Steam boilers basics

• Semester 5, position 4

Reaching the competence and academic skills and methods for it's acquiring. Developing creative capabilities and mastering the specific practical skills. Goals determine the specific results which should be achieved within the subject. Goals also represent basis for control of the achieved results. Activities in this subject are in accordance with basic tasks and goals of the study program.

After successfully completing the course, the students will be able to: • Calculate the material balance of the combustion process and the enthalpies of combustion products for solid fuels. • Choose the excess air and apply flue gases recirculation. • Get to know more about the structure of the irradiated and convective evaporator. • Acquainted with the main superheater types and temperature control systems of a superheated vapor. • Acquainted with the basic types of water heaters and air heaters. • Calculate the heat balance of the steam boiler and its heat surfaces.

Worikng principle of a steam boiler and definitions of basic concepts; Fuels for steam boilers; Combustion material balance; Excess air; Flue gases enthalpy; Steam boiler heat balance, losses and efficiency; Steam boiler furnace; Steam boiler evaporators with natural and forced circulation loop; Half-radiation and convection evaporators; Radiation, half-radiation and convection superheaters; Reheaters; Different types of water heaters; Recuperative air heaters and regenerative air heaters.

Auditory exercises consist from demonstration exercises(classification of boilers; steam boiler construction; main and auxiliary devices and equipment); Сomputational tasks - coal combustion material balance (coal calorific value, theoretical air volume for combustion and theoretical flue gas volume); worikng principle of a industrial steam boiler; wetermining the losses, efficiency and fuel consumption of the given steam boiler; heat and material balance of steam boiler heating surfaces; Instruction for project - calculation of boiler capacity with the selection of the appropriate hot water and steam block boiler; Estimation of average annual consumption of gaseous fuels.

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Handouts which will be at student's disposal a week in advance.

Total assigned hours: 75

New material: 20
Elaboration and examples (recapitulation): 10

Auditory exercises: 0
Laboratory exercises: 0
Calculation tasks: 20
Seminar paper: 0
Project: 10
Consultations: 0
Discussion/workshop: 0
Research study work: 0

Review and grading of calculation tasks: 3
Review and grading of lab reports: 0
Review and grading of seminar papers: 0
Review and grading of the project: 2
Test: 5
Test: 0
Final exam: 5

Activity during lectures: 0
Test/test: 30
Laboratory practice: 0
Calculation tasks: 20
Seminar paper: 0
Project: 10
Final exam: 40
Requirement for taking the exam (required number of points): 30

Lj. Brkic, T. Zivanovic, D. Tucakovic: Steam Boilers, Faculty of Mechanical Engineering, Belgrade, 2010, (In Serbian); Lj. Brkic, T. Zivanovic, D. Tucakovic: Steam Boilers Thermal Calculation, Faculty of Mechanical Engineering, Belgrade, 2010, (In Serbian)