VOL. 12 issue 3 (2010)
text of each
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All articles have been reviewed by the members of Scientific Board.
of Enthalpy of Formation for
The energy balance equation for chemical reactions need expressing all
energy streams as total enthalpies – physical and chemical. There are
several ways of expressing chemical enthalpies of substances, in most
cases for combustible substances they are calorific values. But when
the combustion process takes place simultaneously with other reaction
the enthalpy of formation of substances should be applied. This
enthalpy is easy to find for substances of known chemical composition
but for non-uniform substances of complicated composition it is
difficult to apply such parameter. In the paper the method of
determining the enthalpy of formation basing on the fuel properties and
ash composition is presented. Some examples for solid fuels (coal,
wood) and for liquid and gas fuels are also presented.
of reburning potential of producer gas from sewage sludge gasification
Reburning potential of gas from sewage sludge gasification process have
been defined. Numerical simulation of co-combustion process of gas from
sewage sludge gasification in coal-fired boiler has been done.
Influence of the reaction between reburning fuel and flue gases from
coal combustion on reduction of NOx emission have been examined.
Methane as a reburning fuel was also examined. The results show the
relationship between the relative amounts of nitric oxide, temperature
T, an air excess ratio λ and reaction time τ.
analysis of the seepage from the
municipal waste dumps during their exploitation
Czop M., Pieniążek K.
Waste dumps are long lasting sources of the pollution for the natural
environment. One of the major problem related to the exploitation of
the waste dump is seepage. Composition of waste dump seepage waters
depends on many factors such as: type of the wastes, age of the
dump, degradation phase, compaction level of the wastes, exploitation
process of the object. The article presents test results of the seepage
which occurs during exploitation of municipal waste dumps located in
the are of Silesian voivodship. Both dumps meet legal requirements and
are considered as clean dumps.
of Combustion Process of Solid
Waste in The Full Scale Incinerator
Jaworski T. J.
The aim of the project was mathematical modeling of combustion process
of solid waste in the chamber of full scale incinerator. The problem
was analyzed from two points of view: first - combustion of waste in
the layer on the grate, and second – combustion of gas phase in the
combustion chamber. The results of analysis of combustion and heat
transfer processes in the waste layer are applied as boundary
conditions for solving the CFD problem in the gas volume. The modeling
was realized with the ANSYS 12.1 code with the assumption of
homogeneous, multi-component and multi-reaction combustion process in
the gas volume of the countercurrent waste incineration chamber. The
results are shown as fields of concentrations of gas components,
temperatures, velocities and densities in the analyzed gas volume.
These results prove good correlation between both applied sub-models.
of waste ion-exchange resins in
coke batteries and its influence on coke quality and texture changes
Wasielewski R., Piechaczek M.
Results of research of waste ion-exchange resins with coal co-coking
industrial tests in a coke battery operating in stamp charge system
have been presented. Tests were carried out in industrial scale
150kg/charge (so-called “box tests”) with the addition of waste in
charge from 1 to 3%. The influence of additive volume ion-exchange
resins on the quality parameters of obtained coke has been
investigated. Tests have been carried out for coking blend designed for
“industrial coke” type production. The improvement in coke strength
parameters in terms of indices M80 and M40 when the share of the ion
resin up to the 3% has been observed. The results indicate that thermal
recycling of waste resins are possible and an acceptable ion-exchange
resins concentration in the charge should not exceed 3%.
– automatic and hand decomposition
Biegańska J., Szmigiel D.
Due to rapid development of market of electronic goods the quantity of
electronic waste is rising as well. Nowadays it is not only the problem
of developed countries but for those countriues it seems to be the most
severe problem. The recovery of materials present is the good solution
due to presence of valuable materials present in e-waste. The recovery
would be better if the efficiency of wasted electronic devices is
higher. This parameter is described in the paper – including hand made
decomposition as well as automatic one of picture tubes.