Browse

During the biomass densification can be recognized various technological variables and also material parameters which significantly influences the final solid biofuels quality. The paper deals with the experimental research of the relationship between technological variables and material parameters during densification of acacia wood sawdust. The main goal of presented experimental research is to determine the relationship between compression pressure, pressing temperature and raw material moisture content and par...

The aim of the present work is to develop, substantiate, and study a fundamentally new method of derivation of composite electrolytic films making it possible to control their composition and structure. We assume that, after the termination of the stirring-up of a bath containing the electrolyte-suspension with monodisperse spherical particles of the same density, a uniform sedimentation space is established. The upper boundary of this field will descend with a velocity depending on the dispersity and density of a...

Mass continuity equation along with dynamic equilibrium equation or Darcy equation, and one of the state equation defines the fundamental system of equations which describes the fluid flow, particularly, the gas flow through a porous and permeable formation. Converting the mass continuity equation for single phase fluid into a volumetric equation that can be applied for the entire reservoir or partially, represents the starting point in elaboration of mathematical models for gas well performance evaluation. Mathem...

The paper deals with the study of Powered roof support analysis, taking into account the interaction with surrounding rocks. In this respect, an analytical model of kinematics and load of the shield, a differential model of the shield-rock system equivalent stiffness and a Fuzzy logic based analysis of the parameters variation are presented. In the first two models, the classical approach of shield mechanics, the loading scheme was modified by taking into account the horizontal force acting between the roof and th...

Exploitation of groundwater deposits exerts an influence on the state of the hydrogeological objects and the environment at large. The special study is required for the areas with the limited-use surface water. Province of Kyzylorda is one of such regions in Kazakhstan. Its water supply is mainly realized by use of underground waters of Kyzylzharminski deposit. Methods of mathematical modeling play an important part in the process of studying the hydrogeological objects, which are subject to the effect of high tec...

A mathematical model of the dynamics of pressure swing adsorption (PSA) process during the separation of multicomponent gas mixtures with the aim of producing hydrogen has been developed. The model allows to calculate the profiles of component concentrations (H2, CO2 and CO) and temperature in gas and solid phases, the pressure and velocity of the gas mixture along the height of the adsorbent depending on time. As a result of the computational experiments, the effect of changes in the temperature, composition, and...

The work is devoted to the development of a domestic catalyst of ethylene acetoxylation for the synthesis of vinyl acetate is relevant. Non-stationary process of vinyl acetate synthesis from ethylene, oxygen and acetic acid is being implemented in a tubular reactor by passing the gas mixture of the initial reagents through the catalyst bed. It has been established that using hydrothermal treatment of silica gel in an autoclave at varying temperature and processing time it is possible to obtain the samples with dif...

The problem of visualization of fires is relevant to the design of emergency situation simulators for industrial facilities involving a risk of fire or explosion. The effectiveness of a simulator depends on the accuracy of animation (visualization) used in this simulator. The present paper aims to build a mathematical model of fire spread at industrial facilities with regard to the associated processes of smoke generation, release of toxic combustion products and their influence on physical condition of an individ...