Access Restriction

Author Benyó, Imre ♦ Kovács, Jenő ♦ Mononen, Jari ♦ Kortela, Urpo
Source CiteSeerX
Content type Text
File Format PDF
Subject Domain (in DDC) Computer science, information & general works ♦ Data processing & computer science
Subject Keyword Modelling Steam Temperature Dynamic ♦ Surface Area ♦ Non-linear Static Part ♦ Energy Balance ♦ Combustion Chamber ♦ Second Superheater Stage ♦ Validation Result ♦ Bed Boiler ♦ M2 Volume ♦ Fg Flue Gas ♦ Thermal Process ♦ Levenberg-marquadt Method ♦ Miso Wiener-hammerstein Cascade Model ♦ Fg_rad Representative Temperature ♦ Heat Flow ♦ St Steam ♦ Superheater Control ♦ Rad Radiative ♦ Heat Transfer Coefficient ♦ Single Steam Superheater Stage ♦ Linear Part ♦ M3 Specific Heat ♦ Time Dependence ♦ Nomenclature Temperature ♦ Conv Convective
Abstract The paper presents a MISO Wiener-Hammerstein cascade model describing the thermal process of a single steam superheater stage. The non-linear static part is based on the energy balance of the medias involved in the process. The linear part involves the time dependence of the process. The derivative of the model can be easily obtained, which allows applying the Levenberg-Marquadt method for identification. The identification and the validation of the model is presented on the measurement of the second superheater stage of a 180 MW fluidized bed boiler. The proposed model is simple and transparent, its identification is not demanding. According to the validation result, the model is suitable to test superheater control structures on it. Nomenclature T temperature, K A surface area, m2 V volume, m3 m mass, kg ρ density, kg / m3 c specific heat, kJ/(kg·K) h enthalpy, kJ/kg Q heat flow, kJ/s α heat transfer coefficient, kJ/(s·K) indices st steam, fg flue gas, m fg_rad representative temperature of the combustion chamber, m metal of the pipe, in inlet, out outlet, conv convective, rad radiative.
Educational Role Student ♦ Teacher
Age Range above 22 year
Educational Use Research
Education Level UG and PG ♦ Career/Technical Study