technological steam continuously used for the operation of the slaughterhouse. The whole process complies with the stringent emission standards. In the paper we present the end-use device for feather utilisation and describe the underlying gasification and syngas combustion processes. Key elements of the whole installation are briefly discussed. The environmental impacts of the installation are summarized. © 2011 Elsevier Ltd. Source

Sosnowska M.,Modern Technologies and Filtration | Dudynski M.,Modern Technologies and Filtration | Kardas D.,Szewalski Institute of Fluid Flow Machinery | Klein M.,Szewalski Institute of Fluid Flow Machinery | And 2 more authors.
Fuel Processing Technology | Year: 2015

This paper discusses the problem of fireside deposition observed during industrial gasification of feathers in a 3.5 MWth updraft fixed-bed plant equipped with steam boiler. The research included calculating mass balance of the system and performing an analysis of samples of bottom ash and fireside deposits collected from the plant, including XRF, XRD and melting characteristics. Analysis revealed that the bottom ashes and the fireside deposits, collected from the gasification and combustion chambers, consisted of hydroxyapatite with addition of silica and aluminium compounds, while the deposits collected from the boiler and the economiser were formed out of alkali and alkali earth metal sulphates, present in a form of eutectic systems such as 50CaSO4-30K2SO4-20Na2SO4 and 30K2SO4-40Na2SO4-30ZnSO4. The method of minimising fireside deposition by means of additives was discussed and alternative types of boilers suitable for feather gasification systems were proposed as a result of the study. © 2015 Elsevier B.V. All rights reserved. Source

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