Combustion Conditions And Design Control
Of A Two-stage Pilot Scale Starved Air
Incinerator By CFD
Author(s)
F. Kokalj, N. Samec & L. Škerget
Abstract
Contemporary development of successful incineration devices is based on
computational fluid dynamics (CFD) simulation of reacting flow. Thus, the
appropriate numerical simulation is engaged as a tool to develop new or to
upgrade old incinerators. State-of-the-art commercial software packages enable
reliable and accurate simulation of combustion processes including the ultimate
analysis of the physical complete combustion conditions.
Turbulence, temperature and residence time can be calculated and predicted
by applying various macroscopic empirical fluid flow and combustion models.
Direct accurate insight into processes inside the combustion chamber are
however possible only through the practical CFD application. In our case the
study of achievement difficulties of the complete combustion conditions in a two
stage pilot incinerator has been numerically investigated by applying the CFD
software package CFX 5.6. Initially all available combustion models were
examined and the most appropriate model giving most accurate results chosen
for further numerical investigations. Results obtained by different combustion
models have been compared at different combustion and flow conditions in the
secondary chamber of the two-stage pilot incinerator.
The most suitable combustion model has been used for the ultimate analysis
of the complete combustion conditions considering real boundary condition
values. The influences of the way of secondary and tertiary air inflow, flue gases
mass flow rate and changes of the waste calorific value on the physical complete
combustion conditions (i.e. temperature, residence time and turbulence) have
been investigated.
The original second chamber pilot incinerator design modifications were
submitted. New secondary and tertiary air intake design proposals were made in
accordance with the primary incineration goal of achieving complete combustion
of waste. Modifications are small-scale low cost interventions.
Keywords: numerical simulation, combustion models, reactive flow, waste
incineration, incinerators.
Keywords
numerical simulation, combustion models, reactive flow, waste
incineration, incinerators.
Related Book
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